JP2014141880A - Joint formation method for lining concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint formation method for lining concrete, which enables an induction joint to be formed in an accurate position and at accurate depth by a cutting blade.SOLUTION: The center of a first joint Vc21 is cut on a secondary lining concrete surface Fc2 by a joint cutting member (cutter blade 562), and a second deep joint is linearly and deeply cut. In this case, a pair of guide rollers 572A and 572B are inserted into the first joint Vc21 to suppress displacement, and the second joint can be cut in an accurate position.

Description

  The present invention relates to formation of induced joints for causing cracks or cracks at predetermined locations on a tunnel lining surface (for example, an inner peripheral surface of secondary lining concrete).

Concrete cracks or cracks due to stress concentration due to various factors. The cracks and cracks cause problems such as water leakage, but it is difficult to predict where the cracks and cracks occur.
On the other hand, if a place where stress concentration is likely to occur, that is, an induction joint is intentionally formed on the concrete lining surface (for example, the inner peripheral surface of the secondary lining concrete), cracks and cracks will occur in the induction joint. As a result, it is possible to quickly and easily deal with water leakage caused by the occurrence.

  In order to form such an inductive joint, the first cutting edge formed on the peripheral edge of the circular cutter blade is used to cut a deep cut in the concrete lining surface and sandwich the first cutting edge from both sides and A technique has been proposed in which a stepped portion having a smaller diameter from the concrete lining surface than the deep notch is cut by a pair of second blade portions having a smaller diameter than the first blade portion (see Patent Document 1). .

However, according to the related art, when cutting a deep joint with a cutter blade, the cutting position of the joint is uneven due to vibration, and the deep joint cannot be cut accurately. .
Furthermore, in the prior art, the relative position between the guide rail and the secondary lining concrete surface is made constant in the radial direction of the tunnel, the longitudinal direction of the tunnel, and the lateral direction of the tunnel (width direction: direction perpendicular to the longitudinal direction). I can't. Therefore, there is a problem that the position of the induction joint and the depth from the inner peripheral surface of the secondary lining concrete cannot be made accurate.

Japanese Patent No. 2528692

  The present invention has been proposed in view of the above-described problems of the prior art, and it is an object of the present invention to provide a method for forming joint joints in lining concrete that can form induced joints at accurate positions and depths using a cutting blade. It is said.

The joint forming method of the lining concrete of the present invention is
In the space inside the secondary lining concrete (C2) (inner side of the tunnel), a circular distance is formed at a certain distance from the surface of the secondary lining concrete (C2) (inner side surface Fc2 of the tunnel). Arranging the guide rail (20);
A joint cutting device body (500) having a joint cutting member (cutter blade 562) and a pair of guide rollers (572A, 572B) is disposed on the guide rail (20), and the circumferential direction of the first joint (Vc21) ( The pair of guide rollers (572A, 572B) is arranged so that the first joint is arranged before and after the joint cutting member (562) in the direction in which the surface Fc2 of the secondary lining concrete C2 extends). Inserting into the joint (Vc21) and inserting the joint cutting member (562) into the first joint (Vc21) so as to be positioned at the center in the width direction of the first joint (Vc21);
While moving the joint cutting device main body (500) along the guide rail (20), the joint cutting member (562) cuts the center in the width direction of the first joint (Vc21) to a predetermined depth, and the second Moving the guide cutting member (562) along the guide rail (20) while pushing the joint cutting member (562) into the first joint (Vc21) so as to form the joint (Vc22).
It is characterized by having.

In carrying out the present invention, the first joint (Vc21) has a triangular cross-sectional shape, and the joint cutting member (cutter blade 562) has a triangular apex portion of the cross-sectional shape of the first joint (Vc21). It is preferable that the second joint (Vc22) that is deeply cut in a straight line is formed by cutting while pushing.
The guide rollers (572A, 572B) preferably have a cross-sectional shape complementary to the cross-sectional shape of the first joint (Vc21).

In the present invention, the guide rail (20) is attached to a movable support frame (10), and the movable support frame (10) is provided with a longitudinal movement means (30) for moving in the longitudinal direction of the tunnel and in a vertical direction. Vertical movement means (40) for moving, and width direction moving means (42) for moving in the width direction of the tunnel (lateral direction: direction orthogonal to the longitudinal direction),
The guide rail (20) or the moving support frame (10) is a measuring means (for example, a laser pointer 7) that measures a predetermined measurement point (7C) provided on the surface (Fc2) of the secondary lining concrete (C2). Have
In the step of arranging the arcuate guide rail (20), the measurement point (7C) is measured by the measurement means (7), and the measurement point (7C) is measured by the measurement means (7). The position of the guide rail (20) is preferably adjusted by the longitudinal direction moving means (30), the vertical direction moving means (40), and the width direction moving means (42).

  In the present invention, the joint cutting device body (500) includes a cylinder mechanism (540) for moving the joint cutting member (cutter blade 562) in the radial direction of the tunnel, and the joint cutting member (562) is the first joint. In the step of pushing into (Vc21), it is preferable to operate the cylinder mechanism (540, 710).

Further, in the present invention, a cylindrical member (stabilizer 573A) having a smaller diameter than the guide rollers (572A, 572B) is provided on the rotation shafts (574A, 574B) that rotatably support the pair of guide rollers (572A, 572B). 573B) are rotatably supported,
In the step of inserting the pair of guide rollers (572A, 572B) into the first joint (Vc21), the cylindrical member (stabilizers 573A, 573B) is the surface of the secondary lining concrete (C2) (inner circumference of the tunnel). It is preferably in contact with the side surface Fc2).

In the apparatus for constructing the jointing method for lining concrete described above,
An arc-shaped space separated from the surface of the secondary lining concrete (C2) (the inner peripheral surface Fc2 of the tunnel) in the space inside the secondary lining concrete (C2) (inner side of the tunnel). A guide rail (20);
A joint cutting device body (500) having a joint cutting member (cutter blade 562) and a pair of guide rollers (572A, 572B) and movable on the guide rail (20);
The joint cutting device main body (500) includes a pair of guide rollers (572A, 572B) and a link mechanism connected to the rotation shaft of the joint cutting member (562) and the joint cutting member (562) as the first joint (Vc21). ) Are provided with cylinder mechanisms (540, 710) to be pushed into.

In the present invention, the guide rail (20) is attached to a movable support frame (10), and the movable support frame (10) is provided with a longitudinal movement means (30) for moving in the longitudinal direction of the tunnel and in a vertical direction. Vertical direction moving means (40) for moving, and width direction moving means (42) for moving in the width direction of the tunnel (lateral direction: direction orthogonal to the longitudinal direction),
The guide rail (20) or the moving support frame (10) is a measuring means (for example, a laser pointer 7) that measures a predetermined measurement point (7C) provided on the surface (Fc2) of the secondary lining concrete (C2). Have
Based on the measurement result obtained by measuring the measurement point (7C) with the measurement means (7), the longitudinal movement amount, the vertical movement amount, and the width direction movement of the guide rail (20) and / or the moving support frame (10). It is preferable that a moving amount calculating means (60) for calculating the amount is provided.

  Further, in the present invention, the rotation shafts (574A, 574B) for rotatably supporting each of the pair of guide rollers (572A, 572B) have a smaller diameter than the guide rollers (572A, 572B), and a secondary lining work. It is preferable that cylindrical members (stabilizers 573A and 573B) that can contact the surface of the concrete (C2) (the inner peripheral surface Fc2 of the tunnel) are rotatably supported.

According to the present invention having the above-described configuration, the joint cutting member (cutter) is formed on the first joint (Vc21) formed in advance on the surface of the secondary lining concrete (C2) (the inner peripheral surface Fc2 of the tunnel). The second joint (Vc22) can be formed by cutting deeply in a straight line while pushing the blade 562).
And since the 2nd joint (Vc22) which cuts the secondary lining concrete (C2) deeply linearly tends to produce stress concentration, a crack and a crack will occur from the 2nd joint. It can serve as a trigger joint to induce cracks and cracks.

When the second joint (Vc22) is cut and formed, the first lining formed on the surface of the secondary lining concrete (C2) (the inner peripheral surface Fc2 of the tunnel) at the time of placing the concrete By inserting a pair of guide rollers (572A, 572B) into the joint (Vc21) and pushing the guide rollers (572A, 572B) into the first joint (Vc21), the circumferential direction of the first joint (Vc21) For the first joint Vc21 extending in the surface Fc2 of the secondary lining concrete (C2), a pair of guide rollers (572A, 572B) are arranged before and after the joint cutting member (cutter blade 562). Therefore, when cutting the second joint (Vc22) on the secondary lining concrete (C2), the first joint (Vc21), the guide rollers (572A, 572B) and the joint The relative position of the cutting member (cutter blade 562) is always constant, joint cutting member (562) will be displaced by the vibration during cutting (so-called "would blur") is suppressed.
Therefore, the position of the second joint (Vc22) can be accurately cut.

  In the present invention, the guide rail (20) is attached to the movable support frame (10), and measuring means (for example, the laser pointer 7) for measuring the measurement point (7C) on the guide rail (20) or the movable support frame (10). When the guide rail (20) is disposed, the measurement point (7C) is measured by the measurement means (7), and the measurement point (7C) is measured by the measurement means (7). If the position of the guide rail (20) is adjusted in the direction, the vertical direction, and the width direction, the relative position between the surface (Fc2) of the secondary lining concrete (C2) and the guide rail (20) can always be constant. Since it is possible, the joint cutting member (cutter blade 562) provided on the joint cutting device body (500) moving on the guide rail (20) and the surface of the secondary lining concrete (C2) The relative positions of fc2) is also always constant, it is is able to accurately form the position of the second joint (Vc22).

In carrying out the present invention, in the joint cutting device main body (500), the guide rollers (572A, 572B) are disposed on the rotation shafts (574A, 574B) that rotatably support the pair of guide rollers (572A, 572B). Smaller cylindrical members (stabilizers 573A and 573B) rotatably support the cylindrical members (stabilizers 573A and 573B) on the surface of the secondary lining concrete (C2) (the inner peripheral surface Fc2 of the tunnel) If the second joint (Vc22) is cut, in addition to pressing the pair of guide rollers (572A, 572B) against the first joint (Vc21), the cylindrical member ( Stabilizers 573A and 573B) are brought into contact with the surface of the secondary lining concrete (C2) (the inner peripheral surface Fc2 of the tunnel). And, the relative positional relationship between the first joint (Vc21) and joint cutting member (562) is fixed more firmly.
As a result, the joint cutting member (562) is further prevented from being displaced (so-called “shake”), and the position of the second joint (Vc22) is cut more accurately.

Here, in the present invention, the joint cutting member (cutter blade 562) has a predetermined cutting depth by always keeping the relative position of the guide rollers (572A, 572B) and the joint cutting member (cutter blade 562) constant. The angle formed by the guide rollers (572A, 572B) and the joint cutting member (cutter blade 562) is fixed (to an angle that provides the predetermined cutting depth).
As a result, when the guide rollers (572A, 572B) come into contact with the first joint (Vc21), the joint cutting member (cutter) is used regardless of the relative position to the inner peripheral surface of the secondary lining concrete (C2). The cutting depth of the blade 562) is always constant.

Furthermore, in this invention, in order to cut the secondary lining concrete (C2) with the cutter blade (562) to form the second joint (Vc22), the guide rail (20) is preliminarily attached to the secondary lining concrete (C2). ) In the radial direction. According to the present invention, it is possible to cut the secondary lining concrete (C2) to form the second joint (Vc22) by automatic operation. Therefore, the secondary lining concrete (C2) is cut. Once the work starts, no further work is required by the worker.
Further, according to the present invention, by moving the joint cutting device body (500) in the tunnel longitudinal direction simultaneously with the secondary lining centle (moving mold), the secondary lining work, It is possible to reduce the time lag with the induced joint forming operation as much as possible. In other words, in the secondary lining work and the induced joint forming work, the occurrence of cycle time loss time can be minimized.

It is a front view which shows 1st Embodiment of this invention. It is a side view of a 1st embodiment. FIG. 3 is a detailed view of part A in FIG. 2. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. It is C arrow line view in FIG. It is a side view which shows the state which inserted one guide roller in the joint cutting apparatus which concerns on 1st Embodiment in the 1st joint. It is a front view of the joint cutting device main part used by a 1st embodiment. It is a side view which shows the state which is cutting the 2nd joint with the cutter blade in the joint cutting device main body which concerns on 1st Embodiment. FIG. 9 is a cross-sectional view taken along the line XX in FIG. 8. It is sectional drawing which shows the construction state of the secondary lining concrete in which the 1st joint was formed previously. It is XX cross-sectional arrow view of FIG. It is a block diagram which shows the structure which concerns on the positioning control in the joint forming apparatus of the lining concrete which concerns on 1st Embodiment of this invention. It is a flowchart which shows the movement control of the movement support frame in 1st Embodiment of this invention. In 2nd Embodiment of this invention, it is a side view which shows the state before inserting a guide roller in a 1st joint. It is an AA arrow line view of FIG. In 2nd Embodiment, it is a side view which shows the state in which the guide roller and the cutter blade were inserted in the 1st joint. In 3rd Embodiment of this invention, it is a side view which shows the state before inserting a guide roller in a 1st joint. In 3rd Embodiment, it is a side view which shows the state in which the guide roller and the cutter blade were inserted in the 1st joint. It is A arrow line view of FIG. It is a B arrow line view of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the joint forming apparatus for lining concrete according to the first embodiment of the present invention is indicated as a whole by reference numeral 100, and is arranged at a construction position in a tunnel (a cross section is shown in FIG. 1). Has been.
Here, the left-right direction in FIG. 1 is called the tunnel width direction (width direction), the left-right direction in FIG. 2 is called the tunnel longitudinal direction (longitudinal direction), and the up-down direction in FIGS. 1 and 2 is the vertical direction of the tunnel. (Vertical direction).
1 and 2, the joint forming device 100 includes a moving support frame 10, a pair of guide rails 20, and a joint cutting device main body 500 (particularly see FIGS. 6 to 9: not shown in FIG. 2). ing.

The movable support frame 10 includes a horizontal portion 11, a plurality of vertical members 12 and 13, a plurality of horizontal members 14, and two sets of lower horizontal members 15.
A pair of parallel, arc-shaped guide rails 20 are attached to a part of the plurality of vertical members 12 and 13 and the horizontal member 14 via a connecting member J.
The pair of guide rails 20 bend the grooved steel in an arc shape, and when performing induction jointing, the outer peripheral flange surface of the arc shape has a uniform distance from the surface Fc2 of the secondary lining concrete C2. It is arranged along the tunnel cross section.
Each of the two sets of lower horizontal members 15 is fixed to the lower end of the vertical member 12.
The movement support frame 10 is equipped with an operation panel 90 and a display unit 80 (see FIG. 12).

The movable support frame 10 can move in the longitudinal direction in the tunnel (the direction perpendicular to the paper surface in FIG. 1), the width direction of the tunnel (the horizontal direction in FIG. 1), and the vertical direction in the tunnel (the vertical direction in FIG. 1). It is.
3 to 5 show the moving means in the longitudinal direction, the width direction and the vertical direction in the tunnel.
3 and 5, four wheels 36 for moving in the longitudinal direction are arranged near both ends of the lower horizontal member 15. In the two sets of lower horizontal members 15, a longitudinal movement device 30 is provided in the vicinity of the end 15e.
The longitudinal movement device 30 includes an electric motor 31, a rotational force transmission member (for example, a double-row chain) 32, a wheel-side (for example, a double-row type) sprocket 33, an axle 34, and a pair of bearings 35. The wheel 36 is provided with flanges at both ends.

A small-diameter sprocket 310 (for example, a double row type) is fixed to the rotating shaft of the electric motor 31. The small-diameter sprocket 310 and the sprocket 33 are engaged with each other by a rotational force transmission member 32, and the rotational force of the electric motor 31 is transmitted to the wheels 36.
The electric motor 31 is, for example, an inverter motor and can perform normal rotation, reverse rotation, and fine rotation control.
Wheels 36 having spears formed at both ends and the sprocket 33 are integrally fixed to an axle 34 (see FIG. 5).

3 and 4, connection members 17 are fixed on the upper surfaces of both ends of the two sets of lower horizontal members 15. One end surface 17 e of the connection member 17 is disposed so as to coincide with one end surface 15 e of the lower horizontal member 15, and the other end surface of the connection member 17 is located closer to the center of the lower horizontal member 15.
A bracket 18 having a groove-shaped cross section is fixed so as to protrude downward from one end face 17e of the connecting member 17.

An upper end surface of a hydraulic jack 40 which is a vertical movement means is disposed so as to contact the bottom surface of the groove of the bracket 18.
A flow rate control valve 40V is interposed in the hydraulic piping system connected to the hydraulic jack 40. By controlling the flow rate control valve 40V, the upper end surface of the hydraulic jack 40 moves by an arbitrary amount in the vertical vertical direction. be able to. In FIG. 4, the flow control valve 40 </ b> V is shown, but the hydraulic piping system is not labeled.
The hydraulic jack 40 is disposed above the feed base 42 for movement in the width direction, and is configured so that the entire moving support frame 10 can move in the width direction in the tunnel (left and right direction in FIG. 1).

Although not clearly shown, the feed base 42 has a shaft on which a male screw is formed over substantially the entire length of the feed base in FIG. For example, the rotating shaft of the inverter motor 42M is connected to one end of the shaft, and fine control of the amount of feed movement is possible. When the inverter motor 42M is operated and controlled, the vertical moving means 40 above the feed base 42 is configured to move to an arbitrary position in the left-right direction in FIG.
A known commercially available product can be used as the unit (manual journal jack) in which the vertical direction moving means 40 and the width direction moving feed base 42 are combined together.
Control of the movement support frame 10 in the longitudinal direction, the width direction of the tunnel, and the vertical direction in the tunnel will be described later with reference to FIGS.

Next, with reference to FIGS. 6-8, the structure and effect | action of the joint cutting apparatus main body 500 are demonstrated.
6 and 7, the joint cutting device main body 500 includes a carriage unit 510, a traveling motor 520, a reclining plate 530, a first hydraulic cylinder 540, and a second joint forming unit 560.

The carriage unit 510 includes a pair of first vertical plate members 511 (FIG. 6) facing each other, a pair of second vertical plate members 512 (FIG. 7) facing each other, and an upper horizontal member 513. It is formed in a body shape (a rectangular parallelepiped with an open bottom).
In FIG. 6, the left end of the upper horizontal member 513 protrudes outward of one of the first vertical plate members 511.
A hinge member 513j is fixed to an end portion (left end in FIG. 6) of the upper horizontal member 513 that protrudes outward from the first vertical plate member 511. The hinge member 513j constitutes a hinge together with the hinge member 530j fixed to one end of the reclining plate 530 (the left end of the reclining plate 530 in FIG. 6).
In FIG. 6, an end 540 a of the first hydraulic cylinder 540 is attached to the upper surface near the left end of the upper horizontal member 513 by a hinge bracket 517 so as to be swingable.

6 and 7, a pair of first vertical plate members 511 facing each other on the outer surface (the outer surface in the left-right direction in FIG. 6; the front surface in the direction perpendicular to the paper in FIG. 7) An axle 515 (FIG. 7) is rotatably supported via a bearing 514. A pair of guide wheels 516 (FIG. 7) is fixed to both ends of the axle 515.
In the pair of guide wheels 516 and the pair of guide rails 20 shown in FIG. 7, each of the pair of guide wheels 516 is inserted into a groove in each of the pair of guide rails 20. In this state, the pair of guide wheels 516 and the pair of guide rails 20 guide the carriage unit 510 so as to travel along the guide rails 20.

6 and 7, for example, an inverter motor is used as the traveling motor 520. Then, the rotational force of the traveling motor 520 is transmitted to the gear box 520G via a clutch (not shown). The rotation of the traveling motor 520 is decelerated by the gear box 520G and transmitted to the traveling axle 521.
Two traveling wheels 522 are fixed to the traveling axle 521, and the two traveling wheels 522 are configured to travel on the flanges of the pair of rails 20.
Although not shown, the traveling motor 520 is controlled by the control unit 60.

When the carriage unit 510 is located at the lower part of the tunnel cross section as shown in FIG. 1, the weight of the carriage unit 510 acts in a direction in which the carriage unit 510 is pulled away from the guide rail 20.
Even in such a case (when the carriage unit 510 is located at the lower part of the tunnel cross section), the guide wheel 516 is inserted into the groove of the guide rail 20 as shown in FIG. It will not fall out of the rail 20.
However, in order to prevent the frictional force between the traveling wheel 522 and the rail 20 from being reduced and the traveling wheel 522 from spinning on the rail 20, the carriage unit 510 has the traveling wheel 522 on the guide rail 20. Biasing means (not shown) for crimping with a predetermined force is provided.

As shown in FIG. 7, in the first embodiment, the joint cutting device main body 500 is provided with a gear box 520G including a traveling motor 520 and a clutch in each of the pair of second vertical plate members 512.
However, in FIGS. 6 and 8, one second vertical plate member 512, a traveling motor 520, and a gear box 520G are shown.

As shown in FIG. 7, by providing two gearboxes 520G including a traveling motor 520 and a clutch, for example, in FIG. 6, when one traveling motor 520 is operated, the carriage unit 510 moves to the left, When only the other traveling motor 520 is operated, the carriage unit 510 is configured to move to the right. In such a configuration, when the carriage unit 510 is moved to the left, only one traveling motor 520 is operated, and the other traveling motor is not operated. In this case, by disengaging the clutch in the gear box 520G connected to the other traveling motor, the rotational force of the one traveling motor 520 in operation is not transmitted to the other traveling motor 520. .
Further, when moving the cart unit 510 to the right, if only the other traveling motor 520 is operated, the cart unit 510 moves to the right. At this time, if the clutch on one traveling motor side is disengaged, the rotational force of the other traveling motor 520 in operation is not transmitted to the one traveling motor side.
Note that it is also possible to use only one inverter motor capable of bidirectional rotation (forward / reverse rotation) and easy adjustment of the rotation speed as the traveling motor including the gear box.

In FIG. 6, the reclining plate 530 is configured by a flat plate having approximately the same size as the upper horizontal member 513.
As described above, the reclining plate 530 is provided with the hinge member 530j at the left end in FIG. 6 and forms a hinge together with the hinge member 513j of the upper horizontal member 513. Therefore, the reclining plate 530 is configured to be tiltable with respect to the carriage unit 510 (configured to be reclining) with the leftmost hinge member 530j (hinge formed by the hinge member 530j) as a rotation center.
Here, FIG. 6 shows a state where the reclining plate 530 is parallel to the upper horizontal member 513 (horizontal state: a state where the reclining plate is not reclining). FIG. 8 shows a state in which the reclining plate 530 is inclined with respect to the upper horizontal member 513 (the reclining state).

As shown in FIG. 8, a plurality of (for example, four) support members 531 are fixedly provided on the upper surface of the reclining plate 530.
The right support member 531 in the illustrated support member 531 forms a hinge portion of the link 533.
The right end of the link 533 is rotatably engaged with a clevis 542 at the tip of the piston rod 541 in the first hydraulic cylinder 540. The left end of the link 533 is pivotally supported with respect to the right support member 531 in FIG. The center of rotation at the left end of the link 533 is the center point of the right support member 531.

In FIG. 8, the first hydraulic cylinder 540 is moving in the contracting direction. In the state in which the first hydraulic cylinder 540 is most contracted, the reclining plate is inclined at the maximum angle with respect to the upper horizontal member 513 (the reclining plate is in the maximum reclining state).
On the other hand, in the state shown in FIG. 6, the first hydraulic cylinder 540 is most extended, and the reclining plate 530 is folded and parallel to the upper horizontal member 513 (not reclining). Yes.
However, in FIGS. 6 and 8, when the center of the support member 531 (the hinge portion of the link 533) is on the right side of the center of the clevis 542 (in FIGS. 6 and 8), the first hydraulic cylinder 540 is When extended, the reclining plate 530 is inclined (reclining) with respect to the upper horizontal member 513.
In other words, whether the reclining plate 530 is inclined (reclining) or not inclined (not reclining) with respect to the upper horizontal member 513, the expansion and contraction of the first hydraulic cylinder 540 are the hinge at the left end of the link 533, It differs depending on the positional relationship with the clevis 542 at the tip of the piston rod 541.

Next, the second joint forming portion 560 will be described with reference to FIG.
In FIG. 8, a joint forming portion mounting flat plate 534 is fixed above the support member 531.
A base plate 560 </ b> B is placed above the joint forming portion mounting flat plate 534.
The second joint forming portion 560 includes a cutter blade rotating mechanism 561 (see FIG. 7), a cutter blade 562, a side member 563, a second hydraulic cylinder 550, and a guide mechanism 570.
The cutter blade rotation mechanism 561 shown in FIG. 7 includes, for example, an electric motor (not shown) and a gear box for reduction. A speed reduction gear box (not shown) is configured to reduce the rotation of a motor (not shown) and transmit it to the cutter blade 562 (FIG. 8). Here, an electric motor (not shown) is controlled by a control unit 60 described later.
As shown in FIG. 7, the side member 563 is provided with a pair of left and right.

In FIG. 7, the pair of side members 563 are made of grooved steel having a U-shaped cross-sectional shape, and the open sides of the U-shaped cross-section are outside each other on the upper surface near the left and right ends of the base plate 560B (see FIG. 7). Then, it is arranged to face the left and right side.
A pair of second hydraulic cylinders 550 are disposed adjacent to the outer sides (left and right sides in FIG. 7) of the pair of side members 563.

In FIG. 6, a wire 553 is connected to the tip member 552 of the piston rod 551 of the second hydraulic cylinder 550.
The wire 553 is connected to a pair of swing arms 571B of the guide mechanism 570 via an idler pulley (not shown). When the second hydraulic cylinder 550 contracts, the swing arms 571A and 571B of the guide mechanism 570 are configured to rotate clockwise.

Here, instead of the wire 553, the piston rod 551 and the swing arm 571B can be connected by a rigid link.
The second hydraulic cylinder 550 can be replaced with a single-acting air cylinder with a built-in return spring.
Further, although not shown, when the first hydraulic cylinder 540 is contracted as shown in FIG. 8, the two guide rollers 572A and 572B of the guide mechanism 570 are fitted and brought into contact with the first joint Vc21. If the state as shown in FIG. 8 is surely performed, the second hydraulic cylinder 550 can be eliminated.

6 and 7, the guide mechanism 570 includes two pairs of swing arms 571A and 571B, a pair of guide rollers 572A and 572B, two pairs of stabilizers 573A and 573B, and a pair of shafts 574A and 574B. Yes.
The swing arm 571A and the swing arm 571B are configured to have the same specification, the guide roller 572A and the guide roller 572B have the same specification, and the stabilizer 573A and the stabilizer 573B have the same specification.
One end (lower end in FIG. 6) of the swing arm 571A and one end (upper end in FIG. 6) of the swing arm 571B are connected at an angle slightly smaller than 180 ° (a state close to a straight line).
A connection point between the swing arms 571A and 571B is a rotation center 571C of the swing arms 571A and 571B.

A shaft 574A and a shaft 574B (see FIG. 7: not shown in FIG. 6) are fixed to the other end (lower end in FIG. 6) of the swing arm 571A and the other end (upper end in FIG. 6) of the swing arm 571B. Has been.
Although not clearly shown, both ends of the shaft 574A are attached to the end portions (lower end in FIG. 6) of the pair of swing arms 571A, and the shafts are connected to the end portions (upper end in FIG. 6) of the pair of swing arms 571B. Both ends of 574B are attached.
In FIG. 7, a guide roller 572A is fixed at the center of the shaft 574A. Two stabilizers 573A and 573A are attached to both sides of the guide roller 572A so as to be rotatable around a shaft 574A.
In FIG. 8 (not clearly shown), a guide roller 572B is fixed at the center of the shaft 574B, and two stabilizers 573B and 573B are rotated around the shaft 574B on both sides of the guide roller 572B. It is attached movably.

6 to 8, reference numeral 575 indicates bearings of the swing arm 571A and the swing arm 571B.
6 and 8, the bearing 575 is disposed on the upper surface of the right end of the side member 563. The center of the bearing 575 is the center of rotation (the center of rotation) of the swing arm 571A and the swing arm 571B, and coincides with the center of the cutter blade 562.

FIG. 9 shows a first joint Vc21 formed in advance on the surface Fc2 of the secondary lining concrete C2, a guide roller 572A inserted into the first joint Vc21, a second joint Vc22, and a cutter. Blade 562 is shown.
Here, in FIG. 8, the distance (dimension) from the upper common tangent to the outer edge of the cutter blade 562 in the two guide rollers 572A and 572B is indicated by the symbol H.
Further, in FIG. 9, the depth from the front end portion (the upper end portion in FIG. 9) of the first joint Vc <b> 21 to the front end portion (the upper end portion in FIG. 9) of the second joint Vc <b> 22 is indicated by a symbol ΔR. Yes.
The dimension H in FIG. 8 and the depth ΔR in FIG. 9 are set approximately equal.

Next, with reference to FIG. 1 and FIGS. 6 to 11, a procedure for forming the induction joints (first joint and second joint) for causing cracks or cracks in the lining concrete will be described.
As shown in FIGS. 10 and 11, the secondary lining concrete C2 is placed inside the primary lining concrete C1 in the radial direction. When the secondary lining concrete C2 is placed, a defective portion having a wedge-shaped cross section, that is, a first joint Vc21 (see FIG. 9) is formed on the surface Fc2 of the secondary lining concrete C2.

When placing the secondary lining concrete C2, a dedicated formwork (not shown) is provided. The formwork for placing the secondary lining concrete C2 (not shown) is a known and existing equipment, but the surface thereof is complementary to the first joint Vc21 at an appropriate place for forming the induction joint. Protrusions (wedge shape) are provided.
By placing the secondary lining concrete C2 using such a mold, as shown in FIG. 11, the first joint Vc21 having a wedge-shaped cross section is formed on the surface Fc2 of the secondary lining concrete C2, as shown in FIG. Is formed.

Next, a pair of arc-shaped guide rails 20 are arranged in parallel in the space inside the secondary lining concrete C2 (on the inner periphery side of the tunnel). The guide rail 20 is placed in the tunnel while being fixed to the movable support frame 10 (see FIG. 1).
When the guide rail 20 is arranged, the control unit 60 operates the hydraulic jack 40, the feed base 42, and the electric motor 31 for fine position adjustment control in the longitudinal direction, vertical direction, and width direction in the tunnel of the guide rail 20. Alternatively, it is performed by an operator operating the hydraulic jack 40, the feed base 42, and the electric motor 31.

As shown in FIGS. 6 and 7, the joint cutting device main body 500 is disposed on the pair of guide rails 20.
As shown in FIG. 7, the guide wheel 516 of the carriage unit 510 is accommodated in the groove of the guide rail 20. As a result, the joint cutting device main body 500 can travel along the guide rail 20.
Then, by operating (contracting) the second hydraulic cylinder 550, the swing arm 571A and the swing arm 571 are rotated in the clockwise direction, and the guide roller 572A is moved to the first position as shown in FIG. Insert into the joint Vc21.
In this state, the first hydraulic cylinder 540 is actuated (contracted), the reclining plate 530 is inclined (reclining) with respect to the upper horizontal member 513, and the cutter blade 562 is rotated as shown in FIG. Then, the secondary lining concrete is cut.

Then, with the secondary lining concrete being cut by the cutter blade 562, the second hydraulic cylinder 550 is extended and the first hydraulic cylinder 540 is further contracted, whereby the swing arm 571A and the swing arm 571 are expanded. Rotates counterclockwise, and the guide roller 572A and the guide roller 572B are inserted into the first joint Vc21.
Here, when the guide roller 572A and the guide roller 572B are inserted into the first joint Vc21, the stabilizers 573A and 573B are also in contact with the secondary lining concrete C2 surface Fc2.

In this state, the second joint Vc22 is formed over the entire surface Fc2 of the secondary lining concrete C2 by the cutter blade 562 while moving the cart 510 along the guide rail 20. Here, since the pair of guide rollers 572A and 572B are arranged before and after the traveling direction of the cutter blade 562 (the direction of movement along the guide rail 20: the circumferential direction of the secondary lining concrete C2 surface Fc2), When cutting the second joint Vc22 on the secondary lining concrete C2 with the blade 562, the relative positions of the first joint Vc21, the guide rollers 572A and 572B, and the cutter blade 562 are always constant, and the longitudinal direction of the tunnel (induction It is possible to prevent displacement (so-called “shake”) in the joint width direction).
In addition, the stabilizers 573A and 573A are in line contact with the secondary lining concrete C2 surface Fc2 over a wide range in the joint width direction, and are prevented from shifting (blurring) in the joint width direction. The second joint Vc22 is accurately formed at the center of the first joint Vc21 and is quickly performed without the cutter blade 562 being displaced (blurring) in the joint width direction.
In the lining concrete, induction joints (first joint and second joint) for generating cracks or cracks are formed.

Here, since the relative positions of 572A and 572B and the cutter blade 562 are always constant, the angle formed by the guide rollers 572A and 572B cutter blade 562 is fixed to such an angle that the cutter blade 562 has a predetermined cutting depth.
As a result, when the guide rollers 572A and 572B come into contact with the first joint Vc21, the cutting depth of the cutter blade 562 is always constant regardless of the relative position to the inner peripheral surface of the secondary lining concrete C2. Become.

Next, in the placement work of the guide rail 20, the fine position adjustment control in the longitudinal direction, the vertical direction, and the width direction in the tunnel of the guide rail 20 will be described.
In the joint forming device 100 of the first embodiment, a flow rate control valve that controls the flow direction and flow rate of hydraulic pressure to the electric motor 31 of the longitudinal direction moving device 30 (see FIG. 3) and the hydraulic jack 40 (see FIG. 4). The control unit 60 (FIG. 12) for controlling 40V and the inverter motor 42M connected to the feed base 42 is provided.
Furthermore, as shown in FIG. 1, the joint forming device 100 of the first embodiment has one location (one cross section) for every predetermined traveling distance (longitudinal distance) on the surface of the secondary lining concrete C2 in the tunnel. In addition, position specifying members (markers) 7C are fixedly provided at a plurality of locations (five locations are illustrated in the first embodiment).
The operation panel 90 of the moving support frame 10 is equipped with a monitor 80 (see FIG. 12) as a display unit, and the laser pointer 7 has a plurality of locations on the guide rail 20 (the same number of locations as the marker 7: 5 in the illustrated example). Equipped).

FIG. 12 shows a detailed configuration of the control unit 60.
In FIG. 12, the control unit 60 includes a light receiving position deviation determination block 61, a guide rail / support frame current position determination block 62, a calculation control block 63, a tunnel longitudinal direction movement amount determination block 64, and a tunnel width direction movement amount. It has a determination block 65 and a tunnel vertical direction movement amount determination block 66.
The laser pointer 7 has a light emitting part 7A and a light receiving part 7B, and the laser beam irradiated from the light emitting part 7A is reflected by a fixed point (marker) previously recorded on the surface of the secondary lining concrete C2. Thus, the reflected light is detected by the light receiving unit.

The light receiving position deviation determination block 61 has a function of determining the deviation between the laser beam receiving position and the measured laser beam receiving position when the relative positional relationship between the guide rail and the secondary lining concrete C2 surface is appropriate. The laser pointer 7 is connected to the signal transmission line L7, and the arithmetic control block is connected to the signal transmission line L61.
The guide rail / support frame current position determination block 62 is connected to the calculation control block by a signal transmission line L62.
The arithmetic control block 63 is connected to the tunnel longitudinal direction movement amount determination block 64 by the signal transmission line L634, and is connected by the tunnel width direction movement amount determination block 65 and the signal transmission line L635, and communicates with the tunnel vertical direction movement amount determination block 66. Connected by line L636.

The tunnel longitudinal direction moving amount determination block 64 is connected to the electric motor 31 which is a longitudinal direction moving means and the signal transmission line L30, and is connected to the monitor 80 and the signal transmission line L64.
The tunnel width direction moving amount determination block 65 is connected by the electric motor 42M of the width direction moving means and the signal transmission line L42, and is connected by the monitor 80 and the signal transmission line L65.
The tunnel vertical movement amount determination block 66 is connected to the hydraulic control valve 40V of the vertical movement means and the signal transmission line L40, and is connected to the monitor 80 and the signal transmission line L66.

In the control unit 60 described above, the position information measured by the laser pointer 7 is transmitted to the light receiving position deviation determination block 61.
In the arithmetic control block 63, the position information, information on the current position of the movable support frame 10 determined by the guide rail / support frame current position determination block 62, the guide rail and the secondary determined by the light receiving position deviation determination block 61 are calculated. The relative position of the guide rail 20 with respect to the fixed point 7C of the movable support frame 10 is calculated from the deviation of the appropriate relative positional relationship on the surface of the lining concrete C2.

Based on the calculated relative position, the tunnel longitudinal direction movement amount determination block 64 calculates an appropriate amount to be moved in the longitudinal direction, and transmits the result as control command information to the electric motor 31 as the longitudinal direction moving means. To do. The electric motor 31 operates based on such information, and moves the guide rail 20 or the moving support frame 10 in the longitudinal direction.
Further, from the information related to the relative position of the guide rail 20 relative to the fixed point 7C of the moving support frame 10, the tunnel width direction movement amount determination block 65 calculates an appropriate amount to move in the width direction, and uses the result as control command information. And transmitted to the electric motor 42M which is the width direction moving means. The electric motor 42M operates based on such information, and moves the guide rail 20 or the moving support frame 10 in the width direction.
Further, from the information related to the relative position of the guide rail 20 with respect to the fixed point 7C of the movable support frame 10, the tunnel vertical direction movement amount determination block 66 calculates an appropriate amount to move in the vertical direction, and uses the result as control command information. Then, it is transmitted to the hydraulic control valve 40V which is a vertical movement means. The hydraulic control valve 40V is controlled to open and close based on such information, and the pressure oil circulation amount to the hydraulic jack 40 is adjusted to move the guide rail 20 or the movable support frame 10 in the vertical direction.

  Although not shown in FIG. 12, the calculation control block 63 of the control unit 60 also detects the position of the joint cutting device main body 500 with respect to the guide rail. If the joint cutting device main body 500 is deviated from the second joint construction (cutting) start position, a control command signal is transmitted to the traveling motor 520 of the joint cutting device main body 500 to produce the joint cutting device main body 500. Are arranged at appropriate positions.

Next, control of movement of the movable support frame 10 in the longitudinal direction, the width direction, and the vertical direction in the tunnel will be described with reference to FIG.
In step S <b> 1 of FIG. 13, the position of the moving support frame 10 in the tunnel is confirmed by the laser pointer 7.

In the next step S2, it is determined whether or not the position of the moving support frame 10 in the longitudinal direction is a normal position.
If the position in the longitudinal direction is not the normal position (NO in step S2), the process proceeds to step S3, the electric motor 31 is operated, and step S2 is repeated again. On the other hand, if it is a regular position (step S2 is YES), it will progress to step S4.
As a detailed control method when the position in the longitudinal direction is not the normal position, if the position in the longitudinal direction is closer to the face than the normal position, for example, the electric motor 31 is reversed (or rotated forward), The moving support frame 10 is returned to the wellhead side.
On the other hand, if the position in the longitudinal direction is closer to the wellhead than the normal position, the electric motor 31 is rotated forward (or reversed), for example, and the movable support frame 10 is advanced to the face side.

In step S4, it is determined whether or not the vertical position of the movable support frame 10 is a normal position.
If the vertical position is not the normal position (NO in step S4), the process proceeds to step S5, the control valve 40V is operated, and step S4 is repeated again. On the other hand, if it is a normal position (step S4 is YES), it will progress to step S6.
As a detailed control method in the case where the vertical position is not the normal position, if the vertical position is lower than the normal position, the flow of the hydraulic control valve 40V is switched in the direction in which the hydraulic jack 40 extends to apply pressure oil. Supply.
On the other hand, if the vertical position is higher than the normal position, the jack 40 can be lowered by a necessary amount by switching the flow path of the hydraulic control valve 40V and returning the oil of the hydraulic jack 40 by an appropriate amount by the return pipe. .

In step S6, it is determined whether or not the position in the width direction of the movable support frame 10 is a normal position.
If the position in the width direction is not the normal position (NO in step S6), the process proceeds to step S7, the electric motor 42M is operated, and step S6 is repeated again. On the other hand, if it is a normal position (step S6 is YES), it will progress to step S8.
As a detailed control method when the position in the width direction is not the normal position, if the position in the width direction is closer to the right side of the tunnel than the normal position, for example, the electric motor 42M is rotated forward (or reversed), for example. The moving support frame 10 is returned to an appropriate position.
On the other hand, if the position in the width direction is closer to the left side than the normal position, the electric motor 42M is reversely rotated (or rotated forward), for example, and the movable support frame 10 is returned to the proper position.

Here, steps S2 and S3, steps S4 and S5, and steps S6 and S7 may not be in the order shown in FIG.
Alternatively, steps S2 and S3, steps S4 and S5, and steps S6 and S7 can be executed simultaneously.

In the next step S8, it is determined whether or not the current position of the joint cutting device main body 500 is at the cutting start position.
If the current position of the joint cutting device main body 500 is not at the cutting start position (NO in step S8), the traveling motor 520 is operated to move the joint cutting device main body 500 to an appropriate position (return to the cutting start position). .
If the current position of the joint cutting device body 500 is at the cutting start position (YES in step S8), the process proceeds to step S10. Then, by operating (controlling) the first hydraulic cylinder 540 and the second hydraulic cylinder 550, the guide roller 572A is inserted into the first joint Vc21, the cutter blade 562 is rotated, and the first joint Vc21 is rotated. The secondary lining concrete C2 is cut from the center to form (cut) the second joint. At the same time, the guide roller 572B is inserted into the first joint Vc21, and the second joint Vc22 is cut in the circumferential direction of the surface Fc2 of the secondary lining concrete C2 while guiding the cutter blade 562 by the guide rollers 572A and 572B. To do.

Here, when one of the guide rollers 572A and 572B is inserted into the first joint Vc21, the secondary lining concrete C2 is cut by the cutter blade 562 to form the second joint Vc22, while the other A guide roller is inserted into the first joint Vc21.
When the guide rollers 572A and 572B are inserted into the first joint Vc21, the depth at which the secondary lining concrete C2 is cut by the cutter blade 562 (the cutting depth of the second joint Vc22) is kept constant. It is.

In step S11, it is determined whether or not the second joint Vc22 is formed over the entire circumferential direction of the secondary lining concrete C2 surface Fc2 (whether or not the induction joint is formed).
If the second joint Vc22 is not formed (NO in step S11), the process returns to step S10, and steps S10 and S11 are repeated.
If the second joint Vc22 is formed (YES in step S11), the guide rail 20 or the moving support frame 10 is moved to a position (cross section) where the next induction joint is to be formed, and steps S1 to S11 are performed again. Perform the following process.

According to the first embodiment, the cutter blade 562 is pushed into the first joint Vc21 formed in advance on the surface (the inner peripheral surface of the tunnel) Fc2 of the secondary lining concrete C2, and then deeply cut linearly. Thus, the second joint Vc22 can be formed.
And since the 2nd joint Vc22 which has deeply cut the secondary lining concrete C2 linearly is easy to produce stress concentration, a crack and a crack will occur from the 2nd joint Vc22 concerned, and crack and It can serve as a trigger joint to induce cracks.

According to the first embodiment, when the second joint Vc22 is cut in the secondary lining concrete C2, the guide rollers 572A and 572B are inserted into the first joint Vc21. Therefore, the relative positions of the first joint Vc21, the guide rollers 572A and 572B, and the cutter blade 562 are always constant, and the cutter blade 562 is prevented from being displaced (so-called “shake”) due to vibration during cutting. Thus, the position of the second joint Vc22 can be accurately cut.
In addition, in the first embodiment, when the guide roller 572A and the guide roller 572B are inserted into the first joint Vc21, the stabilizers 573A and 573B are also in contact with the secondary lining concrete C2 surface Fc2, Since the cutter blade 562 is prevented from being deviated in the width direction in the first joint Vc21, the position of the second joint Vc22 can be cut more accurately.

Further, according to the first embodiment, when the guide rail 20 is disposed, the measurement point is measured by the laser pointer 7, and the longitudinal direction, the vertical direction, The position of the guide rail 20 is adjusted in the width direction.
Therefore, the relative position between the secondary lining concrete C2 surface Fc2 and the guide rail 20 can always be kept constant. As a result, the relative position between the cutter blade 562 provided on the joint cutting device main body 500 moving on the guide rail 20 and the surface Fc2 of the secondary lining concrete C2 is always constant, and the position of the second joint Vc22 is accurately determined. Can be formed.

Next, a second embodiment of the present invention will be described with reference to FIGS.
The second embodiment of FIGS. 14 to 16 has a structure of a joint cutting device main body, in particular, a structure for inserting a guide roller and a cutter blade into the first joint, as compared with the first embodiment of FIGS. Is different.
14 to 16, members similar to those in the first embodiment in FIGS. 1 to 13 are denoted by the same reference numerals.
In FIG. 14, the joint cutting apparatus main body denoted by reference numeral 700 as a whole has a lower plate 734 disposed below the second joint forming portion 760, and an air cylinder 710 and a gas spring 720 below the lower plate 734. Is provided.
As shown in FIG. 15, a pair of air cylinders 710 are provided on the left and right (left and right direction in FIG. 15). The gas spring 720 is provided to alleviate an impact that occurs when the air cylinder 710 is expanded or contracted.

The air cylinder 710 is rotatably attached to the mounting bracket 730 by a bearing unit 712 provided at the lower end thereof. The gas spring 720 is rotatably attached to the mounting bracket 730 by a bearing unit 722 provided at the lower end thereof. The mounting bracket 730 is fixed to one of the first vertical plate members 511 (the first vertical plate member 511 on the left side in FIGS. 14 and 16) of the carriage unit 510.
The upper end of the air cylinder 710 is rotatably attached to the lower plate 734 by a bearing unit 714. The upper end of the gas spring 720 is rotatably attached to the lower plate 734 by a bearing unit 724.

In the first embodiment shown in FIGS. 1 to 13, the second joint molding part 560 is formed by contracting the first hydraulic cylinder 540 and inclining (reclining) the reclining plate 530 with respect to the upper horizontal member 513. The guide rollers 572A and 572B and the cutter blade 562 are inserted into the first joint Vc21 by inclining from the horizontal state of FIG. 7 to the state shown in FIG.
On the other hand, in the second embodiment of FIGS. 14 to 16, by extending the air cylinder 710 from the state shown in FIG. 14, the second joint forming part 760 rotates around the hinge 732, and the guide The side on which the rollers 572A and 572B and the cutter blade 562 are provided (the right side in FIGS. 14 and 16) is lifted.
As a result, the guide rollers 572A and 572B are inserted into the first joint Vc21, and the cutter blade 562 cuts the secondary lining concrete C2 to form the second joint Vc22.

Other configurations and operational effects in the second embodiment of FIGS. 14 to 16 are the same as those of the first embodiment of FIGS.
In FIG. 16, reference numerals 752 and 754 denote slide mechanisms. Although not clearly shown, the slide mechanisms 752 and 754 are provided with a mechanism that slides along an axis extending in a direction perpendicular to the paper surface in FIG. 14 and FIG. 16 (left and right direction in FIG. 15). Yes. The cutter blade 562 is configured to be movable (adjustable), for example, by 50 mm in a direction perpendicular to the paper surface in FIGS. 14 and 16 (left and right direction in FIG. 15) by the sliding mechanism.
Such a structure is common to the first embodiment shown in FIGS.

Next, a third embodiment of the present invention will be described with reference to FIGS.
17-20, the same code | symbol is attached | subjected to the member similar to FIGS. 14-16, and duplication description is abbreviate | omitted.
In the third embodiment shown in FIGS. 17 to 20, the joint cutting device body 800 inserts the guide rollers 572A and 572B and the cutter blade 562 into the first joint VC21 as in the second embodiment shown in FIGS. In order to do this, a pair of air cylinders 710 are provided below the lower plate 734.
Here, in the first embodiment and the second embodiment of FIGS. 1 to 16, the wire 553 is connected to the swing arm 571B, and the swing arm 571 is moved by extending and contracting the second hydraulic cylinder 550. It is rotating. In contrast, in the third embodiment of FIGS. 17 to 20, the swing arm 571 </ b> S is rotated by an arm rotation cylinder mechanism 810 instead of the wire 553 and the second hydraulic cylinder 550.

In FIG. 17, the joint cutting device body 800 is provided with a pair of air cylinders 710 (see FIG. 19), and the air cylinder 710 is provided with a speed controller 820. The speed controller 820 has a function of preventing an impact by suppressing the speed of expansion and contraction of the air cylinder 710.
In other words, in the second embodiment of FIGS. 14 to 16, the gas spring 720 is provided in order to mitigate the impact generated when the air cylinder 710 is expanded and contracted. On the other hand, in the third embodiment of FIGS. 17 to 20, instead of the gas spring 720, a speed controller 820 is provided to suppress the expansion and contraction speed of the air cylinder 710 to prevent an impact. Yes.

In FIG. 17, the second joint forming portion generally indicated by reference numeral 850 includes a cutter support portion 852, guide rollers 572 </ b> A and 572 </ b> B, and a cutter blade 562. Guide rollers 572A and 572B are connected by a swing arm 571S. The swing arm 571S is pivotally supported by the cutter support portion 852 at the rotation center 571C.
Here, in the embodiment of FIGS. 1 to 16, the swing arm is bent in a generally “<” shape, whereas in the third embodiment of FIGS. 17 to 20, the swing arm 571S is straight. It is composed of a rod.
The swing arm 571S is connected to one end of an arm turning cylinder mechanism 810 via a bracket 571BR.

The other end of the arm turning cylinder mechanism 810 is connected to the link plate 812.
The upper end of the link plate 812 is rotatably attached to the cutter support 852 by a pin 814, and the lower end of the link plate 812 is attached to the base plate 560B.
The base plate 560B is disposed below the cutter support portion 852, and a lower plate 734 is disposed below the base plate 560B.

In the base plate 560B, the region 560BF on the side to which the lower end of the link plate 812 is attached (the right side in FIG. 17) can move in the direction perpendicular to the paper surface of FIG. The region 560BF on the side (the right side in FIG. 17) to which the lower end of the link plate 812 of the base plate 560B is attached is configured to be rotatable about the pin 862 in a direction perpendicular to the paper surface of FIG. . Here, the code | symbol 864 has shown the slide bearing.
In FIG. 17, reference numeral 862 indicates a center position holding screw.

In FIG. 19 showing the arrow A in FIG. 17, reference numeral 866 denotes a protective roller for protecting the cutter blade 562.
In FIG. 20 showing the view of arrow B in FIG. 17, reference numeral 868 denotes a limit switch. The limit switch 868 has a function of detecting when the cutter blade 562 slides beyond the adjustment range (for example, 50 mm) by a mechanism that slides the cutter blade 562.

According to the third embodiment of FIGS. 17 to 20, when the air cylinder 710 is extended from the state shown in FIG. 17, the lower plate 734, the base plate 560 </ b> B, and the cutter support portion 852 are centered on the hinge 732. Rotate clockwise.
When the arm rotating cylinder mechanism 810 is expanded and contracted, the swing arm 571S rotates counterclockwise about the rotation center 571C.
As a result, as shown in FIG. 18, the guide rollers 572A and 572B and the cutter blade 562 enter the first joint Vc21, and the cutter blade 562 cuts the secondary lining concrete C2 to form the second joint Vc22. Form.
Other configurations and operational effects in the third embodiment of FIGS. 17 to 20 are the same as those of the second embodiment of FIGS.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Moving support frame 12 ... Vertical member 14 ... Horizontal member 15 ... Lower horizontal member 20 ... Guide rail 30 ... Longitudinal moving device 31 ... Electric motor 36 ... Wheel 40 ... hydraulic jack 40V ... hydraulic control valve 42 ... feed base 42M ... inverter motor 500 ... joint cutting device body 510 ... cart unit 520 ... travel motor 530 ... Reclining plate 540 ... first hydraulic cylinder 550 ... second hydraulic cylinder 560 ... second joint forming part 570 ... guide mechanisms 572A, 572B ... guide rollers 573A, 573B ... Stabilizers 574A, 574B ... shaft 710 ... air cylinder 810 ... arm rotating cylinder mechanism Fc2 ... secondary lining concrete surface Vc21 ... The first joint Vc22 ··· second joint

Claims (1)

Arranging arc-shaped guide rails at a certain distance from the surface of the secondary lining concrete in the space inside the secondary lining concrete;
A joint cutting device main body having a joint cutting member and a pair of guide rollers is disposed on the guide rail, and the pair of guide rollers is disposed in front of and behind the joint cutting member in the circumferential direction of the first joint. Inserting the joint cutting member into the first joint so that the joint cutting member is located in the center of the width direction of the first joint;
The joint cutting member is moved so that the joint cutting member cuts the center in the width direction of the first joint to a predetermined depth while moving the joint cutting apparatus body along the guide rail to form the second joint. A step of moving along the guide rail while being pushed into the first joint,
A method for forming joints for lining concrete, comprising:

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