Steel-concrete combined cantilever casting concrete bridge deck slab supporting structure

Abstract

The utility model discloses a steel-concrete combined cantilever pouring concrete bridge deck slab supporting structure which comprises an external supporting assembly and an internal supporting assembly which are used for supporting a concrete pouring bridge deck slab, and the external supporting assembly comprises a steel beam steel top plate arranged at the top of a box beam and a bottom die steel plate connected with the steel beam steel top plate. Bottom die steel plates are arranged on the two sides of the steel beam steel top plate, side die steel plates are connected to the cantilever ends of the two sides of each bottom die steel plate, end dies are connected to the two longitudinal ends of each bottom die steel plate, and a plurality of stiffening ribs are arranged at the bottoms of the steel beam steel top plate and the bottom die steel plates in the bridge direction. The internal supporting assembly comprises a plurality of tensile steel bars arranged in the bridge direction, one ends of the tensile steel bars are connected with the cantilever ends of one sides of the bottom die steel plates, the other ends of the tensile steel bars are connected with the cantilever ends of the other sides of the bottom die steel plates, and the two ends of the tensile steel bars are connected with the side die steel plates on the corresponding sides through connecting steel bars. According to the technical scheme, the construction steps of the bridge deck slab can be simplified, and the construction period is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of cantilever cast concrete bridge deck support, and in particular relates to a steel-concrete combined cantilever cast concrete bridge deck support structure. Background Art

[0002] At present, in order to adapt to the modern high-speed development of the transportation industry, bridges are also extended to buildings that are built across mountain streams, poor geology or to meet other traffic needs to make travel more convenient. Bridges are generally composed of upper bridge deck structures, lower support structures and auxiliary structures. When building a bridge, the lower support structure is constructed first, and then the upper bridge deck is constructed. Since the distance between the bottom of the upper bridge deck and the ground is large, generally between 10 and 30 meters, when constructing the existing upper bridge deck structure, the cantilever structure on both sides of the bridge needs to be supported by full-bridge support frames first, and then concrete is poured to form the bridge deck. After the strength of the bridge deck reaches the design requirements, the full-bridge support frames on both sides are removed.

[0003] However, the construction steps of erecting the full-hall frame and removing the full-hall support frame are cumbersome and the construction period is long. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a steel-concrete composite cantilever cast concrete bridge deck support structure, which can simplify the construction steps of the bridge deck and shorten the construction period based on tensile steel bars and connecting steel bars.

[0005] The technical solution provided by the utility model is:

[0006] A steel-concrete composite cantilever cast concrete bridge deck support structure, characterized in that it comprises: an external support assembly and an internal support assembly of the bridge deck for supporting concrete casting, the external support assembly comprises a steel beam steel top plate arranged on the top of a box beam and a bottom formwork steel plate connected to the steel beam steel top plate, the bottom formwork steel plates are arranged on both sides of the steel beam steel top plate, both cantilever ends of the bottom formwork steel plates are connected to side formwork steel plates, both longitudinal ends of the bottom formwork steel plates are connected to end forms, and a plurality of stiffening ribs are arranged at the bottom of the steel beam steel top plate and the bottom formwork steel plate along the bridge direction;

[0007] The internal support assembly includes a plurality of tensile steel bars arranged along the bridge direction, one end of the tensile steel bar is connected to the cantilever end on one side of the bottom formwork steel plate, the other end of the tensile steel bar is connected to the cantilever end on the other side of the bottom formwork steel plate, and both ends of the tensile steel bar are connected to the side formwork steel plate on the corresponding side through connecting steel bars.

[0008] The above-mentioned steel-concrete composite cantilever cast concrete bridge deck support structure is characterized in that: a plurality of stiffening ribs are evenly spaced at the bottom of the steel beam steel top plate and the bottom formwork steel plate along the bridge direction, and the spacing between two adjacent stiffening ribs is 2m to 5m.

[0009] The above-mentioned steel-concrete composite cantilever cast-concrete bridge deck support structure is characterized in that the structure of the stiffening ribs is adapted to the transverse structure of the bridge deck.

[0010] The above-mentioned steel-concrete composite cantilever cast-in-place concrete bridge deck support structure is characterized in that the internal support component includes a plurality of tensile steel bars arranged at equal intervals along the bridge direction, and the spacing between two adjacent tensile steel bars is 1m to 3m.

[0011] The above-mentioned steel-concrete composite cantilever cast-in-place concrete bridge deck support structure is characterized in that the tensioned steel bars are of an inverted U-shaped structure, and both ends of the tensioned steel bars of the inverted U-shaped structure are provided with inward folding portions, the inward folding portions of the tensioned steel bars are welded to the cantilever end of the bottom formwork steel plate, and the length of the inward folding portions of the tensioned steel bars is 10 cm to 30 cm.

[0012] The above-mentioned steel-concrete composite cantilever cast-in-place concrete bridge deck support structure is characterized in that: the inverted L-shaped structure of the connecting steel bars, the horizontal part of the connecting steel bars of the inverted L-shaped structure is welded to the upper horizontal part of the tensile steel bars of the inverted U-shaped structure, and the vertical part of the connecting steel bars of the inverted L-shaped structure is welded to the side formwork steel plate on the corresponding side.

[0013] The beneficial effect reasoning analysis is as follows:

[0014] In the prior art, the construction steps of erecting the full-height frame and removing the full-height support frame are complicated and the construction period is long.

[0015] In the technical solution of the utility model, tensile steel bars (i.e. tensile steel bars and connecting steel bars) are arranged before building the bridge deck, and then the bridge deck is cast to form the bridge deck, thereby avoiding the cumbersome construction steps and long construction period caused by the need to build and remove the full-bridge support frame during the construction of the bridge deck in the prior art.

[0016] At the same time, in the technical solution of the utility model, firstly, the tension steel bars in the supporting structure can provide upward tension to the cantilevers on both sides of the bridge deck without box beam support and gather toward the center line of the bridge deck, and the connecting steel bars can reinforce the tension steel bars, ensuring the stability of the tension provided by the tension steel bars. Secondly, the tension is balanced with the deadweight of the concrete cantilever, ensuring the stability of the cantilevers on both sides of the bridge deck.

[0017] Therefore, by adopting the solution of the utility model, the steps of bridge deck construction can be simplified and the bridge deck construction period can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A side sectional view of a support structure provided by an embodiment of the utility model;

[0019] Figure 2 for Figure 1 A magnified view of the inner support assembly;

[0020] Figure 3 A front view of a support structure provided by an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] Box girder 1; stiffening rib 2; steel beam steel top plate 3;

[0023] Bottom form steel plate 4; side form steel plate 5; tensile steel bar 6;

[0024] Connecting steel bars7. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the embodiments and drawings. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention, that is, the features of the embodiments, can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In the prior art, the construction steps of erecting the full-height frame and removing the full-height support frame are complicated and the construction period is long.

[0028] Based on this, an embodiment of the utility model provides a steel-concrete composite cantilever cast-in-place concrete bridge deck support structure, in which tensile steel bars (i.e. tensile steel bars and connecting steel bars) are arranged before building the bridge deck, and then the bridge deck is cast to form the structure. This avoids the cumbersome construction steps and long construction period caused by the need to build and remove a full-bridge support frame during the construction of the bridge deck in the prior art.

[0029] Figure 1 A side sectional view of a support structure provided by an embodiment of the utility model, Figure 2 for Figure 1 A magnified view of the internal support assembly. Figure 3 A front view of a support structure provided by an embodiment of the utility model.

[0030] See also Figure 1The support structure includes: an external support assembly and an internal support assembly for supporting the bridge deck for concrete pouring, the external support assembly includes a steel beam steel top plate 3 arranged on the top of the box beam 1 and a bottom formwork steel plate 4 connected to the steel beam steel top plate 3, bottom formwork steel plates 4 are arranged on both sides of the steel beam steel top plate 3, both cantilever ends of the bottom formwork steel plate 4 are connected to side formwork steel plates 5, both longitudinal ends of the bottom formwork steel plate 4 are connected to end forms, and a plurality of stiffening ribs 2 are arranged at the bottom of the steel beam steel top plate 3 and the bottom formwork steel plate 4 along the bridge direction;

[0031] The internal support assembly includes a plurality of tensile steel bars 6 arranged along the direction of the bridge, one end of the tensile steel bar 6 is connected to the cantilever end on one side of the bottom formwork steel plate 4, the other end of the tensile steel bar 6 is connected to the cantilever end on the other side of the bottom formwork steel plate 4, and both ends of the tensile steel bar 6 are connected to the side formwork steel plate 5 on the corresponding side through connecting steel bars 7.

[0032] First, the "steel-concrete composite cantilever cast-concrete bridge deck support structure" is explained. The bridge deck is formed by pouring concrete. The bridge deck support structure includes internal support components. The internal support components are tensile steel bars (i.e., tensile steel bars 6 and connecting steel bars 7). After concrete is poured on the tensile steel bars, a bridge deck is formed (the bridge deck includes cantilevers on both sides of the bridge deck). The material of the bridge deck is a combination of steel bars and concrete.

[0033] Secondly, the functions of the components in the bridge deck support structure are explained.

[0034] Among them, the bridge deck (i.e. the driving lane slab) is a load-bearing structure formed after pouring concrete, which directly bears the pressure of people's feet or wheels.

[0035] The box girder 1 can bear the weight of the bridge deck and traffic loads (eg, people and vehicles).

[0036] The stiffening ribs 2 can enhance the bending resistance of the bridge deck (for example, the cantilevers on both sides of the bridge deck bend downward due to gravity), so that the bridge deck can better withstand external forces.

[0037] The bottom formwork steel plate 4 is used to form a bridge deck. It can be understood that the bridge deck is formed after concrete is poured on the bottom formwork steel plate 4.

[0038] The tensile steel bars 6 are used to provide a pulling force upward and toward the center line of the bridge deck to both ends of the bridge deck. The pulling force is balanced with the deadweight of the concrete cantilever, thereby ensuring the stability of the bridge deck.

[0039] The connecting steel bars 7 are used to reinforce the tension steel bars 6, that is, to play a fixing role so that the tension provided by the tension steel bars 6 can be stable (for example, the value of the tension is a fixed value or is within a certain range).

[0040] The tension steel bar 6 is fixedly connected to the bottom form steel plate 4 and the connecting steel bar 7, and the connecting steel bar 7 is fixedly connected to the side form steel plate 5. That is, when the tension steel bar 6 is fixedly connected to the bottom form steel plate 4 (for example, welded), the tension steel bar has the function of providing tension and stabilizing the tension.

[0041] The beneficial effect reasoning analysis is as follows:

[0042] In the prior art, the construction steps of erecting the full-height frame and removing the full-height support frame are complicated and the construction period is long.

[0043] In the technical solution of the utility model, tensile steel bars (i.e. tensile steel bars and connecting steel bars) are arranged before building the bridge deck, and then the bridge deck is cast to form the bridge deck, thereby avoiding the cumbersome construction steps and long construction period caused by the need to build and remove the full-bridge support frame during the construction of the bridge deck in the prior art.

[0044] At the same time, in the technical solution of the utility model, firstly, the tension steel bars in the supporting structure can provide the cantilevers on both sides of the bridge deck without the box beam support with a pulling force that is upward and gathered toward the center line of the bridge deck, and the connecting steel bars can reinforce the tension steel bars, thereby ensuring the stability of the tension provided by the tension steel bars. Secondly, since the tension is balanced with the deadweight of the concrete cantilever, the stability of the cantilevers on both sides of the bridge deck is ensured.

[0045] Therefore, by adopting the solution of the utility model, the steps of bridge deck construction can be simplified and the bridge deck construction period can be shortened.

[0046] In another embodiment provided by the utility model, a plurality of stiffening ribs 2 are evenly spaced at the bottom of the steel beam steel top plate 3 and the bottom formwork steel plate 4 along the bridge direction, and the spacing between two adjacent stiffening ribs 2 is 2m to 5m.

[0047] In another embodiment provided by the present invention, the structure of the stiffening rib 2 is adapted to the transverse structure of the bridge deck.

[0048] In another embodiment provided by the utility model, the internal support assembly includes a plurality of tension steel bars 6 arranged at equal intervals along the bridge direction, and the interval between two adjacent tension steel bars 6 is 1m to 3m.

[0049] In another embodiment provided by the utility model, the tensile steel bar 6 is an inverted U-shaped structure, and both ends of the tensile steel bar 6 of the inverted U-shaped structure are provided with inward folding parts. The inward folding parts of the tensile steel bar 6 are welded to the cantilever end of the bottom formwork steel plate 4, and the length of the inward folding parts of the tensile steel bar 6 is 10cm to 30cm.

[0050] In another embodiment provided by the utility model, the inverted L-shaped structure of the connecting steel bar 7, the horizontal portion of the connecting steel bar 7 of the inverted L-shaped structure is welded to the upper horizontal portion of the tensile steel bar 6 of the inverted U-shaped structure, and the vertical portion of the connecting steel bar 7 of the inverted L-shaped structure is welded to the side form steel plate 5 on the corresponding side.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A steel-concrete composite cantilever cast concrete bridge deck support structure, characterized in that: include: The external support assembly and the internal support assembly of the bridge deck are used to support concrete pouring, wherein the external support assembly comprises a steel beam steel top plate (3) arranged on the top of the box beam (1) and a bottom formwork steel plate (4) connected to the steel beam steel top plate (3), the bottom formwork steel plates (4) are arranged on both sides of the steel beam steel top plate (3), the cantilever ends on both sides of the bottom formwork steel plate (4) are connected to side formwork steel plates (5), the longitudinal ends of the bottom formwork steel plate (4) are connected to end forms, and the bottom of the steel beam steel top plate (3) and the bottom formwork steel plate (4) along the bridge direction are provided with a plurality of stiffening ribs (2); The internal support assembly comprises a plurality of tensioned steel bars (6) arranged along the bridge direction, one end of the tensioned steel bar (6) being connected to a cantilever end on one side of the bottom formwork steel plate (4), the other end of the tensioned steel bar (6) being connected to a cantilever end on the other side of the bottom formwork steel plate (4), and both ends of the tensioned steel bar (6) being connected to the side formwork steel plate (5) on the corresponding side via connecting steel bars (7).

2. The steel-concrete composite cantilever cast concrete bridge deck support structure according to claim 1, characterized in that: The steel beam steel top plate (3) and the bottom formwork steel plate (4) are provided with a plurality of stiffening ribs (2) at equal intervals at the bottom along the bridge direction, and the interval between two adjacent stiffening ribs (2) is 2m to 5m.

3. The steel-concrete composite cantilever cast concrete bridge deck support structure according to claim 1, characterized in that: The structure of the stiffening rib (2) is adapted to the transverse structure of the bridge deck.

4. The steel-concrete composite cantilever cast concrete bridge deck support structure according to claim 1, characterized in that: The internal support assembly comprises a plurality of tension steel bars (6) arranged at equal intervals along the bridge direction, and the interval between two adjacent tension steel bars (6) is 1m to 3m.

5. The steel-concrete composite cantilever cast concrete bridge deck support structure according to claim 1, characterized in that: The tensile steel bar (6) is an inverted U-shaped structure, and both ends of the tensile steel bar (6) of the inverted U-shaped structure are provided with inward folding parts. The inward folding parts of the tensile steel bar (6) are welded to the cantilever end of the bottom formwork steel plate (4), and the length of the inward folding parts of the tensile steel bar (6) is 10 cm to 30 cm.

6. The steel-concrete composite cantilever cast concrete bridge deck support structure according to claim 5, characterized in that: The inverted L-shaped structure of the connecting steel bar (7) The horizontal portion of the connecting steel bar (7) is welded to the upper horizontal portion of the tension steel bar (6) of the inverted U-shaped structure. The vertical portion of the connecting steel bar (7) of the inverted L-shaped structure is welded to the side form steel plate (5) on the corresponding side.

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