CN213297357U

CN213297357U - Concrete column-H steel beam-steel support-pi combined center pillar middle node

Info

Publication number: CN213297357U
Application number: CN202021632587.5U
Authority: CN
Inventors: 曹万林; 潘有健; 董宏英; 杨兆源; 乔崎云; 张建伟
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-05-28
Anticipated expiration: 2030-08-07

Abstract

The utility model discloses a concrete column-H girder steel-steel shotcrete-pi combination formula center pillar middle part node, including light-duty square steel tube recycled concrete post, H shaped steel roof beam, pi shape connecting piece, web connecting plate, high strength bolt, steel shotcrete, I shape bench drawknot reinforcing bar, plate column drawknot reinforcing bar and prefabricated recycled concrete local floor. The novel assembling type node connection and reinforcement structures such as the Pi-shaped connecting piece and the I-shaped stool tie bar are creatively provided, the integral assembling difficulty of the beam-column-support-floor slab in the node area is effectively simplified, and the integrity, the bearing capacity and the deformation capacity of the node are obviously improved. Compared with the prior art, the anti-seismic safety line has the advantages of simple structure, convenience and quickness in construction, clear force transmission path and two anti-seismic safety lines. The node beam-column-support-floor slab is firm in connection, strong in integrity and excellent in seismic performance, and provides key technical support for the engineering design of the light steel composite structure of the assembly type green house.

Description

Concrete column-H steel beam-steel support-pi combined center pillar middle node

Technical Field

The utility model relates to a be suitable for steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node and way of doing, belong to structural engineering technical field.

Background

With the development of the construction industry technology, the house industrialization is the development trend of the construction industry in the future. Fabricated steel structures are a significant revolution in the manner of construction, being made up of factory-processed modules spliced together by field bolts. Compared with the traditional residential structure, the assembled steel structure residential building has the advantages of high integration degree, excellent earthquake resistance, environmental protection, energy conservation, short construction period, high product quality and the like. From the perspective of resource conservation, green development and circular economy, the fabricated steel structure house has great advantages, is an important development direction of fabricated buildings in China, and is an ideal structure system for industrialization of village house. If combined with combined structure members such as steel pipe concrete and the like, the bearing capacity of the combined structure member is greatly improved, the combined structure member has good anti-seismic performance, the economic effect is obvious, the construction is simple, and the construction period can be greatly shortened.

The square steel tube concrete column has the advantages of high bending rigidity, high bearing capacity, good corrosion resistance after the end of the steel tube is closed, regular appearance and good building applicability. Compared with the structure formed by H-shaped steel columns, the steel consumption is small, the cost is low, and the like, and compared with a column with a circular section, the connection of the square steel tube concrete column, the steel beam and the assembled wallboard is more convenient and reliable, so that the column section form is commonly used in the design of a steel frame. The assembled light steel combined frame formed by connecting the square steel tube concrete columns and the H-shaped steel beams has become a development direction of steel structure houses. If the recycled concrete is poured into the steel tube to form the square steel tube recycled concrete column, the purpose of sustainable green circulation is achieved, and the environment protection is facilitated. In addition, the square steel tube recycled concrete column has high bearing capacity, and the width of the section of the column can be controlled to be 100-150 mm. The reduction of the cross section of the column causes the reduction of the lateral stiffness of the whole structure, so that the whole stiffness of the structure needs to be improved by arranging interlayer supports. At present, no beam-column joint structure suitable for steel support assembly exists.

In a traditional steel structure system, a connecting node of a square steel pipe column and a beam mostly adopts node types such as a sleeve type node, a modularized node, an end plate node, a short beam with a cantilever and a beam through type. The force transmission paths of the nodes are complex, the stress analysis is difficult, the high requirements on designers are met, and the large-scale popularization is not suitable. Meanwhile, the traditional steel structure node has a complex structure and an irregular shape at the node part, so that some standardized assembled floor slabs and wall plates are difficult to be matched for use. The prefabricated wall board needs to be cut into corresponding spaces in advance due to the existence of structures such as stiffening ribs at joints, so that a cold bridge is easily caused, and the prefabricated wall board is not beneficial to heat preservation and energy conservation of a house. The development of the assembled light steel combined house is restricted by the series of defects.

In conclusion, the design of the light-weight fabricated square steel tube concrete column-H-shaped steel beam middle connecting node which is simple in structure, reliable in seismic performance, suitable for prefabricated wall panels and floor slabs and beneficial to fabricated steel support installation is an urgent problem to be solved in the development of the village and town light steel combined structure house system. Based on this, the utility model provides a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node and method of doing, specially adapted is low, many light steel frame and light steel truss residential building system, under the prerequisite of guaranteeing structure safe and reliable, improves the economic nature and the assembly efficiency of light steel house, provides the technical reference for house industrialization, building assembly ization.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node and way of doing so to solve light steel frame center pillar middle part beam column connected node atress unreasonable, consume the steel volume big, the complicated problem of structure. The problem of the prefabricated floor of center pillar middle part position and steel shotcrete and beam column node assembly connection structure is solved.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a steel tube concrete column-H-shaped steel beam-steel support-pi-shaped connector combined middle column middle node comprises a light square steel tube recycled concrete column (1), column plate tie bars (2), H-shaped steel beams (3), a pi-shaped connector, a web connecting plate (5), a 30mm long high-strength bolt (6), a floor anti-shear stud (7), a pi-shaped connector upper limb (8), a pi-shaped connector lower limb (9), a rectangular bottom plate (10), an upper prefabricated steel support (11), a lower prefabricated steel support (12), a 70mm through high-strength bolt (13), an I-shaped stool tie bar (14), a grouting material supporting plate (15), a prefabricated recycled concrete floor (16) and a floor reinforcing steel bar (17).

The connection and composition relations of the components of the utility model shown in fig. 1, 2, 3 and 4 are as follows: the column plate tie bars (2) are welded on the light square steel tube recycled concrete column (1) and are used for connecting a prefabricated recycled concrete floor slab (16); the pi-shaped connecting piece consists of a pi-shaped connecting piece upper limb (8), a pi-shaped connecting piece lower limb (9) and a rectangular bottom plate (10), wherein the rectangular bottom plate (10) is a steel plate with a rectangular hole in the middle, and the pi-shaped connecting piece upper limb (8) and the pi-shaped connecting piece lower limb (9) are respectively welded on the rectangular bottom plate (10) in a full welding manner, so that the pi-shaped connecting piece is formed; the light square steel tube recycled concrete column (1) is welded with the Pi-shaped connecting piece, four edges of the outer edge of the rectangular bottom plate (10) on the Pi-shaped connecting piece are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four corner welding seams at the outer edge, four edges of the inner side of the rectangular bottom plate (10) with holes are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four corner welding seams at the inner edge, and therefore the light square steel tube recycled concrete column (1) is connected with the single Pi-shaped connecting piece through eight corner welding seams at the inner side and the outer side; the web plate connecting plate (5) is welded with the steel pipe wall of the light square steel pipe recycled concrete column (1) through two right-angle fillet welds and through an opening on the inner side of the rectangular bottom plate (10); the upper flange and the lower flange of the H-shaped steel beam (3) are connected with the pi-shaped connecting piece upper limb (8) and the pi-shaped connecting piece lower limb (9) of the pi-shaped connecting piece through high-strength bolts (6) with the length of 30 mm; the web plate of the H-shaped steel beam (3) is connected with the web plate connecting plate (5) through a high-strength bolt (6) with the length of 30 mm; the upper-layer prefabricated steel support (11) is connected with the upper limb (8) of the Pi-shaped connecting piece through a high-strength bolt (6) with the length of 30mm and a through high-strength bolt (13) with the length of 70 mm; the prefabricated recycled concrete floor slab (16) is connected with the H-shaped steel beam (3) through the floor slab shear-resistant studs (7) and the high-strength grouting material; the prefabricated recycled concrete floor (16) is bound with each other through column plate tie bars (2), I-shaped stool tie bars (14) and floor slab steel bars (17) and is connected with each other through high-strength pouring grouting materials; the grouting material supporting plate (15) is pre-buried in the prefabricated recycled concrete floor slab (16); the I-shaped stool tie bars (14) are fixed at the web plate of the pi-shaped connecting piece upper limbs (8) through high-strength bolts (13) with the length of 70mm, and are bound with the floor slab reinforcing steel bars (17), and after high-strength grouting materials are poured, the pi-shaped connecting piece upper limbs (8) and the prefabricated recycled concrete floor slab (16) are integrated.

The square steel tube in the light square steel tube recycled concrete column (1) is a square hot-rolled seamless steel tube. 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 the steel pipe, the grain size of the recycled coarse aggregate is 5 mm-20 mm, and the strength of the concrete is C30-C50. The light square steel tube recycled concrete column (1) has the following advantages: the square steel tube has a restraint effect on the filling of the recycled concrete, so that the bearing capacity of the recycled concrete is improved, and the ductility of the concrete is enhanced; the buckling of the steel pipe is limited by filling the recycled concrete in the steel pipe, and 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 filled concrete, the size of the section of the column can be greatly reduced compared with that of a concrete structure, and the steel consumption of the column is further reduced compared with that of a steel structure column. The steel pipe can be as the template when concrete placement, and the construction is more convenient, save the cost. In practical engineering, the steel pipe concrete column has the advantages of high construction rigidity, high bearing capacity, good fire resistance and corrosion resistance and the like. After the recycled concrete material is used, the environment-friendly advantage is achieved.

The column plate tie bar (2) is a steel bar with a bending anchoring end. The diameter of the steel bar is 8mm, and the strength grade is HRB345 grade. The length is 80mm, and the bending length of the anchoring end is 40 mm. The steel bars are welded on the light square steel tube recycled concrete column (1), the welding positions and the steel bars in the prefabricated recycled concrete floor slab (16) are at the same height, and the distance is 50 mm. During assembly, column plate tie bars (2) and floor slab steel bars (17) are tied together, and high-strength grouting materials are poured in reserved hole positions between the prefabricated recycled concrete floor (16) and the light square steel tube recycled concrete columns (1), so that the main function is to effectively tie the light square steel tube recycled concrete columns (1) and the prefabricated recycled concrete floor (16), the integrity of joints is enhanced, and the rigidity and the energy consumption capacity of each section are improved.

The H-shaped steel beam (3) is a main bearing component 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 light steel composite structure generally adopts hot-rolled H-shaped steel beams as main beams or secondary beams. In order to avoid local buckling of the end part of the H-shaped steel beam (3) due to stress concentration of a connecting constructional column with a node, stiffening ribs with the thickness equal to that of a web plate of the H-shaped steel beam (3) are arranged on the outer sides of an upper limb (8) and a lower limb (9) of a pi-shaped connecting piece of the pi-shaped connecting piece so as to improve the rigidity of the end part. As the upper limbs (8) and the lower limbs (9) of the Pi-shaped connecting pieces need to be welded with the rectangular bottom plate (10), in order to prevent the upper flange and the lower flange of the steel beam at the welding seam from being tightly attached to the steel pipe column, 7mm triangular notches need to be respectively polished up and down at the end parts of the H-shaped steel beam (3) before assembly, and accurate alignment of bolt holes is guaranteed. The shear studs are uniformly arranged on the top surface of the H-shaped steel beam (3) and are ready for the installation of the fabricated floor slab.

The pi-shaped connecting piece is a key part of a beam-column joint of the light steel combined frame and consists of a pi-shaped connecting piece upper limb (8), a pi-shaped connecting piece lower limb (9) and a rectangular bottom plate (10) with a central hole.

The web connecting plate (5) is a rectangular steel plate, the length of the web connecting plate is the same as that of the pi-shaped connecting piece upper limb (8) and the pi-shaped connecting piece lower limb (9), the width of the web connecting plate is 80% of the height of the rectangular hole of the rectangular bottom plate (10), and the thickness of the web connecting plate is equal to that of the web of the H-shaped steel beam (3). One side of the web plate connecting plate (5) is vertically welded on the wall of the light square steel tube recycled concrete column (1) through two vertical fillet welds through a rectangular hole in the center of the rectangular bottom plate (9). The web connecting plate (5) is connected with the web of the H-shaped steel beam (3) through the 30mm long high-strength bolt (6) to form a joint anti-seismic second defense line. Tests prove that the web connecting plate (5) can still provide reliable bending resistance and shearing resistance bearing capacity for the node after the Pi-shaped connecting piece fails under the action of an earthquake, so that the failure of the beam column node caused by the damage of the Pi-shaped connecting piece to the light steel frame can be effectively prevented, and the structure can be prevented from continuously collapsing. The width of the web connecting plate (5) is smaller than the height of the rectangular hole of the rectangular bottom plate (10), so that the inner side fillet weld of the rectangular bottom plate (10) and the light square steel tube recycled concrete column (1) can be avoided. The axis of the web connecting plate (5) deviates from the center line of the web of the H-shaped steel beam (2) by 0.5 time of the sum of the thickness of the web connecting plate (5) and the thickness of the web of the H-shaped steel beam (2). The center line of the web plate can coincide with the center of the width of the section of the light square steel tube recycled concrete column (1) when the H-shaped steel beam (2) is installed. The weld quality control grade should be one grade or two grade.

The 30mm long high-strength bolt (6) is an important link for connecting beam-column joints, 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 assembled light steel house. The length of the nut is generally 10-20 mm of the nut. The connecting device mainly functions in connecting and fastening the H-shaped steel beam (3) with the Pi-shaped connecting piece and the web connecting plate (5) and connecting the upper prefabricated steel support (11) with the Pi-shaped connecting piece upper limb (8). Meanwhile, in order to facilitate the installation of the high-strength bolt at the node, the nut can be welded at the bolt hole of the upper limb (8) and the lower limb (9) of the pi-shaped connecting piece, a torque wrench is used for assembling the bolt between the upper flange and the lower flange of the H-shaped steel beam (3), and the same torque is set for each bolt.

The floor shear-resistant stud (7) is an important structure for reinforcing the connection between the H-shaped steel beam (3) and the fabricated concrete slab and can be used as a floor shear key, the length of the floor shear-resistant stud is 40mm, the diameter of the floor shear-resistant stud is 10mm, one channel is arranged along the top surface of the upper flange of the beam, and two channels are arranged at the joint section part for reinforcing. The horizontal distance is 80-150 mm, and after the prefabricated recycled concrete floor slab (16) is assembled, high-strength grouting material is poured at the reserved holes of the shear-resistant studs (7) of the floor slab, so that the connection between the H-shaped steel beam (3) and the prefabricated recycled concrete floor slab (16) is completed.

The upper limbs (8) and the lower limbs (9) of the Pi-shaped connecting pieces are short I-shaped steel beams which are made of two materials and have the same size, the external elongation is 1.0-1.5 times of the height of the H-shaped steel beam (3), the height of the beams is 0.5-1.0 times of the height of the H-shaped steel beam (3), the thicknesses of the upper flange, the lower flange and the web are 0.8-1.0 times of the thickness of the flange of the H-shaped steel beam (3), and the flange width is the same as that of the flange of the H-shaped steel beam (3). The upper limbs (8) and the lower limbs (9) of the Pi-shaped connecting pieces are vertically welded on the rectangular bottom plate (10) through fillet welds, the upper limbs (8) and the lower limbs (9) of the Pi-shaped connecting pieces are symmetrically arranged about the centroid of the rectangular bottom plate (10) with a central hole, and the centroid distances from the bottom of the lower flange of the upper I-shaped steel cantilever short beam and the top of the upper flange of the lower I-shaped steel cantilever short beam to the rectangular bottom plate (10) with the central hole are respectively 0.55 times of the beam height of the H-shaped steel beam (3). Therefore, a certain gap can be reserved between the upper limb (8) and the lower limb (9) of the pi-shaped connecting piece, and the H-shaped steel beam (3) can be smoothly assembled on the upper limb (8) and the lower limb (9) of the pi-shaped connecting piece. The Pi-shaped connecting piece is connected with the light square steel tube recycled concrete column (1) through an outer side fillet weld and an inner side fillet weld in a sticking welding mode, and the quality control grade of the weld is one grade or two grades.

The rectangular bottom plate (10) is a rectangular steel plate with a hole in the center. The strength of the material is the same as that of steel used for the light square steel tube recycled concrete column (1), and Q345 steel can be adopted in light steel residential buildings. The height of the connector is 300mm, and the size requirements of the right-angle fillet weld of the connector and the Pi-shaped connector upper limb (8) and the Pi-shaped connector lower limb (9) are met. The width of the connector is 100mm, namely the connector is as wide as the upper limbs (8) of the pi-shaped connector and the lower limbs (9) of the pi-shaped connector and meets the size requirement of the outside fillet weld. The width of a rectangular hole in the middle of the rectangular bottom plate (10) is 60mm, the height of the rectangular hole is 140mm, and the size requirement of an inner side fillet weld is met. The rectangular bottom plate (10) mainly plays a role in connection transition of the light square steel tube recycled concrete column (1) and the Pi-shaped connecting piece, the thickness of the steel tube wall of the light square steel tube recycled concrete column (1) is locally enhanced, and the steel tube column wall at the position is protected from being corroded.

The upper-layer prefabricated steel support (11) and the lower-layer prefabricated steel support (12) 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 (8) of the Pi-shaped connecting piece, and the height of the web plate is generally 60 mm-100 mm. Q345 steel is used. The lower end of the connecting rod is connected with the upper flange of the pi-shaped connecting piece upper limb (8) through a steel plate with bolt holes by a high-strength bolt (6) with the length of 30mm and a through high-strength bolt (13) with the length of 70 mm. The steel support is welded with the steel plate at the lower end of the steel support. The steel support (11) mainly plays a role in improving the lateral stiffness and the bearing capacity of the frame and improving the energy consumption capacity of the frame in the earthquake process.

The 70mm through high-strength bolt (13) is an S8.8S or S10.3 grade high-strength bolt. The upper end of the upper-layer prefabricated steel support (11) is positioned on the upper surface of the bottom gusset plate, and the lower end of the upper-layer prefabricated steel support is positioned on the lower surface of the upper flange of the H-shaped steel beam (3). The 70mm through high-strength bolt (13) is connected with a bottom gusset plate of the upper-layer prefabricated steel support (11), a pi-shaped connecting piece upper limb (8) and an upper flange of the H-shaped steel beam (3). The three parts are connected into a whole, and one side of the I-shaped stool tie bar (14) is clamped at the position of the web plate of the upper limb (8) of the pi-shaped connecting piece, so that the function of connecting the I-shaped stool tie bar (14) with the pi-shaped connecting piece is achieved.

The I-shaped bench tie bar (14) is a prefabricated three-dimensional reinforcement cage. The I-shaped stool tie bar (14) mainly comprises a transverse tie bow-shaped bar mesh and a longitudinal tie bar. The transverse tie bow-shaped reinforcing mesh consists of two bow-shaped reinforcing steel bars with anchoring ends at two sides and a middle transverse connecting reinforcing steel bar. The length of the arched reinforcing steel bars on the two sides is 80mm, and the length of the right-angle anchoring end is 30 mm. The length of the two middle transverse connecting steel bars is 70mm, and the distance between the two middle transverse connecting steel bars is 60 mm. The two ends of the steel bar are fixed with the arched steel bar in a spot welding or binding mode to form a prefabricated three-dimensional steel bar mesh. The transverse tie bow reinforcing mesh is arranged at the webs of the upper limbs (8) of the pi-shaped connectors at the two sides of the column. The longitudinal tie bars are composed of two 300mm long steel bars, and are spot welded with the arched reinforcing meshes at the two ends, so that the arched reinforcing meshes at the two sides of the column are tied together. The I-shaped stool tie bars (14) are composed of HRB335 phi 8 steel bars, the arch-shaped reinforcing mesh extends into a preformed hole of the prefabricated recycled concrete floor (16) and is bound with exposed floor steel bars (17), the other end of the arch-shaped reinforcing mesh is fixed at the position of a web plate of an upper limb (8) of the pi-shaped connecting piece through a 70mm through high-strength bolt (13), and two I-shaped stool tie bars (14) are symmetrically arranged on two sides of the web plate of the upper limb (8) of the pi-shaped connecting piece. The design of the steel bar net is a 'stool' shape, which is beneficial to anchoring between the steel bar net and the floor slab steel bar (17) and the grouting material, and meanwhile, the anchoring end faces downwards, the steel bar net can be heightened to enable the steel bar net and the floor slab steel bar (17) to be positioned at the same height for binding. The longitudinal tie bars tie the arched reinforcing mesh at two ends together and are bound with the floor slab reinforcing steel bars (17) and the column plate tie bars (2) so that the prefabricated recycled concrete floor slab (16), the Pi-shaped connecting piece and the light square steel tube recycled concrete column (1) form a unified whole, and the integrity of the node area is effectively improved.

The grouting material supporting plate (15) is a thin steel plate with three edges welded with embedded anchoring steel bar hooks, the thickness of the thin steel plate is 3mm, the size length of the rectangular steel plate is 390mm, and the width of the rectangular steel plate is 110 mm. Slightly larger than a grouting hole which is reserved on the prefabricated recycled concrete floor (16) and has the length of 370mm and the width of 100 mm. The grouting material supporting plate (15) is embedded into the lower portion of the reserved hole before the prefabricated recycled concrete floor slab (16) 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 (8). The outer edge of the steel plate is matched with the edge of the lower flange of the upper limb (8) of the Pi-shaped connecting piece, so that the bottom of the poured grouting material can be prevented from leaking.

The prefabricated recycled concrete floor (16) is a steel concrete floor prefabricated in a factory, the thickness of the prefabricated recycled concrete floor is 80-100 mm, the height of the prefabricated recycled concrete floor is equal to that of the upper limbs (8) and the lower limbs (9) of the pi-shaped connecting pieces, the concrete is recycled concrete, and the strength of the concrete is C40. According to design requirements, single-layer or double-layer reinforcing meshes are internally provided, HRB 335-grade phi 8 reinforcing steel bars are generally adopted, and the spacing between the reinforcing steel bars is 100 mm. A grouting hole with the length of 100mm and the width of 100mm is reserved for the pi-shaped connecting piece upper limb (8) at the node of the prefabricated floor slab, and the upper surface of the floor slab is flush with the surface of the upper flange of the pi-shaped connecting piece upper limb (8). After bench steel bars (14) are placed in the grouting holes, high-strength grouting material is poured, so that the reserved holes and two sides of a web plate of the pi-shaped connecting piece upper limb (7) are filled with the grouting material, and the purpose of joint work of the floor slab and the assembly type node is achieved.

The floor slab reinforcing steel bars (17) are distributed reinforcing steel bars configured in the prefabricated recycled concrete floor slab (16), and the distributed reinforcing steel bars exposed out of the reserved holes play a role in being connected with the H-shaped stool tie reinforcing steel bars (14).

The utility model relates to a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node and way of doing, its concrete way is as follows:

the first step is as follows: the method comprises the steps of prefabricating a light square steel tube recycled concrete column (1) and a column plate tie bar (2) in a factory, purchasing a square steel tube and a steel plate with corresponding sizes, welding a basic connecting plate at the bottom after cutting, polishing and perforating, pouring recycled concrete in the interior, and finishing the manufacturing of the square steel tube recycled concrete column (1) through maintenance. The manufactured column plate tie bars (2) are welded to corresponding positions on two sides of the light square steel tube recycled concrete column (1) as shown in figure 5.

The second step is that: machining a pi-shaped connecting piece and a web connecting plate (5) in a factory workshop, purchasing a finished hot-rolled I-shaped steel beam with a corresponding size, cutting, polishing, punching and the like to manufacture a pi-shaped connecting piece upper limb (8) and a pi-shaped connecting piece lower limb (9), cutting and punching hot-rolled steel plates with corresponding thicknesses to manufacture a rectangular bottom plate (10). And welding the upper limbs (8) and the lower limbs (9) of the pi-shaped connecting pieces with the rectangular bottom plate (10) to manufacture the pi-shaped connecting pieces. And (3) purchasing steel plates with corresponding sizes and strengths, cutting and perforating to manufacture the web connecting plate (5). As shown in fig. 6.

The third step: and welding the phi-shaped connecting piece and the web connecting plate (5) to corresponding positions on two sides of the light square steel tube recycled concrete column (1) in a factory workshop. Firstly, welding a pi-shaped connecting piece to the light square steel tube recycled concrete column (1), and paying attention to the fact that the pi-shaped connecting piece is connected with the side face of the light square steel tube recycled concrete column (1) in a sticking welding mode through an outer side fillet weld and an inner side fillet weld, therefore, the length of the weld is fully guaranteed as the pi-shaped connecting piece is connected with the square steel tube column through two circles of rectangular full-weld fillet welds, and the shearing resistance bearing capacity and the bending resistance bearing capacity of the weld at a node are fully met. And then the web plate connecting plate (5) is welded to the square steel pipe column through the central hole of the rectangular bottom plate (10). And welding nuts to bolt holes of the upper limbs (8) and the lower limbs (9) of the pi-shaped connecting pieces for mounting bolts. As shown in fig. 7.

The fourth step: and a stiffening rib is welded at the end part of the web plate of the H-shaped steel beam (3), and the thickness of the stiffening rib is not less than that of the web plate of the H-shaped steel beam (3). And processing bolt holes of upper and lower flanges and a web plate of the H-shaped steel beam (3) according to the designed position. Finally, the top surface of the H-shaped steel beam (3) is welded with the stud. As shown in fig. 8.

The fifth step: and (3) processing the upper prefabricated steel support (11) and the lower prefabricated steel support in a factory, purchasing hot-rolled H-shaped steel meeting the section size requirement, and polishing and cutting the hot-rolled H-shaped steel into corresponding sizes. And (3) purchasing a steel plate, and processing and manufacturing the steel support bottom gusset plate through the procedures of cutting, polishing, perforating and the like. The formed steel support is welded to the bottom gusset plate. And finishing the processing of the prefabricated steel support. As shown in fig. 9.

And a sixth step: manufacturing a grouting material supporting plate (15) and a prefabricated recycled concrete floor slab (16), purchasing a finished steel plate in a factory, cutting the steel plate into corresponding sizes, processing reinforcing steel bar hooks for anchoring on the grouting material supporting plate (15) through procedures of cutting, bending and the like, and spot-welding the reinforcing steel bar hooks on the steel plate to complete the grouting material supporting plate. And manufacturing and binding floor slab reinforcing steel bars, supporting a floor slab template, placing a grouting material supporting plate at the opening, pouring floor slab recycled concrete, and maintaining and forming. As shown in fig. 10.

The seventh step: the light square steel tube recycled concrete column (1) with the Pi-shaped connecting piece and the web connecting plate (5) is installed on a construction site, and the steel tube recycled concrete column is installed on a foundation through the foundation connecting plate. And (3) cutting a triangular notch with the length of about 5mm up and down at the end part of the H-shaped steel beam (6), sliding the H-shaped steel beam (3) between the pi-shaped connecting pieces of the square steel pipe columns on the two sides, aligning the bolt holes on the pi-shaped connecting pieces and the web connecting plate (5) with the bolt holes of the H-shaped steel beam (3), and screwing and fixing the H-shaped steel beam (3) by using high-strength bolts. As shown in fig. 11.

Eighth step: and installing the prefabricated recycled concrete floor slab to a corresponding position. And then the upper-layer prefabricated steel support (11) and the lower-layer prefabricated steel support (12) are installed on corresponding positions through high-strength bolts. As shown in fig. 12.

The ninth step: and placing the I-shaped stool tie bars (14) at corresponding positions, screwing up the 70mm through high-strength bolts (13) and fixing the I-shaped stool tie bars (14) at the web plate position of the pi-shaped connecting piece upper limb (8). And the transverse arch-shaped tie bars at the two ends of the I-shaped stool tie bar (14) are bound on the floor slab steel bar (17). And binding the longitudinal tie bars with the column plate tie bars (2) and the floor slab reinforcing steel bars (17). As shown in fig. 13.

The tenth step: and (3) pouring high-strength grouting material at the positions of the floor shear-resistant studs (7), the pi-shaped connecting piece upper limbs (8), the I-shaped stool tie bars (14), the grouting material supporting plates (15) and the like, and performing subsequent construction after maintenance is completed. As shown in fig. 14.

Compared with the prior art, the utility model relates to a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node and way of doing, have following advantage:

1. the utility model discloses this structure of creative adoption pi shape connecting piece carries out the assembly connection between roof beam column: the height of the beam column node area is increased by the aid of the n-shaped connecting pieces, and shearing bearing capacity of the node is improved. Meanwhile, the rectangular bottom plate (9) with the central hole is welded on the light square steel tube recycled concrete column (1) in an attaching mode, so that steel materials on the column wall of the node cannot be directly exposed in the air, and the corrosion resistance of the node is improved. The whole node has strong bending and shearing bearing capacity. Meanwhile, the pi-shaped connecting pieces are only required to be arranged on one side with the beam, and the pi-shaped connecting pieces at different positions on the same column are not continuous. If the pi connectors on the two sides of the center pillar are not directly connected, the node on one side fails, and the node on the other side cannot be influenced. The risk of the structure collapsing in succession is reduced.

2. The utility model discloses creative assembles nodal connection structure and steel shotcrete structure: and an upper flange of an upper limb (8) of the pi-shaped connecting piece in the pi-shaped connecting piece is provided with a bolt hole and is connected with a bottom connecting plate of an upper-layer prefabricated steel support (11) by adopting a bolt. The steel support can be assembled in the frame assembling stage through the structural form, and the support can be installed without additionally arranging other parts in the later stage. The construction steps are greatly simplified, the cost is saved, and the construction efficiency is improved.

3. The utility model discloses creative pass through the integrated design in plank post-node domain and center pillar both sides node domain with the assembled floor through stool drawknot muscle reinforcing bar, column slab drawknot muscle: the prefabricated recycled concrete floor slab (16) is provided with a hole at the connecting part of the prefabricated recycled concrete floor slab and the pi-shaped connecting piece upper limb (8), a floor slab reinforcing steel bar (17) is exposed inside the prefabricated recycled concrete floor slab, and the floor slab reinforcing steel bar (17) is bound with an I-shaped stool tie reinforcing steel bar (14). The I-shaped stool tie bar (14) is fixed with the pi-shaped connecting piece upper limb (8) through a 70mm through high-strength bolt (13). And finally, pouring high-strength grouting material at the opening part to form the prefabricated floor slab-stool-shaped tie bar-Pi-shaped connecting piece connecting structure.

Meanwhile, the bench-shaped tie bars and the longitudinal steel bars of the plate column tie bars are bound, and the floor slab and the light steel pipe concrete column are bound through the grouting material, so that the coordinated deformation capacity of the plate-column-node areas is enhanced. Meanwhile, the longitudinal steel bar structure effectively draws the pi-shaped connecting piece upper limbs (8) on the two sides of the center pillar, the integrity of the node areas on the two sides of the center pillar is improved, and the ductility of the plate pillar-node areas is improved to a certain extent.

Meanwhile, after the steel pipe grouting material is poured into the pi-shaped connecting piece, the bending resistance, the compression resistance and the stability of the connecting piece are greatly enhanced. The reliability of the connection structure of the steel support and the pi-shaped node is further ensured.

4. The utility model discloses creative realization the unit mount of center pillar position floor, in assembled traditional steel house room, because the regional structure of beam column node is comparatively complicated, hardly realize the wholeization assembly of the regional floor of center pillar beam column node, can only cut apart the floor in this region and assemble, this has greatly weakened floor wholeness and node and floor combined work's performance. The utility model discloses an in because floor and node pi shape connecting piece are the monolithic casting, can stride the center pillar assembly on the H shaped steel roof beam of both sides through reserving the hole on the floor, through the effectual node-post-board combination of stool shape tie bar and plank post tie bar as a whole. The rigidity of the node is greatly improved, and the bearing capacity of the node is improved in a complex state. Simultaneously with 2 ~ 4 floor loading capacity reduction to 1 of former center pillar node, promoted the efficiency of construction greatly.

5. The utility model discloses creatively has carried out the integrated design with center pillar middle part node structure precast floor, more is favorable to the installation of later stage assembled wallboard. Because the prefabricated wallboard of present general standard is mostly cut and strides less rectangle wallboard, and the four corners is the right angle and is many. The upper limbs of the Pi-shaped connecting pieces are poured together with the floor slab in the node, and no other irregular structures obstruct the installation of the wall slab, so that the installation of an external wall body and a heat insulation structure is more convenient, the generation of a cold bridge is avoided to a certain extent, and the heat insulation and energy conservation of a house are facilitated.

6. The node structure is simple in design, and the arrangement is flexible in an assembled light steel frame and light steel truss structure. No matter be outer annular plate formula or interior division board formula beam column node in the current node structure, all adopt integral design to side column, corner post and center pillar, not only consume a large amount of steel but also can cause the naked design problem of beam column node. And the utility model relates to a node structure only need install and connect one side at the beam column, only need set up pi connecting piece and web connecting plate in one side that has the roof beam and improved the flexibility that the node was arranged greatly and reduced the loss of steel, bolt. Meanwhile, the pi-shaped connecting piece is beneficial to construction and installation of the assembled wallboard and the floor slab. Although the rigidity and the seismic performance of the joint are improved by the joint with the triangular rib plate, the installation of the assembled wallboard and the floor slab at the joint of the triangular rib plate is complex, and the treatment such as local corner cutting of the wallboard and the floor slab is not avoided. The utility model discloses well pi shape connecting piece structural style of design is more regular, and the I-steel is encorbelmented the stub beam height and is all less than or is close to floor thickness, and the I-steel is encorbelmented stub beam web department and can set up shear key or draw and connect the muscle and pour as a whole with the floor, also can hide in assembled wall or outer wall heat preservation, better solution assembled steel structure house expose the drawback of roof beam, exposure post.

7. The atress is clear and definite, possesses two antidetonation defence lines. The utility model relates to a node connection structure design is simple and convenient, the reliability is high. The I-shaped section beam transfers building load to the beam column node, axial force, shearing force and bending moment of the I-shaped section beam are transferred to the Pi-shaped connecting piece and the web connecting plate through the bolts, and finally acting force transfer between the I-shaped section beam and the steel pipe column is achieved through welding seams of the rectangular bottom plate and the web connecting plate. Therefore, the joint design under different load effects 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, the web connecting plate can still bear the actions of shearing force and bending moment after the Pi-shaped connecting piece fails, and the whole node can still continue to work. The method has positive significance for resisting continuous collapse and repairing after earthquake under the earthquake action of the assembled structure.

8. High assembling degree and high industrialization level. The utility model relates to a square steel tube recycled concrete post, pi shape connecting piece, web connecting plate, H shaped steel roof beam etc. all can be prefabricated in the mill, and the job site is assembled. The engineering large-scale production has high precision, strict quality control and resource saving. The welding and wet operation workload of a construction site is reduced, standard parts with unified standards and different specifications can be produced for different beam-column sections for assembly, and the housing is beneficial to realizing housing industrialization.

9. Energy saving, environmental protection and convenient transportation. The utility model relates to a prefabricated connecting piece consumes the steel volume few, adopts environmental protection and energy saving materials such as recycled concrete, and the node subassembly adopts hot rolling shaped steel more, and the material is easy and can realize no waste material basically. The utility model provides a node structure construction method will cause noise pollution, light pollution's process to put in the mill easily and go on, when guaranteeing construction quality, can accomplish green.

Drawings

Fig. 1 is an exploded view of a node structure.

Fig. 2 is an overall top view of a node.

FIG. 3 is an overall isometric view of a node.

Fig. 4 is an overall bottom view of the node.

FIG. 5 step 1-manufacture of recycled concrete-filled tubular columns.

FIG. 6, step 2-fabrication of the Pi-shaped connector and web connection plate.

FIG. 7 step 3-welding of the pi connector.

FIG. 8, step 4-fabrication of I-beam bottom beam.

FIG. 9 step 5-making a steel support.

Fig. 10, step 6 — making a prefabricated recycled concrete floor.

Fig. 11 step 7-assembly of beam column.

Figure 12 step 8-assembly of floor slab and steel support.

FIG. 13, step 10-Straps of fixed bench rebar.

FIG. 14, step 11-casting grout.

Detailed Description

The following further describes the present invention with reference to specific embodiments.

A steel tube concrete column-H-shaped steel beam-steel support-pi-shaped connecting piece combined type center column middle node comprises a light square steel tube recycled concrete column (1), column plate tie bars (2), H-shaped steel beams (3), a pi-shaped connecting piece, a web connecting plate (5), a 30mm long high-strength bolt (6), a floor slab shear-resistant stud (7), a pi-shaped connecting piece upper limb (8), a pi-shaped connecting piece lower limb (9), a rectangular bottom plate (10), an upper layer prefabricated steel support (11), a 70mm through high-strength bolt (13), an I-shaped stool tie bar (14), a grouting material supporting plate (15), a prefabricated recycled concrete floor slab (16) and floor slab steel bars (17).

Load bearing capacity is the most important design parameter for structural applications. The bearing capacity of the square steel tube recycled concrete column can be determined according to building structure load specifications, building earthquake resistance design specifications and building load, the outer diameter and the wall thickness of the steel tube are preliminarily estimated according to the steel structure design specifications, the strength of recycled concrete is preliminarily selected according to the concrete design specifications, and the square steel tube recycled concrete column is adjusted by adjusting the outer diameter and the thickness of the steel tube, the strength of the recycled concrete and the like.

The H-beam design should generally meet the requirements of strength, overall stability and stiffness. The width-thickness ratio of the web plate and the flange of the H-shaped steel beam is not too large, the local stability can be ensured frequently, and the checking calculation is not needed. And determining the section size of the H-shaped steel beam according to the internal force of the H-shaped steel beam, and designing main parameters such as the thickness of flanges and webs of upper and lower flange connecting pieces of the Pi-shaped connecting piece, the beam height, the cantilever length and the like.

Stiffening ribs are arranged on the two sides of the web plate of the H-shaped steel beam on the outer sides of the upper limbs and the lower limbs of the pi-shaped connecting pieces, so that the end part of the H-shaped steel beam is prevented from locally buckling due to stress concentration of a connecting constructional column with a node, and the stability and the torsion resistance of the beam are improved.

And determining the length and the thickness of the rectangular bottom plate and the size of the central opening according to the sizes of the H-shaped steel beam and the pi-shaped connecting piece.

And adjusting the length and the thickness of the web connecting plate according to the axial force, the shearing force and the bending moment of the end of the H-shaped steel beam, and calculating the number of bolts required by the node area, the length of a welding seam and the like.

The utility model relates to a beam column node accessible above-mentioned parameter design changes control node connection rigidity, realizes the design target of rigid node or semi-rigid node.

And designing parameters such as the thickness of a floor slab, the strength of concrete, the diameter of distributed reinforcing steel bars, the distance between 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 then determining the thickness and the size of the grouting material support plate.

According to the relevant theory of structural seismic design, parameters such as the section size and the arrangement angle of the prefabricated steel support are determined.

And designing a plate column tie bar and an I-shaped stool tie bar according to the cross section width of the light steel pipe recycled concrete column and the size of the opening of the prefabricated floor slab.

After the data are determined, the procedures of blanking, production, construction, assembly and the like can be carried out.

At the normal use stage, the existence of pi shape connecting piece makes the height in beam column nodal region increase, according to this principle that rigidity and cross sectional dimension and shape are relevant, the node has great rigidity at the elasticity working phase, and whole node has stronger curved, receives to cut bearing capacity.

The longitudinal steel bars of the stool-shaped tie bars are bound with the plate column tie bars, and the floor slab and the light steel pipe concrete column are bound through the grouting material, so that the coordinated deformation capability of the plate-column-node areas is enhanced. Meanwhile, after grouting materials are poured around the upper limb web plate of the Pi-shaped connecting piece, the bending rigidity of the node area is improved, and the shearing resistance and bearing capacity are improved. Meanwhile, the longitudinal steel bar structure effectively ties the upper limbs of the pi-shaped connecting pieces on the two sides of the center pillar, so that the integrity of the node areas on the two sides of the center pillar is improved, and the ductility of the plate pillar-node areas is improved to a certain extent.

According to the design principle of 'strong column and weak beam', namely, at the node of a beam column, the actual bending bearing capacity of the column end is greater than that of the beam end, the pi-shaped connecting pieces are only arranged on one side with the beam, and the pi-shaped connecting pieces at different positions on the same column are not continuous. If the pi connectors on the two sides of the center pillar are not directly connected, the node on one side fails, and the node on the other side cannot be influenced.

According to the design principle of a 'strong node weak component', namely the actual bearing capacity of a node area is larger than the actual bearing capacity of the component, the failure mode of the node is designed to be beam end deformation failure, the failure position of a steel beam is concentrated at a beam flange bolt hole under the action of an earthquake, the section of the steel beam flange is subjected to the process from yielding to breaking, and the steel beam flange has ideal ductile failure characteristics.

Adopt a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar middle part node energy-concerving and environment-protective, transportation convenience, design are simple and convenient, the degree of assembly is high, the industrialization level is high, be applicable to low, many light steel frame and light steel truss residential building system beam column assembly a novel nodal connection form.

Finally, it should be pointed out that: although the preferred embodiments of the present invention have been described above by way of illustration, the scope of the present invention is not limited to the above description, and those skilled in the art will appreciate that any modifications and variations may fall within the scope of the present invention without departing from the spirit and scope of the present invention as taught by the present invention.

Claims

1. The concrete column-H steel beam-steel support-π combined type middle column middle node is characterized in that: the column-plate tie bars (2) are welded on the light-duty square steel tube recycled concrete column (1) for connecting the prefabricated recycled concrete The floor plate (16); the π-shaped connecting piece is composed of the upper limb (8) of the π-shaped connecting piece, the lower limb (9) of the π-shaped connecting piece and a rectangular bottom plate (10), wherein the rectangular bottom plate (10) is a steel plate with a rectangular hole in the middle, The upper limb (8) of the π-shaped connecting piece and the lower limb (9) of the π-shaped connecting piece are respectively fully welded on the rectangular bottom plate (10) to form the π-shaped connecting piece; Welding, using the four sides of the outer edge of the rectangular bottom plate (10) on the π-shaped connector to weld the steel pipe wall of the light-weight square steel pipe recycled concrete column (1) to form four fillet welds on the outer edge, and four fillet welds on the inner side of the rectangular bottom plate (10) The edge is welded with the recycled concrete column of light square steel tube (1) to form four fillet welds on the inner edge, and the recycled concrete column of light square steel tube (1) is connected with a single π-shaped connector through a total of eight fillet welds on the inside and the outside; The connecting plate (5) is welded to the steel pipe wall of the light-weight square steel pipe recycled concrete column (1) through the inner opening of the rectangular base plate (10) through two right-angle fillet welds; the upper and lower flanges of the H-shaped steel beam (3) are connected with the π shape The upper limb (8) and the lower limb (9) of the π-shaped connecting piece are connected by 30mm long high-strength bolts (6); High-strength bolts (6) are connected; the upper prefabricated steel support (11) is connected to the upper limb (8) of the π-shaped connector through 30mm long high-strength bolts (6) and 70mm through-high-strength bolts (13); the prefabricated recycled concrete floor slab (16) is connected by The floor slab shear studs (7) and the high-strength grouting material are connected with the H-shaped steel beams (3); the prefabricated recycled concrete floor slabs (16) are connected by the column-slab tie bars (2), the I-shaped bench tie bars (14), and the floor slabs. The reinforcing bars (17) are bound to each other and finally connected by high-strength pouring grouting material; the grouting material supporting plate (15) is pre-buried in the prefabricated recycled concrete floor slab (16); It is fixed at the web of the upper limb (8) of the π-shaped connector, and is bound with the floor reinforcement bars (17).

2. The concrete column-H steel beam-steel support-π combined type middle column middle node according to claim 1 is characterized in that: the square steel pipe in the described light-weight square steel pipe recycled concrete column (1) adopts a square heat pipe. Rolled seamless steel pipes.

3. The concrete column-H steel beam-steel support-π combined middle column middle node according to claim 1, characterized in that: the column-plate tie bars (2) are steel bars with bent anchoring ends.

4. The concrete column-H steel beam-steel support-π combined type middle column middle node according to claim 1, characterized in that: the web connecting plate (5) is a rectangular steel plate, and the length is the same as that of the π-shaped connecting piece The length of the upper limb (8) and the lower limb (9) of the π-shaped connector are the same, the width is 80% of the height of the rectangular hole of the rectangular bottom plate (10), and the thickness is equal to the thickness of the web of the H-shaped steel beam (3); the web connecting plate (5) Two vertical fillet welds on one side are vertically welded to the column wall of the lightweight square steel tube recycled concrete column (1) through the rectangular hole in the center of the rectangular base plate (10); the web connecting plate (5) is passed through, 30mm long high-strength bolts (6) Connect with the web of H-beam (3).

5. The concrete column-H steel beam-steel support-π combined central column middle node according to claim 1, characterized in that: the upper limb (8) of the π-shaped connector and the lower limb (9) of the π-shaped connector It is two short I-beam beams of the same material and size, and its outreach length is 1.0 to 1.5 times the height of the H-shaped steel beam (3), and the beam height is 0.5 to 1.0 times the beam height of the H-shaped steel beam (3). , the thickness of the upper and lower flanges and the web is 0.8 to 1.0 times the thickness of the flange of the H-shaped steel beam (3), and the flange width is the same as the flange width of the H-shaped steel beam (3). The lower limb (9) of the π-shaped connecting piece is vertically welded to the rectangular bottom plate (10) through the fillet weld, and the upper limb (8) of the π-shaped connecting piece and the lower limb (9) of the π-shaped connecting piece are shaped like a rectangular bottom plate (10) with respect to the central opening. The center is symmetrically arranged, and the centroid distances from the bottom of the lower flange of the upper I-beam cantilever short beam and the top of the upper flange of the lower I-beam cantilever short beam to the rectangular bottom plate (10) with the central hole are respectively the H-beam (3) 0.55 times the beam height.

6. The concrete column-H steel beam-steel support-π combined central column middle node according to claim 1, wherein the rectangular bottom plate (10) is a rectangular steel plate with a central hole.

7. The concrete column-H steel beam-steel support-π combined type middle column middle node according to claim 1, characterized in that: the upper prefabricated steel support (11) and the lower prefabricated steel support (12) are thermal The rolled H-beam is arranged between two adjacent lightweight square steel tube recycled concrete columns (1) at an angle of 60° to 45°; the flange width is equal to the upper limb (8) of the π-shaped connecting piece.

8. The concrete column-H steel beam-steel support-π combined type central column middle node according to claim 1, wherein the I-shaped bench tie reinforcement (14) is a prefabricated three-dimensional reinforcement cage ; The I-shaped bench tie reinforcement bar (14) is composed of two parts: a transverse tie bow-shaped steel bar mesh and a longitudinal tie bar; The ends are fixed with the arched steel bars by spot welding or binding to form a prefabricated three-dimensional steel mesh.

9. The concrete column-H steel beam-steel support-π combined type middle column middle node according to claim 1 is characterized in that: the grouting material support plate (15) is welded with pre-embedded anchoring steel bar hooks on three sides. sheet steel;

The prefabricated recycled concrete floor slab (16) is a factory prefabricated reinforced concrete floor slab;

The floor reinforcement bars (17) are distributed reinforcement bars arranged in the prefabricated recycled concrete floor slabs (16).