JP3605660B2 - Precast block erection equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a precast block erection device for a precast block bridge.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a precast block bridge has been constructed 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.
[0003]
As one of the means for erection of the precast block, one using an erection truss is known.
[0004]
In this method, for example, as shown in FIG. 7A, the erection truss 1a is provided with a rear support 2a and a central support 3a through which blocks can pass, and a temporary support 4a is provided in front of the truss 1a. A precast block is erected on the support 2a, the newly installed central support 3a near the tip of the overhang, and the support 6a on the temporary support 4a at the front end of the next pier 5a.
[0005]
In order to move the erection truss 1a forward with the erection of the precast block, the transportation truss rigidly connected to the rear support 2a and the moving steel frame 7a fixed to the top of the pier 5a. A new precast block is erected on a trolley and a truck provided on a rear support 2a running on a track fixed to a bridge surface and advanced as shown in FIGS. 7 (b) to 7 (c). It is.
[0006]
[Problems to be solved by the invention]
However, according to the above-described conventional precast block erection means, when moving the erection truss 1a forward, it is necessary to provide a track on the bridge surface for running the bogie provided on the rear support 2a, and the work is complicated. In addition, when the truss 1a is unstable during the movement, and when the truss 1a is moved forward and the erection of the precast block is resumed, the truss 1a is placed on the overhanging bridge surface of the rear support 2a. Therefore, it is necessary to adjust the reaction force of the central support 3a to be equal to or less than the reaction generated in the rear support 2a, and furthermore, the reaction of the rear support 2a traveling on the bridge surface during the movement is limited to the total length of the bridge body. Since the bridge works over the entire length of the bridge, the strength of the bridge must be increased by, for example, increasing the cross-sectional area of the bridge, as a result of taking into account the erection load on the bridge.
[0007]
[Means for Solving the Problems]
The present invention has been made in order to solve the problem of the means for erection of a precast block using the conventional erection truss, and has a front strut, a rear strut and a front and rear end portion and a central portion of a lower surface. A truss having a length extending over approximately three piers, each of which has an intermediate support suspended vertically and having a track extending longitudinally on a lower surface thereof; and a drive-supported front support suspended on the track, respectively. And a rear strut with a driving device, wherein the front strut with the driving device and the rear strut with the driving device have a temporary fixing device for a pier and a driving device for a track of the truss at a lower end, respectively, and a front strut with a driving device. front strut while the that lifting the precast blocks together can be converted to the tacking device in precast block lifting device, the rear struts and intermediate struts An over-capable, rear strut with the driving device is characterized in that it is passed through the rear pillars.
[0008]
Further, in the above configuration, it is further preferable that the front support column with the drive device and the rear support column with the drive device are pivotable and movable in the width direction of the truss.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0010]
FIGS. 1 to 6 show an embodiment of the present invention. As shown in FIG. 1, a precast block erection apparatus 1 mainly includes a front support 21 at front and rear end portions and a center portion of a lower surface, and a middle support. A truss 2 having a support 22 and a rear support 23 vertically extending and having a track 24 extending in a longitudinal direction on the lower surface, a front support 3 with a drive device and a drive device suspended on the track 24 so as to be able to travel, respectively. And a rear support 4.
[0011]
The front support column 3 with a driving device is suspended in a state in which a suspension vehicle 32 and a driven vehicle 33 attached to a base 31 sandwich a track 24 formed on the truss 2 as shown in FIGS. A drive unit 34 having a pinion 26 that meshes with a rack 25 provided on the lower surface of the track 24 over the length thereof is provided.
[0012]
In the center of the base 31, a connecting frame 35 is hung at the lower end via an elevating device 36. The elevating device 36 is rotatable with respect to the base 31 by a rotating device 37 and moves in the width direction. The device 38 can be moved in the width direction.
[0013]
Then, the suspension device 39 of the precast block 5 or the temporary fixing device 40 to the pier is selectively connected to the connection frame 35.
[0014]
On the other hand, the rear support column 4 with the driving device is formed on the truss 2 by the suspension vehicle 42 and the driven vehicle 43 attached to the base 41 as shown in FIGS. And a driving device 44 having a pinion 27 that meshes with a rack 25 provided on the lower surface of the track 24 in the longitudinal direction. In the center, a temporary fixing device 50 for the pier is arranged at the lower end 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.
[0015]
The truss 2 has a length extending over approximately three piers 6, and can be adapted to various pier intervals by making both ends or one end extendable.
[0016]
Further, the front support 21, the intermediate support 22, and the rear support 23 are formed such that the rear support 4 with the drive and the front support 3 with the drive device in a state in which the precast block 5 is lifted can pass therethrough.
[0017]
In order to construct a precast block bridge using the embodiment of the invention having the above configuration, as shown in FIG. 6A, a front support 21, an intermediate support 22 and a rear support 23 are respectively connected to piers 61, 62 and The precast block 5 conveyed by a trailer to the rear end of the truss 2 while being temporarily fixed to the truss 63 is suspended using the suspension device 39 of the front support column 3 with the drive device shown in FIG. Is rotated by 90 degrees by the rotating device 37, and is arranged at a predetermined joining position by the elevating device 36, and is sequentially joined. At this time, the rear column 4 with the driving device is located at the rearmost end of the truss 2.
[0018]
Then, in order to move the precast block erection device 1 forward along with the erection of the precast block, as shown in FIG. 6B, the front support column 3 with a driving device is used to suspend the precast block 5 shown in FIG. 3 and is temporarily fixed to the tip pier 61 while the temporary fixing device 40 shown in FIG. 3 is attached, and the rear support 4 with the driving device is moved forward and temporarily near the central pier 62. Then, the temporary fixing of the front support 21, the intermediate support 22 and the rear support 23 to the piers 61, 62 and 63 is released, and the drive devices 34 and 44 of the front support 3 with drive and the rear support 4 with drive are driven. Then, the truss 2 is moved forward until the front strut 21 is positioned on the pier 64 as shown in FIG.
[0019]
At this time, there is no need to install a rail for movement on the bridge surface as in the case of moving the truss 2 in the related art, and the front support column 3 with the driving device and the rear support column 4 with the driving device are not required. The truss 2 can be moved in a stable state by acting as a weight because the truss 2 is suspended on the track 24 provided at the truss 2. 3 and the rear support column 4 with the driving device, it moves while being held, so that the reaction force of the rear column does not act on the bridge body as in the case where the conventional rear column runs on the bridge surface. Therefore, there is no need to increase the strength of the bridge.
[0020]
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 support of the front support 3 with the drive and the rear support 4 with the drive is released. The rear support column 4 is moved to the rear end to stand by, the temporary fixing device 40 of the front support column 3 with the driving device is converted into the suspension device 39, and the precast block erection work is performed again as shown in FIG. To continue.
[0021]
At this time, since the truss 2 is supported near the piers 62, 63, and 64, the precast block can be erected in a stable state.
[0022]
Further, when the truss 2 is moved, the moving direction of the truss 2 is determined by using the rotating device 37 of the front support column 3 with the driving device, the lateral moving device 38, the rotating device 47 of the rear column 4 with the driving device, and the lateral moving device 48. By changing the bridge, it is possible to cope with a bridge with a curved plane.
[0023]
【The invention's effect】
As described above, according to the present invention, when the truss is advanced, it is not necessary to provide a traveling rail on the bridge surface, the operation is simple, and the front support column with the drive device and the rear support column with the drive device are provided. It can move in a stable state by acting as a weight.
[0024]
In addition, when moving, the truss is held by the front supporting column with the driving device and the rear supporting column supported by or near the pier, respectively, and the rear column runs on the bridge surface as in the conventional method. In addition to the fact that there is no need to increase the strength of the entire bridge body, there is no need to increase the strength of the entire bridge body, and since the truss is always supported on or near the pier, the work is always stable. I can do it.
[0025]
Further, when the front support column with the driving device and the rear support column with the driving device 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 front support column with a driving device 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 rear support column with a driving device 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 Front support with drive 4 Rear support 5 with drive 5 Precast block 6 Pier 21 Front support 22 Intermediate support 23 Rear support 24 Track 34 Drive 39 Suspension device 40 Temporary fixing device 44 Drive device 50 Temporary fixing device

Claims (2)

A front truss, a rear stanchion, and an intermediate stanchion are respectively suspended from front and rear ends and a center portion of the lower surface, and a truss having a length extending over approximately three piers having a track extending in the length direction on the lower surface; consists travelable, respectively the front strut with driving device is KakaSo the drive unit with the rear strut to the track, the front struts and drive with the rear strut with the drive of the tacking device and the truss to piers on the lower end Each has a driving device for the track, and the front strut with the driving device can convert the temporary fixing device into a precast block lifting device and can pass through the front strut, the rear strut and the intermediate strut while the precast block is lifted. Wherein the rear column with the driving device is able to pass through the rear column . The precast block erection apparatus according to claim 1, wherein the front support column with the driving device and the rear support column with the driving device are pivotable and movable in the width direction of the truss.

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