JP2016130393A - Double-jointed sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-jointed sheet pile provided with a double joint that enhances reliability of a water shielding wall and other wall bodies, at the same time allowing fitting and positioning of a joint part to be performed readily and promptly.SOLUTION: A double-jointed sheet pile 1 that applies the present invention is for constructing a wall body 7 by connecting the sheet piles in a wall width direction X in a ground 8, and includes a body part 2 extending in a wall height direction Y, and a double joint 3 that forms a pair by being disposed on a front surface side A and a rear surface side B in a wall thickness direction Z, and having a joint part 4 disposed on the body part 2. The double joint 3 is disposed to extend in the wall height direction Y along the body part 2, and either of the joint parts 4 paired in the wall thickness direction Z is protruded more than the other of the joint parts 4 paired in the wall thickness direction Z, in either or both of upward and downward directions in the wall height direction Y.SELECTED DRAWING: Figure 7

Description

  TECHNICAL FIELD The present invention relates to a double joint sheet pile for connecting a wall body in a ground direction in a ground.

  Conventionally, when constructing a water-impervious wall such as a waste disposal site, a backup function can be provided by doublely placing a water-impervious wall using steel sheet piles, for example, The water-blocking structure disclosed in Patent Document 1 has been proposed as one that reliably blocks outflow of harmful substances by conventional common-sense construction management.

  In addition, as in the double joint structure disclosed in Non-Patent Document 1, steel sheet piles, steel pipe sheet piles, and the like can be applied as vertical impermeable walls by applying a water shielding treatment to the joint portion. Therefore, more reliable water-blocking structures are required for water-impervious seawalls at waste disposal sites. For this reason, it is possible to provide a more reliable water shielding structure by providing a backup function in the event of water leakage or by providing a monitoring function during construction.

JP 2003-213670 A

“Study on water shielding performance and applicability of steel impervious walls”, Port Airport Technical Research Institute document No. 1142 2006.9 Page 15 (Issued by National Institute for Ports and Airports)

  The water-impervious structure disclosed in Patent Document 1 is arranged such that continuous walls made of hat-shaped steel sheet piles are arranged in a double manner so that the webs overlap each other, and soft inside the double hat-shaped steel sheet piles. It is filled with a proper water shielding material. However, when each steel sheet pile is driven separately to form a double wall, the frictional resistance between the webs increases and the webs may be separated in the ground, and the webs overlap each other. So difficult to install. For this reason, it is possible to place the combined steel sheet piles after combining the webs with each other before placing the steel sheet piles, but each combined steel sheet pile has a double joint structure. When connecting the combined steel sheet pile driven in the latter to the combined steel sheet pile driven in advance, it is necessary to simultaneously fit both joint parts that form a double joint structure. Alignment becomes difficult.

  In addition, by using a steel sheet pile having a double joint structure including two joint parts as in the double joint structure disclosed in Non-Patent Document 1, the water shielding treatment is performed on both joint parts. In addition to providing a back-up function to the impermeable wall and using a space sandwiched between both joints without the need for special labor such as installing a separate partition plate, it is necessary to identify the location of water leakage Monitoring can also be carried out. For this reason, if a steel sheet pile with a double joint structure provided with two joint parts is used and both of the joint parts are subjected to a water shielding treatment, the water shielding wall can have a backup function, and both joints can be provided. If the space between the two parts is used, it is possible to provide a monitoring function for each joint part, but each steel sheet pile has a double joint structure, so that both joints have a double joint structure. Since it is necessary to fit a part simultaneously, fitting construction of a joint part becomes difficult.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to use a double joint sheet pile provided with a double joint, so that a wall body such as a water shielding wall is provided. An object of the present invention is to provide a double joint sheet pile that can improve the reliability of the joint portion and at the same time can easily and quickly perform fitting position alignment of the joint portion.

  The double joint sheet pile according to the first invention is a double joint sheet pile for constructing a wall body by connecting in the wall width direction in the ground, and a main body portion extending in the wall height direction, and a front surface in the wall thickness direction. A double joint in which a joint part is provided on the main body part as a pair on the side and the back side, and the double joint extends in the wall height direction along the main body part, Either one of the joints paired in the thickness direction is protruded toward one or both of the upper and lower sides in the wall height direction from the other joint part paired in the wall thickness direction. It is provided.

  The double joint sheet pile according to the second invention is the double joint sheet pile according to the first invention, wherein the double joint is a pair of joint parts on the front side and the back side in the wall thickness direction. Any one of the joint parts paired in the wall thickness direction with only the double joint provided on one side in the wall width direction is a pair in the wall thickness direction. The other joint part is provided so as to protrude downward in the wall height direction.

  In the double joint sheet pile according to the third invention, in the first invention or the second invention, any one of the joint parts paired in the wall thickness direction is paired in the wall thickness direction. The other joint part is provided so as to protrude downward in the wall height direction, and a water shielding material is provided inside the joint part only in the wall height direction range along the main body part. It is characterized by.

  A double joint sheet pile according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the double joint is a pair of the joint portions paired in the wall thickness direction. A protruding length L that protrudes upward or downward in the wall height direction from any one of the above-mentioned joint portions is provided as satisfying the relationship defined by the following expression (1). To do. Here, W is the distance between the joint portions paired in the wall thickness direction, and α is the interval between the gaps formed inside the joint portions when the plurality of joint portions are fitted together.

  A double joint sheet pile according to a fifth invention is characterized in that, in any one of the first invention to the fourth invention, the main body portion is a box-shaped member formed in a box shape having a substantially rectangular cross section.

  According to 1st invention-5th invention, wall bodies, such as a water shielding wall, are provided by the double water-impervious structure by the joint part made into a pair in the wall thickness direction by providing a joint part in two places of the wall thickness direction. Is provided with a backup function, so that it is possible to reliably block out contaminated soil from the waste disposal site and to prevent outflow of contaminated water due to groundwater flow. According to 1st invention-5th invention, using the space between the joint parts made into a pair in the wall thickness direction, it is made to mutually fit among the fitting parts of the joint part made continuous in the wall height direction. It is possible to carry out monitoring for identifying a fitting portion where the water stoppage of the joint portion in the state is insufficient.

  According to 1st invention-5th invention, any one joint part of the double joint made into a pair in the wall thickness direction is from the other joint part of the double joint made a pair in the wall thickness direction. Because it is provided to project upward or downward in the wall height direction, even if the trailing double joint sheet pile swings due to the influence of wind, etc., one joint part of the trailing double joint sheet pile Can be fitted to one joint part of the preceding double joint sheet pile, and the other joint part of the subsequent double joint sheet pile can be fitted to the other joint part of the preceding double joint sheet pile Thus, it is possible to easily and quickly carry out the fitting position adjustment of both joint portions.

  In particular, according to the third invention, a water shielding material is provided on the inner side of the joint portion of the succeeding double joint sheet pile only in the range in the wall height direction along the main body portion except for the portion where the protruding portion is formed. When the first double joint sheet pile is slid from above in the wall height direction, the joint part of the preceding double joint sheet pile is advanced from the joint part where the protruding portion of the subsequent double joint sheet pile is formed. Preventing the water shielding material from becoming an obstacle to fitting at the protruding part, and smoothing the fitting work between the joint part of the trailing double joint sheet pile and the joint part of the preceding double joint sheet pile It becomes possible.

  In particular, according to the fourth aspect of the present invention, the protrusion length that protrudes upward or downward in the wall height direction satisfies the relationship defined by the above formula (1). Even if the trailing double joint sheet pile is inclined at the maximum inclination angle in the wall thickness direction, the trailing double joint sheet pile is preceded by the joint portion where the protruding portion of the trailing double joint sheet pile is formed. Both of the joint portions can be fitted to both joint portions of the preceding double joint sheet pile.

  In particular, according to the fifth aspect of the present invention, the filler is provided in the space sandwiched between the joint portions, so that the hardened filler can contain the contaminated soil from the waste disposal site, or the contaminated water can flow out due to the groundwater flow. Can be reliably shut off, and can also be applied as a back-up function for a water shielding work by applying a water-swellable water shielding material to the joint.

It is a perspective view which shows the wall body constructed | assembled by connecting the double joint sheet pile to which this invention is applied. (A) is a top view which shows 1st Embodiment of the double joint sheet pile to which this invention is applied, (b) is the front view. (A) is a top view which shows the modification of 1st Embodiment of the double joint sheet pile to which this invention is applied, (b) is the front view. (A) is a front view which shows the protrusion location of a joint part in 1st Embodiment of the double joint sheet pile which applied this invention, (b) is the side view. (A) is a top view which shows 2nd Embodiment of the double joint sheet pile to which this invention is applied, (b) is the front view. (A) is a front view which shows the protrusion location of a joint part in 2nd Embodiment of the double joint sheet pile to which this invention is applied, (b) is the side view. (A) is a top view which shows the wall body constructed | assembled by connecting the double joint sheet pile to which this invention is applied, (b) is the front view. It is a side view which shows the state before a preceding double joint sheet pile and a back double joint sheet pile are connected by the joint part of a double joint by the double joint sheet pile to which this invention is applied. It is a side view which shows the state of the process in which a preceding double joint sheet pile and a back double joint sheet pile are connected by the joint part of a double joint by the double joint sheet pile to which this invention is applied. (A) is a top view which shows the state after the preceding double joint sheet pile and the subsequent double joint sheet pile were connected by the joint part of the double joint in the double joint sheet pile to which the present invention is applied. b) is a front view thereof. (A) is an enlarged plan view which shows the state which the joint part of the double joint fitted by the double joint sheet pile which applied this invention, (b) is the enlarged front view. In the double joint sheet pile which applied this invention, it is an enlarged side view which shows the state which makes the joint part of the double joint of a subsequent double joint sheet pile incline in the joint part of the double joint of a preceding double joint sheet pile. is there.

  Hereinafter, the form for implementing double joint sheet pile 1 to which the present invention is applied is explained in detail, referring to drawings.

  As shown in FIG. 1, the double joint sheet pile 1 to which the present invention is applied is used to construct a wall body 7 by connecting a plurality of pieces in the ground width direction X in the ground 8, and in the wall height direction. A main body portion 2 extending in Y and a double joint 3 in which a joint portion 4 is provided on the main body portion 2 as a pair in the wall thickness direction Z are provided.

  The wall body 7 is provided as a water shielding wall or the like so as to surround an existing or new waste disposal pump, for example, in order to contain contaminated soil or block outflow of contaminated water due to a groundwater flow. The wall body 7 is constructed by connecting the plurality of double joint sheet piles 1 to each other in the wall width direction X by fitting the joint portions 4 of the plurality of double joint sheet piles 1 to each other in the wall width direction X. Will be.

  As shown in FIG. 2, the double joint sheet pile 1 to which the present invention is applied uses a box-shaped member 21 having a substantially rectangular cross section as the main body 2 as shown in FIG. 2. At this time, as shown in FIG. 2A, the box-shaped member 21 is surrounded by a pair of short side portions 21a and a pair of long side portions 21b formed in a substantially flat plate shape.

  The box-shaped member 21 is manufactured using one square steel pipe. The box-shaped member 21 is not limited to this, and as shown in FIG. 3A, a plurality of the square members 21 combined with one square steel pipe and one or a plurality of H-shaped steels arranged side by side in the wall width direction X. It may be manufactured by welding and joining a square steel pipe divided into two along the wall height direction Y on both sides of the H-shaped steel.

  As shown in FIGS. 2A and 3A, the box-shaped member 21 is formed in a substantially flat plate shape at each of the four corners that are the boundary between the pair of short sides 21a and the pair of long sides 21b. A straight sheet pile 41 made of steel or the like is attached. 2 (b) and 3 (b), for example, the box-shaped member 21 has a height H extending in the wall height direction Y from the upper end 2a to the lower end 2b of the main body 2 from about 10 m to 30 m. And

  In the linear sheet pile 41, the joint portion 4 is formed on one end side 41a in the wall width direction X, and the joint portion 4 is not formed on the other end side 41b in the wall width direction X. The straight sheet pile 41 is formed by welding the other end side 41b where the joint portion 4 is not formed to each of the four corners of the box-shaped member 21 so that the one end side 41a where the joint portion 4 is formed becomes the wall width direction X It will be extended and arranged on both sides.

  The linear sheet piles 41 are attached to four locations at the four corners of the box-shaped member 21, and the joint portion 4 on one end side 41 a of the linear sheet pile 41 on each of the front side A and the rear side B in the wall thickness direction Z. Are arranged extending in the wall width direction X, so that the double joint 3 is attached to the box-shaped member 21 serving as the main body portion 2 by the joint portion 4 paired on the front side A and the back side B in the wall thickness direction Z. Will be provided.

  In the double joint 3, for example, the separation distance W of the joint portion 4 paired on the front side A and the back side B in the wall thickness direction Z is set to about 0.5 m to 3.0 m. The double joint 3 is provided so as to extend in the wall height direction Y along the box-shaped member 21 serving as the main body 2. For example, the double joint 3 extends over the entire length in the wall height direction Y of the box-shaped member 21. The height H extending in the direction Y is about 10 m to 30 m.

  In the double joint 3, a pair of joint parts 4 on the front side A and the back side B in the wall thickness direction Z is provided on each of both sides in the wall width direction X on the box-shaped member 21 serving as the main body part 2. . The double joint 3 extends from the four corners of the box-shaped member 21 to both sides in the wall width direction X, and is provided with joint portions 4 at four locations. For example, the joint portions 4 extending toward both sides in the wall width direction X The distance D in the wall width direction X is about 1.0 m to 6.0 m.

  As shown in FIG. 4, the double joint 3 includes a pair of joint parts 4 on the front side A and the back side B in the wall thickness direction Z, and the joint part 4 on the front side A in the wall thickness direction Z is a wall. It is provided so as to protrude downward in the wall height direction Y from the joint portion 4 on the back surface side B in the thickness direction Z.

  The double joint 3 is not limited to this, and the joint portion 4 on the back surface side B in the wall thickness direction Z protrudes downward in the wall height direction Y from the joint portion 4 on the front surface side A in the wall thickness direction Z. May be provided. Further, the double joint 3 is such that the joint portion 4 on the front side A or the back side B in the wall thickness direction Z is directed downward only in the wall height direction Y, upward only, or upward and downward. And may be provided so as to protrude.

  In the double joint 3, any one of the joint portions 4 paired in the wall thickness direction Z is either above or below in the wall height direction Y than any other joint portion 4 paired in the wall thickness direction Z. Either one or both of them are projected with a predetermined projection length L. In the double joint 3, the protruding portion 40 is formed in the joint portion 4 by causing the linear sheet pile 41 to protrude with a predetermined protrusion length L.

  In the double joint 3, a pair of joint parts 4 on the front side A and the back side B in the wall thickness direction Z are provided on both sides in the wall width direction X of the box-shaped member 21 serving as the main body part 2. And only one double joint 3 provided on one side in the wall width direction X, and one of the joint parts 4 paired in the wall thickness direction Z is one of the other joints paired in the wall thickness direction Z. It is provided so as to protrude downward in the wall height direction Y from the portion 4.

  At this time, the double joint 3 has only one joint part 4 out of the remaining three joint parts 4 among the joint parts 4 provided at the four corners of the box-shaped member 21. , And projecting downward in the wall height direction Y. In the double joint 3, the protruding portions 40 are formed only at one joint portion 4 among the joint portions 4 provided at four locations at the four corners of the box-shaped member 21.

  Next, 2nd Embodiment of the double joint sheet pile 1 to which this invention is applied is described. In addition, about the component same as the component mentioned above, the description below is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the double joint sheet pile 1 to which the present invention is applied, as shown in FIG. 5, a steel pipe 22 made of steel or the like formed in a cylindrical shape having a substantially circular cross section is used as the main body 2 in the second embodiment. . At this time, as shown in FIG. 5A, the steel pipe 22 is surrounded by an outer peripheral portion 22a having a substantially circular cross section.

  In the steel pipe joint 42, two male side joints 42 a extending in the wall width direction X are attached to the front side A and the back side B in the wall thickness direction Z on the one hand in the wall width direction X of the outer peripheral portion 22 a of the steel pipe 22. Thus, the double joint 3 is provided on the steel pipe 22 serving as the main body portion 2 by the joint portion 4 of the male side joint 42a paired on the front side A and the back side B in the wall thickness direction Z.

  In the double joint 3, for example, the separation distance W of the joint portion 4 paired on the front side A and the back side B in the wall thickness direction Z is set to about 0.5 m to 3.0 m. The double joint 3 is provided so as to extend in the wall height direction Y along the steel pipe 22 serving as the main body 2. For example, the double joint 3 extends in the wall height direction Y over the entire length in the wall height direction Y of the steel pipe 22. Height H shall be about 10-30 m.

  As shown in FIG. 6, the double joint 3 is either one of the male joints 42 a paired in the wall thickness direction Z and one of the joint parts 4 of the male side joint 42 a paired in the wall thickness direction Z. The other joint portion 4 is provided so as to protrude toward one or both of the upper and lower sides in the wall height direction Y. In the double joint 3, the protruding portion 40 is formed in the joint portion 4 by causing the male joint 42 a to protrude with a predetermined protrusion length L.

  In the double joint 3, only the joint part 4 of one male side joint 42a out of the male side joint 42a and the female side joint 42b provided at the four places on the outer peripheral part 22a of the steel pipe 22 is the remaining three places. From the male side joint 42a and the female side joint 42b, it is provided to protrude downward in the wall height direction Y, and the protruding part 40 is formed only in the joint part 4 of one male side joint 42a. .

  The double joint sheet pile 1 to which the present invention is applied is shown in FIG. 7 in both the first embodiment and the second embodiment. A trailing double joint sheet pile 12 embedded in the ground 8 is used by being connected in the wall width direction X.

  The double joint sheet pile 1 to which the present invention is applied is particularly used for the trailing double joint sheet pile 12, and the double joint 3 of each of the preceding double joint sheet pile 11 and the following double joint sheet pile 12 is used. The following double joint sheet pile 12 is connected to the preceding double joint sheet pile 11 by being opposed to each other.

  First, as shown in FIG. 8, the double joint sheet pile 1 to which the present invention is applied is embedded in the preceding double joint sheet pile 11 in advance in the ground 8. The joint part 4 of the joint 3 is provided in a pair in the wall thickness direction Z continuously from the upper end 2a to the lower end 2b of the main body part 2 of the preceding double joint sheet pile 11.

  Next, the double joint sheet pile 1 to which the present invention is applied is the front side of the subsequent double joint sheet pile 12 in which the protruding portion 40 is formed with respect to the joint portion 4 on the front side A of the preceding double joint sheet pile 11. The joint portion 4 of A is advanced from the protruding portion 40 and is slid from above in the wall height direction Y to be fitted.

  Next, as shown in FIG. 9, the double joint sheet pile 1 to which the present invention is applied is formed by replacing the joint portion 4 on the front side A of the subsequent double joint sheet pile 12 in which the protruding portion 40 is formed with the preceding double joint. While being fitted to the joint portion 4 on the front side A of the sheet pile 11, the rear side of the trailing double joint sheet pile 12 in which the protruding portion 40 is not formed on the joint portion 4 on the back side B of the preceding double joint sheet pile 11. The joint portion 4 of B is slid from above the wall height direction Y and fitted.

  As shown in FIG. 10, the double joint sheet pile 1 to which the present invention is applied is finally connected to both joint portions 4 of the double joint 3 of the preceding double joint sheet pile 11 with two of the subsequent double joint sheet piles 12. Both joint portions 4 of the heavy joint 3 are fitted to each other over the entire length of the main body portion 2 in the wall height direction Y, and are fitted to each other on the front side A and the back side B in the wall thickness direction Z. A wall body 7 having a double water-impervious structure by the joint portion 4 thus constructed is constructed.

  As shown in FIG. 11, the double joint sheet pile 1 to which the present invention is applied is a double joint 3 opposed to each other in the wall width direction X, and when a plurality of joint portions 4 are fitted to each other, A gap G is formed inside the joint portion 4. In the double joint sheet pile 1 to which the present invention is applied, the gap G is formed inside the joint portion 4, so that the gap G having a predetermined interval α in the wall thickness direction Z is mutually connected in the wall thickness direction Z. The joint part 4 can be moved, and the joint parts 4 can be easily fitted together.

  As shown in FIG. 11A, the double joint sheet pile 1 to which the present invention is applied has, for example, a water-swellable material mainly composed of polyurethane or the like inside the joint portion 4 in a state of being fitted to each other. A water shielding material 5 having a water shielding property of 5 is provided by coating or filling. The double joint sheet pile 1 to which the present invention is applied is provided with a water shielding material 5 such as a water-swellable material inside the joint part 4, thereby improving the water stoppage of the joint part 4 in a mutually fitted state. It will be.

  The double joint sheet pile 1 to which the present invention is applied has a range R in the wall height direction Y along the main body 2 except for a portion where the protruding portion 40 is formed, as shown in FIGS. Only, the water shielding material 5 is provided inside the joint part 4 of the following double joint sheet pile 12, and both joint parts 4 of the following double joint sheet pile 12 are connected to both of the preceding double joint sheet piles 11. The joint 4 is fitted.

  As shown in FIG. 12, the double joint sheet pile 1 to which the present invention is applied has either one joint part 4 paired in the wall thickness direction Z and one joint part paired in the wall thickness direction Z. 4, the protruding length L of the protruding portion 40 that protrudes upward or downward in the wall height direction Y is provided to satisfy the relationship defined by the following equation (1).

  At this time, the double joint sheet pile 1 to which the present invention is applied is one of the joint portions 4 of the double joint 3 paired with the front side A and the back side B in the wall thickness direction Z. A protruding length L in which the joint portion 4 is protruded upward or downward in the wall height direction Y from the other joint portion 4 in the wall thickness direction Z is, for example, 20 mm to 60 mm. Here, W: separation distance of the joint portion 4 paired in the wall thickness direction Z, α: an interval of the gap G formed inside the joint portion 4 when the plurality of joint portions 4 are fitted to each other. To do.

  The double joint sheet pile 1 to which the present invention is applied precedes the preceding double joint sheet pile 11 and suspends the subsequent double joint sheet pile 12 embedded in the following while being affected by the wind. The joint part 4 of the row double joint sheet pile 12 is fitted to the joint part 4 of the preceding double joint sheet pile 11. For this reason, in the double joint sheet pile 1 to which the present invention is applied, the subsequent double joint sheet pile 12 is inclined in the wall thickness direction Z at a predetermined inclination angle θ due to the influence of wind or the like.

  In the double joint sheet pile 1 to which the present invention is applied, the lower end portion 40a of the protruding portion 40 formed on the joint portion 4 on the front side A of the subsequent double joint sheet pile 12 is on the front side A of the preceding double joint sheet pile 11. The lower end portion 4a of the joint portion 4 on the back side B that does not form the protruding portion 40 of the subsequent double joint sheet pile 12 in the state of being in contact with the side surface 4b of the joint portion 4 is the rear surface of the preceding double joint sheet pile 11. By being brought into contact with the side surface 4 b of the joint portion 4 on the side B, both the joint portions 4 of the trailing double joint sheet pile 12 are fitted to both joint portions 4 of the preceding double joint sheet pile 11. It will be something that can be made.

  For this reason, the double joint sheet pile 1 to which the present invention is applied has the rear joint part 4 of the trailing double joint sheet pile 12 to be fitted to both joint parts 4 of the preceding double joint sheet pile 11. The maximum inclination angle θ of the row double joint sheet pile 12 is defined by the following equation (2) in relation to the protrusion length L of the protrusion portion 40 and the gap α of the gap G formed inside the joint portion 4. It is necessary to satisfy this relationship.

  The double joint sheet pile 1 to which the present invention is applied forms a protruding portion 40 of the subsequent double joint sheet pile 12 when the subsequent double joint sheet pile 12 is inclined at the maximum inclination angle θ in the wall thickness direction Z. In order to fit the joint part 4 on the back side B, which is not present, to the joint part 4 on the back side B of the preceding double joint sheet pile 11, the maximum inclination angle θ of the double joint sheet pile 12 is It is necessary to satisfy the relationship defined by the following equation (3) in the relationship between the separation distance W of the joint portion 4 paired with Z and the distance α of the gap G formed inside the joint portion 4. It becomes.

  In the double joint sheet pile 1 to which the present invention is applied, the protrusion length L of the protruding portion 40 satisfies the relationship defined by the above expression (1) from the above expressions (2) and (3). Even if the following double joint sheet pile 12 is inclined in the wall thickness direction Z by the maximum inclination angle θ due to the influence of wind or the like, the joint portion in which the protruding portion 40 of the following double joint sheet pile 12 is formed. 4, both joint parts 4 of the trailing double joint sheet pile 12 can be fitted to both joint parts 4 of the preceding double joint sheet pile 11.

  As shown in FIG. 7, the double joint sheet pile 1 to which the present invention is applied is provided with joint parts 4 at two locations in the wall thickness direction Z, so that the double joint sheet pile 1 is a double joint by the joint parts 4 paired in the wall thickness direction Z. The water-impervious structure provides a backup function to the wall body 7 such as a water-impervious wall, so that it is possible to contain the contaminated soil from the waste disposal site and to prevent the outflow of the contaminated water due to the underground water flow. . In particular, as shown in FIG. 11, the double joint sheet pile 1 to which the present invention is applied has a water shielding material 5 having a water shielding property such as a water-swellable material inside the joint portion 4 in a state of being fitted to each other. By being provided, it is possible to improve the water-stopping property of the joint portion 4 in a state of being fitted to each other, and to significantly improve the backup function of the wall body 7.

  Moreover, the double joint sheet pile 1 to which the present invention is applied has only the range R in the wall height direction Y along the main body portion 2 except for the portion where the protruding portion 40 is formed. A water shielding material 5 is provided inside the joint portion 4. Thereby, the double joint sheet pile 1 to which the present invention is applied is preceded by the joint portion 4 in which the protruding portion 40 of the subsequent double joint sheet pile 12 is formed, and the leading double joint sheet pile from above the wall height direction Y. 11, when the sliding portion 4 is slid to the joint portion 4, the water shielding material 5 on the inner side of the joint portion 4 is prevented from becoming an obstacle to fitting at the protruding portion 40, and the joint portion 4 of the trailing double joint sheet pile 12 The fitting operation with the joint portion 4 of the preceding double joint sheet pile 11 can be made smooth.

  As shown in FIG. 7, the double joint sheet pile 1 to which the present invention is applied may be filled with a filler 6 such as soil cement or concrete in a space S sandwiched between the joint portions 4. As a result, the double joint sheet pile 1 to which the present invention is applied is provided with the filler 6 in the space S sandwiched between the joint portions 4, so that the hardened filler 6 can remove the contaminated soil from the waste disposal site. Containment and outflow of contaminated water due to the groundwater flow can be reliably blocked, and can also be applied as a backup function for a water shielding work by applying a water-swellable water shielding material to the joint portion 4.

  The double joint sheet pile 1 to which the present invention is applied is sandwiched between the pair of joint portions 4 in the wall thickness direction Z, so that a space S is formed between the pair of joint portions 4 in the wall thickness direction Z. Is done. Thereby, the double joint sheet pile 1 to which the present invention is applied uses the space S between the joint portions 4 paired in the wall thickness direction Z, and the fitting location of the joint portion 4 continuous in the wall height direction Y. Among them, it is possible to carry out monitoring for specifying a fitting portion where the water stoppage of the joint portions 4 in a state of being fitted to each other is insufficient.

  In the double joint sheet pile 1 to which the present invention is applied, any one of the joint portions 4 of the double joint 3 paired in the wall thickness direction Z is any of the double joint 3 paired in the wall thickness direction Z. Even if the trailing double joint sheet pile 12 swings due to the influence of wind or the like by being provided to project downward from the other joint portion 4 in the wall height direction Y, the trailing two After fitting one joint part 4 in which the protruding portion 40 of the double joint sheet pile 12 is formed in advance to one joint part 4 of the preceding double joint sheet pile 11, the other of the subsequent double joint sheet pile 12 is provided. This joint part 4 can be fitted to the other joint part 4 of the preceding double joint sheet pile 11, and the fitting position alignment of both joint parts 4 can be carried out easily and quickly. .

  Moreover, the double joint sheet pile 1 to which the present invention is applied is a double joint 3 in which any one joint portion 4 of the double joint 3 paired in the wall thickness direction Z is paired in the wall thickness direction Z. Even if the succeeding double joint sheet pile 12 swings due to the influence of wind or the like, the rear joint part 4 is provided rearwardly projecting from the other joint part 4 in the wall height direction Y. After fitting one joint part 4 of row double joint sheet pile 12 ahead of one joint part 4 in which protruding part 40 of preceding double joint sheet pile 11 is formed, subsequent double joint sheet pile 12 The other joint part 4 can be fitted to the other joint part 4 of the preceding double joint sheet pile 11, and the fitting position of both joint parts 4 can be simply and quickly implemented. It becomes.

  Thereby, the double joint sheet pile 1 to which the present invention is applied provides a backup function to the wall body 7 such as a water shielding wall and also provides a monitoring function of a fitting portion of the joint part 4. In addition to improving the reliability of the wall body 7 and the like, it is possible to easily and quickly carry out the fitting position adjustment of both the joint portions 4 of the double joint 3 paired in the wall thickness direction Z.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

1: Double joint sheet pile 11: Leading double joint sheet pile 12: Subsequent double joint sheet pile 2: Body part 21: Box-shaped member 21a: Short side part 21b: Long side part 22: Steel pipe 22a: Outer peripheral part 3: Two Heavy joint 4: Joint part 40: Projection location 41: Straight sheet pile 41a: One end side 41b: Other end side 42: Steel pipe joint 42a: Male side joint 42b: Female side joint 5: Water shielding material 6: Filler 7: Wall Body 8: Ground A: Front side B: Back side X: Wall width direction Y: Wall height direction Z: Wall thickness direction

Claims (5)

It is a double joint sheet pile for building a wall body by connecting in the wall width direction in the ground,
A main body portion extending in the wall height direction, and a double joint in which a joint portion is provided on the main body portion as a pair on the front side and the back side in the wall thickness direction,
The double joint is provided to extend in the wall height direction along the main body part, and either one of the joint parts paired in the wall thickness direction is paired in the wall thickness direction. The double joint sheet pile is provided so as to protrude from the joint portion toward one or both of the upper and lower sides in the wall height direction. In the double joint, the pair of joint parts on the front side and the back side in the wall thickness direction are provided on both sides of the main body part in the wall width direction, and provided on one side in the wall width direction. Only one of the above-described double joints, and either one of the joint parts paired in the wall thickness direction protrudes downward in the wall height direction from either one of the paired joint parts in the wall thickness direction. The double joint sheet pile according to claim 1, wherein the double joint sheet pile is provided. The double joint is provided such that any one of the joint parts paired in the wall thickness direction protrudes downward in the wall height direction from either of the paired joint parts in the wall thickness direction. The double joint sheet pile according to claim 1, wherein a water shielding material is provided inside the joint portion only in a range in a wall height direction along the main body portion. In the double joint, one of the joint portions paired in the wall thickness direction is protruded upward or downward in the wall height direction from the other joint portion paired in the wall thickness direction. The double joint sheet pile according to any one of claims 1 to 3, wherein the protruding length L is provided so as to satisfy a relationship defined by the following expression (1).

Here, W is the distance between the joint portions paired in the wall thickness direction, and α is the interval between the gaps formed inside the joint portions when the plurality of joint portions are fitted together. The double joint sheet pile according to any one of claims 1 to 4, wherein the main body is a box-shaped member formed in a box shape having a substantially rectangular cross section.

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