Multi-self-supported earth retaining wall construction method

Abstract

The present invention relates to a method for constructing an earth retaining wall comprising the steps of drilling the ground, vertically erecting a steel pipe in the drilled ground, inserting an anchor and a tube containing a first steel wire into the steel pipe, filling and compacting the inside of the steel pipe with an injection material, installing a cap on the upper part of the steel pipe, and tensioning the first steel wire to connect it to the cap. According to the present invention, a method for constructing a multi-self-supporting earth retaining wall that does not require a separate space necessary for installing a reinforcing material to support the wall can be provided.

Description

Technology Field

[0001] The present invention relates to a method for constructing a multi-self-supporting earth retaining wall, and more specifically, to a method for constructing a multi-self-supporting earth retaining wall that forms an earth retaining wall with excellent strength using ground soil and supports the earth retaining wall using anchors inserted vertically. Background Technology

[0002] As is well known, temporary earth retaining structures are temporary structures installed to prevent ground collapse during the construction of underground structures for buildings and civil engineering structures. They are constructed to resist lateral pressures, such as earth pressure and water pressure, acting on the earth retaining walls, and to protect surrounding ground from settlement and adjacent structures.

[0003] These temporary earth retaining structures include earth retaining walls and various shoring works; the earth retaining walls are installed on the excavation surface to prevent soil collapse during excavation work, and the shoring works are structures that support the earth retaining walls.

[0004] Temporary earth retaining wall construction methods are classified according to the type of earth retaining wall into sheet pile, steel sheet pile, continuous row, and underground continuous wall methods, and the continuous row method is broadly divided into the SCW method and the CIP method.

[0005] First, the SCW (soil cement wall) method is a construction method that forms an earth retaining wall by excavating and penetrating the ground using an auger screw, injecting cement milk injection material at a predetermined pressure through the hollow rod of the auger screw, and mixing it with the ground soil using mixing blades provided around the hollow rod to create soil concrete. H-piles, steel pipes, and steel sheet piles can be inserted.

[0006] Next, the CIP (cast-in-pile) method is a method of drilling the ground using the auger screw of a drilling machine. Drilling is performed while injecting a stabilizing fluid to protect the borehole wall. After drilling, reinforcing bars are inserted and concrete is poured to create a single cast-in-place concrete pile, and this is constructed continuously to form a retaining wall.

[0007] However, the aforementioned SCW and CIP methods had the problem of leading to an increase in material costs because they required the injection of grout such as cement milk or concrete.

[0008] In addition, the aforementioned SCW method uses a large drilling machine equipped with a 3-axis auger screw, but since such a large drilling machine cannot enter a narrow site, there was a problem in that the retaining wall constructed by the SCW method could not be formed vertically and straight.

[0009] Temporary earth retaining wall construction methods are classified into strut, earth anchor, raker, and soil nailing methods depending on the support type. The strut and raker methods require the installation of reinforcing materials—struts and rakers—to support the earth retaining wall, but they present the problem of requiring separate space for installation. The earth anchor and soil nailing methods also present the problem of requiring separate space beyond the area occupied by the earth retaining wall, as anchors and nails must be inserted diagonally as reinforcing materials. Furthermore, there is the problem that it is cumbersome because the reinforcing materials installed to support the earth retaining wall are generally removed later. The problem to be solved

[0010] The objective of the present invention, devised to solve the aforementioned problems, is to provide a construction method for a multi-self-supporting earth retaining wall that creates an earth retaining wall with excellent strength even when using ground soil.

[0011] In addition, another objective of the present invention is to provide a method for constructing a multi-self-supporting earth retaining wall that does not require a separate space for installing reinforcing materials to support the earth retaining wall. means of solving the problem

[0012] According to the features of the present invention for achieving the above-mentioned purpose, the present invention comprises a method for constructing a multi-self-supporting earth retaining wall, comprising the steps of: drilling the ground; erecting a steel pipe vertically in the drilled ground; inserting an anchor and a tube containing a first steel wire into the steel pipe; filling and compacting the inside of the steel pipe with soil; installing a cap on the upper part of the steel pipe; and tensioning the first steel wire to connect it to the cap.

[0013] In addition, the method for constructing a multi-self-supporting earth retaining wall according to the present invention may further include the steps of separating the cap and pulling out the steel pipe; and grouting using the tube.

[0014] In addition, the method for constructing a multi-self-supporting earth retaining wall according to the present invention may further include the step of removing an anchor including the first steel wire before grouting using the tube.

[0015] In addition, the method for constructing a multi-self-supporting earth retaining wall according to the present invention may further include the step of connecting a tie beam to the steel pipe; and the anchor may further include a second steel wire and the second steel wire may further include the step of fixing the tie beam.

[0016] In addition, the above cap may be an H-beam.

[0017] Another method for constructing a multi-self-supporting earth retaining wall according to the present invention may include the steps of: drilling the ground; placing a first cap fitted with a steel rod onto a steel pipe so that the first cap faces downward toward the bottom of the drilled ground and erecting the steel pipe vertically in the drilled ground; filling and compacting the inside of the steel pipe with soil; installing a second cap on the top of the steel pipe; and subsequently, removing the second cap and removing the steel rod and the steel pipe. Effects of the invention

[0018] According to the present invention as described above, a method for constructing a multi-self-supporting earth retaining wall can be provided, which creates an earth retaining wall with excellent strength even when using ground soil.

[0019] In addition, according to the present invention, a method for constructing a multi-self-supporting earth retaining wall that does not require a separate space for installing reinforcing materials to support the wall can be provided.

[0020] In addition, according to the present invention, the anchor can be inserted vertically so that the anchor does not need to be removed. Brief explanation of the drawing

[0021] FIG. 1 is a flowchart showing a construction method of a multi-self-supporting earth retaining wall according to an embodiment of the present invention. Figure 2 is a drawing showing the drilled ground after step S110 of Figure 1. Figures 3a and 3b show a side view and a top view of a steel pipe standing vertically in the drilled ground after step S120 of Figure 1. FIGS. 4a and FIGS. 4b show a side view and a top view, respectively, of an anchor and a tube including a first steel wire inserted after step S130 of FIG. 1. Figures 5a and 5b show a side view and a top view of the inside of the steel pipe filled with soil after step S140 of Figure 1. FIG. 6 is a side view showing the first steel wire fixed to the cap on the upper part of the steel pipe, including the ground. Figure 7 is a perspective view of a steel pipe including a cap. FIG. 8 shows another embodiment in which the second steel wire is fixed to the tie beam. FIG. 9 is a drawing showing the use of steel pipes of different shapes in a construction method of a multi-self-supporting earth retaining wall according to one embodiment of the present invention. Specific details for implementing the invention

[0022] In the following, embodiments related to the present invention are illustrated in the drawings and described in detail through the detailed description. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention.

[0023] In describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by such terms.

[0025] Hereinafter, a construction method for a multi-self-supporting earth retaining wall according to an embodiment of the present invention will be described with reference to the drawings related to the embodiments of the present invention.

[0026] FIG. 1 is a flowchart showing a construction method for a multi-self-supporting earth retaining wall according to an embodiment of the present invention. The construction method for a multi-self-supporting earth retaining wall includes the steps of drilling the ground (S110), vertically erecting a steel pipe in the drilled ground (S120), inserting an anchor and a tube containing a first steel wire into the steel pipe (S130), filling the inside of the steel pipe with soil and compacting it (S140), installing a cap on the top of the steel pipe (S150), and tensioning the first steel wire to connect it to the cap (S160).

[0027] Referring to FIG. 1, the step of drilling the ground (S110) is a step of drilling the ground (E) in the area where the earth retaining wall is to be constructed, and a drilling machine (or a drilling rig, earth auger, etc.) may be used to drill the ground. FIG. 2 shows the drilled ground after step S110. According to one embodiment, before drilling the ground (E), the ground may first be leveled and the area to be drilled may be trenched.

[0028] The next step, the step of vertically erecting steel pipes in the drilled ground (S120), is a step of vertically erecting multiple steel pipes (210) so that they are aligned along the area where the earth retaining wall is to be constructed. FIGS. 3a and 3b are a side view and a top view, respectively, of steel pipes (210) vertically erected in the drilled ground. The steel pipes (210) are circular pipes made of steel, with a diameter of 508 mm or 406 mm and a length of 10 to 15 m. Alternatively, as shown in FIG. 3b, the steel pipes (210) may have a connecting part (215) configured in the form of a steel sheet pile so that they can maintain a state of being firmly connected to other steel pipes. In addition, steel pipes (210) of various shapes may be used, and the shape of the steel pipes is not limited.

[0029] According to another embodiment, the steel pipe can be erected on the ground using a vibration method without drilling into the ground.

[0030] Next, the step (S130) of inserting an anchor containing a first steel wire and a tube pipe into the steel pipe involves vertically erecting the anchor (230) containing the first steel wire and the tube pipe (220) within the steel pipe (210). The anchor (230) containing the first steel wire and the tube pipe (220) may be inserted to allow the earth retaining wall to resist lateral pressures such as earth pressure and water pressure. Specifically, the anchor (230) containing the first steel wire is a tension member and is inserted to resist pressure acting on the earth retaining wall together with the injection material subsequently injected, and the tube pipe (220) is inserted to inject the injection material required for grouting. According to one embodiment, the order of inserting the anchor (230) containing the first steel wire and the tube pipe (220) is not limited, and the tube pipe (220) and the anchor (230) containing the first steel wire may be inserted simultaneously. According to one embodiment, an anchor (230) and / or tube (220) including a first steel wire can be inserted into the rock ground (R).

[0031] FIGS. 4a and FIGS. 4b are a side view and a top view showing an anchor (230) including a first steel wire inserted after step S130 and a tube (220). Referring to FIGS. 4a and FIGS. 4b, the tube (220) is inserted into the center of the steel pipe (210), and the anchor (230) including the first steel wire can be inserted at a distance from the tube (220).

[0032] According to one embodiment, the tube (220) is a PVC (polyvinyl chloride) pipe, and the diameter (pi) may be 25 mm, but is not limited thereto.

[0033] Next, the step of filling and compacting the inside of the steel pipe with soil (S140) is a step of injecting and compacting soil into the inside of the steel pipe (210). The soil (G) may preferably be ground soil, but is not limited thereto. FIGS. 5a and 5b show a side view and a top view of the inside of the steel pipe (210) filled with soil.

[0034] Next, the step of installing a cap on the upper part of the steel pipe (S150) is to install a cap (240) to hold the upper part of the steel pipe (210). The cap (240) may be an H-beam, but is not limited thereto.

[0035] Next, the step (S160) of tensioning the first steel wire to connect it to the cap is a step of fixing the first steel wire to the cap (240) using a fixing means (not shown). For better understanding, FIGS. 6 and FIGS. 7 show the state in which the first steel wire is fixed to the cap (240) installed on the upper part of the steel pipe (210). Specifically, FIG. 6 is a side view including the ground showing the first steel wire fixed to the cap on the upper part of the steel pipe (210), and FIG. 7 is a perspective view of the steel pipe (210) including the cap (240).

[0036] According to one embodiment, the construction method of a multi-self-supporting earth retaining wall according to the present invention may further include the steps of separating a cap and pulling out a steel pipe, and grouting using a tube. The grouting step is a step for reinforcing the ground and may be a step of filling internal voids by injecting cement milk, which is a mixture of cement, sand, and water. When cement milk is injected between the ground soil injected inside the steel pipe (210) and cured, the strength of the earth retaining wall is improved and material costs can be reduced. These steps may be performed when the construction of the structure has progressed beyond a certain stage.

[0037] According to one embodiment, the construction method of a multi-self-supporting earth retaining wall according to the present invention may remove an anchor including a first steel wire before grouting using a tube. Although the anchor including the first steel wire does not necessarily have to be removed, it may be removed, and if removed, the removed space may be filled with an injection material by grouting.

[0038] According to one embodiment, the construction method of a multi-self-supporting earth retaining wall according to the present invention may further include the step of connecting a tie beam to a steel pipe. When a plurality of steel pipes are aligned, the tie beam can be connected by bolting along the inner outer surface of the plurality of steel pipes. By connecting the plurality of steel pipes with a tie beam, the earth pressure acting on the steel pipes can be evenly distributed. According to one embodiment, the tie beam can be implemented using an H-shaped steel or an I-shaped steel used as structural rolled steel.

[0039] According to one embodiment, the anchor (260) may include a second steel wire (262) in addition to the first steel wire (261), and the second steel wire (262) may be connected (or fixed) to the tie beam (250) to support the earth retaining wall. FIG. 8 shows another embodiment in which the second steel wire (262) is tensioned and fixed to the tie beam (250). Referring to FIG. 8, the tie beam (250) is connected to one side of the steel pipe (210), and the second steel wire (262) may be connected to and fixed to the tie beam (250). According to one embodiment, the second steel wire (262) may be fixed to the tie beam (250) using a fixing member (not shown). Here, the first steel wire and the second steel wire are described as each being a single steel wire, but they may be composed of multiple steel wires, and the number of steel wires included in the anchor may not be limited. Additionally, according to one embodiment, an anchor including a second steel wire in addition to a first steel wire may be installed only in some steel pipes. For example, an anchor including the first steel wire may be inserted (or installed) in odd-numbered steel pipes, and an anchor including both the first and second steel wires may be inserted in even-numbered steel pipes.

[0041] FIG. 9 is a drawing showing a steel pipe of a different shape used in a construction method of a multi-self-supporting earth retaining wall according to one embodiment of the present invention.

[0042] According to one embodiment, steel rods may be used instead of steel wires and tubes in the construction method of a multi-self-supporting earth retaining wall. Referring to FIG. 9, after drilling the ground, a steel pipe may be erected in the drilled ground. At this time, the steel pipe (210) may be inserted at least 1,000 mm deeper from the bottom of the excavation (920).

[0043] Referring to FIG. 9, the lower part of the steel pipe (210) is covered with a cap (241), and the steel rod (910) can be fitted into the cap (241). For example, the steel rod (910) can be fitted into the cap (241) and fixed with a fixing bolt and nut. According to one embodiment, the diameter of the steel rod (910) may be 36 to 40 mm, and the cap (241) may have a circumference of 550 mm and a thickness of 20 T.

[0044] Subsequently, according to the construction method of the multi-self-supporting earth retaining wall, the steel pipe (210) is filled with soil, and a cap (242) may be installed on the upper part of the steel pipe (210), and may be fixedly installed on the upper part of the steel pipe (210) in the same manner as the cap (241) installed on the lower part. The cap (242) installed on the upper part of the steel pipe (210) and the cap (241) placed on the lower part may be the same cap, but are not limited thereto. According to one embodiment, the upper part of the steel pipe (210) may be the excavation back surface (930).

[0045] Afterward, according to the construction method of the multi-self-supporting earth retaining wall, the cap (242) installed on the upper part of the steel pipe (210) can be removed, and the steel rod (910) and the steel pipe (210) can also be removed. According to one embodiment, the steel rod (910) may be a spiral steel rod, in which case the steel rod (910) can be removed by rotating it. The removed cap (242), steel rod (910), and steel pipe (210) can be reused.

[0046] A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0047] 210: Steel pipe 215: Connecting part 220: Tube 230: Anchor including the first steel wire 240, 241, 242: Cap 250: Belt 260: Second wire 910: Gangbong 920: Excavation bottom 930: Excavation Backfill E: Ground R: Rock G: Soil

Claims

Claim 1 A method for constructing a multi-self-supporting earth retaining wall, comprising: a step of drilling the ground; a step of vertically erecting a plurality of steel pipes in the drilled ground; a step of inserting an anchor containing only a first steel wire and a tube into the odd-numbered steel pipes among the plurality of steel pipes, and inserting an anchor containing both a first steel wire and a second steel wire into the even-numbered steel pipes among the plurality of steel pipes; a step of filling and compacting the inside of the steel pipes with soil; a step of installing a cap on the upper part of the steel pipes; a step of connecting a tie beam to the steel pipes; and a step of tensioning the first steel wire to connect it to the cap and tensioning the second steel wire to connect it to the tie beam; wherein the steel pipes are provided with a fastening part in the form of a sheet pile that is combined with other adjacent steel pipes; a step of separating the cap and pulling out the steel pipes; and a step of grouting using the tube pipes; further comprising a step of removing the anchors before grouting using the tube pipes; and wherein the caps are H-beams. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete

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