Connection method between stay pile and tendon, and earth retention structure

Abstract

To provide a connection method between a stay pile and a tendon supporting an earth retention wall from a rear face even when a sufficient area at the rear face of the earth retention wall allowing ground anchors to be installed is not secured.SOLUTION: A connection method between a stay pile and a tendon, the stay pile being provided at a rear face of an earth retention wall having an excavation space at a front face, and the tendon connecting the earth retention wall and the stay pile, comprises steps of: boring a pile hole; installing the stay pile in the pile hole; solidifying the pile hole by filling it with pile hole solidification material; boring an anchor hole from an earth retention wall side toward the stay pile; inserting the tendon into the anchor hole; filling the anchor hole with anchor solidification material for solidification; and connecting the stay pile and the tendon through the pile hole solidification material and the anchor hole solidification material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for connecting a retaining pile and a tendon in an earth retaining wall, and to an earth retaining structure. [Background technology]

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

[0003] The following two methods are particularly well known as construction methods for supporting retaining walls without using struts. (1) Tieback anchor method Patent Document 1 describes a tieback anchor construction method in which a retaining wall, the front of which is excavated, is supported by supporting piles installed on the rear side and tension members installed near the ground surface, as shown in Figure 13. (2) Ground anchor method Patent Document 2 describes a ground anchor construction method in which support is provided by ground anchors installed diagonally downward from the earth retaining wall, as shown in FIG. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-162266 [Patent Document 2] Japanese 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 near the ground surface, so in order for the support piles to function effectively, they must be located outside the main sliding line that extends upward from the bottom of the excavation. For this reason, the distance L between the retaining wall and the retaining piles must be at least as large as the distance from the wale to the bottom of the excavation, and there must be sufficient room behind the retaining wall to install the retaining piles.

[0006] In the ground anchor method, the ground anchor is fixed by the frictional resistance between the anchor and the ground, so the anchor needs to be installed in the anchor layer where the frictional resistance is high, and there needs to be sufficient space on the rear side of the retaining wall to allow the ground anchor to be installed. However, these construction methods are often difficult to implement, especially in urban areas, where there is limited space available.

[0007] In addition, methods for increasing tensile strength with a short anchorage length include the radish anchor method, which uses a rotor to enlarge the drilled hole and increase the adhesion area, but this method is only applicable to relatively soft ground that can be enlarged with a rotor.

[0008] An object of the present invention is to provide a method for connecting a retaining pile and a tendon that supports an earth retaining wall from the rear, even when there is not enough land on the rear surface of the wall to allow for the installation of ground anchors. [Means for solving the problem]

[0009] The present invention, made to achieve the above-mentioned object, is a method of connecting a retaining pile to a tensioning member, which connects a retaining pile installed on the rear surface of a retaining wall that has an excavation space in front of it, and a tensioning member that connects the retaining wall and the retaining pile, and is characterized by the steps of drilling a pile hole, erecting the retaining pile into the pile hole, filling the pile hole with pile hole solidification material and solidifying it, drilling an anchor hole from the retaining wall side towards the retaining pile, inserting the tensioning member with a load-bearing body at its tip into the anchor hole, filling the anchor hole with anchor hole solidification material and solidifying it, and connecting the retaining pile to the tensioning member via the pile hole solidification material and the anchor hole solidification material. The anchor hole has a spiral groove along the length of the outer wall surface of the part of the pile hole where the pile hole solidification material has solidified, and the spiral groove may be formed by a grooving step in which a grooving bit having one grooving tip protruding from its side is inserted into the anchor hole, and the grooving bit is rotated and advanced at the part of the pile hole where the pile hole solidification material has solidified to form a spiral groove on the outer wall surface of the anchor hole, and a pulling out step in which the grooving bit is pulled out straight without rotating. The support piles consist of lower support piles and upper support piles arranged at a predetermined interval above and below, and an intermediate section consisting of side plates that secure both sides of the lower support piles and the upper support piles, and the anchor holes may be drilled from the retaining wall side toward the intermediate section of the support piles. The intermediate portion may include a welded wire mesh secured to an inner surface of the side plate. The intermediate portion may have equally spaced grooves on the inner surface of the side plate that are parallel to a direction perpendicular to the axial direction of the tendon in a side view. The retaining pile is a site-constructed pile consisting of concrete and a reinforcing bar cage, the reinforcing bar cage has a reinforcing bar opening at the front position where the tension member passes, the anchor hole is drilled from the retaining wall side toward the reinforcing bar opening, and the pile hole solidification material filled in the pile hole may be the concrete. An inner reinforcing bar cage may be arranged within the reinforcing bar cage in accordance with the direction of the tendons, and the load-bearing body and the tendons may be arranged in the inner reinforcing bar cage.

[0010] The present invention also provides a method for connecting a retaining pile to a tensioning member, which connects a retaining pile installed on the rear surface of a retaining wall that has an excavation space in front of it, and a tensioning member that connects the retaining wall to the retaining pile, and is characterized by drilling a pile hole, erecting the retaining pile into the pile hole, drilling an anchor hole from the retaining wall side toward the retaining pile, inserting the tensioning member into the anchor hole, and filling the pile hole with a pile hole solidification material and solidifying it, thereby connecting the retaining pile and the tensioning member via the pile hole solidification material, and filling the anchor hole with the anchor hole solidification material and solidifying it.

[0011] The earth retaining structure of the present invention comprises an earth retaining wall that provides an excavation space at the front, a support pile provided at the rear surface of the earth retaining wall, and a tension member that connects the earth retaining wall and the support pile, and is characterized in that the support pile and the tension member are connected by any of the above-mentioned methods for connecting a support pile and a tension member of the present invention. [Effects of the Invention]

[0012] The present invention can achieve at least one of the following effects by solving the above-mentioned problems. (1) The tendons are connected deep within the retaining piles, so they can be supported from the rear without being affected by deformation of the retaining wall. (2) Because the retaining wall is supported from the rear, struts are not required, resulting in a short construction period and low cost. (3) By creating a spiral groove on the wall of the anchor hole in the area where the pile hole solidification material of the backing pile has solidified, it is possible to achieve high adhesion strength even with a short anchorage length. (4) By placing a welded wire mesh or the like near the tendon, the force is transmitted to the entire support pile through the welded wire mesh and the rebar cage, suppressing cone-shaped failure. (5) The support piles and tension members can be connected by filling the anchor holes with anchor hole solidification material, eliminating the need for excavation behind the retaining wall or connecting the support piles and tension members underground. [Brief explanation of the drawings]

[0013] [Figure 1] An explanatory diagram of an earth retaining structure to which the method for connecting abutment piles and tendons of the present invention is applied. [Figure 2] Perspective view of the support pile [Figure 3] An exploded perspective view of the lower support pile, upper support pile, and middle section [Figure 4] Illustrative diagram of the connection between the support pile and the tendon [Figure 5] Diagram of how to connect the support pile and tendon (1) [Figure 6] Diagram of how to connect the support pile and tendon (2) [Figure 7] Diagram of how to connect the support pile and tendon (3) [Figure 8] Perspective view of a groove bit [Figure 9] Anchor hole diagram [Figure 10] Diagram of how to connect the support pile and tendon (4) [Figure 11] A perspective view of a support pile according to Example 2 [Figure 12] An explanatory diagram (1) of a retaining structure applying the connecting method of the support pile and the tendon according to Example 3 [Figure 13] A perspective view of a support pile according to Example 3 [Figure 14] An explanatory diagram (2) of a retaining structure applying the connecting method of the support pile and the tendon according to the third embodiment [Figure 15] Diagram of conventional earth retaining construction method (1) [Figure 16] Diagram of conventional earth retaining construction method (2) DETAILED DESCRIPTION OF THE INVENTION

[0014] The method for connecting the retaining piles and tendons of the present invention will be described in detail below with reference to the drawings. In this description, expressions relating to directions such as front-to-back and up-to-down are defined based on the earth retaining wall W and the retaining pile 1, with the front meaning the direction from the retaining pile 1 toward the earth retaining wall W, the up-to-down direction meaning the height direction of the earth retaining wall W and the retaining pile 1, and the lateral direction meaning the direction perpendicular to the front and up-to-down directions.

[0015] [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, with tendons 2 connected to supporting piles 1 provided on the rear side (Fig. 1). The retaining wall W can be any of the conventional retaining walls known in the art, 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 steel sheet piles into the ground, or a soil cement wall made by creating a continuous wall made of soil cement underground. Anchor holes 3 are formed from the retaining wall W to the support piles 1, and the tendons 2 are placed inside the anchor holes 3. The anchor holes 3 are filled with an anchor hole hardening material 4 such as cement milk. The connecting position of the support pile 1 and the tendon 2 is deeper than the main sliding line. Anchor holes 3 are formed diagonally downward from the support pile 1 side and the tendon 2 is placed in them, so the connection can be made deeper than the main sliding line, and the support pile 1 and the tendon 2 can stably support the retaining wall W.

[0016] (2) Support piles The support pile 1 is composed of a lower support pile 1a and an upper support pile 1b, which are spaced apart vertically and vertically, connected via a middle part 1c, and is erected in a pile hole 11 (Figs. 2 and 3). The inside of the pile hole 11 is filled with a pile hole solidification material 19 such as cement milk and hardened. Both the lower support pile 1a and the upper support pile 1b are H-shaped steel beams, and both have flanges at the front and back, with the direction of the retaining wall W as the weak axis.

[0017] (2.1) Middle section The middle section 1c connecting the lower support pile 1a and the upper support pile 1b is made up of side plates 12 that are fixed between the lower support pile 1a and the upper support pile 1b, spanning between the front and rear flanges on both sides. Since there is a gap between the lower support pile 1a and the upper support pile 1b in the vertical direction, the space between the side plates 12 on both sides is hollow, and the tendons 2 are placed inside the hollow. Reinforcing ribs 13 may be provided on the sides of the side plates 12 in the vertical direction. A welded wire mesh 14 is provided on the inner surface of the side plate 12. The welded wire mesh 14 is arranged near the tendon 2, so when a force acts on the tendon 2 in the pull-out direction, it prevents the pile hole solidification material 19 from breaking into a cone shape at the side plate 12, and increases the adhesive strength between the side plate 12 and the pile hole solidification material 19 so that the force can be received by the side plate 12. Reinforcement plates 15 are provided at the upper rear side and lower front side between both side plates 12.

[0018] (3) Tensile material The tendon 2 is a type of PC steel wire or PC steel rod that has been conventionally used as an anchor tendon. The tendon 2 has a load-bearing body 21 fixed to one end, is inserted into the anchor hole 3 and passes through the middle part 1c of the retaining pile 1, and is joined to the retaining pile 1 by the pile hole solidification material 19 in the retaining pile 1 and the anchor hole solidification material 4 in the anchor hole 3 to form a single unit.Then, the other end is fixed through the anchor hole 3 to a base 5 provided on the upper front surface of the retaining wall W, connecting the retaining pile 1 and the retaining wall W. Tension is applied to the tendon 2, and it is connected to the backing pile 1 at a deep position, so even if the backing pile 1 is located close to the earth retaining wall W, it can support the pile from the rear without being significantly affected by the deformation of the wall W. Because it is supported from the rear, no struts are required, resulting in a short construction period and low cost.

[0019] (4) Anchor holes The anchor hole 3 has the tendon 2 inserted therein and is filled with anchor hole hardening material 4, which is then hardened. In this embodiment, the retaining wall W is formed at a 45-degree downward angle from the retaining wall to the retaining pile 1, but this is not limited to this and the retaining wall W may be formed at a predetermined angle from the retaining wall to the retaining pile 1, or may be formed horizontally.

[0020] (4.1) Spiral groove The anchor hole 3 is formed by penetrating the pile hole 11, and has a spiral groove 31 along the length of the outer wall surface at the location where the pile hole solidification material 19 has solidified within the pile hole 11. The spiral groove 31 is perpendicular to the force application direction (the direction in which the tension member 2 is pulled out). When a pull-out force acts on the tension member 2, if the anchor hole 3 inside the pile hole 11 is smooth, the pile hole solidification material 19 that has solidified inside the pile hole 11 and the anchor hole solidification material 4 that is filled in and solidified after the anchor hole 3 is drilled will have an adhesive force that corresponds to the contact area, but by providing a spiral groove 31 in the anchor hole 3, the contact surface between the pile hole solidification material 19 and the anchor hole solidification material 4 will have unevenness, and the peaks of both the pile hole solidification material 19 and the anchor hole solidification material 4 will provide shear resistance, so that even with a short anchorage length like the pile hole 11 portion, great adhesive strength will be exhibited.

[0021] Thus, by providing the spiral groove 31 in the anchor hole 3, when a pull-out force acts on the tendon 2, it tends to cause cone-shaped failure rather than bond failure. The cone-shaped failure spreads from the base of the load-bearing body 21 attached to one end of the tendon 2 so as to spread out at an angle of 45 degrees to the axis of the pull-out force. The load-bearing body 21 is placed passing through the middle part 1c of the backing pile 1, and since a welded wire mesh 14 is attached to the side plate 12 of the middle part 1c near the tendon 2 to increase the adhesion force with the pile-hole solidification material 19, the pull-out force is transmitted from the pile-hole solidification material 19 to the side plate 12 and the inner surface of the flanges of the lower backing pile 1a and upper backing pile 1b, and the entire load is transmitted from the tendon 2 to the backing pile 1, suppressing the cone-shaped failure.

[0022] (5) Method of connecting the support piles and tendons and method of constructing the earth retaining structure Next, a method for connecting the support piles 1 and the tendons 2 and a method for constructing an earth retaining structure will be described.

[0023] (5.1) Insertion of the backing piles (Figure 5) Pile holes 11 for the support piles 1 are drilled on the back surface of the retaining wall W, and the support piles 1 are inserted and erected. The pile holes 11 are filled with a pile hole solidification material 19, which is then solidified to fix the support piles 1 in place.

[0024] (5.2) Drilling anchor holes The anchor hole 3 of the present invention has a spiral groove 31 on the outer peripheral surface inside the pile hole 11, and is therefore drilled in the following steps.

[0025] (5.2.1) Drilling process (Fig. 6) A ground anchor drilling machine is used to drill anchor holes 3 by drilling downward at an angle of 45 degrees from the side of the retaining wall W. A normally used drill bit and drill casing (not shown) are used for drilling. The anchor hole 3 is drilled from the front of the pile hole 11 through the side plates 12 of the middle part 1c and from the rear of the pile hole 11 backward by a predetermined length.

[0026] (5.2.2) Grooving process (Fig. 7) After the drill bit and drill casing are removed from the anchor hole 3, the drill bit is replaced with a groove bit 6 and the hole is drilled again. The grooved bit 6 is a conventional drill bit with a single protruding grooved tip 61 made of hard steel with a sharpened tip attached to the side (Figure 8), and can be easily made from a conventional drill bit. To re-drill the hole, the groove bit 6 is attached to the tip of the drilling casing 62 and inserted into the anchor hole 3. After reaching the pile hole 11, the groove bit 6 is rotated and advanced through the anchor hole 3 formed in the pile hole solidification material 19, forming a single spiral groove 31 along the length of the wall of the anchor hole 3. When multiple groove bits 61 are used, fluctuations in the rotation speed or drilling speed of the groove bit 6 can cause subsequent groove bits 61 to disrupt the spiral groove 31 formed by the preceding groove tip 61. However, the present invention uses only one groove tip 61, so there is no risk of disrupting the spiral groove 31. However, even when multiple groove tips 61 are used, by controlling the rotation speed and drilling speed of the groove bit 6, subsequent groove tip 61 can form a new spiral groove 31 without disrupting the spiral groove 31 formed by the preceding groove tip 61.

[0027] (5.2.3) Drawing process After grooves are formed along the entire length of the anchor hole 3 in the pile hole solidification material 19, the rotation of the groove bit 6 is stopped and the groove bit 6 is pulled out straight. By stopping the rotation and pulling out straight, the spiral groove 31 is not damaged by the rotation of the groove bit 6. However, when the groove bit 6 is pulled out, the groove tip 61 forms a linear pulling groove 32 in the length direction of the anchor hole 3 in the pile hole solidification material 19 (Figure 9). However, the pulling groove 32 is small compared to the entire spiral groove 31, and does not impair the function of the spiral groove 31. Note that by controlling the pulling speed and rotation speed of the groove bit 6, the groove bit 6 can be pulled out while rotating without disturbing the spiral groove 31.

[0028] (5.3) Tendon insertion process (Fig. 10) The tension member 2 with the load-bearing body 21 fixed thereto is pushed into the drilling casing of the anchor hole 3, and the load-bearing body 21 is inserted until it passes through the middle part 1c of the back pile 1 and its tip reaches the tip of the anchor hole 3.

[0029] (5.4) Integration of tendons and shoring piles By injecting anchor hole solidification material 4 into the anchor hole 3 and solidifying it, the tendon 2 and the backing pile 1 are integrated in the pile hole 11 portion via the pile hole solidification material 19 and the anchor hole solidification material 4.

[0030] (5.5) Construction of earth retaining structures After the anchor hole solidification material 4 has solidified, tension is applied to the tendon 2 from the retaining wall W side and it is fixed to a base 5 provided on the retaining wall W, thereby constructing the retaining structure. In the present invention, the retaining pile 1 and the tension member 2 can be integrated by filling the pile hole 11 with a pile hole solidification material 19, and there is no need to excavate the back of the retaining wall W or to connect the retaining pile 1 and the tension member 2 at the connection point underground. By applying this invention, it is possible to construct an earth retaining structure even in cases where excavation behind the retaining wall W would affect the surrounding ground, or where excavating the ground down to the joint area to carry out joining work would be dangerous.

[0031] [Example 2] (1) Structure of the middle section In the above-mentioned Example 1, the welded wire mesh 14 is provided on the inner surface of the side plate 12 of the middle part 1c to increase the adhesive strength between the side plate 12 and the pile hole solidification material 19, but instead of the welded wire mesh 14, equally spaced grooves 121 may be provided on the inner surface of the side plate 12 in a direction perpendicular to the axial direction of the tendon 2 (the pull-out direction of the tendon 2) in side view (Fig. 11). The pile hole solidification material 19 enters into the grooves 121, thereby increasing the adhesive strength between the side plate 12 and the pile hole solidification material 19.

[0032] [Example 3] (1) Construction using on-site piles In the above-described first and second embodiments, the backing pile 1 is configured as an H-shaped steel pile, but the backing pile 1 may also be an on-site pile configured as a concrete 16 and a reinforcing bar cage 17 (FIG. 12). The reinforcing bar cage 17 is cylindrical and does not have reinforcing bars placed inside, so it is possible to drill the anchor holes 3. In addition, by providing a reinforcing bar opening 171 at the position in front of the reinforcing bar cage 17 where the tendon 2 passes, it becomes possible to drill the anchor holes 3 inside the backing pile 1. The spiral groove 31 in the anchor hole 3 encourages cone-shaped failure rather than bond failure when a pullout force acts on the tendon 2. The cone-shaped failure spreads from the base of the load-bearing body 21 attached to one end of the tendon 2 at a 45-degree angle relative to the axis of the pullout force. The load-bearing body 21 and tendon 2 are placed within the rebar cage 17, and when force is transmitted to the rebar cage 17, the entire load is transferred from the tendon 2 to the shoring pile 1, preventing cone-shaped failure. Compared to the H-shaped steel pile of Example 1, the shoring pile 1 of this example, which is an in-situ pile, has a larger diameter. Therefore, the load-bearing body 21 can transmit force to the inner rebar cage 18 even when inside the shoring pile 1, eliminating the need to drill the anchor hole 3 through the pile hole 11. In addition, the inner reinforcing bar cage 18 may be arranged within the reinforcing bar cage 7 in the direction of the tendon 2, and the load-bearing body 21 and the tendon 2 may be arranged within the inner reinforcing bar cage 18, thereby improving the integrity of the backing pile 1 and the concrete 16 (Figures 13 and 14). By transmitting the force to the inner reinforcing bar cage 18, the entire load is transmitted from the tendon 2 to the supporting pile 1, and the cone-shaped destruction is suppressed.

[0033] [Example 4] (1) Solidification of pile hole solidification material and anchor hole solidification material In the above-mentioned Examples 1 to 3, after the pile hole solidification material 19 was solidified, the anchor holes 3 were drilled, the spiral grooves 31 were formed, the tension members 2 were inserted, and the anchor hole solidification material 4 was injected and solidified. However, the pile hole solidification material 19 and the anchor hole solidification material 4 may also be injected and solidified after the anchor holes 3 are drilled and the tension members 2 are inserted. In this case, the backing pile 1 and the tendon 2 are covered with the pile hole solidification material 19 and become one, so there is no need for the spiral groove 31 to increase the anchoring strength of the pile hole solidification material 19 and the anchor hole solidification material 4. Then, due to the action of the welded wire mesh 14 and groove 121 on the inner surface of the side plate 12 located near the tendon 2, the reinforcing bar cage 17, and the inner reinforcing bar cage 18, the pulling force acting on the tendon 2 is transmitted from the tendon 2 to the backing pile 1, and cone-shaped failure is suppressed.

[0034] [Example 5] (1) Connection to something other than a support pile In the above-mentioned Examples 1 to 3, the retaining wall W is supported by connecting the tendons 2 to the support piles 1, but the retaining wall W may also be supported by forming anchor holes 3 and spiral grooves 31 in bedrock or boulders underground or in concrete structures remaining underground, inserting the tendons 2, and injecting and solidifying the anchor hole solidification material 4, and connecting them to the tendons 2. [Explanation of symbols]

[0035] 1 support pile, 1a lower support pile, 1b upper support pile, 1c middle part, 11 pile hole, 12 side plate, 121 groove, 13 reinforcing rib, 14 welded wire mesh, 15 reinforcing plate, 16 concrete, 17 reinforcing bar cage, 171 reinforcing bar opening, 18 inner reinforcing bar cage, 19 pile hole solidification material 2 Tendons, 21 Load-bearing bodies 3 anchor hole, 31 spiral groove, 32 pull-out groove 4 Anchor hole solidification material 5. Pedestal 6 Grooving bit, 61 Grooving tip, 62 Drilling casing

Claims

1. A method for connecting a retaining pile and a tendon, which connects a retaining pile installed on the rear surface of a retaining wall that provides an excavation space in front of the retaining wall and a tendon that connects the retaining wall and the retaining pile, Drilling a pile hole and erecting the supporting pile into the pile hole; Fill the pile hole with pile hole solidification material and solidify it. Drilling anchor holes from the retaining wall side toward the supporting piles, The tendon having a load-bearing body at its tip is inserted into the anchor hole, The anchor hole is filled with an anchor hole solidification material and solidified, and the pile and the tension member are connected via the pile hole solidification material and the anchor hole solidification material. A method for connecting the support piles and tendons.

2. The anchor hole has a spiral groove in the length direction on the outer wall surface of the part where the pile hole solidification material has solidified in the pile hole, The spiral groove is formed by inserting a groove bit having one groove tip protruding from a side surface into the anchor hole, and rotating and feeding the groove bit at a location where the pile hole solidification material has solidified in the pile hole, forming a spiral groove on the outer peripheral wall surface of the anchor hole; A drawing step in which the groove bit is pulled out straight without being rotated. The method for connecting a pier and a tendon according to claim 1.

3. The support piles are composed of lower support piles and upper support piles arranged at a predetermined interval above and below, and an intermediate portion consisting of side plates that fix both sides of the lower support piles and the upper support piles, The anchor hole is drilled from the retaining wall side toward the middle part of the support pile, The method for connecting a pier and a tendon according to claim 2.

4. The intermediate portion has a welded wire mesh fixed to the inner surface of the side plate. The method for connecting a pier and a tendon according to claim 3.

5. The intermediate portion is characterized in that the inner surface of the side plate has equally spaced grooves that are parallel to a direction perpendicular to the axial direction of the tendon in a side view. The method for connecting a pier and a tendon according to claim 3.

6. The shoring pile is a site-constructed pile made of concrete and a reinforcing bar cage, The reinforcing bar cage has a reinforcing bar opening at a position on the front surface through which the tendon passes, The anchor hole is drilled from the retaining wall side toward the reinforcing bar opening, The pile hole solidification material filled in the pile hole is the concrete, The method for connecting a pier and a tendon according to claim 2.

7. An inner reinforcing bar cage is arranged in the reinforcing bar cage in accordance with the direction of the tendon, and the load-bearing body and the tendon are arranged in the inner reinforcing bar cage. The method for connecting a pier and a tendon according to claim 6.

8. A method for connecting a retaining pile and a tendon, which connects a retaining pile installed on the rear surface of a retaining wall that provides an excavation space in front of the retaining wall and a tendon that connects the retaining wall and the retaining pile, Drilling a pile hole and erecting the supporting pile into the pile hole; Drilling an anchor hole from the retaining wall side toward the supporting pile, Inserting the tendon into the anchor hole; The pile hole is filled with a pile hole hardening material and hardened, thereby connecting the support pile and the tension member via the pile hole hardening material, and the anchor hole is filled with an anchor hole hardening material and hardened. A method for connecting the support piles and tendons.

9. A retaining wall that provides an excavation space in front, A retaining pile provided on the rear surface of the retaining wall; and a tension member connecting the earth retaining wall and the supporting pile, The pier and the tendon are connected by the method for connecting a pier and a tendon according to any one of claims 1 to 8. Mountain retaining structure.

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