Structure for reducing sand content of foundation pit dewatering
By using a combination structure of well casing, double-layer filter screen and connecting ring in the dewatering well of the foundation pit, the problems of easy breakage and bottom misalignment of sand-free cement pipes during the lowering process were solved, achieving the effect of reducing sand content and improving the bearing capacity of the foundation.
Patent Information
- Application Number
- CN202423081223.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-12
AI Technical Summary
The existing sand-free cement pipes in the foundation pit dewatering wells are prone to breakage during the lowering process, and the bottom sealing device is prone to misalignment, which makes it impossible to fix the filter cloth, making it impossible to control the sand content of the pumped water, and easily forming cavities, resulting in insufficient bearing capacity of the foundation.
The well casing is constructed using a combination of a bottom casing, a double-layer filter, a connecting ring, and a sealing elastomer to form an overall seal. This ensures the sealing and stability of the bottom of the well casing, preventing the entry of mud and sand. The multi-section structure and connecting rings achieve a tight connection of the well casing, preventing misalignment of the bottom sealing device.
It effectively reduced the sand content in the foundation pit dewatering, prevented the well pipe components from losing their sealing performance, avoided the formation of cavities, improved the bearing capacity of the foundation, and ensured the stability and efficiency of the dewatering well.
Smart Images
Figure CN223813770U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a well pit bottom sealing technology field especially relates to a structure of reducing sand content of foundation pit dewatering. BACKGROUND
[0002] In the prior art, the dewatering well is generally formed by the slurry wall drilling method, a sand-free cement pipe with water permeability is installed in the hole, and a well wall is formed by a well head pipe, the dewatering well in the structure is generally vertically designed and has an equal diameter, and a submersible pump is arranged at the bottom of the dewatering well, and the water collected at the bottom of the dewatering well is discharged by the submersible pump to achieve the purpose of dewatering.
[0003] In the prior art, the dewatering well is designed to have an equal diameter, and a sand-free cement pipe with a diameter of 50 cm is generally selected, the cement pipe with the structure has a large self-weight, the installation is time-consuming and laborious, the operation precision of the wrapping filter cloth process cannot be guaranteed, the sand-free cement pipe is prone to breakage during the lowering process of the well pipe, and the bottom sealing device is only a circular template, when the circular template is lowered to the bottom of the hole, the steel wire rope used for lowering is easily pulled out to cause the bottom sealing to be deviated, so that the filter cloth at the lowermost layer cannot be fixed to the wall of the sand-free pipe, and the submersible pump directly pumps water without filtration, and the sand content in the pumped water cannot be controlled. SUMMARY
[0004] The utility model discloses a structure of reducing sand content of foundation pit dewatering, solves the technical problem that the sand-free dewatering structure in the prior art is prone to filter cloth displacement and causes insufficient foundation bearing capacity due to the formation of a cavity by pumping.
[0005] The utility model discloses a structure of reducing sand content of foundation pit dewatering, solves the technical problem that the sand-free dewatering structure in the prior art is prone to filter cloth displacement and causes insufficient foundation bearing capacity due to the formation of a cavity by pumping.
[0006] A structure of reducing sand content of foundation pit dewatering, including: well pipe component, the bottom of well pipe component has bottom casing, the bottom and the circumferential of well pipe component are covered with double-layer filter screen, the bottom of bottom casing has a plurality of hoisting structures, the hoisting structure is used for the hoisting of well pipe component installation, the outside of double-layer filter screen has filter material layer, the outside of filter material layer is peripheral soil layer, the well pipe component is hollow structure, the hollow structure is used for accommodating drainage component, the top of well pipe component is provided with well pipe cover plate.
[0007] The utility model discloses a structure of reducing sand content of foundation pit dewatering, the main part of well pipe component is multi -section structure, the joint of multi -section structure is connected through the connecting snap ring.
[0008] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the vertical portion of connecting snap ring has connecting snap ring sealing elastomer between the well pipe part circumference.
[0009] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the hoist structure is installed through the prefabricated hole installation at bottom casing bottom.
[0010] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the hoist structure is the elbow connecting piece, the bottom of elbow connecting piece is locked through the bottom surface of the bottom of bottom casing with elbow lower part fixed nut, and the surface of bottom casing bottom is pressed tightly through the first metal gasket of the upper portion of elbow connecting piece.
[0011] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the surface between the first metal gasket and bottom casing bottom has the second elastomer gasket, and the bottom surface between the lower fixed nut and bottom casing bottom has the second metal gasket and the first elastomer gasket in proper order.
[0012] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the bottom of well pipe part and bottom casing bottom surface are provided with bottom casing bottom sealing elastomer.
[0013] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the bottom of well pipe part and bottom casing bottom surface are provided with bottom casing bottom sealing elastomer.
[0014] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the bottom of well pipe part and bottom casing bottom surface are provided with bottom casing bottom sealing elastomer.
[0015] The utility model discloses a structure of reducing the sand content of foundation pit dewatering, the bottom of well pipe part and bottom casing bottom surface are provided with bottom casing bottom sealing elastomer. BRIEF DESCRIPTION OF DRAWINGS
[0016] The utility model will be further described below in combination with the drawings and embodiments, wherein:
[0017] Figure 1 is a schematic view of an embodiment of the utility model;
[0018] Figure 2 is a top view of the section EE;
[0019] Figure 3 is Figure 1 is a local enlarged view of the middle B;
[0020] Figure 4 is Figure 1 is a local enlarged view of the middle A. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0022] As Figures 1-4 shown, a structure for reducing the sand content of foundation pit dewatering, comprising: well pipe component 1, the bottom of the well pipe component 1 has bottom casing 7, the bottom and the circumferential direction of well pipe component 1 are covered with double-layer filter screen 5, the bottom of the bottom casing 7 has several hoisting structures 12, the hoisting structure 12 is used for the hoisting of well pipe component 1 installation, the double-layer filter screen 5 has filter material layer 3 outside, the periphery of the filter material layer 3 is soil layer 4, the well pipe component 1 is hollow structure, the hollow structure is used for accommodating drainage component 2, the top of the well pipe component 1 is provided with well pipe cover plate 18.
[0023] As a preferred embodiment, the main part of the well pipe component 1 is a multi-section structure, and the combination of the multi-section structure is connected by a connecting snap ring 10.
[0024] As a preferred embodiment, the well pipe component 1 has a connecting snap ring sealing elastomer 11 between the circumferential direction and the vertical part of the connecting snap ring 10.
[0025] As a preferred embodiment, the hoisting structure 12 is installed by prefabricating a hole in the bottom of the bottom casing 7.
[0026] As a preferred embodiment, the lifting structure 12 is an elbow connector, the bottom of which is locked with the bottom surface of the bottom of the bottom casing 7 through the elbow lower fixing nut 17, and the upper part of which is pressed against the surface of the bottom of the bottom casing 7 through the first metal gasket 15.
[0027] As a preferred embodiment, the first metal gasket 15 and the surface of the bottom of the bottom casing 7 have the second elastic body gasket 14 therebetween, and the lower fixing nut 17 and the bottom surface of the bottom of the bottom casing 7 have the second metal gasket 16 and the first elastic body gasket 13 therebetween in sequence.
[0028] As a preferred embodiment, the bottom of the well pipe component 1 and the bottom surface of the bottom casing 7 are provided with the casing bottom sealing elastic body 8.
[0029] As a preferred embodiment, the top circumferential inner side of the bottom casing 7 and the outside of the well pipe component 1 are provided with the sleeve sealing elastic body 6.
[0030] As a preferred embodiment, the filter layer 3 has the cohesive soil 9 at the top thereof.
[0031] Process steps are briefly described as follows:
[0032] Step one: prefabricate a bottom casing 7 prefabricated part with a bottom sealing, the bottom of which has four openings to ensure that the elbow connector can be inserted into the reserved hole; then prefabricate a plurality of connection clasp rings 10 for connecting two adjacent well pipe components 1; then prefabricate the connection clasp ring sealing elastic body 11 and the sleeve bottom sealing elastic body 8, prepare a plurality of elbow connectors and elbow lower fixing nuts, first elastic body gaskets 13, second elastic body gaskets 14 and first metal gaskets 15, and second metal gaskets 16. After the mechanical hole forming by the slurry wall protection drilling, the hole cleaning and slurry replacement operation needs to be performed to ensure that no thick mud skin is formed in the dewatering well hole at the aquifer part; the specific operation is to start adding clean water to the slurry when the drilling reaches the aquifer top plate position. After drilling to the design elevation, the drill bit is lifted to 0.50 m away from the bottom of the hole before the drilling is lifted, the hole is punched, the hole is cleaned, the slurry density in the hole is gradually adjusted to close to 1.05, the hole bottom silt is less than 30 cm, and the returned slurry does not contain mud blocks.
[0033] Step two: the bottom casing 7 is placed on the ground, the bottom casing sealing elastomer 8 is put into the bottom of the bottom casing 7 to reduce vibration and leakage, the well pipe component 1 is slowly put into the bottom casing 7 wrapped with double-layer filter screen 5 from the outside, and the well pipe component 1 is ensured to be seated on the bottom casing sealing elastomer 8, at this time the bottom sealing structure of the well pipe component is formed by the combination of the well pipe component 1 and the bottom casing sealing elastomer 8 relying on the weight of the well pipe component 1 itself. The double-layer filter screen 5 wrapped outside the well pipe component 1 is flattened from the bottom of the well pipe component 1, and the first metal gasket 15 and the first elastomer gasket 13 are combined to pass through the reserved hole at the bottom of the double-layer filter screen 5 through the elbow connector, and then the second elastomer gasket 14 and the second metal gasket 16 are fixed to the bottom of the bottom casing 7, and the lower part of the elbow is screwed with the elbow lower fixing nut 17, and the remaining three elbow connectors are also connected. The joint between the bottom casing 7 and the double-layer filter screen 5 outside the well pipe component 1 is filled with the sleeve sealing elastomer 6 sleeved from above the well pipe component 1, so that the well pipe component 1, the double-layer filter screen 5, the sleeve bottom sealing elastomer 6, the bottom casing 7 and the elbow connector form an internally sealed whole.
[0034] Step three: the combined well pipe component 1 is placed above the hole to be lowered, the steel wire rope for lowering is inserted into the elbow connector at the bottom of the well pipe component 1, and the well pipe component 1 is ensured to be vertically centered in the hole, and the lowering is started, at this time the closed space formed at the bottom of the well pipe prevents the well pipe component from floating up, and clear water is injected into the well to ensure the accuracy of the lowering, when the well pipe component 1 is lowered to a position 200mm away from the surrounding soil layer, the double-layer filter screen 5 is inserted into the well pipe component 1, the connecting ring 10 is sleeved, the double-layer filter screen 5 is taken out from the well pipe component 1 and wrapped on the connecting ring 10, the connecting ring 10 is ensured to be circumferentially without omission of the well pipe component 1, and then the connecting ring sealing elastomer 11 is inserted into the gap between the connecting ring 10 and the well pipe component 1, so that the connecting ring 10, the connecting ring sealing elastomer 11 and the filter cloth outside the well pipe component form an integral whole, at this time there is only filter screen between the well pipe component 1 outside the connecting ring 10 and the bottom casing 7, which ensures that groundwater can only enter the well through the filter screen. The filter screen in the connecting ring 10 is taken out and evenly distributed outside the connecting ring 10, the next well pipe component 1 is aligned with the fixing groove at the bottom of the connecting ring 10, the double-layer filter screen 5 is wrapped outside the well pipe component 1, and the well pipe component 1 is continued to be lowered. According to the depth of the well, a sufficient number of well pipe components 1 are lowered, and the uppermost well pipe component 1 is fixed with the filter screen by the connecting ring 10 and the connecting ring sealing elastomer 11, and the upper part is closed by the well pipe cover plate 18.
[0035] Step four: after the well pipe component 1 is lowered, the filter layer 3 is slowly filled into the gap between the well pipe component 1 and the surrounding soil layer 4, and when the distance from the top of the surrounding soil layer 4 is 1000mm, the viscous soil 9 is backfilled, which can protect the well pipe component 1 and the filter screen. The upper well pipe cover plate 18 is removed, and the water pumping equipment is put into the test pumping, and because the bottom of the well pipe component 1 is provided with the bottom casing 7, the water pumping equipment is deeply inserted into the position, so that the excessive pumping of the surrounding soil outside the bottom well pipe component 1 is effectively avoided.
[0036] Step five: after the well is completed and stabilized, the water pumping equipment is replaced by the pneumatic dewatering equipment, the equipment does not provide active water pumping, and the water pumping is started after the water level reaches the position of the air pump, so that the lower cavity and excessive pumping sand caused by excessive pumping are effectively avoided. Subsequently, the water pipe air pipe is stretched out from the top of the well pipe cover plate, and protection measures are taken.
[0037] In the description of the present application, it should be pointed out that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0038] In the description of the present application, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.
[0039] It should be understood that for ordinary skilled persons in the art, the above description can be improved or changed, and all these improvements and changes should belong to the protection scope of the appended claims of the present application.
Claims
1. A structure for reducing the sand content in foundation pit dewatering, characterized in that, include: Well pipe component (1), the well pipe component (1) has a bottom casing (7) at the bottom, the bottom and circumference of the well pipe component (1) are covered with a double layer of filter screen (5), the bottom casing (7) has several lifting structures (12) at the bottom, the lifting structures (12) are used for lifting the well pipe component (1) during installation, the double layer of filter screen (5) has a filter material layer (3) outside, the filter material layer (3) is surrounded by a soil layer (4) outside, the well pipe component (1) has a hollow structure, the hollow structure is used to accommodate the drainage component (2), and the top of the well pipe component (1) is provided with a well pipe cover plate (18).
2. The structure for reducing sand content in foundation pit dewatering according to claim 1, characterized in that: The main body of the well casing component (1) is a multi-section structure, and the joints of the multi-section structure are connected by a connecting snap ring (10).
3. The structure for reducing sand content in foundation pit dewatering according to claim 2, characterized in that: The well casing component (1) has a connecting ring sealing elastomer (11) between its circumferential direction and the vertical part of the connecting ring (10).
4. The structure for reducing sand content in foundation pit dewatering according to claim 1, characterized in that: The hoisting structure (12) is installed by pre-drilling holes at the bottom of the bottom casing (7).
5. The structure for reducing sand content in foundation pit dewatering according to claim 4, characterized in that: The lifting structure (12) is an elbow connector. The bottom of the elbow connector is locked to the bottom surface of the bottom of the bottom sleeve (7) by the lower elbow fixing nut (17). The upper part of the elbow connector is pressed against the bottom surface of the bottom of the bottom sleeve (7) by the first metal gasket (15).
6. The structure for reducing sand content in foundation pit dewatering according to claim 5, characterized in that: A second elastomeric gasket (14) is provided between the first metal gasket (15) and the bottom surface of the bottom sleeve (7), and a second metal gasket (16) and a first elastomeric gasket (13) are provided between the lower fixing nut (17) and the bottom surface of the bottom sleeve (7).
7. The structure for reducing sand content in foundation pit dewatering according to claim 6, characterized in that: A bottom sealing elastomer (8) is provided between the bottom of the well casing component (1) and the bottom surface of the bottom casing (7).
8. The structure for reducing sand content in foundation pit dewatering according to claim 7, characterized in that: A sleeve sealing elastomer (6) is provided between the inner side of the top circumference of the bottom casing (7) and the outer side of the well pipe component (1).
9. The structure for reducing sand content in foundation pit dewatering according to claim 1, characterized in that: The top of the filter media layer (3) has cohesive soil (9).