JP2016069862A - Folded waterproof sheet, and fitting method for waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability and reduce costs when fitting a waterproof sheet on an inner peripheral part of an adit.SOLUTION: A waterproof sheet 1 is fitted on an inner periphery of an excavated adit. The waterproof sheet 1 is rectangular, and a first direction X of two directions toward which the waterproof sheet extends coincides with the excavation direction of the adit. The waterproof sheet 1 is folded such that a plurality of first folding lines 11, 12 is positioned repeatedly at one edge side and the other edge side in the first direction X, the folding lines being orthogonal to the first direction X and parallel to each other, and one surface and the other surface of the waterproof sheet 1 appear alternately. The folded waterproof sheet 1 extends when pulled in the first direction X at an end 10 in the first direction X, for solving the problem.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a folded waterproof sheet and a method for attaching the waterproof sheet, and more particularly, to a folded waterproof sheet used when attached to the inner periphery of an excavated horizontal shaft and the waterproof sheet to the inside of the horizontal shaft. The present invention relates to a method of attaching a waterproof sheet attached to the periphery.

  When placing concrete on the inner peripheral surface of a tunnel, for example, as implemented by the NATM method, first a thin layer of primary lining concrete is sprayed on the inner periphery of the horizontal shaft, and then the primary lining concrete A waterproof sheet is attached to the surface, and then a thick secondary lining concrete is placed inside the waterproof sheet. The waterproof sheet prevents the spring water from the natural ground from entering the secondary lining concrete side from the primary lining concrete side.

  Generally, the waterproof sheet is comprised from the water-permeable layer and the water-impermeable layer. Such a waterproof sheet is attached between the primary lining concrete and the secondary lining concrete with the water-permeable layer facing the primary lining concrete side and the water-impermeable layer facing the secondary lining concrete side. . The permeable layer guides spring water from the natural mountain to the outside of the tunnel. On the other hand, the impermeable layer prevents the spring water from entering the secondary lining concrete.

  Therefore, in the construction method in which the waterproof sheet is interposed between the primary lining concrete and the secondary lining concrete, the waterproof sheet is removed from the ground between the primary lining concrete and the secondary lining concrete. The spring water must be shut off without fail. In order to block the spring water from the natural ground, the construction method for building a tunnel requires attaching a waterproof sheet to the inner periphery of the primary lining concrete.

  The applicant of the present patent has so far proposed various methods for attaching a waterproof sheet suitable for the above construction method and the waterproof sheet used for this attachment method. The waterproof sheet mounting method proposed in Patent Document 1 and Patent Document 2 and the waterproof sheet used in this mounting method are examples.

  The attachment method of the waterproof sheet proposed in Patent Document 1 is a construction method in which the waterproof sheet is rewound from the sheet roll and stretched around the inner periphery of the tunnel using a tension device. The tension device is attached to these wheel members, along with the inner circumference of the tunnel and a substantially arched rail member provided on the work carriage, at least a pair of wheel members provided movably on the rail member, And a shaft member that rotatably supports the sheet roll.

  This attachment method of the waterproof sheet is an attachment method in which construction is performed using a sheet roll formed by winding a waterproof sheet having a width of about 3 m to 4 m. In this attachment method, a plurality of sheet rolls are placed on the work surface of a work carriage stopped at a predetermined position where the attachment work is performed, and (1) the width direction of the waterproof sheet is made to coincide with the direction in which the tunnel extends. (2) Next, the waterproof sheet is extended from a new sheet roll, and the rear end of the waterproof sheet is joined to the front end of the previously attached waterproof sheet. Attach the waterproof sheet to the inner periphery of the tunnel. This work is repeated on the parked work carriage, and waterproof rolls for several rolls are attached to the inner periphery of the tunnel. (3) Thereafter, the work carriage is moved forward in accordance with the progress, and the waterproof sheet is attached over the entire length of the tunnel by performing the steps (1) and (2).

  In this attachment method, the shaft member is inserted into the sheet roll and the shaft member is attached to the wheel member. Then, by mounting the wheel member in the vicinity of the apex of the rail material formed in an approximately arch shape, after attaching the seat roll to the waterproof sheet tensioning device, the wheel member is rolled along the rail material, The tarpaulin that has been fed out is stretched. At that time, the width direction of the waterproof sheet is directed to the direction in which the tunnel extends.

  The method of attaching the waterproof sheet proposed in Patent Document 2 is a method in which the waterproof sheet is fixed to a fixing member fixed to the inner peripheral surface of the tunnel, and the waterproof sheet is spread in the tunnel. In this attachment method, the waterproof sheet is attached as follows. First, a waterproof sheet wound inward from both ends in the length direction toward the center is placed on an upper sheet pressing member that is movable up and down at an upper part of a base that is movably provided in the tunnel. Next, the waterproof sheet is tensioned by the hoisting mechanism and is developed downward from the upper sheet pressing member. Next, the developed portion of the waterproof sheet on the upper sheet pressing member is caused to move up the upper sheet pressing member and be fixed to the fixing member by the pressing force of the upper sheet pressing member. Further, the lower development portion of the waterproof sheet is fixed to the both sides of the base by the expansion and contraction and rotation of the plurality of side portions and the lower sheet pressing member which are provided to be extendable and rotatable in the circumferential direction of the tunnel. The waterproof sheet is spread in the tunnel by fixing it in order.

  The width | variety of the waterproof sheet used for this attachment method is 4-10 m. The waterproof sheet is attached with its width direction facing the direction in which the tunnel extends.

JP 2000-291392 A JP 2001-280096 A

  The mounting method of the waterproof sheet proposed by the above-mentioned Patent Document 1 is excellent in that the waterproof sheet can be mounted efficiently without requiring manual labor because the waterproof sheet is mounted on the inner periphery of the tunnel using a tension device. ing. Moreover, since the attachment method proposed by said patent document 2 attaches a waterproof sheet to a tunnel using a fastening member, it is excellent at the point which can attach a waterproof sheet to an exact position.

  However, in the waterproof sheet mounting method proposed in Patent Document 1, a waterproof sheet having a width of 3 m to 4 m and a relatively narrow width is used. For this reason, it is necessary to repeat the above steps (1) and (2), and it takes a considerable time to complete these steps. In addition, the steps (1) and (2) described above are steps that regulate the work period of the entire construction for constructing the tunnel. As a result, unless this process is completed, there is a problem of workability that it is not possible to proceed to the next waterproof sheet joining process and the work carriage moving process.

  On the other hand, this attachment method is a construction method using a tension device as described above. Therefore, there also exists a problem that the cost of the apparatus required for attaching a waterproof sheet becomes high.

  As for the mounting method of the waterproof sheet proposed in Patent Document 2, as with the mounting method of the waterproof sheet proposed in Patent Document 1, unless a series of operations for mounting the waterproof sheet on the work carriage is completed, There exists a problem of workability | operativity that it cannot progress to the joining process of the following waterproof sheet, and the movement process of a work trolley | bogie. However, in this waterproof sheet attaching method, since a waterproof sheet having a width of about 4 m to 10 m is used, it is possible to earn a distance for attaching the waterproof sheet in the excavation direction in an attachment process for each roll. However, since the waterproof sheet to be used has a large area, this method of attaching the waterproof sheet has a problem that it is necessary to carry a large work cart into the tunnel.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to improve workability when attaching the waterproof sheet to the inner periphery of the horizontal shaft and to suppress the cost at a low cost. An object of the present invention is to provide a waterproof sheet and a method for attaching the waterproof sheet.

(1) A waterproof sheet according to the present invention for solving the above-described problem is a waterproof sheet for attaching to the inner periphery of an excavated horizontal shaft, wherein the waterproof sheet has a rectangular shape, and the waterproof sheet extends. A first direction that is one of two directions corresponds to the excavation direction of the horizontal shaft, and the waterproof sheet is perpendicular to the first direction and is parallel to each other. Is repeatedly positioned at one end side and the other end side in the first direction, and is folded in a form in which one side and the other side of the waterproof sheet itself appear alternately, and the waterproof is folded. The sheet is characterized in that the sheet can be developed by pulling an end portion in the first direction in the first direction.

  According to this invention, since the waterproof sheet is folded as described above, when the waterproof sheet is attached to the inner periphery of the horizontal shaft using the work carriage, the folded waterproof sheet is placed in the first direction. By simply pulling, the waterproof sheet can be deployed in the direction of excavation of the horizontal shaft on the work surface of the work carriage. Therefore, a waterproof sheet having a long length in the first direction can be used. By using the waterproof sheet having a long length in the first direction, it is possible to increase the length in the excavation direction of the horizontal shaft to which one waterproof sheet is attached. As a result, it is possible to significantly reduce the man-hours and time required for attaching the waterproof sheet by stopping the work carriage at a certain position of the horizontal shaft and improving workability. Moreover, since the waterproof sheet is configured to be deployable by pulling the end portion in the first direction in the first direction, it is not necessary to use a special device when deploying the waterproof sheet. Therefore, the waterproof sheet can be attached to the inner periphery of the horizontal shaft at a low cost.

  In the waterproof sheet according to the present invention, the length between the first fold line on one end side in the first direction and the first fold line on the other end side is not less than 200 mm and not more than 2300 mm.

  According to this invention, since the length between the first fold lines is within the above range, it is possible to facilitate handling of the waterproof sheet such as folding work of the waterproof sheet and unfolding work of the folded waterproof sheet. it can.

  In the waterproof sheet according to the present invention, the waterproof sheet folded at a plurality of the first fold lines has a plurality of second fold lines orthogonal to the first fold lines and parallel to each other. One side and the other side of the waterproof sheet, which are repeatedly positioned at one end side and the other end side in the second direction orthogonal to the direction, and folded at a plurality of the first fold lines. Are folded in a form that appears alternately, and the folded waterproof sheet can be developed by pulling an end portion in the second direction in the second direction.

  According to this invention, since the waterproof sheet is folded as described above, when the waterproof sheet is attached to the inner periphery of the horizontal shaft using the work carriage, the folded waterproof sheet is placed in the second direction. By simply pulling, it can be developed in the width direction of the work surface on the work surface of the work carriage. Therefore, the waterproof sheet can be placed on the work surface in a short time.

  The waterproof sheet according to the present invention is characterized in that the waterproof sheet folded at a plurality of the first fold lines is wound in a second direction orthogonal to the first direction.

  According to this invention, since the waterproof sheet is wound as described above, when the waterproof sheet is attached to the inner periphery of the horizontal shaft using the work carriage, the wound waterproof sheet is placed in the second direction. It can be easily deployed by pulling on the tarpaulin or using its own weight. Therefore, the waterproof sheet can be placed on the work surface in a short time.

  In the waterproof sheet according to the present invention, an attachment member for attaching a rope is detachably provided at an end portion in the first direction.

  According to this invention, since the attachment member for attaching the rope is detachably provided at the end portion in the first direction, the rope is attached to the attachment member when the waterproof sheet is deployed in the first direction. Thus, the waterproof sheet can be developed by pulling the rope. Therefore, the efficiency of the deployment work can be improved. Moreover, since the attachment member can be attached to and detached from the waterproof sheet, the waterproof sheet can be smoothly attached to the inner periphery of the horizontal shaft by removing the attachment member after deployment.

(2) A waterproof sheet mounting method according to the present invention for solving the above-described problems is a waterproof sheet mounting method for mounting a rectangular waterproof sheet on the inner periphery of an excavated horizontal shaft. A deployment step of deploying the waterproof sheet on the arched work surface of the work carriage carried into the mine, and a sheet attachment step of attaching the waterproof sheet deployed on the work surface to the inner peripheral portion of the horizontal shaft And the unfolding step corresponds to the excavation direction of the horizontal shaft and corresponds to the first direction which is one of the two directions in which the waterproof sheet extends, and is folded into a predetermined form. A first unfolding step disposed along the width direction of the work surface, and a predetermined form by pulling one end of the waterproof sheet folded in a predetermined form in the first direction in the first direction. Before folded into A second unfolding step of unfolding the waterproof sheet, wherein the predetermined form has a plurality of first folding lines orthogonal to the first direction and parallel to each other in one of the first directions. The waterproof sheet is repeatedly positioned on one end side and the other end side, and is folded in such a manner that one side and the other side of the waterproof sheet itself appear alternately.

  According to this invention, since the waterproof sheet folded as described above is used, when the waterproof sheet is attached to the inner periphery of the horizontal shaft using the work carriage, the folded waterproof sheet is placed in the first direction. It is possible to deploy the waterproof sheet in the direction of excavation of the horizontal shaft on the work surface of the work carriage. Therefore, a waterproof sheet having a long length in the first direction can be used. By using the waterproof sheet having a long length in the first direction, it is possible to increase the length in the excavation direction of the horizontal shaft to which one waterproof sheet is attached. As a result, it is possible to significantly reduce the man-hours and time required for attaching the waterproof sheet by stopping the work carriage at a certain position of the horizontal shaft and improving workability. Moreover, since the waterproof sheet is configured to be deployable by pulling the end portion in the first direction in the first direction, it is not necessary to use a special device when deploying the waterproof sheet. Therefore, the waterproof sheet can be attached to the inner periphery of the horizontal shaft at a low cost.

  In the waterproof sheet mounting method according to the present invention, in the first unfolding step, a plurality of second fold lines perpendicular to the first fold line and parallel to each other are perpendicular to the first direction. In the form of repeatedly appearing on one end side and the other end side in the direction of, and alternately appearing one side and the other side of the waterproof sheet folded by the plurality of first fold lines The folded end of the waterproof sheet in the second direction is developed on the work surface by pulling from the one end side in the width direction of the work surface to the other end side along the work surface. It is characterized by that.

  According to this invention, since the waterproof sheet folded as described above is used, when the waterproof sheet is attached to the inner periphery of the horizontal shaft using the working carriage, the folded waterproof sheet is placed in the second direction. By simply pulling, it can be developed in the width direction of the work surface on the work surface of the work carriage. Therefore, the waterproof sheet can be placed on the work surface in a short time.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve workability | operativity at the time of attaching a waterproof sheet to the inner periphery of a horizontal shaft, the cost required for construction can be suppressed inexpensively.

It is the perspective view which showed typically the waterproof sheet which concerns on one Embodiment of this invention. It is the perspective view which showed typically the waterproof sheet of the form folded by the some 1st fold line. It is explanatory drawing for demonstrating the aspect in which the attachment member for attaching a rope was attached to the edge part of the 1st direction of a waterproof sheet. It is the perspective view which showed typically the waterproof sheet of the form folded by the some 2nd fold line. It is explanatory drawing of the process of folding a waterproof sheet using a trolley | bogie. It is the perspective view which showed typically the waterproof sheet wound toward the other end from the one end of a 2nd direction. It is the perspective view which showed typically the waterproof sheet wound toward the center from the both ends of the 2nd direction. It is a front view of the work trolley carried into a horizontal shaft and a horizontal shaft. It is explanatory drawing for demonstrating the process of expand | deploying the folded waterproof sheet | seat in a 2nd direction. It is explanatory drawing for demonstrating the process of expand | deploying the folded waterproof sheet | seat in a 1st direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The technical scope of the present invention is not limited only to the following description and drawings.

[Basic structure of waterproof sheet]
The waterproof sheet 1 which concerns on this invention is a waterproof sheet for attaching to the inner periphery of the excavated horizontal shaft. In particular, the waterproof sheet 1 is disposed between the primary lining concrete sprayed on the inner periphery of the horizontal shaft and the thick secondary lining concrete when the concrete is placed on the inner peripheral surface of the tunnel. It is used to prevent water from entering from the primary lining concrete side to the secondary lining concrete side.

  As shown in FIG. 1, the waterproof sheet 1 has a rectangular shape, and a first direction X that is one of the two directions in which the waterproof sheet 1 extends corresponds to the excavation direction of the horizontal shaft. As shown in FIG. 2, the waterproof sheet 1 includes a plurality of first fold lines 11, 12 orthogonal to a first direction X corresponding to the excavation direction of the horizontal shaft and parallel to each other in the first direction. It is folded in such a manner that it is repeatedly positioned on one end side and the other end side of X. At that time, the waterproof sheet 1 is folded in a form in which one surface and the other surface of the waterproof sheet 1 appear alternately. The folded waterproof sheet 1 can be unfolded when the end portion 20 in the first direction X is pulled in the first direction X.

  The waterproof sheet 1 having the above-described basic configuration can improve the workability when the waterproof sheet 1 is attached to the inner periphery of the horizontal shaft, and has a specific effect that the cost required for construction can be kept low. .

  Hereinafter, a specific configuration of the waterproof sheet 1 will be described with reference to the drawings as appropriate.

  As shown in FIG. 1, the waterproof sheet 1 has a rectangular shape. In the waterproof sheet 1, the length L1 in the first direction X corresponding to the excavation direction of the horizontal shaft is 5 m or more and 15 m or less, and the length L2 in the second direction Y orthogonal to the first direction X is 20 m. This is 30 m or less. In FIG. 1, the direction indicated by reference sign X is a first direction X corresponding to the excavation direction of the horizontal shaft, and the direction indicated by reference sign Y is a second direction Y orthogonal to the first direction X. is there. This waterproof sheet 1 is attached to the inner periphery of the excavated horizontal shaft, and prevents liquid such as water or gas such as water vapor from leaking from the natural ground surrounding the horizontal shaft.

  As shown in FIG. 1, the waterproof sheet 1 is a sheet in which a water-permeable layer 2 and a water-impermeable layer 3 are laminated. In such a waterproof sheet, the water-permeable layer 2 is directed outward and the water-impermeable layer 3 is directed inward. The permeable layer 2 sucks the liquid or gas leaked from the natural ground into the horizontal shaft and guides it to the outside of the horizontal shaft. On the other hand, the water-impermeable layer 3 prevents liquid or gas leaking from the natural ground from penetrating into the side shaft.

(Water-permeable layer)
The water permeable layer 2 is composed of a nonwoven fabric, a woven fabric, a knitted fabric or the like. Among these, a nonwoven fabric, a woven fabric, a knitted fabric, or the like can be preferably applied because it can be a water permeable layer 2 having water permeability and a locked portion. The thickness of the water permeable layer 2 is preferably in the range of 3 mm or more and 5 mm or less.

(Impermeable layer)
The impermeable layer 3 is a layer which has no or very little water permeability. Examples of the material of the water-impermeable layer 3 include ethylene vinyl acetate copolymer (EVA), polyvinyl chloride, polyethylene, polypropylene, polystyrene, acrylonitrile-butadiene-styrene (ABS) resin, acrylonitrile-styrene ( AS) resin, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyamideimide, polyetherimide, polyetheretherketone, liquid crystal polymer, poly Thermoplastic organic materials such as tetrafluoroethylene; phenol resin, urea resin, melamine resin, unsaturated polyester, epoxy resin, silicone resin, polyurea Thermosetting organic materials such as emissions can be mentioned. The thickness of the water-impermeable layer 3 is preferably in the range of 0.6 mm or more and 2 mm or less.

  The water-impermeable layer 3 may be composed of a single material among these thermoplastic organic materials and thermosetting organic materials, or may be a composite or laminate of two or more of the same kind of materials or different kinds of materials. You may comprise.

[Specific form of folded tarpaulin]
Such a waterproof sheet 1 is folded as shown in FIGS. 2 and 4. The waterproof sheet 1 is folded at regular intervals in the first direction X, and folded in the form shown in FIG. Specifically, the waterproof sheet 1 is folded at a plurality of first fold lines 11 and 12 that are orthogonal to the first direction X and parallel to each other, and the plurality of first fold lines 11 and 12 are folded. It is repeatedly positioned on one end side and the other end side in the first direction X. Moreover, the waterproof sheet 1 is folded in a form in which one surface and the other surface of the waterproof sheet 1 appear alternately. In FIG. 2, the direction indicated by reference sign X is the first direction X corresponding to the excavation direction of the horizontal shaft, and the direction indicated by reference sign Y is the second direction Y orthogonal to the first direction X. is there.

  As shown in FIG. 2, the waterproof sheet 1 is folded at a plurality of first fold lines 11, 12, whereby the first fold line 11 on the one end side in the first direction X and the other end. The length L3 between the first fold line 12 on the part side is folded to 200 mm or more and 2300 mm or less.

  When the length L3 is shorter than 200 mm, the waterproof sheet 1 folded at the fold lines 11 and 12 becomes thick, and it becomes difficult to fold at the second fold lines 21 and 22. Moreover, when the waterproof sheet 1 is deployed by pulling the end portion 10 in the first direction X, it is difficult to deploy the waterproof sheet 1 quickly and accurately. Further, it takes a lot of time to fold the folding lines 11 and 12. On the other hand, when the length L3 is longer than 2300 mm, handling of the folded waterproof sheet 1 becomes troublesome.

  The length L3 between the first fold lines 11 and 12 located at both ends in the first direction X is the length in the first direction X of the waterproof sheet 1 itself, and the folded waterproof sheet 1 in advance. It is set appropriately according to the size of the storage space for storing, the number of waterproof sheets 1 to be stored, and the like. When the waterproof sheet 1 is folded, the waterproof sheet 1 is folded in order from the one end side in the first direction X along the first fold lines 11 and 12, and the folded portions are folded in order. .

  The folded waterproof sheet 1 is configured to be unfolded when the end portion 10 in the first direction X located on the uppermost side is pulled in the first direction X. The developed waterproof sheet 1 is spread in the rectangular shape shown in FIG.

  An attachment member for attaching a rope for pulling the end portion 10 in the first direction X is detachably attached to the end portion 10 in the first direction X of the waterproof sheet 1. For example, as shown in FIG. 3, the wire rope 50 is used as an attachment member for attaching the rope. The wire rope 50 is disposed along the end portion 10 and is detachably attached to the waterproof sheet 1 by winding the end portion 10 of the waterproof sheet 1 around the outer periphery of the wire rope 50.

  The waterproof sheet 1 is further folded from the form shown in FIG. 2 to the form shown in FIG. Specifically, the waterproof sheet 1 folded at the first fold lines 11, 12 has a plurality of second fold lines 21, 22 orthogonal to the first fold lines 11, 12 and parallel to each other. The second direction Y that is orthogonal to the first direction X is folded into a form that is repeatedly positioned on one end side and the other end side. At that time, the sheet is folded in such a manner that the one side and the other side of the waterproof sheet 1 folded along the plurality of first fold lines 11 and 12 appear alternately.

  As shown in FIG. 4, the waterproof sheet 1 is folded at a plurality of second fold lines 21 and 22, whereby the second fold line 21 on the one end side in the second direction Y and the other end. The length L4 between the second folding line 22 on the part side is folded to 500 mm or more and 3000 mm or less. The length between the second fold lines 21 and 22 located at both ends in the second direction Y is the length of the waterproof sheet 1 itself in the second direction Y, the folded waterproof sheet 1 in advance It is appropriately set according to the size of the storage space for storing, the number of waterproof sheets 1 to be stored, and the like. Further, the length between the second folding lines 21 and 22 depends on the size of the carriage 100 used when folding work or the size of the platform such as the pallet 110 on which the folded waterproof sheet is placed. Is set.

  When the waterproof sheet 1 is folded at the second fold lines 21 and 22, for example, a carriage 100 is used as shown in FIG. The waterproof sheet 1 is folded in order at the positions of the second fold lines 21 and 22 from one end side in the second direction Y, and the folded portions are overlapped. Overlapping of the folded portions is performed on the carriage 100. The trolley 100 is moved toward the end 20 in the second direction Y each time the waterproof sheet 1 is folded at the second fold lines 21 and 22 and the folded portions are sequentially placed on the trolley 100. Thus, by using the cart 100 when the waterproof sheet 1 is folded along the second fold lines 21 and 22, it can be efficiently folded.

  The waterproof sheet 1 folded at the second fold lines 21 and 22 is configured to be unfolded by pulling the end portion 20 in the second direction Y located on the uppermost side in the second direction Y. Yes. The waterproof sheet 1 is expanded to the form shown in FIG. 2 by being unfolded.

[Concrete form of wound tarpaulin]
In addition, the waterproof sheet 1 is replaced with the folded form shown in FIG. 4, and the waterproof sheet 1 folded by the 1st fold lines 11 and 12 is 1st direction X as shown in FIG. 6 or FIG. Can be wound in a second direction Y orthogonal to the shape.

  In the waterproof sheet 1 shown in FIG. 6, the waterproof sheet 1 (the form shown in FIG. 2) folded at the first fold lines 11 and 12 is wound from one end side to the other end side in the second direction Y. Is made up of. The waterproof sheet 1 is gradually positioned outward in the radial direction from the edge 15 on the one end side in the second direction Y toward the edge 16 on the other end side, which is located at the center in the radial direction. It is wound in a spiral so as to be positioned. And the waterproof sheet 1 is comprised so that the edge 16 located in the outermost side can be expand | deployed in the form shown in FIG.

  The waterproof sheet 1 shown in FIG. 7 has the form wound in the direction shown in FIG. 2 from both ends in the second direction Y toward the center. The waterproof sheet 1 is lyrically positioned radially outward from the both end edges 15 and 16 of the second direction Y located at the center in the radial direction toward the center side in the second direction Y. It is wound like a spiral. Therefore, two rolls of the folded waterproof sheet 1 are formed side by side.

  When deploying the waterproof sheet, for example, first, a roll in which the end edge 15 on one end side in the second direction Y is centered is developed, and then the end edge 16 on the other end side is moved to the first end 16. By pulling in the second direction Y, the roll is developed in which the end edge on the other end side in the second direction Y is located at the center.

  However, this waterproof sheet may be developed as follows. First, the waterproof sheet 1 in the form wound in the form shown in FIG. 7 is placed on the apex located on the uppermost side of the arch-shaped work surface. The first direction X of the waterproof sheet 1 placed at the apex of the work surface coincides with the direction in which the work carriage extends, that is, the direction in which the horizontal shaft extends. In other words, the second direction Y of the waterproof sheet 1 placed at the apex of the work surface coincides with the circumferential direction of the work surface. Next, the sheet roll of the waterproof sheet 1 is developed by its own weight.

[Attaching the waterproof sheet]
Next, with reference to FIGS. 8 to 10, a method of attaching a waterproof sheet for attaching the rectangular waterproof sheet 1 to the inner periphery of the excavated horizontal shaft T will be described.

  When constructing a tunnel by placing concrete on the inner circumference of the excavated horizontal shaft T, first, for example, a thin layer of primary lining concrete is blown on the inner periphery of the horizontal shaft T, as in the NATM method. wear. Subsequently, the waterproof sheet 1 is attached to the content surface of the primary lining concrete, and then a thick secondary lining concrete is placed inside the waterproof sheet 1. In that case, the attachment method of the waterproof sheet 1 according to the present invention is implemented when attaching the waterproof sheet 1 to the inner surface of the primary lining concrete.

  In the method of attaching the waterproof sheet 1, as shown in FIG. 8, the work cart 200 is carried into the excavated horizontal shaft T and the construction is performed. A rail 210 is laid in the horizontal shaft T in a direction extending in the excavation direction of the horizontal shaft T. The work carriage 200 is placed on the rail 210. The working carriage 200 includes a work surface 201 having an arched cross section at the top. The work surface 201 extends in the direction in which the rail 210 extends, that is, in the direction in which the horizontal shaft T is excavated.

  The method for attaching the waterproof sheet 1 includes the step of expanding the waterproof sheet 1 on the arch-shaped work surface 201 of the work carriage 200 carried into the horizontal shaft T, and the waterproof sheet expanded on the work surface 201. A sheet attaching step for attaching 1 to the inner periphery of the horizontal shaft T. The expansion process includes a first expansion process and a second expansion process described below.

  The first unfolding step is a step of unfolding the waterproof sheet 1 folded in the form shown in FIG. 4 on the work surface 201 of the working carriage 200 into the form folded in the form shown in FIG. . The second unfolding step is a step of unfolding the waterproof sheet 1 folded in the form shown in FIG. 2 on the work surface 201 of the working carriage 200 into a fully expanded form as shown in FIG. It is.

(First deployment process)
A 1st expansion | deployment process expand | deploys the waterproof sheet 1 folded in the form shown in FIG. Specifically, the waterproof sheet 1 has a second direction in which a plurality of second fold lines 21 and 22 perpendicular to the first fold lines 11 and 12 and perpendicular to each other are orthogonal to the first direction X. It is folded in a form that is repeatedly positioned on one end side and the other end side of Y. Moreover, the waterproof sheet 1 is folded in a form in which one side and the other side of the waterproof sheet 1 folded along the plurality of first fold lines 11 and 12 appear alternately. The folded waterproof sheet 1 is placed on a pallet 110, for example.

  As shown in FIG. 9, the folded waterproof sheet 1 has the end 20 in the second direction Y of the waterproof sheet 1 along the work surface 201 from the one end 202 side in the width direction of the work surface 201. By pulling toward the other end 203 side, the work surface 201 is developed. When pulling the waterproof sheet 1 in the second direction Y, the rope 120 is attached to the waterproof sheet 1.

  The rope 120 is arranged on the outer peripheral surface so as to extend in the circumferential direction of the work surface 201. Then, one end 122 in the longitudinal direction of the rope 120 is attached to the end portion 20 in the second direction Y of the waterproof sheet 1 on the one end 202 side in the width direction of the work surface 201. Further, the other end 123 in the longitudinal direction of the rope 120 is wound around the winding device 130 on the other end 203 side in the width direction of the work surface 201. In addition, as the rope 120, a wire rope, a nylon rope, a hemp rope, or the like is used.

  In this first unfolding step, the winding device 130 winds the rope 120, so that the waterproof sheet 1 is pulled from the one end 202 side in the width direction of the work surface 201 toward the other end 203 side, and in the circumferential direction. Be expanded. When the waterproof sheet 1 is unfolded, the waterproof sheet 1 folded on the pallet 110 is unfolded in order from the folded upper part, and the unfolded part moves in the circumferential direction on the upper surface of the work surface 201. .

  The prevention sheet unfolded by the first unfolding step is unfolded in the folded form shown in FIG. In the deployed waterproof sheet 1, the first direction X matches the direction in which the work surface 201 extends, that is, the excavation direction of the horizontal shaft T. In other words, the second direction Y of the waterproof sheet 1 matches the circumferential direction of the work surface 201. The developed waterproof sheet 1 is arranged on the work surface 201 in a form extending in the circumferential direction of the work surface 201 at the end of the work surface 201.

  The development of the waterproof sheet 1 is not limited to winding the rope 120 with the winding device 130. The waterproof sheet 1 may be developed by an operator pulling the other end side of the rope 120 in the longitudinal direction.

(Second development process)
A 2nd expansion | deployment process is a process of expand | deploying the waterproof sheet 1 by pulling the edge part 10 of the 1st direction X of the waterproof sheet 1 folded in the predetermined form to the 1st direction X. As shown in FIG. 2, the predetermined form here refers to a plurality of first fold lines 11 and 12 that are orthogonal to the first direction X and parallel to each other. It is the form folded up so that one side and other side of waterproofing sheet 1 itself may appear alternately while being repeatedly located in the edge part side and the other edge part side. The waterproof sheet 1 is unfolded on the work surface 201 by pulling the end portion in the first direction X in the second unfolding step in the direction in which the horizontal shaft T extends.

  When pulling the waterproof sheet 1 in the first direction X, a rope 140 is attached as shown in FIG. The rope 140 may be a wire rope, nylon rope, hemp rope, or the like, similar to the rope 120. When the rope 140 is attached to the end portion 10 of the waterproof sheet 1, as described with reference to FIG. 3, an attachment member for attaching the rope 140 is attached to the end portion 10 in the first direction X of the waterproof sheet 1. Removably attached. As shown in FIG. 3, for example, a wire rope 50 is used as an attachment member for attaching the rope 140. The wire rope 50 is disposed along the end portion 10 and is detachably attached to the waterproof sheet 1 by winding the end portion 10 of the waterproof sheet 1 around the outer periphery of the wire rope 50.

  The rope 140 is extended in the first direction X on the work surface 201, and one end 142 in the longitudinal direction is attached to the end portion 10 in the first direction X in the waterproof sheet 1. Further, the other end 143 of the rope 140 in the longitudinal direction is wound around a winding device 150 provided at the front portion of the work carriage 200. As shown in FIG. 10A, the waterproof sheet 1 folded in the state shown in FIG. 2 on the rear side of the work surface 201 is wound on the work surface 201 by the rope 140 being wound up by the winding device 150. Pulled forward. As shown in FIG. 10B, the waterproof sheet 1 pulled by the rope 140 is developed in order from the upper layer of the folded portion, and the folded portion stays at the rear portion of the work surface 201. Only the developed part moves to the front side of the work surface 201. By pulling the end portion 10 of the waterproof sheet 1 in the first direction further to the front side of the work surface 201 by the rope 140, all the folded portions of the waterproof sheet 1 are unfolded. When the waterproof sheet 1 is deployed, as shown in FIG. 10C, the waterproof sheet 1 is spread along the arch-shaped work surface 201 and covers the work surface 201. As a result, the range of about 5 m to 15 m in the excavation direction of the horizontal shaft T in the waterproof sheet 1 is opposed to the inner periphery of the horizontal shaft T.

  In this waterproof sheet 1 attachment method, the range of about 5 m to 15 m in the excavation direction of the horizontal shaft T in the waterproof sheet 1 can be opposed to the inner periphery of the horizontal shaft T. Therefore, compared with the conventional construction method, The waterproof sheet 1 can be attached to a long range in the excavation direction of the horizontal shaft T in the process of the rotation. Therefore, the man-hour and time at the time of attaching the waterproof sheet by stopping the working carriage 200 at a certain position of the horizontal shaft T can be greatly reduced. Further, in the method of attaching the waterproof sheet 1, since it is not necessary to use a special device when the waterproof sheet 1 is deployed, the waterproof sheet 1 can be attached to the inner periphery of the horizontal shaft T at a low cost.

  The case where the waterproof sheet 1 is developed by attaching the rope 140 only to one end of the waterproof sheet 1 in the first direction X has been described as an example. However, a plurality of ropes 140 may be prepared, and the waterproof sheet 1 may be deployed by attaching the ropes 140 to a plurality of locations at the end in the first direction X of the waterproof sheet 1. Further, the development of the waterproof sheet 1 is not limited to winding the rope 140 with the winding device 150. The waterproof sheet 1 may be unfolded by an operator pulling the other end of the rope 140 in the longitudinal direction.

DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Water-permeable layer 3 Water-impermeable layer 10 End of the folded waterproof sheet in the first direction 11, 12 First fold line 15, 16 Edge of the folded waterproof sheet in the second direction 20 Ends in the second direction of the folded waterproof sheet 21, 22 Second fold line 50 Wire rope (attachment member for attaching the rope)
100 cart 110 pallet 120,140 rope 122,142 one end of rope 123,143 other end of rope 200 working cart 201 working surface 210 rail X first direction Y second direction T side shaft

Claims (7)

A waterproof sheet for attaching to the inner periphery of a drilled horizontal shaft,
The waterproof sheet has a rectangular shape,
The first direction that is one of the two directions in which the waterproof sheet extends corresponds to the excavation direction of the horizontal shaft,
In the waterproof sheet, a plurality of first fold lines orthogonal to the first direction and parallel to each other are repeatedly positioned on one end side and the other end side in the first direction. And the one side of the waterproof sheet itself and the other side are folded in a form that appears alternately,
The folded waterproof sheet, wherein the folded waterproof sheet can be developed by pulling an end portion in the first direction in the first direction.   The folded waterproof according to claim 1, wherein a length between the first fold line on one end side in the first direction and the first fold line on the other end side is 200 mm or more and 2300 mm or less. Sheet. The waterproof sheet folded at a plurality of the first fold lines is perpendicular to the first fold lines, and a plurality of second fold lines that are parallel to each other are perpendicular to the first direction. It is repeatedly positioned on one end side and the other end side in the direction, and is folded in a form in which one side and the other side of the waterproof sheet folded at a plurality of the first fold lines alternately appear. And
The folded waterproof sheet according to claim 1 or 2, wherein the folded waterproof sheet is expandable when an end portion in the second direction is pulled in the second direction.   The folded waterproof sheet according to claim 1 or 2, wherein the waterproof sheet folded at a plurality of the first fold lines is wound in a second direction orthogonal to the first direction.   The folded waterproof sheet according to any one of claims 1 to 4, wherein an attachment member for attaching a rope is detachably provided at an end portion in the first direction. A method of attaching a waterproof sheet for attaching a rectangular waterproof sheet to the inner periphery of an excavated horizontal shaft,
An unfolding step of unfolding the waterproof sheet on the arched work surface of the working carriage carried into the horizontal shaft,
A sheet attaching step of attaching the waterproof sheet developed on the work surface to the inner periphery of the horizontal shaft,
The unfolding step is
The first direction which is one of the two directions in which the waterproof sheet extends corresponds to the excavation direction of the horizontal shaft, and is along the width direction of the work surface of the waterproof sheet folded in a predetermined form. A first unfolding step to be arranged,
A second unfolding step of unfolding the waterproof sheet folded into a predetermined form by pulling one end in the first direction of the waterproof sheet folded into a predetermined form in the first direction; ,
In the predetermined form, a plurality of first fold lines perpendicular to the first direction and parallel to each other are repeatedly positioned on one end side and the other end side in the first direction. In addition, the waterproof sheet is folded in such a manner that one surface and the other surface of the waterproof sheet themselves are alternately displayed. In the first unfolding step, a plurality of second fold lines that are orthogonal to the first fold line and parallel to each other are arranged on one end side and the other in the second direction orthogonal to the first direction. The second side of the waterproof sheet that is repeatedly positioned on the end side and folded in a form in which one side and the other side of the waterproof sheet that are folded at a plurality of the first fold lines alternately appear. The waterproof sheet mounting according to claim 6, wherein an end portion in a direction is developed on the work surface by pulling the end portion along the work surface from one end side in the width direction of the work surface to the other end side. Method.

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