4.1 construction preparation
4.1.1 pumping station before installation should do some work.
4.1.2 pumping station construction area of the drainage system, construction planning should be arranged according to the area topography, meteorological and hydrological, geological conditions, drainage volume, and adapt to outside drainage system. Ditch should be set on the periphery of the foundation pit.
4.1.3 before pumping equipment installation, must study the mechanical and electrical equipment installation drawings, construction technology of using the determined pump, electrical equipment, in the construction process, must establish a complete construction quality inspection procedures and control measures. Construction and installation of integrated prefabricated pumping station
4.1.4 site equipment, tools and construction materials should be placed neatly, the site is clean and smooth.
Buried construction signs and observation instruments should be 4.1.5 before construction. Construction should be on-site observation and recording.
4.2 pump pit excavation
The 4.2.1 shall have a pump pit excavation plan and shall be excavated in strict accordance with the plan.
The excavation section of 4.2.2 foundation pit should meet the requirements of design, construction and stability of foundation pit slope.
4.2.3 pump pit bottom should take precipitation measures.
4.2.4 to take appropriate foundation pit support, to avoid the pump pit collapse.
After the end of the 4.2.5 pump pit excavation, confirm the pump inlet and outlet pipes and cables and other on-site conditions, in order to pump installation.
4.3 concrete floor installation
4.3.1 bottom shall be flat, and should be covered with a layer of 10mm thick gravel layer.
4.3.2 concrete foundation can be directly installed in the bottom pouring preset construction, or directly pouring in compacted layer.
4.3.3 is installed on the cement floor of the anchor bolt should precede the pump installation.
4.3.4 cement floor level. The upper plane of the floor must be polished.
4.3.5 anchor bolts in a circle of uniform angle installation.
4.4 pumping station hoisting
4.4.1 lifting lasso pumping station from a horizontal position to a vertical position. In this stage, the casing of the hook is not allowed.
4.4.2 prefabricated vertical lifting pump, hook force should be uniform. To use the lifting rope to protect the lasso or pumping station and pump cover to avoid bad clip.
4.4.3 place, the application of brush clean cement floor surface, ensure that no dirt and other debris between the mounting surface and the pump mounting flange.
The inlet and outlet direction of the pump station should be consistent with the direction of inlet and outlet when the 4.4.4 pump station is hoisted.
4.4.5 pump should be installed vertically, and fixed screws.
4.5 pump pit backfill and compaction
4.5.1 pump pit backfill should be installed in the pump station after the correct.
4.5.2 backfill material should be gravel, stone sand, gravel soil, sand, particle size should not exceed 13 ~ 25mm.
4.5.3 backfill should be layer by layer backfill, the height of each layer shall not exceed 30cm, backfill compaction should comply with the design requirements and the construction of foundation engineering construction quality acceptance specification GB50202 6.3.
Backfill in the inlet and outlet pipes of the 4.5.4 pit shall be compacted. The backfill layer to the pump cylinder from the top surface of the 30cm, prohibited the use of rammed earth machine.
4.5.5 backfill quality inspection shall comply with the provisions of the "code for acceptance of construction quality of building foundation engineering" GB50202 and the "standards for quality inspection and assessment of building engineering" GB50300.
4.6 debugging
4.6.1 the following checks should be performed before commissioning:
1 settings, installation is correct;
2 may produce a vacuum pipeline, vacuum damage valve should have sufficient flow area, the action should be accurate and reliable;
3 inlet and outlet pipe on the valve should be fully open, other devices should be in normal working condition.
4.6.2 mechanical and electrical equipment installation, commissioning of the necessary power supply capacity, voltage rating, electrical protection devices should meet the requirements of the installation of mechanical and electrical equipment.
4.6.3 pump station commissioning in accordance with the relevant national standards for the construction of the acceptance, the commissioning phase.
4.6.4 pump commissioning shall comply with the following requirements:
1 fastening the fastening parts;
2 rotor and the movement of the normal operation, no abnormal sound and friction;
3 the operation of the auxiliary system is normal, the pipeline connection is solid without leakage;
4 pump safety protection and electronic control devices and parts of the instrument are sensitive, correct and reliable.
4.6.5 pump station with quick stop gate breaking and its downstream side also has emergency gate, should adjust its automatic control linkage with time meet the design requirements of generator protection, on-site operation and reliable remote control. Construction and installation of integrated prefabricated pumping station