CN111962953B - A steel tube concrete column-H-shaped steel beam-steel support-π-shaped connector combined side column middle node and its construction method - Google Patents
A steel tube concrete column-H-shaped steel beam-steel support-π-shaped connector combined side column middle node and its construction method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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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
- E04B1/185—Connections not covered by E04B1/21 and E04B1/2403, e.g. connections between structural parts of different material
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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
- 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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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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
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
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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
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/023—Separate connecting devices for prefabricated floor-slabs
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Abstract
本发明公开了一种钢管混凝土柱‑H型钢梁‑钢支撑‑π形连接件组合式边柱中部节点及作法，该节点主要由轻型方钢管再生混凝土柱、H型钢梁、π形连接件、腹板连接板、高强螺栓、钢支撑、板凳钢筋以及预制再生混凝土局部楼板组成。本发明所述梁‑柱‑撑连接节点，对比现有技术，构造简单，装配率高，传力路径明确。具有两道抗震防线，π形连接件失效后，腹板连接板仍具备一定承载能力。π形连接件是钢支撑与梁柱节点的重要连接构造，不仅实现了钢支撑与节点的装配式连接还通过浇筑灌浆料加强了连接部位的强度与稳定性。该节点梁‑柱‑撑‑楼板连接牢固，整体性强，抗震性能优异，为装配式绿色轻钢组合结构的工程设计提供了关键技术支撑。
The present invention discloses a steel tube concrete column-H-shaped steel beam-steel support-π-shaped connector combined side column middle node and method, the node is mainly composed of a light square steel tube recycled concrete column, an H-shaped steel beam, a π-shaped connector, a web connection plate, high-strength bolts, a steel support, a bench steel bar and a prefabricated recycled concrete local floor. Compared with the prior art, the beam-column-support connection node of the present invention has a simple structure, a high assembly rate and a clear force transmission path. It has two anti-seismic lines, and after the π-shaped connector fails, the web connection plate still has a certain bearing capacity. The π-shaped connector is an important connection structure between the steel support and the beam-column node, which not only realizes the assembled connection between the steel support and the node, but also strengthens the strength and stability of the connection part by pouring grouting material. The node beam-column-support-floor connection is firm, has strong integrity, and excellent seismic performance, providing key technical support for the engineering design of assembled green light steel composite structures.
Description
Technical Field
The invention relates to a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column middle node and a manufacturing method thereof, and belongs to the technical field of structural engineering.
Background
In recent years, the assembled building technology in China is rapidly developed. The assembled building has the advantages of high construction efficiency, low construction cost, sustainable green circulation and the like. With the deep progress of town, the residential building of villages and towns has a greatly improved ratio in the total amount of new buildings in China, and has a dominant role in the new residential buildings. The application of the fabricated building is greatly promoted in village and town residential buildings, and has important significance for the urban process and the building industrialization development of China. Along with the promotion of sustainable development strategy, the environmental requirements of green energy conservation and emission reduction are also the necessary trend of the development of the building industry while the assembled building is promoted. Therefore, the development of the assembled structural system suitable for village green houses is a problem to be solved in the promotion of assembled green buildings and building industrialization in China.
The steel structure is an ideal structural system applied to the assembled building due to the advantages of light weight, high strength, easy forming, recycling and the like. However, the conventional steel structure system still has a plurality of problems when applied to the low-town multi-storey residential buildings. (1) The structural columns in the traditional steel structure building mostly adopt H-shaped steel columns, which is particularly common in steel structure plants. If the method is applied to a building with the aspect ratio close to 1 in village and town houses, the structural earthquake resistance is seriously affected by irregular rigidity distribution due to overlarge earthquake resistance difference between two earthquake-resistant main shaft directions of the structure due to the existence of a weak shaft of the H-shaped steel column. Meanwhile, buckling instability phenomenon of the bottom of the H-shaped steel column is easy to occur under the action of larger axial force and bending moment, and the overall stability of the structure is at risk. (2) The traditional steel structure beam column node forms mostly adopt the node forms such as outer annular plate, inner baffle and cast steel. Firstly, the node forms consume large amount of steel, have complex structure and high design difficulty. Meanwhile, the welding operation is inevitably needed in the field construction, so that the assembly efficiency is low, the method is not suitable for assembly type buildings, and the cost performance of the building with smaller load scale for village and town houses is low. Secondly, the nodes are in the form of integral nodes, namely, the same node domain is usually connected with primary and secondary beams in multiple directions, so that if the node domain is damaged, the risk of collapse of all the steel beams connected on the node is caused. And the structure arrangement is inflexible, so that the residential type arrangement is single. (3) Because of the small scale of village residential building loads, the cross-sectional dimensions of the structural columns are small, so that the structural columns alone serve as side force resisting members to reduce the side stiffness of the structure, and steel supports are required to be arranged between the columns to strengthen the overall side force resisting level of the structure. And the assembly of steel support can not be realized to traditional steel construction node. (4) the conventional steel structure node structure is complex. Most node forms have reinforcing structures such as diagonal stiffeners in the node area, and these special-shaped structures increase the difficulty of standardized fabricated panels and the application of fabricated floors in steel structures.
Based on the above, the development of a novel fabricated steel structure node which is reliable in earthquake resistance, high in assembly degree and suitable for village and town houses is a problem to be solved urgently. The invention provides a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column middle node and a manufacturing method. The vertical bearing member of the node adopts a composite structural member of a steel pipe concrete column, the vertical bearing capacity is stronger, and the earthquake resistance performance of the two main shaft directions is the same. And the mechanical property of the steel column under the complex stress state is obviously superior to that of an H-shaped steel column in a traditional steel structure. The frame structure formed by the light steel pipe concrete column and the H-shaped steel beam is called a light steel frame combined frame structure. Meanwhile, the node structure carries out integrated design on the beam, the column, the steel support and the assembled floor slab, and the integral assembly of the components connected by the node is completely realized.
Disclosure of Invention
The invention aims to provide a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column middle node and a manufacturing method thereof, so as to solve the defects of low assembly efficiency, unreasonable stress, poor earthquake resistance and the like of a light steel frame house middle beam column node. And meanwhile, the beam, the column, the floor slab and the steel support at the side column node in the middle of the frame achieve the integrated assembly effect.
In order to achieve the above purpose, the invention adopts the following technical scheme: the joint comprises a light square steel pipe recycled concrete column (1), an H-shaped steel beam (2), a pi-shaped connecting piece (3), a web connecting plate (4), a 30mm long high-strength bolt (5), a floor shear stud (6), an outer side fillet weld (10), an inner side fillet weld (11), an upper steel support (12), a lower steel support (13), a 70mm through high-strength bolt (14), a bench steel bar (15), a grouting material supporting plate (16), a prefabricated recycled concrete floor slab (17) and a floor steel bar (18).
The pi-shaped connecting piece (3) is formed by welding an upper limb (7) of the pi-shaped connecting piece and a lower limb (8) of the pi-shaped connecting piece on a rectangular bottom plate (9) with a central hole through a right angle fillet weld, the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are vertically symmetrical, and the side parts of the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are connected through the rectangular bottom plate (9); the pi-shaped connecting piece (3) is connected with the side face of the light square steel tube recycled concrete column (1) through an outer side fillet weld (10) of the rectangular bottom plate (9) and an inner side fillet weld (11) of the middle open hole; the H-shaped steel beam (2) is connected with the pi-shaped connecting piece (3) through a 30mm long high-strength bolt (5): the upper flange of the H-shaped steel beam (2) is connected with the upper limb (7) of the pi-shaped connecting piece, and the lower flange of the H-shaped steel beam (2) is connected with the lower limb (8) of the pi-shaped connecting piece; the floor shear studs (6) are uniformly welded on the top surface of the upper flange of the H-shaped steel beam (2) at equal intervals. One end of the web connecting plate (4) penetrates through a rectangular hole in the center of the rectangular bottom plate (9) to be welded with the light square steel tube recycled concrete column (1) through double-side right-angle fillet welds, and the other end of the web connecting plate is connected with the H-shaped steel beam (2) through a 30mm long high-strength bolt (5). The upper layer steel support (12) is connected with the pi-shaped connecting piece upper limb (7) through a connecting plate with a bolt hole at the lower part, and the connecting plate is connected with the pi-shaped connecting piece upper limb (7) through a 30mm long high-strength bolt (5) and a 70mm through high-strength bolt (14). The lower layer steel support (13) is connected with the lower limb (8) of the pi-shaped connecting piece through a connecting plate with a bolt hole at the lower part of the lower layer steel support and a high-strength bolt (5) with the length of 30 mm; one end of the bench steel bar (15) is fixed at the web position of the upper limb (7) of the pi-shaped connecting piece through a 70mm through high-strength bolt (14), and the other end extends into the prefabricated recycled concrete floor slab (17) to be bound with the floor slab steel bar (18). The prefabricated recycled concrete floor slab (17) is assembled with the H-shaped steel beam (2) through the reserved holes of the shear bolts and the reserved holes of the grouting material supporting plates (16), and the grouting material supporting plates (16) are pre-buried in the prefabricated recycled concrete floor slab (17) in advance.
The square steel tube in the light square steel tube recycled concrete column (1) adopts a seamless steel tube formed by one-time hot rolling, and the cross section of the square steel tube is square. The outer diameter of the steel pipe is 100 mm-150 mm, the wall thickness is 4 mm-8 mm, the recycled concrete is filled in, and the particle size of the recycled coarse aggregate is 5 mm-20 mm. The light square steel tube recycled concrete column (1) has the following advantages: the square steel pipe has a constraint function on the internally filled recycled concrete, so that the ductility of the concrete is enhanced while the bearing capacity of the recycled concrete is improved; the buckling of the steel pipe is limited by the internally filled recycled concrete, so that the instability and damage of the steel pipe can be effectively avoided. In actual engineering, the steel tube concrete column has the advantages of high rigidity, high bearing capacity, good fire resistance and corrosion resistance and the like.
The H-shaped steel beams (2) are main bearing members in the light steel frame structure, and bear the loads of walls and floors and transmit the loads to the columns. The hot rolled H-beam is used in the light steel frame. In order to avoid local buckling of the end part of the H-shaped steel beam (2) due to local stress concentration, stiffening ribs with the thickness not smaller than the web thickness of the H-shaped steel beam (2) are arranged on the outer sides of the pi-shaped connecting piece upper limbs (7) and the pi-shaped connecting piece lower limbs (8) of the pi-shaped connecting piece (3) so as to improve local rigidity. Because pi-shaped connecting piece upper limbs (7) and pi-shaped connecting piece lower limbs (8) need to be welded with the rectangular bottom plate (9), the welding seam position is provided with bulges, and the end parts of the upper flange and the lower flange of the H-shaped steel beam (2) need to be respectively polished with 5mm triangular notches before assembly, so that the accurate alignment of each bolt hole is ensured. And shearing studs are uniformly arranged on the top surface of the H-shaped steel beam (2), so that the H-shaped steel beam is ready for installation of the assembled floor.
The pi-shaped connecting piece (3) is a key component of a light steel frame and a light steel truss beam column node, and consists of a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8) and a rectangular bottom plate (9) with a central opening.
The web connecting plate (4) is a rectangular steel plate, the length of the rectangular steel plate is the same as the lengths of the upper limbs (7) and the lower limbs (8) of the pi-shaped connecting piece, the width of the rectangular steel plate is 0.8 times of the height of the rectangular holes of the rectangular bottom plate (9) with the center holes, and the thickness of the rectangular steel plate is 1.0-1.2 times of the thickness of the web of the H-shaped steel beam (2). One side of the web connecting plate (4) is vertically welded on the column wall of the light square steel tube recycled concrete column (1) through vertical corner welding seams at two sides and rectangular holes of a rectangular bottom plate (9) with a hole in the center. The web connecting plate (4) is connected with the web of the H-shaped steel beam (2) through high-strength bolts to form a second anti-seismic line of the node. Experiments prove that the web connecting plate (4) can still provide reliable bending and shearing bearing capacity for the joints after the pi-shaped connecting piece (3) fails under the action of an earthquake, so that the continuous collapse of the light steel frame caused by the failure of beam-column joints can be effectively prevented. The width of the web connecting plate (4) is smaller than the height of the rectangular holes of the rectangular bottom plate (9), so that the inner side fillet weld (11) is avoided to be welded on the column wall of the light square steel tube recycled concrete column (1). The axis of the web connecting plate (4) deviates from the weak axis of the H-shaped steel beam (2) by 0.5 times the sum of the thickness of the web connecting plate (4) and the thickness of the web of the H-shaped steel beam (2). The axis can be coincident with the light square steel tube recycled concrete column (1) when the H-shaped steel beam (2) is installed. The quality control grade of the welding seam is a primary grade or a secondary grade.
The 30mm long high-strength bolt (5) is an important component for beam-column joint connection, the material of the bolt is high-strength alloy steel or other high-quality steel, and two strength grades of 8.8 and 10.9 are adopted in the fabricated light steel house. The length of the nut is generally 10-20 mm. In order to facilitate the installation of high-strength bolts at joints, nuts can be welded at bolt holes of an upper limb (7) of a pi-shaped connecting piece and a lower limb (8) of the pi-shaped connecting piece, the bolts are assembled between the upper flange and the lower flange of an H-shaped steel beam (2) by using torque wrenches, and the same torque is set for each bolt.
The floor shear stud (6) is an important component for reinforcing the H-shaped steel beam (2) and the precast recycled concrete floor slab (17) and can serve as a floor shear key. The length of the beam is about 40mm, the diameter of the beam is 8-10 mm, one or two beams are arranged along the top surface of the upper flange of the beam, the horizontal distance is 80-150 mm, and the beam can be integrally cast with a concrete floor slab during construction of the floor slab or can be cast at a post-cast strip of an assembled floor slab.
The upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are short I-shaped steel beams which are made of two materials and have the same size, the external extension length of the short I-shaped steel beams is 1.0-1.5 times of the beam height of the H-shaped steel beam (2), the beam height is 0.5-1.0 times of the beam height of the H-shaped steel beam (2), the thicknesses of the upper flange, the lower flange and the web are 0.8-1.0 times of the flange thickness of the H-shaped steel beam (2), and the flange width is the same as the flange width of the H-shaped steel beam (2). The upper limbs (7) of the pi-shaped connecting pieces and the lower limbs (8) of the pi-shaped connecting pieces are vertically welded on the rectangular bottom plate (9) with the center holes through fillet welds, the upper limbs (7) of the pi-shaped connecting pieces and the lower limbs (8) of the pi-shaped connecting pieces are symmetrically arranged about the centroid of the rectangular bottom plate (9) with the center holes, and the centroid distances between the bottoms of the lower flanges of the upper I-shaped steel cantilever short beams and the tops of the upper flanges of the lower I-shaped steel cantilever short beams and the rectangular bottom plate (9) with the center holes are respectively 0.55 times of the height length of the H-shaped steel beams (2). Therefore, a certain gap can be reserved between the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece, and the H-shaped steel beam (2) can be assembled between the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece smoothly. The pi-shaped connecting piece (3) is connected with the side surface of the light square steel tube recycled concrete column (1) through an outer side fillet weld (10) and an inner side fillet weld (11) in a bonding manner, and the quality control grade of the welding seam is one grade or two grades.
The rectangular bottom plate (9) is a rectangular steel plate with a hole in the center. The material strength is the same as that of the steel used for the light square steel pipe recycled concrete column (1), and Q345 steel can be adopted in the light steel residential building. The height of the welding fixture is 300mm, and the welding fixture meets the size requirements of right angle fillet welds of the welding fixture and the upper limbs (7) and the lower limbs (8) of the pi-shaped connecting pieces. The width of the welding seam is 100mm, namely the welding seam is as wide as the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece, and the welding seam meets the size requirement of the outer side fillet weld (10). The rectangular holes in the middle of the rectangular bottom plate (9) are 60mm wide and 140mm high, and meet the size requirement of the inner side fillet weld (11). The rectangular bottom plate (9) mainly plays a role in connection transition between the light square steel tube recycled concrete column (1) and the pi-shaped connecting piece (3), and locally strengthens the thickness of the steel tube wall of the light square steel tube recycled concrete column (1) and protects the steel tube column wall at the position from corrosion.
The outer side fillet weld (10) and the inner side fillet weld (11) are right-angle fillet welds between the rectangular bottom plate (9) and the light square steel tube recycled concrete column (1). The height of the welding leg is 8mm, and a primary and secondary welding seam is adopted. The two welding seams transmit bending moment, axial force and shearing force transmitted by the pi-shaped connecting piece (3) to the light square steel tube recycled concrete column (1) through the rectangular bottom plate (9), and the effect of transmitting load is mainly achieved.
The upper steel support (12) and the lower steel support (13) are hot rolled H-shaped steel and are arranged between two adjacent light square steel tube recycled concrete columns (1) at an angle of 60-45 degrees. The width of the flange of the upper layer steel support (12) is equal to that of the upper limb (7) of the pi-shaped connecting piece, the width of the flange of the lower layer steel support (13) is equal to that of the lower limb (8) of the pi-shaped connecting piece, and the height of the web is generally 60-100 mm. Q345 steel is adopted. The lower end of the connecting piece is connected with the upper flange of the pi-shaped connecting piece upper limb (7) through a high-strength bolt by a steel plate with a bolt hole. The steel support is welded with the steel plate at the lower end of the steel support. The upper layer steel support (12) and the lower layer steel support (13) mainly play a role in improving the side rigidity and bearing capacity of the frame and improving the energy consumption capacity of the frame in the earthquake process.
The 70mm through high-strength bolt (14) is S8.8S or an S10.3-level high-strength bolt. The upper end of the steel beam is positioned on the upper surface of a node plate at the bottom of the upper steel support (12), and the lower end of the steel beam is positioned on the lower surface of the upper flange of the H-shaped steel beam (2). The 70mm through high-strength bolt (14) is connected with a bottom gusset plate of the upper steel support (12), an upper limb (7) of the pi-shaped connecting piece and an upper flange of the H-shaped steel beam (2). The three are connected into a whole, and one side of the bench steel bar (15) is clamped at the web position of the upper limb (7) of the pi-shaped connecting piece, so that the bench steel bar (15) and the pi-shaped connecting piece (3) are connected.
The bench steel bar (15) is a prefabricated molding steel bar, and is a key point of node-floor integrated design. The two-side arch-shaped steel bars are 80mm long, and the right-angle anchoring ends are 30mm long. The middle two transverse connection bars are 70mm long and have a spacing of 60mm. The two ends fix the arched steel bars with the arched steel bars in a spot welding or binding mode to form a prefabricated three-dimensional steel bar net. The bench steel bars (15) are composed of HRB335 phi 8 steel bars, the HRB335 phi 8 steel bars extend into reserved holes of the prefabricated recycled concrete floor slab (17) and are bound with exposed floor slab steel bars (18), the other ends of the HRB335 phi 8 steel bars are fixed at web positions of pi-shaped connecting piece upper limbs (7) through 70mm through high-strength bolts (14), and two bench steel bars (15) are symmetrically arranged on two sides of the web of the pi-shaped connecting piece upper limbs (7). The steel bar net is designed into a stool shape, so that the steel bar net is favorable for anchoring with floor steel bars (18) and grouting materials, and meanwhile, the anchoring end faces downwards, so that the steel bar net and the floor steel bars (18) are located at the same height to be convenient for binding.
The grouting material supporting plate (16) is a thin steel plate welded with embedded anchor bar hooks on three sides, the thickness of the grouting material supporting plate is 3mm, the size of the rectangular steel plate is 120mm, and the width of the rectangular steel plate is 110mm. Slightly larger than the grouting holes which are reserved in the prefabricated recycled concrete floor slab (17) and have the length of 100mm and the width of 100 mm. The grouting material supporting plate (16) is buried into the lower part of the reserved hole before the prefabricated recycled concrete floor slab (17) is formed, and the upper surface of the steel plate is flush with the lower surface of the floor slab and the upper surface of the lower flange of the pi-shaped connecting piece upper limb (7). The outer edge of the steel plate is matched with the edge of the lower flange of the upper limb (7) of the pi-shaped connecting piece, so that the grouting material can be ensured not to leak from the bottom after being poured.
The prefabricated recycled concrete floor (17) is a factory prefabricated reinforced concrete floor, the thickness of the factory prefabricated reinforced concrete floor is 80-100 mm, the factory prefabricated reinforced concrete floor is generally equal to the height of an upper limb (7) of a pi-shaped connecting piece, recycled concrete is adopted as concrete, and the concrete strength is C40. The single-layer or double-layer reinforcing mesh is arranged in the steel mesh according to the design requirement, and HRB335 grade phi 8 reinforcing bars are generally adopted, and the spacing between the reinforcing bars is 100mm. The prefabricated floor slab is provided with a hole for the upper limb (7) of the pi-shaped connecting piece at the joint, and the upper surface of the hole floor slab is flush with the surface of the upper flange of the upper limb (7) of the pi-shaped connecting piece. Grouting holes with the length of 100mm and the width of 100mm are reserved on two sides of a web plate of an upper limb (7) of the pi-shaped connecting piece, high-strength grouting material is poured after bench steel bars (15) are placed in the grouting holes, so that the grouting material fills the reserved holes and two sides of the web plate of the upper limb (7) of the pi-shaped connecting piece, and the purpose of joint work of the floor plate and the assembly type joint is achieved.
The floor steel bars (18) are distributed steel bars arranged in the prefabricated recycled concrete floor (17), and the distributed steel bars exposed out of the reserved holes play a role in connection with the bench steel bars (15).
The invention relates to a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column middle node and a manufacturing method, which comprises the following specific steps:
The first step: and prefabricating the light square steel tube recycled concrete column (1) in a factory, selecting square steel tubes and steel plates with corresponding sizes, cutting, polishing, perforating, pouring recycled concrete in the factory, and curing to finish the manufacturing of the light square steel tube recycled concrete column (1). As shown in fig. 5.
And a second step of: the pi-shaped connecting piece (3) and the web connecting plate (4) are processed in a factory workshop, finished hot-rolled I-shaped steel beams with corresponding sizes are firstly selected, and are cut, polished, punched and the like to manufacture pi-shaped connecting piece upper limbs (7) and pi-shaped connecting piece lower limbs (8), and hot-rolled steel plates with corresponding thicknesses are cut and holed to manufacture rectangular base plates (9) with central holes. Welding the upper limb (7) of the pi-shaped connecting piece, the lower limb (8) of the pi-shaped connecting piece and the rectangular bottom plate (9) to manufacture the pi-shaped connecting piece (3). And (3) selecting steel plates with corresponding sizes and strengths to cut and open holes to manufacture the web connecting plate (4). As shown in fig. 6.
And a third step of: the pi-shaped connecting piece (3) and the web connecting plate (4) are welded to the corresponding positions of the light square steel tube recycled concrete column (1) in a factory workshop. Firstly, the pi-shaped connecting piece (3) is welded to the light square steel pipe recycled concrete column (1), and the pi-shaped connecting piece (3) is connected with the side face of the light square steel pipe recycled concrete column (1) through an outer side fillet weld (10) and an inner side fillet weld (11) in a bonding manner, so that the pi-shaped connecting piece (3) is connected with the square steel pipe column through two circles of rectangular full-welded fillet welds, the length of the welding line is fully ensured, and the shearing bearing capacity and the bending bearing capacity of the welding line at the joint are fully met. And then the web connecting plate (4) is welded to the square steel pipe column through the central hole of the rectangular bottom plate (9). Nuts are welded to the bolt hole positions of the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece for installing bolts. As shown in fig. 7.
Fourth step: and a stiffening rib is arranged and welded at the web position at the end part of the H-shaped steel beam (2), and the thickness of the stiffening rib is not less than that of the web of the H-shaped steel beam (2). And processing the upper flange and the lower flange of the H-shaped steel beam (2) and the bolt holes of the web plate according to the design positions. And finally, welding a stud on the top surface of the H-shaped steel beam (2). As shown in fig. 8.
Fifth step: and (3) processing an upper steel support (12) and a lower steel support (13) in a factory, selecting hot rolled H-shaped steel meeting the requirement of the section size, and polishing and cutting the H-shaped steel into corresponding sizes. Selecting a steel plate, and processing and manufacturing the steel support bottom gusset plate through cutting, polishing, perforating and other working procedures. The machined steel support is welded to the bottom gusset plate. And finishing the prefabricated steel support. As shown in fig. 9.
Sixth step: and manufacturing a grouting material supporting plate (16) and a prefabricated recycled concrete floor slab (17), cutting a finished steel plate into corresponding sizes by a factory, processing a reinforcing steel bar hook for anchoring on the grouting material supporting plate (16) through cutting, bending and other procedures, and spot-welding the reinforcing steel bar hook onto the steel plate to finish the grouting material supporting plate. Manufacturing and binding floor steel bars, supporting a floor template, placing a grouting material supporting plate at the position of the hole, pouring floor recycled concrete, and curing and molding. As shown in fig. 10.
Seventh step: a light square steel tube recycled concrete column (1) with pi-shaped connecting pieces (3) and web connecting plates (4) is installed on a construction site. Triangular notches with the length of about 5mm are cut up and down at the end parts of the H-shaped steel beams (2), the H-shaped steel beams (2) slide into the space between the pi-shaped connecting pieces (3) of the square steel pipe columns at the two sides, bolt holes on the pi-shaped connecting pieces (3) and the web connecting plates (4) are aligned with the bolt holes of the H-shaped steel beams (2), and the H-shaped steel beams are screwed and fixed by high-strength bolts. As shown in fig. 11.
Eighth step: and installing the prefabricated upper layer steel support (12) on the corresponding position of the upper limb (7) of the pi-shaped connecting piece through a high-strength bolt. And installing the prefabricated lower steel support (13) on the corresponding position of the lower limb (8) of the pi-shaped connecting piece through a high-strength bolt. As shown in fig. 12.
Ninth step: and installing the prefabricated recycled concrete floor slab to the corresponding position. As shown in fig. 13.
Tenth step: the bench steel bars (15) are placed at the corresponding positions of the web plates of the upper limbs (7) of the pi-shaped connecting pieces, and 70mm through high-strength bolts (14) are screwed down to fix the bench steel bars (15) at the web plates of the upper limbs (7) of the pi-shaped connecting pieces. And binding the bench steel bars (15) to the floor steel bars (18). As shown in fig. 14.
Eleventh step: and pouring high-strength grouting materials at the positions of the floor shear-resistant studs (6), the pi-shaped connecting piece upper limbs (7), the bench steel bars (15) and the grouting material supporting plates (16), and carrying out subsequent construction after curing is completed. As shown in fig. 15.
Compared with the prior art, the invention relates to a concrete filled steel tubular column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column middle node and a manufacturing method, and has the following advantages:
1. The invention creatively adopts the structure of the pi-shaped connecting piece (3) to carry out the assembly connection between beams and columns: the pi-shaped connecting piece (3) increases the height of the beam column node domain and improves the shear bearing capacity of the node. Meanwhile, the rectangular bottom plate (8) with the center provided with the hole is welded on the light square steel tube recycled concrete column (1) in a pasting mode, so that column wall steel at the joint is not directly exposed in the air, and the corrosion resistance of the joint is improved. The whole node has stronger bending and shearing bearing capacity.
2. The invention creatively assembles the node connection structure and the steel support structure: the upper flange bolt holes of the upper limbs (7) of the pi-shaped connecting pieces (3) are connected with the bottom connecting plates of the upper steel supports (12) by bolts. The steel support can be assembled at the frame assembly stage by the structural form, and the steel support can be supported and installed without adding other parts at the later stage. The construction steps are greatly simplified, the cost is saved, and the construction efficiency is improved.
3. The invention creatively carries out integrated design on the connection part of the assembled floor slab and the node through the bench steel bar: the prefabricated recycled concrete floor (17) is provided with holes at the connecting parts of the prefabricated recycled concrete floor and the pi-shaped connecting piece upper limbs (7), floor steel bars (18) are exposed inside the prefabricated recycled concrete floor, and the floor steel bars (18) and the bench steel bars (15) are bound. The bench steel bar (15) is fixed with the pi-shaped connecting piece upper limb (7) through a 70mm through high-strength bolt (14). And finally pouring rigid grouting material at the starting position to form the prefabricated floor slab-bench steel bar-pi-shaped connecting piece connecting structure. The structure ensures that the precast floor slabs are reliably connected with the node areas, and the bending resistance, the compression resistance and the stability of the pi-shaped connecting piece are greatly enhanced after the steel pipe grouting material is poured into the pi-shaped connecting piece. Further ensuring the reliability of the connection structure of the steel support and the pi-shaped node.
4. The node structure is simple in design, and flexible in arrangement in the assembled light steel frame and the light steel truss structure. In the existing node structure, no matter the outer annular plate type or the inner partition plate type beam column node is adopted, the side columns, the corner columns and the middle columns are all integrally designed, so that a large amount of steel is consumed, and the exposed design problem of the beam column node can be caused. The node structure related by the invention only needs to be arranged on one side of the beam column connection, and only needs to be provided with the pi-shaped connecting piece and the web connecting plate on one side with the beam, so that the flexibility of node arrangement is greatly improved, and the loss of steel and bolts is reduced. Meanwhile, the pi-shaped connecting piece is beneficial to construction and installation of the assembled wallboard and the floor slab. The node with the triangular rib plate, which is commonly adopted at present, improves the rigidity and the earthquake resistance of the node, but the installation of the assembled wallboard and the floor at the node of the triangular rib plate is more complex, and the processing of wallboard, local corner cutting of the floor and the like is not avoided. The pi-shaped connecting piece designed in the invention has more regular structural form, the heights of the I-steel cantilever short beams are smaller than or close to the thickness of the floor slab, shear keys or pull connection ribs can be arranged at the web plate of the I-steel cantilever short beams to be poured with the floor slab into a whole, and the I-steel cantilever short beams can be hidden in the heat preservation of an assembled wall or an outer wall, so that the defects of head beam and exposed columns of an assembled steel structure house are well overcome.
5. The stress is clear, and two anti-seismic defense lines are provided. The node connection structure has simple design and high reliability. The H-shaped steel beam transmits building load to beam column joints, axial force, shearing force and bending moment of the H-shaped steel beam are transmitted to the pi-shaped connecting piece and the web connecting plate through bolts, and finally acting force transmission between the H-shaped steel beam and the steel pipe column is realized through welding seams of the rectangular bottom plate and the web connecting plate. Therefore, the node design under different load actions can be completed by controlling the length of the welding seam and the thickness of the steel, and the design reliability is more definite. Under the action of earthquake reciprocating load, the pi-shaped connecting piece is used as a first defense line to dissipate most of earthquake energy, and after the pi-shaped connecting piece fails, the web connecting plate can still bear the action of shearing force and bending moment, and the whole node can still continue to work. The method has positive significance for continuous collapse resistance and post-earthquake repair under the earthquake action of the assembled structure.
6. High assembly degree and high industrialization level. The square steel tube recycled concrete column, the pi-shaped connecting piece, the web connecting plate, the H-shaped steel beam and the like can be prefabricated in engineering and assembled in construction sites. The engineering large-scale production has high precision, strict quality control and resource saving. The welding and wet operation workload of the construction site is reduced, standard components with uniform standards and different specifications can be produced for different beam-column sections to assemble, and the construction site is favorable for realizing residential industrialization.
7. Energy saving, environmental protection and convenient transportation. The prefabricated connecting piece has less steel consumption, adopts environment-friendly and energy-saving materials such as recycled concrete and the like, adopts hot rolled section steel for the node assembly, has easily obtained materials and can basically realize no waste. The node construction method provided by the invention can be used for placing the procedures which are easy to cause noise pollution and light pollution in factories, so that the construction quality is ensured, and meanwhile, the environment is protected.
Drawings
FIG. 1 is a node construction exploded view.
Fig. 2 is a top view of the node as a whole.
Fig. 3 is an overall isometric view of a node.
Fig. 4 is a bottom view of the node as a whole.
FIG. 5 step 1-recycled steel tube concrete column is made.
FIG. 6 step 2-manufacturing a pi-shaped connector and web connection plate.
Fig. 7 step 3-welding pi connectors.
Fig. 8, step 4-manufacturing the i-beam bottom beam.
Fig. 9 step 5-making a steel support.
Fig. 10 step 6-prefabricated recycled concrete floor slab is made.
FIG. 11 step 7-assembling the beam column.
Fig. 12 step 8-assembly of the steel support.
Fig. 13 step 9-assembled floor.
Fig. 14, step 10, binding and fixing the bench reinforcement.
Fig. 15 step 11-casting grouting material.
Detailed Description
The invention will be further described with reference to specific examples.
As shown in fig. 3, the middle joint of the steel tube concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column comprises a light square steel tube recycled concrete column (1), an H-shaped steel beam (2), a pi-shaped connecting piece (3), a web connecting plate (4), a 30mm long high-strength bolt (5), a floor shearing-resistant bolt (6), a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8), a rectangular bottom plate (9), an outer side fillet weld (10), an inner side fillet weld (11), an upper steel support (12), a 70mm through high-strength bolt (14), a bench steel bar (15), a grouting material supporting plate (16), a prefabricated recycled concrete floor slab (17) and a floor steel bar (18).
The bearing capacity required by the other side steel tube recycled concrete column can be calculated according to the building load size through concrete structure design specification and steel tube concrete design specification, and the other side steel tube recycled concrete column is adjusted by adjusting the outer diameter, thickness, strength and the like of the steel tube.
The main parameters of the flanges and web thicknesses, the beam heights, the overhanging lengths and the like of the upper and lower I-steel overhanging short beams of the pi-shaped connecting piece are designed according to steel structure design specifications, and the length and thickness of the rectangular bottom plate, the central opening size and the like are determined.
H-beams are the primary load bearing members in the structure. The length and thickness of the web connecting plate are required to be adjusted according to the combination of the axial force, the shearing force and the bending moment of the beam end of the H-shaped steel beam and the steel structure design specification, the number of bolts required by a node domain, the length of a welding seam and the like are calculated.
And designing parameters such as floor thickness, concrete strength, diameter of the distributed reinforcing steel bars, spacing of the distributed reinforcing steel bars and the like according to the floor load. And determining the position and the size of the reserved hole according to the size of the pi-shaped connecting piece and the arrangement of the shear bolts on the beam.
And determining parameters such as the section size and the arrangement angle of the steel support according to the structural anti-seismic design correlation theory. And after the data are determined, the procedures of progressive blanking, production, construction, assembly and the like can be performed.
The node rigidity is improved due to the fact that the height of the pi-shaped connecting piece to the beam column node domain is increased. Therefore, the deformation of the beam with the I-shaped section is effectively controlled, and the defects of overlarge deflection of the beam and overlarge vibration amplitude of the lower beam excited by external vibration load are avoided.
In the node, the floor slab and the pi-shaped connecting piece are effectively connected through structures such as bench steel bars, high-strength bolts and the like, and the pi-shaped connecting piece is reinforced after grouting material is poured in the later stage. The upper limb of the pi-shaped connecting piece is simultaneously connected with the bottom beam and the steel support, the upper flange of the pi-shaped connecting piece is subjected to local pressure and shearing force transmitted by the steel support, and the lower flange of the pi-shaped connecting piece is subjected to axial force, bending moment and shearing force transmitted by the bottom beam, so that the whole upper limb is in a complex stress state. After grouting materials are poured around the web plate, the local bearing performance and the shearing bearing capacity of the grouting materials are greatly improved. Therefore, the bending rigidity of the node area is improved, and the shearing bearing capacity is improved.
According to the specification of steel structure design, the failure mode of the node is designed to be deformation failure of the beam end, the failure position of the steel beam is concentrated at the bolt hole of the beam flange under the action of earthquake, and the section of the beam flange is subjected to the process from yielding to fracture, so that the failure mode is a slower process with obvious deformation, and the failure mode has ideal ductile failure characteristics.
The main energy consumption area of the node in the design is a pi-shaped connecting piece, the flanges of the upper and lower I-steel cantilever short beams of the pi-shaped connecting piece deform under the action of reciprocating load so as to consume part of earthquake energy, the webs of the upper and lower I-steel cantilever short beams play the role of stiffening ribs to form a tension-compression bar truss system connected with the beam end, and part of earthquake energy is consumed while the deformation of the node is controlled.
The framework structure according to structural anti-seismic design standard accords with the rule of strong column and weak beam and needs to have a plurality of anti-seismic defense lines. The first anti-seismic defense line of the node is connected in a pi shape, and the web connecting plate is a second anti-seismic defense line. In the process of the successive failure of the first and second anti-seismic lines, the floor slabs in the node areas are mutually extruded, the crack between the beam end floor slab and the wall is widened and even completely cracked, the duration of the process is long, and the evacuation of people is facilitated.
The middle node and the construction method of the steel tube concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece combined side column are firm in connection, good in integrity, convenient to assemble, green and environment-friendly, and are suitable for assembling a novel node connection type of a low-light steel frame and a light steel truss residential building system beam column.
The above is an exemplary embodiment of the present invention, and the implementation of the present invention is not limited thereto.
Claims (5)
1. The utility model provides a steel core concrete column-H shaped steel girder-steel support-pi shape connecting piece combination formula side column middle part node which characterized in that: the pi-shaped connecting piece (3) is formed by welding an upper limb (7) of the pi-shaped connecting piece and a lower limb (8) of the pi-shaped connecting piece on a rectangular bottom plate (9) with a central hole through a right angle fillet weld, the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are vertically symmetrical, and the side parts of the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are connected through the rectangular bottom plate (9); the pi-shaped connecting piece (3) is connected with the side face of the light square steel tube recycled concrete column (1) through an outer side fillet weld (10) of the rectangular bottom plate (9) and an inner side fillet weld (11) of the middle open hole; the H-shaped steel beam (2) is connected with the pi-shaped connecting piece (3) through a 30mm long high-strength bolt (5): the upper flange of the H-shaped steel beam (2) is connected with the upper limb (7) of the pi-shaped connecting piece, and the lower flange of the H-shaped steel beam (2) is connected with the lower limb (8) of the pi-shaped connecting piece; the floor shear studs (6) are uniformly welded on the top surface of the upper flange of the H-shaped steel beam (2) at equal intervals; one end of the web connecting plate (4) passes through a rectangular hole in the center of the rectangular bottom plate (9) and is welded with the light square steel tube recycled concrete column (1) through double-side right angle fillet welds, and the other end of the web connecting plate is connected with the H-shaped steel beam (2) through a 30mm long high-strength bolt (5); the upper layer steel support (12) is connected with the pi-shaped connecting piece upper limb (7) through a connecting plate with a bolt hole at the lower part thereof by a 30mm long high-strength bolt (5) and a 70mm through high-strength bolt (14); the lower layer steel support (13) is connected with the lower limb (8) of the pi-shaped connecting piece through a connecting plate with a bolt hole at the lower part of the lower layer steel support and a high-strength bolt (5) with the length of 30 mm; one end of a bench steel bar (15) is fixed at the web position of an upper limb (7) of the pi-shaped connecting piece through a 70mm through high-strength bolt (14), and the other end of the bench steel bar extends into a prefabricated recycled concrete floor slab (17) to be bound with a floor slab steel bar (18); the prefabricated recycled concrete floor slab (17) is assembled with the H-shaped steel beam (2) through the reserved holes of the shear bolts and the reserved holes at the grouting material supporting plate (16), and the grouting material supporting plate (16) is pre-embedded in the prefabricated recycled concrete floor slab (17) in advance;
stiffening ribs with the thickness not less than the web thickness of the H-shaped steel beam (2) are arranged on the outer sides of the upper limbs (7) and the lower limbs (8) of the pi-shaped connecting pieces (3);
The web connecting plate (4) is a rectangular steel plate, the length of the rectangular steel plate is the same as the length of the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece, the width of the rectangular steel plate is 0.8 times of the height of a rectangular hole of the rectangular bottom plate (9) with the center hole, and the thickness of the rectangular steel plate is 1.0-1.2 times of the thickness of a web of the H-shaped steel beam (2); one side of the web connecting plate (4) is vertically welded on the light square steel tube recycled concrete column (1) through vertical corner welding seams at two sides and rectangular holes of a rectangular bottom plate (9) with a hole in the center;
The upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are short I-shaped steel beams which are made of two materials and have the same size, the external extension length of the short I-shaped steel beams is 1.0-1.5 times of the beam height of the H-shaped steel beam (2), the beam height is 0.5-1.0 times of the beam height of the H-shaped steel beam (2), the thicknesses of an upper flange, a lower flange and a web plate are 0.8-1.0 times of the flange thickness of the H-shaped steel beam (2), and the flange width is the same as the flange width of the H-shaped steel beam (2);
The upper steel support (12) and the lower steel support (13) are hot rolled H-shaped steel and are arranged between two adjacent light square steel tube recycled concrete columns (1) at an angle of 60-45 degrees; the width of the flange of the upper layer steel support (12) is equal to that of the upper limb (7) of the pi-shaped connecting piece;
The bench steel bar (15) is composed of two arched steel bars with anchoring ends at two sides and a middle transverse connecting steel bar.
2. The concrete filled steel tubular column-H-beam-steel support-pi shaped connector modular side column center node of claim 1, wherein: the square steel tube in the light square steel tube recycled concrete column (1) adopts a seamless steel tube formed by one-time hot rolling, and the cross section of the square steel tube is square.
3. The concrete filled steel tubular column-H-beam-steel support-pi shaped connector modular side column center node of claim 1, wherein: the rectangular bottom plate (9) is a rectangular steel plate with a hole in the center.
4. The concrete filled steel tubular column-H-beam-steel support-pi shaped connector modular side column center node of claim 1, wherein: the outer side fillet weld (10) and the inner side fillet weld (11) are right-angle fillet welds between the rectangular bottom plate (9) and the light square steel tube recycled concrete column (1).
5. A concrete filled steel tubular column-H-beam-steel support-pi shaped connector assembly side column center node construction using the node of claim 1, wherein: the implementation process of the method is as follows:
The first step: prefabricating a light square steel tube recycled concrete column (1) in a factory, selecting square steel tubes and steel plates with corresponding sizes, cutting, polishing, perforating, pouring recycled concrete in the factory, and curing to finish the manufacturing of the light square steel tube recycled concrete column (1);
And a second step of: the method comprises the steps of processing pi-shaped connecting pieces (3) and web connecting plates (4) in a factory workshop, firstly selecting finished hot-rolled I-shaped steel beams with corresponding sizes, cutting, polishing and punching to manufacture pi-shaped connecting piece upper limbs (7) and pi-shaped connecting piece lower limbs (8), and cutting and punching hot-rolled steel plates with corresponding thicknesses to manufacture rectangular bottom plates (9) with central holes; welding an upper limb (7) of the pi-shaped connecting piece, a lower limb (8) of the pi-shaped connecting piece and a rectangular bottom plate (9) to manufacture the pi-shaped connecting piece (3); selecting steel plates with corresponding sizes and strength for cutting and perforating to manufacture a web connecting plate (4);
And a third step of: welding the pi-shaped connecting piece (3) and the web connecting plate (4) to the corresponding positions of the light square steel tube recycled concrete column (1) in a factory workshop; firstly, welding a pi-shaped connecting piece (3) to a light square steel pipe recycled concrete column (1), wherein the pi-shaped connecting piece (3) is in surface welding connection with the side surface of the light square steel pipe recycled concrete column (1) through an outer side fillet weld (10) and an inner side fillet weld (11), so that the pi-shaped connecting piece (3) is connected with a square steel pipe column through two circles of rectangular full-welded fillet welds, the length of the welding line is fully ensured, and the shearing bearing capacity and the bending bearing capacity of the welding line at a joint are fully met; then, the web connecting plate (4) is welded to the square steel pipe column through a central hole of the rectangular bottom plate (9); welding nuts to the bolt hole positions of the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece for installing bolts;
fourth step: a stiffening rib is arranged and welded at the web position at the end part of the H-shaped steel beam (2), and the thickness of the stiffening rib is not smaller than that of the web of the H-shaped steel beam (2); machining upper and lower flanges and web bolt holes of the H-shaped steel beam (2) according to the design positions; finally, a stud is welded on the top surface of the H-shaped steel beam (2);
Fifth step: machining an upper steel support (12) and a lower steel support (13) in a factory, selecting hot rolled H-shaped steel meeting the requirement of the section size, polishing and cutting into corresponding sizes; selecting a steel plate, and processing and manufacturing a steel support bottom gusset plate through cutting, polishing and perforating procedures; welding the machined steel support to the bottom gusset plate; finishing the prefabricated steel support;
sixth step: manufacturing a grouting material supporting plate (16) and a prefabricated recycled concrete floor slab (17), cutting a finished steel plate into corresponding sizes by a factory, processing an anchoring steel bar hook on the grouting material supporting plate (16) through cutting and bending procedures, and spot-welding the steel bar hook on the steel plate to finish the grouting material supporting plate; manufacturing and binding floor steel bars, supporting a floor template, placing a grouting material supporting plate at the position of a hole, pouring floor recycled concrete, and curing and molding;
Seventh step: installing a light square steel tube recycled concrete column (1) with pi-shaped connecting pieces (3) and web connecting plates (4) on a construction site; triangular notches are cut up and down at the end parts of the H-shaped steel beams (2), the H-shaped steel beams (2) are slid between pi-shaped connecting pieces (3) of the square steel pipe columns at the two sides, bolt holes on the pi-shaped connecting pieces (3) and web connecting plates (4) are aligned with the bolt holes of the H-shaped steel beams (2), and high-strength bolts are used for tightening and fixing;
Eighth step: installing a pre-cast upper layer steel support (12) on the corresponding position of the upper limb (7) of the pi-shaped connecting piece through a high-strength bolt; the prefabricated lower layer steel support (13) is arranged on the corresponding position of the lower limb (8) of the pi-shaped connecting piece through a high-strength bolt;
ninth step: installing the prefabricated recycled concrete floor slab to a corresponding position;
Tenth step: placing the bench steel bars (15) at the corresponding positions of the web plates of the upper limbs (7) of the pi-shaped connecting pieces, and tightening 70mm through high-strength bolts (14) to fix the bench steel bars (15) at the web plates of the upper limbs (7) of the pi-shaped connecting pieces; binding the bench steel bars (15) to the floor slab steel bars (18);
Eleventh step: and pouring high-strength grouting material at the positions of the shearing-resistant studs (6) of the floor slab, the bench steel bars (15) of the pi-shaped connecting pieces (7) and the grouting material supporting plates (16), and carrying out subsequent construction after curing is completed.
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