Mixed dry type connection assembly integral type concrete frame cross-shaped beam-column joint
By using a hybrid and dry -assembly assembly rectangular concrete frame cross beam node in the prefabricated building, the problem of tedious and slippery phenomenon of node connection and slippery phenomenon is solved, and the earthquake resistance and bearing capacity of the building structure is improved, and the materials are realized, and the materials are realized. Simplicity and construction.
Patent Information
- Application Number
- CN202411827728.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-01-21
AI Technical Summary
In existing prefabricated buildings, node connections are cumbersome and slippage is prone to occur, resulting in reduced seismic performance of the building structure, weakened load-bearing capacity, and lack of stability and continuity. At the same time, the traditional floor bearing plate installation method increases the consumption of building materials, affecting the openness of the space and the comfort of use.
The cross-shaped beam-column joints of the integral concrete frame are assembled using hybrid dry connections. The dry connection of the beam-column joints is achieved through a combination of precast columns, semi-precast beams, steel plate connecting keys, inverted corbels, plate hoops and post-poured concrete superimposed layers. connection and overall assembly.
It has improved the overall, continuity and economics of prefabricated concrete cross nodes, enhanced the shear ability and bearing capacity of the beam and pillar nodes, avoids slippery phenomena, and reduced material consumption and construction complexity.
Smart Images
Figure CN119332806A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of building construction, and more specifically, relates to a hybrid dry-type connection assembled integral concrete frame cross-shaped beam-column node. Background Art
[0002] Prefabricated structure is one of the important forms of development of building structure. Compared with traditional cast-in-place structure, the advantages of prefabricated structure are: effectively reducing environmental pollution, building material loss and construction waste, convenient construction, large space for optimization of reinforcement and connection structure, low labor intensity and low cost, etc.
[0003] At present, the node connections in modern prefabricated buildings are mostly connected by sleeves, and then concrete is poured at the nodes to form an overall frame structure. However, this method is cumbersome in on-site construction, and the sleeve and concrete are prone to "slippage", resulting in a certain decline in the overall seismic performance of the building structure, weakened bearing capacity, and lack of stability and continuity. At the same time, when installing the floor deck in the traditional prefabricated way, the floor deck is installed above the complete beam. This installation method increases the thickness of the floor slab, which means additional consumption of building materials, and directly leads to a reduction in the net height inside the building, affecting the openness of the space and the comfort of use.
[0004] Therefore, in order to further improve the integrity, continuity and economy of the prefabricated concrete cross node, the present invention has developed a hybrid dry-connected prefabricated integral concrete frame cross beam-column node according to relevant regulations. Summary of the invention
[0005] The purpose of the present invention is to solve the deficiencies in the above-mentioned background technology, and to provide a hybrid dry-connected assembled monolithic concrete frame cross-shaped beam-column node, which is suitable for assembled beam-column connection, and does not need to place the floor decking on top of the beam, but places the top of the beam flush with the upper surface of the floor decking. After laying the main reinforcement on the top of the beam, the post-cast concrete superimposed layer and the floor slab are integrally cast to complete the installation of the floor decking.
[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution: A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node of the present invention comprises a semi-prefabricated beam, a prefabricated column, a steel plate connection key, an inverted corbel, a plate hoop 1, a plate hoop 2 and a post-cast concrete superposition layer; The precast column is connected vertically at the node, and the steel plate connecting key is arranged on the surface of the two symmetrical side surfaces of the precast column at the lower part of the node area, flush with the bottom of the semi-precast beam, and fixed to the precast column by oblique tie bars. The steel plate connecting key and the oblique tie bars are cast in concrete to form an inverted corbel; the inverted corbel is used as a corbel in installation and positioning, and also acts as a shear key in structural stress; The semi-prefabricated beam is placed on the inverted corbel, and the semi-prefabricated beam is respectively connected to the second prefabricated column plate hoop and the steel plate connecting key bolts through the main reinforcement of the beam top and the beam bottom; The two ends of the symmetrical steel plate connecting keys on both sides of the prefabricated column are respectively connected with steel plates to form a rectangular plate hoop 1 of the same size as the prefabricated column, and the plate hoop 1 is arranged at a position corresponding to the main reinforcement of the bottom of the semi-prefabricated beam at the lower part of the node area; The corresponding position of the main reinforcement of the upper beam top in the node area of the prefabricated column is enclosed and connected by a steel plate to form a rectangular plate hoop 2 with the same size as the column; The steel plate connection keys of the plate hoop 2 and the plate hoop 1 are provided with through holes at positions corresponding to the main reinforcement of the semi-prefabricated beam; The post-cast concrete superimposed layer is arranged on the top of the semi-precast beam, and is formed by covering the main reinforcement skeleton on the upper part of the semi-precast beam through overall secondary pouring of concrete to form a post-cast reinforced concrete layer.
[0007] Furthermore, the oblique reinforcement is connected to the steel plate connecting key, the angle between the oblique reinforcement and the prefabricated column is 45°, and a hook is provided at the end to connect with the vertical main reinforcement in the column.
[0008] Furthermore, the oblique tie bars are connected to the steel plate connecting keys by welding or mechanical means.
[0009] Furthermore, the width of the steel plate connecting key should be no less than 5t, the height should be consistent with the width, no more than 1 / 3 of the beam height, and the length should be consistent with the beam width, where t is the nut thickness, and the sizes of the plate hoop one and plate hoop two should be consistent with the sizes of the prefabricated column.
[0010] Furthermore, the prefabricated column is provided with a through hole at a position corresponding to the main reinforcement of the semi-prefabricated beam top at the upper node area, and the main reinforcement of the semi-prefabricated beam top passes through the semi-prefabricated beam stirrup, the second plate hoop and the through hole on the prefabricated column in sequence, so that the main reinforcement of the beam top on both sides of the prefabricated column is connected, and a single nut is used to fix the outer side of the symmetrical steel plate with the through hole provided on the second plate hoop, so that the second plate hoop does not slip and fits tightly with the column surface; The prefabricated column beam bottom main reinforcement is pre-embedded with connecting steel bars, which pass through the prefabricated column and the through holes on the steel plate close to the column side of the symmetrical steel plate connecting keys on both sides of the prefabricated column. The steel plate connecting keys are fixed to the column with nuts on the inner side of the steel plate, so that they will not fall off or slip and will fit tightly to the column surface.
[0011] Furthermore, the beam main reinforcement reinforced connection node formed by the plate hoops 1 and 2 and the main reinforcements at the bottom and top of the semi-prefabricated beam can resist the deformation of the prefabricated column in the node area and enhance the shear resistance of the column; the formed beam-column dry connection node directly transmits force without grouting, improves the anchoring capacity of the beam main reinforcement and the ability to resist positive bending moment, and increases the bearing capacity of the beam-column node by 20%.
[0012] Furthermore, the beam-column dry connection node does not require grouting to directly transmit force, and plastering and leveling are performed at the bottom of the steel plate connection key to achieve anti-corrosion protection of the connection node; the plastering thickness should not exceed 35 mm.
[0013] Furthermore, the main reinforcement at the bottom of the semi-prefabricated beam is provided with an overhanging section, and a trapezoidal notch is reserved on the lower side for engaging with the inverted corbel. During installation, the slope surface of the trapezoidal notch is closely fitted with the slope surface of the inverted corbel of the prefabricated column.
[0014] Furthermore, the through holes opened at the upper part of the prefabricated column node area and at the positions corresponding to the top reinforcements of the prefabricated beams are reserved during the factory production; Furthermore, the through holes opened at the upper part of the prefabricated column node area and at the positions corresponding to the top reinforcements of the prefabricated beams are reserved during the prefabrication process in the factory.
[0015] Further, the construction method of a hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node, the method implementation steps are as follows: S1. Production of prefabricated components: Connect the steel plate connection key with the oblique reinforcement, and cast concrete as a whole to form an inverted corbel; connect the prefabricated column with the steel plate connection key, and connect the two ends of the steel plate connection key with steel plates to form a plate hoop of the same size as the column; open a through hole at the corresponding position of the main reinforcement at the bottom of the beam on the steel plate connection key and the prefabricated column, penetrate the steel plate with the through hole in the plate hoop, and set threaded sections at both ends of the steel bar, and fix it with single nuts on the steel plates on both sides; A threaded section is set at the end of the main reinforcement at the bottom of the semi-precast beam and passes through the steel plate connecting key away from the steel plate on the side of the column. The steel plate is clamped with nuts. The inner side of the steel plate is fixed with double nuts and the outer side is fixed with a single nut to prevent loosening and falling off. A second plate hoop is arranged on the outer side of the upper part of the prefabricated column node area, and a through hole is provided on the plate hoop steel plate at the position corresponding to the longitudinal force-bearing main reinforcement on the top of the beam. The main reinforcement on the upper side of the semi-prefabricated beam passes through the plate hoop and the column in sequence, and a single nut is used to connect the outer side of the steel plate with the through hole on the second plate hoop; the semi-prefabricated beam is provided with the main reinforcement and stirrups at the bottom of the beam, and a post-cast concrete superposition layer is reserved at the top of the beam, the stirrups extend from the top of the beam, and a trapezoidal notch is reserved on the lower side for engaging with the inverted corbel, and the main reinforcement at the bottom of the semi-prefabricated beam is provided with an overhanging section and a thread is provided; S2. Hoisting and placing of semi-precast beams: Pass the main reinforcement at the bottom of the beam through the holes reserved for the steel plate connection keys in the plate hoops, and use nuts to anchor the main reinforcement at the bottom of the beam and the main reinforcement that passes through the precast column; after the connection nuts are assembled, plaster and level the bottom opening of the steel plate connection keys to protect the steel bar connection nodes; the main reinforcement at the top of the beam passes through the semi-precast beam hoops to make the main reinforcement at the top of the beams on the left and right sides continuous; S3. Integral casting: Tie the top steel bars and node structural bars of the slab, integrally cast the floor slab and semi-precast beams, and then cast the concrete overlay layer to form an integrally assembled cross-shaped beam-column node.
[0016] Working principle: The present invention discloses a cross-shaped beam-column node of a hybrid dry-type connection assembly integral concrete frame, wherein the precast column is connected vertically at the node, and the steel plate connection keys are arranged symmetrically on the surfaces of the two side surfaces of the precast column at the lower part of the node area; the surface of the precast column connecting one side of the semi-precast beam in the node area is flush with the upper and lower surfaces of the semi-precast beam, and is fixed to the precast column by oblique tie bars, and the steel plate connection key and the oblique tie bars are cast and prefabricated into one body by concrete to form an inverted corbel; the two ends of the two symmetrical steel plate connection keys on both sides of the precast column are connected by steel plates to form a connection plate of the same size as the precast column. The rectangular plate hoop one is formed, and the embedded connecting steel bar in the column passes through the plate hoop one and is connected with nuts; the steel plate corresponding to the main reinforcement of the top beam of the node domain is enclosed to form the plate hoop two, and the main reinforcement of the top beam passes through the plate hoop two and is connected with nuts; the semi-precast beam is placed on the inverted corbel, and the main reinforcement at the bottom of the semi-precast beam is mechanically connected with the steel plate connecting keys on both sides; the upper main reinforcement skeleton of the semi-precast beam is covered with the post-cast reinforced concrete layer formed by the overall secondary pouring of concrete, the cross-shaped beam-column node assembly is completed, and the bottom of the steel plate connecting key is plastered and leveled to achieve the anti-corrosion effect.
[0017] Beneficial effects of the present invention: The present invention is quick to install and easy to install on site, which saves space and has excellent integrity, stability and continuity. The bearing capacity of the beam is improved by bonding and reinforcing the main reinforcement of the beam. The use of a combination of prefabrication and cast-in-place overcomes the problem of weak seismic performance of the fully prefabricated structure, and does not require grouting, avoiding the "slip" phenomenon between the mechanical connection and the concrete, and realizing a dry connection. At the same time, the integral floor slab and the post-cast concrete layer of the beam save materials and space, reduce costs, and improve economy compared to the previous beam-column node connection method. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a front view of a cross-shaped beam-column node structure of a hybrid dry-connected assembled integral concrete frame; Figure 2 Detail of the inverted corbel of a cross-shaped beam-column joint of a monolithic concrete frame assembled for a hybrid dry connection; Figure 3 A front view of a steel plate connection key and plate hoop of a cross-shaped beam-column node of a hybrid dry-type connection assembly integral concrete frame; Figure 4 A left view of a steel plate connection key and plate hoop of a cross-shaped beam-column node of a hybrid dry-type assembled integral concrete frame; Figure 5 A top view of a steel plate connection key and plate hoop of a cross-shaped beam-column node of a hybrid dry-type connection assembly integral concrete frame; Figure 6It is a plate hoop two structural diagram of a cross-shaped beam-column node of a hybrid dry-connected assembled monolithic concrete frame; Figure 7 This is a cross-section diagram of a cross-shaped beam-column node of a hybrid dry-connected assembled monolithic concrete frame during pouring; Figure 8 The three-dimensional view of the plate hoop 1 and plate hoop 2 of a cross-shaped beam-column node of a hybrid dry-type assembled integral concrete frame; In the figure: 1. Precast column; 2. Semi-precast beam; 3. Steel plate connection key; 4. Inverted corbel; 5. Main reinforcement at the bottom of the beam; 6. Main reinforcement at the top of the beam; 7. Connecting steel bars; 8. Stirrups; 9. Plate hoop 1; 10. Square timber; 11. Nuts; 12. Floor slab; 13. Post-cast concrete superposition layer; 14. Temporary support; 15 Diagonal tie bars; 16. Plate hoop 2; 17 Steel truss floor slab; 18 Precast column main reinforcement; 19 Pad; 20. Steel plate DETAILED DESCRIPTION
[0019] The technical scheme in the embodiment of the present invention will be further explained below in conjunction with the drawings in the embodiment of the present invention. In addition, all the connection / connection relationships mentioned in the text do not simply refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.
[0020] See also Figure 1-8 The invention discloses a cross-shaped beam-column node structure of a hybrid dry-type connection assembly integral concrete frame, including a front view, a detail view of an inverted corbel, a three-view view of a steel plate connection key and a plate hoop 1, a three-view view of a plate hoop 2, a cross-sectional view during casting, and a three-dimensional view of a plate hoop 1 and a plate hoop 2. The structure includes a precast column 1, a semi-precast beam 2, a steel plate connection key 3, an inverted corbel 4, a plate hoop 2 16, a plate hoop 1 9, and a post-cast concrete superimposed layer 13.
[0021] The precast column 1 is through-through at the node, and the embedded semi-precast beam main reinforcement 7 is located at the lower part of the node area. The steel plate connection key 3 is arranged on the surface of the symmetrical position on both sides of the precast column 1, and the oblique tie reinforcement 15 is located at the top plate of the steel plate connection key 3 on the side of the semi-precast beam 2, and the steel plate connection key 3 and the oblique tie reinforcement 15 are prefabricated with the concrete casting to form an inverted bracket 4; the two ends of the steel plate connection key 3 symmetrical on both sides of the precast column 1 are welded and connected by steel plates 20 to form a rectangular plate hoop 9 of the same size as the precast column 1. The steel plate connection key 3 has through holes in the steel plate 20 at the corresponding positions of the semi-precast beam main reinforcement 7 and the beam bottom main reinforcement 5 in the column, and the semi-precast beam main reinforcement 7 in the column passes through the holes of the steel plate 20 on the side of the precast column 1, and the steel plate 20 is locked and clamped by nuts 11, and connected by double nuts 11 on the outside of the steel plate 20, so that the embedded semi-precast beam main reinforcement 7 is tightly connected to the precast column 1. A steel plate 20 is welded around the upper part of the node area of the prefabricated column 1 to form a plate hoop 16 of the same size as the prefabricated column 1, and a through hole is opened in the steel plate 20 at the corresponding position of the main reinforcement 6 on the top of the beam. The main reinforcement 6 on the top of the beam passes through the through hole of the plate hoop 16 located on the upper part of the node area of the prefabricated column 1, and is anchored with a single nut 11 on the outer side of the steel plate 20 with the through hole, so as to control the main reinforcement 6 on the top of the beam from slipping.
[0022] The semi-precast beam 2 is equipped with the main reinforcement 5 and stirrups 8 at the bottom of the beam, and a post-cast concrete superposition layer 13 is reserved at the top of the beam. A trapezoidal notch is reserved on the lower side of the semi-precast beam 2 to engage with the inverted bracket 4. During installation, the slope of the trapezoidal notch is closely fitted with the slope of the inverted bracket 4 of the precast column 1. The main reinforcement 5 at the bottom of the beam passes through the hole of the steel plate 20 on the side of the steel plate connecting key 3 close to the semi-precast beam 2, and is anchored by a single nut 11 on the outside of the steel plate connecting key 3 and a double nut 11 on the inside. A good overlap of the steel bars 5 at the bottom of the beam is achieved, ensuring that the node has a good ability to resist positive bending moments, and achieving bonding and anchoring reinforcement of the main reinforcement of the semi-precast beam 2. Finally, the floor concrete superposition layer 13 is cast as a whole to form an assembled integral cross-shaped beam-column node.
[0023] The steel plate connection key 3 is mechanically connected to the main reinforcement 5 at the bottom of the beam to form a dry connection node, which directly transmits force without grouting; plastering and leveling can be used to achieve anti-corrosion protection of the main reinforcement of the semi-prefabricated beam 2. Figure 7 As shown, when installing the beam-column node, temporary supports 9 and square timbers 14 need to be set up on the left and right of the semi-prefabricated beam 2. They are used to place and lay the steel truss floor deck 17 and then tie the structural steel bars. After the main reinforcement 6 on the top of the beam is configured, the post-cast concrete superposition layer 13 of the semi-prefabricated beam 2 and the floor slab 12 are poured to realize the assembled integral beam-column node. The purpose of saving materials and space is achieved, thereby forming a hybrid connection assembled integral frame beam-column cross node.
[0024] The specific structure of the inverted bracket 4, the plate hoop 1 9, the plate hoop 2 16 and the steel plate connecting key 3 is as follows: Figure 2-6As shown, holes are provided in the steel plates 20 on both sides of the steel plate connection box 3, and the steel plate connection keys 3 on the left and right sides of the prefabricated column 1 are connected by welding the steel plates 20 to form a plate hoop 9 of the same size as the prefabricated column 1. One side of the hole on the steel plate 20 of the plate hoop 9 is used to connect the semi-prefabricated beam main reinforcement 7 running through the column through the nut 11, ensuring that the semi-prefabricated beam main reinforcement 7 in the column does not slip, and plays a restraining role on the prefabricated column 1; the hole on the other side is used to pass through the beam bottom main reinforcement 5, and is connected and tightened with the extended end of the beam bottom main reinforcement 5 through the nut 11, so that the inverted corbel 4 is closely fitted with the trapezoidal notch of the semi-prefabricated beam 2, completing the overall assembled connection of the cross-shaped beam-column node. The steel plate connecting key 3 can achieve good overlap of the main reinforcement 5 at the bottom of the beam, the plate hoop 1 9 anchors the main reinforcement at the bottom of the beam, the main reinforcement 6 at the top of the beam passes through the plate hoop 2 16, and is connected by a single nut 11 on the inside and outside of the steel plate to ensure that the main reinforcement of the semi-prefabricated beam 2 does not slip, thereby improving the bonding and anchoring capacity of the main reinforcement of the semi-prefabricated beam 2, and achieving an increase in the bearing capacity of the reinforced concrete beam-column node by more than 20%.
[0025] The specific implementation scheme of the above beam-column node comprises the following steps: S1: Production of prefabricated components: Connect the steel plate connection key 3 with the oblique tie bar 15, and cast concrete as a whole to form an inverted corbel 4; connect the precast column 1 with the steel plate connection key 3, and weld the two ends of the steel plate connection keys 3 symmetrically on both sides of the precast column 1 with steel plates 20 to form a plate hoop 9 of the same size as the precast column 1; Through holes are opened on both sides of the steel plate connecting key 3 at positions corresponding to the main reinforcement 5 at the bottom of the beam and the main reinforcement 7 of the semi-precast beam that passes through the precast column. The main reinforcement 7 of the semi-precast beam that passes through the precast column is connected to the steel plate 20 on the side of the symmetrical steel plate connecting key 3 close to the precast column 1. Threaded sections are provided at both ends of the steel bar and fixed with double nuts. A plate hoop 16 is arranged on the outer side of the upper part of the node area of the precast column 1, and a through hole is opened at a position corresponding to the main reinforcement 6 at the top of the beam.
[0026] The semi-precast beam 2 is provided with main reinforcement 5 and stirrups 8 at the bottom of the beam, and a semi-precast beam top post-cast concrete superposition layer 13 is reserved. The stirrups 8 extend from the top of the beam, and a trapezoidal notch is reserved at the lower side for engaging with the inverted bracket 4. The main reinforcement 5 at the bottom of the semi-precast beam 2 is provided with an extended section and a thread is provided at the end; the main reinforcement 6 at the top of the semi-precast beam 2 passes through the plate hoop 16 and the precast column 1 in sequence, and is connected with a single nut 11 on the outer side of the through-hole steel plate 20; so that the main reinforcement 6 at the top of the semi-precast beam 2 on the left and right sides is continuous, S2: hoisting the semi-prefabricated beam 2 into place: pass the main reinforcement 5 at the bottom of the beam through the steel plate connection key 3 in the plate hoop 9 close to the hole of the steel plate 20 of the semi-prefabricated beam 2, and use nuts 11 to lock and clamp the steel plate on the outside of the steel plate 20, and use double nuts 11 to fix it on the inside to prevent loosening and falling off; after the connection nuts are assembled, plaster and level the bottom opening of the steel plate connection key 3 to protect the steel bar connection node; S3: Integral casting: Tie the top steel bars and node structural bars of the slab, integrally cast the floor slab and the semi-precast beam post-cast concrete superposition layer 13 to form an integrally assembled cross-shaped beam-column node.
[0027] In the embodiment of the present invention, the oblique tie bar 15 is connected to the steel plate connecting key 3, the angle between the oblique tie bar 15 and the prefabricated column 1 is 45°, and a hook is provided at the end to connect with the vertical main reinforcement in the column.
[0028] Preferably, the connecting key between the oblique steel bars and the steel plate is connected by welding or mechanical connection.
[0029] In the embodiment of the present invention, the main reinforcement 5 at the bottom of the semi-prefabricated beam is provided with an extended section, and a trapezoidal notch is reserved at the lower side for engaging with the inverted bracket 4. When installing, the slope surface of the trapezoidal notch is closely fitted with the slope surface of the inverted bracket 4 of the prefabricated column 1. In the embodiment of the present invention, the steel plate connecting key 3 is connected with the main reinforcements 5 and 6 at the bottom and top of the beam to form a dry connection node, which does not require grouting to directly transmit force. Plastering and leveling are performed at the bottom of the steel plate connecting key 3 to achieve anti-corrosion protection of the connection node; the plastering thickness should not exceed 35 mm;.
[0030] In the embodiment of the present invention, the steel plate connecting key 3, the plate hoop 1 9 and the plate hoop 2 16 are respectively connected to the main bars 5 and 6 at the top and bottom of the beam to form a beam main bar reinforced connection node, improve the anchoring capacity of the beam main bar and the ability to resist positive bending moment, so that the bearing capacity of the beam-column node is increased by 20%; In the embodiment of the present invention, the steel plate connecting key 3 and the oblique tie rod 15 are connected by welding or mechanical means.
[0031] In the embodiment of the present invention, the width of the steel plate connecting key 3 should be no less than 5t, the height should be consistent with the width, no more than 1 / 3 of the height of the semi-prefabricated beam 2, and the length should be consistent with the width of the semi-prefabricated beam 2, where t is the nut thickness, and the sizes of the plate hoop 1 9 and the plate hoop 2 16 should be consistent with the sizes of the prefabricated column 1.
[0032] In the embodiment of the present invention, the semi-prefabricated beam 2 reserves a post-cast concrete layer superposition layer 13, which is conducive to ensuring the same structural layer thickness as the cast-in-place RC structure, can save materials and space, and has excellent integrity, thereby achieving the purpose of assembly integrity.
[0033] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all of the embodiments. Any other embodiments obtained by technicians in this field based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.
Claims
1. A cross-shaped beam-column node of a hybrid dry-type assembled integral concrete frame, characterized in that: It includes semi-precast beams, precast columns, steel plate connecting keys, inverted corbels, plate hoops 1, plate hoops 2 and post-cast concrete superposition layers; The precast column is connected vertically at the node, and the steel plate connecting key is arranged on the surface of the two symmetrical side surfaces of the precast column at the lower part of the node area, flush with the bottom of the semi-precast beam, and fixed to the precast column by oblique tie bars. The steel plate connecting key and the oblique tie bars are cast in concrete to form an inverted corbel; the inverted corbel is used as a corbel in installation and positioning, and also acts as a shear key in structural stress; The semi-prefabricated beam is placed on the inverted corbel, and the semi-prefabricated beam is respectively connected to the prefabricated column plate hoop 2 and the steel plate connecting key bolts through the main reinforcement of the beam top and the beam bottom; The two ends of the symmetrical steel plate connecting keys on both sides of the prefabricated column are respectively connected with steel plates to form a rectangular plate hoop 1 of the same size as the prefabricated column, and the plate hoop 1 is arranged at a position corresponding to the main reinforcement of the bottom of the semi-prefabricated beam at the lower part of the node area; The corresponding position of the main reinforcement of the upper beam top in the node area of the prefabricated column is enclosed and connected by a steel plate to form a second rectangular plate hoop of the same size as the column; The steel plate connection keys of the plate hoop 2 and the plate hoop 1 are provided with through holes at positions corresponding to the main reinforcement of the semi-prefabricated beam; The post-cast concrete superimposed layer is arranged on the top of the semi-precast beam, and is formed by covering the main reinforcement skeleton on the upper part of the semi-precast beam through overall secondary pouring of concrete to form a post-cast reinforced concrete layer.
2. A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node according to claim 1, characterized in that: The oblique reinforcement is connected to the steel plate connecting key, the angle between the oblique reinforcement and the prefabricated column is 45 degrees, and a hook is provided at the end to connect with the vertical main reinforcement in the column.
3. A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node according to claim 2, characterized in that: The oblique tie bars are connected to the steel plate connecting keys by welding or mechanical means.
4. A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node according to claim 1, characterized in that: The width of the steel plate connecting key should be no less than 5t, the height should be consistent with the width, no more than 1 / 3 of the beam height, and the length should be consistent with the beam width, where t is the nut thickness, and the sizes of the plate hoops one and two should be consistent with the sizes of the prefabricated columns.
5. A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node according to claim 1, characterized in that: The prefabricated column is provided with a through hole at a position corresponding to the main reinforcement of the semi-prefabricated beam top at the upper part of the node area, and the main reinforcement of the semi-prefabricated beam top passes through the semi-prefabricated beam stirrup, the second plate hoop and the through hole on the prefabricated column in sequence, so that the main reinforcement of the beam top on both sides of the prefabricated column is connected, and a single nut is used to fix the outer side of the symmetrical steel plate with the through hole provided on the second plate hoop, so that the second plate hoop does not slip and fits tightly with the column surface; The prefabricated column beam bottom main reinforcement is pre-embedded with connecting steel bars, which pass through the prefabricated column and the through holes on the steel plate close to the column side of the symmetrical steel plate connecting keys on both sides of the prefabricated column. The steel plate connecting keys are fixed to the column with nuts on the inner side of the steel plate, so that they will not fall off or slip and will fit tightly to the column surface.
6. A hybrid dry-type connection assembly integral concrete frame cross-shaped beam-column node according to claim 1 or 3, characterized in that: The plate hoops 1 and 2 and the main reinforcements at the bottom and top of the semi-prefabricated beam form a beam main reinforcement reinforced connection node, which can resist the deformation of the prefabricated column in the node area and enhance the shear resistance of the column; the formed beam-column dry connection node directly transmits force without grouting, improves the anchoring capacity of the beam main reinforcement and the ability to resist positive bending moment, and increases the bearing capacity of the beam-column node by 20%.
7. A cross-shaped beam-column node of a hybrid dry-type assembly integral concrete frame according to claim 5, characterized in that: The beam-column dry connection node transmits force directly without grouting, and plastering and leveling are performed at the bottom of the steel plate connection key to achieve anti-corrosion protection of the connection node; the plastering thickness should not exceed 35 mm.
8. The hybrid dry-type assembly integral concrete frame cross-shaped beam-column node according to claim 1, characterized in that: The main reinforcement at the bottom of the semi-prefabricated beam is provided with an overhanging section, and a trapezoidal notch engaged with the inverted corbel is reserved on the lower side. During installation, the slope surface of the trapezoidal notch is closely fitted with the slope surface of the inverted corbel of the prefabricated column.
9. A hybrid dry-type connection assembled monolithic concrete frame cross-shaped beam-column node according to claim 1, characterized in that: The through holes opened at the upper part of the prefabricated column node area and at the positions corresponding to the top reinforcements of the prefabricated beams are reserved during the prefabrication process in the factory.
10. The construction method of a cross-shaped beam-column node of a hybrid dry-type assembly integral concrete frame as claimed in claim 1, characterized in that: The method is implemented in the following steps: S1. Production of prefabricated components: Connect the steel plate connection key with the oblique reinforcement, and cast concrete as a whole to form an inverted corbel; connect the prefabricated column with the steel plate connection key, and connect the two ends of the steel plate connection key with steel plates to form a plate hoop of the same size as the column; open a through hole at the corresponding position of the main reinforcement at the bottom of the beam on the steel plate connection key and the prefabricated column, penetrate the steel plate with the through hole in the plate hoop, and set threaded sections at both ends of the steel bar, and fix it with single nuts on the steel plates on both sides; A threaded section is set at the end of the main reinforcement at the bottom of the semi-precast beam and passes through the steel plate connecting key away from the steel plate on the side of the column. The steel plate is clamped with nuts. The inner side of the steel plate is fixed with double nuts and the outer side is fixed with a single nut to prevent loosening and falling off. A second plate hoop is arranged on the outer side of the upper part of the prefabricated column node area, and a through hole is provided on the plate hoop steel plate at the position corresponding to the longitudinal force-bearing main reinforcement on the top of the beam. The main reinforcement on the upper side of the semi-prefabricated beam passes through the plate hoop and the column in sequence, and a single nut is used to connect the outer side of the steel plate with the through hole on the second plate hoop; the semi-prefabricated beam is provided with the main reinforcement and stirrups at the bottom of the beam, and a post-cast concrete superposition layer is reserved at the top of the beam, the stirrups extend from the top of the beam, and a trapezoidal notch is reserved on the lower side for engaging with the inverted corbel, and the main reinforcement at the bottom of the semi-prefabricated beam is provided with an overhanging section and a thread is provided; S2. Hoisting and placing of semi-precast beams: Pass the main reinforcement at the bottom of the beam through the holes reserved for the steel plate connection keys in the plate hoops, and use nuts to anchor the main reinforcement at the bottom of the beam and the main reinforcement that passes through the precast column; after the connection nuts are assembled, plaster and level the bottom opening of the steel plate connection keys to protect the steel bar connection nodes; the main reinforcement at the top of the beam passes through the semi-precast beam hoops to make the main reinforcement at the top of the beams on the left and right sides continuous; S3. Integral casting: Tie the top steel bars and node structural bars of the slab, integrally cast the floor slab and semi-precast beams, and then cast the concrete overlay layer to form an integrally assembled cross-shaped beam-column node.