JPS583086B2 - girder extrusion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a girder extrusion device that sequentially extrudes girders onto piers or abutments that are erected at predetermined intervals on a planning surface.

In recent years, in order to save labor when constructing railway or road viaducts, a construction method has been developed in which girders, such as concrete girders, are sequentially extruded onto piers or abutments that are erected at predetermined intervals on the planning surface.

For this purpose, one of the applicants is
The girder extrusion device described in No. 0022 was devised.

Although the device is effective in itself, it is necessary to place a predetermined distance on the ground along the plan plane to support the end of the jack behind the jack for pushing out the girder, i.e. on the opposite side in the direction of the girder's progress. It is difficult to fix the reaction tables to the extrusion yard on the ground because it is necessary to fix multiple reaction tables separately from each other. This has the disadvantage that the jack has to be engaged with the reaction table, and therefore the jack is easily disengaged from the reaction table.

For this reason, it is preferable that the ground on which the reaction force platform is fixed is a relatively flat yard, and therefore it cannot be used when there is no suitable place to install the reaction force platform, for example, when a viaduct is installed in a deep valley.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a girder extrusion device that can extrude girders in a preferable manner even when there are relatively few flat supports before and after the place where the girders are to be installed.

According to the present invention, a reaction force bracket is fixed on a pier or an abutment, a reaction force table is fixed on a girder to be extruded, and an extrusion jack is provided between them.

Therefore, the extrusion force of the extrusion jack is received by the pier or abutment, which is originally extremely strong, so that sufficient extrusion force can be obtained.

In addition, the reaction force table is fixed to the extruded girder, but this fixing work is not done by fixing it to concrete, but by welding, so it can be installed sufficiently firmly.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows an example of a construction method using the device of the present invention, in which piers or abutments 1a, 1
5.... is erected.

Shoes 2 are provided at the tops of the piers or abutments 1a, 15, . . . so that the girders can be moved smoothly.

A part of the pier 1 is provided with a girder extrusion device A, which will be explained in FIG.
The girders will be extruded in the order shown in Figures I to ■.

Girder extrusion devices A, A are provided on the upper parts of the piers 1a, 15, etc. shown in FIG. 1, respectively, and the details of each extrusion device A, A will be explained in detail using FIG. do.

In Fig. 2, 1 is a pier and 4 is a girder.

On the other hand, a bracket scaffold 6 is formed on the side of the pier 1 on the girder delivery side, and a jack mount 7 for reloading is disposed on the bracket scaffold 6.

Although this jack mount 7 is not necessarily necessary and may be omitted in some cases, it is preferable to provide it in order to perform the work efficiently.

A reaction bracket 5 is disposed on the flat surface of the pier 1, and a push-out jack 9 is connected to the reaction bracket 5 via a pin 8.
A piston 11 is attached to the shaft, and one cylinder 12 has a member 15a fixed to an extrusion stopper 13 and a bottom plate 15.
It is pivoted by a pin 10.

An extrusion stopper 13 is formed with a raised portion on one side of the bottom plate 15, and an earthquake stopper 14 is similarly formed with a raised portion on the other side of the bottom plate 15.

The above-mentioned jack mount 1 is arranged below the bottom plate 15 that constitutes a part of the extrusion device A, and the jack mount 1 has running wheels 20 mounted on a bracket scaffold 6 at the bottom of the base 19.
, 20... are mounted on the tower so that they can run freely.

The jack mount 1 is an extensible body 1 whose length can be expanded and contracted by hydraulic pressure, etc.
8 is configured such that its vertical height can be changed and fixed with respect to the base 19, and since the extrusion stopper 13, earthquake stopper 14, etc. are placed on the jack mount 7, the height of the jack mount 7 is The position of the extrusion stopper 13 and the like is changed vertically by the vertical movement.

On the other hand, a reaction rail 11 is attached to the side of the girder 4 by a fixed part 21.
A reaction force table 16 is continuously provided on the side of the reaction rail 17 at a constant interval, that is, the stroke width of the above-mentioned extrusion jack 9. It comes into contact with the stop bar 13 and is pressed in the shift direction.

As shown in FIG. 1, the extrusion device A is
are placed at the top of each.

Next, Fig. 3 I shows an example of construction using the above extrusion device A.
, II and ■.

The extrusion device A shown in FIG. 3 differs from the device shown in FIG. 2 in that the reaction force bracket 5 is attached to the side of the pier 1, but its operation and effect are the same as in FIG. 2. It is.

This reaction bracket 5 is provided with an extrusion jack 9 and a bracket scaffold 6, the reaction rail 11 is fixed to the bottom of the girder 4 by a fixing part 21, and a reaction table 16 is further fixed to the lower part of the reaction rail 11. There is.

Also in this extrusion device A, the reaction force table 16 is pushed to the right side in the drawing by the action of the extrusion jack 9, and on the other hand, the position of the extrusion stopper 13 etc. is changed up and down by the extensible body 18 on the side of the jack mount 7. Reaction force table 1
6 is engaged or disengaged.

Other parts in FIG. 3 with the same reference numerals as in FIG. 2 have the same configuration.

In addition, in FIG. 3, 22 is a sliding ribbon.

Next, to explain the work procedure, first, as shown in FIG. 3I, the frontmost reaction force table 16 is engaged with the extrusion stopper 13 on the extrusion device A side, and the jack mount 7 for reloading is placed at this position. The expandable body 18 is fixed.

Next, as shown in FIG. 3 (3), hydraulic pressure from an electric pump unit (not shown) is introduced to the pusher jack 9 to pressurize the pusher jack 9 and stroke the jack, thereby pushing the girder 4 to the right in the drawing.

Accordingly, the jack mount 1 also moves to the right.

Next, as shown in Fig. 3 (■), when the extrusion jack 9 has fully extended its stroke, the extensible body 18 of the jack mount 1 is actuated by power such as hydraulic pressure (not shown), and the extrusion stopper 13 etc. are moved parallel to the horizontal direction. In this state, the extrusion stopper 13 is moved downward to release the engagement between the extrusion stopper 13 and the reaction force table 16, and after being released, the extrusion jack 9 is moved to the opposite stroke.

As a result, the jack mount 1 moves back to the left in the drawing as shown by the arrow.

Next, as shown in Fig. 3 (■), when the push-out jack 9 returns to the original set position, the jack mount 7 is raised again to the state shown in Fig. 3 (I), and the same operation is repeated again to move the girders 4 one after another. and send it forward.

In this case, the extrusion devices A, A, . . . provided on the piers 1a, 1b, .

Further, limit switches may be provided on the extrusion jack 9 and the reloading jack to automatically perform the operation.

If an earthquake occurs during the above-mentioned work and the girder 4 attempts to move forward, the reaction force table 16 on the girder 4 side engages with the earthquake stopper 14 to prevent the girder 4 from moving forward.

This makes it possible to deal with earthquakes.

As described above, according to the present invention, one end of the extrusion jack is fixed to the pier or abutment, the other end engages with the reaction force stand of the girder, and the extrusion device is provided on each pier or abutment, so the extrusion reaction of the girder is The force can be dispersed, almost no extrusion yard is required, and since the extrusion jack is fixed to something structurally strong, it is mechanically efficient and reduces stress on the girder.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a side view showing an example of construction using an extrusion device according to the present invention, FIG. 2 is a perspective view of an extrusion device A according to the present invention, and FIG. Figure I, n,
I and ■ are side views showing the working order in a construction example using the present extrusion device. A...Extrusion device, 1, 1a, 15...
... Pier (or abutment), 2... Shoe, 3...
...hand begator, 4...digit, 5...
...Reaction force bracket, 6...Bracket scaffolding, 7...Jack mount, 8...-pin,
9... Push-out jack, 10... Pin, 11... Piston, 12... Cylinder, 13... Push-out stopper, 14...・・・
・Earthquake stopper, 15... Bottom plate, 16...
...Reaction force table, 11...Reaction force rail, 18.
...Stretchable body, 19...Base, 20...
...Running wheel, 21...Fixed part, 22...-
...Sliding ribbon.

Claims (1)

[Claims] 1. In a girder extrusion device that sequentially extrudes girders onto piers or abutments erected at predetermined intervals on a planned surface, an extrusion jack is pivoted to a reaction bracket fixed to the piers or abutments; An extrusion stopper that is pivoted to the extrusion jack constitutes an extrusion device, and a reaction force table that can engage with the extrusion stopper is fixed to the girder to be extruded at a position corresponding to the extrusion stopper. A girder extrusion device is provided on a bridge pier or abutment in which a required number of girder extrusion devices are erected, and is characterized in that a counter bracket for receiving an extrusion jack is arranged on the side of the bridge pier or abutment.