CN219431796U - Well flushing device suitable for deep foundation pit excavation tubular well dewatering - Google Patents

Abstract

The utility model discloses a well flushing device suitable for dewatering of a deep foundation pit excavation pipe well, which relates to the technical field of deep pit excavation and comprises a well wall pipe arranged in a drill hole, a filter material layer arranged between the outer side of the well wall pipe and a hole wall, a drain pipe arranged in the well wall pipe and used for discharging flushing sewage, and an air supply pipe arranged at the inner lower end of the well wall pipe and communicated with the drain pipe and used for supplying air. According to the utility model, wind pressure is sent to the bottom of a pipe well by using the wind sending pipe, meanwhile, an external clear water pipe is injected, the wind pressure drives bottom sludge to be discharged from a drain pipe, well flushing is stopped when clear water overflows, after well flushing is completed, a well flushing device is pulled out, a deep well water pump is lowered to drain water outwards, groundwater is forced to flow into a dewatering well in an accelerating mode, and the groundwater in a deep foundation pit is rapidly discharged. The well flushing device is simple, low in cost and large in precipitation depth, ensures the excavation progress of the deep foundation pit, and effectively improves the construction efficiency; the problems of poor dewatering well flushing effect, time and labor waste of a tube well in the existing deep foundation pit excavation are solved.

Description

Well flushing device suitable for deep foundation pit excavation tubular well dewatering

Technical Field

The utility model relates to the technical field of deep foundation pit excavation dewatering, in particular to a well flushing device suitable for deep foundation pit excavation pipe well dewatering.

Background

At present, deep foundation pit dewatering can adopt deep well reinforcement cage dewatering or light well point dewatering and the like, well point pipes (filter pipes are arranged at the lower end) are buried into the foundation pit water-containing layer at certain intervals along the periphery or one side of the foundation pit, the upper parts of the well point pipes are connected with a main pipe, groundwater is introduced into a well pipe through the filter pipes by using pumping equipment, and the groundwater is continuously pumped out through the main pipe, so that the groundwater level is lowered below the pit bottom. Although the two methods are common construction methods, the two precipitation modes have the defects that: firstly, the deep well reinforcement cage precipitation requires high soil permeability coefficient, the water pump requires high energy consumption; and the light well-point precipitation depth is generally not more than 5m, and the application range is small. Due to the shortage of the excavation period of the deep foundation pit by the subway open cut method, the conventional deep foundation pit excavation precipitation method influences the excavation progress of the deep foundation pit.

In addition, in the construction of the two methods, the importance of well flushing is often ignored, or the cleaning is incomplete, the method is improper, a filter screen or nylon cloth filter hole is blocked, the water seepage effect is poor, the quality and the progress of the whole deep foundation pit excavation are affected, and the efficiency is low.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a well flushing device which is suitable for deep foundation pit excavation pipe well dewatering and has good well flushing and dewatering effects and can effectively improve construction efficiency.

The technical scheme adopted for solving the technical problems is as follows: the well flushing device suitable for deep foundation pit excavation tube well dewatering comprises a well wall tube arranged in a drilling hole, a filter material layer arranged between the outer side of the well wall tube and a hole wall, a drain pipe arranged in the well wall tube and used for discharging flushing sewage, and an air supply tube arranged at the inner lower end of the well wall tube and communicated with the drain pipe and used for supplying air.

Further, the upper end of the sewage pipe is also connected with a deslagging hose, and one side of the drill hole is provided with a sedimentation tank for receiving sewage in the deslagging hose.

Further, the blow-off pipe comprises an air supply interface pipe and a blow-off pipe section, the air supply interface pipe is of a three-way structure, and the blow-off pipe section and the air supply pipe are respectively communicated with the air supply interface pipe.

Further, the sewage pipe sections are multiple, a flange is arranged at each end of each sewage pipe section, and two adjacent sewage pipe sections are connected through the flange.

Further, the specification of the drain pipe is 200mm of closed steel pipe, and the specification of the deslagging hose is 200mm.

Further, the filter material layer is formed by filling sand gravel filter materials.

Further, the well wall pipe is a steel floral pipe, and the specification of the steel floral pipe is 800mm.

Further, the upper end of the air supply pipe is also connected with an air compressor.

Further, the air supply pipe is a hose, and the specification of the air supply pipe is 50mm.

This well flushing device suitable for deep basal pit excavation tube well dewatering, including well wall pipe, filter material layer, blow off pipe and blast pipe, through adopting the rig pore-forming of digging soon, the well wall pipe installation, the filter material layer fills and forms tube well dewatering structure, blast pipe lower extreme and blow off pipe lower extreme intercommunication, and certain wind pressure is sent out through the blast pipe, rolls the dregs of tube well structure bottom to the top, through the automatic come-up of blow off pipe to the well head, the external pipeline of blow off pipe discharges appointed position, like the sedimentation tank can. According to the utility model, a casing pipe is buried in the deep foundation pit, a closed steel pipe is adopted in the range of 1m below the original ground and in the range of 1m below the foundation pit bottom, wind pressure is sent to the bottom of the casing pipe by using a wind pipe, meanwhile, an external clear water pipe is injected, the wind pressure drives bottom sludge to be discharged from a blow-off pipe, well flushing is stopped when clear water overflows, after well flushing is completed, a well flushing device is pulled out, a deep well water pump is lowered to drain water outwards, groundwater is forced to flow into a dewatering well in an accelerating mode, and the groundwater in the deep foundation pit is rapidly discharged. The well flushing device is simple, low in cost and large in precipitation depth, ensures the excavation progress of the deep foundation pit, and effectively improves the construction efficiency; the problems of poor dewatering well flushing effect, time and labor waste of a tube well in the existing deep foundation pit excavation are solved.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic structural diagram of a well flushing device suitable for dewatering a deep foundation pit excavation pipe well according to an embodiment of the utility model.

Reference numerals illustrate:

1. an air supply interface tube; 2. a steel floral tube; 3. an air supply pipe; 4. a flange plate; 5. a blow-down pipe; 6. a filter material layer; 7. an air compressor; 8. a sedimentation tank; 9. and a slag discharging hose.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

As shown in figure 1, the well washing device suitable for deep foundation pit excavation tube well dewatering comprises a well wall tube, a filter material layer 6, a drain pipe 5, a deslagging hose 9, an air supply tube 3 and an air compressor 7, wherein the well wall tube is arranged in a drilled hole, and the filter material layer 6 is filled between the outer side of the well wall tube and the wall of the hole. In this embodiment, the casing is a steel pipe 2, and the specification of the steel pipe 2 is 800mm, however, in other embodiments, other specifications may be used. The filter layer 6 is filled with a sand gravel filter material, and of course, the material is not limited to the sand gravel filter material, and the filter material can be commonly used in engineering as long as the filter material can play a role in filtration.

The blow off pipe 5 is located the inside well wall pipe and is used for discharging well flushing sewage, and blow off pipe 5 includes air supply interface pipe 1 and blow off pipe section, air supply interface pipe 1 is three-way structure, and blow off pipe section and blast pipe 3 communicate air supply interface pipe 1 respectively, and blast pipe 3 are used for supplying air to blast pipe 3 upper end is connected with air compressor machine 7. In this embodiment, the air supply pipe 3 is a hose, and the specification of the air supply pipe 3 is preferably 50mm.

The sewage pipe sections are multiple, each sewage pipe section end is provided with a flange 4, and two adjacent sewage pipe sections are connected through the flange 4. The specification of the blow-down pipe 5 is a 200mm closed steel pipe.

In order to further discharge the well-flushing sewage to the planned position, the upper end of the sewage pipe 5 is connected with a deslagging hose 9, and one side of the drilled hole is provided with a sedimentation tank 8 for receiving the sewage in the deslagging hose 9. In the embodiment, the sedimentation tank 8 is a three-stage sedimentation tank 8, and the specification of the deslagging hose 9 is preferably 200mm.

Through adopting the rotary drilling rig pore-forming, steel flowtube 2 installation, filter material layer 6 fills forms the well dewatering structure, adopt closed 200mm steel pipe that ring flange 4 connects to constitute blow off pipe 5, reuse 50mm hose and air supply interface pipe 1 firm in connection guarantee not leak gas, whole car hangs and transfers into the well bottom, unsettled 20cm, upper portion consolidates blow off pipe 5 way, the hose is connected with air compressor machine 7, through sending out certain wind pressure, roll the dregs of well bottom to the top, automatic come-up to the well head through blow off pipe 5, external heavy-calibre hose discharges tertiary sedimentation tank 8.

The deep foundation pit pipe well dewatering adopts a steel pipe 2 to be buried, a 1m range below the original ground and a 1m range at the bottom of the foundation pit adopt sealed steel pipes, air pressure of an air compressor 7 is used for conveying the air pressure to the bottom of the pipe well, meanwhile, an external clear water pipe is used for injecting, the air pressure drives bottom mud slag to be discharged from a blow-off pipe 5, well flushing is stopped when clear water overflows, after well flushing is completed, a well flushing device is pulled out, a deep well water pump is lowered to drain water outwards, groundwater is forced to flow into a dewatering well in an accelerating manner, and the groundwater in the deep foundation pit is discharged rapidly. The problems of poor dewatering well flushing effect, time and labor waste of a tube well in the existing deep foundation pit excavation are solved.

The specific working method of the well flushing device is as follows: in the concrete implementation, firstly, a blow-off pipe 5 with the diameter of 200mm is arranged on site, the air supply interface pipe 1 is respectively connected with the air supply pipe 3 and the blow-off pipe section, and the air supply interface pipe 1 is communicated with the bottom of the blow-off pipe 5. During well flushing, the air supply pipe 3 is connected with the air compressor 7, the test operation is performed to check the sealing condition, the automobile crane is integrally lifted into the pipe well, small wind pressure is firstly used for supplying air for 2min, sediment at the bottom of the pipe well is flooded, clear water is injected simultaneously, the water level is ensured to float up and down at the orifice of the pipe well, then the large wind pressure starts a pollution discharge mode, sediment and sewage are discharged until the clear water is discharged, the well flushing is finished, a well flushing device is called out, a submersible pump is installed for dewatering construction, surrounding underground water enters the 800mm pipe well after being filtered by sand and stone under the pressure effect, the water enters a dewatering well, then the foundation pit is pulled out, the excavation face is always kept dry in the process circulation, no water is accumulated in the foundation pit, and the excavation efficiency is improved on the premise of ensuring the quality.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (9)

1. The well flushing device suitable for deep foundation pit excavation tube well dewatering is characterized by comprising a well wall tube arranged in a drilling hole, a filter material layer (6) arranged between the outer side of the well wall tube and a hole wall, a drain pipe (5) arranged in the well wall tube and used for discharging well flushing sewage, and an air supply tube (3) arranged at the inner lower end of the well wall tube and communicated with the drain pipe (5) and used for supplying air.

2. The well flushing device suitable for deep foundation pit excavation tube well dewatering according to claim 1, wherein the upper end of the blow-down pipe (5) is further connected with a slag discharging hose (9), and a sedimentation tank (8) for receiving sewage in the slag discharging hose (9) is arranged on one side of the drill hole.

3. The well flushing device suitable for deep foundation pit excavation pipe well dewatering according to claim 2, wherein the blow-down pipe (5) comprises an air supply interface pipe (1) and a blow-down pipe section, the air supply interface pipe (1) is of a three-way structure, and the blow-down pipe section and the air supply pipe (3) are respectively communicated with the air supply interface pipe (1).

4. A well flushing device suitable for deep foundation pit excavation pipe well dewatering according to claim 3, wherein a plurality of drain pipe sections are provided, each drain pipe section end is provided with a flange plate (4), and two adjacent drain pipe sections are connected through the flange plate (4).

5. The well flushing device suitable for deep foundation pit excavation pipe well dewatering according to any one of claims 2-4, wherein the drain pipe (5) is a closed steel pipe with a specification of 200mm, and the deslagging hose (9) is a specification of 200mm.

6. Well-flushing device suitable for deep foundation pit excavation tubular well dewatering according to any of claims 1-4, characterized in that the filter layer (6) is of sand gravel filter packing construction.

7. The well flushing device suitable for deep foundation pit excavation pipe well dewatering according to any one of claims 1-4, wherein the well casing is a steel flowtube (2), and the steel flowtube (2) has a specification of 800mm.

8. The well flushing device suitable for deep foundation pit excavation pipe well dewatering according to any one of claims 1-4, wherein the upper end of the blast pipe (3) is also connected with an air compressor (7).

9. The well flushing device suitable for deep foundation pit excavation pipe well dewatering according to claim 8, wherein the blast pipe (3) is a hose, and the blast pipe (3) has a specification of 50mm.