Dirt removing device and dirt removing method for steel pipe sheet pile well foundation

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 an earth spatula removing device and an earth spatula removing method in a steel pipe sheet pile shaft foundation. Specifically, when constructing a shaft foundation using steel pipe sheet piles, the present invention relates to a device and a method for effectively and reliably removing the earth spatulas existing at the joint portions of the steel pipe sheet piles.

Background Art

[0002] To construct underwater structures such as offshore structures, steel pipe sheet piles are driven into the ground existing underwater to form a steel pipe sheet pile shaft, and the earth and sand inside the shaft are removed by excavating the earth and sand inside the shaft using an excavating machine such as a clam shell.

[0003] By the way, to construct a shaft foundation, the earth and sand inside the shaft must be removed. However, if only an excavating machine such as a clam shell is used, the earth and sand (earth spatulas) existing on the inner peripheral surface of the steel pipe sheet piles, particularly at the joint portions of the steel pipe sheet piles, cannot be removed. Therefore, conventionally, various techniques for removing the earth and sand (earth spatulas) existing on the inner peripheral surface of the steel pipe sheet piles, particularly at the joint portions of the steel pipe sheet piles, have been developed (see Patent Documents 1 to 4). In the following description, the earth and sand existing at the joint portions of the steel pipe sheet piles are described including the katakana as "earth spatulas", and the jig for removing the earth and sand is described in hiragana as "spatula" to distinguish between the two.

[0004] The technique described in Patent Document 1 relates to a jig for removing the earth spatulas in the portion surrounded by the steel pipe sheet pile and the steel pipe joint. This earth spatula removing jig includes a main body portion composed of a vertical member and an inclined member connected to the vicinity of the lower end portion of the vertical member so as to incline toward the earth spatula side, a weight-adjustable weight provided on the back surface of the vertical member, a plurality of suspension rings provided at the upper end portion of the vertical member, and a "spatula" provided in the vicinity of the lower end portion of the inclined member. Then, by adjusting the suspension position by the suspension rings and adjusting the weight of the weight, a horizontal force is secured so that the "spatula" is pressed against the steel pipe sheet pile with an arbitrary horizontal force, and the earth spatulas in the portion surrounded by the steel pipe sheet pile and the steel pipe joint are removed.

[0005] The technology described in Patent Document 2 relates to a method for removing soil plaster from the area enclosed by a steel pipe sheet pile and a steel pipe joint. This soil plaster removal method includes the steps of driving the 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, thereby separating the sheet pile from the soil on the excavation side of the sheet pile with the horizontal jet. After the step of separating the sheet pile from the soil on the excavation side of the sheet pile, the method further involves excavating the ground on the excavation side of the sheet pile.

[0006] The technology described in Patent Document 3 relates to a soil removal device for removing soil adhering to the sides of steel sheet piles. This soil removal device has a spatula attached to a support column, which is rounded to fit snugly against the side of the steel sheet pile to be processed. This spatula has an upper spatula and a lower spatula. Jet nozzles are provided on the lower surface of the upper spatula and the upper surface of the lower spatula to spray jet water onto the soil adhering to the side of the steel sheet pile.

[0007] The technology described in Patent Document 4 relates to an adhering material removal device for removing adhering material from the exposed surface of an embedded pile. This adhering material removal device comprises a main body formed in a shape corresponding to the exposed surface of the pile, and a shaft part that connects to the main body. Multiple water spray nozzles are arranged in the left-right direction on the surface of the main body facing the pile, for spraying water onto the adhering material to remove it. [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 Publication No. 2002-242219 [Overview of the project] [Problems that the invention aims to solve]

[0009] As mentioned above, steel sheet piles are used to form well foundations for underwater structures such as marine structures. In this process, it is necessary to remove soil (soil burr) that cannot be completely removed during the excavation work inside the well. Since it is impossible to remove the soil (soil burr) when the inside of the well is dry, a high-pressure water nozzle is attached to the tip of a high-pressure water injection pipe (for example, a steel pipe), and high-pressure water is injected from this nozzle onto the soil (soil burr).

[0010] Incidentally, when constructing a well casing foundation using steel sheet piles, shoring (such as walers and bracing) is installed inside the casing to prevent the steel sheet piles from collapsing into the casing. To install bracing inside the casing, walers are installed on the inner surface of the steel sheet piles, and bracing is placed between opposing walers. Hereinafter, members including bracing and walers installed inside the casing will be referred to as shoring.

[0011] Although multiple levels of support structures are installed vertically inside the well casing, excavation work is carried out after the first level (uppermost) of support structures is installed. If a device that sprays high-pressure water is used to remove soil (soil burr), the distance from the point where the high-pressure water injection pipe is inserted into the support structure to the inner surface of the well casing where the soil (soil burr) is located becomes long (for example, up to about 1,400 mm), weakening the force of the high-pressure water. In addition, because it is necessary to avoid bracing and bring the high-pressure water injection pipe close to the inner surface of the well casing, it is necessary to process the support structure (H-beam, etc.) for the high-pressure water injection pipe and manufacture a specially shaped support structure, which adds time and effort to the production of the soil burr removal device.

[0012] The soil removal device and soil removal method for steel pipe sheet pile caisson foundations according to the present invention were proposed in view of the above circumstances, and aim to provide a device and method that can easily and reliably remove soil when constructing steel pipe sheet pile caisson foundations without using a soil removal device with a special shape. [Means for solving the problem]

[0013] The soil removal device and soil removal method for steel pipe sheet pile well foundations according to the present invention were proposed in view of the above circumstances and have the following features. Specifically, the soil removal device and soil removal method for steel pipe sheet pile well foundations according to the present invention are devices and methods for removing soil present on the inner surface of a well casing formed of steel pipe sheet piles when constructing a steel pipe sheet pile well foundation.

[0014] The soil removal device for steel pipe sheet pile caisson foundations according to the present invention comprises a pipe insertion hole that penetrates vertically and is provided on the steel pipe sheet pile side of the bracing of the shoring installed on the inner circumference of the caisson; a high-pressure water injection pipe that is inserted through the pipe insertion hole and injects high-pressure water toward the inner circumference of the caisson; and a high-pressure water supply device that supplies high-pressure water to the high-pressure water injection pipe. Furthermore, 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] In the aforementioned soil removal device for steel pipe sheet pile caisson foundations, the pipe insertion holes can be formed by a sheathed pipe embedded in the infill concrete that fills the space between the inner surface of the joint portion of the steel pipe sheet pile and the bracing of the support structure.

[0016] In the soil removal device for steel pipe sheet pile caisson foundations described above, each of the multiple high-pressure water injection nozzles can be configured to open at least horizontally and diagonally upwards with respect to the axial direction of the high-pressure water injection pipe.

[0017] The present invention provides a method for removing soil plaster from a steel pipe sheet pile well foundation, comprising the steps of: providing a pipe insertion hole that penetrates vertically on the steel pipe sheet pile side of the bracing of the support structure installed on the inner circumference of the well casing; inserting a high-pressure water injection pipe into the pipe insertion hole; and removing soil plaster present on the inner circumference of the well casing by injecting high-pressure water from a plurality of high-pressure water injection nozzles provided at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe.

[0018] In the above-described method for removing soil with a trowel in a steel pipe sheet pile caisson foundation, the pipe insertion hole can be formed by embedding a sheathed pipe in the infill concrete when filling the gap between the inner surface of the joint portion of the steel pipe sheet pile and the bracing of the support structure.

[0019] In the method for removing soil plaster from the steel pipe sheet pile well foundation described above, each of the multiple high-pressure water injection nozzles opens at least horizontally and diagonally upward with respect to the axial direction of the high-pressure water injection pipe. By injecting high-pressure water from each of the nozzles, it is possible to remove the soil plaster present on the inner surface of the well casing. [Effects of the Invention]

[0020] According to the present invention, a soil removal device and soil removal method for steel pipe sheet pile caisson foundations are provided, with a pipe insertion hole that penetrates vertically on the steel pipe sheet pile side of the bracing of the shoring installed on the inner circumference of the caisson. This pipe insertion hole can be formed by embedding a sheathed pipe in the infill concrete when filling the gap between the inner surface of the joint portion of the steel pipe sheet pile and the bracing of the shoring.

[0021] The high-pressure water jet pipe is inserted into the pipe insertion hole (sheath pipe), and high-pressure water is injected from the high-pressure water jet nozzle at the tip of the high-pressure water jet pipe onto the inner surface of the well casing (the inner surface of the steel sheet piles, especially the joints of the steel sheet piles), thereby removing the soil (soil trowels) present on the inner surface of the well casing.

[0022] Thus, in the soil removal device and the soil removal method for the steel pipe sheet pile shaft foundation according to the present invention, since the high-pressure water injection pipe can be installed on the steel pipe sheet pile side rather than on the shoring side installed on the inner peripheral surface of the shaft, the distance from the high-pressure water injection port to the inner peripheral surface of the shaft where the earth and sand (soil) exist becomes shorter. Therefore, since the high-pressure water is sprayed onto the earth and sand (soil) without weakening its momentum, it is possible to easily and surely remove the soil without using a special-shaped soil removal device.

Brief Description of the Drawings

[0023] [Figure 1] Schematic diagram (side view) of the soil removal device for the steel pipe sheet pile shaft foundation according to an embodiment of the present invention. [Figure 2] Schematic diagram (partial plan view) of the pipe insertion hole of the soil removal device for the steel pipe sheet pile shaft foundation according to an embodiment of the present invention. [Figure 3] Explanatory drawing showing the shape of the high-pressure water injection port (injection nozzle) used in the soil removal device for the steel pipe sheet pile shaft foundation according to an embodiment of the present invention. [Figure 4] Flowchart showing the procedure of the soil removal method for the steel pipe sheet pile shaft foundation according to an embodiment of the present invention. [Figure 5] Schematic diagram (side view) of the soil removal device for the conventional steel pipe sheet pile shaft foundation.

Embodiments for Carrying Out the Invention

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

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

[0026] <Features of the soil scraper removal device> The soil scraper removal device according to an embodiment of the present invention is a device used when forming a well foundation using steel sheet piles for constructing underwater structures such as marine structures. It removes soil (soil scraper) present on the inner surface of the well (the inner surface of the steel sheet piles / especially the joint portion connecting adjacent steel sheet piles) by spraying high-pressure water onto the inner surface of the well (the inner surface of the steel sheet piles).

[0027] This soil removal device is particularly characterized by having a pipe insertion hole that penetrates vertically on the steel sheet pile side of the bracing structure installed on the inner circumference of the well casing, a high-pressure water injection pipe being inserted through the pipe insertion hole, and high-pressure water being injected from a high-pressure water injection nozzle provided at the tip of the high-pressure water injection pipe.

[0028] <Details of the soil scraper removal device> As shown in Figures 1 and 2, the soil trowel removal device according to an embodiment of the present invention includes a pipe insertion hole 50 that penetrates vertically and is provided on the steel pipe sheet pile 10 side of the waling 20 of the shoring installed on the inner circumference of the well casing (steel pipe sheet pile 10), a high-pressure water injection pipe 60 that is inserted through the pipe insertion hole 50 and injects high-pressure water toward the inner circumference of the well casing (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 shoring is composed of members such as waling 20 and bracing 30.

[0029] <Steel pipe sheet piles> The steel pipe sheet pile 10 is a steel pipe pile with a joint 40 installed, and is a component that can construct a wall with high rigidity. As shown in Figure 2, the soil trowel removal device according to this embodiment uses a steel pipe sheet pile 10 with a circular cross-section, but a steel pipe sheet pile 10 of an appropriate shape can be used according to various conditions such as the shape of the well foundation to be constructed and the soil type of the construction site. In addition, there are various shapes of joints 40 for the steel pipe sheet pile 10, and as shown in Figure 2, a PP type joint 40 is used in this embodiment, but other shapes of joints 40 such as PT type or LT type joints 40 may also be used.

[0030] <Pipe insertion hole> As shown in Figure 1, the pipe insertion hole 50 is provided between the inner surface of the joint 40 portion of the steel pipe sheet pile 10 and the waling 20 of the shoring. As shown in Figure 2, this pipe insertion hole 50 can be formed by a sheathed pipe 51 embedded in the infill concrete 110 that fills the space between the inner surface of the joint 40 portion of the steel pipe sheet pile 10 and the waling 20 of the shoring. The joint 40 portion of the steel pipe sheet pile 10 is a recess between adjacent steel pipe sheet piles 10. The soil (soil trowel 200) present in this recess cannot be completely removed by excavation equipment such as a clamshell.

[0031] In conventional soil trowel removal devices, as shown in Figure 5, a high-pressure water jet pipe 60 was directed from the inside of the well casing of the waling 20 toward the inner surface of the well casing (steel pipe sheet pile 10) to remove the soil trowel 200. Furthermore, in order to bring the high-pressure water jet nozzle 70 of the high-pressure water jet pipe 60 closer to the inner surface of the well casing (steel pipe sheet pile 10), processing had to be performed on the high-pressure water jet pipe 60 or its support member. In this respect, the soil trowel removal device of the present invention allows the high-pressure water jet pipe 60 to be installed on the outside of the well casing of the waling 20, so that the soil trowel 200 can be removed effectively and reliably. Note that in Figure 5, the same reference numerals are used for members having the same function as in the present invention.

[0032] <High-pressure water jet pipe> The high-pressure water injection pipe 60 is a pipe for supplying high-pressure water from the high-pressure water supply device 90 to the injection nozzle 100. This high-pressure water injection pipe 60 is, for example, a pipe whose length corresponds to the depth of the wellhead, made by connecting multiple divided carbon steel pipes for piping in series. The injection nozzle 100 is connected to the tip, and a high-pressure hose 80 made of flexible pipe is connected to the base. The high-pressure hose 80 is connected to the high-pressure water supply device 90. Although not shown in the figure, multiple divided carbon steel pipes for piping are connected to each other by 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 carbon steel pipe for piping located at the top, 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 by the number and length of the carbon steel pipes for piping that are connected.

[0033] <High-pressure water nozzle> In this embodiment, the high-pressure water injection port 70 is provided on an injection nozzle 100 connected to the tip of the high-pressure water injection pipe 60. As shown in Figure 3(b), the injection nozzle 100 is provided with multiple (for example, 5) high-pressure water injection ports 70 at equal intervals in the circumferential direction. The installation positions of the high-pressure water injection ports 70 only need to be at equal intervals in the circumferential direction, and may be 3, 4, 5, 6 or more. The amount of high-pressure water injected from the high-pressure water injection ports 70 is, for example, 900 L / min.

[0034] As shown in Figure 3(a), each high-pressure water nozzle 70 opens in multiple directions with different angles relative to the axial direction of the high-pressure water injection pipe 60. Although the high-pressure water nozzle 70 shown in Figure 3(a) has three openings (a diagonally downward opening 70a, a horizontal opening 70b, and a diagonally upward opening 70c), it is preferable to omit the diagonally downward opening 70a and have only two openings: a horizontal opening 70b and a diagonally upward opening 70c. In other words, if there is a diagonally downward opening 70a, the reaction force of the high-pressure water injection will act to push the high-pressure water injection pipe 60 upward. Therefore, there is a risk that the high-pressure water injection pipe 60 may not be able to be held stably, and it is preferable to have a high-pressure water nozzle 70 with two openings: a horizontal opening 70b and a diagonally upward opening 70c.

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

[0036] <Method for removing soil with a trowel> The soil scraping method according to an embodiment of the present invention is a method for removing soil scraps 200 present on the inner surface of a well casing (steel pipe sheet pile 10) when forming a well casing foundation using steel pipe sheet piles 10 for the construction of an underwater structure such as an offshore structure. When constructing a well casing foundation using steel pipe sheet piles 10 for an underwater structure such as an offshore structure, steel pipe sheet piles 10 are driven into the ground present underwater to form a steel pipe sheet pile well casing, and the soil inside the well casing is excavated and discharged using an excavation machine such as a clamshell. However, with excavation equipment such as a clamshell, it is not possible to completely remove the soil scraps 200 attached to the inner surface of the steel pipe sheet pile 10, and in particular, the joint 40 portion of the steel pipe sheet pile 10 is recessed, making soil removal difficult.

[0037] Therefore, the soil plaster removal method according to the embodiment of the present invention, as shown in Figure 4, includes the steps of: providing a pipe insertion hole 50 that penetrates vertically on the steel pipe sheet pile 10 side of the waling 20 of the support structure installed on the inner circumference of the well casing (S1); inserting a high-pressure water injection pipe 60 into the pipe insertion hole 50 (S2); and removing soil plasters 200 present on the inner circumference of the well casing by injecting high-pressure water from a plurality of high-pressure water injection nozzles 70 provided at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60 (S3). The above steps (S1 to S3) are repeated until the soil plasters 200 are removed from the entire inner circumference of the well casing (S4), and the process is terminated when the soil plasters 200 have been removed from the entire inner circumference of the well casing.

[0038] <Step of creating a pipe insertion hole> In the process of creating the pipe insertion hole 50, when filling the space between the inner surface of the joint 40 portion of the steel sheet pile 10 and the bracing 20 of the support structure with infill concrete 110, the sheath pipe 51 is embedded in the infill concrete 110 to form the pipe insertion hole 50. The high-pressure water injection pipe 60 is inserted into this sheath pipe 51 to remove the soil trowel 200 present on the inner surface of the well casing (especially the joint 40 portion of the steel sheet pile 10).

[0039] <Process of removing the soil trowel> As shown in Figure 3(b), the high-pressure water nozzles 70 according to this embodiment are provided at multiple locations (for example, 5 locations) at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60. Each high-pressure water nozzle 70 opens at least in the lateral direction and diagonally upward direction 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 nozzle 70, the soil trowels 200 present on the inner circumferential surface of the well casing (steel pipe sheet pile 10) can be effectively removed.

[0040] Furthermore, since the high-pressure water nozzles 70 are provided at multiple locations (for example, 5 locations) at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60, the high-pressure water injection pipe 60 can be balanced when high-pressure water is injected. For example, if the high-pressure water nozzles 70 are provided only on the side facing the inner circumferential surface of the well casing (steel pipe pile 10), when high-pressure water is injected from the nozzles 70, the high-pressure water injection pipe 60 will receive a reaction force from the inner circumferential surface of the well casing (steel pipe pile 10) and will move away from the inner circumferential surface of the well casing (steel pipe pile 10). Also, if the injection direction of the high-pressure water injected from the nozzles 70 is shifted for some reason, the high-pressure water injection pipe 60 cannot maintain equilibrium (balance). In other words, the high-pressure water injection pipe 60 cannot be kept in the desired position, resulting in a state where the high-pressure water injection pipe 60 becomes unstable. Therefore, in this embodiment, multiple high-pressure water nozzles 70 are provided at equal intervals in the circumferential direction at the tip of the high-pressure water injection pipe 60. [Explanation of Symbols]

[0041] 10 Steel pipe sheet piles 20 Abdominal Stomach 30 bracing beams 40 fittings 50 Pipe insertion holes 51 Sheathed tube 60 High-pressure water injection pipes 70 High-pressure water nozzles 70a Opening in a diagonal downward direction 70b Lateral opening 70c Opening at an upward angle 80 High-pressure hose 90 High-pressure water supply device 100 spray nozzles 110 Insulated concrete 200 soil trowel

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 and provided on the steel pipe sheet pile side of the waling of the support installed on the inner peripheral surface of the well; 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. A soil removal device for a steel pipe sheet pile well foundation.

2. 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.

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

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

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

4. 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 on the steel pipe sheet pile side of the waling of the support structure installed on the inner circumferential surface of the well, penetrating in the vertical direction; 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.

5. 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. The method for removing soil from a steel pipe sheet pile foundation according to claim 4.

6. Each of the plurality of high-pressure water injection ports is open at least laterally and obliquely upward 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.

6. The method for removing soil from a steel pipe sheet pile foundation according to claim 4 or 5.

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