JPH07116829B2 - Mobile formwork method of viaduct slab - Google Patents

Description

TECHNICAL FIELD The present invention relates to a movable formwork method for a viaduct slab for railways, roads and the like.

[Conventional technology]

Since the construction of concrete viaducts is the construction of constructing structures of almost the same shape continuously, the construction method using the movable formwork is adopted in the formwork construction in order to save labor and efficiency of the work. It has started to be done.

There are two methods for moving the formwork: a crane-based suspension movement method and a traveling movement method.However, in the case of the suspension movement method, a large crane such as a gate crane has generally been used in the past. Not only will the scale be large, but a large dedicated site will be required to install and move the crane, and the cost will be enormous. Moreover, since it is extremely difficult to install a large crane in a mountainous area, it is impossible to use a mobile formwork.

In consideration of such a situation, the present inventor has endeavored to realize the formwork construction by the traveling movement method, and has made many proposals and practical applications so far. Then, as in Japanese Patent Application No. 61-25495, for example, the formwork to be installed between the bridge piers of the viaduct slab is formed by arranging small formwork devices formed in several widths in the width direction of the viaduct slab. , A construction method using a traveling movable formwork was completed, which is easy to move between piers in the transverse direction (horizontal movement) and easily from one pier after construction to the next pier (vertical movement).

[Problems to be solved by the invention]

In the invention of Japanese Patent Application No. 61-25495, a supporting girder is installed on the side of a row of piers in order to vertically move the formwork device, but in this case, if the height of the pier is high, there is a problem. However, if the height of the bridge pier is low, the erection position of the support girder will inevitably be low, and a sufficient space from the ground to the lower side of the support girder cannot be secured, making it difficult to carry in, carry out, and work with equipment. Will occur.

Also, since each formwork device is supported via wheels,
The wheels need to be able to withstand the heavy loads of cast concrete, making the equipment expensive. Further, since the formwork devices are independent of each other, the moving work has to be performed on each individual, and there are still problems to be improved.

The present invention has been made to solve the above-mentioned problems, and a relatively small crane used for erection of each formwork device is also used for removing and moving the formwork device after construction. By doing so, the support girders for vertically moving the formwork device are omitted, and the wheels are used only when the formwork device is moved, thereby reducing the wheel cost and each formwork device. It is intended to provide a formwork construction method capable of more efficiently performing the work of moving the formwork device by connecting the two.

[Means for solving problems]

The structure of the present invention will be described with reference to the drawings corresponding to the embodiments. According to the present invention, the piers 1 and 1 of the viaduct slab 2 are arranged in a row at a predetermined interval in the length direction of the viaduct slab 2, Formwork rails 4 and 4 along the width direction are erected, and on the other hand, a formwork device 5 is constructed in which the width of the viaduct slab 2 is divided into several parts, and the formwork traverse rail between the piers 1 and 1 is constructed. On 4, 4
A plurality of the formwork devices 5 are erected at predetermined positions via pedestals 11 and 11 and slab concrete is placed on the formwork bodies 8 and 10. After the concrete is hardened, the formwork devices 5 and 5 are formed. The formwork bodies 8 and 10 are dropped to separate from the concrete, and then
The formwork devices 5, 5 are integrally connected, and the connected formwork devices 5, 5 are supported by several wheels 7, 7 instead of the pedestals 11, 11 and connected. Move the formwork devices 5, 5 to the ends of the formwork traverse rails 4, 4, disconnect and separate the formwork devices 5 located at the ends, and lift them out of the pier with a crane or the like. It is a feature.

〔Example〕

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

In the figure, reference numerals 1, 1 ... Are bridge piers arranged in a row at substantially equal intervals in the length direction of the viaduct slab 2 to be constructed, and the viaduct slab 2 is constructed on these piers 1, 1. When viewed in cross section, this viaduct slab 2 generally has a shape in which a central part a on the pier 1 and parts b, b on both sides of the slab 2 projecting outward from the pier 1 are continuous. (See FIG. 1). The embodiment of the present invention will be described by taking the construction of such a viaduct slab 2 as an example.
The present invention can also be applied to the construction of a high-bridge slab that does not have the above-mentioned overhanging portions b and b.

Brackets 3, 3 are attached to the upper portions of the respective piers 1 on the side facing the adjacent piers, respectively, and the viaduct slab 2 is mounted on the brackets 3, 3.
Formwork traverse rails 4 and 4 formed long along the width direction of the
Erection. As means for constructing the rail 4, it is also possible to construct a support work from the ground and to lay the rail 4 on the rail 4, instead of using the brackets 3 as described above. When the height is low, it may be economically advantageous. Further, as shown in the figure, the I-shaped steel itself may be applied to the rail 4 for lateral movement of the formwork, or a separate rail may be laid on the I-shaped steel.

Reference numerals 5 and 5 denote traveling formwork devices mounted between the formwork lateral movement rails 4 and 4 that are installed to face each other, and are formed in the same manner, and both ends of a pedestal 6 having a rectangular cross section. Wheels 7, 7 that can travel by engaging with the formwork lateral movement rail 4 are detachably provided on the lower surface of the part, and the upper surface of the pedestal 6 has a formwork body 8 with a clap plate attached to the flap material. Has a structure in which it can be moved up and down by adjusting bolts 9 provided on the pedestal 6 so that it can be vertically moved, and the width of the device 5 is the width of the viaduct slab 2 divided into several parts.

The construction of the viaduct slab 2 is carried out using the traveling formwork devices 5, 5, ... .

First, the traveling formwork devices 5, 5, ... Are mounted on the opposing formwork lateral movement rails 4, 4 which are installed between the first construction piers 1, 1 to be constructed first, via the wheels 7, 7. It is mounted, traveled on rails 4 and 4 to a predetermined position, and arranged in parallel as shown in FIG. Then, as shown in FIG. 2, a jack (not shown) is interposed between the pedestal 6 and the rail 4, and the operation is performed to replace the wheels 7 and 7 with the pedestals 11 and 11 so that the device 5 is mounted on the rail 4. It is supported above, and the mold body is set at a predetermined height position by operating the adjusting bolts 9, 9. It is also possible to mount the formwork devices 5, 5 on the rails 4, 4 via the pedestal 11 at a predetermined position by a crane without using the wheels 7.
Further, the traveling formwork device 5 below the overhanging part b is provided with the overhanging formwork 10 along the lower surface of the overhanging part b.

Then, the reinforcing bars of the viaduct slab 2 are assembled on the form bodies 8, 8, 10 and 10 and concrete is poured. After the concrete has hardened, as shown in FIG.
9 is operated to separate and lower the formwork bodies 8 and 10 from the concrete, and the overhanging formwork 10 is removed. Then, as shown in FIG. 4, after connecting the respective formwork devices 5 and 5 integrally by the binders 12 and 12, a jack (not shown) is again interposed between the pedestal 6 and the rail 4. , Its operation makes the pedestal 11,
11 is removed and several wheels 7,
Each of the formwork devices 5 and 5 attached and connected to the wheels 7 and 7
It is supported on the rail 4 via.

Subsequently, the formwork devices 5, 5 connected as shown in FIG. 5 are pushed to position the formwork device 5 at the end of the formwork device 5 at the end of the rail 4. Therefore, while suspending the formwork device 5 at the end thereof on a crane (not shown), the binder 12 with the formwork device 5 adjacent thereto is removed and separated, as shown in FIG. It is hung from between the piers 1 and 1 by a crane (not shown). After this hoisting, if necessary, the mounting location of the wheel 7 is changed, and the formwork devices 5 and 5 that are connected again are pushed to position the end device 5 at the end of the rail 4. The same operation is repeated to finish the suspension of all the formwork devices.

The suspended formwork device will either be moved and erected between the next construction piers or will be removed.

〔The invention's effect〕

As explained above, according to the method of the present invention, the formwork used for the construction of the slab concrete between the piers is a small traveling formwork device, so it is easy to move or move by a crane and its work is safe. In addition to being efficient, a small-scale crane is sufficient, and the formwork device uses wheels only when moving, and supports the pedestal when placing concrete, so the wheels are Since it is sufficient to withstand the load when moving the frame device, simple,
It can be made inexpensive, and wheels and costs can be saved. In addition, each formwork device, after concrete construction,
Since they are connected together and moved on the rails and suspended from each end of the rails, the work movement of the formwork device can be done efficiently, and the number of wheels required for that movement is small. In addition, it has many excellent effects such as good wheel availability and cost savings.

[Brief description of drawings]

The drawings schematically show one embodiment of the method of the present invention. Fig. 1 is a front sectional view showing a state in which a formwork apparatus is loaded and arranged in parallel between piers, and Fig. 2 is a state in which a viaduct slab formwork is set. FIG. 3 is a front sectional view showing a state where the molds are peeled off and the respective formwork devices are connected, and FIG. 4 is a view where the connected formwork devices are supported by wheels instead of a pedestal. Front sectional view, FIG. 5 is a front sectional view showing a state where the connected formwork device is moved to the end of the rail, and FIG. 6 is a front sectional view showing that the formwork device at the end is suspended. . 1 ... Bridge pier, 2 ... Viaduct slab 4 ... Formwork lateral movement rail, 5 ... Formwork device 6 ... Frame, 7 ... Wheels 8, 10 ... Formwork, 11 ... Pedestal 12 ... Binding

Claims (1)

[Claims] 1. A form traverse rail along the width direction of the slab is installed on each pier arranged in a row at a predetermined interval in the length direction of the viaduct slab, while the number of widths of the slab is increased. A formwork device having a divided width is configured, and on the formwork lateral movement rail between the piers, a plurality of the formwork devices are erected at predetermined positions via a pedestal, and slab concrete is placed on the formwork body. After casting and hardening of the concrete, the formwork of the formwork device is lowered and peeled off from the concrete, and then each formwork device is integrally connected, and the connected formwork device is described above. Instead of the pedestal, it is supported through several wheels, and the connected formwork device is moved to the end of the formwork traverse rail,
A mobile formwork method for viaduct slabs, characterized in that the formwork units located at the ends are uncoupled and separated, and then suspended outside the pier by a crane or the like.