Connection method between the support pile and the tendon

Abstract

To provide a method for connecting a retaining pile and a tendon, supporting a mountain retaining wall from a rear surface even when there is not enough site where a ground anchor can be installed on the rear surface of the mountain retaining wall.SOLUTION: In a method for connecting a retaining pile and a tendon, which connects a retaining pile provided on a rear surface of a retaining wall having an excavated space in front thereof, and a tendon connecting the retaining wall and the retaining pile, the retaining pile, an upper girder that can be lowered along the retaining pile, and a lower girder that is located below the upper girder and can be raised along the retaining pile are erected in the ground. An anchor hole is drilled diagonally downward from the retaining wall side toward the retaining pile. The tendon is inserted into the anchor hole together with an engagement jig fixed to a tip. As the upper girder lowers, the lower girder rises, and a girder material formed integrally with the upper girder and the lower girder of the girder material is arranged above and below the tendon fixed to the engagement jig. The tendon and the engagement jig are pulled back to engage the girder material and the retaining pile, thereby connecting the retaining pile and the tendon via the girder 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 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 18. (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. 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 to drive the retaining piles into the rear of the retaining wall.

[0006] In the ground anchor method, the ground anchor is fixed by frictional resistance between the anchor and the ground, so it is necessary to install an anchor of a certain length or more in the anchor layer where the frictional resistance is high, and there must be sufficient space on the rear side of the 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 a method for connecting a retaining pile and a tendon, which supports an earth retaining wall from the rear, even when there is not enough land on the rear surface of the earth retaining wall to install a ground anchor. [Means for solving the problem]

[0008] The method for connecting a retaining pile and a tension member of the present invention, which has been made to achieve the above-mentioned object, is a method for connecting a retaining pile provided on the rear surface of an earth retaining wall that provides an excavation space on the front surface thereof, and a tension member that connects the earth retaining wall and the retaining pile, The said support pile is composed of a lower support pile and an upper support pile arranged at a predetermined interval above and below, and an intermediate part consisting of a side plate that fixes both sides across the said lower support pile and the said upper support pile, and the said side plate of the said intermediate part of the said support pile has a sawtooth-shaped cut having an inclined side inclined with respect to the horizontal on the rear edge, The support pile and a support pile capable of descending along the support pile The structure includes an upper cross beam, an upper horizontal guide arranged horizontally, an upper girder lifting rope having one end fixed to the upper horizontal guide and the other end exposed to the ground surface while being arranged along the support pile, and an engagement portion that can be fitted into the notch. an upper girder and a lower part of the upper girder that is capable of ascending along the supporting piles; The lower cross beam, the lower horizontal guide arranged horizontally, and the lower girder lifting rope having one end fixed to the lower horizontal guide, arranged along the support pile, and the other end exposed to the ground surface. The lower beam and A guide rod that is inserted through the upper horizontal guide and the lower horizontal guide, is arranged vertically along the support pile, and has an upper end exposed to the ground surface; The pile is then erected in the ground, and the supporting pile is The intermediate portion An anchor hole is drilled in a diagonally downward direction toward the center of the tension rod, and the tension rod is inserted into the anchor hole together with an engagement jig having a tip fixed thereto. Loosen the upper girder lift rope at the ground surface. The upper girder Along the guide rod As it descends The lower girder lifting rope is wound up on the ground surface. The lower girder is raised along the guide rod, and the upper and lower tendons fixed to the engagement jig are BeforeA girder member formed integrally with the upper girder and the lower girder is placed, and the tension member and the engagement jig are pulled back to the girder member. The engagement portion and the aforementioned support pile The cut of Fitting and connecting the supporting pile and the tension member via the girder. 。 before The notch comprises a horizontal edge extending horizontally forward from the rear edge of the side panel, a vertical edge extending vertically downward from the end of the horizontal edge, and an inclined edge extending approximately parallel to the anchor hole from the lower end of the vertical edge to the rear edge of the side panel, and the engagement portion may have a triangular shape in cross section that abuts the horizontal edge and the vertical edge when engaged with the notch. In the process of inserting the engaging jig and the tension material into the anchor hole, the engaging jig is pushed into the anchor hole by a twist prevention tube provided behind the engaging jig, and at this time, the tension material may be inserted into a tension material insertion tube provided within the twist prevention tube. The intermediate portion may have a top plate at its upper end and a bottom plate at its lower end, the space between the top plate and the bottom plate being surrounded by a tubular protective tube, and the anchor holes may be provided through the protective tube. Effect of the Invention

[0009] The present invention provides at least one of the following effects by solving the above-mentioned problems. (1) Since the tension material is connected at a deep position in the retaining pile, it can support the pile from the rear without being affected by deformation of the retaining wall. (2) Since the retaining wall is supported from the rear, there is no need for struts, resulting in a short construction period and low cost. (3) The tendons and supporting piles can be easily connected by operating the upper girder lifting ropes, lower girder lifting ropes, bands, and engaging jigs from the ground. (4) By surrounding the middle section with the top plate, bottom plate, and protective pipe, it is possible to prevent the internal upper girder and other equipment from touching the hole wall and being damaged when the supporting pile is erected, and it is also possible to prevent the equipment from being buried in soil that has fallen off the hole wall after insertion. (5) The retaining piles and tension members can be connected by operating the tension members at the mouth of the anchor hole on the retaining wall side and by operating the upper girder lifting ropes, lower girder lifting ropes, and ties on the ground, eliminating the need for excavation behind the retaining wall or connection work at the connection points between the retaining piles and tension members underground. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram of a retaining structure to which the method for connecting the retaining piles and the tendons of the present invention is applied. [Diagram 2] Perspective view of the support pile [Diagram 3] An exploded perspective view of the lower support pile, upper support pile and middle part [Figure 4] A perspective view of the middle part covered with a protective tube [Diagram 5] Exploded perspective view of upper and lower girders [Figure 6] Illustration of the up and down movement of the upper and lower girders (1) [Figure 7] Illustration of the up and down movement of the upper and lower girders (2) [Figure 8] An explanatory diagram of an embodiment of the upper and lower girders [Figure 9] A perspective view of an engagement jig [Figure 10] Cross-sectional view of the engagement jig [Figure 11] Diagram of how to connect the support pile and the tendon (1) [Figure 12] Diagram of how to connect the support pile and the tendon (2) [Figure 13] Diagram of how to connect the support pile and the tendon (3) [Figure 14] Diagram of how to connect the support pile and the tendon (4) [Figure 15] Diagram of how to connect the support pile and the tendon (5) [Figure 16] Diagram of how to connect the support pile and the tendon (6) [Figure 17]FIG. 2 is an explanatory diagram of a retaining structure to which the connecting method of the bracing pile and the tendon of the present invention according to the second embodiment is applied. [Figure 18] Diagram of conventional earth retaining construction method (1) [Figure 19] Diagram of conventional earth retaining construction method (2) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The method for connecting the retaining piles and the tendons 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, and down-down 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.

[0012] [Example 1] (1) Structure of the earth retaining structure The earth retaining structure to which the present invention is applied has an earth retaining wall W, the front of which is excavated, supported by tendons 2 connected to bracing piles 1 provided on the rear side (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 steel sheet piles into the ground, or a soil cement wall made by continuously creating a wall made of soil cement in the ground. Anchor holes 3 are formed diagonally 45 degrees downward from the retaining wall W to the back pile 1, and the tendons 2 are placed inside the anchor holes 3. The anchor holes 3 are filled with a filler 4 such as cement milk. The connection position of the backing pile 1 and the tendon 2 is deeper than the main slip line. The tendon 2 is placed in an anchor hole 3 formed diagonally downward from the backing pile 1 side, so that the connection can be made deeper than the main slip line, and the backing pile 1 and the tendon 2 can stably support the retaining wall W.

[0013] (2) Support piles The support pile 1 is constructed by connecting a lower support pile 1a and an upper support pile 1b, which are spaced a predetermined distance apart above and below, via a middle portion 1c (FIGS. 2 and 3). Both the lower support pile 1a and the upper support pile 1b are H-shaped steel, and both have two flanges at the front and back, with the direction of the retaining wall W as the weak axis. The lower support pile 1a is fixed around its periphery with filling material 4.

[0014] (2.1) Middle section The middle section 1c connecting the lower support pile 1a and the upper support pile 1b is made of side plates 11 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 (Fig. 3). 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 11 on both sides is hollow. Reinforcing ribs 12 may be provided on the side surfaces of the side plates 11 in the vertical direction. The side plate 11 has a series of sawtooth cuts 111 on its rear edge. Each cut 111 consists of a horizontal side 111a extending horizontally forward from the rear edge of the side plate 11, a vertical side 111b extending vertically downward from the front end of the horizontal side 111a, and an inclined side 111c sloping downward from the bottom end of the vertical side 111b to the rear edge of the side plate 11. The inclined side 111c is at an angle of 45 degrees parallel to the anchor hole 3. A reinforcing plate 13 is provided between the side plates 11 on the upper rear side and the lower front side. A top plate 14 is provided at the upper end of the middle portion 1c, and a bottom plate 15 is provided at the lower end (FIG. 2). The top plate 14 is penetrated by an upper bail 1b, and the bottom plate 15 is penetrated by a lower bail 1a. The space between the top plate 14 and the bottom plate 15 is surrounded by a protective pipe 16 (Fig. 4). By making the protective pipe 16 out of paper, for example, it is possible to easily drill the anchor holes 3 by penetrating the protective pipe 16 from front to back. In this embodiment, the top plate 14 is fixed to the upper backing pile 1b, the bottom plate 15 is fixed to the lower backing pile 1a, and the protective pipe 16 is fixed to fasteners 14a, 15a provided on the lower backing pile 1a and the upper backing pile 1b. An upper girder 51 and a lower girder 52 that are movable up and down along the rear surface of the side plate 11 are housed inside the protective pipe 16 of the middle portion 1c. By surrounding the middle section 1c with the top plate 14, bottom plate 15, and protective pipe 16, it is possible to prevent the internal equipment such as the upper girder 51 and lower girder 52 from touching and being damaged by the hole wall when the backing pile 1 is erected, and it is also possible to prevent the equipment from being buried in soil lumps that fall off the hole wall after insertion, and to prevent the equipment from being buried in the filling material 4 when filling the area around the lower backing pile 1a. In addition, a bypass pipe 17 is provided which passes through the bottom plate 15, the inside of the protective pipe 16, and the top plate 14 to connect the lower support pile 1a side and the upper support pile 1b side. When inserting the backing pile 1, the inside of the drilled hole for the backing pile 1 is filled with bentonite liquid to prevent the hole wall from collapsing, and the bottom of the hole is filled with filler material 4 to fix the periphery of the lower backing pile 1a. The protective pipe 16 for the backing pile 1 is covered on the underside with a bottom plate 15, and when the backing pile 1 is inserted, resistance from the bentonite liquid and filler material is encountered, but by providing a bypass pipe 17, the bentonite liquid and filler material 4 on the lower backing pile 1a side passes through the bypass pipe 17 to the upper backing pile 1b side, reducing resistance and allowing the backing pile 1 to be inserted. In addition, from the top plate 14 upward, a rope protection tube 18 for protecting the upper girder lifting rope 515, the lower girder lifting rope 525, and the binding material 55, which will be described later, may be provided along the upper support pile 1a. The anchor holes 3 penetrate the protective pipe 16 from front to back, and the filler 4 is filled not only into the anchor holes 3 but also into the inside of the protective pipe 16 .

[0015] (3) Tensile material The tendon 2 is a type of steel that has conventionally been used as an anchor tendon, such as a PC steel wire or a PC steel bar. One end of the tendon 2 is fixed to the engagement jig 6, which is engaged with the girder 5 formed integrally of an upper girder 51 and a lower girder 52 within the intermediate portion 1c, and connected to the retaining pile 1. The other end is then fixed through the anchor hole 3 to the base 7 provided on the upper front surface of the retaining wall W, connecting the retaining pile 1 to the retaining wall W. Since tension is applied to the tendons 2 and they are connected to the deep position of the retaining pile 1, even if the retaining pile 1 is located close to the retaining wall W, it can support the pile from the rear without being significantly affected by the deformation of the retaining wall W. Since the tendons are supported from the rear, no struts are required, resulting in a short construction period and low cost.

[0016] (4) Beams (Fig. 5) The girder 5 is made up of an upper girder 51 and a lower girder 52 which are integral with each other. The upper beam 51 has an inclined, flat upper cross beam 511 and upper horizontal guides 512 arranged horizontally on both ends of the upper cross beam 511. The lower girder 52 is located below the upper girder 51, and similar to the upper girder 51, has an inclined, flat lower cross beam 521 and lower horizontal guides 522 arranged horizontally on both ends of the lower cross beam 521. The inclination angle of the upper cross beam 511 and the lower cross beam 521 is set to 45 degrees parallel to the anchor holes 3. The upper girder 51 and the lower girder 52 can each move up and down, and when the upper girder 51 is lowered and the lower girder 52 is raised, the upper horizontal guide 512 and the lower horizontal guide 522 come into contact, and the upper cross girder 511 and the lower cross girder 521 become integrated to form the girder material 5 with a predetermined gap between them that allows the tendon 2 to be sandwiched between them. The upper cross girder 511 and the lower cross girder 521 are provided with an upper spacer 513 and a lower spacer 523 to maintain this gap.

[0017] (4.1) Up-down movement of upper and lower girders (Figs. 5-7) The upper horizontal guide 512 and the lower horizontal guide 522 are provided with vertical guide rod insertion holes 512a, 522a that are the same in a plan view, and a guide rod 53 extending in the vertical direction is inserted through them. Two guide rods 53 are provided at a predetermined interval in the front-to-rear direction for each of the upper horizontal guide 512 and lower horizontal guide 522. The upper ends of the guide rods 53 extend to the ground surface along the upper backing piles 1b. One end of an upper girder lifting rope 515 is engaged with an upper rope engaging pin 514 provided on the side of the upper horizontal guide 512 of the upper girder 51. The upper girder lifting rope 515 is placed along the upper support pile 1b, and the other end is exposed to the ground surface. Similarly, one end of a lower girder lifting rope 525 is engaged with a lower rope engaging pin 524 provided on the side surface of the lower horizontal guide 522 of the lower girder 52. The lower girder lifting rope 525 is also placed along the upper bracing pile 1b, and the other end is exposed to the ground surface. When the upper girder lifting rope 515 and the lower girder lifting rope 525 are wound up on the ground surface, the upper girder 51 and the lower girder 52 rise. Also, when the upper girder lifting rope 515 and the lower girder lifting rope 525 are slackened, the upper girder 51 and the lower girder 52 fall due to their own weight. By providing two guide rods 53 at a specified interval in the front-to-rear direction, the upper girder 51 and the lower girder 52 can move up and down while maintaining a constant angle without rotating relative to the support pile 1. Since the upper girder 51 and the lower girder 52 are suspended by the upper girder lifting ropes 515 and the lower girder lifting ropes 525, respectively, it is preferable that the upper rope locking pin 514 and the lower rope locking pin 524 are respectively protruded at the center of gravity in the front-to-rear direction of the upper girder 51 and the lower girder 52. Since the upper girder 51 has an engagement part 516 (described later) on the front surface of the upper cross girder 511, the center of gravity of the upper girder 51 is located forward of the lower girder 52, and the upper girder lifting ropes 515 and the lower girder lifting ropes 525 do not interfere with each other. In addition, binding material engagement pins 54 are protrudingly provided on the side surfaces of the upper horizontal guide 512 and the lower horizontal guide 522, and binding material 55 is looped above and below the upper and lower binding material engagement pins 54. The binding material 55 is then pulled up from the ground surface to tighten the loop, thereby holding the upper girder 51 and the lower girder 52 together (Figure 7). The binding material 55 is, for example, a cable tie, and comprises a band 552 with teeth 551 formed on one side, and a groove 553 provided at the base of the loop through which the band 552 passes, as well as a check jig 554 having a check claw on one side of the inside of the groove 553 that engages with the teeth 551, so that even if the binding material 555 is loosened when being pulled up, the upper girder 51 and lower girder 52 of the integrated girder material 5 will not separate.

[0018] (4.2) Guide plate When erecting the backing piles 1, the upper girder 51 is positioned above the planned range of the anchor holes 3, and the lower girder 52 is positioned below the planned range of the anchor holes 3. A guide top plate 561 is provided above the upper horizontal guide 512 of the upper girder 51 in this position, and a guide bottom plate 562 is provided below the lower horizontal guide 522 of the lower girder 52. The guide top plate 561 and guide bottom plate 562 are fixed to the side panels 11 and reinforcing ribs 12. A guide side plate 563 is provided on the outside of the upper rope locking pin 514, lower rope locking pin 524, and binding material engagement pin 54 protruding from the upper girder 51 and lower girder 52 from the guide top plate 561 to the guide bottom plate 562. The guide rod 53 , the upper girder lifting rope 515 , the lower girder lifting rope 525 , and the binding material 55 pass through the guide top plate 561 . The lower end of the guide rod 53 is fixed to the guide bottom plate 562, and is detachably fixed, for example, by making the lower end of the guide rod 53 male-threaded and screwing it into a female thread provided in the guide bottom plate 562.

[0019] (4.3) Engagement Part An engagement portion 516 having a triangular cross section is provided on the front surface of the upper cross beam 511 of the upper beam 51 (FIG. 8(a)). The engaging portion 516 has an upper surface 516a that is horizontal and a front surface 516b that is vertical. When the engaging portion 516 is fitted into the notch of the side plate 11, the upper surface 516a abuts against the horizontal side 111a and the front surface 516b abuts against the vertical side 111b. Depending on the shapes of the upper cross beam 511, the lower cross beam 521 and the rear side of the engagement portion 516, the engagement portion 516 may be provided on the front surface of the lower cross beam 521, not limited to the front surface of the upper cross beam 511 (FIG. 8(b)). Alternatively, the spacer may be provided on either the upper beam 51 or the lower beam 52 rather than being divided into upper spacer 513 and lower spacer 523 (lower spacer 523 on lower beam 52 in FIG. 8(b)).

[0020] (5) Engagement jig and anti-twist tube (Fig. 9, Fig. 10) The engagement jig 6 is connected to the tip of the tendon 2. The tendon 2 and engagement jig 6 are inserted into the anchor hole 3 by pushing the engagement jig 6 into the anchor hole 3 using the anti-twist tube 7 provided behind the engagement jig 6. In explaining the engagement jig 6 and the anti-twist tube 7, the direction toward the engagement jig 6 in the axial direction of the tendon 2 is referred to as the front, and the opposite direction as the rear. The engagement jig 6 is cylindrical, and the tension rod 2 is inserted from the rear into an insertion hole 62 of a locking plate 61 provided on the rear side, and a crimping grip 63 provided at the tip of the tension rod 2 prevents the tension rod 2 from moving rearward, connecting the tension rod 2 to the engagement jig 6. In this embodiment, two tension rods 2 are connected to the engagement jig 6 horizontally. The anti-twist tube 7 is a long, for example cylindrical member, and has a tension member insertion tube 71 inside, through which the tension member 2 passes, and a fixing plate 72 that fixes the tension member insertion tube 71 to the anti-twist tube 7. By inserting the tension member 2 into the tension member insertion tube 71 fixed to the anti-twist tube 7, the tension members 2 in this embodiment are inserted into the anchor holes 3 while remaining in a horizontal state. The anti-twist tubes 7 can be connected in the axial direction via a connecting tube 73. In this embodiment, the outer periphery of the rear end of the front anti-twist tube 7 and the outer periphery of the tip of the rear anti-twist tube 7 are female-threaded, and the front and rear anti-twist tubes 7 are connected by the connecting tube 73 having female-threaded ends. In this case, one end of the anti-twist tube 7 and the connecting tube 73 are positive-threaded and the other end is negative-threaded, so that the front and rear anti-twist tubes 7 can be connected by simply rotating the connecting tube 73.

[0021] (6) Connection method between the support pile and the tendon Next, a method for connecting the support pile 1 and the tendon 2 will be described.

[0022] (6.1) Insertion of the support piles (Fig. 11, Fig. 12) Holes are drilled on the rear surface of the retaining wall W for the supporting piles, and the supporting piles 1 are inserted and erected. At this time, the upper girder 51 is positioned at the guide top plate 561, and the lower girder 52 is positioned at the guide bottom plate 562, and the upper girder lifting rope 515 and the lower girder lifting rope 525 are held in place so as not to slacken.

[0023] (6.2) Drilling anchor holes A ground anchor drilling machine is used to drill holes 3 for the anchors at a 45 degree angle downward from the side of the retaining wall W (Fig. 13). A normally used bit casing (not shown) is used for drilling the holes. The anchor holes 3 penetrate the front surface of the protective pipe 16, pass between the side plates 11 of the middle portion 1c, penetrate the protective pipe 16 at the rear surface, and are drilled rearward a predetermined length.

[0024] (6.3) Insertion of engagement jig and tendon The engaging jig 6 with the tension member 2 connected to it is pushed into the drilling casing of the anchor hole 3 while the anti-twist tube 7 is connected to the rear part at unit length, and inserted until the tip reaches the tip of the anchor hole 3 (Figure 13).

[0025] (6.4) Engagement of upper and lower girders with tendons The drilling casing and the anti-twist tube 7 for the anchor hole 3 are pulled back from the range of the back pile 1 (Fig. 14). At this time, the rotation of the drilling casing may cause the tension rod 2 inserted in the anchor hole 3 to rotate as well, but the position of the tension rod insertion tube 71 of the anti-twist tube 7 connected to the mouth of the anchor hole 3 is manipulated to correct the position so that the two tension rods 2 are aligned horizontally. Next, the upper girder lifting rope 515 of the upper girder 51 is loosened, and the upper girder 51 is lowered until it contacts the tendon 2, and the lower girder lifting rope 525 of the lower girder 52 is wound up, and the lower girder 52 is raised until the lower horizontal guide 522 of the lower girder 52 contacts the upper horizontal guide 512 of the upper girder 51. Then, the binding material 55 is pulled up, and the upper girder 51 and the lower girder 52 are integrated with the tendon 2 sandwiched between them. The upper girder lifting rope 515, the lower girder lifting rope 525, and the binding material 55 can be easily operated from the ground to integrate the upper girder 51 and the lower girder 52. Even if the tendon 2 between the pulled back anti-twist tube 7 and the engagement jig 6 is twisted from the horizontal, the tendon 2 can be corrected to a horizontal state by sandwiching it between the upper girder 51 and the lower girder 52 and further tightening it with the binding material 55. After that, the drilling casing and the anti-twist tubes 7 are all pulled out and removed. At this time, the tendon 2 does not twist because its tip is sandwiched between the upper girder 51 and the lower girder 52, which are restrained from rotating by the guide rod 53. In addition, the upper girder 51 and the lower girder 52 are integrated with the binding material 55 to sandwich the tendon 2, so that the tendon does not come off the tendon 2.

[0026] (6.5) Connection of tendons and bulwarks The lower end of the guide rod 53 is removed from the guide bottom plate 562, and the guide rod 53 is pulled out from the ground. Then, the tendon 2 is pulled out from the mouth of the anchor hole 3, and the engaging jig 6 is brought into contact with the integrated upper girder 51 and lower girder 52 (FIG. 15), and then pulled back until it touches the side plate 11. If the triangular engagement portion 516 on the front surface of the upper girder 51 does not hit the apex formed by the horizontal side 111a and the inclined side 111c of the cutout 111 in the side panel 11, the engagement portion 516 fits directly into the cutout 111, and the upper girder 51 and the lower girder 52 are fixed (FIG. 16). If the engagement portion 516 hits the apex, the engagement portion 516 is guided upward and forward and upward by the apex and the inclined side 111c, and fits into the cutout 111. By simply manipulating the upper girder 51 and the lower girder 52 and pulling back the tension member 2, the upper girder 51 and the lower girder 52 can be fitted into the middle part 1c, and the tension member 2 and the bracing pile 1 can be easily connected.

[0027] (6.6) Construction of Earth Retaining Structure The retaining structure is constructed by applying tension to the tendon 2 from the retaining wall W side and fixing it to a base 8 provided on the retaining wall W, and filling the anchor hole 3 from the retaining wall W side with filler 4 and allowing it to solidify. Since the tension member 2 is sandwiched from above and below between the upper girder 51 and lower girder 52 of the girder 5, the axis of force when tension is applied to the tension member 2 becomes the center of the girder 5, so no moment due to eccentricity is generated and the size of each component can be minimized.

[0028] In the present invention, the retaining pile 1 and the tension member 2 can be connected by operating the tension member 2 at the mouth of the anchor hole 3 on the retaining wall W side, and by operating the upper girder lifting rope 515, the lower girder lifting rope 525, and the binding material 55 on the ground, eliminating the need for excavation on the back of the retaining wall W or connection work at the connection part between the retaining pile 1 and the tension member 2 underground. By applying the present invention, a retaining structure can be constructed even in cases where excavation of the back of the retaining wall W would affect the surrounding ground, or where excavating the ground up to the connecting part to carry out connecting work would be dangerous.

[0029] [Example 2] (1) In the case of installation of two or more stages of tendons In the above-mentioned embodiment 1, the tendon 2 is installed in one stage, and the angle is set to 45 degrees. However, when the tension rod 2 is used in two or more stages, the angle of the tension rod 2 can be set to less than 45 degrees as shown in Figure 17, so that it can be connected to a retaining pile 1' located closer to the retaining wall W at a position deeper than the first stage of tension rod 2. If the angle of the tendon 2 is less than 45 degrees, this can be accommodated by adjusting the angle of each side of the notch 111 in the side panel 11 and the inclination angles of the upper girder 51 and lower girder 52 to match the angle of the tendon 2.

[0030] [Other Examples] In the above-described embodiment, the intermediate portion 1c is surrounded by the top plate 14, the bottom plate 15, and the protective tube 16. However, if there is no risk of the upper girder 51 or other equipment becoming buried due to the wall of the hole through which the backing pile 1 is inserted peeling off, the backing pile 1 and the tension member 2 can be connected even in a configuration that does not have the top plate 14, the bottom plate 15, or the protective tube 16. In addition, in the above-described embodiment, the upper girder 51 and the lower girder 52 are raised by winding up the upper girder lifting rope 515 and the lower girder lifting rope 525, and lowered by their own weight by loosening them, but this is not limited to this, and any configuration may be used as long as the upper girder 51 and the lower girder 52 can be raised and lowered by operating the upper girder lifting rope 515 and the lower girder lifting rope 525 on the ground surface. [Explanation of symbols]

[0031] 1 support pile, 1a lower support pile, 1b upper support pile, 1c middle part, 11 side plate, 111 notch, 12 reinforcing rib, 13 reinforcing plate, 14 top plate, 15 bottom plate, 16 protection pipe, 17 bypass pipe, 18 rope protection pipe 2 Tensors 3 Anchor holes 4 Filling material 5 girder material, 51 upper girder, 511 upper cross girder, 512 upper horizontal guide, 512a guide rod insertion hole, 513 upper spacer, 514 upper rope locking pin, 515 upper girder lifting rope, 516 engagement part 52 Lower girder, 521 Lower cross girder, 522 Lower horizontal guide, 522a Guide rod insertion hole, 523 Lower spacer, 524 Lower rope locking pin, 525 Lower girder lifting rope 53 guide rod, 54 binding material engagement pin, 55 binding material, 551 teeth, 552 band, 553 groove, 554 check jig, 561 guide top plate, 562 guide bottom plate, 563 guide side plate 6 Engagement jig, 61 Locking plate, 62 Insertion hole, 63 Crimping grip 7 Anti-twist tube, 71 Tendon insertion tube, 72 Fixing plate, 73 Connecting tube 8 Pedestal

Claims

1. A method for connecting a retaining pile to a tension member, the method comprising the steps of: connecting a retaining pile provided on the rear surface of a retaining wall that provides an excavation space on the front surface thereof; and a tension member that connects the retaining wall to the retaining pile; The support pile is composed of a lower support pile and an upper support pile arranged at a predetermined interval above and below, and an intermediate part composed of side plates that fix both sides of the lower support pile and the upper support pile, The side plate of the middle part of the pile has a sawtooth cut having an inclined side inclined with respect to the horizontal at the rear edge, an upper girder capable of descending along the support pile, the upper girder having an upper cross beam, an upper horizontal guide arranged horizontally, an upper girder hoisting rope having one end fixed to the upper horizontal guide and arranged along the support pile with the other end exposed to the ground surface, and an engagement portion capable of fitting into the notch; a lower girder located below the upper girder, capable of ascending along the support pile, the lower girder having a lower cross beam, a lower horizontal guide arranged horizontally, and a lower girder hoisting rope having one end fixed to the lower horizontal guide and arranged along the support pile with the other end exposed to the ground surface; and a guide rod inserted through the upper horizontal guide and the lower horizontal guide, arranged vertically along the support pile, and having an upper end exposed to the ground surface, Anchor holes are drilled diagonally downward from the retaining wall side toward the middle part of the retaining pile, The tension member is inserted into the anchor hole together with an engagement jig having a tip fixed thereto, At the ground surface, the upper girder lifting rope is loosened to lower the upper girder along the guide rod, and at the ground surface, the lower girder lifting rope is wound up to raise the lower girder along the guide rod, and girders formed integrally with the upper girder and the lower girder are placed above and below the tension material fixed to the engagement jig; The tension member and the engagement jig are pulled back to engage the engagement portion of the girder with the notch of the support pile, and the support pile and the tension member are connected via the girder. A method for connecting the support piles and tendons.

2. The notch includes a horizontal side extending horizontally from the rear edge of the side plate toward the front, a vertical side extending vertically downward from an end of the horizontal side, and an inclined side extending approximately parallel to the anchor hole from a lower end of the vertical side to the rear edge of the side plate, The engaging portion is triangular in cross section and abuts against the horizontal side and the vertical side when fitted into the notch. A method for connecting abutments and tendons according to claim 1.

3. In the step of inserting the engaging jig and the tendon into the anchor hole, The engagement jig is pushed into the anchor hole by a twist prevention tube provided on the rear side of the engagement jig, At this time, the tendon is inserted into a tendon insertion tube provided in the twist prevention tube. A method for connecting abutments and tendons according to claim 1 or 2.

4. The intermediate portion has a top plate at an upper end and a bottom plate at a lower end, The space between the top plate and the bottom plate is surrounded by a tubular protective tube, The anchor hole is provided through the protective tube. A method for connecting abutments and tendons according to claim 3.

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