CN210288135U - Device for reducing height of support of cast-in-situ box girder of bridge - Google Patents

Abstract

The utility model discloses a cast-in-place box girder of bridge reduces device of support height, including mixing earth pier, bracket support, crossbeam bailey roof beam, vertical distribution roof beam and top support, it has buried a plurality of reinforcing bars underground to mix earth pier lower part, the reinforcing bar front end reveals outside mixing the earth pier and is connected with the bracket support, the bracket supports the upper end and is connected with crossbeam bailey roof beam and longeron bailey roof beam, crossbeam bailey roof beam and longeron bailey roof beam upper end all are provided with a plurality of vertical distribution roof beams, and vertical distribution roof beam upper end supports jointly and is connected with the top and holds in the palm. The utility model discloses rational in infrastructure, the practicality is high, sets up the height for reducing the support, reduces the support and sets up the process, refers to the principle of wearing group in the bent cap construction, and at the fulcrum of pier stud take the highly pre-buried bracket as the upper portion support, carries out the checking calculation to bracket and pier stud according to the load in the superstructure construction, under the prerequisite of guaranteeing safety, utilizes the bracket to reduce the work load that the support set up and demolish, has reduced the support aspect ratio, has guaranteed support construction safety.

Description

Device for reducing height of support of cast-in-situ box girder of bridge

Technical Field

The utility model belongs to the technical field of bridge construction equipment, especially, relate to a cast-in-place box girder of bridge reduces device of support height.

Background

The cast-in-place continuous box girder structure is widely applied to bridge engineering and has a series of advantages, such as attractive line shape, few telescopic joints, low deformation coefficient and the like. In recent years, as the construction technology of cast-in-place continuous box girders is rapidly developed, the cast-in-place continuous box girders become one of main bridge types in bridge construction. Aiming at the bridge type, corresponding construction methods such as a full framing method, a steel pipe column Bailey beam framing method, a hanging basket construction method and the like are also developed, wherein the full framing method is the most common construction method for the cast-in-place box beam at present. The application of the full framing has produced the impetus effect to cast-in-place box girder construction, also is the basic link of engineering simultaneously, consequently, strengthens the degree of attention to the full framing application, will be to improving construction safety, guarantees construction quality and has the significance.

At present, the full framing method is generally suitable for the construction of cast-in-place box girders with the height lower than 20m, and is particularly suitable for the construction of multi-span cast-in-place girders, but the biggest defects of the full framing method are that the consumption of the framing required by the construction is large, the erection period of the framing is long, and the full framing method has great limitations particularly on mountainous bridges (with large terrain variation) and high piers. In order to overcome the defects of the full framing method, a construction method of the steel pipe column Bailey beam framing method is derived, and although the construction method overcomes the defects of the traditional full framing method, the construction method has high requirements on the steel pipe column foundation treatment and labor are wasted in the foundation treatment. Therefore, the technical personnel in the field provide a device for reducing the height of a bracket of a cast-in-place box girder of a bridge, so as to solve the problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cast-in-place box girder of bridge reduces device of support height aims at solving the problem that prior art exists among the above-mentioned background art.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a cast-in-place box girder of bridge reduces device of support height, supports, crossbeam bailey roof beam, vertical distribution roof beam and top including muddy earth pier, bracket, a plurality of reinforcing bars have been buried underground in muddy earth pier lower part, the reinforcing bar front end exposes outside muddy earth pier and is connected with the bracket and supports, the bracket supports the upper end and is connected with crossbeam bailey roof beam and longeron bailey roof beam through fastening nut, crossbeam bailey roof beam and longeron bailey roof beam upper end all are provided with a plurality of vertical distribution roof beams, vertical distribution roof beam upper end supports jointly and is connected with the top and holds in the palm.

Preferably, the bracket supports including backplate, roof and web, the backplate top sets up the roof, backplate front end left and right sides symmetry sets up the web, the web upper end is connected with the roof, reserve the hole of a plurality of installation reinforcing bars on the backplate.

Preferably, a plurality of rib plates are arranged on the inner back plate of the bracket support.

Preferably, the back plate, the top plate, the web plate and the rib plate are all made of steel plates, the thickness of the back plate is 3cm, and the thickness of the rib plate and the thickness of the top plate are 2 cm.

Preferably, the crossbeam bailey beam and the longitudinal beam bailey beam both adopt double-row single-layer reinforced 321 type bailey beams.

Preferably, the longitudinal distribution beam is I16I-shaped steel.

Preferably, the upper end of the jacking is connected with a construction channel through a fastening nut.

Compare in prior art's shortcoming and not enough, the utility model discloses following beneficial effect has: the utility model has the advantages of reasonable design structurally, the practicality is very high, in operation, set up the height in order to reduce the support, reduce the process of setting up by the support, refer to the principle of wearing group in the bent cap construction, at the fulcrum of pier stud take the highly pre-buried bracket as the upper portion support, load according to in the superstructure construction carries out the checking calculation to bracket and pier stud, under the prerequisite of guaranteeing safety, utilize the bracket to reduce the work load that the support set up and demolishd, the device has reduced the support aspect ratio, has guaranteed support construction safety.

Drawings

Fig. 1 is the utility model provides a cast-in-place box girder of bridge reduces device of support height's schematic structure view.

Fig. 2 is a schematic structural view of a corbel support provided by an embodiment of the present invention.

Fig. 3 is a cross-sectional view at a-a in fig. 2.

Fig. 4 is a cross-sectional view at B-B in fig. 2.

In the figure: 1. concrete pier, 2, bracket support, 201, back plate, 202, top plate, 203, web, 204, ribbed slab, 3, crossbeam bailey beam, 4, longitudinal distribution beam, 5, jacking, 6 and reinforcing steel bar.

Detailed Description

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 merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a cast-in-place box girder of bridge reduces device of support height, including mixing earth pier 1, the bracket supports 2, crossbeam bailey roof beam 3, vertical distribution roof beam 4 and top support 5, mix 1 lower part of earth pier and bury a plurality of reinforcing bars 6 underground, 6 front ends of reinforcing bar expose in mixing earth pier 1 outside and be connected with the bracket and support 2, 2 upper ends of bracket support are connected with crossbeam bailey roof beam 3 and longeron bailey roof beam through fastening nut, crossbeam bailey roof beam 3 and longeron bailey roof beam upper end all are provided with a plurality of vertical distribution roof beams 4, 4 upper ends of vertical distribution roof beam support jointly and be connected with top support 5, top support 5 upper end is connected with the construction passageway through fastening nut.

The structure of the corbel support 2 is shown in fig. 2-4, the corbel support 2 comprises a back plate 201, a top plate 202 and a web plate 203, the top of the back plate 201 is provided with the top plate 202, the web plate 203 is symmetrically arranged on the left side and the right side of the front end of the back plate 201, the upper end of the web plate 203 is connected with the top plate 202, and a plurality of holes for installing the reinforcing steel bars 6 are reserved on the back plate 201; the back board 201 in the bracket support 2 is also provided with a plurality of ribbed plates 204. In specific application, the back plate 201 is a 3cm thick steel plate, the size of the back plate is 70cm multiplied by 90cm, holes are punched according to the distance of 13cm multiplied by 17cm and the aperture of 32mm, and the holes are used for installing the bracket support 2 in the later period; the rib plates 204 and the top plate 202 are made of 2cm steel plates, the web plates 203 and the back plate 201 are welded through groove welding, and the height of a welding line is 8mm, so that stress of the bracket is guaranteed.

The utility model discloses a construction method does:

(1) measuring and lofting: through measuring the lofting, when the construction of concrete pier 1, according to the pre-buried bracket support 2 of the elevation of bracket support 2 of confirming in advance.

(2) Pre-embedding bracket support: according to the measured height of the standard, the bracket support 2 is embedded in an M30 high-strength bolt opposite pulling mode.

(3) Erecting a beam Bailey beam: a cross beam Bailey beam 3 and a longitudinal beam Bailey beam are arranged on a top plate 202 of the bracket support 2, and the cross beam Bailey beam 3 adopts a double-row single-layer reinforced 321-type Bailey beam. Before installation, retest is carried out to the elevation of bracket support 2, if the elevation of bracket support 2 is inconsistent, adopts the steel sheet to adjust, guarantees that vertical distribution beam 4 tends to the level. During installation, the hoops are adopted to fix the longitudinal distribution beams 4 on the concrete bridge piers 1 or fix the longitudinal distribution beams 4 in a mode that the Bailey beams on two sides of the concrete bridge piers 1 are pulled oppositely.

(4) Erecting a longitudinal beam Bailey beam: the longitudinal beams are double-row single-layer reinforced 321-type Bailey beams and are arranged at intervals of 45 cm.

(5) And (3) erecting a longitudinal distribution beam: the longitudinal beam Bailey beam is taken as a support foundation, the longitudinal distribution beam 4 is arranged on the top of the longitudinal beam Bailey beam according to the step pitch of the vertical rods of the support, and the longitudinal distribution beam 4 is made of I16I-steel.

(6) Erecting a support: the erection of the bracket is started according to the erection step of the bracket, but attention needs to be paid, when the I-shaped steel is adopted as the distribution beam, the bracket bottom support needs to be replaced by the jacking support, and the jacking support needs to be fastened with the longitudinal distribution beam 4, so that the construction safety is ensured.

The utility model discloses a theory of operation is:

the utility model relates to a device for reducing the height of a support of a bridge cast-in-place box girder, during operation, in order to reduce the height of the support, the process of the support construction is reduced, according to the principle of the upper part of the bent cap construction, a bracket is embedded at a certain height of a pier stud as a fulcrum of an upper support, the bracket and the pier stud are checked according to the load in the upper structure construction, on the premise of ensuring safety, the bracket is utilized to reduce the workload of the support construction and the removal, the device reduces the height-width ratio of the support, and the safety of the support construction is ensured; the device reduces the height and the volume of the support erection, the Bailey beams are assembled in advance, and the Bailey beams can be integrally special after the assembly is completed, so that the workload of the support erection is greatly reduced, and the time for the support erection is reduced by 60%; the problem of in the mountain area bridge construction process, the topography changes greatly, full hall support sets up the difficulty is solved. When setting up full hall support in mountain area, its ground treatment often is along with step excavation and step protection, its ground treatment expense is too big, adopt the device, the very big construction cost that has saved, it can't satisfy and support height is too big back because of the too big problem of support collet position atress that arouses of support dead weight in the cast-in-place box girder construction of high mound (more than 30 m) to have solved, because of the restriction of construction site, the problem that the support lower part needs the traffic, compare with steel-pipe column bailey beam support method, the device need not to carry out ground treatment, the ground treatment expense has been reduced, the required material of the device is few, the steel-pipe column compares, the device need not to transport, and the purchase (lease) steel-pipe column expense takes place, very big reduction construction cost.

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 (7)

1. The utility model provides a cast-in-place box girder of bridge reduces device of support height, its characterized in that, supports, crossbeam bailey roof beam, vertical distribution roof beam and top including muddy earth pier, bracket, a plurality of reinforcing bars have been buried underground in muddy earth pier lower part, the reinforcing bar front end exposes outside muddy earth pier and is connected with the bracket and supports, the bracket supports the upper end and is connected with crossbeam bailey roof beam and longeron bailey roof beam through fastening nut, crossbeam bailey roof beam and longeron bailey roof beam upper end all are provided with a plurality of vertical distribution roof beams, vertical distribution roof beam upper end supports jointly and is connected with the top and holds in the palm.

2. The device for reducing the height of the support of the bridge cast-in-place box girder of claim 1, wherein the bracket support comprises a back plate, a top plate and a web plate, the top of the back plate is provided with the top plate, the web plate is symmetrically arranged on the left side and the right side of the front end of the back plate, the upper end of the web plate is connected with the top plate, and a plurality of holes for installing reinforcing steel bars are reserved on the back plate.

3. The device for reducing the height of the support of the bridge cast-in-place box girder as claimed in claim 2, wherein a plurality of ribbed plates are arranged on the inner back plate of the bracket support.

4. The device for reducing the height of the support of the bridge cast-in-place box girder of claim 3, wherein the back plate, the top plate, the web plate and the rib plate are all made of steel plates, the thickness of the back plate is 3cm, and the thickness of the rib plate and the thickness of the top plate are both 2 cm.

5. The device for reducing the height of the support of the bridge cast-in-place box beam is characterized in that the transverse beam Bailey beam and the longitudinal beam Bailey beam are double-row single-layer reinforced 321-type Bailey beams.

6. The apparatus for reducing the height of the support frame of the bridge cast-in-place box girder of claim 1, wherein the longitudinal distribution beam is I16I-shaped steel.

7. The device for reducing the height of the support of the bridge cast-in-place box girder of claim 1, wherein the upper end of the jacking is connected with a construction channel through a fastening nut.

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