JP2997846B2 - Girder erection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of erection of an overhang girder when forming artificial ground over a railway station or a road.

<Prior Art> In recent years, a plan has been proposed in which an artificial ground is formed using a railway station or an upper space of a road to make effective use of land.

<Problems to be Solved by the Present Invention> When a wide structure is constructed in an upper space such as a track, there are the following problems.

<B> Because it is built above the railway in use,
If there is a falling object, a serious accident will occur.

Therefore, it is necessary to provide complete protection for falling objects, but it is extremely difficult to provide complete protection after working for a long time in orbit.

<B> It is necessary to construct structures with as long a span as possible without violating the building limits of the track in use.

Conventionally, there is no technology suitable for such work. In particular, when working in an urban area where the land width is small, it is not possible to adopt a construction method that requires a large land, such as a hand-rolling method or an extrusion method.

<Object of the present invention> The present invention has been made to solve the above-described problems, and has an object to provide the following erection method.

<B> A method that can minimize the work time in the sky above tracks and roads to avoid the occurrence of falling objects. <B> Install a plurality of girders side by side in the sky above tracks and roads. In this way, a group of support beams for constructing artificial ground can be continuously and efficiently and safely obtained.

<Means for solving the problems> That is, in the present invention, foundation walls of a fixed height are provided opposite to each other on both sides of a track or a road in parallel with the track, etc., and a swivel table is provided above these foundation walls. Mount the overhanging girder on the foundation wall, attach the end of the overhanging girder to the swivel on the foundation wall, and rotate the overhanging girder at the opposite position on both sides to rotate the overhanging girder to the track etc. In the method in which the free ends of both overhanging girders are joined together and the girders are erected, the swivel base is movable along each foundation wall, and faces each other while moving the swivel base. A method of erection of a girder, comprising erection of a plurality of girders between foundation walls.

<Description of the Present Invention> Hereinafter, the present invention will be described in detail, particularly for erection on a track, but it goes without saying that the present invention can be similarly applied to roads and the like.

<B> Foundation wall On both sides of the orbit, construct a long foundation wall 1 in parallel.

The foundation wall 1 may constitute a part of a future structure, or may be used as a temporary structure for work until the end of the work.

A rail 11 is laid on the upper surface of the foundation wall 1 in the longitudinal direction.

<B> Turning table The turning table 2 is movably mounted on the rail 11 of the foundation wall 1.

This swivel 2 has wheels, has a rotation axis in the center,
Further, it is a structure that allows the outrigger 21 to protrude toward the periphery.

A load 22 as a counterweight is attached to one side of the swivel 2 so as to be detachable.

Further, a frame 23 protrudes upward from the swivel 2.

The frame 23 is for supporting an overhang beam 3 described later.

Furthermore, if a mechanism for adjusting the height of a jack or the like is incorporated in the swivel base 2, the work of adjusting the height of the overhang girder 3 during the installation and the work of changing the height of the overhang girder 3 on the foundation wall 1 are easy. It is.

<C> Overhang girder Assemble the overhang girder 3 on the upper surface of the foundation wall 1.

This assembling is performed by a portal crane straddling the foundation wall 1 or a tower crane arranged on the ground on the side of the foundation wall 1.

As the overhanging girder 3 itself, a girder having a normal truss structure or other well-known structures can be used.

Since the base wall 1 has a long extension, a long overhanging girder 3 can be assembled by using the upper surface thereof.

The base end of the overhanging spar 3 is fixed to the swivel 2.

Furthermore, the middle of the overhanging girder 3 and the frame 23 of the swivel 2
Are connected and supported by a diagonal member 31.

If a telescopic member in the horizontal direction constituted by a horizontal jack or the like is provided at the tip of the overhanging spar 3, connection work is easy.

 Next, a working method will be described.

<A> Assembly on the foundation wall As described above, the swivel 2 is mounted on the rail 11 on the foundation wall 1 and the overhanging girders 3 are assembled using the area on the foundation wall 1.

 Then, the base end of the overhang girder 3 is attached to the swivel 2.

<B> Turning the overhang girder The swivel 2 is moved on the rail 11 on the foundation wall 1 and is positioned opposite to the track.

Then, the turntable 2 is rotated by 90 degrees using the time at midnight when the operation of the railway vehicle is completed.

Then, from the foundation walls 1 on both sides, the projecting girders 3 project into the space on the track, and their free ends eventually come into contact.

If both ends are connected in a contact state, the two girders projecting from both sides become one girder.

After that, the base of the overhanging girder 3 is
, And detached from the swivel 2 to complete the erection work.

If the up-and-down mechanism of the swivel base 2 and the telescopic mechanism of the overhang girder 3 function during the connection work at both ends, even if the overhang girder 3 is long, the connection work and the work for changing the mounting on the foundation wall 1 can be performed. Easy and quick to do.

When such a girder erection process is repeated while moving the position of the swivel 2, many girders are erected between the two foundation walls 1.

In this manner, a group of support frames for constructing an artificial ground or the like composed of a plurality of girders can be continuously and efficiently erected.

<C> Construction of structures After constructing artificial ground etc. by erection of multiple girder,
In addition, office buildings, apartment houses, assembly facilities and other structures for various purposes are constructed.

<Effects of the Present Invention> According to the present invention, a girder can be erected over a wide space by the above-described steps, and the following effects can be achieved.

<A> Work in the space above the track is only the work of turning the girder and joining the center.

Therefore, the work can be completed within a short time at midnight.

For this reason, there is extremely little danger that an object falls on a track or the like, which has been the biggest problem in the past.

Furthermore, in the case of an orbit, the work is completed in the middle of the night, within a short time after power transmission is stopped, so that even if there is a falling object, it does not lead to a serious accident.

<B> When a long span girder is erected, the conventional hand-rolling method and extrusion method required a large space in the direction perpendicular to the line.

However, according to the method of the present invention, the assembling work and the erection work can be performed in a narrow space parallel to the track or the like, so that the erection work can be performed even in an urban area where there is no room for land.

<C> A support frame group for constructing an artificial ground or the like can be continuously and efficiently and safely obtained above an existing structure such as a track or a road.

[Brief description of the drawings]

 Fig. 1: Illustration of the swivel for erection work Fig. 2: Side view after erection Fig. 3: Plan view

Continued on the front page (72) Mineo Kobayashi, Inventor 1-25-1 Nishi Shinjuku, Shinjuku-ku, Tokyo Daisei Construction Co., Ltd. (72) Masahiro Oshima 1-1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Large (56) References JP-A-2-27008 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 1/00 E04H 3/00 E04G 21/14 E01D 21/08-21/10

Claims (1)

(57) [Claims] 1. A base wall having a fixed height is provided on both sides of a track or a road in parallel with the track or the like, and a swivel is mounted on an upper portion of the base wall. Assemble the girder, attach the end of the overhanging girder to the swivel on the foundation wall, and rotate the swivel at the opposing positions on both sides to project the overhanging girder into the space above the track, etc. A method of erection of a girder by joining free ends, wherein the swivel is movable along each foundation wall, and a plurality of girders are constructed between opposing foundation walls while moving the swivel. A method of erection of a girder, characterized in that: