1. 1 Inspect the customized reinforced concrete pipe products.

In order to ensure that the customized reinforced concrete pipe products can meet the design requirements, it is necessary to check the strength, finished product size and appearance of reinforced concrete. After the round pipes are transported to the site, each round pipe must be inspected and the factory certificate must be accepted. Appearance inspection mainly includes the following contents: check whether the pipe body is cracked, bare, exposed, deformed and peeled. If the inspection is unqualified, the work must be stopped. This link is the key to prevent leakage, so we must check it carefully.

1.2 Chisel the hair at the front end of the circular tube.

When plastering, in order to better combine the mortar with the pipe joint, the following methods can be adopted: chisel the front end of the accepted concrete round pipe with a chopping axe, and it is required that the width of each end must be 2 ~ 3cm greater than the plastering width 1/2, and the elevation of the pipe end, that is, the pipe wall part, should also be chiseled. When chiseling, the laitance layer on the surface of prefabricated silicon should be chiseled away. In order to avoid damaging the pipe body, do not use too much force when chiseling.

1.3 exhaust pipe connector

Pipe rows are reinforced silicon circular tubes placed on the foundation of concrete slabs. The joint is the distance between two pipes, and the width of the joint is an important factor for the leakage of the pipe. Relevant standards stipulate that the joint width should be10 mm. If the joint is too narrow, it will make less mortar filling and it is difficult to form an effective adhesive tape. On the other hand, if it is too wide, it will also adversely affect its use function.

1.4 Treatment of joint bottom

After the pipe laying is completed, the pipe joint concrete should be poured, and the bottom of the joint should be treated accordingly to prevent the pipe joint from leaking silicon when pouring and vibrating. The specific treatment measures are as follows: clean the flat foundation at the bottom of the pipe with water → brush cement slurry on the flat foundation → fill sand mixture in dry cement. This mixture has certain looseness, which is convenient for extrusion and compaction, reduces the possibility of drying shrinkage after molding, and can effectively prevent leakage. The concrete construction steps are as follows: a steel bar consisting of two semicircles is placed at the joint as an internal mold, and the steel bar is φ 8 steel bar, so that the radius of the circular ring is consistent with the inner diameter of the pipeline, and the steel bar ring is fixed with a wooden wedge. Fill the joints on both sides of the pipeline with the mixture, and then manually ram the joints on both sides several times with a hammer and a stake. After the bottom treatment is completed, take out the reinforcing ring.

1.5 Pipe socket concrete

After the bottom of the joint is treated, the tube base template can be supported. According to the construction verification for many years, it is difficult to completely rectify the leakage of concrete waterproof bricks marked C 10 or C 15. On the basis of ensuring the strength of concrete, increase its sand content to enhance the anti-seepage effect.

1.6 Paste the sewing interface

The specific construction method is as follows: cleaning: clean every joint to ensure that there is no pollution at the interface. Then rinse with water, which can not only float but also sink, and fully wet the interface. Brush slurry: in order to make the mixture firmly bonded with the pipe wall, brush the cement slurry at the joint with a brush. Internal support: Internal support is generally divided into two types: large diameter and small diameter. The large diameter is made of steel plate at the interface of the inner wall of the pipeline, and the bracket is processed and shaped by itself. The self-adjustment of tightness can be effectively realized by the "tightener" with screws at both ends. The width of the steel strip is set to 50 mm and the thickness is 3-5 mm; If the small diameter can't get in, you can use the steel bar half circle as before. Adhesive material: the same as the bottom of the above interface. Bonding: after the bracket is fixed, fill the joint with sand mixture in dry cement, and embed the wood strips into the joint while tamping. When tamping the batten with a hammer, move the batten until the whole batten is compacted. Then fill it 5mm away from the outer wall of the pipe and cap it with cement mortar. Dismantle the inner support and treat the inner wall of the joint: tamp the joint mixture, dismantle the inner support and treat the inner wall of the joint circumferentially with mortar. In order to reduce the resistance of water flow, it must be compacted and polished as much as possible.

1.7 irrigation test and temperature control

Irrigation test: In order to check the cementation effect, irrigation test must be carried out immediately after cementation of two wells. In this process, the irrigation speed should not be too fast, and strict inspection must be carried out along both sides of the pipeline. If leakage of open water is found, water injection must be stopped immediately, and the water should be pumped out so that the water level is not higher than the leakage point, and then it should be repaired in time. Temperature control: Because sewage pipeline construction is exposed to the environment, it is greatly influenced by external factors. Therefore, the overall temperature of concrete pipeline should be effectively adjusted by using the characteristics of water heat absorption and thermal energy conduction.

1.8 Wipe the adhesive tape

After the irrigation inspection is qualified, joint plastering can be carried out: (1) joint cleaning treatment: repeatedly brush and wipe impurities such as laitance on the surface of the intermediate pipeline in the plastering area with a wire brush, and then clean it with a broom. (2) Wetting with water: wetting the interface surface with a brush, and the wetting range is not less than 3-5 cm of the tape width. (3) daub cement slurry: daub cement slurry on the joint, which must be uniform and not too thick. (4) Steel mesh cement mortar plastering: Cement mortar plastering in mortar test 1:2.5, with appropriate consistency. The thickness of plastering belt is about 25mm, and it can meet the design thickness standard after twice plastering. After the first layer of mortar is painted and perfectly bonded in the assembly, the steel wire mesh pieces on both sides of the pipeline are caged and pressed into the layer, and then the second layer is painted. The thickness of the self-made tool meets the design requirements.

1.9 closed water experiment

Pipes and manholes must be strictly inspected. After the closed water section reaches the specified strength, the tightness test of the closed water experimental pipeline can be carried out. The water level of the closed water experiment must be controlled at 2 cm above the upper pipe of the experimental section. After soaking in water 1d, the water seepage is calculated by using the water level drop value. If the actual water seepage is within the allowable range and there is no open water in the pipeline and inspection well, the closed water test meets the requirements.

2. Strengthen the management of anti-seepage construction process.

2. 1 Ensure procurement quality

It is an important factor to control the construction quality of municipal rainwater and sewage pipelines and the quality of pipeline construction materials, and it is also a common factor of quality problems. Attention should be paid to the procurement of materials, which can be mainly reflected in the following aspects: in the procurement process, the background and qualification of pipeline material manufacturers should be audited, and the technical content of materials should also be audited, and materials such as mechanical test reports should also be inspected. When checking the qualification of the manufacturer, the purchaser only needs to simply observe and check the quality of the material, and can identify it by tapping the sound made by the material. The procurement system should also be improved to avoid loopholes and lead to unqualified materials.

2.2 Strengthen the inspection in the construction process.

Necessary measures should be taken in the construction process to ensure the smooth progress of the whole construction. In the process of construction, construction technicians, construction operators and construction management personnel should master the situation and environment of the site, make good preparations for construction, and inspect and supervise the use of materials, equipment and operation technology to prevent quality mistakes. In the core link of engineering construction, the construction details can be inspected and audited regularly, and necessary measures can be taken for quality problems to prevent the foundation from being unstable during construction and affecting the smooth development of the project.

2.3 Strengthen the supervision of construction quality

Improving the construction quality of municipal rainwater and sewage pipelines can not only improve the travel environment of residents, but also avoid the problem of urban waterlogging, and greatly improve the service life of municipal roads and the exertion of architectural functions. Therefore, controlling and supervising the construction quality of municipal rainwater and sewage pipelines can better solve the quality problems in the construction of urban rainwater and sewage pipelines.

2.4 Strengthen the inspection of the construction process.

The construction of municipal rainwater and sewage pipelines is complex, and many uncontrollable factors often appear in the construction, which will have a great impact on the construction quality. Therefore, necessary measures should be taken in the construction process to ensure the smooth progress of the whole construction. In the process of construction, construction technicians, construction operators and construction management personnel should master the situation and environment of the site, make good preparations for construction, and inspect and supervise the use of materials, equipment and operation technology to prevent quality mistakes. In the core link of engineering construction, the construction details can be inspected and audited regularly, and necessary measures can be taken for quality problems to prevent the foundation from being unstable during construction and affecting the smooth development of the project.

3. Concluding remarks

Municipal pipeline construction engineering technology plays a very important role in urban development and urban environment protection, and it is also the basic guarantee for urban construction and sustainable development. In the process of municipal polluted pipeline construction, the construction technology adopted will directly affect the construction quality of the project. Because the sewage pipeline project is closely related to the city appearance and the sustainable development of the city, it is necessary to continuously study and analyze the construction technology of the sewage pipeline project, continuously improve the professional quality of the construction personnel, and combine the technical control measures in the construction process to build a high-quality sewage pipeline project to better serve the urban construction.

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