JP6232830B2 - Deformation restraining jig when placing steel sheet piles - Google Patents

Description

  In the field of civil engineering and construction, when steel sheet piles are sequentially placed in order to form a continuous steel sheet pile wall structure, deformation due to earth pressure at the corners of the steel sheet piles is suppressed, and the verticality and straight travel of the steel sheet piles are suppressed. The present invention relates to a deformation restraining jig that secures safety.

  In the field of civil engineering and construction, U-shaped, Z-shaped, straight-shaped, and hat-shaped steel sheet piles, and steel sheet piles in combination with steel sheet piles and shaped steel, are used for earth retaining walls and underground structures. Widely used for walls, riverwalls and harbor revetments, retaining walls for road construction. Steel sheet piles are high in rigidity, but may be deformed by being placed on hard ground or repeatedly used.

  In FIG. 1, the deformation | transformation aspect in the ground of a steel sheet pile is shown. FIG. 1 (a) shows an action mode of earth pressure acting on a steel sheet pile, and FIG. 1 (b) shows a mode of the steel sheet pile before and after deformation. When the steel sheet pile is driven, the closed region 2 is formed in the concave portion of the steel sheet pile, and a horizontal earth pressure P higher than the horizontal earth pressure of the surrounding ground is generated in this region and acts on the concave portion.

  The horizontal earth pressure P becomes a deformation factor of the steel sheet pile at the time of placing, and as shown in FIG. 1 (b), the corner portion 1c of the steel sheet pile 1 expands as the placement depth increases (in the figure, it has expanded). Along with the corner portion 1c ′, the deformation widths W1 and W2 of the lower end portion of the steel sheet pile 1 are expanded, and the full width of the steel sheet pile 1 (interval between the joints 1d) is also expanded.

  Usually, one of the following cast steel sheet piles is fitted into the joint of the preceding cast steel sheet pile, but if the displacement of the joint of the preceding cast steel sheet pile is large, the preceding cast steel sheet pile and the rear It becomes difficult to fit the joints of the cast steel sheet piles, and during the placement, the joints are stuck and the steel sheet piles are stopped at a high height. In addition, when steel sheet piles are used repeatedly, if deformation is accumulated in the steel sheet piles, correction work is required after drawing, and if the residual deformation is large, the number of uses of the steel sheet piles is reduced.

  FIG. 2 shows one means for accurately driving the steel sheet pile (see Non-Patent Document 1). In the driving means shown in FIG. 2, in order to ensure the correct driving position of the steel sheet pile 1 and the stability at the time of construction, two rows parallel to the normal line of the steel sheet pile wall 1 'are provided on the surface of the ground 5. The guide frame 4 is driven in, and the guide beam 3 is attached to the inside thereof.

  However, although the driving means shown in FIG. 2 can ensure the accuracy (verticality and straightness) of the placement position of the steel sheet pile 1 on the surface of the ground 5 by the arrangement of the two rows of guide piles 4, the ground 5 The warp or bending of the steel sheet pile 1 that occurs inside cannot be suppressed.

  FIG. 3 shows a steel material for underground continuous wall in which H-shaped steel is attached to the outside of the flange of the U-shaped steel sheet pile in order to increase the cross-sectional rigidity of the steel sheet pile itself (see Patent Document 1). In the steel material for underground continuous walls shown in FIG. 3, since the H-section steel 6 is fixed to the flange of the steel sheet pile 1z, there is a deformation suppressing effect in the direction perpendicular to the wall of the steel sheet pile wall, but the corner portion 1c. It does not suppress deformation against the expansion of the corners.

  FIG. 4 shows an underground wall structure composed of a steel sheet pile with attached stiffening members (see Patent Document 2). FIG. 4 (a) shows a cross section of a steel sheet pile with a stiffening member attached, and FIG. 4 (b) shows an embodiment of the underground wall structure.

  The steel sheet pile wall 1 'is connected to the column 7 in the steel sheet pile (see FIG. 4 (a)) with the stiffening member 8 attached to the maximum opening portion of the recess of the steel sheet pile 1 (FIG. 4 (b), reference). The presence of the stiffening member 8 suppresses buckling of the steel sheet pile 1 and improves the shear strength in the wall direction (in-plane direction) of the steel sheet pile wall.

  In the steel sheet pile 1 shown to Fig.4 (a), since the substantially full width of the steel sheet pile 1 is being fixed by the stiffening member 8, the effect which suppresses a deformation | transformation of a steel sheet pile expresses, but the stiffening member 8 and steel Since the closed region 2 is formed by the sheet pile 1, the placement resistance is increased by the increase in vertical earth pressure due to the closed state.

  In particular, when the stiffening member 8 is arranged at the lower end portion of the steel sheet pile 1, the horizontal earth pressure that causes the steel sheet pile to be deformed by closing the tip is remarkably increased, and the steel sheet pile warps greatly, and the joint is fitted. The occurrence of crest increases the driving resistance (= force required for driving) and impairs the workability of the steel sheet pile.

  FIG. 5 shows a hat-shaped steel sheet pile provided with stacking interval holding portions (see Patent Document 3). Thick stacking interval holding portions 1y ′ are provided at the corner portions 1c of the hat-shaped steel sheet pile 1y. When the stacking interval holding portion 1y ′ is provided, since the web and the joint do not come into contact with each other when the steel sheet piles are stacked, deformation during storage of the steel sheet piles can be prevented.

  Since steel sheet piles are not deformed during storage, steel sheet piles without deformation will be cast at the time of placing, ensuring the verticality and straightness of steel sheet piles in the ground at the beginning and during placement. it can. However, in the rolling process, it is necessary to form the same thickness over the entire length of the corner portion, and the manufacturing cost of the steel sheet pile increases.

  In the manufacturing process, it is not possible to partially thicken only the necessary position or change the thickness in the axial direction. The hat-shaped steel sheet pile shown in FIG. 5 is not a commercial product and is a custom-made product, so the price is high.

  FIG. 6 shows a tip protection jig that protects the tip of the steel sheet pile (see Non-Patent Document 2). When the steel sheet pile is driven into the hard ground, the tip protection jig 9 is attached to the tip of the steel sheet pile to suppress the deformation of the tip of the steel sheet pile. In addition, in order to reduce the resistance at the time of placing, the front-end | tip of a front-end | tip protection jig is formed with the cut 9a.

  However, the tip protection jig shown in FIG. 6 only suppresses deformation of only the tip portion of the steel sheet pile, and has no effect on suppressing deformation of the entire steel sheet pile.

Japanese Patent No. 3603793 JP 2012-017556 A JP 2012-140863 A

“From steel sheet pile design to construction” (Pipe pile association, 2007) “Skyline steel Technical Product Manual” (Skyline steel, 2012)

  In view of the problems of the prior art related to the prevention of deformation of steel sheet piles, the present invention has an object to suppress the deformation of steel sheet piles that occurs in the ground during placement, solves the problem, and further facilitates processing. Therefore, an object of the present invention is to provide a deformation restraining jig that is easy to work on site and does not impair the workability of the steel sheet pile.

  The present inventors analyzed a deformation mechanism at the time of placing a steel sheet pile in order to examine a method for solving the above-described problem. As a result, due to the large horizontal earth pressure acting on the closed area formed in the steel sheet pile recess during placement, the corner of the steel sheet pile expands, and accordingly, the position of the joint of the steel sheet pile is displaced, It has been found that the full width of is expanded.

  This invention was made | formed based on the said knowledge, and the summary is as follows.

(1) A plate-like member mounted on a corner portion formed by a web and a flange of a steel sheet pile or a web and an arm,
The plate-like member comprises a plate surface that matches the inner surface or outer surface of the corner portion of the steel sheet pile,
The half width of the plate-like member is at least 2.2 times the steel sheet pile flange plate thickness,
The inner surface of the corner portion, the outer surface, or on both sides, hitting設時deformation inhibiting jig steel sheet pile, characterized in that mounted in the axial direction of the steel sheet pile.

(2) Placing the steel sheet pile according to (1) above, wherein the plate-like member is mounted continuously or intermittently over the entire length of the steel sheet pile along the axial direction of the steel sheet pile. Deformation suppression jig.

(3) Attaching the plate-like member continuously or intermittently within the range of less than ½ of the penetration depth below the ground surface from the lower end of the steel sheet pile along the axial direction of the steel sheet pile. The deformation suppression jig at the time of placing the steel sheet pile according to the above (1).

(4) The steel sheet pile deformation restraining jig according to any one of (1) to (3), wherein a notch is formed at a lowermost end of the plate-like member.

( 5 ) The steel sheet pile deformation restraining jig according to any one of (1) to ( 4 ), wherein the plate member is mounted by welding, a bolt, or an adhesive. .

  According to the present invention, when the steel sheet piles are stacked, the interval between the steel sheet piles can be maintained, so that deformation due to stacking can be prevented, and when the steel sheet piles are placed, expansion of the corners of the steel sheet piles is suppressed. The deformation of the entire steel sheet pile in the ground can be suppressed.

  Further, according to the present invention, on-site processing is possible, and in particular, when a steel sheet pile having a thin plate thickness is used repeatedly, the trouble of correction after drawing is saved, and the number of times of repeated use increases.

It is a figure which shows the deformation | transformation aspect in the ground of a steel sheet pile. (A) shows the action mode of earth pressure acting on a steel sheet pile, and (b) shows the mode of the steel sheet pile before and after deformation. It is a figure which shows one means which aims at exact placement of a steel sheet pile (refer nonpatent literature 1). It is a figure which shows the steel material for underground continuous walls which attached the H-section steel to the outer side of the flange of a U-shaped steel sheet pile (refer patent document 1). It is a figure which shows the underground wall structure comprised with the steel sheet pile to which the stiffening material was attached (refer patent document 2). (A) shows the cross section of the steel sheet pile to which the stiffener was attached, (b) shows the aspect of an underground wall structure. It is a figure which shows the aspect of the hat-shaped steel sheet pile provided with the space | interval holding | maintenance part for stacking (refer patent document 3). It is a figure which shows the front-end | tip protection jig which protects the front-end | tip of a steel sheet pile (refer nonpatent literature 2). It is a figure which shows the one aspect | mode which mounted | wore the hat-shaped steel sheet pile with the deformation | transformation suppression jig | tool. It is a figure which shows the obstruction | occlusion area | region formed at the time of placement of a steel sheet pile. It is a figure which shows the mounting position of the deformation | transformation suppression jig | tool which raises the out-of-plane bending rigidity of a steel sheet pile. It is a figure which shows the mounting aspect of a deformation | transformation suppression jig | tool in case there exists a restriction | limiting in the thickness of a steel sheet pile wall. It is a figure which shows the various mounting aspects of a deformation | transformation suppression jig | tool. (A) shows a mode in which two deformation suppression jigs are mounted on one corner, and (b) shows various mounting modes in the case of mounting one deformation suppression jig on one corner. (C) shows the mounting mode of the deformation preventing jig when the H-shaped steel is connected to the steel sheet pile. It is a figure which shows the mounting | wearing aspect of the deformation | transformation suppression jig in the case where the steel sheet pile wall is comprised by driving in order the steel sheet pile with high rigidity which connected H-section steel. It is a figure which shows the attachment to the corner part of a deformation | transformation suppression jig | tool, and the joint clearance in a fitting joint. (A) shows attachment to the corner part of a deformation | transformation suppression jig | tool, (b) shows the joint clearance in a fitting joint. It is a figure which shows the result of having investigated the correlation of the placement depth of a steel sheet pile, and the displacement amount of a coupling. It is a figure which shows the various mounting aspects in mounting | wearing with the deformation | transformation suppression jig | tool of the axial direction of a steel sheet pile. (A) shows the aspect which attached the deformation | transformation suppression jig | tool continuously over the full length in the axial direction of a steel sheet pile, (b) shows the deformation | transformation suppression treatment intermittently over the full length in the axial direction of a steel sheet pile. (C) shows the aspect which mounted | worn the deformation | transformation suppression jig | tool continuously in the required range of the lower part in the axial direction of a steel sheet pile, (d) shows the axis | shaft of a steel sheet pile. In the direction, a mode in which a deformation restraining jig is intermittently mounted in a required range in the lower part is shown. It is a figure which shows the cross section of the deformation | transformation suppression jig | tool which cut into the lowest end. It is a figure which shows the mounting aspect which mounted | worn with the round steel instead of the deformation | transformation prevention jig | tool with which it mounts inside. It is a figure which shows the deformation | transformation suppression jig | tool of various shapes. (A)-(c) shows the aspect which mounted the plate-shaped deformation | transformation suppression jig to one or both of a flange and a web by overlay welding, (d) is the shape inside a corner part. The aspect which attached the deformation | transformation prevention jig | tool of the polygonal cross section provided with the matching shape to the inner side of a corner part by welding is shown, (e) is the aspect which attached the deformation | transformation suppression jig | tool of the mountain shaped cross section to the flange and the web by welding. (F) shows a mode in which two plate-shaped deformation prevention jigs are arranged so as to match the outer shape of the corner portion and are mounted by overlay welding.

  As described above, when placing the steel sheet pile, the horizontal earth pressure acting on the closed region formed in the steel sheet pile recess expands the corner of the steel sheet pile, and accordingly, the position of the joint of the steel sheet pile is displaced. The full width of the steel sheet pile is also expanded.

The steel sheet pile deformation restraining jig of the present invention (hereinafter sometimes referred to as “the present invention jig”) is provided with a deformation restraining jig attached to the corner portion of the steel sheet pile to expand the corner portion. the arresting as to the basic idea, specifically, "the steel sheet pile web and flange, or a plate-like member to be attached to corner portions formed by the web and the arm, said plate The member includes a plate surface that matches the inner surface or outer surface of the corner portion of the steel sheet pile, and the half width of the plate-like member is 2.2 times or more of the steel sheet pile flange plate thickness, and the inner surface of the corner portion, It is mounted on the outer surface or both surfaces along the axial direction of the steel sheet pile ”.

  Here, the member attached to the corner formed by the web and the flange of the steel sheet pile or the web and the arm is a plate-shaped member, a polygonal member, a shaped steel, a round steel, and a steel bar.

  Hereinafter, the jig of the present invention will be described with reference to the drawings.

  In FIG. 7, the one aspect | mode which mounted | wore the hat-shaped steel sheet pile with the deformation | transformation suppression jig | tool is shown. In the hat-shaped steel sheet pile 1y, the deformation restraining jig 10a is mounted on the front side (convex side) of the two corner portions 1c that connect the flange 1e and the web 1f, and the web 1f and the arm of the joint 1d are connected to the end portion. A deformation restraining jig 10b is mounted on the back side (concave side) of the two corner portions 1c connecting 1g.

  As shown in FIG. 7, the deformation restraining jig 10a is a plate-like member having a plate surface that matches the front side (convex side) surface of the corner 1c formed by the flange 1e and the web 1f. The deformation suppression jig 10b is a plate-like member having a plate surface that matches the back side (concave side) surface of the corner portion 1c formed by the web 1f and the arm 1g.

  In the steel sheet pile 1y, the corner portion 1c tends to expand due to the horizontal earth pressure P generated in the closed region 2. In order to suppress this, as shown in FIG. 7, at the corner 1c formed by the web 1f and the flange 1e, the deformation restraining jig 10a is mounted on the front side (convex side) of the hat-type steel sheet pile 1y, At the corner 1c formed by the web 1f and the arm 1g, the deformation restraining jig 10b is mounted on the back side (concave side) of the hat-type steel sheet pile 1y.

  By attaching a deformation suppression jig to the corner portion of the steel sheet pile, it is possible to suppress the expansion of the corner portion. The reason is considered as follows.

  FIG. 8 shows a closed region formed when a steel sheet pile is placed. At the time of placing, a closed region 2a is formed in an inner region 1c ″ (region of less than 180 degrees on the back side (concave side)) of the corner portion 1c formed by the flange 1e and the web 1f, and the arm 1g and the web 1f are formed. The closed region 2b is formed in the inner region 1c '' (region of less than 180 degrees on the front side (convex side)) of the corner portion 1c formed by the above, and high vertical earth pressure is generated in the closed region 2a and the closed region 2b. Occur.

  If the deformation restraining jig attached to the corner portion is present in the closed region, the deformation restraining jig receives a resistance of high vertical earth pressure at the time of placing, so that a load necessary for placing increases. Therefore, when the ground is hard, the deformation restraining jig is preferably attached to the corner in the region opposite to the closed region, but may be attached to the corner in the closed region as will be described later. .

  In FIG. 9, the mounting position of the deformation | transformation suppression jig | tool which raises the out-of-plane bending rigidity of a steel sheet pile is shown. In the mounting position of the deformation restraining jig shown in FIG. 9, the deformation restraining jig 10a and the deformation restraining jig 10b are mounted at the corners in a region opposite to the closed region. The deformation restraining jig 10a 'is attached to the corner portion in the closed region. When the ground is not so hard, even in the closed region, a deformation suppression jig is attached to the corner portion to effectively suppress the deformation of the steel sheet pile.

  When the deformation restraining jig is mounted at a position away from the neutral axis of the steel sheet pile alone, the rigidity of the steel sheet pile against bending in the out-of-plane direction increases. That is, since d1> d2 at the mounting position of the deformation restraining jig shown in FIG. 9, the deformation restraining jig 10a increases the rigidity of the steel sheet pile against bending in the out-of-plane direction than the deformation restraining jig 10a ′. A big contribution.

  The deformation restraining jig is attached to the corner by welding, bolting, or an adhesive. As the adhesive, an adhesive having a strong adhesive force is selected, but it is better to avoid the steel sheet pile on a hard ground.

  In this respect, the bolt joint can be used even when a steel sheet pile is placed on a hard ground if the number of bolts, the diameter, and the strength are appropriately selected, and can be attached after carrying in the field. In addition, in the case of bolt joining, it becomes possible to reuse the deformation restraining jig.

  Usually, welding is used for mounting the corners of the deformation restraining jig from the viewpoint of securing the mounting strength and the ease of mounting work. In the case of welding, all-around welding is performed, and turning welding is applied to the lower end portion of the steel sheet pile so as not to be peeled off due to resistance at the time of placing.

  In particular, in a steel sheet pile combined with a hat-shaped steel sheet pile or H-shaped steel, the steel sheet pile tends to deform to the front side (convex side) due to the horizontal earth pressure generated in the closed region (see FIG. 7). A deformation suppression jig is mounted on the outside of the corner, but if the mounting is performed by welding, the welding throat thickness required for the deformation suppression jig itself to resist deformation can be reduced.

  However, depending on the shape of the steel sheet pile, it may be deformed to the back side (concave side). Therefore, when deformation to the back side (concave side) is predicted, a deformation restraining jig is placed inside the corner. It is better to wear.

  FIG. 10 shows how the deformation restraining jig is mounted when the thickness of the steel sheet pile wall is limited. When the thickness of the steel sheet pile wall is limited, as shown in FIG. 10, the deformation suppression jig 10a and the deformation suppression are performed so that the height of the steel sheet pile does not exceed the limit of the thickness of the steel sheet pile wall. The jig 10b is mounted on the inner surface of the corner portion 1c. When the deformation restraining jig is attached to the inner surface of the corner portion, the steel sheet pile wall can be configured without changing the height of the steel sheet pile, so that the thickness of the steel sheet pile wall can be within the limit.

  When it can be predicted that the deformation of the steel sheet pile will increase from the ground conditions, the deformation suppressing jig is mounted not only on one side of the corner part but also on both sides of the corner part.

  FIG. 11 shows various mounting modes of the deformation restraining jig. FIG. 11A shows a mode in which two deformation restraining jigs are attached to one corner, and FIG. 11B shows a case in which one deformation restraining jig is attached to one corner. Various mounting modes are shown, and FIG. 11 (c) shows a mounting mode of the deformation preventing jig when the H-shaped steel is connected to the steel sheet pile.

  When a steel sheet pile wall is constructed by sequentially placing high-stiffness steel sheet piles connected with H-shaped steel, the fitting joint suppresses deformation in the half width direction of the steel sheet pile on the fitting joint side. Deformation in which the corner on the side opposite to the fitting joint expands becomes the main deformation of the steel sheet pile.

  FIG. 12 shows how the deformation restraining jig is mounted when a steel sheet pile wall is constructed by sequentially placing high-stiffness steel sheet piles connected to H-shaped steel.

When the steel sheet pile wall is constructed by sequentially placing high-stiffness steel sheet piles 1 connected to the flange 1e of the steel sheet pile 1, the H-shaped steel suppresses deformation of the flange 1e of the steel sheet pile 1 by the H-shaped steel. Since the deformation in the width direction of the left half of the drawing of the steel sheet pile 1 is suppressed by the fitting joint 1d ′, the deformation in which the corner portion of the right shoulder expands is the main component of the deformation of the steel sheet pile as described above. Become.

  Therefore, in this case, the deformation restraining jig 10a may be attached only to the corner on the opposite side to the fitting joint 1d ′. If the deformation restraining jig is attached only to one corner portion and the deformation of the steel sheet pile can be restrained, the material cost and the work cost can be reduced.

  The width of the deformation restraining jig is important in maximizing the deformation restraining effect of the deformation restraining jig attached to the corner portion of the steel sheet pile. In order to improve the workability when forming the wall body, the expansion of the corner is suppressed with a deformation restraining jig, and the joint displacement of the preceding sheet pile fitting with the joint of the trailing sheet pile is within the range of the joint clearance. It is necessary to fit within. For that purpose, it is necessary to secure a required width in the deformation restraining jig.

  FIG. 13 shows the mounting of the deformation restraining jig on the corner and the joint clearance in the fitting joint. FIG. 13A shows the mounting of the deformation restraining jig to the corner, and FIG. 13B shows the joint clearance in the fitting joint.

  As shown in FIG. 13 (a), a deformation inhibiting jig 10a having a half width L (L: half width of one side of a plate-like member constituting the deformation inhibiting jig) is attached to the corner, and FIG. As shown in FIG. 5, the displacement of the joint 1d is suppressed within the range of the joint clearance D in the fitting joint 1d ′.

  The inventors investigated the width of the deformation restraining jig that can restrain the displacement of the joint 1d within the range of the joint clearance D in the fitting joint 1d '. The half width L of the deformation restraining jig is set to 2.2 · t 1 and 6.1 · t 1 (t 1: the thickness of the flange of the steel sheet pile) in relation to the thickness t of the flange of the steel sheet pile. The correlation between sheet pile placement depth and joint displacement was investigated. The results are shown in FIG.

  As shown in FIG. 14, the deformation of the steel sheet pile in the ground is small near the ground surface, and the displacement of the joint increases as the driving depth increases, but when the depth exceeds a certain depth, the displacement increases. Stop.

  If the half width L of the deformation restraining jig is set to 2.2 times or more of the thickness t1 of the flange of the steel sheet pile, the displacement amount of the joint in the fitting joint can be surely accommodated in the joint clearance. Therefore, the half width L of the deformation restraining jig is set to 2.2 times or more the thickness of the steel sheet pile flange (see FIG. 13A). However, in order to simplify the manufacturing process, it is desirable that the thickness be at least three times the flange thickness t1.

  The thickness t2 of the deformation restraining jig is desirably equal to or greater than the thickness t1 in order to surely restrain the corner portion formed by the flange and the web having the thickness t1 (FIG. 13 ( a), see).

  Moreover, according to FIG. 14, if the deformation | transformation suppression jig | tool of the length less than 1/2 of the penetration depth below the ground surface from the lower end of a steel sheet pile is attached to a corner part, a deformation | transformation suppression effect will be effective. Can be obtained.

  However, when steel sheet piles are used repeatedly for temporary use, etc., the number of times the steel sheet piles are placed increases, and deformation accumulates as the number of placements increases. It is desirable to attach a deformation restraining jig to the corner portion over a half or more of the length.

  In the mounting of the deformation restraining jig to the corner portion of the steel sheet pile, there are various mounting modes for mounting the steel sheet pile in the axial direction.

  FIG. 15 shows various mounting modes. FIG. 15 (a) shows a mode in which the deformation restraining jig is continuously attached over the entire length in the axial direction of the steel sheet pile, and FIG. 15 (b) shows intermittently over the entire length in the axial direction of the steel sheet pile. Fig. 15 (c) shows a mode in which the deformation suppression jig is mounted, and Fig. 15 (c) shows a mode in which the deformation suppression jig is continuously mounted in the required range in the lower part in the axial direction of the steel sheet pile. The aspect which attached | subjected the deformation | transformation suppression jig | tool intermittently to the required range of the lower part in the axial direction of a steel sheet pile at d) is shown.

  FIG. 15 illustrates a mounting mode in which the deformation suppression jig is mounted continuously or intermittently in the axial direction of the steel sheet pile, but the mounting mode is not limited to the mounting mode illustrated in FIG. If it is mounted intermittently, the material cost can be reduced, but the welding effort increases, and the resistance at the time of placing increases due to the increased resistance area.

  Based on this, the mounting mode may be selected as appropriate. For example, continuous mounting and intermittent mounting may be used together at one corner, or continuous mounting at one corner and intermittent mounting at another corner.

  When the deformation suppression jig is intermittently mounted, the interval between the deformation suppression jig and the deformation suppression jig may be set as appropriate in relation to the width of the deformation suppression jig.

  When the width of the deformation suppression jig is increased, the deformation suppression effect increases (see FIG. 13A). Therefore, the length of the deformation suppression jig required in the axial direction is increased by the width of the deformation suppression jig. Can be reduced. Therefore, the length and intermittent interval of the deformation restraining jig in the axial direction are appropriately determined based on the width of the deformation restraining jig.

  As mentioned above, the deformation of steel sheet piles in the ground is small near the ground surface and increases with the depth of placement, so only the lower end of the steel sheet pile where deformation is dominant is used. You may attach to. If a deformation | transformation suppression jig | tool is mounted | worn only to the lower end part of a steel sheet pile, material cost and work cost can be reduced.

  When the cross-sectional area of the steel sheet pile increases, the resistance during placing increases. In order to reduce the casting resistance of the steel sheet pile with the deformation restraining jig, and to place it, a cut may be made at the lowest end of the deformation restraining jig. FIG. 16 shows a cross section of the deformation restraining jig 10a having a notch 9a at the lowermost end.

  Although FIG. 11A shows a mode in which the deformation preventing jig is mounted on the outer surface and the inner surface of the corner portion, round steel or bar steel may be mounted as long as the deformation suppression effect can be secured. FIG. 17 shows an aspect in which round steel is mounted on the inner surface of the corner portion. A mounting mode is shown in which a deformation preventing jig is mounted on the outside of the corner portion 1c that connects the flange 1e and the web 1f, and round steel is mounted on the inside of the corner portion 1c.

  By installing round steel or steel bar inside the corner, not only can the deformation resistance be equivalent to the increase in the thickness of the corner, but also the cross-sectional area of the deformation restraint jig made of plate-like members. With the mounting of round steel or steel bar having a smaller cross-sectional area, it is possible to reduce the placement resistance in the closed region, so that the steel sheet pile can be placed smoothly. Further, by using inexpensive round steel or steel bar, deformation of the steel sheet pile can be suppressed at low cost.

  So far, the deformation restraining jig having two plate surfaces has been described, but the deformation restraining jig is not limited to a shape having two plate surfaces. As long as an effect capable of suppressing the deformation of the steel sheet pile is obtained, various shapes of deformation suppressing jigs can be used.

  FIG. 18 shows various shapes of deformation restraining jigs. Any deformation restraining jig having a shape that can be mounted on one side or both sides of the web and the flange, or one side or both sides of the web and the arm may be used.

  FIGS. 18A to 18C show a mode in which the plate-shaped deformation restraining jig 10c is mounted on one or both surfaces of the flange and the web by overlay welding. Since it is not necessary to produce a plate member along the shape of the corner portion, deformation can be suppressed at a low cost.

  When the resistance against deformation is compared between the deformation restraining jig shown in FIG. 18A and the deformation restraining jig shown in FIG. 18B, the thickness of the web is increased in order to prevent the corner from spreading. 18 is more effective, the deformation restraining jig shown in FIG.

  FIG. 18 (d) shows a mode in which a steel material 10d having a polygonal cross section having a shape matching the inner surface of the corner portion is attached to the inside of the corner portion by welding as a deformation preventing jig. Although it is necessary to manufacture a polygonal member along the shape of the corner portion, the plate thickness of the corner portion is greatly increased, so that the effect of suppressing the deformation of the corner portion is very large.

  FIG. 18 (e) shows a mode in which the end of the deformation suppressing jig 10e having a chevron cross section is welded to the flange and the web. Since the shape steel distributed in the market can be used as it is, there is no need for shape processing along the corner portion, and deformation of the corner portion can be suppressed at a low cost. Instead of the chevron cross section, a groove cross section or an H cross section may be used.

  FIG. 18 (f) shows a mode in which two plate-shaped deformation preventing jigs 10 c are arranged so as to match the outer surface of the corner portion and are mounted by overlay welding. Similarly to FIGS. 18A to 18C, since it is not necessary to manufacture a plate member along the shape of the corner portion, deformation of the steel sheet pile can be suppressed at a low cost.

  As described above, according to the present invention, when the steel sheet piles are stacked, the distance between the steel sheet piles can be maintained, so that deformation due to stacking can be prevented, and at the time of placing the steel sheet piles, The spread of the steel sheet pile can be suppressed by suppressing the spread.

  Further, according to the present invention, on-site processing is possible, and in particular, when a steel sheet pile having a thin plate thickness is used repeatedly, the trouble of correction after drawing is saved, and the number of times of repeated use increases. Therefore, the present invention has high applicability in the civil engineering industry.

DESCRIPTION OF SYMBOLS 1 Steel sheet pile 1a Steel sheet pile before a deformation | transformation 1b Steel sheet pile after a deformation | transformation 1c Corner part 1c 'Expanded corner part 1c "Inner area | region of a corner part 1d Joint 1d' Fitting joint 1e Flange 1f Web 1g Arm 1y Hat shape Steel sheet pile 1y 'Stacking interval holding portion 1z U-shaped steel sheet pile 1' Steel sheet pile wall 2, 2a, 2b Blocking region 3 Guide beam 4 Guide pile 5 Ground 6 H-section steel 7 Steel pipe pile 8 Stiffening member 9 Tip protector 9a Cut 10a, 10b, 10a 'Deformation restraining jig 10c Plate steel 10d Steel with polygonal cross section 10e Steel with chevron cross section 11 Round steel 12 Overlay welding d1, d2 Distance from neutral shaft D Joint clearance t1 Flange thickness t2 Deformation suppression jig thickness P Horizontal earth pressure W1, W2 Deformation width

Claims (5)

It is a plate-like member that is attached to a corner formed by a web and a flange of a steel sheet pile, or a web and an arm,
The plate-like member comprises a plate surface that matches the inner surface or outer surface of the corner portion of the steel sheet pile,
The half width of the plate-like member is at least 2.2 times the steel sheet pile flange plate thickness,
The inner surface of the corner portion, the outer surface, or on both sides, hitting設時deformation inhibiting jig steel sheet pile, characterized in that mounted in the axial direction of the steel sheet pile. The said sheet-like member is continuously or intermittently mounted over the entire length of the steel sheet pile along the axial direction of the steel sheet pile. Ingredients. The plate-like member is mounted in the axial direction of the steel sheet pile, continuously or intermittently, within a range of less than ½ of the penetration depth below the ground surface from the lower end of the steel sheet pile. The deformation suppression jig | tool at the time of casting of the steel sheet pile of Claim 1. The steel sheet pile deformation restraining jig according to any one of claims 1 to 3, wherein a notch is formed at a lowermost end of the plate-like member. 5. The steel sheet pile deformation restraining jig according to any one of claims 1 to 4 , wherein the plate member is mounted by welding, a bolt, or an adhesive.

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