JPS59141700A - Mold frame apparatus for linng tunnel - 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 The present invention relates to a formwork device for lining.

In the shield type excavation method, which is an example of a tunnel construction method, a primary downfall is generally performed using segments, and then a secondary lining is performed by pouring concrete around the surrounding surface of the tunnel.

The formwork device used for this secondary lining consists of a support member that supports the bottom of the tunnel parapet, and a supporting member that supports the bottom of the tunnel parapet, and a support member that supports the bottom of the tunnel parapet, and a A jack is provided to support the top and both sacrums,
It is constructed by setting a formwork around the girder paulownia, and the concrete IJ
-Formwork C-
Seikyo is fixed inside the ton.

However, in the above-mentioned conventional formwork iron 1 pongee construction, the tunnel parapet is supported only by the front and rear ends of the girder material, so when buoyancy acts on the formwork due to concrete pouring, the middle part of the girder material curves. There were 5 drawbacks: the formwork lifted up and the lining was not finished as expected. It may be possible to shorten the overall length of the formwork and prevent it from rising, but in this case the concrete vats would have to be poured many times and machining could not be carried out quickly.

The present invention aims to eliminate the drawbacks of the conventional 1R device as described above, and to provide a formwork device that can prevent the formwork material from rising and cast concrete to a predetermined lining thickness. purpose.

That is, in the formwork mounting 4% of the present invention, in the side part, an intermediate jack is further housed in the middle part of the girder member, and the support part fits closely into the opening provided in the formwork, and this intermediate jack is In the retracted position, the outer circumferential surface of the support part meets the outer circumferential surface of the formwork, and in the extended position, the support part protrudes from the opening of the formwork and supports the top of the tunnel peripheral wall. It is characterized by this.

The present invention will be described with reference to embodiments shown in the drawings.

As shown in Figures 1 to 4, this example is a formwork device used to excavate a tunnel using the shield excavation method, perform primary post-work using segment l, and then perform secondary extraction. Support members 4 and 5 supporting the bottom of the tunnel peripheral wall are provided at the front and rear ends of a pair of girders 3 extending longitudinally inside the tunnel 2, and both support members 4 and 5 support the bottom of the tunnel peripheral wall. A sled 6 and a roller 7 are provided on each of the sleds 6 and rollers 7, and the sled 6 and rollers 7 are provided so that the sled 6 and the roller 7 are moved inside the tunnel 2 by towing the supporting member 4 at the front end with a winch or the like.

A formwork 8 having a similar shape to that of the tunnel is arranged around the girder 3, and the formwork 8 is divided into a bottom bottom part and both side parts. As shown in FIG. 3, the top formwork 8a is fixed to the girder 3, one end of the valley of both surveying part formworks 8b and 8c is pivoted to both ends of the top formwork 8a, and one end of the valley of the side formwork 8b is One end of the bottom formwork 8d is pivotally attached to the other end, and the other ends of the other side formwork 8c and the bottom formwork 8d are free ends that can be held together. Between both surveying part forms 8b and 8c and the girder 3, bottom formwork 8d
Jacks 9 are provided between the and the girder material 3, and the operation of these jacks 9 causes both 9Il1 part formwork 8b, 8
cg and paper part formwork 9dlJ''--as shown in the third figure, it swings between an expanded position and an inwardly bent position.

At the front and rear ends of the beam member 3, there are provided front and rear first jacks 11.12 on which the rod 10 extends and contracts in the vertical direction, and front and rear second jacks 13.14 that extend and contract the rod 10 inward in the horizontal direction. , shoes 23 to 26 are provided at the rod ends of the respective jacks 11 to 14. The shoes 23 and 24 of the second jacks 11 and 13 press and support the top and both sides of the second circumferential wall of the primary Enoki tunnel during operation, and the shoes 23 and 24 of the second jack 11 and 13 press and support the top and both sides of the second circumferential wall of the primary Enoki tunnel, respectively. 2nd jack 12.14 shoe 25.2
6 is configured to press and support the top and both sides of the peripheral wall of the secondary tunnel 2'. 17 is a concrete injection port, 22 is a gable formwork, and 27 is a lap fitting.

This invention further includes an intermediate first jack 18 in which the rod 10 extends in the vertical direction in the intermediate portion of the beam member 3;
A second intermediate jack 19 that expands and contracts on both sides in the horizontal direction is housed. Intermediate beam 1. The shoes 15, 16 attached to the second jacks 18, 19 fit closely into the openings 21 in the formwork 8, and when each jack 18, 19 is in the retracted position, the outer circumferential surface of the shoes 15, 16 is As shown by the chain line in Figure 3, the intermediate beam 1. The second jack 18.19 extends and the shoe 15
．． 16 protrudes from the opening 21, and is adapted to press and support the top of the peripheral wall of the primary cover 2 and 1 hoof on each side, as shown by the solid line in FIG. Each of the above jacks 9,
11 to 14, 18, and 19 are operated by a power unit (not shown) or manually.

Next, the usage condition of the above-mentioned formwork device will be explained.

After moving the formwork equipment into the primary covering tunnel 2 to carry out the secondary ridge work, The second jacks 11 to 14 are actuated to fix the formwork 5 & 5 in the tunnel 2, and at the same time, the jack 9 is actuated to expand the formwork 8. Furthermore, intermediate beam 1
．． The second jack 18.19'4 operates to support the top and both sides of the second peripheral wall of the primary tunnel.

After the formwork device is fixed at the front and rear ends and the middle part, a lining material such as concrete 20 is inserted between the formwork 8 and the primary Enoki etunnel 2 peripheral wall (f, that is, segment 1) through the injection port 17. When the concrete 2o reaches a slightly upper part than the shoe 16 of the intermediate second jack 19, the shoe 16 is returned to the outer peripheral surface of the formwork 8 (No. 5.6).
(see figure). When the concrete 20 reaches the shoe 15 of the intermediate first jack 18, the shoe 15 is returned to the outer peripheral surface of the formwork 8, and the concrete 20 is spread over the entire area between the formwork 8 and the peripheral wall of the primary fallen tunnel 2. Finish pouring (see Figure 7).

In the process of laying down the concrete IJ-t 20, the formwork 4
Although buoyancy acts on the girder 8, since the intermediate first jack 18 provided on the girder 3 supports the top of the tunnel peripheral wall, the girder 3
This prevents the formwork 8 from being bent. Also, depending on the state of pouring the concrete 20, the concrete 20 may be spread evenly on both sides, whereas in the conventional type, the formwork 8 may deviate from side to side.
In this invention device, the intermediate second jack 19 provided on the beam member 3
supports both sides of the tunnel peripheral wall, so no wobbling occurs.

The device of this invention is not limited to the secondary construction of the sea scrap excavation method, but can be used for the primary tunnel construction or secondary lining construction of other tunnel construction methods.

This invention is as described above, and since an intermediate jack for supporting the top of the tunnel peripheral wall is provided in the middle part of the paulownia, the formwork will not be lifted up by the buoyancy of the concrete, and the lining can be lined with a predetermined thickness. In addition, since the formwork can be made relatively long, it is possible to carry out the molding process quickly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the embodiment of the present invention, Fig. 2 is a diagram taken along line B-] in Fig. 1, and Fig. 3 is a diagram taken along line R in Fig. FIG. 4 is a cross-sectional view taken from gland IV-IV in FIG. 1, and FIGS. 5 to 7 are schematic longitudinal side views showing the state of use. l...Segment 2...-Second memory tunnel 2'...Secondary tunnel 3...Girder material 4.
5... Support member 8... Form frame 11.12...
B1] Rear first jack 13.14...Front and rear second jack 15.16.23-26...Shoe 18...
・Intermediate 1st jack 19...Intermediate 2nd jack 2
0...Concrete 21...Opening 527 Figure 2

Claims (1)

[Claims] 1. At the front and rear ends of the girders disposed in the longitudinal direction of the tunnel, a supporting member that supports the paper part of the tunnel peripheral wall and a jack that supports the top and both 1111 parts of the tongue and four peripheral walls are provided, respectively. In a formwork device for tunnel construction in which a formwork is provided around the girder material, an intermediate jack is provided in the middle part of the girder material, and the support part fits tightly into the opening provided in the formwork. When in the retracted position, the outer periphery of the support part is connected to the outer peripheral surface of the formwork, and in the extended position, the support part protrudes from the opening of the formwork and supports the top of the tunnel peripheral wall. This is a formwork for tunnel construction, which is expected to be similar in shape.