CN202247920U - Construction structure for water drainage of blind ditch and water collecting wells in deep foundation pit - Google Patents

Abstract

The utility model discloses a construction structure for drainage of blind ditches and water collection wells in deep foundation pits. Arranged in parallel, lay stone layers, debris layers and colored strips in sequence from bottom to top in the blind ditch, dig a number of water collection well pits in the foundation pit, and lay bricks on the bottom wall of the water collection well pits. The side wall of the water collection well is surrounded by the side wall of the water collection well to form a water collection well. The space between the outer wall of the water collection well and the inner wall of the water collection well pit is filled with gravel, and a round casing is installed at the closing position of the top of the water collection well. The ditch is connected to each water collection well through an inclined conduit. Between the top wall of the pits of multiple water collection wells and the top surface of the color strip cloth part, a cushion layer, a waterproof layer and a waterproof layer are laid sequentially from bottom to top. The protective layer. Adopting this structure can effectively solve the problem that the terrain is high in the north and low in the south, and both surface water and groundwater on the north side flow into the foundation pit.

Description

A drainage construction structure of blind ditch and water collection well in deep foundation pit

technical field

The utility model relates to a construction method for drainage in deep foundation pits, in particular to a construction method for drainage of blind ditches and water collection wells in deep foundation pits.

Background technique

With the development of urban construction, a large number of high-rise buildings, civil air defense projects and subway projects have emerged. The success of foundation pit support directly affects the benefit and success of engineering construction. As the environmental factor of rock and soil mass, groundwater often has a negative impact on foundation pit engineering. For areas with a high groundwater level, a large area of temporary precipitation and water stop is required during foundation pit excavation. If the groundwater in the foundation pit is not properly treated, it is easy to cause accidents such as foundation pit collapse and ground subsidence. In the excavation and basement construction of deep foundation pit engineering, it is necessary to ensure that the construction is in a "dry" state. To solve this problem, the methods usually adopted are: water stop, precipitation and drainage. The water stop is in the form of a water stop curtain, the purpose of which is to block the infiltration of external water from the foundation pit. Precipitation is to keep the groundwater level below 0.5 to 1.0 meters below the bottom of the foundation pit, which is convenient for excavation and floor dry operations. The methods of precipitation include light well points, jet well points, electroosmotic well points, tube well points, etc.; The surface water and groundwater in the pit range are drained, and the way of intercepting ditch-collecting well is often used for clear drainage. There are many construction methods for intercepting ditch-water collection well. However, at present, the terrain is high in the north and low in the south, both the surface water and groundwater on the north side flow into the foundation pit, and because the prestressed anchor cable penetrates the water-stop curtain, the groundwater on the north side flows into the foundation pit through the free section. Moreover, the net distance between the edge of the enclosure pile on the north side of the site and the edge of the floor brick membrane is too small, and the drainage requirements of the open ditch of the foundation pit cannot be guaranteed here.

Authorized patents obtained by searching:

1 The Chinese patent with the application number CN200820062278.1 discloses "recoverable percussion drilling steel pipe dewatering well", wherein the body of the recyclable percussion drilling steel pipe dewatering well is composed of standard steel pipe sections, and the standard steel pipe sections are welded to adjacent pipes The wall ends are connected, the number of standard steel pipe sections is 2 to 4, the recyclable percussion drilling steel pipe precipitation well is vertically arranged under the ground, the upper end of the precipitation well and the lower end of the precipitation well are open, and a submersible pump is installed at the lower end of the precipitation well. What this patent discloses is the structure of the recyclable percussion drilling steel pipe dewatering well. What this patent discloses is a construction method for drainage of blind ditch and water collection well in deep foundation pits. It is also similar to the blind ditch and water collection well structure described in this patent. different.

2 The Chinese patent application number CN201020666433.8 discloses an "odor-proof water collection well cover", which comprises a ring body, a flapper pin, a baffle plate and a flapper weight body. The ring body is the main part, and the shape of the ring body can be set according to the form of the head of the water collection well, so it can be square or circular. The two ends of the flapper pin are penetrated and fixed on the inner wall of the ring body, the upper end of the baffle is provided with a through hole for penetrating the flapper pin, and the through hole at the top of the baffle is penetrated and hung on the flapper pin . The baffle is inclined, and the rear side of the upper end of the baffle is connected with a flapper weight body. Under the action of the drooping force of the flapper weight, the lower end of the baffle will automatically lift up and contact the front flapper weight. According to this, under the gravitational action of the flapper weight body, the baffle plate will cooperate with the flapper weight body to seal the mouth of the water collection well and prevent the smell from rising. If there is rainwater to press down, the downward pressure will overcome the drooping gravity of the hammer body of the flapper, so that the lower end of the baffle plate is moved downward, and the baffle plate is opened, so that the rainwater is discharged.

3 The Chinese patent with the application number CN201110002790.3 discloses the "Method and Device for Drainage and Drainage of Blind Ditch Water Collection Wells in Deep Foundation Pit". This method concentrates the accumulated water on the outside of the basement exterior wall into the blind ditch pipe at the lower part of the basement floor through the intercepting ditch. , the accumulated water in the basement flows into the blind ditch pipe at the lower part of the floor through the drain hole, and then is led to the temporary water collection well through the blind ditch pipe, and is discharged by the water pump.

4 The Chinese patent with the application number CN201020645284.7 discloses "a water collection well system used in the construction process of foundation pit retaining wall drainage". The water collection well system includes a water collection well body and at least one A downwater pipe, and a water suction pipe with one end arranged in the downwater pipe and the other end connected to the water pump; a downwater hole is arranged on the side wall of the downwater pipe, and a filter layer is arranged around the downwater pipe.

5. The Chinese patent application number CN201020252346.8 discloses a "dual water collection well basement drainage system", which includes a water collection well I near the basement and a water collection well II near the municipal drainage pipe network. The bottom of the water collection well I and The bottom of the water collection well II is connected by a connecting pipe. An overflow port is arranged on the water well wall of the water collection well II. The pipe is an inverted U-shaped PVC pipe. One end of the PVC pipe is set at the bottom of the water collection well I, and the other end is set at the water collection well. The bottom of II forms a communicator structure.

The drainage construction methods of the above-mentioned 2-5 patents have a series of advantages, but they are not suitable for the terrain that is high in the north and low in the south, and both surface water and groundwater on the north side flow into the foundation pit. The side groundwater flows into the foundation pit through the free section. Moreover, the net distance between the edge of the enclosure pile on the north side of the site and the edge of the floor brick membrane is too small to ensure the drainage requirements of the open ditch of the foundation pit.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a construction structure for drainage of blind ditches and water collection wells in deep foundation pits that can effectively ensure the drainage requirements of foundation pits.

The utility model relates to a construction structure for drainage of blind ditches and water collection wells in deep foundation pits. The side walls are arranged in parallel, and the flake layer, the fragment layer and the colored strip cloth are successively laid in the blind ditch from bottom to top, and a plurality of water collection wells parallel to the blind ditch and arranged at intervals are dug in the foundation pit , bricks are paved on the bottom wall of each of the well pits of the water collection wells and arc-shaped side walls of the water collection wells are enclosed in the well pits of the water collection wells to form a water collection well, and the outer walls of the water collection wells are connected with the water collection well The inner wall of the pit is filled with gravel, and a circular casing is installed at the closing position of the top of the water collection well, and a steel plate waterstop ring is welded around the circumference of the circular casing. The bottom surface of the steel plate water stop ring is symmetrically welded with at least four steel bars, and the at least four steel bars are supported on the top wall of the water collection well, and the blind ditch and each water collection well are connected by an inclined The conduits are connected and arranged, and a cushion layer, a waterproof layer and a waterproof protective layer are sequentially laid from bottom to top between the top wall of the plurality of water collection wells and the top surface of the color strip cloth part.

Adopting the structure of the utility model has low cost, strong integrity, strong applicability, good stability and high reliability; it can effectively solve the problem that the terrain is high in the north and low in the south, and both surface water and groundwater on the north side flow into the foundation pit, and can solve the problems caused by The prestressed anchor cable penetrates the water-stop curtain, the groundwater on the north side flows into the foundation pit through the free section, and the net distance between the edge of the surrounding pile on the north side of the site and the edge of the floor brick membrane is too small to ensure the drainage requirements of the foundation pit's open drainage ditch.

Description of drawings

Fig. 1 is a structural top view of a blind ditch in a deep foundation pit and a water collection well drainage construction structure of the present utility model;

Fig. 2 is a longitudinal sectional view of the structure shown in Fig. 1;

Fig. 3 is the structural representation of casting base plate on the basis of the structure shown in Fig. 2;

Fig. 4 is a schematic diagram of the casing part in the structure shown in Fig. 2;

FIG. 5 is a top view of the bushing portion shown in FIG. 4 .

Detailed ways

Below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described:

As shown in the figure, a construction structure of blind ditch and water collection well drainage in a deep foundation pit, it includes a blind ditch 1 arranged on the low side of the excavated foundation pit, and the blind ditch 1 is connected to the low side of the terrain. The side walls of the foundation pit are arranged in parallel, and the flake layer 1-3, the debris layer 1-2 and the color strip cloth 1-1 are successively laid in the blind ditch from bottom to top. The blind ditch of the water-collecting well pits 4 arranged in parallel and at intervals, bricks are paved on the bottom wall of each of the water-collecting well pits and an arc-shaped water-collecting well side wall 4-1 is formed in the water-collecting well pits The water collection well is filled with gravel 6 between the outer wall of the water collection well and the inner wall of the water collection well pit, and a circular casing 13 is installed at the closing position of the top of the water collection well. A steel plate water stop ring 10 is welded around the circumference of the circular sleeve, and at least four steel bars 12 are symmetrically welded on the bottom surface of the steel plate water stop ring, and the at least four steel bars are supported on the top of the water collection well. On the wall, the blind ditch 1 and each water collection well 4 are communicated through an inclined conduit 2, between the top wall of the plurality of water collection wells and the top surface of the color strip cloth part A cushion layer 7, a waterproof layer 8 and a waterproof protective layer 9 are laid in sequence from bottom to top. 3 is the surrounding protection pile of foundation pit among the figure.

The operation method of this structure is as follows: put the water pump 11 into each water collecting well, and pump water according to the water level; The casing 13 on the well is fully welded and sealed with a round steel plate 14 and the base plate reinforcement is bound on the waterproof protection layer, and the base plate concrete 5 is poured.

Claims (1)

1. A construction structure for blind ditch and water collection well drainage in a deep foundation pit is characterized in that: it comprises a blind ditch arranged on the low side of the ground in the dug foundation pit, and the blind ditch is connected with the low side of the ground The side walls of the foundation pit are arranged in parallel, and in the blind ditch, a layer of rubble, a layer of fragments, and colored strips are laid sequentially from bottom to top, and a plurality of water collection wells parallel to the blind ditch and arranged at intervals are dug in the foundation pit Well pits, bricks are laid on the bottom wall of each of the well pits of the water collection wells, and arc-shaped side walls of the water collection wells are enclosed in the well pits of the water collection wells to form a water collection well. The inside wall of the water well pit is filled with gravel, and a circular casing is installed at the closing position of the top of the water collection well, and a steel plate water-stop ring is welded around the circumference of the circular casing. The bottom surface of the steel plate water stop ring is symmetrically welded with at least four steel bars, and the at least four steel bars are supported on the top wall of the water collection well, and there is a bridge between the blind ditch and each water collection well The inclined conduits are connected to each other, and a cushion layer, a waterproof layer and a waterproof protective layer are sequentially laid from bottom to top between the top walls of the plurality of water collection wells and the top surface of the color strip cloth part.

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