Does anyone know? How to write the project construction technical proposal in the bid letter? If you have written one please send it to me, thank you!

1. Design of safety facilities for highway projects 1. Understanding of bidding projects 11. The geographical location, status and role of the project. The Menlou Reservoir Super Bridge project is located 250 meters downstream of the gate of the Menlou Reservoir in the southwest of Fushan District, Yantai City. It belongs to the highway. The bridge has the function of an urban bridge and its geographical location is detailed in the drawings. Fudong Road Project is a key project in Fushan District of Yantai City and an image project of Yantai City. As the planned secondary trunk road of urban roads, Fudong Road is not only the main road connecting Fushan District and Menlou Reservoir, but also a dike road for the improvement and management of Neijia River. Its construction will definitely improve the traffic conditions of residents along the line and provide a good environment for Neijia River. The governance brings good results and drives the rapid development of local economy. Menlou Reservoir is located in the southwest upstream of Fushan District, Yantai City. Baiyang River and its tributaries merge into Menlou Reservoir. The stagnant water in the reservoir is an important water source for Yantai City. The reservoir overflows to form the Qingyang River, which flows into the Yellow Sea from south to north. Fudong Road crosses the gatelou reservoir spillway. As the throat project of Fudong Road, the completion of the Menlou Reservoir Bridge will be of great significance to accelerating the economic development of Fudong District, connecting Fushan District and surrounding areas, and improving the quality of Yantai City. 12 Project starting point and ending point: The Fudong Road route starts at 32 meters north of Liugong Bridge and connects to the end point of the already built Hebin Road. It goes south along the Neijia River bank and crosses the Ring Expressway and crosses the Hecun River. It ends at the gate tower. The total length of the sluice gate route of the east dam of the reservoir is 8.929 kilometers. The total length of the Menlou Reservoir Super Bridge Project is 500.47 meters, starting from the starting point number K8478.634 and ending with the ending point number K8979.104. 13 Tender Contents This survey and design tender consists of one contract section covering the survey and design of the main bridge and approach bridges of the Menlou Reservoir Extra Large Bridge, as well as post-service survey and design, including preliminary survey and design, construction drawing survey and design, and preparation of bill of quantities. 14 Survey and design cycle requirements 141 Preliminary design stage survey and design Submit preliminary design documents to the tenderer within 15 days after winning the contract. 142. Survey and design at construction drawing design stage. Construction drawing design documents and bill of quantities shall be submitted to the tenderer within 45 days after the preliminary design documents are reviewed and approved. 143 Construction site cooperation services: Project construction begins until completion acceptance. 15 Technical Standards Bridge design load City - Class A population 3.5KN/m2 Bridge width 3m sidewalk 20m lane 3m sidewalk 26m full width lane number Two-way four-lane bridge design flood frequency 1/100 Earthquake intensity Ⅵ degree, fortify according to Ⅶ degree The rest of the technology The indicators should comply with the specified values ??of JTG BO1-2003 "Technical Standards for Highway Engineering" issued by the Ministry of Transport. 16 Project Scale The recommended plan includes a north bank approach bridge with 1 unit × 5 holes × 30 meters, a simply supported to continuous small box girder main bridge of 8915589 meters, and a variable cross-section continuous box girder bridge project with a total length of 500.47 meters. 17 Project Features, Difficulties and Key Points Fudong Road also has the flood control and rescue function of Menlou Reservoir, which is of great strategic significance to the development of Fushan District City. The position of this project in the road network is very important. The Fushan District government and the public have high expectations for this project. The unique hydrogeological conditions of the Menlou Reservoir, the large width of the bridge, and the function of an urban bridge are the main features and difficulties of the overall design and bridge type. The key points in the design of this project are the erosion of the pier foundation by water flow during flood discharge and minimizing the project cost. Menlou Reservoir Super Bridge Engineering Design Bidding Document 2 2 Understanding of the construction conditions of the area where the bidding project is located 21 Topography and landforms This section basically follows the west or north bank of the Neijia River from the starting point to Tasizhuang. The terrain is not undulating much and is a typical plain landform. From Tasizhuang to the route The end point has a typical hilly landform with large undulations. The geology along the route is mainly medium to fine sand or machine-ploughed soil. The rock formations in the back section are more exposed and the geological conditions are better. 22 Meteorology The area where the project is located has a warm temperate monsoon continental climate, which is regulated and controlled by the ocean and has obvious climate characteristics such as moderate temperature, humid air, and high rainfall. The climate in this area has four distinct seasons. It is windy and rainless in spring, often with late spring cold and other freezing damage. The evaporation rate is high, and there is no hot and humid summer in summer. It is rainy and concentrated. In autumn, the sky is high and the air is cool. There are occasional autumn droughts or floods in winter. There is no severe cold, rain and snow are scarce.

The temperature difference between day and night is small. The multi-year average temperature is 11.9℃. The maximum temperature is 38.4℃. The extreme minimum temperature is -21.3℃. The annual average precipitation is 606 mm. The annual sunshine time is 2817 hours. The annual frost-free period is 214 days. The maximum frozen soil depth is 46 cm. The annual average wind speed is 4.2m/s. The maximum wind speed is 40m/s. 23 River Channel The planned Menlou Reservoir Extra Large Bridge is located 250 meters downstream of the reservoir gate. The river channel width is approximately 145 meters. After many years of treatment, the main river channel of the river section is basically stable. The embankments on both sides of the river channel are formed with mortar rubble concrete. The distance between the embankments on both sides is about 150 meters, the width of the main trough is generally 5080 meters, the width of the beach is 70100 meters, and the vertical ratio of the river channel is about 0.663. The water level of the gate tower reservoir is 33.46 meters, and the maximum water release volume is 5397m3/s. The total gate width is 136.5 meters and the net width of the gate is 120 meters. 24 Requirements for bridge span for reservoir flood discharge: The main span of the bridge shall not be less than 155 meters. 25 Geology This area belongs to the Jiaodong uplift area in terms of geotectonic structure and is located at the northern edge of the sub-unit Jiaobei uplift. Located on the east wing of the Gangyu-1 paleo-present syncline, the syncline is mainly composed of soft mica schist of the Fenzishan Group. The Taocun-Dongdoushan fault passes through the Chujia area of ??Laishan, 10 kilometers southeast of this area, and flows northeast into the Yellow Sea. On the north side of Zhifu Island, there is a northwest-to-Yantai-Penglai North fault passing through it. There are no large active fault structures in the project area. According to the drilling results, the stratum of the site where the bridge is located is mainly composed of plain fill soil, medium coarse sand, sub-clay, sub-sand soil, residual soil, and marble. The maximum drilling depth is 40 meters. 26 Earthquakes According to the "China Earthquake Parameter Zoning Map" GBl8306-2001, the peak earthquake acceleration is 0.10g. The characteristic period of the site's earthquake reflection spectrum is 0.40S. The corresponding basic earthquake intensity is Ⅶ degree, which belongs to the first group of design earthquakes. 27 Building materials 1. Stone Basalt produced in the east of Menlou Reservoir, Menlou Town, Fushan District has abundant reserves and can be purchased or mined by yourself. High-quality granite produced in Daliuhang Village, Daliuhang Town, Fushan District is a good protective engineering material. Asphalt for pavement can be purchased from Rizhao. Other wood and steel materials can be purchased from Rizhao. , cement, etc. can be purchased locally. 2. The area that the roadbed filling route passes through is mostly machine-ploughed land with mixed fill on the surface and medium-fine sand underneath. This route requires less excavation and more filling. During construction, another borrow pit should be established as the roadbed filling site. The high-filling road section should Priority is given to using stone for filling to ensure the stability of the high-fill roadbed. 3. When the rivers and ditches along the hydropower line are dry, it may be more convenient to negotiate with the local government and use local wells or ponds to connect power lines to the nearest location. 28 Social environment Governments, leaders and people at all levels in Fushan District are paying special attention to this project and hope that it will be completed as soon as possible to promote economic development. Therefore, they are very supportive of this project. 3 Overall Design Idea 31 Overall Design Concept A Follow the design principles of safety, applicability, economy, beauty and environmental protection to build the Menlou Reservoir Bridge into a classic building that is durable, suitable for environmental protection and harmonious with the environment, fully displaying the artistic beauty of the bridge. B. Strengthen the investigation of construction conditions through multiple program comparisons and necessary scientific experiments, and study the rational use of design parameters to minimize project costs. C attaches great importance to environmental protection and the overall landscape design plan, bridge type plan, and landscape design plan. In addition to the inspection of renderings, the animation experience is also required to conceive the bridge as a model of the harmonious unity of man and nature. D Adhere to the people-oriented and vehicle-oriented design concept and absorb the experience and lessons learned from the use and maintenance of previous bridges. E Enhance durability design by comprehensively considering various factors within the design reference period. F Increase investment in science and technology, improve scientific and technological content, and make theoretical analysis work deeper and more detailed. G pays attention to details and integrates scheme conception and detailed design to create high-quality projects. 32 Bridge location The bridge location of this project meets the current layout and planning of the urban road network, conforms to the overall direction of the route, and meets the requirements for flood discharge from the Gate Tower Reservoir. The river regime and water flow stabilization are completed. After the embankment project is completed, the impact on the river will be small. The embankment spacing is narrow and the project cost is low. 33 Route Design 331 Plane In order to make the main bridge piers adapt to the direction of the water flow and reduce the impact of the bridge on the water potential during flood discharge, the bridge axis should be as perpendicular to the center line of the river flow as possible and take into account the large stress and complexity of the main bridge span to ensure safety and reduce construction costs. Difficulty In the plane design of the main bridge, the remaining parts within the straight line range should be set up with corresponding curves and flat curves according to the route direction, and the minimum radius of the flat curve should not be less than 2500 meters.

332 Longitudinal section takes into account the characteristics of this bridge with both motor vehicles, pedestrians and non-motor vehicles. According to the previous highway operation experience, the maximum longitudinal slope is controlled to be no more than 2.5 in the longitudinal section design. The radius of the convex vertical curve is not less than 4500 meters. The radius of the concave vertical curve is not less than 4500 meters. Less than 3000 meters. The vertical control elevation points of this bridge are three main river channels, the starting point of the bridge, and the end point of the bridge. The control elevation of the main river channel is the highest flood level and the safe value of the clearance under the bridge. The building height includes bridge deck paving and cross slope. The visual effect of using perspective drawings to inspect the horizontal and vertical combinations is good. 333 cross section In order to ensure smooth drainage and rapid bridge deck cross slope, the cross slope of the bridge deck is designed to be 2. Since the radius of the flat curves is not less than 2500 meters, there is no superelevation along the entire line. 34 Bridge Plan Design Principles The overall harmony is appropriate, the plane is smooth, the vertical section is balanced, and the horizontal and vertical coordination is good. The main bridge is safe, reliable, economical and applicable. The technology is advanced, mature, beautiful and elegant. The approach bridge is economical, reasonable and durable. The distance between the embankments on both sides of the bridge is about 150 meters. The width of the main trough is generally 5080 meters. The width of the beach is 70100 meters. According to the requirements of the water conservancy department, the main span of the bridge should not be less than 155 meters. According to the requirements of the water conservancy department for bridge construction and the characteristics of this project, multiple options were compared and selected during the plan conception stage. After multi-angle economic and technical comparison, two plans were finally determined for economic and technical comparison at the same depth. One is the prestressed concrete continuous beam plan and the other is the low tower cable-stayed bridge plan. 341 Continuous beam plan A Bridge span layout North bank approach bridge 1 unit × 5 holes × 30 meters Simply supported to continuous small box girder main bridge 8915589 meters variable cross-section continuous box girder B Main bridge structural design Main girder is divided into two parts laterally to build a two-part bridge Leave a 1cm gap between them and fill them. Since the cross-section of the bridge’s relatively wide box girder has various types such as single box and single chamber, single box and double chamber, etc., the selection of the cross-section type should be comprehensively considered based on factors such as the box girder aspect ratio, pier type, construction, cost, and landscape, etc., based on the actual situation of the project. It is determined that the main beam adopts a single-box single-chamber cross-section. The main beam adopts horizontal, longitudinal and vertical prestressed box beams. The top plate of the box beam is 13 meters wide. The fulcrum beam is 9 meters high. The mid-span beam is 3.5 meters high. The lower edge of the beam changes according to a 1.6 parabola. The gate tower reservoir The design and bidding documents for the super-large bridge project are 4. The top supports of the bridge piers are thin-walled and the foundation of the bridge piers is made of bored piles and capping platforms. C. Structural design of the approach bridge. In order to make the appearance of the whole bridge coordinated and from the perspective of economy and construction convenience, the approach bridge adopts a 30-meter simply supported to continuous small box girder with a beam height of 1.6 meters and a top plate of the box girder with a total width of 13 meters. The height of the bridge head connected to the roadbed using pile-type bridge piers is controlled at about 6 meters. The bridge abutment adopts pile-type abutments. D Construction organization According to the characteristics of the river and the actual situation of the bridge location, it is recommended to adopt the hanging basket suspension pouring scheme for the main beam construction of the main bridge and the main beam of the approach bridge to be constructed by prefabricated hoisting. This plan meets the requirements of the water conservancy department for crossing the river channel. Structural rigidity, smooth and comfortable driving, low maintenance workload, mature design and construction technology, low cost, main beam appearance changes, soothing rhythm, high span proportion of the bridge, appropriate coordination with the surrounding environment. 342 Short tower cable-stayed bridge plan A Bridge span layout North bank approach bridge 1 unit It is a double tower with a single cable plane. Since the bridge towers occupy the width of the bridge, the width of the bridge in this plan is 28 meters. Since the cross-section of the bridge is relatively wide, there are single-box, multi-chamber, multi-box and other types. Considering that the bridge towers and cables are arranged at the center line of the bridge, the cross-section type adopts a single-box, three-chamber cross-section. The top plate width of the box girder is 28 meters, and the beam at the fulcrum of the mid-pier is used. The lower edge of the 5-meter-high mid-span beam and the 3-meter-high beam changes according to a parabola of 1.6 times. The main beam adopts horizontal, longitudinal and vertical prestressed box beams with an upper cable distance of 4 meters. The bridge tower and the main beam are consolidated into a rectangular solid section with a width of 2 meters across the bridge and 4 meters along the bridge. The cable distance on the tower is 1.5 meters. The stay cables use parallel steel wire bundle anchors as cold-cast heading anchors to be symmetrically anchored on both sides of the beam body and stretched within the box girder. The bridge pier adopts a three-column pier top and has three supports in the transverse direction of the bridge. The foundation adopts bored piles and a supporting platform. C. Approach Bridge Structural Design Since the width of the main bridge in this scheme is widened to 28 meters, the width of the approach bridge is connected with the main bridge and the full width is also increased to 28 meters. The structural design of the approach bridge is basically the same as the approach bridge in Scheme 1 and will not be discussed again. D. Construction organization It is recommended to use the hanging basket suspension pouring scheme for the construction of the main beams of the main bridge. The main beams of the approach bridge should be constructed by prefabricated hoisting.

This plan meets the water conservancy department’s requirements for crossing the river channel. It has a larger structure, a smoother and more comfortable ride, and better landscape effects. However, the later maintenance work is larger and the cost is higher than Plan 1. Because the bridge deck is wider and the lateral stress is greater, the cracks in the main beam are more difficult to control and the durability is slightly lower. 343 Plan Comparison Project Continuous Beam Plan Low Tower Cable-Stayed Bridge Plan Main Bridge Span Combination m 8915589333 8915589333 Full Bridge Construction and Installation Cost Yuan Main Bridge Construction and Installation Cost Yuan Main Bridge Indicator Unit/m2 Technology Maturity Mature Larger spans Less experience to draw from Difficulty level of construction is generally average, the amount of post-maintenance work is small, the landscape effect is better, slightly better, the project cost is low, and the construction cost is relatively high. Recommendations Recommendations Recommendations Comparison Based on the above factors, the continuous beam scheme is the recommended scheme. 344 Other structures A Bridge deck pavement Based on the experience of highway construction in Yantai City, it is recommended to use SMA asphalt mixture with a thickness of 4 cm in the upper layer and medium-grained asphalt concrete with a thickness of 6 cm in the lower layer. B. Bridge deck drainage: The bridge deck is designed with 2 transverse slopes and the longitudinal slope of the bridge is not less than 0.5 so that rainwater on the bridge deck can be quickly drained. Drainage pipes are set on the inside of the sidewalk with a spacing of 5 meters along the bridge direction. C. Expansion joints. The expansion joints are steel expansion joints. Since the long expansion joint of the bridge in this project has a large difference in deflection deformation at the beam ends on both sides, it is recommended to use high-quality expansion joints. D Bearing For the larger tonnage of the main bridge bearing, it is recommended to use spherical steel bearings. For the approach bridge, basin-type rubber bearings are preferred and dust-proof measures should be adopted to protect the bearings and extend their service life. E Safety facilities: To ensure safety, a double yellow solid line is set up in the center of the road bridge and a steel guardrail is set on the inside of the sidewalk and a stainless steel railing is set on the outside. F Lighting poles Consider the characteristics of urban bridges and set up diffuse lighting on the bridge. 345 Design Calculation Calculations were performed based on the proposed bridge plan. The calculation content and software used are shown in the table below. Calculation content uses the software Global Static Calculation Plane Finite Element Bridge Doctor, Bridge Comprehensive Program GQJS Global Static Calculation Space Finite Element ANSYS, MIDAS Global Dynamic Calculation Dynamic Characteristics, Seismic Calculation ANSYS, MIDAS Local Calculation of Continuous Beam Pier Top 0 Block, Cap The calculation results of ANSYS, MIDAS and other corresponding professional software for wind resistance, lower part, foundation and other calculations show that the proposed bridge structure meets the specification requirements. 35 Durability design The durability design of this project is planned to start from the following aspects: A. Concrete structure protection uses high-performance concrete with high strength, high density, good impermeability, and small shrinkage and creep. Effective measures are taken to reduce concrete temperature cracks. Appropriate heating A large concrete protective layer is combined with the landscape design to coat the outer surface of the concrete to prevent moisture and harmful gases from entering. Bearing B uses a spherical steel bearing or a pot-type rubber bearing with good durability, and a protective cover is set outside the bearing to prevent moisture, harmful gases and dust pollution. C Strengthen drainage design and take reliable measures to prevent bridge deck water seepage. Design appropriate bridge deck horizontal and vertical slopes. Appropriately increase the aperture and number of drainage pipes to allow bridge deck water to drain quickly. The ends of the bridge expansion joints are tilted to prevent bridge deck drainage from leaking onto the main beams and beams. On the bridge pier. D. When designing the main bridge structure, full consideration is given to the inspection, repair, and replacement of components. Sufficient space is left in the box-shaped concrete components, and all box-shaped sections are accessible for easy maintenance. When designing the bridge pier, a structure is reserved for lifting the main beam and replacing the support. E Establish a maintenance management system to improve the level of maintenance management. 36 Environmentally friendly design A controls the maximum longitudinal slope to no more than 2.5. The bridge head height is controlled to about 6 meters. Although the length of the bridge is long, the one-time investment is large, but the length of the roadbed is short, which reduces the land occupation and soil use. The smaller longitudinal slope greatly reduces the pollution from automobile exhaust. degree. The subgrade of the B road section uses mortar masonry stone arch protection arch rings to plant grass on the one hand to protect the subgrade and on the other hand to green the environment and conserve water and soil. C Try to use engineering spoils and residues so as not to occupy cultivated land. D The construction process requires the construction unit to take measures to prevent dust, asphalt smoke, and drilling mud pollution. 37 Safety Facilities Design Plan The safety facilities of this project are designed based on relevant national and ministerial standards and combined with the road, traffic and environmental construction conditions of the project to set up relatively complete traffic signs, markings, guardrails and other traffic safety facilities. 371 Logo The logo layout content uses Chinese and English secondary high-strength reflective film.

The structural support method is based on the vehicle model composition, sign layout size and sign layout position, with the goal of reducing the cost and improving the landscape effect while ensuring structural safety. In addition to setting up corresponding warnings, prohibitions, instructions, directions and other signs in accordance with the specification requirements, the layout of signs should also reflect humanized design and replace text with humanized patterns to increase visual recognition. 372 Marking lines The marking lines are made of hot-melt reflective paint. According to the specification requirements, complete road markings should be set up on standard road sections and equipped with directional reflective raised road signs and guide arrows. 373 Guardrails and railings To ensure safety, a double yellow solid line is set up in the center of the road bridge and a steel guardrail is set up on the inside of the sidewalk and a stainless steel guardrail is set on the outside. Menlou Reservoir Extra Large Bridge Engineering Design Tender Document 6 38 Engineering Measurement Develop a detailed preliminary design measurement and construction drawing measurement plan according to the specification requirements and the situation of this project. Before the initial survey, go to the surveying and mapping department to purchase the latest 110,000 and 150,000 topographic maps, repeatedly optimize the bridge position on the topographic map, conduct on-site surveys and compare to determine the best solution. When measuring construction drawings, the deployed GPS control points, conductor points, and leveling points are used for control measurement. Cross-river leveling measurement is controlled according to the third level. 39 Engineering Survey: Use a combination of excavation, drilling, and geophysical prospecting to survey, sample, and analyze structural geology to provide detailed and reliable geological data in a timely manner. Its main content includes identifying the topography, landforms, geological structures, unfavorable geological phenomena and distribution of the bridge area, the spatial distribution and physical and mechanical properties of each rock and soil layer within the exploration depth, the allowable bearing capacity and frictional resistance of each natural soil layer, and conducting environmental engineering geology in the bridge area. The evaluation proposes prevention and monitoring measures to identify the burial conditions of groundwater. The corrosiveness of groundwater to concrete and steel structures is analyzed. The stability of the site soil, seismic effects and the presence of liquefied soil layers are analyzed. The strength, uniformity and deformation of the foundation soil are evaluated. Make an evaluation. Strive to have complete survey data and reasonable design parameter values ??to ensure the safety and reliability of the bridge and to minimize the project cost. 4 Preliminary estimation of project cost 41 Preparation basis A Ministry of Communications Jiaotong Highway Document No. 1996611 "Methods for Preparation of Investment Estimation of Highway Capital Construction Projects" and "Estimation Indicators of Highway Projects". B Document No. 1996612 issued by the Ministry of Communications and Highways, "Estimate Estimates and Budget Preparation Methods for Highway Capital Construction Projects". C. Document No. 199265 issued by the Ministry of Communications, "Highway Project Budget Quota" and "Highway Project Budget Quota". D. Document No. 1996610 issued by the Ministry of Communications and Highways "Highway Engineering Machinery Shift Fee Quota". E Shandong Provincial Department of Communications Lujiaoji Document No. 199717 "Shandong Province's Implementation of Supplementary Regulations of the Ministry of Communications". F According to the relevant documents of the State Planning Commission, the Ministry of Construction, and Shandong Province. G Jiao Highway Fa No. 2005230 "Notice on Improving the Relevant Contents of the Budget Preparation Methods for Highway Capital Construction Project Estimates". 42 Fee Collection Standard A The unit price of materials is based on the current market price for ease of comparison. B. The road maintenance fees and vehicle and vessel use tax in the mechanical platform class are based on the "Notice on Adjusting the Collection Standards of Road Maintenance Fees for Cars and Motorcycles" issued by the Shandong Provincial Department of Transportation, the Shandong Provincial Department of Finance, and the Shandong Provincial Price Bureau on June 20, 1994 and the Shandong Provincial Department of Transportation and Shandong Provincial Price Bureau. Zhengfa No. 199671 "Notice of the Shandong Provincial People's Government on Collection of Road and Port Construction Fees" is implemented. C. Engineering survey and design fees are calculated in accordance with the 2002 revision of the "Engineering Survey and Design Fee Standards" of the State Planning Commission and the Ministry of Construction. Experimental research fees are calculated with reference to similar scientific research projects. D. Other direct costs, indirect costs and other fee collection standards are in accordance with the "Preparation Methods" and "Supplementary Regulations" promulgated by the Ministry of Communications. 43 Summary of project cost estimation The total estimated investment amount of the proposed project recommended plan is RMB XXXXX, including the loan interest during the construction period, including A. Construction and installation fee XXXXX yuan B. Equipment purchase fee XXXXX yuan C. Other project construction costs XXXXX yuan D. Preparation fee XXXXX yuan. 5 Characteristics of Bidding Project Design and Countermeasures to Key Technical Issues 51 Characteristics of Bidding Project Design 511 The bridge has a large width and is subject to complex lateral forces. For this reason, the design adopts split construction and uses partitions in the middle to disconnect and apply lateral prestressing to the main bridge. The large-scale spatial finite element software ANSYS performs spatial calculations and combines the model test results to take reliable measures to effectively avoid concrete cracks caused by the large width of the bridge.

512 This project has the functions of both a highway and an urban bridge. This project is a two-way four-lane road with a 3-meter sidewalk. The characteristics of non-motorized vehicles and pedestrians were considered during the design. The longitudinal slope of the bridge should not exceed 2.5, which fully reflects the guiding ideology of people-oriented and vehicle-oriented. Menlou Reservoir Super Bridge Engineering Design Bidding Document 7 52 Key technical issues in bidding project design and their countermeasures 521 Doing a good job in overall design is the key to the success of this project design Fully understand the project characteristics and construction conditions Appropriate mastery of technical indicators Do not blindly pursue high standards Achieve balanced indicators and carry out multi-level and multi-faceted comparison and optimization of plans to ensure the safety, economy and comfort of the bridge. The design of the 522 bridge type scheme is the focus and difficulty of the design of this project. The bridge type scheme plays a key role in the use function, landscape effect, project cost, maintenance, management, environmental protection, etc. of the entire project. It is the core issue in the design of the entire project. It is planned to fully study the project characteristics and construction conditions, draw up as many bridge type plans and combinations that meet the conditions as possible, conduct equally in-depth economic and technical comparisons, and extensively invite domestic and foreign experts, scholars, and construction parties to provide opinions and suggestions to finalize the bridge type plan. 523 Structural analysis is another focus and difficulty in the design. In recent years, a large number of continuous beam continuous rigid frame bridges have been built in China, and a lot of successful experience has been accumulated. However, many problems have also been exposed, especially cracks in concrete and mid-span deflection problems, which are common and Serious. In this project, the main bridge adopts variable-section prestressed concrete continuous beams. How to effectively avoid the occurrence of cracks is one of the key points and difficulties of this project. The design intends to fully absorb the experience of previous similar bridge construction and related scientific research results, and use space software analysis to simulate and calculate the various complex environmental factors that the structure will bear. Based on the calculation results, reliable measures will be taken to avoid the occurrence of cracks and mid-span construction. Scratch down. 524 Minimizing the project cost is the focus of the design of this project. In view of the nature of the investment entity of this project, measures should be taken to not only improve the performance but also reduce the initial construction funds and later management and maintenance investment. Based on the characteristics of the project, it is recommended that the main bridge adopt a technically mature continuous girder bridge construction cost that will save the lowest post-maintenance costs. Whether the basic data is complete and accurate will directly affect the rationality of the design plan. In the next step, great attention should be paid to the collection of basic data to avoid design changes caused by incomplete and inaccurate basic data, thereby increasing project investment. In terms of design services, we provide tracking services and implement dynamic design to handle new situations that arise during the construction process in a timely manner to avoid project waste. 6 Necessary drawings The drawings are attached.