JP4516847B2 - Construction method and joint structure of joint part of water shielding material - Google Patents

Description

  The present invention relates to a method for constructing a joint portion having water-impervious properties at the time of connection of a water shielding material and a joint structure.

  Steel pipe sheet piles, water shielding panels, etc. are often used as a water shielding material for preventing the leakage of contaminated water at a waste disposal site and constructing harbor facilities. In particular, when used in a water-proof revetment structure at a waste disposal site, prevent leaching of contaminated water from the disposal site to the outside through joints of water-shielding materials such as steel pipe sheet piles and water-proof panels. is required.

  The joint portion of the water shielding material is filled with a water stop material such as mortar and asphalt mixture, and the water stop material prevents the contaminated water from leaching out of the field through the joint portion. In order to improve the water-stopping performance of this water-stopping material, before filling the water-stopping material, the earth and sand that has entered the joint when the water-blocking material is placed is removed by a water jet, air lift, or other removal method, and washed. It is common to do.

  However, since the diameter of the joint portion is small, there is a problem that the workability of removing and cleaning the earth and sand is poor and time is required. Further, when the depth of the water shielding material is increased, the efficiency of water jet, air lift and the like is lowered, so that it is difficult to remove earth and sand, which requires a lot of time.

  Therefore, in Patent Document 1, as a method for preventing the intrusion of earth and sand into the joint portion at the time of placing, before placing the water shielding material 1 as shown in FIG. From the diameter of the female joint portion 3 in advance in the tubular female joint portion 3 having a slit S, which is integrally fixed along the longitudinal direction of the water-shielding material body 2 on the side surface, that is, the direction in which the water shielding material body is placed. A method has been proposed in which a cylindrical tube 4 with a bottom cover having a slightly smaller diameter is inserted and the water shielding material 1 is placed, and then the cylindrical tube 4 with a bottom cover is pulled out.

Also, as a method for preventing earth and sand from entering the joint portion of the punching設時, before pouring the water barrier material, pre-expanded polystyrene in the female coupling, urethane foam, low-strength mortar, filler such as a chemical solution A method is known in which after filling and water blocking material is placed, all the filler is destroyed, and after removal, the joint is filled with a water-stopping material such as mortar and asphalt mixture .
Japanese Patent No. 3009845

  However, the method of inserting the cylindrical tube with the bottom cover into the female joint portion described in Patent Document 1 is that a small sand is placed in the gap between the female joint portion and the cylindrical tube with the bottom cover when placing the water shielding material. In addition, there is a problem that the clay tube enters and bites, making it difficult to pull out the cylindrical tube after placing, and it takes time to pull out.

Also, styrofoam into the female coupling part described above, a method of filling a filler such as urethane foam, although it is possible to prevent the entry of sediment when pouring water-barrier material, after casting, the filler There was a problem that all had to be crushed.

Furthermore, in the method of inserting the cylindrical tube with the bottom cover into the female joint portion described in Patent Document 1, after pulling out the cylindrical tube with the bottom cover, or with the filler such as styrene foam or urethane foam in the female joint portion described above. In the method of filling, after removing the filler, when inserting the male joint part into the female joint part from above the female joint part, the earth and sand pushed out by the water shielding material body enters the female joint part from the slit. There was a point. In addition, when the female joint and the male joint are engaged, the gap between the female joint member and the male joint is so narrow that the removal and cleaning workability of the earth and sand is poor, and the earth and sand are completely removed. It is difficult to do this, and there is a problem that the water stopping performance of the water stopping material is deteriorated if there is any earth or sand remaining.

  Therefore, the present invention has been made in view of the above problems, and its purpose is to reliably prevent the intrusion of earth and sand into the joint portion of the water shielding panel when the water shielding panel is placed. It is to propose a construction method and joint structure of a joint having a water-blocking property capable of forming a water-filling material-filling cavity that sufficiently exhibits water performance.

In order to achieve the above object, a method for constructing a joint portion of a water shielding material of the present invention is a first water shielding material formed by integrally forming a tubular female joint portion having a slit along an end portion along a longitudinal direction. And a second water shielding material in which a male joint part having a convex part is integrally formed at the end along the longitudinal direction, and the convex part of the male joint part is used as the tubular female joint. In the construction method of the joint portion of the water shielding material to be inserted and engaged in the portion, the first water shielding material pre-filled with the filler in the tubular female joint portion is driven into the ground, and the first The tubular female joint at the convex portion so that the filler remains between the vicinity of the slit of the tubular female joint portion of the water shielding material and the convex portion of the second water shielding material. Inserting the convex portion into the tubular female joint portion so that the second water shielding material passes through the slit while crushing the filler in the portion. The tubular female joint portion and the male joint portion are engaged, and the filling of the portion is performed by injecting pressurized fluid between the inner surface of the tubular female joint portion facing the slit and the convex portion. The material is crushed and removed to form a cavity, and the cavity is filled with a water stop material.

  According to a second invention, in the first invention, the filler is made of a lightweight foam such as a lightweight mortar having a specific gravity smaller than that of water.

The joint structure of the water shielding material according to the third aspect of the present invention is the first water shielding material formed by integrally forming the tubular female joint portion having the slit at the end along the longitudinal direction, and the male having the convex portion. A second water shielding material formed integrally at the end portion along the longitudinal direction, and the convex portion of the male joint portion is inserted into the tubular female joint portion and engaged therewith. A joint structure for a water shielding material, the inner surface of the tubular female joint portion facing the slit, the space between the vicinity of the slit in the tubular female joint portion and the convex portion being filled with a filler. A water-stopping material having a higher water- stopping property than the filler is filled between the convex portion and the convex portion.

  According to a fourth invention, in the third invention, the filler is made of a lightweight foam such as a lightweight mortar having a specific gravity smaller than that of water.

  According to the present invention, at the time of placing a water-impervious panel, it is possible to reliably prevent the intrusion of earth and sand into the joint portion of the water-impervious panel and to form a water-filling material filling cavity that sufficiently exhibits the water-stopping performance. be able to. Therefore, after filling with the water blocking material, it is possible to ensure water shielding of the joint portion of the water shielding panel.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing an installation state of a water shielding material according to the first embodiment of the present invention. As shown in FIG. 1, as a water shielding material that constitutes a water shielding wall between the waste disposal site 100 and the surrounding ground 101, for example, to a depth where the row of the water shielding panels 102 reaches the impermeable formation 103. It has been cast. On the impermeable formation 103, there is a water permeable formation 104.

  FIG. 2 is a plan view showing an installation state of the water shielding panel according to the first embodiment of the present invention. As shown in FIG. 2, the water-impervious panel 102, which is a plate-shaped water-impervious material, is integrated with the panel main body 102 a along the longitudinal direction of the panel main body, that is, the direction in which the panel main body is placed on one side surface thereof. A round tubular female joint portion 102b having a slit S fixed thereto, and a male joint portion 102c having a C-shaped cross section (= convex portion) fixed integrally with the other side surface along the longitudinal direction of the panel body; And a cross-shaped crushing tool 102d fixed to the distal end portion of the male joint portion 102c in the placing direction.

  The female joint portion 102b of the first water shielding panel 102 and the male joint portion 102c having a C-shaped cross section of the second water shielding panel 102 inserted into the female joint portion 102b are lightweight mortar 105 and the like. Are engaged through the filler. In such an engaged state, the water stop material 111 is filled so as to be in close contact with the water stop surface 102e of the male joint portion 102c and the inner surface 102f of the female joint portion 102b, thereby constructing the joint portion 106 having water shielding properties.

A construction method of the joint portion 106 having the water-impervious property will be described below according to the installation procedure of the water-impervious panel 102.
FIG. 3 is a flowchart showing the installation procedure of the water shielding panel according to the first embodiment of the present invention. 4-8 is a figure which shows the installation procedure of the water-impervious panel which concerns on 1st embodiment of this invention.

  First, in S10 of FIG. 3, as shown in FIG. 4, before placing the water-impervious panel 102 in the ground, it is easy to prevent the earth and sand from entering the female joint portion 102b of the water-impervious panel 102 in advance. The lightweight mortar 105 is filled as a filler capable of being crushed, and the lightweight mortar 105 is hardened by leaving the water shielding panel 102 to stand.

In this embodiment, for example, a lightweight mortar 105 having a uniaxial compressive strength of 300 KN / m ² , an air amount of 66.5%, and a specific gravity of 0.52 g / cm ³ smaller than water is used as the filler. The filler is not limited to this, and may be, for example, a lightweight foam having a predetermined uniaxial compressive strength such as foamed concrete or foamed resin and satisfying a condition that the specific gravity is smaller than water. That's fine. Moreover, the uniaxial compressive strength and specific gravity of the filler are appropriately changed according to the site environment such as the ground condition at the construction site.

  In general, the light weight mortar 105 needs to be cured by pouring into the female joint portion 102b until it is hardened to the extent that it can be placed and then allowed to stand for one day or longer. However, since a large site is required for standing and curing the impermeable panel 102, it is often impossible to leave the impermeable panel 102 for one day or longer at the construction site. . Therefore, there is a method of adding a hardening accelerator or a quick setting agent mainly composed of calcium chloride or the like to cure in a short time. However, the addition of a hardening accelerator containing chloride is applied to the steel impermeable panel 102. In the joint portion of the water shielding panel 102 that requires long-term durability because of the possibility of deterioration and the addition of a quick setting agent causes unevenness in the interior and surface state of the light weight mortar. Is not suitable for use in a lightweight mortar 105.

  Therefore, in this embodiment, in order to strictly control the blending ratio of water, cement, foaming agent, etc., the curing time, and the curing strength of the lightweight mortar 105, the filling operation into the female joint portion 102b is performed at the factory. After inspecting the state and the like, the water shielding panel 102 filled with the lightweight mortar 105 in the female joint portion 102b is shipped to the construction site.

  Next, in S11 of FIG. 3, as shown in FIG. 5, the first water-impervious panel 102 is vibrated with a vibro hammer or the like while the female joint portion 102b is filled with the lightweight mortar 105, or the die hammer. The water shielding panel 102 is placed in a predetermined ground 108 while applying striking vibration with a hydraulic hammer (not shown). When placing, since the lightweight mortar 105 is filled in the female joint portion 102b of the water-impervious panel 102, earth and sand do not enter the female joint portion 102b.

  Next, in S12 of FIG. 3, as shown in FIG. 6, from the upper side of the female joint portion 102b of the first water shielding panel 102, the second water shielding panel 102 is vibrated with a vibro hammer or the like. While applying a striking vibration with a dizel hammer or a hydraulic hammer and crushing the lightweight mortar 105 in the female joint portion 102b into a circular shape at the C-shaped section of the male joint portion 102c of the second water-impervious panel 102, The male joint portion 102c is inserted into the female joint portion 102b so that the panel body 102a of the second water-impervious panel 102 passes through the slit S, and the female joint portion 102b and the male joint portion 102c are connected via the lightweight mortar 105. Engage.

  In addition, when water is poured into the male joint portion 102c when the second water-impervious panel 102 is placed, the crushed lightweight mortar 105 floats because the specific gravity is smaller than that of water, and can be easily recovered. It is.

  In the joint portion 106 after the second water-impervious panel 102 has been laid, only between the female joint portion 102b of the first water-impervious panel 102 and the male joint portion 102c of the second water-impervious panel 102. The lightweight mortar 105 remains, and a cavity 107 penetrating to the bottom of the hole is formed.

  Then, in S13 of FIG. 3, as shown in FIG. 7, the water injection pipe 110 of the water jet 109 is inserted to the bottom of the hole in the cavity 107 formed in the joint portion 106, and the water injection pipe 110 is gradually pulled up while being gradually pulled up. Pressurized water is injected into the cavity 107 from the tip to remove the light weight mortar 105 existing between the inner peripheral surface 102e serving as the water stop surface of the male joint portion 102c and the inner surface 102f of the female joint portion 102b facing the slit S. At the same time, the exposed both surfaces 102e and 102f are washed at all depths.

  The exposure situation of both surfaces 102e and 102f after cleaning is confirmed by visual observation with a borehole camera at all depths. Here, when the light weight mortar 105 has adhered to the both surfaces 102e and 102f even a little, it is washed again with the water jet 109 to completely expose the both surfaces 102e and 102f.

  As a method for removing the lightweight mortar 105, for example, a method of injecting pressurized water with a water jet 109 is shown, but the method is not limited to this, and a method of injecting compressed air such as an air gun may be used.

  The shape of the cavity 107 is not particularly limited as long as the cavity 107 has a size that allows the water injection pipe 110 and the borehole camera of the water jet 109 to be inserted.

  Finally, in S14 of FIG. 3, as shown in FIG. 8, the injection tube 112 for injecting the water blocking material 111 is inserted to the bottom of the hole in the cavity 107, and the injection tube 112 is gradually pulled up from the tip of the tube to the cavity 107. The water stop material 111 is filled in the inside. The water-stop material 111 is filled in the cavity 107, pressed against both surfaces 102e and 102f and brought into close contact, and exhibits water-stopping properties.

  As long as the waterstop material 111 has an elastic sealing performance, it is possible to select and use any one of clay, clay mortar, mortar, asphalt, concrete, etc. Asphalt water-stopping material is used.

  Further, the asphalt water-stopping material 111 used in the present embodiment is an elastic body and has a followability to the deformation of the joint portion 106, so that the water-stopping performance is maintained even during deformation such as an earthquake.

  Therefore, it is possible to reliably prevent intrusion of earth and sand into the joint portion of the water-impervious panel at the time of placing the water-impervious panel and to form a water-filling material filling cavity that sufficiently exhibits the water-stop performance. Furthermore, after filling with the water blocking material, it is possible to ensure water shielding of the joint portion of the water shielding panel.

Next, another embodiment in which the joint shape of the water shielding panel in the present invention is different will be shown.
In the following description, the same reference numerals are given to the portions corresponding to those using the same technique as in the first embodiment, and the description is omitted.

  FIG. 9 is a plan view showing an installation state of the PT joint water-impervious panel according to the second embodiment of the present invention. As shown in FIG. 9, the water-impervious panel 202 includes a panel main body 102a, a female joint portion 102b fixed to one side surface thereof, and is fixed integrally to the other side surface along the longitudinal direction of the panel main body. A male joint portion 202c having a T-shape (= convex portion) and a skewer-shaped crusher 202d fixed in the vicinity of the distal end portion of the male joint portion 202c in the placing direction are provided.

  The female joint portion 102b of the first water shielding panel 202 and the male joint portion 202c having a T-shaped cross section of the second water shielding panel 202 inserted into the female joint portion 102b are a lightweight mortar 105 or the like. Are engaged through the filler. In this engaged state, the water-stopping material 111 is filled so as to be in close contact with the water-stopping surface 202e of the male joint portion 202c and the inner surface 102f of the female joint portion 102b, thereby constructing the joint portion 206 having a water-blocking property.

  FIG. 10 is a view showing a joint portion of a PT joint water-impervious panel according to the second embodiment of the present invention. As shown in FIG. 10, as in the first embodiment, the first water shielding panel 202 is driven into the predetermined ground 108 in a state where the female joint portion 102b is filled with the lightweight mortar 105. Next, from the upper side of the female joint portion 102b of the first water-impervious panel 202, the second water-impervious panel 202 is vibrated with a vibro hammer or the like, or a striking vibration is imparted with a diesel hammer or a hydraulic hammer, The panel body 102a of the second water-impervious panel 202 passes through the slit S while crushing the lightweight mortar 105 in the female joint part 102b at the T-shaped section of the male joint part 202c of the second water-impervious panel 202. Thus, the male joint portion 202 c is inserted into the female joint portion 102 b and the female joint portion 102 b and the male joint portion 202 c are engaged via the lightweight mortar 105.

  In the joint portion 206 after the second water-impervious panel 202 is placed, the periphery of the slit S of the female joint portion 102b of the first water-impervious panel 202, the male joint portion 202c of the second water-impervious panel 202, and The light weight mortar 105 remains only in between, and a cavity 207 penetrating to the bottom of the hole is formed.

  Then, the water jet 109 removes the light weight mortar 105 existing between the water stop surface 202e of the male joint portion 202c and the inner surface 102f of the female joint portion 102b, and attaches both exposed surfaces 202e and 102f at all depths. It wash | cleans until a kimono is lose | eliminated and the water stop material 111 is filled in the cavity 207. FIG.

  FIG. 11: is a figure which shows the coupling | joint part of the T joint water impervious panel with P-stopper which concerns on 2nd embodiment of this invention. As shown in FIG. 11, the water shielding panel 212 includes a panel body 102a, a female joint portion 102b, a male joint portion 202c, a skewer-shaped crushing tool 202d, and a stopper that prevents entry into the female joint portion 102b. 212g and a stopper 212h that prevents the female joint portion 102b from coming off.

  Further, the female joint portion 102b of the first water shielding panel 212 and the male joint portion 202c having a T-shaped cross section and the stopper 212h of the second water shielding panel 212 inserted into the female joint portion 102b are lightweight. It is engaged through a filler such as mortar 105. In this engaged state, the water-stopping material 111 is filled so as to be in close contact with the water-stopping surface 202e of the male joint portion 202c and the inner surface 102f of the female joint portion 102b, thereby constructing the joint portion 206 having a water-blocking property.

  After placing the first impermeable panel 212, when the second impermeable panel 212 is implanted, the tip of the second impermeable panel becomes vertical due to the difference in the hardness of the ground. In some cases, the tip of the second water-impervious panel 212 advances in a direction away from or approaching the first water-impervious panel 212 without being driven. At this time, the second water-impervious panel 212 can be driven into a predetermined position by the action of a stopper 212g for preventing entry into the female joint portion 102b and a stopper 212h for preventing withdrawal from the female joint portion 102b. It becomes possible.

  FIG. 12 is a view showing a joint portion of a square-T joint water-proof panel according to the second embodiment of the present invention. As shown in FIG. 12, the water-impervious panel 222 includes a panel body 102a, a rectangular tubular female joint portion 222b having a slit S, which is integrally fixed to one side surface of the panel body 102a along the longitudinal direction of the panel body. A joint portion 202c and a skewer-shaped crusher 202d are provided.

  Further, the female joint portion 222b of the first water shielding panel 222 and the male joint portion 202c having a T-shaped cross section of the second water shielding panel 222 inserted into the female joint portion 222b are lightweight mortar 105 and the like. Are engaged through the filler. In this engaged state, the water stop material 111 is filled so as to be in close contact with the water stop surface 102e of the male joint portion 202c and the inner surface 222f of the female joint portion 222b, thereby constructing the joint portion 206 having water shielding properties.

  FIG. 13: is a figure which shows the coupling | joint part of the square-stopper T joint water impervious panel with stopper which concerns on 2nd embodiment of this invention. As shown in FIG. 13, the water-impervious panel 232 includes a panel body 102a, a female joint portion 222b, a male joint portion 202c, a skewer-shaped crusher 202d, a stopper 212g, and a stopper 212h.

  Further, the female joint portion 222b of the first water shielding panel 232 and the male joint portion 202c having a T-shaped cross section and the stopper 212h of the second water shielding panel 232 inserted into the female joint portion 222b are lightweight. It is engaged through a filler such as mortar 105. In this engaged state, the water-stopping material 111 is filled so as to be in close contact with the water-stopping surface 202e of the male joint portion 202c and the inner surface 222f of the female joint portion 222b, and the joint portion 206 having a water shielding property is constructed.

  Therefore, even in the construction method of the water shielding panel according to the second embodiment, when the water shielding panel is placed, it is possible to reliably prevent the intrusion of earth and sand into the joint portion of the water shielding panel, and the water stopping performance of the water blocking material is improved. It is possible to form a cavity for filling the water-stopping material that can be exhibited. And after filling with a water stop material, the water-imperviousness of the joint part of a water-impervious panel is securable.

  In all the embodiments, the construction method of the water shielding panel which is a plate-like water shielding material has been described. However, the present invention is not limited to this. For example, a steel pipe sheet pile which is a tubular water shielding material may be used. Moreover, in all the embodiments, the method of placing the water-impervious panel in the ground is shown, but the present invention is not limited to the ground, and for example, it can be placed in soil cement.

It is a side view which shows the installation condition of the water shielding material which concerns on 1st embodiment of this invention. It is a top view which shows the installation condition of the impermeable panel which concerns on 1st embodiment of this invention. It is a flowchart which shows the installation procedure of the water shielding panel which concerns on 1st embodiment of this invention. It is a figure which shows the state which filled the lightweight mortar in the female joint part of the water shielding panel which concerns on 1st embodiment of this invention. It is a figure showing the state where the 1st impermeable panel concerning a first embodiment of the present invention was laid in the ground. It is a figure which shows the state which casts the 2nd water-impervious panel which concerns on 1st embodiment of this invention, and formed the cavity in the coupling part. It is a figure which shows the state which wash | cleans the inside of a cavity with the water jet which concerns on 1st embodiment of this invention. It is a figure which shows the state which fills the water stop material in the cavity which concerns on 1st embodiment of this invention. It is a top view which shows the installation condition of the water shielding panel which concerns on 2nd embodiment of this invention. It is a figure which shows the joint part of the PT joint water impervious panel which concerns on 2nd embodiment of this invention. It is a figure which shows the coupling | joint part of the T joint water impervious panel with P-stopper which concerns on 2nd embodiment of this invention. It is a figure which shows the joint part of the square-T joint water impervious panel which concerns on 2nd embodiment of this invention. It is a figure which shows the coupling | joint part of the square-stopper T joint water-proof panel which concerns on 2nd embodiment of this invention. It is a figure which shows the conventional Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Waste disposal site 101 Surrounding ground 102 Water-impervious panel 102a Panel main body 102b Female joint part 102c Male joint part 102d Crushing tool 102e Water stop surface 102f Inner peripheral surface 103 Impervious stratum 104 Pervious stratum 105 Light weight mortar (= filler) 106 Joint part 107 Cavity 108 Ground 109 Water jet 110 Water injection pipe 111 Water stop material 112 Injection pipe 202 Water shielding panel 202c Male joint part 202d Crushing tool 202e Water stop surface 206 Joint part 207 Cavity 212 Water shielding panel 212g Stopper 222 Water shielding panel 222b Female joint part 222f Inner peripheral surface 226 Joint part 227 Cavity 232 Water shielding panel

Claims (4)

A first water shielding material formed by integrally forming a tubular female joint portion having a slit along the longitudinal direction at an end portion, and a male joint portion having a convex portion integrally formed along the longitudinal direction. In the construction method of the joint portion of the water shielding material that is inserted into and engaged with the convex portion of the male joint portion into the tubular female joint portion, using the second water shielding material formed in
Placing the first water-impervious material pre-filled with filler in the tubular female joint portion into the ground,
A vicinity of the slit of said tubular female coupling of the first water blocking material, as the filler between said convex portion of the second water blocking material remains, before Kitotsujo portion The convex female portion is inserted into the tubular female joint portion so that the second water shielding material passes through the slit while crushing the filler in the tubular female joint portion. And the male joint part,
Crushing and removing the filler of the part by injecting a pressurized fluid between the inner surface of the tubular female joint part facing the slit and the convex part, forming a cavity part,
A construction method for a joint portion of a water shielding material, wherein the hollow portion is filled with a water stop material.   2. The construction method for a joint portion of a water shielding material according to claim 1, wherein the filler is made of a lightweight foam such as a lightweight mortar having a specific gravity smaller than that of water. A first water shielding material formed by integrally forming a tubular female joint portion having a slit along the longitudinal direction at an end portion, and a male joint portion having a convex portion integrally formed along the longitudinal direction. A joint structure of a water shielding material formed by inserting and engaging the convex portion of the male joint portion into the tubular female joint portion, using a second water shielding material formed on
Wherein between the vicinity of the slit of the tubular female coupling in portion and the convex portion is filled with a filling material, between said slit the tubular female fitting part facing the inner surface and the convex portion of the filling A watertight material joint structure, characterized in that it is filled with a waterstop material having a higher water stoppage than that of the material .   The joint structure for a water shielding material according to claim 3, wherein the filler is made of a lightweight foam such as a lightweight mortar having a specific gravity smaller than that of water.

Images