Well sealing structure for relief well of foundation pit

Abstract

The utility model relates to a well sealing structure of a foundation pit pressure relief well, which comprises a dewatering well, a well sealing layer group and a construction assembly, the dewatering well is positioned in a foundation pit, and the well sealing layer group is arranged in the dewatering well. The well sealing layer set is composed of a gravel concrete mixing layer, a first micro-expansive concrete layer, prefabricated concrete columns, a second micro-expansive concrete layer, a steel plate with round holes and a third micro-expansive concrete layer. The gravel concrete mixing layer, the first micro-expansive concrete layer, the prefabricated concrete column, the second micro-expansive concrete layer, the steel plate with the round holes and the third micro-expansive concrete layer are sequentially filled from bottom to top, the construction assembly comprises a foundation pit bottom cushion layer and a triangular support, and the foundation pit bottom cushion layer is located on the outer side of the top of the dewatering well; the precast concrete column is adopted, the slurry solidification time is shortened, the safety in the well sealing process is also ensured, and multi-section sealing is adopted in the construction process, so that the anti-seepage performance of well sealing can be greatly enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to well sealing structure technical field especially a foundation pit pressure relief well well sealing structure. BACKGROUND

[0002] With the progress of the times, more and more foundation pit projects, sometimes need to consider the influence of confined water in the foundation pit excavation process, commonly used pressure relief well pumping, to ensure the safety and stability of foundation pit construction, after the completion of foundation pit subexcavation, need to remove a part of pressure relief well. At this time, due to the foundation pit bottom plate has not been poured, and still have part of the well pumping, groundwater is unstable, greatly increase the difficulty of sealing, the common deep foundation pit sealing method is: pouring concrete in the well and welding steel plate in the well port, if this method is in the case of groundwater instability, the impermeability is low, and there is a certain security risk in the later period.

[0003] Therefore, there is a need for a foundation pit pressure relief well sealing structure to help solve the above problems. SUMMARY

[0004] In view of the technical problems that the workbench is also in an inclined state when used in the position where the ground is uneven, so that the maintenance personnel are not easy to maintain balance, and there is a security risk when used, the utility model provides a foundation pit pressure relief well sealing structure.

[0005] The technical scheme adopted by the utility model is: a foundation pit pressure relief well sealing structure, comprising a well, a well sealing layer group and a construction assembly, the well is located in the foundation pit, the well sealing layer group is arranged in the well, the well sealing layer group is composed of a gravel concrete mixed layer, a first layer of micro-expansion concrete layer, a prefabricated concrete column, a second layer of micro-expansion concrete layer, a steel plate with a circular hole and a third layer of micro-expansion concrete layer, the gravel concrete mixed layer, the first layer of micro-expansion concrete layer, the prefabricated concrete column, the second layer of micro-expansion concrete layer, the steel plate with a circular hole and the third layer of micro-expansion concrete layer are sequentially filled from bottom to top.

[0006] Further, the construction assembly comprises a foundation pit bottom pad and a triangular support, and the foundation pit bottom pad is located outside the top of the well.

[0007] Further, the triangular support is located at the top of the well, and the triangular support is fixedly installed at the top of the foundation pit bottom pad.

[0008] Further, the triangular support is located at the top of the well, and the triangular support is fixedly installed at the top of the foundation pit bottom pad.

[0009] Further, the steel pipe is arranged in the prefabricated concrete column, and the steel pipe butt pipe is fixedly installed in the triangular support.

[0010] Further, the steel pipe is arranged in the prefabricated concrete column, and the steel pipe butt pipe is fixedly installed in the triangular support.

[0011] Further, the steel pipe is arranged in the prefabricated concrete column, and the steel pipe butt pipe is fixedly installed in the triangular support.

[0012] The utility model has the advantages that, compared with the prior art,

[0013] The utility model adopts the prefabricated concrete column, reduces the mud solidification time, guarantees the safety of the well sealing process, and is multi-section plugging during construction, so that the well sealing anti-seepage is greatly enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure view (when the construction process) of the utility model;

[0015] Figure 2 It is the structure view (when the construction process) of the utility model;

[0016] Figure 3 It is the steel plate with round hole perspective view of the utility model.

[0017] Marked as in the drawing: 1, the well of precipitation;2, the well sealing layer group;201, the gravel concrete mixed layer;202, the first layer micro-expansion concrete layer;203, prefabricated concrete column;204, the second layer micro-expansion concrete layer;205, the steel plate with round hole;206, the third layer micro-expansion concrete layer;3, construction component;301, the base pit bottom cushion layer;302, triangular support;4, round steel plate;5, prefabricated concrete column fixed component;501, steel pipe;502, steel pipe butt pipe;6, through -hole. DETAILED DESCRIPTION

[0018] In the description of the utility model, it needs to be explained that the orientation or position relation of the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0019] In the description of the utility model, it is to be explained that, unless there is definite stipulation and limitation, the term "mount", "link", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be direct connection, also can be indirect connection through intermediate medium, can be two element inside intercommunication, for the ordinary skilled in the art, the above-mentioned term can be understood in the utility model with concrete meaning according to specific circumstances.

[0020] The following will be described in detail with reference to the accompanying drawings Figures 1-3 Further illustrate the utility model.

[0021] In order to solve the problems in the background art, the present application proposes the following technical scheme: a foundation pit relief well well-sealing structure.

[0022] In the specific technical scheme, it comprises a dewatering well 1, a well-sealing layer group 2 and a construction assembly 3, the dewatering well 1 is located in the foundation pit, the well-sealing layer group 2 is arranged in the dewatering well 1, the well-sealing layer group 2 is composed of a broken stone concrete mixed layer 201, a first layer of micro-expansion concrete layer 202, a prefabricated concrete column 203, a second layer of micro-expansion concrete layer 204, a circular-hole steel plate 205 and a third layer of micro-expansion concrete layer 206, the broken stone concrete mixed layer 201, the first layer of micro-expansion concrete layer 202, the prefabricated concrete column 203, the second layer of micro-expansion concrete layer 204, the circular-hole steel plate 205 and the third layer of micro-expansion concrete layer 206 are sequentially filled from bottom to top, and the safety and stability of the well-sealing of the dewatering well 1 can be improved through the well-sealing layer group 2.

[0023] The construction steps of the structure are as follows: firstly, the dewatering well 1 is inserted into the soil layer at the bottom of the foundation pit, under the condition that the water level of the foundation pit is stable, the broken stone is filled in the dewatering well 1 first, then the micro-expansion concrete is filled, the micro-expansion concrete fills and blocks the gaps of the broken stone to form the broken stone concrete mixed layer 201, the micro-expansion concrete higher than the broken stone concrete mixed layer 201 is the first layer of micro-expansion concrete layer 202, after the first layer of micro-expansion concrete layer 202 fills the gaps of the broken stone sufficiently, the prefabricated concrete column 203 is lowered to a suitable position and then the second layer of micro-expansion concrete layer 204 is poured above it after solidification, then the circular-hole steel plate 205 is welded, and then the pouring of the third layer of micro-expansion concrete layer 206 is carried out to complete the well-sealing structure.

[0024] In the specific technical scheme, refer to Figure 1As shown, the construction assembly 3 includes a foundation pit bottom cushion 301 located outside the top of the dewatering well 1 and a triangular support 302 located on the top of the dewatering well 1, the triangular support 302 is fixedly installed on the top of the foundation pit bottom cushion 301, a prefabricated concrete column fixing assembly 5 is arranged in the triangular support 302, the prefabricated concrete column fixing assembly 5 includes a steel pipe 501 arranged in the prefabricated concrete column 203 and a steel pipe butt joint pipe 502 fixedly installed in the triangular support 302, a through hole 6 is formed in a circular hole steel plate 205, the bottom of the steel pipe butt joint pipe 502 passes through the through hole 6 and is engaged with the steel pipe 501, and the circular hole steel plate 205 is welded on the top of the steel pipe 501, so that the construction operation of the prefabricated concrete column 203 can be completed through the construction assembly 3 and the prefabricated concrete column fixing assembly 5.

[0025] In the specific technical scheme, with reference to Figure 2 As shown, a circular steel plate 4 is welded on the top of the dewatering well 1, the circular steel plate 4 is located on the top of the third layer of micro-expansion concrete layer 206, after the internal structure is processed, the circular steel plate 4 is welded above the third layer of micro-expansion concrete layer 206, and finally the micro-expansion concrete is poured at the connection between the upper dewatering well 1 and the cushion layer.

[0026] In order for those skilled in the art to fully understand the technical scheme, the present application is made as follows:

[0027] The structure is inserted into the soil layer at the bottom of the foundation pit during construction; under the condition that the water level in the foundation pit is stable, gravel is first filled into the dewatering well 1, and then micro-expanding concrete is filled, the micro-expanding concrete fills the gaps between the gravels to form a gravel-concrete mixed layer 201, the micro-expanding concrete above the gravel-concrete mixed layer 201 is a first layer of micro-expanding concrete layer 202, after the micro-expanding concrete fills the gaps between the gravels, a prefabricated concrete column 203 (the diameter of the prefabricated concrete column 203 is slightly smaller than the inner diameter of the dewatering well 1) is slowly lowered through a triangular support 302, (the prefabricated concrete column 203 and the steel pipe 501 are a prefabricated combination, the steel pipe butt pipe 502 connects the pipes, the steel pipe 501 and the prefabricated concrete column 203 combination are fixed through the triangular support 302, the triangular support 302 can adjust the position of the steel pipe 501 and the prefabricated concrete column 203 combination), the position is adjusted so that the center of the cross section of the steel pipe 501 coincides with the center of the cross section of the dewatering well 1, during the lowering process, the lower concrete flows upward through the gap between the prefabricated concrete column 203 and the dewatering well 1 due to the extrusion caused by the bottom of the prefabricated concrete column 203 contacting the un-solidified first layer of micro-expanding concrete layer 202, when the concrete flows to the same height as the upper surface of the prefabricated concrete column 203, the position of the prefabricated concrete column 203 is fixed through the triangular support 302 (compared with pouring concrete from the top after lowering the prefabricated concrete column 203, extruding the lower concrete can better seal the gap), after the concrete solidifies, a second layer of micro-expanding concrete layer 204 is poured (since the gap between the prefabricated concrete column 203 and the dewatering well 1 may decrease slightly during the previous concrete solidification process due to insufficient gap filling, pouring the second layer of micro-expanding concrete layer 204 serves to strengthen the second layer of well sealing and prevent seepage, and also to fill and stabilize the previous gap), after the concrete solidifies, the steel pipe butt pipe 502 is used to disassemble the steel pipe butt pipe 502 and the triangular support 302, and a steel plate 205 with a circular hole is welded above the second layer of micro-expanding concrete layer 204 (the steel plate 205 with a circular hole has a circular hole with a diameter slightly larger than the outer diameter of the steel pipe 501 and an overall diameter slightly smaller than the inner diameter of the dewatering well 1, the circular hole passes through the steel pipe 501, and the steel pipe 501 and the dewatering well 1 are integrally welded through welding technology), after welding is stable, the third layer of micro-expanding concrete layer 206 is poured, after it solidifies, a circular steel plate 4 is welded above, and finally, micro-expanding concrete is poured at the connection between the upper dewatering well 1 and the cushion layer.

[0028] The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the conventional connection mode is adopted in the circuit connection in the prior art, and the contents not described in detail in the description belong to the prior art known by the professional technical personnel in the field.

[0029] Although the embodiments of the utility model have been shown and described, the scope of the utility model is defined by the appended claims and their equivalents for those skilled in the art.

Claims

1. A sealing structure for a foundation pit decompression well, comprising a dewatering well (1), a sealing layer group (2), and construction components (3), characterized in that, The dewatering well (1) is located inside the foundation pit. The sealing layer group (2) is set inside the dewatering well (1). The sealing layer group (2) consists of a crushed stone concrete mixed layer (201), a first layer of micro-expansion concrete (202), a precast concrete column (203), a second layer of micro-expansion concrete (204), a steel plate with round holes (205), and a third layer of micro-expansion concrete (206). The crushed stone concrete mixed layer (201), the first layer of micro-expansion concrete (202), the precast concrete column (203), the second layer of micro-expansion concrete (204), the steel plate with round holes (205), and the third layer of micro-expansion concrete (206) are filled sequentially from bottom to top.

2. The well sealing structure for a pit relief well according to claim 1, characterized in that, The construction component (3) includes a bottom cushion layer (301) and a triangular support (302), wherein the bottom cushion layer (301) is located on the outer side of the top of the dewatering well (1).

3. The well sealing structure for a pit relief well according to claim 2, characterized in that, The triangular bracket (302) is located at the top of the dewatering well (1), and the triangular bracket (302) is fixedly installed on the top of the bottom cushion layer (301) of the foundation pit.

4. The well sealing structure for a pit pressure relief well according to claim 2, characterized in that, The triangular bracket (302) is provided with a precast concrete column fixing component (5), which includes a steel pipe (501) and a steel pipe connecting pipe (502).

5. The well sealing structure for a pit relief well according to claim 4, characterized in that, The steel pipe (501) is installed inside the precast concrete column (203), and the steel pipe connecting pipe (502) is fixedly installed inside the triangular bracket (302).

6. The well sealing structure for a foundation pit relief well according to claim 5, characterized in that, The steel plate with round hole (205) has a through hole (6) inside. The bottom of the steel pipe connecting pipe (502) passes through the through hole (6) and is engaged with the steel pipe (501). The steel plate with round hole (205) is welded to the top of the steel pipe (501).

7. The well sealing structure for a foundation pit relief well according to claim 1, characterized in that, A circular steel plate (4) is welded to the top of the dewatering well (1), and the circular steel plate (4) is located on top of the third layer of micro-expansion concrete (206).

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