CN-117344769-B - Pressure bearing layer dewatering well plugging device and method

CN117344769BCN 117344769 BCN117344769 BCN 117344769BCN-117344769-B

Abstract

The invention relates to the technical field of dewatering well plugging, in particular to a device and a method for plugging a dewatering well on a pressure bearing layer. The device comprises a device body, wherein the device body is wrapped with a first preset piece, the first preset piece is used for being placed into an existing dewatering well, the first preset piece comprises a hollow well pipe, an inner water stop steel plate is coaxially installed at a pipe orifice of one end of the well pipe, a water passing hole used for being inserted into a galvanized steel pipe is formed in the inner water stop steel plate, and an annular installation groove used for installing water swelling glue is formed in the inner water stop steel plate. The invention can realize circumferential inward compaction and downward compaction of the water-swellable glue through the cooperation between the compression bar and the second annular groove and the first annular groove, so that constructors can conveniently compact the water-swellable glue at the lower part of the well pipe on the galvanized steel pipe on the premise of not entering the well pipe.

Inventors

Liu Genqiao
CHEN JIAREN
WANG ZHI
FANG ZHOU
LIU GUANGHUI
ZONG PENGCHENG
SU LIYANG
YANG HAOHUI
ZHU WENFEI

Assignees

中铁十局集团第四工程有限公司
中铁十局集团有限公司
南京上铁地方铁路开发有限公司

Dates

Publication Date: 20260512
Application Date: 20230822

Claims (6)

1. The pressure bearing layer dewatering well plugging device is characterized by comprising a device body (100), wherein the device body (100) comprises a first preset piece (110), and the first preset piece (110) is used for placing an existing dewatering well; The first preset piece (110) comprises a hollow well pipe (111), an inner water stop steel plate (112) is coaxially arranged at the pipe orifice of one end of the well pipe (111), a water passing hole (210) for inserting a galvanized steel pipe (120) is formed at the inner water stop steel plate (112), and an annular mounting groove (220) for mounting water swelling glue is formed at the inner water stop steel plate (112); The device body (100) further comprises a second preset piece (130), wherein the second preset piece (130) comprises a hoop assembly (131) used for clamping at the galvanized steel pipe (120), the hoop assembly (131) comprises a first hoop body and a second hoop body which are used for fastening connection, and one side of the first hoop body and one side of the second hoop body, which are close to the inner water stop steel plate (112), are respectively provided with a mounting ring (132) with a semicircular section; the mounting ring (132) is coaxially provided with a first annular groove (410) and a second annular groove (420) with T-shaped cross sections, the first annular groove (410) is positioned on one side close to the inner annular wall of the mounting ring (132), the second annular groove (420) is positioned on one side close to the outer annular wall of the mounting ring (132), the first annular grooves (410) at the two mounting rings (132) are mutually jointed to form a complete annular groove together, and the second annular grooves (420) at the two mounting rings (132) are mutually jointed to form a complete annular groove together; The first annular groove (410) and the second annular groove (420) are respectively extended to the outer wall of one side of the mounting ring (132) close to the inner water stop steel plate (112) and form an opening, a straight line where the extending direction of the notch of the first annular groove (410) is parallel to the axis of the mounting ring (132), a junction point is formed between the straight line where the extending direction of the notch of the second annular groove (420) is and the axis of the mounting ring (132), the junction point is used for mounting the water-swellable glue in the annular mounting groove (220), the first annular groove (410) and the second annular groove (420) respectively comprise an annular groove body, a first groove part (430) with a large inner diameter and a second groove part (440) with a small inner diameter are formed in the annular groove body, a plurality of protruding blocks (450) with arc-shaped surfaces are formed at the inner wall of one side of the first groove part (430) far from the second groove part (440), the plurality of protruding blocks (450) are arranged at intervals along the extending direction of the annular groove body, and the protruding blocks (450) in the annular groove body are arranged at the annular groove body; The device body (100) further comprises a third preset piece (140), the third preset piece (140) comprises a pressing rod (510), a spherical sliding block (520) is formed at the first end of the pressing rod (510), the sliding block (520) is used for being in sliding fit with the first annular groove (410) or the second annular groove (420), a plurality of protruding blocks (450) are matched with the annular groove body together to form a wavy sliding path of the sliding block (520), a pressing block (530) is formed at the second end of the pressing rod (510), a pressing surface (531) is formed at one side, close to the inner water stop steel plate (112), of the pressing block (530), and the pressing surface (531) is used for pressing water-swellable glue located at the annular mounting groove (220).
2. The pressure-bearing layer dewatering well plugging device according to claim 1, wherein an inner water stop flange (230) is further coaxially arranged in the well pipe (111), the inner water stop flange (230) is arranged on one side away from the inner water stop steel plate (112), and an annular side wall on the inner side of the inner water stop flange (230) is used for being in abutting fit with a pressure rod (510) located in the second annular groove (420).
3. The device of claim 1, wherein the first pre-set member (110) further comprises a first outer water stop plate (150) and a second outer water stop plate (160) coaxially mounted to the outer wall of the well pipe (111).
4. A method for plugging a bearing layer dewatering well, which is characterized in that the plugging device for the bearing layer dewatering well is adopted according to any one of claims 1-3, and comprises the following steps: step S1, a first preset piece (110) comprising a well pipe (111) and an inner water stop steel plate (112) is installed in an existing dewatering well; Step S2, installing water-swelling glue between the inner water-stopping steel plate (112) and the galvanized steel pipe (120), wherein the installation position is positioned at a connecting gap in the well pipe (111), and the water-swelling glue is pressed between the inner water-stopping steel plate (112) and the galvanized steel pipe (120) by adopting a second preset piece (130) and a third preset piece (140); S3, pouring bottom plate concrete and in-pipe concrete, and keeping precipitation during pouring; the whole process of the step S3 keeps precipitation, which specifically comprises the following steps: Step S31, before concrete pouring, arranging a ball valve at the galvanized steel pipe (120) above the water stop flange, wherein the ball valve is connected with the galvanized steel pipe (120) by adopting a bolt, and the upper end of the ball valve is connected with a drain pipe; S32, before the concrete of the bottom plate is poured, coating water-swelling water-stop glue on the surface of the outer water-stop steel plate; S33, carrying out layered casting on the bottom plate concrete, simultaneously carrying out layered casting on the concrete in the pipe during casting, carrying out layered vibration until the concrete in the pipe is cast below the water stop flange and stopping casting; S34, using a first water-stopping steel plate to be connected with a water-stopping flange in the galvanized steel pipe (120) through bolts, and coating water-swelling water-stopping glue between the first water-stopping steel plate and the water-stopping flange; S4, stopping dewatering, continuing pouring concrete in the pipe until the concrete is parallel to the surface of the bottom plate, and finally completing well sealing; The step S4 specifically comprises the following steps: s41, stopping precipitation, screwing the ball valve, and closing the ball valve; s42, removing a water pipe at the upper part of the ball valve; S43, pouring concrete to a position 5cm away from the bottom plate surface layer; step S44, welding a second water stop steel plate; and S45, pouring residual concrete to be parallel to the bottom plate surface, and cutting off the redundant steel pipes.
5. The method for plugging a dewatering well in a bearing layer according to claim 4, wherein the step S1 specifically comprises the following steps: S11, after a foundation pit is excavated and before a cushion layer is poured, a water pump in a dewatering well is lifted, and a drainage PVC pipe is replaced by a galvanized steel pipe (120) and is connected with a water outlet bolt of the water pump; step S12, after one end of the galvanized steel pipe (120) is connected with a water pump, the other end of the galvanized steel pipe passes through a water passing hole (210) at the bottom of the first preset piece (110); and step S13, placing the first preset piece (110), the galvanized steel pipe (120) connected with the first preset piece (110) and a water pump into an existing dewatering well, wherein the first preset piece (110) is in socket connection with the existing dewatering well, and the water pump is pumped into water in the well to continue dewatering.
6. The method for plugging a dewatering well in a bearing layer according to claim 4, wherein the step S2 specifically comprises the following steps: s21, pre-installing water swelling glue with glue on the inner side wall in an annular installation groove (220) at the inner water stop steel plate (112) before the galvanized steel pipe (120) passes through a water passing hole (210) at the bottom; Step S22, a galvanized steel pipe (120) passes through the water passing hole (210), and before the first anchor ear and the second anchor ear are fastened and connected, a sliding block (520) in a third preset piece (140) is directly slid into the second annular groove (420) from a gap between the first anchor ear and the second anchor ear; Step S23, fastening and installing the anchor ear assembly (131) at the galvanized steel pipe (120), wherein at the moment, a first annular groove (410) and a second annular groove (420) at the two installation rings (132) are mutually jointed to form a whole circle; Step S24, a pressing rod (510) is moved along the circumferential direction of the well pipe (111), the pressing rod (510) drives a sliding block (520) to move in a second sliding groove which is obliquely arranged, the sliding block (520) forms an obliquely corresponding pressing rod (510) and a pressing block (530) in the second sliding groove, the obliquely corresponding pressing rod (510) forms an abutting trend with an inner water stop flange (230) positioned in the well pipe (111) to act as a supporting point to support the pressing rod (510), and the obliquely pressing block (530) forms a circumferential inward abutting trend with water swelling glue positioned at the annular mounting groove (220); Step S25, in the process of circumferentially moving the compression bar (510) along the well pipe (111), each time the sliding block (520) passes through the convex block (450) in the second sliding groove, the compression bar (510) forms a trend of inclined up-and-down fluctuation, and each time the compression bar (510) is pressed down, constructors force downwards to drive the pressing block (530) to circumferentially inwards squeeze the water-swellable glue to compact the water-swellable glue at the outer wall of the galvanized steel pipe (120); S26, unfastening the hoop assembly (131), and then moving the sliding block (520) out of the second annular groove (420) and then into the first annular groove (410); Step S27, a pressure bar (510) is moved along the circumference of the well pipe (111) again, and in the moving process, each time the sliding block (520) passes through the convex block (450) in the first annular groove (410), the pressure bar (510) forms a vertical up-and-down fluctuation trend along with the convex block, and when the pressure bar (510) is pressed down each time, an operator downwards forces the water-swelling adhesive to be pressed into a gap between the galvanized steel pipe (120) and the inner water-stop steel plate (112) downwards, and the pressure bar (510) is moved along the circumference of the well pipe (111) for a plurality of circles; step S28, the positions of the two mounting rings (132) are exchanged, and then the steps S22 to S27 are repeated; And S29, after the installation is completed, the hoop assembly (131) is released, and the second preset piece (130) and the third preset piece (140) are removed from the well pipe (111).

Description

Pressure bearing layer dewatering well plugging device and method Technical Field The invention relates to the technical field of dewatering well plugging, in particular to a device and a method for plugging a dewatering well on a pressure bearing layer. Background The foundation pit dewatering is taken as an important construction measure in foundation pit construction, and the quality of the dewatering effect directly relates to the stability and safety of the foundation pit, and restricts the construction progress. In areas with abundant groundwater and higher water level of bearing layers, foundation pit dewatering needs to penetrate through and modify the construction period of the foundation pit, and after the foundation pit bottom foundation concrete is poured, the dewatering well still needs to be kept dewatering until the structure construction is completed, dewatering is stopped, and the dewatering well is closed. However, in the sealing process of the pressure-bearing dewatering well, the sealing effect of the dewatering well is poor, so that water gushes in the well in the sealing process or water seepage phenomenon after sealing is caused, and the engineering quality is seriously influenced. Disclosure of Invention The invention provides a plugging device and a plugging method for a dewatering well of a bearing layer, which can overcome certain or certain defects in the prior art. The invention relates to a plugging device for a pressure-bearing layer dewatering well, which comprises a device body, wherein the device body is wrapped with a first preset piece, and the first preset piece is used for placing an existing dewatering well; the first preset piece comprises a hollow well pipe, an inner water stop steel plate is coaxially arranged at the pipe orifice of one end of the well pipe, a water passing hole for inserting a galvanized steel pipe is formed at the inner water stop steel plate, and an annular mounting groove for mounting water swelling glue is formed at the inner water stop steel plate. Specifically, when the device body is used, the first preset piece can be directly installed in a dewatering well, meanwhile, the inner water stop steel plate arranged at the mouth of the well pipe can be used for sealing the well pipe and the outside, further, the annular installation groove is preset at the inner water stop steel plate, constructors can place water swelling glue in the annular installation groove in advance, and then the galvanized steel pipe passes through the water passing hole from top to bottom, but at the moment, the pre-installed water swelling glue is difficult to form tight connection with the galvanized steel pipe, so that the water swelling glue is difficult to form better blocking for gaps, and the sealing effect of the subsequent dewatering well is directly influenced; In addition, the water-swellable glue is arranged in the well pipe, and the well pipe needs to be placed in the dewatering well, so that the depth of the well pipe is large, and an operator can hardly and conveniently compact the water-swellable glue at the lower port of the well pipe. Therefore, the device body of the present invention further comprises a second preset piece and a third preset piece, and the specific structures of the second preset piece and the third preset piece are as follows: Preferably, the device body further comprises a second preset piece, the second preset piece comprises a hoop assembly used for being clamped at the galvanized steel pipe, the hoop assembly comprises a first hoop body and a second hoop body which are used for being fastened and connected, and one side, close to the inner water stop steel plate, of each of the first hoop body and the second hoop body is provided with a mounting ring with a semicircular section. Preferably, the mounting ring is coaxially provided with a first annular groove and a second annular groove with T-shaped sections, wherein the first annular groove is positioned on one side close to the inner annular wall of the mounting ring, and the second annular groove is positioned on one side close to the outer annular wall of the mounting ring; Preferably, the notches of the first annular groove and the second annular groove extend to the outer wall of one side of the mounting ring near the inner water stop steel plate and form an opening; the straight line of the extending direction of the notch of the first annular groove is parallel to the axis of the mounting ring, the straight line of the extending direction of the notch of the second annular groove forms an intersection point with the axis of the mounting ring, the intersection point is positioned at an annular mounting groove for mounting water swelling glue, the first annular groove and the second annular groove both comprise an annular groove body, a first groove part with a large inner diameter and a second groove part with a small inner diameter are formed in the annular groove body, a