CN213539881U - Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node - Google Patents

Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node Download PDF

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CN213539881U
CN213539881U CN202021631407.1U CN202021631407U CN213539881U CN 213539881 U CN213539881 U CN 213539881U CN 202021631407 U CN202021631407 U CN 202021631407U CN 213539881 U CN213539881 U CN 213539881U
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steel
shaped
plate
connecting piece
column
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曹万林
杨兆源
董宏英
潘有健
乔崎云
张建伟
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The utility model discloses a steel core concrete column H type roof beam supports pi combination formula center pillar bottom node, this node mainly comprises light-duty square steel tube recycled concrete post, H shaped steel roof beam, pi 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 floor. Compared with the prior art, the node is simple in structure, convenient and fast to construct, clear in force transmission path and provided with two anti-seismic defense lines. The utility model discloses the creative novel structures such as pi shape connecting piece, stool shape reinforcing bar and slab-column drawknot reinforcing bar that provide, board-post-node region wholeness reinforcing. Effectively improving the bending resistance, the compression resistance and the stability of the node. The reliability of the connection structure of the steel support and the pi-shaped node is further ensured. 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

Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node
Technical Field
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 bottom node and way of doing, belong to structural engineering technical field.
Background
The trend of realizing the housing industrialization development by industrialization is inevitable, and the development of housing industrialization technology is a main means for realizing the wide application of assembly type buildings and achieving the development target of urban green buildings.
The assembled steel structure has the advantages of light weight, high strength, high production efficiency, high assembly level and the like, and is an ideal structural system for rural residential industrialization. The assembled light steel residential system has high assembling efficiency, low steel consumption and low construction cost, and if combined with combined structural members such as steel pipe concrete and the like, the steel consumption and the section size of the members can be further reduced, and excellent bearing capacity and earthquake resistance can be obtained.
H-shaped steel columns are mostly adopted as load-bearing members in the traditional steel structure, but for village and small towns residences with building length-width ratios close to 1, the bending resistance of the H-shaped steel columns in the weak axis direction is poor. And the H-shaped steel column exceeds a certain slenderness ratio, and the column bottom has a destabilization risk when bearing larger bending moment and axial force. The combined member of the square steel tube concrete column not only can meet the stress principle that the anti-seismic performance of the two main shaft directions is the same, but also can greatly improve the bearing capacity under a complex stress state due to the combined action of the steel tube and the filled concrete, and improve the fire resistance and the corrosion resistance. And the cross-sectional size of the column can be further reduced, thereby saving the use amount of concrete and steel. If the recycled concrete is poured into the steel tube to form the square steel tube recycled concrete column, the purpose of green cycle sustainability is achieved, and the method is more beneficial to environmental protection. Therefore, the square steel tube recycled concrete column is suitable for the assembled light steel residential system.
The anti-seismic performance and the assembly rate of the light steel structure system depend on the reasonable stress and the assembly degree of the node structure to a certain extent. The beam-column connection node in the traditional steel structure system mostly adopts the connection form of an outer annular plate, an inner partition plate and cast steel. The connecting forms are suitable for heavy steel structure plants with large span and load. The joint has complex structure, large steel consumption, no avoidance of welding work on a construction site, low assembly degree and no suitability for beam-column connection of a light steel residential system. Meanwhile, the traditional joint connection structure does not consider the assembly connection of the prefabricated floor slab and the prefabricated wall body. At present, most of assembled walls are complicated to connect with traditional nodes, especially, the bottom nodes of the positions of foundation beams, the prefabricated floor slabs at the bottom beam column nodes are low in reliability of connection with the nodes, and structural measures such as water resistance, moisture resistance and the like are difficult to realize. 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. In addition, the square steel tube recycled concrete column has high bearing capacity, and the section width of the column can be controlled to be 100-150 mm in the light steel village and town house structure. 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 conclusion, the design of the light-weight fabricated square steel tube concrete column-H-shaped steel beam bottom connecting node which is simple in structure, clear in force transmission, excellent in anti-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 residential 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 bottom node and method of doing, the application of low, the light steel frame construction house bottom center pillar connected node of specially adapted, under the prerequisite of guaranteeing structure safe and reliable, improve the economic nature and the assembly efficiency of light steel house, provide the technological 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 bottom node and way of doing so to solve light steel frame house center pillar bottom 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 bottom position and steel shotcrete and beam column node dress 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 type center column bottom node and a manufacturing method thereof are disclosed, the node structure comprises a light square steel tube recycled concrete column (1), column plate tie bars (2), H-shaped steel beams (3), a pi-shaped connector (4), a web connecting plate (5), a 30mm long high-strength bolt (6), a floor slab shear-resistant stud (7), a pi-shaped connector upper limb (8), a pi-shaped connector lower limb (9), a rectangular bottom plate (10), a prefabricated steel support (11), a 70mm through high-strength bolt (12), an I-shaped stool tie bar (13), a grouting material supporting plate (14), a prefabricated recycled concrete floor slab (15) and a floor slab steel bar (16). As shown in fig. 1, 2, 3 and 4
The utility model discloses a each parts are connected and are constituteed the relation as follows: the column plate tie bar (2) is welded on the light square steel tube recycled concrete column (1) and is used for connecting a prefabricated recycled concrete floor slab (15); the pi-shaped connecting piece (4) 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 (4) is formed; the light square steel tube recycled concrete column (1) is welded with the Pi-shaped connecting piece (4), four edges of the outer edge of the rectangular bottom plate (10) on the Pi-shaped connecting piece (4) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four fillet welds 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 fillet welds at the inner edge, and therefore the light square steel tube recycled concrete column (1) is connected with 8 fillet welds at the outer side through the inner side and the single Pi-shaped connecting piece (4); 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 and lower flanges 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 (4) 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 prefabricated steel support (11) is connected with the pi-shaped connecting piece upper limb (8) through a high-strength bolt (6) with the length of 30mm and a through high-strength bolt (12) with the length of 70 mm; the prefabricated recycled concrete floor slab (15) 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 (15) is bound with each other through column plate tie bars (2), I-shaped stool tie bars (13) and floor slab steel bars (16) and is connected with each other through high-strength pouring grouting materials; the grouting material supporting plate (14) is pre-buried in the prefabricated recycled concrete floor slab (15); the I-shaped stool tie bars (13) are fixed at the web plate of the pi-shaped connecting piece upper limbs (8) through high-strength bolts (12) with the length of 70mm, and are bound with the floor slab reinforcing steel bars (16), and after high-strength grouting materials are poured, the pi-shaped connecting piece upper limbs (8) and the prefabricated recycled concrete floor slab (15) 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 used as a template for concrete pouring, so that construction is more convenient and cost is saved. 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 welding is on light-duty square steel tube recycled concrete post (1), and the welding position is in same high department with the reinforcing bar in prefabricated recycled concrete floor (15), and the interval is 50 mm. During assembly, column plate tie bars (2) and floor slab steel bars (16) are tied together, and high-strength grouting materials are poured in reserved hole positions between the prefabricated recycled concrete floor (15) 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 (15), 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 (2) due to stress concentration of the connecting constructional column with the 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 (4) 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 (4) 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 a 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 (4) 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 (4) to the light steel frame can be effectively prevented, and the continuous collapse of the structure is caused. 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 is mainly used for connecting and fastening the H-shaped steel beam (3), the pi-shaped connecting piece (4) and the web connecting plate (5) and connecting the prefabricated steel support (11) and the upper limb (8) of the pi-shaped connecting piece. 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 (15) 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 (15) 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 (4) 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 (4), 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 of the part from being corroded.
The steel support (11) is hot-rolled H-shaped steel and is 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 of the steel support (11) 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 (12) 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 (12) is an S8.8S or S10.3 grade high-strength bolt. The upper end of the prefabricated steel support (11) is positioned on the upper surface of the bottom gusset plate, and the lower end of the 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 (12) is connected with a bottom gusset plate of the 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 (13) 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 (13) with the pi-shaped connecting piece (4) is achieved.
The I-shaped bench tie bar (13) is a prefabricated three-dimensional reinforcement cage. The I-shaped stool tie bar (13) 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 (13) are composed of HRB335 phi 8 steel bars, the arch-shaped reinforcing mesh extends into a preformed hole of the prefabricated recycled concrete floor (15) and is bound with exposed floor steel bars (16), 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 (12), and two I-shaped stool tie bars (13) 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 (16) and the grouting material, and meanwhile, the anchoring end faces downwards, the steel bar net can be heightened to be positioned at the same height with the floor slab steel bar (16) 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 (16) and the column plate tie bars (2) so that the prefabricated recycled concrete floor slab (15), the Pi-shaped connecting piece (4) 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 (14) 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 (14) and has the length of 370mm and the width of 100 mm. The grouting material supporting plate (14) is embedded into the lower portion of the reserved hole before the prefabricated recycled concrete floor slab (15) 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 (15) 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 (16) are distributed reinforcing steel bars configured in the prefabricated recycled concrete floor slab (15), 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 (13).
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 bottom 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 (4) 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, and manufacturing 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 (4). 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 (4) 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 the pi-shaped connecting piece (4) to the light square steel tube recycled concrete column (1), and paying attention to the fact that the pi-shaped connecting piece (4) is connected with the side face of the light square steel tube recycled concrete column (1) in a sticking welding mode through the outer side fillet weld and the inner side fillet weld, therefore, the length of the weld is fully guaranteed due to the fact that the pi-shaped connecting piece (4) 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 on 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 prefabricated steel support (11) in a factory, purchasing hot-rolled H-shaped steel meeting the section size requirement, and grinding and cutting the hot-rolled H-shaped steel into a corresponding size. 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 (14) and a prefabricated recycled concrete floor slab (15), 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 (14) 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 (4) 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 (4) of the square steel pipe columns on the two sides, aligning the bolt holes on the pi-shaped connecting pieces (4) and the web plate 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. As shown in fig. 12.
The ninth step: and mounting the prefabricated steel support (11) on a corresponding position through a high-strength bolt. As shown in fig. 13.
The tenth step: and placing the I-shaped stool tie bars (13) at corresponding positions, screwing up the 70mm through high-strength bolts (13) and fixing the I-shaped stool tie bars (13) 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 (13) are bound on the floor slab steel bar (16). And binding the longitudinal tie bars with the column plate tie bars (2) and the floor slab reinforcing steel bars (16). As shown in fig. 14.
The eleventh 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 (13), the grouting material supporting plates (14) and the like, and performing subsequent construction after maintenance is completed. As shown in fig. 15.
Compared with the prior art, the utility model relates to a be suitable for pi shape connecting piece center pillar bottom node and way of doing that steel core concrete column-H shaped steel roof beam-steel shotcrete is connected has following advantage:
1. the utility model discloses creative this structure of adoption pi shape connecting piece (4) carries out the assembly connection between roof beam post: the height of the beam column node area is increased by the pi-shaped connecting piece (4), and the shearing resistance and bearing capacity of the node are improved. Meanwhile, the rectangular bottom plate (10) 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 bolt hole of an upper limb (8) of the pi-shaped connecting piece in the pi-shaped connecting piece (4) is connected with a bottom connecting plate of the 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 (15) is provided with a hole at the connecting part of the prefabricated recycled concrete floor and the pi-shaped connecting piece upper limb (8), the floor reinforcing steel bar (16) is exposed inside the prefabricated recycled concrete floor, and the floor reinforcing steel bar (16) is bound with the I-shaped stool tie reinforcing steel bar (13). The I-shaped stool tie bar (13) is fixed with the pi-shaped connecting piece upper limb (8) through a 70mm through high-strength bolt (12). 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. It is favorable for the construction of structures such as water-proof and damp-proof houses, heat preservation, water-proof and the like. The utility model discloses well prefabricated floor assembled position is located 300mm department more than the basis, and the bottom separates with the basis, more is favorable to house one deck dampproofing and waterproofing. Meanwhile, the pi-shaped connecting piece at the upper flange of the node is poured together with the floor slab, so that the installation of an external wall body and a heat insulation structure is facilitated, a cold bridge is avoided to a certain extent, and the heat insulation and energy conservation of a house are facilitated.
6. 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.
7. 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 at the engineering, 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.
8. 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.
Fig. 12 step 8-assembly of the floor slab.
FIG. 13 step 9-assembly of the steel support.
FIG. 14 step 10-Straps fix bench rebar.
Fig. 15 step 11 — pour grout.
Detailed Description
The following further describes the present invention with reference to specific embodiments.
As shown in fig. 3, the combined type center column bottom node of the steel tube concrete column, the H-shaped steel beam, the steel support and the pi-shaped connector comprises a light square steel tube recycled concrete column (1), column plate tie bars (2), the H-shaped steel beam (3), the pi-shaped connector (4), a web connecting plate (5), a 30mm long high-strength bolt (6), a floor shear bolt nail (7), a pi-shaped connector upper limb (8), a pi-shaped connector lower limb (9), a rectangular bottom plate (10), a prefabricated steel support (11), a 70mm through high-strength bolt (12), an i-shaped stool tie bar (13), a grouting material supporting plate (14), a prefabricated recycled concrete floor (15) and a floor steel bar (16).
The bearing capacity required by the square steel tube recycled concrete column can be calculated according to the building load, and the square steel tube recycled concrete column can be adjusted by adjusting the outer diameter and thickness of the steel tube, the strength of recycled concrete and the like. The method comprises the steps of designing the main parameters of the flange and web thickness, the beam height, the cantilever length and the like of an upper flange connecting piece and a lower flange connecting piece of a Pi-shaped connecting piece according to the bending moment and the shearing force of the beam end of the H-shaped steel, and determining the length and the thickness of a rectangular bottom plate, the size of a central opening and the like. Meanwhile, the length and the thickness of the web connecting plate are adjusted according to the axial force, the shearing force and the bending moment of the end of the H-shaped steel beam, and the number of bolts needed by a node area, the length of a welding seam and the like are calculated. 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.
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. After the data are determined, the procedures of blanking, production, construction, assembly and the like can be carried out.
And designing the plate column tie bars and the bench-shaped tie bars 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.
At the normal use stage, pi shape connecting piece has increased the height in beam column nodal region, consequently the node has great rigidity at the elastic working stage, has effectively controlled the deformation of I shape cross-section roof beam, has avoided the too big and external vibrations load excitation underbeam seismic amplitude too big defect of roof beam amount of deflection under normal use state.
Simultaneously, in this node floor and pi shape connecting piece have carried out effective connection through structures such as stool shape and high strength bolt, and later stage pouring grout material back has all strengthened pi shape connecting piece. The upper limb of the Pi-shaped connecting piece is simultaneously connected with the bottom beam and the steel support, the upper flange of the Pi-shaped connecting piece is subjected to local pressure and shearing force transmitted by the steel support, and the lower flange of the Pi-shaped connecting piece is subjected to axial force, bending moment and shearing force transmitted by the bottom beam and is in a complex stress state as a whole. After grouting materials are poured around the web plate, the local bearing performance and the shearing resistance bearing capacity of the web plate are greatly improved. Therefore, the bending rigidity of the node area is improved, and the shearing resistance and the bearing capacity are improved. The integrity of the slab-column-joint and the integrity of the joint areas on both sides are enhanced by the stool-shaped tie bars and the slab-column tie bars.
Meanwhile, in order to meet the design principle of 'strong node and weak member', the beam-column node is reinforced, and the I-shaped steel beam connected with the node is damaged before the node. The utility model relates to a beam column node, pi shape connecting piece and web connecting plate use welded connection with square steel tube recycled concrete column, adopt bolted connection with H shaped steel roof beam, after beam-ends shear force and moment of flexure transmission to bolt and welding seam, the bolt is cut off and is brittle failure with the welding seam fracture. It is therefore necessary to ensure an adequate safety reserve of welds and bolts at the design stage. The failure mode of the node is designed to be beam end deformation failure, the failure position of the steel beam is concentrated at the bolt hole of the beam flange under the action of an earthquake, and the section of the steel beam flange at the position undergoes the process from yielding to breaking, which is a slow process with obvious deformation and has ideal ductile failure characteristics. Node is pi-shaped connecting piece in the main power consumption region of seismic action, thereby the I-steel was encorbelmented the edge of a wing of stub beam and is taken place to warp and consume partial seismic energy about pi-shaped connecting piece under reciprocal load effect, thereby the web of the upper and lower I-steel was encorbelmented the stub beam will exert stiffening rib's effect, forms the depression bar truss system that draws of tie beam end, also can consume partial seismic energy when control node warp. Along with the increase of horizontal earthquake action, the Pi-shaped connecting piece serving as the first anti-seismic defense line of the node fails, and the web connecting plate serving as the second anti-seismic defense line can still continue to work to prevent the collapse of the I-shaped steel beam. At the moment, the floor slabs in the node areas are mutually extruded, the cracks between the floor slabs at the beam ends and the wall are widened and even completely cracked, the duration of the process is long, and people can be evacuated. Because different beam column nodes are not directly related, the failure of a certain node can not cause the failure of other nodes at the position, thereby conforming to the design principle of 'strong column and weak beam'.
Adopt a steel core concrete column-H shaped steel roof beam-steel shotcrete-pi shape connecting piece combination formula center pillar bottom node firm in connection, wholeness good, the assembly is convenient, green, be applicable to low, many light steel frame and light steel truss residential building system beam column assembly a novel nodal connection pattern.
The above is an exemplary embodiment of the present invention, and the implementation of the present invention is not limited thereto.

Claims (9)

1. The utility model provides a steel core concrete column H type roof beam supports pi combination formula center pillar bottom node which characterized in that: the column plate tie bar (2) is welded on the light square steel tube recycled concrete column (1) and is used for connecting a prefabricated recycled concrete floor slab (15); the pi-shaped connecting piece (4) 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; the light square steel tube recycled concrete column (1) is welded with the Pi-shaped connecting piece (4), four edges of the outer edge of the rectangular bottom plate (10) on the Pi-shaped connecting piece (4) are welded with the steel tube wall of the light square steel tube recycled concrete column (1) to form four fillet welds 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 fillet welds at the inner edge, and the light square steel tube recycled concrete column (1) is connected with the single Pi-shaped connecting piece (4) through eight fillet welds 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 and lower flanges 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 (4) 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 prefabricated steel support (11) is connected with the pi-shaped connecting piece upper limb (8) through a high-strength bolt (6) with the length of 30mm and a through high-strength bolt (12) with the length of 70 mm; the prefabricated recycled concrete floor slab (15) 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 (15) is bound with each other through column plate tie bars (2), I-shaped stool tie bars (13) and floor slab steel bars (16) and is connected with each other through high-strength pouring grouting materials; the grouting material supporting plate (14) is pre-buried in the prefabricated recycled concrete floor slab (15); the I-shaped stool tie bars (13) are fixed at the web plate of the pi-shaped connecting piece upper limbs (8) through high-strength bolts (12) with the length of 70mm, and are bound with the floor slab reinforcing steel bars (16), and after high-strength grouting materials are poured, the pi-shaped connecting piece upper limbs (8) and the prefabricated recycled concrete floor slab (15) are integrated.
2. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the square steel tube in the light square steel tube recycled concrete column (1) is a square hot-rolled seamless steel tube; and filling recycled concrete.
3. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the column plate tie bar (2) is a steel bar with a bending anchoring end.
4. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the H-shaped steel beam (3) is a bearing component in a light steel frame structure; the light steel composite structure adopts hot-rolled H-shaped steel beams as main beams or secondary beams.
5. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: 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 (10); the web plate connecting plate (5) is connected with the web plate of the H-shaped steel beam (3) through a high-strength bolt (6) with the length of 30 mm.
6. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the floor shear-resistant stud (7) is used as a floor shear key for reinforcing the connection structure of the H-shaped steel beam (3) and the fabricated concrete slab, and high-strength grouting material is poured at the reserved hole of the floor shear-resistant stud (7) after the prefabricated recycled concrete floor (15) is assembled, so that the connection of the H-shaped steel beam (3) and the prefabricated recycled concrete floor (15) is completed.
7. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the Pi-shaped connecting piece (4) 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.
8. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the rectangular bottom plate (10) is a rectangular steel plate with a hole in the center;
the steel support (11) is hot-rolled H-shaped steel and is arranged between two adjacent light square steel tube recycled concrete columns (1) at an angle of 60-45 degrees; the width of the flange of the steel support (11) is equal to that of the upper limb (8) of the Pi-shaped connecting piece.
9. The bottom node of the combined center pillar with the pi-shaped support for the H-shaped beam of the concrete filled steel tubular column as claimed in claim 1, wherein: the I-shaped stool tie bar (13) is a prefabricated three-dimensional reinforcement cage; the I-shaped stool tie bar (13) is composed of 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 grouting material supporting plate (14) is a thin steel plate with three edges welded with embedded anchoring steel bar hooks.
CN202021631407.1U 2020-08-07 2020-08-07 Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node Active CN213539881U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021631407.1U CN213539881U (en) 2020-08-07 2020-08-07 Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021631407.1U CN213539881U (en) 2020-08-07 2020-08-07 Steel core concrete column H type roof beam supports pi combination formula center pillar bottom node

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Publication Number Publication Date
CN213539881U true CN213539881U (en) 2021-06-25

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Country Link
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