JPS61270407A - Apparatus for moving high bridge slab mold frame centle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is suitable for a formwork center moving device used for constructing a slab in a concrete viaduct, and is particularly suitable for an overhanging part of a slab that is constructed while allowing vehicles to pass underneath. The invention relates to a device that

"Prior art, problems to be solved by the invention" Generally,
In many cases, elevated bridges for railways and roads are constructed along conventional routes, and when pouring concrete into the slab, the formwork is placed at the construction limit that allows trains and other vehicles to pass, that is, at the top of the piers. Must be installed safely.

Conventionally, a movable stage was installed between the upper parts of the left and right piers, and an intermediate formwork center was installed on top of the movable stage on which the formwork could be raised and lowered, and brackets were installed on the outer surface of the piers. Attach the overhang formwork center on top of it.

A slab formwork center moving device is known in which, after construction of one section, the intermediate center is moved to the next section using a moving cart, and the overhang center is moved using a separately installed crane or the like.

However, in such a device, each time the overhang center is moved, it must be removed from the bracket, moved using a crane, and reassembled, which is complicated and requires a great deal of time and effort, as well as reducing the safety of conventional routes. I was worried about securing it.

For this reason, conventionally, there is a known device that links the intermediate center and the overhang center and automatically moves both at the same time. To avoid this, the overhang center is supported by telescopic support arms installed at the front and rear of both sides of the intermediate center, and the one support arm that should be allowed to pass before colliding with the pier is retracted inward. It is configured so that it is supported by the other support arm, and is extended again after passing to support the overhang center, and the other arm is extended to allow it to pass, resulting in a movement operation and support therefor. The problem was that the mechanism was complicated.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention makes it possible to move the overhang part center independently without cooperating with the intermediate part center, and moreover, the overhang part center can be moved alternately. This device is composed of two members, a formwork support and a feed garter, and when one of these is moved, it is supported by the other so that it can be moved safely and reliably with simple operation. This is a proposal.

An example in which the present invention is applied to an overhanging portion of a viaduct slab shown in the drawings will be explained below. In Figs. 1 and 3, a bridge pier 1 constructed in advance parallel to a conventional route is designed to prevent the passage of vehicles below. Brackets 2 are attached to the upper part that does not obstruct the structure, and an overhang center 5 consisting of a feed garter 3 and a formwork support 4 is installed on each bracket 2 attached to a plurality of adjacent piers 1.

The bracket 2 consists of a vertical fixed frame 6, a support beam 7 horizontally protruding from its upper end, and a rod 8 for reinforcing the support and fixation of the support beam to the fixed frame 6. The frame 6 is brought into contact with the outer surface of the pier 1, and the fastening member 9, which is brought into contact with the inner surface of the pier 1 corresponding to its upper end, and the upper and lower ends of the fixed frame 6 are connected by horizontal tie rods 10 and diagonal tie rods 10'. By tightening this, it is detachably fixed so as to enclose the pier 1.

The lower end of the feed garter 3 is removably supported and fixed on each bracket 2 by bolts, etc., and a pair of left and right lower rails 11 are continuously fixed to the upper end in the pier span direction. A continuous lower rail 1 is attached to the inward hook-shaped horizontal part 13 at the upper end of the suspended part 12.
1 and a pair of left and right upper rails 11' facing each other vertically at a predetermined interval are continuously fixed.

The formwork support 4 has a formwork 14 fixed to its upper end, and support legs 15 hanging on the left and right sides of the feed garter 3 on both sides of the lower part.
is provided, and a lifting jack 16 is fixed to the lower end thereof,
By removably fixing the lower end of this lifting jack 16 to the bracket 2 with a bolt or the like, each bracket 2
It is supported and fixed on the upper part, and there is a trolley part 1 in the lower middle part.
7 is provided, and wheels 18 are rotatably supported on the left and right sides thereof.
is adapted to be located between the upper and lower rails 11.11' of the feed garter 3.

In Figures 4 and 5, the formwork support 4 has its -
A pair of upper and lower sheaves 19 are provided at the front and rear portions of the side surfaces, and a winch 20 is provided between the front and rear upper sheaves 19, 19, and each of the winches 20 has both ends connected to a longitudinally intermediate portion of the feed garter 3. The middle part of the wire rope 21 stretched in a circular manner is wound through the front and rear sheaves 19, and when the winch 20 is rotated in either forward or reverse direction, the wire rope 21 stretched in the front and rear ends.
One side is pulled in the winding direction and the other side is fed out.

"Operation of the Invention" The operating state of the present invention having the above configuration is shown in FIGS. 2 to 6.
To explain with a diagram, when pouring concrete on-site at the overhanging portion of the slab 19, the feed garter 3 and the formwork support 4 are fixed on each bracket 2, and the lifting jack 16 is moved by the wheels 18 onto the upper rail 11. When the formwork 14 is raised until it comes into contact with the concrete, the formwork 14 is accurately positioned at the pouring position, and in this state concrete is poured to complete the construction of one section.

Next, when the next section is to be constructed in succession after the poured concrete has hardened, the feed garter 3 is first separated from the bracket 2 with the lifting jack 16 jacked up, and the winch 20 is rotated. By circulating the wire rope 21 clockwise in the figure, the feed garter 3 moves forward while being suspended on the wheels 18 via the upper rail 11, and its tip reaches the front bracket 2. When each bracket stops moving 2,
Fixed to. Next, the lifting jack 16 is separated from the bracket 2 and then jacked down, and with the wheels 18 placed on the lower rail 11' and the formwork support 4 completely floating above the bracket 2, the winch 20 is moved in the opposite direction. By rotating the wire rope 21 in the counterclockwise direction in the figure, the formwork shoring 4 moves forward on the lower rail 11, and its tip is supported by the tip of the feed garter 3. When it reaches the bracket 2 in front of the bracket 2 that is currently in use, the movement is stopped, the lower end of the jack 16 is fixed to each bracket 2, and the form support 4 is raised in the same manner as described above, and the next section of concrete is poured. I do.

In this way, construction of the overhang portion is continued for each section while sequentially moving the feed garter 3 and the formwork support 4 forward alternately while supporting each other.

"Effects of the Invention" As described above, according to the present invention, a bracket is detachably attached to a bridge pier, and a bracket is detachably attached to the brackets attached to a plurality of adjacent bridge piers, and the brackets are attached at predetermined intervals vertically on both sides. A feed garter is formed by fixing an upper rail and a lower rail facing each other in the span direction, and a lifting jack whose lower end can be removably attached to the bracket is fixed to one side, and the feed garter is attached to the middle part. a formwork support provided with a trolley portion supporting running wheels located between the upper and lower rails; and a drive device for alternately moving and traveling the feed garter and the formwork support along the upper and lower rails. Since it is composed of , it is possible to easily attach and detach the feed garter and formwork support to the bracket, raise and lower the jacks, and move the feed garter and formwork support. The formwork center can be moved safely, smoothly and quickly along the continuous upper and lower rails while being supported reliably.

[Brief explanation of the drawing]

Figure 1 is a front view showing the state when slab concrete is placed, Figure 2 is a front view of the main part of the center showing the state when slab concrete is being placed, and Figure 3 is the state when the formwork support is being moved. FIG. 4 is a front view, FIG. 4 is a side view of the center, FIG. 5 is a plan view thereof, and FIGS. 6(a) and 6(b) are schematic plan views showing a state in which the formwork support and the feed garter are being sent out. 1... Pier 22... Bracket, 3... Feeding garter,
4. Formwork support, 5. Formwork center, 11'...
Lower rail, 11.. Upper rail, 16.. Lifting jack, 17.. Dolly section, 18.. Wheels, 20.. Winch.

Claims (1)

[Claims] A bracket is detachably attached to a pier, and an upper rail and a lower rail are detachably attached to the brackets attached to a plurality of adjacent pier piers, and upper and lower rails are vertically opposed to each other at a predetermined interval on both sides in the span direction. A trolley having a fixed feed garter, fixed lifting jacks whose lower ends can be detachably attached to the brackets on both sides, and supporting running wheels located between the upper and lower rails of the feed garter in the middle part. A moving device for a viaduct slab formwork center, comprising a formwork support provided with a section, and a drive device that alternately moves the feed garter and formwork support along the upper and lower rails. .