JP3970538B2 - Waterproof sheet joining device for tunnel machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof sheet joining apparatus in a tunnel excavator that joins an overlapping portion extending in the axial direction of a waterproof sheet wound in the tunnel excavator to be laid on the outer peripheral surface of a segment assembled by the tunnel excavator. is there.
[0002]
[Prior art]
The tunnel excavator obtains a reaction force through a shield jack on a segment assembled in the tunnel, and excavates while cutting a face with a cutter provided at the tip.
[0003]
Generally, the segments are assembled in a cylindrical shape. The segments are divided into predetermined dimensions in the axial direction and the circumferential direction, and are formed into a cylindrical shape by joining the segments.
[0004]
Therefore, a seam is made between the assembled segments, and groundwater enters, so that a water stop seal is provided between the segments to stop the water. However, in actuality, depending on the construction accuracy, there may be a case where an opening or a difference occurs, resulting in water leakage.
[0005]
For this reason, a backing material is provided on the outer peripheral side of the segment to enhance the sealing effect, but complete sealing cannot be performed due to deterioration of the backing material, and subsequent maintenance has been difficult.
[0006]
Therefore, in recent years, a method has been proposed in which a waterproof sheet is wound around the entire outer peripheral surface of the segment, and the segment and the ground are blocked to achieve waterproofing.
[0007]
The above-described waterproof sheet is laid in the following procedure.
[0008]
First, the newly installed waterproof sheet is overlapped with the existing waterproof sheet for the joint allowance, and is expanded in a cylindrical shape along the tail frame and the like. Then, the newly installed waterproof sheet is expanded to a predetermined diameter. The winding length of the newly installed waterproof sheet is adjusted to the winding length of the existing waterproof sheet, and the wrap margin between the newly installed waterproof sheet and the existing waterproof sheet is adjusted to a predetermined width. The joint portion of the waterproof sheet is thermally welded by a welding device.
[0009]
By repeating the above steps, the waterproof sheets are sequentially added and laid on the outer peripheral surface of the segment along with the assembly of the segment and the shield excavation.
[0010]
The above-mentioned waterproof sheet joining (welding) process is performed by wrapping the overlapping part of the newly formed waterproof sheet and the existing waterproof sheet formed in a circumferential shape and the circumferential ends of the newly formed waterproof sheet, and the shaft of the tunnel machine Applied to the overlapping portion formed linearly in the direction.
[0011]
In each of the above-described overlapping portions, the thickness is approximately twice the thickness of the waterproof sheet, but in the portion where the circumferential overlapping portion and the linear overlapping portion overlap, the thickness is the thickness of the waterproof sheet. Is approximately three times greater than
[0012]
By the way, when the linear overlapping portions of the adjacent waterproof sheets are formed on the same line, the two overlapping overlapping portions and the circumferential overlapping portion are overlapped, and the thickness is equal to the thickness of the waterproof sheet. There was a problem that the waterproof sheet was about four times larger and wrinkled.
[0013]
For this reason, as shown in FIG. 9, the circumferential overlapping positions 26 of adjacent waterproof sheets are arranged so as to be offset so that they do not overlap each other.
[0014]
In consideration of the joining work, these linear overlapping portions are alternately arranged on two straight lines separated by a distance that does not overlap each other, and one overlapping overlapping portion is arranged on the same line. It has become so.
[0015]
The conventional joining device for joining the linear overlapping portions has two welding devices respectively positioned on two straight lines in the axial direction of the tunnel machine, and these welding devices are movable in the radial direction. In other words, it is provided so as to be able to move freely in the axial direction while being provided close to and away from the waterproof sheet.
[0016]
When joining one superposed part, the other welding device was kept away from the waterproof sheet, and the whole joining device was moved in the axial direction while welding the superposed part with one welding device. .
[0017]
[Problems to be solved by the invention]
However, in the above-described joining device, since each welding device cannot move in the circumferential direction, when the linear overlapping portion of the waterproof sheet is displaced in the circumferential direction, the end portion of the waterproof sheet cannot be welded, and the sealing performance is deteriorated. There was a problem such as. Further, since two welding apparatuses are required, there is a problem that the manufacturing cost is high.
[0018]
Therefore, the present invention has been devised to solve the above problems, and its purpose is to join a waterproof sheet in a tunnel excavator that can reliably weld a linear overlapping portion at a circumferential end of the waterproof sheet. It is to provide the device at a low manufacturing cost.
[0019]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a tunnel machine that joins the overlapping portions extending in the axial direction of a waterproof sheet wound in the tunnel machine to be laid on the outer peripheral surface of a segment assembled by the tunnel machine. A waterproof sheet joining apparatus, comprising: a heating unit that heats the overlapping portion of the waterproof sheet; a pressing unit that presses the waterproof sheet heated by the heating unit; and a welding apparatus that includes the heating unit and the pressing unit. An axial movement means for moving in the axial direction of the tunnel machine and a circumferential movement means for moving the welding device in the circumferential direction of the tunnel machine , the pressing means being arranged along the inner circumference of the tail frame A waterproof sheet receiving frame that covers the waterproof sheet wound in a cylindrical shape from the outer periphery, and presses the waterproof sheet from the inner side to the outer side in the radial direction. Characterized in that comprising the e roller.
[0020]
According to the above configuration, by providing the circumferential direction moving means for moving the welding device in the circumferential direction of the tunnel machine, the welding device can be waterproofed even when the linear overlapping portion of the waterproof sheet is displaced in the circumferential direction. It is possible to match the position of the overlap portion, to cope with the positional shift of the overlapped portion, and to prevent deterioration of the sealing performance. In addition, since the pressing roller as the pressing means presses the overlapping portion against the inner peripheral surface of the waterproof sheet receiving frame, the linear overlapping portion at the circumferential end of the waterproof sheet can be reliably welded. Furthermore, since the overlapping portions of the waterproof sheets on two straight lines can be welded with one welding device, the device is simplified and the manufacturing cost is reduced.
[0022]
Further, it is preferable that the presser roller is supported by a spherical bearing and rotates along the surface of the waterproof sheet receiving frame.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
[0024]
FIG. 1 is a plan view showing a preferred embodiment of a waterproof sheet joining apparatus for a tunnel machine according to the present invention, and FIG. 2 is a preferred embodiment of a waterproof sheet joining apparatus for a tunnel machine according to the present invention. 3 is a sectional view taken along the line AA in FIG. 2, FIG. 4 is a sectional view taken along the line BB in FIG. 2, and a side view showing the nozzle, and FIG. 5 is a sectional view showing the press roller and the bearing. 6 is a schematic cross-sectional view showing a waterproof sheet laying device, FIG. 7 is an enlarged cross-sectional view of FIG. 6, FIG. 8 is a cross-sectional view taken along lines CC and DD of FIG. It is the perspective view which showed the winding-up state.
[0025]
First, the overall configuration of a laying apparatus for laying a waterproof sheet on the outer peripheral surface of a segment will be described.
[0026]
As shown in FIGS. 6 to 8, the laying device 2 for the waterproof sheet 1 is disposed in the tail frame 4 at the rear of the tunnel digging machine 3, and before the segment 5 is assembled, the waterproof sheet 1 is formed in a cylindrical shape. It is something to keep.
[0027]
The laying device 2 includes a cylindrical waterproof sheet receiving frame 6, a support frame 7, a new waterproof sheet fixing device 8, an existing waterproof sheet fixing device 9, a winding device 10, and a joining device 11. It is configured.
[0028]
The waterproof sheet receiving frame 6 is arranged along the inner peripheral surface of the tail frame 4 with a slight gap from the inner peripheral surface, and a superposed portion (joint portion) where the existing waterproof sheet 1a and the newly installed waterproof sheet 1b overlap. ) It extends from the vicinity of 25 to the face side end of the newly-installed waterproof sheet 1b. The inner diameter of the waterproof sheet receiving frame 6 is substantially the same as the outer diameter of the assembled segment 5. Since the newly installed waterproof sheet 1b is stretched and fixed along the waterproof sheet receiving frame 6, it can always be wound up with the same diameter.
[0029]
The support frame 7 is a pedestal for supporting the waterproof sheet receiving frame 6 from the inside via a donut-shaped ring frame 14. This gantry is configured to receive a reaction force for fixing the waterproof sheet 1. The support frame 7 is slidably supported by a cylindrical reinforcing frame 15. The reinforcing frame 15 is connected and fixed to a tail ring frame 16 extending from the inner peripheral surface of the tail frame 4.
[0030]
A moving jack 17 is connected to the tail ring frame 16. The distal end of the movable jack 17 is connected to the support frame 7, and the support frame 7 slides in the axial direction of the tunnel excavator 3 by the expansion and contraction of the movable jack 17. The reinforcing frame 15 has a role of a slide guide and may be rod-shaped.
[0031]
The newly installed waterproof sheet fixing device 8 presses the newly installed waterproof sheet 1b extended along the inner peripheral surface of the waterproof sheet receiving frame 6 radially outward. In the newly installed waterproof sheet fixing device 8, a plurality of presser jacks 18 are provided on the outer surface of the support frame 7 at predetermined intervals in the circumferential direction. A waterproof sheet presser plate 19 is provided at the tip of the presser jack 18. Rolling prevention guides 21 for preventing the presser jack 18 from rolling are provided on both sides of the presser jack 18 (see a cross-sectional view taken along the line CC in FIG. 8). A material such as high-density nylon is used for the holding surface of the waterproof sheet holding plate 19 so as not to damage the waterproof sheet 1.
[0032]
As the presser jack 18 extends, the waterproof sheet pressing plate 19 presses the newly installed waterproof sheet 1b against the waterproof sheet receiving frame 6 to prevent the waterproof sheet 1 from dripping or extending. The newly installed waterproof sheet fixing device 8 is preferably capable of pressing and fixing almost the entire range of the newly installed waterproof sheet 1b so as to always ensure uniform winding of the waterproof sheet 1.
[0033]
The existing waterproof sheet fixing device 9 presses and fixes the existing waterproof sheet 1a to the waterproof sheet receiving frame 6. Similarly to the newly installed waterproof sheet fixing device 8, the existing waterproof sheet fixing device 9 is also provided in plural on the outer surface of the support frame 7 at predetermined intervals over the entire circumference, and includes a press jack 22, a waterproof sheet press plate. 23 and a rolling prevention guide 24 (refer to the cross-sectional view along the line DD shown on the right side in FIG. 8).
[0034]
The winding device 10 sandwiches the newly installed waterproof sheet 1b from the waterproof sheet roll 33 attached to the ring frame 14, rotates along the inner periphery of the waterproof sheet receiving frame 6, and lays the waterproof sheet 1 in a cylindrical shape. To do. The winding device 10 is attached to a turning ring (not shown) that is rotationally driven by a drive source such as an electric motor via a pinion and an internal gear.
[0035]
The joining device 11 includes a circumferential joining device 11a that joins the circumferential overlapping portion 25 of the newly installed waterproof sheet 1b and the existing waterproof sheet 1a formed in a circumferential shape, and both ends in the circumferential direction of the newly installed waterproof sheet 1b are wrapped. And an axial joining device 11b for joining the linear overlapping portions 26.
[0036]
The circumferential joining device 11a includes a turning ring 29 that is rotationally driven by a motor 27 via a pinion 28 and an internal gear (not shown). The turning ring 29 includes a heating means 31 such as an electric heating iron and the like. A pressing means 32 for pressing the waterproof sheet 1 heated by the heating means 31 is provided and configured.
[0037]
Incidentally, in the present invention, as shown in FIGS. 1 to 4, the joining device 11b for joining the waterproof sheet 1 in the axial direction heats the overlapping portion 26 of the waterproof sheet 1b, and the heating means 34. A pressing means 35 for pressing the waterproof sheet 1 heated by the above, an axial movement means 37 for moving the welding means 36 provided with the heating means 34 and the pressing means 35 in the axial direction of the tunnel machine 3, and a welding apparatus 36. Is provided with a circumferential movement means 38 for moving the machine in the circumferential direction of the tunnel excavator 3.
[0038]
The joining devices 11b are arranged between a plurality of shield jacks 39 arranged at predetermined intervals in the circumferential direction along the inner circumference of the tunnel excavator 3.
[0039]
The welding device 36 is provided with a heating means 34 and a pressing means 35 movably in the radial direction of the tunnel excavator 3 via an extension jack 41 or the like. In the present embodiment, the heating means 34 employs a hot air blowing type, and hot air heated by a heater (not shown) is blown to the superposition unit 26 via the nozzle 43. It should be noted that other means such as a thermal iron may be used as the heating means.
[0040]
A pressing roller 45 constituting the pressing means 35 is provided adjacent to the hot air outlet 44 of the nozzle 43. The presser roller 45 rotates while pressing the overlapping portion 26 of the waterproof sheet 1 toward the inner peripheral surface of the waterproof sheet receiving frame 6 through the telescopic jack 41 with an appropriate pressure.
[0041]
The nozzle 43 and the presser roller 45 are arranged so as to overlap with the end portion in the circumferential direction of the waterproof sheet 1 on the inner side, and the end portions are reliably welded (see FIG. 4B).
[0042]
As shown in FIG. 5, the pressing roller 45 is pivotally supported via a spherical bearing 53, and rotates in the axial direction along the inner peripheral surface of the waterproof sheet receiving frame 6.
[0043]
As the axial movement means 37, a ball screw 46 and a guide rod (not shown) extending in the axial direction of the tunnel excavator 3 are provided on the upper part of the welding device 36. The ball screw 46 and the guide rod are arranged parallel to each other and extending in the axial direction, and both ends thereof are supported by the support plate 47. A motor 49 that rotates the ball screw 46 via a chain 48 is attached to the support plate 47. A bracket 51 having a screw hole into which the ball screw 46 is screwed and a through hole through which the guide rod passes is attached to the upper portion of the welding device 36.
[0044]
By rotating the ball screw 46 by the motor 49, the welding device 36 moves in the axial direction. The direction of movement of the welding device 36 during welding proceeds from the rear of the tunnel excavator 3 to the front face side. As a result, the waterproof sheet 1 is welded in the axial direction from the existing waterproof sheet 1a toward the front side where the end is free, and the waterproof sheet 1 is less likely to be wrinkled.
[0045]
In the vicinity of the support plate 47, a guide rail 52 extending in the circumferential direction of the tunneling machine 3 is provided orthogonal to the support plate 47. The guide rail 52 has a length slightly longer than the distance between the two rows of linear overlapping portions 26 shown in FIG. The guide rail 52 movably supports the support plate 47 via a bracket 54 extending from the support plate 47.
[0046]
On the fixed side of the support frame 7 or the like, a moving means (not shown) such as an expansion / contraction jack for moving the support plate 47 in the circumferential direction is provided.
[0047]
Next, according to the laying process of the waterproof sheet 1, the operation of the waterproof sheet joining apparatus in the tunnel digging machine having the above configuration will be described.
[0048]
The tunnel excavator 3 keeps the shield jack 39 pressed against the segment 5 in the excavation start state. The existing waterproof sheet 1a is pressed and fixed to the inner peripheral surface of the waterproof sheet receiving frame 6 by the existing waterproof sheet fixing device 9 so that the circumferential overlapping portion 25 is not affected by wrinkles, sagging or external force due to its own weight or external force. Keep it.
[0049]
Then, the newly installed waterproof sheet 1b is laid along the inner peripheral surface of the waterproof sheet receiving frame 6 by the winding device 10 so as to overlap the edge of the existing waterproof sheet 1a. Thereafter, the new waterproof sheet 1 b is pressed and fixed to the inner peripheral surface of the waterproof sheet receiving frame 2 by the new waterproof sheet fixing device 8.
[0050]
Next, the waterproof sheet 1 is welded. As the tunnel excavator 3 digs up, the shield jack 39 extends. In synchronization with the extension, the moving jack 17 is extended to maintain the support frame 7 at a predetermined joining position.
[0051]
And the circumferential superposition | polymerization part 25 of the newly installed waterproof sheet 1b and the existing waterproof sheet 1a is joined by the circumferential direction joining apparatus 11a.
[0052]
At this time, since the newly installed waterproof sheet 1b and the existing waterproof sheet 1a are fixed together, the overlapping portion 25 can perform a stable welding operation without being affected at all by the weight of the waterproof sheet 1 or by shield digging. .
[0053]
Next, the linear overlapping portion 26 formed by wrapping both ends in the circumferential direction of the newly installed waterproof sheet 1b is joined by the axial joining device 11b according to the present invention. Hereinafter, the joining of the linear overlapping portion 26 will be described in detail.
[0054]
As shown in FIG. 9, the linear overlapping portions 26 of the waterproof sheets 1 adjacent to each other in the axial direction are arranged with their circumferential positions offset so as not to overlap each other. These linear overlapping portions 26 are alternately arranged on two straight lines separated by a distance where the overlapping portions 26 do not overlap each other, and one overlapping overlapping portion 26 is arranged on the same line. Yes.
[0055]
First, the welding device 36 is moved by the circumferential movement means 38 so that the nozzle 43 and the pressing roller 45 of the welding device 36 are positioned in the linear overlapping portion 26 to be joined. At the same time, the welding device 36 is moved by the axial movement device 37 so that the welding device 36 is positioned at the rear end of the linear overlapping portion 26.
[0056]
And the welding apparatus 36 is moved ahead along an axial direction, fixing to the circumferential direction. At this time, hot hot air is blown from the hot air outlet 44 of the nozzle 43 to melt the linear overlapping portion 26 of the newly-installed waterproof sheet 1b and press the melted overlapping portion 26 with the pressing roller 45 to form a straight line. The polymerized portion 26 is welded.
[0057]
Since the pressing roller 45 presses the overlapping portion 26 of the waterproof sheet 1 b against the inner peripheral surface of the waterproof sheet receiving frame 6, pressure is uniformly applied to the welded portion of the linear overlapping portion 26, and the overlapping portion 26. Can be reliably welded, and an improvement in sealing performance is achieved.
[0058]
Further, since the pressing roller 45 is pivotally supported via the spherical bearing 53, even if the inner peripheral surface of the waterproof sheet receiving frame 6 has a wave or the like, it can be rotated along the surface. Further, the welding of the overlapping portion 26 can be further ensured.
[0059]
Further, in the present invention, by providing the circumferential direction moving means 38 for moving the welding device 36 in the circumferential direction of the tunnel machine 3, the superposition is alternately offset on the two straight lines. The welding of the part 26 can be performed by one welding apparatus 36, the joining apparatus 11 is simplified, and the manufacturing cost can be reduced.
[0060]
Moreover, even if the position of the linear overlapping portion 26 of the waterproof sheet 1b is shifted in the circumferential direction, the welding device 36 can be aligned with the overlapping portion 26, and the deterioration of the sealing performance can be prevented. Since the guide rail 52 is formed slightly longer than the distance between the two linear overlapping portions 26, it is possible to cope with the case where the linear overlapping portion 26 is displaced outside the normal position. .
[0061]
【The invention's effect】
In short, according to the present invention, by providing the circumferential direction moving means for moving the welding apparatus in the circumferential direction of the tunnel machine, it is possible to cope with the positional deviation of the overlapping portion, and the pressing roller as the pressing means Since the superposed portion is pressed against the inner peripheral surface of the waterproof sheet receiving frame, an excellent effect that the linear superposed portion at the circumferential end of the waterproof sheet can be surely welded is exhibited. Further, since the overlapping portions arranged alternately on the two straight lines can be welded by one welding device, the joining device is simplified and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view showing a preferred embodiment of a waterproof sheet joining apparatus for a tunnel machine according to the present invention.
FIG. 2 is a side view showing a preferred embodiment of a waterproof sheet joining apparatus for a tunnel machine according to the present invention.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4A is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 4B is a side view showing the nozzle.
FIG. 5 is a cross-sectional view showing a roller and a bearing.
FIG. 6 is a schematic cross-sectional view showing a waterproof sheet laying device.
FIG. 7 is an enlarged cross-sectional view of FIG.
8 is a cross-sectional view taken along a line CC and a cross-sectional view taken along a line DD in FIG. 6;
FIG. 9 is a perspective view showing a wound state of the waterproof sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Waterproof sheet 3 Tunnel machine 4 Tail frame 5 Segment 6 Waterproof sheet receiving frame 11 Joining device 26 Superposition part 34 Heating means 35 Pressing means 36 Welding apparatus 37 Axial direction moving means 38 Circumferential direction moving means 45 Pressing roller 53 Spherical bearing

Claims (2)

A waterproof sheet joining apparatus in a tunnel machine for joining an overlapping portion extending in the axial direction of a waterproof sheet wound in the tunnel machine to be laid on the outer peripheral surface of a segment assembled by the tunnel machine, the waterproof sheet A heating means for heating the superposed portion, a pressing means for pressing the waterproof sheet heated by the heating means, and an axial movement for moving the welding device provided with the heating means and the pressing means in the axial direction of the tunnel machine Means and a circumferential direction moving means for moving the welding device in the circumferential direction of the tunnel machine, and the pressing means is disposed along the inner periphery of the tail frame and winds the waterproof sheet wound up in a cylindrical shape. to a tarpaulin support frame covering the outer periphery thereof, characterized by comprising a waterproof sheet and a pressing roller for pressing from the inside outward in the radial direction Bonding apparatus of the waterproof sheet in tunnel excavator. The apparatus for joining waterproof sheets in a tunnel machine according to claim 1 , wherein the pressing roller is supported by a spherical bearing and rotates along the surface of the waterproof sheet receiving frame .

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