Earth retaining structure and method for constructing the earth retaining structure

Abstract

To provide an earth retaining structure supporting an earth-retaining wall from the rear face, even in a narrow site.SOLUTION: An earth retaining structure has an earth-retaining wall W having an excavation space in front of it, a stay pile 1 provided on a rear face of the earth-retaining wall W, and a tendon 2 connecting the earth-retaining wall W to the stay pile 1. The stay pile 1 has a lower pulley 5 provided on the front side in the ground, and the tendon 2 is engaged with the lower pulley 5 and fixes both ends to a pedestal 6 provided on the front face of the earth-retaining wall W.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an earth retaining structure and a method for constructing an earth retaining structure. [Background technology]

[0002] When cutting roots to construct the basement or foundations of a building, retaining walls are necessary to prevent the surrounding ground from collapsing. One method of supporting retaining walls is to place struts between opposing retaining walls. However, this method requires a longer construction period and higher costs because the presence of the struts restricts other work in addition to the process of placing the struts.

[0003] The following two methods are particularly well known as methods for supporting retaining walls without using struts. (1) Tie-back anchor method Patent Document 1 describes a tie-back anchor method in which a retaining wall, the front of which is excavated, is supported by backing piles installed on the rear side and tension members installed near the ground surface, as shown in Figure 23. (2) Ground anchor method Patent Document 2 describes a ground anchor method in which support is provided by ground anchors installed diagonally downward from a retaining wall, as shown in FIG. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-162266 A [Patent Document 2] Japanese Unexamined Patent Publication No. 59-173422 Summary of the Invention [Problem to be solved by the invention]

[0005] In the tieback anchor method, the tendons are installed close to the ground surface, so in order for the support piles to function effectively, they must be located outside the main sliding line extending upward from the bottom of the excavation. Therefore, the distance L between the retaining wall and the supporting piles is 1 The distance from the wale to the bottom of the excavation must be at least H, and there must be sufficient space to drive back piles into the rear of the retaining wall.

[0006] In the ground anchor method, the tension material is installed by drilling holes from the surface of the earth retaining wall, so holes must be drilled diagonally downward. In addition, because the ground anchor is fixed by the frictional resistance between the anchor and the ground, it is necessary to provide an anchor of a certain length or more in the anchor layer where the frictional resistance is large, so there must be sufficient space on the rear side of the earth retaining wall to install the ground anchor. However, these construction methods are often difficult to implement, especially in urban areas, where space is limited.

[0007] An object of the present invention is to provide an earth retaining structure and a method for constructing an earth retaining structure that supports an earth retaining wall from the rear even on a narrow site. [Means for solving the problem]

[0008] The earth retaining structure of the present invention, which has been made to achieve the above-mentioned object, comprises an earth retaining wall that provides an excavation space on its front side, a support pile provided on the rear side of the earth retaining wall, and a tension member that connects the earth retaining wall and the support pile, the support pile having a lower pulley provided on its front side in the ground, and the tension member engaging with the lower pulley and having both ends fixed to a pedestal provided on the front side of the earth retaining wall. The retaining pile is configured by connecting an upper retaining pile and a lower retaining pile made of H-shaped steel via an intermediate connecting plate, the lower retaining pile is arranged so that its weak axis is approximately perpendicular to the retaining wall, the upper retaining pile is arranged so that its strong axis is approximately perpendicular to the retaining wall, and the lower pulley is fixed near the lower end of the upper retaining pile. do. Also, The structure comprises a retaining wall that provides an excavation space at its front side, a support pile provided at the rear side of the retaining wall, and a tension member that connects the retaining wall and the support pile, the support pile having a lower pulley provided at its front side in the ground, one end of the tension member being fixed to a fixing part provided at the top of the support pile, the tension member extending downward from the fixing part along the support pile, and the other end of the tension member being fixed to a base provided at the front side of the retaining wall by engaging with the lower pulley. The support pile is constructed by connecting an upper support pile and a lower support pile made of H-shaped steel via an intermediate connecting plate, the lower support pile is arranged so that its weak axis is approximately perpendicular to the retaining wall, the upper support pile is arranged so that its strong axis is approximately perpendicular to the retaining wall, and the lower pulley is fixed near the lower end of the upper support pile. . Two lower pulleys may be provided in parallel, and the two tendons may be engaged with either of the two lower pulleys and fixed to either of two pedestals provided at different heights on the front surface of the retaining wall. 。

[0009] The method for constructing an earth retaining structure of the present invention includes a wire engaging step of providing a wire that is arranged parallel to the earth retaining pile and that spans between the lower pulley and the upper pulley and engages with the lower pulley and the upper pulley, and a wire engaging step of erecting the earth retaining pile into a drilled hole filled with filler, with the other end of the pile facing downward and both ends of the wire protruding from the ground surface, facing the direction in which the earth retaining wall will be constructed, and a wire connecting step of connecting both ends of the wire in a state of engagement with a wire rotating device arranged on the ground surface. the wire rotating device in a cutting process, in which the wire is rotated lengthwise while engaged with the upper pulley and the lower pulley by the wire rotating device, and the wire is used to cut into the ground from the back pile in the direction of the retaining wall; the wire tensioning process, in which the wire is tensioned in a substantially triangular shape with the upper pulley, the lower pulley, and the wire rotating device as vertices, and then the engagement between the upper pulley and the wire is released and the exposed length of the wire is shortened by the wire rotating device, thereby tensioning the wire between the lower pulley and the wire rotating device; and the tensioning material tensioning process, in which the connection of the wire is released, the wire is used as a tensioning material, and the tensioning material is tensioned and fixed to a base provided on the retaining wall. The tensioning process may include a tensioning process for disconnecting the wire and connecting a new tensioning material to the end of the wire, a connected tensioning material retraction process for using the wire rotating device to retract the tensioning material connected to the wire into the ground between the lower pulley and the wire rotating device, and a connected tensioning material tensioning process for tensioning the tensioning material and fixing it to a base provided on the retaining wall. A wire engagement process is performed to connect a support pile having a lower pulley installed midway in the length direction and an upper pulley installed near one end facing the same direction as the lower pulley, and a wire is arranged parallel to the support pile across the lower pulley and the upper pulley to engage with the lower pulley and the upper pulley; a support pile installation process is performed to connect the support pile with the other end facing downward and both ends of the wire exposed at the ground surface, and to install the lower pulley and the upper pulley in a drilled hole filled with filler, facing in the direction of constructing the retaining wall; and a wire installation process is performed to connect both ends of the wire while engaged with a wire rotation device installed at the ground surface. The method may include an ear connecting process, a cutting process in which the wire is rotated lengthwise while engaged with the upper pulley and the lower pulley by the wire rotating device, and the wire is used to cut into the ground from the retaining pile toward the retaining wall, a wire tensioning process in which the wire is tensioned in an approximately triangular shape with the upper pulley, the lower pulley and the wire rotating device as vertices, and a tensioning member tensioning process in which the wire is released, the wire is used as a tensioning member, one end of which is fixed to a fixing portion provided on the upper part of the retaining pile, and the tensioning member is tensioned and the other end is fixed to a base provided on the retaining wall. The tendon tensioning process may include a tendon connecting process of disconnecting the wire and connecting a new tendon to the end of the wire, a connected tendon retracting process of using the wire rotating device to pull the tendon connected to the wire into the ground between the lower pulley and the wire rotating device, and a connected tendon tensioning process of fixing one end of the tendon to a fixing portion provided on the back pile, tensioning the tendon and fixing the other end to a base provided on the retaining wall. The wire rotating device is movable on a rail installed on the ground surface between the support pile and the retaining wall. may be also possible. The wire rotating device may be fixed to the ground surface on the opposite side of the pier relative to the location where the retaining wall is to be constructed. Two upper pulleys and two lower pulleys are provided in parallel, and in the wire engagement process, the two wires are engaged with either the upper pulley or the lower pulley, respectively, and in the pile erection process, the pile is erected with both ends of the two wires protruding from the ground surface, and the wire connecting process, the cutting process, the wire tensioning process, and the tensioning material tensioning process are performed using one of the wires, and the wire connecting process, the cutting process, the wire tensioning process, and the tensioning material tensioning process are performed using the other wire. Effect of the Invention

[0010] The present invention provides at least one of the following effects by solving the above-mentioned problems. (1) The tendons engage with the lower pulleys attached to the retaining piles in the ground and are tensioned diagonally upward to secure the retaining wall, so that the retaining piles are not affected by deformation of the retaining wall even if they are located close to the retaining wall. (2) Since the retaining piles may be located close to the earth retaining wall, there is no need for struts to secure the earth retaining wall even on a narrow site. (3) Since no bracing beams are used, construction time is short and costs are low. (4) Since the wire is rotated to cut into the ground, there is no need to drill holes to place the tendons. [Brief description of the drawings]

[0011] [Figure 1] Explanatory diagram of the retaining structure of the first embodiment [Diagram 2] An explanatory diagram of the retaining pile of the earth retaining structure of the first embodiment [Diagram 3] (a) Cross section AA of Figure 2 (b) Cross section BB of Figure 2 [Figure 4] Explanatory diagram of the construction method of the earth retaining structure of Example 1 (1) [Diagram 5] Explanatory diagram (2) of the construction method of the earth retaining structure of Example 1 [Figure 6] Explanatory diagram (3) of the construction method of the earth retaining structure of Example 1 [Figure 7] Explanatory diagram (4) of the construction method of the earth retaining structure of Example 1 [Figure 8] Explanatory diagram of the construction method of the earth retaining structure of Example 1 (5) [Figure 9] Explanatory diagram (6) of the construction method of the earth retaining structure of Example 1 [Figure 10] Explanatory diagram (1) of the construction method of the earth retaining structure of Example 2 [Figure 11] Explanatory diagram (2) of the construction method of the earth retaining structure of Example 2 [Figure 12] Explanatory diagram (3) of the construction method of the earth retaining structure of Example 2 [Figure 13] FIG. 11 is an explanatory diagram of the arrangement of the lower pulley in the third embodiment. [Figure 14] Explanatory diagram of the retaining structure of Example 3 [Figure 15] Explanatory diagram of the retaining structure of Example 4 [Figure 16] Explanatory diagram of the retaining pile of the earth retaining structure of Example 4 [Figure 17] (a) AA cross section of Figure 16 (b) BB cross section of Figure 16 [Figure 18] Explanatory diagram (1) of the construction method of the earth retaining structure of Example 4 [Figure 19] Explanatory diagram (2) of the construction method of the earth retaining structure of Example 4 [Figure 20] Explanatory diagram (3) of the construction method of the earth retaining structure of Example 4 [Figure 21] Explanatory diagram (4) of the construction method of the earth retaining structure of Example 4 [Figure 22] Explanatory diagram (5) of the construction method of the earth retaining structure of Example 4 [Diagram 23] Diagram of conventional earth retaining construction method (1) [Figure 24] Diagram of conventional earth retaining construction method (2) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The earth retaining structure and the method of constructing the earth retaining structure of the present invention will be described in detail below with reference to the drawings. In this description, the expressions relating to directions such as front-back, up-down, etc. are defined based on the earth retaining wall W and the retaining pile 1, the front means the direction from the retaining pile 1 toward the earth retaining wall W, the up-down direction means the height direction of the earth retaining wall W and the retaining pile 1, and the lateral direction means the direction perpendicular to the front direction and the up-down direction.

[0013] [Example 1] (1) Structure of the earth retaining structure The earth retaining structure of the present invention supports an earth retaining wall W, the front of which is excavated, by connecting it to a retaining pile 1 provided on the rear side by a tendon 2 engaged with the retaining wall W (Fig. 1). The retaining wall W can be a conventionally known type of retaining wall, such as a parent pile horizontal sheet pile wall made by driving H-shaped steel piles into the ground at regular intervals and inserting horizontal sheet piles between them, a steel sheet pile wall made by driving U-shaped steel sheet piles into the ground, or a soil cement column wall made by creating a series of columns made of soil cement in the ground to create a wall.

[0014] (2) Support piles The support pile 1 is constructed by rigidly connecting an upper support pile 1a and a lower support pile 1b via an intermediate connecting plate 1c. Both the upper support pile 1a and the lower support pile 1b are H-shaped steel, with the upper support pile 1a's strong axis facing the retaining wall W, while the lower support pile 1b is rotated 90° relative to the upper support pile 1a and its weak axis facing the retaining wall W (Figures 2 and 3). The lower end of the upper support pile 1a and the upper end of the lower support pile 1b are connected to an intermediate connecting plate 1c by welding or the like. The periphery of the support pile 1 is fixed with a filling material 3 such as cement milk. An upper pulley 4 is fixed to the upper end of the upper support pile 1a that is exposed above ground level, and a lower pulley 5 is fixed to the lower end of the upper support pile 1b. The upper pulley 4 is fixed to the front side of the web of the upper backing pile 1a, on the side of the retaining wall W. The lower pulley 5 cuts out a notch in the web of the upper backing pile 1a, and the rotating shaft is fixed between the cut out webs. In addition, a guide pulley 51 is provided above the lower pulley 5, in order to guide the wire engaged with the upper pulley 4 provided on the front side of the web to the rear side of the web and engage with the lower pulley 5. The upper pulley 4, lower pulley 5 and guide pulley 51 are all fixed facing in the direction of the retaining wall W. A protective material 8 such as a vinyl sheet or a resin partition plate is provided between both flanges of the upper support pile 1a. The protective material 8 is provided from the intermediate connecting plate 1c at the lower end of the upper support pile 1a along the length of the upper support pile 1a to the ground surface. This prevents the filling material 3 before solidification from entering the space in the upper support pile 1a where the lower pulley 4 is provided when the support pile 1 is erected.

[0015] (3) Tensile material The tendon 2 is made of PC steel wire and has been conventionally used as an anchor tendon. The tension member 2 penetrates the protective material 8 while engaged with the lower pulley 5, and both ends are fixed to a base 6 provided on the upper front surface of the retaining wall W. Tension is applied to the tendons 2, and the support pile 1 is fixed deep underground by the lower support pile 1b and the surrounding filler material 3, and is engaged with the lower pulley 5 in the ground, so even if the support pile 1 is close to the retaining wall W, it can support the wall from the rear without being affected by the deformation of the wall W. Support from the rear eliminates the need for struts, resulting in a short construction period and low cost. In addition, since the direction of the strong axis of the lower retaining pile 1b is the direction of the retaining wall W, the tensioning force of the tendon 2 can be increased.

[0016] (4) Construction method of earth retaining structure Next, a method for constructing the above-mentioned retaining structure will be described.

[0017] (4.1) Wire Engagement Process A wire 7 made of PC steel wire is placed parallel to the front surface of the web of the upper backpile 1a from the upper pulley 4 of the backpile 1 to the guide pulley 51. The wire 7 is then guided from the guide pulley 51 to the back surface side of the lower pulley 5 fixed to the web of the backpile 1, and engages with the lower pulley 5 from the back surface side. The wire 7 engaged with the lower pulley 5 is folded back towards the upper pulley 4 side.

[0018] (4.2) Pile installation process The shoring pile 1 is erected into the drilled hole filled with the filling material 3, with the lower shoring pile 1b facing downward (FIG. 4). At this time, both ends of the wire 7 are exposed to the ground surface. In addition, the space defined by the protective material 8 of the upper support pile 1a is filled with water. This prevents the space from being crushed by the pressure of the filling material 3, and also reduces the buoyancy acting on the support pile 1. If the protective material 8 is strong enough not to be deformed by the pressure of the filling material 3, and the weight of the support pile 1 is greater than the buoyancy acting on it, the space defined by the protective material 8 can be left hollow when erected. Then, after erecting the upper pulley 4 of the upper supporting pile 1a to a position where it protrudes above ground and is exposed above the ground surface, the filling material 3 is left to harden initially.

[0019] (4.3) Wire connection process Both ends of the wire 7 extended to the ground surface are connected in an engaged state to a wire rotating device 9 arranged on a rail 10 fixed to the ground surface in front of the position where the retaining wall W is to be constructed. The wire rotating device 9 is a device that can rotate the wire 7 by feeding it forward in the length direction. The wire rotating device 9 also has a function of adjusting the length of the wire 7 exposed from the wire rotating device 9. The rail 10 is installed in the direction from the retaining pile 1 to the retaining wall W, and the wire rotating device 9 is configured to be movable on the rail 10.

[0020] (4.4) Cutting process The wire 7 along the upper support pile 1a, the lower pulley 5, and the guide pulley 51 are located within the space defined by the protective material 8. Then, the wire 7 is rotated in the longitudinal direction by the wire rotating device 9 while being engaged with the upper pulley 4, the lower pulley 5, and the guide pulley 51. Since the wire 7, the upper pulley 4, the lower pulley 5, and the guide pulley 51 are not inside the filling material 3, the wire 7 can easily rotate in the longitudinal direction. Next, while the wire 7 is engaged with the upper pulley 4, the lower pulley 5, and the guide pulley 51, it is rotated in the longitudinal direction by the wire rotating device 9, and the wire rotating device 9 is moved in the direction of the retaining wall W. By moving the wire rotation device 9, the wire 7 between the lower pulley 5 and the wire rotation device 9 is pulled from the backing pile 1 side toward the retaining wall W, cutting into the ground (Figure 5). The protective material 8 is a vinyl sheet, a plastic partition plate, etc., so it can be cut into the ground in the same way. Since the wire 7 is engaged with the upper pulley 4, the wire 7 between the lower pulley 5 and the wire rotation device 9 rotates in the length direction and cuts into the ground. The rotation direction of the wire 7 may be in either direction or reciprocating motion, but if the part cutting into the ground is in the direction from the wire rotation device 9 toward the backing pile 1, soil adhering to the wire 7 when cutting into the ground may get into the lower pulley 5 side and impede the rotation, so it is preferable that the part cutting into the ground is in the direction from the backing pile 1 side toward the wire rotation device 9.

[0021] (4.5) Wire tensioning process The cut wire 7 cuts into the ground to a specified position, and the wire 7 is stretched in an approximately triangular shape with the upper pulley 4, lower pulley 5, and wire rotation device 9 as vertices, as shown in Figure 6.The upper pulley 4 is then removed, for example, to release the engagement between the upper pulley 4 and the wire 7, and the wire rotation device 9 is used to rotate the connected wire 7 and reduce its exposed length, allowing the disengaged wire 7 to cut into the ground and stretch the wire 7 between the lower pulley 5 and the wire rotation device 9 (Figure 7).

[0022] (4.6) Tensor connection process At the ground surface, the wire 7 is released and the end of the wire 7 is connected to the tendon 2 (Figure 8).

[0023] (4.7) Connection Tendon Retraction Process By operating the wire rotation device 9 and pulling in the wire 7 on the side opposite to the side to which the tension member 2 is connected to the wire rotation device 9, the tension member 2 is pulled into the ground between the lower pulley 5 and the wire rotation device 9 (Figure 9). Since the path for pulling in the tendon 2 is cut in advance by the wire 7, the tendon 2 can be easily pulled in and there is no need to drill holes to place the tendon 2. Once the tensioning of the tension member 2 has been completed, the wire rotation device 9 and rail 10 are removed and the front of the retaining wall W is excavated.

[0024] (4.8) Tensile tensioning process The tendon 2 is fixed under tension to a base 6 installed on a retaining wall W whose front side has been excavated, thereby constructing the retaining structure (Figure 1). In addition, the wire 7 that has cut into the ground can also be used as the tendon 2 as it is. In this case, the tendon connecting step and the connected tendon retracting step described above are unnecessary.

[0025] [Example 2] (1) Fixing the wire rotation device In the above-mentioned Example 1, the ground was cut with the wire 7 while the wire rotating device 9 was moving on the rails 10, but the above-mentioned wire connecting step (Fig. 10) and cutting step (Figs. 11 and 12) can be performed with the wire rotating device 9 fixed in advance to the ground surface on the opposite side of the back pile 1 from the position where the retaining wall W will be constructed. In the cutting step, the wire 7 is tensioned and cut into the ground by rotating the connected wire 7 and shortening its exposed length using the wire rotating device 9.

[0026] [Example 3] (1) Two-stage tendon structure In the above-mentioned Examples 1 and 2, the tendons 2 are in one row, but when the tendons 2 are in two rows, two lower pulleys 5 are attached in parallel (FIG. 13). The guide pulleys 51 and upper pulleys 4 are also in two rows. In the first stage, with two wires 7 engaged with two rows of upper pulleys 4, lower pulleys 5, and guide pulleys 51, construction is carried out with one wire as in the above-mentioned embodiments 1 and 2, and then the wire rotation device 9 is moved and construction is carried out with the other wire. At this time, a part of the site may be excavated and the wire rotation device 9 may be moved downward (Fig. 14).

[0027] [Example 4] (1) A structure using only an upper pulley and a lower pulley In the above-mentioned Examples 1 to 3, the upper pulley 4 is provided on the front surface of the support pile 1, but in this example, the web of the upper support pile 1a is notched and the rotation shaft of the upper pulley 4 is fixed between the notched webs, similar to the lower pulley 5 (Figs. 15 and 16). Also, the guide pulley 51 is not necessary. The abutment pile 1 has the same configuration as that of the first embodiment except for the upper pulley 4 and the guide pulley 51 (FIG. 17). One end of the tension member 2 is fixed to the back of the web at the upper part of the support pile 1 to form the fixed part 21, and extends downward along the upper support pile 1a and engages with the lower pulley 5, then penetrates the protective material 8 and has the other end fixed to a base 6 provided on the upper front part of the retaining wall W.

[0028] (2) Construction method of earth retaining structure Next, the method for constructing this retaining structure will be explained.

[0029] (2.1) Wire Engagement Process A wire 7 made of PC steel wire is placed parallel to the upper support pile 1a, spanning the upper pulley 4 and the lower pulley 5 of the support pile 1 (FIG. 16). The wire 7 engaged with the lower pulley 5 is folded back towards the upper pulley 4 side.

[0030] (2.2) Pile installation process The shoring pile 1 is erected into the drilled hole filled with the filling material 3, with the lower shoring pile 1b facing downward (FIG. 18). At this time, both ends of the wire 7 are exposed to the ground surface. As in the first embodiment, the space defined by the protective material 8 of the upper support pile 1a is filled with water. Then, after erecting the upper pulley 4 of the upper supporting pile 1a to a position where it protrudes above ground and is exposed above the ground surface, the filling material 3 is left to harden initially.

[0031] (2.3) Wire connection process Both ends of the wire 7 extended to the ground surface are connected in an engaged state to a wire rotating device 9 arranged on a rail 10 fixed to the ground surface in front of the position where the retaining wall W is to be constructed.

[0032] (2.4) Cutting process The wire 7 and lower pulley 5 along the upper brace 1a are positioned within a space defined by the protective material 8. The wire 7 is rotated in the longitudinal direction by a wire rotation device 9 while engaged with the upper pulley 4 and lower pulley 5. Since the wire 7, upper pulley 4, and lower pulley 5 are not within the filling material 3, the wire 7 can easily rotate in the longitudinal direction. Next, while the wire 7 is engaged with the upper pulley 4, the lower pulley 5, and the guide pulley 51, it is rotated in the longitudinal direction by the wire rotating device 9, and the wire rotating device 9 is moved in the direction of the retaining wall W. By moving the wire rotation device 9, the wire 7 between the lower pulley 5 and the wire rotation device 9 cuts into the ground (Figure 19).

[0033] (2.5) Wire installation process By moving the wire rotation device 9, the wire 7 cuts into the ground, allowing the wire 7 to be stretched in an approximately triangular shape with the upper pulley 4, lower pulley 5, and wire rotation device 9 as vertices (Figure 20).

[0034] (2.6) Tensile connection process At the ground surface, the wire 7 is disconnected and the tendon 2 is connected to the end of the wire 7 closer to the upper pulley 4 (Figure 21).

[0035] (2.7) Connection tendon retraction process By operating the wire rotating device 9 and pulling in the wire 7 on the side opposite to the side to which the tension member 2 is connected to the wire rotating device 9, the tension member 2 is pulled into the ground in an approximately triangular shape from the upper pulley 4 through the lower pulley 5 to the ground surface on the wire rotating device 9 side (Figure 22). Since the path for pulling in the tendon 2 is cut in advance by the wire 7, the tendon 2 can be easily pulled in and there is no need to drill holes to place the tendon 2. Once the tension of the tendon 2 has been completed, the wire rotation device 9 and the rail 10 are removed.

[0036] (2.8) Tensile tensioning process One end of the tendon 2 on the side of the upper pulley 4 is fixed to the upper back pile 1a to form a fixed part 31 (FIG. 22). Then, with tension applied to the tendon 2, the other end is fixed to a base 6 provided on a retaining wall W whose front side has been excavated, thereby completing the retaining structure (Figure 15). In addition, the wire 7 that has cut into the ground can also be used as the tendon 2 as it is. In this case, the tendon connecting step and the connected tendon retracting step described above are unnecessary. [Explanation of symbols]

[0037] 1 Support pile, 1a Upper support pile, 1b Lower support pile, 1c Intermediate connecting plate 2 tendons, 21 fixed parts 3 Filling material 4 Upper Pulley 5 Lower pulley, 51 Guide pulley 6 Pedestal 7 Wire 8. Protective Materials 9 Wire Rotation Device 10 Rail

Claims

1. A retaining wall that provides an excavation space in front, A retaining pile provided on the rear surface of the retaining wall; A tension member connecting the earth retaining wall and the supporting pile, The support pile has a lower pulley provided on the front side in the ground, The tension member is engaged with the lower pulley and both ends are fixed to a base provided on the front surface of the retaining wall, The support pile is configured by connecting an upper support pile and a lower support pile made of H-shaped steel via an intermediate connecting plate, The lower support pile is arranged so that the weak axis is substantially perpendicular to the retaining wall, The upper support pile is arranged so that its strong axis is substantially perpendicular to the retaining wall, The lower pulley is fixed near the lower end of the upper support pile. Mountain retaining structure.

2. A retaining wall that provides an excavation space in front, A retaining pile provided on the rear surface of the retaining wall; A tension member connecting the earth retaining wall and the supporting pile, The support pile has a lower pulley provided on the front side in the ground, The tension member has one end fixed to a fixing portion provided on the upper part of the support pile, extends downward from the fixing portion along the support pile, engages with the lower pulley, and has the other end fixed to a base provided on the front surface of the retaining wall, The support pile is configured by connecting an upper support pile and a lower support pile made of H-shaped steel via an intermediate connecting plate, The lower support pile is arranged so that the weak axis is substantially perpendicular to the retaining wall, The upper support pile is arranged so that its strong axis is substantially perpendicular to the retaining wall, The lower pulley is fixed near the lower end of the upper support pile. Mountain retaining structure.

3. In the retaining structure according to claim 1 or 2, Two lower pulleys are provided in parallel, The two tendons are engaged with either of the two lower pulleys and fixed to either of two pedestals provided at different heights on the front surface of the retaining wall, Mountain retaining structure.

4. a wire engagement process for providing a wire that is arranged parallel to the support pile between the lower pulley and the upper pulley and engages with the lower pulley and the upper pulley, the wire being disposed on the support pile having a lower pulley provided midway in the length direction and an upper pulley provided near one end thereof and facing in the same direction as the lower pulley; A step of erecting the pile into a drilled hole filled with a filler, with the other end of the pile facing downward and both ends of the wire exposed to the ground surface, and with the lower pulley and the upper pulley facing in the direction of constructing the retaining wall; a wire connecting step of connecting both ends of the wire in an engaged state to a wire rotating device disposed on the ground surface; a cutting process in which the wire is rotated in a longitudinal direction while being engaged with the upper pulley and the lower pulley by the wire rotating device, and the wire is used to cut into the ground from the support pile toward the retaining wall; a wire tensioning process in which a wire is tensioned in a substantially triangular shape with the upper pulley, the lower pulley, and the wire rotating device as vertices, and then the upper pulley and the wire are disengaged from each other, and an exposed length of the wire is shortened by the wire rotating device, thereby tensioning the wire between the lower pulley and the wire rotating device; A tensioning step of releasing the connection of the wire, using the wire as a tensioning material, and tensioning the tensioning material to fix it to a base provided on the retaining wall. How to construct an earth retaining structure.

5. The method for constructing an earth retaining structure according to claim 4, The tensioning step includes: a tendon connecting step of disconnecting the wire and connecting a new tendon to the end of the wire; A connected tendon drawing process in which the tendon connected to the wire is drawn into the ground between the lower pulley and the wire rotating device by the wire rotating device; a connecting tendon tensioning step of tensioning the tendon and fixing it to a base provided on the retaining wall.

6. a wire engagement process for providing a wire that is arranged parallel to the support pile between the lower pulley and the upper pulley and engages with the lower pulley and the upper pulley, the wire being disposed on the support pile having a lower pulley provided midway in the length direction and an upper pulley provided near one end thereof and facing in the same direction as the lower pulley; A step of erecting the pile into a drilled hole filled with a filler, with the other end of the pile facing downward and both ends of the wire exposed to the ground surface, and with the lower pulley and the upper pulley facing in the direction of constructing the retaining wall; a wire connecting step of connecting both ends of the wire in an engaged state to a wire rotating device disposed on the ground surface; a cutting process in which the wire is rotated in a longitudinal direction while being engaged with the upper pulley and the lower pulley by the wire rotating device, and the wire is used to cut into the ground from the support pile toward the retaining wall; a wire tensioning step of tensioning a wire in a substantially triangular shape with the upper pulley, the lower pulley, and the wire rotating device as vertices; a tensioning step of releasing the connection of the wire, using the wire as a tensioning member, fixing one end of the wire to a fixing part provided on the upper part of the supporting pile, and tensioning the tensioning member to fix the other end of the wire to a base provided on the retaining wall. How to construct an earth retaining structure.

7. The method for constructing an earth retaining structure according to claim 6, The tensioning step includes: a tendon connecting step of disconnecting the wire and connecting a new tendon to the end of the wire; A connected tendon drawing process in which the tendon connected to the wire is drawn into the ground between the lower pulley and the wire rotating device by the wire rotating device; a connected tendon tensioning step of fixing one end of the tendon to a fixing portion provided on the retaining pile, tensioning the tendon and fixing the other end to a base provided on the retaining wall.

8. The method for constructing an earth retaining structure according to any one of claims 4 to 7, The wire rotating device is movable on a rail installed on the ground surface between the support pile and the retaining wall. Characterized in that How to construct an earth retaining structure.

9. The method for constructing an earth retaining structure according to any one of claims 4 to 7, The wire rotating device is fixed to the ground surface on the opposite side of the supporting pile with respect to a position where the retaining wall is to be constructed. How to construct an earth retaining structure.

10. The method for constructing an earth retaining structure according to any one of claims 4 to 9, Two upper pulleys and two lower pulleys are provided in parallel, and in the wire engaging step, the two wires are engaged with either the upper pulley or the lower pulley, respectively; In the step of erecting the supporting piles, the supporting piles are erected with both ends of the two wires exposed to the ground surface, The wire connecting step, the cutting step, the wire tensioning step, and the tensioning step are performed by using one of the wires; The wire connecting step, the cutting step, the wire tensioning step, and the tensioning step are performed by the other wire. How to construct an earth retaining structure.

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