A continuous joint structure for prefabricated assembled bridges and its construction method

Abstract

This invention discloses a continuous joint structure for prefabricated assembled bridges and its construction method, including prefabricated beams, a first connecting plate disposed in the installation slots of adjacent prefabricated beams, and U-shaped expansion joints. Both ends of the first connecting plate are spaced apart from the sidewalls of the installation slots to form interlocking joints. The expansion joints are arranged in an inverted U-shape within the interlocking joints. This invention utilizes the inverted U-shaped expansion joints; when minor displacement or deformation occurs between the prefabricated beams, the expansion joints are compressed, and energy is dissipated through the movement of the two arms of the expansion joints, thereby ensuring the stability of the prefabricated beams. The structure is simple and easy to install and disassemble. Furthermore, the first connecting plate ensures the continuity between the prefabricated beams. The GD elastic concrete connecting layer disposed on the connecting plate, in conjunction with the expansion and contraction of the expansion joints, does not exert a pulling effect on the adjacent asphalt layer, thus ensuring the stability of the surface asphalt concrete.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a prefabricated bridge continuous joint structure and its construction method. Background Technology

[0002] To accelerate the construction of bridges, especially viaducts, reduce the impact of construction on traffic and society, and improve project quality, prefabrication and assembly technology has been advocated and vigorously promoted. This new industrial approach not only offers significant advantages in construction speed but also greatly enhances quality. It presents bridge engineering as an industrial product to society, ensuring a structural integrity that requires no repair for a century.

[0003] Current bridge expansion joints or continuous joint structures are often complex, inconvenient to install and dismantle, and when in use, they often cause tensile damage to other pavement structures on the bridge deck. Their shock absorption and energy dissipation effects are limited. For example, CN110230256A includes a left bridge body, a right bridge body, and a waterproof strip. An expansion joint is left between the left and right bridge bodies. The waterproof strip includes a left connecting part for sealing connection to the left bridge body and a right connecting part for sealing connection to the right bridge body, as well as an intermediate part that connects to the left and right connecting parts respectively. The intermediate part bends downward to form a recessed part for filling the expansion joint. Its structure is complex and easily causes tensile damage to other pavement structures on the bridge deck. Its shock absorption and energy dissipation effects are limited.

[0004] To address the aforementioned problems, this invention provides a prefabricated assembled bridge continuous joint structure and its construction method, thereby solving the issues of complex expansion joint structures and poor energy dissipation performance in the past. Summary of the Invention

[0005] The purpose of this invention is to provide a prefabricated bridge continuous joint structure and its construction method, which facilitates installation and disassembly while improving energy efficiency.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A prefabricated bridge continuous joint structure includes a prefabricated beam with an installation groove at one end, a first connecting plate disposed in the installation groove of an adjacent prefabricated beam, and a U-shaped expansion joint. The two ends of the first connecting plate are spaced apart from the side wall of the installation groove to form an insertion joint. The expansion joint is arranged in an inverted U-shape in the insertion joint, and the two arms of the expansion joint abut against the side wall of the installation groove and the end of the first connecting plate, respectively.

[0008] Preferably, it further includes a connecting rod disposed within the precast beam, one end of which extends out of the sidewall of the mounting groove and connects to the expansion joint.

[0009] Preferably, the height of the telescopic component, the depth of the mounting groove, and the thickness of the first connecting plate are the same.

[0010] Preferably, the system further includes a second connecting plate, which covers the joint and is connected to the first connecting plate and the adjacent precast beam.

[0011] Preferably, the thickness of the second connecting plate is less than the thickness of the first connecting plate.

[0012] Preferably, it further includes a GD elastic concrete connecting layer covering the first connecting plate and the second connecting plate, wherein both ends of the GD elastic concrete connecting layer are respectively connected to the asphalt layer on the precast beam.

[0013] Preferably, an epoxy interface agent is applied between the GD elastic concrete connecting layer and the asphalt layer, and between the GD elastic concrete connecting layer and the precast beam.

[0014] A construction method for continuous joints in precast assembled bridges includes the following steps:

[0015] When prefabricating the beam, installation grooves are set on the upper surface of the areas at both ends of the prefabricated beam before the beam is installed;

[0016] First connecting plates are installed in the mounting slots at both ends of the beam and cover the beam joints;

[0017] Place an inverted U-shaped expansion joint inside the joint and cover the joint with the second connecting plate;

[0018] An asphalt layer is laid on the surface of the precast beam, and the position for the installation groove is reserved;

[0019] A GD elastic concrete connecting layer is poured above the installation groove, covering the first and second connecting plates and connecting them to the asphalt layer.

[0020] Preferably, an epoxy interface agent is applied to the ends of the asphalt layer before pouring the GD elastic concrete bonding layer.

[0021] Preferably, the length of the mounting groove is 20cm to 25cm and the depth is 2cm to 2.5cm.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] 1. This invention utilizes an inverted U-shaped expansion joint. When minor displacement or deformation occurs between precast beams, the expansion joint is compressed, and energy is dissipated through the movement of its two arms, thus ensuring the stability of the precast beams. The structure is simple and easy to install and disassemble. Furthermore, the first connecting plate ensures the continuity between precast beams. The GD elastic concrete connecting layer on the connecting plate, in conjunction with the expansion and contraction of the expansion joint, does not exert a pulling effect on adjacent asphalt layers, thereby ensuring the stability of the surface asphalt concrete.

[0024] 2. The present invention also includes a connecting rod disposed within the precast beam body, one end of which extends out of the side wall of the mounting groove and connects to the expansion joint; by setting the connecting rod, the stability of the expansion joint is ensured, and the deviation of the expansion joint is avoided from affecting its energy dissipation effect. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] The components are: 1. Asphalt layer; 2. Second connecting plate; 3. First connecting plate; 4. Expansion joint; 5. GD elastic concrete connecting layer; 6. Epoxy interface agent; 7. Connecting rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on 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.

[0029] The purpose of this invention is to provide a prefabricated bridge continuous joint structure and its construction method, which facilitates installation and disassembly while improving energy efficiency.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] refer to Figure 1A precast bridge continuous joint structure includes a precast beam with an installation groove at one end, a first connecting plate 3 disposed in the installation groove of an adjacent precast beam, and a U-shaped expansion joint 4. The two ends of the first connecting plate 3 are spaced apart from the sidewall of the installation groove to form an insertion joint. The expansion joint 4 is arranged in an inverted U-shape within the insertion joint, with its two arms abutting against the sidewall of the installation groove and the end of the first connecting plate 3, respectively. This invention utilizes the inverted U-shaped expansion joint 4. When minor displacement or deformation occurs between the precast beams, the expansion joint 4 is compressed, and energy is dissipated through the movement of its two arms, thus ensuring the stability of the precast beam. The structure is simple and easy to install and disassemble. Furthermore, the first connecting plate 3 ensures the continuity between the precast beams. The GD elastic concrete connecting layer 5 disposed on the connecting plate, in conjunction with the expansion and contraction of the expansion joint 4, does not exert a pulling effect on the adjacent asphalt layer 1, thereby ensuring the stability of the surface asphalt concrete.

[0032] refer to Figure 1 It also includes a connecting rod 7 installed in the precast beam body, one end of which extends out of the side wall of the mounting groove and connects to the expansion member 4; by setting the connecting rod 7, the stability of the expansion member 4 is ensured, and the deviation of the expansion member 4 is avoided from affecting its energy consumption effect.

[0033] Furthermore, the height of the expansion joint 4, the depth of the mounting groove, and the thickness of the first connecting plate are the same; this ensures that the expansion joint 4 is completely engaged within the joint and that no part protrudes from the mounting groove, thus avoiding any impact on subsequent installation.

[0034] refer to Figure 1 It also includes a second connecting plate 2, which covers the joint and is connected to the first connecting plate 3 and the adjacent precast beam respectively. The second connecting plate 2 covers the joint to prevent debris and concrete from falling into the joint and affecting the function of the expansion joint 4.

[0035] Furthermore, the thickness of the second connecting plate 2 is less than the thickness of the first connecting plate 3.

[0036] refer to Figure 1 It also includes a GD elastic concrete connecting layer 5 covering the first connecting plate 3 and the second connecting plate 2, with both ends of the GD elastic concrete connecting layer 5 connected to the asphalt layer 1 on the precast beam.

[0037] Furthermore, epoxy interface agent 6 is applied between the GD elastic concrete connecting layer 5 and the asphalt layer 1, as well as between the GD elastic concrete connecting layer 5 and the precast beam.

[0038] A construction method for continuous joints in precast assembled bridges includes the following steps:

[0039] During the precast beam construction, installation grooves are set on the upper surface of the areas at both ends of the precast beam before the beam is installed. First connecting plates 3 are placed in the installation grooves at both ends of the beam and cover the beam joint. Inverted U-shaped expansion joints 4 are placed in the joints and second connecting plates 2 are placed on the joints. An asphalt layer is laid on the surface of the precast beam and the position of the installation groove is reserved. A GD elastic concrete connecting layer 5 is poured above the installation groove, covering the first connecting plate 3 and the second connecting plate 2 and connecting it to the asphalt layer.

[0040] Furthermore, before pouring the GD elastic concrete bonding layer 5, an epoxy interface agent 6 is applied to the ends of the asphalt layer.

[0041] Furthermore, the length of the mounting groove is 20cm to 25cm, and the depth is 2cm to 2.5cm.

[0042] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0043] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for constructing a continuous joint of a precast assembly bridge, characterized by, The method comprises the following steps: setting installation grooves on the upper surfaces of the two end regions of the prefabricated beam body respectively after the prefabricated beam body is prefabricated and installing the beam body; Setting first connecting plates in the installation grooves at the two ends of the beam body and covering the beam joints; Placing inverted U-shaped expansion joints in the insertion joints and covering the insertion joints with second connecting plates; wherein the prefabricated assembled bridge continuous joint structure comprises prefabricated beam bodies provided with installation grooves at the ends, first connecting plates set in the installation grooves of adjacent prefabricated beam bodies, and U-shaped expansion joints, the two ends of the first connecting plates are spaced apart from the side walls of the installation grooves and form insertion joints, the expansion joints are arranged in the insertion joints in inverted U shapes, and the two arms of the expansion joints abut against the side walls of the installation grooves and the ends of the first connecting plates respectively; the structure further comprises second connecting plates, the second connecting plates cover the insertion joints, and the second connecting plates are connected with the first connecting plates and the adjacent prefabricated beam bodies respectively; Spreading an asphalt layer on the surface of the prefabricated beam body and reserving positions of the installation grooves; Pouring a GD elastic concrete connecting layer above the first connecting plates and the second connecting plates in the upper part of the installation grooves and connecting the GD elastic concrete connecting layer with the asphalt layer.

2. The method for constructing continuous joints of precast assembled bridges according to claim 1, characterized in that, Before pouring the GD elastic concrete connecting layer, an epoxy interface agent is applied to the ends of the asphalt layer.

3. The method of claim 1, wherein the method further comprises: The length of the installation groove is 20 cm to 25 cm, and the depth is 2 cm to 2.5 cm.

4. The method of claim 1, wherein the method further comprises: The structure further comprises connecting rods arranged in the prefabricated beam bodies, one end of each connecting rod extends out of the side wall of the installation groove and is connected with the expansion joint.

5. The method of claim 1, wherein the method further comprises: The height of the expansion joint, the depth of the installation groove, and the thickness of the first connecting plate are the same.

6. The method for constructing continuous joints of precast assembled bridges according to claim 5, characterized in that, The thickness of the second connecting plate is smaller than the thickness of the first connecting plate.

7. The method of claim 6, wherein the method further comprises: The structure further comprises a GD elastic concrete connecting layer covering the first connecting plates and the second connecting plates, and the two ends of the GD elastic concrete connecting layer are connected with the asphalt layer on the prefabricated beam body respectively.

8. The method of claim 7, wherein the method further comprises: Epoxy interface agents are applied between the GD elastic concrete connecting layer and the asphalt layer and between the GD elastic concrete connecting layer and the prefabricated beam body.

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