JP6091440B2 - Steel sheet pile foundation structure - Google Patents

Description

  The present invention relates to a steel sheet pile foundation structure in which a plurality of steel sheet piles are provided downward from a footing.

  Conventionally, a steel sheet pile foundation structure disclosed in Patent Document 1 has been proposed for the purpose of supporting a footing by a plurality of steel sheet piles erected on the ground.

  The steel sheet pile foundation structure disclosed in Patent Document 1 is a steel sheet pile wall body joined to the footing on the front and back surfaces of the footing, and a long steel sheet pile with a closed steel material attached to the tip to reach the support layer of the ground. And a short steel sheet pile that does not allow the tip to reach the support layer of the ground.

JP 2010-209548 A

  In the steel sheet pile foundation structure disclosed in Patent Document 1, the lower end portion of the long steel sheet pile to which the closed steel material is attached is fixed to the support layer, and the upper end of the short steel sheet pile and the long steel sheet pile coupled to the footing. The part is fixed to the footing, and the short steel sheet pile and the long steel sheet pile resist the load acting from the footing.

  At this time, in the steel sheet pile foundation structure disclosed in Patent Document 1, when a large horizontal load is applied from the footing, a large bending moment is generated by the long steel sheet pile having a long length in the material axis direction.

  In particular, in the steel sheet pile foundation structure disclosed in Patent Document 1, when the soft ground layer is thick between the ground surface and the support layer, the span length of the long steel sheet pile is increased. An excessive bending moment is generated in the front and rear steel sheet pile walls orthogonal to the sheet pile cross section, and in the side steel sheet pile walls parallel to the direction of the horizontal load, in the strong axis direction of the sheet pile cross section. It will be a thing.

  For this reason, in the steel sheet pile foundation structure disclosed in Patent Document 1, before the vertical supporting force of the long steel sheet pile that resists the vertical load acting from the footing is exhibited, the long steel sheet pile is caused by an excessive bending moment. By yielding, there was a possibility that the effect as a vertical support material by a long steel sheet pile could not be fully exhibited.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to a steel sheet pile attached to the footing, particularly for horizontal loads of front and rear long sheet piles and side long sheet piles. An object of the present invention is to provide a steel sheet pile foundation structure capable of preventing the bending and yield deformation and sufficiently exhibiting the vertical supporting force of the front and rear long sheet piles and the side long sheet piles on which the tip processed portions are formed.

  The steel sheet pile foundation structure according to the first invention is a steel sheet pile foundation structure in which a plurality of steel sheet piles are provided downward from the footing, and a front and rear sheet pile group provided downward from the front and rear surfaces of the footing, A side sheet pile group provided downward from both side surfaces, the front and rear sheet pile groups are front and rear long sheet piles that are erected up to the supporting ground with the front and rear reinforcing members attached, and front and rear erected up to the soft ground Short side sheet piles are provided side by side, and the side sheet pile group includes side side long sheet piles that are erected up to the supporting ground with side reinforcing members attached, and side short sheet piles that are erected up to the soft ground. Are arranged side by side, and the front and rear long sheet piles are formed with a tip processing portion at a tip portion embedded in a supporting ground, and from the connection portion embedded inside a footing, In order to resist bending moment acting on soft ground in a depth range up to a position where the depth is 1/2 or less of the extension length provided between the lower end of the short sheet pile and the supporting ground, The front / rear reinforcing member is fixed in the material axis direction of the front / rear long sheet pile.

  In the steel sheet pile foundation structure according to the second invention, in the first invention, the side long sheet pile is formed with a tip processing portion at a tip portion embedded in the supporting ground, and from a connection portion embedded inside the footing, To resist bending moment acting on soft ground in a depth range up to a position where the depth is 1/2 or less of the extension length provided between the lower end of the side short sheet pile and the supporting ground. The side reinforcing members are fixed in the material axis direction of the side long sheet piles, and the plurality of side reinforcing members are fixed to each of the plurality of side long sheet piles. When the rigidity or strength is less than half or when a stiffener having the same specifications as the front and rear reinforcing members is used, the front and rear reinforcing members are arranged in two rows for each of the front and rear long sheet piles, Said side reinforcement Material is characterized in that it is arranged one by one column with respect to said side elongate sheet pile.

  In the steel sheet pile foundation structure according to the third invention, in the first invention or the second invention, the front-rear reinforcing member is an H-shaped member formed in a substantially H-shaped cross section and extending in the material axis direction of the front-rear long sheet pile. In addition, the flange portion at one end of the H-shaped member is in contact with the longitudinal longitudinal sheet pile.

  The steel sheet pile foundation structure according to a fourth aspect of the present invention is the third aspect of the invention, wherein the longitudinal longitudinal sheet pile uses a hat-shaped steel sheet pile or U-shaped steel sheet pile in which a groove is formed by a web and a pair of flanges, The front / rear reinforcing member is fixed to the front / rear long sheet pile so that the flange portion at the other end of the shape member is disposed on the inner side or footing side of the groove portion.

  The steel sheet pile foundation structure according to a fifth aspect of the present invention is any one of the first to fourth aspects of the present invention, wherein the side reinforcing member is a steel sheet extending in the axial direction of the side long sheet pile. And one end of each steel plate is brought into contact with the long side sheet pile.

  The steel sheet pile foundation structure according to a sixth aspect of the present invention is the fifth aspect of the present invention, wherein the side reinforcing member is spaced apart from the neutral axis in the strong axial direction of the sheet pile cross section of the side long sheet pile, It is fixed to the both sides of the side long sheet pile so as to be substantially parallel to the neutral axis in the strong axis direction.

  In the steel sheet pile foundation structure according to a seventh aspect of the present invention, in the fifth or sixth aspect of the invention, the side long sheet pile is a hat-shaped steel sheet pile or U-shaped steel sheet pile in which a groove is formed by a web and a pair of flanges. The side reinforcing member is fixed to the side long sheet pile so that the other end of each steel plate is disposed on the inner side or footing side of the groove.

  In the steel sheet pile foundation structure according to the eighth invention, in the first invention or the second invention, the front / rear reinforcing member and the side reinforcing member have substantially the same cross-sectional shape as the front / rear long sheet pile or the side long sheet pile. Is used.

  A steel sheet pile foundation structure according to a ninth invention is the hat-type steel sheet pile according to the first invention or the second invention, wherein the longitudinal long sheet pile and the side long sheet pile are formed with a groove portion by a web and a pair of flanges. A U-shaped steel sheet pile is used, and the steel plate is installed so as to close the groove, so that the front / rear reinforcing member is fixed to the front / rear long sheet pile, or the side reinforcing member is attached to the side long sheet pile. It is fixed.

  The steel sheet pile foundation structure according to a tenth aspect of the invention is any one of the first to ninth aspects of the invention, wherein the front / rear reinforcing member and the side reinforcing member are inside the footing together with the front / rear long sheet pile and the side long sheet pile. At the upper end portion to be embedded, a hole penetrating in the direction perpendicular to the material axis of the longitudinal longitudinal sheet pile and the side long sheet pile, a concave portion recessed in the direction perpendicular to the material axis, or a convex part protruding in the direction perpendicular to the material axis is formed. It is characterized by being.

  A steel sheet pile foundation structure according to an eleventh aspect of the invention is any one of the first to tenth aspects of the invention, wherein the front and rear long sheet piles and the side long sheet pile support the front and rear long sheet piles and the side long sheet pile. It is characterized by being reinforced by using a water jet pipe used when standing up to.

  A steel sheet pile foundation structure according to a twelfth aspect of the invention is any one of the first to eleventh aspects of the invention, wherein the front / rear reinforcing member or the side reinforcing member is provided on either or both of the front / rear short sheet pile and the side short sheet pile. Is also attached.

  According to the first invention to the twelfth invention, in the steel sheet pile installed in the soft ground, particularly in the front and rear long sheet piles and the side long sheet piles which are fixed by the footing and the support layer and the distance therebetween becomes long. The bending moment concentrates on the ground side near the footing where the horizontal load of soft ground acts, and a bending moment with a specific distribution is generated, but in order to be able to resist this specific bending moment, The front and rear reinforcing members or the side reinforcing members are fixed and reinforced in a predetermined depth range of the sheet pile group and the side sheet pile group, particularly the front and rear long sheet piles or the side long sheet piles.

  Thereby, according to 1st invention-12th invention, it resists with the front-rear reinforcement member and the side reinforcement member with respect to the specific bending moment which generate | occur | produces in the front-back sheet pile group and the side sheet pile group, and prevents the yield deformation of a sheet pile. It becomes possible to do. According to the first to twelfth inventions, in particular, the vertical supporting force of the front and rear long sheet piles and the side long sheet piles in which the tip processed portion is formed by preventing the yield deformation of the front and rear long sheet piles and the side long sheet piles. Can be fully exhibited.

  Moreover, according to 1st invention-12th invention, since the reinforcement of a sheet pile can be implemented simply by fixing a front-rear reinforcement member or a side reinforcement member to a front-rear sheet pile group or a side sheet pile group, It is possible to reinforce the sheet pile easily and at low cost without the need to pull up the model or use high-strength steel.

  According to the second invention, a horizontal load acts on the pier supporting the footing, rotational deformation occurs in the footing, the bending moment is concentrated on the ground side close to the footing of the side sheet pile group, and the bending moment has a specific distribution. Will occur.

  According to the second invention, the side sheet pile group, unlike the front and rear sheet pile groups, resists bending moment in the strong axis direction of the steel sheet pile cross section, so that the bending rigidity in the strong axis direction is at least the bending rigidity in the weak axis direction. Since the rigidity and strength of the side reinforcement members are less than half that of the front and rear reinforcement members, they can resist the same bending moment, and the yield deformation of the side sheet piles can be effectively prevented. It becomes possible to reinforce the side sheet pile. When using stiffeners having the same specifications as the front and rear reinforcing members, the front and rear reinforcing members are arranged in two rows for each of the front and rear long sheet piles, and the side reinforcing members are arranged in one row for the side long sheet piles. Thus, excessive reinforcement can be prevented and an efficient and economical reinforcement method can be obtained, and workability and material procurement can be improved by limiting the specification of the reinforcing material to one.

  According to the tenth aspect of the invention, since the hole, the concave portion, or the convex portion is formed at the upper ends of the front and rear reinforcing members and the side reinforcing members, the upper ends of the front and rear reinforcing members and the side reinforcing members are embedded inside the footing. In this state, the adhesion strength with the footing can be reliably improved. As a result, even when an excessive shearing force or bending moment is generated in the joint portion, the joint portion can be prevented from being broken and the function as the foundation structure can be maintained.

It is a perspective view which shows the steel sheet pile foundation structure to which this invention is applied. It is a front view which shows the front and back sheet pile group of the steel sheet pile foundation structure to which this invention is applied. (A) is a top view which shows the hat-shaped steel sheet pile of the long sheet pile and short sheet pile of the steel sheet pile foundation structure to which this invention is applied, (b) is a top view which shows the U-shaped steel sheet pile. (A) is a front view which shows the front end process part formed in the long sheet pile of the steel sheet pile foundation structure to which this invention is applied, (b) is the top view. (A) is a front view which shows the front-back reinforcement member fixed to the longitudinal longitudinal sheet pile of the steel sheet pile foundation structure to which this invention is applied, (b) is the top view. It is a front view which shows the depth range of the front-back reinforcement member of the steel sheet pile foundation structure to which this invention is applied. It is a perspective view which shows the front-rear reinforcement member of the steel sheet pile foundation structure to which this invention is applied. It is a front view which shows the front and back short sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a side view which shows the side sheet pile group of the steel sheet pile foundation structure to which this invention is applied. (A) is a side view which shows the side reinforcement member fixed to the side long sheet pile of the steel sheet pile foundation structure to which this invention is applied, (b) is the top view. It is a top view which shows the side reinforcement member fixed to the hat-shaped steel sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a top view which shows the side reinforcement member fixed to the flange of the U-shaped steel sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a top view which shows the side reinforcement member fixed to the web of the U-shaped steel sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a side view which shows the depth range of the side reinforcement member of the steel sheet pile foundation structure to which this invention is applied. It is a perspective view which shows the side reinforcement member of the steel sheet pile foundation structure to which this invention is applied. It is a side view which shows the side short sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a top view which shows the 1st modification of the front and back reinforcement member of the steel sheet pile foundation structure to which this invention is applied, and a side reinforcement member. It is a top view which shows the 2nd modification of the front-rear reinforcement member and side reinforcement member of the steel sheet pile foundation structure to which this invention is applied. It is a front view which shows the bending moment which acts on the longitudinal longitudinal sheet pile of the steel sheet pile foundation structure to which this invention is applied. It is a side view which shows the bending moment which acts on the side long sheet pile of the steel sheet pile foundation structure to which this invention is applied.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the steel sheet pile foundation structure 1 to which this invention is applied is demonstrated in detail, referring drawings.

  In the steel sheet pile foundation structure 1 to which the present invention is applied, a plurality of steel sheet piles are provided downward from the footing 21 as shown in FIG. The footing 21 is embedded in the vicinity of the ground surface of the soft ground 81 and supports a structure such as the bridge 23 constructed above the pier 22.

  The steel sheet pile foundation structure 1 to which the present invention is applied has the front and rear sheet pile groups 3 provided on the front surface 21a and the rear surface 21b of the footing 21 on both sides in the width direction Z of the bridge 23 and the both sides in the length direction of the bridge 23 and the like. The side sheet pile group 4 provided on the left side surface 21c and the right side surface 21d of the footing 21 is provided.

  The steel sheet pile foundation structure 1 to which the present invention is applied is provided with the front and rear sheet pile groups 3 and the side sheet pile groups 4 extending downward in the ground so that the front surface 21a, the rear surface 21b, the left side surface 21c of the footing 21 and The right side surface 21d is surrounded by a plurality of steel sheet piles from four directions.

  As shown in FIG. 2, the front and rear sheet pile group 3 includes a plurality of front and rear long sheet piles 31 embedded and standing so as to reach the support ground 82 from the vicinity of the ground surface, and the ground surface without reaching the support ground 82. And a plurality of front and rear short sheet piles 32 embedded in the soft ground 81 from the vicinity.

  The front and rear sheet pile group 3 has a plurality of front and rear sheet piles such that all or a part of the plurality of front and rear short sheet piles 32 and the front and rear long sheet piles 31 are adjacent to each other in the left and right direction X in the ground which is the length direction of the bridge 23 and the like. A long sheet pile 31 and a plurality of front and rear short sheet piles 32 are arranged side by side.

  As shown in FIG. 3A, the front / rear long sheet pile 31 and the front / rear short sheet pile 32 are provided so that the groove portion 50 is formed by the flange 51 and the pair of webs 52 and extends from the pair of webs 52. A hat-shaped steel sheet pile 5 in which a joint 54 is formed at the end of the arm 53 is used. The front and rear long sheet piles 31 and the front and rear short sheet piles 32 are not limited to this, and a groove portion 50 is formed by a flange 51 and a pair of webs 52 as shown in FIG. A U-shaped steel sheet pile 55 having a joint 54 formed on the part may be used.

  As shown in FIGS. 4 and 5, the front and rear long sheet pile 31 is provided with a tip processing portion 56 at a tip portion 31 a that is erected in the ground and embedded in the support ground 82. A longitudinal reinforcing member 6 extending in the height direction Y in the ground in the material axis direction is attached to the flange 51.

  The front and rear elongate sheet pile 31 may be reinforced using a water jet pipe 59 attached to the arm 53 or the like, if necessary. The water jet pipe 59 is used to dig the soft ground 81 and the supporting ground 82 while ejecting water at a predetermined pressure, and is used when the front and rear long sheet piles 31 are erected to the supporting ground 82. .

  As shown in FIG. 4, the front end processed portion 56 has a substantially hat-shaped or substantially cross-sectional shape so as to close the groove portion 50 of the front and rear long sheet pile 31 from the front end portion 31 a of the front and rear long sheet pile 31 embedded in the support ground 82. A U-shaped steel sheet pile for a processing part is attached by welding or the like. When the hat-shaped steel sheet pile is used, the joint portion is cut so as not to interfere with the joint 54 of the longitudinal long sheet pile 31. As shown in FIG. 5A, the front and rear long sheet pile 31 is attached with the front and rear reinforcing members 6 spaced apart from the upper end, thereby forming a chuck portion 24 for gripping with a chuck such as a vibro hammer.

  As shown in FIG. 5 (b), the front and rear reinforcing member 6 includes one end flange portion 61 that is in contact with the front and rear long sheet pile 31, the other end flange portion 62 provided substantially parallel to the one end flange portion 61, and one end An H-shaped member having a web portion 63 installed on the flange portion 61 and the other end flange portion 62 and having a substantially H-shaped cross section is used. The front / rear reinforcing member 6 has one end flange portion 61 fixed to the flange 51 of the front / rear long sheet pile 31 by welding or the like so that it can resist the bending moment acting on the sheet pile in the strong axis direction. Is disposed inside the groove 50. The front-rear reinforcing member 6 can be accommodated in the inner side B of the groove portion 50, thereby suppressing an increase in construction space and suppressing an increase in resistance during placing. However, the front and rear reinforcing members 6 may jump out from the inside of the groove portion 50. At this time, it is desirable to attach the front and rear reinforcing members 6 to the footing side so that the entire construction space does not increase.

  As shown in FIG. 6, the front / rear reinforcing member 6 is fixed to the connection portion 57 of the front / rear long sheet pile 31 embedded inside the footing 21 in the vicinity of the ground surface of the soft ground 81, along with the front / rear long sheet pile 31. The upper end portion 6 a of the reinforcing member 6 is embedded inside the footing 21. The front and rear reinforcing member 6 is 1/3 of the extension length L of the front and rear long sheet pile 31 provided between the lower end portion 32a of the front and rear short sheet pile 32 and the support ground 82 from the connection portion 57 of the front and rear long sheet pile 31. It is attached to a predetermined depth range h up to a position where the depth is ½.

  As shown in FIG. 7, the front-rear reinforcing member 6 is made of a perforated steel plate or a striped steel plate for the web portion 63 of the upper end portion 6 a of the front-rear reinforcing member 6 embedded inside the footing 21. At this time, as shown in FIG. 7 (a), the front / rear reinforcing member 6 has a hole 63a penetrating the web surface in the direction perpendicular to the material axis of the front / rear long sheet pile 31, or as shown in FIG. 7 (b). A concave portion 63b that is depressed on the web surface, or a convex portion 63c that is raised on the web surface, as shown in FIG. 7C, is formed.

  As shown in FIG. 8, the front and rear short sheet piles 32 are connected in a state where the other front and rear short sheet piles 32 or other front and rear long sheet piles 31 adjacent to each other in the horizontal direction X in the ground and the joints 54 are fitted to each other. Is done. The front and rear short sheet piles 32 are embedded inside the footing 21 together with the front and rear long sheet piles 31 with a diver 58 and the like attached to a connecting portion 57 embedded inside the footing 21. Alternatively, the front and rear short sheet piles 32 are embedded in the footing 21 with the front and rear reinforcing members 6 attached thereto in the same manner as the front and rear long sheet piles 31. At this time, the length of the front / rear reinforcing member 6 attached to the front / rear short sheet pile 32 is equal to or shorter than the length of the front / rear short sheet pile 32.

  As shown in FIG. 9, the side sheet pile group 4 includes a plurality of side long sheet piles 41 embedded and standing so as to reach the support ground 82 from the vicinity of the ground surface, and the ground surface without reaching the support ground 82. And a plurality of short side sheet piles 42 erected and embedded in the soft ground 81 from the vicinity.

  The side sheet pile group 4 has a plurality of side surfaces such that all or a part of the plurality of side short sheet piles 42 and the side long sheet pile 41 are adjacent to each other in the front-rear direction Z in the ground which is the width direction Z of the bridge 23 and the like. A long sheet pile 41 and a plurality of side short sheet piles 42 are arranged side by side.

  As shown in FIG. 3A, the side long sheet pile 41 and the side short sheet pile 42 are provided so that the groove portion 50 is formed by the flange 51 and the pair of webs 52 and extends from the pair of webs 52. A hat-shaped steel sheet pile 5 in which a joint 54 is formed at the end of the arm 53 is used. The side long sheet pile 41 and the side short sheet pile 42 are not limited to this, and as shown in FIG. 3B, the groove portion 50 is formed by the flange 51 and the pair of webs 52, and the ends of the pair of webs 52 are formed. A U-shaped steel sheet pile 55 having a joint 54 formed on the part may be used.

  As shown in FIGS. 4 and 10, the side long sheet pile 41 is formed in a tip end portion 41 a that is erected in the ground and embedded in the support ground 82. A side reinforcing member 7 extending in the height direction Y in the ground in the material axis direction is attached to the arm 53.

  Side long sheet pile 41 may be reinforced using water jet pipe 59 attached to arm 53 grade as needed. The water jet pipe 59 digs the soft ground 81 and the supporting ground 82 while ejecting water at a predetermined pressure, and is used when the side long sheet pile 41 is erected to the supporting ground 82. .

  As shown in FIG. 4, the distal end processing portion 56 closes the groove 50 of the side long sheet pile 41 from the tip end portion 41 a of the side long sheet pile 41 embedded in the support ground 82, or has a substantially hat-shaped cross section. A U-shaped steel sheet pile for a processing part is attached by welding or the like. When the hat-shaped steel sheet pile is used, the joint portion is cut so as not to interfere with the joint 54 of the long side sheet pile 41.

  As shown in FIG. 10 (b), the side reinforcing member 7 includes a long side one end portion 71 that is in contact with the side long sheet pile 41, and a long side provided substantially parallel to the long side one end portion 71. A substantially flat steel plate having an end 72 is used. The side reinforcing member 7 is attached to both side portions of the side long sheet pile 41 as a pair of steel plates or the like extending in the material axis direction of the side long sheet pile 41.

  As shown in FIG. 11, when the hat-shaped steel sheet pile 5 is used for the side long sheet pile 41, the side reinforcing member 7 has one end 71 on the long side welded to the arm 53 of the side long sheet pile 41. Fixed. Further, as shown in FIGS. 12 and 13, when the U-shaped steel sheet pile 55 is used for the side long sheet pile 41, the side reinforcing member 7 has a long side on the flange 51 or the web 52 of the side long sheet pile 41. Is fixed by welding or the like. The side reinforcing member 7 is fixed so as to be substantially parallel to the strong axis neutral axis N while being separated from the strong axis neutral axis N of the cross section of the side long sheet pile 41 with respect to the acting direction of the horizontal load P.

  As shown in FIG. 12, when the U-shaped steel sheet pile 55 is used for the side long sheet pile 41, the side reinforcing member 7 is fixed to the flange 51 of the side long sheet pile 41 by welding or the like. The welding operation of the one end portion 71 becomes easy. As shown in FIG. 13, when the U-shaped steel sheet pile 55 is used for the side long sheet pile 41, the side reinforcing member 7 is strongly axially fixed when fixed to the web 52 of the side long sheet pile 41 by welding or the like. The distance from the neutral axis N can be increased.

  As shown in FIG. 11, when the hat-shaped steel sheet pile 5 is used for the side long sheet pile 41, each of the side reinforcing members 7 is not protruded from the flange 51 of the adjacent side short sheet pile 42. The other end portion 72 of the steel plate is disposed and fixed on the wall inner side A of the side sheet pile group 4. Further, as shown in FIGS. 12 and 13, when the U-shaped steel sheet pile 55 is used for the side long sheet pile 41, the side reinforcing member 7 does not protrude the steel plate from the flange 51 of the adjacent side short sheet pile 42. As described above, the other end 72 of each steel plate is arranged and fixed on the wall inner side A of the side sheet pile group 4. The side reinforcing member 7 may be attached to either the front side or the back side of the U-shaped steel sheet pile 55 as long as it fits inside the wall inner side A. The side reinforcing member 7 can be kept inside the groove portion 50 to suppress an increase in construction space, and an increase in resistance at the time of placing can also be suppressed. However, the side reinforcing member 7 may jump out from the inside of the groove portion 50. At this time, it is desirable to attach the side reinforcing member 7 to the footing side so that the entire construction space does not increase.

  As shown in FIG. 14, the side reinforcing member 7 is fixed to the connection portion 57 of the side long sheet pile 41 embedded inside the footing 21 in the vicinity of the ground surface of the soft ground 81, The upper end portion 7 a of the reinforcing member 7 is embedded inside the footing 21. The side reinforcing member 7 is 1/3 of the extension length L of the side long sheet pile 41 provided between the lower end portion 42a of the side short sheet pile 42 and the support ground 82 from the connection portion 57 of the side long sheet pile 41. It is attached to a predetermined depth range h up to a position where the depth is ½.

  The plurality of side reinforcing members 7 are fixed to each of the plurality of side long sheet piles 41. The plurality of side surface reinforcing members 7 are used by being attached from the connection portions 57 of the respective side long sheet piles 41 so that the rigidity and strength thereof are less than half that of the front and rear reinforcing members 6.

  The plurality of side surface reinforcing members 7 are not limited to this, and when a stiffener having the same shape, rigidity, strength, and the like as the front and rear reinforcing members 6 is used, the front and rear reinforcing members 6 are attached to the respective front and rear long sheet piles 31. On the other hand, the side reinforcing member 7 may be used by being arranged in one row with respect to the side long sheet pile 41 by two rows. In addition, as for the side surface reinforcement member 7, in order to prevent generation | occurrence | production of local buckling, it is desirable that the board width of a steel plate shall be less than 16 times the board thickness.

  As shown in FIG. 15, the side reinforcing member 7 is made of a perforated steel plate, a striped steel plate, or the like at a portion embedded inside the footing 21. At this time, as shown in FIG. 15 (a), the side reinforcing member 7 has a hole 63a penetrating the side reinforcing member surface attached to the side long sheet pile 41 in the direction perpendicular to the material axis, or FIG. 15 (b). As shown in FIG. 5, a concave portion 63b that is depressed on the side reinforcing member surface or a convex portion 63c that is raised on the side reinforcing member surface is formed.

  As shown in FIG. 16, the side short sheet piles 42 are connected in a state where the other side short sheet piles 42 or other side long sheet piles 41 adjacent to each other in the front-rear direction Z in the ground and the joints 54 are fitted to each other. Is done. The side short sheet pile 42 is embedded inside the footing 21 together with the side long sheet pile 41 in a state in which a diver 58 or the like is attached to the connection portion 57 embedded inside the footing 21. Alternatively, the side short sheet pile 42 is embedded in the footing 21 with the side reinforcing member 7 attached thereto in the same manner as the side long sheet pile 41. At this time, the length of the side reinforcing member 7 attached to the side short sheet pile 42 is equal to or shorter than the length of the side short sheet pile 42.

  The front and rear reinforcing members 6 and the side reinforcing members 7 are attached only to the front and rear long sheet piles 31 or the side long sheet piles 41 as shown in FIGS. The front and rear reinforcing members 6 and the side reinforcing members 7 are not limited thereto, and may be attached to the front and rear short sheet piles 32 or the side short sheet piles 42. At this time, the front / rear reinforcing member 6 and the side reinforcing member 7 extend from the connecting portion 57 of the front / rear short sheet pile 32 or the side short sheet pile 42 to the position where the lower end portion 32a of the front / rear short sheet pile 32 or the lower end portion 42a of the side short sheet pile 42 is located. Or it is attached to the front and back short sheet pile 32 or the side short sheet pile 42 within a predetermined range up to a position shallower than that.

  As shown in FIG. 17, the front / rear reinforcing member 6 and the side reinforcing member 7 have substantially the same cross-sectional shape as the front / rear long sheet pile 31 or the side long sheet pile 41 in the first modification. A U-shaped reinforcing steel sheet pile may be used. When the hat-shaped steel sheet pile 5 is used, the joint portion of the reinforcing steel sheet pile is cut so as not to interfere with the joint 54 of the longitudinal long sheet pile 31 or the side long sheet pile 41. In the first modification, the front and rear reinforcing members 6 and the side reinforcing members 7 cover the groove portions 50 of the hat-shaped steel sheet pile 5 or the U-shaped steel sheet pile 55 with respect to the front and rear long sheet pile 31 or the side long sheet pile 41. The arm 53 or the joint 54 is attached by welding or the like.

  As shown in FIG. 18, the front and rear reinforcing members 6 and the side reinforcing members 7 are substantially flat plate-like members that are installed on the pair of arms 53 or joints 54 of the front and rear long sheet piles 31 or the side long sheet piles 41 in the second modification. Steel plates may be used. In the second modification, the front and rear reinforcing members 6 and the side reinforcing members 7 cover the groove portions 50 of the hat-shaped steel sheet pile 5 or the U-shaped steel sheet pile 55 with respect to the front and rear long sheet pile 31 or the side long sheet pile 41. The arm 53 or the joint 54 is attached by welding or the like. In addition, the front-rear reinforcing member 6 and the side reinforcing member 7 can be formed with a hole 63a and the like as necessary.

  In the steel sheet pile foundation structure 1 to which the present invention is applied, as shown in FIG. 1, an external force is transmitted to the footing 21 that supports the bridge 23 or the like due to an earthquake, wind load, or the like acting in the width direction Z of the bridge 23 or the like. Thus, the horizontal load P acts on the front and rear sheet pile group 3 and the side sheet pile group 4 in the front and rear direction Z in the ground.

  As shown in FIGS. 1 and 19, the steel sheet pile foundation structure 1 to which the present invention is applied is such that the connecting portion 57 of the front and rear long sheet piles 31 of the front and rear sheet pile group 3 is fixed to the footing 21 and the front and rear long sheet piles 31. The tip processing portion 56 is fixed to the support ground 82. At this time, in the steel sheet pile foundation structure 1 to which the present invention is applied, the front and rear long sheet pile 31 is formed with the tip processed portion 56, and the upper and lower ends of the front and rear long sheet pile 31 are fixed. A horizontal load P acts in the longitudinal direction Z in the ground at the upper end of the sheet pile 31, and an excessive bending moment M acts on the longitudinal longitudinal sheet pile 31 in a predetermined range of the soft ground 81.

  As shown in FIGS. 1 and 20, the steel sheet pile foundation structure 1 to which the present invention is applied is such that the connection portion 57 of the side long sheet pile 41 of the side sheet pile group 4 is fixed to the footing 21 and the side long sheet pile 41. The tip processing portion 56 is fixed to the support ground 82. At this time, in the steel sheet pile foundation structure 1 to which the present invention is applied, the side long sheet pile 41 is formed with the distal end processed portion 56 so that the upper and lower ends of the side long sheet pile 41 are fixed. A horizontal load P acts in the longitudinal direction Z in the ground at the upper end of the sheet pile 41, and an excessive bending moment M acts on the side long sheet pile 41 within a predetermined range of the soft ground 81.

  In the steel sheet pile foundation structure 1 to which the present invention is applied, the upper and lower ends of the front and rear long sheet piles 31 and the side long sheet pile 41 are fixed to the footing 21 and the supporting ground 82. The bending moment M is concentrated on the surface side. For this reason, the steel sheet pile foundation structure 1 to which the present invention is applied has a long longitudinal direction in the weak axis direction of the cross section of the long longitudinal sheet pile 31 and the strong axial direction of the cross section of the lateral long sheet pile 41 with respect to the acting direction of the horizontal load P. The sheet pile 31 and the side long sheet pile 41 may be yielded and deformed. In this case, in general, the front and rear long sheet pile 31 and the side long sheet pile 31 and the side long sheet pile 41 are formed with the tip processed portion 56 to enhance the vertical support force. When the sheet pile 41 yields and deforms, there is a possibility that this vertical supporting force cannot be exhibited.

  In the steel sheet pile foundation structure 1 to which the present invention is applied, the upper and lower ends of the front and rear long sheet piles 31 and the side long sheet pile 41 are fixed, so that a bending moment M having a specific distribution is generated. The longitudinal longitudinal sheet pile 31 or the lateral elongated sheet pile 41 can resist a specific bending moment M acting on the soft ground 81 so that the predetermined longitudinal range h of the longitudinal longitudinal sheet pile 31 or the lateral elongated sheet pile 41 can be resisted. Further, the front / rear reinforcing member 6 or the side reinforcing member 7 is fixed and reinforced.

  Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied has the front and rear reinforcing members 6 against the specific bending moment M generated by the upper and lower ends of the front and rear long sheet piles 31 and the side long sheet pile 41 being fixed. And by adding the side reinforcement member 7 as a resistance member, it becomes possible to prevent the yield deformation of the front and rear long sheet piles 31 and the side long sheet piles 41. At this time, the steel sheet pile foundation structure 1 to which the present invention is applied prevents the front and rear long sheet pile 31 and the side long sheet pile 41 from yielding deformation, and the front and rear long sheet pile 31 and the side length formed with the tip processed portion 56. It becomes possible to fully exhibit the vertical support force of the shaku sheet pile 41.

  The steel sheet pile foundation structure 1 to which the present invention is applied includes the longitudinal longitudinal sheet pile 31 or the lateral long sheet pile 41 by fixing the longitudinal reinforcing member 6 or the lateral reinforcement member 7 to the longitudinal longitudinal sheet pile 31 or the lateral long sheet pile 41. Can be easily implemented. Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied does not require the steel sheet pile model to be pulled up or the use of high-strength steel, and can be easily and at low cost by the front and rear long sheet piles 31 or the side long sheet pile 41. Can be reinforced. Since the steel sheet pile foundation structure 1 to which the present invention is applied does not need to pull up the steel sheet pile model, the footing 21 can be reinforced with a compact steel sheet pile. In particular, when there is no more highly stiff steel sheet pile model, the existing steel sheet pile can also exert a reinforcing effect.

  The steel sheet pile foundation structure 1 to which the present invention is applied has a predetermined depth range h with an upper limit at a position that is 1/3 to 1/2 of the extended length L of the longitudinal longitudinal sheet pile 31 and the lateral elongated sheet pile 41. The front and rear reinforcing members 6 and the side reinforcing members 7 are attached to the front. The longitudinal long sheet pile 31 or the lateral long sheet pile 41 has a bending moment M that is predominant in the soft ground 81 with an N value of 20 or less, from the connecting portion 57 to a position that is ½ of the extension length L. It will act. However, since the bending moment generated near 1/3 depth of the extension length L is small and the effect of increasing the rigidity due to the attachment of the reinforcing member is small, the generation depth of the maximum bending moment along the long sheet pile material axial direction is When the depth is less than 1/3 depth of the extension length L and shallower than the lower end of the short sheet pile, 1/3 of the extension length L may be set as the upper limit as the length of the reinforcing member. At this time, since the total weight of the stiffening member can be reduced, a more economical reinforcement method can be realized. The front and rear long sheet pile 31 or the side long sheet pile 41 is in the depth range h from the connecting portion 57 to a position where the depth is ½ of the extension length L, in the vicinity of the ground surface of the soft ground 81 and Even if the side reinforcing member 7 is attached, it does not affect the placement in the support layer or in the vicinity of the support layer, so that a significant increase in the placement resistance on the soft ground 81 can be avoided.

  Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied has a depth of 1/2 of the extended length L of the front and rear long sheet piles 31 and the side long sheet piles 41, particularly in the soft ground 81 having an N value of 20 or less. By attaching the front and rear reinforcing members 6 and the side reinforcing members 7 to the upper limit, the front and rear reinforcing members 6 can be used only in the depth range h in which the bending moment M acts predominantly while avoiding a significant increase in driving resistance. And it becomes possible to reinforce efficiently by the side reinforcement member 7. In addition, the steel sheet pile foundation structure 1 to which the present invention is applied includes the front and rear reinforcing members 6 and the side reinforcing members with the upper limit being a position that is 1/3 of the extended length L of the front and rear long sheet piles 31 and 41. If 7 is attached, the remarkable raise of the placing resistance of the longitudinal long sheet pile 31 and the side long sheet pile 41 can be avoided more effectively.

  In the steel sheet pile foundation structure 1 to which the present invention is applied, the horizontal load P acts on the bridge pier 22 supported by the footing 21 and rotational deformation occurs in the footing 21 as shown in FIG. The bending moment concentrates on the ground side close to 21, and a bending moment M having a specific distribution is generated.

  The steel sheet pile foundation structure 1 to which the present invention is applied has a rigidity or strength less than half that of the front / rear reinforcing member 6 or has the same specifications as the front / rear reinforcing member 6 in shape, rigidity, strength, etc. When the stiffener is used, the front and rear reinforcing members 6 are arranged in two rows for each of the front and rear long sheet piles 31 and the side reinforcing members 7 are arranged in one row for the side long sheet piles 41, so that it is more than necessary. Therefore, it is not necessary to increase the rigidity. Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied uses the side reinforcing member 7 in consideration of the direction of the bending moment M with respect to the cross-sectional strong axis direction of the side long sheet pile 41, thereby Yield deformation can be efficiently prevented, and the side long sheet pile 41 can be reinforced at low cost.

  As shown in FIGS. 5 and 11, the steel sheet pile foundation structure 1 to which the present invention is applied is arranged such that the front and rear reinforcing members 6 are disposed inside the groove portions 50, and the side reinforcing member 7 is the wall inner side A of the side sheet pile group 4. Fixed in place. Thereby, the steel sheet pile foundation structure 1 to which this invention is applied does not increase the wall thickness of the front and rear sheet pile group 3 and the side sheet pile group 4, and the front and rear long sheet pile 31 and the side long sheet pile 41 are replaced by the front and rear reinforcing members 6 and It becomes possible to reinforce with the side reinforcing member 7.

  As shown in FIGS. 5 and 10, the steel sheet pile foundation structure 1 to which the present invention is applied has a water jet pipe 59 attached to the front and rear long sheet piles 31 and the side long sheet pile 41. Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied directly uses the water jet pipe 59 used when standing up to the support ground 82 or the vicinity of the support ground 82, and uses the longitudinal sheet pile 31 and the side length. It becomes possible to reinforce the shaver board 41.

  As shown in FIGS. 7 and 15, the steel sheet pile foundation structure 1 to which the present invention is applied has a hole 63 a, a recess 63 b, or a protrusion on the upper end 6 a of the front / rear reinforcing member 6 and the upper end 7 a of the side reinforcing member 7. 63c is formed. Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied has an adhesion strength with the footing 21 in a state where the upper end portion 6a of the front and rear reinforcing member 6 and the upper end portion 7a of the side reinforcing member 7 are embedded inside the footing 21. Can be reliably improved. In the steel sheet pile foundation structure 1 to which the present invention is applied, the front / rear reinforcing member 6 and the side reinforcing member 7 can also function as a gibber for coupling to the footing 21, so A member can be made unnecessary.

  As shown in FIGS. 11 to 13, the steel sheet pile foundation structure 1 to which the present invention is applied is spaced apart from the strong axis neutral axis N of the cross section of the side long sheet pile 41 and substantially parallel to the strong axis neutral axis N. The side reinforcing member 7 is fixed so that Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied increases the sectional moment of the side long sheet pile 41 with respect to the strong axis direction neutral axis N while facilitating the welding work and the strength design of the side reinforcing member 7. Thus, the resistance against the horizontal load P can be improved.

  As shown in FIG. 17, the steel sheet pile foundation structure 1 to which the present invention is applied has the same cross-sectional shape as the longitudinal longitudinal sheet pile 31 or the lateral elongated sheet pile 41 in the first modified example of the longitudinal reinforcing member 6 and the lateral reinforcing member 7. The steel sheet pile for reinforcement made substantially the same is used. Thereby, the steel sheet pile foundation structure 1 to which the present invention is applied only needs to prepare a reinforcing steel sheet pile of the same type as the front and rear long sheet pile 31 or the side long sheet pile 41, and the front and rear long sheet pile efficiently and at low cost. 31 or the side long sheet pile 41 can be reinforced.

  As shown in FIG. 18, the steel sheet pile foundation structure 1 to which the present invention is applied is a pair of arms of the longitudinal long sheet pile 31 or the lateral long sheet pile 41 in the second modification of the longitudinal reinforcing member 6 and the lateral reinforcing member 7. 53 or a substantially flat steel plate installed on the joint 54 is used. Thereby, especially the steel sheet pile foundation structure 1 to which this invention is applied does not reduce the diameter of the groove part 50 of the side long sheet pile 41 with respect to the horizontal load P which acts on the strong axis direction of the cross section of the side long sheet pile 41. As described above, the side reinforcing member 7 can hold the gap, and it is possible to prevent a decrease in rigidity due to the reduced diameter of the groove portion 50 of the side long sheet pile 41.

  As shown in FIGS. 19 and 20, the steel sheet pile foundation structure 1 to which the present invention is applied includes a front and rear reinforcing member 6 and a side reinforcing member 7 having a lower end portion 32 a of a front and rear short sheet pile 32 and a lower end portion 42 a of a side short sheet pile 42. It extends toward the lower side and is attached to the front and rear long sheet pile 31 and the side long sheet pile 41. As a result, the steel sheet pile foundation structure 1 to which the present invention is applied stresses the front and rear long sheet piles 31 and the side long sheet pile 41 at the positions where the lower end part 32a of the front and rear short sheet piles 32 and the lower end part 42a of the side short sheet piles 42 are provided. It becomes possible to avoid concentrating.

  The steel sheet pile foundation structure 1 to which the present invention is applied is not limited to this, and the positions where the front and rear reinforcing members 6 and the side reinforcing members 7 become the lower end portion 32 a of the front and rear short sheet pile 32 and the lower end portion 42 a of the side short sheet pile 42 are provided. The front and rear long sheet piles 31 and the side long sheet piles 41 may be attached. Moreover, the steel sheet pile foundation structure 1 to which the present invention is applied changes with respect to the front and rear long sheet pile 31 and the side long sheet pile 41 as the depth from the bottom surface of the footing according to the average N value of the surface layer ground and the sheet pile model. The front and rear reinforcing members 6 and the side reinforcing members 7 may be attached up to a position that is 1 / β. 1 / β is calculated by a characteristic value β that satisfies the relationship defined by the following equations (1) to (4).

ここで、ｋ_H：水平方向地盤反力係数（ｋＮ／ｍ³）、Ｄ：荷重作用方向に直交する鋼矢板基礎の載荷幅（ｍ）、ＥＩ：鋼矢板基礎の曲げ剛性（ｋＮ／ｍ²）、B_H：荷重作用方向に直交する基礎の換算載荷幅（ｍ）、α＝２、Ｎ：表層地盤の平均Ｎ値とする。

Here, k _H : horizontal ground reaction force coefficient (kN / m ³ ), D: loading width (m) of steel sheet pile foundation orthogonal to load acting direction, EI: bending stiffness of steel sheet pile foundation (kN / m ²⁾ ), B _H : Conversion load width (m) of foundation orthogonal to load acting direction, α = 2, N: Average N value of surface ground.

  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: Steel sheet pile foundation structure 21: Footing 21a: Front surface 21b: Rear surface 21c: Left side surface 21d: Right side surface 22: Bridge pier 23: Bridge 24: Chuck part 3: Front / rear sheet pile group 31: Front / rear long sheet pile 31a: Front end (front / rear) Long sheet pile)
32: Front and rear short sheet piles 32a: Lower end (front and rear short sheet piles)
4: Side sheet pile group 41: Side long sheet pile 41a: Tip part (side long sheet pile)
42: Side short sheet pile 42a: Lower end (side long sheet pile)
5: Hat-shaped steel sheet pile 50: Groove portion 51: Flange 52: Web 53: Arm 54: Joint 55: U-shaped steel sheet pile 56: Tip processed portion 57: Connection portion 58: Giber 59: Water jet pipe 6: Front / rear reinforcing member 61 : One end flange portion 62: other end flange portion 63: web portion 63a: hole portion 63b: concave portion 63c: convex portion 6a: upper end portion (front and rear reinforcing member)
7: Side reinforcing member 7a: Upper end (side reinforcing member)
71: One end 72: The other end 81: Soft ground 82: Support ground X: Left-right direction Y: Height direction Z: Front-back direction

Claims (12)

A steel sheet pile foundation structure in which a plurality of steel sheet piles are provided downward from the footing,
A front and rear sheet pile group provided downward from the front and rear faces of the footing, and a side sheet pile group provided downward from both side faces of the footing,
The front and rear sheet pile group is provided by arranging a front and rear long sheet pile to be erected to the support ground with the front and rear reinforcing members attached, and a front and rear short sheet pile to be erected to the soft ground,
The side sheet pile group is provided with a side long sheet pile that is erected up to the support ground with a side reinforcing member attached, and a side short sheet pile that is erected up to the soft ground.
The front and rear long sheet piles are provided between the lower end part of the front and rear short sheet piles and the support ground from the connection part embedded inside the footing while the tip processed part is formed at the tip part embedded in the support ground. In the depth range up to a position where the depth is ½ or less of the extension length, the front and rear reinforcing members are arranged in the material axis direction of the front and rear long sheet piles so as to resist the bending moment acting on the soft ground. Steel sheet pile foundation structure characterized by being fixed. The side long sheet pile is provided between a lower end portion of the side short sheet pile and the support ground from a connecting portion embedded inside the footing while a tip processing portion is formed at a tip portion embedded in the support ground. In order to resist bending moment acting on the soft ground in a depth range up to a position where the depth is 1/2 or less of the extension length, the side reinforcing member is arranged in the direction of the material axis of the side long sheet pile. Is fixed,
The plurality of side reinforcing members are fixed to each of the plurality of side long sheet piles, and have a rigidity and strength less than half that of the front and rear reinforcing members, or the same specifications as the front and rear reinforcing members When the stiffeners are used, the front and rear reinforcing members are arranged in two rows for each of the front and rear long sheet piles, and the side reinforcing members are arranged in one row for the side long sheet piles. The steel sheet pile foundation structure according to claim 1. The front-rear reinforcing member is an H-shaped member that has a substantially H-shaped cross section and extends in the material axis direction of the front-rear long sheet pile, and a flange portion at one end of the H-shaped member abuts the front-rear long sheet pile. The steel sheet pile foundation structure according to claim 1 or 2, wherein: The front and rear long sheet piles use a hat-shaped steel sheet pile or U-shaped steel sheet pile in which a groove is formed by a web and a pair of flanges, and the flange at the other end of the H-shaped member is on the inner side or the footing side of the groove. The steel sheet pile foundation structure according to claim 3, wherein the front and rear reinforcing members are fixed to the front and rear long sheet piles so as to be arranged in a vertical direction. In the side reinforcing member, a pair of steel plates extending in the direction of the material axis of the side long sheet pile are used on both sides of the side long sheet pile, and one end of each steel plate contacts the side long sheet pile. The steel sheet pile foundation structure according to claim 1, wherein the steel sheet pile foundation structure is in contact with each other. The side reinforcing member is spaced apart from the strong axis neutral axis of the sheet pile cross section of the side long sheet pile, and is substantially parallel to the strong axis neutral axis of the sheet cross section of the side long sheet pile. The steel sheet pile foundation structure according to claim 5, wherein the steel sheet pile foundation structure is fixed to both sides of the sheet pile. The side long sheet pile is made of a hat-shaped steel sheet pile or U-shaped steel sheet pile in which a groove is formed by a web and a pair of flanges, and the other end of each steel plate is arranged inside the groove or on the footing side. The steel sheet pile foundation structure according to claim 5 or 6, wherein the side reinforcing member is fixed to the side long sheet pile. The steel sheet pile foundation structure according to claim 1 or 2, wherein the front / rear reinforcing member and the side reinforcing member have substantially the same cross-sectional shape as the front / rear long sheet pile or the side long sheet pile. . The front and rear long sheet piles and the side long sheet piles are made of hat-shaped steel sheet piles or U-shaped steel sheet piles in which grooves are formed by a web and a pair of flanges, and steel plates are installed so as to close the grooves. The steel sheet pile foundation structure according to claim 1 or 2, wherein the front and rear reinforcing members are fixed to the front and rear long sheet piles or the side reinforcing members are fixed to the side long sheet piles. The front and rear reinforcing members and the side reinforcing members are upper ends embedded inside the footing together with the front and rear long sheet piles and the side long sheet piles, and in the direction perpendicular to the material axes of the front and rear long sheet piles and the side long sheet piles. The steel sheet pile foundation structure according to any one of claims 1 to 9, wherein a through-hole, a recess recessed in the direction perpendicular to the material axis, or a projection raised in the direction orthogonal to the material axis is formed. . The front and rear long sheet piles and the side long sheet piles are reinforced using a water jet pipe used when the front and rear long sheet piles and the side long sheet piles are erected to a supporting ground. The steel sheet pile foundation structure according to any one of Items 1 to 10. The steel sheet pile foundation according to any one of claims 1 to 11, wherein the front / rear reinforcing member or the side reinforcing member is attached to either one or both of the front / rear short sheet pile and the side short sheet pile. Construction.

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