The construction technology of municipal roads and pipelines is very important. It is very important to exchange the technology to complete the project more efficiently and improve each construction detail. The construction network Xiaobian will discuss the construction technology of municipal roads and pipelines and introduce them to you.

 

1 construction survey

 

The construction survey has strong technicality and runs through the entire construction project. It must be carried out by special technicians to ensure timely and accurate construction survey. At the same time, in order to ensure that each process in the construction process can withstand digital error-free detection, in the self-test self-test construction process, we have higher and higher requirements for measurement accuracy.

 

2 pipeline laying and construction process

 

2.1 Demolition of urban roads

 

In order to ensure the safety of the project and the quality of the subgrade, the road to be laid should be measured and laid, the axis of the pipeline should be determined, the location of the erection point, the depth of the burial, the location of the inspection well and the gully should be removed, and the surface of the road should be removed by an excavator. The asphalt surface layer and the roadbed slag layer are measured by the backhoe excavator and excavated. When excavating the piled soil, it is necessary to ensure that the soil is more than 3.0 m from the edge of the foundation pit of the pipeline, and the pile height is below 3.0 m.

 

2.2 trench excavation and support

 

When excavating the groove, according to the calculated excavation width, the excavation line is marked with paint, and the asphalt surface layer and the concrete surface layer of the road surface are cut by a cutting machine. Ensure the scientific, safe and economical slope grading to ensure the safety of construction and the smoothness of the roadbed. During the excavation process, the excavator is used to excavate the broken asphalt and road slag on the surface of the road, and every time a certain distance is excavated, the measurement of the height of the shovel must be strictly confirmed. It is important to note that the top of the tank must not exceed Digging, if there is over-excavation, you should immediately backfill the over-excavated part. It is strictly forbidden to inject water into the lower part of the trough, and it is strictly forbidden to use humus, garbage, silt, etc. when filling.

 

2.3 Pipeline foundation construction and installation

 

The foundation of the rainwater pipeline can be 120° or 180° concrete foundation, and the number should be above 10MPa. The concrete used in the project is stirred on site, excited by dump truck transport, transported to the pouring section, the concrete is sent to the pit, and then the plug-in vibrator is used to vibrate and compact; before installing the pipeline, it is necessary to check and verify the pipeline again. Quality, after determining the quality, lifting with 12t truck crane, light lifting in the lifting process to avoid damage to the pipeline. Lighter weight pipes are handled by hand. The socket-type rainwater pipe shall be cement mortar interface with a bandwidth of 12cm and a thickness of 3cm.

 

2.4 Inspection well construction

 

When inspecting the well construction, it is necessary to measure first, then pour a 10 MPa concrete foundation, and when the strength reaches 2.5 MPa, the well wall can be built. After the completion of the inspection of the wells, the thickness of the inner and outer walls of the inspection well is 20 mm with a 1:2.5 cement slurry, and the surface is required to be flattened and calendered, and no empty drums or cracks may occur.

 

2.5 gully construction

 

During the construction of the gully, the measurement is staked first, then the 10 MPa concrete foundation is poured, and the well wall is built by artificial hanging wire, and then the inner wall of the 1:2.5 cement slurry is used. Install the gully ring and ensure that the slurry is stable during installation. Finally, it is necessary to build the teeth and place the cast iron tweezers.

 

3 water supply pipeline project construction technology

 

The most important content in the construction of municipal road pipeline engineering is the construction of water supply pipeline project, and some unique techniques and techniques are applied in engineering practice.

 

(1) First measure the centerline of each sub-line, and put on the steel pile or stake, which is used as a fixed reference for the elevation and center of the water supply pipeline.

 

(2) Excavation of the pipeline by using the trencher according to the measured centerline, and combined with the artificial mutual cooperation method, the pipe trench can be determined by referring to the different pipe diameter and the nature of the construction site soil when excavating the earth. The grading factor. This project uses mechanical excavation. The bottom of the trough should leave enough soil layer in advance, usually 15~25cm. After that, use artificial excavation until the design elevation is dug to ensure that the soil layer is not scratched.

 

(3) Installation and construction of prestressed reinforced concrete. First of all, the installation procedures of the construction project are: row pipe, lower pipe, cleaning pipe nozzle, cleaning apron, upper rubber ring, preliminary alignment, top loading interface, inspection center line, elevation, inspection of rubber ring with probe Location and installation of the lock tube. Next, install the pipe joints. This project uses a 12t crane to lift each pipe section inside the pipe slot and install the pipe according to the measured centerline. When installing, the first step is to apply lubricant to the tail of the tube and the inside of the socket, and then insert it into the plug. When installing the pipe joint, the first pipe socket is forward, and after the second section of the tail plug is aligned, the 3T horizontal tensioner is used to uniformly push it to the designated position to ensure the rubber ring has good sealing performance. After completing the installation procedure of the first and second tube, the tension machine is temporarily loosened, and the wire rope tied to the second tube is unwound, and the tension machine is still fixed on the first tube, and the third tube is installed according to the above process. , in order.

 

4 pipe steel pipe installation technology

 

The installation of pipeline steel pipe runs through the construction of the entire municipal road pipeline engineering. Firstly, the quality of the pipe material must be ensured. The interior of the pipeline should be treated with anti-corrosion and anti-rust according to the requirements of the code. The cement slurry is sprayed inside the pipeline, and the outer wall is coated with anti-rust oil. Preservative treatment. Discharge the steel pipe according to the measured center line, spot weld and seam. Pipeline steel pipe installation according to the drawings, pipe sealing test after ensuring good sealing, and finally flushing and disinfecting the pipe.

 

5 Conclusion

 

This paper combines the construction practice of a municipal road pipeline engineering, proposes measures to solve the problems that are easy to occur in the construction technology of municipal road pipeline engineering, and focuses on the installation technology of the pipeline engineering, which can provide a certain improvement for the construction quality of municipal road pipeline engineering. Reference.