JPH057519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a movable formwork for secondary or tertiary lining of tunnels.

[Conventional technology]

Steel movable formwork is used to cast concrete for the secondary or tertiary lining of tunnels, and Figure 6 shows a formwork called a travel form, which has rails 1 on its bottom surface. The pedestal 2 rolls on this rail 1. Then, a curved frame 4 having approximately the same shape as the tunnel curvature is suspended from the left and right sides from the telescopic support 3 above the pedestal 2, and the frame 4 is suspended from the hinges.
A formwork face plate 5 is integrally stretched on the outer surface of the frame.

Then, the formwork is set by supporting the lower part of the frame 4 with the jack arms 6 from the pedestal 2.

On the other hand, in order to move, the jack arm 6 is retracted and the frames 4 are closed so as to be close to each other.
If the support column 3 is further shortened, the form face plate 5 will be separated from the concrete surface and a gap will be created between them, so the form face plate including the frame 2 will be moved forward along the rail 1.

In addition to this travel form, there are also formworks called centor form and needle beam (not shown), but all of them are suspended from a movable frame and supported by some kind of support means such as an arm. It has a structure that allows

[Problem that the invention seeks to solve]

In the conventional movable formwork, the frame supporting the formwork must be moved together, and the weight makes it difficult to move it manually. Furthermore, since the pedestal is located in the center and moves together with the pedestal, it cannot be used when cables are already installed in the tunnel, and cannot be used as a tertiary winding form.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
The movable part is lightweight, so it can be easily moved by hand, and it can be moved not only as a secondary winding form but also as a tertiary winding form while protecting the existing cable, and is easy to reset. The purpose of the present invention is to provide a movable formwork for lining.

[Means for solving problems]

In order to achieve the above object, the present invention includes pillars arranged in the tunnel width direction and erected at appropriate intervals in the tunnel length direction, and having rails on the top that extend in the tunnel length direction so as to be movable up and down; A top frame with a face plate provided between the columns lined up so as to be slidable by a roller that engages with the rail, a curved frame that is suspended from a hinge from a roller that also engages with the rail and is composed of a combination of split bodies, and an upper end. a flexible face plate in the shape of a blind that is fixed to the upper end of the curved frame and stretched along the outside of the curved frame; a jack arm that is interposed between the pillar and the curved frame; The gist of the invention is to consist of a flexible face plate winding device.

[Effect]

According to the present invention, in order to move the formwork, the jack arm between the curved frame and the support column is retracted, this is removed, the rail provided on the support column is lowered, and the tip split body of the curved frame is removed. Then, the frames are shortened, brought close to each other, and demolded. In this case, the tip of the flexible face plate can be pulled inward by winding the end of the curved frame with a winding device.

Then, the curved frame to which the top frame and the flexible face plate are attached is slid in the longitudinal direction of the tunnel by the action of rollers to move forward.

In addition, to set the advanced formwork, release the tension on the tip of the flexible face plate, attach the jack arm to support the curved frame in an expanded state, and connect the removed split body to the tip of the frame. Then, the rail is further raised to place the top frame, its face plate, the curved frame, and the flexible face plate in the set position.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing one embodiment of the movable formwork for tunnel lining according to the present invention, and shows the state when the formwork is set as a tertiary winding formwork.

Reference numeral 7 in the figure denotes a support column that stands in the tunnel, and consists of a jack base 7a, a main body 7b on the top that can be supplemented, and a threaded part 7c on the top.The jack base 7a is fixed to the bottom of the tunnel with an anchor, and the threaded part 7c The upper end of the shaft is engaged with a support mounting block 8 attached to the tunnel ceiling as a projection 7d. Further, the threaded portion 7c constitutes a threaded jack and is combined with the threaded ring 9. In the figure, reference numeral 9' denotes a screw ring provided on the jack base 7a to move the main body 7b up and down.

Two of the pillars 7 are lined up in the width direction in the tunnel, and are erected at appropriate intervals in the length direction of the tunnel.
The racks 10 for storing cables (electrical, telephone, etc. cables to be passed through the tunnel) are housed inside the framework, which provides so-called cable protection.

In the figure, reference numerals 12 and 12' denote C-shaped channel-shaped rails with openings on the sides, and a pair of left and right rails are mounted on an elevating ring 13 fitted to the support 7, with the support 7 sandwiched therebetween. This rail 12 extends in the length direction of the tunnel, and is installed between the lifting rings 13 of the support columns 1.
The side opening faces opposite to the column 7, and the threaded ring 9 engages directly below the lifting ring 13.

In the figure, 14 is a horizontal top frame with a face plate 14b among the formwork frames, and a roller 15 is provided at the left and right ends of the frame with mounting members 14a projecting downward, and the roller 15 is inserted into the rail through the opening. 1
It was able to roll within 2'.

In addition, 16 in the figure is a roller that is accommodated in the other rail 12 through an opening so that it can roll, and a divided body 18
The upper end of the curved frame 18 formed by the combination of a, 18b, and 18c is connected to the hinge by a pin 19.

In addition, a spacer 20 that can be inserted between the support member 17 and the mounting member 14a of the roller 15 of the top frame 14 is installed directly below the protrusion 7d at the upper end of the support column 7.
was installed. The spacer 20 is connected to the rail 1
Like 2 and 12', it is a long member arranged in the longitudinal direction of the tunnel.

In the figure, 21 is the face plate of the formwork, which is vertically sewn with a wire 21c between metal pipes 21a such as aluminum steel pipes with a spacer 21b made of hard rubber interposed in the shape of a drum in cross section. A flexible face plate in the form of a blind is fixed to the support member 17 at its upper end and is disposed on the outer surface of the curved frame 18. The material of the spacer 21b may be synthetic resin or metal. Furthermore, a release sheet 27 may be provided on the surface of the face plate 21 if necessary.

The central divided body 18b of the curved frame 18
and the main body 7b of the support 7.
can be detachably attached with bolts, pins, etc., and a support frame 23 is attached to the lower divided body 18c facing downward, and screw type jacks 24 can be interposed between the support frames 23 on the left and right sides. Make it. In the figure, 25 is a roller provided at the lower part of the main body 7b of the support 7, which supports the tip of the curved frame 18 during demolding, as will be described later.

In addition, the central divided body 18b of the curved frame 18
A winding device 26 using a winch is provided inside the wire 21 of the flexible face plate 21.
The tip of c can be rolled up.

Next, how to use it will be explained.

First, to explain the case of setting the formwork, as mentioned earlier, the supports 7 are erected,
A top frame 14 and a curved frame 18 are connected via rails 12, 12'.

If the threaded ring 9 is rotated and raised along the threaded portion 7c, the elevating ring 13 and the rails 12,1
2' rises, and the top frame 14 and curved frame 18 also rise. Then, the spacer 20 is fitted between the support member 17 and the mounting member 14a, and the top frame 14 and the curved frame 18 are integrated.

Moreover, the curved frame 18 has divided bodies 18a, 18
b, 18c are combined, and the lower end is the support frame 2
3 makes contact with the bottom of the tunnel, and the support frames 23 are fixed with jacks 24. Further, a jack arm 22 is attached between the divided body 18b of the curved frame 18 and the main body 7b of the support column 7 with a pin or bolt to support the entire curved frame 18.

This jack arm 22 can be used to form a sidewalk by placing a board on it.

A blind-shaped flexible face plate 21 and a release sheet 27 are stretched as needed on the outside of the curved frame 18, and since the top frame 14 has a face plate 14b, concrete cannot be poured on the outside thereof. I can do it.

On the other hand, in order to demold the formwork, as shown in FIG. The tip of the wire 21c is attached to the winding device 26 attached to the wire 18b.

When the threaded ring 9 is rotated in the opposite direction and lowered along the threaded portion 7c, the elevating ring 13 and the rails 12, 12' are also lowered, and the top frame 14 and the rails 12, 12' are lowered. The curved frame 18 is also lowered, and the face piece 14b and the flexible face plate 21 are separated from the surface of the covered concrete B.

If the jack arm 22 is gradually retracted as the curved frame 18 descends, the curved frame 18
The lower end approaches the support 7 side, and at the same time the winding device 26
When the tip of the wire 21c is wound up, the tip of the flexible face plate 21 is pulled into the inside of the curved frame 18 via the adapter 28.

Then, the face plate 21 of the adapter 28 portion
The middle part of the curved frame 18 comes into contact with the roller 25.
stops descending. And Jyatsuki arm 22
to be removed. After doing so, the top frame 14 is advanced along the rail 12' by the rollers 15, and the curved frame 18 is moved along the flexible face plate 12'.
1 with the roller 16 still attached to the rail 12.
can be advanced along.

To set the formwork again after moving forward by the required length, loosen the winding device, attach the jacking arm 22 and gradually extend it, and then tighten the rails 12, 1.
2' is raised to raise the top end frame 14 and the curved frame 18, and the curved frame 18 is assumed to have the divided body 18c attached thereto.

〔Effect of the invention〕

As mentioned above, in the movable formwork for tunnel lining of the present invention, only the top frame and curved frame to which the face plate is attached are moved, so it is not necessary to move all the formwork frame supporting frames as in the conventional case. There are no moving parts, and it can be easily done by hand.

Furthermore, since the formwork can be advanced without moving the trestle or support, even if cables are installed in the tunnel, the formwork can be transferred while protecting the cables. As a result, it can be used not only as a formwork for secondary lining of tunnels but also for tertiary lining.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the movable formwork for tunnel lining of the present invention when set, Fig. 2 is a partial front view of the flexible face plate, and Fig. 3 is a portion of the elevating mechanism of the formwork. 4 is a side view with some parts omitted from the same as above.
FIG. 5 is a front view of the model and its movement, and FIG. 6 is a front view of a conventional example. 1... Rail, 2... Frame, 3... Telescopic support,
4... Curved frame, 5... Formwork face plate, 6... Jacket arm, 7... Pillar, 7a... Jacket base, 7b... Main body, 7c... Threaded part, 7d...
Protrusion, 8... Prop mounting block, 9, 9'... Screw ring, 10... Cable storage rack, 1
1, 11', 11''...Horizontal member, 12, 12'...Rail, 13...Elevating ring, 14...Top frame, 14a...Mounting member, 14b...Front plate, 1
5, 16...Roller, 17...Supporting member, 18...
...Curved frame, 18a, 18b, 18c...Divided body, 19...Pin, 20...Spacer, 21...
...Flexible face plate, 21a...Metal pipe, 21b...
... Spacer, 21c ... Wire, 22 ... Jacket arm, 23 ... Support frame, 24 ... Screw type jack, 25 ... Roller, 26 ... Winding device, 2
7... Release sheet, 28... Adapter.

Claims (1)

[Claims] 1. Supports lined up in the tunnel width direction and erected at appropriate intervals in the tunnel length direction, and having rails on the top that extend in the tunnel length direction so as to be movable up and down;
A top frame with a face plate is provided between columns arranged in the width direction so as to be slidable by a roller that engages with the rail, and a curved frame that is suspended from a hinge from a roller that also engages with the rail and is made up of a combination of split bodies. , a blind-shaped flexible face plate whose upper end is locked to the upper end of the curved frame and stretched along the outside of the curved frame; a support column; a jack arm interposed between the curved frame; A movable formwork for tunnel lining, characterized by comprising a winding device for a blind-shaped flexible face plate.