JP3165766B2 - Construction method of temporary bridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a temporary bridge used for constructing a road on a rugged terrain such as a mountain or a bay.

[0002]

2. Description of the Related Art Generally, when a highway or a railway is provided in an area having undulating terrain such as a mountain area or a bay area, a bridge is laid.

[0003] A temporary bridge for foundation work is constructed on the laying of such a bridge. For example, a pile is driven from a completed abutment using a plurality of H steels at a pitch of about 5 m, for example, with a pile driver. After passing the I-beam to each of the piles into which they were driven, hang a lining plate over them, and then a pile driver advances on the lining plate, drive the next pile, and join the gantry. It was to add.

[0004]

However, in the conventional method of constructing a gantry using such a conventional pile driving method, it takes time to drive a large number of piles sequentially for the construction of the gantry. In addition, since such piles need to be driven at a relatively narrow pitch, the entire surface of the ground under the gantry will be roughened. There were problems such as.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to efficiently install a gantry for constructing a temporary bridge, and to make the ground under the gantry rough, and It is an object of the present invention to provide a method for constructing a temporary bridge capable of realizing reuse and diversion of gantry steel after use.

[0006]

According to the present invention, there is provided a method for constructing a temporary bridge, comprising the steps of: constructing an abutment such as an abutment to support a rear gantry forming a double slide structure together with a front gantry; After advancing the front gantry a predetermined amount,
The front legs provided on said front gantry is lowered to the ground fixed, then raised rear leg provided on the rear gantry, the
With the rear gantry supported by the above structure, move forward a predetermined amount.
Was ground and fixed by again lowering the rear legs, temporary bridges were supported by the front and rear to the forward of the rear gantry above construct
To the rear of the rear gantry, and then connect the front legs
After raising the front gantry by a predetermined amount,
By lowering the legs and fixing the ground, and further raising the rear legs to advance the rear gantry a predetermined amount ,
After the temporary bridge supported by the structure is advanced, the rear leg is lowered again to fix the ground, and before and after these steps, a new temporary bridge supported by the structure is re-attached to the temporary bridge.
Connected to the rear of the bridge, and
Performs peristaltic motion by the rear gantry and connects the above temporary bridge
A temporary bridge characterized by constructing a temporary bridge by
The method of beam construction.

[0007]

According to the construction method of the temporary bridge of the present invention, a front gantry having a front leg capable of elevating and lowering and a rear gantry having a rear leg capable of elevating and lowering are slidably connected to each other, When one of the front gantry and the rear gantry slides forward, one of the front legs or the rear leg is raised, and the other rear leg or the front leg is grounded and fixed to the ground. The alternate operation of raising the leg and the rear leg and fixing the ground contact allows the construction of the temporary bridge to be sequentially performed while moving the front gantry and the rear gantry forward.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are a plan view, a front view, and a left side view showing a gantry apparatus used for carrying out a method for constructing a temporary bridge according to the present invention, wherein 1 is a front gantry, and 2 is a rear gantry. And these form a double slide structure with each other,
Here, the front gantry 1 is provided inside the rear gantry 2 so as to be horizontally movable.

[0009] 3 is a fixed roller which is rotatably fixed to the vertical position of the opening of the rear gantry 2, the front gantry 1
Are guided by the fixed rollers 3 so that they can enter and exit the rear gantry 2 smoothly. Reference numeral 4 denotes a plurality of rollers juxtaposed on the upper surface of a support portion (for example, an existing abutment) below the rear gantry 2, which facilitates movement of the rear gantry 2 on the abutment.

Further, reference numerals 5 and 6 denote a front elevating device and a rear elevating device which are attached to the side of one end of the front gantry 1 and the rear gantry 2, respectively, as shown in FIG. Parts 7, 8 and their hydraulic drive parts 7,
8 includes a front leg 9 and a rear leg 10 which are driven up and down by 8, respectively.

Reference numerals 11 and 12 denote a pair of winches provided at the front of the front gantry 1 and the rear gantry 2, respectively. A wire rope 13 wound around a drum of the winch 11 is provided.
One end of the wire rope 15 wound around the drum of the winch 12 is fixed to a part of the rear gantry 2 as shown in FIG. The front gantry 1 is guided into the rear gantry 2 via the fixed pulley 16, and is further fixed to the rear end inner surface of the front gantry 1 by a fastening member 17.

Accordingly, the wire rope 15 is wound around the drum by driving the winch 12 and the wire rope 13
Is extended, the front gantry 1 can be pulled out from the rear gantry 2 forward (to the left in FIG. 4), while the winch 11 drives the wire rope 13 around the drum, and Extending 15 allows the rear gantry 2 to move forward with respect to the front gantry 1.

Next, the operation will be described with reference to the process chart of FIG. 5 showing a procedure for constructing a temporary bridge.

First, the front gantry 1 is placed on the constructed abutment 20.
The rear gantry 2 that accommodates the rear gantry 2 is installed via a number of rollers 4 as shown in FIG. 1, and the rear leg 10 on the rear gantry 2 side is lowered by operating the hydraulic drive unit 8 to lower the lower end of the ground And fixed to the ground as shown in FIG.

Next, the front leg 9 on the front gantry 1 side is raised by operating the hydraulic drive unit 7 as shown in FIG. 5 (a), and subsequently the winch as shown in FIG. 12
To move the front gantry 1 forward (to the left in the figure) by winding up the wire rope 15. Also,
This movement is stopped at the set position, and the front leg 9 is further lowered by the hydraulic drive unit 7, and the lower end thereof is fixed to the ground, as shown in FIG. 5 (b).

Subsequently, the rear leg 10 is raised by the hydraulic drive unit 8 as shown in FIG. 5C, and in this state, the rear gantry 2 is accommodated in the front gantry 1 which has moved forward. Move as shown in FIG. 5 (d). In this case, the rear end of the rear gantry 2 remains in the bridge base 20. This movement is performed by driving the winch 11 as shown in FIG. 4 to the stopped front gantry 1 and pulling the rear gantry 2 with the wire rope 13 while guiding the rear gantry 2 to the fixed roller 7.

The winch can be changed to a hydraulic jack or a screw screw.

In the state shown in FIG. 5D, the temporary bridge 21 is attached to the rear part of the rear gantry 2 with bolts or PC steel.
After the front gantry 1 is advanced in this state, the front leg 9 is raised as shown in FIG. 5 (e) in the same manner as described above. Stop at the position,
Further, by fixing the lower end of the front leg 9 to the ground, FIG.
(F). In addition, in the joining procedure of the temporary bridge 21, the rear gantry 2 may be joined in advance before moving forward, but in this case, an extra space is required on the gantry 20.

The rear gantry 2 and the temporary bridge 21 joined to the rear gantry 2 are then raised as shown in FIG. 5 (g) so that the rear leg 10 is raised again as described above to reach the position near the front leg 9. After that, the rear leg 10 is lowered, and the lower end thereof is fixed to the ground. In this state of FIG. 5 (g), a new temporary bridge 22 is rigidly fastened to the rear groove base 3.

By moving the gantry forward and connecting like a scale insect in this way, a temporary bridge can be installed at a predetermined position.

In this case, the rear gantry 2 and the temporary bridges 21 and 22 are factory-produced, for example, with a length of about 30 m, and by connecting them, the temporary bridge can be quickly constructed without roughening the ground. After the construction is completed and withdrawn, the steel for gantry can be used for various purposes.

For example, it is possible to make a conventional temporary gantry from the tunnel exit and attach it to the foundation of a bridge, or to attach directly to the foundation of a bridge without attaching a temporary road. Rapid construction can be performed and less environmental destruction is required.

[0023]

As described above, according to the present invention, the rear gantry, which forms a double slide structure together with the front gantry, is supported by the constructed abutment or the like, and the front gantry is mounted on the rear gantry. After a certain amount of forward movement, the front leg provided on the front gantry is lowered to be fixed to the ground, and then the rear gantry is moved forward by a predetermined amount by raising the rear leg provided on the front gantry. Lower the rear leg and fix it on the ground, fix a temporary bridge at the rear of the rear gantry, raise the front leg of the front gantry and advance it by a predetermined amount, and then lower this front leg again. After fixing the ground, further raising the rear leg of the rear gantry and moving it forward by a predetermined amount, lowering the rear leg again to fix the ground, and reconstructing a new temporary bridge at the rear of the temporary bridge. The efficiency of installation of gantry for temporary bridge construction , Reuse of gantry steel material after use, while providing diversion, it is possible to obtain an effect that the construction of the smooth temporary bridges.

[Brief description of the drawings]

FIG. 1 is a plan view showing a gantry used for realizing a method for constructing a temporary bridge according to an embodiment of the present invention.

FIG. 2 is a front view showing the gantry in FIG.

FIG. 3 is a left side view showing the gantry device in FIG. 1;

FIG. 4 is a conceptual diagram showing a slide structure of a front gantry and a rear gantry in FIG.

FIG. 5 is an explanatory view showing a construction procedure of a temporary bridge according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front gantry 2 Rear gantry 9 Front leg 10 Rear leg 20 Abutment 21,22 Temporary bridge

Claims (1)

(57) [Claims] 1. A construction, such as an abutment, which has been installed, supports a rear gantry forming a double slide structure together with a front gantry, and moves the front gantry forward by a predetermined amount with respect to the rear gantry. lowers the front legs provided on the gantry to the ground fixed, then raised the rear legs provided on the rear gantry, the
With the rear gantry supported by the above structure, move forward a predetermined amount.
Was ground and fixed by again lowering the rear legs, temporary bridges were supported by the front and rear to the forward of the rear gantry above construct
Was connected to a rear portion of the rear gantry, subsequently, after the front gantry by a predetermined amount advanced by increasing the said front leg, and the ground fixed by again lowering the Zenbuashi, further, the rear legs the Rukoto by a predetermined amount advance the rear gantry is raised and the
After advancing the temporary bridge, which is supported in the construct, again this rear leg is lowered to the ground fixed, these steps the new temporary bridges which are supported by the construct behind the temporary
Connected to the rear of the bridge, and
Performs peristaltic motion by the rear gantry and connects the above temporary bridge
A method for constructing a temporary bridge, comprising: constructing a temporary bridge.