CN112030986A - Combined steel pipe concrete waist beam structure, prefabricated member, connecting joint and construction method - Google Patents
Combined steel pipe concrete waist beam structure, prefabricated member, connecting joint and construction method Download PDFInfo
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- CN112030986A CN112030986A CN202010760534.XA CN202010760534A CN112030986A CN 112030986 A CN112030986 A CN 112030986A CN 202010760534 A CN202010760534 A CN 202010760534A CN 112030986 A CN112030986 A CN 112030986A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 599
- 239000010959 steel Substances 0.000 title claims abstract description 599
- 239000004567 concrete Substances 0.000 title claims abstract description 253
- 238000010276 construction Methods 0.000 title claims abstract description 37
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims description 40
- 239000011178 precast concrete Substances 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 239000003351 stiffener Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011372 high-strength concrete Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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Abstract
The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a steel tube concrete waist beam prefabricated part which comprises a steel tube, wherein concrete is filled in the steel tube, and a hollow part which penetrates through the concrete along the axial direction is formed in the concrete; a steel reinforcement framework is arranged in the concrete; two ends of the steel pipe are welded with annular end steel plates, the end steel plates are connected with the steel reinforcement framework, and the end steel plates are partially positioned outside the steel pipe; two sides of one surface of the steel pipe are respectively welded with an expanded connecting steel plate for connecting with the enclosure structure; the invention also provides a combined concrete filled steel tube wale structure, a connecting node of the combined concrete filled steel tube wale structure and a concrete filled steel tube support, a construction method of the prefabricated member of the concrete filled steel tube wale and a construction method of the connecting node of the combined concrete filled steel tube wale structure and the concrete filled steel tube support. The invention can improve the bearing capacity, the anti-deformation capacity, the integrity, the middle node strength and the strength of the connection node between the middle node strength and the concrete filled steel tube support of the combined concrete filled steel tube waist beam.
Description
Technical Field
The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a combined concrete-filled steel tube waist beam, a prefabricated member, a connecting joint and a construction method.
Background
The traditional cast-in-place concrete support has the advantages of high rigidity, good integrity, safety, reliability and the like, is generally applied to foundation pit supporting engineering, but has the following outstanding disadvantages: (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.
Traditional steel pipe props the dead weight light, easily retrieves, construction convenience, nevertheless also has following outstanding drawback: (1) only pressure exists between the supporting and retaining structure of the foundation pit, and the overall performance is poor; (2) the steel pipe support needs to be prestressed in advance, so that the steel pipe support is ensured to be fully attached to the enclosure structure, but the prestress which cannot meet the design requirement is tasted in the field construction, so that potential safety hazards exist; (3) the steel pipe props the degree of reliability of being connected that encloses the purlin with the steel and receives construction quality influence degree very big, and the steel pipe props the anti-drop and only relies on single reinforcing bar to suspend in midair, and the security is difficult to obtain guaranteeing.
The traditional steel purlin (steel waist rail) is composed of double-spliced I-shaped steel which is suspended by reinforcing steel bars and supported by brackets, has poor integrity, has instability under the action of horizontal force transmitted by inclined supports, and is a common cause in foundation pit accidents at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the combined concrete filled steel tube wale, the prefabricated member, the connecting node and the construction method, which can improve the bearing capacity, the deformation resistance, the integrity, the middle node strength and the strength of the connecting node with the concrete filled steel tube support of the combined concrete filled steel tube wale.
In order to achieve the purpose, the technical scheme of the invention is that the steel tube concrete waist beam prefabricated part comprises a steel tube, an end steel plate and an expansion connecting steel plate, wherein concrete is filled in the steel tube, and a hollow part which penetrates through the concrete along the axial direction is arranged in the concrete; a steel reinforcement framework is arranged in the concrete; annular end steel plates are welded at two ends of the steel pipe and are connected with the steel reinforcement framework, and the end steel plates are partially positioned outside the steel pipe; and the two sides of one surface of the steel pipe are respectively welded with an expanded connecting steel plate for being connected with the enclosure structure.
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 end steel plate.
Furthermore, both ends of the inner side of the concrete are provided with inner wrapping pipes, and the inner wrapping pipes are welded with the end 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.
The invention also provides a combined concrete-filled steel tube waist beam structure, which comprises a combined concrete-filled steel tube waist beam and a waist beam bracket; the combined concrete-filled steel tube waist beam is formed by splicing a plurality of the concrete-filled steel tube waist beam prefabricated parts, a plurality of bolt holes are formed in end steel plates at two ends of each concrete-filled steel tube waist beam prefabricated part, and corresponding bolt holes in adjacent end steel plates of the adjacent concrete-filled steel tube waist beam prefabricated parts are respectively connected through bolts; the expanded connecting steel plates on the two sides of the precast member of the concrete filled steel tube waist beam are respectively and fixedly connected with the enclosure structure; the precast concrete filled steel tube wale is arranged on the wale bracket, and the wale bracket is fixedly connected with the enclosure structure.
Further, the wale bracket comprises a wale bracket stiffening rib, a wale bracket embedded steel plate and a wale bracket supporting steel plate; the waist beam bracket embedded steel plate is fixed on the inner wall of the enclosure structure and is connected with an anchor bolt in the enclosure structure; one end of the waist rail bracket supporting steel plate is welded with the waist rail bracket pre-embedded steel plate, and the bottom surface of the waist rail bracket supporting steel plate is connected with the waist rail bracket pre-embedded steel plate through the waist rail bracket supporting steel plate; the precast concrete filled steel tube wale is arranged on the wale bracket supporting steel plate.
The invention also provides a connecting node of the combined concrete-filled steel tube wale structure and the concrete-filled steel tube support, which comprises the concrete-filled steel tube support and the combined concrete-filled steel tube wale structure; the end part of the concrete-filled steel tube support is provided with a joint steel plate, a first U-shaped steel plate is welded on the joint steel plate, and a second U-shaped steel plate is welded at the position, connected with the concrete-filled steel tube support, of the steel tube; the first U-shaped steel plate and the second U-shaped steel plate are both provided with multiple rows of long round bolt holes, 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.
Furthermore, a jack is arranged between the joint steel plate and the steel pipe, the front end and the rear end of the jack are respectively abutted to the joint steel plate and the steel pipe, and the jack is electrically connected with a control system.
The invention also provides a construction method of the steel tube concrete waist beam prefabricated part, which comprises the following steps:
s11, preparing a steel pipe, an end steel plate, a steel bar framework, a stiffening plate, a joint inner lining pipe, a joint outer lining pipe and an inner wrapping pipe according to a design drawing;
s12, reserving studs on the inner wall of the steel pipe during manufacturing of the steel pipe, and arranging a steel reinforcement framework in the steel pipe;
s13, respectively welding end steel plates at two ends of the steel pipe;
s14, welding a joint inner lining pipe and a joint outer lining pipe on the inner side and the outer side of the two ends of the steel pipe respectively, so that the joint inner lining pipe and the joint outer lining pipe are connected with the steel pipe and the end steel plate together;
s15, connecting the end steel plate with the steel bar framework through perforation plug welding;
s16, placing the inner tube with the outer wall provided with the meshing teeth on the inner side of the steel bar framework, and welding the inner tube with the end steel plate; welding the stiffening plate to enable one end of the stiffening plate to be welded on the joint outer liner pipe and one end of the stiffening plate to be welded on the end steel plate;
s17, welding expanded connecting steel plates for connecting with the enclosure structure on two sides of one surface of the steel pipe respectively;
and S18, filling concrete in the steel pipe and reserving the hollow part to finish the manufacture of the precast member of the concrete filled steel pipe waist beam.
The invention also provides a construction method of the connection node of the combined concrete filled steel tube wale structure and the concrete filled steel tube support, which comprises the following steps:
s1, manufacturing a steel tube concrete waist rail prefabricated part by adopting the construction method;
s2, when the enclosure structure is constructed, pre-embedding bolts, anchor bolts and a pre-embedding steel plate of a waist rail bracket on the enclosure structure; after the excavation is carried out to a specified depth, welding a waist beam bracket supporting steel plate on the waist beam bracket embedded steel plate, and welding a waist beam bracket stiffening rib to enable one side of the waist beam bracket supporting steel plate to be welded on the bottom surface of the waist beam bracket supporting steel plate and one side of the waist beam bracket stiffening rib to be welded on the waist beam bracket embedded steel plate, thereby completing the construction of the waist beam bracket;
s3, conveying the steel pipe concrete waist beam prefabricated part to a construction site, placing the steel pipe concrete waist beam prefabricated part on a waist beam bracket supporting steel plate of a waist beam bracket, screwing a nut to connect an expansion connecting steel plate and an embedded bolt, and welding a stiffening plate to complete the connection of the steel pipe concrete waist beam prefabricated part and a building enclosure;
s4, repeating the step S3 until the connection between the precast concrete filled steel tube wale of each section and the envelope is completed;
s5, inserting bolts into corresponding bolt holes in the adjacent end steel plates of the two adjacent steel pipe concrete waist beam prefabricated members and screwing the bolts tightly to complete connection between the steel pipe concrete waist beam prefabricated members and the steel pipe concrete waist beam prefabricated members;
and S6, welding a first U-shaped steel plate on a joint steel plate at the end part of the concrete-filled steel tube support, welding a second U-shaped steel plate on a position, used for supporting and connecting the concrete-filled steel tube, on a steel tube of the concrete-filled steel tube waist beam prefabricated part, aligning the first U-shaped steel plate with the second U-shaped steel plate, placing a jack in a U-shaped groove formed by the first U-shaped steel plate and the second U-shaped steel plate, pressurizing to enable the pressure of the jack to reach a designed value, inserting a bolt into a long round bolt hole corresponding to the first U-shaped steel plate and the second U-shaped steel plate, and screwing, thereby completing construction of the connection node of the concrete-filled steel tube support and the combined concrete-filled steel tube waist beam structure.
Compared with the prior art, the invention has the following beneficial effects:
(1) the precast member of the steel tube concrete waist beam is a hollow member filled with concrete in a steel tube, so that the weight of the precast member can be greatly reduced, the transportation, the installation and the recycling of the member are convenient, and the compression strength of the filled concrete can be obviously improved under the action of the hoop of the outer steel tube, so that the precast member of the steel tube concrete waist beam has higher bearing capacity and stronger deformation resistance;
(2) the combined concrete-filled steel tube waist beam is formed by splicing a plurality of concrete-filled steel tube waist beam prefabricated parts, is convenient to construct, mount and dismount, and is convenient for factory production and large-area popularization and application; the combined steel pipe concrete waist is supported on the waist beam bracket and is connected with the enclosure structure through the expanded connecting steel plate, so that the stability of the combined steel pipe concrete waist beam is improved;
(3) according to the invention, multiple rows of long circular bolt holes are respectively arranged on the first U-shaped steel plate at the end part of the concrete filled steel tube support and the second U-shaped steel plate at the inner side of the combined concrete filled steel tube waist beam, and then the concrete filled steel tube support and the combined concrete filled steel tube waist beam are connected by the bolts penetrating through the long circular bolt holes, so that the requirements of rigid connection and equal-strength connection of end part nodes can be met, the engineering safety is ensured, and meanwhile, the deflection can be adjusted according to the requirements, and the construction error can be adjusted;
(4) according to the invention, the jack is arranged between the end part of the concrete-filled steel tube support and the inner side of the combined concrete-filled steel tube waist beam, so that prestress can be applied according to the requirement in the use process of the concrete-filled steel tube support, the requirement of repeated loading for prestress loss and support relaxation is met, and early warning can be timely carried out when overlarge stress occurs, so that the local instability of the foundation pit is prevented, and the damage to the whole foundation pit is prevented.
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 provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a concrete filled steel tube wale preform according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a connection node of a composite concrete filled steel tube wale structure and a concrete filled steel tube support according to an embodiment of the present invention;
FIG. 4 is a side view of a connection node of a composite concrete filled steel tube wale structure and a concrete filled steel tube support according to an embodiment of the present invention;
FIG. 5 is a schematic view illustrating the connection between a first U-shaped steel plate and a joint steel plate according to an embodiment of the present invention;
FIG. 6 is a side view of a second U-shaped steel plate according to an embodiment of the present invention;
FIG. 7 is a view A-A of FIG. 4;
FIG. 8 is a view B-B of FIG. 7;
FIG. 9 is a view C-C of FIG. 7;
FIG. 10 is a schematic view of a concrete filled steel tube wale preform joined to a concrete filled steel tube wale preform according to an embodiment of the present invention;
FIG. 11 is a schematic view of a steel header plate according to an embodiment of the present invention;
FIG. 12 is a schematic view of a wale bracket according to an embodiment of the present invention;
in the figure: 1. supporting the steel pipe concrete; 2. combining the steel pipe concrete waist 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. embedding bolts in advance; 18. expanding the connecting steel plate; 19. an anchor bolt; 20. a first U-shaped steel plate; 21. a second U-shaped steel plate; 22. the waist beam is connected with a stiffening rib; 23. a jack; 24. plug welding of the through hole; 25. a control system; 26. a wire; 27. a long round bolt hole; 28. A grouting pipe; 29. end steel plates; 30. a wale bracket stiffener; 31. pre-burying a steel plate in the waist rail bracket; 32. the wale bracket supports the steel plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Example one
As shown in fig. 2 and 7, the present embodiment provides a concrete filled steel tube wale preform, which includes a steel tube 4, an end steel plate 29 and an expansion connection steel plate 18, wherein the steel tube 4 is filled with concrete 6, and a hollow portion 9 penetrating through the concrete 6 in an axial direction is provided in the steel tube 6; a steel reinforcement framework is arranged in the concrete 6; two ends of the steel pipe 4 are welded with annular end steel plates 29, the end steel plates 29 are connected with the steel reinforcement framework, and the end steel plates 29 are partially positioned outside the steel pipe 4; and the two sides of one surface of the steel pipe 4 are respectively welded with an extended connecting steel plate 18 for connecting with the enclosure structure 3. The hollow component of the concrete filled steel tube wale prefab for the steel tube 4 infilled concrete 6 of this embodiment, can the advantage of two kinds of materials of full play steel and concrete, utilize the cuff effect of steel tube 4 to make the concrete 6 of infilling be in the side pressure state, can show the compressive strength who promotes concrete 6, simultaneously because the existence of concrete 6, the rigidity of steel tube 4 has been improved, make the bearing capacity (intensity) of hollow concrete filled steel tube wale prefab high, the resistance to deformation ability (rigidity) is strong, the whole can reach or even surpass the concrete wale, the degree of safety requirement of steel wale (steel purlin), and simultaneously, the light is high-strength, the prefabricated component of being convenient for recycles, be convenient for transportation and installation, economic nature is also higher than traditional concrete wale, steel wale (steel purlin). In addition, in this embodiment, the steel reinforcement framework in the concrete 6 is connected with the end steel plate 29, so as to further increase the integrity of the precast concrete filled steel tube wale.
In the embodiment, the steel pipe 4 is an outer skin of the prefabricated support, so that the concrete 6 filled in the steel pipe can be protected from being damaged, and the prefabricated part can be recycled for multiple times; the section of the steel pipe 4 can be square or polygonal, 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 end steel plate 29 can be a square flange, the part of the end steel plate 29 extending out of the steel tube 4 can be used for connecting the concrete filled steel tube wale prefabricated member with the concrete filled steel tube wale prefabricated member, and the end steel plate 29 and the steel tube 4 can be prefabricated into a whole or can be welded into a whole after being prefabricated in a split mode; the expansion connecting steel plates 18 can be welded on one side, close to the enclosure structure 3, of the steel pipe 4 at certain intervals, holes for connecting embedded bolts 17 embedded in the enclosure structure are reserved in the expansion connecting steel plates 18, the expansion connecting steel plates 18 and the steel pipe 4 are directly manufactured into a whole in a factory, the connection rigidity between the expansion connecting steel plates 18 and the steel pipe 4 can be increased through the stiffening plates 12, and the size and the thickness of the stiffening plates 12 are controlled according to calculation and size requirements.
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 end steel plate 29. As shown in fig. 10, 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 two ends 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 end steel plate 29, so that a weak stress link at the joint of the end steel plate 29 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 not too long, and the stress transition of the joint is met.
Further, the end steel plate 29 extending out of the steel pipe 4 is connected to the joint outer liner 13 through a stiffener 12. As shown in fig. 7 and 10, in the present embodiment, the stiffness of the connection between the end steel plate 29 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, the stiffening plates 12 may be provided in a plurality and spaced as shown in fig. 9, and may have a thickness of 10-20mm, and the size is determined according to the stress, and the surplus is reserved.
Further, both ends of the inner side of the concrete 6 are provided with inner wrapping pipes 15, and the inner wrapping pipes 15 are welded with the end steel plates 29; 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. 10, in this embodiment, the inner cladding pipe 15 is welded to the end steel plate 29 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 precast concrete filled steel tube wale is further improved. The wall thickness of the inner tube 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 end steel plate 29 is required; 8-12 meshing teeth 16 are uniformly arranged along the circumferential direction, the meshing teeth 16 are square, the side length is 30-50mm, the thickness is the same as that of the inner packing tube 15, and the inner packing concrete 6 is recessed to realize the tight meshing of the meshing teeth and the inner packing concrete.
Further, the framework of steel reinforcement includes spiral stirrup 8 and many vertical bars 7, and many vertical bars 7 are followed spiral stirrup 8's inboard interval arrangement and all with spiral stirrup 8 is connected. As shown in fig. 2 and 10, 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 end steel plate 29 through the perforation plug welding 24, the end steel plate 29 is inwards concave and anchored in the concrete 6, the end steel plate 29 and the concrete 6 are effectively integrated, and the connection strength and rigidity of the end steel plate 29 and the concrete filled steel tube are enhanced.
Furthermore, a plurality of studs 5 are welded on the inner wall of the steel pipe 4, and the studs 5 are embedded in the concrete 6. As shown in fig. 2, in this embodiment, the stud 5 may be welded on the surface of the steel strip before the steel pipe 4 is manufactured, and when the steel pipe 4 is manufactured, the stud 5 is located on the inner wall of the steel pipe 4, and the stud 5 is embedded in the concrete 6, so as to increase the reliable connection between the steel pipe 4 and the internal concrete 6; the number of the pegs 5 is preferably 8-12 per circle, and the length is preferably 20mm-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 concrete 6 into a whole, so that the concrete-filled steel pipe prefabricated part has high strength and high rigidity, is not easy to damage in the use process, and can be recycled for multiple times.
Further, as shown in fig. 7, the steel pipe 4 of the present embodiment is provided with a grouting pipe 28 for pouring concrete 6 into the steel pipe 4.
Example two
As shown in fig. 7 to 10, the present embodiment provides a composite concrete filled steel tube wale structure including a composite concrete filled steel tube wale 2 and a wale bracket; the combined concrete filled steel tube wale 2 is formed by splicing a plurality of prefabricated parts of the concrete filled steel tube wale provided by the first embodiment, a plurality of bolt holes are formed in end steel plates 29 at two ends of the prefabricated parts of the concrete filled steel tube wale, and corresponding bolt holes in adjacent end steel plates 29 of the adjacent prefabricated parts of the concrete filled steel tube wale are respectively connected through bolts 11; the expanded connecting steel plates 18 on the two sides of the precast concrete filled steel tube wale are respectively and fixedly connected with the enclosure structure 3; the precast concrete filled steel tube wale is arranged on the wale bracket, and the wale bracket is fixedly connected with the envelope 3. The combination steel pipe concrete waist rail 2 of this embodiment adopts a plurality of steel pipe concrete waist rail prefabricates to splice and form, realize rigid connection and design of waiting strong between steel pipe concrete waist rail prefabricate and the steel pipe concrete waist rail prefabricate through bolt 11 and end steel sheet 29, reach the similar even higher intensity and rigidity of cast in situ concrete waist rail, steel waist rail, guarantee the safety and stability of foundation ditch engineering, and the installation with dismantle the facility, be convenient for batch production preparation and large tracts of land popularization and application. The combined steel pipe concrete waist beam structure of the embodiment can be recycled for many times, has short construction period, high quality and simple construction compared with the traditional concrete waist beam, and has good integrity, large rigidity, safety and reliability compared with the traditional steel waist beam.
The steel tube concrete waist beam prefabricated part can be provided with a plurality of fixed modulus sections with proper lengths according to needs, the length is not too long, otherwise hoisting construction is difficult, and the length is not too short, otherwise joints are too many and connection is difficult; as an implementation mode, the middle-section prefabricated components can be designed into standard modules with the specifications of 4m, 5m, 6m and the like, the end-section prefabricated components can be designed into standard modules with the specification of 2m, and the steel pipe concrete waist beam prefabricated components with the completely same, incompletely 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.
The bolt 11 of the embodiment can be a high-strength bolt or a mechanical bolt, and the stress requirement can be met; in this embodiment, one row or multiple rows of bolt holes may be formed in the end steel plate 29 according to the manner shown in fig. 11, the corresponding bolt holes in the adjacent end steel plates 29 are all connected rigidly by the bolts 11, and the stiffening plate 12 is welded between every two rows of bolts 11, as shown in fig. 9, so that the rigid connection of the middle node is ensured, the equal-strength connection between the node and the member is realized, and the safety and stability of the foundation pit engineering are ensured.
In this embodiment, a plurality of embedded bolts 17 are embedded in positions of the envelope 3 for connecting with the expansion connection steel plates 18, bolt holes are reserved in the expansion connection steel plates 18 correspondingly, and the steel pipe concrete waist beam prefabricated member is fixedly connected with the envelope by installing the bolt holes of the expansion connection steel plates 18 on the embedded bolts 17 correspondingly and tightening nuts.
Further, as shown in fig. 7 and 12, the wale bracket includes a wale bracket stiffener 30, a wale bracket pre-buried steel plate 31, and a wale bracket support steel plate 32; the waist rail bracket embedded steel plate 31 is fixed on the inner wall of the building enclosure 3 and is connected with an anchor bolt 19 in the building enclosure 3; one end of the wale bracket supporting steel plate 32 is welded with the wale bracket pre-embedded steel plate 31, and the bottom surface of the wale bracket supporting steel plate 32 is connected with the wale bracket pre-embedded steel plate 31 through the wale bracket supporting steel plate 32; the precast concrete filled steel tube wale is arranged on the wale bracket supporting steel plate 32, so that the stability of the combined concrete filled steel tube wale is improved.
EXAMPLE III
As shown in fig. 3 and 4, the present embodiment provides a connection node of a composite concrete filled steel tube wale structure and a concrete filled steel tube support, including the concrete filled steel tube support 1 and the composite concrete filled steel tube wale structure provided in the second embodiment; the end part of the concrete-filled steel tube support 1 is provided with a joint steel plate 10, a first U-shaped steel plate 20 is welded on the joint steel plate 10, and a second U-shaped steel plate 21 is welded at the position of the steel tube 4, which is used for being connected with the concrete-filled steel tube support 1; a plurality of rows of long round bolt holes 27 are formed in the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and the long round bolt holes 27 in the first U-shaped steel plate 20 are connected with the long round bolt holes 27 in the second U-shaped steel plate 21 through bolts 11. The multiple rows of long circular bolt holes 27 with adjustable positions are formed in the first U-shaped steel plate 20 and the second U-shaped steel plate 21 of the embodiment, as shown in fig. 5 and 6, the long circular bolt holes 27 are arranged along the supporting direction, the first U-shaped steel plate 20 is connected with the second U-shaped steel plate 21 through the long circular bolt holes 27 through bolts 11, rigid connection and equal-strength connection requirements of end nodes can be met through the variable-length circular hole steel box slot nodes, engineering safety is guaranteed, the combined steel pipe concrete waist beam 2 replaces a traditional concrete waist beam and a steel waist beam, assembly rate is improved, meanwhile, the length of a joint can be changed by adjusting the relative positions of the long circular bolt holes 27 according to requirements, and therefore errors in construction are eliminated.
Further, a jack 23 is arranged between the joint steel plate 10 and the steel pipe 4, the front end and the rear end of the jack 23 are respectively abutted against the joint steel plate 10 and the steel pipe 4, and the jack 23 is electrically connected with a control system 25. As shown in fig. 3, in this embodiment, a jack 23 is arranged between the joint steel plate 10 at the end of the concrete-filled steel tube support 1 and the steel tube 4 of the combined concrete-filled steel tube wale, and the jack 23 is connected with the control system 25 through a wire 26 to form an intelligent stress compensation device, so that prestress can be constructed as required, and the requirements of prestress loss and support relaxation that need repeated loading are met; in the use of the concrete filled steel tube support 1, stress compensation is timely carried out through the jack 23 if the stress relaxation phenomenon occurs, early warning is timely carried out if the stress is too large, and the local instability of the foundation pit is prevented to cause the damage of the whole foundation pit.
The jack 23 of the embodiment is an intelligent jack, has enough jacking force, can sense self stress and transmit the 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, the stress is automatically compensated; if the stress is too large and exceeds a designed early warning value, an alarm is automatically given; the jack 23 should not be oversized to prevent later difficulty in threading the bolt 11 through the oblong bolt hole 27.
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 23 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.
Further, as shown in fig. 3, the steel pipes 4 are connected to the joint steel plates 10 via the wale connection stiffeners 22, thereby increasing the connection rigidity of the concrete-filled steel pipe support 1 and the composite concrete-filled steel pipe wale 2.
Example four
As shown in fig. 3 and 4, the present embodiment provides a concrete-filled steel tube support, the concrete-filled steel tube support 1 is formed by splicing a plurality of concrete-filled steel tube support prefabricated members, and the lengths of the plurality of concrete-filled steel tube support prefabricated members are completely the same, not completely the same or completely different. The concrete filled steel tube supporting prefabricated part 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 lengths; as an implementation mode, the middle-section prefabricated parts can be designed into standard modules with the specifications of 4m, 5m, 6m and the like, the end-section prefabricated parts can be designed into standard modules with the specification of 2m, and steel pipe concrete support prefabricated parts with the completely same, incompletely 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.
The concrete-filled steel tube support prefabricated member in the embodiment can adopt a hollow structural form of concrete filled in a steel tube, and particularly can adopt the structural form of the concrete-filled steel tube waist beam prefabricated member provided in the first embodiment, and is characterized in that the steel tube and the end steel plate can also be round, and the outer side of the steel tube does not need to be welded with the expanded connection steel plate 18 and a stiffening plate used for being connected with the expanded connection steel plate 18; the steel pipe concrete support prefabricated members are connected through end steel plates 29 and bolts.
EXAMPLE five
As shown in fig. 1, the present embodiment provides a support system, which includes a building envelope 3, a concrete-filled steel tube support, and a composite concrete-filled steel tube wale structure provided in the second embodiment; the inboard of envelope 3 is equipped with a plurality of combination steel pipe concrete wale structures along the direction of height, and supports between the relative both sides of combination steel pipe concrete wale has the steel pipe concrete to support, and the node between steel pipe concrete support and the combination steel pipe concrete wale all adopts the connected node that embodiment three provided.
The supporting system further comprises a crown beam arranged at the top of the envelope structure 3, a concrete-filled steel tube support is also supported between the two opposite sides of the crown beam, and the joint between the crown beam and the concrete-filled steel tube support can also adopt the joint provided by the third embodiment, and the difference lies in that the combined concrete-filled steel tube waist beam structure is replaced by the crown beam, and meanwhile, a steel plate is embedded in the inner side of the crown beam and a second U-shaped steel plate 21 is welded on the embedded steel plate.
The concrete filled steel tube support in the present embodiment may adopt the concrete filled steel tube support 1 provided in the fourth embodiment.
EXAMPLE six
As shown in fig. 2, 7 and 10, the present embodiment provides a method for constructing a precast concrete filled steel tube wale, including the steps of:
s11, preparing a steel pipe 4, an end steel plate 29, a steel reinforcement framework, a stiffening plate 12, a joint inner lining pipe 14, a joint outer lining pipe 13 and an inner packing pipe 15 according to a design drawing;
s12, reserving studs 5 on the inner wall of the steel pipe 4 during manufacturing, and configuring a steel reinforcement framework in the steel pipe 4;
s13, welding end steel plates 29 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 end steel plate 29 together;
s15, connecting the end steel plate 29 with the steel reinforcement framework through the perforation plug welding 24;
s16, placing the inner tube 15 with the outer wall provided with the meshing teeth 16 on the inner side of the steel bar framework, and welding the inner tube with the end steel plate 29; welding the stiffening plate 12 to enable one end of the stiffening plate to be welded on the joint outer liner pipe 13 and one end of the stiffening plate to be welded on the end steel plate 29;
s17, welding expanded connecting steel plates 18 used for being connected with the enclosure structure 3 on two sides of one surface of the steel pipe 4 respectively;
and S18, filling concrete 6 in the steel pipe 4 and reserving the hollow part 9 to finish the manufacture of the steel pipe concrete waist beam prefabricated part.
In the method for manufacturing the precast member for the concrete filled steel tube wale, the end steel plate 29 and the steel tube 4 are directly prefabricated into a whole, as another embodiment, the end steel plate 29 and the steel tube 4 can be prefabricated separately and then connected into a whole, specifically, after the steel tube 4 is manufactured, a steel reinforcement framework is firstly configured in the steel tube 4, then the joint inner lining pipe 14 and the joint outer lining pipe 13 are welded respectively at the inner side and the outer side of both 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 bar 7 of the steel reinforcement framework through a perforation plug welding 24, then the inner side of the annular steel plate is welded with an inner wrapping pipe 15, then the two sides of one surface of the steel pipe 4 are respectively welded with an extended connecting steel plate 18 used for being connected with the enclosure structure 3, then filling concrete 6 in the steel pipe 4 and reserving a hollow part 9 to finish the prefabrication of the steel pipe concrete part; 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 wrapping pipe 15 with the end steel plate 29, 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 end steel plate 29, and connecting the prefabricated steel pipe concrete part and the end steel plate 29 into a whole to finish the manufacturing of the steel pipe concrete waist beam prefabricated part.
In the embodiment, on the premise of ensuring the bearing capacity and the deformation resistance, the concrete 6 is of a hollow section, because the concrete in the center of the steel pipe has limited contribution to the bearing capacity, integrity and rigidity of the member, the bearing capacity of the member is not obviously reduced, but the weight of the prefabricated member can be obviously reduced, and the prefabricated member is more convenient to mount, transport and dismount; the embodiment can adopt the centrifugal process to pack concrete 6 in steel pipe 4, can form inside hollow automatically, and can regard steel pipe 4 as centrifugal process's exterior sheathing, need not to demolish, simultaneously, compares in conventional cast-in-place vibration technology, and centrifugal process conveniently realizes the high-strength concrete for hollow steel pipe concrete waist rail prefab's bearing capacity and anti deformability are higher, the durability is better.
EXAMPLE seven
As shown in fig. 3 and 4, the present embodiment provides a construction method for a connection node of a combination concrete filled steel tube wale structure and a concrete filled steel tube support 1, including the following steps:
s1, manufacturing a steel tube concrete wale prefabricated member by adopting the construction method provided by the first embodiment;
s2, when the building envelope 3 is constructed, determining the position of the embedded bolts 17, the anchor bolts 19 and the waist rail bracket embedded steel plates 31 on the building envelope 3; after the excavation is carried out to a specified depth, welding a waist beam bracket supporting steel plate 32 on the waist beam bracket embedded steel plate 31, and welding a waist beam bracket stiffening rib 30 to enable one side of the waist beam bracket supporting steel plate 32 to be welded on the bottom surface and one side of the waist beam bracket reinforcing rib to be welded on the waist beam bracket embedded steel plate 31, thereby completing the construction of the waist beam bracket;
s3, conveying the precast concrete-filled steel tube wale to a construction site, placing the precast concrete-filled steel tube wale on a wale bracket supporting steel plate 32 of a wale bracket, screwing a nut to connect an expansion connecting steel plate 18 and an embedded bolt 17, welding a stiffening plate 12 to connect the expansion connecting steel plate 18 and a steel tube 4, and completing the connection of the precast concrete-filled steel tube wale and the enclosure structure 3;
s4, repeating the step S3 until the connection between the precast concrete filled steel tube wale of each section and the envelope 3 is completed;
s5, inserting bolts 11 into corresponding bolt holes in the adjacent end steel plates 29 of the two adjacent steel tube concrete wale prefabricated members and screwing the bolts to complete connection between the steel tube concrete wale prefabricated members and the steel tube concrete wale prefabricated members;
s6, welding a first U-shaped steel plate 20 on a joint steel plate 10 at the end part of the concrete-filled steel tube support 1, welding a second U-shaped steel plate 21 on a position, used for connecting the concrete-filled steel tube support 1, on a steel tube 4 of the concrete-filled steel tube waist beam prefabricated member, centering the first U-shaped steel plate 20 and the second U-shaped steel plate 21, placing a jack 23 in a U-shaped groove formed by the first U-shaped steel plate 20 and the second U-shaped steel plate 21, pressurizing to enable the pressure of the jack 23 to reach a designed value, inserting a bolt 11 into a long round bolt hole 27 corresponding to the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and screwing, so that construction of the connection node of the concrete-filled steel tube support 1 and the combined concrete-filled steel tube waist beam structure is completed.
Because outside steel pipe 4 has the effect of dado in this embodiment, so the concrete filled steel tube waist rail prefab is difficult for receiving the damage, and all adopt bolted connection between the concrete filled steel tube waist rail prefab and between concrete filled steel tube waist rail prefab and the concrete filled steel tube support 1, realize dismantling easily, therefore, after foundation ditch engineering construction finishes, can demolish the bolt between concrete filled steel tube waist rail prefab and the concrete filled steel tube support 1 and between the concrete filled steel tube waist rail prefab, realize the recovery of concrete filled steel tube waist rail prefab, but the multiple cycle utilizes simultaneously, and the cost is reduced.
The precast concrete filled steel tube wale in the embodiment is connected through a plurality of high-strength bolts on the end steel plate 29; the end steel plate 29 and the steel pipe 4 can be integrally manufactured or welded, the stability is increased through the stiffening plate 12, meanwhile, 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 end steel plate 29 through the perforated plug welding 24, and the rigidity of the middle connecting node can be completely guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a steel pipe concrete waist rail prefab which characterized in that: the concrete expansion joint comprises a steel pipe, an end steel plate and an expansion connecting steel plate, wherein concrete is filled in the steel pipe, and a hollow part which penetrates through the concrete along the axial direction is formed in the concrete; a steel reinforcement framework is arranged in the concrete; annular end steel plates are welded at two ends of the steel pipe and are connected with the steel reinforcement framework, and the end steel plates are partially positioned outside the steel pipe; and the two sides of one surface of the steel pipe are respectively welded with an expanded connecting steel plate for being connected with the enclosure structure.
2. A concrete filled steel tube wale preform according to claim 1, wherein: and the inner side and the outer side of the two ends of the steel pipe are respectively provided with a joint inner lining pipe and a joint outer lining pipe, and the joint inner lining pipe and the joint outer lining pipe are welded with the end steel plate.
3. A concrete filled steel tube wale preform according to claim 1, wherein: inner wrapping pipes are arranged at two ends of the inner side of the concrete and are welded with the end steel plates; and a circle of meshing teeth are arranged on the inner wrapping pipe and embedded into the concrete.
4. A concrete filled steel tube wale preform according to claim 1, wherein: and a plurality of studs are welded on the inner wall of the steel pipe and embedded into the concrete.
5. The utility model provides a combination steel pipe concrete waist rail structure which characterized in that: the combined steel pipe concrete waist beam comprises a combined steel pipe concrete waist beam and a waist beam bracket; the combined concrete filled steel tubular wale is formed by splicing a plurality of concrete filled steel tubular wale prefabricated members according to any one of claims 1 to 4, a plurality of bolt holes are formed in end steel plates at two ends of each concrete filled steel tubular wale prefabricated member, and corresponding bolt holes in adjacent end steel plates of adjacent concrete filled steel tubular wale prefabricated members are respectively connected through bolts; the expanded connecting steel plates on the two sides of the precast member of the concrete filled steel tube waist beam are respectively and fixedly connected with the enclosure structure; the precast concrete filled steel tube wale is arranged on the wale bracket, and the wale bracket is fixedly connected with the enclosure structure.
6. A composite concrete filled steel tube wale structure according to claim 5, wherein: the waist rail bracket comprises a waist rail bracket stiffening rib, a waist rail bracket embedded steel plate and a waist rail bracket supporting steel plate; the waist beam bracket embedded steel plate is fixed on the inner wall of the enclosure structure and is connected with an anchor bolt in the enclosure structure; one end of the waist rail bracket supporting steel plate is welded with the waist rail bracket pre-embedded steel plate, and the bottom surface of the waist rail bracket supporting steel plate is connected with the waist rail bracket pre-embedded steel plate through the waist rail bracket supporting steel plate; the precast concrete filled steel tube wale is arranged on the wale bracket supporting steel plate.
7. The utility model provides a connected node that combination steel pipe concrete waist rail structure and steel pipe concrete supported which characterized in that: comprising a concrete filled steel tube support and a composite concrete filled steel tube wale structure according to claim 5 or 6; the end part of the concrete-filled steel tube support is provided with a joint steel plate, a first U-shaped steel plate is welded on the joint steel plate, and a second U-shaped steel plate is welded at the position, connected with the concrete-filled steel tube support, of the steel tube; the first U-shaped steel plate and the second U-shaped steel plate are both provided with multiple rows of long round bolt holes, 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.
8. A joint of a composite concrete filled steel tube wale structure and concrete filled steel tube support according to claim 7, wherein: and a jack is arranged between the joint steel plate and the steel pipe, the front end and the rear end of the jack are respectively propped against the joint steel plate and the steel pipe, and the jack is electrically connected with the control system.
9. The construction method of the precast member of the steel tube concrete waist beam is characterized by comprising the following steps of:
s11, preparing a steel pipe, an end steel plate, a steel bar framework, a stiffening plate, a joint inner lining pipe, a joint outer lining pipe and an inner wrapping pipe according to a design drawing;
s12, reserving studs on the inner wall of the steel pipe during manufacturing of the steel pipe, and arranging a steel reinforcement framework in the steel pipe;
s13, respectively welding end steel plates at two ends of the steel pipe;
s14, welding a joint inner lining pipe and a joint outer lining pipe on the inner side and the outer side of the two ends of the steel pipe respectively, so that the joint inner lining pipe and the joint outer lining pipe are connected with the steel pipe and the end steel plate together;
s15, connecting the end steel plate with the steel bar framework through perforation plug welding;
s16, placing the inner tube with the outer wall provided with the meshing teeth on the inner side of the steel bar framework, and welding the inner tube with the end steel plate; welding the stiffening plate to enable one end of the stiffening plate to be welded on the joint outer liner pipe and one end of the stiffening plate to be welded on the end steel plate;
s17, welding expanded connecting steel plates for connecting with the enclosure structure on two sides of one surface of the steel pipe respectively;
and S18, filling concrete in the steel pipe and reserving the hollow part to finish the manufacture of the precast member of the concrete filled steel pipe waist beam.
10. A construction method for a connecting node of a combined concrete filled steel tube wale structure and a concrete filled steel tube support is characterized by comprising the following steps:
s1, manufacturing a concrete filled steel tube wale prefabricated member by the construction method according to claim 9;
s2, when the enclosure structure is constructed, pre-embedding bolts, anchor bolts and a pre-embedding steel plate of a waist rail bracket on the enclosure structure; after the excavation is carried out to a specified depth, welding a waist beam bracket supporting steel plate on the waist beam bracket embedded steel plate, and welding a waist beam bracket stiffening rib to enable one side of the waist beam bracket supporting steel plate to be welded on the bottom surface of the waist beam bracket supporting steel plate and one side of the waist beam bracket stiffening rib to be welded on the waist beam bracket embedded steel plate, thereby completing the construction of the waist beam bracket;
s3, conveying the steel pipe concrete waist beam prefabricated part to a construction site, placing the steel pipe concrete waist beam prefabricated part on a waist beam bracket supporting steel plate of a waist beam bracket, screwing a nut to connect an expansion connecting steel plate and an embedded bolt, and welding a stiffening plate to complete the connection of the steel pipe concrete waist beam prefabricated part and a building enclosure;
s4, repeating the step S3 until the connection between the precast concrete filled steel tube wale of each section and the envelope is completed;
s5, inserting bolts into corresponding bolt holes in the adjacent end steel plates of the two adjacent steel pipe concrete waist beam prefabricated members and screwing the bolts tightly to complete connection between the steel pipe concrete waist beam prefabricated members and the steel pipe concrete waist beam prefabricated members;
and S6, welding a first U-shaped steel plate on a joint steel plate at the end part of the concrete-filled steel tube support, welding a second U-shaped steel plate on a position, used for supporting and connecting the concrete-filled steel tube, on a steel tube of the concrete-filled steel tube waist beam prefabricated part, aligning the first U-shaped steel plate with the second U-shaped steel plate, placing a jack in a U-shaped groove formed by the first U-shaped steel plate and the second U-shaped steel plate, pressurizing to enable the pressure of the jack to reach a designed value, inserting a bolt into a long round bolt hole corresponding to the first U-shaped steel plate and the second U-shaped steel plate, and screwing, thereby completing construction of the connection node of the concrete-filled steel tube support and the combined concrete-filled steel tube waist beam structure.
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| CN113957904A (en) * | 2021-11-09 | 2022-01-21 | 中国路桥工程有限责任公司 | Steel pipe internal stay and steel waist beam magnetic force connecting and locking device |
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| CN210151752U (en) * | 2019-04-04 | 2020-03-17 | 广州市市政工程设计研究总院有限公司 | Foundation pit steel shoring |
| CN111395351A (en) * | 2020-02-25 | 2020-07-10 | 中铁第四勘察设计院集团有限公司 | Assembled supporting structure of foundation pit and supporting construction method |
| CN213062030U (en) * | 2020-07-31 | 2021-04-27 | 中铁第四勘察设计院集团有限公司 | Combined concrete filled steel tube waist beam structure, prefabricated member and connecting node |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113957904A (en) * | 2021-11-09 | 2022-01-21 | 中国路桥工程有限责任公司 | Steel pipe internal stay and steel waist beam magnetic force connecting and locking device |
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