Detachable H-shaped steel shear connector for steel-concrete composite beam

Abstract

The invention belongs to the technical field of bridge engineering, and particularly relates to a detachable H-shaped steel shear connector for a steel-concrete composite beam, the detachable H-shaped steel shear connector comprises a steel beam and a prefabricated bridge deck arranged on the upper surface of the steel beam, a connector for connecting the steel beam is pre-buried in the prefabricated bridge deck, and the bottom end face of the connector abuts against the surface of the steel beam. A plurality of studs vertically arranged in the prefabricated bridge deck slab are arrayed on the surface of the connecting piece, each stud is fixedly connected with the connecting piece, one end of each stud is provided with a thread, and the end with the thread sequentially penetrates through the connecting piece and the steel beam and then is connected with a nut; by the adoption of the technical scheme, on the premise that the mechanical property of the concrete bridge deck and the steel beam during connection is guaranteed, the problems that on-site disassembly and assembly of the concrete bridge deck and the steel beam are difficult, and the repair period is long can be effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a detachable H-shaped steel shear connector for a steel-concrete composite beam. Background Art

[0002] As an important component of steel-concrete composite beams, shear connectors can effectively connect concrete slabs and steel beams, giving full play to the compressive properties of concrete and the tensile properties of steel. In addition to transmitting the longitudinal shear force between the concrete slab and the steel beam, the shear connector also prevents the vertical separation of the concrete slab and the steel beam. Therefore, the mechanical properties of the shear connector play a decisive role in the overall performance of the steel-concrete composite beam. With the increase in the service life of the bridge structure, the steel-concrete composite beam faces the dual test of bridge deck pavement wear and steel beam fatigue cracking, which seriously affects the normal use of the bridge structure. During the life cycle of the bridge, the removal and replacement of steel-concrete composite beams is inevitable. Traditional steel-concrete composite beams are often connected by welding rivets, without considering the replaceability of the composite structure. In recent years, many bridges have carried out the removal and replacement of bridge decks. However, these bridges are difficult to dismantle on site, and the bridge deck repair period is long, which has a great impact on the surrounding traffic.

[0003] To this end, a detachable H-shaped steel shear connector for steel-concrete composite beams is proposed. Under the premise of ensuring the mechanical properties of the concrete bridge deck when connected to the steel beam, it can effectively improve the efficiency of rapid disassembly and replacement between the two, facilitate construction site operations, speed up bridge repair, and ensure the quality of bridge construction. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a detachable H-shaped steel shear connector for steel-concrete composite beams, which can effectively solve the problems of difficult on-site disassembly and assembly and long repair period of the two while ensuring the mechanical properties of the concrete bridge deck and the steel beam when connected.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A detachable H-shaped steel shear connector for a steel-concrete composite beam comprises a steel beam and a prefabricated bridge deck arranged on the upper surface of the steel beam, wherein a connector for connecting the steel beam is pre-embedded inside the prefabricated bridge deck, and the bottom end surface of the connector abuts against the surface of the steel beam, and a surface array of the connector has a plurality of bolts vertically arranged in the prefabricated bridge deck, wherein each of the bolts is fixedly connected to the connector, and one end of each bolt is provided with a thread, and the end with the thread passes through the connector and the steel beam in turn and is connected to a nut, and each of the nuts is threadedly connected to the bolt and the prefabricated bridge deck and the steel beam are fixedly connected together through the connector.

[0007] Furthermore, the prefabricated bridge deck is embedded with a plurality of transverse steel bars arranged along its length direction and a plurality of stirrups surrounding each transverse steel bar, each of the stirrups is arranged at intervals along the length direction of the prefabricated bridge deck, a plurality of connecting members are provided, and they are evenly spaced between any two adjacent stirrups along the length direction of the prefabricated bridge deck, a reinforcement member is fixedly connected between each of the connecting members and the adjacent transverse steel bar, and the reinforcement member is embedded in the prefabricated bridge deck.

[0008] Furthermore, the connecting members are all "H"-shaped, and the two horizontal end surfaces of the connecting members are arranged up and down, and each of the bolts is arranged between the two horizontal end surfaces of the connecting member.

[0009] Furthermore, a horizontally placed steel plate is provided on the upper surface of each of the connecting members, and the steel plate is fixedly connected to the corresponding reinforcement member, and the steel plate is fixedly connected to the connecting member.

[0010] Furthermore, the surface of each bolt is sleeved with an anti-loosening washer located between the nut and the steel beam.

[0011] The beneficial effects of the present invention are:

[0012] 1. The present invention embeds an "H"-shaped connector in the prefabricated bridge deck and realizes the connection between the prefabricated bridge deck and the steel beam by tightening the nut, thereby solving the problem of the difficulty in dismantling the traditional steel-concrete composite beam bridge deck, realizing the rapid disassembly and replacement of the prefabricated bridge deck, and the steel beam and the detachable "H"-shaped steel connector are integrally prefabricated. After the prefabrication is completed, they are disassembled by screwing the nut and transported to the construction site for assembly. The prefabrication assembly has high precision and the on-site assembly operation is simple and feasible;

[0013] 2. The connectors are arranged symmetrically along the axis of the steel beam, which solves the problem of inconsistent concrete stress caused by unidirectional force on traditional channel steel shear keys. The arrangement is reasonable, the force performance is good, the structure is safe and reliable, the force transmission path is clear, and the material is fully utilized. The connectors and steel beams are connected by bolts. The steel web of the "H"-shaped connector mainly bears the shear force. The "H"-shaped connector and the reinforcement can prevent the precast bridge deck and the steel beam from separating, further strengthening the connection between the connector and the precast concrete, and ensuring the overall force stability between the steel beam and the precast bridge deck.

[0014] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0016] Figure 1 Schematic diagram of the connection structure between the prefabricated bridge deck and the steel beam of the present invention Figure 1 ;

[0017] Figure 2 Schematic diagram of the connection structure between the prefabricated bridge deck and the steel beam of the present invention Figure 2 ;

[0018] Figure 3 It is a side view of the connection between the prefabricated bridge deck and the steel beam of the present invention;

[0019] Figure 4 for Figure 1 The enlarged schematic diagram at A in the middle;

[0020] Figure 5 It is a schematic diagram of the connection structure between the connecting member and the reinforcing member of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the connecting piece and the bolt of the present invention;

[0022] Figure 7 This is a schematic diagram of the placement of the connecting member in the second embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the structure of the connecting piece in the second embodiment of the present invention.

[0024] The following are marked in the accompanying drawings:

[0025] 1 steel beam, 2 precast bridge deck, 3 connector, 4 stud, 5 transverse reinforcement, 6 stirrups, 7 reinforcement, 701 connecting block, 702 connecting arm, 8 steel plate. DETAILED DESCRIPTION

[0026] like Figure 1 to Figure 6 As shown,

[0027] Embodiment 1:

[0028] A detachable H-shaped steel shear connector for a steel-concrete composite beam comprises a steel beam 1 and a prefabricated bridge deck 2 arranged on the upper surface of the steel beam 1, wherein the steel beam 1 is an H-shaped steel main beam, and the H-shaped steel is Q345 hot-rolled H-shaped steel. A connector 3 for connecting the steel beam 1 is embedded in the interior of the prefabricated bridge deck 2, and the bottom end surface of the connector 3 is located outside the prefabricated bridge deck 2 and abuts against the surface of the steel beam 1. The surface of each of the connectors 3 is arrayed with a plurality of bolts 4 vertically arranged in the prefabricated bridge deck 2, and each bolt 4 has a cylindrical head and a bolt The bolt body is composed of a bolt body, and the diameter of the head is larger than that of the bolt body, wherein each of the bolts 4 is welded and fixed to the connecting piece 3, and one end of each bolt 4 is provided with a thread, and the end with the thread passes through the connecting piece 3 and the steel beam 1 in sequence and is connected with a nut, each of the nuts is threadedly connected to the bolt 4 and fixes the prefabricated bridge deck 2 and the steel beam 1 together through the connecting piece 3, and when the prefabricated bridge deck 2 and the steel beam 1 are fixed together, the center of the connecting piece 3 and the center line of the length direction of the steel beam 1 are on the same vertical line; wherein, combined with Figure 6 As shown, the diameter of the exposed portion of the bolt 4 under the connecting member 3 is larger than the diameter of the threaded portion, and the connection between the connecting member 3 and the steel beam 1 can be achieved by simply tightening the nut at the construction site.

[0029] As shown in the figure, the prefabricated bridge deck 2 is transported to the construction site for installation after being manufactured in the factory. The connectors 3 and the bolts 4 are pre-buried in the prefabricated bridge deck 2 (the placement position is as shown in FIG. Figure 4 As shown in the figure, the surface of the steel beam 1 is pre-opened with a plurality of through holes for the bolts 4 to pass through. When installing the prefabricated bridge deck 2, it is hoisted above the steel beam 1, and after the position of each bolt 4 corresponds to the through hole opened on the surface of the steel beam 1 one by one, the prefabricated bridge deck 2 can be lowered. At this time, the threaded end of each bolt 4 passes through the through hole, and then the nut is threadedly connected with the bolt 4, and the prefabricated bridge deck 2 and the steel beam 1 are fixedly connected, which effectively improves the disassembly and assembly efficiency between the prefabricated bridge deck 2 and the steel beam 1, and the disassembly and assembly are simple, and the operation is convenient and quick. Since the connecting piece 3 is pre-buried in the prefabricated bridge deck 2, the bolt 4 passes through The connecting piece 3 and the steel beam 1 are connected with nuts, and the steel beam 1 and the precast bridge deck 2 can be formed into a whole through the connecting piece 3, and a plurality of vertical studs 4 can act as shear transmission studs, effectively enhancing the shear strength between the steel beam 1 and the precast bridge deck 2. When the structure is subjected to stress, the studs 4 can effectively transmit the shear force and prevent relative sliding between the steel beam 1 and the precast bridge deck 2, thereby improving the stability of the entire structure. It can also increase the connection stiffness between the steel beam 1 and the precast bridge deck 2, so that the structure can work better together and reduce deformation when subjected to stress, which is of great significance for improving the overall stiffness and bearing capacity of the structure.

[0030] In this embodiment, the prefabricated bridge deck 2 is pre-embedded with a plurality of transverse steel bars 5 arranged along its length direction and a plurality of stirrups 6 surrounding each transverse steel bar 5, each of the stirrups 6 is arranged at intervals along the length direction of the prefabricated bridge deck 2, the connecting member 3 is provided with a plurality of pieces, and is evenly spaced between any two adjacent stirrups 6 along the length direction of the prefabricated bridge deck 2, and a reinforcement member 7 is welded and fixedly connected between each of the connecting members 3 and the adjacent transverse steel bars 5, and the reinforcement member 7 is pre-embedded in the prefabricated bridge deck 2, wherein the reinforcement member 7 includes a connecting block 701 sleeved on the outer surface of the transverse steel bar 5 and a connecting arm 702 welded to the outer surface of the connecting block 701, the connecting block 701 is semicircular and welded to the transverse steel bar 5, and the reinforcement member 7 is provided with two pieces, and is symmetrically arranged about the vertical axis of the steel beam 1.

[0031] As shown in the figure, the arrangement of transverse steel bars 5 and stirrups 6 can enhance the overall stability of the precast bridge deck 2, and each connector 3 is arranged between two adjacent stirrups 6, and a reinforcement 7 is also connected between the connector 3 and the transverse steel bars 5, which can further enhance the connection stability and integrity between the connector 3 and the precast bridge deck 2, thereby indirectly improving the connection strength between the precast bridge deck 2 and the steel beam 1, effectively ensuring the structural stability when subjected to force, enabling the precast bridge deck 2 and the steel beam 1 to better withstand loads and better achieve collaborative work.

[0032] In this embodiment, the connecting members 3 are all "H"-shaped, and the two horizontal end surfaces of the connecting members 3 are arranged up and down, and each of the bolts 4 is arranged between the two horizontal end surfaces of the connecting member 3.

[0033] As shown in the figure, the H-shaped connector 3 can better transfer the vertical load on the precast bridge deck 2 and transfer it to the steel beam 1, and the H-shaped connector 3 can also effectively improve the tightness of the precast bridge deck 2 when connected to it, and can better transfer the force on the precast bridge deck 2 when loaded through the connector 3, thereby improving the overall force stability.

[0034] In this embodiment, a horizontally placed steel plate 8 is provided on the upper surface of each of the connecting members 3 . The steel plate 8 is fixed to the corresponding reinforcing member 7 by welding, and the steel plate 8 is also fixed to the connecting member 3 by welding.

[0035] As shown in the figure, when making the prefabricated bridge deck 2, the connecting member 3 is first placed at the specified position, and then the reinforcement 7 is horizontally placed on the upper surface of the connecting member 3, and the two connecting blocks 701 of the reinforcement 7 are coaxially sleeved on the outer surfaces of the corresponding two transverse steel bars 5, and the connecting blocks 701 and the transverse steel bars 5 are welded and fixed to further strengthen the connection tightness between the connecting member 3 and the prefabricated bridge deck 2.

[0036] In this embodiment, the surface of each of the bolts 4 is provided with an anti-loosening washer (the anti-loosening washer is not shown in the figure) located between the nut and the steel beam 1, which can effectively prevent the nut from loosening and ensure the stability of the prefabricated bridge deck 2 and the steel beam 1 during long-term connection.

[0037] Embodiment 2:

[0038] Combination Figure 7-Figure 8 As shown, the difference between this embodiment and the first embodiment is that the direction in which the "H"-shaped connector 3 is arranged in the prefabricated bridge deck 2 is different. In this embodiment, the axes of the connector 3 and the length direction of the steel beam 1 are all in the same vertical plane. The advantage of such an arrangement is that it can facilitate the construction personnel to install the connector 3 while also improving the connection stability between the prefabricated bridge deck 2 and the steel beam 1.

[0039] And, combined with Figure 7 As shown, the size of the upper flange plate of the "H"-shaped connector 3 can be appropriately adjusted and optimized according to the reinforcement and force requirements of the prefabricated bridge deck 2 in the actual project. Under the premise of ensuring the structural force performance and disassembly, the installation difficulties caused by size mismatch are reduced, and the assembly efficiency at the construction site is improved; considering that the flange size of the "H"-shaped connector 3 is relatively large, in actual construction, it cannot meet the requirements of the bridge deck reinforcement spacing. In order to take into account the construction needs of on-site prefabrication and assembly, the size of the upper flange needs to be reduced.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A detachable H-shaped steel shear connector for a steel-concrete composite beam, comprising a steel beam (1) and a prefabricated bridge deck (2) arranged on the upper surface of the steel beam (1), characterized in that: A connector (3) for connecting the steel beam (1) is embedded inside the prefabricated bridge deck (2), and the bottom end surface of the connector (3) abuts against the surface of the steel beam (1). The surface array of the connector (3) has a plurality of bolts (4) vertically arranged inside the prefabricated bridge deck (2), wherein each of the bolts (4) is fixedly connected to the connector (3), and one end of each bolt (4) is provided with a thread, and the end with the thread passes through the connector (3) and the steel beam (1) in turn and is connected to a nut, and each of the nuts is threadedly connected to the bolt (4) and fixedly connects the prefabricated bridge deck (2) and the steel beam (1) together through the connector (3).

2. The detachable H-shaped steel shear connector for a steel-concrete composite beam according to claim 1, characterized in that: The prefabricated bridge deck (2) is pre-embedded with a plurality of transverse steel bars (5) arranged along its length direction and a plurality of stirrups (6) surrounding each transverse steel bar (5), each of the stirrups (6) being arranged at intervals along the length direction of the prefabricated bridge deck (2), a plurality of connecting members (3) being arranged evenly at intervals between any two adjacent stirrups (6) along the length direction of the prefabricated bridge deck (2), a reinforcing member (7) being fixedly connected between each connecting member (3) and the adjacent transverse steel bar (5), and the reinforcing member (7) being pre-embedded in the prefabricated bridge deck (2).

3. The detachable H-shaped steel shear connector for a steel-concrete composite beam according to claim 2, characterized in that: The connecting members (3) are all in an "H" shape, and the two horizontal end surfaces of the connecting members (3) are arranged vertically, and each of the bolts (4) is arranged between the two horizontal end surfaces of the connecting member (3).

4. The detachable H-shaped steel shear connector for a steel-concrete composite beam according to claim 3, characterized in that: The upper surface of each of the connecting members (3) is provided with a horizontally placed steel plate (8), the steel plate (8) is fixedly connected to the corresponding reinforcing member (7), and the steel plate (8) is fixedly connected to the connecting member (3).

5. The detachable H-shaped steel shear connector for a steel-concrete composite beam according to claim 4, characterized in that: The surface of each bolt (4) is sleeved with an anti-loosening washer located between the nut and the steel beam (1).

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