CN211547782U

CN211547782U - Pipe well sealing device for high-pressure water head of sand layer deep foundation pit

Info

Publication number: CN211547782U
Application number: CN201921852945.0U
Authority: CN
Inventors: 马艳超; 高永丰; 申建峰; 牛武林; 杨鹏
Original assignee: China Shanxi Sijian Group Co Ltd
Current assignee: China Shanxi Sijian Group Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-09-22
Anticipated expiration: 2029-10-31

Abstract

The utility model relates to a ground construction field specifically is a pipe well shut-in device of sand bed deep basal pit high pressure flood peak. The technical problem of well plugging of a dewatering well provides a pipe well plugging device for a high-pressure water head of a sand layer deep foundation pit. Including the precipitation well, establish bottom plate concrete layer in the precipitation well upper portion outside, be equipped with the steel sleeve in the bottom plate concrete layer of precipitation well, be equipped with stagnant water steel sheet ring outside the rigid sleeve, the lower part of precipitation well is equipped with the steel-pipe well, steel sleeve and steel-pipe well connect, the gravel filter bed is established to steel-pipe well outside bottom plate concrete layer below, at the inside steel reinforcement cage that is equipped with of precipitation well, the hanger plate, the well shut-in apron is equipped with the closed tube on the hole on the well shut-in apron, and the drinking-water pipe is connected to the lower extreme, the drinking-water pipe lower extreme pass the hole on the hanger plate, pack the micro-expansion concrete in the. Compared with the prior art, the utility model discloses can prevent that the bearing water from following the wellhole blowout, can guarantee in the well concreting intensity, closely knit degree, impermeability.

Description

Pipe well sealing device for high-pressure water head of sand layer deep foundation pit

Technical Field

The utility model relates to a ground construction field specifically is a pipe well shut-in device of sand bed deep basal pit high pressure flood peak.

Background

For the geological condition of a sand layer with strong permeability of a deep foundation pit, the permeability is strong, the water yield of a dewatering well for sealing the well at the latest is large, and the bottom surface of the foundation has high water pressure. In the prior art, a plurality of well sealing schemes are provided, for example, a foundation pit bottom dewatering well sealing method disclosed in application No. 201510200692.9, wherein a water filtering tank is provided for a high water yield well, wherein continuous water pumping is required in the filling process, a hard plastic pipe is inserted into the water filtering tank, and the water filtering tank is externally connected with a water inlet of a water pump; the materials are prepared by mixing a certain amount of sand, cement and gravel dry materials according to the weight ratio of 2: 2: 1, adding water glass or other accelerating agents, and uniformly stirring the mixture beside a well head; pumping water with large capacity, when the water level drops to the top end of the water filtering tank, putting the mixture, tamping while throwing, when filling the valve, quickly cutting off the water pumping pipe at the upper end of the valve, closing the valve, pouring C15 concrete, sealing the well mouth, and finally fully welding a sealing steel plate. In this scheme, because the strainer case lower part still has a large amount of water, concrete compactness still can receive certain influence.

Disclosure of Invention

The utility model provides a solve the technical problem of precipitation well shut-in, provide a pipe well shut-in device of sand bed deep basal pit high pressure flood peak.

Realize the technical scheme of the utility model, a tube well shut-in device of sand bed deep basal pit high pressure flood peak includes the precipitation well, establishes bottom plate concrete layer in the precipitation well upper portion outside, is equipped with the steel sleeve in the bottom plate concrete layer of precipitation well, and steel sleeve is equipped with stagnant water steel sheet ring outward, and the lower part of precipitation well is equipped with the steel-pipe well, steel sleeve and steel-pipe well connect, establish the gravel filter bed below the steel-pipe well outside bottom plate concrete layer, at the inside steel reinforcement cage that is equipped with of precipitation well, steel reinforcement cage below is equipped with the hanger plate, the steel reinforcement cage is equipped with the shut-in apron, is equipped with the hole on shut-in apron and on the hanger plate, is equipped with the closed pipe on the hole on the shut-in apron, and the drinking-water pipe is connected to the lower extreme, the drinking-water pipe lower extreme pass.

Compared with the prior art, the utility model discloses a well shut-in sleeve and well shut-in apron's design leaves the mode of self priming pump step-down outward, prevents that bearing water from following the wellhole blowout, can guarantee in the well concreting intensity, closely knit degree, impermeability. In order to ensure that the concrete pouring of the foundation bottom plate is not interfered, a longer water outlet pipeline needs to be led out from the well and connected with a self-sucking pump. This patent is connected through the two screw thread of supporting pipe cap and the outlet pipe of staying on the well-plugging steel sheet, reaches the well-plugging purpose through simple reliable operation, avoids drawing longer outer outlet pipe of drawing forth, and pouring to basic concrete is disturbed for a short time.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic view of a well-sealing cover plate.

Fig. 3 is a cross-sectional view of fig. 2.

In the figure: 1-precipitation well, 2-steel reinforcement cage, 3-micro-expansion concrete, 4-gravel filter layer, 5-steel pipe well, 6-concrete cushion layer, 7-waterproof layer, 8-steel reinforcement, 9-bottom plate concrete layer, 10-steel sleeve, 11-closed pipe, 12-well sealing cover plate, 13-water stop steel plate ring, 14-water pumping pipe and 15-hanging plate.

Detailed Description

As shown in fig. 1, the pipe well sealing device for the high-pressure water head of the sand layer deep foundation pit comprises a dewatering well 1, a bottom plate concrete layer 9 is arranged on the outer side of the upper portion of the dewatering well 1, a steel sleeve 10 is arranged in the bottom plate concrete layer 9 of the dewatering well 1, a water stop steel plate ring 13 is arranged outside the steel sleeve 10, a steel pipe well 5 is arranged on the lower portion of the dewatering well 1, the steel sleeve 10 is connected with the steel pipe well 5, a gravel filter layer 4 is arranged below the bottom plate concrete layer on the outer side of the steel pipe well 5, a steel reinforcement cage 2 is arranged inside the dewatering well 1, a hanging plate 15 is arranged below the steel reinforcement cage 2, a well sealing cover plate 12 is arranged above the steel reinforcement cage 2, holes are formed in the well sealing cover plate 12 and the hanging plate 15, a sealing pipe 11 is arranged in the hole in the well sealing cover plate 12, the lower end of the water pumping pipe 14 penetrates through the hole in the hanging plate 15.

Wherein the part of the pumping pipe 14 below the hanging plate 15 is provided with a filter screen, and the wall of the section of pipe is provided with a permeable hole.

A sealing nut is arranged at the upper end of the sealing pipe 11.

Set up concrete cushion 6 below bottom plate concrete layer 9, be equipped with waterproof layer 7 between concrete cushion 6 and bottom plate concrete layer 9, be equipped with reinforcing bar 8 in bottom plate concrete layer 9. Through the design, the strength near the precipitation wellhead can be strengthened, and water seepage or flooding is prevented.

The method comprises the following specific operation and use steps on site:

the first step is as follows: the submersible pump is taken out of the tube well, the PVC water pumping tube is connected with the self-sucking pump outside the well, the steel hanging plate and the steel reinforcement cage are placed, the lower end of the water pumping tube is 1m lower than the rigid hanging plate, quincunx holes are formed in the range according to the distance of 50mm, the hole diameter is 10mm, and the water pumping tube is wrapped by 1 layer of 80-mesh filter screen.

The second step is that: the self-priming pump is started to enable the self-priming pump to descend to the position 2m below the bottom elevation of the raft plate through the water pumping pipe, and micro-expansion concrete which is 2m below a well mouth in height and is higher than the bottom plate by one mark is rapidly filled.

The third step: prefabricating a well sealing cover plate, perforating and welding 2 6 steel pipes serving as closed pipes on the well sealing cover plate, wherein the upper end of the cover plate is 50mm, the lower end of the cover plate is 100mm, and the wall thickness is 4 mm. The lower end of the closed pipe is connected with a PVC plastic pipe in the well, and the upper end of the closed pipe is connected with a self-priming pump water pipe. And when the welding condition is met, welding the cover plate at the position 100mm below the top elevation of the structural foundation bottom plate.

The fourth step: the self-priming pump stops pumping water, and the screw thread of the sealed pipe on the well-sealing cover plate is wrapped with waterproof adhesive tape and screwed down by a matched pipe cap.

The fifth step: and (4) filling a groove with the height of 200mm by adopting concrete with the same strength as the foundation slab at the elevation of the well sealing cover plate. And completing well sealing.

Claims

1. The utility model provides a pipe well shut-in well device of sand bed deep basal pit high pressure flood peak, includes precipitation well (1), characterized by: a bottom plate concrete layer (9) is arranged on the outer side of the upper part of the dewatering well (1), a steel sleeve (10) is arranged in the bottom plate concrete layer (9) of the dewatering well (1), a water stop steel plate ring (13) is arranged outside the steel sleeve (10), a steel pipe well (5) is arranged on the lower part of the dewatering well (1), the steel sleeve (10) is connected with the steel pipe well (5), a gravel filter layer (4) is arranged below a concrete layer of a bottom plate on the outer side of the steel pipe well (5), a reinforcement cage (2) is arranged in the precipitation well (1), a hanger plate (15) is arranged below the reinforcement cage (2), a well sealing cover plate (12) is arranged above the reinforcement cage (2), holes are arranged on the well sealing cover plate (12) and the hanger plate (15), a closed pipe (11) is arranged on the hole on the well sealing cover plate (12), and the lower end is connected with a water pumping pipe (14), the lower end of the water pumping pipe (14) penetrates through a hole in the hanging plate (15), and the reinforcement cage (2) is filled with micro-expansion concrete (3).

2. The pipe well sealing device for the high-pressure water head of the sand layer deep foundation pit as claimed in claim 1, wherein: the part of the pumping pipe (14) below the hanging plate (15) is provided with a filter screen, and the wall of the section of pipe is provided with water permeable holes.

3. The pipe well sealing device for the high-pressure water head of the sand layer deep foundation pit as claimed in claim 1, wherein: a sealing nut is arranged at the upper end of the sealing pipe (11).

4. The pipe well sealing device for the high-pressure water head of the sand layer deep foundation pit as claimed in claim 1, wherein: the concrete cushion (6) is arranged below the bottom plate concrete layer (9), the waterproof layer (7) is arranged between the concrete cushion (6) and the bottom plate concrete layer (9), and the steel bars (8) are arranged in the bottom plate concrete layer (9).