CN219011237U - Foundation pit inclined support supporting structure - Google Patents
Foundation pit inclined support supporting structure Download PDFInfo
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- CN219011237U CN219011237U CN202223414075.3U CN202223414075U CN219011237U CN 219011237 U CN219011237 U CN 219011237U CN 202223414075 U CN202223414075 U CN 202223414075U CN 219011237 U CN219011237 U CN 219011237U
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Abstract
The utility model relates to a foundation pit inclined support supporting structure which comprises a crown beam, a prefabricated steel pipe supporting piece, a special-shaped supporting head and a supporting body, wherein the crown beam is fixed at the top of a foundation pit guard pile, the upper end of the prefabricated steel pipe supporting piece is fixedly connected with the crown beam, the lower end of the prefabricated steel pipe supporting piece is connected with the special-shaped supporting head, a through hole for forming a guide pipe is reserved in the prefabricated steel pipe supporting piece, a connecting port and a reserved orifice are arranged on the special-shaped supporting head and are mutually communicated, the connecting port is positioned at the joint of the special-shaped supporting head and the prefabricated steel pipe supporting piece and is communicated with the guide pipe, the reserved orifice is positioned on the side surface of the special-shaped supporting head, and the supporting body is formed by grouting overflowed from the reserved orifice and is used for fixing the lower end of the prefabricated steel pipe supporting piece and soil body. The prefabricated steel pipe support piece is a prefabricated component, so that the construction period is greatly shortened, and the prefabricated steel pipe support piece has good bearing capacity of bearing the shaft center under compression, bending and shearing, so that the safety of foundation pit support is improved; the method is suitable for different types of diagonal bracing supporting systems and deep foundation pits with different depths, and can be suitable for different geological conditions.
Description
Technical Field
The utility model relates to the technical field of foundation pit support, in particular to a foundation pit inclined support structure.
Background
The foundation pit engineering refers to building a set of foundation pit supporting structure system on a construction site to form a construction enclosure for underground engineering, and when the excavation depth exceeds 5 meters (including 5 meters), or the depth does not exceed 5 meters, the engineering with particularly complex geological conditions, surrounding environment and underground pipelines is called deep foundation pit engineering. Meanwhile, foundation pit engineering is also the key point and the difficulty of various civil engineering projects, the risk is high, major accidents are easy to generate in actual engineering, the construction progress is slow, the surrounding environment is destroyed, and thus huge economic loss is caused, and life safety is even endangered, so that the foundation pit supporting structure is one of the indispensable means for protecting the safety of underground structure construction and the surrounding environment of the foundation pit.
With the development of economy, urban construction is continuously developed, the utilization of underground space is increasingly focused, but the surrounding environment of construction projects is more and more complex, and the space for supporting deep foundation pit is smaller and smaller, so that the selection of the deep foundation pit supporting form is limited, and in many cases, pile-arranging supporting can only be selected, but the pile anchor system is difficult to realize due to the increase of the depth of the foundation pit, the complexity of stratum and the influence of surrounding built structures, or in the foundation pit reinforcement emergency schemes for treating deformation, collapse and the like of the foundation pit, the supporting mode of 'pile arranging and diagonal bracing' is usually adopted at the moment to improve the reliability of the supporting system.
The foundation pit inclined support supporting system is a complex project, and at present, the conventional mode is to transmit axial pressure of an inclined support to a peripheral stable soil body and a member by arranging vertical support piles at the bottom of a foundation pit and the like, so that stability and safety of the foundation pit are ensured. Through, after the foundation pit is excavated to a certain elevation, the inclined support supporting system is used for pouring the concrete base or driving in the vertical support pile, one end of the steel pipe is directly poured into the concrete base, the other end of the steel pipe supports the foundation pit supporting structure, and the steel pipe is integrally and obliquely arranged to form an inclined support.
In the scheme, on one hand, the concrete pouring and setting time is long, on the other hand, the foundation pit is excavated in a large area in advance, and after the foundation pit is excavated to a certain elevation, the cross construction is carried out, so that the whole construction period is longer, and after the concrete is set, the difficulty is caused for subsequent concrete shoveling. Therefore, it is desirable to provide a foundation pit diagonal bracing support system that effectively shortens the construction period.
Disclosure of Invention
The utility model aims to solve the technical problems that: in order to overcome the defects in the prior art, the foundation pit inclined support supporting structure is provided, so that on one hand, the strength of an inclined support can be improved, on the other hand, the construction period can be effectively shortened, and the foundation pit inclined support supporting structure has wide application prospect and certain economic and social effects.
The technical scheme adopted for solving the technical problems is as follows: a supporting structure of foundation pit inclined support comprises a crown beam, a prefabricated steel pipe supporting piece, a special-shaped supporting head and a supporting body,
the crown beam is fixed at the top of the foundation pit guard pile,
the upper end of the prefabricated steel pipe support piece is fixedly connected with the crown beam, the lower end of the prefabricated steel pipe support piece is connected with the special-shaped support head, a through hole for forming a conduit is reserved in the prefabricated steel pipe support piece,
the special-shaped support head is provided with a connecting port and a reserved orifice which are mutually communicated, the connecting port is positioned at the joint of the special-shaped support head and the prefabricated steel pipe support piece and is communicated with the guide pipe, the reserved orifice is positioned at the side surface of the special-shaped support head,
the supporting body is formed by grouting body overflowed from the reserved hole and is used for fixing the lower end of the prefabricated steel pipe supporting piece and soil body.
Further, the special-shaped supporting head comprises a cylinder and a cone with the same bottom surface, the bottom surfaces of the cylinder and the cone are connected to form an integrated structure,
the side area of the special-shaped supporting head comprises the side area of a cylinder and the side area of a cone,
the side of the cylinder is provided with external threads, a transverse ring groove, an oblique slot or a vertical slot.
Further, reserved holes which are uniformly distributed are formed in the transverse annular groove, the oblique slotting or the vertical slotting of the cylinder of the special-shaped support head and the cone.
Further, the total area of the reserved holes on the side surface of the special-shaped supporting head is 10-30% of the side area of the special-shaped supporting head, and the diameter of the reserved holes is 10-20mm.
Further, a filter screen for filtering soil bodies is arranged in the reserved hole.
Further, the joint of the prefabricated steel pipe support piece and the crown beam is provided with a bracket-shaped reinforcing member.
Further, the included angle between the prefabricated steel pipe support piece and the foundation pit guard pile, namely the inclination angle of the prefabricated steel pipe support piece, is 45-60 degrees.
Further, the number of the conduits is at least 1.
The beneficial effects of the utility model are as follows: the prefabricated steel pipe support is a prefabricated member under the condition of non-advanced excavation, the construction period is greatly shortened, and the prefabricated steel pipe support has good bearing capacity of bearing the shaft center in compression, bending and shearing, so that the safety of foundation pit support is improved; the method is applicable to different types of diagonal bracing supporting systems and deep foundation pits with different depths, and can be applicable to different geological conditions; vacuum pumping is adopted to solidify the bad soil layer, and water obtained by vacuum is stirred with the grouting base material, so that the effects of water saving and environmental protection are achieved; the construction is convenient, safe and reliable, and the cost can be effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of the structure of the prefabricated steel tube support of the present utility model;
fig. 3 to 6 are schematic structural views of the special-shaped supporting head of the present utility model.
Reference numerals in the drawings: the foundation pit is characterized by comprising the following components of a 1-crown beam, a 2-foundation pit fender post, a 3-prefabricated steel pipe support piece, a 4-special-shaped support head, a 41-connection port, a 5-bearing body, a 6-conduit, a 7-reserved orifice, an 8-reinforcement and a 9-foundation pit excavation surface.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The foundation pit inclined support supporting structure shown in figures 1-2 comprises a crown beam 1, a prefabricated steel pipe supporting piece 3, a special-shaped supporting head 4 and a supporting body 5,
the crown beam 1 is fixed on top of the foundation pit fender post 2,
the upper end of the prefabricated steel pipe support 3 is fixedly connected with the crown beam 1, the lower end of the prefabricated steel pipe support 3 is connected with the special-shaped support head 4, a through hole for forming a conduit 6 is reserved in the prefabricated steel pipe support 3, the lower end of the prefabricated steel pipe support 3 is connected with the special-shaped support head 4 through a welding method, a flange connection method and the like,
the special-shaped support head 4 is provided with a connecting port 41 and a reserved orifice 7 which are mutually communicated, the connecting port 41 is positioned at the joint of the special-shaped support head 4 and the prefabricated steel pipe support piece 3 and is communicated with the guide pipe 6, the reserved orifice 7 is positioned at the side surface of the special-shaped support head 4,
the carrier 5 is formed by grouting body overflowed from the reserved hole 7 and is used for fixing the lower end of the prefabricated steel pipe support 3 and soil body.
The special-shaped supporting head 4 comprises a cylinder and a cone with the same bottom surface, the bottom surfaces of the cylinder and the cone are connected to form an integrated structure,
the side area of the special-shaped supporting head 4 comprises the side area of a cylinder and the side area of a cone,
as shown in fig. 3-6, the side surface of the cylinder is provided with external threads, a transverse ring groove, an oblique slot or a vertical slot.
The cylinder of the special-shaped support head 4 is provided with reserved holes 7 which are uniformly distributed in a transverse annular groove, an oblique slot or a vertical slot.
The total area of the reserved orifice 7 on the side surface of the special-shaped supporting head 4 is 10-30% of the side area of the special-shaped supporting head 4, so that the grouting requirement can be met; the diameter of the reserved orifice 7 is 10-20mm, so that vacuum pumping can be effectively performed.
The filter screen for filtering the soil body is arranged in the reserved orifice 7, so that the soil body can be effectively prevented from entering in the implantation process and the vacuum pumping consolidation process of the special-shaped support head 4, and an effective supporting body is formed.
The joint of the prefabricated steel pipe support 3 and the crown beam 1 is provided with a bracket-shaped reinforcement 8.
The angle between the prefabricated steel pipe support 3 and the foundation pit guard pile 2, namely the inclination angle of the prefabricated steel pipe support 3 is 45-60 degrees, the angle can better perform construction operation, and can bear larger axial pressure.
The number of the ducts 6 is 1.
When the foundation pit inclined support supporting structure is constructed, the method comprises the following steps:
(1) Preparation before construction: consulting underground pipeline distribution data of underground and surrounding structures of a building, and performing on-site investigation and environment investigation; combining engineering experience, determining construction process and equipment, and compiling a construction scheme; performing performance and operation safety inspection on main construction machinery and matched equipment; witness checking is carried out on the incoming prefabricated steel pipe support 3; test construction is carried out, and design parameters are adjusted according to construction results;
(2) Leveling equipment, and ensuring the accuracy of the angle of 45-60 degrees of the excavation face 9 of the foundation pit implanted with the prefabricated steel pipe support 3;
(3) The prefabricated steel pipe support 3 can be implanted by adopting various power or static implantation modes such as hammering, vibration, hydraulic pressure and the like, and can also be introduced by adopting modes such as hole guiding, rotation and the like;
(4) Determining the length of the prefabricated steel pipe support 3 according to design requirements, and preferentially selecting a single-section prefabricated steel pipe support 3;
(5) When soil layers at the bearing bodies 5 are cohesive soil, silty soil, sand, crushed stones, residual soil and the like, after the prefabricated steel pipe support 3 is implanted into the soil, a conduit 6 formed by reserving through holes through the prefabricated steel pipe support 3 is injected into the slurry, and overflows from reserved holes 7 of the special-shaped support heads 4 of the prefabricated steel pipe support 3 to form a grouting body, so that the bearing capacity of the end part is increased;
when the soil layer at the bearing body 5 is a soft soil layer such as silt, after the prefabricated steel pipe support 3 is planted in the soil, the top of the prefabricated steel pipe support 3 is sealed and a vacuum pump is adopted for test air suction, whether air leakage exists or not is checked, the air suction is started after the air leakage exists or not is confirmed, the vacuum degree in the guide pipe 6 is measured and read once every 2 hours, when the vacuum pressure reaches the requirement and changes less, the vacuum degree in the guide pipe 6 can be adjusted every 4 hours-6 hours when needed, the vacuum degree in the guide pipe 6 reaches 90kPa or more, the pressure difference is formed between the inside and the outside of the prefabricated steel pipe support 3, so that pore water flows in when the special-shaped support head 4 is inserted into the soil body, a water gauge is placed in the guide pipe 6 of the prefabricated steel pipe support 3, so that the water pressure can be measured, the water existence (according to the design and bearing requirement of the pile) can be known, the pore water pressure of the surrounding soil body is reduced, and the effective force is increased, and the bearing capacity of the soil body is increased; when the soil body meets the requirement of bearing capacity, stirring the grouting base material and water in the prefabricated steel pipe support piece 3, and injecting the slurry after the grouting requirement of the slurry is met, wherein the method can effectively improve the bearing capacity of the weak soil layer and save water consumption;
(6) The prefabricated steel pipe support 3 is connected with the crown beam 1 at the top of the foundation pit guard pile 2, and the crown beam is made into a bracket-shaped reinforcement to achieve the reinforcement effect.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (8)
1. The utility model provides a foundation ditch bearing support supporting construction which characterized in that: comprises a crown beam (1), a prefabricated steel pipe supporting piece (3), a supporting head and a supporting body (5),
the crown beam (1) is fixed at the top of the foundation pit guard pile (2),
the upper end of the prefabricated steel pipe support (3) is fixedly connected with the crown beam (1), the lower end of the prefabricated steel pipe support is connected with the support head, a through hole for forming the guide pipe (6) is reserved in the prefabricated steel pipe support (3),
the support head is provided with a connecting port (41) and a reserved orifice (7) which are communicated with each other, the connecting port (41) is positioned at the joint of the support head and the prefabricated steel pipe support piece (3) and is communicated with the guide pipe (6), the reserved orifice (7) is positioned at the side surface of the support head,
the supporting body (5) is formed by grouting body overflowed from the reserved hole (7) and is used for fixing the lower end of the prefabricated steel pipe supporting piece (3) and soil body.
2. The foundation pit diagonal bracing support structure according to claim 1, wherein: the supporting head comprises a cylinder and a cone with the same bottom surface, the bottom surfaces of the cylinder and the cone are connected to form an integrated structure,
the lateral area of the support head comprises the lateral area of a cylinder and the lateral area of a cone,
the side of the cylinder is provided with external threads, a transverse ring groove, an oblique slot or a vertical slot.
3. The foundation pit diagonal bracing support structure according to claim 2, wherein: the cylinder of the supporting head is provided with reserved holes (7) which are uniformly distributed in the transverse annular groove, the oblique slotting or the vertical slotting.
4. The foundation pit diagonal bracing support structure according to claim 2, wherein: the total area of the reserved holes (7) on the side surface of the supporting head is 10-30% of the area of the side surface of the supporting head, and the diameter of the reserved holes (7) is 10-20mm.
5. The foundation pit diagonal bracing support structure according to claim 1, wherein: a filter screen for filtering soil bodies is arranged in the reserved orifice (7).
6. The foundation pit diagonal bracing support structure according to claim 1, wherein: the joint of the prefabricated steel pipe support piece (3) and the crown beam (1) is provided with a bracket-shaped reinforcing piece (8).
7. The foundation pit diagonal bracing support structure according to claim 1, wherein: the included angle between the prefabricated steel pipe support piece (3) and the foundation pit guard pile (2), namely the inclination angle of the prefabricated steel pipe support piece (3), is 45-60 degrees.
8. The foundation pit diagonal bracing support structure according to claim 1, wherein: the number of said ducts (6) is at least 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223414075.3U CN219011237U (en) | 2022-12-20 | 2022-12-20 | Foundation pit inclined support supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223414075.3U CN219011237U (en) | 2022-12-20 | 2022-12-20 | Foundation pit inclined support supporting structure |
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| Publication Number | Publication Date |
|---|---|
| CN219011237U true CN219011237U (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223414075.3U Active CN219011237U (en) | 2022-12-20 | 2022-12-20 | Foundation pit inclined support supporting structure |
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| CN (1) | CN219011237U (en) |
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- 2022-12-20 CN CN202223414075.3U patent/CN219011237U/en active Active
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