CN112030985A - Hollow steel pipe concrete support, prefabricated member, construction method and support system - Google Patents

Hollow steel pipe concrete support, prefabricated member, construction method and support system Download PDF

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Publication number
CN112030985A
CN112030985A CN202010760090.XA CN202010760090A CN112030985A CN 112030985 A CN112030985 A CN 112030985A CN 202010760090 A CN202010760090 A CN 202010760090A CN 112030985 A CN112030985 A CN 112030985A
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CN
China
Prior art keywords
steel
joint
concrete
hollow
pipe
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Pending
Application number
CN202010760090.XA
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Chinese (zh)
Inventor
欧阳冬
张建明
王华兵
熊朝辉
林作忠
雷崇
徐军林
罗会平
刘国宝
董俊
王永伟
李成亮
刘习超
邰家醉
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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Application filed by China Railway Siyuan Survey and Design Group Co Ltd filed Critical China Railway Siyuan Survey and Design Group Co Ltd
Priority to CN202010760090.XA priority Critical patent/CN112030985A/en
Publication of CN112030985A publication Critical patent/CN112030985A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention belongs to the technical field of foundation pit engineering, and particularly relates to a hollow steel tube concrete support prefabricated part and a construction method thereof, wherein the hollow steel tube concrete support prefabricated part comprises a steel tube and a joint steel plate, concrete is filled in the steel tube, and a hollow part which penetrates through the concrete along the axial direction is arranged in the concrete; a steel reinforcement framework is arranged in the concrete; two ends of the steel pipe are welded with annular joint steel plates, the inner sides of the joint steel plates are connected with the steel reinforcement framework, and the outer sides of the joint steel plates are positioned outside the steel pipe; the invention also provides a hollow steel tube concrete support which is formed by connecting and assembling a plurality of hollow steel tube concrete support prefabricated parts through bolts; the invention also provides a supporting system which comprises an envelope structure, a crown beam, a waist beam and the hollow steel pipe concrete support; the hollow steel pipe concrete supports are supported between the two opposite sides of the crown beam and between the two opposite sides of the waist beam. The invention can improve the bearing capacity, the anti-deformation capacity, the integrity and the middle node strength of the hollow steel tube concrete support.

Description

Hollow steel pipe concrete support, prefabricated member, construction method and support system
Technical Field
The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a hollow steel tube concrete support, a prefabricated member, a construction method and a support system.
Background
Traditional cast in situ concrete supports, because of its rigidity is big, the wholeness is good, advantages such as safe and reliable, generally apply to underground works, nevertheless also have outstanding problem and shortcoming: (1) cost, high investment: concrete support belongs to temporary engineering, a main body of a station structure is finished, namely outward transportation is broken, the investment of temporary waste engineering is high, generally, underground stations are millions, complex stations are tens of millions, and the cost of complex stations is tens of millions; (2) time-consuming and long construction period: supporting a formwork by concrete, binding reinforcing steel bars, pouring and vibrating, maintaining and removing at the later stage, wherein the whole process is long for several months, and the site construction progress is seriously restricted; (3) hard, the degree of difficulty is big: the concrete support construction difficulty is high, and a large amount of manpower and material resources are consumed to break the construction after the use; (4) the concrete is not environment-friendly, the waste residues of the concrete are broken to pollute the environment, and the development direction of green construction, environmental protection and energy conservation is not met. Therefore, advanced products and scientific construction methods are urgently needed to replace the traditional concrete support.
Although traditional steel pipe props can retrieve, it is comparatively convenient to be under construction, but can only bear pressure between its and foundation ditch retaining structure, and the wholeness is relatively poor, and resistance to deformation ability is poor, becomes the weak link of foundation ditch safety.
At present, the existing prefabricated support has many weak links at the connecting nodes, and the nodes can not realize rigid connection, so that the overall stability of the foundation pit is insufficient.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a hollow steel tube concrete support, a prefabricated member, a construction method and a support system, which can improve the bearing capacity, the deformation resistance, the integrity and the middle node strength of the hollow steel tube concrete support.
In order to achieve the purpose, the technical scheme of the invention is that the hollow steel tube concrete support prefabricated part comprises a steel tube and a joint steel plate, wherein concrete is filled in the steel tube, and a hollow part which penetrates through the concrete along the axial direction is arranged in the concrete; a steel reinforcement framework is arranged in the concrete; annular joint steel plates are welded at two ends of the steel pipe, the inner sides of the joint steel plates are connected with the steel reinforcement framework, and the outer sides of the joint steel plates are located outside the steel pipe.
Furthermore, the inner side and the outer side of the two ends of the steel pipe are respectively provided with a joint inner lining pipe and a joint outer lining pipe, and the joint inner lining pipe and the joint outer lining pipe are welded with the joint steel plate.
Furthermore, the part of the joint steel plate extending out of the steel pipe is connected with the joint outer liner pipe through a stiffening plate.
Further, the inner sides of the two ends of the concrete are provided with inner wrapping pipes, and the inner wrapping pipes are welded with the joint steel plates.
Furthermore, a circle of meshing teeth are arranged on the outer wall of one end, away from the joint steel plate, of the inner wrapping pipe and embedded into the concrete.
Further, the steel reinforcement framework comprises a spiral stirrup and a plurality of longitudinal bars, and the plurality of longitudinal bars are arranged at intervals on the inner side of the spiral stirrup and are connected with the spiral stirrup.
Furthermore, a plurality of studs are welded on the inner wall of the steel pipe, and the studs are embedded in the concrete.
The invention also provides a construction method of the hollow steel tube concrete support prefabricated member, which comprises the following steps:
s1, preparing a steel pipe, a joint steel plate, a spiral stirrup, a longitudinal bar, a stiffening plate, a joint inner lining pipe, a joint outer lining pipe and an inner wrapping pipe according to a design drawing;
s2, reserving studs on the inner wall of the steel pipe during manufacturing, and arranging spiral stirrups and longitudinal bars in the steel pipe;
s3, welding joint steel plates at two ends of the steel pipe respectively;
s4, welding a joint inner lining pipe and a joint outer lining pipe on the inner side and the outer side of the two ends of the steel pipe respectively, so that the joint inner lining pipe and the joint outer lining pipe are connected with the steel pipe and the joint steel plate together;
s5, connecting the joint steel plate with the longitudinal ribs through perforation plug welding;
s6, placing the inner tube with the outer wall provided with the meshing teeth in the spiral stirrup and welding the inner tube with the joint steel plate; welding the stiffening plate to enable one end of the stiffening plate to be welded on the joint outer liner pipe and one end of the stiffening plate to be welded on the joint steel plate;
and S7, filling concrete in the steel pipe and reserving the hollow part to finish the manufacture of the hollow steel pipe concrete support prefabricated member.
The invention also provides a hollow steel tube concrete support which is formed by splicing a plurality of hollow steel tube concrete support prefabricated parts or formed by splicing a plurality of hollow steel tube concrete support prefabricated parts manufactured by adopting the construction method; the joint steel plate extends to the part outside the steel pipe is provided with a plurality of bolt holes along the annular direction, and the adjacent corresponding bolt holes on the adjacent joint steel plate of the hollow concrete filled steel tube support prefabricated member are respectively connected through bolts.
The invention also provides a supporting system which comprises an envelope structure, a crown beam, a waist beam and a plurality of the hollow steel pipe concrete supports; the hollow concrete-filled steel tube support is characterized in that a crown beam is arranged at the top of the enclosure structure, a waist beam is arranged on the inner side of the enclosure structure, the hollow concrete-filled steel tube support is supported between two opposite sides of the crown beam, and the hollow concrete-filled steel tube support is supported between two opposite sides of the waist beam.
Compared with the prior art, the invention has the following beneficial effects:
(1) the hollow steel pipe concrete support prefabricated part is a hollow component with steel pipes filled with concrete, so that the component can be recycled conveniently, and the bearing capacity of the filled concrete can be obviously improved under the action of the hoop of the outer steel pipe, so that the hollow steel pipe concrete support has higher bearing capacity and stronger deformation resistance, and the engineering safety of a foundation pit is ensured;
(2) the hollow concrete-filled steel tube support prefabricated member adopts a hollow structure, so that the weight of a prefabricated member can be greatly reduced, the hollow concrete-filled steel tube support prefabricated member is convenient to transport and install, and the convenience of recycling is improved;
(3) the hollow steel pipe concrete support is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts, is convenient to construct, is convenient to install and disassemble, and is convenient for factory production and large-area popularization and application;
(4) the hollow steel pipe concrete support prefabricated part and the hollow steel pipe concrete support prefabricated part adopt rigid connection and equal strength design, so that the integrity, the rigidity and the bearing capacity similar to those of cast-in-place concrete support are achieved, and the safety of a foundation pit is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a floor plan view of a support system provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a hollow steel pipe concrete support preform provided in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a hollow steel pipe concrete support preform joint provided by an embodiment of the present invention;
FIG. 4 is a longitudinal sectional view of a hollow steel pipe concrete support preform joint according to an embodiment of the present invention;
in the figure: 1. the hollow steel tube concrete supports the prefab; 2. a crown beam; 3. an enclosure structure; 4. a steel pipe; 5. a stud; 6. concrete; 7. longitudinal ribs; 8. a spiral stirrup; 9. a hollow part; 10. a joint steel plate; 11. a bolt; 12. a stiffening plate; 13. an outer joint liner tube; 14. a joint liner tube; 15. an inner wrapping pipe; 16. engaging teeth; 17. and (5) plug welding the through holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example one
As shown in fig. 2 to 4, the present embodiment provides a hollow steel tube concrete support prefabricated member 1, including a steel tube 4 and a joint steel plate 10, where the steel tube 4 is filled with concrete 6, and a hollow portion 9 penetrating through the concrete 6 in an axial direction is provided in the concrete 6; a steel reinforcement framework is arranged in the concrete 6; annular joint steel plates 10 are welded at two ends of the steel pipe 4, the inner sides of the joint steel plates 10 are connected with the steel reinforcement framework, and the outer sides of the joint steel plates 10 are located outside the steel pipe 4. The hollow steel pipe concrete support prefabricated part 1 is a hollow component with a steel pipe 4 and concrete 6 filled in the steel pipe, the advantages of steel and concrete can be fully exerted, the cost performance is high, and the hollow steel pipe concrete support prefabricated part has obvious economic benefits compared with a pure steel support, has higher rigidity compared with a concrete size concrete support, and the steel pipe 4 is an outer skin of the prefabricated support, so that the concrete 6 filled in the hollow steel pipe concrete support can be protected from being damaged, the repeated recycling of the prefabricated component is realized, meanwhile, the bearing capacity of the concrete 6 filled in the hollow steel pipe concrete support can be obviously improved under the hoop effect of the steel pipe 4, the bearing capacity (strength) of the hollow steel pipe concrete support is high, the deformation resistance (rigidity) is high, the same or even higher strength and rigidity of a conventional concrete support can be achieved, and the safety of foundation pit engineering is. In addition, the steel reinforcement framework in the concrete 6 in the embodiment is connected with the joint steel plate 10, so that the integrity of the hollow steel tube concrete support prefabricated member 1 is further increased.
In the embodiment, the section of the steel pipe 4 can be circular, square, pentagonal, polygonal and the like, the thickness of the steel pipe 4 can be 8-20mm, the steel pipe 4 can be made of high-strength steel or alloy steel, the stress is met, and the steel pipe is easy to weld; the concrete 6 filled in the steel tube 4 can be ultra-high strength concrete, light high strength concrete, foam concrete and the like, but the strength requirement is required to be met, the weight is not too large, the thickness is small under the condition of meeting the supporting rigidity, and the self weight of the prefabricated part is reduced; the hollow part can be not provided with any inner wall, or can be in the form of the inner wall, the material of the inner wall can be steel pipes, PVC and the like, the section of the inner wall is not limited to be circular, and the inner wall can also be in various shapes such as square, polygon and the like; the joint steel plate 10 can be a circular or square flange, and the joint steel plate 10 and the steel pipe 4 can be prefabricated into a whole or can be welded into a whole after being prefabricated in a split mode.
Further, the inner side and the outer side of the two ends of the steel pipe 4 are respectively provided with a joint inner lining pipe 14 and a joint outer lining pipe 13, and both the joint inner lining pipe 14 and the joint outer lining pipe 13 are welded with the joint steel plate 10. As shown in fig. 3 and 4, a joint inner lining pipe 14 and a joint outer lining pipe 13 are respectively arranged on the inner side and the outer side of each end of the steel pipe 4 in the embodiment, and both the joint inner lining pipe 14 and the joint outer lining pipe 13 can be welded to the steel pipe 4 and the joint steel plate 10, so that a weak stress link at the joint of the joint steel plate 10 and the steel pipe 4 is eliminated; the joint inner lining pipe 14 and the joint outer lining pipe 13 are made of steel or alloy materials, the wall thickness is preferably 10-20mm, the length is preferably 0.5-1.0m, and the stress transition of the joint is met.
Further, the portion of the joint steel plate 10 extending out of the steel pipe 4 is connected to the joint outer liner 13 through a stiffener 12. As shown in fig. 3, in this embodiment, the connection rigidity between the joint steel plate 10 and the steel pipe 4 is increased by the stiffening plate 12, and the size and thickness of the stiffening plate 12 are controlled according to calculation and size requirements; as an embodiment, as shown in fig. 4, a plurality of stiffening plates 12 may be arranged at intervals circumferentially along the steel pipe 4, the thickness may be 10-20mm, the size is determined according to the stress, and the surplus is reserved.
Further, the inner sides of the two ends of the concrete 6 are respectively provided with an inner wrapping pipe 15, and the inner wrapping pipes 15 are welded with the joint steel plates 10. Furthermore, a circle of meshing teeth 16 are arranged on the outer wall of one end, away from the joint steel plate 10, of the inner wrapping pipe 15, and the meshing teeth 16 are embedded in the concrete 6. As shown in fig. 3 and 4, in the present embodiment, the inner cladding pipe 15 is welded to the joint steel plate 10 on the inner side of the concrete 6 to protect the end concrete; meanwhile, a circle of meshing teeth are arranged on the inner side of the inner wrapping pipe 15 to bite into the concrete 6, so that the integrity of the hollow steel pipe concrete support prefabricated part 1 is further improved. The wall thickness of the inner wrapping pipe 15 of the embodiment is preferably 8-15mm, the inward extending length is 0.3-0.5m, the material is steel or alloy material, but reliable welding with the joint steel plate 10 is required; 8-12 meshing teeth 16 are uniformly arranged along the circumferential direction, the meshing teeth 16 are square, the side length is 30-50mm, the thickness is the same as that of the inner packing tube 15, and the inner packing concrete 6 is recessed to realize the tight meshing of the meshing teeth and the inner packing concrete.
Further, the framework of steel reinforcement includes spiral stirrup 8 and many vertical bars 7, and many vertical bars 7 are followed spiral stirrup 8's inboard interval arrangement and all with spiral stirrup 8 is connected. As shown in fig. 2 and 4, in the concrete 6 of the present embodiment, the spiral stirrup 8 and the plurality of longitudinal bars 7 are arranged along the supporting direction, the spiral stirrup 8 is preferably made of first-grade steel with a diameter of 8-14mm, and the joint areas at both ends are encrypted at intervals; the longitudinal bars 7 are arranged close to the inner side, the diameter and the arrangement number of the longitudinal bars can be determined according to the actual situation, and the thickness of the internal concrete protective layer is preferably 50mm-80 mm; the end part of the longitudinal bar 7 is connected with the joint steel plate 10 through the perforation plug welding 17, the joint steel plate 10 is inwards concave and anchored into the concrete 6, the joint steel plate 10 and the concrete 6 are effectively integrated, and the connection strength and the rigidity of the joint steel plate 10 and the concrete filled steel tube are enhanced.
Furthermore, a plurality of studs 5 are welded on the inner wall of the steel pipe 4, and the studs 5 are embedded in the concrete 6. As shown in fig. 2, in this embodiment, the stud 5 may be welded on the surface of the steel strip before the steel pipe 4 is manufactured, and when the steel pipe 4 is manufactured, the stud 5 is located on the inner wall of the steel pipe 4, and the stud 5 is embedded in the concrete 6, so as to increase the reliable connection between the steel pipe 4 and the internal concrete 6; the number of the studs 5 is preferably 8-10 per circle, and the length is preferably 20-50 mm; optimally, an anchor head can be arranged at one end of the stud 5, which is far away from the inner wall of the steel tube 4, so that the tight connection effect between the concrete 6 and the steel tube 4 is enhanced.
In the embodiment, the steel pipe 4, the stud 5, the spiral stirrup 8 and the longitudinal bar 7 are tightly connected with the filling concrete 6 into a whole, so that the concrete-filled hollow steel pipe support prefabricated member is high in strength and rigidity and not easy to damage in the using process, and the concrete-filled hollow steel pipe support prefabricated member 1 can be recycled for multiple times.
Example two
As shown in fig. 2 to 4, the present embodiment provides a construction method of a hollow steel pipe concrete support preform 1, including the steps of:
s1, preparing a steel pipe 4, a joint steel plate 10, a spiral stirrup 8, a longitudinal bar 7, a stiffening plate, a joint inner lining pipe 14, a joint outer lining pipe 13 and an inner cladding pipe 15 according to a design drawing;
s2, reserving a stud 5 on the inner wall of the steel pipe 4 during manufacturing, and arranging a spiral stirrup 8 and a longitudinal rib 7 in the steel pipe 4;
s3, welding joint steel plates 10 at two ends of the steel pipe 4 respectively;
s4, welding a joint inner lining pipe 14 and a joint outer lining pipe 13 on the inner side and the outer side of each end of the steel pipe 4 respectively, and enabling the joint inner lining pipe 14 and the joint outer lining pipe 13 to be connected with the steel pipe 4 and the joint steel plate 10;
s5, connecting the joint steel plate 10 with the longitudinal ribs 7 through the perforation plug welding 17;
s6, placing the inner tube 15 with the outer wall provided with the meshing teeth 16 in the spiral stirrup 8 and welding the inner tube with the joint steel plate 10; welding a stiffening plate 12, so that one end of the stiffening plate is welded on the joint outer liner pipe 13, and the other end of the stiffening plate is welded on the joint steel plate 10;
and S7, filling concrete 6 in the steel pipe 4 and reserving the hollow part 9 to finish the manufacture of the hollow steel pipe concrete support prefabricated member 1.
In the method for manufacturing the hollow steel pipe concrete support prefabricated part 1, the joint steel plate 10 and the steel pipe 4 are directly prefabricated into a whole, as another embodiment, the joint steel plate 10 and the steel pipe 4 can be prefabricated separately and then connected into a whole, specifically, after the steel pipe 4 is manufactured, the spiral stirrup 8 and the longitudinal rib 7 are firstly configured in the steel pipe 4, then the joint inner lining pipe 14 and the joint outer lining pipe 13 are respectively welded on the inner side and the outer side of the two ends of the steel pipe 4, then the inner side of the end part of the joint inner lining pipe 14 is welded with the outer side of an annular steel plate, the annular steel plate is connected with the longitudinal rib 7 through the perforation plug welding 23, then the inner wrapping pipe 15 is welded on the inner side of the annular steel plate, then the steel pipe 4 is filled with concrete 6, and the hollow part 9 is reserved, and the prefabrication of; and finally, welding the joint inner lining pipe 14, the joint outer lining pipe 13, the steel pipe 4, the annular steel plate and the inner clad pipe 15 with the joint steel plate 10, welding the stiffening plate 12 to enable one end of the stiffening plate to be welded on the joint outer lining pipe 13 and the other end of the stiffening plate to be welded on the joint steel plate 10, and connecting the prefabricated steel pipe concrete part and the joint steel plate 10 into a whole to finish the manufacture of the hollow steel pipe concrete support prefabricated member 1.
In the embodiment, concrete 6 can be filled in the steel tube 4 by adopting a centrifugal process, so that an internal hollow can be automatically formed, the steel tube 4 can be used as an external template of the centrifugal process without being detached, and meanwhile, compared with the conventional cast-in-place vibration process, the centrifugal process is convenient for realizing high-strength concrete, and the hollow steel tube concrete has higher bearing capacity and deformation resistance and better durability; other processes may also be used to accomplish this.
EXAMPLE III
As shown in fig. 3, the present embodiment provides a hollow steel pipe concrete support, which is formed by splicing a plurality of hollow steel pipe concrete support prefabricated members 1 provided in the first embodiment, or by splicing a plurality of hollow steel pipe concrete support prefabricated members 1 manufactured by the construction method provided in the second embodiment; the part of the joint steel plate 10 extending out of the steel pipe 4 is provided with a plurality of bolt holes along the annular direction, and the adjacent corresponding bolt holes on the adjacent joint steel plate 10 of the hollow concrete-filled steel tube support prefabricated member 1 are respectively connected through bolts 11.
The hollow concrete filled steel tube of this embodiment supports 1 concatenation of prefab and forms that adopts a plurality of hollow concrete filled steel tube to support, adopts rigid connection and design of waiting strong between hollow concrete filled steel tube supports prefab 1 and the hollow concrete filled steel tube supports prefab 1, reaches and supports similar wholeness, rigidity and bearing capacity with cast in situ concrete, ensures foundation ditch safety, and the installation with dismantle the facility, be convenient for batch production preparation and large tracts of land popularization and application. The hollow steel pipe concrete support prefabricated part 1 can be provided with a plurality of fixed modulus sections with proper lengths according to needs, the hollow steel pipe concrete support prefabricated part is too long to be hoisted and constructed, and joints are too many and difficult to connect due to too short length; as an implementation mode, the middle-section prefabricated parts can be designed into standard modules with specifications of 4m, 5m, 6m and the like, the end-section prefabricated parts can be designed into standard modules with specifications of 2m, and hollow steel pipe concrete support prefabricated parts 1 with completely the same, incompletely the same or completely different length specifications are selected to be combined according to the actual foundation pit requirements, so that the requirements of foundation pit supports with different widths and lengths are met, and the universal applicability is realized. In addition, the concrete-filled steel tube support prefabricated member in the embodiment adopts a hollow structure, because concrete in the center of the steel tube has limited contribution to the bearing capacity, integrity and rigidity of the member, the removal of the concrete does not remarkably reduce the bearing capacity of the member, but can remarkably reduce the weight of the member, thereby facilitating the installation, transportation and disassembly.
The bolt 11 of the embodiment can be a high-strength bolt or a mechanical bolt, and the stress requirement can be met; as shown in fig. 3, in this embodiment, one row or multiple rows of bolt holes may be formed in the joint steel plate 10 along the circumferential direction, each row of bolt holes is multiple, corresponding bolt holes in adjacent joint steel plates 10 are all connected rigidly through bolts 11, and stiffening plates 12 are welded between every two rows of bolts 11, so as to ensure the rigid connection of the intermediate nodes, achieve equal-strength connection between the nodes and the members, ensure that the assembled support has similar or even higher strength and rigidity of the cast-in-place concrete support, and ensure the safety and stability of the foundation pit engineering.
The embodiment also provides the construction method of the hollow concrete-filled steel tube support, the hollow concrete-filled steel tube support prefabricated member 1 is transported to a construction site, the two hollow concrete-filled steel tube support prefabricated members 1 are aligned, the joint steel plates 10 adjacent to the two hollow concrete-filled steel tube support prefabricated members 1 are completely aligned, the bolts 11 are inserted into the corresponding bolt holes in the adjacent joint steel plates 10 and screwed, and the hollow concrete-filled steel tube support is spliced. Because outside steel pipe 4 has the effect of dado, so hollow steel pipe concrete support prefab 1 is difficult for receiving the damage, and adopts bolted connection between the hollow steel pipe concrete support prefab 1, realizes dismantling easily, consequently, finishes the back at foundation ditch engineering construction, can demolish the bolt between hollow steel pipe concrete support prefab 1, realizes the recovery of hollow steel pipe concrete support prefab 1, but cyclic utilization many times simultaneously, reduce cost.
Example four
As shown in fig. 1, the present embodiment further provides a support system, which includes a building envelope 3, a crown beam 2, a wale, and a plurality of hollow steel pipe concrete supports provided in the third embodiment; the top of the enclosure structure 3 is provided with a crown beam 2, the inner side of the enclosure structure 3 is provided with a waist beam, the hollow concrete-filled steel tube support is supported between two opposite sides of the crown beam 2, the hollow concrete-filled steel tube support is supported between two opposite sides of the waist beam, and the hollow concrete-filled steel tube support and the crown beam or the waist beam are rigidly connected.
The embodiment provides a rigid connection mode of a hollow steel tube concrete support and a crown beam, wherein a first U-shaped steel plate is fixed on the inner side of the crown beam 2, and a plurality of rows of long round bolt holes are formed in two opposite side plates on the first U-shaped steel plate; fixing a second U-shaped steel plate at the end part of the hollow steel pipe concrete support, and arranging a plurality of rows of long round bolt holes on two opposite side plates on the second U-shaped steel plate; the second U-shaped steel plate extends into the first U-shaped steel plate, and the long round bolt holes in the two side plates of the second U-shaped steel plate are connected with the long round bolt holes in the two side plates of the first U-shaped steel plate through bolts. In this embodiment, all set up multiseriate adjustable position's long round bolt hole on first U-shaped steel sheet and the second U-shaped steel sheet, and long round bolt hole all arranges along the direction of support, pass long round bolt hole through the bolt and connect first U-shaped steel sheet and second U-shaped steel sheet, can satisfy the rigid connection of tip node, wait the needs of strong connection, guarantee engineering safety, can adjust the relative position of long round bolt hole as required again simultaneously and change the length that connects, thereby eliminate the error in the construction.
Furthermore, a plurality of anchor bolts are pre-embedded in the crown beam 2, the anchor bolts are in place when the reinforcing steel bars are bound on the crown beam 2 and are reliably connected with the reinforcing steel bars in the crown beam 2, the anchor bolts are poured into the concrete of the crown beam 2, and the anchor bolts 17 need to have enough anchoring length in the crown beam 2; first U-shaped steel sheet adopts the wait strong welding on the end steel sheet, be equipped with a plurality of anchor bolt holes on the end steel sheet, the one end of crab-bolt stretches out and passes behind the crown beam 2 and correspond the anchor bolt hole to it is fixed through the nut, simple installation is convenient and connect reliably.
Furthermore, the outer wall of the first U-shaped steel plate is connected with the end steel plate through the stiffening plates, the connection rigidity of the first U-shaped steel plate and the end steel plate is increased, the stiffening plates can be arranged at intervals along the outer wall of the first U-shaped steel plate, the size and the thickness of the stiffening plates can be determined according to stress, and the surplus is reserved.
Further, the second U-shaped steel plate 21 may be welded to another end steel plate with equal strength, and the end steel plate is connected to the joint steel plate 10 through the bolt 11, so as to facilitate the detachment of the end node; the end steel plate is square or round.
Optimally, an end steel plate can be welded on the joint steel plate 10 at the end part of the hollow concrete-filled steel tube support, a second U-shaped steel plate is welded on the end steel plate, a jack is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate and the second U-shaped steel plate, two ends of the jack are respectively abutted against the end steel plates at two sides, and the jack is connected with a control system through a lead; in the use process of the hollow steel pipe concrete support, stress compensation is timely carried out when the stress relaxation phenomenon occurs, early warning is timely carried out when the stress is too large, and the problem that the whole foundation pit is damaged due to local instability of the foundation pit is avoided.
The embodiment also provides a rigid connection mode of hollow steel tube concrete support and waist rail, the waist rail adopts steel tube concrete structure, the welding of one side of the outer steel pipe of waist rail has the extension connecting steel plate, the extension connecting steel plate passes through the bolt and is connected with envelope, the welding of the opposite side of the outer steel pipe of waist rail has the waist rail connecting plate, hollow steel tube concrete support is used for the one end welding be connected with the waist rail to have hollow steel tube concrete support connecting plate, all be equipped with the long round bolt hole of arranging along the support direction on waist rail connecting plate and the hollow steel tube concrete support connecting plate, and pass the long round bolt hole through the bolt and be connected waist rail and hollow steel tube concrete support. Optimally, a jack can be arranged between the waist beam connecting plate and the hollow steel tube concrete supporting connecting plate, and the jack is connected with the control system through a lead for stress compensation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The utility model provides a hollow steel pipe concrete support prefab which characterized in that: the steel pipe joint comprises a steel pipe and a joint steel plate, wherein concrete is filled in the steel pipe, and a hollow part penetrating along the axial direction is formed in the concrete; a steel reinforcement framework is arranged in the concrete; annular joint steel plates are welded at two ends of the steel pipe, the inner sides of the joint steel plates are connected with the steel reinforcement framework, and the outer sides of the joint steel plates are located outside the steel pipe.
2. The hollow steel tube concrete support preform of claim 1, wherein: and the inner side and the outer side of the two ends of the steel pipe are respectively provided with a joint inner lining pipe and a joint outer lining pipe, and the joint inner lining pipe and the joint outer lining pipe are welded with the joint steel plate.
3. A hollow steel tube concrete support preform as claimed in claim 2, wherein: and the part of the joint steel plate extending out of the steel pipe is connected with the joint outer liner pipe through a stiffening plate.
4. The hollow steel tube concrete support preform of claim 1, wherein: and the inner sides of the two ends of the concrete are respectively provided with an inner wrapping pipe, and the inner wrapping pipes are welded with the joint steel plates.
5. The hollow steel tube concrete support preform of claim 4, wherein: and a circle of meshing teeth are arranged on the outer wall of one end, far away from the joint steel plate, of the inner wrapping pipe and are embedded into the concrete.
6. The hollow steel tube concrete support preform of claim 1, wherein: the steel bar framework comprises spiral stirrups and a plurality of longitudinal bars, and the plurality of longitudinal bars are arranged along the inner sides of the spiral stirrups at intervals and are connected with the spiral stirrups.
7. The hollow steel tube concrete support preform of claim 1, wherein: and a plurality of studs are welded on the inner wall of the steel pipe and embedded into the concrete.
8. The construction method of the hollow steel tube concrete support prefabricated member is characterized by comprising the following steps of:
s1, preparing a steel pipe, a joint steel plate, a spiral stirrup, a longitudinal bar, a stiffening plate, a joint inner lining pipe, a joint outer lining pipe and an inner wrapping pipe according to a design drawing;
s2, reserving studs on the inner wall of the steel pipe during manufacturing, and arranging spiral stirrups and longitudinal bars in the steel pipe;
s3, welding joint steel plates at two ends of the steel pipe respectively;
s4, welding a joint inner lining pipe and a joint outer lining pipe on the inner side and the outer side of the two ends of the steel pipe respectively, so that the joint inner lining pipe and the joint outer lining pipe are connected with the steel pipe and the joint steel plate together;
s5, connecting the joint steel plate with the longitudinal ribs through perforation plug welding;
s6, placing the inner tube with the outer wall provided with the meshing teeth in the spiral stirrup and welding the inner tube with the joint steel plate; welding the stiffening plate to enable one end of the stiffening plate to be welded on the joint outer liner pipe and one end of the stiffening plate to be welded on the joint steel plate;
and S7, filling concrete in the steel pipe and reserving the hollow part to finish the manufacture of the hollow steel pipe concrete support prefabricated member.
9. The utility model provides a hollow steel pipe concrete support which characterized in that: splicing a plurality of hollow steel pipe concrete support prefabricated members according to any one of claims 1 to 7 or splicing a plurality of hollow steel pipe concrete support prefabricated members manufactured by the construction method according to claim 8; the joint steel plate extends to the part outside the steel pipe is provided with a plurality of bolt holes along the annular direction, and the adjacent corresponding bolt holes on the adjacent joint steel plate of the hollow concrete filled steel tube support prefabricated member are respectively connected through bolts.
10. A support system, characterized by: comprising a building envelope, a crown beam, a wale, and a plurality of hollow steel pipe concrete supports according to claim 9; the hollow concrete-filled steel tube support is characterized in that a crown beam is arranged at the top of the enclosure structure, a waist beam is arranged on the inner side of the enclosure structure, the hollow concrete-filled steel tube support is supported between two opposite sides of the crown beam, and the hollow concrete-filled steel tube support is supported between two opposite sides of the waist beam.
CN202010760090.XA 2020-07-31 2020-07-31 Hollow steel pipe concrete support, prefabricated member, construction method and support system Pending CN112030985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010760090.XA CN112030985A (en) 2020-07-31 2020-07-31 Hollow steel pipe concrete support, prefabricated member, construction method and support system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010760090.XA CN112030985A (en) 2020-07-31 2020-07-31 Hollow steel pipe concrete support, prefabricated member, construction method and support system

Publications (1)

Publication Number Publication Date
CN112030985A true CN112030985A (en) 2020-12-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010760090.XA Pending CN112030985A (en) 2020-07-31 2020-07-31 Hollow steel pipe concrete support, prefabricated member, construction method and support system

Country Status (1)

Country Link
CN (1) CN112030985A (en)

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