JPH0430486B2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a cantilever support method for beam members.

<Conventional Technology> Conventionally, as an example of a technology employed in constructing a bridge, there is a cantilever support construction method for beam members.

This construction method is a technique for constructing bridges without using staging, and the main girder is constructed with one block length of 2~
Divide it into sections of about 10 meters and move the work vehicle around to construct each block.

At this time, in order to resist own weight, working load, poured concrete load, etc., the end of the shoring girder of the working vehicle and the tower, etc. may be suspended with a rope or the like for general support.

When the construction of one block is completed, the work vehicle is moved to the tip and construction begins.

At each construction stage, except during transportation, it is necessary to suspend the end of the shoring girder of the work vehicle with ropes, etc. for support, but the required length of the rope varies depending on the distance the work vehicle must travel. .

Therefore, since it is necessary to connect the rope each time, there are problems in that the work is complicated and it is not economical.

<Purpose> The present invention has been made to solve the above-mentioned problems.
The purpose of this invention is to provide an economical cantilever support method for deep members.

<Example> Hereinafter, a bridge construction method will be described as an example, but it goes without saying that the construction method of the present invention can be adopted for other construction works.

As shown in Fig. 1, the suspension rope used in the present invention has a structure in which the rope 1 is made of stranded prestressed steel wire and crimp grips 2 are attached at predetermined intervals. For other bridges, the ends are lifted diagonally from the temporary pilons.

The crimp grip 2 is formed of a steel plate or the like into a cylindrical shape, and is attached by wrapping it around the rope 1.

The hanging rope fixes the fixed part A on the tower 10 side and the movable part B on the shoring girder 11 side of the work vehicle as follows, and supports the ends.

The fixing part A is provided with a fixing body 3 having an insertion hole having an inner diameter larger than the outer diameter of the pressure grip 2 on the opposite side of the support girder 11 of the tower 10.

At this time, a bearing pressure plate 13 is arranged at the installation part of the fixing body 3.

Next, a hanging rope is passed through the insertion hole of the fixing body 3, and a washer 4 is inserted between the pressure grip 2 and the fixing body 3.
is pinched to prevent the crimp grip 2 from moving toward the shoring girder 11 side.

Next, the hanging rope is pulled toward the shoring girder 11 side and tensioned, and the end of the hanging rope is fixed to the movable part B of the shoring girder 11 in a tensioned state.

In the movable part, for example, as shown in FIG. 3, a wedge 7 is used to fix the material to a threaded fixing body 6 which has an external thread cut so that the tension can be finely adjusted using a ring nut 5.

Next, a case in which the above-mentioned hanging rope is used to support the end portion will be explained with reference to FIG. 1.

First, in order to support the end of the block 12,
The suspension rope used in the present invention is anchored as described above.

When the construction of block 12 is completed, the work vehicle is moved to the tip in order to construct the next block.

At this time, loosen the jack, remove the washer 4 of the fixing part A, and feed the hanging rope through the crimp grip 2 through the hole in the fixing body 3.

After feeding out the length necessary to support the end of the next block, the washer 4 is placed between the pressure grip 2 and the fixing body 3 and tightened with a jack to fix it.

If the necessary lengths of hanging ropes are sent out and fixed in sequence in this manner, there is no need to connect hanging ropes of different lengths each time.

<Other Embodiments> Depending on the movement of the work vehicle, not only the length of the hanging rope but also the attachment angle may vary.

Changes in the attachment angle of the rope can be dealt with by, for example, making the fixed part A a hinge structure as shown in FIG. 4, and making the movable part B a trunnion as shown in FIG.

In addition, it is also possible to deal with this problem by using an inclined washer.

<Effects> As explained above, the present invention uses a hanging rope with a crimp grip in the middle, and as the construction progresses, it is fed out to a required length and fixed.

Therefore, there is no need to connect the rope during construction, which makes construction easy and economical.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
Explanatory diagram of the fixed part, Figure 3: Explanatory diagram of the movable part, Figure 4
Figures 5 to 5: Explanatory diagrams of other embodiments.

Claims (1)

[Claims] 1. In a construction method in which a beam member extending horizontally from an upright structure is supported in a cantilever manner, crimp grips are attached at predetermined intervals.
Using a prestressed steel stranded wire, attach a fixing body having an insertion hole with an inner diameter larger than the outer diameter of the crimp grip to the opposite side of the structure to the end of the beam member, and insert the fixing body into the insertion hole of the fixing body. Penetrate the wire stranded from the PC steel, insert a washer between the crimping grip and the fixing body to stop the crimping grip from moving toward the tip of the beam member, and then pass the wire stranded from the PC steel toward the tip of the beam member. A cantilever support method for beam members, which is characterized by pulling the prestressing steel wire under tension and fixing the end of the prestressed steel strand to the tip of the beam member.