Plugging structure for dewatering well in foundation pit

Abstract

The utility model relates to the technical field of building construction, and discloses a dewatering well plugging structure in a foundation pit, which comprises a lower sealing plate, a sleeve is vertically arranged on the lower sealing plate, and a plugging hole communicated with the sleeve is arranged on the lower sealing plate in a penetrating manner; a water stop ring is arranged on the sleeve, and a plugging cover is arranged at the top end of the sleeve; a cushion layer is arranged on the lower sealing plate, a waterproof layer is arranged on the cushion layer, and a protective layer is arranged at the top end of the waterproof layer; the well mouth plugging device is simple in structure, convenient to install and operate and capable of greatly enhancing tightness of well mouth plugging, guaranteeing the sealing effect and meanwhile improving the construction efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a blocking structure for a dewatering well in a foundation pit. Background Art

[0002] Traditional technology usually uses quick-hardening cement, plugging mortar, etc. to seal the dewatering well in the foundation pit. This method cannot seal the wellhead tightly, and the construction of the waterproof layer is limited, affecting the overall construction deployment. When using conventional casing sealing devices, there are still sealing problems at the connection between the casing and the dewatering well, resulting in poor sealing, which brings potential hidden dangers in the future. In addition, when sealing the existing casing, welding or flange connection is usually used, which cannot achieve rapid sealing of the pipe mouth, affecting construction efficiency. Utility Model Content

[0003] The utility model aims to provide a drainage well sealing structure in a foundation pit, which has a simple structure and is easy to install and operate, and can greatly enhance the tightness of the wellhead sealing, ensure the sealing effect, and improve the construction efficiency.

[0004] The utility model adopts the following technical solutions:

[0005] A sealing structure for a drainage well in a foundation pit comprises a lower sealing plate, a casing is vertically arranged on the lower sealing plate, and a sealing hole communicating with the casing is penetrated through the lower sealing plate; a water stop ring is arranged on the casing, and a sealing cover is arranged on the top of the casing; a cushion layer is arranged on the lower sealing plate, a waterproof layer is arranged on the cushion layer, and a protective layer is arranged on the top of the waterproof layer.

[0006] Preferably, the lower sealing plate is a steel plate with a square cross-section, and the sleeve is a steel pipe.

[0007] Preferably, the sleeve is fixed to the lower sealing plate by welding.

[0008] Preferably, a rubber pad is provided at the bottom of the lower sealing plate, and a sealing hole is opened through the rubber pad at a position corresponding to the sealing hole. The sealing hole is a countersunk hole, and the inner diameter of the external large hole matches the diameter of the precipitation well. The bottom end of the casing passes through the bottom of the sealing hole and is fixedly connected to the lower sealing plate by welding, and the welding point is located in the space sealed by the rubber pad.

[0009] Preferably, the blocking cover is threadedly connected to the casing.

[0010] Preferably, a sealing gasket is provided inside the blocking cover.

[0011] Preferably, after the sealing cover is threadedly connected to the casing, the bottom end thereof tightly abuts against the water stop ring.

[0012] Preferably, after being laid on the cushion layer, the waterproof layer extends upward to the outside of the casing and abuts against the bottom of the water stop ring.

[0013] Preferably, the upper end of the lower sealing plate is connected to the sleeve by welding.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model is convenient to construct and install, does not affect the subsequent waterproof and raft construction, has a fast plugging speed, has a good water-stopping effect, and greatly improves the construction efficiency. By setting a lower sealing plate and sequentially setting a cushion layer, a waterproof layer, and a protective layer on the lower sealing plate, the tightness of the connection between the casing and the precipitation well is greatly improved, and the poor sealing at the connection between the precipitation well and the casing is avoided. The setting of the water stop ring on the casing can increase the path of water infiltration, thereby achieving an anti-seepage effect by increasing the infiltration resistance, further avoiding the occurrence of water seepage, and ensuring the plugging effect of the precipitation well. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0016] Figure 2 A schematic diagram of the connection between the lower sealing plate and the sleeve in an embodiment of the present application;

[0017] Figure 3 for Figure 2 Schematic diagram of the structure after the middle and lower sealing plates are turned over;

[0018] Figure 4 It is a cross-sectional view of the sealing cover according to an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings and embodiments:

[0020] like Figures 1 to 4As shown, the utility model described in the present invention is a drainage well sealing structure in a foundation pit, comprising a lower sealing plate 1, which is preferably a steel plate with a square cross-section, a casing 2 is vertically arranged on the lower sealing plate 1, and the casing 2 is preferably a steel pipe. A sealing hole 3 which is connected to the casing 2 is penetrated through the lower sealing plate 1, and the casing 2 is connected to the inside of the drainage well through the sealing hole 3; a water stop ring 4 is arranged on the casing 2, and a sealing cover 5 is arranged on the top of the casing 2, and the sealing cover 5 is preferably connected to the casing 2 by a threaded manner to improve the efficiency of subsequent sealing of the top of the casing 2; wherein a sealing gasket 6 is arranged in the sealing cover 5 to improve the sealing effect of the casing 2 and prevent groundwater from seeping out from the pipe mouth of the casing 2; in addition, when the sealing cover 5 is connected to the casing 2, the bottom end of the sealing cover 5 is tightly abutted against the top of the water stop ring 4 to further improve the sealing performance. A cushion layer 7 is provided on the lower sealing plate 1. The cushion layer 7 is cast with concrete and is usually 100 mm thick. A waterproof layer 8 is provided on the cushion layer 7. The waterproof layer 8 is preferably made of waterproof coiled material. The raw materials are easily available, the cost is low and the waterproof effect is good. Preferably, after the waterproof layer 8 is laid on the cushion layer 7, it extends upward to the outside of the casing 2, wraps around the casing 2 and abuts against the bottom of the water stop ring 4 to achieve all-round waterproof treatment and enhance the sealing and waterproof performance. A protective layer 9 is provided on the top of the waterproof layer 8. The protective layer 9 is used to reinforce and position the waterproof layer 8. The protective layer 9 is usually the same grade of concrete as that used in the subsequent foundation raft slab casting to ensure the overall casting effect.

[0021] Furthermore, in this embodiment, the casing 2 and the lower sealing plate 1 are fixed by welding to enhance the stability and tightness of the connection between the casing 2 and the lower sealing plate 1. Among them, a rubber pad 10 is preferably provided at the bottom of the lower sealing plate 1, and a sealing hole 11 is provided through the rubber pad 10 at a position corresponding to the plugging hole 3. The sealing hole 11 is arranged in the form of a countersunk hole, and the small hole in the middle matches the plugging hole 3, and the inner diameter of the large hole on the outside matches the wellhead diameter of the precipitation well, so as to achieve a full-scale sealing of the wellhead after the casing is set at the top of the wellhead. The bottom end of the casing 2 passes through the bottom of the plugging hole 3 and is fixedly connected to the lower sealing plate 1 by welding. The welding point is located in the space sealed by the rubber pad 10 to avoid water seepage at the welding point. During installation, the sealing hole 11 is sleeved on the outside of the wellhead of the precipitation well, and the rubber pad 10 is used to achieve close contact with the wellhead, further enhancing the tightness of the connection between the lower sealing plate 1 and the precipitation well. In addition, the upper end of the lower sealing plate 1 and the sleeve 2 are also connected by welding, and the stability and tightness of the connection between the sleeve 2 and the lower sealing plate 1 can be enhanced by welding the upper and lower ends.

[0022] When the utility model is used, after the construction of the drainage well in the foundation pit is completed, the depth of the pipe well and the operation of the equipment such as the water pump are checked, and the plugging device is installed after ensuring normal precipitation. The lower sealing plate 1 is placed at the bottom elevation of the foundation raft, and then the foundation cushion layer 7 concrete is poured. The conventional thickness of the cushion layer 7 concrete is 100mm. Then the waterproof layer 8 is constructed, and the waterproof coil is wrapped around the casing 2 to the position of the water stop ring 4, and then the protective layer 9 is poured, and finally the steel bars at the foundation raft are tied. Usually, the water pump embedding method is adopted in areas with high water levels. Dry mixed concrete is put into the well while pumping water. When the mixed material is backfilled to 500mm below the wellhead, the water pump is stopped, the power supply is cut off, the water pipe and the wire are quickly cut off, and then the mixed dry mixed material is quickly filled to the bottom of the cushion layer 7. The upper part is filled with the same grade concrete of the foundation raft, and the concrete is poured to the top of the casing 2. Then the top of the casing 2 is tightened with the plugging cover 5. The whole operation is simple and fast, the structure is simple, the plugging effect is good, and the practicability is strong.

Claims

1. A plugging structure for a drainage well in a foundation pit, characterized in that: It comprises a lower sealing plate, on which a sleeve is vertically arranged, and on which a sealing hole communicating with the sleeve is penetrated; a water stop ring is arranged on the sleeve, and a sealing cover is arranged on the top of the sleeve; a cushion layer is arranged on the lower sealing plate, a waterproof layer is arranged on the cushion layer, and a protective layer is arranged on the top of the waterproof layer.

2. The sealing structure for the drainage well in the foundation pit according to claim 1 is characterized in that: The lower sealing plate is a steel plate with a square cross section, and the sleeve is a steel pipe.

3. The sealing structure for the drainage well in the foundation pit according to claim 2 is characterized in that: The sleeve is fixed to the lower sealing plate by welding.

4. The sealing structure for the drainage well in the foundation pit according to claim 1 is characterized in that: A rubber pad is provided at the bottom of the lower sealing plate, and a sealing hole is opened through the rubber pad at a position corresponding to the sealing hole. The sealing hole is a countersunk hole, and the inner diameter of the external large hole matches the diameter of the precipitation well. The bottom end of the casing passes through the bottom of the sealing hole and is fixedly connected to the lower sealing plate by welding, and the welding point is located in the space sealed by the rubber pad.

5. The plugging structure for the drainage well in the foundation pit according to claim 1 is characterized by: The blocking cover is threadedly connected to the casing.

6. The sealing structure for the drainage well in the foundation pit according to claim 5 is characterized in that: A sealing gasket is arranged inside the blocking cover.

7. The plugging structure for the drainage well in the foundation pit according to claim 6 is characterized by: After the blocking cover is threadedly connected to the sleeve, the bottom end thereof is tightly abutted against the water stop ring.

8. The plugging structure for the drainage well in the foundation pit according to claim 1 is characterized by: After the waterproof layer is laid on the cushion layer, it extends upward to the outside of the sleeve and abuts against the bottom of the water stop ring.

9. The plugging structure for the drainage well in the foundation pit according to claim 4, characterized in that: The upper end of the lower sealing plate is connected to the sleeve by welding.

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