Municipal road drainage system construction technology analysis?

Municipal road drainage system construction technology analysis of what is the specific content, the following Zhongda consulting for you to answer.

Cities are not only densely populated, but also rich in industrial and commercial activities, improve the quality of the road drainage system in order to ensure the normal operation of production and life. In the past, people do not pay attention to the role of the drainage system, construction companies in the construction of the design is unreasonable, construction is not standardized, so in the rainy season when a large amount of precipitation, there will be urban flooding, not only affecting the normal travel and life, but also damage to the structure of municipal roads. Clarify the common technical problems of the drainage system and strengthen the management of construction technology, which has become the research focus of practitioners. In urban planning and development, municipal roads are infrastructure, drainage system is an important part of the road, improve the level of construction technology in order to ensure the quality of the drainage system.

I. Functional role of municipal road drainage system

1. Improve the strength of the road surface

The construction materials of municipal roads, mainly gravel, cement, asphalt, etc., have good strength properties in a dry environment. However, if the pavement is soaked with water, it will destroy the cohesion between the materials and reduce the strength of the materials, resulting in a variety of diseases, such as pavement subsidence, roadbed washout, uneven settlement and so on. In this regard, it is necessary to reasonably design the drainage system, taking into account the long-term planning of the city, the dry season and rainy season, strictly control the construction process, and do a good job of pavement maintenance, can improve the strength of the pavement.

2. Extend the service life

Damage to municipal roads due to poor drainage, mainly in two aspects: First, in the cold weather of winter, rainwater infiltration to the inside of the pavement roadbed, the volume increases after freezing, it will destroy the road structure. Second, a large amount of precipitation when the water is retained in the road surface, will lead to asphalt layer spalling, loose, not only reduces the structural strength, but also increases the risk of traffic accidents. A good drainage system can remove excess water on the road surface in time to avoid rainwater infiltration or freezing, prevent damage to the road structure and extend the service life of the road.

Two, the drainage system of the structural composition and common technical problems

1. Structural composition

Road drainage system belongs to the underground engineering, due to the crossing of the road and building, and underground pipelines are numerous, so the construction has a certain degree of difficulty. System composition mainly includes drainage trunk, street drainage pipe, sedimentation wells, rainwater wells, etc., are described as follows: First, the street drainage pipe, the role of drainage, in the selection of pipeline, the requirement of strong corrosion resistance, can prompt sedimentation wells, rainwater wells in the body of water pooled into the inspection wells. Drainage pipe construction difficulties, on the one hand, a reasonable choice of excavation time, try to avoid the rainy season and winter; on the other hand, timely laying of lime gravel. Second, sedimentation wells. When the rain washes the road surface, it will produce silt deposition, the role of sedimentation wells, is the deposition and storage of silt, to provide conditions for emptying operations. During the construction period, generally wait until the sidewalk and side stone construction is completed, then start the construction of mud wells; well cover set on the right side, and the walkway board to keep parallel; and will be set up to check the hole, so that the staff to clean up the silt in time, to avoid causing pipeline clogging. Third, rainwater wells, also known as rainwater receivers, its side holes and drainage pipes are connected to the bottom of the downward extending soakaway pipe, prompting rainwater to the ground to replenish, and the use of drainpipes to timely remove excess rainwater. Currently used rainwater wells, mainly divided into two forms: one is 86 type, the other is double castor type. The former is easy to install and construct, but the silt deposition capacity is weak; the latter is complicated to install and construct, but the silt deposition capacity is stronger. Specific choice, should analyze the road project and urban drainage characteristics.

2. Common technical problems

First, fill collapse. In the construction of drainage system, fill collapse is more common, analyze the reason, mainly is the stacking around the drainage well is not dense, not in accordance with the norms and standards of construction; or concrete material configuration is not appropriate, especially the high water content. In this regard, should choose the density of backfill materials, and compaction; concrete configuration mixing, strict control of water content; for the parts that have collapsed, should be cleaned up the road surface and reinforcement. Second, pipe skew. Pipeline placement after the location is not correct, it may cause water problems, the reason is that the measurement work is not in place, the elevation, axis offset. In this regard, the geological environment should be analyzed before the measurement work to improve the accuracy of the measurement data. If buildings are to be avoided, the turning point can be increased to achieve seamlessness and improve the integrity of the drainage pipe. Third, poor drainage effect. The reason for the poor drainage effect is mainly due to the lack of sealing of the system, such as the overall subsidence of the foundation is not solid, or the leakage phenomenon caused by substandard piping materials. In this regard, the construction of late should focus on checking the mortar coating project, to ensure that the coating is uniform and without leakage, so as to improve the waterproof performance. When choosing piping materials, you should choose high impermeability, and combined with the terrain, climate characteristics, carry out water closure test.

Three, drainage system construction technology

1. Preparation

Compared with water conservancy and housing construction projects, municipal road drainage projects are less difficult, using less large mechanical equipment, to improve the quality of the project, should first do sufficient preparation. First, in the selection of the construction party, to investigate each other's qualifications, reputation, strength, to see whether the construction experience is sufficient, to see whether the process technology is advanced, to see whether the operating team has a sense of responsibility, etc.. Secondly, starting from the construction drawings, the owner side, design side, construction side and supervisory side should carry out drawing review to discover the deficiencies in the drawing design in time; then familiarize with the site environment, analyze the geological survey report, and communicate with the communication and electric power industry to prevent the destruction of the underground pipelines; and finally, scientifically formulate the construction organization design and reasonably configure the elements of manpower, machinery, materials and so on. Thirdly, before construction, divide different construction teams according to the sub-projects, clarify the key processes and key parts, implement the quality responsibility system, and realize the goal of whole process management and full management.

2. Measurement and placement

The measurement and placement work in the construction of the drainage system generally includes four steps: the first step, the technicians are familiar with the drawings, strictly according to the requirements of the drawings placement, to ensure that the control points are accurate and reliable, and the control points, the results of the placement of the line to review, the formation of a perfect measurement record. The second step, after the completion of the release line, to determine the location of the reference point, generally selected in the well or pipeline at the center line, as a key reference for later construction operations. The third step, supervisors review and acceptance of the measurement work, to ensure that the measurement data error meets the specification requirements, to ensure the accuracy of the results of the release line. The fourth step is to check the height of the well surface, which is generally required to be consistent with the horizontal height of the road surface. From the point of view of measurement practice, the technical points are: the well cover is slightly downward after the cover, which can promote the rain into the well; the line finally maintains the closed state, the closure error is controlled within the permissible range.

3. Trench Excavation

Before excavating the trench, the first thing to do is to test the soil quality, not only to ensure the reasonableness of the slope release, but also to reduce the construction cost. Design the bottom of the trench elevation, the use of section excavation method, after completing a section of the construction work on the measurement of a section, to avoid exceeding the bottom of the trench amount of earth. Once the phenomenon of over-excavation occurs, it is necessary to backfill in accordance with the requirements of foundation bearing capacity, and it is required to use high-quality backfill soil, and it is prohibited to use silt, garbage soil, humus soil, etc. In addition, if the water content in the excavated soil layer is high, waterproof drainage work should be done well, and water should not accumulate at the bottom of the trench; in the small excavation surface and the parts where the drawings are crossed, the support support program should also be set up to improve the safety of excavation.

4. Pipe installation

Pipe trough installation before, first of all, to lay the pipe foundation, based on the drawing design requirements, control the size, elevation, centerline and other parameters, and focus on controlling the quality of concrete, taking into account the transportation, climate, maintenance and other factors. After the pipe trench material is transported to the site, check the quality of the material before installation to see whether there are cracks, holes and other problems, and check the pipe foundation project again. In the pipe interface, due to extrusion may lead to mortar protruding from the joint parts, which should be dealt with in time, requiring the construction personnel to extrude the mortar and smoothing, to avoid debris clogging the pipe. After the installation of the pipeline, masonry sinkhole should be built to prevent positional deviation, and check the quality of the well wall to avoid cracks, hollow drums and other situations.

5. Pipe trench backfill

After all the above processes are completed, the pipe trench is finally backfilled, mainly with earth and stone powder. If the use of rammer and other equipment, the vibration effect may lead to pipe displacement, this time should be symmetrically synchronized backfill on both sides of the pipe; when the backfill height exceeds more than 50cm above the pipe, this time you can use bulldozers, rollers for crushing. It is worth noting that, before backfilling to check the trench, clean up the trench silt, water, debris, and backfill can not contain stones, bricks and other hard objects to prevent damage to the pipeline.

Four, conclusion

Drainage system is an important part of the municipal road, can improve the strength of the road surface, extend the service life. Analysis shows that the road drainage system is mainly composed of street drainage pipes, sedimentation wells and rainwater wells, and the common technical problems are fill collapse, pipe deflection and poor drainage effect. In this regard, preparatory work should be done before construction, and control should be carried out in four aspects, namely, measurement and placement, trench excavation, pipe installation and pipe trench backfill, so as to improve the quality of the project.

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