With the application of various new technologies and new processes, water supply and drainage pipeline construction has achieved certain results, but there are still some shortcomings in general, which need further research on construction technology, that is, according to the characteristics of engineering construction, determine the construction points and continuously improve the engineering construction effect. This paper analyzes the problems existing in the construction of water supply and drainage pipeline in building engineering, and studies the construction technology according to the construction points.
In order to meet people's various needs, the construction of water supply and drainage system in building engineering faces more requirements, and the construction effect of water supply and drainage pipeline has a close impact on the construction quality of the whole system. Although many new technologies and new processes are applied, the construction effect will inevitably be affected due to the construction characteristics and various influencing factors. Therefore, in order to meet the engineering construction effect, it is necessary to determine the construction points, analyze the existing problems, and study and manage the key construction technologies.
First, the lack of building water supply and drainage pipeline construction
1. Water supply and drainage pipeline leaks
Pipeline leakage is a common problem in the construction of water supply and drainage system, which has a bad influence. The main reasons for this kind of problem are uneven settlement of foundation, pipeline material not meeting the construction requirements, and poor construction quality of pipeline interface and shaft. In order to effectively improve this kind of problems, it is necessary to analyze specific problems, and on this basis, choose appropriate measures for management to reduce the probability of problems. For example, poor foundation conditions of pipelines lead to uneven foundation settlement, which will cause local water accumulation in pipelines and even serious problems such as pipeline fracture and interface fracture. In view of this, the construction must be carried out in strict accordance with the design scheme to ensure the construction strength and stability of the pipeline to meet the construction requirements. In case of adverse geological and hydrological conditions, replacement is needed to ensure that the bearing capacity at the bottom of the foundation trench meets the construction requirements. In addition, if there is water in the geosyncline, measures should be taken in time for drainage treatment to ensure the dryness of the geosyncline. When excavating, try to reserve a soil layer with a thickness of 20cm at the bottom of the geosyncline, and seal it while carrying out subsequent construction.
2. Check the deformation and settlement of the well.
The deformation and subsidence of manhole in water supply and drainage pipeline will affect the application effect of the later system. The main reasons for such problems are unqualified manhole cover quality and installation quality, and unqualified installation quality of iron ladder, which will not only affect the engineering quality, but also affect the aesthetics of engineering construction [2]. In order to avoid this kind of problem, we should do a good job in the management of inspection well foundation and cushion, and take the way of broken pipe as chute to avoid the occurrence of open caisson. In view of wellbore deformation, do a good job in the quality management of wellbore masonry to ensure that the center position and height of the well chamber and wellhead meet the construction requirements. In addition, the supporting management of manhole cover and Jing Zuo should be well done, and the mortar should be full during installation. For the installation and construction of the iron ladder, it is necessary to manage the position of the first step up and down, and control the deviation and plane position.
Second, the building water supply and drainage pipeline construction preparation points
1. Drawing review
Before the formal construction of the pipeline project, the rationality of the construction scheme must be jointly reviewed. On the basis of comprehensive analysis of the collected data, the problems and deficiencies in the construction scheme are determined and corrected in time to ensure that it meets the actual requirements of the site and construction and meets the requirements of engineering construction as a whole. Combined with the characteristics of pipeline construction, in order to reduce the later contradictions, the pipeline and structures that may be encountered in the construction are studied, so as to do a good job of leak detection and fill in the gaps and improve the enforceability of the construction scheme.
2. Resource management
First, do a good job in the management of building materials, reasonably select material suppliers, and ensure that the performance and quality of building materials meet the requirements of engineering construction. For example, do a good job in specification and performance control of concrete pipes, cement and sand to ensure that they meet the design requirements. In particular, to do a good job in the management of concrete pipes, the procurement personnel need to go to the factory for on-the-spot investigation, and sign a supply contract after passing the quality sampling inspection. Quality acceptance should be carried out before the materials enter the site, and whether there is a certificate of approval and a quality acceptance sheet. Only after passing the acceptance can they enter the site and put into use. Second, the construction equipment. For the selection of construction equipment, it is necessary to combine the construction site and construction technical requirements, do a good job of maintenance and repair after entering the site, and reduce the occurrence of equipment operation failures. Third, the construction personnel are an important factor affecting the construction quality, so people with construction experience should be selected to participate in the construction, and the construction can be carried out in strict accordance with the specification requirements.
3. Building behavior management
Safety facilities, such as safety ropes, roadblocks and other warning signs, should be set at both ends of the trench, regardless of the scale of the project. If you can't finish it during the day, you need to hang a red light at night, and you need one every 30 meters. For intersections, the number of street lamps should be appropriately increased. In addition, in order to ensure the excavation quality, the groundwater level and structures should be determined in combination with the geological survey report. If the pipe trench is close to the building, the ground should be cleaned in advance and safety protection measures should be taken. Among them, for some trenches with water accumulation due to the influence of groundwater level, drainage treatment should be carried out in time, and pile support should be done well to ensure that trench excavation can meet the construction requirements.
Three, building water supply and drainage pipeline construction technology management
1. Construction survey
Construction survey runs through the whole project construction process, which needs professional and technical personnel to complete, so as to avoid human factors affecting the accuracy and timeliness of measurement results. Self-inspection and self-inspection can be selected for measurement, that is, after being measured by professional technicians, another measurement engineer will recheck the results to control the measurement error within the allowable range.
2. Trench excavation
Earthwork excavation is an important part of water supply and drainage pipeline construction in building engineering. Generally, tire excavators and bulldozers are selected as the main machinery, and the excavation construction is carried out by man-machine combination. After trench excavation, the earthwork will be transported to the planning area by dump trucks. Among them, in trench excavation, once cables, pipelines and structures are encountered, it is necessary to hand over the data results and treatment schemes to the owner and relevant units for determination, and continue to complete trench excavation after the existing pipelines and structures are protected and relocated.
3. Pipeline foundation manufacturing
After the acceptance of trench excavation, the design size, center line and label of pipeline foundation shall be made and constructed according to the design drawings. Among them, the exposure time of soil basement should be well controlled in the construction process to avoid adverse effects on pipeline construction quality due to too long time. At the same time, it is necessary to control the influence of climate, environment and other factors, and do a good job in long-distance transportation and post-maintenance of concrete. In order to ensure that the fabrication strength of pipeline foundation meets the requirements, we can choose concrete materials with higher strength grade or use early strength agent to ensure that the strength of pipeline foundation meets the construction requirements when laying pipes.
4. Pipeline installation
First, the construction pipeline must be seamless or perforated, and the pipeline with quality problems should be replaced in time. In addition, before the formal pipe laying, it is necessary to carefully check whether the elevation and size of the center line, well foundation and sideline of the pipeline foundation meet the requirements of the drawings, and at the same time control the position and spacing of inspection wells to ensure that the structural strength of each part of the pipeline meets the construction requirements [3]. Second, when the pipeline is formally installed and constructed, especially when the interface is constructed, the protruding joints formed by extrusion should be treated to avoid the reduction of the cross section of running water and ensure the normal water supply and drainage after the pipeline project is put into use. Thirdly, for the installation and construction of pipelines, it is necessary to flatten the extruded mortar by straw bag method. For pipes with a diameter of more than 400mm, you can choose to use manual methods when dealing with them, that is, workers drill into the pipes, smooth out the mortar extruded at the joints, and fill in the loose joints to ensure that the pipeline works are watertight. After all links are processed, the sundries in the pipeline should be thoroughly removed.
5. Closed water test and backfilling
Before the closed water test, the pipeline must be inspected comprehensively to ensure that there is no fill in the pipeline, no water in the groove and no water leakage in the reserved holes. After the inspection is correct, the closed water test shall be conducted in sections from upstream to downstream. During trench backfilling construction, the acceptance of concealed works must be guaranteed, and the backfilling method should be determined according to the actual needs of different positions. For example, the chest part should be backfilled symmetrically on both sides at the same time. If it is mechanical backfill, it is necessary to manually backfill the chest and the part around the inspection well 0.5m above the pipe jacking, and the rest will be mechanically backfilled in a large area.
Conclusion:
In the technical management of water supply and drainage pipeline construction in building engineering, the existing problems should be analyzed. On the basis of determining the management points and according to the construction characteristics of the project, corresponding measures should be selected for management, so as to improve the effectiveness of construction technology application and ensure the construction effect to meet the requirements of relevant codes.
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