JPS6219759Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a slide form used for secondary concrete lining in tunnel construction.

For secondary lining of tunnel construction, slide form is currently used in most construction locations. Among them, relatively small diameter cross section (diameter
For tunnels (about 2,000 to 3,000 mm), a telescopic slide form has often been used due to the work space and ease of construction. This telescopic slide form is
A long I-beam is used as a gantry beam for moving the formwork, and it is difficult to apply it to tunnel curves for the following reasons.

As shown in FIGS. 1 and 2, the conventional slide form gantry beam 2 has a straight shape with both ends protruding on both sides of the gantry body 1.
It was too close to one excavated surface (side surface) of the tunnel and too far away from the other excavated surface, resulting in reduced workability and difficulty in assembling and dismantling the slide form. Moreover, if the radius of curvature is extremely small, assembly and disassembly may become impossible.

In contrast to the conventional slide form in which the gantry beam did not have bendable parts as shown in Figs. By providing one or more bendable points 5, the above-mentioned drawbacks are solved.

In the embodiment shown in FIGS. 7, 8 and 9, a ratchet type turnbuckle 52 is used as a telescoping device for bending, one end of which is attached to the upper surface of the gantry beam 2 by a pin connection, and the other end is attached to the gantry body 1. It is attached to the fixed channel steel 53 by pin connection via a member. At this time, in order to make the gantry beam 2 easier to bend, the expansion and contraction device 52 is installed so that it does not coincide with the axis of the gantry beam 2.

When reaching the tunnel curve, the slide-form gantry beam 2 is bent from the state shown in FIG. 3 to the shape shown in FIG. 4 or 5. Details of the gantry beam 2 at this time are shown in FIGS. 7 and 8.

FIG. 7 shows the gantry beam 2 in a straight state before being bent. The front and back of the refraction point of the gantry beam 2 are connected by a ratchet type turnbuckle 52. The elevation of FIG. 7 is shown in FIG.
By rotating the ratchet type turnbuckle 52 and adjusting the length, the gantry beam 2 can be attached to the pin 5.
1 as an axis, it can be bent to the left and right of the tunnel axis. In the illustrated example, the position and length of the ratchet-type turnbuckle 52 allow for bending the tunnel by approximately 8 degrees with respect to the tunnel axis; It is also possible to bend it. Although FIG. 8 shows the gantry beam 2 bent to one side of the tunnel axis, it is of course possible to bend it to the other side.

According to the present invention, as described above, the gantry beam of the slide form can be adapted to the curved shape of the tunnel, so the accuracy of installing the formwork by the slide form is improved, and the installation and disassembly of the formwork by the slide form is improved. It can save time,
A practical effect is brought about in that the slide form facilitates installation and dismantling of the formwork.

[Brief explanation of the drawing]

1 and 2 are a plan view and an elevation view, respectively, schematically showing a conventional slide form in which the gantry beam is not bendable. Third
4 and 5 are plan views showing various states of the slide form of the present invention having a bendable gantry beam, and FIG. 3 shows the state before bending, and FIG. 5 shows the state when used in an arc-shaped curve, and FIG. 5 shows the state when it is bent into an S-shaped curve. FIG. 6 is a plan view comparing the state before and after bending at the curved portion of the tunnel, and the broken line indicates the state before bending. 7 and 8 are plan views showing the bent portion of the gantry beam, with FIG. 7 showing the state before bending, and FIG. 8 showing the state after bending. FIG. 9 is an elevational view of the folded portion. In the figure, 1 is a gantry main body, 2 is a gantry beam, 3 is a running wheel, 4 is a ground, 5 is a bending part, 51 is a pin, 52 is a ratchet type turnbuckle, and 53 is a channel steel.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a slide form used for secondary lining in tunnel construction, the steel material used for the steel girder for moving the formwork that constitutes the slide form can be bent at at least one point each in the front and rear parts. A slide form for tunnels characterized by being configured as follows. 2. The bendable part of the steel girder for moving the formwork of the slide form described above is connected at the front and back with an expansion and contraction device with both ends fixed, and can be bent by operating this to expand and contract. A slide form for a tunnel according to claim 1 of the utility model registration.