CN112538931B - A large-span trapezoidal space steel tube truss concrete floor structure - Google Patents
A large-span trapezoidal space steel tube truss concrete floor structure Download PDFInfo
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- CN112538931B CN112538931B CN202011588048.0A CN202011588048A CN112538931B CN 112538931 B CN112538931 B CN 112538931B CN 202011588048 A CN202011588048 A CN 202011588048A CN 112538931 B CN112538931 B CN 112538931B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000003466 welding Methods 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
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- 238000012937 correction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
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- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
一种大跨度梯形空间钢管桁架混凝土楼盖结构，包括混凝土楼板以及大跨度梯形空间钢管桁架，且直接承受楼面荷载的混凝土楼板布设在大跨度梯形空间钢管桁架三管上弦杆的T形支托之上；大跨度梯形空间钢管桁架的基本单元为一个节间，每个节间由三管上弦杆、两管下弦杆、四角锥斜腹杆、上弦水平杆以及下弦水平杆构成，基本单元的截面形状为三角形排列的倒梯形；所述大跨度梯形空间钢管桁架采用钢管直接焊接节点的相贯连接；所述混凝土楼板采用装配式预制板或钢‑混组合楼板。本发明结构合理、构造简单、传力明确、安装方便，不设置楼板次梁和空间桁架的平面外次桁架，用钢量小、刚度大、承载力高，跨越能力强、舒适度好、力学性能优越。
A large-span trapezoidal space steel tube truss concrete floor structure includes a concrete floor and a large-span trapezoidal space steel tube truss, and the concrete floor directly bearing the floor load is arranged on the T-shaped support of the three-tube upper chord of the large-span trapezoidal space steel tube truss; the basic unit of the large-span trapezoidal space steel tube truss is a bay, each bay is composed of a three-tube upper chord, a two-tube lower chord, a four-cornered pyramid diagonal web, an upper chord horizontal bar and a lower chord horizontal bar, and the cross-sectional shape of the basic unit is an inverted trapezoid arranged in a triangular shape; the large-span trapezoidal space steel tube truss adopts the intersecting connection of the steel tube direct welding node; the concrete floor adopts an assembled prefabricated plate or a steel-concrete composite floor. The present invention has a reasonable structure, simple construction, clear force transmission, and convenient installation. The floor secondary beam and the out-of-plane secondary truss of the space truss are not set, the steel consumption is small, the rigidity is large, the bearing capacity is high, the spanning capacity is strong, the comfort is good, and the mechanical properties are excellent.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a large-span trapezoidal space steel pipe truss concrete floor structure.
Background
In recent years, public buildings with large-span roofs, such as stadiums, convention centers, theaters, industrial plants, and the like, are becoming more and more widespread. The roof structure of the building has various forms, including arch, plane truss, stereo truss, net rack, net shell, string beam, string branch dome, etc. the building has light metal roof or film material and is considered as no-load roof. However, for the upstairs and the roofs, the light roofs cannot guarantee the bearing capacity and rigidity requirements due to the large live load, so that the concrete floor is needed to replace the upstairs and the roofs. Meanwhile, the remarkable increase of the constant load and the live load of the concrete floor slab can lead to the structural form being difficult to meet the mechanical property and poor in economical efficiency.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-span trapezoidal space steel pipe truss concrete floor structure, which has the advantages of rich building state, light and handy shape, convenience in pipeline crossing, reasonable structure, simple structure, definite force transmission, convenience in installation, no arrangement of a floor secondary beam and an out-of-plane secondary truss of a space truss, small steel consumption of the whole structure, high rigidity, high bearing capacity, strong crossing capacity, good comfort level and superior mechanical property.
The concrete floor structure of the large-span trapezoidal space steel pipe truss comprises a large-span trapezoidal space steel pipe truss and concrete floors, wherein the concrete floors directly bearing floor loads are arranged on T-shaped supports of three upper chords of the trapezoidal space steel pipe truss, basic units of the large-span trapezoidal space steel pipe truss are internodes, each internode is composed of three upper chords, two lower chords, four-angle-cone diagonal web members, upper chord horizontal rods and lower chord horizontal rods, the cross section of each basic unit is an inverted trapezoid arranged in a triangular mode, the large spans are formed by splicing a plurality of basic units of the trapezoidal space steel pipe truss, the three upper chords and the two lower chords of the large-span trapezoidal space steel pipe truss are main pipes, the four-angle-cone diagonal web members, the upper chord horizontal rods and the lower chord horizontal rods are branch pipes, the large-span trapezoidal space steel pipe truss is connected through direct welding nodes, the concrete floors are assembled precast slabs or steel-concrete floor plates in a steel-concrete mixed mode, and the large-span trapezoidal space steel pipe truss is fixedly connected with the T-shaped supports through the T-shaped supports.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the large-span trapezoidal space steel pipe truss is in the form of a parallel chord truss, a trapezoidal truss, a variable-height curved truss or an arched truss.
As the preferable scheme of the concrete floor structure of the large-span trapezoidal space steel pipe truss, the rod pieces of the basic units are round steel pipes, the type of the steel pipes is rolled or welded, and the ratio of the outer diameter to the wall thickness of the pressed rod pieces of the large-span trapezoidal space steel pipe truss is not more thanEpsilon k is the steel grade correction coefficient.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, node center distances S j0,j0 =1 and 2 with the lengths of 0.9 times are calculated in the plane of the three-pipe upper chord member and the two-pipe lower chord member and out of the plane, stability of the three-pipe upper chord member and the two-pipe lower chord member is checked by a lattice type compression bar according to 0.9S j0, and node center distances S j1,j1 =3, 4 and 5 with the lengths of 0.8 times are calculated in the plane of the quadrangular pyramid diagonal web member, the upper chord horizontal member and the lower chord horizontal member and out of the plane.
The concrete floor structure of the large-span trapezoidal space steel pipe truss has the advantages that the outer dimension of the main pipe is not smaller than the outer dimension of the branch pipe, the wall thickness of the main pipe is not smaller than the wall thickness of the branch pipe, the branch pipe cannot be inserted into the main pipe at the joint of the branch pipe and the main pipe, the included angle between the main pipe and the branch pipe or the axis of the branch pipe is not smaller than 30 degrees, the end part of the branch pipe of the large-span trapezoidal space steel pipe truss is cut by adopting an automatic pipe cutting machine, and a groove is not cut when the wall thickness of the branch pipe is smaller than 6 mm.
As the preferable scheme of the concrete floor structure of the large-span trapezoidal space steel pipe truss, the eccentricity of the joint of the branch pipe and the main pipe of the large-span trapezoidal space steel pipe truss is not more than-0.55-0.25, the influence of eccentric bending moment is considered for the pressed main pipe, the tension main pipe and the joint are negligible, the eccentric bending moment M=delta N-e, e is the eccentricity, D is the outer diameter (mm) of the main pipe of the circular pipe, and delta N is the difference of the pipe axial forces of the main pipes at two sides.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the branch pipes of the large-span trapezoidal space steel pipe truss adopt a K-shaped node with gaps and a K-shaped node which are overlapped, the gaps of adjacent branch pipes welded on the surface of a main pipe are not smaller than 2 times of the wall thickness of the two branch pipes, and the peripheral welding seams of the overlapped branch pipes are 2 times of the wall thickness of the branch pipes.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the connecting welding seams of the branch pipes and the main pipe are continuously welded along the whole circumference and smoothly transited, the welding seam forms are fillet welds along the whole circumference or are butt welds or are fillet welds, the butt welds or the fillet welds with grooves are adopted for the area with the included angle of more than or equal to 120 DEG between the pipe walls of the branch pipes and the pipe walls of the main pipe, the welding foot size of the fillet welds is not more than 2 times of the wall thickness of the branch pipes, the welding seam of the periphery of the lap joint branch pipe is 2 times of the wall thickness of the branch pipe, the large-span trapezoidal space steel pipe truss of the direct welding node and the planar K-shaped node of the lap joint of the branch pipes meet the lap joint rate of 25 percent to be less than or equal to ov percent, and the continuous welding seams among the lap joint branch pipes can reliably transmit internal force.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, when the outer sizes of the mutually overlapped branch pipes are different, the branch pipe with smaller outer size is overlapped on the branch pipe with larger outer size, when the wall thickness of the branch pipe is different, the branch pipe with smaller wall thickness is overlapped on the branch pipe with larger wall thickness, and the branch pipe bearing the axle center pressure is arranged below.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, when the node can not meet the requirement of bearing capacity, a transverse stiffening plate is arranged in a main pipe or the main pipe is reinforced by adopting a method of pasting the stiffening plate on the surface of the main pipe.
As the preferable scheme of the concrete floor structure of the large-span trapezoidal space steel pipe truss, the T-shaped support is welded on the three upper chords of the large-span trapezoidal space steel pipe truss, and the supporting surface of the T-shaped support is parallel to the bottom of the concrete slab.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the shear keys of the pegs are vertically arranged with the supporting surfaces of the T-shaped lugs, the diameters of the shear keys of the pegs are not smaller than 16mm, and the lengths and the intervals are not smaller than 4 times of the diameters.
The concrete floor slab is arranged on the T-shaped support of the upper chord member of the large-span trapezoidal space steel pipe truss, the supporting length of the assembled precast slab on the T-shaped support is not less than 100mm, the assembled precast slab and the T-shaped support are connected by fillet weld girth welding, the joint width of the assembled precast slab and the T-shaped support is not less than 20mm, the supporting length of the steel-concrete composite floor slab on the T-shaped support is not less than 100mm, and the building supporting slab of the steel-concrete composite floor slab and the T-shaped support are welded in a penetrating manner by adopting a stud shear key.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the span of the prefabricated plates is S1, S3 or S6, and the span of the steel-concrete composite floor slab is S3 and S6.
The large-span trapezoid space steel pipe truss has the span of L, the column spacing of B, the truss height of H, the space between three upper chords of S1, the space between two lower chords of S2, the space between the upper chords of S3, the space between the lower chords of S4, the space between quadrangular pyramid diagonal web members of S5, and the space between the upper chords of the outer sides of the trapezoid space steel pipe trusses adjacent to the i+1th truss of S6.
As the preferable scheme of the large-span trapezoidal space steel pipe truss concrete floor structure, the concrete floor is not provided with secondary beams, and secondary trusses are not arranged outside the planes of the i < th > truss and the i+1 < th > truss adjacent trapezoidal space steel pipe trusses.
Compared with the prior art, the invention has the beneficial effects that the concrete floor slab directly bearing the floor load is arranged on the T-shaped support of the three-pipe upper chord of the large-span trapezoidal space steel pipe truss, the basic unit of the large-span trapezoidal space steel pipe truss consists of the three-pipe upper chord, the two-pipe lower chord, the quadrangular pyramid diagonal web member, the upper chord horizontal rod and the lower chord horizontal rod, the section form is an inverted trapezoid with triangular arrangement, and the space truss steel pipes are directly connected by welding nodes, so that the 1-building-state is rich, the modeling is light and handy, and the pipeline crossing is convenient. 2. Reasonable structure, simple structure, definite force transmission and convenient installation. 3. The floor span is smaller, does not set up the secondary beam. 4. The large-span trapezoidal space truss has good overall stability outside the plane, and no secondary truss is arranged. 5. The steel used for the structure is small in amount, high in rigidity, high in bearing capacity, strong in spanning capacity and good in comfort level. 6. The mechanical property of the whole structure is excellent.
Drawings
FIG. 1 is a schematic diagram of a large-span trapezoidal space steel pipe truss concrete floor structure of the invention;
In the drawing, the floor slab comprises a 1-basic unit, a 2-three-pipe upper chord member, a 3-two-pipe lower chord member, a 4-quadrangular pyramid inclined web member, a 5-upper chord horizontal member, a 6-lower chord horizontal member, a 7-T-shaped support, an 8-stud shear key, a 9-assembled precast slab and a 10-steel-concrete composite floor slab.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the concrete floor slab comprises a large-span trapezoidal space steel pipe truss and concrete floor slabs, wherein the concrete floor slabs directly bear floor loads and are arranged above T-shaped supports of three upper chords 2 of the large-span trapezoidal space steel pipe truss, a basic unit 1 of the large-span trapezoidal space steel pipe truss is an internode, each internode is composed of three upper chords 2, two lower chords 3, a quadrangular pyramid diagonal web member 4, an upper chord horizontal member 5 and a lower chord horizontal member 6, the cross section of each basic unit is in an inverted trapezoid in triangular arrangement, the large span is formed by splicing a plurality of basic units of the trapezoidal space steel pipe truss, the three upper chords 2 and the two lower chords 3 of the large-span trapezoidal space steel pipe truss are main pipes, the quadrangular pyramid diagonal web member 4, the upper chord horizontal member 5 and the lower chord horizontal member 6 are branch pipes, the large-span trapezoidal space steel pipe truss is directly connected through welded joints, the concrete floor slabs are assembled precast slabs 9 or steel-concrete floor slabs 10, and the large-span trapezoidal space steel pipe truss is fixedly connected with the large-span steel pipe truss through T-shaped supports 7 and shear keys 8.
In this embodiment, the rods of the basic unit 1 are all round steel pipes, and the type of the steel pipes can be rolled or welded.
In the embodiment, the large-span trapezoid space steel pipe truss of the direct welding node is not smaller than the outer dimension of the branch pipe, the wall thickness of the main pipe is not smaller than the wall thickness of the branch pipe, the branch pipe cannot be inserted into the main pipe at the joint of the branch pipe and the main pipe, the included angle between the main pipe and the branch pipe or the axis of the branch pipe is not smaller than 30 degrees, the end part of the branch pipe of the large-span trapezoid space steel pipe truss is cut by adopting an automatic pipe cutting machine, and a groove is not cut when the wall thickness of the branch pipe is smaller than 6 mm.
In this embodiment, the large-span trapezoidal space steel pipe truss of the direct welding node, the branch pipe adopts the K-shaped node with a gap and the K-shaped node with overlap joint, and the gap between the adjacent branch pipes welded on the surface of the main pipe is not less than 2 times of the wall thickness of the two branch pipes, and the peripheral welding seam of the overlap joint branch pipe is 2 times of the wall thickness of the branch pipe.
In the embodiment, the large-span trapezoid space steel pipe truss of the direct welding node is characterized in that the connecting welding seam of the branch pipe and the main pipe is continuously welded along the whole circumference and is in smooth transition, the welding seam forms are fillet welds along the whole circumference or are partially butt welds, the fillet welds are partially adopted, the butt welds or the fillet welds with grooves are adopted for the area with the included angle of more than or equal to 120 DEG between the pipe wall of the branch pipe and the pipe wall of the main pipe, the welding leg size of the fillet welds is not more than 2 times of the wall thickness of the branch pipe, the welding seam on the periphery of the lap joint is 2 times of the wall thickness of the branch pipe, the large-span trapezoid space steel pipe truss of the direct welding node and the lap joint of the branch pipe meet the requirement on the lap joint rate, and the continuous welding seam between the lap joint branch pipes can reliably transmit internal force.
In this embodiment, the large-span trapezoidal space steel pipe truss of direct welded joint, when the outside dimensions of the branch pipes that overlap each other are different, the outside dimensions are smaller and overlap on the bigger one, when the wall thickness of the branch pipe is different, the smaller one overlaps on the bigger one, and the branch pipe that bears the axle center pressure is below.
In this embodiment, the T-shaped support 7 is welded on the three-tube upper chord member 2 of the large-span trapezoidal space steel tube truss, and the supporting surface of the T-shaped support 7 is parallel to the concrete slab bottom.
In the embodiment, the peg shear key 8 is arranged perpendicular to the supporting surface of the T-shaped support 7, the diameter of the peg shear key 8 is not smaller than 16mm, and the length and the distance are not smaller than 4 times of the diameter.
In the embodiment, the concrete floor slab 9 or 10 is arranged on the T-shaped support 7 of the three-pipe upper chord member 2 of the large-span trapezoidal space steel pipe truss, the supporting length of the assembled precast slab 9 on the T-shaped support 7 is not less than 100mm, the assembled precast slab and the T-shaped support 7 are connected by adopting fillet weld girth welding, the joint width between the assembled precast slabs 9 is not less than 20mm, the supporting length of the steel-concrete composite floor slab 10 on the T-shaped support 7 is not less than 100mm, and the building supporting plate of the steel-concrete composite floor slab 10 and the T-shaped support 7 are penetratingly welded by adopting the stud shear key 8.
In the actual processing and splicing process, an upper chord plane rod piece, a lower chord plane rod piece and a quadrangular pyramid support jig are respectively manufactured according to the form of a large-span trapezoidal space steel pipe truss, then three upper chord rods 2, upper chord horizontal rods 5 and T-shaped lugs 7 are arranged on the upper chord plane rod piece support jig, two lower chord rods 3 and lower chord horizontal rods 6 are arranged on the lower chord plane rod piece support jig, all the upper chord plane rod piece and the lower chord plane rod piece are connected through intersecting welds, splicing of the upper chord plane rod piece and the lower chord plane rod piece is completed, the lower chord plane rod piece is used as a support, the quadrangular pyramid support jig is moved to an installation position, intersecting welding of the quadrangular pyramid diagonal web rods 4 is carried out, so that a space support platform is formed, and therefore the upper chord plane rod piece and the intersecting welding are further erected, and finally the integral splicing of the trapezoidal space steel pipe truss is completed, and storage, transportation and field installation can be carried out. In actual construction, hoisting equipment is used for hoisting a large-span trapezoidal space steel pipe truss onto a support frame, after the steel pipe truss is hoisted in place and fixed with a support, concrete floor installation is carried out according to design selection, if an assembled precast slab 9 is selected, the bottom of a precast slab rib is supported on the top surface of a T-shaped support 7 and is connected by fillet weld girth welding, if a steel-concrete combined floor 10 is selected, a floor support plate is paved firstly, stud shear keys 8 and the floor support plate are penetrated and welded onto the T-shaped support 7 according to arrangement intervals, distributed steel bars are paved, concrete is poured, and the design index is reached after curing for a certain time, so that the steel-concrete combined floor 10 is formed. And finally, manufacturing the whole large-span trapezoidal space steel pipe truss concrete floor structure.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.
Claims (8)
1. A concrete floor structure of a large-span trapezoidal space steel pipe truss is characterized by comprising a concrete floor slab and a plurality of large-span trapezoidal space steel pipe trusses which are arranged according to column spacing, wherein the concrete floor slab which directly bears floor load is arranged on T-shaped lugs (7) of three upper chords (2) of the large-span trapezoidal space steel pipe truss; the large-span trapezoidal space steel pipe truss comprises a basic unit (1) which is an internode, each internode consists of three-pipe upper chords (2), two-pipe lower chords (3), four-angle-cone inclined web members (4), upper chord horizontal rods (5) and lower chord horizontal rods (6), the cross section of the basic unit (1) is in a triangle-shaped inverted trapezoid, the large-span trapezoidal space steel pipe truss is formed by splicing a plurality of basic units, the three-pipe upper chords (2) and the two-pipe lower chords (3) of the large-span trapezoidal space steel pipe truss are main pipes, the four-angle-cone inclined web members (4), the upper chord horizontal rods (5) and the lower chord horizontal rods (6) are branch pipes, the large-span trapezoidal space steel pipe truss is connected by adopting steel pipe direct welded joints, the concrete floor is fixed by adopting an assembled precast slab (9) or a steel-concrete composite floor slab (10), and the connection of the concrete floor slab and the large-span trapezoidal space truss is fixed by T-shaped support brackets (7) and stud keys (8);
The rod members of the basic unit (1) are round steel pipes, the type of the steel pipes is rolled or welded, and the ratio of the outer diameter to the wall thickness of the pressed rod members of the large-span trapezoid space steel pipe truss is not more than Epsilon k is a steel grade correction coefficient, node center distances S j0,j0 =1 and 2 with the lengths of 0.9 times are calculated on the inner surfaces and the outer surfaces of the planes of the three-pipe upper chord member (2) and the two-pipe lower chord member (3), stability of the three-pipe upper chord member is checked by a lattice type compression bar according to 0.9S j0, and node center distances S j1,j1 =3, 4 and 5 with the lengths of 0.8 times are calculated on the inner surfaces and the outer surfaces of the four-angle cone diagonal web member (4), the upper chord horizontal member (5) and the lower chord horizontal member (6).
2. The concrete floor structure of the large-span trapezoidal space steel pipe truss of claim 1, wherein the large-span trapezoidal space steel pipe truss is in the form of a parallel chord truss, a trapezoidal truss, a variable-height curved truss or an arched truss.
3. The concrete floor structure of the large-span trapezoidal space steel pipe truss, which is disclosed by claim 1, is characterized in that the outer dimension of a main pipe is not smaller than the outer dimension of a branch pipe, the wall thickness of the main pipe is not smaller than the wall thickness of the branch pipe, the branch pipe is not inserted into the main pipe at the joint of the branch pipe and the main pipe, the included angle between the main pipe and the axis of the branch pipe or the branch pipe is not smaller than 30 degrees, the end part of the branch pipe of the large-span trapezoidal space steel pipe truss is cut, and a groove is not cut when the wall thickness of the branch pipe is smaller than 6 mm.
4. The concrete floor structure of the large-span trapezoidal space steel pipe truss of claim 1, wherein the eccentricity of the joint of the branch pipe and the main pipe is not more than-0.55-e/D-0.25, and the influence of eccentric bending moment is considered for the pressed main pipe, and the eccentric bending moment M=delta N-e is ignored for the tension main pipe and the joint, wherein e is the eccentricity, D is the main pipe outer diameter, and delta N is the difference of pipe axial forces of the main pipes at two sides.
5. The concrete floor structure of the large-span trapezoidal space steel pipe truss of claim 1, wherein the branch pipes adopt K-shaped nodes with gaps and lap joint K-shaped nodes, the gaps of adjacent branch pipes welded on the surface of the main pipe are not less than 2 times of the wall thickness of the two branch pipes, and the peripheral welding seams of the lap joint branch pipes are 2 times of the wall thickness of the branch pipes.
6. The large-span trapezoidal space steel pipe truss concrete floor structure of claim 5, wherein the connecting weld joint of the branch pipe and the main pipe is welded continuously along the whole circumference and is transited smoothly, the weld joint is formed by adopting a fillet weld along the whole circumference or adopting a butt weld joint partially, the fillet weld joint is adopted for a region with an included angle of more than or equal to 120 DEG between the pipe wall of the branch pipe and the pipe wall of the main pipe, the size of a welding foot of the fillet weld joint is not more than 2 times of the wall thickness of the branch pipe, the welding joint at the periphery of the lap joint branch pipe is 2 times of the wall thickness of the branch pipe, the lap joint rate of the lap joint of the branch pipe is more than or equal to 25 percent and less than or equal to ov percent, the continuous weld joint between the lap joint branch pipes can reliably transmit internal force, when the external sizes of the mutually lap joint branch pipes are different, the external sizes of the branch pipes are overlapped on the larger-sized ones, the smaller-walled ones are overlapped on the larger-walled ones, and the branch pipes bearing axle center pressure are arranged below.
7. The large-span trapezoidal space steel pipe truss concrete floor structure according to claim 1 is characterized in that the T-shaped support (7) is welded on the three-pipe upper chord member (2), the supporting surface of the T-shaped support (7) is parallel to the bottom of a concrete floor slab, the peg shear keys (8) are vertically arranged with the supporting surface of the T-shaped support (7), and the diameter of each peg shear key (8) is not smaller than 16mm, and the length and the distance are not smaller than 4 times of the diameter.
8. The concrete floor structure of the large-span trapezoidal space steel pipe truss, as set forth in claim 1, characterized in that the concrete floor is arranged on T-shaped lugs (7) of three upper chords (2) of the large-span trapezoidal space steel pipe truss, when the assembled precast slab (9) is adopted, the supporting length of the assembled precast slab (9) on the T-shaped lugs (7) is not less than 100mm and is connected with the T-shaped lugs (7) by fillet girth welding, the joint width of the assembled precast slab (9) is not less than 20mm, when the steel-concrete composite floor (10) is adopted, the supporting length of the steel-concrete composite floor (10) on the T-shaped lugs (7) is not less than 100mm, and the floor supporting slab of the steel-concrete composite floor (10) and the T-shaped lugs (7) are penetratingly welded by stud shear keys (8).
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| CN202011588048.0A CN112538931B (en) | 2020-12-28 | 2020-12-28 | A large-span trapezoidal space steel tube truss concrete floor structure |
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| CN202011588048.0A CN112538931B (en) | 2020-12-28 | 2020-12-28 | A large-span trapezoidal space steel tube truss concrete floor structure |
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| CN112538931A CN112538931A (en) | 2021-03-23 |
| CN112538931B true CN112538931B (en) | 2025-02-14 |
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