JP3925833B2 - Waterproof sheet laying device and waterproof sheet laying method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof sheet laying device and a waterproof sheet laying method for laying a waterproof sheet on a segment outer peripheral surface in a shield method.
[0002]
[Prior art]
In the shield method, the face is cut by a shield machine, the jack for propulsion is extended from the reaction wall, the segment is installed in a ring shape in the space created by the shield machine, and the gap between the back of the segment and the ground It is a method of filling the back with a backing material.
Since this process is repeated many times and a new segment is joined to an existing segment, a seam is formed between the assembled segments, and groundwater enters. For this reason, a water-stop seal is attached to the segment to stop the water.
The groundwater intrusion from the natural ground is sealed by the sealing effect of the backing material, but it cannot be completely sealed due to deterioration of the backing material, and subsequent maintenance has been difficult.
[0003]
For this reason, a waterproof sheet is wound around the entire outer peripheral surface of the segment, and the segment and the ground are cut off, for example, a waterproof sheet laying method and a waterproof sheet laid down described in JP-A-7-217389 and JP-A-10-068299 A device has been proposed.
[0004]
When the waterproof sheet is laid by the above-described conventional waterproof sheet laying apparatus, the procedure is as follows.
<A> The newly installed waterproof sheet is joined to the existing waterproof sheet and overlapped, and is expanded in a cylindrical shape along the tail plate.
<B> Expand the newly wound waterproof sheet to a predetermined diameter. Or after expanding to a predetermined diameter, a part of waterproof sheet is fixed to a predetermined diameter.
<C> Adjust the winding length of the newly installed waterproof sheet to the wound length of the existing waterproof sheet, and adjust the wrap margin between the newly installed waterproof sheet and the existing waterproof sheet to a predetermined width.
<D> The welded portion of the waterproof sheet is thermally welded by a self-propelled welding machine or the like.
<E> As the segments are assembled and shields are dug, the waterproof sheets are successively added to lay the cylinders on the outer peripheral surface of the segments.
[0005]
[Problems to be solved by the present invention]
However, the above conventional techniques have the following problems.
<A> The waterproof sheet laid in the shield machine is flexible and easy to expand and contract, and unevenness and sagging are likely to occur. When unevenness (wrinkles) or stretching / sagging occurs in the existing waterproof sheet, it becomes extremely difficult to secure a uniform winding length and a predetermined wrap width, which requires a great deal of labor and time.
<B> Since the tension generated by wrinkles or sagging of the waterproof sheet joints interferes with the adhesion between the waterproof sheets, it is possible to ensure good bonding using a conventional self-propelled welding machine. It becomes difficult.
<C> When the waterproof sheet joining operation is performed simultaneously with the shield excavation and segment assembly, wrinkles and tension may be generated by the shield excavation and segment assembly, which adversely affects the welding operation of the joint portion of the waterproof sheet.
<D> Wrinkles and sagging of the waterproof sheet may cause the waterproof sheet to be pinched between the segment rings and break when performing segment assembly work. Therefore, the workability of laying the waterproof sheet is greatly reduced.
<E> With a conventional self-propelled welding machine, when joining in a narrow place such as in a shield machine, the structure must be small and compact, and the driving force is limited, so the welding speed is limited. The
Further, a conventional sandwiching type welder capable of self-running always requires a predetermined lapping margin. Therefore, it is necessary to secure or check a predetermined lapping margin before and during joining, and work efficiency is poor.
<F> Especially when laying waterproof sheets in large-diameter shield tunnels, the existing waterproof sheet joining technology takes time to lay the sheet, and even if it is performed simultaneously with segment assembly or shield tunneling, the waiting time is long. The problem of affecting the cycle time and delaying the construction period becomes serious.
[0006]
[Object of the present invention]
The present invention has been made to solve the above-described conventional problems, and a waterproof sheet laying device that can reliably prevent the waterproof sheet from hanging down during assembly of a segment and when a shield machine is advanced, and It aims at providing the laying method of a waterproof sheet.
In addition, when joining the joint portion of the existing waterproof sheet and the newly installed waterproof sheet, there is no need for human assistance like the conventional waterproof sheet joining device, and quick and automatic good joining can be performed. An object of the present invention is to provide a waterproof sheet laying device and a waterproof sheet laying method.
It is another object of the present invention to provide a waterproof sheet laying apparatus and a waterproof sheet laying method that can be constructed simultaneously with shield excavation and segment assembly and have good workability.
The present invention achieves at least one of these objects.
[0007]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a waterproof sheet laying device for laying a waterproof sheet on the outer peripheral surface of a segment, a cylindrical waterproof sheet receiving frame disposed along the inner periphery of the tail plate, A supporting frame that supports the tarpaulin receiving frame from the inside; a new tarpaulin fixing device that presses the new tarpaulin laid along the inner surface of the tarpaulin receiving frame against the tarpaulin receiving frame; and an already laid tarpaulin. A waterproof sheet laying device comprising: an existing waterproof sheet fixing device that presses against the waterproof sheet receiving frame. Here, the welding apparatus is characterized in that a welding device is provided that presses and welds a joint portion where a newly installed waterproof sheet and an existing waterproof sheet overlap each other to the waterproof sheet receiving frame.
The support frame is slidably attached to the tail plate of the shield machine through a jack.
Furthermore, it is also possible to press and weld the joint portion where both ends in the circumferential direction of the newly installed waterproof sheet overlap to the waterproof sheet receiving frame.
[0008]
Further, the present invention provides a waterproof sheet laying method using the waterproof sheet laying apparatus as described above, wherein the newly installed waterproof sheet is laid along the inner surface of the waterproof sheet receiving frame so as to overlap the edge of the existing waterproof sheet. Laying step, pressing the new waterproof sheet and the existing waterproof sheet laid in a cylindrical shape against the inner surface of the waterproof sheet receiving frame by the new waterproof sheet fixing device and the existing waterproof sheet fixing device, respectively, and the new waterproofing Tunnel excavation by sliding the support frame, which is performed in parallel with the welding process of welding the joining portion of the sheet and the existing waterproof sheet with a welding device, the laying process of the waterproof sheet, the pressing process and the welding process. And a step of assembling a segment. A waterproof sheet laying method comprising:
Here, it is also possible to press and weld the joint portion where both ends in the circumferential direction of the newly installed waterproof sheet overlap to the waterproof sheet receiving frame.
[0009]
[Embodiments of the Invention]
Embodiments of a waterproof sheet laying device according to the present invention will be described below with reference to the drawings.
[0010]
<A> Overall configuration of the device In the present invention, in order to efficiently lay the waterproof sheet in the tail plate of the shield machine, the waterproof sheet is fixed in a cylindrical shape at each stage of laying work, Use a waterproof sheet laying device to suppress / remove irregularities (wrinkles), sagging, and elongation caused by external force. An example of the overall configuration is shown in FIG.
The waterproof sheet laying device includes a cylindrical waterproof sheet receiving frame 2, a support frame 3, a newly installed waterproof sheet fixing device 4, an existing waterproof sheet fixing device 5, and a welding device 6.
Here, the support frame 3 is slidably attached to the tail plate 1 of the shield machine through a movable jack 9.
Hereinafter, each part is explained in full detail.
[0011]
<B> Waterproof Sheet Receiving Frame As shown in FIGS. 1 and 2, the waterproof sheet receiving frame 2 is formed from the vicinity of the joint 15 where the existing waterproof sheet 13 and the newly installed waterproof sheet 14 overlap along the inner surface of the tail plate 1. The new waterproof sheet 14 is disposed up to the face side end.
The inner diameter of the waterproof sheet receiving frame 2 is substantially the same as the outer diameter of the segment 12. Since the newly installed waterproof sheet 14 is stretched and fixed along the waterproof sheet receiving frame 2, it can always be wound with the same diameter.
[0012]
<C> Support frame The support frame 3 is a frame for supporting the waterproof sheet receiving frame 2 from the inside via a donut-shaped ring frame 10. This gantry is configured to receive a reaction force for fixing the waterproof sheet.
The support frame 3 is slidably supported by a cylindrical reinforcing frame 11. The reinforcing frame 11 is connected to the tail ring frame 1a.
The main body of the moving jack 9 is attached to the tail ring frame 1a. The tip of the movable jack 9 is connected to the support frame 3.
The support frame 3 can slide with respect to the tail plate 1 by the expansion and contraction of the movable jack 9.
The reinforcing frame 11 has a role of a slide guide and can be a rod shape.
[0013]
<D> New Waterproof Sheet Fixing Device The new waterproof sheet fixing device 4 is a device that presses the newly installed waterproof sheet 14 stretched along the inner surface of the waterproof sheet receiving frame 2, as shown in FIG.
The new waterproof sheet fixing device 4 has a plurality of presser jacks 4d attached to the outer surface of the support frame 3 in the circumferential direction, and connects the presser jacks 4d and the presser jack rolling prevention guide 4b to the waterproof sheet presser plate 4a. .
The waterproof sheet pressing plate 4a presses the newly installed waterproof sheet 14 against the waterproof sheet receiving frame 2 to prevent the waterproof sheet from drooping or extending.
The material of the pressing surface of the waterproof sheet pressing plate 4a is preferably a material that does not damage the waterproof sheet, for example, a material such as high-density nylon.
The newly installed waterproof sheet fixing device 4 is preferably capable of pressing and fixing almost the entire range of the newly installed waterproof sheet 14 so that uniform winding can be ensured at all times.
[0014]
<E> Existing Tarpaulin Fixing Device The existing tarpaulin fixing device 5 is a device that presses and fixes the existing tarpaulin 13 to the tarpaulin receiving frame 2 as shown in FIGS. 2 and 3.
The existing waterproof sheet fixing device 5 is similar to the new waterproof sheet device 4, and is configured by arranging a plurality of presser jacks 5 d on the outer surface of the support frame 3.
Further, similarly to the new waterproof sheet device 4, the waterproof sheet is disposed over the entire circumference of the existing waterproof sheet 13 in order to fix the waterproof sheet uniformly.
[0015]
<F> Welding device The welding device 6 is for welding a joining portion where the newly installed waterproof sheet and the existing waterproof sheet overlap. As shown in FIG. 4, the existing welding machine is improved to join the waterproof sheet. It is a device that enables high-speed construction.
The welding device 6 includes a turning ring 16 that is rotationally driven by a motor 20 via a pinion 21 and an internal gear, and a heating device 17 such as an electric heating iron and a pressing roller 18 are attached to the turning ring 16. To do.
[0016]
On the other hand, another welding device (not shown) (hereinafter referred to as an axial welding device) is arranged in the tail plate 1 in order to weld a joint portion where both ends in the circumferential direction of the newly installed waterproof sheet overlap.
The axial welding apparatus is configured by attaching a heating device such as a hot air discharge nozzle and a pressing device to a support base that is movable in the tunnel axial direction by driving means such as a motor.
The axial welding device is inserted between the joint portions where both ends in the circumferential direction of the newly installed waterproof sheet overlap, for example, a heating device such as a hot air discharge nozzle, while pressing the outer surface of the joint portion with a pressure roller, Heat welding is performed so as to be in close contact with the inner surface of the waterproof sheet receiving frame 2. And this welding is performed along a tunnel axial direction.
[0017]
<G> Winding device The winding device 7 is an existing device, which sandwiches the newly installed waterproof sheet 14 from the waterproof sheet roll 14a attached to the ring frame 10, and is rotationally driven by a motor via a pinion or an internal gear. This is a device that lays in a cylindrical shape on the inner surface of the waterproof sheet receiving frame 2 by means of a turning ring.
[0018]
In the present embodiment, the waterproof sheet laying device described above includes the waterproof sheet receiving frame 2, the newly installed waterproof sheet fixing device 4, the existing waterproof sheet fixing device 5, the welding device 6, and the winding device 7. By attaching all of the above devices to the support frame 3 and moving the support frame 3 in synchronization with the shield excavation, it is possible to perform the sheet laying operation simultaneously with the tunnel excavation operation.
Further, the movement of the support frame 3 enables fine adjustment of the width of the joint portion 15 between the existing waterproof sheet 13 and the newly installed waterproof sheet 14.
Further, since the waterproof sheet can be laid in the support frame 3, it is possible to lay the prevention sheet simultaneously with the segment assembly after the shield digging, and the feature of the present invention is that the waterproof sheet can be laid simultaneously in any work. is there.
[0019]
Next, a method for laying a waterproof sheet using the above-described waterproof sheet laying apparatus will be described.
[0020]
<A> Installation of waterproof sheet and fixed shield machine The shield jack 8 is pressed against the segment 12 in the excavation start state as shown in FIG.
The waterproof sheet is laid by pressing the existing waterproof sheet 13 on the inner surface of the waterproof sheet receiving frame 2 with the existing sheet fixing device 5 to affect the joint 15 that is welded by its own weight or external force, wrinkles, sagging, and external force. Do not reach.
In this state, the newly installed waterproof sheet 14 is laid along the inner surface of the waterproof sheet receiving frame 2 by the winding device 7 so as to overlap the edge of the existing waterproof sheet 13.
After laying, the new waterproof sheet 14 is pressed and fixed to the inner surface of the waterproof sheet receiving frame 2 by the new waterproof sheet fixing device 4 (FIG. 5).
[0021]
<B> The shield jack 8 is extended along with the progress of welding shield welding of the waterproof sheet. In order to synchronize with the extension of the shield jack 8, as shown in FIG. 5, the support frame 3 is maintained at a predetermined joining position by extending the moving jack 9.
At this time, since the newly installed waterproof sheet 14 and the existing waterproof sheet 13 are fixed together, the joint 15 can be welded without being affected at all by the weight of the waterproof sheet or by the shield digging.
In addition, the junction part where the both ends of the circumferential direction of a newly installed waterproof sheet overlap is welded with the said welding apparatus of an axial direction.
[0022]
<C> The holding jacks 4d and 5d of the segment assembly newly installed sheet fixing device 4 and the existing sheet fixing device 5 are pulled to release the fixing of the new waterproof sheet 14 and the existing waterproof sheet 13.
Thereafter, as shown in FIG. 6, the support frame 3 is slid by pulling the moving jack 9 forward.
After the support frame 3 is completely pulled, the existing waterproof sheet fixing device 5 is operated at the end of the face so that the newly installed waterproof sheet 14 laid down does not hang down due to its own weight. Press against the inner surface. In this state, the segment 12 is assembled.
[0023]
In order to newly lay the new waterproof sheet 14 after the segment assembly is completed, the new waterproof sheet roll 14a is set with the waterproof sheet fixed by the existing waterproof sheet fixing device 5 fixed as it is.
[0024]
As described above, since the waterproof sheet is fixed in each work process, unevenness (wrinkles), sagging, and elongation can be removed / suppressed, and it is possible to lay a uniform and high-quality waterproof sheet at all times. In particular, at the joint portion of the waterproof sheet, since both the newly installed and existing waterproof sheets are fixed, there is no influence of wrinkles, dripping, elongation, or the like.
[0025]
Further, when construction is performed simultaneously with tunnel excavation by shield excavation, the moving jack 9 is synchronized with the expansion and contraction of the shield jack 8 and the reinforcing frame 11 is slid with respect to the support frame 3. For this reason, it is possible to perform the laying work without being affected by the shield excavation.
Furthermore, when constructing at the same time as the segment assembly, the support frame 3 can be moved along with the shield excavation to secure a segment assembly space behind the excavation, so that the waterproof sheet laying operation and the segment assembly can be performed simultaneously. It becomes possible.
It should be noted that the fine adjustment of the width of the joint portion can be easily performed by moving the support frame 3 so as to secure the minimum predetermined lap margin by looking at the lap margin state of the existing waterproof sheet 13, so that it does not take time and effort.
[0026]
[Effect of the present invention]
Since the present invention has been described above, the following effects can be obtained.
<A> After laying the waterproof sheet in a cylindrical shape along the inner surface of the waterproof sheet receiving frame provided in the tail plate, the sheet is pressed and fixed with the waterproof sheet fixing device, so that -Wrinkles and sagging of the waterproof sheet during the excavation of the machine can be reliably prevented.
<B> Wrinkles and sagging of the waterproof sheet can be surely prevented, and by using the welding apparatus of the present invention, the pressure on the joined portion of the waterproof sheet laid in a cylindrical shape, the welding temperature and the welding speed are made constant. Since it can control, welding of the junction part of a waterproof sheet can be performed accurately.
<C> A waterproof sheet laying device (winding device, waterproof sheet fixing device, welding device) is mounted on a single support frame so that the waterproof sheet can be laid in the support frame. Synchronized with the shield excavation, it is possible to lay and weld the waterproof sheet in parallel with the cutting of the face, excavation work and segment assembly, so the work cycle time can be shortened and the workability is greatly improved To do.
<D> Since the waterproof sheet laying apparatus is unitized and systemized, installation and replacement of each laying work apparatus can be performed very easily, and the versatility of the apparatus is also increased.
<E> This tarpaulin laying method can perform a reliable laying work by arranging a new tarpaulin fixing device and an existing tarpaulin fixing device without synchronizing the excavation, winding and welding processes. it can.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an overall configuration of a waterproof sheet laying device according to the present invention. FIG. 2 is an enlarged view of a main part of FIG. 1. FIG. Cross-sectional view showing the right half of the cross-section [Fig. 4] Vertical cross-sectional view showing the main part of the welding device [Fig. 5] Vertical cross-sectional view showing the completion of digging and the installation of the new waterproof sheet in the waterproof sheet laying method [Fig. 6] Longitudinal sectional view showing completion of movement of support frame and start of assembly of segments in laying method of waterproof sheet [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tail plate 2 ... Waterproof sheet receiving frame 3 ... Support frame 4 ... Newly installed waterproof sheet fixing device 5 ... Existing waterproof sheet fixing device 6 ... Welding device 7 ... Winding Device 9 ··· Moving jack 12 ··· Segment 13 · · Existing waterproof sheet 14 · · New waterproof sheet 15 · · Joint

Claims (4)

In the waterproof sheet laying device for laying the waterproof sheet on the outer peripheral surface of the segment,
A cylindrical tarpaulin receiving frame disposed along the inner periphery of the tail plate;
A support frame for supporting the waterproof sheet receiving frame from the inside;
A new tarpaulin fixing device for pressing a new tarpaulin laid along the inner surface of the tarpaulin receiving frame against the tarpaulin receiving frame;
An existing tarpaulin fixing device that presses a tarpaulin already laid on the tarpaulin receiving frame, and
Tarpaulin laying device. In the laying apparatus of the waterproof sheet according to claim 1,
It is characterized in that a welding device is provided that presses and welds a joint portion where a newly installed waterproof sheet and an existing waterproof sheet overlap to the waterproof sheet receiving frame,
Tarpaulin laying device. In the waterproof sheet laying device according to claim 1 or 2,
The support frame is slidably attached to the tail plate of the shield machine through a jack.
Tarpaulin laying device. In the method of laying a waterproof sheet using the waterproof sheet laying device according to any one of claims 1 to 3,
A laying step of laying the newly installed waterproof sheet so as to overlap the edge of the existing waterproof sheet along the inner surface of the waterproof sheet receiving frame;
A pressing step of pressing the newly installed waterproof sheet and the existing waterproof sheet laid in a cylindrical shape against the inner surface of the sheet receiving frame by a newly installed waterproof sheet fixing device and an existing waterproof sheet fixing device, respectively.
A welding step of welding the joint portion of the newly installed waterproof sheet and the existing waterproof sheet with a welding device;
The step of performing the waterproof sheet laying step, the pressing step, and the welding step in parallel, the step comprising tunnel excavation and segment assembly by sliding the support frame,
How to lay a tarpaulin.

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