CN115787663A - Foundation pit supporting structure and method - Google Patents
Foundation pit supporting structure and method Download PDFInfo
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- CN115787663A CN115787663A CN202211461482.1A CN202211461482A CN115787663A CN 115787663 A CN115787663 A CN 115787663A CN 202211461482 A CN202211461482 A CN 202211461482A CN 115787663 A CN115787663 A CN 115787663A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007906 compression Methods 0.000 claims abstract description 52
- 230000006835 compression Effects 0.000 claims abstract description 50
- 230000000694 effects Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Abstract
The invention discloses a foundation pit supporting structure and a foundation pit supporting method, and relates to the technical field of municipal road foundation pits. The problem that the support is easy to be sheared and broken or the joint is prone to water leakage is solved by the aid of the one-section support in the existing foundation pit. It includes: the device comprises a plurality of inner supports and a plurality of spherical hinge supports I, wherein the inner supports are horizontally arranged between underground continuous walls on two sides at intervals, two ends of each inner support are respectively connected with one spherical hinge support I, and the other end of each spherical hinge support I is fixedly connected to the underground continuous walls. The method comprises the following steps: fixedly connecting a jack of a foundation pit supporting structure to the bottom end of the middle part of the first horizontal support, wherein one ends of two compression-resistant screws of the inner support are respectively hinged with the bottom end of the jack, and the other ends of the two compression-resistant screws are respectively hinged with underground continuous walls on two sides; when the underground continuous wall deforms inwards, the jack contracts, and the two compression-resistant screws apply outward thrust to the underground continuous wall on two sides; when the underground continuous wall deforms outwards, the jack extends, and the two compression-resistant screws apply inward tension to the underground continuous wall on two sides.
Description
Technical Field
The invention relates to the technical field of municipal road foundation pit maintenance, in particular to a foundation pit supporting structure and a method.
Background
In the field of municipal engineering, the support between underground continuous walls inside a foundation pit is usually a one-section steel support or a concrete support. As shown in figure 1, the support 2 is fixedly connected with the underground continuous walls 1 at two sides, and when the underground continuous walls 1 at two sides are in a vertical state, the support 2 is only acted by axial force. However, as shown in fig. 2, under the long-term action of the outside soil-water pressure, the underground continuous wall 1 is prone to be displaced obliquely inwards, so that the joint between the underground continuous wall 1 and the support 2 is affected by the vertical force in addition to the axial force, the upper end of the support 2 is prone to be damaged by pressure under the influence of the vertical force, and the lower end of the support 2 is prone to be damaged by tension, so that the support 2 generates micro cracks, and further the structural stress is affected, even the support 2 is sheared and broken to cause the overturn or collapse of the underground continuous wall 1; in addition, because the underground continuous walls 1 are formed by framing pouring, the unbalanced stress on the inner side and the outer side of the underground continuous walls 1 can also cause large relative displacement between the adjacent underground continuous walls 1, so that flexible joints between the adjacent underground continuous walls 1 are damaged due to tensile stress to a certain degree, and the problem of water leakage at seams is caused.
Disclosure of Invention
The supporting structure aims at solving the problem that water leakage occurs at the joint because the one-section type support is fixedly connected between the underground continuous walls in the existing foundation pit, the underground continuous walls are inclined and displaced towards the inner side, the support is easy to be sheared and broken, or the flexible joint between the adjacent underground continuous walls is easy to be damaged by tensile stress. The invention aims to provide a foundation pit supporting structure and a foundation pit supporting method.
The technical scheme adopted by the invention for solving the technical problems is as follows: a foundation pit support structure, comprising: the device comprises a plurality of inner supports and a plurality of spherical hinge supports I, wherein the inner supports are horizontally arranged between underground continuous walls on two sides at intervals, two ends of each inner support are respectively connected with one spherical hinge support I, and the other end of each spherical hinge support I is fixedly connected to the underground continuous walls.
The foundation pit supporting structure comprises a plurality of inner supports which are horizontally arranged between underground continuous walls on two sides at intervals, and a jack fixedly connected to the bottom end of the middle part of a first horizontal support, wherein the bottom end of the jack is hinged to two compression-resistant screws of the inner supports through a second spherical hinge support, and the two compression-resistant screws are respectively hinged to surrounding purlins of the underground continuous walls on the two sides through the first spherical hinge support; because the two compression-resistant screws and the jack are arranged at included angles, when the underground continuous wall deforms inwards under the action of outside soil pressure, the jack contracts, so that the two compression-resistant screws apply outward thrust to the underground continuous wall at two sides; when the underground continuous wall is deformed outwards due to the expansion effect of the material supported inside, the jack is extended, so that the two compression-resistant screws apply inward tension to the underground continuous wall on two sides; by means of the two-section tension-compression type foundation pit supporting structure, relative displacement between adjacent underground continuous walls can be effectively corrected, and therefore the risk of water leakage at the joint of the underground continuous walls is reduced.
Furthermore, the inner support is made of a whole steel support or a whole reinforced concrete support.
Further, it still includes a plurality of jacks, the jack is vertical to be set up in the foundation ditch to perpendicular rigid coupling in first horizontal support middle part bottom, the bottom of jack is connected with spherical hinge support two, interior support includes two resistance to compression screw rods, and the length of every resistance to compression screw rod all is greater than 1/2 of both sides underground continuous wall interval L, and the one end of two resistance to compression screw rods is articulated with spherical hinge support two of jack bottom, and the other end of two resistance to compression screw rods is articulated with both sides underground continuous wall respectively.
In addition, the invention also provides a foundation pit supporting method, which comprises the following steps:
s1: the foundation pit supporting structure is arranged at the bottom of a first horizontal support in a foundation pit, a jack is fixedly connected to the bottom end of the middle part of the first horizontal support, one ends of two compression-resistant screws of an inner support are respectively hinged with a second spherical hinge support at the bottom end of the jack, and the other ends of the two compression-resistant screws are respectively hinged with underground continuous walls at two sides through the first spherical hinge support;
s2: when the underground continuous wall deforms inwards under the action of outside soil pressure, the jack contracts, and the two compression-resistant screws apply outward thrust to the underground continuous walls on the two sides; when the underground continuous wall is deformed outwards due to the expansion effect of the material supported inside, the jack is extended, and the two compression-resistant screws apply inward tension to the underground continuous walls on two sides.
Firstly, fixedly connecting a jack to the bottom end of the middle part of a first horizontal support, wherein one ends of two compression-resistant screw rods of the inner support are respectively hinged with a second spherical hinge support at the bottom end of the jack, and the other ends of the two compression-resistant screw rods are respectively hinged with surrounding purlins of underground continuous walls at two sides; because the two compression-resistant screws and the jack are arranged at included angles, when the underground continuous wall deforms inwards under the action of outside soil pressure, the jack contracts, so that the two compression-resistant screws apply outward thrust to the underground continuous walls on the two sides; when the underground continuous wall is deformed outwards due to the expansion effect of the material supported inside, the jack is extended, so that the two compression-resistant screws apply inward tension to the underground continuous wall on two sides; when large relative displacement exists between the adjacent underground continuous walls on the single side, the effect of reducing the relative displacement can be realized by adjusting the length of the jack; the foundation pit supporting method can indirectly change the length of the support in the foundation pit through the expansion and contraction of the jack, and further generate outward thrust or inward tension, so that the relative deformation between adjacent underground continuous walls is simply and efficiently reduced, and the subsequent construction risk caused by water leakage of the underground continuous walls after the foundation pit is excavated is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a one-section support disposed between underground continuous walls on two sides of a conventional foundation pit;
FIG. 2 is a schematic diagram of an existing foundation pit with underground continuous walls on two sides inclined and displaced towards the inner side;
fig. 3 is a schematic structural diagram of a foundation pit supporting structure according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a foundation pit supporting structure according to another embodiment of the present invention.
The numbers in the figures are as follows:
an underground diaphragm wall 1; a support 2; an inner support 3; a first spherical hinge support 5; a first horizontal support 6; a jack 34; a first compression screw 31; a second compression-resistant screw 32; and a second ball hinge support 35.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example 1
The foundation pit supporting structure of the present embodiment is described with reference to fig. 3, and includes: the underground diaphragm wall comprises a plurality of inner supports 3 and a plurality of spherical hinge supports I5, wherein the inner supports 3 are horizontally arranged between underground diaphragm walls 1 on two sides at intervals, two ends of each inner support 3 are respectively hinged with one spherical hinge support I5, and the other end of each spherical hinge support I5 is fixedly connected to the underground diaphragm wall 1.
The foundation pit supporting structure comprises a plurality of inner supports 3 which are horizontally arranged between underground continuous walls 1 on two sides at intervals, and a spherical hinge support 5 connected to two ends of each inner support 3, wherein the spherical hinge supports are connected between the inner supports 3 in the horizontal direction of the foundation pit and the underground continuous walls 1 on two sides, the stress form of the supports 2 between the underground continuous walls 1 on two sides is simply and efficiently changed, the stress form of the supports 2 is always axial stress, the supports 2 are prevented from being locally damaged due to vertical force, and the risk that the underground continuous walls 1 topple or collapse is reduced.
The inner support 3 is a whole steel support or a whole reinforced concrete support, and the technical scheme of the embodiment can be realized.
Example 2
The foundation pit supporting structure disclosed by the invention is described by combining a figure 4, and comprises a plurality of inner supports 3, a plurality of spherical hinge supports and a plurality of jacks 34, wherein the jacks 34 are vertically arranged in a foundation pit and are vertically and fixedly connected to the bottom end of the middle part of a first horizontal support 6, the bottom end of each jack 34 is connected with a second spherical hinge support 35, each inner support 3 comprises two compression-resistant screws, the length of each compression-resistant screw is greater than 1/2 of the distance L between the underground continuous walls 1 on two sides, one ends of the two compression-resistant screws are hinged to the second spherical hinge supports 35 at the bottom ends of the jacks 34, and the other ends of the two compression-resistant screws are respectively hinged to surrounding purlins of the underground continuous walls 1 on two sides.
The foundation pit support 2 structure comprises a plurality of inner supports 3 horizontally arranged between underground continuous walls 1 on two sides at intervals and a jack 34 fixedly connected to the bottom end of the middle part of a first horizontal support 6, wherein the bottom end of the jack 34 is hinged to two compression-resistant screws of the inner supports 3 through a second spherical hinge support 35, and the two compression-resistant screws are respectively hinged to surrounding purlins of the underground continuous walls 1 on two sides through a first spherical hinge support 5; because the two compression-resistant screws and the jack 34 are arranged at included angles, when the underground continuous wall 1 deforms inwards under the action of outside soil pressure, the jack 34 contracts, so that the two compression-resistant screws apply outward thrust to the underground continuous walls 1 on the two sides; when the underground continuous wall 1 deforms outwards due to the expansion effect of the materials supported inside, the jack 34 extends, so that the two compression-resistant screws apply inward tension to the underground continuous walls 1 on the two sides; by means of the two-section tension-compression type foundation pit supporting structure, relative displacement between the adjacent underground continuous walls 1 can be effectively corrected, and therefore the risk of water leakage at the joints of the underground continuous walls 1 is reduced.
Example 3
The method for supporting a foundation pit according to this embodiment is described with reference to fig. 4, and includes the following steps:
s1: the foundation pit supporting structure in the embodiment 2 is arranged at the bottom of a first horizontal support 6 in a foundation pit, a jack 34 is fixedly connected to the bottom end of the middle part of the first horizontal support 6, one ends of two compression-resistant screws of an inner support 3 are respectively hinged with a second spherical hinge support 35 at the bottom end of the jack 34, and the other ends of the two compression-resistant screws are respectively hinged with surrounding purlins of underground continuous walls 1 on two sides through a first spherical hinge support 5;
s2: when the underground continuous wall 1 deforms inwards under the action of outside soil pressure, the jack 34 contracts, so that the two compression-resistant screws apply outward thrust to the underground continuous walls 1 on the two sides; when the underground continuous wall 1 is deformed outwards due to the expansion of the material of the internal support, the jack 34 is extended, so that the two compression screws apply inward tension to the underground continuous wall 1 on two sides.
In the foundation pit supporting method of the embodiment, firstly, a jack 34 is fixedly connected to the bottom end of the middle part of a first horizontal support 6, one ends of two compression-resistant screws of an inner support 3 are respectively hinged with a second spherical hinge support 35 at the bottom end of the jack 34, and the other ends of the two compression-resistant screws are respectively hinged with surrounding purlins of underground continuous walls 1 on two sides; because the two compression-resistant screws and the jack 34 are arranged at included angles, when the underground continuous wall 1 deforms inwards under the action of outside soil pressure, the jack 34 contracts, so that the two compression-resistant screws apply outward thrust to the underground continuous walls 1 on the two sides; when the underground continuous wall 1 is deformed outwards due to the expansion of the material supported inside, the jack 34 is extended, so that the two compression screws apply inward tension to the underground continuous wall 1 on two sides; when large relative displacement exists between the adjacent underground continuous walls 1 on one side, the effect of reducing the relative displacement can be realized by adjusting the length of the jack 34; according to the foundation pit supporting method, the length of the support 3 in the foundation pit can be indirectly changed through the extension and contraction of the jack 34, and then outward thrust or inward tension is generated, so that the relative deformation between the adjacent underground continuous walls 1 is simply and efficiently reduced, and the subsequent construction risk caused by water leakage of the underground continuous walls 1 after the foundation pit is excavated is reduced.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (4)
1. A foundation pit support structure, comprising: the underground diaphragm wall structure comprises a plurality of inner supports and a plurality of spherical hinge supports I, wherein the inner supports are horizontally arranged between underground diaphragm walls on two sides at intervals, two ends of each inner support are respectively connected with one spherical hinge support I, and the other end of each spherical hinge support I is fixedly connected to the underground diaphragm wall.
2. The foundation pit support structure of claim 1, wherein: the inner support is made of a whole steel support or a whole reinforced concrete support.
3. The foundation pit support structure of claim 1, wherein: it still includes a plurality of jacks, the jack is vertical to be set up in the foundation ditch to perpendicular rigid coupling in first horizontal support middle part bottom, the bottom of jack is connected with spherical hinge support two, interior support includes two resistance to compression screw rods, and the length of every resistance to compression screw rod all is greater than 1/2 of both sides underground continuous wall interval L, and the one end of two resistance to compression screw rods is articulated with spherical hinge support two of jack bottom, and the other end of two resistance to compression screw rods is articulated with both sides underground continuous wall respectively.
4. A foundation pit supporting method is characterized by comprising the following steps:
s1: the foundation pit supporting structure according to claim 3 is arranged at the bottom of a first horizontal support in a foundation pit, a jack is fixedly connected to the bottom end of the middle part of the first horizontal support, one ends of two compression-resistant screws of the inner support are respectively hinged with a second spherical hinge support at the bottom end of the jack, and the other ends of the two compression-resistant screws are respectively hinged with underground continuous walls at two sides through the first spherical hinge supports;
s2: when the underground continuous wall deforms inwards under the action of outside soil pressure, the jack contracts, and the two compression-resistant screws apply outward thrust to the underground continuous walls on the two sides; when the underground continuous wall is deformed outwards due to the expansion effect of the material supported inside, the jack is extended, and the two compression-resistant screws apply inward tension to the underground continuous wall on two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211461482.1A CN115787663A (en) | 2022-11-17 | 2022-11-17 | Foundation pit supporting structure and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211461482.1A CN115787663A (en) | 2022-11-17 | 2022-11-17 | Foundation pit supporting structure and method |
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| CN115787663A true CN115787663A (en) | 2023-03-14 |
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| CN202211461482.1A Pending CN115787663A (en) | 2022-11-17 | 2022-11-17 | Foundation pit supporting structure and method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208201884U (en) * | 2018-04-13 | 2018-12-07 | 嘉兴市嘉泽园艺有限公司 | A kind of bridge pattern foundation pit supporting structure |
| CN112610028A (en) * | 2020-12-22 | 2021-04-06 | 上海建工集团股份有限公司 | Adjusting device and adjusting method for supporting axial force of steel supporting system |
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2022
- 2022-11-17 CN CN202211461482.1A patent/CN115787663A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208201884U (en) * | 2018-04-13 | 2018-12-07 | 嘉兴市嘉泽园艺有限公司 | A kind of bridge pattern foundation pit supporting structure |
| CN112610028A (en) * | 2020-12-22 | 2021-04-06 | 上海建工集团股份有限公司 | Adjusting device and adjusting method for supporting axial force of steel supporting system |
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