CN217580187U - Supporting-free graded excavation supporting structure for foundation pit - Google Patents
Supporting-free graded excavation supporting structure for foundation pit Download PDFInfo
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- CN217580187U CN217580187U CN202220853422.3U CN202220853422U CN217580187U CN 217580187 U CN217580187 U CN 217580187U CN 202220853422 U CN202220853422 U CN 202220853422U CN 217580187 U CN217580187 U CN 217580187U
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Abstract
The utility model discloses a hierarchical excavation supporting construction of foundation ditch no support relates to civil engineering construction technical field. The problem that a cement-soil gravity type enclosure wall is easy to deform in the existing soft soil support-free supporting technology is solved. It includes a plurality of supporting components that set up along foundation ditch outside circumference, supporting components includes at least one soil body bearing stake, at least one connection pull rod and anchor and draws the device, and at least one soil body bearing stake from top to bottom inclines in proper order and the interval sets up in the foundation ditch outside soil body, and the bottom of soil body bearing stake is connected in foundation ditch envelope, and the top of soil body bearing stake is connected with the guan liang at foundation ditch envelope top through connecting the pull rod.
Description
Technical Field
The utility model relates to a civil engineering construction technical field, in particular to hierarchical excavation supporting construction of foundation ditch unsupported.
Background
In recent years, an attempt of a supporting-free technology in soft soil is made in China, and supporting methods such as cantilever pile arrangement, slope release, double-row pile and reserved back pressure soil are commonly used. The soil-cement gravity type enclosure wall is formed by forcibly stirring soil and input cement paste or lime in situ by adopting a deep mixer to form a continuously lapped soil-cement columnar reinforced retaining wall, fully utilizes the strength and the water seepage prevention performance of the soil-cement and is a retaining wall and an anti-seepage curtain.
The cement soil gravity type enclosure wall can be approximately regarded as a rigid wall body in a soft soil foundation, and the deformation of the cement soil gravity type enclosure wall mainly represents horizontal translation of the wall body, forward tilting of the top of the wall, forward sliding of the bottom of the wall, superposition of several kinds of deformation and the like. The destruction modes of the cement soil gravity type enclosure wall mainly include the following modes: the wall body and the adjacent soil body are damaged by integral sliding and the basement soil body is raised due to insufficient soil penetration depth of the wall body or the reasons of weak soil body at the bottom of the wall, insufficient shear strength and the like; the soil pressure at the rear side of the wall body is increased due to soil squeezing construction, foundation pit side stacking loading, heavy construction mechanical action and the like at the rear side of the wall body, or the wall body is overturned due to insufficient anti-overturning stability of the wall body; the strength of the soil body in the front passive area of the wall body is low, and the anti-skid stability of the design is not enough, so that the deformation of the wall body is overlarge or the integral rigid movement is caused; when the compressive strength, the shear strength or the tensile strength of the designed wall body is not enough, or the construction quality cannot meet the design requirements, the wall body is damaged by pressure, shear or tension and the like.
Disclosure of Invention
The problem that a cement gravity type enclosure wall in the existing soft soil unsupported support technology is easy to deform is solved.
The utility model aims at providing a hierarchical excavation supporting construction of foundation ditch no support.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a hierarchical excavation supporting construction of foundation ditch unsupported, it includes a plurality of supporting components that set up along foundation ditch outside circumference, supporting components includes at least one soil body bearing stake, at least one connection pull rod and anchor and draws the device, and at least one soil body bearing stake from top to bottom inclines in proper order and the interval sets up in the foundation ditch outside soil body, and the bottom of soil body bearing stake is connected in foundation ditch envelope, and the top of soil body bearing stake is connected with the hat roof beam at foundation ditch envelope top through connecting the pull rod.
The utility model discloses a supporting-free graded excavation supporting structure of a foundation pit, which comprises at least one layer of soil body bearing pile, at least one connecting pull rod and an anchoring device, wherein a first layer of soil body bearing pile is obliquely erected outside the pit, the bottom end of the first layer of soil body bearing pile is connected with a foundation pit enclosure structure, the other end of the first layer of soil body bearing pile is connected with a top beam at the top of the foundation pit enclosure structure through the connecting pull rod I, the soil body in the area between the foundation pit enclosure structure and the first layer of soil body bearing pile forms a triangular wedge body in the excavation process of the first layer of soil body, when the soil body generates sliding displacement towards the pit, a supporting frame consisting of the first layer of soil body bearing pile, the connecting pull rod I and the anchoring device is anchored at the lower part of the first layer of soil body bearing pile, the anti-slip capability of the soil body is improved, the horizontal translation and the inward inclination of the wall body of the foundation pit enclosure structure are effectively controlled, then a second layer of soil body bearing pile is obliquely erected outside the first layer of soil body bearing pile, the bottom end of the second layer of soil body bearing pile is connected to the foundation pit enclosure structure, the other end of the second layer of soil body bearing pile is respectively connected with the first layer of soil body bearing pile and the crown beam through a connecting pull rod II, in the excavation process of the second layer of soil body, a supporting frame formed by the second layer of soil body bearing pile, the connecting pull rod II and the anchoring device is anchored on the soil body at the lower part of the second layer of soil body bearing pile, the horizontal translation and the inward inclination of the wall body of the foundation pit enclosure structure are further controlled, and the like, until the excavation of the foundation pit soil body is completed; this supporting-free graded excavation supporting structure of foundation ditch combines the hierarchical excavation of foundation ditch soil body, make full use of foundation ditch retaining structure outside soil body dead weight for soil body bearing pile, the braced frame anchor that connecting pull rod and anchor draw gear constitute is in soil body bearing pile bottom soil body, the anchor pulling force that the anchor draw gear produced has improved the normal pressure on perpendicular to soil body bearing pile surface, the anti-sliding friction power between soil body bearing pile and the soil body has been increased, the cling compound ability of the fracture face has effectively been improved, reduce wall body horizontal translation and to the downthehole slope, avoid foundation ditch retaining structure wall body to take place horizontal translation, the wall top leans forward, the wall end is preceding to slide and the superimposed construction problem of several kinds of deformations.
Furthermore, the soil body supporting pile is provided with a rough surface.
Furthermore, the anchoring device and the soil body bearing pile are arranged at an included angle.
Furthermore, the bottom end of the soil body bearing pile is flush with the excavation completion surface of the corresponding soil body layer in the foundation pit.
Furthermore, the soil body bearing piles are all arranged along the soil body slip crack surface.
Furthermore, the foundation pit support structure further comprises a reinforcing structure, wherein the reinforcing structure is positioned at the bottom of the inner side of the foundation pit and corresponds to the support assembly in position.
The foundation pit support structure is made of steel pipe piles, and adjacent steel pipe piles are connected through lock catches.
Drawings
Fig. 1 to fig. 4 are the schematic diagram of the construction process of the supporting-free graded excavation supporting structure of the foundation pit in an embodiment of the present invention.
The numbers in the figures are as follows:
a foundation pit support structure 1; a crown beam 2; a reinforcing structure 3; a permanent structure 5; a first layer of soil body bearing pile 11; a first connecting pull rod 14; the first anchoring device 15; a second layer of soil bearing piles 21; a second connecting pull rod 24; and a second anchoring device 25.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be noted that the drawings are in a very simplified form and are not to precise scale, which is only used for the purpose of facilitating and clearly explaining 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 should not be construed as limiting the technical solution of the present invention.
This embodiment is taken the foundation ditch engineering of certain building that has three-layer underground structure as an example, the hierarchical excavation of foundation ditch soil body, set up supporting construction step by step simultaneously outside the foundation ditch, combine fig. 1 to fig. 4 below to explain the utility model discloses a hierarchical excavation supporting construction of foundation ditch unsupported, it includes a plurality of supporting components that set up along foundation ditch outside circumference, supporting component includes first layer soil body bearing pile 11, second floor soil body bearing pile 21, connect pull rod one 14, connect pull rod two 24, anchor draw device one 15 and anchor draw device two 25, first layer soil body bearing pile 11 and second floor soil body bearing pile 21 from top to bottom slope in proper order and the interval sets up in the foundation ditch outside soil body, the bottom of first layer soil body bearing pile 11 and second floor soil body bearing pile 21 is connected in foundation ditch enclosure structure 1, the top of first layer soil body bearing pile 11 is connected with first layer soil body bearing pile 11 and crown beam 2 at the foundation ditch enclosure structure 1 top through connecting pull rod one 14, the top of second floor soil body bearing pile 21 is connected with first layer bearing pile 11 and crown beam 2 respectively through connecting pull rod two 24, the bearing pile of second floor bearing pile 11 and second floor bearing pile 21 use the anchor draw device to be connected with the foundation ditch outside and anchor draw device (anchor) and anchor draw one side respectively.
The utility model discloses a supporting-free graded excavation supporting structure of foundation pit, which comprises at least one layer of soil body bearing pile, at least one connecting pull rod and an anchoring device, a first layer of soil body bearing pile 11 is obliquely erected outside the pit, the bottom end of the first layer of soil body bearing pile 11 is connected with a foundation pit enclosure structure 1, the other end of the first layer of soil body bearing pile is connected with a top beam 2 at the top of the foundation pit enclosure structure 1 through a connecting pull rod I14, the soil body in the area between the foundation pit enclosure structure 1 and the first layer of soil body bearing pile 11 forms a triangular wedge body in the excavation process of the first layer of soil body, when the soil body generates sliding displacement towards the pit, a supporting frame formed by the first layer of soil body bearing pile 11, the connecting pull rod I14 and the anchoring device is anchored at the lower part of the first layer of soil body bearing pile 11, the anti-skidding capacity of the soil is improved, the horizontal translation and the inward inclination of the wall of the foundation pit enclosure structure 1 are effectively controlled, then, a second layer of soil bearing pile 21 is obliquely erected outside the first layer of soil bearing pile 11, the bottom end of the second layer of soil bearing pile 21 is connected to the foundation pit enclosure structure 1, the other end of the second layer of soil bearing pile is respectively connected with the first layer of soil bearing pile 11 and the crown beam 2 through a connecting pull rod II 24, in the process of excavating the second layer of soil, a supporting frame formed by the second layer of soil bearing pile 21, the connecting pull rod II 24 and an anchoring device is anchored on the soil below the second layer of soil bearing pile, the horizontal translation and the inward inclination of the wall of the foundation pit enclosure structure 1 are further controlled, and the analogy is carried out until the excavation of the foundation pit soil is completed; this foundation ditch does not have hierarchical excavation supporting structure of support, combine the hierarchical excavation of foundation ditch soil body, make full use of foundation ditch retaining structure 1 outside soil body dead weight for soil body bearing pile, the braced frame anchor that connecting pull rod and anchor pull device constitute is in the soil body of soil body bearing pile bottom, the anchor pulling force that the anchor pull device produced has improved the normal pressure on perpendicular to soil body bearing pile surface, the anti-sliding friction power between soil body bearing pile and the soil body has been increased, the cling compound ability of the slip crack face has effectively been improved, reduce wall body horizontal translation and inwards slope, avoid foundation ditch retaining structure 1 wall body to take place horizontal translation, the wall top leans forward, the wall end is slided forward and the superimposed construction problem of several kinds of deformations.
Further, the surfaces of the first layer of soil bearing pile 11 and the second layer of soil bearing pile 21 are roughened, and under the condition that the sliding soil mass on the upper portion of the soil bearing pile is certain, the friction coefficient between the soil bearing pile and the soil can be effectively increased.
As shown in fig. 1 and 2, the anchor device and the soil supporting pile are arranged at an included angle, the included angle is preferably 90 degrees, and the anchor device is vertically connected to the soil supporting pile, so that the anchoring force of the anchor device can be improved to the maximum extent.
As shown in fig. 3, the bottom end of the first layer of soil bearing pile 11 is flush with the finished surface of the first layer of soil excavation, the bottom end of the second layer of soil bearing pile 21 is flush with the finished surface of the second layer of soil excavation, when the bottom end of the soil bearing pile is flush with the finished surface of the corresponding layer of soil excavation in the foundation pit, the supporting frame formed by the soil bearing pile and the connecting pull rod can generate a pulling force opposite to the water and soil pressure direction on the foundation pit support structure 1, the safe implementation of the subsequent corresponding layer of soil excavation is ensured, and the foundation pit support structure 1 is prevented from deforming.
As shown in fig. 1 and 2, the first layer of soil bearing piles 11 and the second layer of soil bearing piles 21 are both arranged along the soil slip plane, the slip plane is an interface for the two parts of soil to slide relatively, and the soil bearing piles are anchored to the soil below the soil bearing piles through the anchoring devices connected with the soil bearing piles, so that the soil on two sides of the soil bearing piles is prevented from sliding, and the strength of the whole soil is damaged and destabilized.
The utility model discloses a hierarchical excavation supporting construction of foundation ditch unsupported includes still that reinforced structure 3, reinforced structure 3 are located the inboard bottom of foundation ditch to corresponding with the position of supporting component, when reinforced structure 3 can prevent that the foundation ditch soil body from excavating to the bottom of the hole, the passive soil pressure region at the bottom of the hole warp too big, through consolidate at the bottom of the hole can effectively solve the foundation ditch retaining structure 1 depth of insertion not enough and the bottom of the hole soil body intensity phenomenon such as the bottom of the hole uplift that arouses less.
The foundation pit support structure 1 of this embodiment adopts the construction of resonance-free steel-pipe pile, adopts the hasp form to connect between the steel-pipe pile, has small in noise, vibration weak point, crowded soil effect little, to peripheral structures influence advantage such as little, construction efficiency height.
The construction process of the supporting-free graded excavation supporting structure of the foundation pit of the utility model is described below with reference to fig. 1 to 4, and the steps are as follows:
reasonably setting the layered excavation depth of the foundation pit according to the excavation depth of the foundation pit;
constructing a foundation pit enclosure structure 1, connecting the tops of the foundation pit enclosure structure 1 into a whole by adopting a crown beam 2, and constructing a reinforcing structure 3 at the bottom of a pit;
as shown in fig. 1, according to mechanical parameters of a first layer of soil, calculating a slip plane of the first layer of soil excavation, which may cause damage to soil outside a pit, calculating an average included angle a between the slip plane and the ground, obliquely erecting a first layer of soil bearing pile 11 outside the pit along the included angle a, connecting the bottom end of the first layer of soil bearing pile 11 to a foundation pit enclosure 1, connecting the other end of the first layer of soil bearing pile to a crown beam 2 at the top of the foundation pit enclosure 1 through a first connecting pull rod 14, and vertically connecting an anchor device outside the first layer of soil bearing pile 11;
as shown in fig. 2, after excavation of a first layer of soil is completed, according to actual monitoring data of excavation of a foundation pit and mechanical parameters of soil above the bottom surface of the second layer of soil, calculating an average included angle β between a slip plane of the soil outside the pit and the ground in the excavation process of the second layer of soil, obliquely setting up a second layer of soil supporting pile 21 outside the pit along the included angle β, wherein the second layer of soil supporting pile 21 is arranged at the bottom of the first layer of soil supporting pile 11, the bottom end of the second layer of soil supporting pile 21 is connected to the foundation pit enclosure structure 1, the other end of the second layer of soil supporting pile 21 is connected with the first layer of soil supporting pile 11 and the crown beam 2 through a connecting pull rod two 24, and an anchoring and pulling device is vertically connected to the outer side of the second layer of soil supporting pile 21;
as shown in fig. 3, after the excavation of the second layer of soil body is completed, the excavation of the third layer of soil body is performed;
as shown in fig. 4, after the excavation of the third layer of soil body is completed, the structure construction is performed, and the unsupported graded excavation and support structure of the foundation pit can be used as a part of the permanent structure 5 or the pile pulling recovery is performed after the construction of the permanent structure 5 is completed.
The recycling construction sequence of the support-free graded excavation supporting structure of the foundation pit is as follows:
recovering the anchoring device connected with the second layer of soil bearing pile 21;
the second layer of soil body bearing pile 21 is recovered, and grouting is synchronously performed through the pile body in the recovery process, so that ground settlement is reduced;
recovering the anchoring device connected with the first layer of soil body bearing pile 11;
the first layer of soil body bearing pile 11 is recovered, and grouting is synchronously performed through the pile body in the recovery process, so that ground settlement is reduced;
the recovery construction effectively controls the disturbance of the pile body recovery to the surrounding environment in a mode of 'from far to near, graded recovery and synchronous grouting'.
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, so that any changes and modifications made by those skilled in the art according to the above disclosure are all within the scope of the appended claims.
Claims (7)
1. The utility model provides a hierarchical excavation supporting construction of foundation ditch unsupported which characterized in that: it includes a plurality of supporting components that set up along foundation ditch outside circumference, supporting components includes at least one soil body bearing stake, at least one connection pull rod and anchor and draws the device, and at least one soil body bearing stake from top to bottom inclines in proper order and the interval sets up in the foundation ditch outside soil body, and the bottom of soil body bearing stake is connected in foundation ditch envelope, and the top of soil body bearing stake is connected with the guan liang at foundation ditch envelope top through connecting the pull rod.
2. The unsupported hierarchical excavation supporting structure of foundation pit according to claim 1, characterized in that: the soil body bearing pile is provided with a rough surface.
3. The unsupported graded excavation and support structure of foundation pit of claim 1, characterized in that: the anchor device is an contained angle setting with soil body bearing stake.
4. The unsupported graded excavation and support structure of foundation pit of claim 1, characterized in that: and the bottom end of the soil body bearing pile is flush with the excavation completion surface of the corresponding soil body layer in the foundation pit.
5. The unsupported graded excavation and support structure of foundation pit of claim 1, characterized in that: the soil body bearing piles are all arranged along the soil body slip crack surface.
6. The unsupported hierarchical excavation supporting structure of foundation pit according to claim 1, characterized in that: the foundation pit supporting structure further comprises a reinforcing structure, wherein the reinforcing structure is located at the bottom of the inner side of the foundation pit and corresponds to the supporting component in position.
7. The unsupported hierarchical excavation supporting structure of foundation pit according to claim 1, characterized in that: the foundation pit support structure is made of steel pipe piles, and adjacent steel pipe piles are connected through lock catches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220853422.3U CN217580187U (en) | 2022-04-11 | 2022-04-11 | Supporting-free graded excavation supporting structure for foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220853422.3U CN217580187U (en) | 2022-04-11 | 2022-04-11 | Supporting-free graded excavation supporting structure for foundation pit |
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| CN217580187U true CN217580187U (en) | 2022-10-14 |
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| CN202220853422.3U Active CN217580187U (en) | 2022-04-11 | 2022-04-11 | Supporting-free graded excavation supporting structure for foundation pit |
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- 2022-04-11 CN CN202220853422.3U patent/CN217580187U/en active Active
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