CN210122728U - A drainage bed course and precipitation structure for foundation ditch - Google Patents
A drainage bed course and precipitation structure for foundation ditch Download PDFInfo
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- CN210122728U CN210122728U CN201920904097.7U CN201920904097U CN210122728U CN 210122728 U CN210122728 U CN 210122728U CN 201920904097 U CN201920904097 U CN 201920904097U CN 210122728 U CN210122728 U CN 210122728U
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Abstract
The utility model relates to a drainage bed course and precipitation structure for foundation ditch, including being used for laying at the first geotechnological separate layer of soil matrix, first geotechnological separate layer upper berth is equipped with the grit permeable bed, and the grit permeable bed upper berth is equipped with second geotechnological separate layer, and second geotechnological separate layer upper berth is equipped with the concrete surface course, the utility model discloses a drainage bed course and precipitation structure can solve vertical osmotic coefficient and be greater than the level and lead to the fact the problem of precipitation difficulty to osmotic coefficient and underlying confined aquifer's soil layer because the confined water holds in the palm the supply, guarantees the dry and comfortable environment in the foundation ditch.
Description
Technical Field
The utility model relates to a building engineering technical field, concretely relates to a drainage bed course and precipitation structure for foundation ditch.
Background
In engineering construction, a cushion layer is usually laid before the construction of a foundation slab, and the cushion layer plays roles of water resistance, water drainage and freeze prevention so as to improve the working conditions of a base layer and a soil foundation. In the engineering with the basement structure, a concrete cushion layer is laid after the basement design depth is dug, and then a coiled material waterproof layer is constructed on the cushion layer to prevent the basement from leaking. The inventor finds that in actual engineering construction, due to the fact that the pore directions in soil bodies are anisotropic, a cohesive soil stratum with a vertical permeability coefficient larger than a horizontal permeability coefficient exists, and if confined water is under the cohesive soil stratum, the confined water is often supported and supplied. Because the horizontal permeability coefficient of the stratum is smaller than the vertical permeability coefficient, a groundwater falling funnel cannot be formed in the stratum by adopting a conventional precipitation structure, and groundwater cannot be effectively evacuated, so that the underlying confined water reaches the inside of the foundation pit along the inner space of the soil body. Because the operation space in the foundation pit has the pressure-bearing water gushing, the dry and comfortable environment can not be achieved, the concrete cushion layer is not completely hardened, so that the coiled material waterproof layer can not be constructed, and great troubles are caused to engineering construction. Therefore, the development of a drainage cushion structure and a precipitation structure for a confined water vertical jacking replenishing stratum is urgently needed, so that the dry environment during foundation pit construction is ensured, and the engineering quality of subsequent processes such as a coiled material waterproof layer is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of above-mentioned prior art, provide a drainage bed course for foundation ditch, can effectively sparse receive the bearing effect top to hold in the palm the supply and the groundwater of upwelling, make follow-up operation have dry and comfortable operation environment, guarantee the engineering quality of follow-up processes such as coiled material waterproof layer.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a drainage bed course for foundation ditch, is including being used for laying the first geotechnological separate layer at the soil matrix, and first geotechnological separate layer upper berth is equipped with grit permeable bed, and grit permeable bed upper berth is equipped with second geotechnological separate layer, and second geotechnological separate layer upper berth is equipped with the concrete surface course.
Furthermore, the first geotechnical separation layer and the second geotechnical separation layer adopt non-woven geotechnical cloth or polypropylene geotechnical cloth.
Further, the specification of the non-woven geotextile or the polypropylene geotextile is 100g/m2-600g/m2。
Furthermore, the thickness of the sandstone permeable layer is 5cm-10cm, and the sandstone permeable layer is made of sandstone materials with the particle size of 5mm-20 mm.
Furthermore, the thickness of the concrete surface layer is 5cm-10cm, and the concrete is formed by pouring C15-C30 concrete.
The utility model provides a precipitation structure, is including seting up the foundation ditch at the soil matrix, the waterproof curtain has been inserted in the foundation ditch, the waterproof curtain is used for preventing the peripheral groundwater of foundation ditch through the level to the inflow foundation ditch, laid the foundation ditch bottom surface be used for the drainage bed course of foundation ditch, be provided with at least one precipitation well in the foundation ditch, the precipitation well stretches into the confined aquifer to the soil matrix below the foundation ditch basement.
Furthermore, the waterproof curtain is arranged close to the pit wall on the side part of the foundation pit.
The utility model has the advantages that:
1. the dewatering structure of the utility model can evacuate the groundwater after upwelling by the jacking supply to each dewatering well by laying the drainage cushion layer on the bottom surface of the foundation pit, can effectively solve the dewatering problem caused by the vertical jacking supply of the confined water in the stratum for the soil layer of which the vertical permeability coefficient of the base is greater than the horizontal permeability coefficient and the confined aquifer is under the ground, and ensures the dry and comfortable environment in the foundation pit; disturbance to foundation soil after the underground water gushes is avoided, and the strength of the foundation soil is ensured; can provide dry and comfortable operation environment for the operation space and ensure the construction quality of subsequent construction procedures such as a waterproof layer of the coiled material and the like.
2. The utility model discloses a drainage bed course through laying second geotechnological separating layer on the grit permeable bed, can keep apart grit permeable bed and earth, avoids earth and grit permeable bed to mix, guarantees the permeable effect on grit permeable bed, makes the groundwater that receives the bearing effect top support supply in time sparse, discharges away through precipitation well.
3. The utility model discloses a drainage bed course through set up first geotechnological separate layer between concrete surface course and grit permeable bed, and the cement thick liquid when preventing upper portion concreting is sneaked into the grit permeable bed influences the effect of permeating water.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of a drainage mat layer according to embodiment 1 of the present invention;
fig. 2 is a schematic view of the embodiment 3 of the present invention of a precipitation structure;
the water-retaining and water-retaining type water-retaining soil-working well comprises a drainage cushion layer 1, a first geotechnical separation layer 1-1, a sand-stone permeable layer 1-2, a second geotechnical separation layer 1-3, a concrete surface layer 1-4, a soil foundation 2, a vertical permeable layer 2-1, a confined aquifer 2-2, a foundation pit 3-1, a base 4, a water-retaining curtain 5 and a dewatering well 5.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "upper" and "lower" in the present invention shall only be used to indicate correspondence with the upper and lower directions of the drawings themselves, and shall not limit the structure, but merely to facilitate the description of the present invention and simplify the description, and shall not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and shall not be construed as limiting the present invention.
As described in the background art, the existing foundation pit often has the phenomenon of confined water jacking replenishment, and a conventional precipitation structure cannot form an underground water falling funnel in the stratum and effectively evacuate underground water, so that underlying confined water reaches the foundation pit along the inner space of the soil body. Because there is pressure-bearing water to gush in the operation space in the foundation ditch, can't reach dry and comfortable environment, to above-mentioned problem, this application has proposed a drainage bed course for foundation ditch.
Example 1 of an exemplary embodiment of the present application, as shown in fig. 1, a drainage blanket 1 for a foundation pit includes a first geotechnical separation layer 1-1 for being laid on a soil base 2 of a bottom surface of the foundation pit, the first geotechnical separation layer being 200g/m2Non-woven geotextile, first geotechnological separate layer upper berth is equipped with grit permeable bed 1-2, the grit permeable bed adopts the grit material of particle diameter 5mm-20mm, and thickness is 5cm, evenly lays on first geotechnological separate layer, and first geotechnological separate layer separates foundation soil and grit permeable bed, avoids earth and grit permeable bed to mix, guarantees the effect of permeating water of grit permeable bed, makes the groundwater of receiving the pressure-bearing effect top support supply in time sparse, discharges away through the precipitation well, grit permeable bed upper berth is equipped with by 200g/m2A second geotechnical separation layer 1-3 made of the non-woven geotextile, wherein a concrete surface layer 1-4 formed by pouring C30 concrete is laid on the second geotechnical separation layer, and the concrete surface layer is mixed with the concreteThe concrete surface course carries out flattening and maintenance, cement thick liquid when second geotechnological separate layer can prevent that upper portion concrete surface course concreting sneaks into grit permeable bed influences the effect of permeating water.
Example 2:
the embodiment discloses a construction method of a drainage cushion layer for a foundation pit, which comprises the following steps: after the foundation pit is excavated to the designed base elevation, if the phenomenon of top support replenishment under the bearing action of the underground water occurs and a dry and comfortable operation environment cannot be kept in the foundation pit, laying the first geotechnical separation layer firstly, laying the sandstone permeable layer again, separating the foundation soil and the sandstone permeable layer through the first geotechnical separation layer, avoiding the mixing of the soil and the sandstone permeable layer, ensuring the permeable effect of the sandstone permeable layer, evacuating the underground water replenished under the bearing action of the top support in time and draining away through a dewatering well; the second geotechnical separation layer is laid on the sandstone permeable layer, so that cement slurry is prevented from being mixed into the sandstone permeable layer when concrete is poured on the upper part, and the permeable effect is prevented from being influenced; and pouring a concrete surface layer on the second geotechnical separation layer, and leveling and maintaining.
Example 3:
the embodiment discloses a precipitation structure, which is applied to the condition that a cohesive soil vertical permeable layer 2-1 which contains vertical pores and has a vertical permeability coefficient of a soil body larger than a horizontal permeability coefficient due to the anisotropy of the pores exists under a foundation pit, and a confined aquifer 2-2 is under the cohesive soil vertical permeable layer.
As shown in fig. 2, precipitation structure is including seting up in the foundation ditch 3 of soil matrix, insert water-stop curtain 4 in the foundation ditch, the lateral part pit wall setting of tight foundation ditch of water-stop curtain subsides, in the vertical permeable bed below water-stop curtain bottom inserts basement 3-1, and is concrete, the vertical permeable bed near the basement is crossed to the water-stop curtain, inserts in the relative water-proof stratum of the vertical permeable bed or the cohesive soil of deeper layer, the water-stop curtain can block peripheral via the horizontal direction flow direction foundation ditch of foundation ditch, the bottom surface of foundation ditch laid groundwater the drainage bed course for the foundation ditch, be provided with at least one precipitation well 5 in the foundation ditch, the precipitation well bottom stretches into the confined aquifer below the basement, and is concrete, and the precipitation well bottom stretches into the confined aquifer nearest to the basement.
The underground water after being supplied and upwelled by the jacking is evacuated to each precipitation well under the dredging effect of the drainage cushion layer, so that the dry environment in the foundation pit is ensured.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (7)
1. The utility model provides a drainage bed course for foundation ditch, its characterized in that, is including being used for laying the first geotechnological separate layer at the soil matrix, first geotechnological separate layer upper berth is equipped with grit permeable bed, and grit permeable bed upper berth is equipped with second geotechnological separate layer, and second geotechnological separate layer upper berth is equipped with the concrete surface course.
2. A drainage mat for foundation pits as claimed in claim 1, wherein the first and second geo-spacer layers are non-woven geotextile or polypropylene geotextile.
3. A drainage mat for foundation pits as claimed in claim 2, wherein the non-woven geotextile or polypropylene geotextile has a size of 100g/m2-600g/m2。
4. A drainage mat for foundation pits as claimed in claim 1, wherein the sand permeable layer has a thickness of 5cm to 10cm and is formed of sand material having a particle size of 5mm to 20 mm.
5. A drainage blanket for a foundation pit as claimed in claim 1 wherein said concrete cover is 5cm to 10cm thick and cast of C15 to C30 concrete.
6. A dewatering structure is characterized by comprising a foundation pit arranged on a soil foundation, wherein a waterproof curtain is inserted into the foundation pit and used for preventing underground water around the foundation pit from horizontally flowing into the foundation pit, the bottom surface of the foundation pit is paved with the drainage cushion layer for the foundation pit according to any one of claims 1-5, at least one dewatering well is arranged in the foundation pit, and the dewatering well extends into a confined aquifer of the soil foundation below the foundation pit base.
7. The precipitation structure of claim 6, wherein said waterproof curtain is disposed against the pit wall at the side of the foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920904097.7U CN210122728U (en) | 2019-06-14 | 2019-06-14 | A drainage bed course and precipitation structure for foundation ditch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920904097.7U CN210122728U (en) | 2019-06-14 | 2019-06-14 | A drainage bed course and precipitation structure for foundation ditch |
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| Publication Number | Publication Date |
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| CN210122728U true CN210122728U (en) | 2020-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920904097.7U Active CN210122728U (en) | 2019-06-14 | 2019-06-14 | A drainage bed course and precipitation structure for foundation ditch |
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| CN (1) | CN210122728U (en) |
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- 2019-06-14 CN CN201920904097.7U patent/CN210122728U/en active Active
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