JP2009030241A - Water cutoff structure of earth retaining wall, and method of constructing water cutoff structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent interposition of foreign matter (water cutoff sheet) between an earth retaining wall and a main structure, and to positively transfer stress between the earth retaining wall and the main structure. <P>SOLUTION: There is provided a water cutoff structure 10 of the earth retaining wall 1, for watertightly sealing the earth retaining wall 1, which is available when the earth retaining wall 1 having a plurality of steel cores 3 embedded in a wall body 2 at intervals, is used in the main structure 35. The water cutoff structure is formed of: a water cutoff means 11 which is arranged on one wall surface 2a of the earth retaining wall 1, facing the main structure 35, for watertightly sealing an interval between the mutually adjacent cores 3 of the earth retaining wall 1; a coupling means 20 which watertightly couples the water cutoff means 11 with the core 3; and a water leading means 31 which is arranged in the water cutoff means 11, for collecting water acting on the earth retaining wall 1, and leading the water to a water storage section. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining structure for a retaining wall and a method for constructing the retaining structure, and more particularly to retaining a retaining wall that is effective when a retaining wall (such as an underground continuous wall) is used as an underground outer wall of a main body structure. The present invention relates to a structure and a construction method of a water stop structure.

  In general, when using a retaining wall (underground continuous wall, etc.) built in the ground as an underground outer wall of the main structure, rainwater or spring water leaking from the retaining wall acts on the main structure. In order to prevent the durability of the structure from being affected, a water stop structure is applied to the wall surface of the retaining wall to prevent leakage of water from the retaining wall from acting on the main body structure.

  As an example of a water stop structure for preventing water leakage from such a retaining wall, for example, in Patent Document 1, after the construction of the underground continuous wall, the ground on the front side of the underground continuous wall is excavated to continue underground. By exposing the wall surface of the wall, placing a waterproof sheet between the adjacent core flanges of the exposed wall surface, and bonding the end of the waterproof sheet to the surface of both flanges with a double-sided adhesive, A water stop structure configured to prevent water leakage from the wall is disclosed.

  However, in the water stop structure with such a structure, when the underground wall of the main body structure is constructed on the front side of the underground continuous wall, the underground wall and the flange of the core material of the underground continuous wall Since a foreign substance (water-stop sheet) is interposed between them, it is difficult to reliably transmit stress between the main body structure and the underground continuous wall.

  On the other hand, in patent document 2, a waterproof sheet is arrange | positioned between the side parts of the flange of the core material of an underground continuous wall, and an elastic body is fitted to the receiving part which provided the edge part of the waterproof sheet in the side part of the flange. The water stop structure comprised so that it may fix by this is disclosed.

  In the water stop structure having such a structure, since the waterproof sheet is not interposed on the surface of the flange of the core material, it is possible to reliably transmit stress between the main body structure and the underground continuous wall. .

However, since the end of the waterproof sheet is fixed to the side of the flange by fitting an elastic body to the receiving part, if the water pressure acting on the underground continuous wall is large, the waterproof sheet There is a possibility that the end of the detachment from the receiving part may impair the waterproofness of the waterproof sheet.
Japanese Patent Laying-Open No. 2005-307441 JP 2004-232285 A

  The present invention has been made in view of the above-described conventional problems, and can reliably transmit stress between a retaining wall (such as an underground continuous wall) and a main body structure, and for a long time. It aims at providing the construction method of the water-stopping structure of the earth-holding wall and the water-stopping structure which can water-stop a retaining wall (underground continuous wall etc.).

In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 is a soil retaining device for stopping the retaining wall when using a retaining wall in which a plurality of steel cores are embedded in the wall body at intervals. A water-stopping structure for a wall, the water-stopping means provided on a wall surface of the earth retaining wall on the main body structure side for stopping water between adjacent core members of the earth-holding wall, and the water-stopping means for the core It is characterized by comprising connecting means for watertightly connecting to the material, and water guiding means provided in the water stopping means for collecting water acting on the earth retaining wall and guiding the water to a water storage section.

  According to the water retaining structure for the retaining wall according to the present invention, the water between the adjacent core members of the wall surface on the main body structure side of the retaining wall is stopped by the water stopping means. In this case, no foreign matter (water stop means) is interposed between the surface of the core material and the main body structure, so that stress can be reliably transmitted between the earth retaining wall and the main body structure. In addition, the water stopping means is provided with water guiding means that collects water acting on the retaining wall and guides it to the water storage part, so that the water pressure acting on the retaining wall can be reduced, and the water retaining means can be reduced by the water pressure. Can be prevented from leaving.

  The invention according to claim 2 is the water retaining structure for the retaining wall according to claim 1, wherein the water retaining means is provided on a wall surface of the retaining wall on the main body structure side, The sheet-shaped first water-stop sheet that stops the wall surface between the adjacent core members, and the lower end of the wall on the main body structure side of the retaining wall, the entire wall surface of the lower end and the lower end It consists of the 2nd water stop sheet which stops water between a part and the bottom plate part of the said main body structure, and the 3rd water stop sheet which stops the surface of the bottom plate part of the said main body structure.

  According to the water retaining structure for the retaining wall according to the present invention, the adjacent core members of the wall surface on the main body structure side of the retaining wall are water-stopped by the first water stopping sheet, and the lower end of the wall surface on the main body structure side of the retaining wall. The whole part and between the lower end of the wall surface of the retaining wall and the bottom plate part of the main body structure are stopped by the second water stop sheet, and the surface of the bottom plate part of the main body structure is stopped by the third water stop sheet. Will be.

  The invention according to claim 3 is the water retaining structure for the earth retaining wall according to claim 2, wherein the connecting means includes an inner support member connected to a side portion of the core member, and a surface of the inner support member. An inner seal member that is polymerized, an outer seal member that is polymerized on the surface of the inner seal member, an outer support member that is polymerized on the surface of the outer seal member, the outer support member, the outer seal member, It comprises an inner seal member and a screw fastening body that integrally connects the inner support member, and the end portion of the first water-stop sheet is sandwiched and fixed between the inner seal member and the outer seal member in a watertight manner. It is characterized by that.

  According to the water stop structure of the earth retaining wall according to the present invention, the end of the first water stop sheet is sandwiched between the inner seal member and the outer seal member, and the end of the first water stop sheet is supported on the inner side in this state. By superposing the outer support member on the surface of the member, superposing the outer support member on the surface of the outer seal member, and connecting the outer support member, the outer seal member, the inner seal member, and the inner support member together by a screw fastening body, the inner seal The end portion of the first water stop sheet is sandwiched and fixed in a watertight manner between the member and the outer seal member.

  The invention according to claim 4 is the water retaining structure of the retaining wall according to claim 3, wherein the screw fastening body includes the outer support member, the outer seal member, the inner seal member, and the inner support member. And a fastening nut that is screwed onto a tip portion protruding from the inner support member of the fastening screw.

  According to the water retaining structure of the earth retaining wall according to the present invention, the fastening screw is passed through the outer support member, the outer seal member, the inner seal member, and the inner support member, and fastened to the distal end portion of the fastening screw protruding from the inner support member. By screwing the nut, the outer support member, the outer seal member, the inner seal member, and the inner support member are integrally connected, and the end portion of the first water blocking sheet is between the outer seal member and the inner seal member. It will be pinched and fixed tightly.

  The invention according to claim 5 is the water retaining structure for the retaining wall according to claim 4, wherein an auxiliary seal member that seals the penetration portion of the fastening screw is superposed on the surface side of the outer support member. It is characterized by being.

  According to the water retaining structure of the earth retaining wall according to the present invention, the penetration portion of the fastening screw of the outer support member is sealed by the auxiliary seal member that is superposed on the surface side of the outer support member.

  The invention according to claim 6 is the water retaining structure for the retaining wall according to claim 5, wherein an auxiliary nut that presses the auxiliary seal member against the surface of the outer support member is screwed onto the fastening screw. It is characterized by.

  According to the water retaining structure of the earth retaining wall according to the present invention, by tightening the auxiliary nut, the auxiliary seal member is pressed against the surface of the outer support member, and the penetration portion of the fastening screw of the outer support member is sealed.

  The invention according to claim 7 is the retaining wall water stop structure according to any one of claims 2 to 6, wherein the second water stop sheet interposes the lower end portion of the first water stop sheet inside. In a state where the bottom wall of the earth retaining wall is connected to the lower end portion of the retaining wall in a watertight manner and the upper end portion is folded back to the surface side of the bottom plate portion of the main body structure, It is characterized by being integrally connected to the watertight.

  According to the water retaining structure for a retaining wall according to the present invention, the entire wall surface at the lower end portion of the retaining wall and the space between the lower end portion of the retaining wall and the bottom plate portion of the main body structure are stopped by the second water stopping sheet. It will be.

  According to an eighth aspect of the present invention, there is provided a retaining wall for stopping the retaining wall when a retaining wall in which a plurality of steel core members are embedded at intervals in the wall body is used for a main body structure. A method for constructing a water stop structure, wherein after the construction of the retaining wall, the wall surface of the retaining structure wall on the main body structure side is shaved to expose the surface of the core material and attached to the side of the core material in advance. The step of exposing the surface of the supporting member that has been placed, and the both ends of the first water-stop sheet on which the water guide member has been attached in advance on the back side are sandwiched between a pair of seal members, and in this state the first water-stop The both ends of the sheet are superposed on the surface side of the support member, and the support member paired with the support member is superposed on the surface side of the outer seal member, and the outer support member, the outer seal member, the first Fastening screw to water stop sheet, inner seal member, and inner support member A step of watertightly connecting an end portion of the first waterstop sheet to a side portion of the core member by passing through and fastening a fastening nut to the fastening screw, and the main body structure of the earth retaining wall A second water stop sheet is disposed on the entire wall surface of the lower end portion facing the bottom plate portion of the first water stop sheet, and the lower end portion of the first water stop sheet is interposed inside the lower end portion of the second water stop sheet. A third water-stop sheet that is joined to the wall surface of the lower end portion in a water-tight manner, the upper end portion of the second water-stop sheet is folded back onto the surface of the bottom plate portion of the main body structure, and is disposed on the surface of the bottom plate portion And a step of integrally joining in a watertight manner.

  The invention according to claim 9 is the construction method of the water stop structure of the retaining wall according to claim 8, wherein the protective material that closes the penetration portion of the fastening screw is peelable on the surface side of the inner support member A fastening nut is bonded to a portion corresponding to a through-hole of the fastening screw on the back side of the inner support member, and the surface of the fastening nut is covered with a covering material, and in this state, the core material Is installed in the construction site of the retaining wall, and after the filler is solidified by placing the filler in the construction site, the surface of the inner support member is scraped off the wall surface on the main body structure side of the retaining wall. The side is exposed.

  According to the construction method of the water retaining structure of the retaining wall according to the present invention, the protective material that closes the penetration portion of the fastening screw is detachably attached to the surface side of the inner support member, and the back surface side of the inner support member is peeled off. A fastening nut is adhered to the part corresponding to the penetration part of the fastening screw, and the surface of the fastening nut is covered with a coating material. Therefore, the core material is built in the construction site of the earth retaining wall and the filling material is applied to the construction site. Even if it is provided, the filler does not go around the penetration portion of the fastening screw of the inner support member and hinder the penetration of the fastening screw. Further, the filler does not go around the screw hole of the fastening nut and hinder the screwing of the fastening screw into the screw hole of the fastening nut.

  As described above, according to the water retaining structure of the retaining wall and the construction method of the water retaining structure of the present invention, foreign matter (water retaining means (first water stopping means (first Since the water blocking sheet)) is not interposed, stress can be reliably transmitted between the retaining wall and the main body structure. Moreover, since the edge part of the 1st water stop sheet | seat is firmly connected by the connection means to the side part of the flange of a core material, the 1st water stop sheet | seat does not peel by the water pressure which acts on the earth retaining wall. In addition, good water stop performance can be exhibited over a long period of time. Further, the first water stop sheet is provided with water guiding means, and water such as rain water and spring water is guided by the water guiding means to reduce the water pressure acting on the retaining wall. This can also prevent the water stop means from leaving the installation position, and can exhibit good water stop performance by the water stop means over a long period of time.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of a water retaining structure for a retaining wall according to the present invention. FIG. 1 is a sectional view showing the relationship between the first water retaining sheet and the retaining wall, and FIG. Sectional drawing which shows the relationship between a 2nd water stop sheet and 3rd water stop sheet, and a retaining wall, FIG. 3 is sectional drawing which shows the relationship between a 1st water stop sheet and a connection means, FIG. It is a top view.

  That is, the water retaining structure 10 of the retaining wall 1 shown in the present embodiment is applied when the retaining wall 1 is used as an underground outer wall or the like of the main body structure 35, and the retaining wall 1 is stopped from the retaining wall 1. Effective in preventing the leakage of water from acting on the main body structure 35, the water stopping means 11 for stopping the retaining wall 1, and the connecting means 20 for connecting the water stopping means 11 to the retaining wall 1. And water guiding means 31 for collecting water that acts on the retaining wall 1 and guiding it to the water storage section.

  The retaining wall 1 is formed by, for example, excavating a groove having a rectangular shape in plan view in the ground at a predetermined depth, and installing a plurality of steel cores 3 at predetermined intervals in the groove, By constructing concrete 6 as a filler by using a wall, a wall body 2 conforming to the shape of the groove is constructed, and a plurality of such wall bodies 2 are continuously constructed on the ground, and between adjacent wall bodies 2 The underground continuous wall 1 is configured by integrally connecting the two, and the underground continuous wall 1 is used as an underground outer wall of the main body structure 35 or the like.

  In the present embodiment, as shown in FIG. 1, H-shaped steel is used for the core material 3 constituting the underground continuous wall 1, and the surface 4 a of the flange 4 of each core material 3 extends along the wall surface 2 a of the wall body 2. A plurality of core members 3 are embedded in each wall body 2 at predetermined intervals so that the ribs 5 are orthogonal to the wall surface 2 a of the wall body 2.

  The water-stop means 11 is a sheet-like water-stop sheet 12, 13, or 14, which can be a commercially available water-stop sheet made of a material having water-stopping properties such as synthetic resin, synthetic rubber, and asphalt. . In the present embodiment, synthetic resin-based water-stop sheets 12, 13, and 14 (Evabrid; trade names) are used, and as shown in FIGS. 1 and 2, the adjacent core material 3 of the underground continuous wall 1 is used. The first water-stop sheet 12 is provided between the flanges 4, the second water-stop sheet 13 is provided in a portion of the underground continuous wall 1 facing the bottom plate portion 36 of the main body structure 35, and the bottom plate portion 36 of the main body structure 35 is provided. The 3rd water stop sheet 14 is provided in the surface 36a.

  As shown in FIG. 4, the first water-stop sheet 12 is formed in a strip shape covering the entire wall surface 2 a between the flanges 4 of the adjacent core members 3 of the underground continuous wall 1. By connecting both ends in the width direction of the water-stop sheet 12 to the side portions 4b of the flange 4 in a watertight manner by the connecting means 20 described later, the wall surface 2a between the flanges 4 of the adjacent core members 3 is stopped. Water leakage from the wall surface 2a is prevented.

  A water guide means 31 is provided over the substantially entire length of the first water stop sheet 12 at the center of the back surface side of the first water stop sheet 12, and rainwater and springs acting on the underground continuous wall 1 by the water guide means 31. Water such as water is collected and guided to a water storage section provided at the open bottom of the underground continuous wall 1, drained to the outside by a drain pump from the water storage section, and water pressure acting on the underground continuous wall 1 is reduced. The water pressure acting on the first water-stop sheet 12, the second water-stop sheet 13 described later, and the third water-stop sheet 14 is reduced. In addition, the water collection operation by the drain pump is continuously performed until the construction of the main body structure 35 is completed.

  As the water guide means 31, for example, a flat water guide member 31 made of a material having water conductivity (such as various foamed resins) can be used. However, the present invention is not limited to this, and any structure may be used as long as it can form a water conduit that guides water to the water storage section on the back surface side of the first water stop sheet 12.

  As shown in FIG. 3, the connecting means 20 includes a support member 21 (inner support member 21) that is integrally connected to the side portion 4 b of the flange 4 of the core member 3, and a pair superposed on the surface of the inner support member 21. Sealing members 22, 23 (inner sealing member 22 and outer sealing member 23), and a supporting member 24 (outer supporting member 24) paired with an inner supporting member 21 superimposed on the surface of the pair of sealing members 22, 23. The auxiliary seal member 25 superposed on the surface side of the outer support member 24 and the screw fastening for integrally connecting the auxiliary seal member 25, the outer support member 24, the outer seal member 23, the inner seal member 22, and the inner support member 21. And a body 26.

  The inner support member 21 is in the form of a strip made of flat steel or the like, and is formed to have a length that extends over substantially the entire length of the core material 3. Are arranged so as to be parallel to the surface 4a of the flange 4, and in this state, the side portion of the flange 4 is integrally joined to the side portion 4b of the flange 4 by welding at predetermined intervals over the entire length. 4b is integrally connected to 4b.

  Between the side portion 4b of the flange 4 of the core material 3 and the inner support member 21, the waterproof seal 15 is bonded to the surface thereof over the substantially entire length of the core material 3 after being integrally connected by welding. Therefore, the gap between the flange 4 of the core member 3 and the inner support member 21 is stopped.

  The inner support member 21 is provided with through holes 21a penetrating between the front and back surfaces at a plurality of predetermined intervals over the entire length so that the fastening screws 27 of the screw fastening body 26 can pass through the through holes 21a. It is configured.

  The inner seal member 22 is a water-expandable rubber seal material (when in contact with water, the water absorbing component in the rubber absorbs water and expands its own volume, thereby filling the gap and improving the water tightness. The inner support member 21 has the same length as the inner support member 21 and is formed with a smaller width than the inner support member 21 material.

  A portion corresponding to the through hole 21a of the inner support member 21 of the inner seal member 22 is provided with a through hole 22a penetrating between the front and back surfaces, and the fastening screw 27 of the screw fastening body 26 passes through each through hole 22a. It is configured to be possible. The inner seal member 22 is superposed on the surface side of the inner support member 21 such that each through hole 22a matches with each through hole 21a of the inner support member 21. In the present embodiment, an ultra seal (trade name) is used for the inner seal member 22.

  Similar to the inner seal member 22, the outer seal member 23 has a band shape made of a water-expandable rubber seal material, and is formed to have the same length, width, and thickness as the inner seal member 22. A through hole 23a that penetrates between the front and back surfaces is provided in a portion corresponding to each through hole 22a, and a fastening screw 27 of a screw fastening body 26 is configured to be able to pass through each through hole 23a.

  The outer seal member 23 is superposed on the surface side of the inner seal member 22 such that each through hole 23 a matches the through hole 22 a of the inner seal member 22, and the outer seal member 23 is positioned between the outer seal member 23 and the inner seal member 22. The end of the water stop sheet 12 in the width direction is sandwiched and fixed in a watertight manner. In the present embodiment, an ultra seal (trade name) similar to the inner seal member 22 is used for the outer seal member 23.

  The outer support member 24 has a strip shape made of flat steel or the like, like the inner support member 21, and is formed to have the same width and length as the inner support member 21. A through hole 24a that penetrates between the front and back surfaces is provided in a portion corresponding to the through hole 21a, and the fastening screw 27 of the screw fastening body 26 is configured to be able to pass through each through hole 24a. The outer support member 24 is superposed on the surface side of the outer seal member 23 such that each through hole 24 a matches the through hole 23 a of the outer seal member 23.

  The screw fastening body 26 includes a through hole 24a of the outer support member 24, a through hole 23a of the outer seal member 23, a through hole 22a of the inner seal member 22, and a through hole 21a of the inner support member 21 from the surface side of the outer support member 24. And a fastening screw 27 having a tip protruding to the back side of the inner support member 21 and a fastening nut 28 screwed to the tip of the fastening screw 27 protruding to the back side of the inner support member 21. Yes.

  An end portion in the width direction of the first water blocking sheet 12 is positioned between the inner seal member 22 and the outer seal member 23, and in this state, the fastening screw 27 and the fastening nut 28 are fastened to each other, thereby An end portion in the width direction of the water sheet 12 is sandwiched and fixed in a watertight manner between the inner seal member 22 and the outer seal member 23. In this case, at both ends in the width direction of the first water-stop sheet 12, through-holes 12 a that penetrate between the front and back surfaces in portions corresponding to the through-holes 23 a of the outer seal member 23 and the through-holes 22 a of the inner seal member 22. The fastening screw 27 penetrates through the through hole 12a.

  The auxiliary seal member 25 is superposed on the portion corresponding to each through-hole 24a on the surface side of the outer support member 24, and the fastening screw 27 is inserted in the state where the central portion of the auxiliary seal member 25 is passed through the fastening screw 27. By tightening the auxiliary nut 29 screwed to the head 27 a side, the auxiliary seal member 25 is pressed against the surface of the outer support member 24 via the washer 30. By this auxiliary seal member 25, the through hole 24 a of the outer support member 24, the through hole 23 a of the outer seal member 23, the through hole 22 a of the inner seal member 22, and the through hole of the inner support member 21 from the surface side of the outer support member 24. 21a is sealed.

  Like the inner seal member 22 and the outer seal member 23, the auxiliary seal member 25 is made of a water-expandable rubber seal material. The auxiliary seal member 25 has a disk shape, and an annular protrusion 25b around the entire periphery. The through holes 24 a, 23 a, 22 a, and 21 a are sealed from the surface side of the outer support member 24 by providing the protrusions 25 b in pressure contact with the surface of the outer support member 23. In the present embodiment, an ultra ring (trade name) is used for the auxiliary seal member 25.

  In the above case, the through hole 24a of the outer support member 24, the through hole 23a of the outer seal member 23, the through hole 22a of the inner seal member 22, and the through hole 21a of the inner support member 21 are filled with a sealing agent or the like, and the auxiliary seal You may make it seal each through-hole 24a, 23a, 22a, 21a by cooperation with the member 25 and a sealing agent.

  As shown in FIG. 2, the second water-stop sheet 13 has a sheet shape and covers the entire wall surface 2 a of the lower end portion of the underground continuous wall 1 facing the bottom plate portion 36 of the main body structure 35. The adhesive is formed in a size, with the lower end of the first water-stop sheet 12 interposed inside, and the lower end of the adhesive on the wall surface 2a of the lower end of the underground continuous wall 1 and the surface 4a of the flange 4 of the core 3 Are joined together. The second waterstop sheet 13 is folded back to the surface 36a side of the bottom plate portion 36 of the main body structure 35 with the lower end portion joined to the underground continuous wall 1, and the upper end portion covers the surface 36a of the bottom plate portion 36. The sheet-like third waterstop sheet 14 arranged in this manner is integrally joined with an adhesive.

  The second water-stop sheet 13 may only be integrally joined to the lower end portion of the underground continuous wall 1 by an adhesive, but the portion corresponding to the side portion 4b of the flange 4 of the core material 3 is connected to the second water-stop sheet 13. 20 may be connected to the side 4 b of the flange 4. Thus, the 2nd water stop sheet 13 is joined to the underground continuous wall 1 more firmly by connecting the 2nd water stop sheet 13 to the side part 4b of the flange 4 of the underground continuous wall 1 by the connection means 20. be able to.

  In this case, the connecting means 20 of the second water-stop sheet 13 may be connected to the side portion 4b of the flange 4 by a connecting means 20 also serving as the first water-stop sheet 12, or separate from the first water-stop sheet 12. You may make it connect with the side part 4b of the flange 4 by the connection means 20 of a body.

Next, the construction method of the water stop structure 10 of the earth retaining wall 1 configured as described above will be described.
First, as shown in FIG. 5, the inner support member 21 is integrally connected to the side portion 4 b of the flange 4 of the core member 3 made of H-shaped steel by welding, and the side portion 4 b of the flange 4 and the inner support member 21 are connected to each other. The waterproof seal 15 is joined together by an adhesive to seal between them.

  In this case, when the first water-stop sheet 12 is superposed on the surface of the inner support member 21 so that the surface of the inner support member 21 is parallel to the surface 4 a of the flange 4, The inner support member 21 is integrally connected to the side portion 4b of the flange 4 by welding so that the surface and the surface 4a of the flange 4 are flush with each other.

  Next, a plate-shaped protective material 16 made of foamed polystyrene or the like is integrally bonded to the surface side of the inner support member 21 with an adhesive, and the openings of the through holes 21a of the inner support member 21 are closed. Further, a fastening nut 28 is integrally attached to a portion corresponding to each through hole 21a on the back surface side of the inner support member 21 with an adhesive, and the surface of the fastening nut 28 is covered with a covering material 17 made of an adhesive tape or the like. The opening of 28 screw holes is closed.

  Then, in this state, the core material 3 is built in a groove provided in the ground, and as shown in FIG. 6, concrete 6 as a filler is placed in the groove by a tremy tube, and a plurality of core materials 3 are predetermined. The wall body 2 embedded at every interval is constructed, a plurality of the wall bodies 2 having such a configuration are constructed continuously, and the underground wall 1 is constructed by connecting the adjacent wall bodies 2 together. To do.

Next, after the concrete 6 is solidified and expresses a predetermined strength, the ground on the front side (the main body structure 35 side) of the underground continuous wall 1 is excavated to expose the front side of the underground continuous wall 1. The portion of the concrete 6 indicated by the broken line on the front side of the underground continuous wall 1 is shaved to expose the surface 4a of the flange 4 of the core material 3, and the protective material 16 is peeled off from the surface of the inner support member 21 to thereby support the inner support member. The surface of 21 is exposed.
In this case, the surface of the concrete 6 is smoothed so that the wall surface 2a between the flange 4 of the core material 3 adjacent to the surface 4a of the flange 4 of the core material 3 is flush.

  Next, as shown in FIG. 7, the inner seal member 22 is superposed on the surface of the inner support member 21 attached to the flange 4 of the adjacent left side core member 3, and the through hole 21 a and the inner side of the inner support member 21 are overlapped. The inner seal member 22 is integrally joined to the surface of the inner support member 21 with an adhesive in such a state that the through hole 22a of the seal member 22 is matched.

  Next, as shown in FIG. 8, the first water stop sheet 12 is disposed between the flanges 4 of the adjacent core members 3, and one end portion (left end portion) of the first water stop sheet 12 in the width direction is the inner seal member. 22 is superposed on the surface of the first waterstop sheet 12 so that one end face (left end face) in the width direction of the first waterstop sheet 12 is brought into contact with the side portion 4b of the flange 4 of the core material 3 and in this state the width direction of the first waterstop sheet One end portion (left end portion) is integrally bonded to the surface of the inner seal member 22 with an adhesive.

Next, in a state where one end portion (left end portion) in the width direction of the first water blocking sheet 12 is superposed on the surface of the inner sealing member 22, the through hole 22 a of the inner sealing member 22 from the surface side of the first water blocking sheet 12. The through hole 12a communicating with the through hole 22a is provided in the portion of the first water blocking sheet 12 corresponding to the through hole 22a of the inner seal member 22 using a tool such as a drill.
In addition, you may provide the through-hole 12a in the both ends of the width direction of the 1st water stop sheet | seat 12 previously before carrying in a 1st water stop sheet | seat on the spot.

  Next, as shown in FIG. 9, the outer seal member 23 is superposed on the surface of one end portion (left end portion) in the width direction of the first water stop sheet 12, and the through hole 23 a of the outer seal member 23 is formed into the first water stop The outer seal member 23 is integrally joined to the surface of the first water-stop sheet 12 with an adhesive in such a state that it matches the through hole 12a of the sheet 12.

  Next, as shown in FIG. 10, the outer support member 24 is superposed on the surface of the outer seal member 23, and the through hole 24 a of the outer support member 24 is matched with the through hole 23 a of the outer seal member 23 and temporarily fixed. For example, the outer support member 24 is integrally bonded to the surface of the outer seal member 23 with an adhesive.

  Next, as shown in FIG. 11, the auxiliary nut 29, the washer 30, and the auxiliary seal member 25 are attached to the fastening screw 27 of the screw fastening body 26 in that order. Then, as shown in FIG. 12, from the surface side of the outer support member 24, the fastening screw 27 is inserted into the through hole 24 a of the outer support member 24, the through hole 23 a of the outer seal member 23, and the through hole 12 a of the first water blocking sheet 12. Then, the through hole 22a of the inner seal member 22 and the through hole 21a of the inner support member 21 are passed through, and the distal end portion of the fastening screw 27 is screwed into the fastening nut 28 on the back surface side of the inner support member 21 and tightened.

  Then, as shown in FIG. 13, the auxiliary nut 29 is tightened, and the protrusion 25 b of the auxiliary seal member 25 is pressed against the surface of the outer support member 24 via the washer 30, so that the gap between the inner seal member 22 and the outer seal member 23 is reached. Then, one end portion (left end portion) of the first waterstop sheet 12 in the width direction is sandwiched and fixed in a watertight manner.

  Next, as shown in FIG. 14, the inner seal member 22 is integrated with the adhesive by the same procedure as described above on the surface of the inner support member 21 attached to the flange 4 of the adjacent right core 3. In this state, the surface of the inner support member 21 attached to the side portion 4b of the flange 4 of the right core member 3 adjacent to the other end portion (right end portion) of the first waterstop sheet 12 in the width direction. And the right end portion of the first water-stop sheet 12 is temporarily fixed to the surface 4 a of the flange 4 with the tape 18.

  In this case, the water guide member 31 attached to the back surface side of the first water-stop sheet 12 has a lower end inserted into the water storage portion provided at the cut-off bottom portion on the front side of the underground continuous wall 1, A water channel by the water guiding member 31 is formed on the back surface side of the water sheet 12.

  Then, as shown in FIG. 15, the outer seal member 22 is superposed on the surface of the other end (right end) of the first water-stop sheet 12 by the same procedure as described above, and the surface of the outer seal member 22 is overlapped. The outer support member 24 is superposed, and in this state, the fastening screw 27 of the screw fastening body 26 is passed from the surface side of the outer support member 24 to the through hole 24a of the outer support member 24, the through hole 23a of the outer seal member 23, and the first stop. The through hole 12 a of the water sheet 12, the through hole 22 a of the inner seal member 22, and the through hole 21 a of the inner support member 21 are penetrated, and the distal end portion of the fastening screw 27 is connected to the fastening nut 28 on the back side of the inner support member 21. The auxiliary nut 29 is tightened and the projection 25b of the auxiliary seal member 25 is pressed against the surface of the outer support member 24 via the washer 30 to tighten the inner seal member 22 and the outer seal member. Between the 3 other end portion in the width direction of the first water-stopping sheet 12 (right end portion) is sandwiched and fixed watertight. And the surplus length part of the other end part (right end part) of the 1st water stop sheet 12 is cut | disconnected according to the side part 4b of the flange 4. FIG.

  And the adjacent core material of the wall body 2 of the underground continuous wall 1 is performed by performing such attachment work of the 1st water stop sheet | seat 12 with respect to the wall surface 2a between the flanges 4 of each adjacent core material 3. The wall surface 2a between the three flanges 4 can be stopped.

  And after attaching the 1st water stop sheet | seat 12 to the wall surface 2a between the flanges 4 of each adjacent core material 3 as mentioned above, as shown in FIG. 16, the ground of the front side of the underground continuous wall 1 is a main body. As shown in FIG. 17, the wall surface 2a between the flanges 4 of the adjacent core members 3 at the lower end of the underground continuous wall 1 facing the bottom slab portion 36 is dug deeper to the position where the bottom slab portion 36 of the structure 35 is constructed. Is finished to a smooth surface 6a.

  And as shown in FIG. 18, the 2nd water stop sheet | seat 13 is arrange | positioned at the lower end part which opposes the bottom plate part 36 of the main body structure 35 of the underground continuous wall 1, and the underground continuous wall by the 2nd water stop sheet | seat 13 1 is covered, and the lower end portion of the second water-stop sheet 13 is integrally joined to the lower end portion of the underground continuous wall 1 with an adhesive in this state.

  In this case, the lower end portion of the second waterproof sheet 13 is grounded with the lower end portion of each first waterproof sheet 12 interposed between the second waterproof sheet 13 and the wall surface 2a of the underground continuous wall 1. The intermediate continuous wall 1 and the surface 4a of the flange 4 of the core member 3 are integrally bonded with an adhesive.

Further, the portion corresponding to the side portion 4 b of the flange 4 of the core member 3 at the lower end portion of the second water-stop sheet 13 is integrally connected to the side portion 4 b of the flange 4 by the connecting means 20.
In this case, although the connection means 20 uses the same thing as the connection means 20 of the 1st water stop sheet 12 for the inner side support member 21 and the inner side sealing member 22, it may be a different body. The outer seal member 23 and the outer support member 24 are separate from the connecting means 20 of the first water-stop sheet 12, and the lower ends of the outer seal member 23 and the outer support member 24 of the first water-stop sheet 12 and the second stop. A gap is formed between the outer seal member 23 of the water sheet 13 and the upper end of the outer support member 24.

  And the 2nd water stop sheet 13 is pulled out to the surface side of the outer side supporting member 24 of the 1st water stop sheet 12 through said clearance gap, and the upper end part of the 2nd water stop sheet 13 is the 1st water stop sheet with the tape 18 Twelve outer support members 24 are temporarily fixed. In this state, the crushed stone 37 is laid with a predetermined thickness on the portion of the main body structure 35 that becomes the bottom plate portion 36, and the discarded concrete 38 is cast with a predetermined thickness on the crushed stone 37. The bottom plate part 36 is constructed. In addition, 19 is a buffer material made of an elastic body for preventing the second waterstop sheet 13 and the outer support member 24 from buffering.

  Then, as shown in FIG. 19, the second waterstop sheet 13 is folded back to the surface side of the bottom plate portion 36 of the main body structure 35 to stop the surface of the bottom plate portion 36 provided on the surface of the bottom plate portion 36. 3 The upper end portion of the second water-stop sheet 13 is polymerized to the end portion of the water-stop sheet 14, and the overlap portion is integrally bonded with an adhesive. Thus, by providing the 2nd water stop sheet | seat 13, while the lower end part of the underground continuous wall 1 is water-stopped, between the lower end part of the underground continuous wall 1 and the bottom plate part 36 of the main body structure 35 The interval will be stopped.

  And after providing the 1st water stop sheet | seat 12, the 2nd water stop sheet | seat 13, and the 3rd water stop sheet | seat 14 as mentioned above, a reinforcing bar is arranged on the upper part of the bottom plate part 36, and concrete is laid. Thus, the main body structure 35 can be constructed.

  In the water stop structure 10 of the earth retaining wall 1 and the construction method of the water stop structure 10 according to the present embodiment configured as described above, the first is between the flanges 4 of the adjacent core members 3 of the underground continuous wall 1. The water stop sheet 12 is provided, both ends of the first water stop sheet 12 in the width direction are integrally connected to the side 4b of the flange 4 in a watertight manner by the connecting means 20, and the second end is connected to the lower end of the underground continuous wall 1. The water stop sheet 13 is provided, and the entire bottom end of the underground continuous wall 1 is stopped by the second water stop sheet 13, and the lower end of the underground continuous wall 1 and the main body structure are stopped by the second water stop sheet 13. 35, the surface 36a of the bottom plate portion 36 of the main body structure 35 is water-stopped by the third water-stop sheet 14, and therefore the core of the underground continuous wall 1 is stopped. Foreign matter (first water sealing sheet) between the surface 4a of the flange 4 of the material 3 and the main body structure 35 12) does not so interposed. Therefore, stress transmission can be reliably performed between the underground continuous wall 1 and the main body structure 35.

  Further, both ends of the first water-stop sheet 12 are firmly connected to the side portions 4b of the flange 4 of the core member 3 of the underground continuous wall 1 by the connecting means 20, and the lower end portion of the second water-stop sheet 13 is the ground. Since the middle continuous wall 1 is firmly joined with an adhesive and the upper end portion is firmly joined to the third water-stop sheet 14 with an adhesive, the first water-stop sheet 12 is caused by water pressure acting on the underground continuous wall 1. Peels from the underground continuous wall 1 or peels off at the joint between the second waterstop sheet 13 and the underground continuous wall 1 and at the joint between the second waterstop sheet 13 and the third waterstop sheet 14. The water stop performance can be exhibited over a long period of time, and water leakage from the underground continuous wall 1 can be prevented from occurring in the main body structure 35.

  Further, a water guide member 31 is provided on the back surface side of the first water stop sheet 12, and water such as rain water and spring water acting on the underground continuous wall 1 is collected by the water guide member 31 and guided to the water storage unit, from the water storage unit. Since the drainage pump is configured to drain water to the outside, it is possible to reduce the water pressure such as rainwater and spring water acting on the underground continuous wall 1 during the construction period, and the first waterstop sheet 12 and the second waterstop. The water pressure acting on the sheet 13 and the third water stop sheet 14 can be reduced.

In the above description, the example in which concrete 6 is used as the filler of the wall body 2 of the underground continuous wall 1 has been described. However, soil cement may be used instead of the concrete 6, In this case, the same effects can be obtained.
In the above description, an example in which H-shaped steel is used as the core material 3 of the underground continuous wall 1 has been described. However, other steel materials such as C-shaped steel and I-shaped steel may be used. Has the same effect.

It is sectional drawing which showed the relationship between the 1st water stop sheet | seat of one Embodiment of the water stop structure of the earth retaining wall by this invention, and the earth retaining wall. It is sectional drawing which showed the relationship between the 2nd water stop sheet, the 3rd water stop sheet, and the earth retaining wall. It is sectional drawing which showed the relationship between a 1st water stop sheet | seat and a connection means. It is a top view of the 1st water stop sheet. It is explanatory drawing which showed the construction method of a water stop structure, Comprising: It is sectional drawing which showed the state which attached the inner side support member to the flange of the core material. It is sectional drawing which showed the state which shaved the front side of the retaining wall after construction of the retaining wall. It is sectional drawing which showed the state which superposed | polymerized the inner side sealing member on the surface of the inner side supporting member attached to the flange of the adjacent left side core material. It is sectional drawing which showed the state which superposed | polymerized the right end part of the 1st water stop sheet | seat on the surface of the inner side sealing member. It is sectional drawing which showed the state which superposed | stacked the outer side sealing member on the surface of the 1st water stop sheet. It is sectional drawing which showed the state which superposed | polymerized the outer side supporting member on the surface of the outer side sealing member. It is explanatory drawing which showed the state which attached the auxiliary | assistant nut, the washer, and the auxiliary | assistant seal member to the screw fastening body. It is explanatory drawing which showed the state which attached the screw fastening body to the inner side supporting member, the inner side sealing member, the 1st water stop sheet, the outer side sealing member, and the outer side supporting member. It is explanatory drawing which showed the state which clamped and fixed the 1st water stop sheet between the inner side sealing member and the outer side sealing member by tightening the auxiliary | assistant nut of a screw fastening body. An explanation showing a state in which the inner seal member is superposed on the inner support member attached to the flange of the adjacent right core, and the right end portion of the first water blocking sheet is bridged between the inner support member and the flange. FIG. It is explanatory drawing which showed the state which connected the right end part of the 1st water stop sheet | seat to the flange of the adjacent right side core material watertightly by the connection means. It is explanatory drawing which showed the state which dug down the ground of the front side of a retaining wall to the depth corresponding to the bottom plate part of a main body structure. It is explanatory drawing which showed the state of the wall surface of the lower end part of a retaining wall. It is sectional drawing which showed the state joined to the lower end part of the 2nd water stop sheet | seat at the lower end part of the earth retaining wall. The upper end portion of the second water-stop sheet was folded back on the surface of the bottom plate portion of the main body structure, and the upper end portion of the second water-stop sheet was joined to the third water-stop sheet disposed on the surface of the bottom plate portion. It is explanatory drawing.

Explanation of symbols

1 retaining wall (continuous underground wall)
DESCRIPTION OF SYMBOLS 2 Wall body 2a Wall surface 3 Core material 4 Flange 4a Surface 4b Side part 5 Rib 6 Filler (concrete) 6a Smooth surface 10 Water stop structure 11 Water stop means 12 1st water stop sheet 12a Through-hole 13 2nd water stop sheet 14 Third waterproof sheet 15 Waterproof seal 16 Protective material 17 Cover material 18 Tape 19 Buffer material 20 Connecting means 21 Inner support member 21a Through hole 22 Inner seal member 22a Through hole 23 Outer seal member 23a Through hole 24 Outer support member 24a Through hole 25 Auxiliary seal member 25a Through hole 25b Through hole 26 Screw fastening body 27 Fastening screw 27a Head 28 Fastening nut 29 Auxiliary nut 30 Washer 31 Water guide means (water guide member)
35 Main body structure 36 Bottom plate part 36a Surface 37 Crushed stone 38 Discarded concrete

Claims (9)

When using a retaining wall in which a plurality of steel cores are embedded in the interior of the wall at intervals, a retaining structure for retaining the retaining wall to stop the retaining wall,
A water stopping means provided on a wall surface of the earth retaining wall on the main body structure side to stop water between adjacent core members of the earth retaining wall; and a connecting means for water-tightly connecting the water stopping means to the core member. A water retaining structure for a retaining wall, comprising: a water guiding means that is provided in the water retaining means and collects water acting on the retaining wall and guides the water to a water storage section.   The water stop means is a sheet-like first water stop sheet that is provided on a wall surface of the earth retaining wall on the main body structure side and that stops the wall surface between adjacent core members of the earth retaining wall, and the earth retaining wall. A second water-stop sheet that is provided at a lower end portion of the wall surface on the main body structure side to stop the entire wall surface of the lower end portion and between the lower end portion and the bottom plate portion of the main body structure, It consists of the 3rd water stop sheet | seat which stops the surface of the bottom plate part of a main body structure, The water stop structure of the earth retaining wall of Claim 1 characterized by the above-mentioned.   The coupling means includes an inner support member coupled to a side portion of the core member, an inner seal member that is polymerized on the surface of the inner support member, and an outer seal member that is polymerized on the surface of the inner seal member; An outer support member superposed on a surface of the outer seal member; and the outer support member, the outer seal member, the inner seal member, and a screw fastening body integrally connecting the inner support member, and the inner seal. The water stop structure of the earth retaining wall according to claim 2, wherein an end portion of the first water stop sheet is sandwiched and fixed in a watertight manner between a member and the outer seal member.   The screw fastening body is screwed to the outer support member, the outer seal member, the inner seal member, a fastening screw that passes through the inner support member, and a tip portion of the fastening screw that protrudes from the inner support member. The water retaining structure for a retaining wall according to claim 3, further comprising a fastening nut.   The water retaining structure for a retaining wall according to claim 4, wherein an auxiliary seal member that seals a penetration portion of the fastening screw is superposed on a surface side of the outer support member.   The water retaining structure for a retaining wall according to claim 5, wherein an auxiliary nut that presses the auxiliary seal member against the surface of the outer support member is screwed to the fastening screw.   The second water stop sheet is integrally connected to the lower end of the wall surface of the earth retaining wall in a watertight manner with the lower end of the first water stop sheet interposed inside, and the upper end is connected to the main body. 7. The retaining wall retaining wall according to claim 2, wherein the retaining wall wall is integrally connected to the third water-stop sheet in a state of being folded back to the surface side of the bottom plate portion of the structure. Water structure. This is a method for constructing a water retaining structure for a retaining wall in which the retaining wall is water-stopped when a retaining wall in which a plurality of steel cores are embedded in the interior of the wall is spaced apart. And
After the construction of the retaining wall, the wall surface of the retaining wall on the main body structure side is shaved to expose the surface of the core material, and the surface of the support member previously attached to the side portion of the core material is exposed. Process,
The both ends of the first water stop sheet with the water guide member attached in advance to the back side are sandwiched between the pair of seal members, and in this state, the both ends of the first water stop sheet are superposed on the surface side of the support member. Further, a support member paired with the support member is superposed on the surface side of the outer seal member, and the outer support member, the outer seal member, the first water blocking sheet, the inner seal member, and the inner support A step of watertightly connecting an end portion of the first water-stop sheet to a side portion of the core member by passing a fastening screw through the member and screwing and fastening a fastening nut to the fastening screw;
A second water-stop sheet is disposed on the entire wall surface of the lower end portion of the main wall structure facing the bottom plate portion of the main retaining wall, and the lower end portion of the first water-stop sheet is placed inside the lower end portion of the second water-stop sheet. In the state where the part is interposed, it is integrally joined to the wall surface of the lower end part in a water-tight manner, and the upper end part of the second water-stop sheet is folded back on the surface of the bottom part of the main body structure and arranged on the surface of the bottom part. A method for constructing a water retaining structure for a retaining wall, comprising: a step of watertightly and integrally joining a third water stopping sheet.   A protective material that closes the penetration portion of the fastening screw is detachably attached to the surface side of the inner support member, and is fastened to a portion corresponding to the penetration portion of the fastening screw on the back surface side of the inner support member. The nut is bonded, and the surface of the fastening nut is covered with a covering material. In this state, the core material is built at the construction site of the retaining wall, and the filling material is solidified by placing a filler at the construction site. 9. The method for constructing a water stop structure for a retaining wall according to claim 8, wherein the wall surface on the main body structure side of the retaining wall is shaved to expose the surface side of the inner support member.