JP3253854B2 - Inner formwork for concrete lining of tunnel walls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner formwork for forming a lining of cast-in-place concrete on a tunnel wall excavated by a shield method.

[0002]

2. Description of the Related Art In the shield method, every time a tunnel of a certain length is excavated by a tunnel excavator, concrete lining is performed on an excavation wall surface. The formwork is assembled in an annular shape along the excavation wall in accordance with the front end face of the previously assembled inner formwork, and concrete is cast between the inner formwork and the excavation wall to perform lining. At the same time, the excavation is carried out by supporting the reaction force of the tunnel excavator on the front end face of the inner formwork.

Conventionally, such an inner formwork for concrete lining has conventionally been formed into an arc shape formed by dividing a plurality of sections in a circumferential direction of a tunnel wall surface as described in Japanese Patent Application Laid-Open No. Hei 4-216799. It is known that a curved divided form piece and a key form piece having a triangular cross section to be interposed between opposed end faces of adjacent divided form pieces,
After this key form piece is pivotally attached to both ends of each divided form piece, the divided form pieces without the key form piece are separated from each other by a predetermined distance in the tunnel circumferential direction on the tunnel wall surface. Then, insert the divided formwork pieces with key formwork pieces into the above-mentioned space portions to form an annular inner formwork with the plurality of divided formwork pieces, and rotate the key formwork pieces. Then, after being interposed in the triangular space formed between the opposed ends of the divided formwork pieces, the inner formwork is fixed by pivotally connecting the ends to the divided formwork pieces, and then, Concrete is being poured.

[0004]

However, according to the above-described inner mold, a plurality of divided mold pieces are separated, and a key mold piece is attached to and detached from these divided mold pieces. Work is required, and assembling work and dismantling work take considerable time, resulting in a problem that work efficiency is reduced. Further, after the plurality of divided form pieces are arranged along the circumferential direction of the tunnel wall with an interval at which the next divided form piece can be interposed, a key form piece is pivotally attached to the end of the next divided form piece. Since the mold pieces are inserted into the gaps, it is difficult to accurately align them, and a gap occurs between the facing end faces of adjacent divided mold pieces in the tunnel length direction or in the tunnel radial direction. Has a problem that a step is generated and the inner frame cannot be assembled accurately.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it possible to accurately and efficiently assemble a divided form member along a tunnel excavation wall surface, thereby achieving high accuracy. It is an object of the present invention to provide an inner formwork for concrete lining that enables formation of a good concrete lining and that can be easily dismantled and moved.

[0006]

In order to achieve the above object, according to the present invention, there is provided a movable carriage which moves in the length direction of a tunnel on a beam provided at the center of the tunnel, and is mounted on the movable carriage. An inner mold for concrete lining supported detachably by a telescopic device and expanded and contracted in the radial direction of the tunnel, with both end faces inwardly inclined in a direction of becoming narrower from the outer peripheral side toward the inner peripheral side. A plurality of female mold members formed on an inclined surface, and both end surfaces can be joined to the inwardly inclined surface of the female mold member by inclining in a direction of increasing the width from the outer peripheral side toward the inner peripheral side. It comprises a plurality of male mold members formed on an outwardly inclined surface, and these female mold members and male mold members are alternately arranged in the circumferential direction of the tunnel and adjacent male and female mold members are formed. The opposite ends are rotatably connected with a connecting rod, and the male and female The male mold member is configured to move in the tunnel radial direction by the telescopic device in.

According to a second aspect of the present invention, in the inner mold for concrete lining of the tunnel wall, a link mechanism is provided in a female mold member, and a fulcrum of the link mechanism is set to a female mold member. And the free end of the link mechanism is pivotally connected to the connecting rod so that the male and female form members are joined without collision.

[0008]

The inner formwork of a plurality of rings is assembled on the excavated wall surface excavated by the tunnel excavator, and the concrete placed between the excavated wall surface and the inner formwork is cured until it hardens. The tunnel excavator excavates by taking a reaction force on the front end face of the foremost inner formwork, and excavating a tunnel with a length of one ring of the inner formwork. The formwork is dismantled, and the inner formwork is moved to the rear end of the tunnel excavator by a movable carriage traveling on the beam, and assembled along the excavated wall surface.

In the above work process, the inner mold is dismantled by simultaneously contracting the expansion and contraction devices connected to the male mold members, so that all the male mold members come off the concrete lining surface and the outwardly inclined end faces thereof are raised. Move away from the opposing inwardly inclined end face of the adjacent female form member. At this time, since both ends of the male frame member are rotatably connected to the opposite ends of the female frame member by connecting rods, the male die member moves as the male frame member moves toward the center of the tunnel. When the female frame members connected to both ends of the frame member are separated from the concrete lining surface toward the center of the tunnel while being attracted to each other by the connecting rod, the male frame members are completely separated from the female mold member completely inward. Both ends of the adjacent female form members come into contact with each other, and the annular form formed by these female form members has a smaller diameter than the assembled inner form.

In this way, the movable bogie is advanced along the beam while each male mold member of the reduced inner mold is supported by the telescopic device, so that the reduced inner mold can be moved to the rear of the tunnel excavator. The inner mold is conveyed to the end, and the inner mold is expanded at that position to assemble the inner mold with the rear end joined to the front end of the previously assembled inner mold. This assembly is performed by extending the telescopic device. That is, when the telescopic device is extended, the male form member moves toward the excavation wall surface, and the adjacent female form member moves toward the excavation wall surface while being pushed and expanded via the connecting rod in accordance with the movement. A male mold member is inserted between the opposed end surfaces of the adjacent female mold members, and an inner mold having an enlarged diameter when the two inclined end surfaces of the male mold member are joined to the opposed inclined end surfaces of the female mold member. It goes up.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. A is an annular ring whose outer diameter is equal to the inner diameter of a concrete lining C lining a tunnel excavation wall B. The inner mold is composed of a plurality of male mold members 1 and female mold members 2, and these male mold members 1 and female mold members 2 are alternately arranged in the circumferential direction of the tunnel T. The connecting rods 3, 3 having a fixed length are provided between the opposite ends of the male and female frame members 1, 2.
Are rotatably connected to each other.

While the lengths of the male and female mold members 1 and 2 corresponding to the length direction of the tunnel are formed to be the same length,
The arc width corresponding to the circumferential direction of the tunnel makes the female frame member 2 wider than the male frame member 1. Male form member 1
Is a slanted end face that is inclined outward so that the width of the male form member 1 in the tunnel circumferential direction gradually increases from the outer circumferential side toward the inner circumferential side, that is, from the side of the excavation wall B toward the inside of the tunnel T. 1a, 1a, and the entire shape is formed as an equilateral trapezoidal shape. On the other hand, the female frame member 2 has inclined end faces 2a, 2a whose both end surfaces are inclined inward so that the width of the female frame member 2 in the tunnel circumferential direction gradually decreases from the outer peripheral side to the inner peripheral side. Is formed. The outwardly inclined end surface 1a of the male mold member 1 and the inwardly inclined end surface 2a of the female mold member 2 are formed so as to be brought into surface contact. The male mold member 1 is inserted between the facing inwardly inclined end faces 2a, 2a of the adjacent female mold members 2, 2 on both end sides, and is referred to as a male mold member. The mold member 2 is a female mold member because it is the side that receives the male mold member 1.

The male and female mold members 1 and 2 are made of a metal plate such as a steel plate. That is, the outer peripheral surface facing the excavation wall B is formed of form plates 1b and 2b curved along the excavation wall B as shown in FIGS. 2 and 3, and tunnels are formed from four sides of the form plates 1b and 2b. Front and rear wall plates 1 of constant height inward
c and 2c are integrally fixed to both side wall plates on which the inclined end surfaces 1a and 2a are formed, and a reinforcing member (not shown) is fixed inside the members as necessary.

The structure of the connecting rod 3 for connecting the opposite ends of the male and female frame members 1 and 2 includes a bracket 4 at the front and rear inner surfaces of the frame plates 1b and 2b at the opposite ends of the male and female frame members 1 and 2. , 4;
5 and 5, and both ends of the front and rear connecting rods 3 and 3 are pinned to the opposite brackets 4 and 5 of the male and female form members 1 and 2 respectively.
The wall plates on which the inclined end surfaces 1a, 2a of the male and female frame members 1, 2 are formed are cut out 7 so that the connecting rod 3 can be rotated. ing. In addition,
The connecting rod 3 is provided on the male form member 1 more than the pivot portion on the female form member 2 side.
The male and female mold members 1 and 2 are connected so that the pivot portion on the side is located closer to the inside of the tunnel, so that the facing end surfaces of the male and female mold members 1 and 2 are securely joined to each other.

Further, when the male frame member 1 is inserted between the facing inwardly inclined end surfaces 2a, 2a of the adjacent female frame members 2, 2, the male frame member 1 is moved closer to the one female frame member 2. In order to prevent it from moving and becoming unable to be inserted, the male form member 1
There is provided a rotation angle regulating means for the connecting rod 3 so that one end of the connecting rod 3 pivotally attached to the female mold member 2 is always positioned inside the other end pivotally attached to the female frame member 2. As shown in FIG. 4, this restricting means causes one end of a connecting rod 3 pivotally connected to the end of the male frame member 1 by a pin 6 to protrude from the pivotal connection. The stopper members 8a and 8b are fixed to each other so that the inner stopper member 8a is brought into contact with and received by the receiving surface 9 provided on the inner side wall of the male frame member 1. .

Therefore, as shown in FIG.
In a state in which the connecting member 3 is inwardly separated from the female frame member 2, the one stopper member 8 a abuts on the receiving surface portion 9 of the male frame member 1 and is received, and the connecting rod 3 rotates further. Is stopped,
The one end pivot portion is always located closer to the inwardly inclined end surface 2a than the other end pivot portion on the female frame member 2 side. When the outwardly inclined end surfaces 1a, 1a of the male frame member 1 are joined to the inwardly inclined end surfaces 2a, 2a to be completely inserted and interposed, the other stopper member
8b abuts against the inner wall surface of the outwardly inclined end face 1a of the male form member 1,
It is configured to be accepted. In order to form the expandable and contractable inner frame A by the plurality of male and female frame members 1 and 2 connected by the connecting rod 3, at least these male and female frame members 1 and 2 are paired as shown in the figure. It is desirable to divide it into six or more pairs.

FIGS. 5 and 6 show the inner mold A thus constructed.
As shown in the figure, behind the tunnel excavator S, it is transported in the lengthwise direction of the tunnel while being supported by a telescopic device D installed on a movable trolley E. That is, the front end of the long beam F disposed at the center of the tunnel is connected to the rear end of the tunnel excavator S, and the movable carriage E integrally provided with the telescopic device D is moved back and forth along the beam F. It is configured to be. The beam F is a hollow tube having a polygonal cross section (hexagon in the figure) having a number of sides corresponding to the number of the male mold members 1, and its length is assembled behind the tunnel excavator S. The length of the inner form A of one ring is added to the sum of the lengths of the inner forms A of the plurality of rings, and the length of the rear end of the inner form A is equal to the inner surface of the concrete lining C. It is movably supported in the lengthwise direction of the tunnel by rolling supporting leg members 10 with wheels. The beam F is connected to the rear end of the tunnel excavator S so as to move forward integrally with the tunnel excavator S. It may be configured to move independently in the length direction of the tunnel via the supporting leg material.

A movable carriage E that moves back and forth along the beam F has a short cylindrical frame 11 of a regular hexagonal shape with an enlarged cross-sectional shape of the beam F concentrically over the beam F, and its three frames A wheeled leg 12 is integrally provided on the inner surface of the
13 has a structure in which it is supported on the flat surface of the beam F so as to freely roll. Although not shown, the wheels 13 are rotated by a motor to move the movable frame E back and forth in the longitudinal direction of the beam F.

The telescopic device D is installed on the outer surface of a frame 11a forming each side of the hexagonal frame 11 of the movable carriage E in correspondence with each male frame member 1 of the inner die A. ing. The specific structure is that dovetail-shaped guide grooves 14 are formed on both sides of the center of each frame portion 11a in parallel with the longitudinal direction, and these guide grooves 14 are formed.
14 is slidably engaged with the bottom surfaces of the front and rear sliding pieces 15 and 16, respectively, and a pair of support rods corresponding to the guide grooves 14 and 14.
17 and 18 are crossed to form a pantograph, connected so as to be able to move up and down, and the base ends of these support rods 17 and 18 are rotatably connected to the front and rear sliding pieces 15 and 16. While
The distal end is configured to be detachably connected by a connecting pin 21 to a connecting hole formed in brackets 19 and 20 projecting from front and rear portions of the inner surface of the corresponding male frame member 1. Further, the front and rear sliding pieces 15, 16 are jacks arranged on the frame portion 11a.
The supporting rods 17 and 18 connected to the male frame member 1 are connected to and separated from each other by expansion and contraction of the jack 22 so as to expand and contract.

In addition, without being limited to the expansion device D, a jack is installed on each frame portion of the movable carriage E, and the rod end of the jack is detachably attached to the inner surface of the male frame member 1. Or a suitable device such as a telescopic device using a screw mechanism. Also, the distal ends of the supporting rods 17 and 18 of the telescopic device D are connected to the brackets of the male frame member 1.
As means for detachably connecting to 19 and 20, in addition to the above-described pin connection, automatically operating gripping means is attached to the distal ends of the support rods 17 and 18, and the male mold frame member is provided by the gripping means. The first brackets 19 and 20 may be configured to be detachably gripped.

Next, a construction method for performing concrete lining on the tunnel excavation wall B using the inner formwork A configured as described above will be described. Until the concrete lining the wall surface excavated by the tunnel excavator S is hardened, the inner form A
As shown in FIG. 5, the inner formwork A is assembled with a plurality of rings in a state where the front and rear end faces are integrally joined from the rear end of the tunnel excavator S toward the rear of the tunnel as shown in FIG. The concrete is being cured.

The tunnel excavator S excavates the tunnel T by rotating the cutter plate 23 and extending the rod end of the propulsion jack 24 against the front end surface of the innermost form A at the foremost portion. When the excavation for the length of one ring of the inner mold is completed, the inner mold A at the rearmost portion where the hardening of the concrete is completed is dismantled. This dismantling operation is performed by the inner form A
In addition to releasing the connection with the bolts and the like to the front inner form A connected to the moving carriage E, the moving carriage E is moved rearward along the beam F to the position of the rearmost inner form A, and then each of the moving carriages E The supporting rod 1 of the telescopic device D installed on the frame 11a
7 and 18 are extended by the operation of the jack 22, and the ends thereof are connected and fixed to brackets 19 and 20 provided on the front and rear portions of the inner surface of the male frame member 1 of the inner frame A, and then the telescopic device D is contracted. This is done by letting

That is, after connecting the distal ends of the supporting rods 17 and 18 of the telescopic device D to the male frame member 1 of the inner die A, each telescopic device D
When the support rods 17 and 18 are contracted toward the center of the tunnel, the male frame member 1 is pulled toward the center of the tunnel and separates from the inner surface of the concrete lining C, and the outwardly inclined end surfaces 1a at both ends thereof are adjacent to each other. Inclined end face of female form member 2
2a, the adjacent female form members 2 and 2 are drawn in the direction of approaching each other via the connecting rod 3 in accordance with the separation, the female form member 2 comes off the concrete lining C, and the entire inner form A is removed. Reduce diameter. When each male mold member 1 reaches a position away from the inwardly inclined end surfaces 2a, 2a of the adjacent female mold members 2, 2 facing each other as shown by a virtual line in FIG. The opposite end portions of the frame members 2 and 2 are not in contact with each other, and the entire inner mold A is not further reduced in diameter. The outer diameter of the inner form A whose diameter has been reduced in this way is smaller than the inner diameter of the inner form A whose diameter has been increased when assembled.

Next, the movable carriage E is moved to the rear end side of the tunnel excavator S along the beam F, and the inner form A having the reduced diameter is made to correspond to the excavation wall B. Since the outer diameter of the reduced inner form A is smaller than the inner diameter of the existing inner form A assembled on the excavation wall B, the reduced inner form A is replaced with the existing inner form A. Truck E in the tunnel surrounded by
, And can be smoothly transported while supported.

When the movable trolley E moves forward to the position of the excavation wall B, the inner form A is expanded along the excavation wall B by extending the telescopic device D at that position, and the existing inner die assembled earlier is assembled. The frame A is assembled while the rear end face is joined to the front end face. At this time, when the tunnel excavator S is excavating the diagonal shaft for laying the pressure pipe for power generation obliquely upward, the plurality of propulsion jacks mounted in the rear end of the tunnel excavator S The rod end of 24 is received on the front end face of the previously assembled inner formwork A to prevent the tunnel excavator S from slipping off. When the excavator retreats due to pressure or water pressure, the rod end of the propulsion jack 24 is received by the existing inner form A in the same manner as described above. Cannot be expanded by the presence of 24.

Therefore, first, several propulsion jacks 24 disposed on the upper peripheral side of the tunnel excavator S are contracted,
After several propulsion jacks 24 on the lower peripheral side are received at the front end face of the existing inner formwork A to prevent slipping,
FIG. 7 shows only the female form member 2 on the upper peripheral side of the reduced inner form A.
As shown in (2), it is moved toward the excavation wall surface B, and the rear end face is joined to the front end face of the female form member 2 on the upper peripheral side of the existing inner form A.

In this operation, the male frame members 1, 1 connected to both ends of the female frame member 2 on the upper peripheral side are extended by the supporting rods 17, 18 of the respective telescopic devices D, D. Done by That is, when the support rods 17 and 18 of these telescopic devices D and D are extended, the male frame members 1 and 1 connected or gripped to the tips of the support rods 17 and 18 extend along the excavation wall B in the radial direction of the tunnel. , And the female frame member 2 is pushed and expanded by the connecting rods 3, 3 connected to both ends of the female frame member 2.

When the rear end face of the female form member 2 is joined to the front end face of the female form member 2 on the upper peripheral side of the existing inner form A without any step, both ends of the female form member 2 are inclined inward. Facing outward inclined end surfaces 1a, 1a of male mold members 1, 1 on both sides on end surfaces 2a, 2a.
Are joined, and the supporting rods 17, 18 of the telescopic devices D, D
After adjusting the amount of expansion and contraction to make a state where there is no step between these joint end surfaces, the strokes of the supporting rods 17 and 18 of the elastic devices D and D are fixed, and the joint end surfaces of the male and female form members 1 and 2 are fixed. After connecting the front end surfaces of the male and female frame members 1 and 2 of the existing inner frame A with the rear end surfaces of the male and female frame members 1 and 2 by bolts, the rod of the propulsion jack 24 is extended to The male and female form members 1 and 2 are received on the front end surfaces.

Next, after the propulsion jacks 24 disposed on both sides of the tunnel excavator S are contracted, the male frame members 1, 1 on both sides are moved to the respective extension devices D, D in the same manner as described above. The female form member 2 and the male form member 1, which have already been expanded to predetermined positions by extending the support rods 17, 18,
The upper and lower female form members 2 and 2 connected to each other via the upper side 1 are expanded by pushing, as shown in FIG.
1 outwardly inclined end surfaces 1a, 1a and its opposite inwardly inclined end surface 2
After a and 2a are fixed in a state where they are joined without any level difference and the end faces joined to each other are connected by bolts, the propulsion jack 24 is extended and received by the front end faces of the male and female form members 1, 2.

Similarly, after the propulsion jack 24 is retracted with respect to the female frame member 2 on the lower peripheral side, the male frame member 1 is pushed forward by the telescopic device D so that the female frame member on the upper peripheral side. 2, the male mold member 1 is joined via the male mold member 1, and the joint surfaces thereof and the opposing surfaces with the existing inner mold frame A are integrally connected by bolts, thereby assembling the inner mold frame A in an annular shape.

After assembling the inner form A along the fixed length of the excavation wall B excavated by the tunnel excavator S, concrete is placed in the ring-shaped space between the excavation wall B and the inner form A. And the concrete lining C which is continuous with the concrete lining C previously laid is constructed. In parallel with this concrete lining work, the propulsion jack 24 is extended by applying a reaction force to the front end face of the inner formwork A, thereby making the tunnel excavator S excavate and excavating a tunnel having a length of one ring of the inner formwork. I do. During the casting of concrete, the expansion and contraction device D is used to prevent deformation of the formwork during casting.
Hold the inner mold A.

When the concrete placement is completed, the gripping or connection of the telescopic device D to the inner formwork A is released, and the telescopic device D is moved to the rear end of the beam F by the movable carriage E to complete the hardening of the concrete. The rearmost inner mold A is reduced in diameter and dismantled by the same operation as described above. The reduced diameter inner formwork A is transported to the excavation wall B side behind the tunnel excavator S, assembled in the same manner as described above, and this operation is repeated to concretely excavate the excavation wall B sequentially. is there.

FIGS. 10 and 11 show the male form member 1 and the female form member 2 respectively.
And a link mechanism for suppressing free movement of the male form member 1 on a predetermined trajectory with respect to the female form member 2 so as not to collide with the female form member 2. It is configured so as to smoothly and accurately join. That is, the center of the first link 25 is rotatably and pivotally mounted on the center of the inner surface of the female frame member 2 in the plane direction along the frame frame plate 2b, and the second link 26 is provided at both ends of the first link 25. 26 is pivotally connected to the base end of the second link 26, and the distal end of the second link 26, 26 is an intermediate portion of the pair of front and rear connecting rods 3 connecting the male and female frame members 1, 2. It is pivotally connected to the center of connecting rods 27, 27 connected therebetween.

According to the link mechanism configured as described above,
A pair of front and rear connecting rods 3 provided on one end side of the female form member 2
And a pair of front and rear connecting rods 3 provided on the other end side have the same outward rotation angle with respect to the female frame member 2 around the pivotal attachment portion 6b of the bracket 5 protruding from the female frame member 2. The male frame members 1, 1 connected to both ends of the female frame member 2 via the connecting rods 3, 3, respectively, rotate the distal ends of the connecting rods 3, 3 while being restricted in the forward and backward directions and in the left and right directions. An inwardly inclined end face of the female form member 2 which is simultaneously moved by the same angle on the moving locus.
The outwardly inclined end face 1a can be accurately attached to and detached from 2a.

[0035]

As described above, according to the inner formwork for concrete lining of the tunnel wall of the present invention, the male form member having both end faces formed on the outward inclined end face and the both end faces formed on the inward inclined end face. And the female mold members formed in the same manner are alternately arranged, and the opposing ends of the adjacent male and female mold members are rotatably connected by a connecting rod, so that the inner mold has a plurality of male and female molds. The frame member is integrated by connecting rods, so that the inner carriage can be transported efficiently by the movable trolley, and the male mold member is moved in the tunnel radial direction by the telescopic device installed on the movable trolley. Because the telescopic device is extended, the distance between the adjacent female form members can be expanded via the connecting rod by extension, so that the diameter can be expanded to easily assemble in an annular shape, and the alignment with the previously assembled inner form can also be performed. Easy to do And than, Moreover, those that can be accurately bonded to the inclined end surfaces facing each other while restricting the displacement of the male and female mold members by connecting rods.

Further, when each male mold member of the assembled inner mold is moved toward the center of the tunnel by the expansion and contraction device,
The outwardly inclined end face of the male mold member is separated from the inwardly inclined end face of the female mold member, and the adjacent female mold members are attracted to each other via the connecting rod so that the mold can be surely released. The opposite end portions of the mold members can be joined to form an inner mold having a reduced diameter.
The dismantling operation can be performed efficiently, and the inner mold can be smoothly transported to the next concrete lining position with the diameter reduced.

[Brief description of the drawings]

FIG. 1 is a simplified front view of an inner mold,

FIG. 2 is a longitudinal sectional front view showing a connecting structure of the male and female form members;

FIG. 3 is a plan view thereof,

FIG. 4 is a vertical sectional front view of a connecting portion provided with a rotation angle restricting means;

FIG. 5 is a simplified longitudinal side view of a form moving trolley and a telescopic device arranged behind a tunnel excavator,

FIG. 6 is a longitudinal sectional front view thereof,

FIG. 7 is a simplified front view of a state in which the female frame member on the upper peripheral side has been moved in the radial direction;

FIG. 8 is a simplified front view of a state in which the female mold members on both side portions have been moved in the radial direction;

FIG. 9 is a simplified front view of a state in which the female frame member on the lower peripheral side has been moved in the radial direction;

FIG. 10 is a simplified longitudinal front view showing a free movement suppressing link mechanism of the male and female form members;

FIG. 11 is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male form member 1a Outward inclined end face 2 Female form member 2a Inward inclined end face 3 Connecting rod A Inner form B Excavated wall C Concrete lining D Telescopic device E Moving trolley F beam S Tunnel excavator T Tunnel

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/10

Claims (2)

(57) [Claims] 1. A movable carriage that moves in the length direction of a tunnel is disposed on a beam disposed at the center of the tunnel, and is supported detachably by a telescopic device installed on the movable carriage and expanded and contracted in a radial direction of the tunnel. A plurality of female mold members formed on an inwardly inclined surface, wherein both end surfaces are inclined in a direction of decreasing width from the outer peripheral side toward the inner peripheral side, A plurality of male mold members formed by forming both end surfaces in an outwardly inclined surface that can be joined to the inwardly inclined surface of the female mold member by inclining in a direction of increasing the width from the outer peripheral side toward the inner peripheral side. These female frame members and male frame members are alternately arranged in the circumferential direction of the tunnel, and the opposite ends of the adjacent male and female frame members are rotatably connected by connecting rods. The male form member in the form member is tunneled by the telescopic device. An inner formwork for concrete lining of a tunnel wall, wherein the inner formwork is configured to move in a direction. 2. A female / male frame member having a link mechanism disposed in a female frame member, a fulcrum of the link mechanism being provided on the female frame member, and a free end of the link mechanism being pivotally connected to the connecting rod. The inner formwork for concrete lining of a tunnel wall according to claim 1, wherein the inner formwork is configured to be joined without causing collision.