JPH0759879B2 - Impermeable membrane joining device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is intended to join a water impermeable film such as vinyl coated for waterproofing to the outer periphery of a lining segment of a tunnel constructed by a shield construction method. The present invention relates to a water impermeable membrane joining device.

[Prior Art] In recent years, it has been proposed to coat the outer circumference of a lining segment of a tunnel constructed by a shield construction method with a water impermeable film made of a polymer material such as vinyl for waterproofing (Practical application Sho 60). -97780, Jpn. App. No. 60-159771, etc.).

Regarding the coating of the impermeable membrane, the work of joining the impermeable membrane is involved, but regarding the joining device that joins this impermeable membrane,
This will be described with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, 1 is a shield machine, 2 is a shield frame of the shield machine 1, 3 is a shield jack, 4 is a tail seal, 5 is a segment, and 6 is an outer peripheral position of the segment 5. A water-permeable membrane laid on the surface of the segment 5 and a back-filling material injection device 7 for injecting a back-filling material 9 into a tail void formed between the water-impermeable membrane 6 and the ground 8. 6 is an injection port for injecting the backing material 9 between the outer circumference of the segment 6 and the outer circumference of the segment 5.

At the rear of the reinforcing ring frame 11 provided in the shield frame 2, that is, in the shield tail frame 2 ',
A ring-shaped rotary frame 14 provided with an internal gear 13 on the outer side surface and having a water impermeable film joining machine 12 attached at a required position on the inner side surface.
Is placed at a required distance in the axial direction from the ring frame 11, and the motor installed on the ring frame 11
A shaft 16 of 15 is guided to a rotary frame 14, a pinion 17 that meshes with the internal gear 13 is attached to the shaft 16, and a support frame 18 is provided on the rear surface side of the ring frame 11 so as to project therefrom. An appropriate number of guide rollers 19 are provided in the circumferential direction on the inner circumference of the rotating frame 14 to guide the rotating frame 14, and the rotating frame 14 is driven by the motor 15.
Is configured to rotate along the inner circumference of the shield tail frame 2 '. The joining machine 12 is urged by a required pressing force toward the inner wall of the shield tail frame 2'by a spring or the like. In the figure, 20 is a bearing for supporting the shaft 16, and 21 is a support frame projectingly provided on the rear surface side of the ring frame 11 so as to support the bearing 20.

Also, on the rear side of the ring frame 11, the support frame 23
A guide rail 24 projecting in the axial direction through the guide rail 24, a piece 26 having a water impermeable membrane joining machine 25 attached thereto is slidably engaged with the guide rail 24, and a threaded shaft 27 penetrates the piece 26. By screwing and driving the screw shaft 27 by the motor 22, the piece 26
The joining machine 25 is configured to be movable in the axial direction through the sliding of the.

In such a configuration, the ring frame 11 and the rotating frame
Between 14 and 14, an impermeable membrane 6'having a unit length slightly longer than the axial length of the segment 5 is formed as shown in FIG.
The water-impermeable membrane 6'is drawn out from a water-impermeable membrane storage container 28 in which the water-permeable membrane 6'is housed in a coil shape along the inner circumference of the shield tail frame 2'using a membrane winding device (not shown) and laid in a cylindrical shape. At this time, the impermeable membrane 6'is wrapped with the already impermeable membrane 6 in the axial direction (lap portion X), and the circumferential end portion is also wrapped (lap portion Y '). . In addition, when laying the impermeable membrane 6 ',
12 and 25 are clamped and separated from the surface of the impermeable membrane to be laid, and the lap portion X is located outside the joining machine 12 and the wrap portion Y is located outside the joining machine 25, respectively. There is.

When the motor 15 is driven in this state, the pinion 17
The rotary frame 14 rotates while being guided by the guide roller 19 through the meshing of the internal gear 13 with the internal gear 13, and this rotation is used to make the lap portion X between the impermeable membranes 6 ′ and 6 in the circumferential direction by the joining machine 12. Join across. On the other hand, when the motor 22 is driven, the piece 26 slides in the axial direction along the guide rail 24 by the rotation of the screw shaft 27, and the sliding of the piece 26 is used to move the lap portion Y ′ by the joining machine 25. It is designed to be joined. Wrap part X
When the joining of Y and Y is completed, the shield jack 3 is extended and the excavator 1 is moved forward, and the laying work and joining work of the water impermeable membrane 6 ′ are repeated in the same manner as described above, and during this time, the laying work has already been done. The assembling work of the segment 5 is performed in the impermeable membrane 6.

[Problems to be Solved by the Invention] However, in the water-impermeable membrane joining apparatus as described above,
As shown in the figure, the lap portion Y of the coated impermeable membrane 6 and the lap portion Y'of the impermeable membrane 6'to be newly laid are polymerized in the lap portion X to form the impermeable membranes 6, 6 '. Since a quadruple portion will be formed on the water impermeable membrane joining machine 12,25 that uses ultrasonic waves, it is extremely difficult to join more than three folds even if various conditions such as moving speed and pressing force are changed. Nearly impossible.

Further, the thicker the joint between the impermeable membranes 6 and 6'is locally thicker, the greater the pressing force of the impermeable membrane joining machine 12 and 25 and the larger the resistance, and the impermeable membranes 6 and 6 '. There was a problem that the risk of breakage also increased.

In view of the above situation, the present invention aims to provide a water impermeable membrane joining device that avoids concentration of a polymerized portion of the water impermeable membrane in one place and can more reliably weld the water impermeable membrane. is there.

[Means for Solving the Problems] According to the present invention, a ring-shaped rotating frame 14 is rotatably disposed in the shield frame 2 of the shield machine 1 so as to be concentric with the shield frame 2. An axial front end of a water impermeable film 6 laid by wrapping a circumferential end along the inner wall of the shield frame 2 and a circumferential end along the inner wall of the shield frame 2 Axial rear end of the impermeable membrane 6'which is laid so as to wrap and is laid so that the lap portion Y'is displaced without overlapping with the lap portion Y at the circumferential end portion of the water impermeable membrane 6. The water impermeable film joining machine 12 attached to the rotating frame 14 for joining the wrap portion X with
A piece 26 disposed axially movably along the inner wall of the shield frame 2, and a wrap portion Y whose tip is at the circumferential end of the impermeable membrane 6.
The wrap portion Y is arranged on the bridge 26 so as to be movable toward and away from the shield frame 2 so as to be movable in the radial direction of the shield frame 2 and at the circumferential end of the impermeable membrane 6. A possible impermeable membrane joining machine 25a, and the tip of the shield frame 2 to the piece 26 so as to be able to approach and separate from the wrap Y'at the circumferential end of the impermeable membrane 6 '. And a water impermeable film joining machine 25b which is arranged so as to be movable in the radial direction and is capable of joining the lap portion Y'at the circumferential end of the water impermeable film 6 '. is there.

[Operation] Lap portion Y'for overlapping circumferential end portions of the water impermeable membrane 6 '
Are located at a predetermined distance so as not to overlap the wrap portion Y of the covered impermeable membrane 6 already joined by the impermeable membrane joining machine 25a, and the inner side of the front end of the impermeable membrane 6 in the axial direction is described above. The wrap portion X is formed by superimposing the axial rear ends of the water impermeable membranes 6 ', and the wrap portion X is joined by rotating the rotating frame 14 by the water impermeable membrane joining machine 12 over the entire circumference. The tip of the joining machine 25a is separated from the inner surface of the water impermeable film 6 ', and the tip of the water impermeable film 25b is moved to the wrap portion Y'.
The lap portion Y'is joined by moving the piece 26 along the inner wall of the shield frame 2 in the axial direction while pressing it with a desired pressure.

When the coating and joining of the impermeable membrane 6'is completed, the shield machine 1 is advanced to perform the work of coating and joining the next impermeable membrane 6 again. The wrap portion Y of the water impermeable membrane 6 already covered at a required interval so as not to overlap the wrap portion Y'of the water impermeable membrane 6'which has already been coated.
While making the same level position with the water-permeable membrane joining machine 12 to join the entire circumference of the water-permeable membrane joining machine 25b, while the tip of the water-impermeable membrane joining machine 25b is separated from the inner surface of the next impermeable membrane 6, While pressing the tip of the water-permeable film joining machine 25a against the lap portion Y at the circumferential end of the next water-impermeable film 6 with a desired pressure,
The lap portion Y is joined.

As a result, the lap portion X at the axial end portion between the impermeable membranes 6 and 6 ′ does not have a quadruple portion even if a triple portion is formed, and the impermeable membranes 6 and 6 ′ are joined. Impermeable membrane
The breakage of 6,6 'is less likely to occur, and the impermeable membranes 6,6' can be joined more reliably.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the wrap portion Y ′ of the water impermeable membrane 6 ′ to be newly laid is displaced by a required distance from the wrap portion Y at the circumferential end of the water impermeable membrane 6 which has already been covered. The axially rear end of the impermeable membrane 6'is superposed on the axially front end of the impermeable membrane 6 from the inside to form the wrap portion X.

Along with this, as shown in FIG. 2, a piece 26 having a screw shaft 27 driven by a motor and threaded through it is slidably engaged with a guide rail 24 arranged in the axial direction (direction orthogonal to the paper surface). In the upper and lower surfaces of the piece 26, the guide rails 29a and 29b extending in the radial direction are respectively arranged, and the guide rails 29a and 29b are fitted with the impermeable membrane joining machines 25a and 25b, respectively. 30b
Is slidably engaged, and air cylinders 32a, 32b are mounted on the upper and lower parts of the bridge 26 via brackets 31a, 31b in the radial direction, and the rods 33 of the air cylinders 32a, 32b are attached.
a, 33b, the hanger 34a, the blocks 30a, 30b, respectively, at the tip.
The water impermeable membrane joining machine 25a is moved in the radial direction by the expansion and contraction of the air cylinder 32a so that the tip of the joining machine 25a can approach and separate from the lap portion Y, while the air cylinder 32b is connected. By the expansion and contraction, the impermeable membrane joining machine 25b moves in the radial direction so that the tip of the joining machine 25b can approach and separate from the lap portion Y '.

Since the water impermeable membrane 6'is pulled out from the water impermeable membrane storage container 28 and laid in a cylindrical shape along the inner circumference of the shield tail frame 2 ', the circumferential end of the water impermeable membrane 6'is constituted as described above. In the state in which the overlapping lap portion Y ′ is positioned below the lap portion Y of the covered impermeable membrane 6 already joined by the impermeable membrane joining machine 25a with a required gap, the impermeable membrane 6 The axially rear end of the water impermeable membrane 6'is superposed on the inner side of the axially front end to form a lap portion X.
The rotating frame (14) is rotated and the water impermeable film joining machine (12) joins the entire circumference.

On the other hand, by contracting the air cylinder 32a, the water impermeable film joining machine 25a
The tip of the water impermeable membrane 6'is separated from the inner surface of the water impermeable membrane 6'and the air cylinder 32b is extended, and the tip of the water impermeable membrane 25b is pressed against the lap portion Y'with a desired pressure, and the screw shaft 27 is rotated by a motor drive. The lap portion Y'is joined by sliding the piece 26 along the guide rail 24 forward in the axial direction.

When the coating and joining of the impermeable membrane 6'is completed, the shield jack 3 is extended and the shield machine 1 is advanced, and the next impermeable membrane 6 is coated and joined again. At this time, the lap portion Y at the circumferential end portion of the next impermeable membrane 6 is above the lap portion Y'of the impermeable membrane 6 '(which has already been covered) at a predetermined distance. The lap portion Y of the water-impermeable membrane 6 which has already been coated is positioned at the same level, and the entire circumference is joined by the water-impermeable membrane joining machine 12, while the tip of the water-impermeable membrane joining machine 25b is moved to the next position. While being separated from the inner surface of the impermeable membrane 6, the tip of the impermeable membrane joining machine 25a is pressed against the lap portion Y at the circumferential end of the next impermeable membrane 6 with a desired pressure, Join.

In this way, by sequentially covering and joining the impermeable membranes 6 and 6 ', the lap portions Y and Y'at the circumferential ends of the impermeable membranes 6 and 6'are arranged in a staggered pattern. Therefore, a triple layer is formed but a quadruple layer is not generated.
The 6'welding and joining can be reliably performed.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the present invention, the lap portions Y, Y'at the circumferential end portions of the respective water-impermeable membranes 6, 6'are mutually lapped at the axial end portions. Since it is possible to join the lap portions Y and Y'at the circumferential ends of the impermeable membranes 6 and 6'in order to avoid overlapping by X and not to form a quadruple portion, impermeable to water. Breakage at the time of joining the membranes 6 and 6'reduced, and the impermeable membranes 6 and 6 '
It is possible to obtain an excellent effect that the joining can be performed more reliably.

[Brief description of drawings]

FIG. 1 is an explanatory view of a water impermeable membrane joined by the water impermeable membrane joining apparatus of the present invention, and FIG. 2 shows a joining machine portion in the water impermeable membrane joining apparatus for joining the lap portion shown in FIG. Explanatory drawing, FIG. 3 is a side sectional view showing a conventional example, FIG. 4 is a view taken along the line IV-IV in FIG. 3, FIG. 5 is an explanatory view showing a procedure for laying a water impermeable membrane, and FIG. It is an explanatory view showing a wrapped state of the water impermeable membrane. 1 is a shield machine, 2 is a shield frame, 5 is a segment, 6 and 6'are water impermeable membranes, 12,25a and 25b are water impermeable film joining machines, 14 is a rotating frame, 26 is a piece, 28 is a water impermeable film The storage container, X, Y, Y'denotes wraps.

Claims (1)

[Claims] 1. A ring-shaped rotary frame (1) rotatably arranged in a shield frame (2) of a shield machine (1) so as to be concentric with the shield frame (2).
4), and the axial front end of the water impermeable membrane (6) laid with the circumferential ends wrapped so as to form a cylindrical shape along the inner wall of the shield frame (2), and the inner wall of the shield frame (2). The lap portion (Y ') does not overlap the lap portion (Y) at the circumferential end portion of the water impermeable membrane (6), which is laid so as to be cylindrical along the circumferential end portion. A water impermeable membrane joining machine (12) attached to the rotating frame (14) in order to join the wrap portion (X) with the axial rear end of the water impermeable membrane (6 ') laid so that A piece (26) arranged to be movable in the axial direction along the inner wall of the shield frame (2), and a tip of the piece (26) at a circumferential end of the impermeable membrane (6). The pieces (2
6), a water impermeable film that is arranged so as to be movable in the radial direction of the shield frame (2) and that can join the lap portion (Y) at the circumferential end of the water impermeable film (6). With respect to the joining machine (25a), the tip of the joining piece (26) can be moved toward and away from the lap portion (Y ') at the circumferential end of the impermeable membrane (6'). An impermeable membrane joining machine (25b) which is arranged so as to be movable in the radial direction of the shield frame (2) and is capable of joining the lap portion (Y ') at the circumferential end of the impermeable membrane (6'). ) And a water impermeable membrane joining device.