CN212801566U - Node structure and supporting system of concrete filled steel tube support and crown beam - Google Patents

Node structure and supporting system of concrete filled steel tube support and crown beam Download PDF

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Publication number
CN212801566U
CN212801566U CN202021566132.8U CN202021566132U CN212801566U CN 212801566 U CN212801566 U CN 212801566U CN 202021566132 U CN202021566132 U CN 202021566132U CN 212801566 U CN212801566 U CN 212801566U
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China
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concrete
steel
steel plate
crown beam
filled
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CN202021566132.8U
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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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Abstract

The utility model relates to a node structure and a supporting system of a concrete-filled steel tube support and a crown beam, belonging to the technical field of foundation pit engineering, in particular to a node structure of a concrete-filled steel tube support and a crown beam, wherein a first end steel plate is fixed at the inner side of the crown beam, and a first telescopic steel member is fixed on the first end steel plate; a second end steel plate is fixed at the end part of the concrete-filled steel tube support, and a second telescopic steel member is fixed on the second end steel plate; the first telescopic steel member is connected with the second telescopic steel member through a bolt; the front end and the rear end of the jack are respectively propped against the second end steel plate and the first end steel plate; the jack is electrically connected with the control system. The utility model also provides a braced system, it supports to have the steel pipe concrete to support between the both sides that its hat roof beam is relative, and the node structure that hat roof beam and steel pipe concrete supported adopts foretell node structure. The requirements of rigidity and equal-strength connection of end nodes can be met, engineering safety is guaranteed, prestress can be applied according to the requirements, and the requirements of repeated loading for foundation pit prestress loss and support relaxation are met.

Description

Node structure and supporting system of concrete filled steel tube support and crown beam
Technical Field
The utility model belongs to the technical field of underground foundation ditch engineering, concretely relates to node structure and braced system of steel pipe concrete support and hat roof beam.
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: the concrete supporting and formwork erecting, steel bar binding, pouring and vibrating, maintenance and later-period removal are carried out, the whole process is long for several months, and the site construction progress is severely restricted. (3) Hard, the degree of difficulty is big: the concrete support construction difficulty is big, breaks the construction after using the completion, need consume a large amount of manpower and materials. (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. 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.
In the existing prefabricated support, weak links are more at the connecting structure, and rigid connection cannot be realized at nodes, so that the overall stability of a foundation pit is insufficient; gaps always exist at the joints, the gaps can be stabilized after being pressed after the foundation pit is excavated, the gaps are transformed into the deformation of the foundation pit, the protection on the construction and the pipeline and the like at the periphery of the foundation pit is not favorable, and meanwhile, a stress relaxation site possibly exists in the use process of the support, so that the local instability of the foundation pit is caused, and the damage of the whole foundation pit is caused.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing a node structure and braced system of steel pipe concrete support and hat roof beam can satisfy the rigidity of tip node, wait the strong needs of connecting, guarantee engineering safety, can exert prestressing force as required again simultaneously, satisfy foundation ditch prestressing loss and support the demand that relaxs needs repeated loading.
In order to achieve the purpose, the technical scheme of the utility model is a node structure of a concrete-filled steel tube support and a crown beam, which comprises the concrete-filled steel tube support, the crown beam, a jack and a control system; a first end steel plate is fixed on the inner side of the crown beam, and a first telescopic steel member is fixed on the first end steel plate; a second end steel plate is fixed at the end part of the concrete-filled steel tube support, and a second telescopic steel member is fixed on the second end steel plate; the first telescopic steel member is connected with the second telescopic steel member through a bolt; the front end and the rear end of the jack are respectively propped against the second end steel plate and the first end steel plate; the jack is electrically connected with the control system.
Further, the first telescopic steel member comprises a first U-shaped steel plate, and one end of the first U-shaped steel plate is connected with the first end steel plate; the second telescopic steel member comprises a second U-shaped steel plate, and one end of the second U-shaped steel plate is connected with the second end steel plate; a plurality of rows of long round bolt holes are formed in the first U-shaped steel plate and the second U-shaped steel plate, and the long round bolt holes in the first U-shaped steel plate are connected with the long round bolt holes in the second U-shaped steel plate through bolts; the jack is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate and the second U-shaped steel plate.
Further, the concrete-filled steel tube support is formed by splicing a plurality of concrete-filled steel tube support prefabricated parts; the two ends of the concrete-filled steel tube support prefabricated member are respectively provided with an annular joint steel plate, a plurality of bolt holes are formed in the joint steel plates in the annular direction, and corresponding bolt holes in adjacent joint steel plates of adjacent concrete-filled steel tube support prefabricated members are respectively connected through bolts; and the second end steel plate is fixed with the joint steel plate at the end part of the concrete filled steel tube support.
Further, the steel tube concrete support prefabricated member comprises a steel tube, wherein concrete is filled in the steel tube, and a hollow part penetrating through the concrete along the axial direction is formed in the concrete; dispose the framework of steel reinforcement in the concrete, connect the steel sheet with steel pipe welding, just the inboard of connecting the steel sheet with framework of steel reinforcement connects, the outside that connects the steel sheet is located outside the steel pipe just is equipped with the bolt hole.
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 inner sides of 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; and a circle of meshing teeth are arranged on the inner wrapping pipe and embedded into the concrete.
Furthermore, a plurality of studs are welded on the inner wall of the steel pipe, and the studs are embedded in the concrete.
Furthermore, a plurality of anchor bolts are pre-buried in the crown beam, a plurality of anchor bolt holes are formed in the first end steel plate, one ends of the anchor bolts extend out of the corresponding anchor bolt holes which penetrate through the crown beam and are fixed through nuts.
The utility model also provides a supporting system, which comprises an enclosure structure, a crown beam and a steel pipe concrete support; the top of the enclosure structure is provided with a crown beam, and the steel pipe concrete support is supported between two opposite sides of the crown beam; the node structure of the crown beam and the concrete filled steel tube support adopts the node structure.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the jack is arranged between the first end steel plate at the inner side of the crown beam and the second end steel plate at the end part of the concrete-filled steel tube support, so that stress compensation can be timely carried out when the stress relaxation phenomenon occurs in the use process of the concrete-filled steel tube support, early warning can be timely carried out when the stress is too large, the local instability of the foundation pit is prevented, and the damage of the whole foundation pit is caused; meanwhile, the crown beam and the concrete-filled steel tube support are rigidly connected with the second telescopic steel member through the first telescopic steel member, so that the safety of the foundation pit is ensured;
(2) the utility model discloses a set up multiseriate long circle bolt hole on the second U-shaped steel sheet of steel pipe concrete support tip and the first U-shaped steel sheet of hat roof beam inboard respectively, rethread bolt passes long circle bolt hole and is connected second U-shaped steel sheet and first U-shaped steel sheet, can satisfy the rigid connection of tip node, wait strong connection's needs, guarantee engineering safety, can adjust the aversion as required simultaneously again, adjust the construction error;
(3) the concrete-filled steel tube support is formed by assembling a plurality of concrete-filled steel tube support prefabricated parts through bolt connection, not only can ensure the safety and stability of foundation pit engineering, but also is convenient to install and disassemble, and is convenient for industrial production and large-area popularization and application;
(4) the utility model discloses a steel core concrete supports prefab adopts the hollow member of steel pipe intussuseption concrete, not only can greatly reduced prefabricated component's weight, and the prefabricated component's of being convenient for recycles, and the hoop effect of outer steel pipe can show the bearing capacity that promotes the intussuseption concrete moreover for hollow steel core concrete supports that bearing capacity is higher, anti deformability is stronger, ensures foundation ditch engineering safety.
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 plan view of a support system according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a concrete filled steel tube support preform according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a joint of precast concrete filled steel tube support members according to an embodiment of the present invention;
FIG. 4 is a longitudinal sectional view of a joint of a concrete filled steel tube support prefabricated member provided by an embodiment of the present invention;
fig. 5 is a top view of a connection structure of a concrete filled steel tube support and a crown beam according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of a connection structure of a concrete filled steel tube support and a crown beam according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating a connection between a first U-shaped steel plate and a first end steel plate according to an embodiment of the present invention;
fig. 8 is a schematic view illustrating a connection between a second U-shaped steel plate and a second end steel plate according to an embodiment of the present invention;
fig. 9 is a left side view of a first U-shaped steel plate according to an embodiment of the present invention;
fig. 10 is a right side view of a second U-shaped steel plate according to an embodiment of the present invention;
in the figure: 1. a steel pipe concrete support prefabricated member; 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. an anchor bolt; 18. a first end steel plate; 19. a nut; 20. a first U-shaped steel plate; 21. a second U-shaped steel plate; 22. a jack; 23. plug welding of the through hole; 24. a second end steel plate; 25. a control system; 26. a wire; 27. a long round bolt hole; 28. a water drainage hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, 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. 5 to 6, the present embodiment provides a node structure of a concrete-filled steel tube support and a crown beam, which includes the concrete-filled steel tube support, the crown beam 2, a jack 22 and a control system 25; a first end steel plate 18 is fixed on the inner side of the crown beam 2, and a first telescopic steel member is fixed on the first end steel plate 18; a second end steel plate 24 is fixed at the end part of the steel pipe concrete support, and a second telescopic steel member is fixed on the second end steel plate 24; the first telescopic steel member and the second telescopic steel member are connected through a bolt 11; the front end and the rear end of the jack 22 are respectively abutted against the second end steel plate 24 and the first end steel plate 18; the jack 22 is electrically connected to the control system 25. In the embodiment, the jack 22 is arranged between the first end steel plate 18 on the inner side of the crown beam 2 and the second end steel plate 24 on the end part of the concrete-filled steel tube support, and the jack 22 is connected with the control system 25 to form the intelligent stress compensation device, so that prestress can be constructed as required, and the requirements of prestress loss and support relaxation for repeated loading are met; in the use process of the concrete-filled steel tube support, stress compensation is carried out in time when the stress relaxation phenomenon occurs, early warning is carried out in time when the stress is too large, and the damage to the whole foundation pit caused by local instability of the foundation pit is prevented; simultaneously crown beam 2 and steel pipe concrete support realize rigid connection through first flexible steel member and the flexible steel member of second, guarantee that tip node and steel pipe concrete support reach the wholeness, rigidity and bearing capacity the same with cast in situ concrete support or similar, ensure foundation ditch safety.
The jack 22 of the embodiment is an intelligent jack, has sufficient jacking force, can sense self stress and transmit the self stress to the control system 25 through the lead 26, the control system 25 makes corresponding response according to the stress, and if the stress is relaxed, automatic stress compensation is performed; if the stress is too large and exceeds a designed early warning value, an alarm is automatically given; the jack 22 should not be oversized to prevent later difficulty in threading the bolt 11 through the oblong bolt hole 27.
Further, the first telescopic steel member comprises a first U-shaped steel plate 20, and one end of the first U-shaped steel plate 20 is connected with the first end steel plate 18 by equal-strength welding; the second telescopic steel member comprises a second U-shaped steel plate 21, and one end of the second U-shaped steel plate 21 is connected with the second end steel plate 24 through equal-strength welding; a plurality of rows of long bolt holes 27 are formed in the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and the long bolt holes 27 in the first U-shaped steel plate 20 are connected with the long bolt holes 27 in the second U-shaped steel plate 21 through bolts 11; the jack 22 is arranged in the U-shaped groove formed by connecting the first U-shaped steel plate 20 and the second U-shaped steel plate 21. In this embodiment, a plurality of rows of long circular bolt holes 27 with adjustable positions are formed in the two side plates of the first U-shaped steel plate 20 and the two side plates of the second U-shaped steel plate 21, the long circular bolt holes 27 are arranged along the supporting direction, the first U-shaped steel plate 20 and the second U-shaped steel plate 21 are reliably connected by bolts 11 penetrating through the long circular bolt holes 27, the end nodes of the concrete-filled steel tube support and the crown beam 2 adopt the variable-length circular hole steel box slot nodes, the rigid connection and equal-strength connection requirements of the end nodes can be met, the engineering safety is ensured, meanwhile, the relative positions of the long circular bolt holes 27 can be adjusted according to requirements to change the lengths of the joints, and therefore errors in construction are eliminated.
Optimally, the wall thicknesses of the first U-shaped steel plate 20 and the second end steel plate 24 are properly thickened, the first U-shaped steel plate and the second end steel plate are welded at equal strength, and the stiffening plates can be welded on the premise of not influencing the installation of other components, so that the connection rigidity between the first U-shaped steel plate and the second end steel plate is enhanced.
Optimally, a drain hole 28 is reserved at the corresponding position of the bottom plate of the first U-shaped steel plate 20 and the bottom plate of the second U-shaped steel plate 21 to prevent water from accumulating in the U-shaped groove where the jack 22 is located; meanwhile, the size of the water drainage hole 28 is not required to be too large, so that the steel plate at the joint is prevented from being weakened.
Further, the concrete-filled steel tube support is formed by splicing a plurality of concrete-filled steel tube support prefabricated members 1; two ends of the concrete filled steel tube supporting prefabricated part 1 are respectively provided with an annular joint steel plate 10, a plurality of bolt holes are formed in the joint steel plates 10 along the annular direction, and corresponding bolt holes in adjacent joint steel plates 10 of the adjacent concrete filled steel tube supporting prefabricated part 1 are respectively connected through bolts 11; the second end steel plate 24 is fixed with the joint steel plate 10 at the end of the concrete filled steel tube support. In the embodiment, the outer diameters of the joint steel plate 10 and the second end steel plate 24 are consistent, the positions of the reserved bolt holes are consistent, only holes are reserved in the middle of the joint steel plate 10, and finally the hollow part 9 of the concrete filled steel tube support prefabricated member 1 is formed, while the second end steel plate 24 is a complete round steel plate without a hole in the middle; the concrete filled steel tube supports prefab 1 and passes through bolt 11 and realize rigid connection, realizes that the equal strength of node and component reaches wholeness, rigidity and bearing capacity similar with cast in situ concrete support, ensures foundation ditch safety, and the installation is convenient with dismantle, is convenient for batch production preparation and large tracts of land popularization and application.
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 concrete filled steel tube supporting prefabricated part 1 in the embodiment can be provided with a plurality of fixed modulus sections with proper lengths according to needs, the fixed modulus sections are too long to be hoisted, and joints are too many and difficult to connect due to too short length; as an implementation mode, the middle-section prefabricated components can be designed into standard modules with specifications of 4m, 5m, 6m and the like, the end-section prefabricated components can be designed into standard modules with specifications of 2m, and the concrete-filled steel tube support prefabricated components 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 can adopt 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 obviously reduce the bearing capacity of the member, but can obviously reduce the weight of the member, thereby facilitating the installation, transportation and disassembly, and the concrete-filled steel tube support prefabricated member also can adopt a solid structure.
Furthermore, the steel tube concrete support prefabricated member 1 comprises a steel tube 4, wherein the steel tube 4 is filled with concrete 6, and a hollow part 9 penetrating through the concrete 6 along the axial direction is arranged in the concrete 6; dispose steel reinforcement framework in the concrete 6, connect steel sheet 10 with steel pipe 4 welding, just connect the inboard of steel sheet 10 with steel reinforcement framework connects, the outside that connects steel sheet 10 is located steel pipe 4 is outer and be equipped with the bolt hole. The precast concrete-filled steel tube support member 1 of the embodiment is a hollow member formed by filling concrete 6 in a steel tube 4, not only can the advantages of two materials of steel and concrete be fully exerted, and has high cost performance and obvious economic benefit compared with a pure steel support, and compared with a concrete-sized concrete support, the precast concrete-filled steel tube support member has higher rigidity, and the steel tube 4 is an outer skin of the precast support member, so that the internally filled concrete 6 can be protected from being damaged, and can be detached after the engineering is finished, the precast member can be recycled for many times, meanwhile, the bearing capacity of the internally filled concrete 6 can be obviously improved under the action of the hoop of the steel tube 4, the hollow steel tube concrete support member has high bearing capacity (strength), and the deformation resistance (rigidity) is strong, and the same or even higher strength and rigidity of the conventional concrete support member can be achieved, and the. In addition, the steel reinforcement cage in the concrete 6 in this embodiment is connected to the joint steel plate 10, further increasing the integrity of the steel pipe concrete support preform 1.
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.
Furthermore, 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 are reliably welded with 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 along the circumference of the steel pipe 4, the thickness may be 10-20mm, the size is determined according to the stress, and the surplus is reserved.
Furthermore, 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; optimally, a circle of meshing teeth 16 are arranged on 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 and are meshed into the concrete 6, and the integrity of the 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.
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.
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 23, 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.
In this embodiment, steel pipe 4, peg 5, spiral stirrup 8, vertical muscle 7 are tightly connected with the concrete 6 of steel pipe 4 intussuseption as an organic whole, and intensity is high, rigidity is big, far exceeds concrete size concrete support, and is not fragile in the use, but steel pipe concrete support prefab 1 manifold cycles uses, for traditional concrete support, the investment is low, the time limit for a project is short, the quality is high, for traditional steel support, the wholeness is good, rigidity is big, safe and reliable.
Furthermore, a plurality of anchor bolts 17 are pre-buried in the crown beam 2, a plurality of anchor bolt holes are formed in the first end steel plate 18, and one ends of the anchor bolts 17 extend out of the crown beam 2 and then penetrate through the corresponding anchor bolt holes and are fixed through nuts 19. In the embodiment, the anchor bolt 17 is in place when the steel bars are bound on the crown beam 2 and is reliably connected with the steel bars in the crown beam 2 and poured into the concrete of the crown beam 2, and the anchor bolt 17 needs to have enough anchoring length in the crown beam 2; when the first end steel plate 18 is installed, the anchor bolt 17 penetrates through the anchor bolt hole in the first end steel plate 18, and the nut 19 is screwed, so that the installation is simple and convenient, and the connection is reliable; the nut 19 is preferably provided with two backing plates below, so that failure damage or looseness of one is avoided.
Furthermore, as shown in fig. 9, the outer wall of the first U-shaped steel plate 20 is connected to the first end steel plate 18 through the stiffener 12, so as to increase the connection rigidity between the first U-shaped steel plate 20 and the first end steel plate 18, the stiffener 12 may be arranged at intervals along the circumferential direction of the first U-shaped steel plate 20, and the size and thickness of the stiffener may be determined according to the force, so as to reserve the redundancy.
Example two
As shown in fig. 1, the present embodiment further provides a support system, which includes a building envelope 3, a crown beam 2 and a concrete-filled steel tube support; the top of the envelope structure 3 is provided with a crown beam 2, and the steel pipe concrete support is supported between two opposite sides of the crown beam 2; the node structure of the crown beam 2 and the concrete filled steel tube support adopts the node structure.
Further, envelope 3's inboard still is equipped with the waist rail, supports between the relative both sides of waist rail and has the steel core concrete supports, and the waist rail with the node structure that steel core concrete supported also can adopt the node structure that embodiment one provided, realizes waist rail and assembled steel core concrete support rigid connection to the realization is in the super deep basal pit, and assembled steel core concrete supports the multichannel tradition concrete support of fungible, improves the assembly rate.
EXAMPLE III
As shown in fig. 2 to 10, the present embodiment provides a construction method of a node structure of a concrete filled steel tube support and a crown beam 2, including the steps of:
s1, manufacturing a concrete filled steel tube support prefabricated part 1 in a factory according to a design drawing, transporting to a construction site, and connecting and assembling the prefabricated part into a concrete filled steel tube support through bolts 11;
s2, when the crown beam 2 is constructed, embedding the anchor bolt 17 in the crown beam 2, and enabling one end of the anchor bolt 17 to extend out of the inner side of the crown beam 2;
s3, after the crown beam 2 reaches the design strength, welding a first U-shaped steel plate 20 on the first end steel plate 18, and then installing the first end steel plate 18 on the crown beam 2 to enable the anchor bolt 17 on the crown beam 2 to penetrate through the anchor bolt hole on the first end steel plate 18 and be fixed through the nut 19;
s4, welding a second U-shaped steel plate 21 on the second end head steel plate 24, and then fixing the second end head steel plate 24 and one end of the concrete-filled steel tube support;
s5, aligning the first U-shaped steel plate 20 and the second U-shaped steel plate 21, placing a jack 22 in a U-shaped groove formed by the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and simultaneously connecting the jack 22 with the control system 25 through a lead 26;
s6, controlling the jack 22 to pressurize through the control system 25, eliminating joint displacement, stopping pressure test when the pressure of the jack 22 reaches a design value, and maintaining the pressure;
s7, inserting and screwing bolts 11 into the corresponding oblong bolt holes 27 in the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and connecting the first U-shaped steel plate 20 and the second U-shaped steel plate 21;
s8, in the construction process, if the control system 25 monitors that the pressure of the jack 22 is relaxed, the control system 25 controls the jack 22 to automatically pressurize; if the jack 22 is monitored to be abnormal due to overlarge pressure, early warning is timely carried out, and the problem that the whole foundation pit is damaged due to local instability of the foundation pit is avoided.
The outside steel pipe 4 of this embodiment has the effect of dado, the concrete filled steel tube supports prefab 1 and is difficult for receiving the damage, and all adopt bolted connection between the concrete filled steel tube supports prefab 1 and between concrete filled steel tube supports prefab 1 and the hat roof beam, realize dismantling easily, therefore, after foundation ditch engineering construction finishes, can demolish the bolt 11 of connecting concrete filled steel tube supports prefab 1 and hat roof beam and the bolt 11 of connecting concrete filled steel tube supports prefab 1 and concrete filled steel tube supports prefab 1, realize the recovery of concrete filled steel tube supports prefab 1, but recycle many times simultaneously, and the cost is reduced.
The concrete method for manufacturing the steel tube concrete support prefabricated member 1 in the factory in the step S1 comprises the following steps:
s11, 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;
s12, 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;
s13, welding joint steel plates 10 at two ends of the steel pipe 4 respectively;
s14, 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;
s15, connecting the joint steel plate 10 with the longitudinal ribs 7 through the perforation plug welding 23;
s16, 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 S17, filling concrete 6 into the steel pipe 4 and reserving the hollow part 9, thereby completing the manufacture of the steel pipe concrete support prefabricated member 1.
In the manufacturing method of the 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 also prefabricated into a whole in a split mode, 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 lining pipe 14 and the joint 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 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, 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, the hollow part 9 is reserved, and the prefabrication of the steel pipe concrete; 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 manufacturing of the 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.
Specifically, in step S4, the concrete filled steel tube support prefabricated member 1 is assembled into the concrete filled steel tube support by the following specific method: the two concrete filled steel tube supporting prefabricated parts 1 are centered, so that the joint steel plates 10 adjacent to the two concrete filled steel tube supporting prefabricated parts 1 are completely aligned, the bolts 11 are inserted into the corresponding bolt holes in the adjacent joint steel plates 10 and screwed down, the concrete filled steel tube supporting prefabricated parts 1 are sequentially connected, and the concrete filled steel tube supporting splicing is completed.
The concrete-filled steel tube support prefabricated members 1 of the embodiment are connected through a plurality of high-strength bolts on the joint steel plates 10; the joint steel plate 10 and the steel pipe 4 can be integrally manufactured or welded, the firmness is increased through the stiffening plate 12, the force transmission is increased through the joint inner lining pipe 14 and the joint outer lining pipe 13, the longitudinal ribs 7 are connected with the joint steel plate 10 through the perforated plug welding 23, and the rigidity of the middle node structure can be completely guaranteed.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a node structure of steel pipe concrete support and crown beam which characterized in that: the device comprises a steel pipe concrete support, a crown beam, a jack and a control system; a first end steel plate is fixed on the inner side of the crown beam, and a first telescopic steel member is fixed on the first end steel plate; a second end steel plate is fixed at the end part of the concrete-filled steel tube support, and a second telescopic steel member is fixed on the second end steel plate; the first telescopic steel member is connected with the second telescopic steel member through a bolt; the front end and the rear end of the jack are respectively propped against the second end steel plate and the first end steel plate; the jack is electrically connected with the control system.
2. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 1, wherein: the first telescopic steel member comprises a first U-shaped steel plate, and one end of the first U-shaped steel plate is connected with the first end steel plate; the second telescopic steel member comprises a second U-shaped steel plate, and one end of the second U-shaped steel plate is connected with the second end steel plate; a plurality of rows of long round bolt holes are formed in the first U-shaped steel plate and the second U-shaped steel plate, and the long round bolt holes in the first U-shaped steel plate are connected with the long round bolt holes in the second U-shaped steel plate through bolts; the jack is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate and the second U-shaped steel plate.
3. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 1, wherein: the concrete-filled steel tube support is formed by splicing a plurality of concrete-filled steel tube support prefabricated parts; the two ends of the concrete-filled steel tube support prefabricated member are respectively provided with an annular joint steel plate, a plurality of bolt holes are formed in the joint steel plates in the annular direction, and corresponding bolt holes in adjacent joint steel plates of adjacent concrete-filled steel tube support prefabricated members are respectively connected through bolts; and the second end steel plate is fixed with the joint steel plate at the end part of the concrete filled steel tube support.
4. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 3, wherein: the steel tube concrete support prefabricated part comprises a steel tube, concrete is filled in the steel tube, and a hollow part penetrating through the concrete along the axial direction is formed in the concrete; dispose the framework of steel reinforcement in the concrete, connect the steel sheet with steel pipe welding, just the inboard of connecting the steel sheet with framework of steel reinforcement connects, the outside that connects the steel sheet is located outside the steel pipe just is equipped with the bolt hole.
5. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 4, 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.
6. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 4, wherein: inner wrapping pipes are arranged on the inner sides of the two ends of the concrete and are welded with the joint steel plates; and a circle of meshing teeth are arranged on the inner wrapping pipe and embedded into the concrete.
7. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 4, wherein: and a plurality of studs are welded on the inner wall of the steel pipe and embedded into the concrete.
8. The node structure of the concrete-filled steel tube support and the crown beam as claimed in claim 1, wherein: a plurality of anchor bolts are pre-buried in the crown beam, a plurality of anchor bolt holes are formed in the first end steel plate, one ends of the anchor bolts stretch out of the crown beam and penetrate through the corresponding anchor bolt holes, and the anchor bolt holes are fixed through nuts.
9. A support system, characterized by: the steel pipe concrete support comprises a building envelope, a crown beam and a steel pipe concrete support; the top of the enclosure structure is provided with a crown beam, and the steel pipe concrete support is supported between two opposite sides of the crown beam; the node structure of the crown beam and the concrete filled steel tube support adopts the node structure of any one of claims 1 to 8.
CN202021566132.8U 2020-07-31 2020-07-31 Node structure and supporting system of concrete filled steel tube support and crown beam Active CN212801566U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021566132.8U CN212801566U (en) 2020-07-31 2020-07-31 Node structure and supporting system of concrete filled steel tube support and crown beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021566132.8U CN212801566U (en) 2020-07-31 2020-07-31 Node structure and supporting system of concrete filled steel tube support and crown beam

Publications (1)

Publication Number Publication Date
CN212801566U true CN212801566U (en) 2021-03-26

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CN (1) CN212801566U (en)

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