JP3878201B2 - Tunnel waterproof sheet and joining method thereof - Google Patents

Description

  The present invention relates to a waterproof sheet for a tunnel used as a waterproofing work in a mountain tunnel method, a shield tunnel method, an open-cut tunnel method, and the like, and a joining method thereof.

  In the mountain tunnel construction method, shotcrete is applied to the ground while using rock bolts together to prevent loosening of the excavated ground, and then lining concrete is wound on the shotcrete to stabilize the tunnel for a long time. However, prior to the construction of the lining concrete, it is common to prevent water leakage into the tunnel by attaching a predetermined waterproof sheet so as to fit the unevenness of the shot concrete.

  In the shield tunnel method, the shield is excavated with a jack and the segments are assembled in the tail of the shield as the primary lining, and then the cast-in-place concrete is wound up as the secondary lining. Prior to the next lining, waterproofing is generally performed to prevent water leakage through a slight gap generated between the segment pieces or between the segment rings.

  Furthermore, in the open-cut tunneling method, after the tunnel housing is constructed, the outer surface thereof is covered with a waterproof sheet to maintain the watertightness of the tunnel housing.

  Here, when constructing the waterproof sheet on the inner and outer surfaces of the tunnel, the edges of the waterproof sheet of a predetermined size are overlapped and joined sequentially, but the joined part of such a waterproof sheet has a water-stopping property. Joining was performed by welding or adhesion so as to ensure.

Microfilm of No. 56-155869 JP-A-1-315511 Japanese Patent Publication No. 5-87640

  However, in the case of joining by conventional welding, equipment for welding is required, and skill is required for the workers performing the joining work, and much time and labor are required for work such as installation and removal of equipment. The problem of having to spend has arisen.

  Further, in a place where workability is poor such as a narrow place, there has been a problem that it becomes difficult to work using equipment for welding.

  On the other hand, in the case of joining with an adhesive, there has been a problem that the waterproof sheet may be peeled off due to poor adhesion.

  The present invention has been made in consideration of the above-described circumstances, and a waterproof sheet for a tunnel capable of easily forming a high water-stop joint in a short time without using a lot of equipment and equipment, and An object is to provide a joining method thereof.

In order to achieve the above object, the tunnel waterproof sheet according to the present invention has a first joining region formed on the surface along a predetermined edge portion, and the opposite side to the edge portion. In the waterproof sheet for tunnels formed to form a second bonding region on the back surface along the edge located at the rear, and to join the first and second bonding regions to overlap each other,
A state in which an electric heating body is embedded in the vicinity of the surface of at least one of the first and second bonding areas, and the first and second bonding areas are overlapped with each other by energizing the electric heating body. The low melting point welding material is provided in at least one of the first and second bonding regions, and the first and second bonding regions are heated via the low melting point welding material. It is configured so that it can be welded.

In addition, the tunnel waterproof sheet according to the present invention has a first joining region formed on the surface along a predetermined edge and an edge located on the opposite side to the edge as described in claim 2. In the tunnel waterproof sheet formed to form a second bonding region on the back surface along the first and second bonding regions to overlap each other,
A state in which an electric heating body is embedded in the vicinity of the surface of at least one of the first and second bonding areas, and the first and second bonding areas are overlapped with each other by energizing the electric heating body. In the first and second bonding regions, a predetermined protrusion is provided in one of the bonding regions so as to be parallel to the edge of the bonding region, and the other bonding is performed. A predetermined groove-shaped recess is provided in the region so as to be parallel to the edge of the joint region, and the groove-shaped recess is formed so that the protrusion is fitted into the groove-shaped recess. An electric heating body is embedded in the strip along the material axis direction of the projection.

The tunnel waterproof sheet joining method according to the present invention includes forming a first joining region on a surface along a predetermined edge and a second along an edge located on the opposite side of the edge. In the bonding method of the waterproof sheet for tunnels, in which the waterproof sheet for tunnels formed on the back surface of the bonding region is bonded with the first and second bonding regions overlapped with each other,
The first and second bonding regions are overlapped with each other, and in this state, pressure is applied to the first and second bonding regions, and at least one of the first and second bonding regions is bonded. A low melting point welding material provided in at least one of the first and second joining regions while energizing the electric heating body embedded near the surface of the region to thermally weld the first and second joining regions Is melted together with the first and second joining regions.

The tunnel waterproof sheet joining method according to the present invention is characterized in that, as described in claim 4, the first joining region is formed on the surface along a predetermined edge portion, and is positioned on the opposite side to the edge portion. A tunnel waterproof sheet formed by forming a second bonding region on the back surface along the edge to be bonded, and a tunnel waterproof sheet bonding method in which the first and second bonding regions are overlapped and bonded to each other.
Of the first and second joining regions, a predetermined protrusion provided in one joining region so as to be parallel to the edge of the joining region, and an edge of the joining region in the other joining region. Of the first and second bonding regions, while being fitted in a predetermined groove-shaped recess provided to be parallel to each other and loading pressure on the first and second bonding regions in such a state, Energizing the electric heating element embedded in the vicinity of the surface of at least one of the bonding regions to melt the bonding region and energizing the electric heating element embedded in the protrusions along the material axis direction of the protrusion Then, the protrusion is melted and the first and second joining regions are heat-welded.

  In the tunnel waterproof sheet according to the first aspect of the present invention, since the electric heating body is provided in the vicinity of the surface of at least one of the first and second joining regions, the first and second joinings are provided. The first and second joining regions are melted by energizing the electric heating body with the regions overlapped with each other. Therefore, the first and second joining regions are integrated by thermal welding as in the conventional case, and high water tightness and joining force are ensured in the joining region of the tunnel waterproof sheet.

  The electric heating element only needs to be able to melt the first and second bonding regions in a state where the first and second bonding regions are overlapped with each other, and the arrangement of the electric heating elements is arbitrary. It may be provided in both of the second bonding regions, or may be provided only in one of the bonding regions depending on circumstances. Moreover, when providing an electrothermal body, what is necessary is just to be provided in the surface vicinity of a joining area | region, and it may be embedded in a joining area | region and may be stuck on the surface of a joining area | region.

  The shape of the electric heating element is also arbitrary. For example, a plurality of linear heating wires are arranged in parallel so as to be parallel to the edge of the joining region, a single heating wire is arranged in a zigzag pattern, It may be possible to dispose a heating wire in the form of a wire or a heating element in the form of a flat cable over the entire joining region.

  Here, in order to improve the thermal welding action of the waterproof sheet for tunnels, a low melting point welding material is provided in at least one of the first and second joining regions, and the first and second layers are interposed via the low melting point welding material. The joining region is configured to be heat-welded.

  If it does in this way, since a low melting-point welding material fuse | melts also at comparatively low temperature, combined with melting | fusing of the waterproof sheet | seat for tunnels itself, more reliable heat welding is attained.

  The low melting point welding material only needs to be made of a material lower than the melting point of the tunnel waterproof sheet, and it does not matter whether the low melting point welding material is provided in both the first and second joining regions.

  Further, instead of providing the low melting point welding material, a predetermined protrusion is provided in one of the first and second bonding regions, and a predetermined groove-shaped recess is provided in the other bonding region. The protrusion may be formed so that the protrusion is fitted into the groove-shaped recess, and the heating element may be embedded in the protrusion along the material axis direction of the protrusion.

  In this case, in addition to the bonding force by the thermal welding using the electric heating element embedded in the vicinity of the surface of at least one of the first and second bonding regions and the electric heating element embedded in the protrusion, Due to the fitting force caused by fitting in the groove-shaped recess, higher water tightness and bonding force are ensured in the bonding region of the tunnel waterproof sheet.

  The projecting body is provided so as to be parallel to the edge of the joining region, is formed so as to be fitted into the groove-shaped recess, and has any electric heater embedded along the material axis direction. For example, the tip section is a circular section and the base section is a rectangular section having a width smaller than the outer diameter of the circle so that the tip section is larger than the base section. Can be considered.

  The groove-shaped recess is provided so as to be parallel to the edge of the joining region, and if the protrusion is formed so as to be fitted in the groove-shaped recess, the configuration may be arbitrary. is there. The groove-shaped recess is not necessarily limited to a form embedded in the cross section in the thickness direction of the tunnel waterproof sheet, and may be formed so as to protrude from the tunnel waterproof sheet. In the latter configuration, the first and second joining regions are not in contact with each other, but there is no change in maintaining watertightness. In other words, the superposition referred to in the present invention does not only mean that the first and second joining regions maintain the contact state, but also includes the non-contact state as long as they are joined with a predetermined overlap width. Shall.

  It should be noted that it is arbitrary which of the first and second joining regions is provided with the projecting body and the groove-shaped recess, and the projecting body is provided in the first joining region and the groove shape is formed in the second joining region. A concave portion may be provided, or a groove-like concave portion may be provided in the first joint region and a protrusion may be provided in the second joint region.

  Moreover, although it is necessary for the protrusions and the groove-shaped recesses to be the same number, the number of the sets is arbitrary, and one row may be provided or a plurality of rows may be provided.

  Moreover, in the joining method of the waterproof sheet for tunnels concerning invention of Claim 3, while forming a 1st joining area | region on the surface along a predetermined | prescribed edge part, it is in the edge part located on the opposite side to the said edge part. A tunnel waterproof sheet formed by forming a second bonding region on the back surface along the tunnel waterproof sheet for bonding the first and second bonding regions so as to overlap each other. First, the first and second bonding regions are overlapped with each other.

  Next, while applying pressure to the first and second bonding regions in such a state, an electric current is embedded in the vicinity of the surface of at least one of the first and second bonding regions. The first and second joining regions are thermally welded.

  Here, in order to further improve the thermal welding action of the waterproof sheet for tunnels, the low melting point welding material provided in at least one of the first and second joining regions is melted together with the first and second joining regions. .

  In addition, since the structure of an electrothermal body and a low melting-point welding material is the same as that of Claim 1, the description is abbreviate | omitted here.

  Moreover, in the joining method of the waterproof sheet for tunnels which concerns on invention of Claim 4, while forming a 1st joining area | region on the surface along a predetermined | prescribed edge part, it is in the edge part located on the opposite side to the said edge part. A tunnel waterproof sheet formed by forming a second bonding region on the back surface along the tunnel waterproof sheet for bonding the first and second bonding regions so as to overlap each other. First, of the first and second joining regions, a predetermined protrusion provided in one joining region so as to be parallel to the edge of the joining region is provided, and the edge of the joining region is provided in the other joining region. It fits into a predetermined groove-like recess provided so as to be parallel to the portion.

  In fitting, the protrusion is aligned with the groove-shaped recess, and then the protrusion is pushed into the groove-shaped recess.

  Next, while applying pressure to the first and second bonding regions in such a state, an electric current is embedded in the vicinity of the surface of at least one of the first and second bonding regions. Melting the joining region and energizing an electric heating element embedded in the projecting body along the material axis direction of the projecting body to melt the projecting body, Heat weld.

  Since the structure of the protrusion, the groove-shaped recess, and the electric heating element is the same as that of the first and third aspects, the description thereof is omitted here.

  The tunnel waterproof sheet according to claims 1 to 4 can be applied to all tunnels that require waterproofing, such as shield tunnels, mountain tunnels, and open tunnels. .

  Further, as a mode of joining the tunnel waterproof sheets according to the inventions of claims 1 to 4, first, the first joining region and the second joining region formed on the same tunnel waterproof sheet are overlapped with each other. In addition, a mode in which one tunnel waterproof sheet is joined in an annular shape is conceivable. As an example of such a configuration, for example, a case where the shield tunnel is attached to the inner surface of the shield tunnel so as to surround the inner space of the shield tunnel having a relatively small cross section is applicable.

  Next, as a second mode, a tunnel waterproof sheet formed with a first bonding region is overlapped with a second bonding region formed on another tunnel waterproof sheet different from the tunnel waterproof sheet. Thus, a form in which two tunnel waterproof sheets are joined to each other is conceivable, and such a form further includes a case in which the tunnel waterproof sheet is joined so as to surround the inner space of the tunnel or so as to surround the tunnel housing. It is roughly divided into two cases when joining along the axial direction of the tunnel.

  As an example of the former, for example, a shield tunnel or a mountain tunnel corresponds to a case where a plurality of tunnel waterproof sheets are joined one after another so as to surround the inner space of the tunnel having a large cross section. . When excavating a mountain tunnel with a large cross section by a bench cut method, the waterproof sheets for tunnels are sequentially joined after completion of excavation within a predetermined range.

  As an example of the latter, for example, a shield tunnel or a mountain tunnel, a case where a plurality of tunnel waterproof sheets are joined one after another along the axial direction of the tunnel in consideration of the tunneling speed.

  Moreover, the waterproof sheet for tunnels should just be comprised with the material which has waterproofness, and although it is not ask | required what kind of shape, it is possible to comprise with a rectangular planar resin sheet, for example.

  Also, how to set the joining region is arbitrary, for example, in the case where the tunnel waterproof sheet is configured in a rectangular flat shape, the edge of the tunnel waterproof sheet in the short or long direction Are formed so that the first and second bonding regions are parallel to each other.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a waterproof sheet for a tunnel and a joining method thereof according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a diagram showing a tunnel waterproof sheet 1 according to the first embodiment. As shown in the plan view of FIG. 1 (a), the tunnel waterproof sheet 1 according to this embodiment is formed of a rectangular planar resin sheet, and is formed on the edge 2 in the longitudinal direction of the tunnel waterproof sheet. A first bonding region 3 having a overlapping width W along the surface and a second bonding region having a similar overlapping width W along the longitudinal edge 4 located on the opposite side of the edge 2 5 is formed on the back surface, and the first bonding region 3 and the second bonding region 5 are configured to be parallel to each other.

  Here, the tunnel waterproof sheet 1 is configured so that the first bonding region 3 and the second bonding region 5 are overlapped and bonded to each other, and the first bonding region 3 includes the bonding region. Two rows of protrusions 6 are provided so as to be parallel to the edge 2, and two rows of groove-like recesses 7 are provided in the second joining region 5 so as to be parallel to the edge 4 of the joining region. The groove-shaped recess 7 is formed so that the protrusion 6 is fitted into the groove-shaped recess.

  As can be clearly seen from the cross-sectional view shown in FIG. 4B, the protrusion 6 has a circular cross-section at the tip and a width smaller than the outer diameter of the circle so as to be fitted into the groove-shaped recess 7. The rectangular cross section is formed.

  The groove-like recess 7 is formed so that the protrusion 6 is fitted into the groove-like recess 7 as can be seen from the cross-sectional view shown in FIG. Here, the groove-like recess 7 is formed so as to protrude from the tunnel waterproof sheet 1 for the convenience of the sheet thickness.

  As shown in FIGS. 2 (a) and 2 (b), adhesive 9 is applied to the outer surface of the protrusion 6 and the inner surface of the groove-shaped recess 7 in advance at the factory, and a protective seal 8 is attached to the applied surface. It is.

  The protective seal 8 is for protecting the application surface of the adhesive 9 until the tunnel waterproof sheet 1 is joined, and is configured to be peelable so that the application surface can be exposed at the time of joining.

  In joining the waterproof sheet for tunnel 1 according to the present embodiment, a single waterproof sheet for tunnel 1 is attached in an annular shape along the inner surface of the tunnel, and both the edge portions are overlapped and joined together. Although another tunnel waterproof sheet 1 may be joined to the tunnel waterproof sheet 1, the former case will be described in the present embodiment.

  3A and 3B are views showing a state in which the tunnel waterproof sheet 1 according to the present embodiment is applied to a shield tunnel. FIG. 3A is a cross-sectional view seen from the tunnel axis direction, and FIG. It is sectional drawing containing the tunnel axis line along -C line | wire. In the case shown in the figure, a single waterproof sheet for tunnel 1 is attached in a ring shape along the inner peripheral surface of the tunnel and joined along the tunnel axis direction.

  In order to join the tunnel waterproof sheet 1 as shown in the figure, first, a natural ground 11 is excavated with a shield (not shown), and as a primary lining, assembling and backfilling segments 12 within the tail of the shield After injecting 13, the waterproofing sheet for tunnel 1 is attached along the inner peripheral surface of the segment 12, but when joining the two edges, the protective seal 8 is first removed and the adhesive 9 is removed. Expose.

  Next, as shown in FIG. 4, the protrusions 6 and 6 are aligned with the groove-like recesses 7 and 7, and then the protrusions 6 and 6 are pushed into the groove-like recesses 7 and 7 to fit both. To do.

  When the protrusions 6 and 6 are fitted into the groove-like recesses 7 and 7, the first bonding region 3 and the second bonding region 5 are not in contact with each other as can be seen in FIG. 4B. Further, since the protrusions 6 and 6 and the groove-like recesses 7 and 7 are provided in two rows, a space 21 is generated between the two rows when the protrusions are fitted in the groove-like recesses 7 and 7. However, the space 21 may be used as a pneumatic groove for joining inspection.

  As described above, according to the tunnel waterproof sheet 1 and the bonding method thereof according to the present embodiment, the protrusions 6 and 6 are provided in the first bonding region 3 and the groove shape is formed in the second bonding region 5. Since the recesses 7 and 7 are provided and the groove-like recesses are formed so that the protrusions 6 and 6 are fitted into the groove-like recesses, the protrusions 6 and 6 are provided with the groove-like recesses 7 and 6. 7 and firmly attached to the contact surface between the protrusions 6 and 6 and the groove-like recesses 7 and 7 by an adhesive 9 applied in advance. Therefore, the first joining region 3 and the second joining region 5 can be joined with high water tightness and adhesive force without using a conventional heat welding facility.

  In addition, since the adhesive 9 is applied to the outer surfaces of the protrusions 6 and 6 and the inner surfaces of the groove-shaped recesses 7 and 7 and the protective seal 8 is detachably attached to the application surface, the waterproof sheet for tunnel 1 is manufactured. In doing so, it becomes possible to apply the adhesive 9 at the factory, so that the application work of the adhesive on the site becomes unnecessary, and the reliability and quality of the adhesive force are improved.

  In the present embodiment, the tunnel waterproof sheet 1 according to the present invention is applied to a shield tunnel, but the present invention is not limited to such a tunnel, and is applicable to all tunnels that require waterproofing, such as mountain tunnels and open tunnels. Can be applied.

  Moreover, in this embodiment, the 1st joining waterproof region 1 and the 2nd joining region 5 which were formed in the same waterproofing sheet 1 for tunnels mutually overlap, and the one waterproofing sheet 1 for tunnels becomes cyclic | annular. In the first joining region 3 formed on the tunnel waterproof sheet 1 that has been previously constructed, the second waterproof waterproof sheet 1 that is different from the tunnel waterproof sheet 1 is formed. Alternatively, the two waterproof regions 1 and 1 may be bonded to each other by overlapping the bonding regions 5.

  5 and 6 show a case where the tunnel waterproof sheet 1b is joined to the tunnel waterproof sheet 1a that has been previously constructed. The tunnel waterproof sheets 1a and 1b have the same configuration as that of the tunnel waterproof sheet 1, and in the following description, a reference character indicating each part of the tunnel waterproof sheet 1 is denoted by a and b. The waterproof sheet 1a for tunnel and the waterproof sheet 1b for tunnel shall be distinguished.

  In order to join the tunnel waterproof sheet 1b to the tunnel waterproof sheet 1a that has been previously constructed, as in the above-described embodiment, first, the protective seal 8a attached to the ridges 6a and 6a is peeled off and the adhesive 9a is removed. And the protective seal 8b attached to the groove-like recesses 7b, 7b is peeled off to expose the adhesive 9b.

  Next, the groove-like recesses 7b and 7b of the tunnel waterproof sheet 1b are pushed into and fitted into the protrusions 6a and 6a of the tunnel waterproof sheet 1a.

  In this way, the same effects as the above-described embodiment can be obtained, but the description thereof is omitted here.

  In the present embodiment, the protrusions 6 are provided in the first joining region 3 and the groove-like recesses 7 are provided in the second joining region 5. However, the protrusions and the groove-like recesses are respectively provided in the first joining region 3. In addition, it is arbitrary which of the second bonding regions is provided, and a groove-like recess may be provided in the first bonding region and a protrusion may be provided in the second bonding region.

  Further, in this embodiment, the groove-shaped recess 7 is formed so as to protrude from the tunnel waterproof sheet 1, but instead, it is formed in a form embedded in the cross section in the thickness direction of the tunnel waterproof sheet 1. It doesn't matter.

  Moreover, in this embodiment, although the adhesive agent 9 was apply | coated to both the outer surface of the protrusion 6 and the inner surface of a groove-shaped recessed part, if the adhesive force when it fits can be ensured, the adhesive agent 9 It does not matter which one is applied.

  In the present embodiment, the adhesive 9 is applied in advance at the factory, and the applied surface is covered with the protective seal 8. Instead, the protrusion is fitted into the groove-like recess. The adhesive may be applied on site immediately before.

  In the case of such on-site application, not the tunnel waterproof sheet 1 to which the adhesive 9 has been applied in advance, but the tunnel waterproof sheet 31 in which the adhesive 9 and the protective seal 8 adhered to the application surface are omitted are used. To do. The tunnel waterproof sheet 31 has the same configuration as the tunnel waterproof sheet 1 except that the adhesive 9 and the protective seal 8 are omitted, as shown in FIG. The same parts as those of each part are denoted by the same reference numerals and the description thereof is omitted.

  To attach the tunnel waterproof sheet 31 in a ring shape along the inner surface of the tunnel, for example, and to overlap and join both edges, first, the outer surfaces of the protrusions 6 and 6 of the tunnel waterproof sheet 31 and the groove-shaped recess 7 , 7 is applied to the inner surface of at least one of the inner surfaces, and the protrusions 6 and 6 are aligned with the groove-like recesses 7 and 7, and the protrusions 6 and 6 are then aligned with the groove-like recesses 7 and 7. 7 and then both are fitted.

  About the effect by this structure and the point which can join another waterproofing sheet 31 for tunnels to the waterproofing sheet 31 for prior construction, since it is substantially the same as the above-mentioned embodiment, about the contents The description is omitted here.

(Second Embodiment)

  Next, a tunnel waterproof sheet and a joining method thereof according to the second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 8 is a diagram showing a tunnel waterproof sheet 41 according to the second embodiment. As shown in the plan view of FIG. 5A, the tunnel waterproof sheet 41 according to the present embodiment is formed of a rectangular planar resin sheet, as in the first embodiment. A first joining region 3 having an overlap width W along the longitudinal edge 2 is formed on the surface, and a similar overlap width W along the longitudinal edge 4 located on the opposite side of the edge 2. A second bonding region 5 having a surface is formed on the back surface, and the first bonding region 3 and the second bonding region 5 are configured to be parallel to each other.

  Here, the tunnel waterproof sheet 41 is configured so that the first bonding region 3 and the second bonding region 5 are overlapped and bonded to each other, and the first bonding region 3 includes the bonding region. Two rows of protrusions 42 are provided so as to be parallel to the edge 2, and two rows of groove-like recesses 7 are provided in the second joining region 5 so as to be parallel to the edge 4 of the joining region. The groove-shaped recess 7 is formed so that the protrusion 42 is fitted into the groove-shaped recess.

  As can be seen from the cross-sectional view shown in FIG. 4B, the protrusion 42 has a circular cross section at the tip and a base at the base so as to be fitted into the groove-like recess 7 as in the first embodiment. It is formed so as to have a rectangular cross section with a width smaller than the outer diameter of the.

  Here, when the protrusion 42 is formed with a hollow space 43 along which the hardening agent is filled along the material axis direction of the protrusion, the hardening agent is press-filled into the hollow space. It is configured to expand due to the internal pressure of the curing agent.

  The groove-like recess 7 is formed so that the protrusion 42 is fitted into the groove-like recess 7 as in the first embodiment, as can be seen from the cross-sectional view shown in FIG. . Here, the groove-shaped recess 7 is formed so as to protrude from the tunnel waterproof sheet 41 for convenience of sheet thickness.

  In joining the waterproof sheet for tunnel 41 according to the present embodiment, a single waterproof sheet for tunnel 41 is attached in an annular shape along the inner surface of the tunnel, and both the edges are joined together, and prior construction was performed. In some cases, another tunnel waterproof sheet 41 may be joined to the tunnel waterproof sheet 41. In the present embodiment, the former case will be described.

  When the tunnel waterproof sheet 41 according to the present embodiment is applied to a shield tunnel, a single tunnel waterproof sheet 41 extends along the inner peripheral surface of the tunnel, as described in FIG. 3 of the first embodiment. It is attached in a ring shape and joined along the tunnel axis direction.

  As in FIG. 3, in order to join the tunnel waterproof sheet 41, first, the ground 11 is excavated with a shield (not shown), and the segment 12 is assembled and backfilled in the tail of the shield as a primary lining. After injecting 13, a waterproof sheet for tunnel 41 is attached along the inner peripheral surface of the segment 12, and when joining the two edge portions, as shown in FIG. The protrusions 42 and 42 are aligned with the groove-like recesses 7 and 7, and then the protrusions 42 and 42 are pushed into the groove-like recesses 7 and 7 to fit them together.

  Next, as shown in FIG. 5B, a hardening agent 44 is press-fitted into the hollow space 43 formed in the protrusions 42 along the material axis direction of the protrusions 42, 42, and the hardening agent The protrusions 42 and 42 are expanded by the internal pressure.

  As the curing agent 44, for example, an epoxy resin can be used.

  In addition, when injecting the curing agent 44, it may be press-fitted using a hand pump or the like.

  Next, the curing agent 44 is cured while maintaining this state.

  In this way, as shown in FIG. 10, the protrusion 42 is expanded in the groove-like recess 7 by the internal pressure of the curing agent 44 press-fitted into the hollow space 43 of the protrusion, and is cured in this state. The agent 44 is cured, and the first joining region 3 and the second joining region 5 of the waterproof sheet 41 for the tunnel are determined by the fitting force of the projecting body 42 and the groove-like recess 7 and the expansion pressure of the projecting body 42. In addition, high water tightness and bonding strength are ensured.

  In addition, when the protrusions 42 and 42 are fitted into the groove-like recesses 7 and 7, the first joining region 3 and the second joining region 5 are not in contact with each other as can be seen in FIG. 9B. Further, since the protrusions 42 and 42 and the groove-like recesses 7 and 7 are provided in two rows, a space 21 is generated between the two rows when the protrusions are fitted in the groove-like recesses 7 and 7. However, the space 21 may be used as a pneumatic groove for joining inspection.

  As described above, according to the tunnel waterproof sheet 41 and the joining method thereof according to the present embodiment, the hollow space 43 for filling the hardener 44 into the protrusions 42 and 42 is formed in the protrusions 42. Since the protrusions 42 and 42 are formed so as to be formed along the material axis direction and expand by the internal pressure of the hardening agent when the hardening agent 44 is press-fitted into the hollow space, the protrusions 42 and 42 are configured. 42 and 42 expand in the groove-like recesses 7 and 7 due to the internal pressure of the curing agent 44 press-fitted into the hollow space 43 of the projecting body, and the curing agent 44 is cured in such a state. Even without using such a heat welding equipment, the first joining of the waterproof sheet 41 for the tunnel is achieved by the fitting force of the protrusions 42 and 42 and the groove-like recesses 7 and 7 and the expansion pressure of the protrusions 42 and 42. High water tightness and bonding strength in the region 3 and the second bonding region 5 It can be coercive.

  In the present embodiment, the tunnel waterproof sheet 41 according to the present invention is applied to a shield tunnel, but the present invention is not limited to such a tunnel, and is applicable to all tunnels that require waterproofing, such as mountain tunnels and open tunnels. Can be applied.

  Further, in the present embodiment, the first bonding region 3 and the second bonding region 5 formed on the same tunnel waterproof sheet 41 are overlapped with each other so that one tunnel waterproof sheet 41 becomes annular. However, in the first joint region 3 formed on the tunnel waterproof sheet 41 that has been previously constructed, the second waterproof waterproof sheet 41 that is different from the tunnel waterproof sheet 41 is formed. The two waterproof areas 41, 41 may be bonded to each other by superimposing the bonding areas 5 of the two.

  FIG. 11 shows a case where the tunnel waterproof sheet 41b is joined to the tunnel waterproof sheet 41a that has been previously constructed. The tunnel waterproof sheets 41a and 41b have the same configuration as that of the tunnel waterproof sheet 41. In the following description, the reference numerals indicating the respective parts of the tunnel waterproof sheet 41 are denoted by a and b. The waterproof sheet 41a for tunnel and the waterproof sheet 41b for tunnel shall be distinguished.

  In order to join the tunnel waterproof sheet 41b to the tunnel waterproof sheet 41a that has been constructed in advance, first, the groove-shaped recesses 7b and 7b of the tunnel waterproof sheet 41b are protruded from the tunnel waterproof sheet 41a, as in the above-described embodiment. The strips 42a and 42a are pushed in and fitted.

  Next, the curing agent 44 is press-fitted into the hollow space 43a formed in the projecting body along the material axis direction of the projecting body 42a, 42a, and the projecting body 42a, 42a is attached by the internal pressure of the curing agent. Inflate.

  In order to press-fill the hardener 44 into the hollow space 43a formed in the protrusion 42a, for example, it is formed in the protrusion 42a of the tunnel waterproof sheet 41a from the surface of the tunnel waterproof sheet 41b. Drilling with a drill or the like so as to penetrate to the hollow space 43a, and the curing agent 44 may be press-fitted using the hole formed by the drilling. In addition, if necessary, an air vent hole may be drilled at another location in the same procedure, and after filling is confirmed, the air vent hole is closed to perform the pressurizing operation.

  Next, the curing agent 44 is cured while maintaining this state.

  In this way, the same effects as the above-described embodiment can be obtained, but the description thereof is omitted here.

  Further, in the present embodiment, the protrusions 42 and 42 are provided in the first joining region 3 and the groove-like recesses 7 and 7 are provided in the second joining region 5. In each of the first and second joining regions, it is arbitrary, and a groove-like recess may be provided in the first joining region and a protrusion may be provided in the second joining region. .

  In this embodiment, the groove-shaped recess 7 is formed so as to protrude from the tunnel waterproof sheet 41. Instead, it is formed in a form embedded in the cross section in the thickness direction of the tunnel waterproof sheet 41. It doesn't matter.

(Third embodiment)

  Next, a tunnel waterproof sheet and a joining method thereof according to the third embodiment will be described. Note that components substantially the same as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 12 is a diagram showing a tunnel waterproof sheet 51 according to the third embodiment. As shown in the plan view of FIG. 5A, the tunnel waterproof sheet 51 according to the present embodiment is formed of a rectangular planar resin sheet as in the first embodiment. A first joining region 3 having an overlap width W along the longitudinal edge 2 is formed on the surface, and a similar overlap width W along the longitudinal edge 4 located on the opposite side of the edge 2. A second bonding region 5 having a surface is formed on the back surface, and the first bonding region 3 and the second bonding region 5 are configured to be parallel to each other.

  In the vicinity of the surface of the first bonding region 3, as can be seen from the cross-sectional view shown in FIG. As shown in FIG.

  In the vicinity of the surface of the second bonding region 5, a linear heating wire 52 is parallel to the edge 4 of the bonding region as an electric heating body, as can be seen from the cross-sectional view shown in FIG. As shown in FIG.

  That is, the tunnel waterproof sheet 51 causes the first bonding region 3 and the second bonding region 5 to be connected to each other by energizing the heating wire 52 provided near the surfaces of the first bonding region 3 and the second bonding region 5. It is configured so that it can be heat-welded in a superposed state.

  Here, a low melting point welding material 53 having the same width as the overlap width W is laminated on the first bonding region 3 and the second bonding region 5, and the first bonding region 3 is interposed via the low melting point welding material. And the 2nd joining area | region 5 can be heat-welded now.

  The low melting point welding material 53 is made of a material lower than the melting point of the tunnel waterproof sheet 51.

  In joining the waterproof sheet for tunnel 51 according to the present embodiment, a single waterproof sheet for tunnel 51 is attached in an annular shape along the inner surface of the tunnel, and both the edge portions are overlapped and joined in advance. In some cases, another tunnel waterproof sheet 51 is joined to the tunnel waterproof sheet 51. In the present embodiment, the former case will be described.

  When the tunnel waterproof sheet 51 according to the present embodiment is applied to a shield tunnel, a single tunnel waterproof sheet 51 extends along the inner peripheral surface of the tunnel, as described in FIG. 3 of the first embodiment. It is attached in a ring shape and joined along the tunnel axis direction.

  As in FIG. 3, in order to join the waterproof sheet 51 for the tunnel, first, the ground 11 is excavated with a shield (not shown) and the assembly and backfilling material of the segment 12 in the tail of the shield is performed as a primary lining. After injecting 13, the waterproofing sheet 51 for tunnels is attached along the inner peripheral surface of the segment 12, and when joining the both edge portions in an overlapping manner, as shown in FIG. The first bonding region 3 and the second bonding region 5 are overlapped with each other.

  Next, a power source (not shown) is connected to the heating wire 52 provided near the surface of the first bonding region 3 and the second bonding region 5 to energize the first bonding region 3 and the second bonding region 5. While melting together with the low melting point welding material 53 provided in the first bonding region 3 and the second bonding region 5, the first bonding region 3 and the second bonding region as shown in FIG. By applying pressure to 5, the first bonding region 3 and the second bonding region 5 are thermally welded.

  In addition, what is necessary is just to use a hand roller etc. in welding, carrying a pressure.

  As described above, according to the tunnel waterproof sheet 51 and the bonding method thereof according to the present embodiment, the heating wire 52 is embedded in the vicinity of the surfaces of the first bonding region 3 and the second bonding region 5 and the low melting point. Since the welding material 53 is provided, the first heating region 3 and the second bonding region 5 are superposed on each other, and the heating wire 52 is energized, so that not only the bonding region where the heating wire 52 is embedded, The low melting point welding material 53 having a low heating temperature because it is separated from the heat wire 52 is also melted, and the first joining region 3 and the second joining region 5 are reliably integrated by the melting action of both, thus. Even without using a conventional heat welding facility, high water tightness and bonding strength can be ensured in the bonding region of the tunnel waterproof sheet 51.

  In the present embodiment, the tunnel waterproof sheet 51 according to the present invention is applied to a shield tunnel, but the present invention is not limited to such a tunnel, and is applicable to all tunnels that require waterproofing, such as mountain tunnels and open tunnels. Can be applied.

  In the present embodiment, the first bonding region 3 and the second bonding region 5 formed on the same tunnel waterproof sheet 51 are overlapped with each other so that one tunnel waterproof sheet 51 is formed into an annular shape. In the first joining region 3 formed on the tunnel waterproof sheet 51 that has been previously constructed, the second waterproof waterproof sheet 51 that is different from the tunnel waterproof sheet 51 is formed. Alternatively, the two waterproof areas 51, 51 may be bonded to each other by superimposing the bonding areas 5 of the two.

  FIG. 14 shows a case where the tunnel waterproof sheet 51b is joined to the tunnel waterproof sheet 51a that has been previously constructed. The tunnel waterproof sheets 51a and 51b have the same configuration as that of the tunnel waterproof sheet 51. In the following description, a reference character indicating each part of the tunnel waterproof sheet 51 is denoted by a and b. The waterproof sheet 51a for tunnel and the waterproof sheet 51b for tunnel shall be distinguished.

  In order to join the tunnel waterproof sheet 51b to the tunnel waterproof sheet 51a that has been constructed in advance, first, the first joining region 3a of the tunnel waterproof sheet 51a and the tunnel waterproof sheet 51b Two joining regions 5b are overlapped with each other.

  Next, the heating wire 52a embedded in the vicinity of the surface of the first bonding region 3a and the heating wire 52b embedded in the vicinity of the surface of the second bonding region 5b are energized by connecting a power source (not shown) to the first bonding region. While melting the region 3a and the second bonding region 5b together with the low melting point welding material 53a provided in the first bonding region 3a and the low melting point welding material 53b provided in the second bonding region 5b, By applying pressure to the joining region 3a and the second joining region 5b, the first joining region 3a and the second joining region 5b are thermally welded.

  In this way, the same effects as the above-described embodiment can be obtained, but the description thereof is omitted here.

  In the present embodiment, the heating wire 52 is embedded as a heating element in the vicinity of the surfaces of the first bonding region 3 and the second bonding region 5, but the first and second bonding regions are overlapped with each other. If the first and second bonding regions can be melted in the combined state, the electric heating body may be embedded in only one bonding region.

  In the present embodiment, a plurality of linear heating wires 52 are arranged in parallel so as to be parallel to the edge of each joining region as the heating element. However, the shape of the heating element is not limited to this. Alternatively, for example, a single heating wire may be arranged in a zigzag pattern, or a net-like heating wire or a flat cable-shaped heating element may be arranged over the entire joining region.

  In the present embodiment, the low melting point welding material 53 is provided in both the first bonding region 3 and the second bonding region 5, but the first and second bonding regions are sufficiently welded. For example, either one of the low melting point welding materials may be provided.

  In this embodiment, the low melting point welding material 53 is provided in the first bonding region 3 and the second bonding region 5, but the first and second bonding regions are sufficiently heated by the heating action of the electric heater. If welding is possible, the low melting point welding material 53 may be omitted.

  The operational effects of this configuration are substantially the same as those of the above-described embodiment except that the low-melting point welding material 53 is omitted, and the description thereof is omitted here.

(Fourth embodiment)

  Next, a tunnel waterproof sheet and a joining method thereof according to the fourth embodiment will be described. Note that components that are substantially the same as those in the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 15 is a diagram showing a tunnel waterproof sheet 61 according to the fourth embodiment. As shown in the plan view of FIG. 5A, the tunnel waterproof sheet 61 according to the present embodiment is formed of a rectangular planar resin sheet, as in the first embodiment. A first joining region 3 having an overlap width W along the longitudinal edge 2 is formed on the surface, and a similar overlap width W along the longitudinal edge 4 located on the opposite side of the edge 2. A second bonding region 5 having a surface is formed on the back surface, and the first bonding region 3 and the second bonding region 5 are configured to be parallel to each other.

  In the vicinity of the surface of the first bonding region 3, as can be seen from the cross-sectional view shown in FIG. As shown in FIG.

  In the vicinity of the surface of the second bonding region 5, a linear heating wire 52 is parallel to the edge 4 of the bonding region as an electric heating body, as can be seen from the cross-sectional view shown in FIG. As shown in FIG.

  That is, the tunnel waterproof sheet 61 causes the first bonding region 3 and the second bonding region 5 to be connected to each other by energizing the heating wire 52 provided near the surfaces of the first bonding region 3 and the second bonding region 5. It is configured so that it can be heat-welded in a superposed state.

  Here, the tunnel waterproof sheet 61 is provided with two rows of protrusions 62 in the first joint region 3 so as to be parallel to the edge 2 of the joint region, and the second joint region 5. Are provided with two rows of groove-like recesses 7 so as to be parallel to the edge 4 of the joining region, and the groove-like recesses 7 are formed so that the protrusions 62 are fitted into the groove-like recesses. It is.

  As can be seen from the cross-sectional view shown in FIG. 5B, the protrusion 62 has a circular cross-section at the tip and a width smaller than the outer diameter of the circle so as to be fitted into the groove-like recess 7. And a heating wire 52, which is a heating element, is embedded in the vicinity of the center of the circular section along the material axis direction.

  The groove-like recess 7 is formed so that the protrusion 62 is fitted into the groove-like recess 7 as in the first embodiment, as can be seen from the cross-sectional view shown in FIG. . Here, the groove-shaped concave portion 7 is formed so as to protrude from the tunnel waterproof sheet 61 for the convenience of the sheet thickness.

  In joining the waterproof sheet 61 for tunnels according to the present embodiment, a single waterproof sheet 61 for tunnels is attached in an annular shape along the inner surface of the tunnel, and a case where the both edges are overlapped and joined is performed in advance. In some cases, another tunnel waterproof sheet 61 is joined to the tunnel waterproof sheet 61. In the present embodiment, the former case will be described.

  When the tunnel waterproof sheet 61 according to the present embodiment is applied to a shield tunnel, a single tunnel waterproof sheet 61 extends along the inner peripheral surface of the tunnel, as described in FIG. 3 of the first embodiment. It is attached in a ring shape and joined along the tunnel axis direction.

  In order to join the tunnel waterproof sheet 61 as shown in the figure, first, the ground 11 is excavated with a shield (not shown), and the segment 12 is assembled and backfilled in the tail of the shield as a primary lining. After injecting 13, the tunnel waterproof sheet 61 is attached along the inner peripheral surface of the segment 12, and when joining the two edge portions, as shown in FIG. The protrusions 62 and 62 provided in the first joining region 3 are aligned with the groove-like recesses 7 and 7 provided in the second joining region 5, and then the protrusions 62 and 62 are provided in the groove shape. It pushes into the recessed parts 7 and 7 and both are fitted.

  Next, a power source (not shown) is connected to the electric heating element 52 provided in the vicinity of the surfaces of the first bonding area 3 and the second bonding area 5 to energize the bonding area to melt the bonding area, and the protrusions 62 and 62 As shown in FIG. 4B, the electric heating element 52 embedded in the protrusion is connected to a power source (not shown) and energized to melt the protrusion. By applying pressure to the bonding region 3 and the second bonding region 5, the first bonding region 3 and the second bonding region 5 are thermally welded.

  In addition, what is necessary is just to use a hand roller etc. in welding, carrying a pressure.

  As described above, according to the tunnel waterproof sheet 61 and the bonding method thereof according to the present embodiment, the heating wires 52 are provided in the vicinity of the surfaces of the first bonding region 3 and the second bonding region 5. By energizing the heating wire 52 in a state where the first joining region 3 and the second joining region 5 overlap each other, the joining region provided with the heating wire 52 is melted. Therefore, the first joining region 3 and the second joining region 5 are integrated by thermal welding, and thus, without using a thermal welding facility as in the prior art, high water tightness and Bonding force can be ensured.

  Further, the protrusions 62 and 62 are provided in the first joining region 3, and the groove-like recesses 7 and 7 are provided in the second joining region 5. The groove-like recesses are formed as the groove-like recesses 62 and 62. Since the heating wire 52 is embedded in the protrusion 62, 62 along the material axis direction of the protrusion, the first bonding region 3 and the second bonding region are formed. In addition to the joining force by heat welding using the heating wire 52 provided in the vicinity of the surface 5 and the heating wire 52 embedded in the protrusions 62, 62, the protrusions 62, 62 are attached to the groove-like recesses 7, 7. It is possible to secure higher water tightness and bonding force in the bonding region of the tunnel waterproof sheet 61 by the fitting force by fitting.

  In the present embodiment, the tunnel waterproof sheet 61 according to the present invention is applied to a shield tunnel. However, the present invention is not limited to such a tunnel and is applicable to all tunnels that require waterproofing, such as mountain tunnels and open-cut tunnels. Can be applied.

  In the present embodiment, the first joining region 3 and the second joining region 5 formed on the same tunnel waterproof sheet 61 are overlapped with each other so that one tunnel waterproof sheet 61 is annular. In the first joining region 3 formed on the tunnel waterproof sheet 61 that has been previously constructed, the second waterproof waterproof sheet 61 that is different from the tunnel waterproof sheet 61 is formed. The two waterproof areas 61 and 61 for tunnels may be joined to each other by superimposing the joining areas 5.

  FIG. 17 shows a case where the tunnel waterproof sheet 61b is joined to the tunnel waterproof sheet 61a that has been previously constructed. The tunnel waterproof sheets 61a and 61b have the same configuration as that of the tunnel waterproof sheet 61. In the following description, a reference character indicating each part of the tunnel waterproof sheet 61 is denoted by a and b. The waterproof sheet 61a for tunnel and the waterproof sheet 61b for tunnel shall be distinguished.

  In order to join the tunnel waterproof sheet 61b to the tunnel waterproof sheet 61a that has been constructed in advance, first, the groove-shaped recesses 7b and 7b of the tunnel waterproof sheet 61b are protruded from the tunnel waterproof sheet 61a, as in the above-described embodiment. The strips 62a and 62a are pushed in and both are fitted.

  Next, the electric heating element 52a provided near the surface of the first bonding region 3a and the electric heating element 52b provided near the surface of the second bonding region 5b are connected to a power source (not shown) to energize the bonding region. While melting, the first heating body 52a embedded in the projecting body along the material axis direction of the projecting body 62a, 62a is connected to a power source (not shown) and energized to melt the first projecting body. By applying pressure to the joining region 3a and the second joining region 5b, the first joining region 3a and the second joining region 5b are thermally welded.

  In this way, the same effects as the above-described embodiment can be obtained, but the description thereof is omitted here.

  Further, in the present embodiment, the protrusions 62 and 62 are provided in the first joining region 3 and the groove-like recesses 7 and 7 are provided in the second joining region 5. In each of the first and second joining regions, it is arbitrary, and a groove-like recess may be provided in the first joining region and a protrusion may be provided in the second joining region. .

  In this embodiment, the groove-shaped recess 7 is formed so as to protrude from the tunnel waterproof sheet 61. Instead, it is formed in a form embedded in the cross section in the thickness direction of the tunnel waterproof sheet 61. It doesn't matter.

  In the present embodiment, the heating wire 52 is embedded as a heating element in the vicinity of the surfaces of the first bonding region 3 and the second bonding region 5, but the first and second bonding regions are overlapped with each other. As long as the first and second joining regions can be melted in the combined state, the electric heating element may be provided only in one joining region. Moreover, when providing an electrothermal body, you may make it stick on the surface of a joining area | region, without embedding in a joining area | region.

  In the present embodiment, a plurality of linear heating wires 52 are arranged in parallel in the first joining region 3 and the second joining region 5 so as to be parallel to the edge of each joining region. However, the shape of the heating element is not limited to this. For example, a single heating wire may be arranged in a zigzag pattern, or a net-like heating wire or a flat cable-shaped heating element may be arranged over the entire bonding area. It doesn't matter.

It is the figure which showed the waterproof sheet for tunnels which concerns on 1st Embodiment, (a) is a top view, (b) is a detailed cross-sectional view along the AA line of (a), (c) is B of (a). Sectional detail drawing which follows the -B line. It is the figure which showed the waterproof sheet for tunnels concerning 1st Embodiment, (a) is a cross-sectional detailed drawing of a groove-shaped recessed part, (b) is a cross-sectional detailed drawing of a protrusion body. It is the figure which showed a mode that the waterproof sheet for tunnels concerning 1st Embodiment was applied to the shield tunnel, (a) is sectional drawing seen from the tunnel axial direction, (b) is CC line of (a). Sectional drawing containing the tunnel axis line which follows. The perspective view which showed a mode that the waterproof sheet for tunnels concerning 1st Embodiment was joined. It is the figure which showed a mode that the waterproof sheet for tunnels concerning the modification of 1st Embodiment was applied to the shield tunnel, (a) is sectional drawing containing a tunnel axis line, (b) is the DD line of (a). Sectional drawing seen from the tunnel axis direction which followed. The perspective view which showed a mode that the waterproof sheet for tunnels which concerns on the modification of 1st Embodiment was joined. It is the figure which showed the waterproof sheet for tunnels which concerns on another modification of 1st Embodiment, (a) is a top view, (b) is sectional detail drawing which follows the EE line of (a), (c) is Sectional detail drawing which follows the FF line of (a). It is the figure which showed the waterproof sheet for tunnels concerning 2nd Embodiment, (a) is a top view, (b) is a detailed sectional view which follows the GG line of (a), (c) is H of (a). Sectional detail drawing which follows the -H line. The perspective view which showed a mode that the waterproof sheet for tunnels concerning 2nd Embodiment was joined. Sectional drawing which showed the effect | action of the waterproof sheet for tunnels concerning 2nd Embodiment. The perspective view which showed a mode that the waterproof sheet for tunnels concerning the modification of 2nd Embodiment was joined. It is the figure which showed the waterproof sheet for tunnels concerning 3rd Embodiment, (a) is a top view, (b) is a detailed sectional view which follows the II line | wire of (a), (c) is J of (a). -Sectional detail drawing which follows a J line. The perspective view which showed a mode that the waterproof sheet for tunnels concerning 3rd Embodiment was joined. The perspective view which showed a mode that the waterproof sheet for tunnels which concerns on the modification of 3rd Embodiment was joined. It is the figure which showed the waterproof sheet for tunnels which concerns on 4th Embodiment, (a) is a top view, (b) is sectional detail drawing which follows the KK line of (a), (c) is L of (a). Sectional detail drawing which follows the -L line. The perspective view which showed a mode that the waterproof sheet for tunnels concerning 4th Embodiment was joined. The perspective view which showed a mode that the waterproof sheet for tunnels which concerns on the modification of 4th Embodiment was joined.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31, 41, 51, 61 Waterproof sheet | seat for tunnels 2, 4 Edge part 3 1st joining area | region 5 2nd joining area | region 6, 42, 62 Projection body 7 Groove-shaped recessed part 8 Protective seal 9 Adhesive 43 Hollow Space 44 Curing agent 52 Heating wire (electric heating element)
53 Low melting point welding material

Claims (4)

A first bonding region is formed on the surface along a predetermined edge, and a second bonding region is formed on the back surface along an edge located on the side opposite to the edge, and the first and second In the tunnel waterproof sheet configured to join the joining regions of each other,
A state in which an electric heating body is embedded in the vicinity of the surface of at least one of the first and second bonding areas, and the first and second bonding areas are overlapped with each other by energizing the electric heating body. The low melting point welding material is provided in at least one of the first and second bonding regions, and the first and second bonding regions are heated via the low melting point welding material. A waterproof sheet for tunnels, characterized in that it can be welded. A first bonding region is formed on the surface along a predetermined edge, and a second bonding region is formed on the back surface along an edge located on the side opposite to the edge, and the first and second In the tunnel waterproof sheet configured to join the joining regions of each other,
A state in which an electric heating body is embedded in the vicinity of the surface of at least one of the first and second bonding areas, and the first and second bonding areas are overlapped with each other by energizing the electric heating body. In the first and second bonding regions, a predetermined protrusion is provided in one of the bonding regions so as to be parallel to the edge of the bonding region, and the other bonding is performed. A predetermined groove-shaped recess is provided in the region so as to be parallel to the edge of the joint region, and the groove-shaped recess is formed so that the protrusion is fitted into the groove-shaped recess. A waterproofing sheet for tunnels, characterized in that an electric heating body is embedded in the strip along the axial direction of the projection. A tunnel waterproof sheet in which a first bonding region is formed on a surface along a predetermined edge and a second bonding region is formed on a back surface along an edge located on the side opposite to the edge. In the joining method of the waterproof sheet for a tunnel for joining the first and second joining regions to each other,
The first and second bonding regions are overlapped with each other, and in this state, pressure is applied to the first and second bonding regions, and at least one of the first and second bonding regions is bonded. A low melting point welding material provided in at least one of the first and second joining regions while energizing the electric heating body embedded near the surface of the region to thermally weld the first and second joining regions Is melted together with the first and second joining regions. A method for joining a waterproof sheet for tunnels. A tunnel waterproof sheet in which a first bonding region is formed on a surface along a predetermined edge and a second bonding region is formed on a back surface along an edge located on the side opposite to the edge. In the joining method of the waterproof sheet for a tunnel for joining the first and second joining regions to each other,
Of the first and second joining regions, a predetermined protrusion provided in one joining region so as to be parallel to the edge of the joining region, and an edge of the joining region in the other joining region. Of the first and second bonding regions, while being fitted in a predetermined groove-shaped recess provided to be parallel to each other and loading pressure on the first and second bonding regions in such a state, Energizing the electric heating element embedded in the vicinity of the surface of at least one of the bonding regions to melt the bonding region and energizing the electric heating element embedded in the protrusions along the material axis direction of the protrusion Then, the protrusion is melted, and the first and second joining regions are thermally welded.

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