Connecting joint of HPC (High Performance Concrete) board and bearing steel truss

Abstract

The invention relates to the technical field of building construction, in particular to an HPC (High Performance Concrete) board and bearing steel truss connecting node which comprises a corner connector, the corner connector is of an L-shaped platy structure, the corner connector comprises a horizontal section and a vertical section, the horizontal section of the corner connector is connected with an HPC board, and the vertical section of the corner connector is connected to a keel; a plain head bolt is inserted into the horizontal section of the corner connector, the bottom end of the plain head bolt is sleeved and screwed with a locknut, and a plurality of hooks are fixed at the bottom end of the locknut; the connecting structure has the beneficial effects that a double-connecting structure of'hook pre-fixing and bolt fastening 'is adopted, the hook is fixedly welded with the HPC board structure net and is clamped with the corner connector, pre-positioning is realized, the bolt fastening is matched to ensure the connection reliability, and the problems of difficulty in mounting and aligning and infirmness in connection in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a connection node between an HPC board and a backing steel truss. Background Technology

[0002] With the rapid development of the prefabricated building industry, the combined application of low-carbon, high-efficiency, and high-performance building components has become an industry trend. HPC (High-Performance Concrete) panels, with their superior properties such as high strength, high durability, and high impermeability, are increasingly widely used in the exterior walls, interior walls, and floor slabs of prefabricated high-rise buildings. As a crucial load-bearing component in the building structure, the supporting steel truss must be reliably connected to the HPC panel to ensure the overall structural stability, load-bearing capacity, and seismic performance. The connection node, as the core component where the HPC panel and the supporting steel truss work together, directly affects the safety, construction efficiency, and service life of the building structure. Currently, the connection method between HPC panels and steel trusses in prefabricated buildings is gradually becoming a focus of industry attention, urgently requiring a connection node structure that balances connection reliability, ease of installation, and long-term durability.

[0003] The current mainstream methods for connecting HPC panels to steel trusses in the industry mainly include the following three categories: Direct welding connection: This method involves directly welding the pre-installed steel embedded parts of the HPC board to the keel of the supporting steel truss. This solution requires on-site welding operations. The high temperature generated during welding can easily cause a sudden rise in the local temperature of the HPC board, leading to problems such as concrete cracking and reduced strength. Furthermore, the welding quality is greatly affected by the skill level of the construction personnel, posing a risk of weld defects and making subsequent maintenance difficult.

[0004] Single bolt connection: This method uses bolts to pass through pre-drilled holes in the HPC board and fasten them to the steel truss frame. This type of connection requires precise pre-drilling of multiple holes in the HPC board, demanding high machining accuracy. Aligning the holes during construction is difficult, resulting in low installation efficiency. Furthermore, over long-term use, the bolts are susceptible to loosening due to vibration, and the lack of effective anti-loosening measures leads to insufficient connection stability.

[0005] Simple bracket connection: HPC panels are attached to the steel truss frame using simple metal brackets. This method has a simple structure, but the brackets have limited load-bearing capacity, only able to support the weight of the HPC panels themselves, and cannot withstand horizontal loads or seismic forces, resulting in poor seismic performance. Furthermore, the contact area between the brackets and the HPC panels and frame is small, leading to significant stress concentration and making them prone to fatigue damage and insufficient durability over long-term use.

[0006] The aforementioned existing technical solutions all have varying degrees of defects and cannot simultaneously meet the engineering requirements of connection firmness, installation convenience, seismic resistance, and durability, thus limiting the promotion and application of HPC panels and backed steel trusses in prefabricated high-rise buildings. Summary of the Invention

[0007] The purpose of this invention is to provide a connection node between an HPC board and a backing steel truss to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a connection node between an HPC board and a back steel truss, including an angle bracket, the angle bracket having an "L"-shaped plate structure, the angle bracket including a horizontal section and a vertical section, the horizontal section of the angle bracket connecting to the HPC board, and the vertical section of the angle bracket connecting to the keel; The horizontal section of the corner bracket is fitted with a plain head bolt, and the bottom end of the plain head bolt is fitted with a lock nut, and the bottom end of the lock nut is fixed with multiple hooks. The bottom surface of the anti-loosening nut has a reserved groove on the outer ring. Multiple inserts are movably inserted into the inner ring surface of the reserved groove. A collar is sleeved inside the reserved groove. The collar pushes the inserts into the slot one opened on the surface of the plain head bolt.

[0009] Preferably, the vertical section of the corner bracket has an elongated hole, the horizontal section of the corner bracket has a bolt hole, the shank of the plain head bolt passes through the bolt hole, and a metal washer is fitted on the shank of the plain head bolt, with the metal washer clamped between the top of the plain head bolt and the horizontal section of the corner bracket.

[0010] Preferably, a rubber washer is fixed to the top surface of the anti-loosening nut, the rubber washer is clamped between the top of the anti-loosening nut and the PHC plate, and an elastic rubber ring is fixed to the bottom of the anti-loosening nut on the inner ring surface. The elastic rubber ring is clamped between the shank bolt and the anti-loosening nut and undergoes elastic deformation.

[0011] Preferably, the reserved groove is an annular groove, and the inner annular surface of the reserved groove has multiple through holes, with each through hole corresponding to an insert block. The insert block is inserted into the through hole, and the length of the insert block is greater than the depth of the through hole.

[0012] Preferably, one end of the insert is fixed to the outer ring surface of the elastic rubber ring, and the other end of the insert has an inclined surface on the bottom surface. After the collar pushes the insert into the slot, the elastic rubber ring is partially stretched and deformed by the insert and clamped in the slot.

[0013] Preferably, the top surface of the reserved groove is fixed with two elastic hanging pieces. The elastic hanging pieces are arc-shaped pieces. The two elastic hanging pieces are symmetrically distributed about the inner ring of the anti-loosening nut. The bottom of the elastic hanging pieces is integrally formed with a retaining strip. The retaining strip is an arc strip with a right-angled trapezoidal end face. The retaining strip is inserted into the retaining groove two opened on the outer ring surface of the collar. The retaining groove two is an annular groove.

[0014] Preferably, the bottom end of the elastic tab is integrally formed with a paddle, the thickness of the paddle is less than the thickness of the clip, and the outer ring surface of the paddle and the outer ring surface of the clip are coplanar.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The HPC board and supporting steel truss connection node proposed in this invention adopts a dual connection structure of "hook pre-fixation + bolt tightening". The hook is welded and fixed to the HPC board structural mesh and snapped into the corner bracket to achieve pre-positioning. The bolt tightening ensures the reliability of the connection, solving the problems of difficult installation alignment and unstable connection in the prior art. The vertical section of the L-shaped corner bracket is provided with elongated holes to adjust the installation height, effectively compensating for installation errors during construction and improving construction adaptability. Key components such as corner brackets and keels are made of high-strength steel and treated with anti-corrosion. With the help of metal gaskets and anti-loosening nuts, the durability and anti-loosening performance of the node are significantly improved, and the service life is extended. Adjacent HPC boards are welded to the structural mesh through connectors to form an integrated load-bearing system, enhancing the node's resistance to lateral displacement and seismic performance, meeting the load-bearing requirements of high-rise buildings. The corner brackets are fixed to the supporting steel truss by welding, and the corner brackets are fixed to the HPC boards by connectors, balancing connection strength and installation convenience, and improving construction efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Sectional view of the structure at point AA; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 4 This is a schematic diagram of the anti-loosening nut structure of the present invention; Figure 5 This is a schematic diagram of the plain head bolt structure of the present invention.

[0017] In the diagram: Angle bracket 1, oblong hole 101, bolt hole 102, plain head bolt 2, metal washer 201, slot one 202, anti-loosening nut 3, rubber washer 301, reserved groove 302, elastic rubber ring 303, through hole 304, insert block 305, collar 4, slot two 401, elastic hanging piece 5, locking strip 501, lever 502, hook 6. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 5 The present invention provides a technical solution: a connection node between an HPC board and a back steel truss, including a corner bracket 1. The corner bracket 1 has an "L"-shaped plate structure and includes a horizontal section and a vertical section. The horizontal section of the corner bracket 1 is connected to the HPC board, and the vertical section of the corner bracket 1 is connected to the keel.

[0020] To fix the horizontal segment of corner code 1 to the PHC board, the following was proposed: The horizontal section of the corner bracket 1 is fitted with a plain head bolt 2, and the bottom end of the plain head bolt 2 is fitted with a lock nut 3. The bottom end of the lock nut 3 is fixed with multiple hooks 6. The vertical section of the corner bracket 1 has an elongated hole 101, and the horizontal section of the corner bracket 1 has a bolt hole 102. The rod of the plain head bolt 2 passes through the bolt hole 102, and a metal washer 201 is fitted on the rod of the plain head bolt 2. The metal washer 201 is clamped between the top end of the plain head bolt 2 and the horizontal section of the corner bracket 1. A rubber washer 301 is fixed on the top surface of the lock nut 3. The rubber washer 301 is clamped between the top end of the lock nut 3 and the PHC plate. An elastic rubber ring 303 is fixed on the inner ring surface of the bottom of the lock nut 3. The elastic rubber ring 303 is clamped between the rod of the plain head bolt 2 and the lock nut 3 and undergoes elastic deformation.

[0021] Angle bracket 1 is made of Q235B high-strength steel. After placing the horizontal section of angle bracket 1 on the PHC board, the plain head bolt 2 is passed through the bolt hole 102 and the PHC board. The anti-loosening nut 3 is then placed on the bottom end of the plain head bolt 2 and tightened. At this time, the metal washer 201 is clamped between the top of the plain head bolt 2 and the horizontal section of angle bracket 1, and the rubber washer 301 is clamped between the top of the anti-loosening nut 3 and the PHC board. The metal washer 201 and the rubber washer 301 work together to prevent the anti-loosening nut 3 from coming loose. Four curved hooks 6 are fixed on the surface of the anti-loosening nut 3. The hooks 6 are convenient for hanging with the structural mesh inside the HPC board.

[0022] To further enhance the anti-loosening effect of the anti-loosening nut 3 at the bottom of the plain head bolt 2, the following is proposed: The bottom surface of the anti-loosening nut 3 has a reserved groove 302 on the outer ring. Multiple inserts 305 are movably inserted into the inner ring surface of the reserved groove 302. A collar 4 is fitted inside the reserved groove 302, pushing the inserts 305 into the slot 202 on the surface of the plain head bolt 2. The reserved groove 302 is annular, and multiple through holes 304 are formed on the inner ring surface of the reserved groove 302. Each through hole 304 corresponds to one insert 305, and the insert 305 is inserted into the through hole 304, with the length of the insert 305 greater than the depth of the through hole 304. One end of the insert 305 is fixed to the outer ring surface of the elastic rubber ring 303, and the other end of the insert 305 has a bevel on its bottom surface. The collar 4 pushes the insert 305 into place. After the first slot 202, the elastic rubber ring 303 is partially stretched and deformed by the insert block 305 and clamped in the first slot 202; two elastic hanging pieces 5 are fixed on the top surface of the reserved slot 302. The elastic hanging pieces 5 are arc-shaped pieces. The two elastic hanging pieces 5 are symmetrically distributed about the inner ring of the anti-loosening nut 3. The bottom of the elastic hanging piece 5 is integrally formed with a retaining strip 501. The retaining strip 501 is an arc strip with a right-angled trapezoidal end face. The retaining strip 501 is inserted into the second slot 401 opened on the outer ring surface of the collar 4. The second slot 401 is an annular groove; the bottom end of the elastic hanging piece 5 is integrally formed with a lever 502. The thickness of the lever 502 is less than the thickness of the retaining strip 501, and the outer ring surface of the lever 502 and the outer ring surface of the retaining strip 501 are coplanar.

[0023] When the anti-loosening nut 3 is not installed on the plain head bolt 2, the collar 4 is not installed in the reserved groove 302. When the elastic rubber ring 303 is in the initial state, the end of the insert block 305 with the inclined surface extends into the reserved groove 302. After the anti-loosening nut 3 is screwed onto the bottom end of the plain head bolt 2 and locked, the insert block 305 corresponds to the first slot 202. At this time, the collar 4 is pushed into the reserved groove 302. The collar 4 pushes multiple insert blocks 305 into the corresponding through holes 304. At this time, the insert block 305 stretches the elastic rubber ring 303 and deforms before squeezing into the first slot 202. At this time, the locking strip 501 is locked in the second slot 401. In this way, the anti-loosening nut 3 and the plain head bolt 2 are connected by multiple insert blocks 305 to form an anti-loosening locking position. The locking strip 501, together with the elastic hanging piece 5, prevents the collar 4 from falling off, thereby realizing the anti-loosening reinforcement of the anti-loosening nut 3 at the bottom of the plain head bolt 2.

[0024] Instructions for the use of components such as angle brackets, plain head bolts, and lock nuts in the connection nodes between HPC plates and backing steel trusses: After placing the horizontal section of the corner bracket 1 on the HPC board, pass the plain head bolt 2 through the bolt hole 102 on the horizontal section of the corner bracket 1 and the HPC board. Place the lock nut 3 on the bottom of the plain head bolt 2 and tighten it. At this time, the metal washer 201 is placed on the shank of the plain head bolt 2 and clamped between the top of the plain head bolt 2 and the horizontal section of the corner bracket 1; the rubber washer 301 is clamped between the top of the lock nut 3 and the HPC board. The metal washer 201 and the rubber washer 301 together provide initial anti-loosening protection. When the lock nut 3 is not installed on the plain head bolt 2, the collar 4 is not installed in the reserved groove 302, the elastic rubber ring 303 is in its initial state, and the beveled end of the insert block 305 extends into the reserved groove 302. After screwing the lock nut 3 onto the bottom of the plain head bolt 2 and tightening it, align the insert block 305 with the slot 202. The collar 4 is pushed into the pre-reserved groove 302, and the collar 4 pushes multiple inserts 305 into the corresponding through holes 304. At this time, the inserts 305 stretch the elastic rubber ring 303 and deform before being squeezed into the first slot 202. At the same time, the retaining strip 501 is engaged in the second slot 401 opened on the outer ring surface of the collar 4, so that the anti-loosening nut 3 and the plain head bolt 2 are connected by multiple inserts 305 to form an anti-disengagement locking position. The retaining strip 501, together with the elastic hanging piece 5, prevents the collar 4 from falling off, thus completing the anti-loosening reinforcement of the anti-loosening nut 3 at the bottom of the plain head bolt 2.

[0025] If disassembly is required, the locking strip 501 can be disengaged from the second locking groove 401 by moving the lever 502, and the collar 4 can be removed. The elastic rubber ring 303 will return to its original shape, the insert block 305 will be removed from the first locking groove 202, and then the anti-loosening nut 3 can be unscrewed to remove the plain head bolt 2 and other related parts.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection node between an HPC board and a back steel truss, including a corner bracket (1), the corner bracket (1) having an "L" shaped plate structure, the corner bracket (1) including a horizontal section and a vertical section, the horizontal section of the corner bracket (1) connecting to the HPC board, and the vertical section of the corner bracket (1) connecting to the keel; Its features are: The horizontal section of the corner bracket (1) is fitted with a plain head bolt (2), and the bottom end of the plain head bolt (2) is fitted with a lock nut (3), and the bottom end of the lock nut (3) is fixed with multiple hooks (6). The bottom surface of the anti-loosening nut (3) has a reserved groove (302) on the outer ring. Multiple inserts (305) are movably inserted into the inner ring surface of the reserved groove (302). A collar (4) is sleeved inside the reserved groove (302). The collar (4) pushes the inserts (305) into the slot (202) opened on the surface of the plain head bolt (2).

2. The connection node between an HPC board and a backing steel truss according to claim 1, characterized in that: The vertical section of the corner bracket (1) has an elongated hole (101), and the horizontal section of the corner bracket (1) has a bolt hole (102). The rod of the plain head bolt (2) passes through the bolt hole (102), and a metal washer (201) is fitted on the rod of the plain head bolt (2). The metal washer (201) is clamped between the top of the plain head bolt (2) and the horizontal section of the corner bracket (1).

3. The connection node between an HPC board and a backing steel truss according to claim 1, characterized in that: The top surface of the anti-loosening nut (3) is fixed with a rubber gasket (301). The rubber gasket (301) is clamped between the top of the anti-loosening nut (3) and the PHC plate. The bottom of the anti-loosening nut (3) is fixed with an elastic rubber ring (303) on the inner ring surface. The elastic rubber ring (303) is clamped between the rod of the plain head bolt (2) and the anti-loosening nut (3) and undergoes elastic deformation.

4. The connection node between an HPC board and a backing steel truss according to claim 1, characterized in that: The reserved groove (302) is an annular groove. Multiple through holes (304) are provided on the inner annular surface of the reserved groove (302). The through holes (304) and the inserts (305) correspond one-to-one. The inserts (305) are inserted into the through holes (304), and the length of the inserts (305) is greater than the depth of the through holes (304).

5. The connection node between an HPC board and a backing steel truss according to claim 4, characterized in that: One end of the insert (305) is fixed on the outer ring surface of the elastic rubber ring (303), and the other end of the insert (305) has an inclined surface on the bottom surface. After the collar (4) pushes the insert (305) into the slot (202), a part of the elastic rubber ring (303) is stretched and deformed by the insert (305) and clamped in the slot (202).

6. The connection node between an HPC board and a backing steel truss according to claim 1, characterized in that: The top surface of the reserved groove (302) is fixed with two elastic hanging pieces (5). The elastic hanging pieces (5) are arc-shaped pieces. The two elastic hanging pieces (5) are symmetrically distributed about the inner ring of the anti-loosening nut (3). The bottom of the elastic hanging piece (5) is integrally formed with a retaining strip (501). The retaining strip (501) is an arc strip with a right-angled trapezoidal end face. The retaining strip (501) is inserted into the retaining groove two (401) opened on the outer ring surface of the collar (4). The retaining groove two (401) is an annular groove.

7. The connection node between an HPC board and a backing steel truss according to claim 6, characterized in that: The bottom end of the elastic hanging piece (5) is integrally formed with a paddle (502). The thickness of the paddle (502) is less than the thickness of the clip (501), and the outer ring surface of the paddle (502) and the outer ring surface of the clip (501) are coplanar.

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