Prefabricated contour box girder of deep river crossing bridge

Abstract

The utility model provides a prefabricated contour box girder of a deep river-crossing bridge, relates to the technical field of bridge building, and solves the problem that the construction period is too long due to the fact that cast-in-place needs to wait for concrete forming and curing in sequence when the box girder of the river-crossing bridge is built. An upper main beam is arranged above the lower main beams, opposite pull rods are arranged between the lower main beams and the upper main beam, the top of the upper main beam is connected with a top plate cross frame, a placing block is arranged at the bottom of the opposite side of the lower main beams, a cast-in-place bottom plate is connected between the lower main beams through the placing block, a correction assembly is arranged at the attaching position of the placing block and the cast-in-place bottom plate, and the correction assembly slides along an inclined plane. A plurality of box girder contours formed by the prefabricated lower girders and the upper girders in the device can be constructed at the same time, then concrete pouring and filling are conducted on the contours at the same time, it is not needed to wait for cast-in-situ completion of the box girders in sequence when a bridge is constructed, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, and more specifically, to a precast contour box girder for a cross-deep river bridge. Background Art

[0002] Generally, bridge construction is carried out with box girders as the main body. When constructing a cross-deep river bridge, since construction cannot be carried out by industrial equipment under the bridge, it is only possible to cast box girders in sequence on one side of the bridge pier by in-situ casting.

[0003] However, each section of the existing in-situ casting method requires a very long construction period to complete. It is necessary to wait for the concrete to take shape and be cured before the next section can be constructed, resulting in an overly long construction period for cross-river bridge construction. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a precast contour box girder for a cross-deep river bridge, so as to solve the problem that when constructing the box girder of a cross-river bridge, the construction period is too long because in-situ casting requires waiting for the concrete to take shape and be cured in sequence.

[0005] The embodiments of the utility model are realized through the following technical solutions:

[0006] The utility model provides a precast contour box girder for a cross-deep river bridge, including a lower main beam. An upper main beam is arranged above the lower main beam. A tie rod is arranged between the lower main beam and the upper main beam. A top plate cross frame is connected to the top of the upper main beam. Placing blocks are arranged at the bottoms of opposite sides of the lower main beam. A cast-in-place bottom plate is connected between the lower main beams through the placing blocks. A calibration assembly is arranged at the joint between the placing block and the cast-in-place bottom plate, and the calibration assembly slides along an inclined plane.

[0007] Preferably, the two lower main beams are also connected by tie rods and reinforcing ribs.

[0008] Preferably, the top plate cross frame further includes a resisting block, and the resisting block is a convex block provided at the bottom of the opposite sides of the top plate cross frame and consistent with the placing block.

[0009] Preferably, a plate identical to the cast-in-place bottom plate is connected between the top plate cross frames through the resisting blocks.

[0010] Preferably, the calibration assembly includes a fitting groove, a calibration inclined plane, side plates and fitting blocks. The fitting groove is a groove provided at the top of the placing block. The calibration inclined plane is provided on both sides of the opening of the fitting groove. The side plates are convex blocks provided at the tops of both sides of the cast-in-place bottom plate and cooperating with the placing block. The fitting blocks are provided at the bottoms of the side plates.

[0011] Preferably, the calibration inclined plane is an inclined plane extending obliquely on both sides of the opening of the fitting groove.

[0012] Preferably, the fitting block is a convex block provided at the bottom of the side plate and cooperating with the fitting groove.

[0013] The technical solution of the embodiment of the present utility model has at least the following advantages and beneficial effects:

[0014] 1. Through the box girder contour formed by the precast lower main girder and the upper main girder in the device, multiple of them can be erected simultaneously, and then concrete can be poured and filled on the contour at the same time, so that when building a bridge, it is not necessary to wait for the in-situ casting of the box girder in sequence, shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present utility model, the drawings required to be used in the embodiment will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the overall structural schematic diagram of the present utility model;

[0017] Figure 2 is the top view structural schematic diagram of the present utility model;

[0018] Figure 3 is the overall structural schematic diagram of the lower main girder and the in-situ cast floor slab of the present utility model;

[0019] Figure 4 is the Figure 3 enlarged structural schematic diagram of part A in the present utility model;

[0020] Reference numerals: lower main girder 1, upper main girder 101, tie rod 102, placing block 103, fitting groove 1031, correcting inclined surface 1032, in-situ cast floor slab 104, side plate 1041, fitting block 1042, top plate cross frame 2, abutting block 201. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, if the terms "set", "installed", "connected", "connected" are used, they 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 internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] The following Figures 1 to 4 will be used to describe the present utility model in detail.

[0023] A precast profile box girder for a cross-deep river bridge, including a lower main girder 1. Above the lower main girder 1, there is an upper main girder 101. Between the lower main girder 1 and the upper main girder 101, there are tie rods 102. At the top of the upper main girder 101, there is a top plate cross frame 2. At the bottom of the opposite sides of the lower main girder 1, there are placement blocks 103. Between the lower main girders 1, there is a cast-in-place bottom plate 104 connected through the placement blocks 103. At the joint where the placement block 103 and the cast-in-place bottom plate 104 are in contact, there is a calibration component that slides along an inclined plane. The two lower main girders 1 are also connected through tie rods 102 and reinforcing bars. The top plate cross frame 2 further includes a resisting block 201. The resisting block 201 is a convex block provided at the bottom of the opposite sides of the top plate cross frame 2 and is the same as the placement block 103. Between the top plate cross frames 2, there is a plate the same as the cast-in-place bottom plate 104 connected through the resisting block 201.

[0024] First, when building the box girder of the bridge, the lower main girder 1 and the upper main girder 101 are precast first, and then they are connected through tie rods 102 and reinforcing bars, etc., and then directly connected to one side of the bridge pier for bridge construction. At the same time, because there is only the combination of the lower main girder 1 and the upper main girder 101, the weight is not large, and several can be continuously built on one side without the need for each to be completed by separate cast-in-place before the next box girder can be continued to be built.

[0025] After the box girder profiles composed of several lower main girders 1 and upper main girders 101 are built together, the bottom of the lower main girder 1 is sealed by connecting the cast-in-place bottom plate 104 on the placement blocks 103 between the lower main girders 1. Then, cast-in-place concrete is carried out in the steel bar framework on the cast-in-place bottom plate 104, so as to cast the bottom plate of the box girder, enabling the bottom plates between multiple lower main girders 1 to be cast simultaneously. Then, the webs between the lower main girder 1 and the upper main girder 101 are cast simultaneously, without the need for sequential cast-in-place, which would lead to a long construction period.

[0026] Then, after the bottom plate and the web are poured, a plate the same as the cast-in-place bottom plate 104 is connected between the top plate cross frames 2 provided at the top of the upper main girder 101 through the resisting blocks 201 to complete the pouring of the top plate of the box girder. In this way, when building the bridge, after multiple precast profiles of the lower main girder 1 and the upper main girder 101 are built together, multiple bottom plates, webs, and top plates are poured simultaneously, enabling the construction of multiple box girders to be completed simultaneously, without the need for sequential separate cast-in-place of the box girders, which would lead to an overly long construction period.

[0027] Furthermore, the correction component includes a fitting groove 1031, a correction inclined surface 1032, side plates 1041, and fitting blocks 1042. The fitting groove 1031 is a groove provided at the top of the placing block 103. The correction inclined surface 1032 is provided on both sides of the opening of the fitting groove 1031. The side plates 1041 are convex blocks at the top of both sides of the cast-in-place bottom plate 104 that cooperate with the placing block 103. The fitting blocks 1042 are provided at the bottom of the side plates 1041. The correction inclined surface 1032 is an inclined surface that extends obliquely on both sides of the opening of the fitting groove 1031. The fitting blocks 1042 are convex blocks at the bottom of the side plates 1041 that cooperate with the fitting groove 1031.

[0028] Finally, when connecting the cast-in-place bottom plate 104, the cast-in-place bottom plate 104 is connected by the side plates 1041 on both sides abutting against the top of the placing block 103. At the same time, when placing, the fitting blocks 1042 at the bottom of the side plates 1041 will be fitted into the fitting groove 1031 for positioning. When the fitting block 1042 is fitted into the fitting groove 1031, if there is an error in the placement position of the cast-in-place bottom plate 104, the fitting block 1042 will abut against the correction inclined surface 1032. Through the inclined surface of the correction inclined surface 1032 that inclines towards the fitting groove 1031, when the fitting block 1042 is inserted, if there is an error, it will slide along the inclined surface of the correction inclined surface 1032 by its own weight, so that it can correct itself into the fitting groove 1031, avoiding the inconvenience of adjustment if there is an error when connecting the cast-in-place bottom plate 104.

[0029] The following is the specific implementation process of the present utility model. First, when building the box girder of the bridge, the lower main beam 1 and the upper main beam 101 are prefabricated first, and then connected through tie rods 102, reinforcing ribs, etc., and then directly connected to one side of the bridge pier for bridge construction. At the same time, because there is only the combination of the lower main beam 1 and the upper main beam 101, the weight is not large, and several can be continuously built on one side. It is not necessary to complete the casting of each one separately before continuing to build the next box girder. After the box girder contours formed by several combinations of the lower main beam 1 and the upper main beam 101 are built together, the bottom of the lower main beam 1 is blocked by placing the connecting cast-in-place bottom plate 104 on the block 103 between the lower main beams 1. Then, cast-in-place concrete is carried out in the steel bar framework on the cast-in-place bottom plate 104, so as to cast the bottom plate of the box girder, enabling the simultaneous casting of the bottom plates between multiple lower main beams 1. Then, the webs between the lower main beam 1 and the upper main beam 101 are simultaneously cast-in-place, without casting-in-place in sequence, which may lead to a long construction period. Then, after the bottom plate and the web are cast, the same plate as the cast-in-place bottom plate 104 is connected between the top plate cross frames 2 provided on the top of the upper main beam 101 through the abutting blocks 201 to complete the casting of the top plate of the box girder. In this way, when building the bridge, after multiple prefabricated contours of the lower main beam 1 and the upper main beam 101 are built together, the casting of multiple bottom plates, webs, and top plates is carried out simultaneously, enabling the simultaneous completion of the construction of multiple box girders, without the need to cast each box girder separately in sequence, which may lead to an overly long construction period.

[0030] The above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A prefabricated outline box girder for a bridge across a deep river, comprising a lower main girder (1), characterized in that: An upper main beam (101) is arranged above the lower main beam (1), a tension rod (102) is arranged between the lower main beam (1) and the upper main beam (101), a top plate cross frame (2) is connected to the top of the upper main beam (101), a placement block (103) is arranged at the bottom of the opposite side of the lower main beam (1), a cast-in-place bottom plate (104) is connected between the lower main beams (1) through the placement block (103), and a correction component is arranged at the joint between the placement block (103) and the cast-in-place bottom plate (104), and the correction component slides along the inclined surface.

2. The prefabricated outline box girder for a bridge across a deep river according to claim 1, characterized in that: The two lower main beams (1) are also connected via tie rods (102) and reinforcing ribs.

3. The prefabricated outline box girder for a bridge across a deep river according to claim 1, characterized in that: The top plate cross frame (2) also includes a stop block (201), which is a protrusion that is arranged on the bottom of one side opposite to the top plate cross frame (2) and is consistent with the placement block (103).

4. The prefabricated outline box girder for a bridge across a deep river according to claim 3, characterized in that: The top plate cross frames (2) are connected with a plate material which is the same as the cast-in-place bottom plate (104) via abutment blocks (201).

5. The prefabricated outline box girder for a bridge across a deep river according to claim 1, characterized in that: The correction component comprises an engaging groove (1031), a correction inclined surface (1032), a side plate (1041) and an engaging block (1042); the engaging groove (1031) is a groove arranged at the top of the placement block (103); the correction inclined surface (1032) is arranged at both sides of the opening of the engaging groove (1031); the side plate (1041) is a convex block at the top of both sides of the cast-in-place bottom plate (104) that cooperates with the placement block (103); and the engaging block (1042) is arranged at the bottom of the side plate (1041).

6. The prefabricated outline box girder for a bridge across a deep river according to claim 5, characterized in that: The correction inclined surface (1032) is an inclined surface extending obliquely from both sides of the opening of the fitting groove (1031).

7. The prefabricated outline box girder for a bridge across a deep river according to claim 5, characterized in that: The engaging block (1042) is a protrusion at the bottom of the side plate (1041) that cooperates with the engaging groove (1031).

Images