JPS61169507A - Under support type construction working vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to all cantilever-erected bridges, and particularly relates to an under-supported construction vehicle suitable for cable-stayed bridges and stone-tied bridges. 0〈Prior art and its problems〉 As an erection work vehicle, there is a so-called forbauwagen, which has a movable main truss on the top of the bridge girder, and suspends the formwork and scaffolding from the tip of the main truss using timbers. be.

In the case of such an erection work vehicle, the equipment is large and heavy due to its structure, and the space above the bridge girder is occupied, so it is not possible to use a structure such as a cable-stayed bridge where hanging materials are placed. It is disadvantageous and has poor workability.

The present invention has been proposed in view of the above circumstances, and its purpose is to provide an under-support type construction work vehicle that can be applied to cable-stayed bridges and the like.

<Means for Solving the Problems> The under-support type construction work vehicle according to the present invention is installed below the bridge girder to be constructed along the bridge girder construction direction, and has a formwork and a front end.
A girder on which the scaffold is mounted, a cross beam that is suspended from the existing girder in a shape that embraces the existing girder from below, supports the girder at the lower part, and is detachable from the existing girder using hanging materials; A traveling device that is attached to the upper part of the cross beam and moves the entire working vehicle, a lifting device that raises and lowers the entire working vehicle, and a reaction force receiver that is installed at the rear of the girder and transmits the reaction force of the working vehicle to the lower surface of the existing girder. The formwork and scaffolding were supported directly to the existing girder by cross beams and girders, and the reaction force receiver was installed in a cantilevered manner by taking the reaction force to the lower side of the existing girder using a device. It is something.

<Example> An explanation will be given below based on an embodiment illustrating the present invention.

As shown in FIGS. 1 and 2, a pair of girders 1 are installed below the bridge girder G in the bridge girder width direction toward the bridge girder construction direction. is on the shelf.

The pair of girders 1, 1 are supported substantially at the center by a cross beam 4 and connected to each other by a diagonal member 16.

The cross beam 4 consists of two upper cross beams 5, two hanging beams 6, and a lower cross beam 7.
The girder 1 is rigidly connected to the girder 1 so as to embrace the existing girder Gl from below, and supports the girder 1 by the lower cross beam 7 while being vertically installed on the existing girder G1.

Furthermore, the existing girder G1
It is removably fixed to and tightened by tensioning jacks 9.

A traveling device 1o is attached to the lower surface of the upper cross beam 5 to cause the entire working vehicle to travel. This traveling device 10 includes a traveling rail 1
It consists of a pair of wheels 10t that roll on wheels 0a and a drive device ioc that drives them.

Further, a lifting jack 1) as a lifting device is attached to the lower surface of the upper cross beam 5, so that the mold 3 can be removed and set by lifting and lowering the entire working vehicle.

Further, a reaction force receiving device 12 is provided on the upper surface of the rear end of the girder 1 for transmitting the reaction force of the working vehicle to the lower surface of the existing girder. This reaction force receiving device 12 is made of rubber wheels 12.
a and the reaction force receiver are comprised of a jack 12b, the former being used during movement and the latter during pouring.

The following construction work is carried out using the under-support type construction work vehicle configured as described above. (See Figures 3 to 6) 1) After pouring the concrete in G2, loosen the hanging material 8 using the tensioning jack 9 and remove it. At this time, the lifting jack 1) and the reaction jack 12b are jacked up, and the wheels 10b and 12a are in a floating state.

(1)) After advancing the running rail 1oa from this state to a predetermined position and fixing it, the jacks 1)゜12b are jacked down, thereby removing the formwork 3 and removing the wheels 1.
The work vehicle is supported by 0b and 12a.

01)) After the work vehicle is advanced to a predetermined position by the traveling device 1o, the jacks 1) and 121) are jacked up to raise the work vehicle, and the formwork 3 is set at a predetermined position.

(1ψ Insert the diagonal hanging material 8 and tighten it with the tensioning jack 9 to fix the work vehicle to the existing girder. Here,
The hanging material passes through the upper cross beam 5, the side wall of the girder, and the lower cross beam 7, and the cross beams 5 and 7 are tightly connected.

Concrete is poured from this state, and then (1)
~Ov) A bridge is constructed by repeating steps.

Incidentally, such an erection work vehicle can be easily used as a support for central connection work by making simple modifications.

<Effects of the Invention> Since the under-support type construction work vehicle according to the present invention has the above-described configuration, it has the following effects.

(1) Since there is a space on the upper surface of the bridge girder, it is economically advantageous even in structures where suspension members are arranged, such as cable-stayed bridges, and has good workability.

(1)) The structure can be relatively simple and the weight can be reduced.

01)) Formwork and scaffolding can be integrated.

M Can be easily modified to support for central connection 1.

[Brief explanation of drawings]

1 and 2 are a side view, a cross-sectional view, a side view, a cross-sectional view, and a side view, a cross-sectional view, and a side view and a cross-sectional view, respectively, of an under-supported construction vehicle according to the present invention.
The figures are schematic diagrams showing construction work using a similar work vehicle in the order of construction, with (A) being a side view and (B) being a cross-sectional view. 1. Girder 12. Scaffolding, 3. Formwork, 4. Cross beam, 5. Upper cross beam, 6. Hanging beam, 7. Lower cross beam, 8.
・Hanging material, 9.・Tensioning jack, 10.・Travel device, 1
0a...Traveling rail, 10b...Wheels, IOC...Drive device, 1)...Elevating jack, 12...Reaction force receiver is device, 12a...Wheel, 12b...Reaction force receiver is jack, 1
3. Diagonal material.

Claims (1)

[Claims] (1) A girder is installed below the bridge girder to be constructed in the direction of bridge girder construction, and the formwork and scaffolding are loaded on the front end.The girder is installed vertically on the existing girder in a shape that embraces the existing girder from below, and the lower part a cross beam that supports the girder and is detachable from the existing girder by means of hanging materials; a traveling device that is attached to the top of the cross beam and moves the entire working vehicle; a lifting device that raises and lowers the entire working vehicle; and the girder. An under-support type construction work vehicle characterized by comprising a reaction force receiving device installed at the rear of the work vehicle and transmitting the reaction force of the work vehicle to the lower surface of an existing girder.