Soil removal device and soil removal method for steel pipe sheet pile well foundations

Abstract

To makes it possible to easily and reliably remove dirt when constructing a steel pipe sheet pile well foundation without using a special-shaped dirt removing device.SOLUTION: A dirt removing device for a steel pipe sheet pile well foundation has a vertically penetrating pipe insertion hole 50 provided at a steel pipe sheet pile 10 side from a wale 20 of a timbering installed on the inner peripheral surface of a well (steel pipe sheet pile 10), a high pressure water injection pipe 60 that is inserted in the pipe insertion hole 50 and injects high pressure water toward the inner peripheral surface of the well (steel pipe sheet pile 10), and a high pressure water supply device 90 that supplies the high pressure water to the high pressure water injection pipe 60. The high pressure water injection pipe 60 has multiple high pressure water injection holes 70 provided at a tip thereof with equal intervals in the circumferential direction. Each of the high pressure water injection holes 70 has at least an opening 70b in the lateral direction and an opening 70c in the obliquely upward direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a soil removal device and soil removal method for steel pipe sheet pile shaft foundations, and more particularly to a device and method for effectively and reliably removing soil removers present at the joints of steel pipe sheet piles when constructing a shaft foundation using steel pipe sheet piles. [Background technology]

[0002] To construct underwater structures such as marine structures, steel pipe sheet piles are driven into the underwater ground to form a steel pipe sheet pile well, and the soil inside the well is then removed by excavating it using an excavating machine such as a clamshell.

[0003] To construct a well foundation, the soil inside the well must be removed. However, using an excavation machine such as a clamshell alone is not enough to remove the soil (soil spatula) present on the inner periphery of the steel pipe sheet pile, particularly at the joints of the steel pipe sheet pile. Therefore, various techniques have been developed to remove the soil (soil spatula) present on the inner periphery of the steel pipe sheet pile, particularly at the joints of the steel pipe sheet pile (see Patent Documents 1 to 4). In the following description, the soil present at the joints of the steel pipe sheet pile will be referred to as a "soil spatula" (soil spatula) using katakana, and the tool used to remove the soil will be referred to as a "spatula" (spatula) using hiragana, to distinguish between the two.

[0004] The technology described in Patent Document 1 relates to a jig for removing soil from an area surrounded by a steel pipe sheet pile and a steel pipe joint. This soil removal jig includes a main body consisting of a vertical member and a diagonal member connected near the lower end of the vertical member so as to be inclined toward the soil remover, an adjustable weight attached to the back of the vertical member, multiple hanging rings attached to the upper end of the vertical member, and a spatula attached near the lower end of the diagonal member. By adjusting the hanging position using the hanging rings and adjusting the weight of the weight, the horizontal force required for the spatula to be pressed against the steel pipe sheet pile can be secured, thereby removing the soil from the area surrounded by the steel pipe sheet pile and the steel pipe joint.

[0005] The technology described in Patent Document 2 relates to a method for removing soil shovels from an area surrounded by a steel pipe sheet pile and a steel pipe joint. This soil shovel removal method includes the steps of driving a sheet pile into the ground and, before excavating the ground on the excavation side of the sheet pile, lowering a water jet nozzle along the sheet pile while spraying jets vertically downward and horizontally to cut the edge between the sheet pile and the soil on the excavation side of the sheet pile with a horizontal jet. After the step of cutting the edge between the soil on the excavation side of the sheet pile, a step of excavating the ground on the excavation side of the sheet pile is further carried out.

[0006] The technology described in Patent Document 3 relates to a soil removal device for removing soil (soil spatula) adhering to the side of a steel pipe sheet pile. This soil removal device has a "spatula" attached to a support that is curved so that it fits closely to the side of the steel pipe sheet pile to be treated. This "spatula" has an upper "spatula" and a lower "spatula." Jet nozzles are provided on the underside of the upper "spatula" and on the top surface of the lower "spatula" to spray jet water onto the soil adhering to the side of the steel pipe sheet pile.

[0007] The technology described in Patent Document 4 relates to a deposit removal device for removing deposits attached to the exposed surface of an embedded pile. This deposit removal device includes a main body formed to a shape corresponding to the exposed surface of the pile and a shaft connected to the main body. A plurality of water injection nozzles are arranged on the left and right sides of the main body's surface facing the pile to spray water onto the deposits and remove them. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6786444 [Patent Document 2] Patent No. 6754245 [Patent Document 3] Patent No. 3528149 [Patent Document 4] Japanese Patent Application Laid-Open No. 2002-242219 Summary of the Invention [Problem to be solved by the invention]

[0009] As mentioned above, to construct underwater structures such as marine structures, well foundations are formed using steel pipe sheet piles. During this process, it is necessary to remove the soil (soil rake) that remains after excavation work inside the well. Since it is impossible to remove the soil (soil rake) when the inside of the well is dry, in order to remove the soil (soil rake) that has adhered to the inner wall surface of the steel pipe, a high-pressure water jet nozzle is attached to the tip of a high-pressure water jet pipe (e.g., a steel pipe), and high-pressure water is sprayed from this high-pressure water jet nozzle onto the soil (soil rake).

[0010] When constructing a well foundation using steel pipe sheet piles, shoring (walings, bracing beams, etc.) is installed inside the well to support the steel pipe sheet piles so that they do not collapse into the well. To install bracing beams inside the well, walings are installed on the inner surface of the steel pipe sheet piles, and bracing beams are placed between the opposing walings. Hereinafter, the components installed inside the well, including bracing beams and walings, are referred to as shoring.

[0011] Multiple levels of support are installed vertically within the well, but since excavation work begins after the first level (top level) of support is installed, if an attempt is made to remove the soil (soil spatula) using a device that sprays high-pressure water, the distance from the point where the high-pressure water spray pipe for spraying the high-pressure water is inserted into the support to the inner surface of the well where the soil (soil spatula) is located becomes long (for example, up to about 1,400 mm), and the power of the high-pressure water is weakened. Also, since it is necessary to bring the high-pressure water spray pipe close to the inner surface of the well to avoid wale rising, a support device (H shape It is also necessary to process materials (such as steel) to create specially shaped supports, which means that the production of the soil removal device takes time and effort.

[0012] The soil shoveling device and soil shoveling method for steel pipe sheet pile shaft foundations of the present invention have been proposed in consideration of the above-mentioned circumstances, and aim to provide a device and method that can easily and reliably shovel soil when constructing a steel pipe sheet pile shaft foundation without using a soil shoveling device with a special shape. [Means for solving the problem]

[0013] The soil removal device and soil removal method for a steel pipe sheet pile well foundation according to the present invention have been proposed in view of the above circumstances, and have the following characteristics: That is, the soil removal device and soil removal method for a steel pipe sheet pile well foundation according to the present invention relate to a device and method for removing soil ladles present on the inner peripheral surface of a well formed with steel pipe sheet piles when constructing a steel pipe sheet pile well foundation.

[0014] The soil removal device for the steel pipe sheet pile foundation according to the present invention is arranged so that the soil is removed from the steel pipe sheet pile side rather than the wale of the support structure installed on the inner surface of the well. Between the inner side of the joint part of the steel pipe sheet pile and the wale of the support The well is provided with a pipe insertion hole that penetrates the well in the vertical direction, a high-pressure water injection pipe that is inserted into the pipe insertion hole and injects high-pressure water toward the inner peripheral surface of the well, and a high-pressure water supply device that supplies high-pressure water to the high-pressure water injection pipe. The high-pressure water injection pipe is characterized by having a plurality of high-pressure water injection ports provided at equal intervals in the circumferential direction at its tip.

[0015] and, The pipe insertion hole is formed by a sheath pipe buried in the filling concrete filled between the inner side of the joint part of the steel pipe sheet pile and the wale of the support. It has been done.

[0016] In the soil removal device for the steel pipe sheet pile foundation described above, the plurality of high-pressure water injection ports are arranged in the following directions with respect to the axial direction of the high-pressure water injection pipe: Horizontal and diagonally upward It is possible to provide a structure that opens toward the

[0017] The method for dropping soil in a steel pipe sheet pile well foundation according to the present invention is a method for dropping soil in a steel pipe sheet pile foundation on the inner circumferential surface of a well, the method being carried out by: Between the inner surface of the joint part of the steel pipe sheet pile and the wale of the support, This method is characterized by including the steps of providing a pipe insertion hole that penetrates in the vertical direction, inserting a high-pressure water injection pipe into the pipe insertion hole, and removing dirt on the inner surface of the well by injecting high-pressure water from a plurality of high-pressure water injection ports that are provided at equal intervals around the circumferential direction at the tip of the high-pressure water injection pipe.

[0018] and, The pipe insertion hole is formed by burying a sheath pipe in the interfacial concrete when filling the space between the inner surface of the joint part of the steel pipe sheet pile and the wale of the support structure.

[0019] In the above-mentioned method for removing soil from a steel pipe sheet pile foundation, the plurality of high-pressure water injection ports are each arranged in the axial direction of the high-pressure water injection pipe as follows: Horizontal and diagonally upward By jetting high-pressure water from each of the high-pressure water jetting ports, it is possible to remove dirt from the inner circumferential surface of the well. [Effects of the Invention]

[0020] According to the soil removal device and soil removal method for a steel pipe sheet pile shaft foundation of the present invention, a pipe insertion hole penetrating in the vertical direction is provided on the steel pipe sheet pile side of the wale of the support installed on the inner circumferential surface of the shaft well. This pipe insertion hole can be formed by burying a sheath pipe in the interfacial concrete when filling the interfacial concrete between the inner surface of the joint part of the steel pipe sheet pile and the wale of the support.

[0021] Then, a high-pressure water injection pipe is inserted into the pipe insertion hole (sheath pipe), and high-pressure water is injected from the high-pressure water injection nozzle provided at the tip of the high-pressure water injection pipe onto the inner surface of the shaft (the inner surface of the steel pipe sheet pile / especially the joint part of the steel pipe sheet pile), thereby removing soil and sand (soil spallers) present on the inner surface of the shaft.

[0022] In this way, with the soil removal device and soil removal method for a steel pipe sheet pile foundation according to the present invention, the high-pressure water injection pipe can be installed closer to the steel pipe sheet pile than the waling of the support installed on the inner periphery of the well, thereby shortening the distance from the high-pressure water injection port to the inner periphery of the well where the soil (soil removal device) is located. As a result, the high-pressure water is injected onto the soil (soil removal device) without weakening in force, making it possible to easily and reliably remove the soil without using a specially shaped soil removal device. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a schematic diagram (side view) of a soil removal device for a steel pipe sheet pile well foundation according to an embodiment of the present invention. [Figure 2] 1 is a schematic diagram (partial plan view) of a pipe insertion hole of a soil removal device in a steel pipe sheet pile well foundation according to an embodiment of the present invention. [Figure 3] 1 is an explanatory diagram showing the shape of a high-pressure water jet nozzle (jet nozzle) used in a soil removal device in a steel pipe sheet pile well foundation according to an embodiment of the present invention. FIG. [Figure 4] 1 is a flowchart showing the steps of a method for removing soil from a steel pipe sheet pile well foundation according to an embodiment of the present invention. [Figure 5] Schematic diagram (side view) of a soil removal device for a conventional steel pipe sheet pile foundation. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, with reference to the drawings, an earth removal device and an earth removal method (hereinafter sometimes abbreviated as earth removal device and earth removal method) for a steel pipe sheet pile shaft foundation according to an embodiment of the present invention will be described.

[0025] Figures 1 to 4 illustrate a soil scrubbing device and a soil scrubbing method according to an embodiment of the present invention. Figure 1 is a schematic diagram (side view) of the soil scrubbing device, Figure 2 is a schematic diagram (partial plan view) of a pipe insertion hole, Figure 3 is a schematic diagram showing the shape of a high-pressure water injection port (injection nozzle), and Figure 4 is a flowchart showing the steps of the soil scrubbing method. Figure 5 is a schematic diagram (side view) of a conventional soil scrubbing device. In Figure 3, (a) is a schematic side view, and (b) is a schematic plan view.

[0026] <Features of the soil removal device> The soil removal device according to an embodiment of the present invention is a device used when forming a shaft foundation using steel pipe sheet piles in order to construct underwater structures such as marine structures, and is designed to remove soil (soil removal devices) present on the inner surface of the shaft (the inner surface of the steel pipe sheet pile, particularly the joints connecting adjacent steel pipe sheet piles) by spraying high-pressure water against the inner surface of the shaft (the inner surface of the steel pipe sheet pile).

[0027] This soil removal device is particularly characterized by the fact that a pipe insertion hole that penetrates vertically is provided on the steel pipe sheet pile side of the wale of the support work installed on the inner surface of the well, a high-pressure water injection pipe is inserted into the pipe insertion hole, and high-pressure water is injected from a high-pressure water injection nozzle provided at the tip of the high-pressure water injection pipe.

[0028] <Details of the soil removal device> 1 and 2, a soil removal device according to an embodiment of the present invention includes a pipe insertion hole 50 that penetrates in the vertical direction and is provided closer to the steel pipe sheet pile 10 than the waling 20 of the support to be installed on the inner circumferential surface of the well (steel pipe sheet pile 10), a high-pressure water injection pipe 60 that is inserted into the pipe insertion hole 50 and injects high-pressure water toward the inner circumferential surface of the well (steel pipe sheet pile 10), and a high-pressure water supply device 90 that supplies high-pressure water to the high-pressure water injection pipe 60. The support is made up of members such as the waling 20 and struts 30.

[0029] <Steel pipe sheet pile> The steel pipe sheet pile 10 is a steel pipe pile with a joint 40 attached, and is a component that can be used to construct a highly rigid wall. The soil removal device according to this embodiment uses a steel pipe sheet pile 10 with a circular cross section, as shown in FIG. 2, but steel pipe sheet piles 10 of an appropriate shape can be used depending on various conditions, such as the shape of the well foundation to be constructed and the soil quality of the construction site. The joints 40 of the steel pipe sheet pile 10 also come in various shapes, and while a PP-type joint 40 is used in this embodiment as shown in FIG. 2, joints 40 of other shapes, such as a PT-type or LT-type joint 40, may also be used.

[0030] <Pipe insertion hole> As shown in Fig. 1, the pipe insertion hole 50 is provided between the inner surface of the joint 40 of the steel pipe sheet pile 10 and the waling 20 of the support. As shown in Fig. 2, this pipe insertion hole 50 can be formed by a sheath pipe 51 buried in the filling concrete 110 filled between the inner surface of the joint 40 of the steel pipe sheet pile 10 and the waling 20 of the support. The joint 40 of the steel pipe sheet pile 10 forms a recess between adjacent steel pipe sheet piles 10. The soil (soil spatula 200) present in this recess cannot be completely removed by excavation equipment such as a clamshell.

[0031] In a conventional soil scrubber, as shown in FIG. 5, a high-pressure water jetting pipe 60 is positioned toward the inner circumferential surface of the well (steel pipe sheet pile 10) from the inside of the well of the wale 20, and the soil scrubber 200 is removed. To bring the high-pressure water jetting nozzle 70 of the high-pressure water jetting pipe 60 closer to the inner circumferential surface of the well (steel pipe sheet pile 10), the high-pressure water jetting pipe 60 or its support member had to be modified. In contrast, the soil scrubber of the present invention can install the high-pressure water jetting pipe 60 outside the well of the wale 20, thereby effectively and reliably removing the soil scrubber 200. In FIG. 5, components having the same functions as those of the present invention are designated by the same reference numerals.

[0032] <High-pressure water injection pipe> The high-pressure water injection pipe 60 is a pipe for delivering high-pressure water supplied from a high-pressure water supply device 90 to an injection nozzle 100. This high-pressure water injection pipe 60 is, for example, a pipe made by connecting multiple segments of carbon steel pipe for piping in series, with a length corresponding to the depth of the well. The injection nozzle 100 is connected to the tip end, and a high-pressure hose 80 made of a flexible pipe is connected to the base end. The high-pressure hose 80 is then connected to the high-pressure water supply device 90. Although not shown, the multiple segments of carbon steel pipe for piping are connected to each other with high-pressure sockets to form a single high-pressure water injection pipe 60. Alternatively, an L-shaped pipe may be attached to the upper end of the uppermost carbon steel pipe for piping, and the high-pressure hose 80 may be connected to this L-shaped pipe. The length of the high-pressure water injection pipe 60 can be adjusted depending on the number and lengths of the carbon steel pipes for piping to be connected.

[0033] <High-pressure water nozzle> The high-pressure water jet nozzle 70 according to this embodiment is provided in a jet nozzle 100 that is connected in communication with the tip of the high-pressure water jet pipe 60. As shown in FIG. 3(b), the jet nozzle 100 is provided with a plurality of high-pressure water jet nozzles 70 (for example, five nozzles) that are equally spaced in the circumferential direction. The high-pressure water jet nozzles 70 may be installed at three, four, five, six or more positions as long as they are equally spaced in the circumferential direction. The amount of high-pressure jet water jetted from the high-pressure water jet nozzle 70 is, for example, 900 L / min.

[0034] As shown in Fig. 3(a), each high-pressure water jet orifice 70 opens in a plurality of directions, each at a different angle relative to the axial direction of the high-pressure water jet pipe 60. The high-pressure water jet orifice 70 shown in Fig. 3(a) has three openings (a diagonally downward opening 70a, a lateral opening 70b, and a diagonally upward opening 70c). However, it is preferable to omit the diagonally downward opening 70a and have only two openings: a lateral opening 70b and a diagonally upward opening 70c. That is, if the diagonally downward opening 70a is provided, a force pushing the high-pressure water jet pipe 60 upward acts due to the reaction force of the high-pressure jet water. For this reason, there is a risk that the high-pressure water jet pipe 60 cannot be held stably. Therefore, it is preferable to have the high-pressure water jet orifice 70 open in two locations: a lateral opening 70b and a diagonally upward opening 70c.

[0035] In the example shown in Figure 3(a), the diagonally downward opening 70a is angled 30° downward with respect to the axis of the injection nozzle 100, the horizontal opening 70b is angled 90° with respect to the axis of the injection nozzle 100, and the diagonally upward opening 70c is angled 50° upward with respect to the axis of the injection nozzle 100. Note that the angle of each opening with respect to the axis of the injection nozzle 100 is not limited to the example shown in Figure 3(a), and can be changed as appropriate depending on the shape of the steel pipe sheet pile to be constructed, the attachment condition of the soil spallers, etc.

[0036] <How to remove the soil> The soil removal method according to an embodiment of the present invention is a method for removing a soil shovel 200 present on the inner surface of a shaft (steel pipe sheet pile 10) when forming a shaft foundation using steel pipe sheet piles 10 to construct an underwater structure such as an offshore structure. To construct a shaft foundation using steel pipe sheet piles 10 when constructing an underwater structure such as an offshore structure, the steel pipe sheet piles 10 are driven into the underwater ground to form a steel pipe sheet pile well, and an excavation machine such as a clamshell excavator is used to excavate and remove the soil from the well. However, excavation machines such as a clamshell excavator cannot completely remove the soil shovel 200 attached to the inner surface of the steel pipe sheet pile 10. Removal of the soil is particularly difficult in the area around the joints 40 of the steel pipe sheet pile 10, which are recessed.

[0037] 4, the method for removing soil shovels according to an embodiment of the present invention includes the steps of: (S1) providing a pipe insertion hole 50 penetrating vertically on the steel pipe sheet pile 10 side of the waling 20 of the support to be installed on the inner circumferential surface of the shaft; (S2) inserting a high-pressure water injection pipe 60 into the pipe insertion hole 50; and (S3) removing the soil shovels 200 present on the inner circumferential surface of the shaft by injecting high-pressure water from a plurality of high-pressure water injection ports 70 provided at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60. The above steps (S1 to S3) are then repeated until the soil shovels 200 have been removed from all of the inner circumferential surface of the shaft (S4). When the soil shovels 200 have been removed from all of the inner circumferential surface of the shaft, the process is terminated.

[0038] <Process for making pipe insertion holes> In the process of providing the pipe insertion hole 50, when filling concrete 110 is filled between the inner surface of the joint 40 of the steel pipe sheet pile 10 and the wale 20 of the support, the pipe insertion hole 50 is formed by burying a sheath pipe 51 in the filling concrete 110. A high-pressure water injection pipe 60 is inserted into this sheath pipe 51 to remove a soil spatula 200 present on the inner surface of the well (particularly, the joint 40 portion of the steel pipe sheet pile 10).

[0039] <Process for removing the soil> As shown in Fig. 3(b), the high-pressure water injection ports 70 according to this embodiment are provided at a plurality of locations (e.g., five locations) at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60. As shown in Fig. 3(a), each high-pressure water injection port 70 opens at least laterally and diagonally upward with respect to the axial direction of the high-pressure water injection pipe 60 (lateral opening 70b, diagonally upward opening 70c). Therefore, by injecting high-pressure water from each high-pressure water injection port 70, it is possible to effectively remove the soil shovels 200 present on the inner circumferential surface of the shaft (steel pipe sheet pile 10).

[0040] Furthermore, since the high-pressure water injection nozzles 70 are provided at multiple locations (e.g., five locations) at equal circumferential intervals at the tip of the high-pressure water injection pipe 60, the high-pressure water injection pipe 60 can be balanced when injecting high-pressure water. For example, if the high-pressure water injection nozzles 70 are provided only on the side facing the inner circumferential surface of the well shaft (steel pipe sheet pile 10), when high-pressure water is injected from the high-pressure water injection nozzles 70, the high-pressure water injection pipe 60 receives a reaction force from the inner circumferential surface of the well shaft (steel pipe sheet pile 10), and moves in a direction away from the inner circumferential surface of the well shaft (steel pipe sheet pile 10). Furthermore, if the injection direction of the high-pressure water injected from the high-pressure water injection nozzles 70 is deviated for some reason, the high-pressure water injection pipe 60 cannot be balanced. In other words, the high-pressure water injection pipe 60 cannot be kept in the desired position, and so-called, the high-pressure water injection pipe 60 becomes unbalanced. Therefore, in this embodiment, the high-pressure water injection nozzles 70 are provided at multiple locations at equal circumferential intervals at the tip of the high-pressure water injection pipe 60. [Explanation of symbols]

[0041] 10 Steel pipe sheet pile 20 Belly Raise 30 Beam 40 Joints 50 Pipe insertion hole 51 Sheath tube 60 High-pressure water injection pipe 70 High-pressure water nozzle 70a Diagonally downward opening 70b Lateral opening 70c Diagonal upward opening 80 High Pressure Hose 90 High-pressure water supply device 100 spray nozzles 110 Filling concrete 200 Earthenware

Claims

1. A device for removing soil shovels present on the inner circumferential surface of a well formed with steel pipe sheet piles when constructing a steel pipe sheet pile well foundation, a pipe insertion hole penetrating in the vertical direction, the pipe insertion hole being provided on the steel pipe sheet pile side of the wale of the support installed on the inner peripheral surface of the well and between the inner surface side of the joint portion of the steel pipe sheet pile and the wale of the support; a high-pressure water injection pipe that is inserted into the pipe insertion hole and injects high-pressure water toward the inner circumferential surface of the well; a high-pressure water supply device that supplies high-pressure water to the high-pressure water injection pipe; Equipped with The high-pressure water jet pipe has a plurality of high-pressure water jet ports provided at equal intervals in the circumferential direction at its tip, The pipe insertion hole is composed of a sheath pipe embedded in filler concrete filled between the inner surface of the joint portion of the steel pipe sheet pile and the wale of the support structure. A soil removal device for a steel pipe sheet pile well foundation.

2. The plurality of high-pressure water jetting ports are each open laterally and obliquely upward with respect to the axial direction of the high-pressure water jetting pipe.

2. The soil removal device for a steel pipe sheet pile well foundation according to claim 1.

3. A method for removing soil shovels present on the inner circumferential surface of a well formed with steel pipe sheet piles when constructing a steel pipe sheet pile well foundation, comprising: A pipe insertion hole is provided between the inner surface of the joint portion of the steel pipe sheet pile and the wale of the support, the pipe insertion hole penetrating in the vertical direction, on the steel pipe sheet pile side of the wale of the support installed on the inner peripheral surface of the well, the pipe insertion hole is formed by burying a sheath pipe in the filling concrete when filling concrete is filled between the inner surface side of the joint portion of the steel pipe sheet pile and the wale of the support; A high-pressure water jet pipe is inserted into the pipe insertion hole, The high-pressure water is sprayed from a plurality of high-pressure water spray nozzles provided at equal intervals in the circumferential direction at the tip of the high-pressure water spray pipe to remove the soil existing on the inner peripheral surface of the well. A method for removing soil from a steel pipe sheet pile well foundation.

4. The plurality of high-pressure water injection ports are each open in a lateral direction and an obliquely upward direction with respect to the axial direction of the high-pressure water injection pipe, By injecting high-pressure water from each of the high-pressure water injection ports, a soil shovel present on the inner peripheral surface of the well is removed. The method for removing soil from a steel pipe sheet pile foundation according to claim 3.

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