Method for constructing fragile ground anchor using different diameter corrugated pipes

Abstract

The method of constructing an anchor for soft ground using a diagonal corrugated pipe according to the present invention comprises: a step of preparing a load-bearing body to be inserted into a bore hole in soft ground; a step of fixing a steel wire to the load-bearing body; a step of attaching a tip protection cap to the front of the load-bearing body; a step of attaching the front end of a large-diameter corrugated pipe to the tip protection cap so that the load-bearing body and the steel wire are wrapped by the large-diameter corrugated pipe; a step of attaching a diagonal coupler to the rear end of the large-diameter corrugated pipe; a step of attaching a small-diameter corrugated pipe to the rear end of the diagonal coupler so that the steel wire is wrapped by the small-diameter corrugated pipe at the rear of the large-diameter corrugated pipe; a step of attaching a tip protection device to the front of the tip protection cap so that the assembly of the earth anchor is completed; a step of forming a bore hole in soft ground; a step of inserting the assembled earth anchor into the bore hole; and a step of injecting grout into the interior of the bore hole. Accordingly, when drilling in areas where the soil is not solid, the drilled hole can be stably maintained by the corrugated pipe, and power consumption can be reduced as no additional pressure is required in addition to the pressure for grout injection when grout is injected into the drilled hole, and damage to the anchor can be prevented even in soil where the anchor may be easily damaged, such as backfill or boulder layers, and excellent performance in bulb formation is provided as the drilled hole remains intact even after the drilling casing is pulled out, and it is very advantageous for securing tensile strength as the anchor is wrapped in corrugated pipes of different diameters, and the grout injection time and drilling time can be shortened compared to other methods, and the removal of the earth anchor after bulb formation can be easily performed. This provides a method for constructing an anchor for soft ground using a corrugated pipe of different diameters.

Description

Technology Field

[0001] The present invention relates to a method for constructing an anchor for soft ground using a corrugated pipe of different diameters. More specifically, it relates to a method for constructing an anchor for soft ground using a corrugated pipe of different diameters, which allows the drilled hole to be stably maintained by the corrugated pipe when drilling in areas where the soil is not solid, reduces power consumption by eliminating the need for additional pressure in addition to the pressure for grout injection when injecting grout into the drilled hole, prevents damage to the anchor even in soils where the anchor can be easily damaged, such as backfill or boulder layers, and exhibits excellent performance in bulb formation because the drilled hole remains intact even after the drilling casing is pulled out, is very advantageous for securing tensile strength as the anchor is wrapped by corrugated pipes of different diameters, shortens the grout injection time and drilling time compared to other methods, and allows for easy removal of the earth anchor after bulb formation. Background Technology

[0002] Generally, the earth anchor method is a method of securing a retaining wall by drilling a hole in the wall, inserting reinforcing bars or PC steel wires, grouting the area with mortar, and creating an anchor on the back. Instead of using supports, a hole is drilled in the retaining wall with an earth drill, tension materials such as reinforcing bars or PC steel wires are inserted into the hole, the area is grouted with mortar to harden, and then tension is applied from the outside to anchor the PC steel wires or reinforcing bars.

[0003] However, when this earth anchor method is constructed in soil layers prone to loss of grout or low frictional resistance, the grout inside the anchor hole is lost, making it impossible to expect frictional force, or the low shear strength of the ground prevents the application of tensile force. Furthermore, if grout loss occurs, a significantly large amount of injection is required to fill surrounding voids in order to secure the necessary tensile force.

[0004] Recently, the anchor method has been proposed. The anchor method involves pressurizing and injecting grout into the anchor installed in the anchoring section to tightly bond the enlarged and cured anchoring bulb with the ground.

[0005] An example of an anchor device according to the prior art is disclosed in Korean Utility Model Registration No. 20-0426625 (registered on September 8, 2006, hereinafter referred to as 'Patent Document 1'), etc.

[0006] However, according to the conventional method of constructing anchors, there is a problem in that the bore hole may easily collapse when drilling into the ground in areas where the soil is not solid.

[0007] In addition, according to the conventional method of constructing an anchor, there is a problem in that a large amount of power may be required because, when injecting grout into the interior of the bore hole, an additional separate pressure must be applied in addition to the pressure for grout injection.

[0008] Meanwhile, according to the conventional method of installing anchors, there is a problem in that the anchor can be easily damaged in filled soil or boulder layers.

[0009] In addition, according to the conventional method of installing an anchor, there is a problem in that the bore hole cannot be maintained as is after the bore casing is pulled out, which may result in unfavorable bulb formation.

[0010] Meanwhile, according to the conventional method of constructing anchors, there are problems such as the difficulty in securing tensile strength, the increased time for grout injection and drilling, and the difficulty in removing the earth anchor after bulb formation. Prior art literature

[0011] Republic of Korea Utility Model Registration No. 20-0426625 (Registered on September 8, 2006) The problem to be solved

[0012] The objective of the present invention is to provide a method for constructing an anchor for soft ground using a corrugated pipe, which allows the bore hole to be stably maintained by the corrugated pipe when bore in areas where the soil is not solid, reduces power consumption by eliminating the need for additional pressure in addition to the pressure for grout injection when grout is injected into the bore hole, prevents damage to the anchor even in soil where the anchor can be easily damaged, such as backfill or boulder layers, exhibits excellent performance in bulb formation because the bore hole remains intact even after the bore casing is pulled out, is very advantageous for securing tensile strength as the anchor is wrapped in corrugated pipes of different diameters, shortens the grout injection time and bore time compared to other methods, and allows for easy removal of the earth anchor after bulb formation. means of solving the problem

[0013] To achieve the above objective, the method of constructing an anchor for soft ground using a diagonal corrugated pipe according to the present invention comprises: a step of preparing a load-bearing body to be inserted into a bore hole in soft ground; a step of fixing a steel wire to the load-bearing body; a step of attaching a tip protection cap to the front of the load-bearing body; a step of attaching the front end of a large-diameter corrugated pipe to the tip protection cap so that the load-bearing body and the steel wire are wrapped by the large-diameter corrugated pipe; a step of attaching a diagonal coupler to the rear end of the large-diameter corrugated pipe; a step of attaching a small-diameter corrugated pipe to the rear end of the diagonal coupler so that the steel wire is wrapped by the small-diameter corrugated pipe at the rear of the large-diameter corrugated pipe; a step of attaching a tip protection device to the front of the tip protection cap so that the assembly of the earth anchor is completed; a step of forming a bore hole in soft ground; a step of inserting the assembled earth anchor into the bore hole; and a step of injecting grout into the interior of the bore hole.

[0014] Here, in the step of coupling a diagonal coupler to the large-diameter corrugated tube, it is preferable that the diagonal coupler comprises a front connector provided in the shape of a corrugated tube at the front, corresponding to the shape of the outer surface of the large-diameter corrugated tube, and a rear connector integrally provided in the shape of a corrugated tube at the rear of the front connector, corresponding to the shape of the outer surface of the small-diameter corrugated tube.

[0015] In addition, it is preferable that connection guide protrusions be formed protrudingly on the inner surfaces of the front and rear connectors of the above-mentioned double-diameter coupler to guide connection with the large-diameter corrugated tube and connection with the small-diameter corrugated tube, respectively. Effects of the invention

[0016] According to the present invention, when drilling ground in areas where the soil is not solid, the drilled hole can be stably maintained by the corrugated pipe, and power consumption can be reduced by eliminating the need for additional pressure in addition to the pressure for grout injection when injecting grout into the drilled hole, and damage to the anchor can be prevented even in soil where the anchor may be easily damaged, such as filled soil or boulder layers, and excellent performance in bulb formation is provided by maintaining the drilled hole as it is even after the drilling casing is pulled out, and is very advantageous for securing tensile strength as the anchor is wrapped by corrugated pipes of different diameters, and the grout injection time and drilling time can be shortened compared to other methods, and the removal of the earth anchor after bulb formation can be easily performed. Brief explanation of the drawing

[0017] FIG. 1 is a construction flowchart of a construction method for an anchor for soft ground using a diagonal corrugated pipe according to the present invention. FIG. 2 is a drawing showing an earth anchor constructed by the construction method of an anchor for soft ground using a diagonal corrugated pipe according to the present invention. FIG. 3 is an enlarged view of the earth anchor of FIG. 2. FIG. 4 is a side view of a diagonal coupler according to the present invention, FIG. 5 is a perspective view of a digraph coupler according to the present invention, FIG. 6 is a side view of a birelational coupler according to another embodiment of the present invention, FIG. 7 is a drawing illustrating a state in which an earth anchor according to the present invention is provided in an equipment-removable manner. FIG. 8 is a drawing illustrating a state in which an earth anchor according to the present invention is provided in an embedded type. FIG. 9 is a drawing illustrating a state in which an earth anchor according to the present invention is provided in a manner that allows for manual removal. FIG. 10 is a diagram illustrating a mechanism in which the frictional resistance of an earth anchor increases and the tensile strength is improved after construction by the diagonal coupler according to the present invention. Specific details for implementing the invention

[0018] The following objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

[0019] Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete, and to ensure that the spirit of the invention is sufficiently conveyed to those skilled in the art.

[0020] The embodiments described and illustrated herein also include complementary embodiments.

[0021] In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. Components referred to as 'comprise' and / or 'comprising' as used in this specification do not exclude the presence or addition of one or more other components.

[0022] The present invention will be described in detail below with reference to the attached drawings.

[0023] FIG. 1 is a construction flowchart of a construction method for an anchor for soft ground using a diagonal corrugated pipe according to the present invention, FIG. 2 is a drawing showing an earth anchor constructed by the construction method for an anchor for soft ground using a diagonal corrugated pipe according to the present invention, FIG. 3 is an enlarged drawing of the earth anchor of FIG. 2, FIG. 4 is a side view of a diagonal coupler according to the present invention, FIG. 5 is a perspective view of a diagonal coupler according to the present invention, FIG. 6 is a side view of a diagonal coupler according to another embodiment of the present invention, FIG. 7 is a drawing showing an earth anchor according to the present invention provided in an equipment-removable type, FIG. 8 is a drawing showing an earth anchor according to the present invention provided in a buried type, and FIG. 9 is a drawing showing an earth anchor according to the present invention provided in a manual removal type.

[0024] A method for constructing an anchor for soft ground using a diagonal corrugated pipe according to the present invention comprises, as illustrated in FIG. 1, a step (S10) of preparing a load-bearing body (10) to be inserted into a bore hole (5) of soft ground; a step (S20) of fixing a steel wire (20) to the load-bearing body (10); a step (S30) of attaching a tip protection cap (30) to the front of the load-bearing body (10); a step (S40) of attaching the front end of a large-diameter corrugated pipe (40) to the tip protection cap (30) so that the load-bearing body (10) and the steel wire (20) are wrapped by the large-diameter corrugated pipe (40); a step (S50) of attaching a diagonal coupler (50) to the rear end of the large-diameter corrugated pipe (40); and a step of the steel wire (20) being connected to a small-diameter corrugated pipe (60) from the rear of the large-diameter corrugated pipe (40). The method includes the step (S60) of attaching a small diameter corrugated pipe (60) to the rear end of a double-diameter coupler (50) so as to be wrapped, the step (S70) of attaching a tip protection device (70) to the front of the tip protection cap (30) to complete the assembly of the earth anchor (100), the step (S80) of forming a bore hole (5) in the soft ground after the assembly of the earth anchor (100) is completed, the step (S90) of inserting the assembled earth anchor (100) into the bore hole (5), and the step (S100) of injecting grout into the bore hole (5).

[0025] Accordingly, when drilling ground in areas where the soil is not solid, the drilled hole can be stably maintained by the corrugated pipe; power consumption can be reduced as no additional pressure is required in addition to the pressure for grout injection when grout is injected into the drilled hole; damage to the anchor can be prevented even in soil where the anchor may be easily damaged, such as backfill or boulder layers; the drilled hole remains intact even after the drilling casing is pulled out, thereby exhibiting excellent performance in bulb formation; and since the anchor is wrapped in corrugated pipes of different diameters, it is very advantageous for securing tensile strength, the grout injection time and drilling time can be shortened compared to other methods, and the removal of the earth anchor after bulb formation can be easily performed. This provides a method for constructing an anchor for soft ground using a corrugated pipe of different diameters.

[0026] The above load-bearing body preparation step (S10) includes a step in which the load-bearing body (10) is arranged in a long longitudinal direction along the insertion direction of the steel wire (20) inserted into the inside of the drilled hole (5), as shown in FIG. 2.

[0027] Here, the load-bearing body (10) may be provided in two or more units at regular intervals along the insertion direction of the steel wire (20) inserted into the hole (5), and it is preferable that the steel wire (20) be wound in a 'U' shape along the groove in front of the load-bearing body (10) positioned at the bottom inside the hole (5).

[0028] As an embodiment of the present invention, the load-bearing body (10) prepared in the load-bearing body preparation step (S10) is preferably made of an alloy material such as tungsten, molybdenum, iron, or nickel, which has a relatively high specific gravity.

[0029] The above-mentioned steel wire fixing step (S20) includes a step of inserting the steel wire (20) into a steel wire gripping portion formed concavely on the outer surface of the load-bearing body (10) as shown in FIG. 3, so that the steel wire (20) is wound in a 'U' shape toward the front of the load-bearing body (10) which is positioned at the lowest part within the drilled hole (5) and extends toward the rear of the load-bearing body (10).

[0030] At this time, the steel wire (20) may be provided with elasticity such that one side is fixed to a device such as an external hydraulic cylinder, so that it stretches when pulled out and contracts again when released, and stores tensile force inside.

[0031] Here, the sum of the self-weights of the load-bearing body (10) and the steel wire (20) can be approximately 70 to 90 kg.

[0032] As an embodiment of the present invention, it is preferable that the earth anchor (100) be inserted into the interior of the drilled hole (5) at a speed of approximately 10 to 20 m / s.

[0033] The tip protection cap coupling step (S30) includes a step in which the tip protection cap (30) is coupled to wrap around the front of the load-bearing body (10) and the front of the large-diameter corrugated tube (40) between the front of the load-bearing body (10) and the tip protection device (70), as shown in FIGS. 2 and 3.

[0034] The above large-diameter corrugated tube coupling step (S40) includes the step of providing a large-diameter corrugated tube (40) having an outer diameter approximately 1.34 to 1.76 times larger than the outer diameter of a small-diameter corrugated tube (60), and the step of coupling the front end of the large-diameter corrugated tube (40) to a tip protection cap (30) so that the load-bearing body (10) and the steel wire (20) are wrapped by the large-diameter corrugated tube (40) in the front part of the earth anchor (100).

[0035] As shown in FIGS. 3 to 5, the diagonal coupler (50) in the step (S50) of coupling the diagonal coupler to the large-diameter corrugated tube includes a front connector (53) provided in the shape of a corrugated tube corresponding to the outer surface shape of the large-diameter corrugated tube (40) at the front, and a rear connector (55) provided integrally with the front connector (53) in the shape of a corrugated tube corresponding to the outer surface shape of the small-diameter corrugated tube (60) at the rear of the front connector (53).

[0036] Accordingly, by allowing the small diameter corrugated pipe (60) and the large diameter corrugated pipe (40) to be easily connected to each other through the two-diameter coupler (50), the earth anchor (100) is constructed in a form where it is wrapped by two-diameter corrugated pipes with different diameters, thereby expanding the contact area with the grout when grout is injected into the drilled hole (5) and making it very advantageous for securing tensile strength. Also, when the earth anchor (100) is constructed on soft ground where the soil is not solid, the drilled hole (5) can be maintained more stably by the large diameter corrugated pipe (40) and the small diameter corrugated pipe (60).

[0037] Meanwhile, as shown in FIG. 5, it is preferable to form a connection guide projection (51) protruding from the inner surface of the front connection port (53) and the rear connection port (55) of the diagonal coupler (50) to guide the connection with the large diameter corrugated tube (40) and the connection with the small diameter corrugated tube (60), respectively.

[0038] Here, it is preferable that a projection engaging groove corresponding to the connection guide projection (51) is formed on the outer surface of the large-diameter corrugated tube (40) and the outer surface of the small-diameter corrugated tube (60), respectively.

[0039] Accordingly, when connecting a large-diameter corrugated tube (40) to the front connection port (53) of the double-diameter coupler (50), the protrusion engaging groove of the large-diameter corrugated tube (40) is engaged with the connection guide protrusion (51), thereby facilitating the connection between the double-diameter coupler (50) and the large-diameter corrugated tube (40), and when connecting a small-diameter corrugated tube (60) to the rear connection port (55) of the double-diameter coupler (50), the protrusion engaging groove of the small-diameter corrugated tube (60) is engaged with the connection guide protrusion (51), thereby facilitating the connection between the double-diameter coupler (50) and the small-diameter corrugated tube (60).

[0040] Meanwhile, as another embodiment of the present invention, as shown in FIG. 6, in the step (S50) of coupling a double-diameter coupler to a large-diameter corrugated tube, a plurality of grout anchoring protrusions (52) made of carbon nanofibers may be formed on the outer surface of the double-diameter coupler (50) so as to resemble a plurality of fine hairs formed on the surface of a bulbous crop such as a sweet potato.

[0041] Accordingly, when grout is injected into the interior of the drilled hole (5) in step 100, a plurality of grout anchoring protrusions (52) formed on the outer surface of the diagonal coupler (50) are buried into the grout, and the area in contact with the grout is further expanded, thereby preventing the diagonal coupler (50), the large-diameter corrugated pipe (40), and the small-diameter corrugated pipe (60) from easily flowing within the grout by the grout anchoring protrusions (52) and ensuring stable anchoring.

[0042] Here, it is preferable that the grout anchoring projection (52) be provided with a plurality of carbon nanoprocessed bristles on the outer surface of the diagonal coupler (50) with a length of approximately 22 to 37 μm and a diameter of approximately 3.4 to 7.6 μm so that when the grout is injected, it adheres to the grout with van der Waals adhesive force inside the grout.

[0043] At this time, if the length of the grout fixing protrusion (52) is less than 22 μm, the strength of gripping the grout within the grout may decrease, and if it exceeds 37 μm, the length of the grout fixing protrusion (52) becomes too long and gets entangled with other grout fixing protrusions (52), and the strength of gripping the grout within the grout may decrease, and if the diameter of the grout fixing protrusion (52) is less than 3.4 μm, the strength of gripping the grout by the grout fixing protrusion (52) may decrease, and if it exceeds 7.6 μm, the van der Waals adhesion may decrease, and the strength of gripping the grout within the grout may decrease further.

[0044] Meanwhile, as another embodiment of the present invention, as shown in FIG. 6, a graphene coating layer (57) forming a two-dimensional structure with a single layer of carbon atoms may be formed on the inner surface of the bipolar coupler (50).

[0045] Accordingly, when grout is injected into the interior of the drilled hole (5) in step 100, the wear damage to the inner surface of the diagonal coupler (50) that comes into contact with the grout is prevented by the graphene coating layer (57), thereby further increasing the durability of the diagonal coupler (50) and the earth anchor (100) including the diagonal coupler (50) and effectively preventing permanent deformation.

[0046] The above small-diameter corrugated tube coupling step (S60) includes the step of providing a small-diameter corrugated tube (60) having an outer diameter approximately 1.34 to 1.76 times smaller than the outer diameter of a large-diameter corrugated tube (40), as shown in FIGS. 2 and 3, and the step of coupling the front end of the small-diameter corrugated tube (60) to a diagonal coupler (50) so that the load-bearing body (10) and the steel wire (20) are wrapped by the small-diameter corrugated tube (60) in the rear part of the earth anchor (100).

[0047] As an embodiment of the present invention, the large-diameter corrugated tube (40), the small-diameter corrugated tube (60), and the diagonal coupler (50) are preferably made of a synthetic resin material that is relatively hard yet has some elasticity.

[0048] Accordingly, the pack member surrounding the earth anchor (100) is provided to form a fixed corrugated tube shape rather than a shape that expands freely in a simple balloon shape, thereby minimizing deformation caused by grout pressure when grout is injected into the drilled hole (5) in step 100 and ensuring that the contact area with the grout is expanded uniformly, so that the anchoring strength and tensile strength within the ground can be further improved.

[0049] The above tip protection coupling step (S70) includes the step of coupling a tip protection (70) to the front of the tip protection cap (30), which supports the earth anchor (100) against the bottom of the hole (5) by being provided so that the earth anchor (100) does not directly touch the bottom of the hole (5) at the bottom of the earth anchor (100) inserted into the hole (5), as shown in FIG. 3.

[0050] Accordingly, when the earth anchor (100) according to the present invention is inserted into the interior of the drilled hole (5), safe construction is achieved without the earth anchor (100) being damaged or broken by the tip protection device (70), and even after construction, the earth anchor (100) can be firmly supported from the deep ground of the drilled hole (5).

[0051] At this time, it is preferable to form at least one grout hole in the tip protection device (70) so that when grout is injected into the interior of the small diameter corrugated pipe (60) and the large diameter corrugated pipe (40) through a grout injection hose, the grout is first filled into the interior of the large diameter corrugated pipe (40) and the small diameter corrugated pipe (60), and then flow out to the outside of the tip protection device (70) through the grout hole so that the grout is also filled into the exterior of the large diameter corrugated pipe (40) and the small diameter corrugated pipe (60) inside the drilled hole (5).

[0052] The above drilling hole formation step (S80) includes the step of forming a drilling hole (5) vertically in the ground through a ground drilling device.

[0053] The above earth anchor insertion step (S90) includes the step of inserting the earth anchor (100), which was assembled in step 70, into the interior of the drilled hole (5) formed in step 80.

[0054] The above grout injection step (S100) includes a step of injecting grout into the interior of the bore hole (5) after the above step 90 so that the interior of the bore hole (5) and the interiors of the large-diameter corrugated pipe (40) and the small-diameter corrugated pipe (60) are filled with grout.

[0055] Meanwhile, as illustrated in FIG. 7, when the earth anchor (100) according to the present invention is provided in a removable form, each steel wire (20) may be wound and fixed to each load-bearing body (10) provided at regular intervals inside a large-diameter corrugated pipe (40).

[0056] That is, when the earth anchor (100) according to the present invention is provided in a removable form, the steel wire (20) is pulled and removed using equipment such as a crane, thereby distributing the stress to each load-bearing body (10) and improving the reliability of anchoring and structural stability.

[0057] Meanwhile, as shown in FIG. 8, when the earth anchor (100) according to the present invention is provided in a buried type, the steel wires (20) may be provided so that they are bundled and fixed in one place in the middle inside the large-diameter corrugated pipe (40).

[0058] That is, when the earth anchor (100) according to the present invention is provided in a buried form, it is used to temporarily reinforce the ground, and although it is used for a relatively short period of time, it can also be left in the ground even after construction.

[0059] Meanwhile, as illustrated in FIG. 9, when the earth anchor (100) according to the present invention is provided in a manual removal type, the steel wire (20) is rotated by manual force to remove and re-bind the steel wire (20), thereby minimizing constraints on the construction space and minimizing interference with adjacent sites.

[0060] In addition, as illustrated in FIG. 10, the earth anchor (100) according to the present invention can be further improved in terms of tensile strength and anchoring efficiency in the ground by increasing frictional resistance through the coupler (50) when the earth anchor (100) is constructed and tensioned, as shown in FIG. 100, when grout is injected into the interior of the large-diameter corrugated pipe (40) and the small-diameter corrugated pipe (60) in step 100 and filled with the interior of the drilled hole (5), the large-diameter corrugated pipe (40), the diagonal coupler (50), and the small-diameter corrugated pipe (60), even if the outer diameter of the large-diameter corrugated pipe (40), the diagonal coupler (50), and the small-diameter corrugated pipe (60) increases only slightly.

[0061] Accordingly, in the conventional permanent anchor method, a bore hole had to be formed in the form of an enlargement in soft ground, so the time required for bore hole drilling was approximately 1 hour. However, according to the present invention, the time required for bore hole drilling can be reduced to approximately 20 minutes, thereby significantly reducing the time and cost required for bore hole drilling and the time and cost required for grout injection by more than 50%, and the amount of grout injected can also be significantly reduced, and work efficiency can be significantly improved.

[0062] Although the technical aspects have been described above and attached in the drawings, the technical concept of the present invention is for illustrative purposes only and is not intended to be limited. It will be understood that a person skilled in the art can make various modifications and changes to the technical concept of the present invention within the scope of the technical scope described in the claims below without departing from the technical scope. Explanation of the symbols

[0063] 100 : Earth Anchor 10 : Load-bearing Body 20 : Steel wire 30 : Tip protection cap 40 : Large diameter corrugated tube 50 : Double-diameter coupler 51: Connection guide projection 52: Grout anchoring projection 53: Front connection port 55: Rear connection port 60 : Small diameter corrugated tube 70 : Tip guard

Claims

Claim 1 A step (S10) of preparing a load-bearing body (10) to be inserted into a bore hole (5) in soft ground; a step (S20) of fixing a steel wire (20) to the load-bearing body (10); a step (S30) of attaching a tip protection cap (30) to the front of the load-bearing body (10); a step (S40) of attaching the front end of a large-diameter corrugated pipe (40) to the tip protection cap (30) so that the load-bearing body (10) and the steel wire (20) are wrapped by the large-diameter corrugated pipe (40); a step (S50) of attaching a diagonal coupler (50) to the rear end of the large-diameter corrugated pipe (40); a step (S60) of attaching a small-diameter corrugated pipe (60) to the rear end of the diagonal coupler (50) so that the steel wire (20) is wrapped by the small-diameter corrugated pipe (60) at the rear of the large-diameter corrugated pipe (40); the A step (S70) of completing the assembly of the earth anchor (100) by attaching a tip protection device (70) to the front of the tip protection cap (30); a step (S80) of forming a bore hole (5) in the soft ground; and a step (S90) of inserting the assembled earth anchor (100) into the bore hole (5). The method of constructing an anchor for soft ground using a corrugated pipe includes the step (S100) of injecting grout into the interior of the drilled hole (5); wherein the corrugated pipe coupler (50) in the step (S50) of connecting the corrugated pipe coupler to the large-diameter corrugated pipe comprises a front connection port (53) provided in the shape of a corrugated pipe at the front to correspond to the shape of the outer surface of the large-diameter corrugated pipe (40), and a rear connection port (55) provided integrally in the shape of a corrugated pipe at the rear of the front connection port (53) to correspond to the shape of the outer surface of the small-diameter corrugated pipe (60), and wherein a connection guide projection (51) is formed protruding from the inner surface of the front connection port (53) and the rear connection port (55) of the corrugated pipe coupler (50) to guide the connection with the large-diameter corrugated pipe (40) and the connection with the small-diameter corrugated pipe (60), respectively. Claim 2 delete Claim 3 delete

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