Press-fitting method of steel sheet pile

Abstract

To provide a press-fitting method for steel sheet piles, which can improve supportive strength of steel sheet piles more simply and reliably than before.SOLUTION: A method includes a step to place a solidification material injection pipe 20 with which solidification material (30) can be injected at least at the lower end of the steel sheet pile in the depth direction of a steel sheet pile 10, a step to press the steel sheet pile with the solidification material injection pipe arranged therein into the ground, and a step to inject the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground to a predetermined depth; in the step to inject the solidification material into the ground the steel sheet pile is moved up and down while injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for press-fitting a steel sheet pile, which can improve the bearing capacity of the steel sheet pile more than before. [Background technology]

[0002] Although steel sheet piles have a long history of use as temporary earth retaining materials, their cross-sectional performance is smaller than that of steel pipes or concrete piles. For this reason, they are not listed as foundation structures that can withstand vertical loads or horizontal resistance forces in the "Specifications for Highway Bridges and Commentary" or the "Design Standards for Railway Structures and Commentary." However, there is a need to utilize the above-mentioned steel sheet piles not only as temporary materials but also as permanent structures if possible.

[0003] Furthermore, it is difficult to drive steel sheet piles into ground with an N value of 25 or more using only press-in. To address this, a steel sheet pile press-in method that also uses a water jet can be adopted, as disclosed in Patent Document 1. In addition, a press-in method that also uses an auger and a crush piler (registered trademark) may also be selected. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-057171 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above situation, when vertical and horizontal loads act on the top of the steel sheet pile, supplementary construction methods such as foot protection injection methods are required to improve the bearing capacity of the steel sheet pile. If such supplementary construction methods are used separately, the associated extension of the construction period and increase in costs are unavoidable.

[0006] In view of the above-mentioned problems, the present invention has an object to provide a method for press-fitting a steel sheet pile, which can improve the bearing capacity of the steel sheet pile more simply and reliably than conventional methods. [Means for solving the problem]

[0007] The invention related to (1) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe capable of injecting a solidification material at least at the lower end of the steel sheet pile in the depth direction of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground to a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the steel sheet pile is pressed into the design depth by moving the steel sheet pile up and down while injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth.

[0008] The invention related to (2) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe capable of injecting a solidification material at least at the lower end of the steel sheet pile in the depth direction of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground and reaches a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the injection of the solidification material is started when the steel sheet pile reaches a design depth.

[0009] The invention related to (3) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe capable of injecting a solidification material at least at the lower end of the steel sheet pile in the depth direction of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground and reaches a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the steel sheet pile is pressed into a depth deeper than the design depth of the steel sheet pile, and injection of the solidification material is started while the steel sheet pile is raised to the design depth.

[0010] The invention related to (4) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe capable of injecting a solidification material at least at the lower end of the steel sheet pile in the depth direction of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground using an auger; injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground to a predetermined depth; and withdrawing the auger while stirring after the steel sheet pile has reached a design depth, wherein the step of injecting the solidification material into the ground is characterized in that the steel sheet pile is pressed into the design depth while injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth.

[0011] The invention related to (5) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground in combination with a water jet; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground and reaches a predetermined depth, wherein the step of pressing the steel sheet pile into the ground in combination with a water jet comprises pressing the steel sheet pile into the ground while discharging water to a predetermined depth that is shallower than a design depth of the steel sheet pile; and the step of injecting the solidification material into the ground comprises pressing the steel sheet pile into the design depth of the steel sheet pile while injecting the solidification material after the steel sheet pile has reached the predetermined depth, and the solidification material injection pipe has a jet nozzle and discharges the solidification material and the water.

[0012] The invention related to (6) is a method for pressing in a steel sheet pile described in any of (1) to (5) above, characterized in that the depth direction injection range of the solidification material is 1 to 2 times the effective height of the steel sheet pile.

[0013] The invention related to (7) is a method for pressing in a steel sheet pile described in any one of (1) to (3) and (5) above, characterized in that a plurality of the solidification material injection pipes are arranged, and the solidification material injection pipes are arranged on the front side and the back side of the steel sheet pile, respectively.

[0014] The invention related to (8) is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe in the depth direction of the steel sheet pile, which can inject solidification material only on the back side of the steel sheet pile; pressing the steel sheet pile with the solidification material injection pipe arranged therein into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged therein has been pressed into the ground and reaches a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the injection of the solidification material is started when the steel sheet pile reaches a design depth. [Effects of the Invention]

[0015] According to the steel sheet pile pressing-in method of the present invention, the separate foot protection injection method that was previously required to improve the bearing capacity of the steel sheet pile is no longer necessary. In other words, since the solidification material can be injected at the same time as the steel sheet pile is erected, construction can be carried out by a single contractor and construction machinery, which is expected to reduce costs by reducing machinery rental fees and construction days.

[0016] In addition, if the effect of improving the tip bearing capacity of steel sheet piles can be verified, it can be reflected in the bearing capacity coefficient of the bearing capacity estimation formula. This will, for example, lead to cost reductions by reducing the embedded length of steel sheet piles, and will also make it possible to use steel sheet piles as permanent construction materials. [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B are diagrams illustrating the press-in method for steel sheet piles, where (a) is the press-in method combined with an auger, and (b) is the press-in method alone. [Figure 2] FIG. 2 is a diagram illustrating a method for pressing in a steel sheet pile in the first embodiment of the present invention. [Figure 3]1A and 1B are diagrams illustrating an arrangement of solidification material injection pipes in a first embodiment of the present invention, in which (a) is a plan view of a steel sheet pile and (b) is a front view of the steel sheet pile. [Figure 4] Figures explaining the injection mode of solidification material in an embodiment of the present invention, where (a) is a cross-sectional view of the solidification material injection pipe when a steel sheet pile is pressed in, and (b) is a cross-sectional view of the solidification material injection pipe when the solidification material is injected. [Figure 5] FIG. 10 is a diagram illustrating a method for pressing in a steel sheet pile in a second embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating a method for pressing in a steel sheet pile in a third embodiment of the present invention. [Figure 7] FIG. 10 is a view illustrating a method for pressing in a steel sheet pile in a fourth embodiment of the present invention. [Figure 8] FIG. 1 is a diagram illustrating the configuration of a device for a water jet combined press-in method. [Figure 9] FIG. 13 is a view illustrating a method for pressing in a steel sheet pile in a fifth embodiment of the present invention. [Figure 10] FIG. 13 is a view illustrating a method for pressing in a steel sheet pile in a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, with reference to the drawings, embodiments of the method for pressing in a steel sheet pile of the present invention will be described. Note that the method for pressing in a steel sheet pile of the present invention is not necessarily limited to the embodiments shown below.

[0019] In addition, in each embodiment of the present invention, the auger-combined press-in method shown in Figure 1(a), the single press-in method shown in Figure 1(b), and the water jet-combined press-in method shown in Figure 8 can be suitably used, but the present invention is not necessarily limited to these press-in methods, and the press-in method can be selected depending on the location where the steel sheet pile is to be installed and the soil quality of the ground.

[0020] The auger-assisted press-in method shown in Figure 1(a) uses a device consisting of a power unit 1 as the driving source, a press-in machine 2 that presses in steel sheet piles 10, an auger drive unit 3, a casing 4, an auger 5, an auger head 6, etc.

[0021] According to this method, when it is difficult to press the steel sheet pile 10 alone, for example, in ground with an N value of 25 or more, the auger 5 is used to excavate the ground at the tip of the steel sheet pile 10, and then the auger 5 is pulled out while the steel sheet pile 10 is pressed in at the same time (so-called core-out press-in), thereby making it possible to stably press the steel sheet pile 10 into the designed depth. In addition to the core-out press-in method, the auger-combined press-in method also makes it possible to perform excavation with the auger head 6 and press-in of the steel sheet pile 10 simultaneously (so-called simultaneous excavation press-in), which can be applied to each embodiment described later.

[0022] On the other hand, the single press-in method shown in Figure 1(b) uses an apparatus consisting of a power unit 1 as a driving source and a press-in machine 2 for pressing in the steel sheet pile 10, and it is possible to stably press in the steel sheet pile 10 to the design depth, for example, in ground with an N value of 25 or less.

[0023] (First embodiment) The invention according to the first embodiment of the present invention is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe 20 capable of injecting a solidification material 30 at least at the lower end of the steel sheet pile 10 in the depth direction of the steel sheet pile 10; pressing the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein into the ground; and injecting the solidification material 30 into the ground when the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein has been pressed into the ground to a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the steel sheet pile is pressed into the design depth by moving the steel sheet pile up and down while injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth.

[0024] In the first embodiment, as shown in the plan view of the steel sheet pile 10 in Figure 3(a) and the front view of the steel sheet pile 10 in Figure 3(b), which explain the arrangement of the solidification material injection pipe 20, a solidification material injection pipe 20 capable of injecting solidification material 30 is arranged at least at the lower end of the steel sheet pile 10 in the depth direction of the position shown in the figure with respect to the steel sheet pile 10 before installation.

[0025] The method for fixing the solidification material injection pipe 20 to the steel sheet pile 10 is not particularly limited as long as it is fixed so that it does not easily fall off when the steel sheet pile 10 is pressed in.

[0026] Furthermore, in this embodiment, as shown in Figure 3, each steel sheet pile 10 connected by a joint portion 11 has multiple solidification material injection pipes 20 arranged on the front and back sides of the steel sheet pile 10, and further, the solidification material injection pipes 20 are arranged at positions opposite to the center of the steel sheet pile 10.

[0027] This arrangement prevents the solidification material 30 from being injected unevenly into the steel sheet pile 10. However, the number and locations of the solidification material injection pipes 20 are not necessarily limited, and can be selected appropriately depending on the required bearing capacity, soil quality, construction conditions, etc.

[0028] Next, the steel sheet pile 10 with the solidification material injection pipe 20 disposed therein is pressed into the ground to the design depth as shown in FIG. 2 (see (A)). Then, when the steel sheet pile 10 with the solidification material injection pipe 20 disposed therein reaches the design depth, the injection of the solidification material 30 begins. When injecting the solidification material 30, the steel sheet pile 10 is moved up and down while the solidification material 30 is being injected between the design depth of the steel sheet pile 10 and a depth shallower than the design depth (see (B)). Finally, the steel sheet pile 10 is pressed into the ground to the design depth (see (C)). In this way, by moving the steel sheet pile 10 up and down while injecting the solidification material 30, it is possible to mix the soil and the solidification material 30 in the ground, thereby improving the bearing capacity.

[0029] 2, in this embodiment, the injection range of the solidification material 30 in the depth direction is set to about 1 to 2 times the effective height of the steel sheet pile 10, thereby improving the bearing capacity of the steel sheet pile 10. However, the injection range does not necessarily have to be set to about 1 to 2 times the effective height of the steel sheet pile 10, and can be set to an injection range that provides the necessary bearing capacity, taking into account the soil quality and the peripheral friction of the steel sheet pile 10, etc.

[0030] In addition, in this embodiment, lean cement milk can be suitably used as the solidification material 30, but this is not limited to this, and any material that can harden in the ground and improve the bearing capacity of the steel sheet pile 10 can be used.

[0031] 4(a) shows a cross-sectional view of the solidification material injection pipe 20 when the steel sheet pile 10 is pressed into it, and FIG. 4(b) shows a cross-sectional view of the solidification material injection pipe 20 when the solidification material 30 is being injected. As shown in the figure, a stopper 21 that can move up and down is provided at the lower end of the solidification material injection pipe 20.

[0032] When the solidification material 30 is not injected during pressing-in of the steel sheet pile 10, the discharge port 22 is closed by the stopper 21 due to the sliding groove 24 and the sliding protrusion 23 that fits into the sliding groove 24. On the other hand, when the solidification material 30 is injected within the injection range of the solidification material 30, the stopper 21 moves downward due to the injection pressure of the solidification material 30, and the discharge port 22 is opened, allowing the solidification material 30 to be injected.

[0033] The discharge structure of the solidifying material 30 shown in FIG. 4 is merely an example, and the structure is not necessarily limited to that shown in the drawing.

[0034] The first embodiment of the present invention has been described above. According to the embodiment described above, it is possible to simply and reliably improve the tip bearing capacity and the circumferential frictional force by injecting the solidification material 30 into the gaps around the steel sheet pile 10 or in the disturbed ground. This is expected to reduce costs by reducing the embedded length and the construction period, and also makes it possible to use the steel sheet pile 10 as a permanent construction material.

[0035] (Second embodiment) Next, a second embodiment of the present invention will be described, with the explanation of the configuration common to the first embodiment being omitted.

[0036] The invention according to the second embodiment of the present invention is a method for pressing a steel sheet pile (10) comprising the steps of: placing a solidification material injection pipe (20) capable of injecting a solidification material (30) at least at the lower end of the steel sheet pile (10) in the depth direction of the steel sheet pile (10); pressing the steel sheet pile (10) with the solidification material injection pipe (20) placed therein into the ground; and injecting the solidification material (30) into the ground when the steel sheet pile (10) with the solidification material injection pipe (20) placed therein has been pressed into the ground and reaches a predetermined depth, wherein the step of injecting the solidification material (30) into the ground is characterized in that the injection of the solidification material (30) is started when the steel sheet pile (10) reaches a design depth.

[0037] The arrangement of the solidification material injection pipe 20 in the second embodiment is the same as that in the first embodiment. In the second embodiment, the steel sheet pile 10 in which the solidification material injection pipe 20 is arranged is pressed into the design depth as shown in Fig. 5 (see (A)). Then, when the steel sheet pile 10 in which the solidification material injection pipe 20 is arranged reaches the design depth, the injection of the solidification material 30 is started (see (B)), and the injection is stopped when a predetermined amount of the solidification material 30 has been injected (see (C)).

[0038] In this embodiment, as in the first embodiment, the depth direction injection range of the solidification material 30 is set to about 1 to 2 times the effective height of the steel sheet pile 10 to improve the bearing capacity of the steel sheet pile 10. However, the injection range does not necessarily have to be set to about 1 to 2 times the effective height of the steel sheet pile 10, and can be set to an injection range that provides the required bearing capacity, taking into account the soil quality, peripheral friction of the steel sheet pile 10, etc.

[0039] Depending on the soil quality of the ground, the solidification material 30 can be injected by permeation injection, but depending on the soil quality and construction conditions, fracturing injection by pressurized injection may also be used.

[0040] (Third embodiment) Next, a third embodiment of the present invention will be described, with the explanation of the configuration common to the first embodiment being omitted.

[0041] The invention according to the third embodiment of the present invention is a method for pressing a steel sheet pile (10) comprising the steps of: placing a solidification material injection pipe (20) capable of injecting a solidification material (30) at least at the lower end of the steel sheet pile (10) in the depth direction of the steel sheet pile (10); pressing the steel sheet pile (10) with the solidification material injection pipe (20) placed therein into the ground; and injecting the solidification material (30) into the ground when the steel sheet pile (10) with the solidification material injection pipe (20) placed therein has been pressed into the ground to a predetermined depth, wherein the step of injecting the solidification material (30) into the ground is characterized in that the steel sheet pile (10) is pressed into a depth deeper than the design depth of the steel sheet pile (10) to start injecting the solidification material (30) and then raising the steel sheet pile (10) to the design depth.

[0042] The arrangement of the solidification material injection pipe 20 in the third embodiment is the same as that in the first embodiment. In the third embodiment, the steel sheet pile 10 in which the solidification material injection pipe 20 is arranged is pressed into the pile to a depth deeper than the design depth as shown in Fig. 6 (see (A)). Then, the injection of the solidification material 30 is started (see (B)), and when a predetermined amount of the solidification material 30 has been injected, the steel sheet pile 10 is raised to the design depth (see (C)).

[0043] In this embodiment, as in the first embodiment, the depth direction injection range of the solidification material 30 is set to about 1 to 2 times the effective height of the steel sheet pile 10 to improve the bearing capacity of the steel sheet pile 10. However, the injection range does not necessarily have to be set to about 1 to 2 times the effective height of the steel sheet pile 10, and can be set to an injection range that provides the required bearing capacity, taking into account the soil quality, peripheral friction of the steel sheet pile 10, etc.

[0044] Depending on the soil quality of the ground, the solidification material 30 can be injected by permeation injection, but depending on the soil quality and construction conditions, fracturing injection by pressurized injection may also be used.

[0045] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described, with the explanation of the configuration common to the above-described embodiments being omitted.

[0046] A fourth embodiment of the present invention is a method for pressing in a steel sheet pile, the method comprising the steps of: arranging a solidification material injection pipe 20 capable of injecting a solidification material 30 at least at a lower end of the steel sheet pile 10 in a depth direction of the steel sheet pile; pressing the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein into the ground using an auger 5; injecting the solidification material 30 into the ground when the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein is pressed into the ground to a predetermined depth; and withdrawing the auger 5 while stirring after the steel sheet pile 10 reaches a design depth, wherein the step of injecting the solidification material 30 into the ground comprises pressing in the steel sheet pile 10 to the design depth while injecting the solidification material 30 between a design depth of the steel sheet pile 10 and a depth shallower than the design depth.

[0047] The arrangement of the solidification material injection pipe 20 in the fourth embodiment differs from that in the first embodiment, and is arranged on the auger head 6 side as shown by the dashed line in the lower cross-sectional view of Fig. 7. The steel sheet pile 10 with the solidification material injection pipe 20 arranged therein is pressed into the excavation site by the auger head 6 as shown in Fig. 7, and when the excavation site reaches a predetermined depth shallower than the design depth, the injection of the solidification material 30 begins (see Fig. 7(A)).

[0048] Thereafter, the steel sheet pile 10 is pressed into the design depth while mixing the solidification material 30 with the excavated soil (see (B) in the figure), and when the steel sheet pile 10 reaches the design depth and pressing in is complete, the injection of the solidification material 30 is also stopped and the auger 5 is pulled out while rotating in the reverse direction (see (C) in the figure). At this time, the solidification material 30 and the excavated soil are also mixed.

[0049] 7, the solidification material 30 is injected over a wider range in the depth direction than in the above-described embodiment. However, this is not necessarily limited to such a range. For example, as in the first embodiment, the injection range of the solidification material 30 in the depth direction may be about 1 to 2 times the effective height of the steel sheet pile 10, or may be an injection range that provides the necessary bearing capacity, taking into account the soil quality and the peripheral friction of the steel sheet pile 10.

[0050] (Fifth embodiment) Next, a fifth embodiment of the present invention will be described, with the explanation of the configuration common to the above-described embodiments being omitted.

[0051] The invention according to a fifth embodiment of the present invention includes a step of arranging a solidification material injection pipe 20 capable of injecting a solidification material at least at a lower end of the steel sheet pile 10 in a depth direction of the steel sheet pile 10, a step of pressing the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein into the ground using a water jet, and a step of injecting the solidification material 30 into the ground when the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein is pressed into the ground and reaches a predetermined depth, The step of pressing in the steel sheet pile (10) using a jet nozzle (20) in combination with a jet nozzle (20) includes pressing in the steel sheet pile (10) while discharging water to a predetermined depth shallower than the design depth of the steel sheet pile (10), and the step of injecting the solidification material (30) into the ground includes pressing in the steel sheet pile (10) to the design depth of the steel sheet pile (10) while injecting the solidification material (30) after the steel sheet pile reaches the predetermined depth, and the solidification material injection pipe (20) has a jet nozzle (9) and discharges the solidification material (30) and the water.

[0052] The fifth embodiment is a press-in method that partially applies the water jet combined press-in method shown in Fig. 8. That is, the water jet combined press-in method uses an apparatus that includes a water jet pump 7 that supplies water at a predetermined pressure, a jet reel (registered trademark) 8 that winds up a jet hose (registered trademark), a jet nozzle 9 that discharges water at the tip of the jet hose (registered trademark), a power unit 1 that serves as a drive source for the press-in machine 2, and the press-in machine 2 that presses in a steel sheet pile 10.

[0053] In the fifth embodiment, as shown in the lower cross-sectional view of Fig. 9, the arrangement of the solidification material injection pipe 20 is the same as in the first embodiment, but in this embodiment, a Jet Hose (registered trademark) and a jet nozzle 9 are used as the solidification material injection pipe 20. Then, the steel sheet pile 10 is pressed into the concrete while discharging water to a predetermined depth shallower than the design depth of the steel sheet pile 10, as shown in Fig. 9 (see illustration (A)).

[0054] Then, when the steel sheet pile 10 reaches the predetermined depth, the solidification material 30 is injected from the solidification material injection pipe 20 that had been discharging water until then, while the steel sheet pile 10 is pressed into the design depth of the steel sheet pile 10 (see (B) in the figure). When the steel sheet pile 10 has been pressed into the design depth of the steel sheet pile 10, the injection of the solidification material 30 is stopped (see (C) in the figure).

[0055] 9, as in the first embodiment, the injection range of the solidification material 30 in the depth direction is set to about 1 to 2 times the effective height of the steel sheet pile 10, thereby improving the bearing capacity of the steel sheet pile 10. However, the injection range does not necessarily have to be set to about 1 to 2 times the effective height of the steel sheet pile 10, and can be set to an injection range that provides the necessary bearing capacity, taking into account the soil quality and the peripheral friction of the steel sheet pile 10, etc.

[0056] In the above fifth embodiment, a jet hose (registered trademark) or jet nozzle 9 used in the water jet combined pressure injection method was used as the solidification material injection pipe 20, but this is not necessarily limited to this, and any suitable means can be used as long as it can pressurize and eject the solidification material 30 and water.

[0057] (Sixth embodiment) Next, a sixth embodiment of the present invention will be described, with the explanation of the configuration common to the above-described embodiments being omitted.

[0058] The invention according to the sixth embodiment of the present invention is a method for pressing a steel sheet pile, comprising the steps of: arranging a solidification material injection pipe 20 in the depth direction of the steel sheet pile 10, capable of injecting solidification material 30 only on the back side of the steel sheet pile 10; pressing the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein into the ground; and injecting the solidification material 30 into the ground when the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein has been pressed into the ground and reaches a predetermined depth, wherein the step of injecting the solidification material into the ground is characterized in that the injection of the solidification material 30 is started when the steel sheet pile 10 reaches a design depth.

[0059] The arrangement of the solidification material injection pipes 20 in the sixth embodiment differs from the previous embodiments in that the solidification material injection pipes 20 are arranged only on the back side of the steel sheet pile 10, as shown in the cross-sectional view of Figure 10. In addition, in the illustrated example, the solidification material injection pipes 20 are arranged to be relatively short in the depth direction in order to inject the solidification material 30 particularly into the upper part of the steel sheet pile 10.

[0060] It should be noted that the arrangement is not necessarily limited to placing a short solidification material injection pipe 20 in the depth direction. By placing the solidification material injection pipe 20 up to the vicinity of the lower end of the steel sheet pile 10 and injecting the solidification material 30 at an appropriate depth during the pressing-in of the steel sheet pile 10, it is possible to inject the solidification material 10 at any position within the range from the top to the bottom of the steel sheet pile 10.

[0061] In the sixth embodiment, the steel sheet pile 10 with the solidification material injection pipe 20 arranged therein is pressed into the pile to the design depth as shown in Fig. 10 (see (A)). Then, the solidification material 30 is injected into the back side of the steel sheet pile 10 (see (B)), and the injection of a predetermined amount of the solidification material 30 is completed (see (C)). Injecting the solidification material 30 as shown in Fig. 10 makes it possible to suppress the displacement of the steel sheet pile 10, particularly in the horizontal direction, and also contributes to improving the bearing capacity of the steel sheet pile 10 by improving the peripheral friction force.

[0062] In this embodiment, as in the first embodiment, the depth direction injection range of the solidification material 30 is set to about 1 to 2 times the effective height of the steel sheet pile 10. However, the injection range is not necessarily set to about 1 to 2 times the effective height of the steel sheet pile 10, and the injection range of the solidification material 30 can be set taking into consideration the effect of suppressing displacement of the steel sheet pile 10 in the horizontal direction, etc.

[0063] Depending on the soil quality of the ground, the solidification material 30 can be injected by permeation injection, but depending on the soil quality and construction conditions, fracturing injection by pressurized injection may also be used.

[0064] In addition, in the above sixth embodiment, the solidification material injection pipe 20 is arranged only on the back side of the steel sheet pile 10, but it is of course also possible to arrange the solidification material injection pipe 20 on the opposite belly side depending on the construction conditions and application.

[0065] (Another embodiment) Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments.

[0066] For example, in each embodiment, the locations and number of the solidification material injection pipes 20 are not necessarily limited to those in the above-described embodiments.

[0067] When injecting the solidification material 30, the pressure, flow rate, composition, etc. can be set appropriately depending on the geological conditions and construction conditions. When cement milk is used as the solidification material 30, mixing can be done by hand or in a plant, but is not particularly limited.

[0068] The specifications of the solidification material injection pipe 20 are not particularly limited, but it is also possible to use a Jet Hose (registered trademark) used in a water jet combined pressure-injection method.

[0069] The scope of the present invention is defined by the claims rather than the description of the above embodiments, and includes all modifications within the meaning and scope of the claims. Furthermore, the specific materials, dimensions, shapes, etc. described in the above embodiments can be modified within the scope of solving the problems of the present invention. [Explanation of symbols]

[0070] 1 Power Unit 2 Press-fitting machine 3 Auger drive unit 4 Casing 5 Auger 6 Auger Head 7. Water jet pump 8 Jet Reel (registered trademark) 9 Jet Nozzle 10 Steel sheet piles 11 Joint 20 Solidifying agent injection pipe 21 Stopper 22 Outlet 23 Sliding convex part 24 sliding groove 30 Solidification material

Claims

1. a step of disposing a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; Pressing the steel sheet pile with the solidification material injection pipe disposed thereon into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe disposed thereon is pressed into the ground and reaches a predetermined depth, The step of injecting the solidification material into the ground includes: While injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth, the steel sheet pile is moved up and down to press the steel sheet pile to the design depth. A method for pressing in a steel sheet pile, comprising:

2. a step of disposing a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; Pressing the steel sheet pile with the solidification material injection pipe disposed thereon into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe disposed thereon is pressed into the ground and reaches a predetermined depth, The step of injecting the solidification material into the ground includes: When the steel sheet pile reaches the design depth, the injection of the solidification material is started. A method for pressing in a steel sheet pile, comprising:

3. a step of disposing a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; Pressing the steel sheet pile with the solidification material injection pipe disposed thereon into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe disposed thereon is pressed into the ground and reaches a predetermined depth, The step of injecting the solidification material into the ground includes: The steel sheet pile is pressed into a depth deeper than the design depth of the steel sheet pile, and the injection of the solidification material is started, and the steel sheet pile is raised to the design depth. A method for pressing in a steel sheet pile, comprising:

4. a step of disposing a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; Press-fitting the steel sheet pile with the solidification material injection pipe disposed thereon into the ground using an auger; a step of injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe arranged thereon is pressed into the ground and reaches a predetermined depth; and a step of withdrawing the auger while stirring after the steel sheet pile reaches a design depth, The step of injecting the solidification material into the ground includes: The steel sheet pile is pressed into the design depth while injecting the solidification material between the design depth of the steel sheet pile and a depth shallower than the design depth. A method for pressing in a steel sheet pile, comprising:

5. a step of disposing a solidification material injection pipe capable of injecting a solidification material at least at a lower end of the steel sheet pile in a depth direction of the steel sheet pile; Pressuring the steel sheet pile with the solidification material injection pipe disposed thereon into the ground using a water jet in combination; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe disposed thereon is pressed into the ground and reaches a predetermined depth, The step of pressing the steel sheet pile into the ground using a water jet in combination, Pressing the steel sheet pile into the ground while discharging water to a predetermined depth that is shallower than the design depth of the steel sheet pile; The step of injecting the solidification material into the ground includes: After the steel sheet pile reaches the predetermined depth, the steel sheet pile is pressed into the design depth of the steel sheet pile while injecting the solidification material; The solidification material injection pipe has a jet nozzle and discharges the solidification material and the water. A method for pressing in a steel sheet pile, comprising:

6. The depth direction of the injection range of the solidification material is 1 to 2 times the effective height of the steel sheet pile.

6. A method for pressing in a steel sheet pile according to claim 1.

7. A plurality of the solidification material injection pipes are arranged, and the solidification material injection pipes are arranged on the front side and the back side of the steel sheet pile, respectively.

6. A method for pressing in a steel sheet pile according to claim 1, wherein the steel sheet pile is pressed into the press-fitting groove.

8. a step of arranging a solidification material injection pipe in a depth direction of the steel sheet pile, the solidification material being capable of being injected only onto the back side of the steel sheet pile; Pressing the steel sheet pile with the solidification material injection pipe disposed thereon into the ground; and injecting the solidification material into the ground when the steel sheet pile with the solidification material injection pipe disposed thereon is pressed into the ground and reaches a predetermined depth, The step of injecting the solidification material into the ground includes: When the steel sheet pile reaches the design depth, the injection of the solidification material is started. A method for pressing in a steel sheet pile, comprising:

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