CN114232804A - Large-span prefabricated assembly type structure - Google Patents
Large-span prefabricated assembly type structure Download PDFInfo
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- CN114232804A CN114232804A CN202111671292.8A CN202111671292A CN114232804A CN 114232804 A CN114232804 A CN 114232804A CN 202111671292 A CN202111671292 A CN 202111671292A CN 114232804 A CN114232804 A CN 114232804A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 494
- 239000010959 steel Substances 0.000 claims abstract description 494
- 239000004567 concrete Substances 0.000 claims abstract description 99
- 238000010276 construction Methods 0.000 claims abstract description 16
- 210000002435 tendon Anatomy 0.000 claims description 27
- 238000003466 welding Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 230000006870 function Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
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- 240000004282 Grewia occidentalis Species 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
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- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
Abstract
The invention discloses a large-span prefabricated assembled structure, which comprises a large-span prefabricated beam and a plurality of concrete-filled steel tubular columns, wherein the large-span prefabricated beam is provided with a plurality of prefabricated steel tubular columns; the large-span precast beam comprises a plurality of main beams and a plurality of secondary beams; the main beams can surround to form a large-span precast beam frame, the secondary beams are connected in the large-span precast beam frame in a cross mode, and the main beams and the secondary beams are all prestressed steel frame beam structures; and the plurality of steel pipe concrete columns are used for being in one-to-one corresponding assembly connection with the plurality of corners of the large-span precast beam frame. In this scheme, through the organic combination of large-span precast beam and a plurality of steel core concrete column to in providing a large-span frame construction, thereby help solving the limited and not high problem of building space service function flexibility of span that present building trade exists.
Description
Technical Field
The invention relates to the technical field of assembly of frame structures in the fields of civil engineering and construction, in particular to a large-span prefabricated assembly type structure.
Background
The development of the fabricated building is one of the key points of the reform of the building industry in recent years and is also one of the green buildings advocated vigorously by the nation. In the field of house construction and civil engineering at present, fabricated building structures are increasingly used.
However, the current fabricated building structure has the problems of limited span, low flexibility of using functions of building space, difficult routing of solid beams, and the like.
Disclosure of Invention
In view of the above, the invention provides a large-span prefabricated assembled structure, which is a large-span frame structure conveniently provided by organically combining a large-span precast beam and a plurality of steel pipe concrete columns, so that the problems of limited span and low flexibility of use function of building space in the current building industry are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a large-span prefabricated assembled structure comprises a large-span prefabricated beam and a plurality of concrete-filled steel tubular columns;
the large-span precast beam comprises a plurality of main beams and a plurality of secondary beams; the plurality of main beams can surround to form a large-span precast beam frame, the plurality of secondary beams are connected in the large-span precast beam frame in a cross mode, the plurality of steel tube concrete columns are used for being correspondingly assembled and connected with a plurality of corners of the large-span precast beam frame one by one, and the main beams and the secondary beams are all prestressed steel frame beam structures;
the girder includes: the steel pipes at the lower parts of the main beams, the steel pipes at the upper parts of the two main beams, the main beam connecting section steel, the main beam prestressed tendons and the main beam concrete;
the steel pipes at the upper parts of the two main beams are arranged in parallel; the steel pipes at the lower parts of the main beams are respectively parallel to the steel pipes at the upper parts of the two main beams and are positioned below the middle part of the steel pipes at the upper parts of the two main beams; the steel pipes at the lower part of the main beam and the steel pipes at the upper parts of the two main beams are connected with each other through the main beam connecting section steel; the main beam prestressed tendons are arranged in the steel pipe at the lower part of the main beam; and the main beam concrete is respectively poured in the steel pipes at the lower part of the main beam and the steel pipes at the upper parts of the two main beams.
Preferably, the secondary beam includes: the steel pipes at the lower parts of the secondary beams, the steel pipes at the upper parts of the two secondary beams, the secondary beam connecting section steel, the secondary beam prestressed tendons and the secondary beam concrete;
the steel pipes at the upper parts of the two secondary beams are arranged in parallel; the secondary beam lower steel pipes are respectively parallel to the two secondary beam upper steel pipes and are positioned below the middle of the two secondary beam upper steel pipes; the lower steel pipe of the secondary beam and the upper steel pipes of the two secondary beams are connected with each other through the secondary beam connecting section steel; the secondary beam prestressed tendons are arranged in the steel pipe at the lower part of the secondary beam; and the secondary beam concrete is respectively poured in the steel pipe at the lower part of the secondary beam and the steel pipes at the upper parts of the two secondary beams.
Preferably, the end parts of the steel pipes at the upper parts of the two secondary beams are connected with the pipe wall of the steel pipe at the upper part of the main beam close to the secondary beams;
the large-span precast beam also comprises angle steel;
the length of the steel pipe at the lower part of the secondary beam is greater than that of the steel pipe at the upper part of the secondary beam, and the end part of the steel pipe extends to the upper part of the steel pipe at the lower part of the main beam; the steel pipe at the lower part of the secondary beam is connected with the steel pipe at the lower part of the main beam through the angle steel;
the end parts of the two secondary beam upper steel pipes are connected with the pipe walls of the adjacent secondary beam upper steel pipes; and the end part of the steel pipe at the lower part of the secondary beam is connected with the pipe wall of the adjacent steel pipe at the lower part of the secondary beam.
Preferably, the number of the main beam connection section steel connected between the two main beam upper steel pipes, the number of the main beam connection section steel connected between one main beam upper steel pipe and one main beam lower steel pipe, and the number of the main beam connection section steel connected between the other main beam upper steel pipe and the other main beam lower steel pipe are multiple, and are all arranged in an end-to-end N shape;
the secondary beam connecting section steel is connected between the two secondary beam upper steel pipes, the secondary beam connecting section steel is connected between one secondary beam upper steel pipe and the secondary beam lower steel pipe, and the secondary beam connecting section steel is connected between the other secondary beam upper steel pipe and the secondary beam lower steel pipe, the number of the secondary beam connecting section steel is multiple, and the secondary beam connecting section steel and the secondary beam upper steel pipe are arranged in an end-to-end N shape.
Preferably, the main beam further comprises: two main beam anchors;
two ends of the main beam prestressed tendon are respectively fixed at two ends of the steel pipe at the lower part of the main beam one by one through two main beam anchors;
the secondary beam further comprises: two secondary beam anchorages;
and two ends of the secondary beam prestressed tendon are respectively fixed at two ends of the steel pipe at the lower part of the secondary beam one by one through two secondary beam anchors.
Preferably, a steel pipe in the column is arranged in the steel pipe concrete column, two pouring reserved openings which are in butt joint fit with corresponding corners of the large-span precast beam frame are formed in beam column nodes of the steel pipe concrete column, and the pouring reserved openings are communicated with the pipe wall of the steel pipe in the column.
Preferably, when the outer diameter of the steel pipe in the column is larger than the span of the steel pipes on the upper parts of the two main beams; the end parts of the steel pipes at the upper parts of the two main beams are respectively positioned in the pouring reserved openings and are assembled and connected with the pipe walls of the steel pipes in the columns; the end part of the steel pipe at the lower part of the main beam is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe in the column;
or when the outer diameter of the steel pipe in the column is smaller than the span of the steel pipes at the upper parts of the two main beams; the steel tube concrete column also comprises two steel plates; the two steel plates are respectively arranged on two sides of the pipe wall of the steel pipe pair positioned in the column, and the pouring reserved opening extends inwards to be communicated with the two steel plates; the end parts of the steel pipes at the upper parts of the two main beams are positioned in the pouring reserved openings and are respectively assembled and connected with the two steel plates; and the end part of the steel pipe at the lower part of the main beam is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe in the column.
Preferably, when the outer diameter of the steel pipe in the column is larger than the span of the steel pipes on the upper parts of the two main beams; the steel tube concrete column also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beam is arranged on the pipe wall of the steel pipe pair in the column, which is positioned at the pouring reserved opening; the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; the girder still includes the girder end plate: the main beam end plates are respectively and vertically connected with the end parts of the main beam lower steel pipe and the two main beam upper steel pipes; the steel pipe end plate in the column and the main beam end plate are in alignment assembly connection through a high-strength bolt assembly;
or when the outer diameter of the steel pipe in the column is smaller than the span of the steel pipes at the upper parts of the two main beams; the steel tube concrete column also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beams are respectively and vertically arranged on the two steel plates; the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; the girder still includes the girder end plate: the main beam end plates are respectively and vertically connected with the end parts of the main beam lower steel pipe and the two main beam upper steel pipes; the steel pipe end plate in the column and the main beam end plate are in alignment assembly connection through a high-strength bolt assembly.
Preferably, the high-strength bolt of the high-strength bolt assembly is made of a super-elastic shape memory alloy.
Preferably, the concrete-filled steel tubular column further comprises in-column construction steel bars, roll-welded spiral stirrups, concrete and in-column steel tubes;
the steel pipe in the column is arranged in the constructional steel bar in the column; the roll welding spiral stirrup is arranged on the outer peripheral wall of the steel pipe in the column; the concrete is respectively poured in the steel pipe in the column and the constructional steel bar in the column, and the concrete is provided with the pouring reserved opening.
Preferably, the method further comprises the following steps: and the floor bearing plate is arranged at the top of the large-span precast beam.
According to the technical scheme, the large-span prefabricated assembled structure provided by the invention is convenient to provide a large-span frame structure through the organic combination of the large-span precast beam and the plurality of steel pipe concrete columns A, so that the problems of limited span and low flexibility of use function of building space in the existing building industry are solved.
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 general plan view of a large span prefabricated structure provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a reserved beam-column joint of a large-size concrete-filled steel tubular column according to an embodiment of the present invention;
FIG. 3 is a schematic view of a reserved beam column node of a small-size concrete-filled steel tubular column according to an embodiment of the present invention;
FIG. 4 is a detailed assembly diagram of a beam column node reserved for a small-sized concrete-filled steel tubular column according to an embodiment of the present invention;
FIG. 5 is a longitudinal cross-sectional view of a beam-column joint provided by an embodiment of the present invention;
FIG. 6 is a detailed view of the connection between the secondary beam and the primary beam according to the embodiment of the present invention;
FIG. 7 is a detailed view of the connection between the secondary beams according to the embodiment of the present invention;
FIG. 8 is a schematic diagram of the connection of a concrete filled steel tubular beam to a deck and the location of a pipeline through the beam according to an embodiment of the present invention;
fig. 9 is a schematic view of a connection mode between steel pipes in a long-span precast beam according to an embodiment of the present invention.
A is a steel pipe concrete column; b is the position of the pipeline passing through the beam; c is a main beam; d is a secondary beam;
1, constructing longitudinal ribs in the column; 2 is concrete; 3 is a steel pipe in the column; 4 is a stirrup in the column; 5 is a steel pipe at the upper part of the main beam; 6 is a steel pipe at the lower part of the main beam; 7 is a steel plate; 8 is roll welding spiral stirrup; 9 is a main beam prestressed tendon; 10 is angle steel; 11 is a main beam anchorage device; 12 is a backing plate; 13 is main beam connecting section steel; 14 is beam column angle steel; 15 is a floor support plate; 16 is a floor support plate connecting bolt; 17 is a steel pipe at the lower part of the secondary beam; 18 is a steel pipe at the upper part of the secondary beam; 19 is a secondary beam connecting section steel; 20 is main beam concrete; 21 is a secondary beam prestressed tendon; and 22 is secondary beam concrete.
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.
The large-span prefabricated assembled structure provided by the embodiment of the invention comprises a large-span prefabricated beam and a plurality of concrete-filled steel tubular columns A as shown in figure 1;
the large-span precast beam comprises a plurality of main beams C and a plurality of secondary beams D; the steel tube concrete columns A are used for being correspondingly assembled and connected with a plurality of corners of the large-span precast beam frame one by one, and the main beams C and the secondary beams D are all prestressed steel frame beam structures;
as shown in fig. 6, the girder C includes: the steel pipes 6 at the lower parts of the main beams, the steel pipes 5 at the upper parts of the two main beams, the main beam connecting section steel 13, the main beam prestressed tendons 9 and the main beam concrete 20;
the steel pipes 5 at the upper parts of the two main beams are arranged in parallel; the main beam lower steel pipes 6 are respectively parallel to the two main beam upper steel pipes 5 and are positioned below the middle of the two main beam upper steel pipes 5; every two of the main beam lower steel pipe 6 and the two main beam upper steel pipes 5 are connected through main beam connecting section steel 13; the scheme is that the connection and fixation of three main beam steel pipes are realized through the main beam connection section steel 13 so as to form a triangular steel frame main beam; the girder prestressed tendons 9 are arranged in the girder lower steel pipes 6 so as to enhance the tensile property of the girder lower steel pipes 6; the main beam concrete 20 is respectively poured in the main beam lower steel tube 6 and the two main beam upper steel tubes 5.
It should be noted that, as shown in fig. 1, the frame of the large-span precast beam in the scheme is a square frame; the secondary beam D comprises a long secondary beam and a short secondary beam; a plurality of long secondary beams are connected between the first pair of main beams C of the large-span precast beam frame; a plurality of short secondary beams are connected between the single beam and the long secondary beam of the second pair of main beams C of the large-span precast beam frame and between two adjacent long secondary beams; that is to say, the secondary beam in this scheme is connected with both main beam and its adjacent secondary beam cross connection. In addition, this scheme has only set up steel core concrete column A at the corner of large-span precast beam, and the no post of the rest, and can provide powerful support through steel core concrete column A, and be prestressing steel frame beam structure based on large-span precast beam monomer roof beam, better performance of spaning has, especially girder C's triangle steel frame structure has better tensile property and stability, thereby help providing a large-span frame construction, make this structure possess higher flexibility, just also can provide enough big frame space and accessible, can supply the user to change at will and adjust the size in space, can fully provided user's different demands.
According to the technical scheme, the large-span prefabricated assembled structure provided by the embodiment of the invention is convenient to provide a large-span frame structure through the organic combination of the large-span precast beam and the plurality of steel pipe concrete columns A, so that the problems of limited span and low flexibility of the use function of the building space in the current building industry are solved.
In this embodiment, as shown in fig. 7, the secondary beam D includes: the steel pipes 17 at the lower parts of the secondary beams, the steel pipes 18 at the upper parts of the two secondary beams, the connecting section steel 19 of the secondary beams, the prestressed ribs 21 of the secondary beams and the concrete 22 of the secondary beams;
the steel pipes 18 at the upper parts of the two secondary beams are arranged in parallel; the secondary beam lower steel pipes 17 are respectively parallel to the two secondary beam upper steel pipes 18 and are positioned below the middle of the two secondary beam upper steel pipes 18; the secondary beam lower steel pipe 17 and the two secondary beam upper steel pipes 18 are connected with each other through the secondary beam connecting section steel 19; the scheme is that the connection and fixation of three secondary beam steel pipes are realized by the secondary beam connecting section steel 19 so as to form a triangular steel frame secondary beam; the secondary beam prestressed tendons 21 are arranged in the secondary beam lower steel pipes 17 so as to enhance the tensile property of the secondary beam lower steel pipes 17; the secondary beam concrete 22 is respectively poured in the secondary beam lower steel tube 17 and the two secondary beam upper steel tubes 18.
That is to say, the monomer roof beam of large-span precast beam in this scheme (including girder and secondary beam) comprises two upper portion steel pipes, lower part steel pipe and the connection shaped steel that is used for connecting three steel pipe, all is provided with the prestressing tendons in the lower part steel pipe in addition and bears the pulling force to all pour concrete formation steel pipe concrete in the three steel pipe. The design of this scheme has that the structure is retrencied, the structure is light and convenient and stride across characteristics such as good performance. More importantly, the large-span precast beam of this scheme compares in traditional reinforced concrete roof beam, it is hollow prestressing force steel frame beam structure, as shown in fig. 8, only two upper portion steel pipes and a lower part steel pipe to couple together three steel pipe through connection shaped steel, other places are hollow, can make supporting facility-water and electricity spool in house all can follow the clearance of upper portion steel pipe and lower part steel pipe and pass through, thereby reach roof beam and pipeline separation's purpose, and if meet some circuit or pipeline when the problem, also convenient in time overhaul, maintenance and change simultaneously.
Further, as described above, the ends of the long minor beams are connected to the major beams; as shown in fig. 6, the connection mode between the end of the long secondary beam and the main beam is specifically as follows: the end parts of the two secondary beam upper steel pipes 18 are connected with the pipe wall of the main beam upper steel pipe 5 close to the secondary beam D;
the large-span precast beam also comprises angle steel 10;
the length of the secondary beam lower steel pipe 17 is greater than that of the secondary beam upper steel pipe 18, and the end part of the secondary beam lower steel pipe extends to the upper part of the main beam lower steel pipe 6; the secondary beam lower steel pipe 17 is connected with the main beam lower steel pipe 6 through angle steel 10. That is, the connection mode of the main beam and the secondary beam in the large-span precast beam is that two upper steel pipes of the secondary beam are directly connected with the upper steel pipe of the main beam through welding, and the length of the lower steel pipe of the secondary beam is longer than that of the upper steel pipe of the secondary beam, so that the lower steel pipe of the secondary beam mainly extends into a gap between the upper steel pipe and the lower steel pipe of the main beam and is connected to the lower steel pipe of the main beam through angle steel; the connection mode of girder and secondary beam so design in this scheme has simple structure, connects characteristics such as simple and convenient and connect firmly.
Still further, as described above, the ends of the short minor beams are connected to the long minor beams; as shown in fig. 7, the connection mode between the end of the short secondary beam and the long secondary beam is specifically as follows: the end parts of the two secondary beam upper steel pipes 18 are connected with the pipe wall of the adjacent secondary beam upper steel pipe 5; the end of the secondary beam lower steel pipe 17 is connected with the pipe wall of the adjacent secondary beam lower steel pipe 17. That is to say, the connection mode of two secondary beams (long secondary beam and short secondary beam) in the large-span precast beam is as follows: and upper steel pipes corresponding to the two secondary beams are welded with the upper steel pipes, and lower steel pipes are welded with the lower steel pipes.
Specifically, as shown in fig. 9, a plurality of main beam connection section steels 13 are connected between two main beam upper steel pipes 5, a plurality of main beam connection section steels 13 are connected between one main beam upper steel pipe 5 and one main beam lower steel pipe 6, and a plurality of main beam connection section steels 13 are connected between the other main beam upper steel pipe 5 and the main beam lower steel pipe 6, and are arranged in an N-shape in an end-to-end manner; that is, the connection shape of the main beam connection section steel 13 at each connection region is N-shaped, so that the main beam can form a triangular staggered truss girder structure, which can help to further improve the structural rigidity and stability of the main beam;
the number of the secondary beam connecting section steel 19 connected between the two secondary beam upper steel pipes 18, the number of the secondary beam connecting section steel 19 connected between one secondary beam upper steel pipe 18 and one secondary beam lower steel pipe 17, and the number of the secondary beam connecting section steel 19 connected between the other secondary beam upper steel pipe 18 and the secondary beam lower steel pipe 17 are multiple, and the secondary beam connecting section steel 19 are arranged in an end-to-end N shape. Similarly, the connection shape of the secondary beam connection section steel 19 at each connection region is N-shaped, so that the secondary beam can form a triangular staggered truss girder structure, which can help to further improve the structural rigidity and stability of the secondary beam, and thus is beneficial to further improving the structural rigidity and stability of the whole large-span precast beam.
In this scheme, girder C still includes: two main beam anchorages 11;
as shown in fig. 5, two ends of the main beam prestressed tendons 9 are respectively fixed to two ends of the main beam lower steel pipe 6 through two main beam anchors 11, so that the main beam prestressed tendons 9 can be firmly installed in the main beam lower steel pipe 6;
the secondary beam D further includes: two secondary beam anchorages;
the two ends of the secondary beam prestressed tendon 21 are fixed to the two ends of the secondary beam lower steel pipe 17 one by one through two secondary beam anchors, so that the secondary beam prestressed tendon 21 can be fastened and installed in the secondary beam lower steel pipe 17.
Specifically, as shown in fig. 2 and 3, a steel tube in column 3 is arranged in the steel tube concrete column a, two pouring reserved openings used for being in butt joint fit with corresponding corners of the large-span precast beam frame are formed in beam column nodes of the steel tube concrete column a, and each pouring reserved opening is communicated with the tube wall of the steel tube in column 3. That is to say, this scheme reserves enough and the unilateral girder at the beam column node of prefabricated steel core concrete column A and carries out the on-the-spot welding (steel pipe 3 and girder welding in the post) and reserves the mouth, waits to arrive after being connected with the girder on-the-spot, again to should pour reserve the mouth and carry out high-pressure shotcrete and finally floating. This scheme design so to realized that large-span precast beam is connected with a plurality of steel core concrete column A's assembled, makeed the large-span frame construction of this scheme have characteristics such as the construction progress is fast, efficiency of construction height.
Further, as can be seen from the above, the end of the main beam is connected to the steel pipe concrete column a; the connection mode of the two is as follows: when the outer diameter of the steel pipe 3 in the column is larger than the span of the steel pipes 5 at the upper parts of the two main beams; the end parts of the steel pipes 5 at the upper parts of the two main girders are respectively positioned in the pouring reserved openings and are assembled and connected with the pipe walls of the steel pipes 3 in the columns; the end part of the steel pipe 6 at the lower part of the girder is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe 3 in the column;
or, when the outer diameter of the steel pipe 3 in the column is smaller than the span of the steel pipes 6 at the upper parts of the two main beams; the steel tube concrete column A also comprises two steel plates 7; as shown in fig. 3 and 4, two steel plates 7 are respectively arranged on two sides of the pipe wall of the pouring reserved opening of the steel pipe 3 in the column, and the pouring reserved opening extends inwards to communicate the two steel plates 7; the end parts of the steel pipes 5 at the upper parts of the two main beams are positioned in the pouring reserved openings and are respectively assembled and connected with the two steel plates 7; the end part of the steel pipe 6 at the lower part of the main beam is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe 3 in the column. Of course, as shown in fig. 5, beam-column angle steel can be additionally arranged between the end part of the steel pipe 6 at the lower part of the main beam and the pipe wall of the steel pipe 3 in the column, so that the connection strength of the two can be further enhanced.
That is to say, this scheme has included the connected mode of steel pipe 3 and girder in the jumbo size post, and the connected mode of steel pipe 3 and girder in the small-size post. When the steel pipes 3 in the columns are small enough to be connected with the main beam completely, the steel plates 7 can be welded at corresponding positions to increase the connection area (as shown in fig. 3) so as to ensure that the main beam can be connected with the steel pipes 3 in the small-size columns.
Specifically, when the outer diameter of the steel pipe 3 in the column is larger than the span of the steel pipes 5 on the upper parts of the two main beams; the steel tube concrete column A also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beam is arranged on the wall of the steel pipe 3 pair in the column, which is positioned at the pouring reserved opening; the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; girder C still includes girder end plate: the girder end plates are respectively and vertically connected with the end parts of the girder lower steel pipes 6 and the two girder upper steel pipes 5 (end plate stiffening ribs can be additionally arranged between the girder end plates and the girder steel pipes); the steel pipe end plate in the column and the girder end plate are in alignment assembly connection through a high-strength bolt assembly; that is, when the steel pipe 3 in the column is a large-size steel pipe in the column, the steel pipe end plate in the column and the main beam end plate can be aligned, assembled and connected to realize the assembly type connection of the corner of the large-span precast beam and the steel pipe concrete column A with the built-in large-size steel pipe in the column, and the assembly connection mode has the characteristics of simple structure, stable and reliable assembly and splicing and the like; in addition, the steel pipe end plate in the column and the main beam end plate are provided with aligned bolt holes at corresponding positions;
or when the outer diameter of the steel pipe 3 in the column is smaller than the span of the steel pipes 6 at the upper parts of the two main beams; the steel tube concrete column A also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beams are respectively and vertically arranged on the two steel plates 7; the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; girder C still includes girder end plate: the girder end plates are respectively and vertically connected with the end parts of the girder lower steel pipes 6 and the two girder upper steel pipes 5 (end plate stiffening ribs can be additionally arranged between the girder end plates and the girder steel pipes); the steel pipe end plate and the girder end plate in the column are in alignment assembly connection through the high-strength bolt assembly. That is to say, similarly, when the steel pipe 3 in the column is a small-size steel pipe in the column, the steel pipe end plate in the column and the main beam end plate can be aligned, assembled and connected to realize the assembly connection of the corner of the large-span precast beam and the steel pipe concrete column A with the built-in small-size steel pipe in the column, and the assembly connection mode has the characteristics of simple structure, stable and reliable assembly and splicing and the like; of course, the steel pipe end plate and the girder end plate in the column are provided with the bolt holes for contraposition at the corresponding positions.
Further, the high-strength bolt of the high-strength bolt assembly is made of the superelasticity shape memory alloy bar, has superelasticity deformability, and can dissipate vibration energy of the node through deformation during a strong earthquake so that the node is not damaged after the earthquake.
Still further, as shown in fig. 1 and 2, the steel tube concrete column a includes in-column construction steel bars, roll-welded spiral stirrups 8, concrete 2, and in-column steel tubes 3;
the steel pipe 3 in the column is arranged in the constructional steel bar in the column; the roll-welding spiral stirrup 8 is arranged on the outer peripheral wall of the steel pipe 3 in the column and is used for enhancing the shearing-resistant bearing capacity of the steel pipe 3 in the column and increasing the bonding strength between the steel pipe 3 in the column and external concrete; concrete 2 is poured respectively in the steel pipe 3 in the post and the constructional steel bar in the post, and concrete 2 has seted up pours and has reserved the mouth. The concrete filled steel tubular column A has good compressive strength and high bearing capacity due to the design.
In this embodiment, as shown in fig. 8, the large-span prefabricated structure provided by the embodiment of the present invention further includes: and the floor bearing plate 15 is arranged on the top of the large-span precast beam. The floor support plate 15 can be fixedly connected with the large-span precast beam through bolts, and then concrete is poured on the floor support plate 15. This scheme is through adopting building carrier plate 15, can reduce the quantity of concrete, saves a large amount of interim templates, can save most formwork support, also can regard as the reinforcing bar that is drawn to use, reduces the installation of reinforcing bar to help reducing the construction link, shorten construction period, reduce engineering cost.
The present solution is further described below with reference to specific embodiments:
the invention aims to provide a large-span assembly splicing structure which is used for solving the problems of pipeline separation and use function flexibility in the current building industry.
The invention provides a large-span prefabricated assembly type structure which is a large-span frame structure. The large-span precast beam comprises a steel tube concrete column A and a large-span precast beam (comprising a main beam and a secondary beam);
the steel tube concrete column A comprises four-corner structural longitudinal ribs, a steel tube 3 in the column, stirrups and seam-welded spiral stirrups 8, wherein the four-corner structural longitudinal ribs are not stressed, the size of the steel tube 3 in the column is determined according to actual conditions, when the steel tube 3 in the column is small, steel plates 7 can be welded at corresponding positions to increase the connection area (shown in figure 3) when the steel tube 3 in the column is not fully connected with a beam, specifically, enough steel plates 7 connected with the steel tubes 5 at the upper parts of the main beams are respectively welded at two sides of the corresponding positions of the steel tube in the column, then the steel tubes 5 at the upper parts of the two main beams are welded with the corresponding steel plates 7 in a mode shown in figure 4, and the steel tubes 6 at the lower parts of the main beams are welded with the steel tubes 3 in the column;
the large-span precast beam (comprising a main beam and a secondary beam) comprises two steel pipes on the upper part, steel pipes on the lower part, prestressed tendons, angle steel 10, an anchorage device, a base plate, connecting section steel and concrete in the steel pipes. Wherein, the two steel pipes at the upper part and the upper steel pipe and the lower steel pipe are welded and connected through the connecting section steel to form a staggered truss structure, and the welding shape of the connecting section steel is 'N' -shaped (as shown in figure 9).
This structure possesses higher flexibility, and the concrete presentation is only set up in the four corners of structure at the post of this structure, and the rest does not have the post, and the post size is not big. The structure can provide enough large space without barriers, can be used for users to change and adjust the size of a room at will, and can fully meet the requirements of the users.
In order to facilitate transportation and save transportation cost, the concrete in the steel pipe in the column can be poured on site, but the rest parts are prefabricated in factories; the roll welding spiral stirrup 8 is welded on the outer side of the steel pipe in the column and is used for enhancing the shearing-resistant bearing capacity of the steel pipe and increasing the adhesion of the steel pipe and external concrete.
The concrete-filled steel tube column reserves a part of the concrete-filled steel tube column, which is enough to be connected with the beam on site, at the beam column node, concrete is not poured, high-pressure concrete spraying is carried out on the part of the concrete-filled steel tube column, which is not poured with the concrete, after the concrete-filled steel tube column is connected with the beam on site, and finally, the concrete is screeded; the beam-column connection mode is welding connection, namely, the steel pipes in the column and the steel pipes in the beam are connected together in a welding mode.
The large-span precast beam is different from the traditional concrete beam in that the middle part is hollow, only two steel pipes at the upper part and one steel pipe at the lower part are welded through connecting section steel, and other parts are hollow, so that supporting facilities of a house, namely water and electricity pipelines, can pass through a gap between the steel pipes at the upper part and the lower part of the beam (as shown in figure 8), and the aim of separating the beam, the column and the plate from pipelines is fulfilled; the pipeline and the large-span precast beam are shielded by the suspended ceiling in the decoration stage, wherein the height of the suspended ceiling is at least the vertical distance between the lowest end of the large-span precast beam and the upper floor. However, the exterior of the large-span precast beam needs to be coated with fireproof and anticorrosive coatings to improve the durability of the large-span precast beam, and the large-span precast beam also needs to be maintained regularly.
The prestressed tendons in the lower steel pipes (the main beams and the secondary beams) mainly bear tension, and the prestressed tendons stretch the prestressed tendons through a post-tensioning method and are anchored at the end parts of the lower steel pipes by using an anchorage device (the specific positions are shown in figure 5); the angle steel is used for reinforcing the connection between the steel pipe in the column and the steel pipe in the large-span precast beam.
The connection mode of the main beam and the secondary beam in the large-span precast beam (comprising the main beam and the secondary beam) is that two steel pipes at the upper part of the secondary beam are directly connected with the steel pipes at the upper part of the main beam through welding, and the length of the steel pipes at the lower part of the secondary beam is longer than that of the two steel pipes at the upper part, and the main application is that the steel pipes extend into a gap between the steel pipes at the upper part and the lower part of the main beam and are connected with the steel pipes of the main beam through angle steel (as shown in figure 6); in addition, the connection mode of the secondary beam and the secondary beam is as follows: and the corresponding upper steel pipe is welded with the upper steel pipe, and the lower steel pipe is welded with the lower steel pipe.
The floor slab in the large-span frame structure can be a prefabricated laminated slab or a floor bearing plate and cast-in-place mode; wherein, the floor bearing plate is connected fixedly with the large-span precast beam through the bolt, and then concrete is poured on the floor bearing plate. Wherein the application of floor carrier plate can reduce the quantity of concrete, saves a large amount of interim templates, can save most template supports, also can regard as the pulled reinforcing bar to use, reduces the installation of reinforcing bar to reduce the construction link, shorten construction period, reduce engineering cost.
The water and electricity conduit can pass through the gap between the upper steel pipe and the lower steel pipe of the beam (as shown in figure 8), so that the beam, the column and the plate can be separated from the pipeline. If some circuits or pipelines have problems, the pipeline inspection device is convenient to overhaul, maintain and replace in time.
According to the technical scheme provided by the invention, the large-span prefabricated assembly type structure provided by the embodiment of the invention has the advantages that the prefabrication work is completed in a factory and spliced on site, the related large-span prefabricated beam can well solve the problems of pipeline separation, pipeline overhaul and replacement in the house building at the current stage, and the large-span frame structure has the another characteristic of well solving the problem of flexibility of use functions of the house building at the current stage and can be used for randomly replacing the required space according to the requirements of an owner. The method has the advantages of simple and convenient field operation, quick construction progress and high construction efficiency; the node structure design is greatly simplified, the factory prefabrication is convenient, and the replacement and the disassembly are easy.
In summary, the present invention provides a large-span prefabricated assembly structure, which is a large-span frame structure, and includes prefabricated concrete columns with four corners being structural ribs and a middle being a steel pipe (the columns are distributed at the four corners of the frame structure) and a large-span prefabricated beam, wherein the prefabricated concrete columns reserve a part at the beam column node, which is enough to be connected with the beam in situ, without casting concrete, and after the prefabricated concrete columns are connected with the beam in situ, the part without casting concrete is subjected to high pressure concrete spraying, and finally, the concrete is leveled. The concrete in the steel pipe in the precast concrete column can be conveniently transported and the transportation cost is reduced, post-cast can be carried out on site, but other parts need to be precast in a factory; the large-span precast beam is composed of an upper steel pipe, a lower steel pipe and connecting section steel for connecting the two steel pipes, wherein a prestressed tendon is placed in the lower steel pipe to bear tension, the upper part and the lower part of the steel pipe concrete are welded together through the connecting section steel, the welding mode is a mode of connecting the upper part and the lower part of the steel pipe concrete in pairs, and the connecting shape of the connecting section steel is in an N shape. The assembly structure is mainly used for solving the problems of pipeline separation and flexibility of use functions in the existing building construction. The development direction of the future Chinese buildings is to develop towards the direction of more energy conservation, greenness, durability and flexibility.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A large-span prefabricated assembled structure is characterized by comprising a large-span prefabricated beam and a plurality of steel tube concrete columns (A);
the large-span precast beam comprises a plurality of main beams (C) and a plurality of secondary beams (D); the main beams (C) can surround to form a large-span precast beam frame, the secondary beams (D) are connected in the large-span precast beam frame in a cross mode, the steel tube concrete columns (A) are used for being correspondingly assembled and connected with corners of the large-span precast beam frame one by one, and the main beams (C) and the secondary beams (D) are all prestressed steel frame beam structures;
the main beam (C) comprises: the steel pipes (6) at the lower parts of the main beams, the steel pipes (5) at the upper parts of the two main beams, main beam connecting section steel (13), main beam prestressed tendons (9) and main beam concrete (20);
the steel pipes (5) at the upper parts of the two main beams are arranged in parallel; the main beam lower steel pipes (6) are respectively parallel to the two main beam upper steel pipes (5) and are positioned below the middle of the two main beam upper steel pipes (5); the lower steel pipe (6) of the main beam and the upper steel pipes (5) of the two main beams are connected with each other through the main beam connecting section steel (13); the main beam prestressed tendons (9) are arranged in the main beam lower steel pipes (6); and the main beam concrete (20) is respectively poured in the main beam lower steel tube (6) and the two main beam upper steel tubes (5).
2. The large-span prefabricated structure according to claim 1, wherein said secondary beams (D) comprise: the steel pipes (17) at the lower parts of the secondary beams, the steel pipes (18) at the upper parts of the two secondary beams, the connecting section steel (19) of the secondary beams, the prestressed tendons (21) of the secondary beams and the concrete (22) of the secondary beams;
the steel pipes (18) at the upper parts of the two secondary beams are arranged in parallel; the secondary beam lower steel pipes (17) are respectively parallel to the two secondary beam upper steel pipes (18) and are positioned below the middle of the two secondary beam upper steel pipes (18); the secondary beam lower steel pipe (17) and the two secondary beam upper steel pipes (18) are connected in pairs through the secondary beam connecting section steel (19); the secondary beam prestressed tendons (21) are arranged in the steel pipes (17) at the lower parts of the secondary beams; and the secondary beam concrete (22) is respectively poured in the secondary beam lower steel pipe (17) and the two secondary beam upper steel pipes (18).
3. The large-span prefabricated structure according to claim 2, wherein the ends of the two secondary beam upper steel pipes (18) are connected with the pipe wall of the main beam upper steel pipe (5) close to the secondary beam (D);
the large-span precast beam also comprises angle steel (10);
the length of the secondary beam lower steel pipe (17) is greater than that of the secondary beam upper steel pipe (18), and the end part of the secondary beam lower steel pipe extends to the upper part of the main beam lower steel pipe (6); the secondary beam lower steel pipe (17) is connected with the main beam lower steel pipe (6) through the angle steel (10);
the end parts of the two secondary beam upper steel pipes (18) are connected with the pipe walls of the adjacent secondary beam upper steel pipes (5); and the end part of the secondary beam lower steel pipe (17) is connected with the pipe wall of the adjacent secondary beam lower steel pipe (17).
4. The large-span prefabricated assembled structure according to claim 2, wherein the number of the main beam connection section steels (13) connected between two main beam upper steel pipes (5), the number of the main beam connection section steels (13) connected between one main beam upper steel pipe (5) and one main beam lower steel pipe (6), and the number of the main beam connection section steels (13) connected between the other main beam upper steel pipe (5) and the main beam lower steel pipe (6) are multiple and are arranged in an end-to-end N shape;
the secondary beam connecting section steel (19) is connected between the two secondary beam upper steel pipes (18), the secondary beam connecting section steel (19) is connected between one secondary beam upper steel pipe (18) and the secondary beam lower steel pipe (17), and the secondary beam connecting section steel (19) is connected between the secondary beam upper steel pipe (18) and the secondary beam lower steel pipe (17), the number of the secondary beam connecting section steel (19) is multiple, and the secondary beam connecting section steel (19) is arranged in an N shape with the head and the tail connected.
5. The large-span prefabricated structure according to claim 2, wherein said main beam (C) further comprises: two main beam anchorages (11);
two ends of the main beam prestressed tendon (9) are respectively fixed at two ends of the main beam lower steel pipe (6) one by one through two main beam anchors (11);
the secondary beam (D) further comprises: two secondary beam anchorages;
and two ends of the secondary beam prestressed tendon (21) are respectively fixed at two ends of the secondary beam lower steel pipe (17) one by one through two secondary beam anchors.
6. The large-span prefabricated assembled structure according to claim 1, wherein a steel tube in column (3) is arranged in the steel tube concrete column (A), two pouring reserved openings for butt-joint matching with corresponding corners of the large-span precast beam frame are formed at beam-column nodes of the steel tube concrete column (A), and each pouring reserved opening is communicated with the tube wall of the steel tube in column (3).
7. The large-span prefabricated structure according to claim 6, wherein when the outer diameter of the steel pipe (3) in the column is greater than the span of the two main girder upper steel pipes (5); the end parts of the steel pipes (5) at the upper parts of the two main beams are respectively positioned in the pouring reserved openings and are assembled and connected with the pipe walls of the steel pipes (3) in the columns; the end part of the steel pipe (6) at the lower part of the girder is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe (3) in the column;
or when the outer diameter of the steel pipe (3) in the column is smaller than the span of the steel pipes (6) at the upper parts of the two main beams; the steel tube concrete column (A) also comprises two steel plates (7); the two steel plates (7) are respectively arranged on two sides of the pipe wall of the steel pipe (3) in the column, which are opposite to the pouring reserved opening, and the pouring reserved opening extends inwards to be communicated with the two steel plates (7); the end parts of the steel pipes (5) at the upper parts of the two main beams are positioned in the pouring reserved openings and are respectively assembled and connected with the two steel plates (7); the end part of the steel pipe (6) at the lower part of the main beam is positioned in the pouring reserved opening and is assembled and connected with the pipe wall of the steel pipe (3) in the column.
8. The large-span prefabricated structure according to claim 7, wherein when the outer diameter of the steel pipe (3) in the column is greater than the span of the two main girder upper steel pipes (5); the steel tube concrete column (A) also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beam is arranged on the pipe wall of the pouring reserved opening of the steel pipe (3) in the column; the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; the girder (C) further comprises a girder end plate: the girder end plates are respectively and vertically connected with the end parts of the girder lower steel pipes (6) and the two girder upper steel pipes (5); the steel pipe end plate in the column and the main beam end plate are in alignment assembly connection through a high-strength bolt assembly;
or when the outer diameter of the steel pipe (3) in the column is smaller than the span of the steel pipes (6) at the upper parts of the two main beams; the steel tube concrete column (A) also comprises a steel tube end plate in the column and a cantilever beam; the cantilever beams are respectively and vertically arranged on the two steel plates (7); the steel pipe end plate in the column is vertically connected with the end part of the cantilever beam; the girder (C) further comprises a girder end plate: the girder end plates are respectively and vertically connected with the end parts of the girder lower steel pipes (6) and the two girder upper steel pipes (5); the steel pipe end plate in the column and the main beam end plate are in alignment assembly connection through a high-strength bolt assembly.
9. The large-span prefabricated structure of claim 8, wherein said high-strength bolt of said high-strength bolt assembly is made of a material including superelastic shape memory alloy.
10. The large span precast fabricated structure of claim 8, wherein the steel core concrete column (a) further comprises in-column construction steel bars, seam-welded helical stirrups (8), concrete (2) and the in-column steel pipes (3);
the steel pipe (3) in the column is arranged in the constructional steel bar in the column; the roll welding spiral stirrup (8) is arranged on the outer peripheral wall of the steel pipe (3) in the column; the concrete (2) is respectively poured in the steel tube (3) in the column and the constructional steel bar in the column, and the concrete (2) is provided with the pouring reserved opening.
11. The large-span prefabricated structure according to claim 1, further comprising: and the floor bearing plate (15) is arranged at the top of the large-span precast beam.
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| CN111206680A (en) * | 2019-09-30 | 2020-05-29 | 上海欧本钢结构有限公司 | Combined floor system frame structure building system |
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| JP2000328653A (en) * | 1999-05-17 | 2000-11-28 | Shimizu Corp | Structure of building |
| CN103967209A (en) * | 2014-04-12 | 2014-08-06 | 北京工业大学 | Combined column formed by embedding round steel tube filled with recycled concrete in square steel tube filled with concrete and reinforced by spiral hoop |
| CN107034988A (en) * | 2017-04-27 | 2017-08-11 | 重庆大学 | A kind of assembling frame system of use hot rolling not uniform thickness U-shaped steel combination beam |
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Application publication date: 20220325 |