CN217811059U - Combined temporary foundation pit supporting structure - Google Patents
Combined temporary foundation pit supporting structure Download PDFInfo
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- CN217811059U CN217811059U CN202220501332.8U CN202220501332U CN217811059U CN 217811059 U CN217811059 U CN 217811059U CN 202220501332 U CN202220501332 U CN 202220501332U CN 217811059 U CN217811059 U CN 217811059U
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Abstract
The utility model discloses a combined temporary foundation pit supporting structure, including outer row fender pile, temporary fender pile, prestressed anchorage cable and level to propping up the structure, the utility model discloses a temporary foundation pit supporting structure, under the condition that has important building to protect to the foundation pit periphery, through outer row fender pile provide the guard action at the foundation pit edge to foundation pit and peripheral important building when the foundation pit excavates, divide foundation pit construction into two regions through temporary fender pile simultaneously, strut the foundation pit within the temporary fender pile through prestressed anchorage cable, be under construction to the foundation pit in this region earlier; after the construction of the internal area is completed, the areas between the building structures extending from the axial surfaces of the externally arranged support piles and the temporary support piles are supported and constructed through the horizontal pair supporting structures. The utility model discloses a combined interim underground structure effectively struts the foundation ditch to the peripheral condition that has important building to protect of foundation ditch under, guarantees construction safety, and the cost is with low costs, and maneuverability is strong.
Description
Technical Field
The utility model relates to a combined interim underground structure relates to underground structure engineering technical field.
Background
The foundation pit support is a supporting, blocking, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit. The definition of the foundation pit support by the industry standard of the people's republic of China, namely technical code for supporting foundation pits in buildings JGJ120-2012, is as follows: in order to protect the construction of the underground main structure and the safety of the surrounding environment of the foundation pit, the foundation pit is temporarily supported, reinforced, protected and controlled by underground water.
In the construction of foundation pit engineering, such as the foundation pit of an urban area, important buildings at the periphery need to be protected, and the foundation pit can not be supported by the conventional pile anchor construction.
At present, in the prior art, a reasonable supporting mode and a reasonable supporting structure are lacked under the condition that important buildings need to be protected around a foundation pit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a combined interim underground structure effectively struts the foundation ditch under the condition that has important building to protect to the foundation ditch periphery, guarantees construction safety, and the cost is with low costs, and maneuverability is strong.
In order to realize the technical purpose, the technical effect is achieved, the utility model discloses a realize through following technical scheme:
the utility model provides a combined interim foundation ditch supporting construction, is including arranging fender pile, interim fender pile, prestressed anchorage cable and level to propping the structure outward, arrange the fender pile outward and be located the foundation ditch edge, interim fender pile is located and separates the foundation ditch for two construction areas in the foundation ditch, the prestressed anchorage cable anchors outward in interim fender pile and the extension of arranging fender pile outward but not more than arranging the fender pile outward, the level is to propping the structural mounting and is being the level between the building structure of arranging fender pile and interim fender pile axial plane extension outward and prop the structure.
Further, the outer row of support piles are cast-in-place piles with the diameter of 800-1200mm, and the outer edge of each outer row of support pile is provided with a triaxial stirring water-stopping pile with the diameter of 850 mm.
Furthermore, the temporary support piles are cast-in-place bored piles with the diameter of 600-800 mm.
Further, the prestressed anchor cable is externally anchored to the temporary supporting piles, is anchored to the outward row of supporting piles and extends downwards, and the included angle between the prestressed anchor cable and the horizontal plane is 20-30 degrees;
the tail end of the prestressed anchor cable does not exceed the axial plane of the outer row of supporting piles.
Further, the horizontal opposite-supporting structure comprises a supporting steel pipe and a head steel plate;
the supporting steel pipe is a Q235b steel pipe with the outer diameter of 609mm and the wall thickness of 16 mm; the head steel plate is pre-buried in the building structure that outer row fender pile and interim fender pile axial face extend, and the stiff end and the head steel plate welded connection of support steel pipe, weld height hf is not less than 8mm.
The utility model has the advantages that:
the utility model discloses a combined temporary foundation pit supporting structure, including outer row fender pile, interim fender pile, prestressed anchorage cable and level to propping structure, the utility model discloses an interim foundation pit supporting structure, to the foundation pit periphery have under the condition that important building needs the protection, provide the guard action at the foundation pit edge to foundation pit and peripheral important building when the foundation pit excavation through outer row fender pile, divide the foundation pit construction into two regions through interim fender pile simultaneously, strut the foundation pit within interim fender pile through the prestressed anchorage cable, carry out the construction to the foundation pit in this region earlier; after the construction of the internal area is completed, supporting and constructing areas among the building structures extending from the axial surfaces of the externally arranged support piles and the temporary support piles through the horizontal opposite-supporting structures;
the utility model discloses a combined interim underground structure effectively struts the foundation ditch under the condition that has important building to protect to the foundation ditch periphery, guarantees construction safety, and the cost is with low costs, and maneuverability is strong.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
Fig. 1 is a schematic structural view of an outer row of support piles, a temporary support pile and a prestressed anchor cable according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an outer row of support piles, a temporary support pile and a horizontal counter-support structure according to an embodiment of the present invention;
in the drawings, the reference numerals correspond to the following components:
the method comprises the following steps of 1-externally discharging support piles, 2-temporary support piles, 3-prestressed anchor cables, 4-triaxial stirring water stop piles and 5-horizontal opposite bracing structures.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1-2
The utility model provides a combined interim foundation ditch supporting construction, includes outer row fender pile 1, interim fender pile 2, prestressed anchorage cable 3 and level to propping structure 5, outer row fender pile 1 is located the foundation ditch edge, and interim fender pile 2 is located and separates the foundation ditch for two construction areas in the foundation ditch, prestressed anchorage cable 3 outer anchor is in interim fender pile 2 and the extension of outer row fender pile 1 but not more than outer row fender pile 1, the level is installed and is made the level to propping between the building structure of outer row fender pile 1 and the extension of interim fender pile 2 axial plane to propping structure 5.
The outer row of support piles 1 are cast-in-place piles with the diameter of 800-1200mm, and the outer edge of each outer row of support pile 1 is provided with a triaxial stirring water stop pile 4 with the diameter of 850 mm.
The temporary support pile 2 is a long spiral cast-in-place pile with the diameter of 600-800 mm.
The prestressed anchor cable 3 is externally anchored to the temporary support piles 2, is anchored to the outward row of support piles 1 and extends downwards, and forms an included angle of 20-30 degrees with the horizontal plane;
the tail end of the prestressed anchor cable 3 does not exceed the axial plane of the outer row of supporting piles 1.
The horizontal opposite-supporting structure 5 comprises a supporting steel pipe and a head steel plate;
the supporting steel pipe is a Q235b steel pipe with the outer diameter of 609mm and the wall thickness of 16 mm; the head steel plate is pre-buried in the building structure that outer row fender pile and interim fender pile axial face extend, and the stiff end and the head steel plate welded connection of support steel pipe, weld height hf is not less than 8mm.
The utility model discloses a combined temporary foundation pit supporting structure, including outer row fender pile, temporary fender pile, prestressed anchorage cable and level to propping up the structure, the utility model discloses a temporary foundation pit supporting structure, under the condition that has important building to protect to the foundation ditch periphery, provides the guard action at the foundation ditch edge to foundation ditch and peripheral important building when the foundation ditch excavation through outer row fender pile, separates the foundation ditch construction into two regions through temporary fender pile simultaneously, struts the foundation ditch within the temporary fender pile through the prestressed anchorage cable, carries out the construction to the foundation ditch in this region earlier; after the construction of the internal area is completed, the areas between the building structures extending from the axial surfaces of the externally arranged support piles and the temporary support piles are supported and constructed through the horizontal pair supporting structures.
Example 2
The Majia camp city and village reconstruction project (A3, A4 plot) comprises 5 high-rise buildings with 23-34 floors, and the buildings adopt a phi 600mm long spiral drilling pressure-grouting pile plus bearing platform foundation type. According to a general plane diagram and a foundation pit excavation diagram provided by a construction side, an A4 block is connected with a basement of the A1 block, an underground 3 layer is arranged below the A3 and A4 blocks integrally, the elevation of the top of a waterproof board is 0.5% of the gradient from the A4 block to the A3 block, the thickness of the waterproof board of the basement is 0.65m, the thickness of a cushion layer is 0.10mm, the elevation of the basement base of the A3 block is 1880.40-1880.85 m, the elevation of the basement base of a main building is 1879.30-1880.00m, the elevation of the basement base of the A4 block is 1880.80-1881.10 m, the elevation of the basement base of the main building is 1880.05-1880.25 m, the excavation depth of the foundation pit is 12.3-13.0 m, and the circumference of a foundation pit support is 652.2m.
Ambient environment
A3, north side of the foundation pit of the plot: the distance between the side and the red line is only 3.1m, the outside of the red line is a planned road, the planned road is built for a construction unit, construction is carried out after the foundation pit is backfilled, the planned road is used as a construction channel during construction, a 2-7F brick-concrete structure is arranged on the other side of the planned road, and the distance between the planned road and the foundation pit is 18.7-20.1 m.
A3, south side of a foundation pit of the plot: the distance from the bottom side line of the side group pit to the red line is only 2.85m, the outer side of the red line is a Jinhua road, the distance from the foundation pit to the border of the curb stone is 7.2m, and the road width is 15m.
A3, west side of a foundation pit of the land parcel: the distance from the bottom side line of the side pit to the red line is only 6.95m, the distance from the red line to the outside is ten thousand-Hua road, the distance from the foundation pit to the edge of the curb stone is 10.0m, and the road width is 20m.
A4, north side of a foundation pit of the land block: the distance between the bottom side line of the side pit and the red line is only 3.0m, the outside of the red line is used for building a planned road for a construction unit, the planned road is constructed after backfilling a foundation pit, the planned road is used as a construction channel during construction, the other side of the planned road is an A1 block, the A1 block is empty, and the A1 is connected with an A4 block basement.
A4, east side of a foundation pit of the land parcel: the distance between the bottom side line of the side pit and the red line is 8.0-8.5 m, the outside of the red line is a 7F brick-concrete structure civil house, the foundation is a pile foundation, and the side building is 8.0m closest to the bottom side line of the foundation pit excavation.
A4, south side of a foundation pit of the plot: the distance between the bottom side line of the side pit and the red line is 7.5m, the distance between the bottom side line of the side pit and the red line is 2-7F brick-concrete structure, the side pit is a pile foundation (a southwest corner 3-layer building is a shallow foundation), and the distance between the side building and the excavation line of the foundation pit is only 4m.
And (3) foundation pit peripheral pipelines: the west side and the south side of the A3 land are municipal roads, and underground pipe networks such as intensive drainage, water supply, sewage, telecommunication, gas and the like are distributed on the municipal roads.
Therefore, important buildings are arranged around the foundation pit construction, and the conventional supporting mode has the technical problems introduced in the background technology.
Construction sequence among the plots:
(1) firstly constructing a supporting structure and a main structure of A3 and A4 plots → (2) then constructing an A1 basement and the main structure → (3) constructing a connecting channel between the A4 and A1 plots
Pile anchor construction sequence:
(1) the method comprises the steps of leveling a field → (2) positioning and paying off, determining a foundation pit excavation line → (3) clearing obstacles → (4) rechecking water-stop piles, supporting pile axis positions → (5) positioning pile positions, constructing the water-stop piles first and then constructing the supporting piles → (6) excavating pile top crown beam earthwork and manually chiseling pile heads, constructing anchor cables when anchor cables exist at the pile top crown beams (the positions of the crown beams), constructing the crown beams after the anchor cables are maintained, tensioning and locking the anchor cables, tensioning and then spraying concrete after the anchor cables are maintained, excavating the earthwork to 50cm below the first row of anchor cables, constructing the anchor cables, constructing a waist beam after the anchor cables are maintained, locking the anchor cables → (8) hanging the anchor cables, constructing and positioning short steel bars, spraying concrete → (9) after concrete spraying surface maintenance is completed, excavating the anchor cables to the lower row of the earthwork, repeating concrete spraying construction of the anchor cables, constructing the waist beams, and excavating the earthwork to the designed elevation of the pit bottom.
The construction sequence of the combined temporary foundation pit supporting structure is as follows:
(1) the method comprises the following steps of (1) carrying out rechecking water stop pile and supporting pile axial line position → (2) positioning, constructing the water stop pile firstly and then constructing the supporting pile, carrying out cross construction of the water stop pile and the supporting pile → (3) supporting pile and drilling a pile head, constructing a pile top crown beam, after maintenance of the crown beam is finished, excavating earthwork to a platform elevation 1889.30m → (4) carrying out slope discharge and concrete spraying of the top of the inner side supporting pile to the top of the crown beam → (5) constructing the inner side supporting pile, the supporting pile and drilling a pile head, constructing an anchor cable and the crown beam, after maintenance of the crown beam is finished, locking the anchor cable, excavating the earthwork to 50cm below the second row of anchor cables, constructing the anchor cable, and constructing a waist beam after maintenance of the anchor cable is finished, tensioning and locking anchor cables → (6) hanging reinforcing mesh and construction positioning short steel bars and then spraying concrete → (7) after concrete spraying surface maintenance is completed, excavating the earthwork to the lower anchor cables, repeating reinforcing mesh spraying concrete construction, anchor cable construction, waist beam construction, excavating the earthwork to the pit bottom design elevation → (8) constructing a main structure pile cap, a basement bottom plate and a shear wall → (9) constructing a main building basement to a-2F bottom plate, embedding and supporting purlins in the main building floor during the basement construction process, installing a second steel pipe support → excavating the earthwork between two rows of supporting piles after the basement structure maintenance reaches 80% of the strength, and dismantling the anchor cables →
And excavating the earthwork to the position of the second steel support, mounting the steel supports, and excavating the earthwork between the two rows of support piles to the pit bottom to construct a basement and an outer shear wall.
In construction, the outer row of support piles are cast-in-place piles with the diameter of 800-1200mm, and the outer edges of the outer row of support piles are provided with triaxial stirring water-stopping piles with the diameter of 850 mm.
The temporary supporting piles are cast-in-place bored piles with the diameter of 600-800 mm.
The prestressed anchor cable is externally anchored on the temporary supporting piles, is anchored by the outward-arranged supporting piles, extends downwards and forms an included angle of 20-30 degrees with the horizontal plane;
the tail end of the prestressed anchor cable does not exceed the axial plane of the outer row of support piles.
The horizontal opposite-supporting structure comprises a supporting steel pipe and a head steel plate;
the supporting steel pipe is a Q235b steel pipe with the outer diameter of 609mm and the wall thickness of 16 mm; the head steel sheet is pre-buried in the building structure that outer row fender pile and interim fender pile axial face extend, supports the stiff end and the head steel sheet welded connection of steel pipe, and the welding seam height hf is not less than 8mm.
The construction method and the execution standard are according to the design requirements;
aiming at the condition that important buildings need to be protected at the periphery of a foundation pit, the foundation pit and the surrounding important buildings are protected at the edge of the foundation pit through an outer row of support piles when the foundation pit is excavated, meanwhile, the foundation pit construction is divided into two areas through temporary support piles, the foundation pit in the temporary support piles is supported through prestressed anchor cables, and the foundation pit in the area is constructed firstly; after the construction of the internal area is completed, the areas between the building structures extending from the axial surfaces of the externally arranged support piles and the temporary support piles are supported and constructed through the horizontal pair supporting structures.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a combined interim underground structure which characterized in that: the outer row of supporting piles is located at the edge of a foundation pit, the temporary supporting piles are located in the foundation pit and divide the foundation pit into two construction areas, the prestressed anchor cable is anchored outside the temporary supporting piles and extends towards the outer row of supporting piles but does not exceed the outer row of supporting piles, and the horizontal bracing structure is installed between the building structures extending towards the axial surfaces of the outer row of supporting piles and the temporary supporting piles.
2. A combined temporary foundation pit supporting structure according to claim 1, wherein: the outer row of support piles are cast-in-place piles with the diameter of 800-1200mm, and the outer edges of the outer row of support piles are provided with triaxial stirring water-stopping piles with the diameter of 850 mm.
3. A combined temporary foundation pit supporting structure according to claim 1, wherein: the temporary supporting piles are cast-in-place bored piles with the diameter of 600-800 mm.
4. A combined temporary foundation pit supporting structure according to claim 1, wherein: the prestressed anchor cable is externally anchored to the temporary support piles, is anchored to the outward row of support piles and extends downwards, and the included angle between the prestressed anchor cable and the horizontal plane is 20-30 degrees;
the tail end of the prestressed anchor cable does not exceed the axial plane of the outer row of support piles.
5. A combined temporary foundation pit supporting structure according to claim 1, wherein: the horizontal opposite-supporting structure comprises a supporting steel pipe and a head steel plate;
the supporting steel pipe is a Q235b steel pipe with the outer diameter of 609mm and the wall thickness of 16 mm; the head steel plate is pre-buried in the building structure that outer row fender pile and interim fender pile axial face extend, and the stiff end and the head steel plate welded connection of support steel pipe, weld height hf is not less than 8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220501332.8U CN217811059U (en) | 2022-03-08 | 2022-03-08 | Combined temporary foundation pit supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220501332.8U CN217811059U (en) | 2022-03-08 | 2022-03-08 | Combined temporary foundation pit supporting structure |
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| CN217811059U true CN217811059U (en) | 2022-11-15 |
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| CN202220501332.8U Active CN217811059U (en) | 2022-03-08 | 2022-03-08 | Combined temporary foundation pit supporting structure |
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