JPH09268898A - Method and device for replacement of crown of tunnel supporting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely replace the crown without preventing the danger of dropping in execution of supporting members by the expansion method. SOLUTION: A supporting member 10 is assembled in a ring shape without connecting crown parts to each other along the inner circumference of an excavated tunnel. A space between end parts 10e, 10e of the supporting member whose crown part is not connected is widened by a widening device to closely attach the supporting member 10 to the ground E. The space between the end parts 10e, 10e of the supporting member is replaced by a replacement member 7 provided with an extension part 17 extending to a back side of the end part 10e of the supporting member on each end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a support material in a ring shape along the inner periphery of an excavated tunnel without connecting the top ends thereof, and connecting the unsupported support material ends of the top ends. The present invention relates to a method and an apparatus for refilling a top end of a tunnel support material in which a support material is closely adhered to the ground by widening with a widening device, and the support material is refilled between the end portions of the support material to form a support work.

[0002]

2. Description of the Related Art Conventionally, as a supporting method for supporting an inner peripheral surface of an excavated tunnel, a supporting material is assembled in a closed ring shape and a backing is performed between the back surface and the ground. It is assembled by an expansion method, etc., in which the end portions are assembled in a ring shape that is not connected, the width between the ends is widened with a jack, etc., and the ground is closely attached.

[0003] However, in the latter expansion method, it is difficult to perform the work of replacing the top end gap with a square pipe or other metal fittings after the jack is widened, and the square pipe or other metal fittings are difficult to perform. There is a risk of free fall.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a tunnel support for performing a refilling operation between the support material ends at the top end in a construction work using an expansion method, in which the danger of falling is prevented and a safe construction is performed. An object of the present invention is to provide a method and an apparatus for changing the top of wood.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for refilling a top of a tunnel supporting material, which comprises assembling the supporting material in a ring shape along the inner periphery of an excavated tunnel without connecting the top. The top of the tunnel supporting material is formed by widening the end of the supporting material that is not connected with the part by a widening device so that the supporting material is in close contact with the ground, and the end between the ends is replaced by a refilling member to form a support. In the refilling method, a projecting portion extending to the back of the end of the support material is provided at both ends of the refilling member, and the refilling member changes the width of the widening device in which the width between the end portions of the support material is widened.

[0006] In addition, the top end refilling device of the tunnel support material according to the present invention, assembles the support material along the inner periphery of the excavated tunnel into a ring shape without connecting the top end, and connects the top end. In the top end refilling device of the tunnel support material, the end between the end portions of the support material is widened by a widening device so that the support material is brought into close contact with the ground, and the end portion is refilled with a refilling member to form a support. At both ends of the refilling member, projecting portions extending to the back of the end of the support material are provided.

Therefore, according to the present invention, since the refilling member is locked to the back surface of the end of the support material by the projections provided at both ends thereof, there is no danger of falling, and the support can be carried out safely and efficiently. Can be constructed.

In carrying out the present invention, it is preferable that the refilling member is inserted into the top end from the face side.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, a refilling member indicated by reference numeral 7 is inserted between ends 10 e and 10 e of support members 10 and 10 assembled along the inner periphery N of the excavated tunnel. As shown in FIG. 3, an inverted L-shaped member is fixed to both ends of the square pipe 18 by welding, for example, and a vertical portion thereof is a supporting material end 10 as shown in FIG.
e abuts, and the horizontal portion extends to the ground-side back surface of the support material 10 to form an overhang portion 17. A lath net is provided between the overhang portions 17.

FIG. 4 shows a changing member 7 of the second embodiment.
A is shown. The refilling member 7A has an H-shaped steel material 20 fixed to both ends of the square pipe 18, and an overhang member 17A provided separately from the steel material 20.

FIG. 5 shows a refilling member 7B of the third embodiment.
A plate member longer than the square pipe 18 is fixed to the upper side of the square pipe 18 to form an overhang portion 17B, and a lath net 19A is further provided thereon.

FIGS. 6 and 7 show a refilling member 7C according to a fourth embodiment. Both ends of a character-shaped steel material are deleted leaving the upper side (K portion shown), and an overhang portion 17C is formed. Is formed.

Since the lath nets 19 and 19A are provided when necessary for preventing falling objects and lining, they need not be provided.

FIG. 19 shows a supporting material 10 used in the present invention.
An example is shown. The main girders 1 and 1 which are curved along the inner circumferential surface N of the tunnel and divided in the circumferential direction are connected at both ends in the longitudinal direction of the tunnel by joint plates 2 and at the center by auxiliary plates 3 to form a frame body. It is formed and has a lath net 4 structure on the curved outer peripheral surface of the frame. FIG. 20 shows a supporting material 10A in which the embedded concrete 6 is cast into the supporting material frame of FIG. 19 to increase rigidity.

[0015] Next, a method of rearranging according to the present invention will be described. First, as shown in FIGS. 8 and 9, the support material 10 is assembled in a ring shape along the inner periphery N of the excavated tunnel by bolts F or welding, leaving a top end U.
Note that the support member 10 is not divided as shown in the figure, but may be an integral member. Next, as shown in FIG. 10, the width between the ends 10 e and 10 e of the support material assembled as shown in FIG. Then, the widened interval is replaced by the refilling member 7 and used as support.

FIGS. 11 to 17 show how the jack T and the changeover member are mounted. FIG. 11 shows a state in which the refilling member 7 is inserted between the support members 10 and 10, and FIG. 13 is shown, and FIG. 13 shows an example in which a refilling member 7X is inserted on both sides of one jack T.

The example shown in FIGS. 14 and 15 is an example in which the jack D is attached by using the hole D on the side surface of the supporting member 10, and in FIGS. An example in which a jack mounting seat Z is provided on the side is shown.

The refilling member 7 to the top end U of the support member 10 is inserted from the face H as shown in FIG.

FIG. 21 to FIG. 23 show other modes of the rearrangement. In FIG. 21, the height dimension h of the refilling member 7 is set to be smaller than the thickness dimension H of the ring-shaped support member 10, and the position where the jack T <b> 1 is interposed is determined by the refilling member 7. 18 is also set at a lower position, when the refilling member is inserted from the face side shown in FIG. 18, interference between the jack T1 and the refilling member 7 is prevented.

Here, it is not necessary to dispose one jack T1 and one refill member 7. As shown in FIG. 22, two jacks T2 and one refilling member 7 may be used, or as shown in FIG. 23, two refilling members 7, 7 and one jack T3. May be used.

[0021]

As described above, according to the present invention,
In the shoring work by the expansion method, the refilling work between the support material ends at the top end can be performed safely and efficiently while preventing the risk of falling.

[Brief description of drawings]

FIG. 1 is a side view showing an assembled state of a refilling device according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is a perspective view of the rearrangement device shown in FIG. 1;

FIG. 4 is a perspective view showing a refilling device according to a second embodiment.

FIG. 5 is a perspective view showing a refilling device according to a third embodiment.

FIG. 6 is a perspective view showing a refilling device according to a fourth embodiment.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a cross-sectional view showing a support material erection step.

FIG. 9 is a cross-sectional view showing an assembling step of the support material.

FIG. 10 is a cross-sectional view showing a widening / rearrangement step.

FIG. 11 is a side view showing a changing part.

FIG. 12 is a bottom view showing a mounted state of a changeover member and a jack.

FIG. 13 is a bottom view showing another mounting state of the changeover member and the jack.

FIG. 14 is a side view showing another mounting state of the jack.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a side view showing still another mounting state of the jack.

FIG. 17 is a bottom view of FIG. 16;

FIG. 18 is an explanatory diagram of a method of inserting a changing member.

FIG. 19 is a perspective view showing an example of a support material used in the present invention.

FIG. 20 is a perspective view showing another example of the support material used in the present invention.

FIG. 21 is a side view showing another mode of changing the arrangement.

FIG. 22 is a view showing another aspect of the changing of the arrangement, as viewed from below the top end.

FIG. 23 is a diagram showing still another mode of refilling;
The figure seen from the lower part of the top end.

[Explanation of symbols]

 10, 10A: support material 10e: end portion of support material 7, 7A, 7B, 7C, 7X: refilling member 17, 17A, 17B, 17C: overhang portion 18: square pipe 19, 19A: Lath net 20: H-shaped steel material E: Ground mountain T: Jack

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroaki Suzuki 1 Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo Sumitomo Osaka Cement Co., Ltd. (72) Inventor Kaname Aoyama 1-8 Kandanishiki-cho, Chiyoda-ku, Tokyo Sumitomo Osaka Cement Co., Ltd. Tokyo Branch

Claims (2)

[Claims] 1. A support material is assembled along the inner periphery of an excavated tunnel into a ring shape without connecting the top ends thereof, and the width of the unsupported support material ends of the top ends is widened by a widening device. In a method for refilling a top end of a tunnel support material in which a support material is brought into close contact with a ground and a refilling member is provided between the end portions of the support material to form a support, the support material ends are provided at both ends of the refilling member. A method of refilling a top end of a tunnel supporting material, comprising: providing a projecting portion extending to a back surface of the supporting member; 2. The supporting material is assembled along the inner periphery of the excavated tunnel into a ring shape without connecting the top ends thereof, and the width of the unsupported supporting material ends of the top ends is widened by a widening device. In a top end refilling device for a tunnel support material, in which a support material is brought into close contact with a ground and a support member is formed by refilling between the support material ends, a support material end is provided at both ends of the refill member. A top end refilling device for a tunnel supporting material, wherein an overhanging portion is provided extending to a back surface of the portion.