JPH04202905A - Elevated railway bridge and its construction process - Google Patents

Abstract

PURPOSE:To construct an elevated railway bridge easily and in a short time by erecting an installation slab between lateral beams, which are laterally built at the top of a pedestal for an elevated railway bridge, and in the laying direction of the rail and providing main girder, which faces to the pedestal for the elevated railway bridge, on the upper part of the slab together with arranging a snow-storage part between a sound-proof wall, which is formed on the installation slab placed and the main girder. CONSTITUTION:A lateral beam 2 is formed on the top of a pedestal 1 for an elevated railway bridge, and an installation slab 3, which extends in the laying direction of a railway 4a, is formed on the upper surface of the beam 2. Next, a main girder 4 extending across the lateral beam 2 is formed above the installation slab 3. In addition, a snow-storage part 5 is formed between a sound-proof wall 3b, which is formed on both sides of the installation slab 3, and the main girder 4. With this contrivance, the elevated railway bridge can be constructed easily and in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an elevated railway bridge and its construction method.

(Prior art) As shown in FIG.
0 are constructed integrally.

This is constructed by erecting a formwork up to the upper end of the column base 10 on site and pouring cast-in-place concrete into the formwork.

However, with this construction method, the formwork must be erected at the top of the column base 1o, and this formwork must be supported with shoring that is equal to or longer than the column base 10, which increases construction costs and There was also the problem of prolonging the construction period.

Furthermore, elevated railway bridges are located in areas with heavy snowfall, so how to deal with snow on the tracks is a major issue. Conventionally, measures to deal with snow on the tracks include water extinguishing, Russell cars, rotary cars, etc. Forced snow removal was carried out by means of a method, but there was a problem in that all of these methods required a large amount of expense.

Therefore, in order to solve these problems, an elevated railway bridge was devised with a snow storage section next to the main beam to store snow on the tracks.

This is cast-in-place concrete with main beams, slabs, cross beams,
There are those in which the ducts are constructed individually, and those in which steel is attached to these three members except the slab, and these four members are combined with a precast concrete slab.

(Problem to be solved by the invention) However, in the case where the main beam, slab, cross beam, and duct are integrated, there is a risk that cracks may occur because the slab in the snow storage area is thin, and the main beam and slab are Because they are integrated, when the train is running, vibrations from the main beam are directly transmitted to the slab, causing secondary noise that causes the slab to vibrate as well.

Furthermore, attaching steel to the main beam, cross beam, and tactile members was uneconomical because not only did the use of steel increase material costs, but also complicated waterproofing and construction.

The present invention was made in view of the above-mentioned problems, and its purpose is to provide an elevated railway that can be constructed easily in a short period of time, and that has low construction costs and maintenance costs such as before snow removal. Our objective is to provide bridges and their construction methods.

(Means for Achieving the Objects) The elevated railway bridge of the present invention for achieving the above-mentioned objects includes a cross beam spanned in the width direction at the upper end of the column pedestal for the elevated railway bridge, and a railway track between the cross beams. A precast concrete installation slab spanned in the laying direction, and a main beam formed across the pillar bases for each elevated railway bridge on the installation slab,
The structure is characterized by a snow storage area formed between the main beam and soundproof walls erected on both sides of the installation slab. A cross beam is spanned over the upper end of the column pedestals for an elevated railway bridge that have been erected continuously, and a precast concrete slab is laid between the cross beams to form an installation slab extending in the track laying direction, and the top surface of the installation slab is After constructing shoring based on the installation slab and installing a formwork, concrete is poured into the formwork, a main beam is erected between the horizontal beams, and soundproof walls are erected on both sides of the installation slab. The present invention is characterized in that a snow storage portion is formed between the soundproof wall and the main beam.

(Function) According to the elevated railway bridge configured as described above, a snow storage section is formed between the main beam and the soundproof wall under the main beam, so that a large space can be taken up for the snow storage section. As a result, snow removal becomes easy and maintenance costs before snow removal can be reduced, and since the main beam is constructed on the surface of the installation slab, a large space can be taken up for the installation slab.

In addition, according to the method of constructing an elevated railway bridge as described above, the installation slab is formed from a precast concrete slab, so it can be constructed in a short period of time, and there is no need for extensive shoring, which reduces construction costs. can also be reduced.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 1 shows a cross-sectional view of the elevated railway bridge, and Figure 2 shows a side view of the same.

The elevated railway bridge A has a cross beam 2 formed at the upper end of the column pedestal 1 for the elevated railway bridge, and a telecast concrete slab 3 on the upper surface of the cross beam 2.
Installation slab 3 that extends in the direction in which the track 4a is laid by laying the track 4a.
By forming a main beam 4 across between the horizontal beams 2 on the installation slab 3, a snow storage section 5 is formed between the main beam 4 and the soundproof walls 3b on both sides of the installation slab 3. It is configured.

The main beam 4 is formed so as to be supported by the cross beams 2 by pouring cast-in-place concrete into a formwork formed on the installation slab 3. By forming the main beam 4, the adjacent cross beams 2 are firmly connected, resulting in a structure with excellent earthquake resistance.

Further, the main beam 4 is formed on the elevated railway bridge column pedestal 1 so that the load thereof is supported by the elevated railway bridge column pedestal 1, and a track 4a is laid on the upper surface thereof.

Since the main beam 4 is installed on the cross beam 2 and the installation slab 3 in this way, a snow storage section 5 is formed under the armpit of the main beam 4, and the snow accumulated on the track 4a is removed to the snow storage section 5. be able to.

Next, the construction method for this elevated railway bridge A will be explained.

Figures 3 and 4 are a cross-sectional view and a side view showing the construction method of the elevated railway bridge A.

[Formation of cross beams]

First of all, cross beams 2 are attached to the upper ends of each elevated railway horizontal column base 1, which are erected at appropriate intervals along the laying direction of the track 4a.
form. This is formed by forming a formwork at the upper end of the elevated railway horizontal column base 1, arranging reinforcing bars in the formwork, and pouring cast-in-place concrete.

[Laying of Installation Slabs j Next, precast concrete slabs 3a are stretched between the cross beams 2 to form installation slabs 3 in the laying direction of the track 4a.

[Formation of the main beam ζ After forming the cross beam 2 and the installation slab 3 as described above, a formwork for the main beam 4 is formed by using the installation slab 3 as a base and erecting a support on its upper surface.

At this time, the amount of subsidence of the support due to the weight of the concrete of the main beam 4 is calculated in advance, and the amount of settlement is exceeded by the required amount.

Then, when reinforcing bars are arranged within the formwork and cast-in-place concrete is placed, the main beam 4 and the cross beam 2 are connected.

[Formation of snow storage section] Next, after the concrete cast in the formwork has hardened, the formwork is dismantled. Then, support columns 3C for the soundproof walls 3b are erected on both sides of the installation slab 3 at intervals of the cross beams 2, and the soundproof walls 3b are lifted up with a crane and attached to the support columns 3C, so that A snow storage section 5 is formed between the soundproof wall 3b and the soundproof wall 3b.

(Effects of the Invention) The present invention has the following effects by having the above configuration.

(2) Since the installation slab is formed from a precast concrete slab and the main beam is provided on the top surface of the installation slab, a large snow storage space can be provided between the main beam and the soundproof wall below the main beam.

(2) Since the slab surface can be used widely, workability and safety on the slab surface are improved, and the installation location of the cable duct can be selected at any location.

■ Since the main beam and installation slab are not integrally formed, the vibrations of the main beam when a train passes are not directly transmitted to the slab, significantly reducing secondary noise.

■ Because the mechanical properties of the precast concrete slab are clear, the predicted values for the shoring overhang calculation are highly accurate.

■ Since the slab, which makes up a large proportion of elevated railway bridges, is formed from precast concrete slabs, processes such as formwork installation, reinforcing steel assembly, and concrete curing are eliminated, making it possible to construct elevated railway bridges in a short period of time.

■ When forming the main beam, the support that supports the formwork of the main beam can be erected from the installation slab surface, which greatly reduces the amount of empty erecting of the support, which is economical and short-term. Elevated railway bridges can be built.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an elevated railway bridge, Figure 2 is a side view of the same, Figure 3 is a cross-sectional view showing the method of constructing an elevated railway bridge, Figure 4 is a side view of the same, and Figure 5 is a conventional Cross section of elevated railway bridge, No. 6
The figure is a longitudinal sectional view of the same. In the diagram, A° Elevated railway bridge 1 Elevated railway horizontal column base 2/Horizontal beam 3: Installation slab constructed from precast concrete slab 3a Precast concrete slab 3b: Soundproof wall 3c, Soundproof wall support 4 Main beam
5. This is the snow storage section. Figure 1 Figure 2 Figure 5 Figure 6 Beauty

Claims (2)

[Claims] (1) A cross beam spanned across the upper end of the column pedestal for an elevated railway bridge in the width direction, a precast concrete installation slab installed between the cross beams in the track laying direction, and each of the above-mentioned elevated railways on the installation slab. 1. An elevated railway bridge comprising a main beam extending between bridge columns, and a snow storage section formed between the main beam and soundproof walls erected on both sides of an installation slab. (2) Cross beams are spanned over the upper ends of elevated railway bridge pillars that have been erected continuously at appropriate intervals, and a precast concrete slab is laid between the cross beams to form an installation slab that extends in the direction in which the railway is laid. After constructing a support structure and installing a formwork on the top surface of the installation slab using the installation slab as a base, concrete is poured into the formwork and a main beam is erected between the horizontal beams, and soundproof walls are installed on both sides of the installation slab. A method for constructing an elevated railway bridge, characterized in that a snow storage section is formed between the soundproof wall and the main beam by erecting the soundproof wall.