CN209039945U - A kind of trapezoidal bracket simple beam structure used under the conditions of heavy grade - Google Patents

Abstract

The utility model relates to a trapezoidal corbel simply supported beam structure used under the condition of large gradient, which comprises a trapezoidal corbel simply supported beam erected on a bridge pier and a pier top; The bottom surface of the end of the trapezoidal corbel simply supported beam is made up into a plane, and the trapezoidal corbel simply supported beam is erected on the top of the horizontal pier of the bridge pier through the trapezoidal corbel. The utility model adds a trapezoidal corbel at the bottom of the beam end of the railway bridge, simplifies the external force relationship through the conversion of internal force, reduces the force on the support and the force on the top of the pier, can effectively simplify the external force relationship, and reduces the design, construction and maintenance work. reduce the stress on the top of the pier and the bridge support, simplify the pier, reduce the cross section of the pier, and reduce the overall masonry work.

Description

A Trapezoidal Corbel Simply Supported Beam Structure Used in Large Slope Conditions

technical field

The utility model relates to the technical field of bridge structure construction, in particular to a trapezoidal corbel simply supported beam structure used under the condition of large gradient.

Background technique

In recent years, rail transit capacity has been slightly surplus and needs to be transformed and upgraded. However, the rapid development of tourism and the strong demand for traffic in scenic spots have led to the rapid development of tourism rail transit. Due to the terrain, the tourist rail transit often adopts super-large longitudinal slopes due to the limitation of line walking. Different from the previous rail transportation, the tourist track is a combination of various rail transportation systems such as cable railway, cog railway, suspended monorail, straddle monorail, wheel rail and so on.

When cable railways and rack railways are used, the longitudinal gradient of the line can be close to 480‰, while the maximum gradient of our conventional wheel-rail system railway generally does not exceed 30‰. Under such super-large longitudinal slope conditions, the connection between the end of the simply supported beam and the support used in the past cannot meet the requirements of use regardless of the structure or the force calculation, and we need to study a new simply supported beam type.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a trapezoidal corbel simply supported beam structure used under the condition of large gradient, so as to meet the functional requirements of bridge use under the condition of large gradient.

The technical scheme adopted by the utility model is:

A trapezoidal corbel simply supported beam structure used under the condition of large gradient is characterized in that:

Including the trapezoidal corbel simply supported beam erected on the bridge pier and the pier top;

The trapezoidal corbel simply supported beam is inclined as a whole, and the bottom surface of the end is provided with a trapezoidal corbel. The bottom surface of the end of the trapezoidal corbel simply supported beam is made up into a plane. superior.

The top of the pier is provided with a support, and the trapezoidal corbel at the end of the simply supported beam of the trapezoidal corbel is placed on the support.

The trapezoidal corbel simply supported beam is inclined as a whole, and the longitudinal end face is vertical.

The supports on the top of the piers of the bridge piers include two longitudinal groups, front and rear, respectively bearing the trapezoidal corbels of the front and rear two trapezoidal corbel simply supported beams.

The utility model has the following advantages:

(1) Simplified force system of trapezoidal corbel block:

After using the new simply supported beam, the force relationship is simple, and the support point is only subjected to a vertical gravity. The new simply supported beam converts the complex horizontal force, support force, oblique force, friction force and other external forces into the internal force of the beam end, and the beam end structure size is large, the reinforcement arrangement is many, and the force performance is good, and it is fully capable of solving these complex problems. force.

(2) Reduced bearing force:

The beam end of the former simply supported beam is perpendicular to the top and bottom of the beam, when the simply supported beam is supported on the pier

When sitting on the seat, the force is complicated. The sliding force and gravity of the beam itself cause the support to be subjected to various forces such as vertical force, oblique force, horizontal force, friction force, etc., and the magnitude and direction are different, so the calculation is complicated. It is usually in the form of adding a wedge-shaped block at the bottom of the beam, but the wedge-shaped block is troublesome to apply, and the adjustment height is limited, which cannot meet the requirements under super-large slopes.

After switching to the new type of simply supported beam, when there is only static load or live load and uniform motion, the bearing is only subjected to one vertical gravity, and the horizontal force can be ignored, and the horizontal force of the bearing is significantly reduced.

(3) Reduce the beam joints and increase the smoothness of the bridge deck:

The beam ends of the currently used simply supported beams are perpendicular to the top and bottom surfaces of the beam. When the pier is located at the point of change of slope, a folded angle is bound to be formed at the two beam ends due to the influence of the vertical curve. However, after adopting the new type of simply supported beam, the beam ends are vertically downward, no matter what the slope is, the beam ends of the two-hole beams must be parallel, and there is no need to deal with the corners between the two-hole beams to enhance the smoothness of the transition between adjacent simply supported beams. .

(4) Simplified bridge pier:

The trapezoidal corbel simply supported beam converts the complex external force into the internal force. By adding a small trapezoidal corbel, the horizontal force on the top of the pier is greatly reduced, the section of the pier body is reduced, and the masonry volume of the overall bridge structure is reduced.

Description of drawings

Figure 1 shows the layout of the currently commonly used simply supported girder bridges.

Fig. 2 is the layout diagram of the simply supported girder bridge of the present invention.

Figure 3 is the force relationship diagram of the commonly used simply supported girder bridges.

FIG. 4 is a diagram showing the relationship between human forces on a simply supported girder bridge of the present invention.

In the figure, 1- conventional simply supported beam, 2- trapezoidal corbel simply supported beam, 3- support, 4- bridge pier, 5- trapezoidal corbel.

Detailed ways

The present utility model will be described in detail below in conjunction with specific embodiments.

The utility model relates to a trapezoidal corbel simply supported beam structure used under the condition of large gradient. The design principle is to add a trapezoidal corbel at the bottom of the beam end of a railway bridge, simplify the external force relationship through internal force conversion, reduce the bearing force and The top of the pier is stressed. The structure includes a bridge pier 4 and a trapezoidal corbel simply supported beam 2 erected on the top of the pier; the trapezoidal corbel simply supported beam 2 is inclined as a whole, and the bottom surface of the end is provided with a trapezoidal corbel 5 to make up the bottom surface of the end of the trapezoidal corbel simply supported beam 2. In a plane, the trapezoidal corbel simply supported beam 2 is erected on the horizontal pier top of the bridge pier 4 through the trapezoidal corbel 5 . The trapezoidal corbel simply supported beam 2 is inclined as a whole, the longitudinal end faces are vertical, and the two adjacent trapezoidal corbel simply supported beams 2 are butted at the top of the bridge pier 4, and the butt joint is vertical.

The top of the bridge pier 4 is provided with a support 3 , and the trapezoidal corbel 5 at the end of the trapezoidal corbel simply supported beam 2 is placed on the support 3 . The supports 3 on the top of the bridge pier 4 include two longitudinal groups, front and rear, respectively bearing the trapezoidal corbels 5 of the front and rear two trapezoidal corbel simply supported beams 2 .

Under the condition of large gradient, the utility model makes the top and bottom of the beam approximately the same as the gradient, the end of the beam is vertically downward, and a trapezoidal calf with the same width as the beam and a horizontal bottom surface is added to the bottom of the beam end of the simply supported beam Steel bars are arranged in the trapezoidal corbel block to form an overall stress system with the entire beam body.

In the structure, the beam body is constructed first, and the conventional beam body formwork is changed. According to the shape of the trapezoidal corbel simply supported beam with the corbel block, the formwork is applied. After the formwork is installed, the steel bars are bound in the formwork, concrete is poured, and prestressing is added. After the concrete reaches the curing age, the formwork is removed, and the construction of the trapezoidal corbel simply supported beam is completed.

The utility model can effectively simplify the force relationship and reduce the design and construction workload. Reduce the stress on the top of the pier and the bridge support, simplify the pier, reduce the cross section of the pier, and reduce the overall masonry work.

The content of the present invention is not limited to those listed in the embodiments, and any equivalent transformations taken by those of ordinary skill in the art to the technical solutions of the present invention by reading the description of the present invention are covered by the claims of the present invention.

Claims (4)

1. a trapezoidal corbel simply supported beam structure used under a large gradient condition is characterized in that: Including the pier (4) and the trapezoidal corbel simply supported beam (2) erected on the top of the pier; The trapezoidal corbel simply supported beam (2) is inclined as a whole, and the bottom surface of the end is provided with a trapezoidal corbel (5). ) is erected on the top of the horizontal pier of the bridge pier (4) through the trapezoidal corbel (5). 2. the trapezoidal corbel simply supported beam structure used under a kind of large gradient condition according to claim 1, is characterized in that: The bridge pier (4) is provided with a support (3) on the top of the pier, and the trapezoidal corbel (5) at the end of the trapezoidal corbel simply supported beam (2) is placed on the support (3). 3. the trapezoidal corbel simply supported beam structure used under a kind of large gradient condition according to claim 1 is characterized in that: The trapezoidal corbel simply supported beam (2) is inclined as a whole, and the longitudinal end face is vertical. 4. the trapezoidal corbel simply supported beam structure used under a kind of large gradient condition according to claim 2 is characterized in that: The supports (3) on the pier top of the bridge pier (4) include longitudinal front and rear groups, respectively bearing the trapezoidal corbels (5) of the front and rear two trapezoidal corbel simply supported beams (2).