Construction method for steel sheet pile walls and steel sheet pile walls

Abstract

By using connecting members that are easy to drive and extract using construction machinery, it becomes easier to reuse the connecting members together with the steel sheet piles. [Solution] A method for constructing a steel sheet pile wall is provided, which uses a connecting member having a flat plate-shaped gripping portion and first and second joint portions formed at the ends of the gripping portion in its cross-sectional shape, wherein at the corner of the steel sheet pile wall, the connecting member connects steel sheet piles that, in their planar arrangement, form an angle exceeding the fitting angle of the joints of the steel sheet piles.

Description

Technical Field

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[0003] , ,

[0001] The present invention relates to a method for constructing a steel sheet pile wall and a steel sheet pile wall.

Background Art

[0002] Due to obstacles of existing structures and the shape of excavation sites, the steel sheet pile wall may be bent in its planar shape. When bending exceeding the fitting margin of the joint of the steel sheet piles is required, such as at the corner, a corner steel sheet pile with a special joint is used. Also, when the arrangement or angle of the bent portion exceeds the range that can be handled by the corner steel sheet pile, or when a branch is required in the steel sheet pile wall, a deformed steel sheet pile having a shape like a combination of a part of another steel sheet pile on one steel sheet pile is used. Since the corner steel sheet pile and the deformed steel sheet pile are factory processed, they need to be managed separately from other sheet piles at the site, making the process complicated. Also, for the corner steel sheet pile, the bending shape is limited for each type, and for the deformed steel sheet pile, since the shape is determined and manufactured before construction, fine adjustment of the angle at the site is difficult, and depending on the shape and construction location, different types of construction machinery may be required compared to other steel sheet piles. Further, depending on the shape, it is difficult to stack the deformed steel sheet piles stably, and spacers etc. may be required, making transportation not easy in some cases. In view of these points, for example, connecting members for steel sheet piles as described in Patent Document 1, Patent Document 2, and Patent Document 3 have been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the present invention aims to provide a method for constructing a steel sheet pile wall and a steel sheet pile wall that facilitates the reuse of connecting members together with steel sheet piles by using connecting members that are easy to drive and extract using construction machinery. [Means for solving the problem]

[0006] [1] A method for constructing a steel sheet pile wall using a connecting member having a flat plate-shaped gripping portion and first and second joint portions formed at the ends of the gripping portion in cross-sectional shape, wherein at the corner of the steel sheet pile wall, the connecting member connects steel sheet piles that, in planar arrangement, form an angle exceeding the fitting angle of the joints of the steel sheet piles. [2] The method for constructing a steel sheet pile wall according to [1], wherein the connecting member is driven in the corner after the steel sheet pile. [3] A method for constructing a steel sheet pile wall using a connecting member having a flat gripping portion and first and second joint portions formed at the ends of the gripping portion in its cross-sectional shape, the method comprising the steps of: gripping the gripping portion with a construction machine and pulling out the connecting member from a first steel sheet pile wall constructed by fitting the first and second joint portions into joints of steel sheet piles, respectively; and reusing the connecting member for the construction of a second steel sheet pile wall. [4] In the step of reusing the connecting member, the gripping portion is gripped with the same type of construction machine as in the step of pulling out the connecting member, and the connecting member is driven into the ground, the construction method for steel sheet pile walls according to [3]. [5] The method for constructing a steel sheet pile wall according to [3], wherein the angle formed in a planar arrangement of the steel sheet piles to which the joints are fitted in the first and second joints in the second steel sheet pile wall is different from the angle formed in a planar arrangement of the steel sheet piles to which the joints are fitted in the first and second joints in the first steel sheet pile wall. [6] The method for constructing a steel sheet pile wall according to [3], wherein the internal space of the first and second joints in the cross-sectional shape is larger than the internal space of the joint of the steel sheet pile, and further comprising the steps of measuring the dimensions of the internal space of the first and second joints in the connecting member after extraction, and correcting the first and second joints according to the results of the measurement. [7] The method for constructing a steel sheet pile wall according to [3], further comprising the step of applying or filling the internal space of the first and second joints in the connecting member after it has been pulled out and before it has been reused. [8] The method for constructing a steel sheet pile wall according to [3], further comprising the step of filling the internal spaces of the first and second joints with a watertight material in the connecting member after it has been driven in for reuse. [9] In the step of withdrawing the connecting member, the connecting member is withdrawn together with the steel sheet pile while the joint of the steel sheet pile is fitted into at least one of the first or second joint portions, the method for constructing a steel sheet pile wall according to [3].

[10] In the step of reusing the connecting member, the connecting member is driven together with the steel sheet pile with the joint of the steel sheet pile fitted into at least one of the first or second joint portions, the method for constructing a steel sheet pile wall according to [3].

[11] The method for constructing a steel sheet pile wall according to [1] or [3], wherein the driving depth of the connecting member is shallower than the driving depth of the steel sheet piles into which the joints are fitted in the first and second joints.

[12] The method for constructing a steel sheet pile wall according to [1] or [3], wherein the connecting member further has a third joint formed at the end of the gripping portion.

[13] The method for constructing a steel sheet pile wall according to

[12] , wherein the connecting member further has a fourth joint formed at the end of the gripping portion.

[14] A steel sheet pile wall using a connecting member having a flat gripping portion and first and second joint portions formed at the ends of the gripping portion in cross-sectional shape, wherein at the corner of the steel sheet pile wall, the connecting member connects steel sheet piles that, in planar arrangement, form an angle exceeding the fitting angle of the joints of the steel sheet piles.

[15] A steel sheet pile wall using a connecting member having a flat gripping portion and first and second joint portions formed at the end of the gripping portion in its cross-sectional shape, wherein the first and second joint portions are fitted into joints of steel sheet piles to construct the steel sheet pile wall, and the connecting member is driven in such a way that the gripping portion can be gripped and pulled out by a construction machine.

[16] The steel sheet pile wall according to

[14] or

[15] , wherein the driving depth of the connecting member is shallower than the driving depth of each of the steel sheet piles into which the joints are fitted to the first and second joint portions.

[17] The steel sheet pile wall according to

[14] or

[15] , wherein a watertight material is applied to or filled into the internal spaces of the first and second joints.

[18] The steel sheet pile wall according to

[14] or

[15] , wherein the connecting member further comprises a third joint formed at the end of the gripping portion.

[19] The connecting member further has a fourth joint portion formed at the end of the gripping portion,

[18] Steel sheet pile wall. [Effects of the Invention]

[0007] With the above configuration, the connecting member can be stably gripped by the construction machine using the flat gripping portion, making it easy to drive and remove the connecting member using the construction machine, and thus making it easy to reuse the connecting member together with the steel sheet pile. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a first example of a connecting member for steel sheet piles according to an embodiment of the present invention. [Figure 2] It is a figure showing a second example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 3] It is a figure showing a third example of a connecting member of a steel sheet pile according to an embodiment of the present invention. <X [Figure 4] It is a figure showing a fourth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 5] It is a figure showing a fifth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 6] It is a figure showing a sixth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 7] It is a figure showing a seventh example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 8] It is a figure showing an eighth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 9] It is a figure for explaining an example of dimensions of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 10] It is a figure showing a first example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 11] It is a figure showing a second example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 12] It is a figure showing a third example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 13] It is a figure showing a fourth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 14] It is a figure showing a fifth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 15] It is a figure showing a sixth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 16] It is a figure showing a seventh example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 17] It is a figure for conceptually explaining the reuse of the connecting member. [Figure 18] It is a figure showing another example of a corner portion in a steel sheet pile wall including a connecting member. [Figure 19]This figure shows yet another example of a corner section in a steel sheet pile wall including connecting members. [Figure 20] This is a diagram illustrating the internal space of the joint in a connecting member. [Figure 21] This is a diagram illustrating an example of the casting depth for connecting members. [Figure 22] This diagram illustrates an example of placing a watertight material at the joint of a connecting member. [Modes for carrying out the invention]

[0009] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In this specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions will be omitted.

[0010] Figure 1 shows a first example of a steel sheet pile connecting member according to an embodiment of the present invention. In the illustrated example, the connecting member 10A is a long member as shown in Figure 1(a), and in its cross-sectional shape, includes a flat gripping portion 11 and a joint portion 12A formed at the end of the gripping portion 11. The gripping portion 11 has a length that can be gripped by the chuck portion 51 of a construction machine, as shown in Figure 1(b). The construction machine is, for example, a vibro-hammer or a press-in machine. Here, the length of the gripping portion 11 means the length in the cross-section as shown in Figure 1(b). The fact that the gripping portion 11 is flat means that the dimension of the gripping portion 11 in the thickness direction is smaller than the dimension of the joint portion 12A in the same direction. The joint section 12A includes four joint sections 12A1, 12A2, 12A3, and 12A4 (the first, second, third, and fourth joint sections), each of which can be fitted into a joint of a steel sheet pile. In the illustrated example, the joint sections 12A1 to 12A4 are all formed at one end of the gripping section 11, and no joint section is formed at the other end of the gripping section 11.

[0011] Such connecting members 10A can be stably stacked and stored by arranging the gripping portion 11 and the joint portion 12A alternately, as shown in Figure 1(c). In this case, the bottom connecting member 10A may be positioned so that the gripping portion 11 is horizontal, for example, by using a spacer of the same height as the joint portion 12A protruding from the gripping portion 11. Alternatively, each member may be stacked diagonally to match the inclination of the bottom connecting member 10A. In either case, gaps are created between the gripping portions 11 of the stacked connecting members and between the gripping portion 11 of the bottom connecting member and the ground or floor surface. Therefore, for example, if the chuck portion 51 of a construction machine is thin, it can directly grip the gripping portions 11 of the stacked connecting members 10A.

[0012] Figures 2 to 5 show second to fifth examples of steel sheet pile connecting members according to embodiments of the present invention. In all of these examples, similar to the example in Figure 1, the joint portion is formed only at one end of the gripping portion 11. In each figure, (a) shows the entire elongated connecting member, (b) shows a cross-section of the connecting member gripped by the chuck portion 51 of the construction machine, and (c) shows a state in which multiple connecting members are stacked. Figure 2 shows an example of a connecting member 10B in which the joint portion 12B includes two joint portions 12B1 and 12B2 (first and second joint portions). In the example in Figure 2, the joint portion 12B1 includes a hook-shaped portion as well as a retaining portion that prevents the joint of the steel sheet pile fitted into the hook-shaped portion from coming loose. By forming a retaining portion in the joint portion 12B1 in this way, the tolerance in the fitting angle when fitting the joint portion of a steel sheet pile into the joint portion 12B1 can be made larger than the tolerance in the fitting angle when fitting the joint portions of steel sheet piles together, for example. Figure 3 also shows an example of a connecting member 10C in which the joint portion 12C includes two joint portions 12C1 and 12C2 (first and second joint portions). The connecting members 10B and 10C in the examples of Figures 2 and 3 can be used differently depending on, for example, the type of steel sheet pile to be fitted into each joint portion, or whether or not the connecting member is located at a bend in the steel sheet pile wall.

[0013] Figure 4 shows an example of a connecting member 10D in which the joint portion 12D includes three joint portions 12D1, 12D2, and 12D3 (first, second, and third joint portions), and Figure 5 shows an example of a connecting member 10E in which the joint portion 12E includes four joint portions 12E1, 12E2, 12E3, and 12E4 (first, second, third, and fourth joint portions), which are different from the example in Figure 1. In the examples in Figures 4 and 5, a substantially circular bulge is formed at the tip of each joint portion. Such bulges can also make the tolerance in the fitting angle when fitting the joint portions of steel sheet piles to the joint portions 12D1 to 12D3 or joint portions 12E1 to 12E4 greater than the tolerance in the fitting angle when fitting the joint portions of steel sheet piles to each other. As shown in the example in Figure 1 and the examples in Figures 4 and 5, a connecting member including three or more joints may be used, for example, at the branching point of a steel sheet pile wall, as in the example described later, or a joint may be selected to fit the steel sheet pile joint according to the type of steel sheet pile and the angle of the bend of the steel sheet pile wall.

[0014] In the connecting member described with reference to Figures 1 to 5 above, the gripping portion 11 is not used for connecting steel sheet piles. However, the presence of the flat gripping portion 11 allows the connecting member to be stably gripped by construction machinery. Therefore, the process of pre-fitting and welding the connecting member to the steel sheet pile is unnecessary, and the connecting member can be driven in while adjusting the angle and other aspects to match the driving position of the immediately preceding steel sheet pile. Furthermore, since the dimensions of the gripping portion 11 in the thickness direction are smaller than the dimensions of the joint portion, the resistance to press-fitting at the gripping portion 11 during driving can be reduced. Because the joint portion protrudes from at least one side in the thickness direction of the gripping portion 11, the connecting members can be stably stacked and stored by arranging the gripping portion 11 and the joint portion alternately, for example, making them easy to handle.

[0015] Figures 6 to 8 show sixth to eighth examples of steel sheet pile connecting members according to embodiments of the present invention. Unlike the examples in Figures 1 to 5, these examples have joints formed at both ends of the gripping portion 11. As with the examples in Figures 1 to 5, in each figure (a) shows the entire elongated connecting member, (b) shows a cross-section of the connecting member gripped by the chuck portion 51 of the construction machine, and (c) shows a state in which multiple connecting members are stacked. Figure 6 shows an example of a connecting member 10F in which a first joint portion 12F1 is formed at one end of the gripping portion 11 and a second joint portion 12F2 is formed at the other end of the gripping portion 11. The first joint portion 12F1 and the second joint portion 12F2 each consist of one joint portion including a holding portion. Such connecting members 10F can also be stacked and stored stably by inverting the stacked connecting members as shown in Figure 6(c) and aligning the positions of the joints 12F1 and 12F2 with the gripping portion 11. If the heights of the joints 12F1 and 12F2 protruding from the gripping portion 11 are approximately the same, the gripping portion 11 of the bottom connecting member can be positioned horizontally without using spacers.

[0016] Figure 7 shows an example of a connecting member 10G in which a first joint portion 12G1 is formed at one end of the gripping portion 11 and a second joint portion 12G2 is formed at the other end of the gripping portion 11. The first joint portion 12G1 includes two joint portions 12G1-1 and 12G1-2, and the second joint portion 12G2 also includes two joint portions 12G2-1 and 12G2-2. As shown in Figure 7(c), the connecting member 10G can be stacked without inverting because the joint portions 12G1 and 12G2 protrude on both sides in the thickness direction of the gripping portion 11. Figure 8 shows an example of a connecting member 10H in which a first joint portion 12H1 is formed at one end of the gripping portion 11 and a second joint portion 12H2 is formed at the other end of the gripping portion 11. In the connecting member 10H, the first joint portion 12H1 includes two joint portions 12H1-1 and 12H1-2, and the second joint portion 12H2 includes two joint portions 12H2-1 and 12H2-2. The joint portions 12H1-1 and 12H1-2 include a common holding portion. A connecting member having three or more joint portions on both sides of the gripping portion 11, as in the example in Figures 7 and 8, may be used, for example, at the branching portion of a steel sheet pile wall, as in the example described later, or joint portions that fit the steel sheet pile joints may be selected according to the type of steel sheet pile and the angle of the bend of the steel sheet pile wall.

[0017] As described with reference to Figures 6 to 8 above, the connecting member can be stably gripped by construction machinery using the flat plate-shaped gripping portion 11, and the resistance to press-fitting at the gripping portion 11 during driving can be reduced. Furthermore, by arranging the gripping portion 11 and the joint portion alternately, for example, the connecting members can be stably stacked and stored, making them easy to handle. By forming the joint portion on both sides of the gripping portion 11, for example, many types of joints can be formed to accommodate various types of steel sheet piles and connection angles. In addition, the shape of the wall can be adjusted by changing the length of the gripping portion.

[0018] The length of the connecting member according to this embodiment, as described above, i.e., the dimension in the depth direction during driving, may be the same as or different from the steel sheet piles being connected. Specifically, when the steel sheet pile wall is a retaining wall, a connecting member is not necessarily required in the embedded portion, so the connecting member may be shorter than the steel sheet pile, for example, a length that takes into account the influence of seepage flow such as piping by groundwater in addition to the length of the steel sheet pile excluding the embedded portion. Such a length may be, for example, about 1.2 times the length of the steel sheet pile excluding the embedded portion, but is not particularly limited. Also, if the necessary length cannot be secured due to constraints on means of transportation or storage site, the connecting members may be joined longitudinally. For longitudinal joints, for example, butt welding, fillet welding using splice plates, or bolted joints can be used.

[0019] The connecting member according to this embodiment, as described above, may be manufactured by integrally forming the entire structure, including the gripping portion and the joint portion, by hot rolling, cold rolling, or hot extrusion. Integral forming by the above manufacturing method makes it easy to manufacture even when complex curved surfaces, such as recesses or curved surfaces, are formed at the joint. The connecting member may also be manufactured using a 3D printer. If the connecting member can be manufactured in real time using a 3D printer outside of a factory, for example, the connecting member can be manufactured by setting an appropriate shape and rotational margin according to the condition of the steel sheet pile at the site.

[0020] Figure 9 is a diagram illustrating an example of the dimensions of a connecting member for steel sheet piles according to an embodiment of the present invention. Figure 9 shows the aspect ratio a / b of the cross-section, the length L of the gripping portion, the plate thickness t1 of the gripping portion, and the minimum plate thickness t2 at the joint portion, using the connecting member described above with reference to Figure 1 as an example. The aspect ratio a / b of the cross-section is expressed as a being the dimension in the first direction in which the flat plate-shaped gripping portion extends in the cross-section of the connecting member, and b being the dimension in the second direction perpendicular to the first direction. The longer the flat plate portion and the smaller the protrusion of the joint portion, the larger the aspect ratio a / b becomes. Conversely, the shorter the flat plate portion and the larger the protrusion of the joint portion, the smaller the aspect ratio a / b becomes.

[0021] The aspect ratio of the cross-section of the connecting member in the embodiments of the present invention is not necessarily limited, but from the viewpoint of suppressing torsional deformation that occurs when the connecting member is driven into the ground, the aspect ratio a / b is preferably 3.0 or more, more preferably 4.0 or more, and even more preferably 5.0 or more. By suppressing the torsional deformation of the connecting member, the friction when fitting the joint portion of the connecting member driven into the ground with the joint portion of the steel sheet pile that has been driven in advance is reduced, and the connecting member can be driven smoothly. Furthermore, by suppressing the torsional deformation of the driven connecting member, the driving of the steel sheet pile to be connected next can also be made smoother.

[0022] Furthermore, the length L of the gripping portion of the connecting member in the embodiments of the present invention is not necessarily limited as long as it is a length that can be gripped by the construction machine, but it is preferable that the length L of the gripping portion be 100 mm or more so that it can be gripped by a general construction machine. By ensuring a sufficient length L of the gripping portion, the load can be transmitted more reliably from the construction machine during concrete placement and removal, and stable construction can be performed without the connecting member falling off. If the width of the chuck portion of the construction machine is known, stable gripping can be achieved by making the length L of the gripping portion about 50 mm longer than the width of the chuck portion of the construction machine. Note that the length L of the gripping portion is not necessarily limited in relation to the width of the chuck portion of the construction machine, and for example, the length L of the gripping portion may be shorter than the width of the chuck portion of the construction machine. In this case, a plate may be welded to the gripping portion at the end of the connecting member, and the end of the plate may be gripped by the chuck portion of the construction machine. In this case as well, the plate can be stably welded by having a length L of the gripping portion. The plate thickness t1 of the gripping portion is not particularly limited as long as it is smaller than the dimensions of the joint portion in the plate thickness direction of the gripping portion as described above, but from the viewpoint of stably transmitting the load from the construction machine and reducing the resistance to press-fitting, it is preferably 9 mm to 20 mm, and more preferably 10 mm or more. The minimum plate thickness t2 at the joint portion is also not particularly limited, but it is preferably larger than the minimum plate thickness at the joint portion of the steel sheet pile to be fitted. This allows the joint portion of the connecting member to exhibit higher load-bearing capacity than the joint portion of the steel sheet pile, and prevents the connecting member from deforming and detaching from the steel sheet pile.

[0023] The following describes examples of steel sheet pile walls using the connecting members described above. Although each example is described using a specific type of connecting member, it is also possible to construct similar steel sheet pile walls with other types of connecting members, and the following description does not limit the relationship between the type of connecting member and the shape of the steel sheet pile wall.

[0024] Figure 10 shows a first example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100A including steel sheet piles 101 and 102 is constructed using a connecting member 10A. Steel sheet pile 101 is a U-shaped steel sheet pile, and steel sheet pile 102 is a hat-shaped steel sheet pile. Even when the first and second steel sheet piles connected by the connecting member 10A are of different types, and therefore the shapes of the joints of each steel sheet pile are different, the steel sheet pile wall can be constructed by appropriately designing the shape and angle of the joint of the connecting member 10A, for example, so that the joint of the connecting member 10A is fitted into the respective joints of the steel sheet piles 101 and 102. The type of steel sheet pile connected by the connecting member is not limited to hat-shaped or U-shaped, but may also be Z-shaped or straight steel sheet piles.

[0025] Figure 11 shows a second example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100B including steel sheet piles 103, 104, 105, and 106 is constructed using a connecting member 10B. The extension direction D1 of the portion of the steel sheet pile wall 100B including steel sheet pile 103, the extension direction D2 of the portion including steel sheet piles 104 and 105, and the extension direction D3 of the portion including steel sheet pile 106 are different. In other words, the connecting member 10B is positioned in the bent portion of the steel sheet pile wall 100B. Since the steel sheet piles are connected to each other via the connecting member 10B in the bent portion, corner steel sheet piles do not need to be used, and it is possible to use the same type of steel sheet pile for steel sheet piles 103 to 106. Although steel sheet piles 103 to 106 are all hat-shaped steel sheet piles, a similar configuration is possible with other types of steel sheet piles such as U-shaped steel sheet piles. By using a connecting member such as connecting member 10B, which has a holding portion formed at the joint and has a large margin of error in the fitting angle when fitted with the joint portion of the steel sheet pile, it is possible to increase the range of angles of the bending portion that can be accommodated.

[0026] In the example shown in Figure 11 above, the arm portion of the steel sheet pile 104 and the gripping portion of the connecting member 10B are in close proximity in planar arrangement. If the steel sheet pile 104 is driven in first, it is difficult to grip the gripping portion of the connecting member 10B and drive it in at the same height as the steel sheet pile 104. In such cases, for example, by driving the steel sheet piles in order from the steel sheet pile 103 side and driving the connecting member 10B before the steel sheet pile 104, the upper end heights of the connecting member 10B and the steel sheet pile 104 can be aligned. Alternatively, if the connecting member 10B and the steel sheet pile 104 are fitted together on the ground beforehand and driven in simultaneously, the upper end heights of the connecting member 10B and the steel sheet pile 104 can be aligned regardless of the order in which the steel sheet piles are driven. Even if the steel sheet pile 104 has been driven in beforehand, it is still possible to drive the connecting member 10B if it is set to a height higher than the steel sheet pile 104, that is, if the upper end of the connecting member 10B is higher than the upper end of the steel sheet pile 104. In this case, the connecting member 10B may be driven in and then the protruding upper end of the connecting member 10B may be cut off.

[0027] Figure 12 shows a third example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100C including steel sheet piles 107 and 108 is constructed using a connecting member 10C. The extension direction D4 of the portion of the steel sheet pile wall 100C including steel sheet pile 107 and the extension direction D5 of the portion including steel sheet pile 108 are different by approximately 90 degrees. The connecting member 10C has a shape optimized for connecting steel sheet piles 107 and 108 at such corners without using corner steel sheet piles.

[0028] Figure 13 shows a fourth example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100D including steel sheet piles 109, 110, 111, 112, and 113 is constructed using a connecting member 10D. In the steel sheet pile wall 100D, a steel sheet pile 111 is arranged as a partition wall between the wall body including steel sheet piles 109 and 110 and the wall body including steel sheet piles 112 and 113, and the connecting member 10D is arranged at the branching point between each wall body and the steel sheet pile 111. More specifically, the joint portion of steel sheet pile 109 (first steel sheet pile) is fitted into the first joint portion of the connecting member 10D, the joint portion of steel sheet pile 110 (second steel sheet pile) is fitted into the second joint portion of the connecting member 10D, and the joint portion of steel sheet pile 111 (third steel sheet pile) is fitted into the third joint portion of the connecting member 10D, thereby forming a branching point. The same applies to the branching section between steel sheet piles 111, 112, and 113. At the branching section, the steel sheet piles are connected to each other via connecting member 10D, so it is not necessary to use irregularly shaped steel sheet piles, and it is possible to use steel sheet piles 109 to 113 of the same type. By using a connecting member such as connecting member 10D, which has a roughly circular bulge at the tip of the joint and has a large margin of error in the fitting angle when fitted with the joint of the steel sheet pile, it is possible to absorb positional errors due to dimensional errors or construction errors in the steel sheet pile 111 which is arranged as a partition wall between two walls.

[0029] Figure 14 shows a fifth example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100E including steel sheet piles 114, 115, 116, 117, 118, and 119 is constructed using a connecting member 10E. In the steel sheet pile wall 100E, steel sheet piles 116 and 117 are arranged as partition walls between the wall body including steel sheet piles 114 and 115 and the wall body including steel sheet piles 118 and 119, and the connecting member 10E is positioned at the branching point between each wall body and the steel sheet piles 116 and 117. A branch section is formed when the joint of steel sheet pile 114 (first steel sheet pile) is fitted into the first joint of connecting member 10E, the joint of steel sheet pile 115 (second steel sheet pile) is fitted into the second joint of connecting member 10E, and the joint of steel sheet pile 116 (third steel sheet pile) is fitted into the third joint of connecting member 10E. The same applies to the branch section between steel sheet piles 117, 118, and 119. Although connecting member 10E has four joint sections, as shown in the illustrated example, only three of these joint sections may be used for fitting with the joint sections of the steel sheet piles, and the connecting member 10E may be driven into the ground without fitting the remaining joint sections.

[0030] Figure 15 shows a sixth example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100F including steel sheet piles 120 is constructed using a connecting member 10F. The connecting member 10F is positioned at the corner of the steel sheet pile wall 100F and fits into the joints of the steel sheet piles 120 on both sides. As described above, since both joints of the connecting member 10F include holding portions, it can be positioned at bends at various angles, not just corners, and can connect different types of steel sheet piles.

[0031] Figure 16 shows a seventh example of a steel sheet pile wall according to an embodiment of the present invention. In the illustrated example, a steel sheet pile wall 100H including steel sheet piles 121 and 122 is constructed using a connecting member 10H. Steel sheet pile 121 is a hat-shaped steel sheet pile, and steel sheet pile 122 is a U-shaped steel sheet pile. Since the connecting member 10H has two joint portions formed on both sides of the gripping portion, for example, as in the example in Figure 16, the gripping portion is arranged in the wall thickness direction (a direction intersecting the extension direction of the wall body), and the shape of the wall body, specifically the position of the steel sheet piles 121 and 122 in the wall thickness direction, is adjusted by the length of the gripping portion.

[0032] The following describes a method for constructing a steel sheet pile wall using the steel sheet pile connecting member according to the embodiment of the present invention described above. In the following description, the connecting member 10F according to the sixth example described above is shown as an example, but similar configurations are possible for connecting members of other examples.

[0033] As already mentioned, if a steel sheet pile wall like the one described above is constructed as a temporary structure, the steel sheet piles and connecting members are pulled out from the ground when the structure is removed after its service life ends. The pulled-out steel sheet piles and connecting members can be reused. For example, in the example shown in Figure 17, the connecting member 10F is pulled out from a steel sheet pile wall 100 constructed by fitting the joint portion of the connecting member 10F into the joint of the steel sheet pile 120, and reused in another steel sheet pile wall 200. The steel sheet piles 220 used to construct this steel sheet pile wall 200 together with the connecting member 10F may be different from the previous steel sheet pile wall, as in the illustrated example, or the same steel sheet piles 120 as the previous steel sheet pile wall may be reused together with the connecting member 10F. The steel sheet piles are gripped and pulled out by the chuck portion of construction machinery such as a vibro hammer or press-in machine, just as they were when they were driven. Similarly, the connecting members can be gripped and pulled out by the chuck portion of construction machinery. In the connecting member according to the embodiment of the present invention described above, the presence of a flat gripping portion allows for stable gripping by construction machinery, and facilitates extraction and reuse. The same type of construction machinery can be used during installation, including extraction and reuse. When construction machinery grips steel sheet piles or connecting members, it is not necessary to grip them with a part that is integrally formed as part of the machine; for example, a construction jig or the like may be used to grip them. During installation, including extraction and reuse, the connecting member may be extracted or installed together with the steel sheet piles while the joints of the steel sheet piles are fitted to at least one of the joints. In addition, short sections of a few centimeters to tens of centimeters may be welded between steel sheet piles or between steel sheet piles and connecting members to prevent simultaneous lowering or raising during installation or extraction of other steel sheet piles, but these welds can be easily removed when, for example, the steel sheet piles or connecting members are extracted. Therefore, even when a short section of welding is formed between the connecting member and the steel sheet pile in a steel sheet pile wall, it is possible to grip the gripping portion of the connecting member with construction machinery and pull it out when removing the steel sheet pile wall.

[0034] Unlike connecting members that are fitted to steel sheet piles in advance and integrally fixed by welding or the like, the connecting members according to the embodiment of the present invention can be easily separated from the steel sheet piles during or after extraction. Therefore, the steel sheet piles after extraction are not limited in their use and can be reused as steel sheet piles that are not fitted to the connecting members. In addition, the connecting members can also be used for different purposes in the reused steel sheet pile wall (second steel sheet pile wall) than in the original steel sheet pile wall (first steel sheet pile wall). As exemplified above, applications of the connecting members include connecting different types of steel sheet piles, adjusting angles at bends and corners of steel sheet pile walls, forming branching sections, and adjusting the position of steel sheet piles. For these applications, it is not necessary to manufacture corner steel sheet piles or irregularly shaped steel sheet piles each time, as the same connecting members can be reused for multiple purposes. When the connecting member is extracted together with the steel sheet pile while the joint is fitted to the joint, the connecting member and the steel sheet pile may be separated after extraction, or they may be reused without being separated. Even when the connecting member and the steel sheet pile are reused without being separated, the angle between the steel sheet pile and the connecting member can be readjusted, for example, when reusing, because the connecting member and the steel sheet pile are not fixed together as a single unit.

[0035] Figure 18 shows another example of a corner section in a steel sheet pile wall including connecting members. As shown in the illustrated example, if θ is the angle formed in the planar arrangement of the steel sheet piles 120 into which the joints of the connecting member 10F are fitted, the angle θ in the reused steel sheet pile wall (second steel sheet pile wall) may be different from the angle θ in the original steel sheet pile wall (first steel sheet pile wall). For example, in a similar corner section shown in Figure 15, the angle θ is approximately 90°, but in Figure 18, the angle θ is less than 90°. Both of these angles θ exceed the fitting angle of the joints between the steel sheet piles. The angles θ that the joint members can accommodate are, as an example, between -70° and +150°. As described above, since the connecting member according to this embodiment can be easily separated from the steel sheet pile after extraction, for example, the connecting member 10F that was used at the corner of a steel sheet pile wall as in the example in Figure 15 can be reused at corners of a steel sheet pile wall at different angles as in the example in Figure 18 after extraction.

[0036] Figure 19 shows yet another example of a corner in a steel sheet pile wall including a connecting member. As shown in the illustrated example, when a steel sheet pile 123 is misaligned in the wall thickness direction on one side of the corner, the connecting member 10F may be used to form a corner with a predetermined angle between it and the steel sheet pile 124, and to adjust the position of the steel sheet pile 123 in the wall thickness direction. Thus, the use of the connecting member in this embodiment is not limited to one, and the same connecting member may be used for multiple purposes, such as angle adjustment and position adjustment in the above example. For example, the steel sheet pile walls in Figures 15, 18, and 19 described above can each be constructed by reusing the same connecting member 10F. By driving the connecting member 10F after the steel sheet piles on both sides of the corner, the angle and positional misalignment caused by the driving of the steel sheet piles can be adjusted with the connecting member to close the corner.

[0037] Figure 20 is a diagram illustrating the internal space of the joint portion in the connecting member. As described above, by forming, for example, a holding portion (example in Figure 2) or a bulging portion (example in Figure 4), the tolerance in the fitting angle when fitting the joint portion of a steel sheet pile to the joint portion of the connecting member can be made larger than the tolerance in the fitting angle when fitting, for example, the joint portions of steel sheet piles together. In such a case, in the cross-sectional shapes of the connecting member and the steel sheet pile, the internal space S1 of the joint portion of the connecting member (exemplified as the joint portion 12F2 of connecting member 10F) is larger than the internal space S2 of the joint of the steel sheet pile (exemplified as the joint 1201 of steel sheet pile 120). As a non-limiting example, the internal space S1 has a cross-sectional area that is 1.5 times or more but less than 2 times that of the internal space S2. As mentioned above, this allows for a larger margin in the fitting angle, and also enables the joint to be fitted at an angle with a margin over the geometrically maximum value of the fitted angle with the margin. For example, even if the relative angle with the steel sheet pile changes during driving or extraction, the joint is less likely to deform.

[0038] When reusing connecting members, procedures to maintain the function of the joint as described above may be implemented. Specifically, the dimensions of the internal space of the joint may be measured in the connecting member after extraction, and the joint may be straightened using a press or jack according to the measurement results to ensure the size and verticality of the internal space. In the measurement, for example, a caliper or a sample mold of the joint of a steel sheet pile may be used to confirm that there are no problems with fitting, such as opening width, bending, twisting, or warping. In addition, regardless of the shape of the joint or the size of the internal space, it is desirable to clean the internal space after extraction to ensure smooth fitting with the joint of the steel sheet pile when reused.

[0039] Figure 21 is a diagram illustrating an example of the driving depth of a connecting member. As shown in the example, the driving depth d1 of the connecting member 10F may be shallower than the driving depth d2 of the steel sheet pile 120 into which the joint is fitted at the joint of the connecting member 10F. Although steel sheet pile walls are constructed to resist earth pressure and water pressure, the length occupied by the connecting member in the extension direction of the wall is smaller than that of the steel sheet piles. Therefore, if the driving depth of the steel sheet piles is sufficient, there is no problem even if the driving depth of the connecting member is shallow. By making the driving depth of the connecting member shallower, the overall length of the connecting member can be reduced. In addition, since the connecting member does not necessarily have to be driven to the same depth as the steel sheet piles, the same connecting member can be reused even in steel sheet pile walls with different driving depths for the steel sheet piles. No problems arise even if the driving depth of the connecting members is the same as or greater than the driving depth of the steel sheet piles. For example, if the connecting members prepared for reuse are longer than the steel sheet piles, the driving depth of the connecting members may be greater than that of the steel sheet piles.

[0040] Figure 22 illustrates an example of placing a watertight material at the joint of a connecting member. In the illustrated example, a watertight material W is placed at the joint of a connecting member (exemplified as the joint 12F1 of connecting member 10F) into which a steel sheet pile joint (exemplified as joint 1201 of steel sheet pile 120) is fitted. The watertight material may be applied or filled into the internal space of the joint of the connecting member after extraction and before reuse. Alternatively, the watertight material may be filled into the internal space of the joint of the connecting member after driving. For example, water-absorbing polymers or urethane-based materials can be used as the watertight material to be applied, and bentonite-based or cement-based materials can be used as the watertight material to be filled. By placing a watertight material at the joint of the connecting member, reliable watertight sealing can be achieved while reducing the amount of watertight material used. [Explanation of symbols]

[0041] 10A~10H...Connecting member, 11...Gripping part, 12A~12E...Joint part, 12F1~12H1...First joint part, 12F2~12H2...Second joint part, 51...Chuck part, 100A~100H...Steel sheet pile wall, 101~122...Steel sheet pile, 1201...Joint.

Claims

1. A method for constructing a steel sheet pile wall using a connecting member having a flat plate-shaped gripping portion and first and second joint portions formed at the ends of the gripping portion, A method for constructing a steel sheet pile wall, wherein at the corner of the steel sheet pile wall, the connecting member connects the steel sheet piles at an angle that exceeds the fitting angle of the joint of the steel sheet piles in a planar arrangement.

2. The method for constructing a steel sheet pile wall according to claim 1, wherein the connecting member further has a third joint portion formed at the end of the gripping portion.

3. The method for constructing a steel sheet pile wall according to claim 2, wherein the connecting member further has a fourth joint portion formed at the end of the gripping portion.

4. A steel sheet pile wall using a connecting member having a flat plate-shaped gripping portion and first and second joint portions formed at the ends of the gripping portion, In the corner of the steel sheet pile wall, the connecting member connects the steel sheet piles at an angle exceeding the fitting angle of the joints of the steel sheet piles in a planar arrangement.

5. A steel sheet pile wall using a connecting member having a flat plate-shaped gripping portion and first and second joint portions formed at the ends of the gripping portion, The first and second joints are fitted into the joints of the steel sheet piles, respectively, to construct the steel sheet pile wall. The connecting member is a steel sheet pile wall that is driven in such a way that the gripping portion can be gripped and pulled out by a construction machine.

6. The steel sheet pile wall according to claim 4 or 5, wherein a watertight material is applied to or filled into the internal spaces of the first and second joint portions.

7. The steel sheet pile wall according to claim 4 or 5, wherein the connecting member further has a third joint portion formed at the end of the gripping portion.

8. The steel sheet pile wall according to claim 7, wherein the connecting member further has a fourth joint portion formed at the end of the gripping portion.

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