JP3718033B2 - Precast block erection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a precast block erection device in a precast block bridge.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, precast block bridges have been constructed in which precast blocks are successively joined between a plurality of piers standing at predetermined intervals for the purpose of simplifying construction and shortening the construction period.
[0003]
As one of means for installing the precast block, one using a construction truss is known.
[0004]
In this method, for example, as shown in FIG. 7 (a), the truss for erection is provided with a rear column 2a and a central column 3a through which the block can pass, and a temporary column 4a is provided in the front. In addition, the precast block is installed by being attached to the support column 6a on the rear column 2a, the central column 3a near the tip of the newly constructed overhanging portion, and the temporary column 4a at the front end of the next bridge pier 5a.
[0005]
And in order to move the truss for erection 1a forward with the erection of the precast block, it is for transportation that is rigidly connected to the rear column 2a and the steel frame for movement 7a fixed to the top of the pier 5a. A new precast block is installed by placing the trolley and the carriage provided on the rear column 2a traveling on the track 8a fixed on the bridge surface as shown in FIG. 7 (b) to FIG. 7 (c). Is.
[0006]
[Problems to be solved by the invention]
However, according to the conventional precast block erection means, when the truss 1a for erection is moved forward, it is necessary to provide the track 8a on the bridge surface for running the carriage provided on the rear column 2a. In addition to being complicated, the rear strut 1a of the trussing truss 1a is lifted and unstable when moving, and the rear strut 1a is moved when the trussing truss 1a is moved forward to resume the precast block. Since 2a is mounted on the bridge surface overhanging, it is necessary to adjust the reaction force of the central column 3a below the reaction force generated in the rear column 2a, and the rear column that travels on the bridge surface during movement Since the reaction force 2a acts over the entire length of the bridge body, the bridge body strength must be increased by increasing the cross-sectional area of the bridge body as a result of considering the load for installation in the bridge body. Manner also there is a problem.
[0007]
[Means for Solving the Problems]
The present invention was made in order to solve the problems of the means for laying a precast block using the conventional trusses, and a track extending in the lengthwise direction is provided on the lower surface, and lower front strut before the end of the lower surface, intermediate posts in the central portion of the lower surface, the rear pillars to the rear end portion of the lower surface which is a truss provided vertically respectively, each drivable in KakaSo the track A front moving strut in which a precast block suspension device or a temporary fixing device to a pier is selectively disposed and a rear moving strut in which a temporary fixing device to a pier is disposed at a lower end, the front strut, the middle The strut and the rear strut are formed so that the front moving strut in a state where the rearward moving strut and the precast block are suspended can pass therethrough.
[0008]
In the above configuration, it is more preferable that the front moving column and the rear moving column are turnable and movable in the width direction of the truss.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0010]
1 to 6 show one embodiment of the present invention. As shown in FIG. 1, the precast block laying apparatus 1 mainly includes front struts 21 at the front and rear end portions and the central portion of the lower surface, and intermediate portions. A truss 2 having a track 22 and a back column 23 suspended from each other and having a track 24 extending in the length direction on the lower surface, and a front moving column 3 with a driving device suspended so as to be able to run on the track 24 and driving. It is comprised from the back movement support | pillar 4 with an apparatus.
[0011]
As shown in FIGS. 2 and 3, the forward moving column 3 is suspended in a state where the track 24 formed on the truss 2 is sandwiched between the suspension vehicle 32 and the driven vehicle 33 attached to the base 31. And a drive device 34 having a pinion 26 that meshes with a rack 25 that is provided on the lower surface of the rack 25 in the length direction.
[0012]
A connecting frame 35 is suspended from the lower end of the base 31 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 move in the width direction.
[0013]
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 moving column 4 has a track 24 formed on the truss 2 by the suspension vehicle 42 and the driven vehicle 43 attached to the base 41 as shown in FIGS. It has a drive device 44 having a pinion 27 that is suspended in a sandwiched state and meshes with a rack 25 that is provided on the lower surface of the track 24 in the longitudinal direction. A temporary fixing device 50 to the pier is disposed at the lower end so as to be rotatable with respect to the base 41 by the rotating device 47 and movable in the width direction by the width direction moving device 48.
[0015]
The truss 2 has a length that extends over almost three piers (for example, piers 61, 62, and 63 shown in FIG. 6), and can accommodate various pier intervals by making both ends or one end extendable.
[0016]
Further, the front strut 21, the intermediate strut 22 and the rear strut 23 are formed so that the front movable strut 3 in a state where the rear movable strut 4 and the precast block 5 are lifted can pass.
[0017]
In order to construct a precast block bridge using the embodiment of the invention having the above configuration, as shown in FIG. 6 (a), the front strut 21, the intermediate strut 22 and the rear strut 23 are respectively connected to the piers 61, 62 and The precast block 5 transported by the trailer to the rear end of the truss 2 in a state of being temporarily fixed to 63 is suspended using the suspension device 39 of the forward moving column 3 shown in FIG. And then rotated 90 degrees by the rotating device 37 and placed at a predetermined joining position by the lifting device 36 and sequentially joined. At this time, the rearward moving column 4 is positioned at the rearmost end of the truss 2.
[0018]
Then, in order to move the precast block erection device 1 forward as the precast block is erected, as shown in FIG. 6 (b), the front moving column 3 is attached to the suspension device 39 of the precast block 5 shown in FIG. In the state where the temporary fixing device 40 shown in FIG. 3 is attached, it is moved forward and temporarily fixed to the bridge pier 61 at the tip, and the backward movement support column 4 is moved forward and temporarily fixed near the central pier 62 and forward. The temporary fixing of the support post 21, the intermediate support post 22 and the rear support post 23 to the piers 61, 62 and 63 is released, and the driving devices 34 and 44 of the front moving support post 3 and the rear moving support post 4 are driven to make the truss 2 as shown in FIG. As shown in c), the front strut 21 is moved forward until it is located at the previous bridge pier 64.
[0019]
At this time, there is no need to install a moving rail on the bridge surface as in the case of the movement of the conventional truss 2, and the front moving column 3 and the rear moving column 4 are provided on the truss 2. Since it is suspended on the track 24, it functions as a weight. In particular, the truss 2 can be moved in a stable state without the rear column 23 being lifted, and the truss 2 is supported by the piers 61 and 62, respectively. Since the vehicle moves while being held by the forward moving strut 3 and the rear strut 4 with the driving device, the reaction force of the rear strut may act on the bridge body as in the case where the conventional rear strut travels on the bridge surface. There is no need to increase the strength of the bridge body due to the construction load.
[0020]
Then, the front strut 21, the intermediate strut 22 and the rear strut 23 are temporarily fixed to the bridge piers 62, 63 and 64, respectively, and the front movable strut 3 and the rear strut 4 with the driving device are released to release the rear shift strut 4 After moving to the rear end and waiting, the temporary fixing device 40 of the front moving column 3 is converted into the hanging device 39, and the construction work of the precast block is continued in the same manner as shown in FIG.
[0021]
At this time, since the truss 2 is supported in the vicinity of the piers 62, 63, 64, the precast block can be installed in a stable state.
[0022]
Further, when the truss 2 is moved, the moving direction of the truss 2 is changed using the rotating device 37 of the front moving column 3, the lateral moving device 38, the rotating device 47 of the rear column 4 with driving device, and the lateral moving device 48. Therefore, it is possible to deal with planar curved bridges.
[0023]
【The invention's effect】
As described above, according to the present invention, when the truss is moved forward, it is not necessary to provide a traveling rail on the bridge surface, the operation is simple, and the forward moving column and the backward moving column serve as weights. Thus, it is possible to move in a stable state without lifting up the rear column during movement.
[0024]
In addition, when moving, the truss is held by the front moving column and the rear moving column supported on or near the pier, and the rear column does not run on the bridge surface unlike the conventional method. The bridge body is not subjected to a construction load, so that it is not necessary to increase the strength of the entire bridge body, and the truss is always supported at or near the bridge pier, so that the work can always be performed stably.
[0025]
Further, when the forward moving column and the backward moving column are capable of turning and moving in the width direction of the truss, it is possible to cope with a planar 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.
3 is a cross-sectional view taken along line XX of FIG.
FIG. 4 is a side view showing a backward movement support column 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 in 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 construction apparatus 2 Truss 3 Forward moving support | pillar 4 Backward moving support | pillar 5 Precast block 6 Abutment 21 Front support post 22 Intermediate support post 23 Back support post 24 Track 34 Drive device 39 Suspension device 40 Temporary stop device 44 Drive device 50 Temporary stop device

Claims (2)

Front pillars before the end of the lower surface with the track extending longitudinally on the lower surface is provided with an intermediate pillar in the center of the lower surface, the rear strut vertically provided respectively on the rear end portion of the lower surface A truss, a suspension device for a precast block or a temporary fixing device for a bridge pier are selectively arranged at the lower end each suspended so as to be able to run on the track, and a temporary fixing device for a bridge pier is arranged at the lower end And the forward strut, the intermediate strut and the rear strut are formed so that the forward movable strut in a state where the rearward movable strut and the precast block are suspended can pass therethrough. Block erection device.   The precast block erection device according to claim 1, wherein the front moving column and the rear moving column are turnable and movable in the width direction of the truss.

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