Environmental protection scheme for box culvert construction, introduction to the construction plan

1) Organizational safeguard measures.

1. Mobilize a team with rich construction experience, and select excellent technicians and high-quality management personnel to participate in the construction.

2. The construction team and above units set up a quality management team, the first manager personally took charge, equipped with full-time quality inspection engineers and quality inspectors, formulated the corresponding quality post responsibility system, and pushed the total quality management and target responsibility system management system, so as to make the excellence plan truly implemented from the organizational measures.

3. Establish a strict quality management system, implement the right of veto on quality, resolutely put an end to the occurrence of violations of rules and regulations, and strengthen the implementation of inspections in construction, so as to achieve "whole process, all-round" monitoring of project quality, regular inspection, reward the good and punish the inferior, and resolutely rework and redo the project if the quality of the project does not reach the excellent plan.

4. Actively cooperate with the supervising engineer to supervise and inspect the quality of the work infiltration process and improve the construction quality.

5. Adhere to the "standardization, standardization, and proceduralization" operation.

2) Technical guarantee measures.

1. Carry out construction in strict accordance with the construction specifications and operating procedures, and formulate various process and technical standards in combination with the characteristics of the project and the excellence plan.

2. Formulate practical quality inspection procedures, so that each construction link is under control, each process has quality records, the whole construction process is traceable, and regular quality special meetings should be held to find problems and correct them in time to promote and improve quality management.

3. The technical data and construction control data are detailed, which can correctly reflect the whole process of construction and accumulate synchronously with the construction, and meet the requirements of completion inspection.

4. Strengthen the job training of professional and technical workers to improve the level of practical operation.

5. Establish strict procurement procedures for raw materials, semi-finished products and finished products, and strengthen the inspection and management system.

6. Strengthen and improve the quality monitoring means and equipment, and the manager department is equipped with sufficient technical force, instruments and equipment and supervision engineers to strictly control the quality.

Measurement control: According to the requirements of the construction process, full-time personnel and surveyors with rich measurement experience are equipped, and the measurement data must be calculated and reviewed by more than two people before they can be used.

Raw material procurement and test control:

Conscientiously implement the supervision system, all materials used for the project and the first must be approved by the supervision engineer, and its quality and performance must meet the technical specifications and other standards.

Strengthen the acceptance of raw materials, the main materials of the project such as steel, concrete, etc. should fill in the declaration form, and carry out the necessary acceptance test and quality inspection, unqualified raw materials refuse to enter and use.

1. Formwork and scaffolding.

1) formwork box culvert formwork adopts wooden formwork, and the scaffolding, support rod, bracket and other supporting materials such as cavity support, wood or materials agreed by the supervising engineer are used for support, and can meet the size and strength, so as to ensure that the formwork does not exceed the allowable deformation of the formwork in the process of concrete pouring vibration and solidification. The deflection of the exposed formwork on the surface of the structure is not greater than 1 400 of the span of the formwork member, and the deflection of the formwork concealed on the surface of the structure is not greater than 1 250 of the span of the formwork member.

2) The metal tie rod or anchor rod in the template is set at a distance of 50mm from the concrete surface, so that the concrete will not be damaged when taken out; When a tie rod needs to be set up in the middle of the concrete, a small plastic pipe can be buried first for the use of the tie rod, and the mortar of the same grade is filled in the pipe after the mold is removed.

3) The template should maintain the specified linear shape during the installation and pouring process until the concrete is fully hardened, and the reused template should always maintain its linear shape, strength, impermeability and smooth surface, and the template must be cleaned before pouring, and the consent of the supervising engineer must be obtained.

Changzhou municipal Wuwei county south of the new city of the army two (by one) road bid section of the box culvert special construction plan.

4) The template oil must be used in a formwork oil that is acceptable to the supervising engineer.

5) Template seams: The template seams should maintain the beauty of the linear shape. For the formwork with loose joints, a layer of sponge is sandwiched in the middle before it is fixed, and the horizontal and vertical seams of the formwork should run through the entire structure.

6) Removal of formwork and scaffolding.

a.The consent of the supervising engineer must be obtained before the removal of the mold. When the formwork is removed, ensure that the concrete will not be damaged.

b.For the non-load-bearing side mold, the mold can be removed when the strength of the concrete reaches it; For the load-bearing cluster formwork of the structure, the span diameter is greater than 3m, and the concrete reaches 70% of the design strength before the mold can be removed.

1. When the template is removed, the template connector should be dismantled first.

2. The concrete strength of the wall must be reached under normal temperature conditions, and the concrete strength of the wall must be reached under the conditions of winter application before the formwork can be removed, and the smooth disassembly of the wall bolt should be ensured.

3. During the normal temperature period, the concrete of the wall should be ensured to ensure that there is no lack of edges and corners.

4. The flow direction of demoulding is first pouring and first dismantling, and then pouring and then dismantling, which is consistent with the direction of construction flow, and the order of dismantling the template is just opposite to the installation template. When dismantling the wooden formwork, first loosen the 3-shaped buckle to remove the steel pipe, and then loosen and remove the screw through the wall, loosen the support adjustment screw or make the formwork completely detached from the concrete wall.

5. When there is adsorption or bonding in the local area, it can be moved with a skid stick at the lower mouth of the template, but it is not allowed to shake at the mouth of the wall or smash the template with a sledgehammer, and the removed wall bolts, gaskets and pins should be counted and put into the toolbox for turnover.

6. When the wall template falls to the ground or turns over to another working face, it must be placed firmly at one time, and the inclination must meet the requirements of 75° 80° self-stabilization angle.

7. After demoulding, clean the board surface in time, take advantage of the moisture and easy to clean the board surface, use a flat shovel knife, wire brush and other tools to remove the mortar or separator residue adhered to the board machine, and then wipe it with cotton silk and apply a refreshed separator.

8. In order to ensure the quality of the formwork during on-site construction, special personnel are assigned to carry out formwork maintenance and maintenance.

9. The reserved hole template shall be disassembled by overall demolition.

Because the box culvert belongs to the culvert and has not been cleaned for more than ten years, a large number of toxic and harmful gases may be produced when dredging and bagging and agitating the sludge, and the construction period is tight, in order to ensure safety, the following protective measures are taken:

1. The work of the lower ear oak ditch must be up and down the stairs, and the operators of the lower ditch must wear masks, gloves, water pants, and oxygen bags.

2. In addition to mechanical operation, other operators under the box culvert must rest on the ground for more than 15 minutes after working for 1 hour, and then go down to the box culvert for construction work.

3. Arrange special guesses to be responsible for safety supervision and vigilance to avoid all safety production accidents. The supervisor and the reservoir must be in close contact with the reservoir management personnel, and the sluice gate shall not be opened to release water during the dredging period. Equipped with a set of walkie-talkies, it is convenient for the construction personnel in the box and the supervisor to communicate in real time.

4. In order to ensure the safety of operators and avoid accidents, 20 oxygen bags are equipped.

5. The box culvert sludge is deposited for many years, and a large number of toxic and harmful gases may be produced after the agitation of the tool. In order to prevent the air duct from being squeezed and damaged by debris and affecting the use function, it is necessary to use a PVC pipe larger than the diameter of the air duct to cover the air duct, and weld the casing joint with a steel bar to make the casing overhead.

6. When installing air ducts and casings, the construction personnel need to wear anti-virus oxygen supply equipment, and start air supply 1 hour in advance before starting dredging to discharge the harmful gases that may be contained in the original box culvert, and the construction personnel shall detect the oxygen content in the air before entering, and the oxygen content shall not start construction if the oxygen content does not meet the requirements. Oxygen content detection method, before construction, put live animals into the box culvert working face for 30 minutes and then take them out to check their vital signs.

7. Due to the darkness and dampness in the culvert, the construction personnel need to be equipped with a safe voltage lamp when entering the culvert construction, and the lighting lamp voltage must be less than 36 V.

Very detailed box culvert construction animation demonstration, worthy of reference by the construction unit!

1. Lofting.

2. Digging the foundation and treating the substrate (hardening, drainage, etc.).

3. Pave the gravel cushion and smooth the mortar.

4. Lofting the foundation edge line, the position of the steel bar, binding the foundation and the side wall steel bar 5, and installing the foundation side mold and the inner mold.

6. Pour concrete for the foundation and part of the side walls.

7. Install all steel bars and all side wall formwork.

8. Pour concrete for side walls and roofs.

9. Be strong. 10. Dismantle the internal and external templates.

11. Packing after backfilling table.

12. Pour the guardrail of the far edge of the road and backfill the top filler.

Measurement stakeout

Foundation pit excavation foundation pit bearing capacity detection

Foundation reinforcement and culvert reinforcement

Embedded installation template

Concrete is poured in blocks for the bottom slab

Tie the steel bars of the culvert body and install the formwork

Concrete culverts are poured in sections

Install full scaffolding and cover plate bottom formwork

Binding cover plate reinforcement, vertical formwork pouring cover plate concrete

Hole stacking and eight-character wall construction

Filling, sealing, cover plate joints, settlement joints, asphalt hemp wadding, filling and outer asphalt cloth sealing, outer wall of culvert body and upper surface of cover plate brushed with asphalt waterproofing agent, culvert back backfill.