CN212336046U - Assembled concrete-filled steel tube support system - Google Patents
Assembled concrete-filled steel tube support system Download PDFInfo
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- CN212336046U CN212336046U CN202021564254.3U CN202021564254U CN212336046U CN 212336046 U CN212336046 U CN 212336046U CN 202021564254 U CN202021564254 U CN 202021564254U CN 212336046 U CN212336046 U CN 212336046U
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Abstract
The utility model belongs to the technical field of underground foundation pit engineering, in particular to an assembly type concrete-filled steel tube supporting system, which comprises an enclosure structure and an assembly type concrete-filled steel tube support; the top of the enclosure structure is provided with a crown beam, the assembled concrete-filled steel tube support is supported between two opposite sides of the crown beam, and the assembled concrete-filled steel tube support is formed by splicing a plurality of prefabricated concrete-filled steel tube supports; and supporting components are arranged in the crown beam, and two ends of the assembled concrete-filled steel tube support are connected with two sides of the supporting components through telescopic connecting pieces respectively. The assembled concrete-filled steel tube support adopted in the support system of the utility model is formed by splicing a plurality of concrete-filled steel tube support prefabricated parts, the assembled concrete-filled steel tube support and the support component in the crown beam are detachably connected through the telescopic connecting piece, so that the assembly and disassembly are convenient, and the recycling of the components is convenient; and the length of the end joint can be adjusted by the telescopic connecting piece.
Description
Technical Field
The utility model belongs to the technical field of underground foundation ditch engineering, concretely relates to assembled steel pipe concrete braced 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.
Although the traditional steel pipe support can be recycled and is convenient to construct, the traditional steel pipe support and a foundation pit retaining structure can only bear pressure, and the traditional steel pipe support has poor integrity and poor deformation resistance and becomes a weak link for foundation pit safety; and the support segments prefabricated in the factory have standard lengths, and errors always exist in the construction process.
Disclosure of Invention
In order to overcome the deficiencies in the prior art, the utility model aims at providing an assembled steel pipe concrete braced system can improve braced system's stability, ensures foundation ditch engineering safety, and adorns, dismantles the convenience, and the recycling of the component of being convenient for.
In order to achieve the purpose, the technical scheme of the utility model is an assembly type concrete-filled steel tube supporting system, which comprises an enclosure structure and an assembly type concrete-filled steel tube support; the top of the enclosure structure is provided with a crown beam, the assembled concrete-filled steel tube support is supported between two opposite sides of the crown beam, and the assembled concrete-filled steel tube support is formed by splicing a plurality of prefabricated concrete-filled steel tube supports; and supporting components are arranged in the crown beam, and two ends of the assembled concrete-filled steel tube support are connected with two sides of the supporting components through telescopic connecting pieces respectively.
Furthermore, the supporting assembly comprises a supporting steel plate and supporting legs, one side of the supporting steel plate is connected with the supporting legs and is reinforced by stiffening plates, and the other side of the supporting steel plate is connected with the telescopic connecting piece.
Further, the telescopic connecting piece comprises a first end steel plate, a first U-shaped steel plate, a second end steel plate and a second U-shaped steel plate; the first U-shaped steel plate is welded on the first end steel plate, and the first end steel plate is fixed with the support assembly; the second U-shaped steel plate is welded on the second end steel plate, and the second end steel plate is fixed with the end part of the assembled concrete-filled steel tube support; the first U-shaped steel plate and the second U-shaped steel plate are both provided with a plurality of rows of long round bolt holes, and the long round bolt holes in the first U-shaped steel plate and the second U-shaped steel plate are connected through bolts.
Furthermore, the first U-shaped steel plate and the second U-shaped steel plate are connected to form a U-shaped groove, a jack connected with a control system is arranged in the U-shaped groove, and the front end and the rear end of the jack are respectively abutted to the second end steel plate and the first end steel plate.
Furthermore, 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; the telescopic connecting piece is connected with the joint steel plate at the end part of the assembled 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; the joint steel plate is welded with the steel pipe, the inner side of the joint steel plate is located in the steel pipe, and the outer side of the joint steel plate is located outside the steel pipe and is provided with the bolt hole.
Furthermore, the enclosure structure is internally provided with a lattice column and a steel surrounding purlin, the lattice column is provided with the steel surrounding purlin, and the steel surrounding purlin is connected with the assembled steel pipe concrete support.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the assembled concrete-filled steel tube support adopted in the support system of the utility model is formed by splicing a plurality of concrete-filled steel tube support prefabricated parts, the assembled concrete-filled steel tube support and the support component in the crown beam are detachably connected through the telescopic connecting piece, so that the assembly and disassembly are convenient, and the recycling of the components is convenient; the length of the end joint can be adjusted by the telescopic connecting piece;
(2) the utility model discloses a set up the supporting component at the other end of the telescopic connection spare at assembled steel pipe concrete support both ends, and during construction, support on envelope through the supporting component, pour the hat roof beam again and pour the supporting component in it, improve the wholeness of assembled steel pipe concrete support and hat roof beam;
(3) the concrete filled steel tube supporting prefabricated member and the concrete filled steel tube supporting prefabricated member are connected through the bolt, so that the rigid connection and equal-strength connection requirements of the middle node can be met, the safety and stability of foundation pit engineering are ensured, the construction is convenient, the installation and the disassembly are convenient, and the industrialized production and the large-area popularization and application are convenient;
(4) the utility model discloses a set up multiseriate long round bolt hole respectively on scalable connecting piece's first U-shaped steel sheet and second U-shaped steel sheet, rethread bolt passes long round bolt hole and connects 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 dislocation as required simultaneously again, adjust construction error;
(5) the utility model discloses a set up the jack between the inboard first end steel sheet of hat roof beam and the second end steel sheet of assembled concrete-filled steel tube support tip, in the assembled concrete-filled steel tube support use, the phenomenon of stress relaxation appears and just in time carries out stress compensation, and the too big then in time early warning of stress appears, prevents the local unstability of foundation ditch, arouses the destruction of whole foundation ditch.
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 layout view of an assembled concrete-filled steel tube support system according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an assembled concrete filled steel tube support system according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a concrete filled steel tube support preform according to an embodiment of the present invention;
FIG. 4 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. 5 is a longitudinal sectional view of a joint of precast concrete filled steel tube supports provided by an embodiment of the present invention;
FIG. 6 is a top view of the junction of an assembled concrete filled steel tubular support and a crown beam according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of the junction of an assembled concrete-filled steel tube support and a crown beam according to an embodiment of the present invention;
fig. 8 is a left side view of a first U-shaped steel plate according to an embodiment of the present invention;
fig. 9 is a right side view of a second U-shaped steel plate according to an embodiment of the present invention;
fig. 10 is a schematic connection diagram of a first end steel plate and a first U-shaped steel plate according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a support assembly 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 control system; 25. a wire; 26. a long round bolt hole; 27. a lattice column; 28. steel purlin; 29. a support steel plate; 30. supporting legs; 31. an anti-corrosion coating; 32. a second end steel plate.
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
The embodiment provides an assembly type concrete-filled steel tube supporting system which comprises an envelope structure 3 and an assembly type concrete-filled steel tube support; the top of the enclosure structure 3 is provided with a crown beam 2, the assembly type concrete-filled steel tube support is supported between two opposite sides of the crown beam 2, and the assembly type concrete-filled steel tube support is formed by splicing a plurality of prefabricated concrete-filled steel tube support members 1; and a supporting component is arranged in the crown beam 2, and two ends of the assembled concrete-filled steel tube support are connected with two sides of the supporting component through telescopic connecting pieces respectively. The assembled concrete-filled steel tube support adopted in the support system of the embodiment is formed by splicing a plurality of prefabricated concrete-filled steel tube support members 1, and the assembled concrete-filled steel tube support is detachably connected with the support components in the crown beam 2 through telescopic connecting pieces, so that the assembly and disassembly are convenient, and the members can be recycled conveniently; and the length of the end joint can be adjusted by the telescopic connecting piece.
Further, the supporting assembly comprises a supporting steel plate 29 and supporting legs 30, one side of the supporting steel plate 29 is connected with the supporting legs 30 and is reinforced by the stiffening plates 12, and the other side of the supporting steel plate 29 is connected with the telescopic connecting piece. As shown in fig. 6, 7 and 11, the supporting steel plate 29 is vertically arranged, has the same size as the first end steel plate 18, and preferably has a thickness of more than 30 mm; the bottom of the supporting steel plate 29 is connected with two supporting legs 30, and the supporting steel plate 29 and the two supporting legs 30 are respectively welded and reinforced through the stiffening plates 12, so that the integrity of the supporting assembly and the connection stability of the supporting assembly and the crown beam 2 are improved.
Furthermore, a plurality of anchor bolts 17 are arranged in the crown beam 2, a plurality of anchor bolt holes are arranged on the first end steel plate 18 and the supporting steel plate 29, and one end of each anchor bolt 17 sequentially penetrates through the corresponding anchor bolt holes in the supporting steel plate 29 and the first end steel plate 18 and is fixed through a nut 19. As shown in fig. 6-8, the anchor bolt 17 of the present embodiment has a sufficient anchoring length in the crown beam 2, and the anchor bolt 17 and the supporting leg 30 can be securely connected with the reinforcing bars in the crown beam 2; the nut 19 is preferably provided with two backing plates below, so that failure damage or looseness of one is avoided.
Further, the telescopic connection piece comprises a first end steel plate 18, a first U-shaped steel plate 20, a second end steel plate 32 and a second U-shaped steel plate 21; the first U-shaped steel plate 20 is welded to the first end steel plate 18, and the first end steel plate 18 is fixed with the support component; the second U-shaped steel plate 21 is welded on the second end steel plate 32, and the second end steel plate 32 is fixed with the end part of the fabricated concrete-filled steel tube support; the first U-shaped steel plate 20 and the second U-shaped steel plate 21 are both provided with a plurality of rows of long round bolt holes 26, and the long round bolt holes 26 on the first U-shaped steel plate 20 and the second U-shaped steel plate 21 are connected through bolts 11. As shown in fig. 6 to 10, in this embodiment, a plurality of rows of position-adjustable oblong bolt holes 26 are respectively formed in both side plates of the first U-shaped steel plate 20 and both side plates of the second U-shaped steel plate 21, and the oblong bolt holes 26 are arranged along the supporting direction, and the second U-shaped steel plate 21 and the first U-shaped steel plate 20 are connected by bolts 11 passing through the corresponding oblong bolt holes 26, so that the requirements of rigid connection and equal-strength connection of end nodes can be met, the engineering safety and the detachability of the end nodes are ensured, the prefabricated parts can be recycled conveniently, and meanwhile, the relative positions of the oblong bolt holes 26 can be adjusted as required to change the length of the joint, and the construction error can be adjusted.
Furthermore, the first U-shaped steel plate 20 and the second U-shaped steel plate 21 are connected to form a U-shaped groove, a jack 22 connected to a control system 24 is disposed in the U-shaped groove, and a front end and a rear end of the jack 22 respectively abut against the second end steel plate 32 and the first end steel plate 18. As shown in fig. 6, in the embodiment, the jack 22 is arranged between the crown beam and the fabricated concrete-filled steel tube support, and the jack 22 is connected with the control system 24 to form the intelligent stress compensation device, so that prestress can be constructed as required, and the requirements of repeated loading for prestress loss and support relaxation are met; in the use process of the assembled concrete-filled steel tube 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 jack 22 adopted in the embodiment is an intelligent jack, has enough jacking force, can sense self stress and transmit the stress to the control system 24 through the lead 25, the control system 24 makes corresponding response according to the stress, and if the stress is relaxed, the stress is automatically compensated; if the stress is too large and exceeds the designed early warning value, the alarm is automatically given.
Optimally, as shown in fig. 10, the wall thicknesses of the first U-shaped steel plate 20 and the first end steel plate 18 are preferably thickened, and the first U-shaped steel plate and the first end steel plate are welded with equal strength, so that the stiffening plate 12 can be welded on the premise of not affecting the installation of other components, and the connection rigidity between the first U-shaped steel plate and the second end steel plate is enhanced.
Optimally, drain holes are reserved at corresponding positions on 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; simultaneously, the size of the water drainage hole is not too large, and the steel plate at the joint is prevented from being weakened.
Furthermore, 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 telescopic connecting piece is connected with a joint steel plate 10 at the end part of the assembled concrete-filled steel tube support. As shown in fig. 4 and 5, the concrete filled steel tube supports and connects between the prefab 1 through a plurality of bolts 11 in this embodiment, not only can satisfy the rigid connection of middle part node, wait the needs of strong connection, guarantee the safety and stability of foundation ditch engineering, convenient construction moreover, the installation with dismantle conveniently, be convenient for batch production preparation and large tracts of land popularization and application. The joint steel plate 10 in the embodiment 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 manner; the bolt 11 can be a high-strength bolt or a mechanical bolt, and the stress requirement can be met; this embodiment can set up one row or multirow bolt hole along the hoop on connecting steel sheet 10, and every row of bolt hole all has a plurality ofly, and adjacent corresponding bolt hole that connects on the steel sheet 10 all realizes rigid connection through bolt 11, and every two all welds stiffening plate 12 between the bolt 11, ensures the rigid connection of middle node, realizes the equal strong connection of node and component, guarantees foundation ditch engineering's safety and stability.
The concrete filled steel tube support prefabricated member 1 in the embodiment may adopt a solid structure or a hollow structure.
As an embodiment, as shown in fig. 3 to 5, the steel pipe concrete support prefabricated member 1 comprises a steel pipe 4, the steel pipe 4 is filled with concrete 6, and the concrete 6 is internally provided with a hollow part 9 penetrating along the axial direction; the joint steel plate 10 is welded with the steel pipe 4, the inner side of the joint steel plate 10 is located in the steel pipe 4, and the outer side of the joint steel plate 10 is located outside the steel pipe 4 and is provided with the bolt holes. The hollow member of concrete filled steel tube support prefab 1 of this embodiment for steel pipe 4 intussuseption concrete 6, not only can the advantage of two kinds of materials of full play steel and concrete, the sexual valence relative altitude, for pure steel support, obvious economic benefits has, and steel pipe 4 is the exocuticle of prefabricated support, can protect the concrete 6 of inside packing not destroyed, can dismantle after the engineering finishes, realize prefabricated component manifold cycles uses, the hoop effect of steel pipe 4 can show the bearing capacity who promotes intussuseption concrete 6 simultaneously, can reach the same or even higher intensity and rigidity of conventional concrete support, ensure foundation ditch engineering safety. In addition, in this embodiment, the hollow portions of the plurality of steel pipe concrete support prefabricated members 1 constituting the steel pipe concrete support prefabricated member 1 are communicated, so that the assembled steel pipe concrete support has higher bearing capacity and stronger deformation resistance, and the safety of foundation pit engineering is ensured.
Specifically, 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, and the section of the inner wall is not limited to be circular, and can also be in various shapes such as square, polygon and the like.
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. 4 and 5, 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. 4 and 5, in the present embodiment, the connection stiffness between the joint steel plate 10 and the steel pipe 4 is increased by the stiffener 12, and the size and thickness of the stiffener 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.
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; furthermore, 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. 4 and 5, 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, be configured with spiral stirrup 8 and many in concrete 6 and indulge muscle 7, many are indulged muscle 7 and are followed spiral stirrup 8's inboard interval arrangement and all with spiral stirrup 8 is connected, it is connected with joint steel sheet 10 through perforation plug welding 23 to indulge muscle 7. As shown in fig. 3 to 5, 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 to 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.
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. 3, 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 steel pipe concrete support prefabricated member 1 has high strength and rigidity, is not easy to damage in the use process, and can be recycled for multiple times; the joint inner lining pipe 14 and the joint outer lining pipe 13 are respectively arranged on the inner side and the outer side of the steel pipe 4, the joint inner lining pipe 14 and the joint outer lining pipe 13 are welded to the steel pipe 4 and the joint steel plate 10, the joint steel plate 10 is connected with the longitudinal rib 7 through the perforation plug welding 23, the inner wrapping pipe 15 is welded on the joint steel plate 10 on the inner side of the concrete 6, the joint steel plate 10 is ensured to be reliably connected with the steel pipe 4 and the concrete 6, and the integrity of the steel pipe concrete support prefabricated member 1 is improved.
Further, as shown in fig. 3, the outer surface of the steel pipe 4 is coated with an anticorrosive coating 31 to prevent the surface of the concrete filled steel pipe support preform 1 from being rusted and damaged or having a reduced strength.
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.
Furthermore, a lattice column 27 and a steel purlin 28 are further arranged in the envelope structure 3, the lattice column 27 is provided with the steel purlin 28, and the steel purlin 28 is connected with the assembled steel pipe concrete support. As shown in fig. 1 and 2, in the present embodiment, a plurality of lattice columns 27 are vertically arranged in the middle area of the envelope 3 in the width direction, and the positions of the plurality of lattice columns 27 corresponding to the crown beams 2 are connected by steel purlins 28 arranged in the length direction; optimally, the steel enclosing purlin 28 is vertically arranged and connected with the assembly type concrete-filled steel tube support, so that the middle part of the assembly type concrete-filled steel tube support is prevented from being greatly deformed, and the stability of the whole supporting system is further improved. The lattice column 27 in the embodiment is a section steel column formed by welding four angle steels and batten plates, the lattice column 27 is square, the side length is determined by calculation, and usually 500mm or 600mm can be selected; the steel encloses purlin 28 and forms for two channel-section steel combinations, and two channel-section steels can be arranged respectively in the both sides of lattice column 27, and the channel-section steel section is confirmed by calculating, and steel encloses purlin 28 and is connected with lattice column 27 to be connected with crossing steel pipe concrete support prefab 1, guarantee braced system's firm.
Example two
The embodiment provides a construction method of an assembly type concrete-filled steel tube supporting system, which comprises the following steps:
s1, manufacturing a concrete filled steel tube support prefabricated part 1, and constructing an enclosure structure 3 and a lattice column 27 in a factory according to a design drawing;
s2, conveying the concrete-filled steel tube support prefabricated part 1 to a construction site, and splicing by bolts 11 to form an assembled concrete-filled steel tube support;
s3, welding the first U-shaped steel plate 20 and the first end steel plate 18, sequentially penetrating the anchor bolt 17 through the support steel plate 29 with the support leg 30 at the bottom and the first end steel plate 18, and fixing the anchor bolt by the nut 19;
s4, welding the second U-shaped steel plate 21 and the second end head steel plate 32, and fixing the second end head steel plate 32 and the end part of the fabricated concrete-filled steel tube support through the bolt 11;
s5, pre-connecting the long round bolt hole 26 in the first U-shaped steel plate 20 with the long round bolt hole 26 in the second U-shaped steel plate 21 through the bolt 11 without screwing;
s6, mounting a steel purlin 28 on the lattice column 27; chiseling off the scum part on the enclosure structure 3 to ensure that the top surface of the enclosure structure 3 is flat;
s7, hoisting the whole assembly type steel pipe concrete support, lowering the assembly type steel pipe concrete support to a design position, enabling the middle part of the assembly type steel pipe concrete support to be supported on the steel enclosing purlin 28, enabling the supporting legs 30 at the two ends to be respectively supported on the enclosure structures 3 at the two sides, and adjusting to a design elevation; at the moment, the whole support forms a three-point support stable system;
s8, pouring the crown beam 2, pouring the anchor bolt 17, the support steel plate 29 and the support leg 30 into the crown beam 2, and maintaining to the designed strength;
s9, 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 applying pressure through a control system to enable the pressure of the jack 22 to reach a design value;
and S10, tightening the bolts 11 in the oblong bolt holes 26, fixing the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and connecting the assembled concrete-filled steel tube support and the steel purlin 28.
In the embodiment, the assembled concrete-filled steel tube support, the telescopic connecting pieces (the first end steel plate 18, the first U-shaped steel plate 20, the second end steel plate 32 and the second U-shaped steel plate 21) connected with the end parts of the assembled concrete-filled steel tube support and the supporting components (the supporting legs 30, the supporting steel plates 29 and the anchor bolts 17) are assembled and then are placed to the specified positions, and when the crown beam 2 is constructed, the supporting legs 30 and the anchor bolts 17 can be directly poured into the crown beam 2, so that the node strength of the assembled concrete-filled steel tube support and the crown beam 2 and the integrity of a supporting system are improved.
Between the concrete filled steel tube supports prefab 1 in this embodiment, concrete filled steel tube supports between prefab 1 and the second end steel sheet 32, all adopt bolted connection between first U-shaped steel sheet 20 and the second U-shaped steel sheet 21 and between first end steel sheet 18 and the supporting steel plate 29, realize the installation easily and dismantle, consequently, after foundation ditch engineering construction finishes, can demolish the bolt, realize concrete filled steel tube supports the recovery of prefab 1, but cyclic utilization many times simultaneously, and the cost is reduced.
Further, the concrete method for manufacturing the steel tube concrete support prefabricated member 1 in the step S1 includes:
s101, preparing a steel pipe 4, a joint steel plate 10, a spiral stirrup 8, a longitudinal bar 7, a stiffening plate 12, a joint inner lining pipe 14, a joint outer lining pipe 13 and an inner cladding pipe 15 according to a design drawing;
s102, 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;
s103, welding joint steel plates 10 at two ends of the steel pipe 4 respectively;
s104, welding a joint inner lining pipe 14 and a joint outer lining pipe 13 on the inner side and the outer side of two ends of the steel pipe 4 respectively, so that the joint inner lining pipe 14 and the joint outer lining pipe 13 are connected with the steel pipe 4 and the joint steel plate 10;
s105, connecting the joint steel plate 10 with the longitudinal ribs 7 through the perforation plug welding 23;
s106, 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 S107, filling concrete 6 into the steel pipe 4 and reserving the hollow part 9 to finish the manufacture of the steel pipe concrete support prefabricated part 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.
Because the concrete 6 in the center of the steel tube 4 has limited contribution to the bearing capacity, integrity and rigidity of the member, the weight of the member can be obviously reduced without obviously reducing the bearing capacity of the member, and the member is convenient to mount, transport and dismount, the concrete-filled steel tube support prefabricated member 1 of the embodiment adopts a hollow structure form that the concrete 6 is filled in the steel tube 4. 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.
Further, the concrete-filled steel tube support prefabricated member 1 is spliced to form the fabricated concrete-filled steel tube support in step S2 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, bolts 11 are inserted into corresponding bolt holes in the adjacent joint steel plates 10 and screwed down, and the concrete filled steel tube supporting prefabricated parts 1 are sequentially connected to form the assembled concrete filled steel tube support.
The steel pipe concrete supports between prefab 1 of this embodiment through connecting a plurality of high-strength bolt connection on the steel sheet 10, connects steel sheet 10 and steel pipe 4 and can make wholly or weld to increase the steadiness of connecting steel sheet 10 and steel pipe 4 through stiffening plate 12, adopt joint interior bushing pipe 14 and joint outer liner pipe 13 to increase to pass power simultaneously, still will indulge muscle 7 and connect steel sheet 10 and pass through perforation plug welding 23 and be connected, the rigidity of middle node structure can guarantee completely.
The steel pipe 4, the joint steel plate 10, the first end steel plate 18, the second end steel plate 32, the first U-shaped steel plate 20, the second U-shaped steel plate 21, the stiffening plate 12 and other steel structures adopted in the support system of the embodiment all have the outer sides coated with the anticorrosive coatings in advance, so that the steel structures are prevented from rusting and damaging, and the strength is reduced.
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 (7)
1. The utility model provides an assembled steel pipe concrete braced system which characterized in that: the concrete-filled steel tube support comprises a building envelope and an assembled concrete-filled steel tube support; the top of the enclosure structure is provided with a crown beam, the assembled concrete-filled steel tube support is supported between two opposite sides of the crown beam, and the assembled concrete-filled steel tube support is formed by splicing a plurality of prefabricated concrete-filled steel tube supports; and supporting components are arranged in the crown beam, and two ends of the assembled concrete-filled steel tube support are connected with two sides of the supporting components through telescopic connecting pieces respectively.
2. An assembled concrete filled steel tube support system as claimed in claim 1, wherein: the supporting assembly comprises a supporting steel plate and supporting legs, one side of the supporting steel plate is connected with the supporting legs and is reinforced through stiffening plates, and the other side of the supporting steel plate is connected with the telescopic connecting piece.
3. An assembled concrete filled steel tube support system as claimed in claim 1 or 2, wherein: the telescopic connecting piece comprises a first end steel plate, a first U-shaped steel plate, a second end steel plate and a second U-shaped steel plate; the first U-shaped steel plate is welded on the first end steel plate, and the first end steel plate is fixed with the support assembly; the second U-shaped steel plate is welded on the second end steel plate, and the second end steel plate is fixed with the end part of the assembled concrete-filled steel tube support; the first U-shaped steel plate and the second U-shaped steel plate are both provided with a plurality of rows of long round bolt holes, and the long round bolt holes in the first U-shaped steel plate and the second U-shaped steel plate are connected through bolts.
4. An assembled concrete filled steel tube support system as claimed in claim 3, wherein: the first U-shaped steel plate and the second U-shaped steel plate are connected to form a U-shaped groove, a jack connected with a control system is arranged in the U-shaped groove, and the front end and the rear end of the jack are respectively abutted to the second end steel plate and the first end steel plate.
5. An assembled concrete filled steel tube support system as claimed in claim 1, wherein: 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; the telescopic connecting piece is connected with the joint steel plate at the end part of the assembled concrete-filled steel tube support.
6. An assembled concrete filled steel tube support system as claimed in claim 5, 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; the joint steel plate is welded with the steel pipe, the inner side of the joint steel plate is located in the steel pipe, and the outer side of the joint steel plate is located outside the steel pipe and is provided with the bolt hole.
7. An assembled concrete filled steel tube support system as claimed in claim 1, wherein: the steel enclosing purlin is arranged on the lattice column and connected with the assembly type concrete-filled steel tube support.
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| CN202021564254.3U CN212336046U (en) | 2020-07-31 | 2020-07-31 | Assembled concrete-filled steel tube support system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112030990A (en) * | 2020-07-31 | 2020-12-04 | 中铁第四勘察设计院集团有限公司 | Assembled concrete-filled steel tube supporting system and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112030990A (en) * | 2020-07-31 | 2020-12-04 | 中铁第四勘察设计院集团有限公司 | Assembled concrete-filled steel tube supporting system and construction method thereof |
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