CN112942363A - Deep basal pit prestressing force steel braced system - Google Patents
Deep basal pit prestressing force steel braced system Download PDFInfo
- Publication number
- CN112942363A CN112942363A CN202110126550.8A CN202110126550A CN112942363A CN 112942363 A CN112942363 A CN 112942363A CN 202110126550 A CN202110126550 A CN 202110126550A CN 112942363 A CN112942363 A CN 112942363A
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- Prior art keywords
- pull rod
- foundation pit
- spherical
- cable
- structural beam
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention provides a prestressed steel supporting system for a deep foundation pit, which belongs to the technical field of foundation pit supporting systems and comprises a plurality of prestressed beams which are arranged on the inner side of a structural beam and are circumferentially distributed at intervals. The embodiment of the invention is different from the traditional anchoring form, and through the arrangement of the embedded part and the tensioner, the prestress is applied to the pull rod, so that the embodiment of the invention can be used for reinforcing and supporting the structural beam, thereby balancing the external pressure of the foundation pit and improving the supporting stability of the foundation pit; through the arrangement of the protection tube shell and the spherical clamp, the assembly process of the pull rod can be simplified, the installation efficiency is improved, after the pull rod is subjected to prestress, the pull rod can move in the protection tube shell in an adaptive manner, the pull rod and the connecting beam are prevented from being damaged due to rigid contact between the pull rod and the connecting beam, and the service life is further prolonged; in addition, the prestressed beam provided by the embodiment of the invention can be repeatedly used, and has the advantages of safety, energy conservation, environmental protection and the like.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting systems, and particularly relates to a deep foundation pit prestressed steel supporting system.
Background
In order to ensure the safety of the construction of the underground structure and the surrounding environment of the foundation pit, the side wall and the surrounding environment of the foundation pit need to be supported, reinforced and protected. In deep foundation pit engineering of high-rise buildings and subways, because excavation is carried out in cities, various structures such as traffic main roads, built buildings or pipelines and the like usually exist around foundation pits, which relates to an important content of excavation of the foundation pits and protects the safety of the structures around the foundation pits.
In the prior art, two ends of a pull rod are generally passed through a concrete beam for anchoring, then a support rod in a prestressed beam is jacked and extended to realize pressurization so as to complete supporting and reinforcing of the concrete beam, and prestress is indirectly applied to the pull rod in a prestress application mode, so that the whole system is complex in force transfer, inconvenient to operate and low in installation efficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the embodiment of the invention is to provide a prestressed steel supporting system for a deep foundation pit.
In order to solve the technical problems, the invention provides the following technical scheme:
a deep foundation pit prestress steel supporting system comprises a plurality of prestress beams which are arranged on the inner side of a structural beam and are distributed at intervals in the circumferential direction;
the prestressed beam comprises a plurality of connecting beams fixedly arranged on the inner side of the structural beam and a pull rod movably connected to one end of the connecting beam far away from the structural beam through a cable joint node;
the stay cable joint node comprises a protection pipe shell fixedly arranged at one end of the connecting beam far away from the structural beam, and a spherical clamping part used for supporting the pull rod is arranged on the inner side of the protection pipe shell;
the two ends of the pull rod are connected with the structural beam through stay cable end joints;
the stay cable end node comprises a stay cable joint fixedly connected with the end part of the pull rod, a tensioner arranged at one end of the stay cable joint far away from the pull rod, an ear plate hinged to one end of the tensioner far away from the stay cable joint, and an embedded part embedded in the structural beam and fixedly connected with the ear plate;
the bottom of the pull rod is fixedly provided with a support frame.
As a further improvement of the invention: and a stiffening plate for supporting the spherical clamping part is further arranged in the protection pipe shell.
As a further improvement of the invention: the stiffening plate is of a cross structure, and an arc-shaped surface matched with the spherical clamping part is arranged on one side of the stiffening plate.
As a further improvement of the invention: the spherical clamping part comprises an upper spherical cable clamp and a lower spherical cable clamp, the upper spherical cable clamp is movably arranged in the protective tube shell, the lower spherical cable clamp is connected with the upper spherical cable clamp, first clamping grooves matched with the pull rods are formed in the inner sides of the upper spherical cable clamp and the lower spherical cable clamp, and second clamping grooves for the pull rods to move are formed in the side wall of the protective tube shell.
As a still further improvement of the invention: the upper spherical cable clamp and the lower spherical cable clamp are connected through bolts and nuts.
Compared with the prior art, the invention has the beneficial effects that:
1. the prestressed beam provided by the embodiment of the invention can be repeatedly used, and has the advantages of safety, energy conservation, environmental protection and the like;
2. the embodiment of the invention is different from the traditional anchoring form, and through the arrangement of the embedded part and the tensioner, the prestress is applied to the pull rod, so that the embodiment of the invention can be used for reinforcing and supporting the structural beam, thereby balancing the external pressure of the foundation pit and improving the supporting stability of the foundation pit;
3. according to the embodiment of the invention, through the arrangement of the protection pipe shell and the spherical clamp, the assembly process of the pull rod can be simplified, the installation efficiency is improved, after the pull rod is subjected to prestress, the pull rod can move in the protection pipe shell in an adaptive manner, the pull rod and the connecting beam are prevented from being damaged due to rigid contact between the pull rod and the connecting beam, and the service life is further prolonged;
4. the embodiment of the invention is assembled by multiple components, so that the field construction steps can be greatly reduced, and the installation period is saved;
5. the embodiment of the invention solves the problem that the conventional steel support system needs to arrange a vertical bearing member, namely a vertical column or a vertical column pile in a foundation pit;
6. the embodiment of the invention saves the cost of raw materials such as cement, concrete, steel bars and the like adopted for constructing the upright posts or the upright post piles;
7. after the embodiment of the invention utilizes the tensioner to apply prestress, the self weight can be overcome, and self balance is realized.
Drawings
FIG. 1 is a schematic view of a knot installation of a deep foundation pit prestressed steel supporting system;
FIG. 2 is a schematic structural diagram of a deep foundation pit prestressed steel supporting system;
FIG. 3 is a schematic structural diagram of a stay cable joint node in a deep foundation pit prestressed steel supporting system;
FIG. 4 is an exploded view of a joint node of a guy cable in a prestressed steel bracing system for a deep foundation pit;
FIG. 5 is a schematic structural diagram of a guyed end joint in a deep foundation pit prestressed steel bracing system;
FIG. 6 is a schematic structural diagram of a support frame in a deep foundation pit prestressed steel support system;
in the figure: 1-prestressed beam, 2-cable joint node, 21-pipe shell seal, 22-nut, 23-lower spherical cable clamp, 24-pull rod, 25-upper spherical cable clamp, 26-bolt, 27-stiffening plate, 28-protective pipe shell, 3-cable end node, 31-cable joint, 32-tensioner, 33-ear plate, 34-embedded part, 4-linking beam and 5-support frame.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1-6, the embodiment provides a prestressed steel supporting system for a deep foundation pit, including a plurality of prestressed beams 1 installed inside a structural beam and circumferentially distributed at intervals, where the prestressed beams 1 include a plurality of connection beams 4 fixedly disposed inside the structural beam and a pull rod 24 movably connected to one end of the connection beam 4 away from the structural beam through a cable joint node 2, specifically, the cable joint node 2 includes a protection pipe shell 28 fixedly disposed at one end of the connection beam 4 away from the structural beam, and a spherical clamping portion for supporting the pull rod 24 is disposed inside the protection pipe shell 28; the two ends of the pull rod 24 are connected with the structural beam through a cable end node 3, specifically, the cable end node 3 comprises a cable joint 31 fixedly connected with the end of the pull rod 24, a tensioner 32 arranged at one end of the cable joint 31 far away from the pull rod 24, an ear plate 33 hinged to one end of the tensioner 32 far away from the cable joint 31, and an embedded part 34 embedded in the structural beam and fixedly connected with the ear plate 33; the bottom of the pull rod 24 is fixedly provided with a support frame 5.
The connection of the whole pull rod 24 and the structural beam is realized through the embedded part 34 and the lug plate 33, the pull rod 24 is prestressed by the tensioner 32, the pull rod 24 is stressed to drive the connecting beam 4 to be tightly abutted against the structural beam, and therefore support is provided for the structural beam so as to balance the pressure of the foundation pit.
Further, a stiffening plate 27 for supporting the spherical clamping part is arranged inside the protection pipe shell 28.
Specifically, the stiffening plate 27 is of a cross structure, and an arc-shaped surface matched with the spherical clamping is arranged on one side of the stiffening plate 27.
Specifically, the spherical clamp includes an upper spherical cable clamp 25 movably disposed inside the protection tube shell 28 and a lower spherical cable clamp 23 connected to the upper spherical cable clamp 25, the inner sides of the upper spherical cable clamp 25 and the lower spherical cable clamp 23 are both provided with a first clamping groove adapted to the pull rod 24, and the side wall of the protection tube shell 28 is provided with a second clamping groove for the pull rod 24 to move.
When the tensioner 32 is adjusted to prestress the pull rod 24, the pull rod 24 is forced to rotate the upper spherical clamp 25 and the lower spherical clamp 23 adaptively inside the protective shell 28, and the pull rod 24 can move adaptively along the second slot.
Specifically, the upper spherical cable clamp 25 and the lower spherical cable clamp 23 are connected by a bolt 26 and a nut 22.
With the increase of the excavation depth of the foundation pit, the number of the prestressed girders 1 can be increased at appropriate positions of the lower layer of the inner side of the structural girder to further enhance the stability of the structural girder.
In another embodiment, a cartridge seal 21 is fixedly disposed on an end of the protective cartridge 28 remote from the tie beam 4.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (5)
1. A deep foundation pit prestress steel supporting system is characterized by comprising a plurality of prestress beams (1) which are arranged on the inner side of a structural beam and are distributed at intervals in the circumferential direction;
the prestressed beam (1) comprises a plurality of connecting beams (4) fixedly arranged on the inner side of the structural beam and a pull rod (24) movably connected to one end, far away from the structural beam, of the connecting beam (4) through a cable joint node (2);
the inhaul cable joint node (2) comprises a protection pipe shell (28) fixedly arranged at one end, far away from the structural beam, of the connecting beam (4), and a spherical clamping part used for supporting the pull rod (24) is arranged on the inner side of the protection pipe shell (28);
the two ends of the pull rod (24) are connected with the structural beam through stay cable end joints (3);
the cable end node (3) comprises a cable joint (31) fixedly connected with the end part of the pull rod (24), a tensioner (32) arranged at one end, far away from the pull rod (24), of the cable joint (31), an ear plate (33) hinged to one end, far away from the cable joint (31), of the tensioner (32) and an embedded part (34) embedded in the structural beam and fixedly connected with the ear plate (33);
the bottom of the pull rod (24) is fixedly provided with a support frame (5).
2. The deep foundation pit prestressed steel supporting system according to claim 1, wherein a stiffening plate (27) for supporting the spherical clamping portion is further arranged inside the protecting pipe shell (28).
3. The deep foundation pit prestressed steel supporting system according to claim 2, wherein the stiffening plate (27) is of a cross structure, and one side of the stiffening plate (27) is provided with an arc-shaped surface matched with the spherical clamping part.
4. The deep foundation pit prestressed steel supporting system according to any one of claims 1-3, wherein the spherical clamping portion comprises an upper spherical cable clamp (25) movably arranged inside the protecting pipe shell (28) and a lower spherical cable clamp (23) connected with the upper spherical cable clamp (25), the inner sides of the upper spherical cable clamp (25) and the lower spherical cable clamp (23) are respectively provided with a first clamping groove matched with the pull rod (24), and the side wall of the protecting pipe shell (28) is provided with a second clamping groove for the pull rod (24) to move.
5. The deep foundation pit prestressed steel supporting system according to claim 4, wherein the upper spherical cable clamp (25) and the lower spherical cable clamp (23) are connected through a bolt (26) and a nut (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110126550.8A CN112942363A (en) | 2021-01-29 | 2021-01-29 | Deep basal pit prestressing force steel braced system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110126550.8A CN112942363A (en) | 2021-01-29 | 2021-01-29 | Deep basal pit prestressing force steel braced system |
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| Publication Number | Publication Date |
|---|---|
| CN112942363A true CN112942363A (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110126550.8A Pending CN112942363A (en) | 2021-01-29 | 2021-01-29 | Deep basal pit prestressing force steel braced system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926494A (en) * | 2012-11-20 | 2013-02-13 | 天津大学 | Radial spherical plain cable-strut system for suspended dome structure |
| CN203284964U (en) * | 2013-04-23 | 2013-11-13 | 河南杭萧钢构有限公司 | Steel-structured pull rod |
| CN204781361U (en) * | 2015-06-24 | 2015-11-18 | 浙江东南网架股份有限公司 | Alternately open last quarter node fastener of string truss structure |
| CN107254917A (en) * | 2017-07-11 | 2017-10-17 | 浙江东南网架股份有限公司 | A kind of many order prestressed steel truss structures of super-span and its construction method |
| CN112160326A (en) * | 2020-09-18 | 2021-01-01 | 上海巨鲲科技有限公司 | Truss string concrete combined supporting system |
-
2021
- 2021-01-29 CN CN202110126550.8A patent/CN112942363A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926494A (en) * | 2012-11-20 | 2013-02-13 | 天津大学 | Radial spherical plain cable-strut system for suspended dome structure |
| CN203284964U (en) * | 2013-04-23 | 2013-11-13 | 河南杭萧钢构有限公司 | Steel-structured pull rod |
| CN204781361U (en) * | 2015-06-24 | 2015-11-18 | 浙江东南网架股份有限公司 | Alternately open last quarter node fastener of string truss structure |
| CN107254917A (en) * | 2017-07-11 | 2017-10-17 | 浙江东南网架股份有限公司 | A kind of many order prestressed steel truss structures of super-span and its construction method |
| CN112160326A (en) * | 2020-09-18 | 2021-01-01 | 上海巨鲲科技有限公司 | Truss string concrete combined supporting system |
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Application publication date: 20210611 |
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| RJ01 | Rejection of invention patent application after publication |