JP2024018308A - Earth retaining wall, and construction method of the same - Google Patents

Abstract

To provide an earth retaining wall in which a parent pile, an auxiliary pile, and a connecting member are not exposed.SOLUTION: An earth retaining wall 1 comprises: a plurality of parent piles 2 inserted into an earth retaining wall construction ground at predetermined intervals; a plurality of horizontal sheet piles 3 installed between neighboring parent piles 2; and a plurality of auxiliary piles 4 inserted into a rear side ground from a side position of the parent piles 2 and connected to the parent piles 2 via connecting members 5. The horizontal sheet piles 3 include: a first horizontal sheet pile 31 whose both longitudinal ends are supported by the parent pile 2; and a second horizontal sheet pile 32 whose longitudinal ends are supported by the auxiliary pile 4 or the connecting members 5. The first horizontal sheet pile 31 and the second horizontal sheet pile 32 comprise log materials 311, 321 covering front sides of the parent pile 2, the auxiliary pile 4, and the connecting member 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to an earth retaining wall including a main pile, a horizontal sheet pile, and an auxiliary pile, and a construction method thereof.

Patent Document 1 describes a plurality of parent piles that are inserted into the earth retaining wall construction ground at predetermined intervals, a plurality of horizontal sheet piles that are installed between adjacent parent piles, and a plurality of side piles that are inserted into the ground on the back side from the side position of the parent pile. An earth retaining wall is described that includes a plurality of auxiliary piles (inserted piles) that are inserted into the main pile and connected to the parent pile via a connecting member. In this type of earth retaining wall, the earth pressure in the ground on the back side acting on the auxiliary pile is converted into a moment in the direction of pressing the parent pile against the ground on the back side, so it is possible to shorten the length of the embedded part of the parent pile. , there is an advantage that the cross-sectional dimension of the parent pile can be reduced.

Japanese Patent Application Publication No. 2017-197950

However, in the earth retaining wall described in Patent Document 1, the front sides of the main pile, auxiliary pile, and connecting member are exposed, so it is difficult to apply it to forest road maintenance from the viewpoint of landscape protection.

The present invention was created with the aim of solving these problems in view of the above-mentioned circumstances, and the invention of claim 1 is directed to a plurality of retaining walls inserted at predetermined intervals into the earth retaining wall construction ground. A pile, a plurality of horizontal piles installed between the adjacent parent piles, and a plurality of horizontal sheets inserted from the side position of the parent pile into the ground on the back side and connected to the parent pile via a connecting member. A retaining wall comprising: a first horizontal sheet pile whose longitudinal ends are supported by the parent pile; and a first horizontal sheet pile whose longitudinal ends are supported by the auxiliary pile or the connecting member. the first horizontal sheet pile and the second horizontal sheet pile are provided with log materials that cover the front sides of the parent pile, the auxiliary pile, and the connecting member.
Further, the invention of claim 2 is the earth retaining wall according to claim 1, in which the second horizontal sheet pile includes the log material, a support material along the back side of the log material, and the log material and the support material along the back side of the log material. a plurality of connection bolts that connect the support member, the support member having both longitudinal ends engaged with either the auxiliary pile or the connection member from the back side; and the support member and both longitudinal ends thereof. By connecting the log material with the section attached to the front side of the parent pile via the plurality of connecting bolts, both ends in the longitudinal direction of the second horizontal pile can be attached to the auxiliary pile or the connecting bolt. supported by the member.
Further, the invention of claim 3 is the earth retaining wall according to claim 1 or 2, wherein the parent pile has an H-shape integrally having a pair of flanges and a web connecting the pair of flanges. The log material of the first horizontal sheet pile is made of steel, and the log material of the first horizontal sheet pile has a concave groove that can be engaged with the flange of the parent pile at both ends in the longitudinal direction, and the concave groove is formed of the first horizontal sheet pile. It has a shape that allows it to engage the adjacent parent pile from the front side while maintaining the log in a horizontal position.
Further, the invention of claim 4 is the earth retaining wall according to claim 1 or 2, wherein the first horizontal sheet pile includes the log material, a support material along the back side of the log material, and the log material. and a plurality of connecting bolts connecting the supporting material, the supporting material having both longitudinal ends engaged with the parent pile from the rear side, and the supporting material having both longitudinal ends thereof engaged with the parent pile from the rear side. By connecting the log material attached to the front side of the first horizontal sheet pile through the plurality of connecting bolts, both ends of the first horizontal sheet pile in the longitudinal direction are supported by the parent pile.
Further, the invention of claim 5 provides a plurality of parent piles inserted into the earth retaining wall construction ground at predetermined intervals, a plurality of horizontal piles installed between the adjacent parent piles, and a side position of the parent piles. A method for constructing an earth retaining wall comprising: a plurality of auxiliary piles that are inserted into the ground on the back side and connected to the parent pile via connecting members, the horizontal sheet piles having two ends at both ends in the longitudinal direction; includes a first horizontal sheet pile supported by the parent pile, and a second horizontal sheet pile whose longitudinal ends are supported by the auxiliary pile or the connecting member, and the method for constructing the earth retaining wall includes: a parent pile insertion step of inserting the parent piles into the construction ground at predetermined intervals; an excavation step of excavating the retaining wall construction ground along the front side of the parent piles; A first horizontal sheet pile installation step of installing a sheet pile and covering the front side of the parent pile with a log material included in the first horizontal sheet pile, and inserting the auxiliary pile from the side position of the parent pile to the ground on the back side. an auxiliary pile insertion step in which the auxiliary pile is connected to the parent pile via the connection member; a step in which the second horizontal sheet pile is installed between the adjacent parent piles; The method includes a second horizontal sheet pile installation step of covering the front side of the parent pile, the auxiliary pile, and the connecting member with a log material provided in the sheet pile.

According to the invention of claim 1, the horizontal sheet piles include a first horizontal sheet pile whose longitudinal ends are supported by parent piles, and a second horizontal sheet pile whose longitudinal ends are supported by auxiliary piles or connecting members. Since it includes the following, not only can horizontal sheet piles be appropriately installed at locations where auxiliary piles and connecting members are installed, but also the support load of the horizontal sheet piles can be dispersed. In addition, since the first horizontal sheet pile and the second horizontal sheet pile are equipped with log materials that cover the front side of the main pile, auxiliary pile, and connecting member, it prevents the landscape from being spoiled by retaining walls and is suitable for use in forest road maintenance, etc. can be promoted. Furthermore, if thinned wood is used as log material, forest resources can be used effectively.
Moreover, according to the invention of claim 2, the second horizontal sheet pile can be installed more appropriately at the installation location of the auxiliary pile and the connecting member.
Further, according to the invention of claim 3, not only can the first horizontal sheet pile be easily constructed from a log material having concave grooves at both ends in the longitudinal direction, but also the first horizontal sheet pile can be maintained in a horizontal position while adjoining It is possible to install the first horizontal sheet pile from the front side with respect to the parent pile, and the ease of installing the first horizontal sheet pile can be improved.
Further, according to the invention of claim 4, the configurations of the first horizontal sheet pile and the second horizontal sheet pile can be made similar, so that construction cost can be reduced by using common log materials, and construction efficiency can be improved by standardizing the construction procedure. can be improved.
Moreover, according to the invention of claim 5, the earth retaining wall of the invention can be appropriately constructed.

FIG. 1 is a schematic perspective view showing the structure of an earth retaining wall according to an embodiment of the present invention. It is a schematic perspective view of the earth retaining wall which abbreviate|omits the horizontal sheet pile. It is a perspective view showing the state where a connecting member is attached to a parent pile. It is a perspective view which shows the state which connected the auxiliary pile to the parent pile via the connection member. It is a perspective view which shows the state where the grip margin member was removed from the auxiliary pile. It is a front view which shows the state which connected the auxiliary pile to the parent pile via the connection member. It is a top view which shows the state which connected the auxiliary pile to the parent pile via the connection member. It is a side view which shows the state which connected the auxiliary pile to the parent pile via the connection member. (a) is a YY cross-sectional view of FIG. 6, and (b) is a YY cross-sectional view showing a state in which the grip member has been removed from the auxiliary pile. It is a perspective view of a connection member. It is a horizontal sectional view of the retaining wall showing the installed state of the first horizontal sheet pile. It is a horizontal cross-sectional view of the earth retaining wall explaining the installation method of the 1st horizontal sheet pile. It is a horizontal sectional view of the retaining wall showing the installed state of the second horizontal sheet pile. It is a horizontal sectional view of the earth retaining wall explaining the installation method of the 2nd horizontal sheet pile. It is an explanatory view of the main pile insertion process of the earth retaining wall. It is an explanatory view of the primary excavation process of the earth retaining wall, and the 1st horizontal sheet pile installation process. It is an explanatory view of the secondary excavation process of the earth retaining wall. It is an explanatory view of an auxiliary pile insertion process of an earth retaining wall, and an auxiliary pile connection process. It is an explanatory view of the second horizontal sheet pile installation process of the earth retaining wall. It is an explanatory view of the tertiary excavation process of the earth retaining wall. It is an explanatory view of the first horizontal sheet pile installation process of the earth retaining wall. It is a horizontal cross-sectional view of the earth retaining wall which shows the installation state of the 1st horizontal sheet pile concerning a modification. It is a horizontal sectional view of the retaining wall explaining the installation method of the 1st horizontal sheet pile concerning a modification.

[Earth retaining wall configuration]
Embodiments of the present invention will be described below based on the drawings. In FIGS. 1 and 2, 1 is an earth retaining wall, and the earth retaining wall 1 is installed between a plurality of main piles 2 inserted at predetermined intervals into the earth retaining wall construction ground and between adjacent main piles 2. It includes a plurality of horizontal sheet piles 3 and a plurality of auxiliary piles 4 that are inserted into the ground on the back side from the side position of the main pile 2 and connected to the main pile 2 via a connecting member 5. First, the structure of the retaining wall 1 excluding the horizontal sheet piles 3 will be explained with reference to FIGS. 1 to 10.

As shown in FIGS. 1 to 9, the parent pile 2 is normally inserted (driven) into the earth retaining wall construction ground in the vertical direction. The members used are H-shaped ropes that are commonly used for main piles, sheet piles, earth retaining walls, and the like. The parent pile 2 made of H-shaped steel integrally includes a pair of flanges 2a and a web 2b that connects the pair of flanges 2a, with the web 2b serving as the groove bottom and the pair of flanges 2a serving as the groove side. It has a pair of grooves 2c. A plurality of bolt insertion holes (not shown) for connecting the connecting member 5 via the first bolt B1 are formed in the web 2b. The bolt insertion holes may be formed before the main pile 2 is inserted into the ground, or after the main pile 2 is inserted into the ground, the bolt insertion holes may be formed at the timing when the connecting member 5 is fastened to the main pile 2.

The cross-sectional dimensions of the H-shaped rope constituting the parent pile 2 are selected depending on the wall height, but those of approximately H300 to H500 are often used. Moreover, the parent piles 2 are inserted into the ground at predetermined intervals along the boundary line of the ground to be excavated before excavation of the ground for construction of the retaining wall. The insertion interval is approximately 1.0 to 2.0 m.

The auxiliary piles 4 are installed in one or more stages in the height direction. FIG. 2 shows an example in which the auxiliary piles 4 are installed in two stages in the vertical direction. As the auxiliary pile 4, an H-beam steel having a cross section of approximately H200 to H400 is used. The auxiliary pile 4 made of H-beam steel integrally includes a pair of flanges 4a and a web 4b that connects the pair of flanges 4a, with the web 4b serving as the groove bottom and the pair of flanges 4a serving as the groove side. It has a pair of grooves 4c. The number of stages and the insertion depth of the auxiliary piles 4 are determined by design calculations based on the allowable amount of deformation at the top of the main pile 2, but in normal cases, they are installed in about 1 to 4 stages in the height direction, The insertion depth is approximately 2 to 5 m.

The auxiliary piles 4 are installed for each parent pile 2 at each predetermined excavation stage as the excavation progresses. Although it is possible to install one pile per location, it is preferable to install a set of left and right piles on both sides of the parent pile 2 per location, as shown in the figure, in order to ensure a large moment. For installation, the main pile 2 is inserted into the ground on the back side along a substantially horizontal direction from the side position, and the insertion source side is connected to the main pile 2 via the connecting member 5. The direction in which the auxiliary piles 4 are inserted is basically horizontal, but may be installed at a slight inclination, including construction errors.

As shown in FIGS. 4 to 9, a plurality of reinforcing members 41 to 44 are provided on the base end side of the auxiliary pile 4 in the insertion direction, and are welded to the pair of flanges 4a and web 4b. These reinforcing members 41 to 44 suppress deformation of the base end side of the auxiliary pile 4 in the insertion direction, and ensure the transmission of moment from the auxiliary pile 4 to the main pile 2.

The reinforcing members 41 to 44 include a first reinforcing member 41 that covers the base end surface of the auxiliary pile 4 in the insertion direction. The first reinforcing member 41 is welded to the base end surface of the auxiliary pile 4 in the insertion direction so as to close the pair of grooves 4c of the auxiliary pile 4. Further, the first reinforcing member 41 is provided with a bolt insertion hole 41a for connecting a gripping margin member 6, which will be described later.

Further, the reinforcing members 41 to 44 include a plurality of second reinforcing members 42 to 44 provided within the pair of grooves 4c of the auxiliary pile 4 and near the fastening position with the connecting member 5.

When inserting the auxiliary pile 4 into the ground on the back side using a heavy insertion machine (not shown), a gripping allowance for the heavy insertion machine is required on the base end side of the auxiliary pile 4 in the insertion direction. As shown in FIGS. 4 to 9, in the earth retaining wall construction method of this embodiment, the auxiliary pile 4 is removably attached to the base end in the insertion direction, and when the auxiliary pile 4 is inserted into the ground on the back side, the auxiliary A gripping allowance member 6 is used, which serves as a gripping allowance for the heavy machine for insertion into which the auxiliary pile 4 is inserted, and is removed from the auxiliary pile 4 after insertion.

The grip member 6 is an H-shaped steel integrally having a pair of flanges 6a and a web 6b connecting the pair of flanges 6a, and is an H-shaped steel having the same cross section as the auxiliary pile 4. A gripping allowance side joint member 61 is welded to the H-shaped steel constituting the gripping allowance member 6 so as to cover the distal end surface in the insertion direction. A plurality of bolt insertion holes (not shown) for fastening to the first reinforcing member 41 of the auxiliary pile 4 via a plurality of third bolts B3 are formed in the gripping side joint member 61.

The connecting members 5 are used as a pair, upper and lower, for one auxiliary pile 4. The pair of upper and lower connecting members 5 are fastened to the main pile 2 via a plurality of first bolts B1 and first nuts N1 so as to be lined up in the vertical direction with an interval equal to the vertical width dimension of the auxiliary pile 4. The mutually opposing portions of the pair of upper and lower connecting members 5 function as guides when inserting the auxiliary pile 4 into the ground on the back side. In addition, opposing portions of the pair of upper and lower connecting members 5 that face each other are fastened to the flange 4a of the inserted auxiliary pile 4 via a plurality of second bolts B2 and second nuts N2.

Specifically, as shown in FIG. 10, the connecting member 5 of this embodiment has a main pile fastening plate part 51 fastened to the web 2b of the main pile 2, and a flange 4a of the auxiliary pile 4. The auxiliary pile fastening plate part 52, the plurality of connecting plate parts 53 that integrally connect the main pile fastening plate part 51 and the auxiliary pile fastening plate part 52, and the reinforcement that integrally connects the plurality of connecting plate parts 53 to each other. The plate portion 58 is formed into a box shape.

The main pile fastening plate part 51 is formed with a plurality of bolt insertion holes 51a through which the first bolts B1 can be inserted, and the auxiliary pile fastening plate part 52 is formed with a plurality of bolt insertion holes 52a through which the second bolts B2 can be inserted. is formed. Further, the connecting member 5 has an opening 56 that communicates with the inside of the box, and the bolts B1, B2 and nuts N1, N2 are fastened through this opening 56.

The second bolt B2 of this embodiment connects mutually opposing opposing parts (auxiliary pile fastening plate parts 52) of a pair of upper and lower connecting members 5 and the auxiliary pile 4 (upper and lower flanges 4a) inserted between the opposing parts. It consists of a long bolt that penetrates vertically. According to the second bolt B2 made of a long bolt, it is possible not only to reduce the number of second bolts B2 necessary for fastening the auxiliary pile 4 to the pair of upper and lower connecting members 5, but also to reduce the number of second bolts B2 necessary for fastening the auxiliary pile 4 to the upper and lower connecting members 5. can be done at the same time. Furthermore, work such as placing (welding) a nut in advance on the inner surface of the flange of the auxiliary pile 4, which becomes a closed space during the connection work, is no longer necessary, so the workability of the retaining wall 1 can be greatly improved.

Further, as shown in FIG. 10, the pair of upper and lower connecting members 5 are integrally connected via an end plate 57 to form a connecting unit U, and are fastened to the main pile 2 in the state of the connecting unit U. Ru. In other words, the pair of upper and lower connecting members 5 are not individually fastened to the main pile 2, but are integrally fastened to the main pile 2 as a unit that is welded to the end plate 57 by measuring the interval accurately in advance. Ru.

[Yokoya Sheet]
Next, the horizontal sheet pile 3 will be explained with reference to FIGS. 11 to 14. The horizontal sheet piles 3 are plate materials that are sequentially installed between adjacent parent piles 2 as excavation is performed, and serve as earth retention. The horizontal sheet piles 3 include a first horizontal sheet pile 31 whose longitudinal ends are supported by the parent piles 2, and a second horizontal sheet pile 32 whose longitudinal ends are supported by the auxiliary piles 4 or the connecting members 5. is included. The first horizontal sheet pile 31 and the second horizontal sheet pile 32 each include log materials 311 and 322 that cover the front sides of the main pile 2, the auxiliary pile 4, and the connecting member 5.

To describe it specifically, the first horizontal sheet pile 31 of this embodiment is configured using a log material 311 having a circular cross section, and a flange 2a of the parent pile 2 is provided at both ends of the log material 311 in the longitudinal direction. An engageable groove 311a is formed. As shown in FIG. 11, when the first horizontal sheet pile 31 made of log material 311 is installed between adjacent parent piles 2 by engaging the grooves 311a at both ends with the flanges 2a of the parent piles 2, Not only can it function as an earth retaining material by covering the front side of the back ground, but it can also function as a cover material for covering the front side of the parent pile 2. In addition, you may fill with the filler J between the back ground and the horizontal sheet pile 3 (1st horizontal sheet pile 31, 2nd horizontal sheet pile 32).

When such a first horizontal sheet pile 31 is installed between two adjacent parent piles, it is tilted so that one end in the longitudinal direction is higher and the other end in the longitudinal direction is lower. By inserting it and then setting it in a horizontal position, it is possible to engage the grooves 311a at both ends with the flanges 2a of the adjacent parent pile 2, but the grooves 311a of the first horizontal sheet pile 31 of this embodiment has a shape that can be engaged with the adjacent parent pile 2 from the front side while maintaining the first horizontal sheet pile 31 in a horizontal position. Thereby, even in a situation where there is no space for vertically tilting, it becomes possible to install the first horizontal sheet pile 31 between the adjacent parent piles 2.

Specifically, the groove depth L1 of the groove 311a of the first horizontal sheet pile 31 is deeper than the engagement length L2 with the flange 21a. Moreover, a notch 311b is formed on the back side of the groove 311a to make the length L3 of the back surface of the first horizontal sheet pile 31 shorter than the length L4 of the front surface of the first horizontal sheet pile 31. . Furthermore, one of the grooves 311a has a groove side surface on the front side that is an inclined surface 311c whose groove width increases toward the outer side in the longitudinal direction.

According to the first horizontal sheet pile 31, as shown in FIG. 12, while maintaining the first horizontal sheet pile 31 in a horizontal position, the concave groove 311a on the one end side in which the inclined surface 311c is formed is connected to one of the main piles. After deeply engaging the flange 2a of 2, the other end side of the first horizontal sheet pile 31 is pushed between the adjacent parent piles 2, and then, by sliding the first horizontal sheet pile 31 to the other end side, the so-called " It becomes possible to install the first horizontal sheet pile 31 between the adjacent parent piles 2 using the ``come and go'' method. In addition, the horizontal movement of the installed 1st horizontal sheet pile 31 is regulated by the 1st horizontal sheet pile 31 adjacent to the horizontal direction. For example, in the example shown in FIG. 12, the horizontal position of the first horizontal pile 31 can be defined by sequentially installing the first horizontal pile 31 on the left side.

As shown in FIGS. 13 and 14, the second horizontal sheet pile 32 includes a log material 321 having a semicircular cross section, a support material 322 such as an angle material or a channel material along the back side of the log material 321, and a log material 321. and a plurality of connection bolts 323 that connect the support member 322 to the support member 322.

Such a second horizontal sheet pile 32 has both ends in the longitudinal direction engaged with either the auxiliary pile 4 (for example, the second reinforcing member 43) or the connecting member 5 (for example, the connecting plate part 53) from the back side. By connecting the support material 322 in the state of being tilted and the log material 321 in the state of having both longitudinal ends aligned with the front side of the parent pile 2 via a plurality of connection bolts 323, the second horizontal sheet pile 32 is Both ends in the longitudinal direction are supported by auxiliary piles 4 or connecting members 5. The installed second horizontal sheet pile 32 not only functions as an earth retaining material by covering the front side of the back ground, but also functions as a cover material that covers the front side of the main pile 2, auxiliary pile 4, and connecting member 5. can be done. In addition, as shown in FIG. 14, the second horizontal pile 32 can also be installed in a so-called "come and go" method by inserting the support member 322 diagonally, while maintaining the horizontal attitude.

[Construction method of earth retaining wall]
Next, the construction procedure of the earth retaining wall 1 applied to forest road maintenance will be explained with reference to FIGS. 15 to 21. Note that illustration of the back ground is omitted in FIGS. 15 to 21.

The construction procedure for the retaining wall 1 shown in Figures 15 to 21 includes a parent pile insertion process (see Figure 15), a primary excavation process (see Figure 16), a first horizontal sheet pile installation process (see Figure 16), a secondary Excavation process (see Figure 17), auxiliary pile insertion process (see Figure 18), auxiliary pile connection process (see Figure 18), second horizontal sheet pile installation process (see Figure 19), tertiary excavation process (see Figure 20), A second first horizontal sheet pile installation process (see FIG. 21) is included.

As shown in FIG. 15, in the parent pile installation process, parent piles 2 are inserted into the ground at predetermined intervals along the excavation boundary line using a construction machine such as a pile driver.

As shown in FIG. 16, in the primary excavation step, the ground to be excavated is excavated along the parent pile 2 using an excavating machine such as a hydraulic excavator. As the excavation progresses, a first horizontal sheet pile installation step is carried out in which the first horizontal sheet piles 31 are installed between the parent piles 2, and the excavation is gradually carried out while retaining the earth. The installed first horizontal sheet pile 31 not only functions as an earth retaining material, but also functions as a cover material that covers the front side of the parent pile 2.

As shown in FIG. 17, in the secondary excavation process, the ground to be excavated is excavated to a position slightly deeper than the installation position of the auxiliary pile 4.

As shown in FIG. 18, in the auxiliary pile insertion step, the auxiliary pile 4 is inserted into the back ground using heavy insertion equipment. Specifically, prior to inserting the auxiliary pile 4, first, a pair of upper and lower connecting members 5 (connecting units U) are fixed to the left and right sides of the parent pile 2, respectively. This work involves arranging a pair of left and right connecting units U to sandwich the web 2b of the parent stake 2, and using a plurality of first bolts B1 and first nuts N1 to connect the left and right pair of connecting units U to the parent pile. This is done by fastening to the web 2b of the pile 2. Further, the gripping member 6 is attached to the base end of the auxiliary pile 4 to be inserted in the insertion direction using a plurality of third bolts B3 and third nuts N3.

Insertion of the auxiliary pile 4 is performed while gripping the web 6b of the gripping allowance member 6 with a heavy insertion machine. During insertion of the auxiliary stake 4, the auxiliary stake 4 is positioned between the pair of upper and lower connecting members 5, thereby causing the pair of upper and lower connecting members 5 to function as an insertion guide. After the insertion is completed, an auxiliary pile connecting step is performed in which the auxiliary pile 4 is fastened to the connecting member 5 using the plurality of second bolts B2 and second nuts N2. Thereafter, the grip member 6 is removed from the auxiliary stake 4.

As shown in FIG. 19, in the second horizontal sheet pile installation process, the second horizontal sheet piles 32 are installed between the parent piles 2. At this time, the second horizontal sheet pile 32 is installed in a state where it engages with the auxiliary pile 4 or the connecting member 5. The installed second horizontal sheet pile 32 not only functions as an earth retaining material, but also functions as a cover material that covers the front side of the main pile 2, the auxiliary pile 4, and the connecting member 5.

As shown in FIG. 20, in the tertiary excavation process, the ground is dug to the bottom (the forest road construction surface) of the ground to be excavated. Thereafter, as shown in FIG. 21, the retaining wall 1 is completed by carrying out the second first horizontal sheet pile installation process.

[Effects of embodiment]
According to the present embodiment configured as described above, a plurality of main piles 2 are inserted into the earth retaining wall construction ground at predetermined intervals, a plurality of horizontal sheet piles 3 are installed between adjacent main piles 2, The earth retaining wall 1 includes a plurality of auxiliary piles 4 that are inserted into the ground on the back side from the side positions of the piles 2 and connected to the main piles 2 via connecting members 5, and the horizontal sheet piles 3 are , includes a first horizontal sheet pile 31 whose longitudinal ends are supported by the parent pile 2, and a second horizontal sheet pile 32 whose longitudinal ends are supported by the auxiliary piles 4 or the connecting members 5. Not only can the horizontal sheet piles 3 be appropriately installed at the installation locations of the piles 4 and the connecting members 5, but also the supporting load of the horizontal sheet piles 3 can be dispersed.

Moreover, since the first horizontal sheet pile 31 and the second horizontal sheet pile 32 are provided with log materials 311 and 321 that cover the front sides of the main pile 2, the auxiliary pile 4, and the connecting member 5, the landscape is not spoiled by the retaining wall 1. can be prevented and its application to forest road maintenance etc. can be promoted. Furthermore, if thinned wood is used as the logs 311 and 321, forest resources can be used effectively.

Further, the second horizontal sheet pile 32 includes a log material 321, a support material 322 along the back side of the log material 321, and a plurality of connection bolts 323 that connect the log material 321 and the support material 322, and A supporting member 322 whose both ends are engaged with either the auxiliary pile 4 or the connecting member 5 from the back side, and a log material 321 whose longitudinal ends are aligned with the front side of the main pile 2 By connecting them via a plurality of connecting bolts 323, both ends of the second horizontal sheet pile 32 in the longitudinal direction are supported by the auxiliary piles 4 or the connecting members 5, so that the installation locations of the auxiliary piles 4 and the connecting members 5 can be changed. The second horizontal sheet pile 32 can be installed more appropriately.

Moreover, the parent pile 2 is an H-beam steel integrally having a pair of flanges 2a and a web 2b that connects the pair of flanges 2a, and the log material 311 of the first horizontal sheet pile 31 is formed at both ends in the longitudinal direction. The groove 311a has a groove 311a that can be engaged with the flange 2a of the main pile 2, and the groove 311a maintains the log material 311 of the first horizontal sheet pile 31 in a horizontal position, and Since it has a shape that can be engaged from the front side, not only can the first horizontal sheet pile 31 be easily constructed from the log material 311 having grooves 311a at both ends in the longitudinal direction, but also the first horizontal sheet pile 31 can be maintained in a horizontal position. At the same time, it is possible to install the first horizontal sheet pile 31 from the front side with respect to the adjacent main pile 2, thereby improving the ease of installing the first horizontal sheet pile 31.

[Second embodiment]
Next, the first horizontal sheet pile 33 according to a modified example of the present invention will be explained with reference to FIGS. 22 and 23. However, for configurations common to the embodiments described above, the same reference numerals as in the embodiments described above may be used, and the explanation of the embodiments described above may be used.

The first horizontal sheet pile 33 of the modified example connects a log material 331 having a semicircular cross section, a supporting material 332 such as an angle material or a channel material along the back side of the log material 331, and the log material 331 and the supporting material 332. A plurality of connecting bolts 333 are provided.

The first horizontal sheet pile 33 of such a modified example includes a support member 332 whose longitudinal ends are engaged with the flange portion 2a of the main pile 2 from the back side, and a support member 332 whose longitudinal ends are engaged with the flange portion 2a of the main pile 2 from the back side. Both ends of the first horizontal sheet pile 33 in the longitudinal direction are supported by the parent pile 2 by connecting the log material 331 which is attached to the front side of the first horizontal sheet pile 33 via a plurality of connecting bolts 333. According to the first horizontal sheet pile 33 of such a modified example, the configurations of the first horizontal sheet pile 33 and the second horizontal sheet pile 32 can be made similar, so the construction cost can be reduced by making the log materials 311 and 331 common. , construction efficiency can be improved by standardizing construction procedures. In addition, as shown in FIG. 23, the first horizontal pile 33 of the modified example can also be installed in a so-called "come and go" method while maintaining the horizontal posture by inserting the support member 332 diagonally.

1 Retaining wall 2 Main pile 2a Flange 2b Web 2c Groove 3 Horizontal sheet pile 31 First horizontal sheet pile 311 Log material 311a Groove 311b Notch 311c Inclined surface 32 Second horizontal sheet pile 321 Log material 322 Support material 323 Connection bolt 33 First horizontal sheet pile Sheet pile 331 Log material 332 Support material 333 Connecting bolt 4 Auxiliary pile 4a Flange 4b Web 4c Groove 41 First reinforcing member 41a Bolt insertion hole 42 to 44 Second reinforcing member 5 Connecting member 51 Main pile fastening plate part 52 Auxiliary pile fastening plate part 53 Connecting plate portion 56 Opening portion 57 End plate 58 Reinforcement plate portion 6 Grip allowance member 6a Flange 6b Web 61 Grip allowance side joint member U Connection unit B1 First bolt B2 Second bolt B3 Third bolt

Claims (5)

A plurality of parent piles are inserted into the earth retaining wall construction ground at predetermined intervals,
A plurality of horizontal sheet piles installed between the adjacent parent piles,
An earth retaining wall comprising a plurality of auxiliary piles that are inserted into the ground on the rear side from a side position of the main pile and connected to the main pile via a connecting member,
The horizontal sheet pile is
a first horizontal sheet pile whose longitudinal ends are supported by the parent pile;
a second horizontal sheet pile whose longitudinal ends are supported by the auxiliary pile or the connecting member,
The first horizontal sheet pile and the second horizontal sheet pile are earth retaining walls including log materials that cover the front sides of the parent pile, the auxiliary pile, and the connecting member. The second horizontal sheet pile is
The log material;
a support material along the back side of the log;
A plurality of connection bolts connecting the log material and the support material,
The support member has both longitudinal ends engaged with either the auxiliary pile or the connecting member from the back side, and the support member has both longitudinal ends aligned with the front side of the parent pile. The earth retaining wall according to claim 1, wherein both ends of the second horizontal sheet pile in the longitudinal direction are supported by the auxiliary pile or the connecting member by connecting the logs with the plurality of connecting bolts. The parent pile is an H-beam that integrally includes a pair of flanges and a web that connects the pair of flanges,
The log material of the first horizontal sheet pile has grooves that can be engaged with the flanges of the parent pile at both ends in the longitudinal direction,
The earth retaining wall according to claim 1 or 2, wherein the groove has a shape that allows it to engage with the adjacent parent pile from the front side while maintaining the log material of the first horizontal sheet pile in a horizontal position. . The first horizontal sheet pile is
The log material;
a support material along the back side of the log;
A plurality of connection bolts connecting the log material and the support material,
A plurality of the support members have both longitudinal ends engaged with the parent pile from the back side, and the logs have both longitudinal ends aligned with the front side of the parent pile. The earth retaining wall according to claim 1 or 2, wherein both ends of the first horizontal sheet pile in the longitudinal direction are supported by the parent pile by connecting via a connecting bolt. A plurality of parent piles are inserted into the earth retaining wall construction ground at predetermined intervals,
A plurality of horizontal sheet piles installed between the adjacent parent piles,
A method for constructing an earth retaining wall comprising: a plurality of auxiliary piles inserted into the ground on the rear side from a side position of the parent pile and connected to the parent pile via a connecting member,
The horizontal sheet pile is
a first horizontal sheet pile whose longitudinal ends are supported by the parent pile;
a second horizontal sheet pile whose longitudinal ends are supported by the auxiliary pile or the connecting member,
The construction method of the earth retaining wall is as follows:
a parent pile insertion step of inserting the parent piles at predetermined intervals into the earth retaining wall construction ground;
an excavation step of excavating the earth retaining wall construction ground along the front side of the parent pile;
A first horizontal sheet pile installation step of installing the first horizontal sheet pile between the adjacent parent piles, and covering the front side of the parent pile with a log material included in the first horizontal sheet pile;
an auxiliary pile insertion step of inserting the auxiliary pile from a side position of the parent pile to the ground on the back side;
an auxiliary pile connecting step in which the auxiliary pile is connected to the parent pile via the connecting member;
installing the second horizontal sheet pile between the adjacent parent piles, and covering the front side of the parent pile, the auxiliary pile, and the connecting member with the log material included in the first horizontal sheet pile; Construction methods for retaining walls, including:

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