Particle loss prevention dewatering well structure adjacent to existing station
By using permeable pipes, gravel, fine sand, and sponge to form a multi-stage reverse filter structure in the dewatering well structure, and using fixed anchor bolts and pulley assemblies to support the permeable pipes, the problem of sand and soil particle loss during dewatering was solved, ensuring the safety and stability of the existing station.
Patent Information
- Application Number
- CN202520246204.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-17
AI Technical Summary
During precipitation, sand particles may be washed away with the water flow, causing damage to the geological structure and affecting the safety and stability of existing stations.
Design a dewatering well structure near an existing station to prevent particle loss. The structure uses permeable pipes, gravel, fine sand and sponge to form a multi-stage reverse filter structure. The permeable pipes are supported vertically by fixed anchors, support rings, support rods and limit pulley assemblies to prevent sand and gravel particles from being lost.
It effectively prevents sand and gravel particles from being lost with the water flow, avoids piping, protects the safety and stability of existing tunnels, and ensures the effectiveness of the multi-stage reverse filter structure.
Smart Images
Figure CN223922227U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field, specifically to a precipitation well structure for preventing particulate matter loss near an existing station. Background Technology
[0002] When constructing near an existing station, excavation of the foundation pit is unavoidable. To ensure the stability of the pit, dewatering is usually required. However, the strata in the construction area are mainly composed of sand and gravel. During dewatering, sand particles may be washed away with the water flow, leading to damage to the stratum structure. This particle loss phenomenon, known as "piping," can seriously affect the safety and stability of the existing tunnel. Therefore, a dewatering well structure to prevent particle loss near the existing station was designed. Utility Model Content
[0003] The purpose of this utility model is to provide a precipitation well structure for preventing particle loss near existing stations, in order to solve the problem mentioned in the background art that sand particles may be lost with the water flow during precipitation, leading to damage to the stratum structure and seriously affecting the safety and stability of existing stations.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a dewatering well structure for preventing particulate matter loss near an existing station, comprising an existing tunnel and a newly constructed foundation pit above the existing tunnel, characterized in that: a dewatering well body is excavated around the existing tunnel and the newly constructed foundation pit; a permeable pipe is installed inside the dewatering well body; gravel, fine sand, and sponge are filled between the dewatering well body and the permeable pipe; a dewatering well limiting component is installed on the top of the dewatering well body; the dewatering well limiting component includes a fixed anchor rod, the fixed anchor rod is inserted into the ground around the top of the dewatering well body; a support ring is fixedly connected to the surface of the fixed anchor rod; a first limiting pulley is fixedly installed on the surface of the support ring; a support rod is fixedly connected to the surface of the support ring; a connecting ring is fixedly connected to the surface of the support rod; and a second limiting pulley is fixedly installed on the surface of the connecting ring.
[0005] Preferably, the dewatering well body is provided in four sets, and the dewatering well bodies are evenly distributed around the existing tunnel and the newly built foundation pit.
[0006] Preferably, the gravel, fine sand, and sponge are arranged in a tubular shape inside the dewatering well body, and the gravel, fine sand, and sponge are sequentially filled on the dewatering well body.
[0007] Preferably, multiple sets of fixed anchor rods are provided, and the fixed anchor rods are evenly distributed at the bottom of the support ring. The fixed anchor rods restrict the position of the dewatering well limiting component on the dewatering well body on the ground.
[0008] Preferably, the support ring supports the connecting ring through support rods, and multiple sets of support rods are provided, with the multiple sets of support rods evenly distributed between the support ring and the connecting ring.
[0009] Preferably, four sets of first limiting pulleys are provided, and the four sets of first limiting pulleys are evenly distributed in the inner ring of the support ring; four sets of second limiting pulleys are provided, and the four sets of second limiting pulleys are evenly distributed in the inner ring of the connecting ring.
[0010] Preferably, the permeable pipe passes through both the connecting ring and the support ring, and the permeable pipe is in contact with the surfaces of the first limiting pulley and the second limiting pulley.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. The dewatering well structure employs a multi-stage reverse filtration structure composed of gravel, fine sand, and sponge during the dewatering process through permeable pipes on the well body. This prevents sand and gravel particles from being lost with the water flow, effectively preventing piping and protecting the safety and stability of the existing tunnel.
[0013] 2. In this dewatering well structure, fixed anchor rods are inserted into the surrounding soil at the top of the dewatering well body, thereby restricting the position of the dewatering well limiting components at the top of the dewatering well body. Support rings, support rods, and connecting rings support the first and second limiting pulleys at the top of the dewatering well body. The first and second limiting pulleys guide the permeable pipe, ensuring that the permeable pipe remains vertical when inserted into the bottom of the dewatering well body. This ensures the uniformity of the filling of gravel, fine sand, and sponge between the dewatering well body and the permeable pipe, thereby ensuring the effectiveness of the multi-stage reverse filtration structure. Attached Figure Description
[0014] Figure 1 This is a top view of the overall structure of this utility model;
[0015] Figure 2 This is a front sectional view of the main structure of the precipitation well of this utility model;
[0016] Figure 3 This is a frontal three-dimensional sectional view of the main structure of the precipitation well of this utility model;
[0017] Figure 4 This is a frontal perspective three-dimensional schematic diagram of the structure of the dewatering well limiting component of this utility model;
[0018] Figure 5 This is a top view schematic diagram of the structure of the dewatering well limiting component of this utility model.
[0019] In the diagram: 1. Existing tunnel; 11. New foundation pit; 12. Dewatering well body; 2. Crushed stone; 21. Fine sand; 22. Sponge; 23. Permeable pipe; 3. Dewatering well limiting component; 31. Fixed anchor bolt; 32. Support ring; 33. First limiting pulley; 34. Support rod; 35. Connecting ring; 36. Second limiting pulley. Detailed Implementation
[0020] Please see Figure 1-5 One embodiment provided by this utility model:
[0021] A dewatering well structure for preventing particle loss near an existing station includes an existing tunnel and a newly constructed foundation pit above the existing tunnel. The structure is characterized by: a dewatering well body excavated around the existing tunnel and the new foundation pit; a permeable pipe installed inside the dewatering well body; and gravel, fine sand, and sponge filling the space between the dewatering well body and the permeable pipe. A dewatering well limiting component is installed at the top of the dewatering well body, including a fixed anchor rod inserted into the ground around the top of the dewatering well body. A support ring is fixedly connected to the surface of the fixed anchor rod, a first limiting pulley is fixedly installed on the surface of the support ring, a support rod is fixedly connected to the surface of the support ring, a connecting ring is fixedly connected to the surface of the support rod, and a second limiting pulley is fixedly installed on the surface of the connecting ring. This dewatering well structure utilizes a multi-stage reverse filtration structure near the dewatering well body, preventing sand and gravel particles from being lost with the water flow, effectively preventing piping, and protecting the safety and stability of the existing tunnel.
[0022] Furthermore, there are four sets of dewatering wells, which are evenly distributed around the existing tunnels and new foundation pits. The multiple sets of dewatering wells can evenly lower the groundwater level and improve the safety of dewatering.
[0023] Furthermore, the gravel, fine sand, and sponge are arranged in a tubular shape inside the dewatering well body, and the gravel, fine sand, and sponge are sequentially filled on the dewatering well body. The gravel, fine sand, and sponge form a multi-stage reverse filter structure on the dewatering well body, which can effectively prevent sand particles from being lost with the water flow. The outer wall of the permeable pipe is in contact with the surface of the sponge, and the bottom of the permeable pipe is lower than the groundwater level, which enables groundwater dewatering operations.
[0024] Furthermore, multiple sets of fixed anchor bolts are installed, and the fixed anchor bolts are evenly distributed at the bottom of the support ring. The fixed anchor bolts restrict the position of the dewatering well limiting component on the dewatering well body on the ground, thereby preventing the position of the dewatering well limiting component from shifting. When the dewatering well limiting component is installed on the ground at the top of the dewatering well body, the ground needs to be leveled to ensure that the dewatering well limiting component is parallel to the horizontal plane, so as to facilitate the limiting and guiding of the permeable pipe. The permeable pipe will use pumping equipment to dewater the groundwater.
[0025] Furthermore, the support ring supports the connecting ring through support rods. Multiple sets of support rods are provided and are evenly distributed between the support ring and the connecting ring. The support ring and the connecting ring are parallel to each other, and the centers of the support ring and the connecting ring are on the same horizontal line. The support rods are perpendicular to the horizontal plane.
[0026] Furthermore, four sets of first limiting pulleys are provided, and the four sets of first limiting pulleys are evenly distributed in the inner ring of the support ring. Four sets of second limiting pulleys are provided, and the four sets of second limiting pulleys are evenly distributed in the inner ring of the connecting ring. The horizontal height of the second limiting pulleys is higher than that of the first limiting pulleys. The first and second limiting pulleys simultaneously limit and guide the angle of the permeable pipe on the dewatering well body.
[0027] Furthermore, the permeable pipe passes through both the connecting ring and the support ring, and the permeable pipe is in contact with the surfaces of the first limiting pulley and the second limiting pulley. The first limiting pulley and the second limiting pulley ensure the vertical angle of the permeable pipe and make the permeable pipe in the central area of the dewatering well body. The rotation of the first limiting pulley and the second limiting pulley can also reduce the friction when the permeable pipe enters the dewatering well body.
[0028] Working principle: The dewatering well bodies are excavated on both sides of the existing tunnel. After excavation, a dewatering well limiting component is installed on top of the well body. First, the soil around the top of the well body needs to be leveled. Then, fixed anchor rods are inserted into the soil around the top of the well body to restrict the position of the limiting component. Support rings, support rods, and connecting rings support the first and second limiting pulleys on top of the well body. The first and second limiting pulleys guide the permeable pipe, ensuring that the permeable pipe is inserted into the bottom of the well body. Maintaining a vertical position, the dewatering well limiting component is then removed from the top of the dewatering well body. Gravel, fine sand, and sponge are then sequentially filled between the dewatering well body and the permeable pipe. During the process of dewatering groundwater through the permeable pipe on the dewatering well body, the multi-stage filter structure formed by the gravel, fine sand, and sponge prevents sand and gravel particles from being lost with the water flow, effectively preventing piping and protecting the safety and stability of the existing tunnel. The permeable pipe, vertically positioned inside the dewatering well body, ensures the uniformity of the filling of gravel, fine sand, and sponge between the dewatering well body and the permeable pipe, thus guaranteeing the effectiveness of the multi-stage filter structure.
Claims
1. A structure of a dewatering well for preventing loss of particles adjacent to an existing station, comprising an existing tunnel and a newly constructed foundation pit above the existing tunnel, characterized in that: The existing tunnel and the newly-built foundation pit are provided with a dewatering well body, a water-permeable pipe is arranged in the dewatering well body, gravel, fine sand and sponge are filled between the dewatering well body and the water-permeable pipe, a dewatering well limiting assembly is arranged on the top of the dewatering well body, the dewatering well limiting assembly comprises a fixed anchor rod, the fixed anchor rod is inserted into the ground on the periphery of the top of the dewatering well body, a support ring is fixedly connected to the surface of the fixed anchor rod, a first limiting pulley is fixedly installed on the surface of the support ring, a support rod is fixedly connected to the surface of the support ring, a connecting ring is fixedly connected to the surface of the support rod, and a second limiting pulley is fixedly installed on the surface of the connecting ring.
2. A stormwater pit structure for preventing loss of particulate adjacent an existing station according to claim 1, characterised in that: The dewatering well body is provided with four groups, and is uniformly distributed around the existing tunnel and the newly-built foundation pit.
3. A stormwater pit structure for preventing loss of particulates adjacent an existing station as claimed in claim 1, characterised in that: The gravel, fine sand and sponge are tubular in the dewatering well body, and are sequentially filled in the dewatering well body.
4. A stormwater pit structure for preventing loss of particulate adjacent an existing station according to claim 1, characterised in that: The fixed anchor rod is provided with multiple groups, and is uniformly distributed at the bottom of the support ring.
5. A stormwater pit structure for preventing loss of particulates adjacent an existing station as claimed in claim 1, characterised in that: The support ring supports the connecting ring through the support rod, and the support rod is provided with multiple groups, and is uniformly distributed between the support ring and the connecting ring.
6. A stormwater pit structure for preventing loss of particulate adjacent an existing station according to claim 1, characterised in that: The first limiting pulley is provided with four groups, and is uniformly distributed in the inner circle of the support ring, and the second limiting pulley is provided with four groups, and is uniformly distributed in the inner circle of the connecting ring.
7. A stormwater pit structure for preventing loss of particulate adjacent an existing station according to claim 6, characterised in that: The water-permeable pipe penetrates through the connecting ring and the support ring, and is connected to the surfaces of the first limiting pulley and the second limiting pulley.