Introduction to the model construction scheme of the fence?

how to write the construction plan of the fence? What is included in the construction plan? The following is a detailed introduction of the content of the model construction scheme of the fence brought by the construction network for reference.

construction plan

1. It is determined that the brick wrought iron fence should be constructed first, and then the temporary colored steel fence should be constructed: after the previous unit is constructed separately, the next construction unit will be started immediately, and the construction waste will be cleaned up. Vehicles will be organized to transport the waste out of the factory immediately, followed by technicians to pay off and level it, and the wall body will be positioned, followed by masonry works.

2. Structural construction: steel bars are processed centrally and bound in situ, and the formwork is made of bamboo veneer and supported by wood. The concrete is mixed on site, and transported to the site by a dump truck for pouring.

3. time plan: the construction period is 6 days.

construction preparation

1. Measure the setting-out, and determine the position of the project according to the axis position and elevation of the original fence.

2. Organize study, be familiar with the construction drawings, understand the design intent, and do a good job in design disclosure and the blue prints.the design.

3. Organize training and study for construction technicians and operators, and make classified disclosure.

4. Prepare the detailed rules for the implementation of construction progress control, decompose the project progress control objectives, clarify their respective responsibilities and ensure the construction period.

5. Prepare detailed rules for the implementation of engineering quality, determine quality control points, decompose construction quality objectives, establish a construction quality assurance system, and prepare work instructions for special parts such as measuring and setting out.

main project construction methods and technical measures

1. foundation engineering

1. construction technology

site leveling → positioning and setting out → foundation trench excavation → formwork erection → concrete strip foundation pouring → inspection and acceptance → formwork removal → backfill soil → moistureproof layer → foundation structure acceptance.

① Among them, the earthwork excavation process is as follows:

Positioning measurement-embedding axis pile-spreading out excavation line-manual excavation-foundation trench inspection-foundation abnormality treatment-entering the next process.

2. Key points of construction

1) During earthwork excavation, the earth volume shall be piled up nearby the site for backfilling.

2) During excavation, surveyors shall level off at any time and nail elevation control piles on the pit wall, so as to grasp the excavation depth at any time and prevent over-excavation.

3) When digging, the distribution of underground pipelines should be ascertained in advance and properly handled.

4) During earthwork construction, attention should be paid to the safe use of construction machinery, and maintenance should be carried out before entering the site. During excavation, no other operations are allowed within the working scope of the excavator. When loading soil, the driver of the car should leave the cab, and it is forbidden to load soil when there are people in the trunk.

② this project is C2 concrete.

after the foundation axis size and basement elevation are accepted and qualified, the measuring and setting personnel shall mark the elevation control line of 4mm thick concrete epithelium in time. Before concrete pouring, check whether the size and shape of cushion are correct and whether the formwork support is firm. When pouring cushion concrete, assign personnel to randomly check the quality of commercial concrete at any time. The concrete surface shall be leveled with a scraping rod, and then rubbed with a wooden trowel for calendering. During the construction, samples shall be taken in time and test blocks shall be reserved.

③ Earthwork Backfilling

After the foundation project is completed, it will be backfilled after passing the acceptance by the quality inspection station.

1) Process flow

Grassroots cleaning → soil quality inspection → layered soil spreading, harrowing → tamping and compaction → compactness inspection → trimming and leveling → acceptance.

2) construction method

before filling, the garbage and other sundries at the bottom of the foundation trench should be cleaned up. Before backfilling the foundation, it must be cleared to the elevation of the bottom surface of the foundation, and the loose garbage, mortar, stones and other sundries will be removed.

check whether there are sundries in the backfill soil, whether the particle size meets the requirements, and whether the water content is within the control range. If the water content is high, measures such as scarifying, airing and evenly mixing dry soil can be adopted; In case of low water content of backfill soil, measures such as watering and wetting in advance can be adopted.

after the filling is completed, the surface shall be leveled by pulling wires, and the places exceeding the design elevation shall be leveled according to the lines in time, and the places below the design elevation shall be filled with soil and compacted.

3) Quality standard

Main control project: the allowable value of elevation deviation is-－3mm, and the layered compaction coefficient meets the design requirements.

general project: the backfilled soil materials must conform to the design or construction specifications, and the layered thickness and water content shall conform to the design or construction specifications, and the allowable deviation of surface flatness shall not be greater than 2mm.

Second, the fence project

Pay-off → formwork support → Cast-in-place concrete base → Maintenance, formwork removal → Brick laying column → Installation and fixation of wrought iron railings

(1) Foundation cushion concrete

During foundation concrete construction, the concrete cushion and surface must be cleaned, without water and soil falling into the groove. When the side formwork is supported on the foundation pit wall, attention should be paid to the stability of reinforcement, and the formwork must not be placed. The formwork of foundation beam can be reinforced by diagonal bracing and opposite bracing, and the width of bayonet reinforcement or angle steel specially made at the upper mouth of beam body should be limited.

when foundation concrete is poured, no construction joints will be retained.

(2) Brick foundation

Before the brick foundation construction, when backfilling the foundation beam side, soil should be avoided to be scattered on the foundation beam. If there is any, the upper mouth of the foundation beam should be cleaned, the center line and sideline of the brick foundation should be popped up, a layer of cement mortar should be spread, and the local unevenness of the upper mouth wall of the foundation beam should be leveled, and then the wall should be paved with bricks. It is also possible to fill the soil after the brick foundation is laid, so as to keep the original concrete surface clean in the brick foundation laying stage and further ensure the laying quality.

III. Main structure engineering

1. Wall engineering

Masonry materials for this project:

Bricks for wall: Masonry materials:

MU1 cement is used for concreting, M7.5 cement mortar is used for masonry, and off-white cultural stone is pasted outside

(1) Materials used for masonry engineering must be tested before use, and unqualified materials are strictly prohibited.

(2) Masonry mortar: the variety and label of mortar must meet the design requirements. Yellow sand must not contain impurities. Tap water should be used, and the impurity content of yellow sand should be controlled below 3%.

(3) Construction preparation: Before laying, the brick or block must be soaked with water, but it must not be too wet or uneven.

(4) before laying, the mortar sundries on the surface of the grass-roots unit must be cleaned up, watered and wetted, and placed at the same time; Before laying, the pipeline and embedded parts at the mouth of the cave shall be reserved according to the design requirements of drawings.

(5) We should operate in strict accordance with the construction specifications of brick masonry, calculate the skin number and mortar joint thickness of this layer of brick according to the height of the floor, window sill and window top, pop up the axis of the wall body at the construction site, set up a number of skin rods, and control the mortar joint thickness to control the masonry height, and use seven-divided bricks or small-sized blocks to cooperate with the whole brick to build corners and wall ends, so as to achieve the purpose of staggered joints.

(6) When masonry meets the mortar joint, the surface of the mortar joint must be cleaned, watered and wetted, and filled with mortar to keep the mortar joint straight.

(7) When repairing the wall, check the corrosion of Rachel reinforcement. If the corrosion is serious, it must be derusted with tools such as wire brush before building is concealed.

(8) Make mortar test blocks according to the specification requirements and test them on schedule.

(9) The internal and external scaffolding adopts mobile temporary scaffolding.

construction points:

before installing the wrought iron fence, make sure that the concrete bearing is formed, whether the position of the embedded parts is correct, and pay attention to the finished wrought iron during transportation, so as not to forcibly deform and distort it. When installing, it should be placed on the axis and fixed firmly.

2, reinforcement engineering

1.2.1 reinforcement processing

A, reinforcement is intensively processed in the on-site reinforcement workshop (see the general layout of construction), and attention should be paid to the correct shape of reinforcement when making it, and there is no warping unevenness on the plane; The clearance of the hook at the end of the steel bar is not less than 2.5 times the diameter of the steel bar; There must be no cracks at the bending point of steel bar, so the steel bar above Grade II cannot be bent over and then bent back; The allowable deviation after reinforcement processing and molding is: ±1±5mm, and the stirrup side length is 5 mm.

B, each batch of incoming steel shall be tested for mechanical properties according to regulations, and can be processed and bound only after passing the test. The inspection must witness the sampling, otherwise it cannot be used as the inspection specimen. To approach and make good molding steel bar must be listed and piled up according to specifications and parts. Reinforced piles should be padded to prevent corrosion.

B, steel bar connection adopts binding connection,

C, 8.1.3.2 should be prepared before binding, that is, the bill of materials should be used to check whether the finished steel bar is consistent with the bill of materials; Prepare the required reinforcement pads; Draw the rebar position line at the binding site.

B, when binding raft foundation reinforcement, the intersection of upper and lower layers of reinforcement should be fastened at every point. When binding, attention should be paid to the wire buckles at the adjacent binding points in a figure of eight to avoid the mesh being skewed and deformed. The upper reinforcement of raft foundation is supported by reinforced horse stool.

C, reinforced protective layer is guaranteed by using 1: 1 cement mortar to make pads. The thickness of the pad should be consistent with the required size of the protective layer.

3 Formwork

Shaped composite steel formwork shall be used, and the formwork shall have sufficient strength and rigidity. After entering the factory, the formwork shall be neatly stacked according to specifications and models, and the stacking height shall not exceed 1.5m.

the template should be cleaned and leveled before use, and the release agent should be brushed, and it should be piled up to the designated place in time after form removal.

if the formwork installation fails to catch up with the modulus, a small number of wooden patterns should be provided, and the surface of the wooden pattern should be shaved, and the connection between steel and wooden patterns should be firm and smooth to prevent the convex-concave phenomenon after the concrete construction is completed.

after the formwork is installed, it is necessary to align the casting points, ensure the accuracy of the formwork position, verticality and surface smoothness, and make sure that there is no problem and fix it in time (by pulling the top to ensure it).

formwork removal time, side formwork concrete strength can ensure that the components are not deformed and the edges and corners are complete, and the internal formwork with reserved holes can be removed only after the concrete strength can ensure that the components and the surfaces of the holes do not collapse and crack; The form removal time of the bearing template should be strictly controlled according to the specification requirements.

4 concrete engineering

1.4.1 concrete supply

A JGZ35 concrete mixer is set up at the site for mixing, and it is transported to the pouring site by a motor dump truck.

1.4.2 pouring and vibrating of concrete

foundation concrete is poured at one time without construction joints. During construction, attention should be paid to the pouring speed and thickness.

when vibrating concrete, the vibrating duration of each vibrating point should make the concrete surface appear laitance and no bubbles. When using plug-in vibrator, collision with steel bars, templates, etc. should be avoided; The depth of the vibrator inserted into the lower concrete shall be not less than 5 mm. When a surface vibrator is used, its moving distance should ensure that the flat plate of the vibrator can cover the edge of the vibrated part.

during pouring construction in rainy days, cover measures should be taken after concrete pouring to prevent rain from washing away mud and affecting concrete quality.

1.4.3 Maintenance and test of concrete

After concrete pouring, cover and water the concrete within 12 hours; Water curing time of concrete shall not be less than 7d for concrete mixed with portland cement, ordinary portland cement or slag portland cement, and not less than 14d； for concrete mixed with additives or with impermeability requirements; Watering times should be able to keep the concrete in a wet state; Concrete curing water should be the same as mixing water.

1.4.4 transportation and pouring of concrete

The foundation pouring concrete is transported to the site with a motor-driven dump truck. When the mixed concrete is transported to the site, it should be watered in time to avoid construction joints.

5 curing

Cover with plastic sheets or grass curtains for wet curing, and spray some curing liquid.

6 Scaffolding Project

1.6.1 In order to ensure that the construction will not interfere with each other, it is required that the external scaffolding meet the construction requirements

1.6.2 Material requirements

Scaffolding use? 48mm, 3.5mm thick steel pipe, steel pipe with serious corrosion, bending, flattening or crack is strictly prohibited;

The fasteners must be qualified Maanshan Iron and Steel Co., Ltd. and obtain the certificate of production. When the fasteners clamp the steel pipe, the minimum distance at the opening should be not less than 5 mm;

the wooden scaffold board should be made of pine or Chinese fir, and the thickness should not be less than 5 mm. Two galvanized steel wires with a diameter of 4mm should be used at both ends of the scaffold board.

1.6.3 the removal of the outer frame

A, the removal sequence should be carried out from top to bottom layer by layer, and it is forbidden to work from top to bottom at the same time;

B, all the wall parts should be dismantled step by step with the scaffold. It is strictly forbidden to dismantle the whole layer or several layers of wall parts before dismantling the scaffold;

C, when the scaffold is dismantled to the height of the last long steel pipe (about 6.5m) at the lower part, temporary bracing shall be erected at the appropriate position for reinforcement, and then the wall pieces shall be dismantled;

1.6.4 allowable deviation of scaffolding

correct the vertical and horizontal deviation of the bar at any time to avoid excessive deviation.

A, the vertical deviation and overall height deviation of the vertical pole are not more than 1mm；;

B, the horizontal deviation of the same row of main rails is not moved by 5mm ..

7 Other requirements for scaffolding:

a. Operators must wear safety belts during scaffolding;

B, the extension positions of the upper and lower rails are staggered in different vertical distances of the vertical poles, and the distance from the adjacent vertical poles is not more than 5mm；;

C, the small bar is close to the upright post, draped over the bar, and fastened with right-angle fasteners;

8 masonry engineering

1.8.1 bricklaying construction

Material requirements:

A. Bricks: varieties and strength grades must meet the design requirements, with factory certificates or test sheets.

B, cement: the variety and grade of cement should be selected according to the environment of masonry parts.

C. sand: medium sand.

operating conditions:

a. pop up the fence axis as designed.

B, according to the elevation, set up the measuring poles, and the spacing between the measuring poles shall be 2m.

Key points of masonry:

A. Brick watering: The clay brick must be watered and wetted the day before masonry, and it is advisable to soak the water in the four sides of the brick for 5mm, with a moisture content of 12%.

B, mortar mixing: the mixture ratio of mortar should be weighted, the measurement accuracy of cement should be 2%, and the sand and plaster should be controlled within 5%. It is advisable to use mechanical stirring for not less than 1.5 minutes.

C. Mortar: The following requirements should be met:

D. After standard curing for 28 hours, it should reach the strength specified in the design.

E, mortar in transportation and use, shall not produce bleeding, stratification, segregation and other phenomena, to ensure the uniformity of mortar components.

working conditions:

a. the brick yard stored on site should be compacted and leveled, without water accumulation, and should be neatly stacked. Handle with care during shipment to avoid damage, and try to reduce secondary transshipment.

B, according to the wall size and block specifications, properly arrange the layout design of masonry, and reduce the cutting amount on site as much as possible. C, outside the corner, block should be divided into skin bite, staggered build by laying bricks or stones.

D, the horizontal mortar joint thickness of masonry is generally 8-12mm; The width of vertical mortar joint is generally 8-12mm.

iv. painting works

the wrought iron fence must be well protected against corrosion and rust. Therefore, every dead corner and gap must be carefully handled when painting and welder construction. Brush one coat with antirust paint and two coats with silver powder paint. Before painting, the paint must be stirred evenly (to prevent the pigment from depositing during storage) and adjusted to an appropriate viscosity. Generally speaking, it is judged by experience that after the paint is lifted with a brush, 3-5 drops per minute will naturally flow. Brush less, from top to bottom, from left to right, from inside to outside, from oblique to straight, from difficult to easy, and from vertical to horizontal. Attention should also be paid to the last brushing: the vertical surface should be carried out from top to bottom; For horizontal surfaces, it should be carried out in the direction of light irradiation.

Main construction methods of cast iron railing installation project

Section 1 Entry quality inspection

1. After the railing enters the site, organize relevant personnel of the construction unit to conduct acceptance inspection and check the certificate of approval, etc.