JPH0481039B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention covers the outer periphery of the lining segment of a tunnel constructed by the shield construction method with an impermeable membrane such as vinyl for waterproofing, or The present invention relates to an impermeable membrane coating method and apparatus for coating the outer periphery of a structure with an impermeable membrane.

[Conventional technology] Taking the shield construction method as an example, the current shield construction method excavates a tunnel face with a cutter at the front end of a shield excavator, and while holding the face, shield excavation is carried out by the thrust of a shield jack at the rear. The lining is completed by assembling the segments at the rear of the machine, and backfill material is injected into the gap between the lining and the surrounding ground to fill it, but during or after construction, the segment Water often leaks into the tunnel through joints or cracks. For this reason, water leakage prevention work has traditionally been required at the time of or after the completion of shielding work, and if groundwater overflows into the void between the segment and the ground, the injection of backfilling material into the tail void may be interrupted by groundwater. Problems such as dilution may occur.

In order to solve this problem, recently, an impermeable membrane made of vinyl, polyethylene, etc. is placed in the gap between the segment and the ground as the shield excavator moves, covering the entire circumference of the segment. things are being done.

If the entire circumference of the segment is covered with an impermeable membrane and a backing material is filled between the impermeable membrane and the segment, the impermeable membrane prevents groundwater from reaching the outer surface of the segment and prevents the joint of the segment. The problems mentioned above, such as water leakage from the parts, will no longer occur.

A conventional device for covering the outer periphery of a segment with an impermeable film such as vinyl is a shield frame a of a shield excavator, as shown in FIGS. 5 and 6.
A cylindrical impermeable membrane c is folded and stored in the impermeable membrane storage part b on the circumference, as shown in FIG. The impermeable membrane c can be pulled out in a cylindrical shape from the rear end of b along the inner surface of the shield frame a, and as the shield moves forward, the impermeable membrane c is made to be impermeable in the gap (tail void) f between the segment d and the ground e. Membrane c is pulled out to cover the entire circumference of segment d. In the figure, g is a tail seal, h is a shield jack, i is a cutter frame, j is a cutter drive device, k is an erector telescopic jack, l is a mud feeding pipe, and m is a mud draining pipe.

[Problems to be Solved by the Invention] However, the impermeable membrane c used in the shield construction method must be manufactured into a cylindrical shape before storage;
When folding this cylindrical impermeable membrane c so as to compress it in the axial direction, it cannot be folded into a lantern shape, but must be folded into a polygonal shape when viewed in the axial direction as shown in Figure 7. There are many problems, such as the inability to fold.

Since the impermeable membrane c is made in advance into a cylindrical shape and then stored in the impermeable membrane storage part b, it is necessary to make the required length of the cylinder each time to match the diameter and length of the location where the impermeable membrane is installed. It takes a lot of effort to make one that corresponds to a variety of sizes.

In the case of a tunnel, the length is approximately 1 km, which makes it difficult to fold the water-impermeable membrane cylinder so that it can be stored in the storage area.

When the cylindrical impermeable membrane c is folded, the seventh
As shown in the figure, since it is folded into a polygonal shape, the thickness n of the water-impermeable membrane housing portion b in the inner and outer directions increases accordingly.

As the diameter of the shield frame a increases, the diameter of the cylindrical impermeable membrane c also increases accordingly, making it difficult to fold this large diameter impermeable membrane when storing it in the storage part b. it takes time.

As mentioned above, in the case of a cylindrical impermeable membrane to cover the outer periphery of a segment using the shield method,
Although there are various problems, in the case of impermeable membranes used to cover the outer periphery of structures such as caissons other than tunnel lining using the shield method, there are some made in rectangular tubes other than cylindrical shapes, but segment For example, it is difficult to create a cylindrical impermeable membrane that matches the shape and size of the structure along the outer circumference of the structure, such as a caisson or a caisson. Water-permeable membranes also have the same problems as above.

In addition, conventionally, there are membranes that extend as structures such as caissons advance, but these membranes are not water-impermeable membranes and are designed to extend around the structure in order to help the structure advance. It is intended to reduce the frictional force of water, and is not suitable for applications aimed at preventing water leakage into structures.

According to the present invention, the impermeable membrane can be easily stored in the storage part without increasing the thickness of the storage part,
Furthermore, we provide an impermeable membrane coating method and device that does not take much time to manufacture even if it is long, and that when coating the outer periphery of a structure, it becomes cylindrical and prevents water from leaking into the structure. This is what I am trying to do.

[Means for Solving the Problems] The present invention provides an impermeable membrane that extends along the outer periphery of a structure to be coated into strips divided in the circumferential direction, and an impermeable membrane storage section for each impermeable membrane band. When the impermeable membrane band is fed out from the impermeable membrane storing portion to the outer periphery of the structure, the edges of adjacent impermeable membrane bands are joined to form a cylindrical shape to cover the structure.

[Function] The impermeable membranes are stored in strips, and when each impermeable membrane strip is unwound from each storage section, the impermeable membrane strips that are adjacent to each other in the circumferential direction are joined together. . As a result, the water-impermeable membrane becomes cylindrical when coated on the outer periphery of the structure, thereby preventing water from leaking into the structure. Also, when storing in each storage section,
Since each impermeable membrane band is folded, it is easy to fold and store.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1 to 4 show a case where an embodiment of the present invention is applied to cover the outer periphery of a tunnel lining segment in a shield construction method with an impermeable membrane.

An impermeable membrane storage box 1 is attached to the inside of the shield frame a as shown in Fig. 5, or placed behind the shield frame (not shown) and connected with wires or the like and towed by a shield excavator. is formed into a cylindrical shell shape, and inside the cylindrical shell-shaped impermeable membrane storage box 1, impermeable membrane storage portions for storing a long belt-shaped impermeable membrane band 2 are staggered in the circumferential direction. Form and arrange in a shape. That is, as shown in FIGS. 1 and 2, the impermeable membrane storage box 1 has impermeable membrane storage sections 3 and 4 partitioned in a staggered manner in the circumferential direction. The permeable membrane storage portion 3 and the impermeable membrane storage portion 4 located on the rear side have width dimensions such that they overlap each other in the front and back direction on both sides in the circumferential direction, and each impermeable membrane storage portion 3, 4 Each impermeable membrane band 2a, 2b is formed with an outlet nozzle 5, 6 for the impermeable membrane near the outer periphery of the rear end, and is folded and stored individually in each impermeable membrane storage section 3, 4.
is discharged rearward from each storage section 3, 4 through an outlet nozzle 5, 6. Further, at the rear end of the impermeable membrane storage box 1 and at the rear side of both circumferential sides of each impermeable membrane storage section 4 on the rear side, from each of the front and rear impermeable membrane storage sections 3 and 4. A joining device 7 is installed to join the overlapping portions on both sides of the impermeable membrane bands 2a and 2b to be fed out, and the lap portions on both sides are joined by the joining devices 7 to form a cylindrical shape. The formed impermeable membrane 2 is fed out rearward from an impermeable membrane outlet nozzle 8 formed in a ring shape on the outer peripheral side of the rearmost end of the storage box 1.

Note that the bonding device 7 uses an ultrasonic oscillator, a high frequency oscillator, a heater, or the like. Reference numeral 9 indicates an overlap portion, that is, a joint, between the impermeable membrane bands 2a and 2b, 10 indicates a segment, and 11 indicates an impermeable membrane storage box 1.
This is a seal attached to the inner circumferential side of the impermeable membrane storage box 1 to prevent earth and sand from entering and solidifying between the segment 10 and the segment 10.

During shield work, the impermeable membrane is stored in the impermeable membrane storage box 1 in advance. In this case, in the present invention, the impermeable membrane storage parts 3 and 4 are provided inside the impermeable membrane storage box 1 in a staggered manner in the circumferential direction, and each storage part 3 and 4 is provided with a cylindrical impermeable membrane storage part 3 and 4. Impermeable membrane zone 2, which is shaped like a band in the same way as the membrane is divided in the circumferential direction.
A and 2b are stored compactly together.
At this time, since the impermeable membrane is band-shaped when stored, each impermeable membrane band 2a, 2b is Fold it in the longitudinal direction,
Alternatively, it is easy to roll it up, and it is also easy to make it compact and store it in each storage section 3 and 4.

One end of each of the impermeable membrane bands 2a and 2b compactly stored in each impermeable membrane storage section 3 and 4 in the impermeable membrane storage box 1 is connected to an outlet nozzle 5 for each storage section 3 and 4. , 6 to the rear, and pass through the outside of the joining device 7 to the rear from the outlet nozzle 8. Adjacent impermeable membrane bands 2a and 2b are arranged so as to overlap each other, and since a joining device 7 is disposed inside the overlap part, each impermeable membrane band 2a and 2b is connected to an outlet nozzle 8.
The overlap portion is joined by the joining device 7 before being pulled out to the rear.

When all the above preparations are completed, the shield excavator is propelled and the impermeable membranes are sequentially pulled out.
4 includes an impermeable membrane zone 2a divided into strips;
2b is stored, the impermeable membrane band 2
Join the overlap part 9 between a and 2b,
The impermeable membrane coming out of the outlet nozzle 8 is shown in Figures 3 and 4.
As shown in the figure, an impermeable membrane 2 formed into a cylindrical shape can cover the outer periphery of the segment 10.

Note that the present invention is not limited to the above embodiments. For example, an impermeable membrane 2 is used to cover the outer periphery of a segment in the shield method.
Although the case where the structure is made into a cylindrical shape is shown, if the structure is a rectangular tube shape such as a caisson, the impermeable membrane storage box 1 may be made into a rectangular tube shape to store the impermeable membrane bands 2a and 2b. , impermeable membrane zones 2a, 2b in the embodiment
The number of membranes to be arranged in the circumferential direction may be other than that shown in the figure, and although the case where the impermeable membrane storage parts 3 and 4 are alternately shifted back and forth is shown, it is possible to shift them in the inner and outer directions.
Of course, various other changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the present invention, when an impermeable membrane is stored in an impermeable membrane storage box, it is stored as an impermeable membrane band, and in order to coat a structure with the impermeable membrane, it is removed from the storage box. Since the adjacent water-impermeable membrane bands are joined together to form a cylindrical shape when being pulled out, and the structure is covered with the cylindrical water-impermeable membrane, the following excellent effects can be achieved.

(i) When storing the impermeable membrane in the impermeable membrane storage box, operations such as folding it into a compact size are very easy since the impermeable membrane is handled in a band shape, and the storage operation is also easy. .

(ii) Since the impermeable membrane band is folded and stored, the thickness of the storage part can be made thinner than when the cylindrical impermeable membrane is folded and stored as is;
The size of the storage box itself can be reduced.

(iii) Even if the impermeable membrane zone becomes long, it is easy to fold.

(iv) When covering a structure, the water-impermeable membrane can be easily formed into a cylindrical shape to match the external shape of the structure, so it can be applied to structures of any shape.

(v) The impermeable membrane zone can be of a certain width, so its preparation is easy.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the impermeable membrane storage box in the apparatus of the present invention, and FIG.
3 is a perspective view showing a state when covering a segment whose inner diameter is lined; FIG. 4 is a front view showing an example of the impermeable membrane of the present invention; FIG.
The figure shows an example of a conventional water-impermeable membrane coating device, Figure 6 is an enlarged view showing the main parts of a conventional water-impermeable membrane coating device, and Figure 7 shows a cylindrical impermeable membrane oriented in the axial direction. It is a figure which shows the state folded and stored. 1 is an impermeable membrane storage box, 2 is an impermeable membrane, 2a, 2
Reference numeral b indicates an impermeable membrane zone, 3 and 4 impermeable membrane housing parts, 7 a joining device, 8 an outlet nozzle, 9 a joining part, and 10 a segment.

Claims (1)

[Scope of Claims] 1. A plurality of impermeable membrane bands are individually stored in an impermeable membrane storage box by folding them according to the external shape of the structure to be coated, and when coating, the impermeable membrane bands are removed from the impermeable membrane storage box. An impermeable membrane coating method characterized by joining adjacent impermeable membrane bands to form a cylindrical shape when drawing out the permeable membrane, and coating the outer periphery of a structure with the cylindrical impermeable membrane. 2 Inside the impermeable membrane storage box, the storage area of impermeable membrane bands with a predetermined width is moved alternately in the front and back or inward and outward directions so that adjacent impermeable membrane bands overlap each other and are unrolled. At the exit end of the impermeable membrane storage box and at each impermeable membrane storage box, a joining device is installed around the circumference of the impermeable membrane storage box and connects together the overlapping parts of the impermeable membrane bands stored in each of the impermeable membrane storage boxes. An impermeable membrane coating device characterized in that it is provided at each overlap portion of membrane bands.