CN112030988A - Assembled hollow steel tube concrete support system and construction method thereof - Google Patents

Abstract

The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to an assembly type hollow steel tube concrete support system and a construction method thereof, wherein the assembly type hollow steel tube concrete support system comprises an enclosure structure and an assembly type hollow steel tube concrete support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and assembled hollow steel pipe concrete supports are supported between two opposite sides of the waist beam and between two opposite sides of the crown beam; the assembled hollow steel pipe concrete support is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts, and hollow parts of the hollow steel pipe concrete support prefabricated parts are communicated; still be equipped with lattice column and steel in the envelope and enclose the purlin, be equipped with a plurality of steel along its direction of height on the lattice column and enclose the purlin, the steel encloses the purlin and is connected with assembled hollow steel pipe concrete support. The hollow parts of the plurality of hollow steel pipe concrete support prefabricated parts of the assembled hollow steel pipe concrete support are communicated, so that the assembled hollow steel pipe concrete support is higher in bearing capacity and higher in deformation resistance, and the safety of foundation pit engineering is ensured.

Description

Assembled hollow steel tube concrete support system and construction method thereof

Technical Field

The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to an assembled hollow steel tube concrete supporting system and a construction method thereof.

Background

Traditional cast in situ concrete supports, because of its rigidity is big, the wholeness is good, advantages such as safe and reliable, generally apply to underground works, nevertheless also have outstanding problem and shortcoming: (1) cost, high investment: concrete support belongs to temporary engineering, a main body of a station structure is finished, namely outward transportation is broken, the investment of temporary waste engineering is high, generally, underground stations are millions, complex stations are tens of millions, and the cost of complex stations is tens of millions; (2) time-consuming and long construction period: the concrete supporting and formwork erecting, steel bar binding, pouring and vibrating, maintenance and later-period removal are carried out, the whole process is long for several months, and the site construction progress is severely restricted. (3) Hard, the degree of difficulty is big: the concrete support construction difficulty is big, breaks the construction after using the completion, need consume a large amount of manpower and materials. (4) The concrete is not environment-friendly, the waste residues of the concrete are broken to pollute the environment, and the development direction of green construction, environmental protection and energy conservation is not met. Advanced products and scientific construction methods are urgently needed to replace the traditional concrete support.

Although traditional steel pipe props can retrieve, it is comparatively convenient to be under construction, but can only bear pressure between its and foundation ditch retaining structure, and the wholeness is relatively poor, and resistance to deformation ability is poor, becomes the weak link of foundation ditch safety.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide the assembly type hollow steel tube concrete support system and the construction method thereof, which can improve the bearing capacity and the deformation resistance of the assembly type hollow steel tube concrete support and the stability of the support system and ensure the safety of foundation pit engineering.

In order to achieve the purpose, the technical scheme of the invention is that the assembly type hollow steel tube concrete support system comprises an enclosure structure and an assembly type hollow steel tube concrete support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and the assembled hollow steel pipe concrete supports are supported between two opposite sides of the waist beam and between two opposite sides of the crown beam; the assembled hollow steel pipe concrete support is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts, and hollow parts of the hollow steel pipe concrete support prefabricated parts are communicated; the enclosure structure is characterized in that lattice columns and steel enclosing purlins are further arranged in the enclosure structure, a plurality of steel enclosing purlins are arranged on the lattice columns along the height direction of the lattice columns, and the steel enclosing purlins are connected with the assembled hollow steel pipe concrete supports.

Further, the hollow steel tube concrete support prefabricated member comprises a steel tube and a joint steel plate, 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; annular joint steel plates are welded at two ends of the steel pipe, the inner sides of the joint steel plates are positioned in the steel pipe, and the outer sides of the joint steel plates are positioned outside the steel pipe and are provided with a plurality of bolt holes along the annular direction; and corresponding bolt holes on adjacent joint steel plates of the adjacent hollow concrete-filled steel tube support prefabricated parts are respectively connected through bolts.

Furthermore, the inner side and the outer side of the two ends of the steel pipe are respectively provided with a joint inner lining pipe and a joint outer lining pipe, and the joint inner lining pipe and the joint outer lining pipe are welded with the joint steel plate.

Furthermore, the inner sides of two ends of the concrete are respectively provided with an inner wrapping pipe, and the inner wrapping pipes are welded with the joint steel plates; and a circle of meshing teeth are arranged on the inner wrapping pipe and embedded into the concrete.

Furthermore, a plurality of studs are welded on the inner wall of the steel pipe, and the studs are embedded in the concrete.

Further, a first U-shaped steel plate is fixed on the inner side of the crown beam or the waist beam, and a plurality of rows of long round bolt holes are formed in two side plates of the first U-shaped steel plate; a second U-shaped steel plate is fixed at the end part of the assembled hollow steel pipe concrete support, and a plurality of rows of long round bolt holes are formed in the two side plates of the second U-shaped steel plate; and the long round bolt holes in the two side walls of the first U-shaped steel plate are connected with the long round bolt holes in the two side walls of the second U-shaped steel plate through bolts.

Furthermore, one end of the first U-shaped steel plate is welded on a first end steel plate, and the first end steel plate is fixed on the inner side wall of the crown beam or the waist beam; the second U-shaped steel plate is welded on a second end steel plate, and the second end steel plate is connected with the end part of the assembled hollow steel tube concrete support; a jack is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate and the second U-shaped steel plate, and the front end and the rear end of the jack are respectively abutted against the second end steel plate and the first end steel plate; the jack is electrically connected with the control system.

Furthermore, a plurality of anchor bolts are pre-embedded in the crown beam and the waist beam, a plurality of anchor bolt holes are formed in the first end steel plate, one end of each anchor bolt extends out of the corresponding anchor bolt hole formed in the back of the crown beam or the waist beam and is fixed through a nut.

The invention also provides a construction method of the assembled hollow steel tube concrete support system, which comprises the following steps:

s1, manufacturing a hollow steel tube concrete support prefabricated part in a factory according to a design drawing, and constructing a building envelope and a lattice column;

s2, when constructing the crown beam and the wale, embedding anchor bolts on the crown beam and the wale, and enabling one ends of the anchor bolts to extend out of the inner sides of the crown beam or the wale;

s3, transporting the hollow steel tube concrete support prefabricated member to a construction site, and assembling the hollow steel tube concrete support prefabricated member into an assembly type hollow steel tube concrete support with a communicated hollow part through bolt connection;

s4, welding the first U-shaped steel plate and the first end steel plate, installing the first end steel plate on an anchor bolt pre-embedded on the crown beam or the waist beam, and fixing the first end steel plate through a nut;

s5, welding the second U-shaped steel plate and the second end steel plate, and connecting the second end steel plate and the end part of the fabricated hollow steel tube concrete support through a bolt;

s6, mounting steel purlins on the lattice columns, and constructing temporary supports at two ends of the foundation pit;

s7, aligning the first U-shaped steel plate and the second U-shaped steel plate, and placing a jack in a U-shaped groove formed by the first U-shaped steel plate and the second U-shaped steel plate; respectively supporting two ends of the assembled hollow steel pipe concrete support on temporary supports at two ends, and controlling the jack to pressurize through a control system to enable the jack pressure to reach a design value;

and S8, inserting bolts into the long round bolt holes corresponding to the first U-shaped steel plate and the second U-shaped steel plate, screwing the bolts, and connecting the assembled hollow steel tube concrete support with the steel purlin.

Further, the construction method of the temporary support in step S6 is: the base is constructed firstly, the steel leg support is embedded in the base, then the steel bracket with the groove in the upper surface is fixed on the steel leg support, and the bottom elevation of the groove in the upper surface of the steel bracket is the same as the top elevation of the steel purlin.

Compared with the prior art, the invention has the following beneficial effects:

(1) the assembled hollow steel tube concrete support adopted in the support system is formed by splicing a plurality of hollow steel tube concrete support prefabricated parts, so that the prefabricated parts can be recycled, and hollow parts of the hollow steel tube concrete support prefabricated parts are communicated, so that the assembled hollow steel tube concrete support has higher bearing capacity and stronger deformation resistance, and the safety of foundation pit engineering is ensured;

(2) the support system is also provided with lattice columns in the enclosure structure, and a plurality of steel purlins are arranged on the lattice columns along the height direction of the lattice columns, and the steel purlins are respectively connected with the assembled hollow steel pipe concrete supports between the corresponding crown beams or waist beams, so that the stability of the whole support system is further improved;

(3) the hollow steel pipe concrete support prefabricated part and the hollow steel pipe concrete support prefabricated part are connected through the bolt, so that the requirements of rigid connection and equal-strength connection of middle nodes 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 factory production and large-area popularization and application are convenient;

(4) according to the invention, multiple rows of long circular bolt holes are respectively arranged on the first U-shaped steel plate at the inner side of the crown beam or the waist beam and the second U-shaped steel plate at the end part of the assembled hollow steel pipe concrete support, and then the first U-shaped steel plate is connected with the second U-shaped steel plate 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;

(5) according to the invention, the jack is arranged between the first end steel plate at the inner side of the crown beam or the waist beam and the second end steel plate at the end part of the assembled hollow steel tube concrete support, so that stress compensation is carried out in time when the stress relaxation phenomenon occurs in the use process of the assembled hollow steel tube concrete support, early warning is carried out in time when the stress is overlarge, and the damage of the whole foundation pit caused by local instability of the 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 floor plan 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 hollow steel pipe concrete support preform provided in an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a hollow steel pipe concrete support preform joint provided by an embodiment of the present invention;

FIG. 5 is a longitudinal sectional view of a hollow steel pipe concrete support preform joint according to an embodiment of the present invention;

FIG. 6 is a top view of the junction of a fabricated hollow steel tube concrete support and a crown beam or wale provided by an embodiment of the present invention;

FIG. 7 is a cross-sectional view of the junction of a fabricated hollow steel tube concrete support and a crown beam or wale provided by 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 view of a connection between 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 temporary support according to an embodiment of the present invention;

in the figure: 1. the hollow steel tube concrete supports the prefab; 2. a crown beam; 3. an enclosure structure; 4. a steel pipe; 5. a stud; 6. concrete; 7. longitudinal ribs; 8. a spiral stirrup; 9. a hollow part; 10. a joint steel plate; 11. a bolt; 12. a stiffening plate; 13. an outer joint liner tube; 14. a joint liner tube; 15. an inner wrapping pipe; 16. engaging teeth; 17. 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 steel bracket; 30. a base; 31. a steel leg support; 32. an anti-corrosion coating; 33. a second end steel plate; 34. a wale.

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. 1-2, the present embodiment provides a fabricated hollow concrete-filled steel tube support system, which includes a building envelope 3 and a fabricated hollow concrete-filled steel tube support; the top of the enclosure structure 3 is provided with a crown beam 2, the inner side of the enclosure structure 3 is provided with a wale 34, and the assembled hollow steel pipe concrete supports are supported between two opposite sides of the wale 34 and between two opposite sides of the crown beam 2; the assembled hollow steel pipe concrete support is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts 1, and hollow parts 9 of the hollow steel pipe concrete support prefabricated parts 1 are communicated; the building enclosure structure 3 is further internally provided with lattice columns 27 and steel purlins 28, the lattice columns 27 are provided with a plurality of steel purlins 28 along the height direction, and the steel purlins 28 are connected with the assembled hollow steel pipe concrete supports. The assembled hollow steel pipe concrete support adopted in the support system of the embodiment is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts 1, so that the construction is convenient, and the prefabricated parts can be recycled conveniently; the hollow parts of the hollow steel pipe concrete support prefabricated parts 1 are communicated, so that the assembled hollow steel pipe concrete support has higher bearing capacity and stronger deformation resistance, and the safety of foundation pit engineering is ensured; and simultaneously, the stability of the whole supporting system is improved through the lattice columns 27 and the steel purlins 28.

Further, as shown in fig. 1 and 2, in the present embodiment, a plurality of lattice columns 27 are vertically arranged in a middle area along a width direction in the envelope structure 3, and the positions of the plurality of lattice columns 27 corresponding to the crown beams 2 in a height direction are connected by a steel surrounding purlin 28 arranged along a length direction, and the positions of the plurality of lattice columns 27 corresponding to the waist beams 34 in the height direction are respectively connected by a steel surrounding purlin 28 arranged along a length direction, so that optimally, the steel surrounding purlin 28 is vertically arranged and connected with the assembled hollow steel tube concrete support, thereby preventing the middle part of the assembled hollow steel tube concrete support from being largely deformed, and further improving the stability of the whole support system. 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 hollow steel pipe concrete support prefab 1, guarantee braced system's firm.

Further, as shown in fig. 3 to 5, the hollow steel tube concrete support prefabricated member 1 comprises a steel tube 4 and a joint steel plate 10, wherein the steel tube 4 is filled with concrete 6, and a hollow part 9 penetrating through the concrete 6 along the axial direction is arranged in the concrete; two ends of the steel pipe 4 are welded with annular joint steel plates 10, the inner sides of the joint steel plates 10 are positioned in the steel pipe 4, and the outer sides of the joint steel plates 10 are positioned outside the steel pipe 4 and are provided with a plurality of bolt holes along the annular direction; and corresponding bolt holes on adjacent joint steel plates 10 of adjacent hollow concrete-filled steel tube support prefabricated parts 1 are respectively connected through bolts 11. The hollow steel pipe concrete support prefabricated part 1 of this embodiment is the hollow component of 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, has apparent economic benefits, compare in concrete size concrete support, rigidity is higher, and steel pipe 4 is the extexine 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 cuff 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, the hollow steel pipe concrete support prefab 1 of this embodiment is connected through bolt 11 between the hollow steel pipe concrete support prefab 1, not only can satisfy the rigid connection of middle part node, wait the needs of strong connection, guarantees the safety and stability of foundation ditch engineering, and convenient construction moreover, the installation is convenient with the dismantlement, the batch production preparation of being convenient for and the popularization and application of large tracts of land.

In the embodiment, the section of the steel pipe 4 can be circular, square, pentagonal, polygonal and the like, the thickness of the steel pipe 4 can be 8-20mm, the steel pipe 4 can be made of high-strength steel or alloy steel, the stress is met, and the steel pipe is easy to weld; the concrete 6 filled in the steel tube 4 can be ultra-high strength concrete, light high strength concrete, foam concrete and the like, but the strength requirement is required to be met, the weight is not too large, the thickness is small under the condition of meeting the supporting rigidity, and the self weight of the prefabricated part is reduced; the hollow part can be not provided with any inner wall, or can be in the form of the inner wall, the material of the inner wall can be steel pipes, PVC and the like, the section of the inner wall is not limited to be circular, and the inner wall can also be in various shapes such as square, polygon and the like; the joint steel plate 10 can be a circular or square flange, and the joint steel plate 10 and the steel pipe 4 can be prefabricated into a whole or can be welded into a whole after being prefabricated in a split mode.

The bolt 11 of the embodiment can be a high-strength bolt or a mechanical bolt, and the stress requirement can be met; as shown in fig. 4 and 5, in this embodiment, one row or multiple rows of bolt holes may be arranged on the joint steel plate 10 along the circumferential direction, each row of bolt holes is multiple, corresponding bolt holes on adjacent joint steel plates 10 are all connected rigidly through bolts 11, and stiffening plates 12 are welded between every two rows of bolts 11, so as to ensure the rigid connection of the intermediate node, achieve the equal-strength connection of the node and the member, ensure that the fabricated support has the strength and rigidity close to or even higher than those of cast-in-place concrete support, and ensure the safety and stability of the foundation pit engineering.

Furthermore, the inner side and the outer side of the two ends of the steel pipe 4 are respectively provided with a joint inner lining pipe 14 and a joint outer lining pipe 13, and both the joint inner lining pipe 14 and the joint outer lining pipe 13 are welded with the joint steel plate 10. As shown in fig. 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 to bite into the concrete 6, so that the integrity of the hollow steel pipe concrete support prefabricated part 1 is further improved. The wall thickness of the inner wrapping pipe 15 of the embodiment is preferably 8-15mm, the inward extending length is 0.3-0.5m, the material is steel or alloy material, but reliable welding with the joint steel plate 10 is required; 8-12 meshing teeth 16 are uniformly arranged along the circumferential direction, the meshing teeth 16 are square, the side length is 30-50mm, the thickness is the same as that of the inner packing tube 15, and the inner packing concrete 6 is recessed to realize the tight meshing of the meshing teeth and the inner packing concrete.

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 strength is high, the rigidity is high, the hollow steel pipe concrete support prefabricated part 1 is not easy to damage in the using process, and the hollow steel pipe concrete support prefabricated part 1 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 hollow 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 32 to prevent the surface of the hollow steel pipe concrete support preform 1 from being rusted and damaged or having a reduced strength.

The hollow steel pipe concrete support prefabricated part 1 in the embodiment can be provided with a plurality of fixed modulus sections with proper lengths according to needs, the hollow steel pipe concrete support prefabricated part is too long and not suitable for hoisting construction, and joints are too many and difficult to connect due to too short length; as an implementation mode, the middle-section prefabricated parts can be designed into standard modules with specifications of 4m, 5m, 6m and the like, the end-section prefabricated parts can be designed into standard modules with specifications of 2m, and hollow steel pipe concrete support prefabricated parts 1 with completely the same, incompletely the same or completely different length specifications are selected to be combined according to the actual foundation pit requirements, so that the requirements of foundation pit supports with different widths and lengths are met, and the universal applicability is realized.

Further, a first U-shaped steel plate 20 is fixed on the inner side of the crown beam 2 or the waist beam 34, and a plurality of rows of long round bolt holes 26 are formed in two side plates of the first U-shaped steel plate 20; a second U-shaped steel plate 21 is fixed at the end part of the assembled hollow steel tube concrete support, and a plurality of rows of long round bolt holes 26 are formed in two side plates of the second U-shaped steel plate 21; the oblong bolt holes 26 on the two side walls of the first U-shaped steel plate 20 are connected with the oblong bolt holes 26 on the two side walls of the second U-shaped steel plate 21 through bolts 11. As shown in fig. 6 to 10, in this embodiment, a plurality of rows of long circular bolt holes 26 with adjustable positions are respectively formed in the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and the long circular bolt holes 26 are all arranged along the supporting direction, the first U-shaped steel plate 20 and the second U-shaped steel plate 21 are connected by bolts 11 penetrating through the long circular bolt holes 26, and the end nodes of the assembled hollow steel pipe concrete supports and the crown beams 2 or the waist beams 34 adopt the variable-length circular hole steel box slot nodes, which can meet the requirements of rigid connection and equal-strength connection of the end nodes, ensure engineering safety and detachability of the end nodes, facilitate recycling of prefabricated components, and simultaneously adjust the relative positions of the long circular bolt holes 26 as required to change the length of joints, and adjust errors in construction.

Further, one end of 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 to the inner sidewall of the crown beam 2 or the wale 34; the second U-shaped steel plate 21 is welded on a second end steel plate 33, and the second end steel plate 33 is connected with the end part of the fabricated hollow steel tube concrete support; a jack 22 is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and the front end and the rear end of the jack 22 are respectively propped against the second end steel plate 33 and the first end steel plate 18; the jack 22 is electrically connected to a control system 24. As shown in fig. 6, in the present embodiment, the jack 22 is arranged between the first end steel plate 18 on the inner side of the crown beam 2 or the wale 34 and the second end steel plate 33 on the end of the fabricated hollow steel tube concrete support, and the jack 22 is connected with the control system 24 to form the intelligent stress compensation device, so that the prestress can be constructed as required, and the requirement of repeated loading required by prestress loss and support relaxation is met; in the use process of the assembled hollow steel pipe concrete support, stress compensation is timely carried out when the stress relaxation phenomenon occurs, early warning is timely carried out when the stress is too large, and the damage to the whole foundation pit caused by local instability of the foundation pit is prevented. 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.

The jack 22 of 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 a designed early warning value, an alarm is automatically given; the jack 22 should not be oversized to prevent later difficulty in threading the bolt 11 through the oblong bolt hole 26.

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, a plurality of anchor bolts 17 are embedded in the crown beam 2 and the wale 34, a plurality of anchor bolt holes are formed in the first end steel plate 18, and one ends of the anchor bolts 17 extend out of the crown beam 2 or the wale 34, penetrate through the corresponding anchor bolt holes and are fixed through nuts 19. As shown in fig. 6-8, in the embodiment, the anchor bolt 17 is in place when the crown beam 2 or the steel bars are bound and is reliably connected with the steel bars in the crown beam 2, and is poured into the concrete of the crown beam 2, and the anchor bolt 17 needs to have enough anchoring length in the crown beam 2; in the embodiment, the anchor bolt 17 is embedded in the wale 34 for a certain length when the wale 34 is constructed, and is reliably connected with the wale 34; when the first end steel plate 18 is installed, the anchor bolt 17 penetrates through the anchor bolt hole in the first end steel plate 18, and the nut 19 is screwed, so that the installation is simple and convenient, and the connection is reliable; the nut 19 is preferably provided with two backing plates below, so that failure damage or looseness of one is avoided.

In this embodiment, the connection node between the wale 34 and the assembled hollow steel tube concrete support is the same as the connection node between the crown beam 2 and the assembled hollow steel tube concrete support, fig. 6 to 8 are diagrams of the connection node between the crown beam 2 and the assembled hollow steel tube concrete support, and the diagram of the connection node between the wale 34 and the assembled hollow steel tube concrete support only needs to change the crown beam 2 to the wale 34 in fig. 6 to 8.

Example two

The embodiment provides a construction method of an assembly type hollow steel tube concrete supporting system, which comprises the following steps:

s1, manufacturing a hollow steel tube concrete support prefabricated part 1, and constructing a building envelope 3 and a lattice column 27 in a factory according to a design drawing;

s2, when the crown beam 2 and the wale 34 are constructed, embedding anchor bolts 17 on the crown beam 2 and the wale 34, and enabling one ends of the anchor bolts 17 to extend out of the inner sides of the crown beam 2 or the wale 34;

s3, transporting the hollow steel tube concrete support prefabricated part 1 to a construction site, and connecting and assembling the hollow steel tube concrete support prefabricated part with bolts 11 to form an assembled hollow steel tube concrete support with a hollow part 9 communicated;

s4, welding one end of the first U-shaped steel plate 20 with the first end steel plate 18, installing the first end steel plate 18 on the anchor bolt 17 pre-embedded on the crown beam 2 or the waist beam 34, and fixing the anchor bolt 17 through the nut 19;

s5, welding one end of the second U-shaped steel plate 21 with the second end head steel plate 33, and connecting the second end head steel plate 33 with the end part of the assembled hollow steel tube concrete support through the bolt 11;

s6, mounting steel purlins 28 on the lattice columns 27, and constructing temporary supports at two ends of the foundation pit;

s7, aligning the first U-shaped steel plate 20 with the second U-shaped steel plate 21, and placing the jack 22 in a U-shaped groove formed by the first U-shaped steel plate 20 and the second U-shaped steel plate 21; respectively supporting two ends of the assembled hollow steel pipe concrete support on temporary supports at two ends, and controlling the jack 22 to pressurize through the control system 24 to enable the pressure of the jack 22 to reach a design value;

and S8, inserting and screwing bolts 11 into the oblong bolt holes 26 corresponding to the first U-shaped steel plate 20 and the second U-shaped steel plate 21, and connecting the assembled hollow steel tube concrete support with the steel purlin 28.

All adopt bolted connection between hollow steel pipe concrete support prefab 1 and crown beam 2 or girt 34 in this embodiment, realize the installation easily and dismantle, consequently, after the foundation ditch engineering construction finishes, can demolish bolt 11 of connecting hollow steel pipe concrete support prefab 1 and crown beam 2 or girt 34 and bolt 11 of connecting hollow steel pipe concrete support prefab 1 and hollow steel pipe concrete support prefab 1, realize the recovery of hollow steel pipe concrete support prefab 1, but cyclic utilization many times simultaneously, and the cost is reduced.

Further, the construction method of the temporary support in step S6 is: the method comprises the steps of firstly constructing a base 30, burying a steel leg support 31 on the base 30, then fixing a steel bracket 29 with a groove on the upper surface on the steel leg support 31, and enabling the bottom elevation of the groove on the upper surface of the steel bracket 29 to be the same as the top elevation of the steel purlin 28. As shown in fig. 11, the upper surface of the steel bracket 29 has a concave groove, and the concave groove matches with the shape of the steel tube 4 of the hollow steel tube concrete support prefabricated member 1, so as to facilitate the placement of the hollow steel tube concrete support prefabricated member 1, and when the fabricated hollow steel tube concrete support is spliced with the end node of the crown beam 2 or the wale 34, the prefabricated hollow steel tube concrete support plays a role of temporary support; wherein the base 30 is a reinforced concrete structure. The temporary support of this embodiment also can adopt other structural style, can to hollow steel pipe concrete support prefab 1 play the temporary support effect can, the construction of bolted connection of being convenient for.

The concrete method for manufacturing the hollow steel tube concrete support prefabricated member 1 in the factory in the step S1 comprises the following steps:

s11, preparing a steel pipe 4, a joint steel plate 10, a spiral stirrup 8, a longitudinal bar 7, a stiffening plate, a joint inner lining pipe 14, a joint outer lining pipe 13 and an inner cladding pipe 15 according to a design drawing;

s12, reserving a stud 5 on the inner wall of the steel pipe 4 during manufacturing, and arranging a spiral stirrup 8 and a longitudinal rib 7 in the steel pipe 4;

s13, welding joint steel plates 10 at two ends of the steel pipe 4 respectively;

s14, welding a joint inner lining pipe 14 and a joint outer lining pipe 13 on the inner side and the outer side of each end of the steel pipe 4 respectively, and enabling the joint inner lining pipe 14 and the joint outer lining pipe 13 to be connected with the steel pipe 4 and the joint steel plate 10;

s15, connecting the joint steel plate 10 with the longitudinal ribs 7 through the perforation plug welding 23;

s16, placing the inner tube 15 with the outer wall provided with the meshing teeth 16 in the spiral stirrup 8 and welding the inner tube with the joint steel plate 10; welding a stiffening plate 12, so that one end of the stiffening plate is welded on the joint outer liner pipe 13, and the other end of the stiffening plate is welded on the joint steel plate 10;

and S17, filling concrete 6 in the steel pipe 4 and reserving the hollow part 9 to finish the manufacture of the hollow steel pipe concrete support prefabricated member 1.

In the method for manufacturing the hollow steel pipe concrete support prefabricated part 1, the joint steel plate 10 and the steel pipe 4 are directly prefabricated into a whole, as another embodiment, the joint steel plate 10 and the steel pipe 4 can be prefabricated separately and then connected into a whole, specifically, after the steel pipe 4 is manufactured, the spiral stirrup 8 and the longitudinal rib 7 are firstly configured in the steel pipe 4, then the joint inner lining pipe 14 and the joint outer lining pipe 13 are respectively welded on the inner side and the outer side of the two ends of the steel pipe 4, then the inner side of the end part of the joint inner lining pipe 14 is welded with the outer side of an annular steel plate, the annular steel plate is connected with the longitudinal rib 7 through the perforation plug welding 23, then the inner wrapping pipe 15 is welded on the inner side of the annular steel plate, then the steel pipe 4 is filled with concrete 6, and the hollow part 9 is reserved, and the prefabrication of; and finally, welding the joint inner lining pipe 14, the joint outer lining pipe 13, the steel pipe 4, the annular steel plate and the inner clad pipe 15 with the joint steel plate 10, welding the stiffening plate 12 to enable one end of the stiffening plate to be welded on the joint outer lining pipe 13 and the other end of the stiffening plate to be welded on the joint steel plate 10, and connecting the prefabricated steel pipe concrete part and the joint steel plate 10 into a whole to finish the manufacture of the hollow steel pipe concrete support prefabricated member 1.

Since the concrete 6 in the centre of the steel duct 4 contributes to the load-bearing capacity, integrity and stiffness of the element only to a limited extent, the removal does not significantly reduce the load-bearing capacity of the element, but the weight of the element can be significantly reduced, thereby facilitating installation, transport and dismantling. In the embodiment, concrete 6 can be filled in the steel tube 4 by adopting a centrifugal process, so that an internal hollow can be automatically formed, the steel tube 4 can be used as an external template of the centrifugal process without being detached, and meanwhile, compared with the conventional cast-in-place vibration process, the centrifugal process is convenient for realizing high-strength concrete, and the hollow steel tube concrete has higher bearing capacity and deformation resistance and better durability; other processes may also be used to accomplish this.

Specifically, in step S3, the concrete-filled hollow steel tube support prefabricated member 1 is assembled into the fabricated concrete-filled hollow steel tube support by the following specific method: the two hollow concrete-filled steel tube supporting prefabricated parts 1 are centered, so that the joint steel plates 10 adjacent to the two hollow 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, the hollow concrete-filled steel tube supporting prefabricated parts 1 are connected in sequence, and the assembly type hollow concrete-filled steel tube supporting splicing is completed.

The hollow steel pipe concrete support prefabricated member 1 of the embodiment is connected through a plurality of high-strength bolts on the joint steel plate 10, the joint steel plate 10 and the steel pipe 4 can be integrally manufactured or welded, the joint steel plate is increased and stabilized through the stiffening plate 12, the force transmission is increased by adopting the joint inner lining pipe 14 and the joint outer lining pipe 13, the longitudinal ribs 7 are connected with the joint steel plate 10 through the perforated plug welding 23, and the rigidity of the middle node structure can be completely ensured.

The steel pipe 4, the joint steel plate 10, the first end steel plate 18, the second end steel plate 33, the first U-shaped steel plate 20, the second U-shaped steel plate 21, the stiffening plate 12 and other steel structures in the support system of the embodiment all have anticorrosion coatings coated on the outer sides in advance, so that the steel structures are prevented from rusting and damaging, and the strength is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The utility model provides a hollow steel pipe concrete braced system of assembled which characterized in that: the concrete-filled hollow steel tube support comprises a building envelope and an assembled hollow steel tube concrete support; the top of the enclosure structure is provided with a crown beam, the inner side of the enclosure structure is provided with a waist beam, and the assembled hollow steel pipe concrete supports are supported between two opposite sides of the waist beam and between two opposite sides of the crown beam; the assembled hollow steel pipe concrete support is formed by splicing a plurality of hollow steel pipe concrete support prefabricated parts, and hollow parts of the hollow steel pipe concrete support prefabricated parts are communicated; the enclosure structure is characterized in that lattice columns and steel enclosing purlins are further arranged in the enclosure structure, a plurality of steel enclosing purlins are arranged on the lattice columns along the height direction of the lattice columns, and the steel enclosing purlins are connected with the assembled hollow steel pipe concrete supports.

2. The fabricated hollow concrete filled steel tube support system of claim 1, wherein: the hollow steel tube concrete support prefabricated part comprises a steel tube and a joint steel plate, wherein concrete is filled in the steel tube, and a hollow part which penetrates through the concrete along the axial direction is formed in the concrete; annular joint steel plates are welded at two ends of the steel pipe, the inner sides of the joint steel plates are positioned in the steel pipe, and the outer sides of the joint steel plates are positioned outside the steel pipe and are provided with a plurality of bolt holes along the annular direction; and corresponding bolt holes on adjacent joint steel plates of the adjacent hollow concrete-filled steel tube support prefabricated parts are respectively connected through bolts.

3. The fabricated hollow concrete filled steel tube support system of claim 2, wherein: and the inner side and the outer side of the two ends of the steel pipe are respectively provided with a joint inner lining pipe and a joint outer lining pipe, and the joint inner lining pipe and the joint outer lining pipe are welded with the joint steel plate.

4. The fabricated hollow concrete filled steel tube support system of claim 2, wherein: inner wrapping pipes are arranged on the inner sides of the two ends of the concrete and are welded with the joint steel plates; and a circle of meshing teeth are arranged on the inner wrapping pipe and embedded into the concrete.

5. The fabricated hollow concrete filled steel tube support system of claim 2, wherein: and a plurality of studs are welded on the inner wall of the steel pipe and embedded into the concrete.

6. The fabricated hollow concrete filled steel tube support system of claim 1, wherein: a first U-shaped steel plate is fixed on the inner side of the crown beam or the waist beam, and a plurality of rows of long round bolt holes are formed in the two side plates of the first U-shaped steel plate; a second U-shaped steel plate is fixed at the end part of the assembled hollow steel pipe concrete support, and a plurality of rows of long round bolt holes are formed in the two side plates of the second U-shaped steel plate; and the long round bolt holes in the two side walls of the first U-shaped steel plate are connected with the long round bolt holes in the two side walls of the second U-shaped steel plate through bolts.

7. The fabricated hollow concrete filled steel tube support system of claim 6, wherein: one end of the first U-shaped steel plate is welded on a first end steel plate, and the first end steel plate is fixed on the inner side wall of the crown beam or the waist beam; the second U-shaped steel plate is welded on a second end steel plate, and the second end steel plate is connected with the end part of the assembled hollow steel tube concrete support; a jack is arranged in a U-shaped groove formed by connecting the first U-shaped steel plate and the second U-shaped steel plate, and the front end and the rear end of the jack are respectively abutted against the second end steel plate and the first end steel plate; the jack is electrically connected with the control system.

8. The fabricated hollow concrete filled steel tube support system of claim 7, wherein: crown beam with all pre-buried a plurality of crab-bolts in the waist rail, be equipped with a plurality of anchor bolt holes on the first end steel sheet, the one end of crab-bolt stretches out crown beam or pass behind the waist rail and correspond the anchor bolt hole to it is fixed through the nut.

9. The construction method of the assembled hollow steel tube concrete support system is characterized by comprising the following steps:

s1, manufacturing a hollow steel tube concrete support prefabricated part in a factory according to a design drawing, and constructing a building envelope and a lattice column;

s2, when constructing the crown beam and the wale, embedding anchor bolts on the crown beam and the wale, and enabling one ends of the anchor bolts to extend out of the inner sides of the crown beam or the wale;

s3, transporting the hollow steel tube concrete support prefabricated member to a construction site, and assembling the hollow steel tube concrete support prefabricated member into an assembly type hollow steel tube concrete support with a communicated hollow part through bolt connection;

s4, welding the first U-shaped steel plate and the first end steel plate, installing the first end steel plate on an anchor bolt pre-embedded on the crown beam or the waist beam, and fixing the first end steel plate through a nut;

s5, welding the second U-shaped steel plate and the second end steel plate, and connecting the second end steel plate and the end part of the fabricated hollow steel tube concrete support through a bolt;

s6, mounting steel purlins on the lattice columns, and constructing temporary supports at two ends of the foundation pit;

s7, aligning the first U-shaped steel plate and the second U-shaped steel plate, and placing a jack in a U-shaped groove formed by the first U-shaped steel plate and the second U-shaped steel plate; respectively supporting two ends of the assembled hollow steel pipe concrete support on temporary supports at two ends, and controlling the jack to pressurize through a control system to enable the jack pressure to reach a design value;

and S8, inserting bolts into the long round bolt holes corresponding to the first U-shaped steel plate and the second U-shaped steel plate, screwing the bolts, and connecting the assembled hollow steel tube concrete support with the steel purlin.

10. The construction method of an assembled hollow steel pipe concrete supporting system according to claim 9, wherein the construction method of the temporary support in the step S6 is: the base is constructed firstly, the steel leg support is embedded in the base, then the steel bracket with the groove in the upper surface is fixed on the steel leg support, and the bottom elevation of the groove in the upper surface of the steel bracket is the same as the top elevation of the steel purlin.

Images