A drainage device for the rock-soil interface in a deep foundation pit of a subway

Abstract

This utility model provides a drainage device for the soil-rock interface in deep foundation pits of subways, effectively solving the problems of long drainage pipes, difficult filter screen disassembly and cleaning, inability to clean online, and easy entry of sand and gravel into the drainage pipe in existing technologies. The solution includes a sleeve and a filter screen. The sleeve is arc-shaped, with its end extending beyond the pit surface. Multiple elongated grooves are formed on the side wall of the sleeve, creating a fence-like structure. The filter screen is a ring-shaped cylindrical structure, fitted onto the sleeve, and the filter screen can rotate within the sleeve. This utility model has an ingenious structure, constantly preventing sand and gravel from entering the drainage pipe, enabling online cleaning of the filter screen without it extending above the ground, greatly facilitating cleaning operations for maintenance personnel.

Description

Technical Field

[0001] This utility model relates to the field of subway foundation pit drainage technology, and in particular to a drainage device for the rock-soil interface of a deep subway foundation pit. Background Technology

[0002] In existing technologies, dewatering of foundation pits generally employs external well dewatering. The interface between sandy gravel and mudstone is often located on the sidewall of the main foundation pit or near its bottom. A drainage ditch is excavated along the length of the foundation pit, with collection wells placed at intervals along the middle of the ditch. Water is pumped from outside the pit when the water level in the collection wells is high. Currently, drainage pipes are typically installed on the sides of the drainage ditch, extending into the soil. However, due to the high viscosity of the soil, it easily clogs the drainage pipe after entering with water, thus affecting the drainage effect. To address this, patent document CN220433707U discloses a construction drainage device for the soil-rock interface of a deep foundation pit in a subway system. A drainage pipe is inserted into the soil-rock interface, and a compatible porous filter cartridge is placed in the upper part of the drainage pipe's inner cavity. The porous filter cartridge has a porous structure to prevent soil from entering the drainage pipe and causing blockage. There are also obvious defects in its use. First, cleaning the filter screen requires pulling up the sealing cover plate 73 and then pulling it out, which is quite cumbersome. This also means that the device needs to be made so that the upper end of the drain pipe 7 extends out of the ground. The entire drain pipe is too long, which is also inconvenient for cleaning. Second, when the filter screen is pulled out, sand and soil can easily enter the drain pipe, causing the joint surface to loosen and leading to instability. At the same time, the entry of sand and gravel makes it difficult to insert the filter cartridge or cause it to get stuck.

[0003] To address the aforementioned issues, a drainage device for the rock-soil interface in deep foundation pits of subways is provided. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a drainage device for the rock-soil interface of deep foundation pits in subways, which effectively solves the problems of long drainage pipes, difficult disassembly and cleaning of filter screens, inability to clean online, and easy entry of sand and gravel into the drainage pipes in the prior art.

[0005] The technical solution includes a sleeve and a filter screen. The sleeve is arc-shaped, with its end extending out of the pit surface. Multiple long grooves are formed on the side wall of the sleeve to create a fence-like structure. The filter screen is an annular cylindrical structure. The sleeve is fitted onto the filter screen, and the filter screen can rotate inside the sleeve.

[0006] Preferably, the filter screen is made of a rigid filter plate.

[0007] Preferably, the sleeve is arranged in an inclined shape with the middle part higher than both ends.

[0008] This utility model has a clever structure that can prevent sand and gravel from entering the drain pipe at all times, and can clean the filter screen online without extending it above the ground, greatly facilitating the cleaning work of maintenance personnel. Attached Figure Description

[0009] Figure 1 This is the front sectional view of the present invention.

[0010] Figure 2 This is a side sectional view of the present invention.

[0011] Figure 3 This is a schematic diagram of the installation of this utility model.

[0012] Figure 4 This is a structural diagram of the sleeve in this utility model.

[0013] Figure 5 This is a structural diagram of the filter screen in this utility model. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0015] Depend on Figures 1 to 5 The present invention includes a sleeve 1 and a filter screen 2. The sleeve 1 is arc-shaped, with its end extending out of the pit surface. Multiple elongated grooves 3 are formed on the side wall of the sleeve 1 to form a fence-like structure. The filter screen 2 is an annular cylindrical structure. The sleeve 1 is fitted onto the filter screen 2, and the filter screen 2 can rotate inside the sleeve 1.

[0016] The filter screen 2 is made of a rigid filter plate.

[0017] The sleeve 1 is arranged in an inclined shape with the middle part higher than both ends.

[0018] It is worth noting that this structure is installed on the side wall of the drainage pipe of the foundation pit, and the part of the filter screen 2 placed outside the sleeve 1 is inside the drainage pipe.

[0019] When using, such as Figure 1 , 2 As shown in Figure 3, water at the rock-soil interface first enters the casing 1, where large sand and gravel particles are blocked. Then, it enters the filter screen 2, slopes downwards along the inside of the filter screen 2, and finally flows out into the drain pipe. When cleaning is required, simply rotate the filter screen 2 and use a high-pressure water gun to clean the filter holes that are blocked. The cleaning process does not affect normal drainage, and sand and gravel have no chance to enter the cavity of the casing 1, thus achieving a good purpose of drainage and sand blocking.

[0020] This utility model has a clever structure that can prevent sand and gravel from entering the drain pipe at all times, and can clean the filter screen 2 online without extending it to the ground, greatly facilitating the cleaning work of maintenance personnel.

Claims

1. A subway deep foundation rock-soil interface drainage device, characterized in that, Includes a sleeve (1) and a filter screen (2). The sleeve (1) is arc-shaped, with the end of the sleeve (1) extending out of the surface of the pit. Multiple long grooves (3) are opened on the side wall of the sleeve (1) to form a fence-like structure. The filter screen (2) is an annular cylindrical structure. The sleeve (1) is fitted onto the filter screen (2), and the filter screen (2) can rotate inside the sleeve (1).

2. The rock-soil interface drainage device for a subway deep foundation pit according to claim 1, characterized in that, The filter screen (2) is made of a rigid filter plate.

3. The rock-soil interface drainage device for a subway deep foundation pit according to claim 1, characterized in that, The sleeve (1) is arranged in an inclined manner with the middle part higher than both ends.

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