JP3153803B2 - Method and apparatus for transporting precast slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel transfer method and apparatus for transferring a precast type concrete slab, a steel slab, a sandwich slab or the like onto a steel girder.

[0002]

2. Description of the Related Art Recently, a precast type slab is used when a bridge slab is replaced or newly constructed. Although there are various methods of erection of this precast slab, depending on the type of girder, there are cases where the load of a truck or the load of a crane for erection cannot be applied to the girder. In such a case, several methods have been adopted as described below.

[0003] One is a method in which a crane truck A is installed under a bridge and a precast floor slab C is erected on a bridge girder B as shown in FIG. This method has problems in that the place where the crane is installed is limited, and the work radius becomes large, so that a large crane is required.

[0004] As another method, there is a method in which a precast floor slab C is erected on a bridge girder B using a cable crane D as shown in FIG. This method has a problem that erection is enormous and enormous cost and time are required.

Further, as shown in FIG. 11, there is a method of transporting a precast floor slab C to a bridge girder B by using a special transport vehicle E and erection. In this case, there is a problem that the vehicle must be manufactured with a manufacturing license in order to be applied to the crane rules.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a method and apparatus for transporting a precast slab which can easily transport the precast slab to an appropriate position on a bridge girder. It is something to offer.

[0007]

SUMMARY OF THE INVENTION The present invention provides the following means for transporting a precast slab to an appropriate location on a bridge girder.

First, the precast slab is conveyed by a conveying device comprising a support plate for supporting the precast slab from above and a jack having wheels running on a steel girder flange. After attaching the support plate to the precast slab from the upper surface of the precast slab and attaching a pair of guide rollers to the lower surface of the slab with the steel girder flange sandwiched from both sides, actuate the jack to operate the wheel to the steel girder. On the flange,
The precast slab is lifted from the steel girder flange, and the conveyor is run on the steel girder flange via wheels.

Here, the apparatus is provided with a support plate which is inserted into a hole for a dowel of a precast slab to be conveyed and supports the precast slab from above and a wheel running on a steel girder flange on the other. It consists of a jack. The jack is, for example, a screw jack or a hydraulic jack.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a concrete precast slab 2 placed on a steel girder 1 and conveyed to an appropriate position on the steel girder 1 therefrom. This precast floor slab 2
A hole 2a for a dowel is formed at a position corresponding to the flange 1a. The precast floor slab 2 is transported to an appropriate place on the steel girder 1 as follows.

First, a method of transporting a precast slab using a transport device using a screw jack will be described with reference to FIGS. 2 and 3.

The conveying device 3 has a screw jack 4 whose inner diameter is screwed to the screw of the rotating shaft 4b on the screw type jack 4 in which the rotating shaft 4b rotates about the cylindrical body 4c by rotating the handle 4a. The support plate 5 to which the moving cylinder 6 is fixed is
b is inserted and screwed together, and the wheel shaft 7a is attached to a wheel bearing 7b having the wheel 7 fixed to the lower surface of the cylinder 4c.
It is provided by supporting.

As shown in FIG. 3, a plurality of the transporting devices 3 are inserted into the dowel holes 2a formed in the precast floor slab 2 placed on the steel girder 1 and
Is mounted on the flange 1a of the steel girder 1 and the support plate 5 is spanned over the dowel hole 2a. At the time of bridging the support plate 5 to the dowel hole 2a, the wheel 7 may be floating. The contact between the surface of the precast slab 2 and the support plate 5 is performed by rotating the handle 4a. In this example, the support plate 5 is attached to the precast slab 2 by means of an anchor 8 and a bolt 9 previously driven into the precast slab. The support plate 5 has a through hole for the bolt 9.

On the lower surface of the precast floor slab 2, a pair of guide rollers 11 is sandwiched by flanges 1a of the steel beam 1 from both sides. In this example, a mounting bracket 12 supported via a roller shaft 11a, a precast The anchor 13 is attached to the floor slab and attached via bolt 14 attaching means.

In this manner, the preparation for transporting the precast floor slab 2 on the steel girder 1 is completed. The transfer is performed as follows.

In FIG. 2, the handle 4a of the transfer device 3
Is rotated so that the moving cylinder 6 moves upward, the moving cylinder 6 moves upward along the rotating shaft 4a. When the moving cylinder 6 moves upward, the moving cylinder 6 is fixed to the support plate 5, and Since the plate 5 is attached to the precast slab 2, the precast slab 2 is raised from the flange 1 a of the steel girder 1. The rotation of the handle 4a is performed until the guide roller 11 attached to the lower surface of the precast floor slab 2 reaches the position of the flange 1a of the steel girder 1.

When the precast slab 2 rises above the steel girder 1, the transport device 3 is moved on the steel girder 1 and transported to a predetermined position on the steel girder 1. At this time, precast floor slab 2
The guide roller 11 attached to the lower surface of the wheel 7 prevents the wheel 7 from coming off the steel beam 1 and makes the traveling of the wheel 7 smooth.

Next, a method of transporting a precast slab using a transport device using a hydraulic jack will be described with reference to FIGS. 4 and 5.

The transfer device 3 comprises a cylinder 4d and a piston 4
e, and a support plate 5 that bridges over the dowel hole 2a of the precast slab 2 is fixed above the cylinder 4d of the hydraulic jack 4 that operates the piston 4e by hydraulic pressure, and the wheel 7 is attached to the piston 4e. It is provided by supporting a wheel shaft 7a on a wheel bearing 7b fixed below. When the piston 4e is in the upper position and the cylinder 4d is in the lower position, the support plate 5 is provided on the piston 4e and the wheel 7 is provided on the cylinder 4d.

As shown in FIG. 5, a plurality of the transfer devices 3 are inserted into the dowel holes 2a formed in the precast floor slab 2 placed on the steel girder 1 and
Is mounted on the flange 1a of the steel girder 1 and the support plate 5 is spanned over the dowel hole 2a. At the time of bridging the support plate 5 to the dowel hole 2a, the wheel 7 may be floating. The contact between the surface of the precast floor slab 2 and the support plate 5 is performed by adjusting the height of the piston 4 e of the hydraulic jack 4. The attachment of the support plate 5 to the precast slab 2
This is the same as the above-described embodiment.

A guide roller 11 is attached to the lower surface of the precast floor slab 2, and the manner of attachment is the same as in the above-described embodiment.

In this manner, the preparation for transporting the precast floor slab 2 on the steel girder 1 is completed. The transfer is performed as follows.

In FIG. 4, the piston 4e of the hydraulic jack 4 forming the transfer device 3 is operated to operate the cylinder 4d.
Is pushed upward, the support plate 5 is fixed to the cylinder 4d, and the support plate 5 is attached to the precast floor slab 2, so that the precast floor slab 2 is raised from the flange 1a of the steel beam 1. The floating of the precast slab 2 is performed until the guide roller 11 attached to the lower surface of the precast slab 2 reaches the position of the flange 1 a of the steel girder 1.

When the precast floor slab 2 rises above the steel girder 1, the conveying device 3 is moved on the steel girder 1 and conveyed to a predetermined place on the steel girder 1. At this time, precast floor slab 2
The guide roller 11 attached to the lower surface of the wheel 7 prevents the wheel 7 from coming off the steel beam 1 and makes the traveling of the wheel 7 smooth.

Next, referring to FIG. 6, an embodiment will be described in which a transport device comprising a hydraulic jack is used for transporting a sandwich precast slab.

In this example, the transfer device and the transfer method are the same as those in the embodiment using the hydraulic jack described above, but the method of attaching the sandwich precast floor slab 20 of the support plate 5 and the guide roller 11 is different. The difference lies in that the sandwich precast floor slab 20 is mounted using bolts 25 and 26 using a cylindrical nut 24 positioned between the upper and lower steel plates 22 and 23.

In the sandwich precast floor slab 21, concrete and upper and lower steel plates
A cylindrical nut 24 is interposed between the upper and lower steel plates 22 and 23 in order to combine the steel plates 2 and 23.
The upper steel plate 22, concrete, and lower steel plate 23 are fastened. Therefore, the support plate 5 and the guide roller 11 can be attached using the cylindrical nut 24 and the bolts 25 and 26.

Next, a specific example of transporting the precast slab to a predetermined position by causing the transport device to travel on a steel girder flange via wheels will be described.

FIG. 7 shows an example using a winch. In this example, a winch G is installed under one of the abutments, and a precast floor slab C is connected through a wire H from the end of the opposite steel girder B.
Alternatively, the precast slab C is conveyed to a predetermined position by pulling the conveying device K, and the precast slab C is sequentially arranged on the steel girder B.

FIG. 8 shows an example using a driving device. In this example, a driving device J is connected to a precast slab C or a conveying device K, and the precast slab C is transported to a predetermined position by running on a flange of a steel girder, and the precast slab is sequentially placed on the steel girder. C is arranged.

After the precast slab has been conveyed to a predetermined position in this manner, the jack 4 is operated to place the precast slab 2 on the steel beam 1 as shown in FIGS. Then, the conveying device and the guide roller are detached from the precast slab by releasing the attaching means. In the case of the sandwich precast floor slabs, after removing them, the whole is fastened again by bolts via the cylindrical nuts so as not to hinder the synthesis of the upper and lower steel plates and concrete.

[0033]

Since the present invention has been made as described above,
It has the following effects.

According to the present invention, the jack is inserted into a dowel hole formed in the precast floor slab formed by the jack and the wheel, and a support plate provided on the jack is attached to the precast floor slab to operate the jack. This is a transport method in which the precast floor slab is lifted up, and wheels are run on the steel girder flange instead of rails, so the transport device is easy to transport, and the use place of the device is restricted. Less is.

Since a pair of guide rollers is attached to the lower surface of the floor slab with the steel girder flange interposed therebetween, it is possible to prevent the transfer device from coming off the steel girder flange of the transfer device when the precast slab is transferred. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state where a precast slab to be conveyed is placed on a steel girder.

FIG. 2 is a cross-sectional view showing a state during transport of a precast slab in the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state after a precast slab is conveyed in the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a state in which a precast slab is conveyed in another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state after conveyance of a precast slab in another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state in which a precast floor slab is conveyed in still another embodiment of the present invention.

FIG. 7 is a schematic diagram showing a transport method in each embodiment of the present invention.

FIG. 8 is a schematic diagram showing another transport method in each embodiment of the present invention.

FIG. 9 is a schematic diagram illustrating a conventional example.

FIG. 10 is a schematic diagram illustrating another conventional example.

FIG. 11 is a schematic diagram illustrating still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel girder 1a Flange 2 Precast floor slab 2a Dowel hole 3 Conveyor 4 Jack 4a Handle 4b Rotary shaft 4c Cylindrical body 4d Cylinder 4e Piston 5 Support plate 6 Moving cylinder 7 Wheel 7a Wheel shaft 7b Wheel bearing 8 Anchor 9 Bolt 11 Guide Roller 11a Roller shaft 12 Mounting bracket 13 Anchor 14 Bolt 21 Sandwich precast floor slab 22 Upper steel plate 23 Lower steel plate 24 Cylindrical nut 25 Bolt 26 Bolt

Claims (2)

(57) [Claims] 1. A conveying device comprising a support plate for supporting the precast slab from the upper surface and a jack having wheels running on a steel girder flange is inserted into a hole for a dowel opened in the precast slab, and the support plate is inserted. Attach to the precast slab from the upper surface of the precast slab, attach a pair of guide rollers so that the steel girder flange is sandwiched from both sides on the lower surface of the slab, activate the jack to position the wheel on the steel girder flange, A method for transporting a precast slab, wherein the slab is lifted from a steel girder flange, and a conveyor is run on the steel girder flange via wheels to transport the precast slab. 2. A jack which is inserted into a hole for a dowel of a precast slab to be conveyed and has a support plate on one side for supporting the precast slab from above and a wheel having wheels running on a steel girder flange. A transport device for precast floor slabs, comprising: