A steel-concrete combined embedded thrust stop structure for cable-stayed bridge cable basket

Abstract

The present invention relates to the technical field of cable-stayed bridge construction, and specifically to a cable-stayed bridge cable hanging basket steel-concrete combined embedded thrust stop structure, which aims to solve the technical problem that the existing cable-stayed bridge cable hanging basket thrust stop structure will cause adverse effects on the clearance under the bridge and the aesthetics of the bridge. The following technical scheme is adopted: the box girder and the hanging basket are provided, the box girder is provided with a box girder bottom plate, the hanging basket is provided with a hanging basket bottom beam, the bottom plate of the box girder is provided with a reserved hole, a thrust block located at the edge of the reserved hole is provided in the box girder, a shear block is fixed on the bottom beam of the hanging basket, the upper end of the shear block passes through the reserved hole and extends into the box girder, and under the action of the horizontal component force of the cable, the shear block abuts against the surface of the thrust block.

Description

Technical Field

[0001] The invention relates to the technical field of cable-stayed bridge construction, in particular to a steel-concrete combined embedded thrust stop structure for a cable-stayed bridge guy wire hanging basket. Background Art

[0002] Cable-stayed bridges use cable hanging baskets for cantilever concrete pouring. The rear end of the basket is anchored on the poured concrete box girder section, and the front end is fixed by cables. During the construction project, the cable force needs to be continuously adjusted to bear the wet weight of the poured concrete and the construction load. At this time, the cable will generate a horizontal component force on the basket. Therefore, it is necessary to set a structure between the basket and the box girder to resist the horizontal component force to prevent the basket from moving backward under the action of the cable force, that is, the thrust structure. The existing thrust structure uses concrete shear blocks or embedded steel shear blocks cast on the outside of the box girder bottom plate to contact the shear blocks set on the bottom beam of the basket to resist the horizontal component force of the cable. However, the thrust structure has certain limitations: 1) Due to the large horizontal component force generated by the cable, the concrete shear blocks or embedded steel shear blocks set at the bottom of the box girder are required to be large in size, which will affect the clearance under the bridge; 2) For urban landscape bridges, setting concrete shear blocks or embedded steel shear blocks at the bottom of the box girder has a certain impact on the aesthetics of the bridge. Summary of the invention

[0003] The invention aims to solve the technical problem that the thrust stop structure of the existing cable-stayed bridge cable hanging basket may have adverse effects on the clearance under the bridge and the appearance of the bridge.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A cable-stayed bridge cable-stayed basket steel-concrete combined embedded thrust structure comprises a box girder and a basket, wherein the box girder is provided with a box girder bottom plate, and the basket is provided with a basket bottom beam. The box girder and the basket are structures well known to persons skilled in the art, and their connection relationship is also well known. The box girder bottom plate is provided with a reserved hole, and a thrust block located at the edge of the reserved hole is provided in the box girder. A shear block is fixed on the basket bottom beam, and the upper end of the shear block extends into the box girder through the reserved hole, and under the action of the horizontal component force of the cable, the shear block abuts against the surface of the thrust block.

[0006] When in use, the shear block and the thrust block are in contact to resist the horizontal force of the guy wire on the hanging basket. The main invention point of the present invention is that the thrust block is arranged on the inner side of the box beam, and the shear block is extended into the box beam and abuts against the surface of the thrust block.

[0007] The beneficial effects of the present invention are:

[0008] 1) The cable-stayed bridge guy basket provided by the present invention has a steel-concrete combined embedded thrust structure, in which the thrust block on the bottom plate of the box beam is arranged inside the box beam, and a reserved hole is provided for the shear block on the basket to be inserted, thereby reducing the height of the bottom beam of the basket to a certain extent and increasing the clearance under the bridge;

[0009] 2) The cable-stayed bridge guy-hanging basket steel-concrete combined embedded thrust structure provided by the present invention has thrust blocks arranged inside the box girder, which greatly reduces the impact on the aesthetics of the municipal landscape bridge compared to the traditional method of arranging thrust blocks on the outer side of the bottom of the box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 It is an axonometric diagram of the overall structure of the present invention;

[0012] Figure 2 is an axonometric view of the upper shear structure of the present invention;

[0013] Figure 3 is an axonometric view of the lower shear structure of the present invention;

[0014] Figure 4 It is an axonometric view of the cross section of the lower shear structure of the present invention.

[0015] In the figure:

[0016] 1┄ box girder bottom plate; 2┄ hanging basket bottom beam; 3┄ thrust block; 4┄ shear block; 5┄ prestressed steel strand; 21┄ second stiffening plate; 41┄ upper shear structure; 42┄ lower shear structure; 43┄ connecting bolts; 411┄ plane baffle; 412┄ cover plate; 413┄ side plate; 421┄ thrust baffle; 422┄ first stiffening plate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] Reference Figure 1The invention discloses a cable-stayed bridge guy-cable hanging basket steel-concrete combined embedded thrust structure, comprising a box girder and a hanging basket. In specific implementation, the box girder is a concrete box girder, the box girder is provided with a box girder bottom plate 1, the hanging basket is provided with a hanging basket bottom beam 2, the bottom plate of the box girder is provided with a reserved hole, and a thrust block 3 located at the edge of the reserved hole is provided in the box girder. In specific implementation, the thrust block 3 can be a concrete shear block or a pre-embedded steel shear block. The thrust block 3 must be set at the edge of the reserved hole, otherwise the shear block 4 cannot contact the thrust block 3 when it is extended into the box, which loses the meaning of setting; a shear block 4 is fixed on the bottom beam of the hanging basket. In specific implementation, the shear block 4 is preferably made of steel structure and can be welded and fixed on the hanging basket; the upper end of the shear block 4 passes through the reserved hole and extends into the interior of the box girder, and under the action of the horizontal component force of the guy cable, the shear block 4 abuts against the surface of the thrust block 3.

[0019] Reference Figure 2-Figure 4 Here, a preferred structure of the shear block 4 in the above technical solution is provided: the shear block 4 includes an upper shear structure 41, a lower shear structure 42, and a connecting bolt 43. The lower shear structure 42 includes a plurality of parallel thrust baffles 421 fixed on the bottom beam 2 of the hanging basket. The arrangement direction of the thrust baffles 421 is consistent with the horizontal force direction of the guy wire. Space for the prestressed steel strand 5 to pass through is formed between adjacent thrust baffles 421. The corner of the thrust baffle 421 close to the thrust block 3 is a right angle. The purpose of the right angle is to be able to adapt to the cover plate 412 and the plane baffle 411. The upper shear block 41 is provided with a plurality of parallel thrust baffles 421 fixed on the bottom beam 2 of the hanging basket. The arrangement direction of the thrust baffles 421 is consistent with the horizontal force direction of the guy wire. Space for the prestressed steel strand 5 to pass through is formed between adjacent thrust baffles 421. The corner of the thrust baffle 421 close to the thrust block 3 is a right angle. The purpose of the right angle is to be able to adapt to the cover plate 412 and the plane baffle 411. The structure 41 is a partial rectangular shell structure formed by a plane baffle 411, a cover plate 412, and two side plates 413 integrally formed or fixedly connected. The partial rectangular shell structure is the structure remaining after a group of adjacent faces of the rectangular shell are removed. The plane baffle 411 and the cover plate 412 are both perpendicular to the thrust baffle 421, and the plane baffle 411 is arranged between the thrust baffle 421 and the thrust block 3, and the cover plate 412 is adjacent to the upper side of the thrust baffle 421. The two side plates 413 are parallel to the thrust baffle 421 and are respectively fixed to the two outermost thrust baffles 421 by connecting bolts 43. Here, if the upper shear structure 41 is not provided, the contact area between the shear block 4 and the thrust block 3 is the side surface of several thrust baffles 421, and the force-bearing area is small, which is easy to exceed the upper limit of the force per unit area, causing structural failure; if in order to solve this problem, the lower shear structure 42 is set as a solid structure, it is more difficult to penetrate the prestressed steel strand 5. Even if the penetration hole is preset, the weight of the solid structure is too large to meet the needs. Therefore, in this preferred solution, the upper shear structure 41 is cleverly added, and the lower shear structure 42 can be made into a structure composed of several thrust baffles 421, and a space for the prestressed steel strand 5 to pass through is formed between adjacent thrust baffles 421. The structure is light in weight and the force-bearing area is effectively increased, which is very practical.

[0020] Furthermore, a first stiffening plate 422 is provided between the lower portions of adjacent thrust baffles 421 to enhance the structural stability of the thrust baffles 421 and avoid structural failure. In specific implementation, the first stiffening plate 422 can be welded to the lower portion of the thrust baffle 421 .

[0021] Furthermore, the corner of the upper edge of the thrust baffle 421 away from the thrust block 3 is set to a chamfered shape, so that the reserved hole of the box body can be designed to be relatively small. If the corner of the upper edge of the thrust baffle 421 away from the thrust block 3 is also set to a right angle, the reserved hole must be larger than the length of the thrust baffle 421, but is set to a chamfered structure. When the thrust baffle 421 extends into the reserved hole, the chamfered part does not extend completely. In this way, the reserved hole only needs to be larger than the size of the thrust baffle 421 at the corresponding position, and the size of the part of the thrust baffle 421 located below the reserved hole can still be larger to ensure structural stability.

[0022] The specific steps for using the shear block 4 are as follows:

[0023] 1) The upper shear structure 41, the connecting bolts 43 and the lower shear structure 42 are processed respectively, wherein the lower shear structure 42 and the bottom beam 2 of the hanging basket are welded firmly at the designed position;

[0024] 2) When pouring the corresponding beam section of the box beam, a reserved hole is set on the bottom plate 1 of the box beam, and a thrust block 3 is set inside the box beam;

[0025] 3) After the hanging basket moves to its position, the whole structure is lifted, and the thrust baffle 421 of the lower shear structure 42 passes through the reserved hole of the box beam bottom plate 1 and enters the interior of the box beam, wherein the prestressed steel strand 5 of the box beam bottom plate 1 is inserted into the space between the two thrust baffles 421;

[0026] 4) The upper shear structure 41 and the lower shear structure 42 are connected into a whole by connecting bolts 43;

[0027] 5) Adjust the position of the hanging basket so that the plane baffle 411 of the upper shear structure 41 fits tightly with the thrust block 3 in the box beam;

[0028] 6) During the construction of the guyed basket, the horizontal force component of the basket generated by the guyed cables can be smoothly transmitted to the concrete box girder through this thrust device.

[0029] Preferably, the bottom beam 2 of the hanging basket is set as a square tube structure, and a well-shaped second stiffening plate 21 is arranged inside, which not only meets the requirements of lightweight, but also greatly enhances the structural stability of the bottom beam 2 of the hanging basket. In specific implementation, the second stiffening plate 21 can be welded inside the bottom beam 2 of the hanging basket.

[0030] The same or similar numbers in the drawings of the embodiments correspond to the same or similar parts; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cable-stayed bridge guy-cable hanging basket steel-concrete combined embedded thrust stop structure, comprising a box girder and a hanging basket, the box girder is provided with a box girder bottom plate (1), the box girder bottom plate (1) is provided with a prestressed steel strand (5), and the hanging basket is provided with a hanging basket bottom beam (2), characterized in that: A reserved hole is provided on the bottom plate (1) of the box beam, a thrust block (3) is provided inside the box beam and is located at the edge of the reserved hole, a shear block (4) is fixed on the bottom beam (2) of the hanging basket, the upper end of the shear block (4) passes through the reserved hole and extends into the interior of the box beam, and under the action of the horizontal component force of the guy wire, the shear block (4) abuts against the surface of the thrust block (3); The shear block (4) comprises an upper shear structure (41), a lower shear structure (42), and connecting bolts (43). The lower shear structure (42) comprises a plurality of parallel thrust baffles (421) fixed on the bottom beam (2) of the hanging basket. The arrangement direction of the thrust baffles (421) is consistent with the horizontal force direction of the guy wire. Space for the prestressed steel strand (5) to pass through is formed between adjacent thrust baffles (421). The corner of the thrust baffle (421) close to the thrust block (3) is a right angle. The upper shear structure (41) is composed of a flat baffle (411), a cover plate (412), and two side plates. (413) A partially rectangular shell structure formed by integral molding or fixed connection, wherein the partially rectangular shell structure is a structure remaining after a group of adjacent faces of the rectangular shell are removed, wherein the plane baffle (411) and the cover plate (412) are both perpendicular to the thrust baffle (421), and the plane baffle (411) is arranged between the thrust baffle (421) and the thrust block (3), and the cover plate (412) is adjacent to the upper side of the thrust baffle (421), and the two side plates (413) are parallel to the thrust baffle (421) and are respectively fixed to the two outermost thrust baffles (421) by connecting bolts (43).

2. According to claim 1, a cable-stayed bridge guy basket steel-concrete combined embedded thrust structure is characterized by: A first stiffening plate (422) is provided between the lower portions of adjacent thrust baffles (421).

3. According to claim 2, a cable-stayed bridge guy basket steel-concrete combined embedded thrust structure is characterized by: The corner of the upper edge of the thrust baffle (421) away from the thrust block (3) is arranged to be chamfered.

4. A cable-stayed bridge guy basket steel-concrete combined embedded thrust structure according to any one of claims 1 to 3, characterized in that: The bottom beam (2) of the hanging basket is a square tube structure and is provided with a well-shaped second stiffening plate (21) therein.

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