CN213358288U - Bridge surface beam and arch building system suitable for large-span cantilever pouring concrete arch bridge - Google Patents

Abstract

The utility model relates to the field of reinforced concrete arch bridges, in particular to a bridge surface beam and arch building system suitable for a long-span cantilever casting concrete arch bridge; the bridge deck beam comprises a combined bridge deck and a plurality of I-shaped beams, wherein the I-shaped beams are used for supporting the combined bridge deck; the combined bridge deck comprises a steel bottom plate and concrete, wherein the steel bottom plate is laid above the I-shaped beam, and the concrete is arranged on the steel bottom plate; the arched building system comprises a thin-wall box type stand column with a steel inner shell combined structure, a prestressed capping beam and the bridge surface beam, wherein the lower part of the prestressed capping beam is fixedly connected with the stand column, and the upper part of the prestressed capping beam is used for bearing the bridge surface beam, so that the arched building system is integrally lightened, and further development of span is promoted.

Description

Bridge surface beam and arch building system suitable for large-span cantilever pouring concrete arch bridge

Technical Field

The utility model relates to a reinforced concrete arched bridge field, especially a bridge face roof beam, hunch building system suitable for stride the cantilever casting concrete arched bridge greatly.

Background

The domestic arch bridge cantilever casting method is used and developed from Wenchang in Sichuan province to Panzhihua expressway major span No. 150 m white sand ditch No. 1 bridge in the beginning of the century, most of the currently built cantilever casting arch bridges in China are about 200 m, and the breakthrough of the span is not great at present. The existing cast-in-place cantilever arch bridge in China has the disadvantages that the large size of the section of an arch ring is large, and the heavy weight of an arch building (an arch rib superstructure) is also a factor for limiting the further increase of the span. The arch bridge includes upright posts, capping beams and bridge surface beams; the arch upright posts are usually of reinforced concrete box type structures and have self-weight, in a large-span arch bridge, in order to reduce the self-weight, a plurality of cavity box chambers are usually arranged in the upright posts, all the box chambers are transversely separated by arranging partition plates, and man holes are reserved in the middle of the partition plates; the bent cap is usually of a rectangular section and a common reinforced concrete structure, and has a large section size and a large dead weight; meanwhile, the upper structure bridge deck beam adopts a plurality of forms such as a prefabricated small box girder, a prefabricated hollow slab and a prefabricated T beam, and the concrete bridge deck beam has the defects of great weight, difficult hoisting and the like, so that the further increase of the span of the main arch is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the problem that the dead weight of the arch building in the prior art greatly influences the further increase of the span of the main arch, the bridge surface beam and the arch building system suitable for the large-span cantilever casting concrete arch bridge are provided, and the structure lightening can be realized.

In order to realize the purpose, the utility model discloses a technical scheme be:

a bridge deck beam suitable for a large-span cantilever casting concrete arch bridge comprises a combined bridge deck and a plurality of I-shaped beams, wherein the I-shaped beams are used for supporting the combined bridge deck; the combined bridge deck comprises a steel bottom plate and concrete, wherein the steel bottom plate is laid above the I-shaped beam, and the concrete is arranged on the steel bottom plate. The utility model discloses a I type roof beam, steel-concrete combination decking technique, simple structure, erect convenient, easy to maintain, the durability is good, has reduced bridge floor beam concreting volume, and the steel-concrete combination roof beam weight and the hoist weight of 30 meters span are compared traditional T roof beam and have been reduced nearly 30%, can reduce engineering cost, and are outstanding to the application advantage of arched bridge deck beam lightweight.

As a preferred scheme of the present invention, each I-shaped beam is vertically disposed, and the length direction of each I-shaped beam extends along the same direction (i.e. the I-shaped beams are parallel to each other); two adjacent I-shaped beams are connected through a transverse partition plate, so that the integral stability and the pressure bearing capacity of the bridge deck structure are favorably enhanced.

As the utility model discloses an optimal scheme, the transverse direction of I type roof beam along combination decking distributes, and the length extending direction of every I type roof beam sets up along the longitudinal direction of bridge promptly, convenient construction.

As the preferred scheme of the utility model, the steel bottom plate is the wave form, and the length direction of wave form sets up along the distribution direction of I type roof beam. The corrugated shape is beneficial to adhering and filling concrete, the concrete pouring amount is reduced, and the structure is lighter; meanwhile, the length direction of the corrugated shape is arranged along the distribution direction of the I-shaped beam, so that more acting points exist between the steel bottom plate and the I-shaped beam, and the stress performance of the steel bottom plate is better.

As the utility model discloses an optimal scheme, the steel bottom plate includes a plurality of pieces, and two adjacent I type roof beams are connected to every steel bottom plate, and transversely leave the clearance between the adjacent steel bottom plate, supply the concrete to fill, do benefit to the contact between enhancement decking and the I type roof beam.

As the utility model discloses an optimal scheme, the concrete is the thick C50 steel fiber concrete of 14 ~ 17cm, makes bridge floor high-strength high performance, the light-dutyization of structure.

The utility model provides an arch of building system suitable for stride the cantilever cast concrete arched bridge greatly based on above-mentioned bridge face girder construction, including stand, prestressing force bent cap and above-mentioned bridge face roof beam, prestressing force bent cap below and stand fixed connection, the bridge face roof beam is accepted on prestressing force bent cap upper portion, makes the whole light-dutyization of building system structure of hunch, promotes to stride footpath further development.

As the preferred scheme of the utility model, the stand is reinforced concrete box structure, and the stand inboard is equipped with the steel inner shell. The arrangement of the steel inner shell not only increases the anti-cracking performance and the torsional rigidity of the section of the concrete, but also can further avoid the arrangement of a partition plate in the upright column on the premise of ensuring the pressure bearing capacity of the upright column and reduce the wall thickness of the box chamber of the upright column; meanwhile, the steel inner shell can be used as an inner mold for column concrete construction, and the steel inner shell does not need to be taken out after forming, so that construction is convenient, and structure and construction light weight are realized.

As the utility model discloses an optimal scheme, the steel inner shell passes through the shear force nail to be connected with the stand concrete, strengthens the contact between steel inner shell and the stand, improves structural strength.

As the preferred scheme of the utility model, the steel inner shell is equipped with the chamfer, can effectively reduce chamfer local stress.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses a I type roof beam, ripples shaped steel-concrete combination decking technique, erect convenient, easy to maintain, the durability is good, can reduce engineering cost, and the steel-concrete combination roof beam weight of 30 meters span and the hoisting weight have compared traditional T roof beam and have reduced nearly 30%, and the application advantage to the light-duty of arched bridge deck roof beam is outstanding.

2. The utility model discloses a steel inner shell integrated configuration thin wall box stand can effectively alleviate the structure dead weight of high stand, for the reducible weight of conventional reinforced concrete box high stand about 28%. The steel inner shell not only increases the anti-cracking performance of concrete and the torsional rigidity of a cross section, avoids the arrangement of a partition plate in a column, but also reduces the wall thickness of a box chamber of the upright column, can be used as an inner mold for upright column concrete construction, does not need to be taken out after forming, is convenient to construct, and realizes structure and construction lightness.

3. The prestressed bent cap can greatly reduce the cross-sectional dimension of the bent cap, reduce the consumption of concrete materials, reduce the consumption of concrete by about 35 percent, simultaneously make the positive and negative bending moment reinforcement corresponding to the greatest extent and reduce the consumption of common reinforcements; the light prestressed capping beam reduces the concentrated force transmitted from the upright post to the arch ring, and can further enlarge the span of the main arch.

Drawings

Fig. 1 is a schematic cross-sectional structure of a bridge deck.

Fig. 2 is a schematic sectional view taken along the line a-a in fig. 1.

Fig. 3 is a schematic sectional view along the direction B-B in fig. 2.

Fig. 4 is an enlarged view of a portion I of fig. 1.

Fig. 5 is a schematic longitudinal sectional view of a composite deck slab.

FIG. 6 is a schematic structural view of a corrugated steel backing plate.

Fig. 7 is a schematic elevation view of an arch building system.

Fig. 8 is a schematic view of the cross-sectional structure of fig. 7 taken along the direction C-C (the bridge girder is omitted).

Fig. 9 is a side view of the structure of fig. 8.

Fig. 10 is a schematic view of the cross-sectional structure of fig. 8 taken along direction D-D.

Icon: 1-a bridge deck beam; 11-I beam; 12-composite deck slab; 121-steel bottom plate; 122-C50 steel fiber concrete; 13-diaphragm plate; 2-prestressed capping beam; 3-upright column; 31-inner steel shell; 32-shear pins; 33-chamfering.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

A bridge deck beam 1 suitable for a large-span cantilever casting concrete arch bridge is disclosed, as shown in figures 1-6, a steel-concrete composite beam is adopted, and comprises a composite bridge deck 12 and a plurality of I-shaped beams 11, wherein the upper parts of the I-shaped beams 11 are fixedly connected with the composite bridge deck 12, and the I-shaped beams 11 play a role in supporting; the combined bridge deck 12 comprises a steel bottom plate 121 and concrete 122, the steel bottom plate 121 is laid above the I-shaped beam 11, and C50 steel fiber concrete 122 with the thickness of 14-17 cm is cast on the steel bottom plate 121 in a cast-in-place mode. Wherein, the I-shaped beam 11 is prefabricated by C50 concrete and is 1.8m high; the thickness of the steel bottom plate 121 is 1cm, the height of the cast-in-place combined bridge deck 12 is 0.18m, and the total height of the bridge deck beam 1 is 1.98 m. The surface of the composite bridge deck 12 may be further paved with 7cm thick asphalt concrete 122, and guard rails are disposed on both sides.

Specifically, as shown in fig. 1 and 2, each I-shaped beam 11 is vertically arranged, and the length direction of each I-shaped beam 11 extends along the longitudinal direction of the bridge deck beam 1, i.e. the I-shaped beams 11 are distributed transversely; two adjacent I type roof beams 11 are through the transverse connection of cross slab 13, are equipped with wet seam on the cross slab 13, do benefit to the overall stability and the bearing capacity of reinforcing bridge deck plate structure. Each I-beam 11 may be an integral prefabricated structure, or may be formed by combining a plurality of I-beam unit segments according to the designed size of the bridge deck beam during construction (only a small section of the bridge deck beam is marked in fig. 3 to show the side structure), so as to facilitate construction.

As shown in fig. 5 and 6, the steel bottom plate 121 is corrugated, so that concrete can be adhered and filled in the corrugated steel bottom plate, the concrete pouring amount is reduced, and the structure is lighter; meanwhile, the length direction of the wave shape is arranged along the distribution direction (i.e. transverse direction) of the I-shaped beam 11, so that more acting points exist between the steel bottom plate 121 and the I-shaped beam 11, and the stress performance of the steel bottom plate 121 is better.

As shown in fig. 4, the steel bottom plate 121 includes a plurality of blocks, each block of steel bottom plate 121 connects two adjacent I-shaped beams 11, and a gap is laterally left between adjacent steel bottom plates 121 for concrete filling, which is beneficial to strengthen the connection between the bridge deck and the I-shaped beams 11.

The bridge deck beam concrete pouring weight and the hoisting weight of the steel-concrete composite beam with the span of 30 meters are reduced by nearly 30 percent compared with the traditional T beam, the engineering cost can be reduced, and the application advantage of lightening the bridge deck beam of the arch bridge is outstanding.

Example 2

Based on embodiment 1, this embodiment provides an arch building system suitable for large-span cantilever casting concrete arch bridge, as shown in fig. 7-10, including stand 3, T type section prestressing force bent cap 2 and above-mentioned bridge face roof beam 1, prestressing force bent cap 2 below is fixed connection with stand 3, and bridge face roof beam 1 is accepted to prestressing force bent cap 2 upper portion, makes arch building system structure whole lightweight, promotes span further development.

As shown in fig. 9, the prestressed capping beam 2 is designed into a concrete T-shaped section, the positive and negative bending moments are controlled to be close to each other as much as possible according to the full-prestress control design, and the reasonable prestressed steel bundles are configured according to the stress requirements in the construction stage and the operation stage, so that the optimal section size is determined to achieve the lightest capping beam weight, and the structure is lightened.

Along with the increase of span, the height of the arch upright post needs to be increased in the cantilever pouring concrete arch bridge. In this embodiment, in order to adapt the high vertical columns to the large-span arch bridge structure, for the high vertical columns with a height greater than 40m, thin-wall box-type vertical columns with steel inner shells combined structure are adopted, i.e. the vertical columns 3 are designed into reinforced concrete box-type structure, as shown in fig. 8 and 10, thin-wall steel inner shells 31 are arranged on the inner sides of the box chambers of the vertical columns 3, and the steel inner shells 31 can be connected with the concrete 122 of the vertical columns 3 through shear pins 32. Wherein, the thickness of the steel inner shell 31 is 8mm-10mm, and the wall thickness of the 3 upright post chambers is 30 mm; the steel inner shell 31 is provided with a chamfer 33 with the width of 30cm multiplied by 30cm, and the local stress of the chamfer 33 can be effectively reduced. The arrangement of the steel inner shell not only increases the crack resistance of concrete and the torsional rigidity of the section, but also reduces the wall thickness of the box chamber, avoids the arrangement of a partition plate in the column and reduces the pouring weight of the concrete of the upright column; meanwhile, the steel inner shell can be used as an inner mold for column concrete construction, and the steel inner shell does not need to be taken out after forming, so that construction is convenient, and the structure and construction are further lightened.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The bridge deck beam (1) suitable for the large-span cast-in-place concrete arch bridge is characterized by comprising a combined bridge deck (12) and a plurality of I-shaped beams (11), wherein the I-shaped beams (11) are used for supporting the combined bridge deck (12), all the I-shaped beams (11) are distributed along the transverse direction of the combined bridge deck (12), and the length extension direction of each I-shaped beam (11) is arranged along the longitudinal direction of the bridge; the combined bridge deck (12) comprises a steel bottom plate (121) and concrete, the steel bottom plate (121) is laid above the I-shaped beam (11), and the concrete is arranged above the steel bottom plate (121).

2. The bridge deck beam (1) suitable for the large-span cast-in-place-in-cantilever concrete arch bridge according to claim 1, wherein each I-shaped beam (11) is vertically arranged, and two adjacent I-shaped beams (11) are connected through a diaphragm (13).

3. The bridge deck beam (1) suitable for the long-span cast-in-place concrete arch bridge according to claim 1, wherein the steel bottom plate (121) is corrugated, and the length direction of the corrugated shape is arranged along the distribution direction of the I-shaped beam (11).

4. The bridge deck beam (1) suitable for the large-span cast-in-place-in-cantilever concrete arch bridge according to claim 3, wherein the steel bottom plate (121) comprises a plurality of blocks, each block of the steel bottom plate (121) is connected with two adjacent I-shaped beams (11), and a gap is transversely reserved between the adjacent steel bottom plates (121) for filling the concrete.

5. A bridge deck beam (1) suitable for a long-span cast-in-place concrete arch bridge according to any one of claims 1 to 4, wherein the concrete is C50 steel fiber concrete (122) with the thickness of 14-17 cm.

6. An arch building system suitable for a large-span cast-in-place concrete arch bridge, which is characterized by comprising upright columns (3), prestressed capping beams (2) and the bridge deck beam (1) according to any one of claims 1 to 5, wherein the lower parts of the prestressed capping beams (2) are fixedly connected with the upright columns (3), and the upper parts of the prestressed capping beams (2) are used for bearing the bridge deck beam (1).

7. The arch building system suitable for the long-span cast-in-cantilever concrete arch bridge of claim 6, wherein the upright column (3) is a reinforced concrete box-type structure, and the inner side of the upright column (3) is provided with a steel inner shell (31).

8. The arch building system suitable for the long-span cast-in-place concrete arch bridge of claim 7, wherein the steel inner shell (31) is connected with the column concrete through shear nails (32).

9. The arch building system suitable for the long-span cast-in-place concrete arch bridge of claim 7, wherein the inner steel shell (31) is provided with a chamfer (33).

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