JPH0689525B2 - Elevated railway bridge and its construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an elevated railway bridge and a construction method thereof.

(Prior Art) In an elevated railway bridge currently used for railways, a main beam 40, a slab 50, a lateral beam 20, and a soundproof wall 30 are integrally constructed as shown in FIG.

This is a construction in which a formwork is built up to the upper end of the column base 10 at the site and the cast-in-place concrete is placed on the formwork.

However, in this construction method, the formwork must be purposefully built up to the upper end of the column base 10, and this formwork must be supported by a support work of a length equal to or longer than that of the column base 10. There was a problem that the construction period would be prolonged.

Furthermore, how to handle snow on railway tracks is a major issue in elevated snow bridges in heavy snowfall areas. Conventionally, as measures against snow on these railway tracks, sprinkling snow removal, Russell cars or rotary cars have been used. Although forced snow removal was performed, all of them had a problem that they required a great deal of expense.

Therefore, in order to solve these problems, an elevated railway bridge having a snow storage section for accommodating snow on the tracks and the like beside the main beam was considered.

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

(Problems to be solved by the invention) However, the above-mentioned main beam, slab, lateral beam, and duct are integrated, and the slab of the snow storage part is thin, so cracks may occur, and the main beam and slab Because of the integrated structure, the vibration of the main beam was directly transmitted to the slab when the train was running, causing secondary noise that also vibrates the slab.

Further, the one in which the steel member is attached to the three members of the main beam, the lateral beam, and the duct is uneconomical because not only the material cost becomes expensive because the steel member is used but also the waterproofing work and the construction become complicated.

The present invention has been made in view of the above problems, and an object thereof is an elevated railway that can be easily constructed in a short period of time and that maintenance costs such as construction costs and snow removal costs are low. It is to provide a bridge and its construction method.

(Means for Achieving the Object) The elevated railway bridge of the present invention for achieving the above-mentioned object is a cross beam crossed over the upper end of a pillar pier for an elevated railway bridge in the lateral width direction, and a line between the cross beams. An installation slab made of precast concrete that has been bridged in the laying direction of, and a main beam formed over the installation slab between each of the elevated railroad bridge column bases,
The construction method is characterized by comprising a snow-storing part formed between the main beam and soundproof walls standing upright on both sides of the installation slab. A horizontal beam is laid on the upper end of the column base for an elevated railway bridge that is continuously erected, a precast concrete plate is laid between the horizontal beams to form an installation slab that extends in the laying direction of the track, and it is installed on the upper surface of the installation slab. After constructing a supporting structure based on a slab and installing a formwork, concrete is placed in the formwork and a main beam is installed between the horizontal beams, and soundproof walls are erected on both sides of the installation slab. A snow storage part is formed between the soundproof wall and the main beam.

(Operation) According to the elevated railway bridge having the above-described structure, the snow storage portion is formed between the soundproof wall below the main beam, so that the space of the snow storage portion is increased. Since the snow can be easily removed, maintenance costs such as snow removal costs can be reduced, and since the main beam is installed on the surface of the installation slab, a large space for the installation slab can be secured.

Further, according to the construction method of the elevated railway bridge as described above, since the installation slab is formed of the precast concrete slab, it can be constructed in a short period of time and, in addition, a long support work is not required. Can be reduced.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

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

The elevated railway bridge A has a horizontal beam 2 formed on the upper end of a column base 1 for an elevated railway bridge, and a precast concrete slab 3a is formed on the upper surface of the horizontal beam 2.
Is installed to form the installation slab 3 extending in the laying direction of the line 4a, and the main beam 4 is extended across the installation slab 3 between the horizontal beams 2.
By forming the above, the snow storage part 5 is formed between the main beam 4 and the soundproof walls 3b on both sides of the installation slab 3.

The main beam 4 is formed so as to be supported by the horizontal beam 2 by pouring cast-in-place concrete into a form formed on the installation slab 3. Then, by the formation of the main beam 4, the adjacent horizontal beams 2 are firmly connected to each other, and a structure excellent in earthquake resistance is obtained.

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

Since the main beam 4 is installed on the horizontal beam 2 and the installation slab 3 in this way, a snow storage part 5 is formed under the side of the main beam 4 and the snow accumulated on the track 4a is discharged to the snow storage part 5. can do.

Next, the construction method of this elevated railway bridge A will be described.

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 Beam] First, a cross beam 2 is formed at the upper end of each elevated railroad bridge column base 1, which is erected at appropriate intervals along the laying direction of the line 4a. This is formed by forming a formwork at the upper end of the column base 1 for an elevated railway bridge, arranging reinforcing bars in the formwork, and pouring cast-in-place concrete.

[Laying Installation Slab] Next, the precast concrete slabs 3a are laid across the transverse beams 2 to form the installation slab 3 in the laying direction of the line 4a.

[Formation of Main Beam] After forming the horizontal beam 2 and the installation slab 3 as described above, a supporting structure is erected on the upper surface of the installation slab 3 as a base to form a formwork for the main beam 4.

At this time, the subsidence amount of the supporting work due to the weight of the concrete of the main beam 4 is calculated in advance, and the required amount is raised.

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

[Formation of Snow Storage] Next, the mold is disassembled after the concrete cast into the mold is hardened. And soundproof walls on both sides of the installation slab 3
Support pillars 3c for 3b are erected at intervals of the horizontal beams 2, and
By lifting the soundproof wall 3b with a crane and attaching it to the support pillar 3c, a snow storage part 5 is formed between the soundproof wall 3b and the underside of the main beam 4.

(Effects of the Invention) The present invention has the following effects due to the above configuration.

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

Since the slab surface can be widely used, the workability and safety on the slab surface are improved, and the installation location of the cable duct can be selected at an arbitrary position.

Since the main beam and the installation slab are not integrally formed,
The vibration of the main beam when passing the train is not directly transmitted to the slab, and the secondary noise is greatly reduced.

Since the mechanical properties of the precast concrete slabs are clear, the accuracy of the predicted uplift calculation for shoring work is high.

Since the slabs that make up a large proportion of the elevated railway bridge are made of precast concrete slabs, the steps of formwork, rebar assembly, concrete curing, etc. are eliminated, so that the elevated railway bridge can be constructed in a short period of time.

When the main beam is formed, the supporting work that supports the formwork of the main beam can be built from the installation slab surface, so the empty space of the supporting work is greatly reduced, and it is economical and can be elevated in a short time. You can build a railroad bridge.

[Brief description of drawings]

Fig. 1 is a cross-sectional view of an elevated railroad bridge, Fig. 2 is a side view of the same, Fig. 3 is a cross-sectional view showing how to construct an elevated railroad bridge, Fig. 4 is the same side view, and Fig. 5 is a conventional side view. Cross section of elevated railway bridge, No. 6
The figure is a vertical sectional view of the same. In the figure, A: Elevated railway bridge 1: Elevated railway bridge column base, 2: Horizontal beam 3: Installation slab constructed with precast concrete slab 3a: Precast concrete slab 3b: Soundproof wall, 3c ...... Soundproof wall stanchion 4: Main Liang, 5: Snow storage section.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshihiro Murayama 1-25-8 Hongo Hongo House, Bunkyo-ku, Tokyo 1105 (72) Inventor Kenji Saito 582-2 Nishi, Kuki-shi, Saitama (72) Inventor Tatsuo Wakai 113-608 Matsudo, Matsudo City, Chiba Prefecture (56) References JP 60-59362 (JP, B2) JP 54-39761 (JP, Y2)

Claims (2)

[Claims] 1. A horizontal beam laid across the widthwise direction on the upper end of a column base for an elevated railway bridge, an installation slab made of precast concrete laid across the horizontal beams in the direction of laying a track, and each of the above-mentioned installation slabs. An elevated railway bridge comprising: a main beam formed between pillar columns for an elevated railway bridge; and a snow storage part formed between the main beam and soundproof walls standing on both sides of the installation slab. 2. An installation slab that extends in the laying direction of a track is formed by straddling a horizontal beam on the upper end of a column base for an elevated railway bridge that is continuously erected at appropriate intervals and laying a precast concrete slab between the horizontal beams. After installing a supporting structure on the upper surface of the installation slab based on the installation slab and installing a formwork, concrete is placed in the formwork and a main beam is installed between the horizontal beams, and both sides of the installation slab are installed. A construction method for an elevated railway bridge, characterized in that a soundproof wall is erected and a snow storage part is formed between the soundproof wall and the main beam.