Arrangement structure for dewatering and drainage of foundation pit near river
By setting up a water trench on the outer edge of the foundation pit and a precipitation well with a depth exceeding the foundation pit, combined with the design of a submersible pump and overflow sand sink tank, the problem of low precipitation efficiency caused by the rise of the river water level during the construction of the river foundation pit is solved, and the effect of efficient drainage and protection facilities is achieved.
Patent Information
- Application Number
- CN202422432365.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-09
AI Technical Summary
During the construction of the foundation pit in Linhe, the rapid rise in the water level of the river channel leads to low precipitation efficiency of the foundation pit, affecting the construction environment and progress, and may lead to water accumulation in the foundation pit, damaging the facilities and equipment and slowing down the construction progress.
Two sections of interceptor ditches and multiple precipitation wells are set up on the outer edge of the foundation pit. The depth of the precipitation well exceeds the depth of the foundation pit. It is equipped with a submersible pump and the interceptor ditch is connected through the pipeline. The submersible pump is used to directly discharge water into the river channel. At the same time, an overflow sand sink tank is set up in the interceptor ditch to separate the sand particles to reduce damage to the drainage pipes.
Effectively block the seepage of river channels into the foundation pit, improve precipitation efficiency, prevent water accumulation in the foundation pit, protect facilities and equipment, ensure construction progress, and separate sand particles through overflow sand sedimentation tanks to reduce damage to drainage pipelines.
Smart Images
Figure CN223135169U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of foundation pit construction design, and particularly relates to an arrangement structure for precipitation and drainage of a foundation pit near a river. Background Art
[0002] During the foundation pit excavation process, if the groundwater level is higher than the excavation bottom surface, groundwater will continuously seep into the pit. Especially for the foundation pit construction project near a river, in case of continuous heavy rainfall, the groundwater level of the river and its surrounding area will rise. Under the geological conditions of strong permeability, groundwater will seep into the foundation pit, affecting the construction environment and progress. For the slope excavation project of the foundation pit at a lower altitude, there will also be a situation where surface water flows into the foundation pit. If the accumulated water in the foundation pit is not drained in time, it will seriously affect the geological conditions of this area and may cause uneven settlement of the surrounding buildings. At the same time, a large amount of accumulated water in the foundation pit will damage the facilities and equipment in the foundation pit and slow down the construction progress, resulting in material and time losses. Content of the Utility Model
[0003] The utility model provides an arrangement structure for precipitation and drainage of a foundation pit near a river, which solves the problem in the prior art that the precipitation efficiency of the foundation pit is not high in the face of the rapid rise of the river water level.
[0004] The utility model is realized through the following technical solutions:
[0005] An arrangement structure for precipitation and drainage of a foundation pit near a river, comprising:
[0006] A foundation pit, which is arranged near the river;
[0007] A catch ditch, which has two sections. The catch ditch is respectively arranged along the outer edge of the foundation pit, one end is connected to the river, and the other end winds around to the middle of the side of the foundation pit far from the river;
[0008] A plurality of precipitation wells, which are arranged along the outer edge of the foundation pit. Except for the precipitation wells on the side of the foundation pit near the river, the rest of the precipitation wells are arranged between the foundation pit and the catch ditch and are connected to the catch ditch through pipelines;
[0009] Wherein, the depth of the precipitation well is greater than the depth of the foundation pit, and a submersible pump for drainage is arranged in the precipitation well.
[0010] Furthermore, the precipitation well includes a protection pipe wall. A plurality of non-sand pipes are installed in the protection pipe wall as well pipes. The non-sand pipes are vertically arranged end to end. Permeable holes are uniformly arranged on the pipe wall of the non-sand pipes. The lower end of the non-sand pipe is closed and the upper end is higher than the ground. An iron cover plate is arranged at the pipe orifice. Filter material is filled between the protection pipe wall and the non-sand pipe.
[0011] Further, the filter material is gravel with a size of 8 - 10 mm. When the filter material is filled to 1 - 4 m below the wellhead of the sandless pipe, it is filled and tamped solid with cohesive soil.
[0012] Further, the dewatering wells located between the intercepting ditch and the foundation pit are grouped in even numbers and are respectively connected to the intercepting ditch through pipes. The pipes include branch pipes and a main pipe. One end of the branch pipe is connected to the water outlet of the submersible pump, and the other end is connected to the main pipe. The water outlet of the main pipe is connected and higher than the intercepting ditch. The branch pipes are symmetrically arranged with the main pipe as the center.
[0013] Further, an overflow and sedimentation tank is provided at the end of the intercepting ditch close to the river. Starting from the overflow and sedimentation tank, a sedimentation tank is set every 40 - 60 m along the length direction of the intercepting ditch.
[0014] Further, the intercepting ditch is provided with a concrete - poured cushion layer, the side wall is built with bricks and plastered with cement mortar on the water - facing side, and the slope is 0.3%.
[0015] Compared with the prior art, the present utility model has the following advantages:
[0016] First, several dewatering wells are set between the river and the foundation pit, and their depth exceeds that of the foundation pit. It can timely block the seepage of water from the river to the foundation pit by pumping and draining water. And because they are set near the river, the submersible pump can directly discharge the water into the river.
[0017] Second, every four dewatering wells are connected in series by branch pipes, and then the main pipe is set at the center line of the branch pipes. The branch pipes are symmetrically distributed along the main pipe. This symmetrical structure can dissipate energy in the form of counter - impact when water enters the port of the main pipe, reducing the damage to the drainage pipes.
[0018] Third, the intercepting ditch set between the foundation pit and the dewatering wells can intercept part of the surface water from entering the foundation pit, and at the same time can be used for the discharge of the dewatering wells. The water passes through the sedimentation tank from the intercepting ditch, separating most of the sand grains in the water, and finally is discharged into the river through the overflow and sedimentation tank, solving the problem of pumping and discharging water from the dewatering wells. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:
[0020] Figure 1 is a schematic diagram of the partial structure of the present utility model.
[0021] Figure 2 is a schematic top - view of the main structure of the present utility model.
[0022] Figure 3 isFigure 1 Enlarged view of the medium precipitation well structure.
[0023] Figure 4 Schematic diagram of the transverse cross-section structure of the intercepting ditch. Specific implementation manner
[0024] The preferred embodiments of the present utility model will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.
[0025] As Figures 1-4 shown, a layout structure for precipitation and drainage of a foundation pit near a river includes
[0026] a foundation pit 10, the foundation pit 10 is arranged near the river; an intercepting ditch 20, the intercepting ditch 20 has two sections, the intercepting ditch 20 is respectively arranged along the outer edge of the foundation pit 10, one end is connected to the river channel, and the other end winds around to the middle of the side of the foundation pit 10 away from the river channel; a plurality of precipitation wells 30, the precipitation wells 30 are arranged along the outer edge of the foundation pit 10, except for the precipitation wells 30 on the side of the foundation pit near the river, the remaining precipitation wells 30 are arranged inside the intercepting ditch 20 and are connected to the intercepting ditch 20 through a pipeline 40;
[0027] wherein, the depth of the precipitation well 30 is greater than the depth of the foundation pit 10, and a submersible pump 50 for drainage is arranged in the precipitation well 30.
[0028] Further, the precipitation well 30 includes a protective pipe wall 303, and a plurality of non-sand pipes 301 are installed inside the protective pipe wall 303 as well pipes. The non-sand pipes 301 are connected end to end and arranged vertically. The pipe walls of the non-sand pipes 301 are uniformly provided with water permeable holes. The lower end of the non-sand pipe 301 is closed and the upper end is set higher than the ground. An iron cover plate 304 is arranged at the pipe orifice, and a filter material 302 is filled between the protective pipe wall 303 and the non-sand pipe 301.
[0029] Further, the filter material 302 is 8-10 mm broken stones. When the filter material 302 is filled to 1-4 m below the wellhead of the non-sand pipe 301, cohesive soil 305 is used to fill and tamp it flat.
[0030] Further, the precipitation wells 30 located between the intercepting ditch 20 and the foundation pit 10 are grouped in even numbers and are respectively connected to the intercepting ditch 20 through a pipeline 40. The pipeline 40 includes a branch pipe 401 and a main pipe 402. One end of the branch pipe 401 is connected to the water outlet of the submersible pump 50, and the other end is connected to the main pipe 402. The water outlet of the main pipe 402 is connected and set higher than the intercepting ditch 20. The branch pipes 401 are symmetrically arranged with the main pipe 402 as the center.
[0031] Furthermore, an overflow grit chamber 201 is provided at the end of the intercepting ditch 20 close to the river channel, and a grit chamber 202 is provided every 40 to 60 m along the length direction of the intercepting ditch 20 with the overflow grit chamber 201 as the starting point.
[0032] Furthermore, the intercepting ditch 20 has a concrete cast cushion layer 203, a side wall built with bricks 204 and a cement mortar 205 applied to the water surface, with a slope of 0.3%.
[0033] During the specific construction, the wall protection pipe 303 is first buried manually. After the wall protection pipe 303 is installed, drilling begins. The drilling wall is protected by mud. After the drilling is completed, the hole is cleaned. After the hole is cleaned, the sandless pipe 301 is hoisted. Each section of the sandless pipe 301 should be concentric and tightly connected. When hoisting, the center position and verticality of the sandless pipe 301 are adjusted. The lower end is closed, the well pipe is higher than the ground, and an iron cover plate 304 is set at the pipe mouth. Filter material 302 is evenly placed between the sandless pipe 301 and the wall protection pipe 303. The filter material 302 is 8-10mm gravel. When the filter material 302 is filled to about 1m below the wellhead, it is filled and tamped with clay 305. The hole should be cleaned again to dilute the mud before the filter material 302 is placed.
[0034] At the same time, the bottom of the intercepting ditch 20 is cast with C15 plain concrete. Before pouring the concrete, the elevation is controlled and a cushion layer 203 is set. The side walls of the intercepting ditch 20 are built with bricks 204 and the side walls are plastered with cement mortar 205. The slope of the intercepting ditch is 0.3%. After the concrete is poured, it is maintained in time to prevent cracks.
[0035] Among them, the submersible pump 50 in the well is connected to the drainage branch pipe 401 (steel pipe). At the wellhead, the ground drainage main pipe 402 is connected to the drainage branch pipe 401. The main pipe 402 adopts PE pipe and is arranged along the periphery of the foundation pit. Every four precipitation wells 20 use one main pipe 402 for drainage. The water in the precipitation well 20 is pumped out by the submersible pump 50 and drawn into the main pipe 402 from the branch pipe 401, and then discharged to the intercepting ditch 20 through the main pipe 402, and precipitated through the grit chamber 202 and the overflow grit chamber 201, and discharged into the river after qualified precipitation.
[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. An arrangement structure for dewatering and drainage of a foundation pit adjacent to a river, characterized in that including, a foundation pit (10), the foundation pit (10) is arranged adjacent to a river; a catch ditch (20), there are two sections of the catch ditch (20), the catch ditch (20) is respectively arranged along the outer edge of the foundation pit (10), one end is connected to the river channel, and the other end winds around to the middle of the side of the foundation pit (10) away from the river channel; a plurality of dewatering wells (30), the dewatering wells (30) are arranged along the outer edge of the foundation pit (10), except for the dewatering wells (30) on the riverside side of the foundation pit, the rest of the dewatering wells (30) are arranged between the foundation pit (10) and the catch ditch (20) and are connected to the catch ditch (20) through a pipeline (40); wherein, the depth of the dewatering well (30) is greater than the depth of the foundation pit (10), and a submersible pump (50) for drainage is arranged in the dewatering well (30).
2. The layout structure for precipitation and drainage of a foundation pit near a river according to claim 1, characterized in that, The dewatering well (30) includes a protection pipe wall (303), and a plurality of non-sand pipes (301) are installed in the protection pipe wall (303) as well pipes. The non-sand pipes (301) are vertically arranged end to end, and water permeable holes are uniformly arranged on the pipe walls of the non-sand pipes (301). The lower end of the lowermost section of the non-sand pipe (301) is closed, the upper end of the uppermost section of the non-sand pipe (301) is arranged above the ground, and an iron cover plate (304) is arranged at the pipe orifice. A filter material (302) is filled between the protection pipe wall (303) and the non-sand pipe (301).
3. The layout structure of a river-side foundation pit dewatering and drainage according to claim 2, characterized in that, The filter material (302) is 8 - 10 mm gravel. When the filter material (302) is filled to 1 - 4 m below the well orifice of the non-sand pipe (301), cohesive soil (305) is used to fill and tamp it flat.
4. The layout structure for dewatering and drainage of a foundation pit near a river according to claim 1, characterized in that, The dewatering wells (30) located between the catch ditch (20) and the foundation pit (10) are grouped in an even number and are respectively connected to the catch ditch (20) through a pipeline (40). The pipeline (40) includes a branch pipe (401) and a main pipe (402). One end of the branch pipe (401) is connected to the water outlet of the submersible pump (50), and the other end is connected to the main pipe (402). The water outlet at the position of the main pipe (402) is connected and is higher than the catch ditch (20). The branch pipes (401) are symmetrically arranged with the main pipe (402) as the center.
5. The layout structure of a river-side foundation pit dewatering and drainage according to claim 1, characterized in that, An overflow grit chamber (201) is arranged at the end of the catch ditch (20) close to the river channel. Starting from the overflow grit chamber (201), a grit chamber (202) is arranged every 40 - 60 m along the length direction of the catch ditch (4).
6. The arrangement structure for dewatering a riverside foundation pit according to claim 1 or 4, characterized in that: The catch ditch (20) is provided with a concrete casting cushion layer (203), the side wall is built with bricks (204) and plastered with cement mortar (205) on the water-facing surface, and the slope is 0.3%.