A brief discussion on farmland water conservancy project construction technology?

In order to obtain high-quality, fast and effective construction results, and promote the effectiveness of on-site management, realize the orderliness of the management team, so that personnel can fully master the technology, the technology is advanced, the methods are scientific, and the equipment is equipped Construction forces suitable for this major are important factors to ensure the progress and effect of the project. After reasonably analyzing and grasping the status of the project, it is necessary to mobilize the enthusiasm of the personnel and make full efforts for the smooth completion of the work to ensure that the work is completed within the prescribed time. Complete the work within the deadline.

General construction layout

The bidding documents must be implemented during construction. The construction process should be based on the drawings as a reference, grasp the site conditions, arrange the owner's living environment, reasonably allocate on-site resources, and ration The principles for auxiliary devices, including temporary residence and experimental equipment, are as follows:

2.1 Eliminate unreasonable construction and reduce the occupation of agricultural land. The architectural layout considers human senses and saves land.

2.2 Plan transportation, economize, and rationally allocate transportation resources. Stay safe.

2.3 The determination of the construction site and the division of the work scope must be based on formal construction procedures to reconcile the technical and tool conflicts between projects and reduce mutual interference.

2.4 Make rational use of original buildings and facilities to reduce unnecessary investment.

2.5 Pay attention to the convenience of facilities and consider the convenience of workers.

Main construction methods

3.1 Controlled cement grouting anti-seepage curtain grouting

3.1.1 Lay out anti-seepage curtains within the dam foundation, and use controlled cement grouting anti-seepage curtains. Permeability curtain, its curtain structure, grouting mechanism, grouting method and construction-related technical parameters control, the curtain generally needs to select three rows of holes, and the thickness of the curtain is determined by the hole spacing parameter of the grouting holes.

3.1.2 The controlled cement grouting curtain must use a dual-liquid grouting device, and a special pump must be used to inject the chemical control liquid using the dual-liquid grouting method to control the poured cement slurry to reach a certain gel time.

3.1.3 Grouting pressure selection The maximum grouting pressure value of the controlled cement grouting curtain requires that the additional compressive stress value generated by the grouting pressure within the anti-seepage curtain body must exceed the allowable compressive stress value of the formation, so the control On the one hand, the grouting pressure value of high-performance cement grouting is selected to far exceed the allowable compressive stress value of the formation so that it can meet the requirements of compacted formation. On the other hand, the grouting pressure must also meet the planned grout volume and ensure the curtain thickness requirements. During the grouting process, as the grouting continues, the amount of grout will become smaller and smaller, while the grout pressure will become larger and larger, which can prevent the formation from lifting and causing the problem of stringing grout.

3.2 The anti-seepage reinforcement of the dam foundation in this project adopts curtain grouting construction technology

3.2.1 The selection of cement varieties should be considered based on the expected effect and the surrounding environment. Pay attention to the degree of corrosion resistance Generally speaking, Portland cement and Portland dam cement are the two more common choices.

3.2.2 The cement grade used for backfill grouting should not be lower than No. 325. The cement grade used for curtains and consolidation grouting should not be lower than No. 425.

3.2.3 The cement used as the grouting raw material must be pure and uniform in texture. Deterioration and dampness cannot be used. Special attention should be paid to the storage time and storage location of fine cement.

3.2.4 The grouting water should meet the water requirements for mixing hydraulic concrete.

3.3 Earthworks

Testing the size of the edge piles is an inevitable preparation for the follow-up work. After cleaning up the county, measure the cross section again to propose a reasonable The stone mixing method will be handed over to the supervision engineer for study and decision-making, and construction can only start after approval.

3.3.1 When checking data, surveyors should check the measurement points again according to the requirements of the design drawings. After checking that there are no differences, the detection results can be networked, so that the on-site status can be comprehensively and systematically grasped.

3.3.2 To carry out stakeout measurements, take the center line of the pipeline, roads, and well locations as key points of the project. Once measurements are taken, these points must be closed and restrictions must be paid attention to. Error caused by closure.

3.4 Manual earth excavation

3.4.1 Preparation work for earth excavation Check the preparation status of excavation and earth moving tools, and complete the plan design of earth excavation construction.

3.4.2 Process flow: Determine the order and slope of the excavation → cut out the trough edge outline along the gray line → excavation in layers → dig and trim the trough edge → clean the bottom.

3.4.3 Construction key points: (1) Excavation sequence: Measure and set out → tangent layered excavation → drainage of precipitation → slope repair → leveling → leaving sufficient reserved soil layer, etc. The soil slopes of this project are set according to regulations. The excavation of soil is carried out in horizontal sections from top to bottom, with each layer about 0.6m. The width and slope of the pit bottom are checked while digging. Over-excavation or under-excavation is not allowed. (2) Pay attention to drainage before excavation, and use ditches as drainage channels to prevent anyone from entering the pit directly, causing impact on the slope and causing structural damage. (3) The amount of soil excavation should be based on the base elevation, and the amount of excavation should be strictly controlled to prevent over-excavation and under-excavation. Excavation should ensure the stability of the environment and reduce disturbance. (4) The excavated soil should be transported away as soon as possible. If the soil is transported, walked, or pulled through the foundation pit, an appropriate distance should be maintained. On the one hand, it is helpful for personal safety, and on the other hand, it ensures that the slope is not affected. (5) After the foundation pit excavation work is completed, it needs to be discussed and inspected by designers, supervisors, and other parties, and it should be written down. If it is found that the completed work and specifications are inconsistent with or deviate from the local capacity, the relevant personnel must be urged to solve the problem in a timely manner. , only foundation pits that pass the inspection can enter the next process.

3.5 Stone excavation project

3.5.1 Preparation work for stone excavation Check the preparation status of stone excavation and stone transport tools, and complete the plan design of stone excavation construction.

3.5.2 Process flow: Determine the sequence and slope of excavation → cut out the groove edge outline along the gray line → cloth eyelet → charge and blast → excavation → slag removal → inspection and acceptance → cleaning.

3.5.3 Construction points: (1) Stone excavation. According to the expression in the design specifications, gunpowder and manual excavation can be used during the operation. However, care must be taken not to cause loosening of the soil, squealing, and uneven surfaces. After the excavation of stonework is completed, channel support is carried out. (2) During stone excavation, you will find areas with special locations and weak soil. These areas require secondary care and reinforcement will begin after approval by the supervisor. (3) According to the actual construction schedule arrangement, it is best to ensure that the excavation of the stone is completed while finding appropriate sand and gravel raw materials. Once the excavation is confirmed, the mortar masonry process can be completed.

3.6 Earthwork backfilling

3.6.1 Process flow: Determine the backfilling sequence → layered backfilling and compaction (according to backfill depth requirements).

3.6.2 Quality requirements for backfill earthwork: ① Remove accumulated water and debris at the base of the fill. ② Silt and silty soil generally cannot be used as filler. ③Gravel soil, sand and blasting ballast can be used as filler below the surface. ④Clay with moisture content that meets compaction requirements can be used as filler for each layer.

Turf Slope Protection Project

4.1 Turf Slope Protection Construction Process: Construction Preparation → Dam Slope Regulation → Turf Construction → Trimming and Cleaning → Acceptance

4.2 Turf Slope Protection Should The slope surface will be renovated first, and according to the geographical location of the project, a fast-growing low steel-cropped turf will be selected.

Submersible pump installation project

5.1 Before installing the submersible pump, you should observe whether the cable is in good condition, whether it is loose, whether there is leakage, whether the resistance effect is satisfactory, and whether it has been completed. The installation of safety devices ensures that each water pump can be reliably grounded, and there are obvious signs to check whether the voltage value is normal. Otherwise, the service life will be reduced and the damage rate will be high.

5.2 Install the conveying pipe and fix it carefully. Add a rope to the handle for easy movement. Do not use cables as lifting tools. When working underwater, you must pay attention to waterproofing to prevent the filter from being damaged. Impurities get stuck and affect the effective working of the water pump.

5.3 It should be ensured that there is enough water space for the submersible pump to work. It should be constructed below the water surface to avoid being out of water. Otherwise, the heat may not be transferred out and cause damage to the system. However, if it is stopped, it must be cleaned. Then dry and park.

Technical Measures for Construction Safety in Rainy Season

6.1 To prevent electric shock, the "three-phase five-wire system" is implemented. Bare wires and plastic wires are not allowed to be used in power cords, and they are not allowed to be laid along the ground. The distribution box must be standardized and rainproof. The structure and status of the components must be complete and normal to prevent leakage. The electromechanical devices must be grounded and equipped with leakage protection devices. If the operator wants to operate, he must wear protective and insulating equipment.

6.2 To protect against lightning strikes, tower cranes, tic-tac-toe gantry scaffolding, etc. that are higher than the building should be equipped with lightning protection devices. Both sides of foundation pits, trenches, and ditches should be graded according to regulations. Dangerous areas should be stabilized and drainage should be paid attention to. When crisis situations are discovered, personnel should be mobilized to leave the site and the risks should be eliminated before starting operations. Pay attention to the professionalism of equipment during installation.

Conclusion

In short, farmland water conservancy project, as one of the important contents of rural reform, has also achieved obvious achievements. As an important means of production, water conservancy project also includes ordinary buildings. It has natural properties and is an important aspect of man-made engineering. The construction organization design of farmland water conservancy projects includes the basis for preparation; project overview; construction organization and management agencies; construction conditions; general construction layout; overall construction plan; foundation treatment; stone filling; overall construction progress plan; construction machinery and equipment manpower ; Quality assurance measures; Measures to ensure safe production; Civilized construction and environmental protection measures.

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