CN214401459U

CN214401459U - Be applicable to mountain area highway simply supported beam bridge assembled reinforced structure

Info

Publication number: CN214401459U
Application number: CN202023059975.1U
Authority: CN
Inventors: 伏冠西; 陶龙; 冉师齐; 周咏凯; 何贵德; 李俊威; 袁晶潞; 魏圣
Original assignee: SICHUAN ROAD AND BRIDGE HUADONG CONSTRUCTION CO Ltd
Current assignee: SICHUAN ROAD AND BRIDGE HUADONG CONSTRUCTION CO Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-10-15
Anticipated expiration: 2030-12-18

Abstract

The utility model discloses an assembled reinforcing structure suitable for mountain highway simply supported girder bridges; the fabricated reinforcement structure includes: the device comprises a supporting foundation, a supporting bent, a leveling steel box and a support; the lower end of the supporting bent is fixed on a supporting foundation, the upper end of the supporting bent supports the leveling steel box, and the support is located on the leveling steel box. The reinforcing structure and the method can solve the problems of relative dislocation of the upper part and the lower part, displacement and void of the support, low and tight beam body, arch camber of the bridge floor, large-range cracking of pile columns, tie beams and capping beams and other bridge integrity problems of a simply supported beam bridge in a mountainous area. Through set up support basis, support framed bent, leveling steel case and support beside the pier stud, make old bridge have stronger stability, bearing capacity and reinforcement function, can improve the wholeness ability of old bridge, prolong old bridge life greatly, be fit for promoting.

Description

Be applicable to mountain area highway simply supported beam bridge assembled reinforced structure

Technical Field

The utility model relates to a relevant technical field of highway construction, what specifically say is related to is a simple beam bridge assembled reinforced structure suitable for mountain area highway.

Background

With the development of economy in China, traffic construction is greatly developed, mountainous bridges are increasingly increased, and among the mountainous bridges, many simple and straight bridges exist. The traffic volume is increasing day by day, the vehicle that overloads constantly appears, and the bridge load increases weight day by day, and the limitation of mountain area geology topographic condition, geological disaster problem are outstanding, and various diseases can appear in the simple straight beam bridge in mountain area, and the disease is not local, but wholeness, such as the relative dislocation of bridge upper and lower portion, support shift, the sky, the roof beam body is low tight, the bridge floor arch camber, pile column and tie beam, bent cap fracture etc.. For such global diseases that arise from old bridges, there are two main current solutions: firstly, new lines are built, and secondly, the bridge is reinforced.

The construction of new lines is high in cost and long in construction period, and can block traffic, so that the economic operation is not facilitated. The reinforcing treatment of the old bridge can recover the bearing capacity of the old bridge, prolong the service life and is beneficial to the smooth blood vessels running economically. However, the existing bridge reinforcing technology, such as a section increasing method adopted by pier column reinforcement, a concrete pouring method in a steel sleeve, a fiber composite material or steel plate pasting method and the like, has certain limitations, can only solve the problem of local diseases such as insufficient pier column bearing capacity, can not be used for other diseases such as support displacement, support vacancy, beam body support and the like, and has the disadvantages of high implementation difficulty, long construction period, large influence on the existing traffic and the like.

Aiming at the overall problem of the simply supported beam bridge on the mountain highway, an effective reinforcement treatment method is not provided at present, so that the rapid and efficient reinforcement method is urgent to treat the overall problem of the simply supported beam bridge on the mountain highway.

SUMMERY OF THE UTILITY MODEL

Therefore, in order to solve the above-mentioned deficiencies, the utility model provides an assembled reinforced structure suitable for mountain highway simply supported girder bridge herein; the reinforcing structure can solve the problems that the upper part and the lower part of a simply supported girder bridge in a mountain area are relatively staggered, a support is shifted and is empty, a girder body is low and tight, a bridge deck is arched, and pile columns, tie beams and capping beams are cracked on a large scale and the like. Through set up support basis, support framed bent, leveling steel case and support beside the pier stud, make old bridge have stronger stability, bearing capacity and reinforcement function, can improve the wholeness ability of old bridge, prolong old bridge life greatly, be fit for promoting.

The utility model is realized in such a way, an assembled reinforcing structure suitable for the mountain highway simply supported girder bridge is constructed, which is characterized in that; the fabricated reinforcement structure includes: the device comprises a supporting foundation, a supporting bent, a leveling steel box and a support; the lower end of the supporting bent is fixed on a supporting foundation, the upper end of the supporting bent supports the leveling steel box, and the support is located on the leveling steel box.

According to the utility model, the simple-supported beam bridge assembled reinforced structure suitable for mountain roads is characterized in that; aiming at the characteristics of complex terrain and surface conditions, steep longitudinal and transverse gradients, loose soil quality of covering layers, poor stability and the like of mountainous areas, the support foundation adopts a form of an enlarged foundation and a steel pipe cast-in-place pile; the arrangement of the enlarged foundation corresponding to each steel pipe upright on the support bent is 2.5M multiplied by 2M, each enlarged foundation is provided with 3 rows of 9 steel pipe cast-in-place piles, the steel pipes are phi 140 multiplied by 8mm seamless galvanized anti-corrosion steel pipes, and grouting materials are M30 cement mortar.

According to the utility model, the simple-supported beam bridge assembled reinforced structure suitable for mountain roads is characterized in that; the horizontal bridge-to-middle distance of the vertical columns of the support bent frames is 5m, the longitudinal bridge-to-middle distance of each row is 2m from the axis of the pier, the vertical columns adopt phi 820 multiplied by 12mm steel pipes, and C40 self-compacting micro-expansion concrete is poured into the steel pipes; one transverse strut is arranged between every two upright columns at intervals of 4m, and the transverse strut is made of a phi 325 multiplied by 6mm steel pipe; 3I 56b I-shaped steel beams are horizontally arranged at the top as cross beams; the bottom ends of the upright columns of the supporting bent frames are connected with the foundation, the top ends of the upright columns are connected with the cross beam, and the upright columns are connected with the cross beam through flanges.

According to the utility model, the simple-supported beam bridge assembled reinforced structure suitable for mountain roads is characterized in that; the support bent frame is provided with a leveling steel box to adapt to a bridge deck cross slope, the leveling steel box is formed by welding a steel plate and a phi 820 multiplied by 12mm steel pipe, and M30 cement mortar is poured into the leveling steel box.

According to the utility model, the simple-supported beam bridge assembled reinforced structure suitable for mountain roads is characterized in that; the support adopts a plate type rubber support, and the specification is GJZ250 multiplied by 500 multiplied by 52 mm.

The utility model has the advantages of as follows: the patent has the following advantages and beneficial effects; (1) the reinforcing structure and the reinforcing method make up for the reinforcing technology aiming at the integral damage of the simply supported girder bridge in the mountainous area. By the structure and the method, the mountain simple and straight girder bridge can be effectively reinforced, the integral reliability of the bridge is improved, the bearing capacity is improved, the service life of the bridge is greatly prolonged, and the bridge can be widely popularized and applied to mountain simple and straight girder bridge reinforcing engineering; (2) the supporting bent and the leveling steel box in the reinforced structure can be transported to the site for installation after being processed and molded in a factory, and the assembly adopts a high-strength bolt connection mode, so that the site welding workload is small, the construction efficiency is high, the operation is simple and convenient, and the construction quality reliability is high.

Drawings

Fig. 1-2 are schematic diagrams of the reinforced structure according to the present invention.

Wherein: the support comprises a support foundation 10, a support bent 20, a leveling steel box 30 and a support 40.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings 1-2, wherein the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides an assembly type reinforcing structure suitable for a simply supported beam bridge of a mountain road through improvement, as shown in figures 1-2; this can be implemented as follows; the fabricated reinforced structure includes a support foundation 10, a support bent 20, a leveling steel box 30, and a support 40.

During implementation, the support foundation 10 adopts the form of an enlarged foundation and a steel pipe cast-in-place pile aiming at the characteristics of complex terrain and surface conditions, steep longitudinal and transverse gradients, loose soil quality of a covering layer, poor stability and the like in mountainous areas. The arrangement of the enlarged foundation corresponding to each steel tube upright on the support bent 20 is 2.5M multiplied by 2M, each enlarged foundation is provided with 3 rows of 9 steel tube cast-in-place piles, the steel tubes adopt phi 140 multiplied by 8mm seamless galvanized anti-corrosion steel tubes, and grouting materials adopt M30 cement mortar.

During implementation, the transverse bridge of the bent upright posts is spaced from the middle of the pier by 5m, and each longitudinal bridge is spaced from the axis of the pier by 2 m. The upright posts are made of phi 820 multiplied by 12mm steel pipes, and C40 self-compacting micro-expansion concrete is poured into the steel pipes; one transverse strut is arranged between every two upright columns at intervals of 4m, and the transverse strut is made of a phi 325 multiplied by 6mm steel pipe; 3I 56b I-shaped steel beams are horizontally arranged at the top as cross beams. The bottom ends of the upright columns of the supporting bent frames are connected with the foundation, the top ends of the upright columns are connected with the cross beam, and the upright columns are connected with the cross beam through flanges.

In the implementation, the support bent frame 20 is provided with the leveling steel box 30 to adapt to the cross slope of the bridge floor, the leveling steel box is formed by welding steel plates and phi 820 multiplied by 12mm steel pipes, and M30 cement mortar is poured into the leveling steel box.

In practice, the support 40 is a plate-type rubber support with specification of GJZ250 × 500 × 52 mm.

An assembly type reinforcing method suitable for a simply supported beam bridge of a mountain road is carried out according to the following steps:

(1) drilling and lowering the steel pipe, and firstly, leveling the construction site at the bearing platform manually, wherein the size of the site is 2.5m multiplied by 2.5 m. The down-the-hole drill YXZ90 is hoisted from the deck to the construction site using a truck crane and then drilled. After drilling, a tripod and a positioner are arranged at a hole position, a steel pipe is drilled, the lower hole of the steel pipe is welded and lengthened, and the steel pipe extends into the bearing platform by 1 m.

(2) And (3) grouting the steel pipe by adopting a secondary grouting construction process, wherein the grouting material is M30 cement mortar, and the maximum grain diameter is not more than 2 mm. The pressure of the primary grouting is 0.1-0.2 MPa, the steel pipe needs to be fully filled during grouting, and grouting is carried out in the hole until grouting is carried out outside the pipe. And a secondary grouting high-pressure pipe is arranged in the lower hole of the steel pipe, a grouting plastic guide pipe with a sleeve ring is adopted for secondary grouting, the diameter of the guide pipe is 36mm, a plurality of small holes are formed in the side wall of the guide pipe every 1m and are covered by rubber rings, secondary high-pressure splitting grouting is carried out after primary grouting is carried out for 24, the splitting pressure is not lower than 2.5MPa, and the cement grout is enabled to permeate, extrude and diffuse to the soil body around the steel pipe pile.

(3) Enlarging the pouring and maintenance of the foundation concrete and pre-burying the foundation steel plate,

the base steel plate is 1500 multiplied by 35 multiplied by 500mm and the high-strength anchor bolts M30 multiplied by 1000mm are processed and formed in a factory. Firstly, positioning a high-strength foundation bolt according to the position of a stand column steel pipe of a support bent frame, and binding and fixing the high-strength foundation bolt with a steel bar at a corresponding position in an enlarged foundation. Subsequently, a foundation steel plate is installed, the position of the high-strength foundation bolt is further adjusted, and accurate alignment of all bolts and the foundation steel plate is guaranteed. And finally, pouring concrete and curing the concrete.

(4) Installing a supporting bent frame, injecting micro-expansion concrete into the upright posts,

the upright column is made of phi 820 multiplied by 12mm steel pipes, and a flange plate is welded at the connecting part of each section and is processed and molded in a factory. The cross brace is made of a phi 325 multiplied by 6mm steel pipe, and a flange plate is welded at the connecting part of each section and is processed and molded in a factory. The steel beam is made of 3I 56b I-shaped steels and is machined and formed in a factory. Firstly, single upright columns are assembled into a whole on site, a truck crane is adopted to laterally lift the single upright columns from a bridge deck, holes are formed in corresponding positions of wet joints, auxiliary vertical lifting points are arranged to assist the installation operation of the upright columns, and the installation sequence is that the inner side is arranged first and the outer side is arranged later. And then, adopting a truck crane to install the cross brace, and completing flange connection operation by means of a scaffold. And finally, hoisting the top steel beam to complete flange connection of the steel beam, the stand column and the inclined strut. And after the support bent frame is installed, installing a valve and a pumping pipe by utilizing a pressure injection hole which is formed in the bottom of the steel pipe in advance. C40 self-compacting micro-expansion concrete is injected into the upright column by utilizing a pouring mode of combining a top pump on the bridge surface and a ground pump under the bridge.

(5) And (4) installing the leveling steel box, determining the height size of the leveling steel box according to the actual situation on site, and processing and molding in a factory. And the leveling steel box is installed in a manner of combining a truck crane and a chain hoist, and is fixedly connected with the steel beam in a flange connection manner after being in place. And finally, pouring M30 cement mortar into the leveling steel box.

(6) The construction of jacking and beam-falling is carried out,

and arranging CB100 type jacks at the cover beams corresponding to the ends of the beam bodies, and synchronously jacking all the beam bodies on each cover beam. Firstly, pre-jacking, holding the load for 5min, and checking the working condition of the system; and then formally jacking, wherein the jacking adopts a graded jacking mode, takes 2mm as one grade, loads step by step and jacks till the support can be taken out. Subsequently, the bearers on the old bridge deck were replaced and GJZ250 × 500 × 52mm slab rubber bearers were placed on the levelling steel boxes. And finally, the beam is dropped, all temporary supports are confirmed to be removed before the beam is dropped, the support is installed, and the beam dropping operation and the jacking operation are opposite in procedure.

The patent has the following advantages and beneficial effects; (1) the reinforcing structure and the reinforcing method make up for the reinforcing technology aiming at the integral damage of the simply supported girder bridge in the mountainous area. By the structure and the method, the mountain simple and straight girder bridge can be effectively reinforced, the integral reliability of the bridge is improved, the bearing capacity is improved, the service life of the bridge is greatly prolonged, and the bridge can be widely popularized and applied to mountain simple and straight girder bridge reinforcing engineering; (2) the supporting bent and the leveling steel box in the reinforced structure can be transported to the site for installation after being processed and molded in a factory, and the assembly adopts a high-strength bolt connection mode, so that the site welding workload is small, the construction efficiency is high, the operation is simple and convenient, and the construction quality reliability is high.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An assembled reinforcing structure suitable for a simply supported beam bridge of a mountain highway is characterized in that a reinforcing structure is arranged on the simply supported beam bridge; the fabricated reinforcement structure includes: the device comprises a supporting base (10), a supporting bent (20), a leveling steel box (30) and a support (40); the lower end of the supporting bent frame (20) is fixed on the supporting foundation (10), the upper end of the supporting bent frame (20) supports the leveling steel box (30), and the support (40) is located on the leveling steel box (30).

2. The fabricated reinforced structure of the simply supported beam bridge suitable for the mountain roads of claim 1, wherein; the support foundation (10) adopts a form of an enlarged foundation and a steel pipe cast-in-place pile; the arrangement of the enlarged foundation corresponding to each steel pipe upright on the support bent frame (20) is 2.5M multiplied by 2M, each enlarged foundation is provided with 3 rows of 9 steel pipe cast-in-place piles, the steel pipes adopt phi 140 multiplied by 8mm seamless galvanized anti-corrosion steel pipes, and grouting materials adopt M30 cement mortar.

3. The fabricated reinforced structure of the simply supported beam bridge suitable for the mountain roads of claim 1, wherein; the horizontal bridge direction center distance of the vertical columns of the support bent frame (20) is 5m, the longitudinal bridge direction center distance of each row is 2m from the axis of the pier, the vertical columns adopt phi 820 multiplied by 12mm steel pipes, and C40 self-compacting micro-expansion concrete is poured into the steel pipes; one transverse strut is arranged between every two upright columns at intervals of 4m, and the transverse strut is made of a phi 325 multiplied by 6mm steel pipe; 3I 56b I-shaped steel beams are horizontally arranged at the top as cross beams; the bottom ends of the upright columns of the supporting bent frames are connected with the foundation, the top ends of the upright columns are connected with the cross beam, and the upright columns are connected with the cross beam through flanges.

4. The fabricated reinforced structure of the simply supported beam bridge suitable for the mountain roads of claim 1, wherein; the support bent frame (20) is provided with a leveling steel box (30) to adapt to a bridge deck cross slope, the leveling steel box (30) is formed by welding a steel plate and a phi 820 multiplied by 12mm steel pipe, and M30 cement mortar is poured into the leveling steel box (30).

5. The fabricated reinforced structure of the simply supported beam bridge suitable for the mountain roads of claim 1, wherein; the support (40) adopts a plate type rubber support, and the specification is GJZ250 multiplied by 500 multiplied by 52 mm.