Steel sheet pile wall construction method and steel sheet pile wall

Abstract

By using a connecting member that can be easily cast and removed using a construction machine, it is made easy to reuse the connecting member together with the steel sheet pile. [Solution] A method for constructing a steel sheet pile wall is provided that uses a connecting member having a cross-sectional shape of a flat holding portion and first and second joint portions formed at the ends of the holding portion, wherein at the corner portions of the steel sheet pile wall, the connecting member connects the steel sheet piles that, in a planar arrangement, form an angle that exceeds the interlocking angle of the steel sheet pile joints.

Description

[Technical field]

[0001] The present invention relates to a steel sheet pile wall construction method and a steel sheet pile wall. [Background technology]

[0002] Steel sheet pile walls may be bent in plan due to the obstruction of existing structures or the shape of the excavation site. When bending that exceeds the fitting tolerance of the joints of steel sheet piles is required, such as at corners, corner steel sheet piles with special joints are used. When the arrangement and angle of the bent part exceeds the range that corner steel sheet piles can handle, or when a branch is required for the steel sheet pile wall, deformed steel sheet piles, which are shaped like one steel sheet pile combined with a part of another steel sheet pile, are used. Corner steel sheet piles and deformed steel sheet piles are processed in factories, so they need to be managed separately from other sheet piles on site, which makes the process complicated. In addition, the shape of the bend is limited for each type of corner steel sheet pile, and deformed steel sheet piles are manufactured before construction, so it is difficult to fine-tune the angle on site, and depending on the shape and construction location, a different type of construction machine may be required for other steel sheet piles. In addition, deformed steel sheet piles are difficult to stack stably depending on their shape, and they may not be easy to transport because they require spacing retainers. In view of these points, connecting members for steel sheet piles as described in, for example, Patent Documents 1, 2 and 3 have been proposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-163904 A [Patent Document 2] Utility Model Registration No. 3188044 [Patent Document 3] Utility Model Registration No. 3188043 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, the connecting members described in Patent Document 1 and Patent Document 2 are fitted to the joints of the steel sheet pile before the steel sheet pile is driven into the ground. On the other hand, Patent Document 3 describes forming a central pressure-resistant part with a substantially rectangular cross section between the connecting parts that fit into the joints of the steel sheet pile, and gripping both sides of this central pressure-resistant part with heavy machinery as support surfaces. For example, in the case of a steel sheet pile wall, which is a temporary structure, the steel sheet pile is often pulled out and reused after its use is terminated. If the connecting members can be gripped by heavy machinery like the steel sheet pile, they can be easily pulled out and reused separately from the steel sheet pile. However, the central pressure-resistant part with a rectangular cross section with a large thickness as described in Patent Document 3 has a large press-in resistance, and the entire connecting member has a cross-sectional shape with many convex parts, so there are problems in that it is necessary to use multiple spacing retainers when stacking and storing them, which is time-consuming.

[0005] Therefore, an object of the present invention is to provide a construction method for a steel sheet pile wall and a steel sheet pile wall that make it easy to reuse connecting members together with the steel sheet piles by using connecting members that are easy to drive and pull out using a construction machine. [Means for solving the problem]

[0006] [1] A method for constructing a steel sheet pile wall using a connecting member having a cross-sectional shape of a flat holding portion and first and second joint portions formed at the ends of the holding portion, wherein, at the corner portions of the steel sheet pile wall, the connecting member connects the steel sheet piles that, in a planar arrangement, form an angle that exceeds the interlocking angle of the joints of the steel sheet piles. [2] A construction method for a steel sheet pile wall as described in [1], in which the connecting members are driven into the corner portions after the steel sheet piles. [3] A method for constructing a steel sheet pile wall using a connecting member having a flat gripping portion in cross-sectional shape and first and second joint portions formed at the ends of the gripping portion, the method comprising the steps of: grasping 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 the steel sheet pile, respectively; and reusing the connecting member in constructing a second steel sheet pile wall. [4] The construction method of a steel sheet pile wall described in [3], in the step of reusing the connecting member, the connecting member is cast by gripping the gripping portion with the same type of construction machine as in the step of pulling out the connecting member. [5] A construction method for a steel sheet pile wall described in [3], wherein the angle formed by the steel sheet piles in a plan arrangement at which joints are fitted into the first and second joint portions in the second steel sheet pile wall is different from the angle formed by the steel sheet piles in a plan arrangement at which joints are fitted into the first and second joint portions in the first steel sheet pile wall. [6] A construction method for a steel sheet pile wall as described in [3], further comprising a step of measuring the dimensions of the internal spaces of the first and second joint portions in the connecting member after pulling out, and a step of correcting the first and second joint portions in accordance with the results of the measurement, wherein in the cross-sectional shape, the internal spaces of the first and second joint portions are larger than the internal spaces of the joints of the steel sheet piles. [7] A construction method for a steel sheet pile wall described in [3], further comprising a step of applying or filling a water-stopping material into the internal spaces of the first and second joint portions of the connecting members after they have been pulled out and before they are reused. [8] A construction method for a steel sheet pile wall described in [3], further comprising a step of filling the internal spaces of the first and second joint portions of the connecting member after pouring in reuse with a water-stopping material. [9] A construction method for a steel sheet pile wall described in [3], in the step of pulling out the connecting member, the connecting member is pulled out together with the steel sheet pile with the joint of the steel sheet pile engaged with at least one of the first or second joint portion.

[10] A construction method for a steel sheet pile wall described in [3], in the process of reusing the connecting member, the connecting member is driven together with the steel sheet pile with the joint of the steel sheet pile engaged with at least one of the first or second joint portion.

[11] A construction method for a steel sheet pile wall described in [1] or [3], wherein the installation depth of the connecting member is shallower than the installation depth of each of the steel sheet piles whose joints are fitted into the first and second joint portions.

[12] A construction method for a steel sheet pile wall described in [1] or [3], wherein the connecting member further has a third joint portion formed at the end of the holding portion.

[13] The construction method of a steel sheet pile wall described in

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

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

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

[16] A steel sheet pile wall as described in

[14] or

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

[17] A steel sheet pile wall as described in

[14] or

[15] , wherein a water-stopping material is applied or filled into the internal space of the first and second joints.

[18] The steel sheet pile wall according to

[14] or

[15] , wherein the connecting member further has a third joint portion formed at an end of the holding portion.

[19] The steel sheet pile wall according to

[18] , wherein the connecting member further has a fourth joint portion formed at an end of the gripping portion. Effect of the Invention

[0007] According to the above-mentioned configuration, the connecting member can be stably held by the construction machine using the flat holding portion, making it easy to drive and pull out the connecting member using the construction machine, and therefore it is also easy to reuse the connecting member together with the steel sheet pile. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing a first example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a diagram showing a second example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a diagram showing a third example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 4] FIG. 11 is a diagram showing a fourth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Diagram 5] FIG. 11 is a diagram showing a fifth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 6] FIG. 11 is a diagram showing a sixth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 7] FIG. 13 is a diagram showing a seventh example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing an eighth example of a connecting member of a steel sheet pile according to an embodiment of the present invention. [Figure 9] FIG. 4 is a diagram 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] FIG. 2 is a diagram showing a first example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 11] FIG. 4 is a diagram showing a second example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 12] FIG. 11 is a diagram showing a third example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 13] FIG. 11 is a diagram showing a fourth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 14] FIG. 11 is a diagram showing a fifth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 15] FIG. 13 is a diagram showing a sixth example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 16] FIG. 13 is a diagram showing a seventh example of a steel sheet pile wall according to an embodiment of the present invention. [Figure 17] FIG. 13 is a diagram for conceptually explaining reuse of a connecting member. [Figure 18] FIG. 11 is a diagram showing another example of a corner portion in a steel sheet pile wall including a connecting member. [Figure 19]FIG. 11 is a diagram showing yet another example of a corner portion in a steel sheet pile wall including a connecting member. [Figure 20] 11A and 11B are diagrams for explaining an internal space of a joint portion in a connecting member. [Figure 21] FIG. 13 is a diagram for explaining an example of the casting depth of the connecting member. [Figure 22] 13A and 13B are diagrams for explaining an example in which a water-stopping material is disposed at a joint portion of a connecting member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

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

[0011] Such connecting members 10A can be stably stacked and stored by arranging the gripping parts 11 and the joint parts 12A alternately as shown in FIG. 1(c). In this case, the connecting member 10A at the bottom may be arranged so that the gripping parts 11 are horizontal, for example, by using a spacer of the same height as the joint parts 12A protruding from the gripping parts 11. Alternatively, each member may be stacked diagonally according to the inclination of the connecting member 10A at the bottom. In either case, a gap is formed between the gripping parts 11 of the stacked connecting members and between the gripping part 11 of the connecting member at the bottom and the ground or floor surface, so that, for example, when the chuck part 51 of the construction machine is thin, the gripping parts 11 of the connecting members 10A stored in a stack can be directly gripped.

[0012] 2 to 5 are diagrams showing second to fifth examples of the connecting member of the steel sheet pile according to the embodiment of the present invention. In all of these examples, the joint portion is formed only at one end of the gripping portion 11, as in the example of FIG. 1. In each figure, (a) shows the whole of the long 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 a plurality of connecting members are stacked. FIG. 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 of FIG. 2, the joint portion 12B1 includes, in addition to a hook-shaped portion, a holding portion that prevents the joint of the steel sheet pile engaged with the hook-shaped portion from coming off. By forming the retaining portion in the joint portion 12B1 in this way, the tolerance of the fitting angle when the joint portion of the steel sheet pile is fitted into the joint portion 12B1 can be made larger than the tolerance of the fitting angle when the joint portions of the steel sheet pile are fitted together. 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 are used depending on, for example, the type of steel sheet pile to be fitted into each joint portion and whether the connecting member is located at a bent portion of the steel sheet pile wall.

[0013] FIG. 4 shows an example of a connecting member 10D in which a joint 12D includes three joints 12D1, 12D2, and 12D3 (first, second, and third joints), and FIG. 5 shows an example of a connecting member 10E in which a joint 12E includes four joints 12E1, 12E2, 12E3, and 12E4 (first, second, third, and fourth joints) different from the example of FIG. 1. In the examples of FIG. 4 and FIG. 5, a substantially circular bulge is formed at the tip of each joint. Such a bulge can also make the tolerance of the fitting angle when fitting the joints of a steel sheet pile into the joints 12D1 to 12D3 or the joints 12E1 to 12E4 larger than the tolerance of the fitting angle when fitting the joints of the steel sheet piles together, for example. A connecting member including three or more joint parts as in the example of Figure 1 and the examples of Figures 4 and 5 may be used at the branch part of a steel sheet pile wall, for example as in the example described below, and a joint part for fitting the joints of the steel sheet pile may be selected according to the type of steel sheet pile and the angle of bending of the steel sheet pile wall.

[0014] In the connecting member described with reference to Figs. 1 to 5 above, the gripping portion 11 is not a portion used for connecting steel sheet piles, but the flat gripping portion 11 allows the connecting member to be stably gripped by a construction machine, eliminating the need for a process of fitting the connecting member to the steel sheet pile in advance and welding it, and the connecting member can be cast while adjusting the angle, etc., according to the casting position of the immediately preceding steel sheet pile. In addition, the dimension of the gripping portion 11 in the plate thickness direction is smaller than the dimension of the joint portion, so that the pressing resistance of the gripping portion 11 during casting can be reduced. Since the joint portion protrudes from at least one side of the gripping portion 11 in the plate thickness direction, for example, the gripping portion 11 and the joint portion can be arranged alternately to stably stack and store the connecting member, making it easy to handle.

[0015] 6 to 8 are diagrams showing sixth to eighth examples of the connecting member of the steel sheet pile according to the embodiment of the present invention. In these examples, unlike the examples of FIGS. 1 to 5, joints are formed at both ends of the gripping part 11. In each figure, (a) shows the whole of the long connecting member, (b) shows a cross section of the connecting member gripped by the chuck part 51 of the construction machine, and (c) shows a state in which a plurality of connecting members are stacked, which is similar to the examples of FIGS. 1 to 5. FIG. 6 shows an example of a connecting member 10F in which a first joint part 12F1 is formed at one end of the gripping part 11 and a second joint part 12F2 is formed at the other end of the gripping part 11. The first joint part 12F1 and the second joint part 12F2 each consist of one joint part including a holding part. Such connecting members 10F can also be stably stacked and stored by inverting the stacked connecting members as shown in Fig. 6(c) and aligning the positions of the joint parts 12F1, 12F2 and the grip part 11. If the heights at which the joint parts 12F1, 12F2 protrude from the grip part 11 are approximately the same, the grip part 11 of the bottom connecting member can be positioned horizontally without using a spacer.

[0016] FIG. 7 shows an example of a connecting member 10G in which a first joint 12G1 is formed at one end of the gripping portion 11 and a second joint 12G2 is formed at the other end of the gripping portion 11. The first joint 12G1 includes two joints 12G1-1 and 12G1-2, and the second joint 12G2 also includes two joints 12G2-1 and 12G2-2. As shown in FIG. 7(c), the connecting member 10G can be stacked without being turned over because the joints 12G1 and 12G2 protrude on both sides in the plate thickness direction of the gripping portion 11. FIG. 8 shows an example of a connecting member 10H in which a first joint 12H1 is formed at one end of the gripping portion 11 and a second joint 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 examples of Figs. 7 and 8 may be used in a branch portion of a steel sheet pile wall as in an example described later, and joint portions for fitting the joints of the steel sheet pile may be selected according to the type of steel sheet pile or the angle of bending of the steel sheet pile wall.

[0017] The connecting member described above with reference to Figs. 6 to 8 can also be stably held by a construction machine by the flat gripping portion 11, and the pressing resistance at the gripping portion 11 during casting can be reduced. In addition, for example, by arranging the gripping portions 11 and the joint portions alternately, the connecting members can be stably stacked and stored, making them easy to handle. By forming joint portions 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 the present embodiment as described above, that is, the dimension in the depth direction at the time of casting, may be the same as or different from the steel sheet pile to be connected. Specifically, when the steel sheet pile wall is an earth retaining wall, the connecting member is not necessarily required at the embedded portion, so the connecting member may be shorter than the steel sheet pile, for example, the length of the steel sheet pile excluding the embedded portion may be a length that takes into account the influence of seepage flow such as piping due to groundwater. 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. In addition, when the required length cannot be secured due to restrictions on the transportation means or storage land, the connecting member may be longitudinally joined. For the longitudinal joint, for example, butt welding, or fillet welding using a splice plate or bolt joint can be used.

[0019] The connecting member according to the present embodiment as described above may be manufactured by integrally forming the entirety including the gripping portion and the joint portion by hot rolling, cold rolling, or hot extrusion. By integrally forming by the above-mentioned manufacturing method, even when a curved surface of a complex shape such as a recessed portion or a curved surface is formed at the joint portion, it can be easily manufactured. In addition, the connecting member may be manufactured by a 3D printer. When 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 tolerance according to the condition of the steel sheet pile at the site.

[0020] FIG. 9 is a diagram for explaining an example of the dimensions of the connecting member of the steel sheet pile according to the embodiment of the present invention. FIG. 9 shows the aspect ratio a / b of the cross section, the length L of the gripping part, the plate thickness t1 of the gripping part, and the minimum plate thickness t2 at the joint part, taking the connecting member described above with reference to FIG. 1 as an example. The aspect ratio a / b of the cross section is expressed by a being the dimension in the first direction in which the flat gripping part 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 part is and the smaller the protrusion of the joint part is, the larger the aspect ratio a / b is. Conversely, the shorter the flat part is and the larger the protrusion of the joint part is, the smaller the aspect ratio a / b is.

[0021] The aspect ratio of the cross section of the connecting member in the embodiment of the present invention is not necessarily limited, but from the viewpoint of suppressing torsional deformation occurring 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 interference when fitting the joint part of the connecting member to be driven into the ground with the joint part of the steel sheet pile driven in advance can be 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 smooth.

[0022] In addition, the length L of the gripping portion of the connecting member in the embodiment 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 is 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 pouring and removal, and stable construction can be achieved 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, the length L of the gripping portion allows the plate to be stably welded. The plate thickness t1 of the gripping part is not particularly limited as long as it is smaller than the dimension of the joint part in the plate thickness direction of the gripping part as described above, but from the viewpoint of stably transmitting the load from the construction machine while reducing the press-in resistance, it is preferably 9 mm to 20 mm, more preferably 10 mm or more. The minimum plate thickness t2 at the joint part is also not particularly limited, but it is preferably larger than the minimum plate thickness at the joint part of the steel sheet pile to be fitted. This allows the joint part of the connecting member to exhibit a higher strength than the joint part of the steel sheet pile, and makes it possible to suppress the connecting member from being detached from the steel sheet pile due to deformation.

[0023] Below, examples of steel sheet pile walls using the above-described connecting members will be described. Although each example is described as using a specific type of connecting member, it is possible to configure a similar steel sheet pile wall using 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] FIG. 10 is a diagram showing 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. The steel sheet pile 101 is a U-shaped steel sheet pile, and the steel sheet pile 102 is a hat-shaped steel sheet pile. Even if the first and second steel sheet piles connected by the connecting member 10A are different types of steel sheet piles and therefore the shapes of the joints of the respective steel sheet piles are different, for example, by appropriately designing the shape and angle of the joints of the connecting member 10A, the joints of the connecting member 10A can be fitted into the joints of the steel sheet piles 101 and 102 to construct a steel sheet pile wall. The type of steel sheet piles connected by the connecting member is not limited to hat-shaped or U-shaped, and may be Z-shaped or straight steel sheet piles, etc.

[0025] FIG. 11 is a diagram showing 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 part including the steel sheet pile 103 in the steel sheet pile wall 100B, the extension direction D2 of the part including the steel sheet piles 104 and 105, and the extension direction D3 of the part including the steel sheet pile 106 are different. That is, the connecting member 10B is arranged at the bend of the steel sheet pile wall 100B. Since the steel sheet piles are connected to each other at the bend via the connecting member 10B, it is not necessary to use a corner steel sheet pile, and it is also possible to use the same type of steel sheet piles for the steel sheet piles 103 to 106. Note that all of the steel sheet piles 103 to 106 are hat-shaped steel sheet piles, but the same configuration is also 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 large tolerance in the fitting angle when fitted to the joint portion of the steel sheet pile, for example by forming a retaining portion at the joint portion, it is possible to increase the range of angles of the bent portion that can be accommodated.

[0026] In the example of Fig. 11, the arm part of the steel sheet pile 104 and the gripping part of the connecting member 10B are in close contact with each other in plan view, and when the steel sheet pile 104 is driven first, it is difficult to hold the gripping part of the connecting member 10B and drive the steel sheet pile 104 with the same top height. In such a case, for example, the steel sheet piles 103 and 10B are driven in order from the steel sheet pile 103 side, and the connecting member 10B is driven before the steel sheet pile 104, so that the top heights of the connecting member 10B and the steel sheet pile 104 can be made the same. Alternatively, if the connecting member 10B and the steel sheet pile 104 are fitted together on the ground in advance and driven at the same time, the top heights of the connecting member 10B and the steel sheet pile 104 can be made the same regardless of the driving order of the steel sheet piles. Even if the steel sheet pile 104 is driven first, driving of the connecting member 10B is possible if the connecting member 10B is made to remain higher than the steel sheet pile 104, that is, if the upper end of the connecting member 10B is made higher than the upper end of the steel sheet pile 104, then the protruding upper end of the connecting member 10B may be cut off after driving in this manner.

[0027] 12 is a diagram showing 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, 108 is constructed using a connecting member 10C. The extension direction D4 of the part including the steel sheet pile 107 in the steel sheet pile wall 100C is about 90 degrees different from the extension direction D5 of the part including the steel sheet pile 108. The connecting member 10C has a shape optimized for connecting the steel sheet piles 107, 108 at such a corner portion without using a corner steel sheet pile.

[0028] 13 is a diagram showing 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 configured using a connecting member 10D. In the steel sheet pile wall 100D, a steel sheet pile 111 is arranged as a partition between a wall including the steel sheet piles 109 and 110 and a wall including the steel sheet piles 112 and 113, and the connecting member 10D is arranged at a branching portion between each wall and the steel sheet pile 111. More specifically, a joint portion of the steel sheet pile 109 (first steel sheet pile) is fitted into a first joint portion of the connecting member 10D, a joint portion of the steel sheet pile 110 (second steel sheet pile) is fitted into a second joint portion of the connecting member 10D, and a joint portion of the steel sheet pile 111 (third steel sheet pile) is fitted into a third joint portion of the connecting member 10D, thereby forming a branching portion. The same applies to the branching parts between the steel sheet piles 111, 112, and 113. Since the steel sheet piles are connected to each other at the branching parts via the connecting member 10D, it is not necessary to use deformed steel sheet piles, and the steel sheet piles 109 to 113 can be the same type of steel sheet piles. By using a connecting member such as the connecting member 10D, which has a large tolerance in the fitting angle when it is fitted with the joint part of the steel sheet pile by forming a substantially circular bulge part at the tip of the joint part, it is possible to absorb the positional deviation due to the dimensional error or construction error of the steel sheet pile 111 arranged as a partition wall between two wall bodies.

[0029] 14 is a diagram showing 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 configured using a connecting member 10E. In the steel sheet pile wall 100E, steel sheet piles 116 and 117 are arranged as partition walls between a wall including steel sheet piles 114 and 115 and a wall including steel sheet piles 118 and 119, and connecting members 10E are arranged at the branching parts between the respective wall bodies and the steel sheet piles 116 and 117. A branching portion is formed by fitting a joint portion of the steel sheet pile 114 (first steel sheet pile) to a first joint portion of the connecting member 10E, fitting a joint portion of the steel sheet pile 115 (second steel sheet pile) to a second joint portion of the connecting member 10E, and fitting a joint portion of the steel sheet pile 116 (third steel sheet pile) to a third joint portion of the connecting member 10E. The same applies to the branching portions between the steel sheet piles 117, 118, and 119. The connecting member 10E has four joint portions, but only three of the joint portions are used to fit with the joint portions of the steel sheet piles as in the illustrated example, and the connecting member 10E may be driven into the ground without fitting the remaining joint portions.

[0030] 15 is a diagram showing 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 a steel sheet pile 120 is formed using a connecting member 10F. The connecting member 10F is arranged at a corner of the steel sheet pile wall 100F and is fitted into the joints of the steel sheet piles 120 on both sides. As described above, since both joints of the connecting member 10F include a retaining portion, the connecting member 10F can be arranged not only at corners but also at bent portions of various angles and can connect different types of steel sheet piles.

[0031] Fig. 16 is a diagram showing 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, 122 is constructed using a connecting member 10H. The steel sheet pile 121 is a hat-shaped steel sheet pile, and the steel sheet pile 122 is a U-shaped steel sheet pile. In the connecting member 10H, two joint parts are formed on both sides of the gripping part, so that, for example, as in the example of Fig. 16, the gripping part is disposed in the wall thickness direction (direction intersecting with the extension direction of the wall body), and the shape of the wall body, specifically, the positions of the steel sheet piles 121, 122 in the wall thickness direction are adjusted by the length of the gripping part.

[0032] The method for constructing a steel sheet pile wall using the connecting member for the steel sheet pile according to the embodiment of the present invention as described above will be described below in more detail. Note that, although the connecting member 10F according to the sixth example described above is exemplified in the following description, the same configuration is also possible for the connecting members of other examples.

[0033] As already mentioned, for example, when a steel sheet pile wall as described above is constructed as a temporary structure, the steel sheet pile and the connecting member are pulled out from the ground when it is removed after the end of service. The pulled out steel sheet pile and the connecting member can be reused. For example, in the example shown in FIG. 17, the connecting member 10F is pulled out from the steel sheet pile wall 100 constructed by fitting the joint part of the connecting member 10F into the joint of the steel sheet pile 120, and is reused in another steel sheet pile wall 200. The steel sheet pile wall 200 may be constructed with the connecting member 10F by a steel sheet pile 220 different from the previous steel sheet pile wall as in the illustrated example, or the same steel sheet pile 120 as the previous steel sheet pile wall may be reused with the connecting member 10F. The steel sheet pile is gripped and pulled out by the chuck part of a construction machine such as a vibro hammer or a press-in machine in the same manner as when driving. The connecting member can also be gripped and pulled out by the chuck part of a construction machine in the same manner. In the connecting member according to the embodiment of the present invention described above, the flat gripping portion allows stable gripping by a construction machine, and allows easy extraction and reuse. The same type of construction machine can be used during extraction and casting, including reuse. When the construction machine grips the steel sheet pile or the connecting member, it is not necessarily required to grip them by a part integrally formed as the machine, and they may be gripped, for example, via a construction jig or the like. During extraction and casting, including reuse, the connecting member may be extracted or cast together with the steel sheet pile in a state in which the joint of the steel sheet pile is fitted to at least one of the joint parts. In addition, between the steel sheet piles or between the steel sheet piles and the connecting member, welding may be performed in a short section of several centimeters to several tens of centimeters to prevent the steel sheet piles from falling or rising together when other steel sheet piles are cast or extracted, but these welds can be easily removed, for example, when the steel sheet piles or the connecting member are extracted. Therefore, even if 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 grasp the gripping portion of the connecting member with a construction machine and pull it out when removing the steel sheet pile wall.

[0034] The connecting member according to the embodiment of the present invention can be easily separated from the steel sheet pile at the time of or after the extraction, unlike the connecting member which is fitted to the steel sheet pile in advance and fixed integrally by welding or the like. Therefore, the steel sheet pile after the extraction is not limited in use, and can be reused as a steel sheet pile not fitted to the connecting member. In addition, the connecting member can be used in the steel sheet pile wall after the reuse (second steel sheet pile wall) for a purpose different from that of the steel sheet pile wall before the reuse (first steel sheet pile wall). The uses of the connecting member include, as exemplified above, connecting different types of steel sheet piles, adjusting the angle at the bent part or corner part of the steel sheet pile wall, forming a branch part, adjusting the position of the steel sheet pile, etc., but the same connecting member can be reused for multiple purposes without manufacturing corner steel sheet piles or deformed steel sheet piles for each of these uses. When the connecting member is pulled out together with the steel sheet pile with the joint fitted to the joint part, the connecting member and the steel sheet pile may be separated after the extraction, or may be reused without being separated. Even when the connecting member and the steel sheet pile are reused without being separated, since the connecting member and the steel sheet pile are not fixed together, it is possible to readjust the angle between the steel sheet pile and the connecting member, for example, when reusing.

[0035] FIG. 18 is a diagram showing another example of a corner part in a steel sheet pile wall including a connecting member. As in the illustrated example, when the angle formed by the steel sheet piles 120 in the planar arrangement in which the joints of the connecting members 10F are fitted to each other in the steel sheet pile wall is θ, the angle θ in the steel sheet pile wall after reuse (second steel sheet pile wall) and the angle θ in the steel sheet pile wall before reuse (first steel sheet pile wall) may be different. For example, the angle θ is almost 90° in a similar corner part shown in FIG. 15, but the angle θ in FIG. 18 is smaller than 90°. All of these angles θ exceed the possible fitting angle of the joints between the steel sheet piles. The angle θ that the joint members can accommodate is, as a non-limiting example, -70° or more and +150° or less. As described above, the connecting member in this embodiment can be easily separated from the steel sheet pile after being pulled out. Therefore, for example, the connecting member 10F used in a corner portion of a steel sheet pile wall as in the example of Figure 15 can also be reused in a corner portion of a steel sheet pile wall at a different angle as in the example of Figure 18 after being pulled out.

[0036] FIG. 19 is a diagram showing yet another example of a corner in a steel sheet pile wall including a connecting member. As in the illustrated example, when the 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 the steel sheet pile 124 and the steel sheet pile 124 and to adjust the position of the steel sheet pile 123 in the wall thickness direction. In this way, the use of the connecting member in this embodiment is not limited to one, and the same connecting member may be used for multiple uses, and in the above example, for angle adjustment and position adjustment. For example, the steel sheet pile walls in FIG. 15, FIG. 18, and FIG. 19 described above can 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 position deviation caused by the driving of the steel sheet piles can be adjusted by the connecting member to close the corner.

[0037] FIG. 20 is a diagram for explaining the internal space of the joint in the connecting member. As described above, for example, by forming a retaining portion (example of FIG. 2) or a bulging portion (example of FIG. 4), the tolerance of the fitting angle when fitting the joint of the steel sheet pile to the joint of the connecting member can be made larger than the tolerance of the fitting angle when fitting the joints of the steel sheet piles to each other. 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 of the connecting member (exemplified as the joint 12F2 of the connecting member 10F) is larger than the internal space S2 of the joint of the steel sheet pile (exemplified as the joint 1201 of the steel sheet pile 120). As a non-limiting example, the internal space S1 is 1.5 times or more and less than 2 times the internal space S2 in terms of cross-sectional area. This not only allows for a larger tolerance in the fitting angle as described above, but also allows the joint to be fitted at an angle with a margin relative to the geometric maximum value of the fitting angle for which the margin is provided, so that the joint is less likely to deform even if the relative angle with the steel sheet pile changes, for example, during driving or pulling out.

[0038] When the connecting member is reused, a procedure for maintaining the function of the joint as described above may be carried out. Specifically, the dimensions of the internal space of the joint in the connecting member after extraction may be measured, and the joint may be corrected using a press or a jack according to the measurement results to ensure the size and verticality of the internal space. In the measurement, for example, a vernier caliper or a sample mold of the joint of the steel sheet pile is used to confirm that there are no problems with the opening width, bending, twisting, warping, etc. in the fit. 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 so that it can be smoothly fitted with the joint of the steel sheet pile when reused.

[0039] FIG. 21 is a diagram for explaining an example of the driving depth of the connecting member. As in the illustrated example, the driving depth d1 of the connecting member 10F may be shallower than the driving depth d2 of the steel sheet pile 120 in which the joint of the connecting member 10F is fitted. The steel sheet pile wall is constructed to resist earth pressure and water pressure, but the length of the connecting member in the extension direction of the wall is smaller than that of the steel sheet pile, so that if the driving depth of the steel sheet pile 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 shallow, the overall length of the connecting member can be reduced. In addition, since the connecting member does not necessarily have to be driven at the same driving depth as the steel sheet pile, the same connecting member can be reused in a steel sheet pile wall having a different driving depth of the steel sheet pile. No problem occurs if the driving depth of the connecting member is the same as or deeper than the driving depth of the steel sheet pile, so for example, if the connecting member prepared for reuse is longer than the steel sheet pile, the driving depth of the connecting member may be deeper than the driving depth of the steel sheet pile.

[0040] FIG. 22 is a diagram for explaining an example of disposing a water-stopping material in a joint of a connecting member. In the illustrated example, a water-stopping material W is disposed in a joint of a connecting member (exemplified as a joint 12F1 of a connecting member 10F) into which a joint of a steel sheet pile (exemplified as a joint 1201 of a steel sheet pile 120) is fitted. The water-stopping material may be applied or filled in an internal space of the joint in a connecting member after extraction and before reuse, for example. Alternatively, the water-stopping material may be filled in an internal space of the joint in a connecting member after casting. For example, a water-absorbent polymer or a urethane-based material may be used as the applied water-stopping material, and a bentonite-based or cement-based material may be used as the filled water-stopping material. By disposing the water-stopping material in the joint of a connecting member, it is possible to perform reliable water-stopping treatment while reducing the amount of water-stopping material used. [Explanation of symbols]

[0041] 10A to 10H...connecting member, 11...gripping portion, 12A to 12E...joint portion, 12F1 to 12H1...first joint portion, 12F2 to 12H2...second joint portion, 51...chuck portion, 100A to 100H...steel sheet pile wall, 101 to 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 in cross-sectional shape and first and second joint portions formed at ends of the gripping portion, At the corner portion of the steel sheet pile wall, the connecting member connects the steel sheet piles at an angle exceeding an interfittable angle of the joint of the steel sheet pile in a planar arrangement, A construction method for a steel sheet pile wall, wherein the connecting members are driven into the corner portions after the steel sheet piles.

2. A method for constructing a steel sheet pile wall using a connecting member having a flat gripping portion in a cross-sectional shape and first and second joint portions formed at ends of the gripping portion, a step of pulling out the connecting member from a first steel sheet pile wall constructed by fitting the first and second joint portions to the joints of the steel sheet piles, by gripping the gripping portion with a construction machine; Reusing the connecting member in constructing a second steel sheet pile wall. A method for constructing steel sheet pile walls, including:

3. The steel sheet pile wall construction method according to claim 2 , wherein in the step of reusing the connecting member, the connecting member is driven by gripping the gripping portion with a construction machine of the same type as that in the step of pulling out the connecting member.

4. The construction method of a steel sheet pile wall as described in claim 2, wherein an angle formed by the steel sheet piles in a planar arrangement in which joints are fitted into the first and second joint portions in the second steel sheet pile wall is different from an angle formed by the steel sheet piles in a planar arrangement in which joints are fitted into the first and second joint portions in the first steel sheet pile wall.

5. In the cross-sectional shape, an internal space of the first and second joint portions is larger than an internal space of the joint of the steel sheet pile, measuring dimensions of internal spaces of the first and second joint portions in the connecting member after the connecting member has been pulled out; correcting the first and second joint portions according to the results of the measurement; The steel sheet pile wall construction method according to claim 2, further comprising:

6. 3. The steel sheet pile wall construction method according to claim 2, further comprising the step of applying or filling a water-stopping material into internal spaces of the first and second joint portions of the connecting member after extraction and before reuse.

7. The steel sheet pile wall construction method according to claim 2 , further comprising the step of filling an internal space of the first and second joint portions of the connecting member after casting in reuse with a water-stopping material.

8. The steel sheet pile wall construction method according to claim 2, wherein in the step of pulling out the connecting member, the connecting member is pulled out together with the steel sheet pile in a state in which the joint of the steel sheet pile is engaged with at least one of the first or second joint portion.

9. A construction method for a steel sheet pile wall as described in claim 2, wherein in the process of reusing the connecting member, the connecting member is driven together with the steel sheet pile with the joint of the steel sheet pile engaged with at least one of the first or second joint portion.

10. 3. A steel sheet pile wall construction method according to claim 1, wherein the installation depth of the connecting member is shallower than the installation depth of each of the steel sheet piles whose joints are fitted to the first and second joint portions.

11. A method for constructing a steel sheet pile wall using a connecting member having a flat plate-shaped gripping portion in a cross-sectional shape and first and second joint portions formed at ends of the gripping portion, At the corner portion of the steel sheet pile wall, the connecting member connects the steel sheet piles at an angle exceeding an interfittable angle of the joint of the steel sheet pile in a planar arrangement, A construction method for a steel sheet pile wall, wherein the installation depth of the connecting member is shallower than the installation depth of each of the steel sheet piles whose joints are fitted into the first and second joint portions.

12. The steel sheet pile wall construction method according to claim 1 , claim 2 or claim 11 , wherein the connecting member further has a third joint portion formed at an end of the gripping portion.

13. The steel sheet pile wall construction method according to claim 12 , wherein the connecting member further has a fourth joint portion formed at an end of the gripping portion.

14. A steel sheet pile wall using a connecting member having a flat gripping portion in a cross-sectional shape and first and second joint portions formed at ends of the gripping portion, At the corner portion of the steel sheet pile wall, the connecting member connects the steel sheet piles at an angle exceeding an interfittable angle of the joint of the steel sheet pile in a planar arrangement, A steel sheet pile wall, wherein the installation depth of the connecting member is shallower than the installation depth of each of the steel sheet piles whose joints are fitted to the first and second joint portions.

15. A steel sheet pile wall using a connecting member having a flat gripping portion in a cross-sectional shape and first and second joint portions formed at ends of the gripping portion, The first and second joint portions are fitted to joints of the steel sheet piles, respectively, to construct the steel sheet pile wall; The connecting member is installed so that the gripping portion can be gripped and pulled out by a construction machine, A steel sheet pile wall, wherein the installation depth of the connecting member is shallower than the installation depth of each of the steel sheet piles whose joints are fitted to the first and second joint portions.

16. The steel sheet pile wall according to claim 14 or 15, wherein an internal space of the first and second joint parts is coated with or filled with a water-stopping material.

17. The steel sheet pile wall according to claim 14 or 15, wherein the connecting member further has a third joint portion formed at an end of the gripping portion.

18. The steel sheet pile wall according to claim 17 , wherein the connecting member further has a fourth joint portion formed at an end of the gripping portion.

Images