JP2016205076A - Joint part water cutoff method of impervious wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint part water cutoff method of an impervious wall, easy in coping with a case that a hindrance is caused in water cutoff performance of a joint part after installing a sheet pile, and capable of inexpensively forming a water cutoff structure of high reliability.SOLUTION: After constructing a multiple wall-shaped impervious wall body having wall bodies 5a and 5b formed by mutually adjacently joining a plurality of sheet piles 1, 1, etc. having joint members 4a and 4a in both side end parts, in opposed arrangement with an interval therebetween, a cover member 11 for covering a joint part 4 is installed on the opposed surface side of mutually opposed one wall body 5a by straddling the sheet piles 1 and 1 adjacent at both ends. A timbering body 12 whose one end is supported by the mutually opposed other wall body 5b and whose the other end presses both edges of the cover member 11 against the one wall body 5a, is interposed between both wall bodies 5a and 5b.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for suitably stopping a joint portion of a sheet pile in a sheet pile-type impermeable wall installed in a waste final disposal site, and in particular, after the sheet pile is installed, the joint portion is stopped afterwards. The present invention relates to a water stop method for a joint portion of a water-impervious wall.

  Conventionally, vertical impervious works at waste disposal sites such as sea surface landfill sites have multiple box-type steel sheet piles joined together in the wall width direction and equipped with multiple wall bodies facing each other at intervals in the front and rear direction. A box-type steel sheet pile type impermeable wall is known (for example, see Patent Document 1).

  As shown in FIG. 8, the box-type steel sheet pile 1 includes a pair of side plate portions 2 and 2 facing each other with a space therebetween, and a pair of web portions 3 and 3 disposed between the side plate portions 2 and 2. Joint members 4a and 4a formed on both side ends of the side plate portions 2 and 2 are provided.

  The impermeable wall A composed of the box-shaped steel sheet pile 1 hits the box-shaped steel sheet piles 1 and 1 against the bottom ground B while engaging the joint members 4a and 4a of the adjacent box-shaped steel sheet piles 1 and 1 with each other. By being installed, it is surrounded by the front and rear wall bodies 5a and 5b, the front and rear wall bodies 5a and 5b, and the web sections 3 and 3 which are continuous in the width direction via the joint portion 4 including the joint members 4a and 4a. It is formed in the structure provided with the impermeable chamber 6.

  Moreover, the water stop of the joint part 4 is engaged by preliminarily applying a water-swellable primary water stop material 7 to the inner surfaces of the joint members 4a and 4a, and installing the box steel sheet pile 1 in water. A method in which the primary water blocking material 7 in the joint members 4a and 4a thus expanded expands to fill a gap between the joint members 4a and 4a is widely used.

  Furthermore, in this kind of impermeable wall A, since high reliability is required, the joint portion 4 that joins the box steel sheet piles 1 and 1 adjacent to each other is subjected to water stop treatment (primary water stop), By filling the water blocking chamber 6 adjacent to the joint portion 4 with a secondary water stop material 8 made of a soil-based hardly water-permeable material (secondary water stop), a multiple water stop structure is formed. Alternatively, the water shielding performance of the entire water shielding wall is maintained even when any of the water stopping performance in the water shielding chamber 6 fails. In FIG. 8, the secondary waterstop material 8 is hatched for convenience.

  However, in the joint portion 4 of this type of water-impervious wall A, for example, when the box-shaped steel sheet pile 1 is placed, the stop applied to the inside of the joint members 4a and 4a due to friction between the joint members and friction with the ground. The water stopping performance may be impaired at the construction stage of the impermeable wall A, for example, the water material is peeled off or damaged.

  Therefore, in the construction of the water-impervious wall A, it is preferable to inspect and evaluate the water-stopping state of the joint portion 4 before filling the water-blocking chamber 6 with the secondary water-stopping material 8. As shown in FIG. 5, the water level WL1 and WL2 separated by the wall bodies 5a and 5b in a state where water is stretched in the impermeable chamber 6 adjacent to the joint portion 4, and the measured internal and external water level differences WL1 to WL2 and There are some which are evaluated based on the change with time of the internal water level WL1.

JP 2007-2554 A

  However, in the conventional technology as described above, when the water stop material in the joint member is peeled off or damaged, and the water stop performance (primary water stop) of the joint portion is hindered, the trouble is described above. Although it is possible to check on site before filling with the secondary waterstop material by the evaluation method, there is currently no specific method for solving the problem.

  For example, when there is a problem with the water-stopping condition of a joint, the method for eliminating the problem is to pull out the box-type steel sheet pile with the relevant joint member and re-apply a new box-type steel sheet pile there. However, this method is practically impossible because of the huge construction period and cost.

  As another method, a mold member made of channel steel or the like is put on a problematic joint part, and a water-stopping material made of an impermeable material is filled in the mold member, and the joint part is water-stopped. A method of stopping water by covering with a material is conceivable. However, in this method, a water-stopping material is filled in a mold member made of channel steel or the like, and it is stopped from inside the mold member until it solidifies. In order to prevent the water material from leaking out, it is necessary to attach both end edges of the formwork member to the surface of the wall body in an inseparable manner.

  In that case, a method of fixing the engaging member that engages with the edge of the formwork member in the vicinity of the joint portion of the sheet pile such as a box-shaped steel sheet pile so that the formwork member can be easily attached. However, in this case, it is difficult to predict which of the many joints will cause trouble. An engaging member must be provided in advance on the steel sheet pile. On the other hand, if there is no trouble, all the engaging members that are not used are wasted, which is uneconomical.

  Therefore, in view of such a conventional problem, the present invention is easy to cope with when the water stop performance of the joint part after installation of the sheet pile is hindered, and forms a highly reliable water stop structure at low cost. It was made for the purpose of providing a method for stopping water at the joint portion of the impermeable wall.

  The feature of the invention according to claim 1 for solving the conventional problem as described above is that a plurality of sheet piles having joint members on both side end portions are adjacent to each other, and the joint members are engaged with each other to form each sheet pile. After constructing a multiwall-shaped water-impervious wall main body comprising a plurality of wall bodies formed by joining in an arrangement facing each other at intervals, the joint members of the wall bodies engaged with each other are constructed. In a joint water-stopping method for a water-blocking wall for water-stopping a joint part, opposite wall sides of one wall body facing each other a cover member having a cross-sectional groove shape that covers the joint part across the adjacent sheet piles A water-impervious structure in which one end is supported by the other wall body facing each other, and a support body that presses both end edges of the cover member against the one wall body at the other end is interposed between the two wall bodies. It is in the water stop method of the joint part of the wall.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, a water-stop coating is provided that fills the cover member with a water-stop material and covers the joint portion between the cover member and the wall body. It is to form a part.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the support body and the cover member are removed after the water blocking material is solidified.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the joint portions of the wall bodies facing each other are arranged at symmetrical positions in the facing direction, and the cover member is The support body is installed between the cover members, and one end of the support body is supported by the other wall body facing each other through the other cover member. There is.

  According to a fifth aspect of the present invention, in addition to the structure of any one of the first to fourth aspects, a width-retaining body including a guide frame portion that guides the cover member in the depth direction is provided as the water shielding wall main body. After installing the cover member by being guided by the width-retaining body, the support body is interposed between the wall bodies in a state where the cover member is held by the width-retaining body.

  In addition to the structure of any one of claims 1 to 5, the feature of the invention of claim 6 is provided with a wedge-shaped guide having a tapered surface inclined in the wall-to-wall direction on the support body side of the cover member, The support body is formed in a wedge shape having a tapered pressing surface slidably contacting the tapered surface at an end portion thereof.

  According to a seventh aspect of the present invention, in addition to the structure of any one of the first to fifth aspects, the support body includes an expansion / contraction portion that expands and contracts in the direction between the walls, and the expansion / contraction portion extends in the extension direction. And a spring body to be pushed out.

  As described above, the method for waterproofing the joint portion of the impermeable wall according to the present invention joins the respective sheet piles by adjoining a plurality of sheet piles having joint members at both end portions, and engaging the joint members with each other. After the construction of a multiwall-type water-impervious wall main body comprising a plurality of wall bodies formed in such a manner as to face each other at intervals, a joint comprising the joint members engaged with each other of the wall bodies In the method of water-stopping a joint part of a water-blocking wall that stops the part, a cover member having a cross-sectional groove shape that covers the joint part across the adjacent sheet piles is installed on the facing surface side of one wall body facing each other In addition, the cover is provided by interposing a supporting body between the two wall bodies so that one end is supported by the other wall body facing each other and both end edges of the cover member are pressed against the one wall body at the other end. It is possible to stop the joint with water It may need to be previously provided a member for attaching the cover member to the sheet pile without, easily and inexpensively corresponding to repair when trouble occurs in the water stopping subjected to joint.

  In the present invention, the cover member is filled with a water stop material, and a water stop covering portion that covers the joint portion is formed between the cover member and the wall body. The joint portion can be water-stopped by the water-stop covering portion that can be used.

  Furthermore, in this invention, after the said water stop material solidifies, a cover member and a support body can be reused by removing the said support body and the said cover member, and it is economical.

  Further, in the present invention, the joint portions of the wall bodies facing each other are arranged at positions symmetrical to each other in the facing direction, the cover member is installed on the inner side surface of the wall body, and the support work body is mounted on the both sides. By interposing between the cover members and supporting one end of the support body on the other wall body facing the other through the other cover member, the joint portion of the opposing wall body at the support body is stopped simultaneously. be able to.

  Furthermore, in the present invention, a width retaining body having a guide frame portion for guiding the cover member in the depth direction is installed on the water-blocking wall main body, and the cover member is disposed by guiding the width retaining body. Thereafter, the cover member and the support body can be efficiently installed by interposing the support body between the wall bodies in a state where the cover member is held by the width retaining body.

  Furthermore, in the present invention, the support member is provided with a wedge-shaped guide having a tapered surface inclined in the wall-to-wall direction on the support member side of the cover member, and the support member has a tapered shape that is in sliding contact with the tapered surface at an end thereof. The support body can be easily installed and the cover member can be reliably pressed against the wall body.

  In the present invention, the support body can be easily installed by being provided with an expansion / contraction part that expands and contracts in the direction between the walls and a spring body that pushes the expansion / contraction part in the extension direction. In addition, the cover member can be reliably pressed against the wall body.

It is a top view which shows an example of the water shielding wall by which the joint part was water-stopped by the joint part water-stopping method of the water shielding wall concerning this invention. It is XX sectional drawing same as the above. (A)-(c) is a top view for demonstrating each process of the first half of the joint part water stop method of the impermeable wall which concerns on this invention. (D)-(f) is a top view for demonstrating each process of the latter half of the same as the above. (A)-(c) is the elements on larger scale which show the kind of cover member in FIG. It is a schematic longitudinal cross-sectional view which shows the state which attached the support body shown to FIG.4 (e). (A) is a top view which shows the usage condition of the other Example of a support body, (b) is the longitudinal cross-sectional view. It is a top view which shows an example of the conventional box-shaped steel sheet pile type | mold water shielding wall. It is a longitudinal cross-sectional view for demonstrating the method to test | inspect the water stop state of the joint part of a multiple sheet pile type water shielding wall.

  Next, an embodiment of the water-blocking joint water-stopping method according to the present invention will be described based on the examples shown in FIGS.

  In the present embodiment, a box-type steel sheet pile type impermeable wall installed in an industrial waste disposal site will be described as an example. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned prior art example, the code | symbol A is a water-impervious wall, the code | symbol B is a water bottom ground, and code | symbol 1 is a box-shaped steel sheet pile.

  Further, in this embodiment, for convenience of explanation, the left side is the front, the right side is the rear, and the direction in which the sheet piles are connected (up and down in FIG. 1) is defined as the wall width direction through the impermeable wall A in FIG. The inside vertical direction is referred to as the depth direction.

  This water-impervious wall A has a plurality of (this embodiment) facing each other at intervals in the front-rear direction by placing box-shaped steel sheet piles 1, 1. Then, a water-blocking wall body having a pair of wall bodies 5a and 5b is constructed, and each joint body 4 joining the adjacent box-shaped steel sheet piles 1 and 1 of each wall body 5a and 5b is stopped by water. Water is blocked before and after the walls 5a and 5b.

  Moreover, in this water-impervious wall A, a secondary water-stopping material 8 made of a soil-based hardly water-permeable material is provided in a closed space (hereinafter referred to as a water-impervious chamber 6) between the wall portions 5a and 5b adjacent to the joint portion 4. By filling, a multiple water blocking structure is formed so that the water blocking performance of the entire water blocking wall A can be maintained even if the water blocking performance of either the joint portion 4 or the water blocking chamber 6 is impaired. I have to.

  In the joint part water-stopping method according to the present invention, the sheet pile after the sheet piles such as the box-type steel sheet piles 1, 1. The joint portion 4 is water-stopped by the cover member 11 and the water-stop covering portion 10 that cover the joint portion 4 on the opposite surface side of the joint portion 4 that joins between 1 and 1. In FIG. 1, the secondary waterstop material 8 is hatched for convenience.

  As shown in FIG. 1, each box-type steel sheet pile 1, 1... Has a pair of side plate portions 2, 2 that face each other at an interval, and an end portion that faces each side plate portion 2, 2. A pair of web portions 3 and 3 that are fixed and connect the side plate portions 2 and 2 and a C-shaped joint member 4a formed on both side ends of each side plate portion 2 are provided, and the joint members 4a and 4a are connected to each other. By engaging, the side portions of the adjacent box-shaped steel sheet piles 1 and 1 can be joined.

  Therefore, a plurality of opposing steel sheet piles 1, 1... Are placed in the wall width direction at a desired depth to be opposed to the impermeable wall main body at an interval in the front-rear direction. In this embodiment, a pair of wall bodies 5a, 5b and a water shielding chamber 6 surrounded by both front and rear wall bodies 5a, 5b and web portions 3, 3 are formed, and the joints of the front and rear wall bodies 5a, 5b are formed. The parts 4 and 4 are respectively arranged at symmetrical positions in the front-rear direction.

  And as shown in FIG. 3, FIG. 4, while installing the cover members 11 and 11 on the opposing surface side of each wall 5a, 5b so that the joint part 4 may be covered across the sheet piles 1 and 1 which both ends adjoin. The joint member 4 is stopped by interposing a support body 12 between the wall bodies 5a and 5b to press both end edges of the cover members 11 and 11 against the wall bodies 5a and 5b.

  Further, in this state, a water-stopping material is filled in the cover members 11 and 11, and a water-stop covering portion 10 that covers the joint portion 4 is formed between the cover member 11 that covers the joint portion 4 and the wall bodies 5a and 5b. By doing so, the joint part 4 is stopped. In FIG. 1, the water blocking coating portion 10 is hatched for convenience.

  The water-stopping material is composed of a material that has a certain fluidity at the time of charging, and then solidifies in water and exhibits watertightness. For example, epoxy resin, cement bentonite, underwater inseparable mortar, underwater inseparable It is possible to use an anti-sludge material or the like mainly composed of concrete, plant-based (sawdust and walnut shell), mineral-based (such as mica pieces), or synthetic products (such as cellophane pieces).

  The cover member 11 has a cross-sectional groove shape in which a groove-shaped cross section that is open on one side surface such as a U-shape, a semicircular shape, a C-shape, and a V-shape is continuous in the longitudinal direction, and one side surface and both longitudinal ends are open. For example, a grooved steel shown in FIG. 5 (a), a steel pipe shown in FIG. 5 (b) divided into two in the center in the axial direction, a C-shaped steel shown in FIG. 5 (c), etc. Can be used.

  A support guide composed of a pair of support guide members 13a and 13a arranged in parallel with each other in the longitudinal direction is integrally attached to the back surface of the cover member 11, that is, the side opposite to the side opening. The end of the support body 12 is inserted between the support guide members 13 a and 13 a, and the end of the support body 12 is guided by the support guide 13 for movement in the depth direction.

  Further, as shown in FIG. 6, a wedge-shaped guide 14 having a tapered surface 14a inclined in the direction between the wall bodies 5a and 5b is provided between the support guide members 13a and 13a.

  Further, both end edges of the cover member 11 are provided with water-stopping contact materials 15 and 15 over the entire length of the end surfaces, so that both end edges of the installed cover member 11 and the wall bodies 5a and 5b can be in close contact with each other. I am doing so.

  In addition, although the aspect of the water stop contact materials 15 and 15 is not particularly limited, for example, it is made of a water-swellable water stop material made of special polyurethane or the like, or an elastic material such as cap-like, seal-like or mat-like rubber. Things can be used.

  As shown in FIG. 6, the support body 12 is supported at every desired height of the support base 20 and the support base 20 facing in the vertical direction suspended by a work ship or a crane installed on land. A plurality of wedge members 21a to 21e are provided, and wedge members 21a to 21e having different lengths, each having a pressing surface 22 having the same inclination angle at both ends, are arranged at intervals in the vertical direction so that the whole proceeds downward. As a result, it has a wedge-shaped (inverted trapezoidal) fish-bone shape where the width between both ends decreases.

  Therefore, the support body 12 can be easily inserted between the wedge-shaped guides 14, 14. When the desired depth is reached, the pressing surface 22 comes into contact with the tapered surface 14 a, and the other cover member 11 and the wedge-shaped guide 14 are interposed. Thus, a reaction force is applied to one of the wall bodies 5a and 5b to press each cover member 11 against the wall bodies 5b and 5a.

  In addition, the aspect of the support body 12 is not limited to the above-mentioned Example, For example, the whole support structure 12 may form one wedge shape (inverted trapezoid shape), and FIG. As shown, the support member 30 may have a structure in which the cover member 11 is pressed against the walls 5a and 5b by a spring.

  The support body 30 is supported by a support base 31 extending in the vertical direction that is suspended by a crane installed on a work ship or on the land, and a plurality of support bases 31 supported in the horizontal direction at every desired height of the support base 31. Of the pressing members 32, 32..., And each pressing member 32 is supported by the pressing member main body and expansion / contraction portions 33, 33 extending and contracting in the direction between the wall bodies 5a, 5b. And a spring body 34 that pushes the stretchable portions 33, 33 in the extending direction.

  And this support body 30 has each pressing member 32,32 ... interposed between both cover members 11,11 in the state which contracted the expansion-contraction part 33,33 of both ends, and the expansion-contraction part by the spring body 34 always. The tips 32 and 32 are pressed against the back surface of the cover member 11.

  In addition, at the front-end | tip of the expansion-contraction part 32, the caster 35 inserted between the support work guides 13 and guided by the both support work guides 13 in the depth direction is provided, and the support body 30 can move smoothly in the depth direction. I am doing so.

  Next, a specific procedure for forming the water stop covering portion 10 using the cover member 11 will be described.

  First, as shown in FIG. 3A to FIG. 3B, the width retaining body 41 including the guide frame portions 40 and 40 that guide the cover member 11 in the depth direction is aligned with the position of the joint portion 4. Let it be installed on the top surface of the impermeable wall body.

  The width-retaining body 41 includes, for example, a pair of temporary width-retaining members 42 and 42 installed on the front and rear wall bodies 5a and 5b with a gap in the wall width direction with the joint portion 4 interposed therebetween, and the other temporary width-retaining member. Backside support members 43, 43 supported by the temporary width retaining members 42, 42 so that one end protrudes toward the members 42, 42 side, and the temporary width retaining members 42, 42 and the rear surface support member 43 are provided. , 43 form frame-shaped guide frame portions 40, 40.

  The temporary fixing members 42 and 42 and the back support members 43 and 43 are made of steel materials such as H-shaped steel and square steel, respectively. Although not particularly shown, the side plate portions 2 and 2 or the web portion 3 are respectively fixed by fixtures such as clamps. , 3 is fixed to the upper edge.

  The guide frame portions 40, 40 are formed in a frame shape matched with the shape of the cover member 11 shown in the figure by a combination of the temporary width retaining members 42, 42 and the back surface support members 43, 43, and both temporary width retaining members 42. , 42 guides the side surface of the cover member 11 in the depth direction by the back surface support members 43, 43, respectively.

  Moreover, the back surface support members 43 and 43 are arranged at intervals in the wall width direction so that the support guide 13 protruding from the back surface of the cover member 11 can be inserted between the end surfaces of the back surface support members 43 and 43. It has become.

  Next, as shown in FIG. 3 (c), the cover members 11 and 11 are inserted into the guide frame portions 40 and 40 of the width-retaining body 41 from the upper surface side of the impermeable wall body, and the cover members 11 and 11 are inserted into the cover members 11 and 11, respectively. The lower end reaches the water bottom ground B and the upper end protrudes above the water surface, and the opposite surface side of the joint portion 4 is covered with a cover member 11 having a cross-sectional groove shape straddling the sheet piles 1 and 1 adjacent to each other.

  At that time, each cover member 11 guided by the width-stopping body 41 and the wall bodies 5a, 5b are in a non-contact state or in a slidable contact state with little friction, and the cover member 11 is guided to the width-stopping body 41. It is possible to smoothly lower the water-stopping contact material 15 and 15 without damaging it.

  And if installation of each cover member 11 is completed, as shown in FIG.4 (d), the support body 12 will be interposed between the both cover members 11 and 11 arrange | positioned symmetrically in the front-back direction.

  As shown in FIG. 6, the support body 12 is supported at both ends in the front-rear direction from the upper surface side of the water-impervious wall main body in a state where it is suspended by a work ship or a crane (not shown) installed on land. It is inserted into the guide 13 and suspended while being guided by the support work guide 13.

  And if it falls to a predetermined depth position, the pressing surface 22 of the support body 12 will contact | abut with the taper surface 14a, and it will take each reaction member to wall body 5a, 5b via the support body 12, and will cover each cover member 11 with it. Pressing against the walls 5a and 5b, the water-stop contact member 15 of each cover member 11 is brought into close contact with the opposing surface of the walls 5a and 5b to close the gap between the walls 5a and 5b and the end face of the cover member 11 The inside and outside of the member 11 are shielded, and the joint portion 4 is stopped.

  Next, when the installation of the cover member 11 and the support body 12 is completed, as shown in FIG. 4 (e), the width retaining body 41 is removed, and then the cover member 11 is used as a formwork to cover the cover member. 11 is filled with a water-stopping material.

  At that time, the cover member 11 covers the joint portion 4 across the adjacent sheet piles 1 and 1, and both ends of the support body 12 are supported by the wall bodies 5 a and 5 b via the cover member 11, and the reaction force covers the cover member 11. Since the member 11 is pressed against the wall bodies 5a and 5b, respectively, the leakage of the water blocking material thrown into the cover member 11 is prevented, and the joint portion 4 is straddled across the adjacent box-shaped steel sheet piles 1 and 1. The water-impermeable waterproof material is densely filled around.

  Then, the water-stopping material is solidified while the cover members 11 are held from the wall bodies 5a and 5b through the support body 12 so as not to be detached, and on the water bottom ground B adjacent to the water shielding chamber 6 of the joint portion 4. The water stop covering portion 10 is formed to cover the exposed portion over the entire surface.

  Finally, the support body 12 and the cover member 11 are removed, and the water stop (primary water stop) of the joint portion 4 that joins the adjacent box-shaped steel sheet piles 1 and 1 is completed.

  In this joint-part water stopping method for the water-impervious wall A, the cover member 11 takes a reaction force against one wall body via the support body 12 (30) and is pressed against the other wall body. When the water stop (repair) of the joint part 4 is necessary after the installation of the box steel sheet piles 1, 1,..., For example, the original primary water stop is applied to the inside of the joint member 4a. The water-swellable water-stopping material that has been made can handle easily and inexpensively if a failure is found in the primary water-stopping in the inspection / evaluation of the impermeable chamber 6 (joint part 4) after the sheet pile is installed. .

  That is, according to the method of the present invention, even when the joint portion 4 needs to be stopped afterwards, it is not necessary to fix the cover member 11 directly to the wall bodies 5a and 5b. It is possible to eliminate waste of providing a member for fixing the cover member 11.

  Further, the cover member 11 can also be used as a mold for forming the water-stop covering portion 10, and is filled with a water-stopping material in the cover member 11, and a joint is formed between the cover member 11 and the wall bodies 5a and 5b. By forming the water stop covering portion 10 that covers the portion 4, the joint portion 4 can be stopped twice by the cover member 11 and the water stop cover portion 10.

  Further, after the water stop material filled in the cover member 11 is solidified, the water stop state of the joint portion 4 is maintained by the water stop covering portion 10 even without the cover member 11, so that the cover member 11 and the supporting body are supported. 12 can be removed, whereby the cover member 11 and the support body 12 can be reused many times, which is economical.

  In the above-described embodiment, the case where the water stop material is filled in the cover member 11 to form the water stop covering portion 10 has been described. However, the joint portion 4 is formed only by the cover member 11 supported by the support body 12. You may make it stop water.

  Moreover, although the above-mentioned Example demonstrated the example which removes the cover member 11 and the support body 12 after forming the water stop coating | covering part 10, only both the cover member 11 and the support body 12 or the cover member 11 are demonstrated. May be left in the impermeable chamber 6.

  Moreover, in the above-mentioned Example, although the box-shaped steel sheet pile type water-impervious wall A was demonstrated, each sheet pile, such as a steel pipe sheet pile and a U-shaped steel sheet pile, is connected through the joint part 4, respectively. The present invention can also be applied to the impermeable wall A provided with a plurality of wall bodies facing each other.

  Furthermore, arrangement | positioning of the joint part 4 is not limited to the case where it is symmetrical before and behind, In that case, you may make it support one end of the support body 12 on one wall body 5a, 5b which opposes directly.

A water shielding wall B water bottom ground 1 box-type steel sheet pile 2 side plate part 3 web part 4 joint 4a joint member 5a, 5b wall body 6 impermeable chamber 7 primary water-stopping material 8 secondary water-stopping material 10 water-stop covering part 11 cover Member 12 Supporting body 13 Supporting guide 13a Supporting guide member 14 Wedge-shaped guide 14a Tapered surface 15 Stopping water contact material 20 Support base 21 Wedge member 22 Pressing surface 30 Supporting body 31 Support base 32 Pressing member 33 Extendable part 34 Spring body 35 Caster 40 Guide frame portion 41 Width retaining body 42 Temporary width retaining member 43 Back support member

Claims (7)

A plurality of sheet piles having joint members at both ends are adjacent to each other, and a plurality of wall bodies formed by joining the joint members with each other by joining the joint members to each other are provided to face each other at intervals. In the water-blocking joint joint water-stopping method for water-stopping the joint portion formed of the joint members engaged with each other of the wall bodies after constructing the multiple wall-shaped water-proof wall main body,
A cover member having a cross-sectional groove shape that covers the joint portion across the adjacent sheet piles is installed on the facing surface side of one wall body facing each other, and one end is supported by the other wall body facing each other, A method for water-stopping a joint portion of a water shielding wall, wherein a support body that presses both end edges of the cover member against the one wall body at the other end is interposed between the two wall bodies.   The method for water-stopping a joint portion of a water-blocking wall according to claim 1, wherein a water-stopping material is filled in the cover member, and a water-stop covering portion that covers the joint portion is formed between the cover member and the wall body. .   The method for waterproofing a joint portion of a water shielding wall according to claim 2, wherein the support body and the cover member are removed after the waterstop material is solidified.   The joint portions of the wall bodies facing each other are arranged at symmetrical positions in the facing direction, the cover members are installed on the inner side surfaces of the wall bodies, and the support body is interposed between the cover members. The method for water-stopping a joint portion of a water shielding wall according to any one of claims 1 to 3, wherein one end of the support body is supported by the other wall body facing each other through the other cover member.   A width retaining body having a guide frame portion for guiding the cover member in the depth direction is installed on the water-blocking wall main body, and the cover member is installed after being guided by the width retaining body. The method for water-stopping a joint portion of a water-impervious wall according to any one of claims 1 to 4, wherein the support body is interposed between the wall bodies in a state of being held by a width retaining body.   The cover member includes a wedge-shaped guide having a tapered surface inclined in the wall-to-wall direction on the support body side, and the support body has a wedge-shaped shape having a tapered pressing surface that is in sliding contact with the tapered surface at an end portion thereof. The method for water-stopping a joint portion of a water-impervious wall according to any one of claims 1 to 5, wherein   The joint of the impermeable wall according to any one of claims 1 to 5, wherein the support body includes an expansion / contraction portion that expands and contracts in a direction between the walls, and a spring body that pushes the expansion / contraction portion in the extension direction. Partial water stop method.

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