Water-collecting well construction device under special geological environment of rich water, confined water or quicksand

Abstract

The utility model relates to a water-collecting well construction device under special geological environment of rich water, confined water or quicksand, which comprises a steel caisson used for being placed on a foundation to isolate river water, confined water or quicksand; the reinforcement cage is fixedly arranged between the steel caisson and the wooden box; the wooden box is detachably arranged in the steel caisson; the water pumping pipe is fixed to the outer side of the steel caisson and used for being connected with a vacuum pump to pump out water in the foundation. The utility model relates to a water-collecting well construction device in special geological environments rich in water, confined water or quicksand, which can well solve the construction problem of water-collecting wells in special geological environments rich in water, confined water, quicksand and the like, is particularly suitable for water-collecting well construction in special geological environments with medium scale, water insulation and difficult precipitation, and belongs to the technical field of building construction.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a water collection well construction device under special geological conditions such as rich water, pressurized water or quicksand. Background Art

[0002] During the construction of underground structures such as urban pipeline corridors and subways, when constructing water collection wells in special geological environments with pressurized water, quicksand, groundwater, or near rivers and streams, it is difficult to completely prevent water seepage from the foundation pit using existing water-stop curtains and other water-blocking and water-reduction technologies due to the bottom soil composition of silt, silty fine sand, sand layers, clay, high water levels, and even pressurized water. Construction of water collection wells requires secondary excavation of parts of the foundation pit. The slightest carelessness can lead to the continuous erosion and damage of the foundation pit bottom by pressurized water and quicksand, resulting in water and sand gushing. This compromises the quality of the reinforced concrete pouring around the water collection wells, leading to leakage and water gushing from the sidewalls and floor of the water collection wells. This requires complex and time-consuming measures to stop the leaks. Utility Model Content

[0003] In response to the technical problems existing in the existing technology, the purpose of this utility model is to provide a water collection well construction device in special geological environments with rich water, pressurized water or quicksand, so as to solve the problem that the existing technology cannot guarantee a water-free construction working surface for the water collection well in special geological environments with pressurized water, quicksand, groundwater, etc., and complex measures need to be taken to block leakage after pouring the water collection well concrete, which is labor-intensive and time-consuming.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A water collection well construction device for special geological environments with rich water, pressurized water or quicksand, comprising: a steel caisson, which is used to be placed on the foundation to isolate river water, pressurized water or quicksand; a steel cage, which is fixedly arranged between the steel caisson and a wooden box; a wooden box, which is detachably arranged in the steel caisson; and a water pump, which is fixed to the outside of the steel caisson and is used to connect to a vacuum pump to pump out water in the foundation.

[0006] As a preferred embodiment, the steel caisson includes surrounding steel plates and a bottom steel plate, and the bottom of the bottom steel plate is sealed to the bottom of the surrounding steel plates to form a cubic structure with a hollow interior and an open top.

[0007] As a preferred embodiment, a steel keel is provided at the bottom of the bottom cover steel plate, the steel keel is fixedly connected to the bottom of the surrounding steel plates, a bottom keel is provided at the bottom of the surrounding steel plates, and a sealing gasket is provided between the steel keel and the bottom keel.

[0008] As a preferred embodiment, a waterproof layer is provided at the connection between the surrounding steel plates and the bottom steel plate.

[0009] As a preferred embodiment, the surrounding steel plates and the bottom steel plate are provided with steel bosses, the steel bosses are provided with threaded holes, and the wooden box is connected to the surrounding steel plates and the bottom steel plate respectively by bolts matching the threaded holes.

[0010] As a preferred embodiment, the end of the water pumping pipe located at the bottom of the steel caisson is connected to a filter flower tube.

[0011] As a preferred embodiment, a reverse filter layer is provided on the outside of the filter flower tube.

[0012] In general, the utility model has the following advantages:

[0013] 1. The construction device of the utility model adopts assembled steel caisson to build a reliable waterless construction environment, effectively isolating pressurized water, quicksand, and river water, and improving the efficiency and quality of water collection well construction.

[0014] 2. The pipeline system of the construction device of the present invention is used for drainage and pressure relief before pouring concrete in the water collection well to prevent the steel caisson from floating up; after pouring concrete in the water collection well, it is used for grouting to reinforce the foundation, effectively ensuring the bearing capacity and anti-penetration performance of the foundation, with one pipe for multiple uses.

[0015] 3. The construction device of the utility model effectively solves the problem of floating of the wooden box serving as the inner formwork during concrete pouring by rigidly connecting the threads of the water-stop screw with the steel caisson, and improves the efficiency of formwork installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a water collection well construction device for use in special geological environments with rich water, pressurized water or quicksand;

[0017] Figure 2 A three-dimensional diagram of a water collection well construction device in a special geological environment with rich water, pressurized water or quicksand;

[0018] Figure 3 This is a perspective view of a steel caisson;

[0019] Figure 4 This is a three-dimensional image of the back cover steel plate;

[0020] Figure 5 The present invention is a construction flow chart of a water collection well construction device in a special geological environment of rich water, pressurized water or quicksand.

[0021] In the figure: 1. Foundation; 2. Steel bar protective layer; 3. Pumping pipe; 4. Sealing gasket; 5. Steel caisson; 6. Steel cage; 7. Bottom keel; 8. Steel keel; 9. Bottom sealing steel plate; 10. Pad; 11. Filter flower tube; 12. Check valve; 13. Steel boss; 14. Threaded hole; 15. Wooden box; 16. Steel bar of the tunnel floor. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to specific implementation methods.

[0023] like Figure 1-5 As shown, this embodiment provides a water collection well construction device for special geological environments with rich water, pressurized water, or quicksand, including: a steel caisson 5, which is placed on a foundation 1 to isolate accumulated water, pressurized water, or quicksand; a steel cage 6, which is fixedly disposed between the steel caisson 5 and a wooden box 15; a wooden box 15, which is detachably disposed within the steel caisson 5; and a pumping pipe 3, which is fixed to the outside of the steel caisson 5 and is used to connect to a vacuum pump to extract water from the foundation 1. Specifically, the pumping pipe 3 is welded to the outside of the steel caisson 5 on all four sides and is formed by cutting steel pipes. When the steel caisson 5 is placed at the elevation of the bottom of the foundation pit, prefabricated pads 10 are used to pad the side walls and four corners of the bottom of the steel caisson 5. When the steel caisson 5 is placed at the bottom of the foundation pit, it is necessary to excavate the inside and outside of the steel caisson 5, and use a silt pump to extract the silt at the bottom of the foundation pit.

[0024] The steel caisson 5 includes surrounding steel plates and a bottom steel plate 9. The size of the bottom steel plate 9 is consistent with the size of the inner side of the surrounding steel plates. The bottom steel plate 9 is sealed to the bottom of the surrounding steel plates to form a cubic structure with a hollow interior and an open top.

[0025] A profiled steel keel 8 is installed at the bottom of the bottom steel plate 9. The profiled steel keel 8 is tightly welded to the bottom of the surrounding steel plates. The bottom of the surrounding steel plates is provided with a bottom keel 7. A sealing gasket 4 is installed between the profiled steel keel 8 and the bottom keel 7. The profiled steel keel 8 and the bottom keel 7 are connected by bolts. The sealing gasket 4 prevents water from entering the caisson through the connection bolt holes. It is made of a flexible sealing material, such as a rubber gasket.

[0026] A waterproof layer is provided at the connection between the surrounding steel plates and the bottom steel plate 9, and the waterproof layer is prepared by existing waterproof materials.

[0027] The surrounding steel plates and the bottom steel plate 9 are provided with a steel boss 13, and the steel boss 13 is provided with a threaded hole 14. The wooden box 15 is connected to the surrounding steel plates and the bottom steel plate 9 respectively by bolts matching the threaded holes 14. Specifically, the threaded hole 14 is a water-stop screw thread.

[0028] The end of the water pumping pipe 3 at the bottom of the steel caisson 5 is connected to a filter tube 11, and a filter layer is provided on the outside of the filter tube 11. The filter layer can be coarse sand, gravel, etc. to avoid hollowing out the bottom sediment.

[0029] A steel bar protective layer 2 is provided on the top of the steel caisson 5 , and the steel bar protective layer 2 extends to all sides of the top of the steel caisson 5 .

[0030] This embodiment provides a specific application method of a water collection well construction device in a special geological environment of rich water, confined water or quicksand, including the following steps:

[0031] S1. Excavate the foundation pit according to the design requirements, excavate the water collection well to the predetermined elevation with local slope, and then place the prefabricated steel caisson 5. The pumping pipes 3 are symmetrically welded around the outer sides of the caisson wall.

[0032] S2. Because the bottom of the foundation pit is rich in water and contains quicksand, a sediment pump is first placed from the steel caisson 5 to the bottom of the pit to pump out water, and an excavator is used to dig inside and outside the steel caisson 5. The lifting equipment cooperates with the surveying personnel to synchronously adjust the steel caisson 5 to the bottom elevation and position.

[0033] S3. After adjusting the steel caisson 5's posture, use an excavator to place prefabricated pads 10 on the sidewalls and four corners of the steel caisson 5. Connect the filter tubes 11 and valve to the pumping pipe 3. Connect the pumping pipe 3 to the vacuum pump. Simultaneously, remove the sediment pump. Backfill the over-excavated areas inside and outside the steel caisson 5 with gravel and medium-coarse sand and level them. Decompression and drainage by the vacuum pump effectively reduce the water pressure at the joint between the steel caisson 5 and the bottom steel plate 9, lowering the buoyancy after the bottom is sealed, thus preventing the steel caisson 5 from floating or shifting after the bottom is sealed. Wrap the filter tubes 11 with filter material (such as coarse sand, gravel, etc.) to prevent the bottom sediment from being drained.

[0034] S4. Install the caisson bottom steel plate 9. The lower steel keel 8 of the bottom steel plate 9 is welded securely to the surrounding caisson 5 wall panels. A gasket 4 is installed between the steel keel 8 and the caisson bottom keel 7, which are then bolted together. The bottom steel plate 9 matches the inner circumference of the steel caisson 5 in S1. After the bottom is sealed, the steel caisson 5 forms a box-like structure with closed sides and bottom and an open top. The gaps between the four edges are filled with waterproof material, creating a completely water-free construction environment for the assembled steel caisson 5.

[0035] S5. Steel bosses 13 are installed on the steel caisson 5 and the bottom steel plate 9. Threaded holes 14 are provided on the bosses. The inner and outer water collection well reinforcement cages 6 are simultaneously tied to the corridor floor reinforcement 16. The inner wooden formwork box 15 is installed, and concrete is poured. Bolts are used to connect the inner wooden formwork box 15 to the bottom steel plate 9 through the threaded holes 14 on the steel bosses 13. This prevents the inner wooden formwork box 15 from floating and ensures structural integrity.

[0036] S6. After completing the structural construction, remove the vacuum pump and install the check valve 12 on the water extraction pipe 3. Use the water extraction pipe 3 for reverse grouting. After stabilization, remove the valve and check valve 12, and seal the water extraction pipe 3 with a plug. Cement-water-glass slurry can be used for reverse grouting. After grouting, the soil around the water collection well is consolidated, providing reliable bearing capacity and anti-permeability performance for the foundation 1.

[0037] The above embodiments are preferred implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A water collection well construction device in a special geological environment with rich water, pressurized water or quicksand, characterized in that: include: Steel caissons, which are used to be placed on the foundation to isolate river water, pressurized water or quicksand; Steel cage, which is fixed between the steel caisson and the wooden box; Wooden box, which is detachably set in the steel caisson; The suction pipe is fixed on the outside of the steel caisson and is used to connect a vacuum pump to extract water from the foundation.

2. A water collection well construction device for use in special geological environments such as rich water, pressurized water, or quicksand according to claim 1, characterized in that: The steel caisson includes surrounding steel plates and a bottom steel plate. The bottom of the bottom steel plate is sealed and connected to the bottom of the surrounding steel plates to form a cubic structure with a hollow interior and an open top.

3. A water collection well construction device for use in special geological environments such as rich water, confined water, or quicksand according to claim 2, characterized in that: A steel keel is provided at the bottom of the bottom cover steel plate, which is fixedly connected to the bottom of the surrounding steel plates. A bottom keel is provided at the bottom of the surrounding steel plates, and a sealing gasket is provided between the steel keel and the bottom keel.

4. A water collection well construction device for use in special geological environments such as rich water, confined water, or quicksand according to claim 2, characterized in that: A waterproof layer is provided at the joints of the surrounding steel plates and the bottom steel plates.

5. The water collection well construction device for special geological environments such as rich water, pressurized water or quicksand according to claim 2, characterized in that: The surrounding steel plates and the bottom cover steel plate are provided with steel bosses, the steel bosses are provided with threaded holes, and the wooden box is respectively connected to the surrounding steel plates and the bottom cover steel plate through bolts matching the threaded holes.

6. The water collection well construction device for special geological environments such as rich water, pressurized water or quicksand according to claim 1, characterized in that: The end of the water pumping pipe located at the bottom of the steel caisson is connected with a filter flower pipe.

7. A water collection well construction device for use in special geological environments such as rich water, pressurized water, or quicksand according to claim 6, characterized in that: An anti-filtration layer is provided on the outside of the filter flower tube.

Images