CN111962950B - Steel pipe concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece combined corner column middle node and manufacturing method - Google Patents
Steel pipe concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece combined corner column middle node and manufacturing method Download PDFInfo
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- CN111962950B CN111962950B CN202010790609.9A CN202010790609A CN111962950B CN 111962950 B CN111962950 B CN 111962950B CN 202010790609 A CN202010790609 A CN 202010790609A CN 111962950 B CN111962950 B CN 111962950B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 364
- 239000010959 steel Substances 0.000 title claims abstract description 364
- 239000004567 concrete Substances 0.000 title claims abstract description 136
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000013461 design Methods 0.000 claims abstract description 19
- 210000001364 upper extremity Anatomy 0.000 claims description 74
- 239000000463 material Substances 0.000 claims description 59
- 238000003466 welding Methods 0.000 claims description 40
- 210000003141 lower extremity Anatomy 0.000 claims description 39
- 238000010276 construction Methods 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 4
- 238000003908 quality control method Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims 3
- 238000004080 punching Methods 0.000 claims 2
- 230000007123 defense Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 15
- 238000010008 shearing Methods 0.000 description 15
- 230000008901 benefit Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 210000001503 joint Anatomy 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000009435 building construction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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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
-
- 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
-
- 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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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
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- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined type corner column middle node and a manufacturing method thereof. The beam-column-support connecting joint is simple and convenient to construct, environment-friendly, definite in force transmission path and provided with two anti-seismic defense lines. According to the invention, the pi-shaped connecting piece increases the height of the node area, the bearing capacity of the node is improved, the pi-shaped connecting pieces on two adjacent sides of the corner post are discontinuous, and the risk of continuous collapse of the structure is reduced. And the adjacent node areas of the corner posts are tied with the floor slab by using the cross-shaped bench tie bars, so that the node integrity is enhanced. The node beam-column-support-floor slab is firm in connection, strong in integrity and excellent in anti-seismic performance, and provides a key technical support for engineering design of an assembled green house light steel combined structure.
Description
Technical Field
The invention relates to a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined corner column middle node and a manufacturing method thereof, and belongs to the technical field of structural engineering.
Background
Along with the continuous promotion of national economy, the urban process of China is accelerated, the scale of the building engineering is also continuously enlarged, the traditional building structure form cannot meet the actual requirements of people on the building, so that the assembled building structure is generated, and great contribution is made to the development of the current building industry. Compared with the traditional building, the assembly type structure building has the advantages of high construction speed, high efficiency, short engineering construction period, good overall quality of the building, low cost, contribution to winter construction and good environmental protection performance. Meanwhile, along with the proposal of environmental protection policies such as energy conservation and emission reduction, sustainable development and the like of urban construction, prefabricated part design standardization, production industrialization, transportation fluidization and installation specialization are realized in the fabricated building construction, so that the construction production efficiency is improved, meanwhile, the generation of building construction waste is reduced, the national sustainable development strategy is met, and the method has a wide development prospect.
In the construction process of the assembled building, the steel structure construction has the advantages of high construction speed, less pollution, relatively high economic benefit, capability of reducing the dead weight of the building, and simultaneously increasing the anti-seismic performance of the building, and the like, so that the steel structure construction is widely applied in the building industry. In recent years, china actively advances the development of assembled steel structure house buildings, greatly improves the living environment of villages and towns, improves the house quality, saves energy, protects the environment, shortens the construction period, and more newly built houses are suitable for adopting assembled steel structure form systems. But steel structure houses suffer from the following problems in the construction process: road conditions in part of rural areas are difficult to meet the use requirements of component transportation and hoisting equipment; poor site construction conditions and low industrialization degree. The traditional welded steel structure node has low construction efficiency, large steel consumption and inflexible spatial arrangement, influences construction quality and construction period, increases construction cost, and is unfavorable for the application of the steel structure to assembled village and town houses. There is therefore a need to develop fabricated steel structural members and suitable node forms for use in village and town residential buildings.
The steel pipe concrete column is a member formed by filling concrete in a steel pipe, the strength of the concrete is improved by the interaction of the steel pipe and concrete materials in the stress process, the axial ductility is greatly improved, meanwhile, the existence of the concrete can avoid or delay the local buckling of the steel pipe, and the stress performance and the bearing capacity of the member are greatly improved by combining the steel pipe concrete column and the concrete, so that the steel pipe concrete column has the advantages of small section size, increased use space of a building and the like. The reduction of the section size of the concrete filled steel tubular column reduces the overall lateral stiffness of the building structure, so that steel supports are commonly used in the current engineering to increase the overall stiffness of the structure. The recycled concrete is prepared by reprocessing waste concrete to form recycled aggregate, is sustainable green concrete, accords with national sustainable development strategy, and is one development direction of concrete in future. Compared with the traditional steel frame structure, the combined structure system formed by the light steel structure and the steel tube recycled concrete column has the advantages of less steel consumption, low manufacturing cost and higher industrialization degree. In conclusion, the light recycled steel tube concrete column, the steel support and the H-shaped steel beam form a light steel combined frame structure.
The steel structure beam column node is a key point for forming lateral force resistance of the frame structure system, and the working state of the steel structure beam column node is directly related to the working performance of the frame structure. Based on the invention, a concrete filled steel tubular column-H-shaped steel beam-steel support-pi-shaped connecting piece combined corner column middle node and a manufacturing method are provided. The node is reasonable in form stress, simple to process, high in construction and assembly efficiency, good in stability and provided with two anti-seismic defense lines. The light steel pipe concrete column, the H-shaped steel beam, the steel support and the prefabricated recycled concrete floor slab can be integrally assembled on a construction site, and the parts can be produced in batches through factories, so that the construction speed can be improved, the building can be conveniently disassembled, the dismantled steel can be reused, and the construction method is an environment-friendly construction mode. The invention creatively realizes the integrated design of the node domain-floor slab, avoids the defect of cold bridge existing at the node position, and improves the integral energy-saving performance of the building. The invention is particularly suitable for the application of beam column connecting joints at the middle corner column of the assembled light steel composite structure.
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 corner column middle joint and a manufacturing method thereof, so as to solve the problems of unreasonable stress, large steel consumption, complex structure and the like of a light steel frame house corner column middle beam column connecting joint. The problem of the prefabricated floor of corner post bottom position and steel support and beam column node connection structure is solved.
In order to achieve the above purpose, the invention adopts the following technical scheme: the joint structure 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 shear-resistant stud (6), a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8), a rectangular bottom plate (9), an upper prefabricated steel support (10), a lower prefabricated steel support (11), a 70mm through high-strength bolt (12), a cross bench drawknot reinforcing steel bar (13), an inner grouting material supporting plate (14), an outer grouting material supporting plate (15), a prefabricated recycled concrete floor (16) and a floor reinforcing steel bar (17). As shown in fig. 1,2,3 and 4
The connection and composition relation of each component of the invention is as follows: the pi-shaped connecting piece (3) consists of a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8) and a rectangular bottom plate (9), wherein the rectangular bottom plate (9) is a steel plate with a rectangular hole in the middle, and the pi-shaped connecting piece upper limb (7) and the pi-shaped connecting piece lower limb (8) are welded on the rectangular bottom plate (9) in a full-time mode respectively, so that the pi-shaped connecting piece (3) is formed; the light square steel tube recycled concrete column (1) is welded with the pi-shaped connecting piece (3), four corner welds at the outer edge of a rectangular bottom plate (9) on the pi-shaped connecting piece (3) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four corner welds at the outer edge, and four edges perforated at the inner side of the rectangular bottom plate (9) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four corner welds at the inner edge, so that the light square steel tube recycled concrete column (1) is connected with 8 corner welds at the outer side through the inner side and the outer side; the web connecting plate (4) is welded with the steel pipe wall of the light square steel pipe recycled concrete column (1) through two right angle fillet welds through holes on the inner side of the rectangular bottom plate (9); the upper flange and the lower flange of the H-shaped steel beam (2) are connected with the pi-shaped connecting piece upper limb (7) and the pi-shaped connecting piece lower limb (8) of the pi-shaped connecting piece (3) through a high-strength bolt (5) with the length of 30 mm; the web plate of the H-shaped steel beam (2) is connected with the web plate connecting plate (4) through a 30mm long high-strength bolt (5); the upper layer prefabricated steel support (10) 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 (12); the lower layer prefabricated steel support (11) is connected with the lower limb (8) of the pi-shaped connecting piece through a 30mm long high-strength bolt (5); the prefabricated regenerated concrete floor (16) is connected with the H-shaped steel beam (2) through the floor shear studs (6) and the high-strength grouting material; the prefabricated regenerated concrete floor (16) is tied with the steel bars (13) through the cross-shaped wooden stool, and the floor steel bars (17) are mutually bound and finally connected through high-strength pouring grouting materials; the inner grouting material supporting plate (14) and the outer grouting material supporting plate (15) are pre-embedded in the precast recycled concrete floor slab (16); the cross bench tie bar (13) is fixed at the web of the pi-shaped connecting piece upper limb (7) through a 70mm through high-strength bolt (12), and is bound with the floor bar (17), and the pi-shaped connecting piece upper limb (7) on two adjacent sides of the corner post and the prefabricated recycled concrete floor slab (16) are integrated after pouring high-strength grouting material.
Square steel pipes in the light square steel pipe recycled concrete column (1) adopt square hot-rolled seamless steel pipes. The outer diameter of the steel pipe is generally 100 mm-150 mm according to design requirements. The wall thickness is 4 mm-8 mm, and the wall thickness is too thin, so that the steel pipe is easy to weld through, and the wall thickness is recommended to be more than 4 mm. The internally filled concrete is recycled concrete, the particle size of the recycled coarse aggregate is 5 mm-20 mm, and the strength of the concrete is C30-C50. The square steel pipe can be used as a concrete pouring template, so that the construction is more convenient, and the cost is saved. 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. After the recycled concrete material is used, the environment-friendly concrete material has the advantage of environmental protection.
The H-shaped steel beam (2) is a main bearing member in the light steel frame structure, and mainly bears the load of a wall body and a floor slab and transmits the load to the light square steel tube recycled concrete column (1). The light steel composite structure generally adopts a hot-rolled H-shaped steel beam as a main beam or a secondary beam. In order to avoid local buckling of the end part of the H-shaped steel beam (2) due to stress concentration of a constructional column connected with a node, stiffening ribs with the thickness equal to 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 the rigidity of the end part. Because pi-shaped connecting piece upper limbs (7) and pi-shaped connecting piece lower limbs (8) need be welded with the rectangular bottom plate (9), in order to prevent that the upper flange and the lower flange of the H-shaped steel beam at the welding seam position can not be tightly attached to the steel pipe column wall, the end part of the H-shaped steel beam (2) close to one side of the column wall needs to be respectively polished with a 7mm triangular notch up and down before assembly, and 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) and are ready for being used for installing the assembled floor slab.
The pi-shaped connecting piece (3) is a key component of a beam column node of the light steel combined frame 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 web connecting plate is the same as the length of the upper limb (7) of the pi-shaped connecting piece and the length of the lower limb (8) of the pi-shaped connecting piece, the width of the web connecting plate is 80% of the height of the rectangular hole of the rectangular bottom plate (9), and the thickness of the web connecting plate is equal to that 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 two vertical corner welding seams and a rectangular hole in the center of the rectangular bottom plate (9). The web connecting plate (4) is connected with the web of the H-shaped steel beam (2) through a 30mm long high-strength bolt (5) to form a second anti-seismic joint line. 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 structure caused by the failure of the beam column joints due to the failure of the pi-shaped connecting piece (3) of the light steel frame 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 of the rectangular bottom plate (9) and the light square steel tube recycled concrete column (1) can be avoided. The axis of the web connecting plate (4) deviates from the web center line 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) by 0.5 times. The center line of the web plate can be overlapped with the center of the section width of 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 link for beam-column node connection, the material of the bolt is high-strength alloy steel or other high-quality steel, and two strength grades of S8.8 grade and S10.9 grade are adopted in the fabricated light steel house. The length of the nut is generally 10-20 mm. The connecting structure mainly aims at connecting and fastening the H-shaped steel beam (2) with the pi-shaped connecting piece (3) and the web connecting plate (4) and connecting the upper prefabricated steel support (10) with the upper limb (7) of the pi-shaped connecting piece. Meanwhile, in order to facilitate the installation of high-strength bolts at the joint, 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 important structure for reinforcing the connection between the H-shaped steel beam (2) and the assembled recycled concrete floor slab is that the shear stud (6) of the floor slab can serve as a shear key of the floor slab, the length of the shear key is 40mm, the diameter of the shear key is 10mm, one shear stud is arranged along the top surface of the upper flange of the beam, and two shear studs are arranged at the end parts of the node for reinforcement. And pouring high-strength grouting material at reserved holes of the shear studs (6) of the prefabricated regenerated concrete floor slab (16) after the prefabricated regenerated concrete floor slab (16) is assembled, and completing the connection of the H-shaped steel beam (2) and the prefabricated regenerated concrete floor slab (16).
The upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are made of two short I-shaped steel beams with 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 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 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) 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 open hole, and the 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 centroid of the rectangular bottom plate (9) with the center open hole are respectively 0.55 times of the height of the H-shaped steel beam (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 on 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 light square steel tube recycled concrete column (1) through the external fillet weld and the internal fillet weld through the paste welding, 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 rod is 100mm, namely the welding rod is equal to the width of the upper limb (7) of the pi-shaped connecting piece and the width of the lower limb (8) of the pi-shaped connecting piece, and the welding rod meets the size requirement of the external fillet weld. 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. 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 upper prefabricated steel support (10) and the lower prefabricated steel support (11) are hot rolled H-shaped steel and are generally arranged between two adjacent light square steel tube recycled concrete columns (1) at an angle of 60-45 degrees. The width of the flange is equal to that of the upper limb (7) of the pi-shaped connecting piece, and the height of the web is generally 60 mm-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 steel plate with a bolt hole by a 30mm long high-strength bolt (5) and a 70mm through high-strength bolt (12). The steel support is welded with the steel plate at the lower end of the steel support. The steel support mainly plays 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 (12) is an S8.8 or S10.3-level high-strength bolt. The upper end of the steel support is positioned on the upper surface of a node plate at the bottom of the upper layer of prefabricated steel support (10), and the lower end of the steel support is positioned on the lower surface of the upper flange of the H-shaped steel beam (2). The 70mm through high-strength bolt (12) is connected with a bottom gusset plate of the upper layer prefabricated steel support (10), 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 cross-shaped bench drawknot steel bar (13) is clamped at the web position of the upper limb (7) of the pi-shaped connecting piece, so that the effect of connecting the cross-shaped bench drawknot steel bar (13) with the pi-shaped connecting piece (3) is achieved.
The cross-shaped bench drawknot reinforcement (13) is a prefabricated three-dimensional reinforcement cage. The cross-shaped bench drawknot steel bar (13) mainly comprises two bench-shaped drawknot steel bars which are vertically arranged. The bench-shaped tie bar is formed by welding two arched bars at two ends and two longitudinal bars in the middle. The two bench-shaped tie bars are vertically intersected, and then the longitudinal bars intersected by the two bench-shaped tie bars are welded to form a cross-shaped layout. One end of two orthogonal bench tie bars in the cross bench tie bar (13) is placed at the pi-shaped connecting piece upper limb (7) at two adjacent node positions of the corner post, and the pi-shaped connecting piece upper limb (7) at two adjacent node positions of the cross bench tie bar (13) and the corner post are fixed by a 70mm through high-strength bolt (12). The other side of the cross-shaped bench tie bar (13) is bound with the floor slab bar (17). The connecting mode is the key for forming the integral design of the node-floor slab, the tie bars (13) of the cross-shaped stool realize the fixation with the upper limbs (7) of the pi-shaped connecting pieces and the prefabricated recycled concrete floor slab (16) through the arched bars at the two sides, and the tie of the upper limbs (7) of the pi-shaped connecting pieces and the prefabricated recycled concrete floor slab (16) is realized through the longitudinal bars in the middle. Meanwhile, the special structure of the cross realizes the tie between the node areas on two adjacent sides of the pouring position and the precast floor slab. The crossed bench drawknot steel bar (13) adopts phi HRB335 grade steel bar which is the same as that of the prefabricated recycled concrete floor slab, the arched steel bar is 100mm long, two ends of the arched steel bar form 40mm long anchoring ends at 90-degree bending positions, the bending ends play a role in anchoring the crossed bench drawknot steel bar (13) in concrete, and the crossed bench drawknot steel bar (13) is lifted by 40mm to reach the same height as the distributed steel bars in the prefabricated recycled concrete floor slab (16), so that the steel bars are conveniently bound. The length of the longitudinal steel bar is 200mm. The tie bar (13) of the cross stool is a cross three-dimensional steel bar cage with the length and width of 200mm.
The inner grouting material supporting plate (14) is a thin steel plate welded with embedded anchor bar hooks on three sides, the thickness of the thin steel plate is 3mm, the size of the rectangular steel plate is 210mm, and the width of the rectangular steel plate is 210mm. Slightly larger than the grouting holes which are reserved in the prefabricated recycled concrete floor (16) and have the length of 200mm and the width of 200 mm. The inner grouting material supporting plate (14) is buried into the lower part of the reserved hole before the prefabricated recycled concrete floor (16) is formed, and the upper surface of the steel plate is flush with the lower surface of the floor 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 supporting plate (14) ensures that grouting material at the bottom of the grouting material poured into holes of the upper limb (7) of the pi-shaped connecting piece at the two sides of the corner post and the drawknot steel bar (13) of the cross-shaped stool are not leaked.
The outer grout pallet (15) is similar to the inner grout pallet (14). The grouting material is positioned at the outer sides of two adjacent nodes of the corner column, and the grouting material is mainly used for preventing grouting material from leaking when grouting material is poured into the concrete when the web plate of the upper limb (7) of the pi-shaped connecting piece is positioned at one side outside the nodes. The thickness of the outer grouting material supporting plate (15) is 3mm, the width is 70mm, and the length is 210mm. The outer side of the web plate of the upper limb (7) of the pi-shaped connecting piece of the column can be completely blocked, and grouting material is not leaked when the grouting material is poured.
The prefabricated recycled concrete floor (16) is a factory prefabricated reinforced concrete floor, the thickness of the factory prefabricated reinforced concrete floor is 80-100 mm, the heights of the factory prefabricated reinforced concrete floor are equal to those of the pi-shaped connecting piece upper limbs (7) and the pi-shaped connecting piece lower limbs (8), 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 precast floor slab is provided with grouting holes with the length of 200mm and the width of 200mm for the upper limb (7) of the pi-shaped connecting piece at the two adjacent joints of the corner post, and the upper surface of the floor slab is flush with the surface of the upper flange of the upper limb (7) of the pi-shaped connecting piece. And high-strength grouting material is poured after the cross-shaped bench tie bars (13) are placed in the grouting holes, so that the grouting material fills the reserved holes and two sides of the web plate of the pi-shaped connecting piece upper limb (7), and the aim of joint work of the floor slab and the assembly type node is fulfilled.
The floor steel bars (17) are distributed steel bars arranged in the prefabricated recycled concrete floor (16), and the distributed steel bars exposed out of the reserved holes play a role in being connected with the cross bench drawknot steel bars (13).
The invention relates to a concrete filled steel tube column-H-shaped steel beam-steel support-pi-shaped connecting piece combined corner column middle node and a manufacturing method, which comprises the following specific steps:
The first step: and (3) prefabricating the light square steel tube recycled concrete column (1) in a factory, purchasing square steel tubes and steel plates with corresponding sizes, cutting, polishing, perforating, welding a foundation connecting plate at the bottom, pouring recycled concrete in the foundation connecting plate, and curing to finish the manufacture of the square steel tube recycled concrete column (1). As shown in fig. 5.
And a second step of: pi-shaped connecting pieces (3) and web connecting plates (4) on two adjacent sides of a corner post are processed in a factory workshop, finished hot-rolled I-shaped steel beams with corresponding sizes are purchased, 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 perforated to manufacture rectangular base plates (9). 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 (5) purchasing steel plates with corresponding sizes and strengths, cutting and perforating to manufacture the web connecting plate (4). As shown in fig. 6.
And a third step of: and welding the pi-shaped connecting piece (3) and the web connecting plate (4) to corresponding positions on two adjacent sides of the light square steel tube recycled concrete column (1) in a factory workshop. Firstly, two pi-shaped connecting pieces (3) are welded on a light square steel pipe recycled concrete column (1), and the pi-shaped connecting pieces (3) are connected with the side face of the light square steel pipe recycled concrete column (1) through an outer side fillet weld and an inner side fillet weld in a welding manner, so that the pi-shaped connecting pieces (3) are connected with a square steel pipe column through two circles of rectangular full-welded fillet welds, the length of the welding seams is fully ensured, and the shearing bearing capacity and the bending bearing capacity of the welding seams at joints are fully met. And then the two web connecting plates (4) are 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 beam end of the H-shaped steel beam (2), and the thickness of the stiffening rib is not less than that of the web plate 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 the upper prefabricated steel support (10) and the lower prefabricated steel support (11) in a factory, purchasing hot rolled H-shaped steel meeting the requirement of the section size, and polishing and cutting the H-shaped steel into corresponding sizes. And purchasing 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 an inner grouting material supporting plate (14), an outer grouting material supporting plate (15) and a prefabricated recycled concrete floor (16), purchasing a finished steel plate in a factory, cutting the steel plate into corresponding sizes, processing reinforcing steel hooks for anchoring on the inner grouting material supporting plate (14) and the outer grouting material supporting plate (15) through procedures such as cutting, bending and the like, and spot-welding the reinforcing steel hooks 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 the hole, pouring floor recycled concrete, and curing and molding. As shown in fig. 10.
Seventh step: a light square steel tube recycled concrete corner post (1) with a pi-shaped connecting piece (3) and a web connecting plate (4) is installed on a construction site, and the steel tube concrete post is installed on a foundation through a foundation connecting plate. Triangular notches with the length of about 5mm are cut up and down at the end parts of the H-shaped steel beams (6), 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 recycled concrete floor slab to the corresponding position. As shown in fig. 12.
Ninth step: and installing the upper layer prefabricated steel support (10) and the lower layer prefabricated steel support (11) on corresponding positions through high-strength bolts. As shown in fig. 13.
Tenth step: the cross bench tie bar (13) is placed at the corresponding position, and the 70mm through high-strength bolt (13) is screwed to fix the cross bench tie bar (13) at the web position of the pi-shaped connecting piece upper limb (7) of the two adjacent nodes. And binding the transverse bow-shaped tie bars at the two ends of the cross-shaped bench tie bar (13) to the floor slab bar (17). Binding the longitudinal steel bars with the column plate tie bars (2) and the floor slab steel bars (17). As shown in fig. 14.
Eleventh step: and pouring high-strength grouting materials at positions such as the shear studs (6), the pi-shaped connecting piece upper limbs (7), the cross bench tie bars (13), the inner grouting material supporting plates (14) and the outer grouting material supporting plates (14), 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 corner column middle node and a manufacturing method, and has the following advantages:
1. The invention creatively proposes the use of a light square steel tube recycled concrete column in a village and town residential structure: 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. Due to the combined action of the thin-wall steel pipe and the internally filled concrete, the section size of the column can be greatly reduced compared with a concrete structure, and the steel quantity for the steel structure column is further reduced compared with that of the steel structure column.
2. 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 (9) with the center 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 air, and corrosion resistance of the joint is improved. The whole node has stronger bending and shearing bearing capacity. Meanwhile, the pi-shaped connectors only need to be arranged on one side with the beam, and the pi-shaped connectors at different positions on the same column are discontinuous. If pi-shaped connectors on two adjacent sides of the corner post are not directly connected, one side node fails, and the other side node is not affected. The risk of continuous collapse of the structure is reduced.
3. 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 prefabricated steel supports (10) 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.
4. The invention creatively uses the cross bench-shaped tie bars (12) to tie two adjacent nodes of the corner posts with the prefabricated floor slab, and combines the pi-shaped connecting piece upper limbs (7) with the cross bench-shaped tie bars (12) and the prefabricated recycled concrete floor slab (16) into a whole through grouting materials. The node-floor integrated design not only strengthens the cooperative work of the floor and the node, so that the floor in the corner post area is not easy to separate from the node under the earthquake action, but also enables the adjacent corner posts to tie the nodes, thereby greatly improving the earthquake resistance of the corner post nodes. Meanwhile, near grouting material is poured at the web position of the upper limb (7) of the pi-shaped connecting piece, so that a steel-reinforced concrete-like structure is formed, and the structure is different from any existing traditional steel structure node. The rigidity of the node is greatly increased after grouting the upper limb (7) of the pi-shaped connecting piece, and the shearing resistance of the node domain is improved. Meanwhile, the local bearing capacity and the shearing capacity of the upper limb (7) of the pi-shaped connecting piece are improved, and the connection reliability of the upper prefabricated steel support (10) and the upper limb (7) of the pi-shaped connecting piece is enhanced.
5. The stress is clear, and two anti-seismic defense lines are provided. The node connection structure has simple design and high reliability. The I-shaped section beam transmits building load to beam column joints, axial force, shearing force and bending moment of the I-shaped section beam are transmitted to the pi-shaped connecting piece and the web connecting plate through bolts, and finally acting force transmission between the I-shaped section 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-assembled floor.
Fig. 13 step 9-assembly of the steel support.
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.
The joint 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 shear-resistant stud (6), a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8), a rectangular bottom plate (9), an upper prefabricated steel support (10), a 70mm through high-strength bolt (12), a cross bench drawknot steel bar (13), an inner grouting material supporting plate (14), an outer grouting material supporting plate (15), a prefabricated recycled concrete floor (16) and a floor steel bar (17).
The building load is obtained through engineering examples, the bearing capacity of the square steel tube recycled concrete column can be obtained through calculation, and the cross-sectional area, the steel tube wall thickness and the strength of the internally filled recycled concrete of the square steel tube recycled concrete column are adjusted. Through the calculation of bending moment, shearing force and axial force of the beam end of the H-shaped steel beam, the thickness of the flange and the web of the pi-shaped connecting piece, the height and overhanging length of the steel beam, the size and the center opening size of the rectangular bottom plate and the length and thickness of the web connecting plate are designed, and meanwhile, the reasonable number of bolts and the fillet weld length under the node area can be calculated, and the thickness of the flange and the web needs to be locally thickened at the node area, so that certain plasticity is ensured, and the stability of the node area is enhanced. The beam column node can realize the conversion between the rigid node and the semi-rigid node by controlling the design change of the parameters.
Design parameters such as floor size, diameter and spacing of distributed reinforcing steel bars, strength of recycled concrete and the like are designed by consulting building design specifications and calculating 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 type and the arrangement position of the shear bolt on the beam.
And determining the slenderness ratio, the diameter-thickness ratio, the section size and the arrangement angle of the steel support according to the calculation of the side rigidity and the bearing capacity of the frame and the structural anti-seismic design theory, and performing industrial production construction, equipment and other procedures after determining the parameters.
The slab column tie bars and the cross bench-shaped tie bars are designed according to the section sizes of the light steel pipe recycled concrete column and the pi-shaped connecting piece and the opening size of the prefabricated recycled concrete floor slab.
In the normal use stage, the existence of the pi-shaped connecting piece can increase the height of the steel structure beam column node domain, so that the node has stronger bending and shearing bearing capacity, the fact that the column cannot be subjected to plastic hinge is ensured, and the light steel frame structure has good ductility under the earthquake action, thereby having better earthquake resistance. Because the upper limbs of the pi-shaped connecting pieces are connected with the bottom beams and the steel supports through bolts at the same time, the upper flanges of the pi-shaped connecting pieces are subjected to local pressure and shearing force transmitted downwards by the steel supports; the lower flange is connected with the steel support and the bottom beam, and is subjected to axial force, bending moment and shearing force transmitted downwards by the bottom beam, so that the whole is in a complex stress state, and therefore, the bending rigidity and the shearing bearing capacity of the node area are improved.
In this patent, recycled concrete floor and pi shape connecting piece pass through structures such as cross bench shape drawknot reinforcing bar and high strength bolt and are connected, make grout material fill up reserved hole and pi shape connecting piece web both sides after pouring high strength grouting material, make floor and assembled node work jointly, corner post regional floor is difficult for disengaging with the node under the seismic action, also very big promotion pi shape connecting piece web's local bearing nature and shear bearing capacity.
In the beam column joint, the pi-shaped connecting piece is connected with the web connecting plate and the square steel tube recycled concrete column through welding, and the pi-shaped connecting piece is connected with the H-shaped steel beam through bolts. When the shearing force and bending moment applied to the beam end of the steel beam are transmitted to the bolt and the welding seam, the damage forms are bolt shearing and welding seam cracking, and the two damage forms are brittle failure. Therefore, the sufficient safety reserve of the welding line and the bolt is ensured in the design stage, and the occurrence of brittle failure is avoided.
The basic principle of 'strong node weak component' should be followed in steel construction anti-seismic design, namely under the action of earthquake, when some anti-side force components enter the yield state, the node connecting these components will not be destroyed first, but the purpose of reducing the structural earthquake action is achieved by the plastic circulation energy consumption of these components, in the invention, the structure of the node of the reinforced beam column is presented, so that the H-shaped steel beam connected with the node is destroyed before the node. The damage position of the steel beam under the action of earthquake is concentrated at the bolt hole of the beam flange, and the beam flange can be firstly yielding and then broken, so that the damage is a slow and obvious deformation process, and has good ductile damage characteristics. The beam column node mainly consumes energy through the pi-shaped connecting piece under the earthquake action, the pi-shaped connecting piece consumes earthquake energy through the deformation of the flanges of the upper limb and the lower limb under the reciprocating load action, and meanwhile, the web is similar to a stiffening rib, so that the local stability is ensured, the deformation of the node is controlled, and part of earthquake energy is consumed. The node is provided with two anti-seismic defense lines, wherein the pi-shaped connecting piece is a first anti-seismic defense line, and the web connecting plate is a second anti-seismic defense line. When the horizontal earthquake action is increased, after the first earthquake-proof line fails, the second earthquake-proof line can continue to play a role in preventing the collapse and damage of the steel girder. When the pi-shaped connecting piece is broken, the floors near the joints are mutually extruded, and the cracks between the floors and the wall face are gradually widened until the floors are cracked, but the breaking process is very slow, so that valuable time is provided for safely and reasonably evacuating people. Meanwhile, the invention also accords with the design rule of 'strong column and weak beam', specifically, pi-shaped connecting pieces are only required to be arranged on one side with the beam, pi-shaped connecting pieces on two adjacent sides of the corner column are not associated, so that nodes at other positions where nodes at one side fail are not influenced, and the structure is prevented from continuously collapsing.
The combined type corner post middle node of the steel tube concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece has the advantages of simple structure, economy, practicability, high rigidity, high energy consumption capability, high installation speed, environmental protection and good anti-seismic performance, is a novel node form suitable for assembling beam column nodes of a low-layer and multi-layer light steel frame and light steel truss building residential system, and can be widely applied to assembled village and town residences.
The above is an exemplary embodiment of the present invention, and the implementation of the present invention is not limited thereto.
Claims (4)
1. The utility model provides a steel core concrete column-H shaped steel girder-steel support-pi shape connecting piece combination formula corner post middle part node which characterized in that: the pi-shaped connecting piece (3) consists of a pi-shaped connecting piece upper limb (7), a pi-shaped connecting piece lower limb (8) and a rectangular bottom plate (9), wherein the rectangular bottom plate (9) is a steel plate with a rectangular hole in the middle, and the pi-shaped connecting piece upper limb (7) and the pi-shaped connecting piece lower limb (8) are welded on the rectangular bottom plate (9) in a full-time mode respectively, so that the pi-shaped connecting piece (3) is formed; the light square steel tube recycled concrete column (1) is welded with the pi-shaped connecting piece (3), four edges of the outer edge of the rectangular bottom plate (9) on the pi-shaped connecting piece (3) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four fillet welds on the outer edge, four edges perforated on the inner side of the rectangular bottom plate (9) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four fillet welds on the inner edge, and the light square steel tube recycled concrete column (1) is connected with a single pi-shaped connecting piece (3) through eight fillet welds on the inner side and the outer side; the web connecting plate (4) is welded with the steel pipe wall of the light square steel pipe recycled concrete column (1) through two right angle fillet welds through holes on the inner side of the rectangular bottom plate (9); the upper flange and the lower flange of the H-shaped steel beam (2) are connected with the pi-shaped connecting piece upper limb (7) and the pi-shaped connecting piece lower limb (8) of the pi-shaped connecting piece (3) through a high-strength bolt (5) with the length of 30 mm; the web plate of the H-shaped steel beam (2) is connected with the web plate connecting plate (4) through a 30mm long high-strength bolt (5); the upper layer prefabricated steel support (10) 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 (12); the lower layer prefabricated steel support (11) is connected with the lower limb (8) of the pi-shaped connecting piece through a 30mm long high-strength bolt (5); the prefabricated regenerated concrete floor (16) is connected with the H-shaped steel beam (2) through the floor shear studs (6) and the high-strength grouting material; the prefabricated regenerated concrete floor (16) is tied with the steel bars (13) through the cross-shaped wooden stool, and the floor steel bars (17) are mutually bound and finally connected through high-strength pouring grouting materials; the inner grouting material supporting plate (14) and the outer grouting material supporting plate (15) are pre-embedded in the precast recycled concrete floor slab (16); the cross bench tie bars (13) are fixed at the web of the pi-shaped connecting piece upper limbs (7) through 70mm through high-strength bolts (12), are bound with the floor slab bars (17), and enable the pi-shaped connecting piece upper limbs (7) on two adjacent sides of the corner posts to form a whole with the precast recycled concrete floor slab (16) after pouring high-strength grouting materials;
the H-shaped steel beam (2) is a bearing member in a light steel frame structure, and mainly bears the load of a wall body and a floor slab and transmits the load to the light square steel tube recycled concrete column (1); the hot-rolled H-shaped steel beam is adopted as a main beam or a secondary beam in the light steel combined structure; in order to avoid local buckling of the end part of the H-shaped steel beam (2) due to stress concentration of a constructional column connected with a node, stiffening ribs with the thickness equal to 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 pieces (3) so as to improve the rigidity of the end part; the upper limbs (7) and the lower limbs (8) of the pi-shaped connecting pieces are welded with the rectangular bottom plate (9); before assembly, the end part of the H-shaped steel beam (2) close to one side of the column wall is required to be polished with triangular notches up and down;
the pi-shaped connecting piece (3) is a key component of a beam column node of the light steel combined frame 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 web connecting plate is the same as that of the upper limb (7) and the lower limb (8) of the pi-shaped connecting piece, the width of the web connecting plate is 80% of the height of the rectangular hole of the rectangular bottom plate (9), and the thickness of the web connecting plate is equal to that 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 two vertical corner welding seams and a rectangular hole in the center of the rectangular bottom plate (9);
The upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece are made of two short I-shaped steel beams with 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) 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 hole, and the 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 centroid of the rectangular bottom plate (9) with the center hole are respectively 0.55 times of the height of the H-shaped steel beams (2); so that a certain gap is 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 smoothly spliced on the upper limb (7) of the pi-shaped connecting piece and the lower limb (8) of the pi-shaped connecting piece; the pi-shaped connecting piece (3) is connected with the light square steel tube recycled concrete column (1) through the external fillet weld and the internal fillet weld through the paste welding, and the quality control grade of the welding seam is one grade or two grades;
The upper layer prefabricated steel support (10) and the lower layer prefabricated steel support (11) 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, and the width of the flanges is equal to that of the upper limbs (7) of the pi-shaped connecting pieces;
The cross-shaped bench tie bar (13) is a prefabricated three-dimensional bar cage; the cross-shaped bench tie bar (13) mainly consists of two bench-shaped tie bars which are vertically arranged; the bench-shaped tie bar is formed by welding two arched bars at two ends and two longitudinal bars in the middle; the two bench-shaped tie bars are vertically intersected, and then the longitudinal bars intersected by the two bench-shaped tie bars are welded to form a cross-shaped layout; one end of two orthogonal bench tie bars in the cross bench tie bar (13) is placed at the pi-shaped connecting piece upper limb (7) at two adjacent node positions of the corner post, and the cross bench tie bar (13) is fixed with the pi-shaped connecting piece upper limb (7) at two adjacent node positions of the corner post through a 70mm through high-strength bolt (12); the other side of the cross-shaped bench tie bar (13) is bound with the floor slab bar (17).
2. The concrete filled steel tubular column-H-shaped steel beam-steel support-pi shaped connector combination corner column middle node of claim 1, wherein: square steel pipes in the light square steel pipe recycled concrete column (1) are square hot-rolled seamless steel pipes, and the internally filled concrete is recycled concrete.
3. The concrete filled steel tubular column-H-shaped steel beam-steel support-pi shaped connector combination corner column middle node of claim 1, wherein: the floor shear stud (6) is formed by connecting the reinforced H-shaped steel beam (2) with an assembled recycled concrete floor and serves as a floor shear key.
4. A concrete filled steel tubular column-H-beam-steel support-pi shaped connector assembly corner column center node construction as defined in claim 1, wherein: the specific 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, welding a foundation connecting plate at the bottom, pouring recycled concrete in the foundation connecting plate, and curing to finish manufacturing the light square steel tube recycled concrete column (1);
And a second step of: the method comprises the steps of machining pi-shaped connecting pieces (3) and web connecting plates (4) on two adjacent sides of a corner post 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 base plates (9); 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 corresponding positions on two adjacent sides of the light square steel tube recycled concrete column (1) in a factory workshop; welding two pi-shaped connecting pieces (3) to the light square steel pipe recycled concrete column (1), and welding two web connecting plates (4) to the square steel pipe column through a central hole of a 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 beam end of the H-shaped steel beam (2), and the thickness of the stiffening rib is not less than that of a web plate of the H-shaped steel beam (2); machining bolt holes of upper flanges, lower flanges and webs 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 layer prefabricated steel support (10) and a lower layer prefabricated steel support (11) 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 an inner grouting material supporting plate (14), an outer grouting material supporting plate (15) and a prefabricated recycled concrete floor slab (16), selecting a finished steel plate to cut into corresponding sizes in a factory, processing reinforcing steel hooks for anchoring on the inner grouting material supporting plate (14) and the outer grouting material supporting plate (15) through cutting and bending procedures, and spot-welding the reinforcing steel hooks 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: a light square steel tube recycled concrete column (1) with a pi-shaped connecting piece (3) and a web connecting plate (4) is installed on a construction site, and the steel tube concrete column is installed on a foundation through a foundation connecting plate; 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 the prefabricated recycled concrete floor slab to a corresponding position;
Ninth step: installing an upper layer prefabricated steel support (10) and a lower layer prefabricated steel support (11) on corresponding positions through high-strength bolts;
tenth step: placing the cross bench tie bars (13) at corresponding positions, and tightening 70mm through high-strength bolts (12) to fix the cross bench tie bars (13) at web positions of pi-shaped connecting piece upper limbs (7) of two adjacent nodes; binding transverse bow-shaped tie bars at two ends of the tie bars (13) of the cross-shaped stool to the floor slab steel bars (17); binding longitudinal steel bars with column plate tie bars and floor slab steel bars (17);
Eleventh step: and pouring high-strength grouting materials at positions of the shear-resistant studs (6) of the floor slab, the upper limbs (7) of the pi-shaped connecting pieces, the tie bars (13) of the cross-shaped wooden stool, the inner grouting material supporting plates (14) and the outer grouting material supporting plates (14), and carrying out subsequent construction after curing.
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