JPH1082020A - Precast block erection equipment - Google Patents

Abstract

(57) [Summary] [Problem] When a truss is advanced, there is no need to provide a running rail on a bridge surface, work is easy, and a stable state is maintained without lifting of a rear support when moving. The bridge can be moved, and the bridge body is not subjected to a load for erection. Therefore, it is not necessary to increase the strength of the entire bridge body, and the work can always be performed in a stable state. A truss (2) having a track (24) extending in the length direction on a lower surface thereof and having a front support (21) and a rear support (23) provided at front and rear ends of the lower face, respectively, and a track (24) capable of running on the track (24). It has a front moving support 3 and a rear moving support 4 mounted thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast block erection apparatus for a precast block bridge.

[0002]

2. Description of the Related Art Conventionally, there has been a precast block bridge in which precast blocks are sequentially joined to form a bridge between a plurality of piers erected at predetermined intervals for the purpose of simplifying construction and shortening the construction period. Has been built.

[0003] As one of means for erection of the precast block, one using a truss for erection is known.

In this method, for example, as shown in FIG. 7 (a), the erection truss 1a is provided with a rear support 2a and a central support 3a through which blocks can pass.
A temporary support 4a is provided at the front, and a rear support 2a and a newly installed central support 3 near the tip of the overhang portion.
a and a precast block is attached to the support 6a on the temporary support 4a at the front end of the next pier 5a.

In order to move the erection truss 1a forward with the erection of the precast block, the truss 1a is rigidly connected to the rear strut 2a and the moving steel frame 7a fixed to the top of the pier 5a. 7 (b) to 7 (c) on a carriage provided on a rear trolley 2a running on a track 8a fixed to a bridge surface with a transport trolley, and moving the trolley as shown in FIG. 7 (c). It is for erection.

[0006]

However, according to the above-described conventional precast block erection means, when the erection truss 1a is moved forward, the track 8a for running the bogie provided on the rear support 2a is moved. It is necessary to provide on the bridge surface, and the work is complicated. In addition, the rear truss 1a of the erection truss 1a is not stable because it is lifted up at the time of movement, and the erection truss 1a is moved forward to move the precast block. When the erection is resumed, the rear column 2a is placed on the overhanging bridge surface, so the central column 3a
It is necessary to adjust the reaction force of the rear strut 2a to be equal to or less than the reaction force generated in the rear strut 2a. Further, since the reaction force of the rear strut 2a traveling on the bridge surface during the movement acts on the entire length of the bridge body. As a result of taking into account the erection load on the bridge body, the cross-sectional area of the bridge body must be increased to increase the strength of the bridge body, which is economically problematic.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional means for erection of a precast block using an erection truss. A truss provided with an extending track and having a front support and a rear support suspended at front and rear ends of the lower surface, respectively, and a forward movable support and a rear movable support suspended respectively on the track so as to be able to travel. It is characterized by the following.

[0008] Further, in the above configuration, it is further preferable that the front moving support and the rear moving support are pivotable and movable in the width direction of the truss.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIGS. 1 to 6 show one embodiment of the present invention.
As shown in FIG. 1, the front support 21, the intermediate support 22, and the rear support 2 are mainly provided at the front and rear ends and the center of the lower surface.
A truss 2 having a track 24 vertically extending and extending in a longitudinal direction on a lower surface, a forward moving column 3 with a driving device and a rearward moving device with a driving device suspended on the track 24, respectively. And a support 4.

As shown in FIGS. 2 and 3, the forward moving support 3 is suspended by a suspended vehicle 32 attached to a base 31 and a driven vehicle 33 so as to sandwich a track 24 formed on the truss 2. Drive device 3 having a pinion 26 that meshes with a rack 25 provided on the lower surface of the track 24 over the length thereof.
Four.

At the center of the base 31, a connecting frame 35 is suspended from the lower end via a lifting device 36. The lifting device 36 is rotatable with respect to the base 31 by a rotating device 37. It can be moved in the width direction by the width direction moving device 38.

[0013] Then, a suspension device 39 of the precast block 5 or a temporary fixing device 4 to the pier is attached to the connecting frame 35.
0 is selectively concatenated.

On the other hand, the rear moving support 4 is formed on the truss 2 by a suspension vehicle 42 and a driven vehicle 43 attached to a base 41 as shown in FIGS. A drive unit 44 having a pinion 27 which is suspended with the track 24 held therebetween and meshes with a rack 25 provided on the lower surface of the track 24 along the length direction;
In the center of the base 41, a temporary fixing device 50 for a pier is provided at a lower end,
It is arranged so as to be rotatable with respect to the base 41 by the rotating device 47 and to be movable in the width direction by the width direction moving device 48.

The truss 2 has approximately three piers (for example, FIG.
The length of the bridge piers 61, 62, and 63) shown in FIG. 1 and the length of both ends or one end thereof can be expanded and contracted to cope with various pier intervals.

The front support 21, the intermediate support 22 and the rear support 23 are formed so that the front support 3 with the rear support 4 and the precast block 5 lifted can pass therethrough.

In order to construct a precast block bridge using the embodiment of the invention having the above configuration, FIG.
As shown in FIG. 2A, the precast block 5 transported by a trailer to the rear end of the truss 2 with the front support 21, the intermediate support 22 and the rear support 23 temporarily fixed to the piers 61, 62 and 63 respectively is shown in FIG. Is suspended by using the suspension device 39 of the forward moving support 3 shown in FIG.
It is rotated by 90 degrees by the rotating device 37, arranged at a predetermined joining position by the elevating device 36, and joined sequentially. At this time, the rearward moving support 4 is located at the rearmost end of the truss 2.

Then, in order to move the precast block erection apparatus 1 forward along with the erection of the precast block, as shown in FIG. 6B, the front moving support 3 is suspended from the precast block 5 shown in FIG. In the state where the temporary fixing device 40 shown in FIG. 3 is attached instead of the device 39, the temporary moving device 4 is moved forward and temporarily fixed to the tip pier 61,
Is moved forward and temporarily fixed near the center pier 62, and the pier 6 of the front support 21, the intermediate support 22 and the rear support 23 is moved.
The temporary fixing to the truss 2 is released by driving the driving devices 34 and 44 of the front moving support 3 and the rear moving support 4 to move the truss 2 as shown in FIG. It is moved forward until it is located on the pier 64.

At this time, it is not necessary to install a moving rail on the bridge surface as in the case of moving the conventional truss 2, and the forward moving support 3 and the backward moving support 4 are attached to the truss 2. Since the truss 2 is suspended on the provided track 24, it functions as a weight, and in particular, the truss 2 can move in a stable state without the rear support 23 being lifted up. Since it moves while being held by the front moving support 3 supported by 62 and the rear support 4 with a driving device, the reaction force of the rear support acts on the bridge body as in the case where the conventional rear support runs on the bridge surface. There is no need to increase the strength of the bridge body due to the construction load.

Then, the front support 21, the intermediate support 22 and the rear support 23 are temporarily fixed to the piers 62, 63 and 64, respectively, and the temporary fixing of the front moving support 3 and the rear support 4 with the driving device is released. The support 4 is moved to the rear end to make it stand by, the temporary fixing device 40 of the front moving support 3 is converted to the suspension device 39, and the precast block erection work is continued again as shown in FIG.

At this time, the truss 2 is connected to the piers 62, 63, 6
Since it is supported in the vicinity of 4, the work of laying the precast block can be performed in a stable state.

When the truss 2 is moved, the truss 2 is moved by using the rotating device 37 of the forward moving support 3, the lateral moving device 38, the rotating device 47 of the rear supporting column 4 with a driving device, and the lateral moving device 48. By changing the direction, it is possible to cope with a flat curved bridge.

[0023]

As described above, according to the present invention, when the truss is advanced, there is no need to provide a traveling rail on the bridge surface, the operation is simple, and the forward moving support and the backward moving support are used. Can function as a weight, and can move in a stable state without lifting of the rear support when moving.

When the truss is moved, the truss is held by a forward moving column and a rearward moving column supported on or near the pier, respectively, and the rear column travels on the bridge surface as in the conventional method. No truss load is applied to the bridge body because there is no need to increase the strength of the entire bridge body, and the truss is always supported at or near the pier, so that work can be always performed in a stable state .

Further, when the forward moving strut and the backward moving strut are pivotable and movable in the width direction of the truss, it is possible to cope with a flat curved bridge.

[Brief description of the drawings]

FIG. 1 is a side view showing a truss used in an embodiment of the present invention.

FIG. 2 is a side view showing a forward moving support used in the embodiment of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a side view showing a rearward moving support used in the embodiment of the present invention.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is an explanatory diagram of a use state according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast block erection device 2 Truss 3 Forward moving support 4 Backward moving support 5 Precast block 6 Bridge pier 21 Front support 22 Intermediate support 23 Back support 24 Track 34 Drive device 39 Suspension device 40 Temporary device 44 Drive device 50 Temporary device

Claims (2)

[Claims] 1. A truss having a lower surface provided with a track extending in a longitudinal direction and having a front support and a rear support provided at front and rear ends of the lower surface, respectively, and a truss suspended on the track, respectively. A precast block erection device comprising a forward moving support and a backward moving support. 2. The precast block erection apparatus according to claim 1, wherein the front moving support and the rear moving support are pivotable and movable in the width direction of the truss.