Self-locking connection structure for composite girder bridge deck and construction method thereof

Abstract

The present invention discloses a self-locking connection structure for a composite girder bridge deck and its construction method, belonging to the technical field of bridge deck construction. The connection structure includes two butt-jointed bridge decks penetrated by post-tensioned prestressing tendons. At the butt-jointed ends of the two bridge decks, there are two upper and lower rows of parallel self-locking connectors arranged along the width direction and including a number of oppositely paired anchor locks for connection. And between the two upper and lower rows of self-locking connectors, there are end shear blocks and end shear grooves that extend along the width direction and match each other oppositely. The present invention is applicable to rapid bridge erection, can effectively improve the assembly efficiency of precast bridge decks, and realizes no casting, no bolts, no welding on-site for assembled bridge decks, continuous longitudinal steel bars, not easy to crack in the joint area of the bridge deck, and has a certain bending and shear bearing capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge deck construction, and particularly relates to a self-locking connection structure for a composite beam bridge deck and a construction method thereof. Background Art

[0002] At present, the connection methods of precast bridge decks of assembled composite bridges at home and abroad are mainly overlapping wet joints with circular steel bars and overlapping wet joints with anchor plate steel bars. The reserved steel bars are prone to bending deformation and rust defects during transportation and hoisting. The formwork suspension in the on-site joint area is cumbersome, and the on-site pouring volume is large, which are not conducive to improving the assembly efficiency. Moreover, it is extremely difficult to achieve continuous force transmission of longitudinal steel bars with the use of dry joints at present, and it is difficult to ensure the anti-cracking performance of the joint interface. Summary of the Invention

[0003] The purpose of the invention is to overcome the deficiencies in the prior art, and provide a self-locking connection structure for a composite beam bridge deck and a construction method thereof, which can effectively improve the assembly efficiency of precast bridge decks, and realize the connection of longitudinal steel bars without casting, bolts and welding on-site for assembled bridge decks.

[0004] To achieve the above purpose, the invention is implemented by the following technical solutions:

[0005] In a first aspect, the invention provides a self-locking connection structure for a composite beam bridge deck, which includes two butt-jointed bridge decks penetrated by post-tensioned tendons. At the butt ends of the two bridge decks, there are two upper and lower rows of parallel self-locking connectors including several pairs of oppositely arranged anchor locks along the width direction, and between the two upper and lower rows of self-locking connectors, there are end shear blocks and end shear grooves extending along the width direction and matching with each other in an opposite direction.

[0006] Further, one end of the self-locking connector is fixedly connected to the internal longitudinal tensile steel bar of the bridge deck through a straight thread sleeve joint, and the other end is configured with a top buckle cone protruding from the end of the bridge deck, a top buckle groove recessed in the end of the bridge deck, and a rotary buckle arranged at the center of the adjacent surfaces of the button cone and the top buckle groove. The rotary buckle is configured to lock the top buckle cone inserted into the top buckle groove.

[0007] Further, the rotary buckle includes a semi-circular groove, a semi-cylindrical shaft and a semi-circular rotary buckle;

[0008] The semi-circular groove is opened at the center of the adjacent surfaces of the button cone and the top buckle groove, and the straight edge opening of the semi-circular groove is flush with the adjacent surface. The semi-cylindrical shaft is arranged concentrically with the semi-circular groove, and the straight side surface of the semi-cylindrical shaft is flush with the straight edge opening of the semi-circular groove. The semi-circular rotary buckle is rotatably arranged in the semi-circular groove around the semi-cylindrical shaft and a part of it that can self-reset protrudes into the top buckle groove.

[0009] Further, a spring slot for coaxial rotation is formed in the semi-circular rotary buckle, and the spring slot is sleeved on a spring top block fixed in the semi-circular slot. The spring slot is used for accommodating a compression spring. One end of the compression spring is fixedly connected to the spring top block, and the other end is fixedly connected to the inner end of the spring slot on the side close to the top buckle slot.

[0010] Further, the same center of the semi-circular slot, the semi-circular rotary buckle, and the semi-cylindrical shaft is located at the intersection between the opening end face of the top buckle slot and the adjacent face of the nail buckle cone head.

[0011] Further, the spring slot is configured as a 1 / 4 circular arc and is symmetrically arranged with respect to the central axis of the semi-circular rotary buckle.

[0012] Further, the self-locking connector includes an upper half cover and a lower half cover clamped and connected up and down by a plurality of screws. The upper half cover and the lower half cover jointly form the top buckle cone head, the top buckle slot, and clamp the rotary buckle member.

[0013] On the other hand, the present invention also provides a construction method for the self-locking connection structure of the combined beam bridge deck according to any one of the combinations in the first aspect, including the following method steps:

[0014] A plurality of corresponding self-locking connectors are fixedly arranged at the ends of the bridge decks facing each other. Among them, the part of the semi-circular rotary buckle of the self-locking connector that rotates and self-resets around the semi-cylindrical shaft protrudes and extends into the top buckle slot;

[0015] Bring the bridge decks facing each other closer, and make the end shear block of one bridge deck match and dock with the end shear groove of the other bridge deck. At the same time, make a plurality of corresponding self-locking connectors in two parallel rows on the upper and lower sides dock with each other. Among them, during the docking process of the self-locking connectors, the top buckle cone head of one bridge deck approaches and obliquely presses the semi-circular rotary buckle in the corresponding top buckle slot on the other bridge deck, so that the spring top block and the spring slot jointly tighten the compression spring, and make the semi-circular rotary buckle completely retract into the semi-circular slot;

[0016] When the top buckle cone head is completely inserted into the top buckle slot, the semi-circular slots of the two docked bridge decks are concentrically buckled into a circular slot on the left and right. At the same time, the top buckle cone head releases the extrusion on the semi-circular rotary buckle, and the semi-circular rotary buckle is self-reset and inserted into the semi-circular slot of the top buckle cone head of the docked bridge deck under the pushing of the compression spring to realize the anchor lock connection of the self-locking connector;

[0017] Pass a prestressed tendon through the docked bridge deck and tension the prestress.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention:

[0019] The self-locking connection structure of the composite girder bridge deck provided by the present invention adopts two rows of parallel self-locking connectors arranged in the width direction, including several pairs of oppositely facing anchor locks, as well as end shear blocks and end shear grooves that are oppositely matched and buckled, which can effectively improve the assembly efficiency of precast bridge decks, is suitable for rapid bridge erection, and realizes the connection of longitudinal steel bars without casting, bolts, or welding on-site for prefabricated bridge decks. The joint area of the bridge deck is not prone to cracking and has a certain bending and shear bearing capacity. Description of the Drawings

[0020] Figure 1 Fig. is a top view of a self-locking connection structure of a composite girder bridge deck according to an embodiment of the present invention;

[0021] Figure 2 Fig. is a top view cross-sectional view of a self-locking connector according to an embodiment of the present invention;

[0022] Figure 3 Fig. is a front view of a self-locking connection structure of a composite girder bridge deck according to an embodiment of the present invention;

[0023] Figure 4 Fig. is a right view cross-sectional view of a self-locking connector according to an embodiment of the present invention;

[0024] Figure 5 Fig. is a front view cross-sectional view of a self-locking connector according to an embodiment of the present invention;

[0025] Figure 6 Fig. is a front view of a self-locking connector according to an embodiment of the present invention;

[0026] In the figure:

[0027] 1, bridge deck; 2, self-locking connector; 3, end shear block; 4, end shear groove; 5, longitudinal tensile reinforcement; 6, straight thread sleeve joint; 7, top snap cone head; 8, top snap groove; 9, rotating snap member; 10, semi-circular groove; 11, semi-cylindrical shaft; 12, semi-circular rotating snap; 13, arc-shaped spring groove; 14, spring top block; 15, compression spring; 16, upper half cover; 17, lower half cover; 18, screw; 19, prestressed tendon. Detailed Embodiment

[0028] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0031] As Figure 1 and Figure 3 shown, in the embodiment of the present invention, a dry connection structure of a self-locking bridge deck 1 is provided. The connection structure includes two butt-jointed bridge decks 1 penetrated by post-tensioned prestressing tendons 19. At the butt-jointed ends of the two bridge decks 1, there are two rows of parallel self-locking connectors 2 arranged vertically and horizontally and including several pairs of mutually facing and anchor-locked connections, and between the two rows of self-locking connectors 2, there are end shear blocks 3 and end shear grooves 4 that extend in the width direction and are mutually matched and buckled.

[0032] As Figure 2 、 Figure 4 、 Figure 5 and Figure 6 shown, one end of the self-locking connector 2 is fixedly connected to the internal longitudinal tension reinforcement 5 of the bridge deck 1 through a straight thread sleeve joint 6, and the other end is provided with a top buckle cone head 7 protruding from the end of the bridge deck 1, a top buckle card slot 8 recessed in the end of the bridge deck 1, and a rotary buckle 12 rotary buckle member 9 provided at the center of the adjacent surfaces of the button cone head and the top buckle card slot 8. The rotary buckle 12 rotary buckle member 9 is configured to lock the buckle into the top buckle cone head 7 in the top buckle card slot 8.

[0033] In this embodiment, the rotary snap 12 of the rotary snap 12 member 9 includes a semi-circular card slot 10, a semi-cylindrical shaft 11, and a semi-circular rotary snap 12.

[0034] Specifically, the semi-circular card slot 10 is opened at the center of the adjacent surface of the buttoning cone head and the top button card slot 8, and the straight-edge opening of the semi-circular card slot 10 is flush with the adjacent surface. The semi-cylindrical shaft 11 is arranged concentrically with the semi-circular card slot 10, and the straight-edge side surface of the semi-cylindrical shaft 11 is flush with the straight-edge opening of the semi-circular card slot 10. The semi-circular rotary snap 12 is rotatably arranged in the semi-circular card slot 10 around the semi-cylindrical shaft 11 and a part of it that can self-reset protrudes into the top button card slot 8.

[0035] A spring card slot 13 that rotates coaxially is opened in the semi-circular rotary snap 12, and it is sleeved on a spring top block 14 fixed in the semi-circular card slot 10. The spring card slot 13 is used to accommodate and arrange a compression spring 15. One end of the compression spring 15 is fixedly connected to the spring top block 14, and the other end is fixedly connected to the inner end of the spring card slot 13 on the side close to the top button card slot 8.

[0036] In order to better achieve self-locking connection, the same center of the semi-circular card slot 10, the semi-circular rotary snap 12, and the semi-cylindrical shaft 11 is located at the intersection between the opening end face of the top button card slot 8 and the adjacent surface of the buttoning cone head. So that when the self-locking connector 2 is lock-connected, the semi-circular card slots 10 in the pair of self-locking connectors 2 respectively arranged on the two bridge decks 1 completely cooperate to form a concentric circular groove. Thus, the semi-circular rotary snap 12 that is squeezed and contracted by the buttoning cone head 7 protrudes outward under the action of the compression spring 15 and extends into the semi-circular card slot 10 of another matching self-locking connector 2, thereby realizing automatic reset and lock connection.

[0037] The semi-circular rotary snap 12 has a certain thickness, and the spring card slot 13 can be opened on one side of the semi-circular rotary snap 12 or throughly opened. In order to obtain better spring compression and reset operations, the spring card slot 13 is configured as a 1 / 4 circular arc and is symmetrically arranged with respect to the central axis of the semi-circular rotary snap 12.

[0038] In some embodiments, for the convenience of production and assembly, the self-locking connector 2 includes an upper half cover 16 and a lower half cover 17 that are clamped and connected up and down by a number of embedded or edge-connected self-tapping screws 18. The upper half cover 16 and the lower half cover 17 jointly enclose the buttoning cone head 7, the top button card slot 8, and the clamping rotary snap 12 of the rotary snap 12 member 9.

[0039] Among them, on the opposite surfaces of the upper half cover 16 and the lower half cover 17, semi-circular card slots 10 and top button card slots 8 with half the space size are respectively opened, and slot holes for placing both ends of the semi-cylindrical shaft 11 are respectively left.

[0040] In this embodiment, trapezoidal concrete end shear blocks 3 and end shear grooves 4 are provided at the ends of two opposite precast bridge decks 1 to resist the vertical shear force of the joint surface and improve the shear bearing capacity of the dry joint of the precast slabs.

[0041] Prestressed ducts are reserved at the neutral axis of the bridge deck 1. After a certain number of precast bridge decks 1 are erected, prestressing tendons 19 can be threaded through and prestressed. Under the action of the prestress of the bridge deck 1, its initial crack resistance can be effectively improved.

[0042] The self-locking dry connection method provided by the present invention overcomes the problems of poor continuity of longitudinal reinforcement force transmission at dry joints and low crack resistance at the joint interface, and can achieve no casting, no bolts, no welding, continuous longitudinal reinforcement, and strong crack resistance can be achieved through the application of prestress.

[0043] On the other hand, the embodiment of the present invention also provides a construction method based on the above self-locking dry connection structure of the bridge deck 1, including the following method steps:

[0044] A number of corresponding self-locking connectors 2 are fixedly arranged at the ends of the opposite bridge decks 1 to be butted. Among them, the part of the semi-circular rotating buckle 12 of the self-locking connector 2 that rotates and resets itself around the semi-cylindrical shaft 11 protrudes into the top buckle slot 8;

[0045] Bring the opposite bridge decks 1 close to each other for butting, and make the end shear block 3 of one bridge deck 1 match and butt with the end shear groove 4 of the other bridge deck 1. At the same time, make a number of corresponding self-locking connectors 2 in two parallel rows on the upper and lower sides butt against each other. Among them, during the butting process of the self-locking connectors 2, the top buckle cone head 7 of one bridge deck 1 approaches and obliquely presses the semi-circular rotating buckle 12 in the corresponding top buckle slot 8 of the other bridge deck 1, so that the spring top block 14 and the spring slot 13 jointly tighten and compress the spring 15, and make the semi-circular rotating buckle 12 completely retract into the semi-circular slot 10;

[0046] When the top buckle cone head 7 is completely inserted into the top buckle slot 8, the semi-circular slots 10 of the two butted bridge decks 1 are concentrically buckled into a circular slot on the left and right. At the same time, the top buckle cone head 7 releases the extrusion of the semi-circular rotating buckle 12, and the semi-circular rotating buckle 12 is self-reset and inserted into the semi-circular slot 10 of the top buckle cone head 7 of the butted bridge deck 1 under the pushing of the compressed spring 15 to achieve the anchor lock connection of the self-locking connector 2;

[0047] Thread the prestressing tendon 19 through the butted bridge deck 1 and tension the prestress.

[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A self-locking connection structure for the composite girder bridge deck, characterized in that It includes two butt-jointed bridge decks penetrated by post-tensioned tendons. At the butt-jointed ends of the two bridge decks, there are two rows of parallel self-locking connectors arranged vertically and horizontally in the width direction, including several pairs of self-locking connectors connected in opposite directions. Between the two rows of self-locking connectors, there are end shear blocks and end shear grooves that extend in the width direction and are matched and buckled in opposite directions. One end of the self-locking connector is fixedly connected to the longitudinal tensioned reinforcement inside the bridge deck through a straight thread sleeve joint. The other end is configured with a top buckle cone head protruding from the end of the bridge deck, a top buckle card slot recessed in the end of the bridge deck, and a rotary buckle arranged at the center of the adjacent surfaces of the button cone head and the top buckle card slot. The rotary buckle is configured to lock the top buckle cone head inserted into the top buckle card slot. The rotary buckle includes a semi-circular card slot, a semi-cylindrical shaft, and a semi-circular rotary buckle. The semi-circular card slot is opened at the center of the adjacent surfaces of the button cone head and the top buckle card slot, and the straight edge opening of the semi-circular card slot is flush with the adjacent surface. The semi-cylindrical shaft is concentric with the semi-circular card slot, and the straight side surface of the semi-cylindrical shaft is flush with the straight edge opening of the semi-circular card slot. The semi-circular rotary buckle is rotatably arranged in the semi-circular card slot around the semi-cylindrical shaft and a part of it that can self-reset protrudes into the top buckle card slot. A spring card slot that rotates coaxially is opened in the semi-circular rotary buckle, and it is sleeved on a spring top block fixed in the semi-circular card slot. The spring card slot is used to accommodate a compression spring. One end of the compression spring is fixedly connected to the spring top block, and the other end is fixedly connected to the inner end of the spring card slot near the top buckle card slot. The same center of the semi-circular card slot, the semi-circular rotary buckle, and the semi-cylindrical shaft is located at the intersection between the opening end face of the top buckle card slot and the adjacent surface of the button cone head.

2. The self-locking connection structure of the composite girder bridge deck according to claim 1, wherein The spring card slot is configured as a 1 / 4 circular arc and is symmetrically arranged with respect to the central axis of the semi-circular rotary buckle.

3. The self-locking connection structure of the composite girder bridge deck according to claim 1, characterized in that The self-locking connector includes an upper half cover and a lower half cover clamped by several screws up and down. The upper half cover and the lower half cover jointly form the top buckle cone head, the top buckle card slot, and clamp the rotary buckle.

4. The construction method of the self-locking connection structure of the composite girder bridge deck according to any one of claims 1 to 3, characterized in that It includes the following method steps: Fix several corresponding self-locking connectors at the ends of the butt-jointed bridge decks. Among them, the part of the semi-circular rotary buckle of the self-locking connector that rotates and self-resets around the semi-cylindrical shaft protrudes into the top buckle card slot. Bring the butt-jointed bridge decks closer to each other, and make the end shear block of one bridge deck match and dock with the end shear groove of the other bridge deck. At the same time, make several corresponding self-locking connectors in two parallel rows on the upper and lower sides dock with each other. Among them, during the docking process of the self-locking connectors, the top buckle cone head of one bridge deck approaches and obliquely presses the semi-circular rotary buckle in the corresponding top buckle card slot of the other bridge deck, so that the spring top block and the spring card slot jointly tighten the compression spring, and the semi-circular rotary buckle is completely retracted into the semi-circular card slot. When the top buckle cone head is completely inserted into the top buckle card slot, the semi-circular card slots of the two butt-jointed bridge decks are concentrically buckled left and right to form a circular slot. At the same time, the top buckle cone head releases the extrusion on the semi-circular rotating buckle, and the semi-circular rotating buckle is self-reset and inserted into the semi-circular card slot of the top buckle cone head of the butt-jointed bridge deck under the pushing of the compression spring to achieve the anchor lock connection of the self-locking connector; A prestressed tendon is passed through the butt-jointed bridge deck and prestressed.

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