CN205314117U - Foundation structure that draw water is carried out with centrifugal pump - Google Patents

Abstract

A foundation structure for pumping water with a centrifugal pump, comprising a cast-in-place pile hole, a centrifugal water pump, a water delivery hose, a liquid level relay and a water-permeable hole wall protection device; the water-permeable hole wall protection is inserted into the hole wall of the cast-in-place pile device; the centrifugal water pump is installed in the cast-in-place pile hole, and the centrifugal water pump is connected with a liquid level relay to control its opening; the water delivery hose is connected with the centrifugal water pump. The structure can lower the groundwater level by more than 20m at one time, which can improve work efficiency, save energy and protect the environment, and reduce project cost.

Description

A foundation structure for pumping water with a centrifugal pump

technical field

The utility model belongs to the technical field of underground water level engineering, in particular to a foundation structure for pumping water with a centrifugal pump.

Background technique

At present, for projects that need to lower the groundwater level, construction units mainly use the following three dewatering methods: 1. Open ditch method (suitable for shallow groundwater drainage); 2. Light well point dewatering method (suitable for drainage depths less than 3 to 5m) Or groundwater within the range of 6-9m, and soil with a permeability coefficient of 0.1-50m/d); 3. Jet well point method; 4. Electroosmotic drainage method, etc. Commonly used is the light well point precipitation method.

In order to insert a well-point pipe with a length of 7-8m and a diameter of 51-63mm into the soil of the aquifer, it is necessary to flush the soil with high-pressure water before excavating the foundation pit and sink the well-point pipe in the aquifer by its own weight. , the water pressure is generally 400-700kPa, the punching diameter is generally about 30cm, and the hole wall and the pipe are filled with clean coarse sand as a sand filter layer. At a depth of about 1m from the ground, use clay to seal and tamp to prevent air leakage and ensure a high degree of vacuum at the well point. Therefore, this method has high cost, long construction time and laborious effort, and the foundation structure is not prone to failure.

Contents of the invention

The purpose of the utility model is to provide a foundation structure for pumping water with a centrifugal pump, which can lower the groundwater level by more than 20m at one time, improve work efficiency, save energy and protect the environment, and reduce construction cost.

As conceived above, the technical solution of the utility model is: a foundation structure for pumping water with a centrifugal pump, which is characterized in that it includes a cast-in-situ pile hole, a centrifugal water pump, a water delivery hose, a liquid level relay and a water-permeable hole wall protection device; A permeable hole wall protection device is inserted into the hole of the cast-in-place pile along the hole wall; the centrifugal water pump is installed in the hole of the cast-in-place pile, and the centrifugal water pump is connected with a liquid level relay to control its opening; the water delivery hose and the centrifugal water pump connect.

The above-mentioned water-permeable hole wall protection device adopts a steel cage to outsource the water-permeable geotextile.

The above-mentioned permeable hole wall protection device adopts a polyvinyl chloride water pipe, and the pipe wall of the water pipe is perforated and covered with a water-permeable geotextile.

The utility model has the following advantages and positive effects:

1. The utility model sets cast-in-situ pile holes at the required positions, and uses mud and permeable hole wall protection devices to protect the walls, which can save the backfilling of clean coarse sand between the pipe wall and the pipe, and save the clay about 1m away from the ground. The sealing layer, the well pipe made of seamless steel pipe and the filter pipe and all processing and methods related to the filter pipe are omitted.

2. The utility model uses a centrifugal water pump, a water delivery hose, and a liquid level relay to control the water level to pump water instead of a vacuum pump device, which can save energy, cost and labor, and the foundation structure is not prone to failure.

3. The utility model can be widely used in deep and shallow foundations, not affected by the size of the foundation pit, and structures that need to lower the groundwater level by more than 20m, such as high-rise building basements, dumping machine rooms, large sewage treatment pools and other projects.

Description of drawings

Fig. 1 is the top view during construction of the utility model;

Fig. 2 is the front view during construction of the utility model.

In the figure 1. is the cast-in-situ pile hole; 2. is the permeable hole protection wall device; 3. is the mud layer; 4. is the water delivery hose; 5. is the centrifugal water pump; 6. is the liquid level relay; 7. is the foundation pit.

detailed description

Below in conjunction with accompanying drawing, the foundation structure of lowering groundwater level of the present utility model is illustrated.

As shown in Figures 1 and 2: a foundation structure for pumping water with a centrifugal pump, including a cast-in-situ pile hole 1, a centrifugal water pump 5, a water delivery hose 4, a liquid level relay 6 and a water-permeable hole wall protection device 2. A water-permeable hole wall protection device is inserted into the cast-in-place pile hole along the hole wall; the centrifugal water pump is installed in the cast-in-place pile hole, and the centrifugal water pump is connected with a liquid level relay to control its opening; the water delivery hose and the centrifugal water pump connect.

The above-mentioned water-permeable hole wall protection device adopts a steel cage to outsource the water-permeable geotextile.

The above-mentioned permeable hole wall protection device adopts a polyvinyl chloride water pipe, and the pipe wall of the water pipe is perforated and covered with a water-permeable geotextile.

The construction process of the present utility model is: set the cast-in-place pile hole 1 around the foundation pit 7 that needs to lower the groundwater level according to the design requirements; The four sides of the pit form a zigzag shape, and the cast-in-place pile holes in the foundation pit can be arranged and drilled according to the required depth.

Just use mud layer 3 retaining wall when forming hole, the permeable hole retaining wall device 2 is inserted along cast-in-place pile hole wall; Centrifugal water pump 5 is put into cast-in-place pile hole after being connected with water delivery hose 4, and centrifugal water pump and Liquid level relay connection.

Turn on the centrifugal water pump, the level of groundwater (which was mud at the beginning) begins to drop, and the excavation work of the foundation pit can be carried out. As the excavation depth of the foundation pit increases, the pumping work continues and the groundwater level continues to drop. The cast-in-situ pile holes in the foundation pit must be protected from being damaged due to excavation and pumping continues until the required excavation depth of the foundation pit is reached. .

It is necessary to continue to pump water. When it is observed that the groundwater level is N=1~1.5m away from the bottom of the foundation pit, the water pump in the foundation pit can stop pumping; when the groundwater level rises to n=1m from the bottom of the foundation pit, it is necessary to start the centrifugal pump to pump water until The work in the pit is all over. If the bottom plate of the foundation pit is made of reinforced concrete, the pumping can be stopped only after the strength of the reinforced concrete reaches the predetermined strength, and the hole should be blocked according to the material required by the design.

Claims (3)

1. the foundation structure carrying out drawing water with centrifugal pump, it is characterised in that: include priming concrete pile hole, centrifugal water pump, delivery hose, liquid level relay and permeable holes protecting wall device; Permeable holes protecting wall device is inserted along hole wall in described priming concrete pile hole; Described centrifugal water pump is arranged in priming concrete pile hole, and centrifugal water pump is connected to control it and opens with liquid level relay; Described delivery hose is connected with centrifugal water pump.

2. a kind of centrifugal pump according to claim 1 carries out the foundation structure that draws water, it is characterised in that: above-mentioned permeable holes protecting wall device adopts steel reinforcement cage outsourcing infiltration geotextiles.

3. a kind of centrifugal pump according to claim 1 carries out the foundation structure that draws water, it is characterised in that: above-mentioned permeable holes protecting wall device adopts polyvinyl chloride pipe, outsourcing infiltration geotextiles that the tube wall of this water pipe punches.