Yaita

Abstract

To provide sheet piles that can suppress the removal of soil and sand during extraction. [Solution] The sheet pile 100 comprises a main body portion 10 and an outer covering portion 20 that covers the surface of the main body portion 10 and can be separated from the main body portion 10 and remain in the ground E when the main body portion 10 is pulled out from the ground E. The outer covering portion 20 has an outer covering main body portion 21 that covers at least a part of the surface of the main body portion 10 and an outer inverted portion 22 that is connected to the outer covering main body portion 21 and extends in a direction intersecting upward Z1 to lock into the ground E.

Description

Technical Field

[0001] The present invention relates to sheet piles used in excavation work.

Background Art

[0002] Conventionally, when performing excavation work using the sheet pile method, sheet piles are driven for the purpose of retaining soil in the excavation area. In the excavation method described in Patent Document 1, a plurality of sheet piles are driven adjacent to each other substantially vertically to a predetermined depth in the soil to install a sheet pile wall surrounding the excavation work surface, and after the excavation work, the sheet piles are removed from the soil. In this excavation method, when driving each sheet pile, a synthetic resin sheet is used so as to cover both surfaces of each sheet pile from the lower end of each sheet pile to at least the work surface.

[0003] According to the sheet pile described in Patent Document 1, since the sheet pile is driven into the soil with the synthetic resin sheets in contact with both the front and back surfaces, the synthetic resin sheet is interposed between the sheet pile and the earth and sand, and the adhesion of the earth and sand to the sheet pile surface can be reduced. That is, since only the sheet pile is pulled out and the synthetic resin sheet remains in the soil, the sheet pile can be pulled out with almost no earth and sand adhering thereto. Finally, it is said that the formation of a cavity in the soil can be prevented when the sheet pile is pulled out.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the sheet pile described in Patent Document 1, since the synthetic resin sheet covering the sheet pile is in close contact with both the front and back surfaces of the sheet pile body, there is a concern that when the sheet pile body is pulled out, the synthetic resin sheet will be pulled out of the ground together with the sheet pile body. Therefore, the synthetic resin sheet cannot be left in the ground, and there is a risk that the soil attached to the synthetic resin sheet will be carried away from the ground along with the synthetic resin sheet.

[0006] Therefore, the present invention aims to provide a sheet pile that can suppress the removal of soil and sand during extraction. [Means for solving the problem]

[0007] The sheet pile of the present invention comprises a main body and a covering portion that covers the surface of the main body and can be separated from the main body and remain in the ground when the main body is pulled out of the ground, the covering portion having a covering main body portion that covers at least a part of the surface of the main body and a reverse portion connected to the covering main body portion and extending in a direction intersecting the pulling direction when the sheet pile is pulled out to lock into the ground.

[0008] With this configuration, the covering portion is connected to the covering body and has a retractable portion that extends in a direction intersecting the pulling direction when the covering is pulled out, for locking into the ground. Therefore, when the body is pulled out of the ground, the retractable portion receives a restraining force from the soil in the ground in the opposite direction to the pulling direction. Consequently, even if the body is pulled out of the ground, the covering portion remains in the ground because the retractable portion receives a restraining force. This makes it possible to pull out only the body from the ground without removing the soil.

[0009] Furthermore, the covering body and the reversed portion can be connected so as to be able to move closer to and further away from the surface in the direction of contact and separation.

[0010] With this configuration, the covering body and the retractable portion are connected so that they can approach and separate from the surface in the direction of contact and separation. When driving a sheet pile into the ground, the retractable portion is pressed toward the covering body by the soil, causing the covering body and the retractable portion to approach each other. Because the covering body and the retractable portion approach each other, the resistance to penetration into the ground can be reduced, making it easier to drive sheet piles. Furthermore, when the body is pulled out of the ground, soil enters between the covering body and the retractable portion as the body moves, causing the covering body and the retractable portion to separate. Because the covering body and the retractable portion separate, the projection area of ​​the retractable portion toward the plane perpendicular to the pulling direction increases, and the restraining force of the covering portion in the ground can be increased.

[0011] Furthermore, the covering body and the reversed portion can be connected by a hinge so that they can move closer to and further away from the surface in the direction of contact and separation.

[0012] With this configuration, the covering body and the retractable part are connected by a hinge, allowing for smooth movement towards and away from each other.

[0013] Furthermore, the reverse portion has a first portion located in the pulling direction and a second portion located in the driving direction, which is in the opposite direction to the pulling direction than the first portion, and the intersection angle of the first portion with respect to the pulling direction can be set to be greater than the intersection angle of the second portion with respect to the pulling direction.

[0014] With this configuration, when driving the sheet pile into the ground, the second section, which has a smaller intersection angle than the first section, advances into the ground ahead of the first section, thus reducing the resistance to penetration into the ground. Furthermore, when withdrawing the main body from the ground, the first section, which has a larger intersection angle than the second section, extends in a direction intersecting the withdrawal direction and locks into the ground, allowing the covering section to remain in the ground.

[0015] Furthermore, the main body and the covering body can be connected via an adhesive that softens upon contact with liquid.

[0016] According to such a configuration, when pulling out the main body part from the ground, by attaching a liquid to the adhesive, the main body part can be slid with respect to the covered main body part. Thereby, when driving the sheet pile into the ground, while maintaining a high adhesiveness between the main body part and the covered main body part, when pulling out the main body part from the ground, the separability between the main body part and the covered main body part can be increased using the liquid.

Effect of the Invention

[0017] According to the present invention, it is possible to provide a sheet pile that can avoid the removal of earth and sand accompanying the pulling out.

Brief Description of the Drawings

[0018] [Figure 1] It is a plan view showing the installation state of the sheet pile according to an embodiment of the present invention. [Figure 2] It is a plan view of the sheet pile. [Figure 3] It is an exploded perspective view of the sheet pile. [Figure 4] It is a view showing a part of the longitudinal section of the sheet pile at the time of driving. [Figure 5] It is a view showing a part of the longitudinal section of the sheet pile at the time of pulling out. [Figure 6] It is a view showing a part of the longitudinal section of the sheet pile according to a modified example.

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of the sheet pile according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and the description will not be repeated.

[0020] Referring to FIGS. 1 to 3, a sheet pile 100 according to an embodiment of the present invention will be described. FIG. 1 is a plan view showing an installation state of the sheet pile 100 according to an embodiment of the present invention. FIG. 2 is a plan view of the sheet pile 100. FIG. 3 is an exploded perspective view of the sheet pile 100. The sheet pile 100 is, for example, a hat-shaped steel sheet pile. The sheet pile 100 is used for earth retaining walls, foundation structures, bank protection of coastal rivers, quay walls, cut-off walls, etc. in the field of civil engineering and construction. As shown in FIG. 1, the sheet pile 100 is driven into the ground E and is connected to a plurality of other sheet piles 100 to form a steel sheet pile wall 1 (earth retaining wall). The sheet pile 100 is formed of a steel plate member having a concave groove. The steel sheet pile wall 1 has a concave groove arranged only on one side.

[0021] As shown in FIGS. 2 and 3, the sheet pile 100 includes a main body portion 10, an outer covering portion 20, an inner covering portion 30, and an adhesive 40.

[0022] The main body portion 10 suppresses the collapse of earth and sand in a state of being disposed in the ground E (see FIG. 1) and is pulled out from the ground E after the completion of the construction. The main body portion 10 has a web 11, a pair of flanges 12, a pair of arms 13, a first joint 131, and a second joint 132.

[0023] Hereinafter, for the convenience of explanation, the direction from the second joint 132 to the first joint 131 is defined as the leftward direction X1, the opposite direction thereof is defined as the rightward direction X2, and the left-right direction is described as the left-right direction X. Further, the direction in which the concave groove of the sheet pile 100 faces is defined as the rearward direction Y2, the opposite direction thereof is defined as the forward direction Y1, and the front-rear direction is described as the front-rear direction Y. Furthermore, the pulling direction in which the sheet pile 100 is pulled out is defined as the upward direction Z1, the driving direction which is the opposite direction thereof is defined as the downward direction Z2, and the up-down direction is described as the up-down direction Z. Although the sheet pile 100 driven in the downward direction Z2 and pulled out in the upward direction Z1 will be described as an example, the sheet pile 100 is not limited to being used in a construction method of being driven in the downward direction Z2 and pulled out in the upward direction Z1.

[0024] As shown in Figures 2 and 3, the web 11 and the pair of flanges 12 form a roughly U-shaped structure. Both the web 11 and the pair of flanges 12 are roughly rectangular plate materials. The right end of the left flange 12 is connected to the left end of the web 11. The left flange 12 is located Y2 further back than X1 to the left. The left end of the right flange 12 is connected to the right end of the web 11. The right flange 12 is located Y2 further back than X2 to the right.

[0025] The left arm 13 has its right end connected to the left end of the left flange 12. The left arm 13 is a roughly rectangular plate. The left arm 13 extends to the left X1. The left arm 13 has a first joint 131 at its left end.

[0026] The first joint 131 is formed in a hook shape that opens forward Y1. The first joint 131 is connected to the second joint 132 of the adjacent sheet pile 100 to the left X1 by engaging with it from the vertical direction Z (upper Z1) using a dedicated press-fitting machine (not shown).

[0027] The right arm 13 has its left end connected to the right end of the right flange 12. The right arm 13 is a roughly rectangular plate. The right arm 13 extends to the right X2. The right arm 13 has a second joint 132 at its right end.

[0028] The second joint 132 is formed in a hook shape that opens to the rear Y2. The second joint 132 is connected to the first joint 131 of the adjacent sheet pile 100 to the right X2 by engaging with it from the vertical direction Z (upwards Z1) using a press-in machine. This constitutes a steel sheet pile wall 1 that extends in the left-right direction X and the vertical direction Z.

[0029] The outer covering portion 20 and the inner covering portion 30 cover the front and rear surfaces, respectively, which correspond to the front and back surfaces of the main body portion 10. The outer covering portion 20 and the inner covering portion 30 are configured to separate from the main body portion 10 and remain in the ground E (see Figure 1) when the main body portion 10 is pulled upward Z1 from the ground E. The outer covering portion 20 and the inner covering portion 30 correspond to, for example, the "covering portion".

[0030] The outer covering portion 20 will be described with reference to Figures 2 to 5. Figure 4 shows a part of the longitudinal cross-section of the sheet pile 100 when it is driven in. Figure 5 shows a part of the longitudinal cross-section of the sheet pile 100 when it is pulled out. As shown in Figures 2 to 5, the outer covering portion 20 has an outer covering main body portion 21, an outer inverted portion 22, and an outer hinge 23.

[0031] The outer covering body portion 21 covers at least a portion of the front surface Y1 of the main body portion 10. In this embodiment, the outer covering body portion 21 covers the entire front surface Y1 of the main body portion 10. The outer covering body portion 21 has an outer covering web 211, a pair of outer covering flanges 212, and a pair of outer covering arms 213. The outer covering web 211 covers the portion corresponding to the web 11, the pair of outer covering flanges 212 cover the portion corresponding to the pair of flanges 12, and the pair of outer covering arms 213 cover the portion corresponding to the pair of arms 13. Specifically, the outer covering body portion 21 covers the entire front surface Y1 of the main body portion 10, excluding the first joint 131 and the second joint 132. The outer covering body portion 21 is attached to the front surface Y1 of the main body portion 10 by adhesive 40.

[0032] Adhesive 40 is an adhesive that softens upon contact with liquid. Specifically, adhesive 40 is a solution-based adhesive that uses alcohol or water as a solvent. For ease of understanding, in Figure 3, adhesive 40 is shown as the adhesive layer.

[0033] In this embodiment, the adhesive 40 is a starch paste, which is a type of water-soluble adhesive. The main body 10 and the outer covering main body 21 are connected via the adhesive 40, which can be softened by the application of liquid. This ensures the connection strength between the main body 10 and the outer covering 20 when driving the sheet piles 100, while reducing the connection strength between the main body 10 and the outer covering 20 when the sheet piles 100 are removed after the completion of the work, by using the moisture in the soil. In other words, when a water-soluble adhesive is used, the adhesive 40 acts as a lubricant when the main body 10 is removed. If the reduction in the connection strength between the main body 10 and the outer covering 20 is insufficient, it is possible to improve the separation between the main body 10 and the outer covering main body 21 by separately pouring water onto the adhesive 40 from the ground.

[0034] The outer inverted portion 22 secures the outer covering portion 20 in the ground E (see Figure 1). The outer inverted portion 22 is connected to the outer covering main body portion 21 and extends in a direction intersecting the upward Z1 direction, which is the pulling direction, and is locked to the ground. The outer covering main body portion 21 and the outer inverted portion 22 are connected so that they can approach and separate in the front-rear direction Y, which corresponds to the approach-separation direction.

[0035] The outer inverted portion 22 is connected to the outer covering body portion 21 in the downward Z2 direction, which is the direction of insertion, via the outer hinge 23. Specifically, the outer inverted portion 22 is connected to the downward Z2 end of the outer covering body portion 21 via the outer hinge 23. The outer covering body portion 21 and the outer inverted portion 22 are connected by the outer hinge 23 so that they can be moved closer together and further apart.

[0036] The outer hinges 23 corresponding to the web 11 and the pair of arms 13 rotate around an axis extending along the left-right direction X. The outer hinges 23 corresponding to the pair of flanges 12 rotate around an axis extending along the lower end of the flanges 12.

[0037] The outer inverted portion 22 has an outer covering body portion 21 interposed between it and the main body portion 10. The outer inverted portion 22 has an outer first portion 221 and an outer second portion 222.

[0038] The outer first portion 221 is located above Z1 of the outer inverted portion 22. The boundary between the outer first portion 221 and the outer second portion 222 may be a bent portion or a curved portion. When the sheet pile 100 is driven in, the outer first portion 221 extends upward Z1 from the upper end of the outer second portion 222. The outer first portion 221 intersects the upward Z1, which is the withdrawal direction, at an intersection angle θ1. The intersection angle θ1 when the sheet pile 100 is driven in is smaller than the intersection angle θ1 when the main body portion 10 is withdrawn.

[0039] The outer second portion 222 is located below the outer first portion 221 in the driving direction Z2 when the sheet pile 100 is driven in. The lower end of the outer second portion 222 is connected to the lower end of the outer covering body 21 via the outer hinge 23. The outer second portion 222 intersects the upward Z1 direction, which is the withdrawal direction, at an intersection angle θ2. When driven in, the outer second portion 222 is in contact with the outer covering body 21, or is closest to the outer covering body 21. The intersection angle θ2 when the sheet pile 100 is driven in is smaller than the intersection angle θ2 when the body 10 is withdrawn.

[0040] The outer hinge 23 is configured so that the intersection angle θ2 varies from 0° to 90°. The outer hinge 23 is restricted so that the intersection angle θ2 does not exceed 90°.

[0041] Furthermore, the intersection angle θ1 is set to be larger than the intersection angle θ2. As a result, when the main body 10 is initially pulled out, the outer covering portion 20 moves slightly upward in synchronization with the main body 10, and the soil in the ground E (see Figure 1) presses the outer first portion 221 downward Z2. As the soil presses the outer first portion 221 downward Z2, the outer hinge 23 opens, and the intersection angle θ2 increases. The soil located above the outer first portion 221 Z1 enters the gap between the outer second portion 222 and the outer covering main body 21 as the main body 10 rises. As the soil enters the gap between the outer second portion 222 and the outer covering main body 21, the intersection angle θ2 is further expanded, and the amount of soil entering the gap increases. As a result, the outer covering main body 21 and the outer inverted portion 22 separate.

[0042] The inner covering portion 30 will be described with reference to Figures 2 and 3. As shown in Figures 2 and 3, the inner covering portion 30 has an inner covering body portion 31, an inner inverted portion 32, and an inner hinge 33.

[0043] The inner covering body 31 covers at least a portion of the surface of the rear Y2 of the main body 10. In this embodiment, the inner covering body 31 covers the entire surface of the rear Y2 of the main body 10. The inner covering body 31 has an inner covering web 311, a pair of inner covering flanges 312, and a pair of inner covering arms 313. The inner covering web 311 covers the portion corresponding to the web 11, the pair of inner covering flanges 312 cover the portions corresponding to the pair of flanges 12, and the pair of inner covering arms 313 cover the portions corresponding to the pair of arms 13. Specifically, the inner covering body 31 covers the entire surface of the rear Y2 of the main body 10, excluding the first joint 131 and the second joint 132. The inner covering body 31 is attached to the surface of the rear Y2 of the main body 10 by adhesive 40.

[0044] The inner inverted portion 32 secures the inner covering portion 30 in the ground E (see Figure 1). The inner inverted portion 32 is connected to the inner covering main body portion 31 and extends in a direction intersecting upward Z1, locking into the ground E. The inner covering main body portion 31 and the inner inverted portion 32 are connected so that they can move closer to and further apart in the front-rear direction Y. Specifically, they are connected by an inner hinge 33.

[0045] The internal hinges 33 corresponding to the web 11 and the pair of arms 13 rotate around an axis extending along the left-right direction X. The internal hinges 33 corresponding to the pair of flanges 12 rotate around an axis extending along the lower end of the flanges 12.

[0046] The inner inverted portion 32 has an inner covering body portion 31 interposed between it and the web 11. The inner inverted portion 32 has an inner first portion 321 and an inner second portion 322. The inner covering portion 30 is substantially symmetrical with respect to the outer covering portion 20 and the main body portion 10. Furthermore, the inner first portion 321 and the inner second portion 322 have substantially the same configuration as the outer first portion 221 and the outer second portion 222, except for the rotational direction.

[0047] With the above configuration, the outer covering portion 20 is connected to the outer covering main body portion 21 and has an outer inverted portion 22 that extends in a direction intersecting upward Z1 and locks into the ground E. Therefore, when the main body portion 10 is pulled out of the ground E, the outer inverted portion 22 receives a restraining force directed downward Z2 from the soil in the ground E. Consequently, even if the main body portion 10 is pulled out of the ground E, the outer inverted portion 22 receives a restraining force, and the outer covering portion 20 remains in the ground E. This makes it possible to pull out only the main body portion 10 from the ground without taking away the soil.

[0048] Furthermore, the outer covering body portion 21 and the outer inverted portion 22 can be connected so as to be able to move closer to and further away from the surface of the main body portion 10 in the front-rear direction Y. With the above configuration, when the sheet pile 100 is driven into the ground E, the outer inverted portion 22 is pressed toward the outer covering body portion 21 by the soil, causing the outer covering body portion 21 and the outer inverted portion 22 to move closer together. Because the outer covering body portion 21 and the outer inverted portion 22 move closer together, the resistance to penetration into the ground E can be reduced, making it easier to drive the sheet pile 100. Also, when the main body portion 10 is withdrawn from the ground E, soil enters between the outer covering body portion 21 and the outer inverted portion 22 as the main body portion 10 moves, causing the outer covering body portion 21 and the outer inverted portion 22 to move apart. Because the outer covering body portion 21 and the outer inverted portion 22 are separated, the projection area of ​​the outer inverted portion 22 with respect to the upper Z1 increases, and the restraining force of the outer covering portion 20 in the ground E can be increased.

[0049] Furthermore, the outer covering body portion 21 and the outer inverted portion 22 can be connected by an outer hinge 23 so that they can move closer to and further away from the surface of the main body portion 10 in the front-rear direction Y. With the above configuration, movement between the two can be performed smoothly.

[0050] Furthermore, the outer inverted portion 22 has a first portion 221 located on the upper Z1 side and a second portion 222 located lower Z2 than the first portion 221, and the intersection angle θ1 of the first portion 221 is set to be greater than the intersection angle θ2 of the second portion 222. With the above configuration, when driving the sheet pile 100 into the ground E, the second portion 222, which has a smaller intersection angle than the first portion 221, advances into the ground E ahead of the first portion 221, thus reducing the resistance to penetration into the ground E. Also, when withdrawing the main body portion 10 from the ground E, the first portion 221, which has a larger intersection angle than the second portion 222, extends in a direction intersecting upward Z1 and locks into the ground E, so the outer covering portion 20 can be left in the ground E.

[0051] Furthermore, the main body portion 10 and the outer covering main body portion 21 can also be connected via an adhesive 40 that softens upon contact with liquid. With this configuration, when the main body portion 10 is withdrawn from the ground E, the liquid is applied to the adhesive 40, allowing the main body portion 10 to slide against the outer covering main body portion 21. This allows for high adhesion between the main body portion 10 and the outer covering main body portion 21 when driving the sheet pile 100 into the ground E, while simultaneously improving the separability between the main body portion 10 and the outer covering main body portion 21 by supplying liquid to the adhesive 40 when withdrawing the main body portion 10 from the ground E.

[0052] Furthermore, since the inner covering portion 30 has the same configuration as the outer covering portion 20, it provides the same function and effect as the outer covering portion 20.

[0053] Embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention. The drawings sometimes schematically show the components in order to facilitate understanding. The number of each component shown in the drawings may differ from the actual number due to the convenience of drawing creation. Furthermore, the components shown in the above embodiments are examples and are not particularly limiting, and various modifications are possible without substantially departing from the effects of the present invention.

[0054] (1) In this embodiment, the sheet pile 100 was a hat-shaped steel sheet pile, but the disclosure is not limited thereto. The sheet pile 100 may be a U-shaped steel sheet pile or a straight steel sheet pile. Furthermore, the sheet pile 100 is not limited to a steel sheet pile. The material of the sheet pile 100 may be concrete, wood, or synthetic resin.

[0055] (2) In this embodiment, the sheet pile 100 had an outer covering portion 20 and an inner covering portion 30, but the disclosure is not limited thereto. The covering portion may be provided on at least one side of the main body portion 10. Preferably, the covering portion can be provided only on the side of the main body portion 10 where soil is present.

[0056] (3) In this embodiment, the outer covering body portion 21 (inner covering body portion 31) covers the entire area of ​​one side surface of the main body portion 10 in the front-rear direction Y, but the disclosure is not limited thereto. The outer covering body portion 21 (inner covering body portion 31) may cover only a part of one side surface, for example, only the area located in the ground E at the end of driving. The outer covering body portion 21 (inner covering body portion 31) may also have a plurality of openings. The plurality of openings supply moisture from the ground E to the adhesive 40. This allows sufficient moisture to adhere to the adhesive 40, and allows the main body portion 10 to slide sufficiently against the outer covering body portion 21.

[0057] To ensure sufficient moisture adheres to the adhesive 40, moisture supply sections may be formed in the adhesive 40. For example, vertical grooves extending in the vertical direction Z can be formed in the adhesive layer of the adhesive 40 as moisture supply sections. When multiple vertical grooves extending in the vertical direction Z are provided, the moisture supply efficiency can be increased by forming horizontal grooves that connect the multiple vertical grooves in the horizontal direction.

[0058] (4) In this embodiment, the outer inverted portion 22 (inner inverted portion 32) was connected to the lower end of the outer covering body portion 21 (inner covering body portion 31), but the disclosure is not limited thereto. The outer inverted portion 22 may also be connected to the middle portion of the outer covering body portion 21.

[0059] (5) In this embodiment, the outer inverted portion 22 (inner inverted portion 32) was connected to the outer covering body portion 21 (inner covering body portion 31) via a hinge, but the disclosure is not limited thereto. The outer inverted portion 22 may be connected to the outer covering body portion 21 via a pivot mechanism. The pivot mechanism may be configured to be rotatable by making the boundary between the outer inverted portion 22 and the outer covering body portion 21 thinner than the other parts.

[0060] (6) In this embodiment, the outer inverted portion 22 (inner inverted portion 32) was movable relative to the outer covering body portion 21 (inner covering body portion 31), but the disclosure is not limited thereto. As shown in Figure 6, the outer inverted portion 22A may be fixed immovably relative to the outer covering body portion 21. The differences from the embodiments described above will be explained below, and the descriptions of other embodiments will be referenced.

[0061] The sheet pile 100 has a main body 10, an outer covering portion 20A, and an adhesive 40. The outer covering portion 20A has an outer covering main body 21 and an outer overhang portion 22A. The outer covering main body 21 and the outer overhang portion 22A are integrally formed from, for example, synthetic resin.

[0062] The outer inverted portion 22A is positioned at the lower end of the outer covering main body portion 21. The outer inverted portion 22A is configured with a hook-shaped cross-section such that the surface of the front Y1 is further away from the main body portion 10 as the upper Z1 increases. The outer inverted portion 22A also has a surface that intersects with the upper Z1. This reduces the penetration resistance into the ground E when driving the sheet pile 100 into the ground E, making it easier to drive the sheet pile 100A. Furthermore, when withdrawing the main body portion 10 from the ground E, the surface of the outer inverted portion 22A that intersects with the upper Z1 receives a restraining force directed downward Z2 from the soil in the ground E. [Explanation of Symbols]

[0063] 1...Steel sheet pile wall, 10...Main body, 11...Web, 12...Flange, 13...Arm, 20, 20A...Outer covering part, 21...Outer covering main body, 22, 22A...Outer inverted part, 23...Outer hinge, 30...Inner covering part, 31...Inner covering main body, 32...Inner inverted part, 33...Inner hinge, 40...Adhesive, 100, 100A...Sheet pile, 221...Outer first part, 222...Outer second part, 321...Inner first part, 322...Inner second part, E...Ground, θ1...Intersection angle, θ2...Intersection angle

Claims

1. The main body and The covering portion covers the surface of the main body and, when the main body is pulled out of the ground, can be separated from the main body and remain in the ground. Equipped with, The aforementioned covering portion is A covering body portion that covers at least a part of the surface of the main body portion, A reverse portion is connected to the main body of the covering and extends in a direction intersecting the pulling direction when the covering is removed, for securing to the ground. A sheet pile having

2. The sheet pile according to claim 1, wherein the covering body and the inverted portion are connected so as to be able to approach and separate from the surface in the direction of contact and separation.

3. The sheet pile according to claim 2, wherein the covering body and the reversed portion are connected by a hinge so as to be able to move toward and away from the surface in the direction of adjacency and separation.

4. The aforementioned inverted portion is, The first portion located in the aforementioned pulling direction, A second portion located in the driving direction, which is in the opposite direction to the pulling direction compared to the first portion, It has, The sheet pile according to any one of claims 1 to 3, wherein the intersection angle of the first portion with respect to the pulling direction is set to be greater than the intersection angle of the second portion with respect to the pulling direction.

5. The sheet pile according to claim 1 or claim 2, wherein the main body and the covering main body are connected via an adhesive that softens upon contact with a liquid.

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