JPH0696958B2 - Construction method and mold form of seal lining in non-segment shield construction method - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" A tunnel is constructed by excavating a pit in the ground using a shield machine, and lining with a concrete lining without using a segment in the excavated pit. The present invention relates to a method of constructing a seal lining in a non-segment shield construction method and its formwork.

"Prior Art" Previously, the present applicant provided a method for connecting an inner mold and an outer mold in the non-segment shield construction method and its structure (Japanese Patent Application No. 61-60128) shown in FIG.

Here, a brief description will be given with reference to FIG. In the figure, reference numeral 1 is an inner formwork used in the non-segment shield construction method. A cone 2 is provided by fixing the bottom portion to the outer peripheral surface of the inner formwork 1, and a cone is formed between the cone 2 and the inner formwork 1. A through hole is formed along the axis of 2 and the spacer 5 having the nut 3 on the inner peripheral surface of the outer form 4 is arranged so that the screw hole of the nut 3 is located on the axis of the through hole of the cone 2. The inner mold 1 is fixed, and a connecting member 6 is attached from the inner peripheral surface of the inner mold 1 to the screw hole of the nut 3 provided in the spacer 5 via the cone 2 so as to attach the connecting member 6 to the inner mold 1. When integrating the outer mold 4 with the outer mold 4, the cone 5 fixed to the outer peripheral surface of the inner mold 1 is brought into contact with the spacer 5 fixed to the inner peripheral surface of the outer mold 4, and The inner formwork 1 and the spacer 5 are connected from the inner peripheral surface side by the connecting member 6 via the cone 2, , After Da設 concrete lining solidified in the mold, when or separated inner mold 1 from the outer mold 4, inner mold the coupling member 6 is removed 1
By removing the, to form a cone-shaped space on the inner peripheral surface side of the solidified concrete lining,
The space is filled with grout.

"Problems to be Solved by the Invention" However, in the method for connecting the inner mold and the outer mold in the non-segment shield construction method and the structure thereof,
When forming the formwork in an annular shape to construct the seal lining along the wall of the mine, fix the inner formwork to the base end of the supporting material fixed to the inner peripheral surface of the outer formwork, After the formwork and the inner formwork are integrated, the concrete is assembled into an annular shape that can be poured. However, there is a need for improvement in the following points.

(I) The workability of the outer formwork is limited because the work is connected from the handhole of the inner formwork, etc., and this should be improved.

(Ii) It is inevitable that the outer formwork is a butt structure in which the outer formwork is not tightly connected to each other, and a special waterproofing material for the connecting portion is required. Therefore, it is necessary to improve this to enable the outer molds to be tightly connected to each other, improve the water blocking property without using a special water blocking material, and reduce the cost of the water blocking material.

(Iii) Since the inner formwork is assembled mainly in the state of the composite formwork, there is a limit to the assembling accuracy of the outer formwork, and in particular, the assembling accuracy of the formwork located on the ceiling part should be improved.

(Iv) To further reduce the manufacturing cost such as the processing cost of the outer mold to be buried.

The present invention has been made in view of the above-mentioned problems, and improves the efficiency of the work of assembling the molds by facilitating the work of connecting the outer molds, and at the same time, improves the accuracy of assembling the molds. In addition to improving the water blocking performance by making it possible to tightly connect the outer molds to each other, no special water blocking material is required, and as a result, the cost of the water blocking material is reduced, and the manufacturing cost of the outer mold is reduced. It is an object of the present invention to provide a method of constructing a seal lining in a non-segment shield construction method and a formwork thereof that can realize the cost reduction of the above.

"Means for Solving Problems" In order to solve the above problems, the method of the present invention is to first assemble the outer formwork along the wall surface of the mine, and then install a support member inside the outer formwork. It is characterized by assembling the inner formwork through, then placing concrete between them,
Further, the device of the present invention is arranged to form an arc-shaped outer mold made of a plate material, an inner mold for the outer mold, and a space for placing concrete on the inner peripheral surface side of the outer mold. The present invention is characterized in that it comprises a support material and an inner formwork detachably attached to the base end portion of the support material via a connecting member.

[Examples] Hereinafter, the present invention will be described with reference to the drawings. 1 to 7 show an embodiment of the present invention, and FIG. 1 is a diagram for explaining the outline of the non-segment shield construction method.

First, the components in FIG. 1 will be described. Reference numeral E is the ground near the tunnel construction, 11 is a shield machine for excavating the ground E, 12 is a jack for propulsion, and H is for excavation by a shield machine. Wall surface of the mine, 13 and 14 are an inner formwork (hereinafter abbreviated as "inner frame") and an outer formwork (hereinafter abbreviated as "outer frame") assembled in an annular shape, and 15 is connected in the tunnel excavation direction. A gable frame fixed to the connection portion of the inner frames 13, 13 for each concrete placing section, 16 is a concrete placing machine, 17 is an erector for assembling the formwork, and 18 is an erector for disassembling the formwork. Reference numeral a is a concrete pouring section, b is an unconsolidated concrete section, c is a consolidated concrete section, d is a formwork dismantling section, R is seal lining, and G is backfill grout.

Next, referring to FIG. 2 to FIG.
A mold for seal-lining in the segment shield method (hereinafter, simply referred to as "form") will be described.

2 is a front view of the mold in which the inner frame 13 and the outer frame 14 are integrated, FIG. 3 is a side view thereof, and FIG. 4 is IV-I of FIG.
It is a V sectional view. In these figures, the inner frame 13 and the outer frame 1
4 is divided into a predetermined size in the circumferential direction and in the tunnel excavation direction so that it can be assembled in an annular shape along the wall surface H of the excavated mine. The outer frame 14 is composed of a skin plate 14a formed by a plate material in an arc shape, and a flanged portion 14b formed by fixing the plate material to the inner peripheral surface side while forming the plate material in a strip shape along the peripheral edge portion. . Then, on the inner peripheral surface side of the outer frame 14, a supporting member 20 having the inner frame 13 fixed to the base end is disposed, and the supporting member 20 has substantially the same curvature as the skin plate 14a of the outer frame 14. Formed and skin plate 14
A ring plate 20a is provided on the inner peripheral surface side of a so as to be spaced apart in parallel with the tunneling direction, and the ring plates 20a, 2
A gate-shaped spacer in which a plurality of (three in the present embodiment) are arranged at a predetermined interval so as to be orthogonal to 0a and the legs extend toward the center of the tunnel. It consists of a plate 20b. The ring plate 20a has air holes 20c, 20c, at predetermined intervals along the circumferential direction.
... and spacer plate
The air holes 20d and 20d are provided at a predetermined interval in the tunnel advancing direction in 20b.
d, ... are formed. Further, a nut 20e is fixed to the upper portion at the base end portion of the spacer plate 20b, and the inner frame 13 is provided on the back side thereof via a cone-shaped connecting member 21.
Is fixed.

The inner frame 13 is formed by a skin plate 13a having a curvature set so as to be parallel to the skin plate 14a of the outer frame 14 and a strip-shaped plate member fixed to the inner peripheral surface side along the peripheral edge of the skin plate 13a. And a flange portion 13b to be formed. Then, on the outer peripheral surface of the skin plate 13a, the same number of cone-shaped connecting members 21, 21, ... As the number of legs of the spacer plate 20b (in this embodiment, three in the circumferential direction of the tunnel, six in total). Is fixed, and a through hole (not shown) for a bolt communicating with the skin plate 13a of the inner frame 13 is formed in the connecting member. Furthermore, the supporting member 20b is provided on the outer peripheral surface side of the inner frame 13 by screwing the tip end portion of the bolt, which penetrates the cone-shaped connecting member 21 from the inner peripheral surface side of the inner frame 13, into the nut 20c. It is in a fixed state.

An injection hole 14c for the backfill material G is formed in the skin plate 14a of the outer frame 14.

When the inner frame 13 and the outer frame 14 are assembled, they can be separated from each other as shown in FIG. 5, and when the outer frames 14 and 14 are connected, As shown in FIG. 6, a rubber waterproof material 2 is provided between the flange portions 14b, 14b.
With the two arranged, they are fixed by a connecting member 23 such as a bolt and a nut.

Next, a method of constructing the seal lining in the non-segment shield construction method of the present invention will be described.

(I) First, as shown in FIG. 5, after the leg portions 20b of the supporting member 20 are arranged on the tops of the connecting members 21, 21, ... Fixed to the outer peripheral surface of the inner frame 13, Connection member 21 from the inner peripheral surface side of 13
The inner frame 13 and the supporting member 2 are supported by inserting a bolt into the inside of the
0 and are fixed and integrated.

(Ii) Next, the inner frame 13 and the outer frame 14 are separately assembled along the wall surface H of the mine excavated in the ground E. First, as shown in FIG. A frame (14) is arranged at the bottom of the mine, and an inner frame (13) integrated with the supporting member (20) is installed above the frame (14).

At that time, the outer frame 14 is tightly connected to the existing outer frame (not shown) in the excavating direction by the flange 14b by a connecting member (not shown).

(Iii) Next, as shown in Fig. 7 (b), a new outer frame 14 is connected to the outer frame 14 arranged at the lower portion so as to be adjacent in the circumferential direction. At that time, as shown in FIG. 6, the outer frame 1
While the rubber waterproofing material 22 is disposed between the francies 14b and 14b of 4,4, the flange is tightly connected by a connecting member 23 such as a bolt and a nut, and in the same manner as the tunnel excavation direction. Also in the above, it is tightly connected to an existing outer frame (not shown).

(Iv) Next, as shown in FIG. 7 (c), after the inner frame 13 in which the supporting material 15 is integrated is arranged by the erector 17 on the upper part of the tightly bound outer frame 14, FIG. As shown in d), the inner frame 13 is tightly connected in the circumferential direction and the tunnel excavation direction by mounting a connecting member such as a bolt or a nut between the existing inner frame 13 and the flanges 13b and 13b.

(V) In the same manner, the left and right are alternately alternated from the bottom to the top of the mine in the annular shape at the rear of the shield machine 11 (hereinafter, one annularly assembled formwork is referred to as an "annular body").
Abbreviated).

(Vi) Next, a reaction force is applied to the inner frame 13 of the annular body to drive the jack 12, thereby propelling the shield machine 11 for a certain distance.

(Vii) By repeating the steps (i) to (v), several annular bodies (four in this embodiment) are continuously arranged.

(Viii) Next, the inner frame 13 of the annular body that was finally assembled
By attaching the end frame 15 to the inner frame 13, a cylindrical closed space S is formed between the inner frame 13 and the outer frame 14 in which concrete can be placed.

Here, as shown in FIG. 1, a concrete placing section a
Is completed. In the concrete placing section a, with respect to the soil water pressure received from the ground E, the load is transmitted from the outer frame 14 to the inner frame 13 via the supporting member 20, and is supported by the inner frame 13.

(Ix) Next, the above steps (i) to (v) were repeated to further install one annular body in front of the concrete placing section a (left side with respect to the paper surface of FIG. 1). rear,
Between the inner frame 13 and the outer frame 14 of the concrete placing section a, concrete is placed by the concrete placing machine 16 and the seal-lining R is applied. The concrete is filled into the mold through an injection hole (not shown) of the inner frame 13.

Therefore, the outer frame 14 and the supporting member 20 are permanently buried in the concrete as a lining material, and the gable frame 15 is also buried.

(X) Further, the excavated pit is lined by sequentially repeating the steps (i) to (ix). In this way, as the lining is sequentially performed, the unconsolidated concrete section b in which the concrete is not hardened further behind the concrete placing section a (right side with respect to the paper surface of FIG. 1). After that, the solidified concrete section c in which the concrete is completely hardened is successively completed. Backfill grout G is injected into the solidified concrete section c between the outer frame 14 and the wall of the excavated mine.

The backfill grout G is a backfill grout injection hole 14c.
It is performed from an injection hole of an inner frame 13 (not shown) communicating with

In the consolidated concrete section c, due to the strength development of the seal lining R, the seal lining R is
In addition to being responsible for the long-term loads received from the ground E,
Due to the adhesive force acting between the inner frame (13) and the inner frame (13), it will be responsible for the short-term jack thrust that acts when the shield machine (11) is propelled. In the present embodiment, the jack thrust can be received not only by the adhesive force between the concrete and the skin plate 13a but also by the cone 21 projecting from the outer peripheral surface of the skin plate 13a into the seal lining R. The resistance is significantly increased, and the length of the solidified concrete section can be shortened.

(Xi) Next, as shown in FIG. 1, the solidified concrete section c completed as described above has a predetermined length (in the present embodiment, at least eight continuous annular bodies are provided). After confirming that it has reached the corresponding length), the inner frame 13 of the formwork dismantling section d behind the solidified concrete section c is sequentially dismantled from the rearmost part by using the erector 18.

To dismantle, first of all, the supporting material 20 from the inner peripheral surface side of the inner frame 13.
After removing the bolts screwed to the nuts 20e fixed to the base end of the spacer plate 20b by unscrewing, and releasing the fixing between the supporting member and the inner frame, the inner frame 13 in the above state is removed by the erector 18 The mold is removed from the surface of the concrete lining R by.

(Xii) Finally, from the surface of the seal lining R,
By removing the inner frame 13, the holes remaining in the cone shape are filled with the grout material G to complete the tunnel. The dismantled inner frame 13 is diverted in the rear part of the shield machine 11 as an inner frame of an annular body to be newly assembled on the excavated wall surface.

Therefore, in this construction method, in the primary lining,
Since the tunnel is completed by applying seal-lining R, the seal-lining R is responsible for long-term load such as earth pressure and short-term load such as jack thrust.
The outer frame 14 embedded in concrete becomes cheaper,
It eliminates the need for expensive segments as lining material and the concrete lining as secondary lining.

Further, according to the present invention, when the form frame is formed into an annular shape for constructing the seal-lining R along the wall surface of the mine, first the outer frame 14 is assembled along the wall surface of the mine, and then the outer frame 14 is assembled. Since the inner frame 13 integrated with the supporting material 20 is assembled inside the, and concrete is then placed between them, the outer frame can be directly connected to the work. It is possible to improve the assembling performance, and the outer frames are securely tightly connected to each other by the flanges 14b and 14b, so that the assembling accuracy can be significantly improved. Further, a special waterproof material is not required, and a simple structure in which a rubber plate material is simply sandwiched between the flanges 14b and 14b is sufficient, and the cost of the waterproof material can be reduced. As a result, it is possible to further reduce the manufacturing cost such as the processing cost of the outer mold to be buried.

Other embodiments or technical matters other than the above will be described below.

(I) It is optional to arrange reinforcing bars inside the seal-lining R to make it reinforced concrete, and to further increase the proof strength. At that time, however, the reinforcing bar work can be easily performed.

(Ii) Since it is not necessary to weld a supporting material or the like to the skin plate of the outer frame, it is possible to further reduce the manufacturing cost of the outer frame.

(Iii) Maintenance of the skin plate and supporting material is facilitated, and workability in the mine is improved.

[Advantages of the Invention] As described above, the present invention provides an outer frame formed by a plate material in an arc shape, and an inner frame that is inscribed in the outer frame and that forms a space for concrete pouring inside. Since the supporting member provided and the inner frame detachably attached via the connecting member to the base end portion of the supporting member were provided, the outer frame was first assembled along the wall surface of the mine. rear,
Assemble the inner formwork inside this outer formwork via the supporting material,
Since concrete is then placed between them, it is possible to easily perform the work of binding the outer formwork, improve the assembly accuracy, and improve the water blocking effect. it can. As a result, it becomes possible to use a water blocking material having a simpler shape and structure, and it is possible to reduce the manufacturing cost of the outer mold.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a side sectional view of a tunnel constructed using a non-segment shield method, and FIG. 2 is a sectional view of the present invention. Front view of the mold, FIG. 3 is a side view of FIG. 1, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, and FIG. 5 is a front view of the mold in which the outer frame and the inner frame are separated. 6 and 6 are front sectional views of the outer frame in a state in which they are tightly connected by bolts and nuts, and FIG. 7 is for explaining the construction method of the present invention. (A) is a form at the bottom of the pit And (b) is a sectional view of the tunnel for explaining a place where only the outer frame is arranged and tightly connected to the form frame arranged at the bottom,
(C) is a cross-sectional view of the tunnel for explaining that the inner frame is arranged inside the tightly bound outer frame, and (d) is a cross-sectional view of the tunnel for explaining that the inner frame is tightly bound. , FIG. 8 is for explaining the conventional technique,
It is a side view of the integrated formwork. R …… Seallining, H …… Mine wall, 11 …… Shield machine, 13 …… Inner frame (inner form), 14 …… Outer frame (outer form), 20 …… Supporting material, 21 …… Connection members (cone-shaped connection members), 23 ... Bolts, nuts (connection members).

Front page continuation (72) Inventor Shinichi Nishimura 2-16-1 Kyobashi, Chuo-ku, Tokyo Within Shimizu Construction Co., Ltd. (56) Reference JP 62-220697 (JP, A) JP 60-141997 (JP, A)

Claims (2)

[Claims] 1. A connecting member for connecting an outer formwork and an inner formwork, which are divided into a plurality of pieces in the circumferential direction and have a predetermined width in the digging direction, along a wall surface of a mine formed in a rear portion of a shield machine for digging. After assembling it into a cylindrical shape while integrating it with each other, concrete is placed between the inner mold and the outer mold for seal-lining, and after the seal-lining is solidified, the inner mold is removed. A method of constructing seal-lining in the non-segment shield construction method in which a tunnel is built in the ground while reusing it as a mold and assembling it on the newly excavated wall surface. After assembling along the wall surface, the inner formwork is assembled inside the outer formwork via the supporting material, and then concrete is placed between them, which is a non-segment type. How to build a shield lining in the field method. 2. A formwork used in a non-segment shield construction method, which comprises an outer formwork formed by a plate material in an arc shape, and an inner formwork which is inscribed in the outer formwork and is placed on the inner peripheral surface side of concrete. A non-segment segment equipped with a supporting material arranged to form a space and an inner formwork detachably attached to the base end of the supporting material via a connecting member.
Formwork for seal-lining in the shield construction method.