CN209779469U

CN209779469U - Widening and reforming structure of continuous box girder bridge

Info

Publication number: CN209779469U
Application number: CN201920198419.0U
Authority: CN
Inventors: 黄华华; 李量; 蔡冬军; 刘鹏飞
Original assignee: Intermediate Engineering Consulting (chongqing) Co Ltd
Current assignee: Intermediate Engineering Consulting (chongqing) Co Ltd
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2019-12-13
Anticipated expiration: 2029-02-14

Abstract

The utility model discloses a transformation structure is widened to continuous box girder bridge, including two light-duty abutments that are located the bridge both ends, array distribution at the column type mounds between two light-duty abutments and support the box girder on column type mounds and light-duty abutments, the box girder includes supporting part and the existing bridge floor of shaping at the supporting part upside, and wherein the supporting part supports column type mound and light-duty abutments upper end, the bilateral symmetry of existing bridge floor are equipped with the newly-built cantilever of outside extension, the lower surface and the both sides of supporting part all bond and have the steel sheet, and the supporting part is equipped with horizontal stopper in corresponding column type mound position, and horizontal stopper symmetric distribution is in the both sides of column type mound along box girder width direction. The utility model has the advantages that: the method can better meet the requirement of widening and reforming the existing ramp bridge and has higher popularization and application values.

Description

Widening and reforming structure of continuous box girder bridge

Technical Field

The utility model belongs to the technical field of the bridge construction, concretely relates to transformation structure is widened to continuous box girder bridge.

Background

Continuous box girder bridges are commonly used in overpass ramp sections, i.e. secondary junction sections for access to main lines, usually providing a short section of road for vehicles to access bridges, tunnels, highways, auxiliary roads of elevated roads, or land bridges, chutes, lead lines of other main lines.

At present, the quantity of vehicles on a vehicle is gradually increased, the demand of roads is more and more great, including the demand on ramp bridges, and many built ramp bridges do not consider too large carrying demand at the beginning of design, so that many existing ramp bridge bridges cannot meet the demand of traffic transportation, and thus many ramp bridges are in urgent need of expansion and widening.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a transformation structure is widened to continuous box girder bridge can satisfy existing ramp bridge betterly and widen the demand of reforming transform, has higher popularization and application and worth.

In order to achieve the above purpose, the utility model discloses technical scheme as follows:

The utility model provides a continuous box girder bridge widens and reforms transform structure, includes two light-duty abutments that are located the bridge both ends, the column pier of array distribution between two light-duty abutments and supports the box girder on column pier and light-duty abutment, the box girder includes the existing bridge floor of support part and shaping at the support part upside, and wherein the support part supports column pier and light-duty abutment upper end, and its key lies in: the bilateral symmetry of existing bridge floor is equipped with the newly-built cantilever of outside extension, the lower surface and the both sides of support part all bond and have the steel sheet, and the support part is being equipped with horizontal stopper corresponding column pier position, and horizontal stopper symmetric distribution is in column pier along the both sides of case roof beam width direction.

By adopting the structure, on the basis of the existing ramp bridge, the extension and widening of the existing ramp can be completed by additionally arranging the reinforcing steel plates on the supporting parts, additionally arranging the transverse limiting blocks on two sides of the column type piers and additionally arranging the newly-built cantilevers on two sides of the existing bridge floor, and in the process of improving and widening the ramp, the existing ramp is less to be dismantled, the plane linearity, the span and the elevation of the original bridge can be reserved, the construction is easy, mechanical indexes such as bending resistance, shearing resistance, torsion resistance and the like of each link can be met, the requirement of expanding and reforming the existing ramp bridge can be met, and the popularization and application values are high.

Preferably, the method comprises the following steps: the existing bridge deck comprises a first link, a second link and a third link which are sequentially connected. By adopting the structure, the requirement of construction length can be ensured.

preferably, the method comprises the following steps: the first connection is provided with the weight blocks at the branch connection pier and the light bridge abutment, and the weight blocks at the two positions are located on the same side of the first connection. By adopting the structure, the bearing capacity of the improved back ramp can be improved.

Preferably, the method comprises the following steps: the steel plate arrays are distributed on the lower surface and both sides of the supporting part.

preferably, the method comprises the following steps: and a protective guard is arranged on the edge of the newly-built cantilever. By adopting the structure, the vehicle can be protected.

Preferably, the method comprises the following steps: the upper surfaces of the existing bridge deck and the newly-built cantilever are paved by medium-grain asphalt.

Compared with the prior art, the beneficial effects of the utility model are that:

adopt the utility model provides a continuous box girder bridge widens and reforms transform structure carries out the in-process that the improvement was widened to the ramp bridge, and is less to demolising of existing ramp, can remain the plane linearity, stride footpath and the elevation of original bridge, and easily construction can satisfy each and allies oneself with mechanical index such as bending resistance, shearing, antitorque, can satisfy the existing ramp bridge and widen the demand of reforming transform, has higher popularization and application and worth.

Drawings

FIG. 1 is a schematic cross-sectional view of a ramp bridge;

FIG. 2 is a side view of a ramp bridge;

FIG. 3 is a schematic view of a stud pier limiting structure;

FIG. 4 is a schematic view showing the distribution of the pitch of the supports;

FIG. 5 is a schematic plan view of an existing deck;

FIG. 6 is a schematic view of the distribution of the weight elements;

FIG. 7 is a schematic view of a portion of a steel plate distribution;

FIG. 8 is a schematic cross-sectional view of a reactive ballast mass structure.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

As shown in fig. 1, 2 and 3, a continuous box girder bridge widening and reforming structure includes two light-weight abutments 2 at both ends of a bridge, pillar piers 1 arrayed between the two light-weight abutments 2, and a box girder a supported on the pillar piers 1 and the light-weight abutments 2, the box girder a including a support part 3 and an existing bridge deck 4 formed on an upper side of the support part 3, wherein the support part 3 is supported on the pillar piers 1 and the light-weight abutments 2, and is characterized in that: the bilateral symmetry of existing bridge floor 4 is equipped with newly-built cantilever 5 of outside extension, the lower surface and the both sides of supporting part 3 all bond and have steel sheet 6, and supporting part 3 is equipped with horizontal stopper 7 corresponding column type mound 1 position, and 7 symmetric distributions of horizontal stopper are in column type mound 1 along the both sides of case roof beam A width direction.

On the basis of the existing ramp, the extension and the widening of the existing ramp can be completed by additionally arranging a reinforcing steel plate 6 on the supporting part 3, transversely limiting blocks 7 on two sides of the column pier 1 and newly-built cantilevers 5 on two sides of the existing bridge floor 4. In fig. 1, L1 is the original ramp width, and L2 is the widened ramp width.

As shown in fig. 4, to improve the load-bearing capacity of the modified ramp, the support section 3 is mounted on the lightweight abutment 2 by means of the existing abutment 8 after the adjustment of the spacing, in this embodiment the spacing of the abutment 8 at the abutment is adjusted from 2.8m to 5.2m, 8a in the figure representing the original position of the abutment 8.

As shown in fig. 5, to meet the requirement of building length, the existing deck 4 includes a first link 4a, a second link 4b and a third link 4c which are connected in sequence.

As shown in fig. 6 and 8, in order to ensure the bearing capacity of the post-expansion ramp, the first block 4a is provided with a weight 9 at the position of the block f and at the position of the light abutment 2, the weight 9 is poured on the lower side of the newly-built cantilever 5, and the two weights 9 are located on the same side of the first block 4a, in this embodiment, the weight 9 at the position of the block f is 10m long, and the weight 9 at the position of the light abutment 2 is 15m long. The branch connection pier f refers to a column type pier 1 at the junction of two adjacent connection piers.

as shown in fig. 1, guard rails 10 are arranged on the edges of the newly-built cantilevers 5.

As shown in fig. 7, the steel plates 6 are attached to the lower surface and both sides of the supporting part 3 at equal intervals, and the attaching of the steel plates 6 includes the following processes: chiseling surface mortar in a bonding area to expose concrete aggregate and form a flat rough surface, removing surface laitance by using a steel wire wheel, removing surface loose objects, and finally blowing surface dust by using an air gun; and a second step: drilling and implanting expansion bolts: the expansion bolt screw rod is implanted according to the design drawing, before drilling, the distribution of the steel bars of the beam body is found out according to the drawing, the steel bars or the prestressed pipeline are prevented from being hit during drilling, the diameter and the depth of the blind hole are constructed according to the design drawing, the drilled blind hole is cleaned from the hole bottom to the outside of the hole by compressed air, then a layer of thin epoxy resin base liquid is coated, two-thirds of the depth of the hole epoxy structure adhesive is injected into the blind hole, then the expansion bolt screw rod coated with a layer of epoxy resin base liquid grout is slowly rotated and inserted, and then the epoxy structure adhesive is filled to fill the hole opening to fill the hole. And a third step of: according to the distribution spacing of expansion bolts, the steel plate 6 is punched in a matched manner, then the adhesive surface of the steel plate 6 is subjected to rust removal and rough treatment, the rough treatment requires that the polishing lines are vertical to the stress direction of the steel plate 6, and finally the adhesive surface of the steel plate 6 is wiped clean by industrial acetone; step four: respectively coating a layer of epoxy resin adhesive on the surface of the concrete and the adhesive surface of the steel plate 6, then adhering the steel plate 6 on the surface of the concrete, and finally fastening and connecting by using a nut; when fastening, the nuts are alternately screwed, so that redundant epoxy resin glue is extruded out along the plate seam to achieve the close adhesion degree; and a fifth step: curing inspection and antiseptic treatment, wherein the inspection means is as follows: the sticking steel plate 6 is lightly tapped by a small hammer, the sticking curing effect is judged by sound, and if the sticking curing area of the steel plate 6 is found to be less than 90%, the sticking steel plate 6 is invalid and should be peeled off for re-sticking.

as shown in FIG. 3, the arrangement of the lateral limiting block 1 can enhance the lateral stability of the upper structure A to reduce the shaking.

when a newly-built cantilever 5 is additionally arranged, an existing bridge deck 4 with the width of 40cm is firstly removed, construction is conducted in a longitudinal and transverse symmetrical mode during removal, namely the construction is conducted symmetrically from the middle point of a midspan to two ends, existing reinforcing steel bars are exposed, then the reinforcing steel bars of the newly-built cantilever 5 are connected with the existing reinforcing steel bars in a welding mode, then a support and a formwork are erected, and finally concrete is poured.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.

Claims

1. The utility model provides a continuous box girder bridge widens and reforms transform structure, includes two light-duty abutments (2) that are located the bridge both ends, column pier (1) that the array distributes between two light-duty abutments (2) and supports case roof beam (A) on column pier (1) and light-duty abutment (2), case roof beam (A) is including supporting part (3) and shaping existing bridge floor (4) at supporting part (3) upside, and wherein supporting part (3) support is in column pier (1) and light-duty abutment (2) upper end, its characterized in that: the bilateral symmetry of existing bridge floor (4) is equipped with newly-built cantilever (5) of outside extension, the lower surface and the both sides of supporting part (3) all bond and have steel sheet (6), and supporting part (3) are equipped with horizontal stopper (7) in corresponding column type mound (1) position, and horizontal stopper (7) symmetric distribution is in column type mound (1) along case roof beam (A) width direction's both sides.

2. the continuous box girder bridge widening and reforming structure according to claim 1, wherein: the existing bridge deck (4) comprises a first coupling (4a), a second coupling (4b) and a third coupling (4c) which are sequentially connected.

3. The continuous box girder bridge widening and reforming structure according to claim 2, wherein: the first connection (4a) is provided with the weight blocks (9) at the connection pier (f) and the light bridge abutment (2), and the weight blocks (9) at the two positions are positioned at the same side of the first connection (4 a).

4. The continuous box girder bridge widening and reconstruction structure according to claim 1, 2 or 3, wherein: the steel plates (6) are distributed in an array on the lower surface and on both sides of the support part (3).

5. The continuous box girder bridge widening and reforming structure according to claim 1, wherein: and a protective guard (10) is arranged on the edge of the newly-built cantilever (5).

6. The continuous box girder bridge widening and reforming structure according to claim 1, wherein: the upper surfaces of the existing bridge deck (4) and the newly-built cantilever (5) are paved by medium-grain asphalt.