CN219033271U

CN219033271U - Well point pipe dewatering system for water treatment of foundation pit of unsealed investigation hole

Info

Publication number: CN219033271U
Application number: CN202320224146.9U
Authority: CN
Inventors: 李玉灿; 彭伟; 董天林; 石军; 张阳
Original assignee: China Shipbuilding Industry Institute Of Engineering Investigation & Design Co ltd
Current assignee: China Shipbuilding Industry Institute Of Engineering Investigation & Design Co ltd
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-05-16
Anticipated expiration: 2033-02-14

Abstract

The utility model discloses a well point pipe dewatering system for water treatment of foundation pit water burst of unsealed investigation hole, which is characterized by comprising the following components: the system comprises an A well point pipe arranged in an unsealed investigation hole and a B well point pipe arranged in soil surrounding the unsealed investigation hole, wherein the B well point pipe and the A well point pipe are connected to a drainage main pipe provided with a vacuum pump through drainage branch pipes, so that local drainage and drainage of the unsealed investigation Kong Jikeng water burst are realized; the four B well point pipes are arranged on four corners of a square with an unsealed investigation hole as the center and the side length of 1.5 m; the A well point pipe is arranged at the center of the unsealed investigation hole. Compared with the prior art, the method has the advantages of convenient construction, quick precipitation, good treatment effect, capability of realizing well point precipitation quickly, solving the potential safety hazard, strong auxiliary precipitation method for foundation pit precipitation with potential upper and lower hydraulic connection channels, and certain popularization and application prospect.

Description

Well point pipe dewatering system for water treatment of foundation pit of unsealed investigation hole

Technical Field

The utility model relates to the technical field of foundation pit well point dewatering, in particular to a well point pipe dewatering system for foundation pit water treatment of an unsealed investigation hole.

Background

In the foundation pit engineering of a soft soil area with rich underground water, in order to facilitate earthwork excavation and anti-surging safety of the bottom of the foundation pit, dewatering design is often carried out, such as water-stop curtains, dry dredging wells, relief wells and the like, and dewatering is carried out according to requirements. When the design of the relief well is carried out, the pressure weight effect of the weakly permeable layer at the bottom of the foundation pit on the pressure-bearing water can be fully considered by the design party, and the requirement of the relief well for precipitation is based on the principle that the top plate of the weakly permeable layer is not broken down and precipitation is carried out as required. The underlying premise of the principle is that the weak water permeable roof is complete, and a potential hydraulic connection channel does not exist between the pressure-bearing water layer and the bottom of the foundation pit. If the missed unblocked or unblocked investigation holes exist in the field, the unblocked or unblocked investigation holes can be used as potential hydraulic communication channels between the bottom of the foundation pit and the bearing water layer, so that the potential safety hazard of foundation pit excavation is formed, and the potential safety hazard is sudden and is not enough to be worry.

Disclosure of Invention

The utility model aims to provide a well point pipe dewatering system for treating water gushing of an unsealed investigation hole foundation pit, which is designed aiming at the defects of the prior art, and adopts a mode that a reverse filtering layer is matched with local well point pipe dewatering to realize local drainage of water gushing of pressure-bearing water in a certain range and depth of the periphery of the unsealed investigation hole foundation pit, and the method specifically comprises the following steps: the hidden affected part is excavated and temporarily drained, the well point pipe is buried, the inverted filter is arranged and well point auxiliary precipitation is carried out, potential safety hazards can be rapidly solved, the method is a powerful auxiliary precipitation method for foundation pit precipitation of a submerged hydraulic connection channel and a submerged hydraulic connection channel, the construction is convenient, the precipitation is rapid, the treatment effect is good, and the method has a certain popularization and application prospect.

The specific technical scheme for realizing the utility model is as follows: the well point pipe dewatering system for the foundation pit water treatment of the unsealed investigation hole is characterized by comprising: the system comprises an A well point pipe arranged in an unsealed investigation hole and a B well point pipe arranged in soil surrounding the unsealed investigation hole, wherein the B well point pipe and the A well point pipe are connected to a drainage main pipe provided with a vacuum pump through drainage branch pipes, and water burst is discharged out of a foundation pit to realize local drainage and drainage of the water burst of the unsealed investigation Kong Jikeng; the four B well point pipes are arranged on four corners of a square with an unsealed investigation hole as the center and the side length of 1.5 m; the A well point pipe is arranged at the center of the unsealed investigation hole.

And the lower parts of the B well point pipe and the A well point pipe are provided with filter pipe sections wrapped by 80-mesh copper wire meshes.

Compared with the prior art, the utility model has the advantages of convenient construction, quick dewatering and good treatment effect, the well point pipe flower pipe filter head for well point dewatering adopts the long and short filter pipes, the top end of the well point pipe does not need to adopt clay or other sealing means, the utility model mainly dries the reverse filter layer to gather clear water, and takes into account the dewatering of soil in a certain depth range below the reverse filter layer, the reverse filter layer mainly plays a role in preventing the soil loss of a top plate, plays roles in pressing weight and catchment, can realize well point dewatering faster, solves the potential safety hazard, is a powerful auxiliary dewatering method for foundation pit dewatering with potential upper and lower hydraulic connection channels, and has a certain popularization and application prospect.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a schematic plan layout of embodiment 1;

fig. 4 is a sectional view of B-B of fig. 3.

Detailed Description

Referring to fig. 1 to 2, the present utility model includes: an A well point pipe 7 arranged in the unsealed investigation hole and a B well point pipe 5 arranged in soil surrounding the unsealed investigation hole, wherein the B well point pipe 5 and the A well point pipe 7 are connected to a drainage main pipe 10 provided with a vacuum pump 9 through a drainage branch pipe 11 to realize local drainage and drainage of water burst of the unsealed investigation Kong Jikeng; the A well point pipe 7 is arranged in the center of the unsealed investigation hole; the lower parts of the B well point pipe 5 and the A well point pipe 7 are provided with filter pipe sections 6 wrapped by 80-mesh copper wire meshes.

Referring to fig. 1, the four B-well point pipes 5 are arranged at four corners of a square with an unsealed survey hole as the center and a side length of 1.5 m.

The present utility model will be further described in detail by the following specific examples.

Example 1

Referring to fig. 3 to 4, the utility model adopts a square of a reverse filtering layer matched with partial well point pipe dewatering to realize partial drainage and drainage of unsealed investigation Kong Jikeng water burst, and specifically comprises the following steps:

a step: in the excavation process, when water burst begins to occur when the unsealed investigation hole 4 is encountered, the earth excavation of the foundation pit 1 at the position is suspended, and the burying of the well point pipe is immediately organized.

b, step b: an A well point pipe 7 is arranged in the unsealed investigation hole 4 for draining open water, and four B well point pipes 5 are arranged in the soil body 2 around the unsealed investigation hole 4 for draining the soil body.

Referring to fig. 3, the B-well point pipe 5 is arranged at four corners of a square with an unsealed survey hole 4 as a center and a side length of 1.5 m; the A well point pipe 7 is arranged in the center of the unsealed investigation hole 4; the lengths of the well point pipe 7 and the well point pipe 5 are 5m, the pipe is phi 57 x 3.5 steel pipe, the top of the well point pipe is exposed to the excavation surface by 30cm, the well point pipe 5 is arranged from 70cm below the excavation surface to the bottom of the pipe to be a filter pipe section 6, and the well point pipe 7 is provided with the filter pipe section 6 within the range of 1m at the bottom; the filter tube section 6 is wrapped by an 80-mesh copper wire mesh.

c, step c: the B-well point pipe 5 and the a-well point pipe 7 are connected to a drain manifold 10 provided with a vacuum pump 9 by drain branch pipes 11.

d, step d: and starting a vacuum pump 9 to pre-dewatering the soil body 2 within the range of 2m x 2m around the unsealed investigation hole 4.

And e, step e: when the water level is reduced to 1m below the excavation surface, adopting a small-sized excavating machine, taking an unsealed investigation hole 4 as a center, excavating a reverse-filtering water collecting pit 8 with the depth of 50cm according to a soil body 2 with a square range with the side length of 2.0m, and rapidly backfilling bagged graded broken stone in the reverse-filtering water collecting pit to the excavation surface.

f, step f: and continuing to carry out precipitation on the soil body 2 with the range of 2m x 2m around the unsealed investigation hole 4 until the water level falls to 3m below the original excavation surface.

g, the step: restoring the earth excavation of the foundation pit 1 until the existing water level of the unsealed investigation hole 4 is 1m above.

And h, step h: and d, removing the B well point pipe 5 and the A well point pipe 7, re-burying the B well point pipe 5 and the A well point pipe 7 in the unsealed investigation hole 4 according to the step a, and repeating the steps B-g until the water level in the soil body 2 in the range of 2 x 2m around the unsealed investigation hole 4 falls below the foundation pit 1 for 2m.

i, step: and a small-sized excavating machine is adopted, an unsealed investigation hole 4 is taken as the center, a concrete plugging pit is excavated according to a square with the side length of 2.0m, the depth of the concrete plugging pit is calculated by the water pressure balance of the pressure-bearing water, a B well point pipe 5 and an A well point pipe 7 are quickly pulled out, the water head condition of the aquifer 3 of the foundation pit 1 is combined, and quick setting micro-expansion concrete is filled in time for plugging.

The above embodiments are further illustrative of the present utility model and are not intended to limit the present utility model, but all equivalent embodiments are intended to be included within the scope of the appended claims.

Claims

1. The utility model provides a well point pipe precipitation system of unblocked investigation hole foundation ditch gushing water treatment which characterized in that, this well point pipe precipitation system includes: an A well point pipe (7) arranged in the unsealed investigation hole and a B well point pipe (5) arranged in soil surrounding the unsealed investigation hole, wherein the B well point pipe (5) and the A well point pipe (7) are connected to a drainage main pipe (10) provided with a vacuum pump (9) through a drainage branch pipe (11) to realize local drainage and drainage of water burst of the unsealed investigation Kong Jikeng; four B well point pipes (5) are arranged at four corners of a square with an unsealed investigation hole as the center and the side length of 1.5 m; the A well point pipe (7) is arranged in the center of the unsealed investigation hole.

2. The well point pipe dewatering system for the water treatment of the foundation pit with the open investigation holes according to claim 1, wherein the lower parts of the B well point pipe (5) and the A well point pipe (7) are provided with filter pipe sections (6) wrapped by 80-mesh copper wire meshes.