JP3333996B2 - End treatment tool for lining concrete and method of construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end treatment tool for lining concrete and a method for applying the same.

[0002]

2. Description of the Related Art When placing lining concrete inside a primary lining of a tunnel, a movable formwork is generally used as a formwork in the axial direction of the tunnel. Then, lining concrete is cast in a certain direction according to the length of the formwork. At this time, the edge of the lining concrete is generally treated by the following method. At the end of the formwork on the side where the lining concrete is not cast, a partition plate is attached to the end of the formwork. This will be the end frame. Generally, due to the problem of excavation accuracy, the distance between the primary lining and the formwork is not constant all around the tunnel. The gap between the partition plate and the primary lining, which is generated for this purpose, is filled with an iron plate or a sandbag. Also, if the primary lining is concrete lining,
Attach a rubber tube to the primary lining side end of the partition plate,
A method of filling the gap with the primary lining by expanding the rubber tube can also be used. The end of the existing lining concrete side is connected to the axial gap between the existing lining concrete and the formwork by a steel flange or the like attached to the formwork. The steel flange, etc. is pressed against the existing lining concrete with a jack or the like to make it adhere closely.

[0003]

SUMMARY OF THE INVENTION The above-mentioned conventional edge treatment device for lining concrete and the method of applying the same have the following problems. <A> At the end of the formwork on the side where the lining concrete is not cast, the gap between the primary lining and the formwork is filled with an iron plate or sandbags. Since iron plates and sandbags are heavy, these operations take time and effort. <B> At the end of the existing lining concrete side, a steel flange or the like attached to the formwork is pressed against the existing lining concrete with a jack or the like. For this reason, cracks may occur due to excessive pressing on the existing concrete.
In addition, the load due to buoyancy or the like during concrete casting may be concentrated on the existing lining concrete against which a steel flange or the like is pressed, causing cracking. <C> In some cases, the steel flange or the like may not completely adhere to the existing concrete simply by being pressed against the existing concrete. If the degree of adhesion is low, concrete leaks from the lap portion, and a step occurs at the joint. <2> When the primary lining is made of steel lining, the distance between the girder (main girder of the steel lining) in the circumferential direction of the steel lining and the formwork is not always constant. For this reason, even if a rubber tube having a circular cross section is attached to the end of the partition plate, the rubber tube and the girder may not contact each other. As a result, the poured concrete flows out of the formwork.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides an end treatment tool for lining concrete which can be easily installed and has good adhesiveness, and a method for applying the same. The purpose is to:

[0005]

In order to achieve the above object, an end treatment tool for lining concrete according to the present invention is provided in which a lining concrete is axially partitioned inside a primary lining of a tunnel. In the case of laying, lining concrete is installed at the end of the formwork in the axial direction of the tunnel. A hollow mat in which the inside of the upper and lower surfaces is connected by a plurality of wires of uniform length so that the inside is a flexible material with a cavity and the upper and lower surfaces are parallel when inflated by injecting gas or liquid. And a support member for supporting the hollow mat at a position protruding from the formwork. The construction method of the lining concrete is to arrange the formwork of the lining concrete in the axial direction of the tunnel at a predetermined position,
A partition plate projecting from the formwork toward the primary lining side is attached to an end of the formwork on the side where the lining concrete is not placed, and the hollow mat is stretched from the end of the formwork where the lining concrete is not placed. put out. Then, a gas or liquid is injected into the hollow mat, and the hollow mat is brought into contact with the inside of the primary lining before lining concrete, and the formwork, the partition plate, the hollow mat, and the primary lining are formed. It is characterized by placing concrete in the enclosed part. Further, the hollow mat is extended from the end of the formwork on the side of the existing lining concrete, and a gas or a liquid is injected into the hollow mat so that the hollow mat comes into contact with the existing lining concrete. And concrete laying in the area surrounded by the primary lining.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a lining concrete edge treatment device according to the present invention.

<A> End Treatment Tool The end treatment tool 1 includes a hollow mat 11 and a support member 14. The end treatment tools 1 are arranged at both ends of the mold 2 in the axial direction of the tunnel. The hollow mat 11 and the support member 14 will be described below.

<B> Hollow Mat The hollow mat 11 is a hollow mat made of a flexible material. The mat upper surface 11a and the mat lower surface 11b are connected by a plurality of wires of uniform length inside the mat. Therefore, when a gas or liquid is injected into the hollow mat 11 and expanded, the mat upper surface 11a and the mat lower surface 11b expand so as to be parallel. The width of the hollow mat 11 in the tunnel axial direction is, for example, wider than the interval between the main girders 41 in the circumferential direction of the steel lining tunnel. That is, the width between the main girders of the steel lining is made wider. The elasticity, deformation amount, and the like of the hollow mat 11 vary depending on the type of gas to be injected and the injection pressure.

<C> Supporting Material The supporting material 14 is formed by assembling two steel materials (horizontal member 14a, vertical member 14b) having a length approximately equal to the width of the hollow mat 11, for example, at right angles. If necessary, insert diagonal 14c
Reinforce with etc. FIG. 2 shows a cross-sectional view of the case where the end treatment tool 1 is attached to the end of the formwork 2 on the side where the lining concrete is not cast. The longitudinal member 14b is provided with, for example, a long hole 14d through which the adjustment bolt 15 to be attached to the mold 2 is passed (see FIG. 3). The support material 14 and the primary lining 4
Can be changed.

<2> Formwork The formwork 2 in the axial direction of the tunnel is made up of a face material in contact with concrete and a support material. Generally, it is manufactured by combining a steel plate and a steel material. The formwork 2 includes a telescopic mold for assembling and disassembling the end treatment tool every time concrete is cast, and a mold that can be integrally moved after concrete is cast. The formwork 2 is installed to support the lining concrete before hardening from the inside.

<E> Primary lining The primary lining 4 is shaped according to the cross-sectional shape of the tunnel.
The primary lining 4 includes steel lining, concrete lining, and shotcrete. The primary lining 4 is installed in order to prevent the surface of the tunnel excavation surface from falling or falling.

[0012]

[Embodiment 1] An embodiment of a method of applying lining concrete in the vicinity of an end of the formwork on the side where the lining concrete is not cast will be described below with reference to Figs.

<A> Installation of end treatment tool The formwork 2 is installed so that one end of the formwork 2 is located near the end of the existing lining concrete. A partition plate 16 is attached to the entire periphery of the end of the formwork 2 on the side where the lining concrete is not cast. The partition plate 16 serves to prevent the lining concrete before hardening from flowing out of the formwork. The support member 14 is attached to the partition plate 16. The partition plate 16 and the support member 14 are attached to the formwork 2 by adjusting bolts 15. The distance between the partition plate 16 and the support member 14 and the primary lining can be adjusted with the adjustment bolt 15. Generally, primary lining 4 and formwork 2
Is not constant around the tunnel. For this reason,
The distance between the primary lining 4 and the formwork 2 is adjusted with the adjusting bolt 15. The hollow mat 11 is attached to the support member 14. The hollow mat 11 has a length corresponding to the circumference of the mold. The hollow mat 11 can be divided and attached in terms of workability and the like. In this case, the joints are arranged so that no gaps are formed.

<B> Expansion of Hollow Mat and Casting of Concrete A gas or liquid is injected into the hollow mat 11 and expanded.
The hollow mat 11 expands by the length of the wire attached inside. If the width of the hollow mat 11 in the tunnel axial direction is wider than the width between the main girders of the steel lining, the hollow mat 11 is always irrespective of the distance between the end of the formwork 2 and the main girder 41 of the primary lining.
Adheres to the main girder 41. Concrete is poured by pouring concrete from the inside of the formwork 2. The concrete is filled in a portion surrounded by the formwork 2, the partition plate 16, the mat upper surface 11a, and the primary lining 4.

[0015]

[Embodiment 2] An embodiment of a method of constructing lining concrete near an end of an existing lining concrete side of a formwork will be described below with reference to FIG.

<A> Installation of end treatment tool The formwork 2 is installed so that one end of the formwork 2 comes near the end of the existing lining concrete. A support member 14 is attached to the end of the formwork 2 on the side of the existing lining concrete. Support material 14
Is attached to the formwork 2 with the adjusting bolt 15. The hollow mat 11 is attached to the support member 14. The hollow mat 11 has a length corresponding to the peripheral length of the mold 2. The hollow mat 11 can be divided and attached in terms of workability and the like. Between the hollow mat 11 and the formwork 2, a steel material 17 or the like is installed as needed. In this case, the steel material 17 and the like are used to smoothly fill the gap between the joint between the formwork 2 and the existing lining concrete 31. The position and pressing force of the steel material 17 can be adjusted with the adjustment bolt 18.

<B> Expansion of Hollow Mat and Casting of Concrete A gas or liquid is injected into the hollow mat 11 and expanded.
As a result, the existing lining concrete and the mat upper surface 11a of the hollow mat 11 come into close contact with each other. Concrete is poured by pouring concrete from the inside of the formwork 2. The concrete is filled in a portion surrounded by the formwork 2, the existing lining concrete 31, and the primary lining 4. The load such as buoyancy at the time of placing concrete is mainly transmitted to the existing lining concrete 31 through the hollow mat 11.

[0018]

The effects of the present invention are as described above, and the following effects can be obtained. <B> The hollow mat is expanded when the end treatment tool is installed.
For this reason, the adhesiveness with the primary lining or the existing lining concrete in contact with the hollow mat is good. As a result, the seam finish of the lining concrete is improved. <B> The hollow mat is lightweight, and swells to a predetermined thickness with a predetermined width. Therefore, it is easy to handle and has good workability. Further, even when the primary lining is a steel lining, the hollow mat can always contact the girders in the tunnel circumferential direction. <C> A hollow mat is pressed against the existing lining concrete. For this reason, there is no occurrence of cracks due to excessive pressing against the existing lining concrete or buoyancy during casting.

[Brief description of the drawings]

FIG. 1 is a perspective view of the vicinity of an upper portion of a tunnel when an end treatment tool of lining concrete of the present invention is viewed from a side where no lining concrete is placed.

FIG. 2 is a cross-sectional view of the vicinity of the end of the formwork on the side where the lining concrete is not cast.

FIG. 3 is a front view of the vicinity of the upper portion of the tunnel when the end treatment tool is viewed from the side where no lining concrete is placed.

FIG. 4 is a cross-sectional view of the vicinity of the end of the formwork on the existing lining concrete side.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shuichi Kaneda Taisei Construction Co., Ltd., 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo (72) Inventor Takeshi Tsuruya 209 Ogifu, Takaoka-shi, Toyama Saga Industry Co., Ltd. (72) Inventor Hirofumi Suzuki Examiner, Saga Industrial Co., Ltd., 209 Ogibu, Takaoka-shi, Toyama Toshiaki Nakamaki (56) References JP-A-6-129190 (JP, A) JP-A-2-96097 (JP, A) JP-A-59-173498 (JP, A) JP-A-11-11096 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/10

Claims (4)

(57) [Claims] 1. An end treatment tool to be installed at an end of a formwork of a lining concrete in an axial direction of a tunnel when the lining concrete is axially sectioned and placed inside a primary lining of a tunnel. The inside of the upper and lower surfaces is connected by a plurality of wires of uniform length so that the upper and lower surfaces become parallel when a gas or liquid is injected and expanded, and the inside is a hollow flexible material. An end of lining concrete, comprising: a hollow mat, a support member for supporting the hollow mat at a position protruding from the formwork, and a partition plate protruding toward the primary lining side from the formwork and contacting the hollow mat. Department processing tools. 2. A method according to claim 1, wherein said lining concrete is axially sectioned and placed inside the primary lining of the tunnel, wherein a formwork of the lining concrete in the axial direction of the tunnel is arranged at a predetermined position. A partition plate protruding from the frame toward the primary lining side is attached to the end of the formwork on the side where the lining concrete is not cast, and the hollow mat is extended from the end of the formwork where the lining concrete is not placed, and the hollow Inject a gas or liquid into the mat and make the hollow mat come into contact with the inside of the primary lining before placing the lining concrete, and the part surrounded by the formwork, the partition plate, the hollow mat, and the primary lining A method for constructing lining concrete, characterized by placing concrete in the lining. 3. An end treatment tool to be installed at an end of a formwork of a lining concrete in the axial direction of the tunnel, in a case where lining concrete is axially sectioned and placed inside a primary lining of a tunnel. The inside of the upper and lower surfaces is connected by a plurality of wires of uniform length so that the upper and lower surfaces become parallel when a gas or liquid is injected and expanded, and the inside is a hollow flexible material. And a support member for supporting the hollow mat at a position where the hollow mat projects from the formwork. 4. In the case where lining concrete is axially sectioned and placed inside a primary lining of a tunnel, a formwork of the lining concrete in a tunnel axial direction is arranged at a predetermined position, The hollow mat extends from the end of the existing lining concrete side of the frame, and gas or liquid is injected into the hollow mat so that the hollow mat comes into contact with the existing lining concrete. The existing lining concrete, the formwork, and the primary covering A method of constructing lining concrete, characterized by placing concrete in the area surrounded by the concrete.