The process of road construction

2. 1 construction preparation

2. 1. 1 temporary facilities

Construction track: The existing 1# and 2# dam roads in Block B and the open space in front of buildings 6#, 7# and 8# are used as circular tracks to meet the needs of construction and transportation.

Temporary power supply: use the transformer (main box) provided by the general contractor, and set poles and switch boxes every 50m to meet the needs of engineering and domestic electricity.

Temporary water use: according to the principle of proximity, the main pipe DN 100 is buried along the line to ensure water use for construction, production and living.

Living quarters: The completed buildings provided by the general contractor are adopted.

2. 1.2 Laying various crossing pipelines in time to avoid affecting road construction.

2.2 Division of construction period

The roads in Area B are preliminarily divided into three sections: ①3# Dam Road to 1 1# Loujian Road; ② Road from No.2 dam road to 1 1# building; ③ Parking lots on roads between 5 #, 10# and 6#, 7#, 8# and 9#.

2.3 Construction organization

See the construction organization chart for details.

2.4 Construction arrangement

2.4. 1 construction period

The planned construction period is 25 working days, and the project will be started in 200 1 year, 1 month, 1 month,1month, reaching the completion acceptance conditions.

2.4.2 Specific arrangements

Remarks on the earliest commencement date and latest completion date of construction projects

Pay off111

Subgrade leveling11/21/6

12% calcareous soil11/711/0

Spreading and rolling of inorganic binder1111114.

Flat edge stone masonry111511/9.

Asphalt mixture surface am-2511/201/22

AC- 16 1 1/23 1 1/25

2.4.3 Work, materials and machine mobilization plan

100 thick calcareous soil12%165438+10.6 ~ 10 days.

200-thick lime fly ash mixture 165438+ 10/0/~14.

50-thick asphalt macadam am-25165438+1October 20~22.

50-thick asphalt concrete AC-16 (Ⅱ)165438+23 ~ 2510 month

100×200×495 kerb 165438+ 10/5

2.5 time limit for a project guarantee measures

2.5. 1 road engineering should arrange special teams to be responsible for their respective construction tasks. Construction personnel work in two shifts, which increases the workload of night construction under the condition of ensuring quality and safety.

2.5.2 Strengthen the degree of mechanized operation, improve work efficiency and ensure the construction period.

2.5.3 Deploy elite soldiers to form a professional team for pipeline and road construction, carry out construction according to the "project method", carry out labor competition, establish post responsibility system, do a good job in internal economic contracting, and have clear rewards and punishments.

2.5.4 Do a good job in material supply and management.

Strengthen incoming goods and product process inspection to prevent unqualified products from flowing into the construction process, causing rework and delay.

Technicians should put forward the material plan as soon as possible, submit the plan drawings to the manufacturer as soon as possible for the external processing components, and the turnover materials should enter the site in advance to avoid the phenomenon of shutdown and slowdown.

Strengthen ideological and political work, carry forward the style of continuous operations, and adopt advanced and reasonable construction methods to improve production efficiency.

Pay attention to the quality of the project, strictly check the self-inspection, achieve a qualified acceptance, and speed up the construction progress.

3, the construction scheme

3. 1 construction survey

After pile connection, surveyors should check the pile position given by Party A according to the alignment result table, and the inspection results should be consistent with the alignment result table, and carefully check the current ground and current road surface elevation, so as to provide a basis for calculating the excavation amount.

After the site conditions are met, the composite conductor will be laid in the construction area to control all the given pile positions in the whole line, which will provide the basis for the completion survey of various underground pipelines. The traverse shall meet the accuracy requirements of Grade III traverse, and all traverse points shall be located in easy-to-protect zones, reinforced with concrete and protected with fences.

3.2 Road engineering

Road construction should be carried out in sections according to the construction deployment. The pavement structure should be completed below the surface layer first, and then the surface layer should be paved on the whole line after the pavement is fully formed.

3.2. 1 lime soil treatment subgrade (see construction process flow for details)

Lime adopts bagged lime powder. Lime soil must be fully pulverized, stirred on site and spread evenly before use. When paving, leveling shall be carried out by handrails and rolled with 12 ~ 15t. Strength and flatness meet the requirements. The unconfined compressive strength of mixed plain soil and lime should meet the standard, and the color of mixed lime soil is uniform.

When rolling, use 6 ~ 8t roller for initial compaction, and then use 12 ~ 15t roller for rolling until the relative compaction degree reaches 95% (heavy compaction). For the parts around the inspection well that are not easy to be compacted, manual compaction shall be adopted to achieve compactness, and the lime soil layer shall be fenced and watered for maintenance after survival.

3.2.2 Lime, fly ash and sand mixed with crushed stones (see construction technology for details)

After the mixture is transported to the site, the virtual paving thickness is determined by small trial paving, and the error is controlled within the range of 65438 00 mm. The mixture is paved in three layers, and the paving thickness is strictly controlled.

Before construction, the material suppliers shall be audited and reported to the supervision department for review. After the materials arrive at the site, the quality inspection and test shall be conducted in time. After paving, grind it with 8t, and then check it with a 5×5m grid.

Sprinkle water after initial compaction, and then recompress with 12t until the relative compaction degree is 95% (heavy compaction), and the depth of wheel track on the surface is less than 5 mm ... The summer sowing site should be stubble and stubble, watered and rolled.

Before the construction of the mixture layer, the inspection well will lift the shaft to the top elevation of the mixture layer, within the range of 1m around the shaft. After each layer is rolled, the mixture should be dug out, mixed with 3% 425 # cement, backfilled and compacted.

After the mixture is rolled by layers, the fence is closed and water is sprayed for maintenance. Spray a layer of emulsified asphalt binder 24 hours before oil spraying, and the fuel consumption is 1.2kg/m2.

3.2.3 Installation of flat kerb

After rolling the inorganic bonding material, the installation of flat kerbs will begin immediately. Check and accept the finished materials according to the quality standard, trim, tamp and level the foundation according to the elevation, measure the setting-out and elevation piles, the pile spacing in the straight section is10m, the bend is 5m, and the radian of the intersection point is controlled by the center of the circle.

Masonry should start from one end, check the straightness with a 3m ruler, and correct the elevation and plane with a level gauge. The width of kerb and flat stone construction joints is 1cm. After laying for a period of time, jointing should be carried out, and the back should be returned to the soil in time for protection.

3.2.4 Asphalt concrete (see construction technology for details)

Before paving, complete the inspection and acceptance of the previous procedure, cover the manhole with a wooden cover, block the stubble at the intersection with bricks, control the compaction coefficient at 1.2 ~ 1.3, and pave with an automatic leveling paver.

The temperature of on-site factory-mixed asphalt concrete shall be controlled at 120℃ ~ 130℃, and it shall not be lower than 1 10℃ when paving. The initial pressure temperature shall be controlled at 80℃ ~ 100℃, and the pressure shall be stabilized by 8 ~ 10t roller, and the heavy pressure shall be achieved by 15T roller, and the final pressure shall be achieved by 8 ~ 10t roller with smooth wheel tracks. Rolling should start from the side of the road and move to the center of the road. It is not allowed to turn around or turn around on the rolled asphalt concrete layer. The transverse joint adopts "straight stubble hot joint", the lower part of the joint is brushed with a small amount of drained oil, and then compacted with pier hammer after paving, and slag is not allowed on the surface. After survival, take out the cover plate and cover the well circle and manhole cover.

Confirm that the smoothness and elevation of the bottom oil are qualified, and start paving the upper layer after the wellbore is lifted to the design road elevation.

The interval between the upper layer and the bottom layer should not be too long. Spread the whole width with two pavers, and the temperature shall not be lower than 1 10℃. The loose paving coefficient should be determined by trial paving and rolling, and controlled between 1. 15 ~ 1.35.

The initial rolling temperature is 100 ~ 120℃. Roller shall be rolled from the outside to the center, and adjacent rollers shall overlap 1/3 ~ 1/2 wheel width. Finally, the central part of the road is rolled, and the compaction is completed at one time. During initial pressure, the vibration device shall be closed with a 6 ~ 8t double roller for initial pressure twice. When recompressing, use 10 ~ 12t for three rounds of rolling for 2 ~ 4 times. When the asphalt material comes into contact with the roller during rolling, a small amount of water with washing powder can be sprinkled on the roller.

The edges of inspection wells shall be tamped with manual rammer and hot soldering iron.

4. Main construction technical measures

4. 1 Treatment measures for longitudinal joints and construction joints

Longitudinal seam construction: when the edge of the lane under construction has been polluted due to driving or other reasons, it should be repaired. For the collapsed or under-compacted part, it should be removed and chiseled, the joint wall should be vertical and straight, and a thin layer of viscous asphalt should be brushed before paving new materials. Longitudinal grafting should be rolled immediately after paver.

Transverse joint construction: baffle should be used at the joint (the same as the compaction thickness). Make both ends neat, and the repair of transverse joints is the same as that of longitudinal joints.

The upper and lower seams of double layers should be staggered by 20 ~ 30cm.

5, quality assurance system and quality assurance measures

5. 1 quality objectives

5. 1. 1 Project quality: excellent.

5. 1.2 Sub-item quality objectives

The qualified rate of inspection and evaluation of subdivisional work is ≥ 100%.

The excellent rate of subdivisional work is over 90%.

The first pass rate of each process is 100%.

5.2 Quality Assurance System

5.2. 1 Establish and improve the quality assurance system (see the quality assurance system frame diagram for details), clarify the responsibilities of each post, and conscientiously implement the Process Control Procedure and the Inspection and Test Control Procedure.

5.2.2 Management personnel shall supervise, inspect and guide the work, find problems in time and solve them in time, so as to ensure that the first acceptance rate of sectional works reaches 100%, and unqualified works will never be transferred to the next working procedure. Be sure to check the last process, do this process well and serve the next process.

5.3 Quality assurance measures

5.3. 1 The project department shall set up full-time quality inspectors and a number of measurement and testing personnel to be responsible for quality inspection and testing in the construction process.

5.3.2 Implement the model guiding system, organize technical experts to make a model for each working procedure, and conduct comprehensive construction after it is approved by the quality team and the supervisor.

5.3.3 Strictly control the "six customs", that is, joint review of drawings, technical disclosure, construction operation in strict accordance with drawings and standards, and acceptance of various materials and semi-finished products; According to the inspection and evaluation standards, the pre-inspection, hidden inspection and structural quality acceptance are controlled.

5.3.4 Seriously implement the provisions in the project supervision system, and act in strict accordance with the supervision procedures, so that every project can meet the satisfaction of the owner.

5.3.5 Ensure that the purchased materials and engineering materials meet the engineering quality requirements, and the main materials and semi-finished products must be submitted to the owner and supervisor for approval before purchasing. Components, pipes, etc. Must comply with the requirements of the design and management departments, materials entering the site should be inspected and marked, and unqualified materials are strictly prohibited.

5.3.6 Allocate mechanical equipment according to technical specifications, and organize construction in strict accordance with relevant requirements.

5.3.7 Strengthen the control of the construction process, so that the whole process that directly affects the quality in construction production is under control. Adhere to the system of self-inspection, mutual inspection and handover inspection, determine corresponding technical measures and implementation means for special processes, and focus on controlling weak links:

A. The field test and detection of backfill soil should be strengthened, and the thickness of each 20 ~ 25 cm is a layer, which is compacted by layers. Pay attention to control the water content and rolling times to reach the density standard of backfill soil.

B. For various raw materials, such as precast concrete members, commercial concrete, asphalt concrete, lime-fly ash stabilized macadam, etc., confirm the qualification, production capacity and quality level of suppliers, and report to the supervisor for approval, and conduct inspection and test before and after the arrival of the goods according to different materials.

C the first article acceptance system shall be implemented for the parts entrusted for processing, and they shall be accepted together with the supervisor. Only after passing the qualification can mass production be carried out. In the process of mass production, random inspection is carried out at any time to ensure the quality of components.

D all kinds of measuring instruments used in the construction site should be marked and submitted for inspection on time.

6, safety technical measures

6. 1 Establish a sound safety guarantee system, formulate a sound safety management system, and set up a full-time safety supervisor in the project department.

6.2 Adhere to the safety education system for all employees, improve the safety self-protection awareness of construction personnel, and at the same time implement the specific safety production responsibilities to various functional departments, operation teams and even specific people, so as to implement the responsibilities.

6.3 This project will seriously implement Basic Standards for Safety Protection of Construction Sites in Beijing.

6.4 There are many types of work and machinery in this project, and each type of work should hold relevant certificates after passing the training and examination. In the construction process of each type of work, when using and operating various machines (tools), the safety operation procedures of this type of work and this machine should be strictly implemented.

6.6 When each type of work is carried out, there must be someone who is in charge, unified command and mutual cooperation. All operators entering the construction site must wear personal labor protection articles.

6.6 The Project Department shall set up full-time electricity management safety officers, establish and improve the guarantee system, improve the safety management system, and strengthen the temporary electricity safety protection management. Users must wear insulating gloves and shoes. All the electricity used in this project is laid by temporary overhead lines, and the three-phase five-wire system is implemented.

6.7 Organize the construction personnel to seriously study the operating rules of safety production, improve safety awareness, pay close attention to illegal operations, and ensure that each working procedure has safety technical disclosure.

6.8 A safety leading group and a voluntary fire control organization shall be established at the site to be responsible for the safety and security of the site and the fire control organization. The use of naked flame must be approved by the competent personnel and obtain a hot certificate before starting work. No one is allowed to use an open flame without permission. Flammable and explosive articles should be stored separately, away from fire sources to prevent fire. Fire fighting equipment should be checked regularly to ensure sensitivity and effectiveness.

7, civilized construction security and fire management measures

7. 1 A full-time civilized construction and traffic safety management team is set up in this project, which is directly led by the project manager, and a special person is appointed to be responsible for the publicity and management of civilized construction, and cooperate well with other construction units in the factory.

7.2 Define the responsibility areas of various departments, types of work and units of the project department to ensure civilized construction, and the specific responsibilities of dust prevention, noise prevention, spill prevention, environmental sanitation and traffic safety, and implement the responsibilities, personnel and organizations. We should conscientiously implement the Basic Standards for Environmental Protection of Construction Sites in Beijing and the Basic Standards for Management of Construction Sites in Beijing, and strengthen the management of civilized construction on site.

7.3 Cement, lime and other dust-prone raw materials required for this project are all bagged materials, which should be stored in a dry and airtight warehouse or covered tightly with tarpaulins to prevent dust. Lime spread during construction shall be stirred with a blender in time to prevent dust.

7.4 There are a lot of earthwork and other bulk materials transportation in this project, and all kinds of bulk materials vehicles (including cement and lime vehicles in bags) must be sealed to prevent scattering and dust.

7.5 The facility workers and domestic garbage of this project will be kept in centralized storage points, cleaned up and transported regularly, and the construction site will be cleaned by designated personnel to ensure the cleanliness of the site.

7.6 The material stacking area of this project shall be leveled and compacted by special personnel, and all kinds of materials shall be packed neatly and firmly according to the specifications, with obvious signs.

8, environmental protection measures

8. 1 According to the actual situation of this bid section, the project manager has a clear understanding of the work and established a sound environmental protection system. See the attached drawings for details.

8.2 Study and implement national and Beijing environmental protection laws and regulations, strengthen publicity and education, make cadres and workers realize the importance of environmental protection and enhance their consciousness.

8.3 Formulate reward and punishment system, strengthen inspection and supervision, and implement environmental responsibility system. Implement irregular inspection system, and make record analysis.

8.4 Mounds should be stacked stably and neatly, and covered with dense mesh when not in use. Stop earthwork operation when the wind force is above 4.

8.5 In case of unknown pipeline during construction, it should be proved before construction, properly protect all kinds of underground pipelines, ensure the safety of urban public facilities, and take corresponding emergency measures in advance.