CN215977295U - Foundation pit supporting structure - Google Patents
Foundation pit supporting structure Download PDFInfo
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- CN215977295U CN215977295U CN202122190849.8U CN202122190849U CN215977295U CN 215977295 U CN215977295 U CN 215977295U CN 202122190849 U CN202122190849 U CN 202122190849U CN 215977295 U CN215977295 U CN 215977295U
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Abstract
The utility model discloses a foundation pit supporting structure, which comprises: one side of the steel sheet pile is a foundation pit excavation area; the cast-in-place pile is positioned on one side, away from the foundation pit excavation area, of the steel sheet pile; the beam is arranged on one side, facing the foundation pit excavation area, of the steel sheet pile, and an anchor head is arranged on the beam; the prestressed anchor cable corresponds to the cross beam, one end of the prestressed anchor cable is fixedly arranged in the cast-in-place pile, the other end of the prestressed anchor cable sequentially penetrates through the steel sheet pile and the cross beam and then is fixed through the anchor head, and the soil trough is an area formed by enclosing the steel sheet pile and the cast-in-place pile. The foundation pit supporting structure provided by the embodiment of the utility model shortens the construction process and the construction period, improves the lateral stiffness, can be applied to projects with deeper depth, higher underground water level and more complex surrounding environment, can recycle steel sheet piles, beams, cast-in-place piles and prestressed anchor cables after the construction is finished, greatly reduces the engineering cost, and meets the requirement of green and environment-friendly construction.
Description
Technical Field
The utility model relates to the technical field of foundation pit supporting, in particular to a foundation pit supporting structure.
Background
In the foundation pit engineering construction activity, because of large urban population density, complex surrounding environment and high land utilization degree, the foundation pit construction process generally cannot adopt a slope-releasing excavation mode. Generally speaking, the silt layer, the clay layer and the artificial soil layer form the surrounding geological environment of the foundation pit engineering, and the loose soil layers have extremely poor self-stability and are easy to collapse in the process of excavation of the foundation pit. When the underground water level is high, the phenomenon of sand flowing or piping is easily caused under the influence of water pressure, and the instability damage of the foundation pit is further aggravated. Therefore, in order to ensure the safety and convenience of the construction of the underground structure and the surrounding environment of the foundation pit, various foundation pit supporting means are required to ensure the safety of the construction of the underground structure and the surrounding structures.
The existing foundation pit supporting structure mainly has the following types: underground continuous walls, cast-in-place piles, SMW construction methods, cement-soil gravity type retaining walls, steel sheet piles and the like, and in addition, a mode of combining the supporting structure with a prestressed anchor cable for supporting also exists in the prior art.
The supporting modes of the underground continuous wall, the cast-in-place pile, the SMW construction method, the cement-soil gravity retaining wall and the like have the advantages of complex construction procedures, long construction period and high construction cost, but the side stiffness resistance is high, the resistance is good, and the method is generally only suitable for deep foundation pits and foundation pits with complex geological conditions and surrounding environments.
The steel sheet pile has the advantages of high bearing capacity, easy pile length adjustment, small soil discharge amount, simple joint, simple process, short construction period, low cost and the like, and is widely applied at home and abroad, but the steel sheet pile has poor lateral stiffness. When the foundation pit is deep or the underground water is buried deeply, the problem of lateral deformation of the steel sheet pile is very obvious. In order to solve the problem, the support in the form of a steel sheet pile is improved mainly from the following aspects in the prior art: 1. through improving the shape of the steel sheet pile, such AS linear type, L type, S type, U type, Z type, AS type, H type and other various forms of steel sheet piles, although the steel sheet pile of the above form increases the lateral stiffness to a certain extent, the construction difficulty is correspondingly improved; 2. the steel sheet piles, the H-shaped steel and the I-shaped steel are constructed in a combined mode, the transverse supports and the lateral supports are arranged among the steel sheet piles to enhance the lateral stiffness of the steel sheet piles, but the lateral stiffness is given once after the construction is completed, when the excavation meets an emergency and the lateral stiffness of the steel sheet piles needs to be improved step by step, the construction is difficult to achieve, and the construction process is more difficult.
The existing construction process of combining a supporting structure and a prestressed anchor cable for supporting is basically as follows: constructing a supporting structure, excavating a layer of earthwork, forming a hole by anchor holes, placing anchor cables, forming anchoring ends by grouting, enabling an anchoring body to reach certain strength (reaching the design strength of 75-80% and requiring more than 10 days), tensioning prestressed anchor cables, excavating the next layer of earthwork, forming a hole by the next anchor hole, repeating the construction by the same method until the construction of each anchor cable is finished, and finishing the excavation of a foundation pit, so that the problems of complex process and long construction period exist; in addition, the mode of combining the supporting structure with the prestressed anchor cable for supporting still has following problem: 1. due to the particularity of the construction of the prestressed anchor cable, the anchoring end of the prestressed anchor cable needs to be fixed on a specific soil (rock) layer (specific foundation strength), in foundation pit engineering, the surrounding geological environment is usually a loose soil layer and is difficult to meet the soil (rock) layer with better conditions, in order to meet the soil (rock) layer meeting the anchoring requirement in the construction process, the length of the anchor cable is overlong, the hole forming difficulty (easy hole collapse) is increased, the lowering difficulty of the anchor cable is increased, and the cost is increased; 2. in traditional prestressed anchorage cable construction, a grouting anchoring form is often adopted, the anchoring force provided by an anchoring body is small, and further the supporting capacity provided in the foundation pit excavation process is very limited.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a foundation pit supporting structure, wherein a steel plate pile is combined with a prestressed anchor cable, and a cast-in-place pile forms anchoring ends of a plurality of anchor cables, so that the construction process and the construction period are shortened, the lateral stiffness resistance of the steel plate pile is improved, the steel plate pile can be applied to projects with deeper depth, higher underground water level and more complex surrounding environment, the steel plate pile, a cross beam, the concrete cast-in-place pile and the prestressed anchor cable can be recycled after the construction is finished, the construction waste and the environmental pollution are reduced, the engineering cost is greatly reduced, and the green and environment-friendly construction requirements are met.
The purpose of the utility model is realized by the following technical scheme: a foundation pit supporting structure comprising:
one side of the steel sheet pile is a foundation pit excavation area;
the cast-in-place pile is positioned on one side, away from the foundation pit excavation area, of the steel sheet pile;
the beam is arranged on one side, facing the foundation pit excavation area, of the steel sheet pile, and an anchor head is arranged on the beam;
the prestressed anchor cable corresponds to the cross beam, one end of the prestressed anchor cable is fixedly arranged in the cast-in-place pile, and the other end of the prestressed anchor cable sequentially penetrates through the steel sheet pile and the cross beam and then is fixed through the anchor head
And the soil groove is an area formed by enclosing the steel sheet pile and the cast-in-place pile.
In an embodiment of the present invention, the cast-in-place pile is a concrete cast-in-place pile or a reinforced concrete cast-in-place pile.
In an embodiment of the present invention, a section steel is disposed in the cast-in-place pile, and one end of the prestressed anchor cable is fixedly connected to the section steel.
In an embodiment of the present invention, the prestressed anchor cable includes an anchor bundle and an anchor root, one end of the anchor root is fixedly connected to the profile steel, the other end of the anchor root is connected to one end of the anchor bundle, and the other end of the anchor bundle passes through the steel sheet pile and the cross beam in sequence and then is fixed by the anchor head.
In an embodiment of the utility model, the anchor bundle is obliquely arranged between the cast-in-place pile and the steel sheet pile.
In one embodiment of the present invention, the inclination angle of the anchor bundle is 0 ° to 30 °.
In one embodiment of the present invention, the section steel is any one of a channel steel, an i-steel, an H-steel, and an angle steel.
In an embodiment of the present invention, the steel sheet pile is any one of a linear steel sheet pile, an L-shaped steel sheet pile, an S-shaped steel sheet pile, a U-shaped steel sheet pile, a Z-shaped steel sheet pile, an AS-shaped steel sheet pile, and an H-shaped steel sheet pile.
In an embodiment of the present invention, the beam is any one of a steel-structure beam, a wood-structure beam, and a reinforced concrete beam.
In an embodiment of the present invention, N beams are sequentially arranged along a height direction of the steel sheet pile, where N is an integer greater than or equal to 1.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects:
1. according to the foundation pit supporting structure provided by the embodiment of the utility model, the steel sheet pile is combined with the prestressed anchor cable, and the cast-in-place pile forms the anchoring ends of a plurality of anchor cables, so that the construction process and the construction period are shortened, the lateral stiffness resistance of the steel sheet pile is improved, the steel sheet pile can be applied to projects with deeper depth, higher underground water level and more complex surrounding environment, the steel sheet pile, the cross beam, the concrete cast-in-place pile and the prestressed anchor cable can be recycled after the construction is finished, the construction waste and the environmental pollution are reduced, the engineering cost is greatly reduced, and meanwhile, the green and environment-friendly construction requirements are met.
2. The foundation pit supporting structure provided by the embodiment of the utility model avoids the construction processes of the existing prestressed anchor cable anchoring bodies of reaching certain strength, tensioning, excavating, the next row of anchoring bodies of reaching certain strength, tensioning and excavating and the like.
3. The foundation pit supporting structure provided by the embodiment of the utility model avoids the problem that the prestressed anchor cable is too long to reach the soil (rock) layer meeting the anchoring requirement when the soil quality around the foundation pit engineering is soft in the prior art, reduces the hole forming difficulty and the lowering difficulty of the prestressed anchor cable, reduces the influence of the prestressed anchor cable on surrounding overground buildings (structures) and underground pipelines, and can greatly save the cost.
4. In the foundation pit supporting structure provided by the embodiment of the utility model, the anchor root is arranged in the cast-in-place pile, so that a larger anchoring force is provided; the anchor root and the profile steel are poured and fixed in the cast-in-place pile, which is equivalent to the formation of the profile steel concrete cast-in-place pile, so that the bending strength of the cast-in-place pile is improved, and the restraint capability of the steel sheet pile is also greatly improved.
5. When the foundation pit supporting structure provided by the embodiment of the utility model is used, the construction of the anchor root is very simple and the anchor root can be anchored or welded with the profile steel, so that the construction concealment is avoided, the construction difficulty is reduced, and the construction quality is improved.
6. When the foundation pit supporting structure provided by the embodiment of the utility model is used specifically, anchor bundles can be tensioned in batches according to the excavation depth, and meanwhile, the tensioning force can be adjusted according to the magnitude of the restraining force required by the steel sheet pile on site, so that the working elasticity is large.
Drawings
Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic front view of a system of a foundation pit supporting structure according to an embodiment of the present invention;
fig. 2 is a schematic side view of a system of a foundation pit supporting structure according to an embodiment of the present invention;
fig. 3 is a schematic top view of a system for supporting a foundation pit according to an embodiment of the present invention;
the correspondence between each mark and the part name is as follows:
the steel sheet pile comprises a steel sheet pile 1, a cross beam 2, a cast-in-place pile 3, an anchor bundle 4, an anchor root 5, an anchor head 6, a soil tank 7 and section steel 8.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the utility model. All falling within the scope of the present invention.
Examples
Referring to fig. 1 to 3, the present embodiment provides an excavation supporting structure, including:
one side of the steel sheet pile 1 is a foundation pit excavation area;
the cast-in-place pile 3 is positioned on one side, away from the foundation pit excavation area, of the steel sheet pile 1;
the beam 2 is arranged on one side, facing the foundation pit excavation area, of the steel sheet pile 1, and an anchor head 6 is arranged on the beam 2;
the prestressed anchor cable 4 corresponds to the cross beam 2, one end of the prestressed anchor cable 4 is fixedly arranged in the cast-in-place pile 3, and the other end of the prestressed anchor cable 4 sequentially penetrates through the steel sheet pile 1 and the cross beam 2 and then is fixed through the anchor head 6;
and the soil tank 7 is an area enclosed between the steel sheet pile 1 and the cast-in-place pile 3.
Specifically, cast-in-place pile 3 in the present embodiment is concrete cast-in-place pile 3 or reinforced concrete cast-in-place pile 3.
Specifically, in the embodiment, the cast-in-place pile 3 is provided with the section steel 8, and one end of the prestressed anchor cable 4 is fixedly connected with the section steel 8.
Specifically, the prestressed anchor cable 4 in this embodiment includes an anchor bundle 4 and an anchor root 5, one end of the anchor root 5 is fixedly connected to the profile steel 8, the other end of the anchor root 5 is connected to one end of the anchor bundle, and the other end of the anchor bundle 4 is fixed by an anchor head 6 after sequentially passing through the steel sheet pile 1 and the cross beam 2. Wherein the anchor root 5 is connected with the section steel 8 in an anchoring or welding way.
The prestressed anchor cables 4 in this embodiment correspond to the cross beam 2, that is, the prestressed anchor cables 4 in the same row in the horizontal direction correspond to one cross beam, that is, the other ends of the anchor bundles on the prestressed anchor cables 4 in the same row in the horizontal direction are fixed to one cross beam by the anchor heads 6.
Wherein, the anchor beam 4 in this embodiment is obliquely arranged between the concrete cast-in-place pile 3 and the steel sheet pile 1.
Wherein the inclination angle alpha of the anchor beam 4 is 0-30 degrees. Alpha is the angle between the horizontal lines in the illustration of the anchor bundle 4 and the angle between the anchor bundle 4 and the horizontal plane in the soil trough 7.
The section steel 8 in this embodiment is any one of channel steel, i-steel, H-section steel, and angle steel.
In this embodiment, the steel sheet pile 1 is any one of a linear steel sheet pile, an L-shaped steel sheet pile, an S-shaped steel sheet pile, a U-shaped steel sheet pile, a Z-shaped steel sheet pile, an AS-shaped steel sheet pile, and an H-shaped steel sheet pile.
The beam 2 in this embodiment is any one of a steel structure beam, a wood structure beam, and a reinforced concrete beam.
Wherein, the crossbeam 2 in this embodiment has set gradually N along steel sheet pile 1 direction of height, and N is the integer that is more than or equal to 1, is provided with N prestressed anchorage cable 4 between every bored concrete pile 3 and steel sheet pile 1, and N prestressed anchorage cable 4 sets gradually along steel sheet pile 1 direction of height, and respectively with N crossbeam 2 corresponding, and then realizes the installation of N prestressed anchorage cable 4. The steel sheet pile 1 is provided with a plurality of rows of reserved holes from top to bottom, so that the anchor bundles 4 can conveniently penetrate in and out.
The concrete construction process of the foundation pit supporting structure in the embodiment is as follows:
forming a pile hole of the cast-in-place pile 3 in a rotary drilling or drilling mode; when the soil layer is soft and easy to collapse, a steel sleeve is adopted for supporting, and the hole depth and the hole diameter of the pile hole are determined according to the supporting requirements of the foundation pit;
constructing a steel sheet pile 1, wherein the construction depth of the steel sheet pile 1 is determined according to the supporting requirement of a foundation pit;
a soil groove 7 is formed between the pile hole and the steel sheet pile 1; the width of the soil groove 7 is larger than that of the anchor beam 4, so that the subsequent anchor beam 4 can be conveniently put in;
placing the anchor bundle 4 and the anchor root 5 (the prestressed anchor cable 4) into a pile hole and pouring concrete; the steel section 8 is arranged in the pile hole, the anchor root 5 is fixed on the steel section 8 in the pile hole in an anchoring or welding mode, the steel section 8 is used as the steel rib of the cast-in-place pile 3, the lateral stiffness of the cast-in-place pile 3 is increased, and in addition, if a steel sleeve support is used in the pile hole opening process, the steel sleeve is removed during initial setting of concrete and is recycled;
in the foundation pit engineering construction, when a preformed hole on a steel sheet pile 11 is dug, the anchor head 6 is utilized to stretch the anchor bundle 4 corresponding to the beam 2, the stretching degree is selected according to the actual engineering requirement, the excavation depth is further increased, the next row of anchor heads 6 is stretched, and the like;
backfilling the soil tank 7 after excavation of the foundation pit engineering is finished;
after the foundation pit engineering is completed and earthwork backfilling is carried out, the steel sheet pile 1, the cross beam 2, the concrete cast-in-place pile 3 and the prestressed anchor cable 4 are pulled out for recycling, and the cost is solved.
In addition, the following problems need to be noted when the foundation pit supporting structure in the embodiment is specifically constructed and used:
1. when a soil groove 7 is formed between the steel sheet pile 1 and the cast-in-place pile 3, in order to prevent soil from collapsing into the bottom when the soil groove 7 is formed and affecting construction, temporary fixing measures which are easy to disassemble can be adopted to prevent soil on two sides from collapsing, and the temporary fixing devices are disassembled after the anchor bundles 4 are placed; in addition, in order to save the cost of the soil forming groove 7, the maximum depth of the soil forming groove 7 should not exceed the position of the hole reserved in the lowest row of the steel sheet piles 1.
2. After the concrete cast-in-place pile 3 is poured, foundation pit earthwork excavation is carried out after the concrete reaches a certain strength, and the anchor bundle 4 is tensioned.
3. Along with the excavation work, the anchor beam 4 is timely tensioned according to the earthwork layered excavation progress, and the lateral resistance of the steel sheet pile 1 is improved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the utility model. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A foundation pit supporting structure, comprising:
one side of the steel sheet pile is a foundation pit excavation area;
the cast-in-place pile is positioned on one side, away from the foundation pit excavation area, of the steel sheet pile;
the beam is arranged on one side, facing the foundation pit excavation area, of the steel sheet pile, and an anchor head is arranged on the beam;
the prestressed anchor cable corresponds to the cross beam, one end of the prestressed anchor cable is fixedly arranged in the cast-in-place pile, and the other end of the prestressed anchor cable sequentially penetrates through the steel sheet pile and the cross beam and then is fixed through the anchor head;
and the soil groove is an area formed by enclosing the steel sheet pile and the cast-in-place pile.
2. The foundation pit supporting structure according to claim 1, wherein the cast-in-place pile is a concrete cast-in-place pile or a reinforced concrete cast-in-place pile.
3. The foundation pit supporting structure according to claim 1, wherein a section steel is provided in the cast-in-place pile, and one end of the prestressed anchor cable is fixedly connected with the section steel.
4. The foundation pit supporting structure according to claim 3, wherein the prestressed anchor cable comprises an anchor bundle and an anchor root, one end of the anchor root is fixedly connected with the section steel, the other end of the anchor root is connected with one end of the anchor bundle, and the other end of the anchor bundle passes through the steel sheet pile and the cross beam in sequence and then is fixed by the anchor head.
5. The foundation pit supporting structure according to claim 4, wherein the anchor bundle is obliquely disposed between the cast-in-place pile and the steel sheet pile.
6. The foundation pit supporting structure according to claim 5, wherein the inclination angle of the anchor bundle is 0 ° to 30 °.
7. The foundation pit supporting structure according to claim 3, wherein the section steel is any one of channel steel, I-steel, H-steel, and angle steel.
8. The foundation pit supporting structure according to claim 1, wherein the steel sheet pile is any one of a linear steel sheet pile, an L-shaped steel sheet pile, an S-shaped steel sheet pile, a U-shaped steel sheet pile, a Z-shaped steel sheet pile, an AS-shaped steel sheet pile, and an H-shaped steel sheet pile.
9. The foundation pit supporting structure according to claim 1, wherein the cross beam is any one of a steel structure cross beam, a wood structure cross beam, and a reinforced concrete cross beam.
10. The foundation pit supporting structure according to claim 1, wherein the number of the cross beams is N in sequence along the height direction of the steel sheet pile, and N is an integer of 1 or more.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122190849.8U CN215977295U (en) | 2021-09-10 | 2021-09-10 | Foundation pit supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122190849.8U CN215977295U (en) | 2021-09-10 | 2021-09-10 | Foundation pit supporting structure |
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| CN215977295U true CN215977295U (en) | 2022-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960675A (en) * | 2022-06-15 | 2022-08-30 | 中建八局第三建设有限公司 | A system is strutted to novel combination formula for pipe gallery excavation supporting |
-
2021
- 2021-09-10 CN CN202122190849.8U patent/CN215977295U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960675A (en) * | 2022-06-15 | 2022-08-30 | 中建八局第三建设有限公司 | A system is strutted to novel combination formula for pipe gallery excavation supporting |
| CN114960675B (en) * | 2022-06-15 | 2024-03-01 | 中建八局第三建设有限公司 | Combined supporting system for supporting foundation pit of pipe gallery |
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