earth retaining wall

Abstract

To provide an earth retaining wall in which moment can be surely transmitted from auxiliary beams to soldier beams.SOLUTION: An earth retaining wall 1 is provided, comprising: a plurality of soldier beams 2 which are inserted at predetermined intervals into the earth retaining wall construction ground; and a plurality of auxiliary beams 4 which are inserted into the backside ground from the soldier beams 2 and are connected to the soldier beams 2 via a connection member 5. The connection member 5 is used as an upper and lower pair for one auxiliary beam 4. The upper and lower pair of connection members 5 is fastened to the soldier beams 2 via a plurality of bolts in such a manner that the connection members 5 are aligned vertically via an interval equivalent to the vertical width dimension of auxiliary beam 4. The opposing portions of the upper and lower pair connection members 5 facing each other act as a guide when inserting auxiliary beam 4 into the back side ground and are fastened to a flange 4a of the inserted auxiliary beam 4 via the plurality of bolts.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an earth retaining wall comprising parent piles, cross piles and auxiliary piles. [Background technology]

[0002] Patent Document 1 describes an earth-retaining wall comprising a plurality of parent piles inserted at predetermined intervals into the ground where the earth-retaining wall is to be constructed, a plurality of horizontal sheet piles installed between adjacent parent piles, and a plurality of auxiliary piles (inserted piles) inserted into the ground behind the parent piles from the sides thereof and connected to the parent piles via connecting members. With this type of earth-retaining wall, the earth pressure from the ground behind the auxiliary piles acting on the auxiliary piles is converted into a moment in the direction pressing the parent piles against the ground behind the parent piles, which has the advantage of shortening the length of the embedded portion of the parent piles and reducing the cross-sectional dimensions of the parent piles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-197950 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the retaining wall described in Patent Document 1, if the connection between the parent pile and the auxiliary pile is deformed by a moment, the moment will not be transmitted from the auxiliary pile to the parent pile, which may result in a reduction in the retaining function. [Means for solving the problem]

[0005] The present invention has been created in consideration of the above-mentioned circumstances and with the aim of solving these problems. The invention of claim 1 is a retaining wall comprising a plurality of parent piles inserted at a predetermined interval into the ground where the retaining wall is to be constructed, a plurality of cross sheet piles installed between adjacent parent piles, and a plurality of auxiliary piles inserted from the sides of the parent piles into the ground behind the parent piles and connected to the parent piles via connecting members, wherein the parent piles and the auxiliary piles are H-shaped steel beams integrally having a pair of flanges and a web connecting the pair of flanges, and have a pair of grooves with the web as the groove bottom and the pair of flanges as the groove side surfaces, the connecting members are used in pairs, upper and lower, for one auxiliary pile, the pair of upper and lower connecting members are fastened to the parent pile via a plurality of first bolts so as to be aligned in the vertical direction at a distance equal to the vertical width dimension of the auxiliary pile, and the opposing portions of the pair of upper and lower connecting members function as guides when the auxiliary piles are inserted into the ground behind the parent piles and are fastened to the flanges of the inserted auxiliary pile via a plurality of second bolts. Furthermore, the invention of claim 2 is a retaining wall described in claim 1, wherein the connecting member is formed in a box shape by a parent pile fastening plate portion fastened to the web of the parent pile, an auxiliary pile fastening plate portion fastened to the flange of the auxiliary pile, and a plurality of connecting plate portions that integrally connect the parent pile fastening plate portion and the auxiliary pile fastening plate portion. The invention of claim 3 is the earth-retaining wall according to claim 1 or 2, wherein the pair of upper and lower connecting members are integrally connected via end plates. Furthermore, the invention of claim 4 is a retaining wall according to any one of claims 1 to 3, wherein a reinforcing member is provided on the base end side of the auxiliary pile in the insertion direction, and is welded to the pair of flanges and the web. A fifth aspect of the present invention provides the earth-retaining wall according to the fourth aspect, wherein the reinforcing members include first reinforcing members that cover base end faces of the auxiliary piles in the insertion direction. Furthermore, the invention of claim 6 is a retaining wall as described in claim 4 or 5, wherein the reinforcing members include a plurality of second reinforcing members arranged within a pair of the groove portions and near the fastening position with the connecting member. The invention of claim 7 is as follows: Excluding the citation of claim 1In the retaining wall described in claim 6, when the auxiliary piles are connected to a pair of upper and lower connecting members, in a side view, the multiple second reinforcing members and the multiple connecting plate portions are arranged in a straight line in the vertical direction. Furthermore, the invention of claim 8 is a retaining wall described in any one of claims 1 to 7, wherein the second bolt is a long bolt that penetrates in the vertical direction through the opposing portions of a pair of upper and lower connecting members and the auxiliary pile inserted between the opposing portions. The invention of claim 9 is as follows: Excluding the citation of claim 1 9. The earth-retaining wall according to claim 2, wherein the connecting member further comprises a reinforcing plate portion that integrally connects the plurality of connecting plate portions together. [Effects of the Invention]

[0006] According to the invention of claim 1, a pair of connecting members, one above the other, is used for one auxiliary pile, and the pair of connecting members is fastened to the parent pile via a plurality of first bolts so as to be aligned vertically at a distance equal to the vertical width dimension of the auxiliary pile, and the opposing portions of the pair of connecting members function as guides when inserting the auxiliary pile into the rear-side ground, allowing the auxiliary pile to be inserted easily and accurately into the rear-side foundation. In addition, the opposing portions of the pair of connecting members are fastened to the flange of the inserted auxiliary pile via a plurality of second bolts, allowing the inserted auxiliary pile to be firmly connected to the parent pile via the pair of connecting members, resulting in reliable transmission of moment from the auxiliary pile to the parent pile. Furthermore, according to the invention of claim 2, the connecting member is formed in a box shape by a parent pile fastening plate portion fastened to the web of the parent pile, an auxiliary pile fastening plate portion fastened to the flange of the auxiliary pile, and a plurality of connecting plate portions that integrally connect the parent pile fastening plate portion and the auxiliary pile fastening plate portion. Therefore, compared to when the connecting member is made of H-shaped steel or the like, deformation of the connecting member itself is suppressed, and the transmission of moment from the auxiliary pile to the parent pile can be more reliably carried out. Furthermore, according to the invention of claim 3, the pair of upper and lower connecting members are integrally connected via end plates, so that the spacing between the pair of upper and lower connecting members can be more accurately controlled compared to when the pair of upper and lower connecting members are fastened individually to the parent piles. Furthermore, according to the invention of claim 4, a reinforcing member welded to a pair of flanges and a web is provided at the base end side of the auxiliary pile in the insertion direction, thereby suppressing deformation of the auxiliary pile and making it possible to more reliably transmit moment from the auxiliary pile to the parent pile. According to the invention of claim 5, the reinforcing member includes a first reinforcing member that covers the base end face of the auxiliary pile in the insertion direction, so that the auxiliary pile can be reinforced without interfering with the insertion of the auxiliary pile. Furthermore, according to the invention of claim 6, the reinforcing member includes a plurality of second reinforcing members arranged within a pair of grooves near the fastening position with the connecting member, so that the auxiliary piles can be reinforced without interfering with the insertion of the auxiliary piles. Furthermore, the invention of claim 7 is a retaining wall as described in claim 6, in which when the auxiliary piles are connected to a pair of upper and lower connecting members, in a side view, the multiple second reinforcing members and the multiple connecting plate portions are arranged in a straight line in the vertical direction, thereby making it possible to more reliably transmit moment from the auxiliary piles to the parent piles. Furthermore, according to the invention of claim 8, the second bolt is a long bolt that penetrates in the vertical direction through the opposing portions of a pair of upper and lower connecting members and the auxiliary pile inserted between said opposing portions, so not only can the auxiliary pile be fastened to the upper and lower connecting members simultaneously, but work such as previously placing (welding) nuts on the inner surface of the flange of the auxiliary pile is also unnecessary, thereby improving the workability of the retaining wall. Furthermore, according to the invention of claim 9, the connecting member further includes a reinforcing plate portion that integrally connects multiple connecting plate portions together, thereby further suppressing deformation of the connecting member itself and making it possible to more reliably transmit moment from the auxiliary pile to the parent pile. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing the structure of an earth retaining wall according to one embodiment of the present invention. [Figure 2] FIG. 10 is a perspective view showing the state in which the connecting member is attached to the parent pile. [Figure 3] FIG. 10 is a perspective view showing a state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 4] FIG. 10 is a perspective view showing a state in which the gripping member has been removed from the auxiliary pile. [Figure 5] FIG. 10 is a front view showing the state in which the auxiliary pile is connected to the parent pile via the connecting member. [Figure 6] FIG. 10 is a plan view showing the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 7] FIG. 10 is a side view showing the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 8] 5A is a cross-sectional view taken along line XX in FIG. 5, and FIG. 5B is a cross-sectional view taken along line XX showing a state in which the gripping member has been removed from the auxiliary pile. [Figure 9] FIG. [Figure 10] FIG. 10 is a perspective view showing a retaining wall according to a second embodiment of the present invention, with connecting members attached to the parent piles. [Figure 11] FIG. 10 is a perspective view showing a retaining wall according to a second embodiment of the present invention, illustrating the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 12] FIG. 10 is a perspective view showing a retaining wall according to a second embodiment of the present invention, with the gripping member removed from the auxiliary pile. [Figure 13] FIG. 10 is a diagram showing a retaining wall according to a second embodiment of the present invention, and is a front view showing the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 14] FIG. 10 is a diagram showing a retaining wall according to a second embodiment of the present invention, and is a plan view showing the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 15] FIG. 10 is a diagram showing a retaining wall according to a second embodiment of the present invention, and is a side view showing the state in which an auxiliary pile is connected to a parent pile via a connecting member. [Figure 16]13A and 13B are diagrams showing a retaining wall according to a second embodiment of the present invention, where (a) is a YY cross-sectional view of FIG. 13, and (b) is a YY cross-sectional view showing the state in which the gripping member has been removed from the auxiliary pile. [Figure 17] FIG. 10 is a diagram showing a retaining wall according to a second embodiment of the present invention, and is a perspective view of a connecting member. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Configuration of earth retaining wall] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 1, reference numeral 1 denotes an earth retaining wall, which comprises a plurality of parent piles 2 inserted at predetermined intervals into the ground where the earth retaining wall is to be constructed, a plurality of horizontal sheet piles 3 installed between adjacent parent piles 2, and a plurality of auxiliary piles 4 inserted from the sides of the parent piles 2 into the ground behind them and connected to the parent piles 2 via connecting members 5.

[0009] As shown in Figures 1 to 8, the parent pile 2 is typically inserted (driven) vertically into the ground where the earth-retaining wall is to be constructed. The components used are H-shaped steel beams, which are commonly used for parent pile and horizontal sheet pile earth-retaining walls. The parent pile 2, made of H-shaped steel, integrally comprises a pair of flanges 2a and a web 2b connecting the pair of flanges 2a. It also has a pair of grooves 2c, with the web 2b forming the groove bottom and the pair of flanges 2a forming the groove side surfaces. The webs 2b are drilled with a plurality of bolt holes (not shown) for connecting the connecting members 5 via first bolts B1. The bolt holes may be drilled before the parent pile 2 is inserted into the ground, or after the parent pile 2 is inserted into the ground, at the same time as fastening the connecting members 5 to the parent pile 2.

[0010] The cross-sectional dimensions of the H-shaped ropes that make up the parent piles 2 are selected according to the wall height, but piles of approximately H300 to H500 are commonly used. Furthermore, before excavating the ground where the retaining wall will be constructed, the parent piles 2 are inserted into the ground at specified intervals along the boundary line of the ground to be excavated. The insertion intervals are generally about 1.0 to 2.0 m.

[0011] The horizontal sheet piles 3 are plates that are fitted sequentially between adjacent piles 2 as excavation is carried out, to retain soil. The horizontal sheet piles 3 are usually made of wood such as Japanese larch.

[0012] The auxiliary piles 4 are installed in one or more vertical rows. Figure 1 shows an example where the auxiliary piles 4 are installed in two rows vertically. The auxiliary piles 4 are made of H-shaped steel with a cross section of approximately H200 to H400. The auxiliary piles 4 made of H-shaped steel integrally have a pair of flanges 4a and a web 4b connecting the pair of flanges 4a, and also have a pair of grooves 4c with the web 4b as the groove bottom and the pair of flanges 4a as the groove side. The number of rows and insertion depth of the auxiliary piles 4 are determined by design calculations based on the allowable deformation of the top end of the parent pile 2, but in typical cases, they are installed in about two to four rows vertically, and the insertion depth is about 2 to 5 m.

[0013] As excavation progresses, auxiliary piles 4 are installed for each parent pile 2 at each predetermined excavation stage. Although it is possible to install only one auxiliary pile per location, it is preferable to install a pair of auxiliary piles on both sides of the parent pile 2 per location, as shown in the figure, in order to ensure a large moment. The auxiliary piles are inserted from the side of the parent pile 2 in a roughly horizontal direction into the ground on the rear side, and the insertion point is connected to the parent pile 2 via a connecting member 5. The insertion direction of the auxiliary piles 4 is basically horizontal, but they may be installed at a slight incline to allow for construction errors.

[0014] 3 to 8, a plurality of reinforcing members 41 to 43 are welded to the pair of flanges 4a and the web 4b on the base end side in the insertion direction of the auxiliary pile 4. These reinforcing members 41 to 43 suppress deformation on the base end side in the insertion direction of the auxiliary pile 4 and ensure that moment is transmitted from the auxiliary pile 4 to the parent pile 2.

[0015] The reinforcing members 41 to 43 include a first reinforcing member 41 that covers the base end face in the insertion direction of the auxiliary pile 4. The first reinforcing member 41 is welded to the base end face in the insertion direction of the auxiliary pile 4 so as to close a pair of grooves 4c of the auxiliary pile 4. In addition, the first reinforcing member 41 is formed with bolt insertion holes 41a for connecting a gripping member 6, which will be described later.

[0016] The reinforcing members 41 to 43 also include a plurality of second reinforcing members 42, 43 that are provided in the pair of grooves 4c of the auxiliary pile 4 and in the vicinity of the fastening position with the connecting member 5.

[0017] When inserting the auxiliary piles 4 into the rear-side ground using an insertion heavy machine (not shown), a gripping area for the insertion heavy machine is required at the base end in the insertion direction of the auxiliary piles 4. As shown in Figures 3 to 8, the earth-retaining wall construction method of this embodiment uses a gripping area member 6 that is detachably attached to the base end in the insertion direction of the auxiliary piles 4, serves as a gripping area for the insertion heavy machine that inserts the auxiliary piles 4 when inserting the auxiliary piles 4 into the rear-side ground, and is detached from the auxiliary piles 4 after insertion.

[0018] The gripping 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 an H-shaped steel with the same cross section as the auxiliary pile 4 is used. A gripping-side joint member 61 is welded to the H-shaped steel constituting the gripping member 6 so as to cover the tip end face in the insertion direction. The gripping-side joint member 61 has a plurality of bolt insertion holes (not shown) drilled therein for fastening to the first reinforcing member 41 of the auxiliary pile 4 via a plurality of third bolts B3.

[0019] A pair of connecting members 5, one above the other, is used for one auxiliary pile 4. The pair of upper and lower connecting members 5 are fastened to the parent pile 2 via a plurality of first bolts B1 and first nuts N1 so that they are lined up in the vertical direction at a distance equal to the vertical width dimension of the auxiliary pile 4. The opposing portions of the pair of upper and lower connecting members 5 function as guides when inserting the auxiliary pile 4 into the rear-side ground. In addition, the opposing portions of the pair of upper and lower connecting members 5 are fastened to the flange 4a of the inserted auxiliary pile 4 via a plurality of second bolts B2 and second nuts N2.

[0020] Specifically, as shown in Figure 9, the connecting member 5 of this embodiment is formed in a box shape and includes a parent pile fastening plate portion 51 that is fastened to the web 2b of the parent pile 2, an auxiliary pile fastening plate portion 52 that is fastened to the flange 4a of the auxiliary pile 4, a plurality of connecting plate portions 53 that integrally connect the parent pile fastening plate portion 51 and the auxiliary pile fastening plate portion 52, and a first reinforcing plate portion 54 and a second reinforcing plate portion 55 that integrally connect the plurality of connecting plate portions 53 together.

[0021] The parent pile fastening plate portion 51 has a plurality of bolt insertion holes 51a formed therein through which the first bolt B1 can be inserted, and the auxiliary pile fastening plate portion 52 has a plurality of bolt insertion holes 52a formed therein through which the second bolt B2 can be inserted. The connecting member 5 also has an opening 56 that communicates with the inside of the box, and the bolts B1, B2 and nuts N1, N2N are fastened through this opening 56.

[0022] 9, a pair of upper and lower connecting members 5 are integrally connected via end plates 57 to form a connecting unit U, which is fastened to the parent pile 2 in the form of a connecting unit U. In other words, the pair of upper and lower connecting members 5 are not fastened to the parent pile 2 individually, but are fastened to the parent pile 2 integrally as a unit welded to the end plates 57 with the spacing accurately measured in advance.

[0023] [Construction method of earth retaining wall] Next, the construction procedure for the earth retaining wall 1 will be described with reference to FIGS.

[0024] First, using a construction machine such as a pile driver, the main piles 2 are inserted into the ground at predetermined intervals along the excavation boundary line.

[0025] Next, the area enclosed by the parent piles 2 is excavated using an excavator or other excavating machine. As the excavation progresses, cross sheet piles 3 are placed between the parent piles 2, and the ground is gradually dug down while retaining soil. Once the excavation has reached the specified depth, i.e., a position slightly deeper than the installation position of the first tier of auxiliary piles 4, work to install the first tier of auxiliary piles 4 begins.

[0026] Prior to inserting the auxiliary piles 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. This work is performed by arranging the pair of left and right connecting units U so that they sandwich the web 2b of the parent pile 2, and fastening the pair of left and right connecting units U to the web 2b of the parent pile 2 using a plurality of first bolts B1 and first nuts N1. In addition, a gripping member 6 is attached to the base end of the auxiliary pile 4 in the insertion direction using a plurality of third bolts B3 and third nuts N3.

[0027] The auxiliary pile 4 is inserted while gripping the web 6b of the gripping member 6 with an insertion machine. During insertion of the auxiliary pile 4, the auxiliary pile 4 is positioned between the pair of upper and lower connecting members 5, which function as insertion guides. Once insertion is complete, the pair of flanges 4a of the auxiliary pile 4 are fastened to the pair of upper and lower connecting members 5 with a plurality of second bolts B2 and second nuts N2. The gripping member 6 is then removed from the auxiliary pile 4.

[0028] Once the installation work for the first tier of auxiliary piles 4 is complete, excavation begins, and the ground is gradually dug down while the cross-sheet piles 3 are installed at the same time. Once the excavation is completed to a position slightly deeper than the installation position for the second tier of auxiliary piles 4, installation work for the second tier of auxiliary piles 4 begins. The installation procedure is the same as for the first tier. Once the installation work for the second tier of auxiliary piles 4 is complete, excavation is continued to the specified depth, and construction of the retaining wall 1 is completed.

[0029] [Effects of the embodiment] According to the present embodiment configured as described above, the earth-retaining wall 1 comprises a plurality of parent piles 2 inserted at predetermined intervals into the earth-retaining wall construction ground, a plurality of horizontal sheet piles 3 installed between adjacent parent piles 2, and a plurality of auxiliary piles 4 inserted from the sides of the parent piles 2 into the rear side ground and connected to the parent piles 2 via connecting members 5, and the parent piles 2 and auxiliary piles 4 are H-shaped steel integrally having a pair of flanges 2a, 4a and webs 2b, 4b connecting the pair of flanges 2a, 4a, and the webs 2b, 4b are disposed at the bottom of the trench. The auxiliary pile 4 has a pair of groove portions 2c, 4c with a pair of flanges 2a, 4a as the groove side surfaces, and a pair of connecting members 5, one upper and one lower, are used for one auxiliary pile 4, and the pair of upper and lower connecting members 5 are fastened to the parent pile 2 via a plurality of first bolts B1 so that they are lined up in the vertical direction at a distance equal to the vertical width dimension of the auxiliary pile 4, and the opposing portions of the pair of upper and lower connecting members 5 function as guides when inserting the auxiliary pile 4 into the rear side ground, so that the auxiliary pile 4 can be inserted into the rear side base easily and with high precision.

[0030] Furthermore, the opposing portions of the pair of upper and lower connecting members 5 are fastened to the flanges 4a of the inserted auxiliary pile 4 via a plurality of second bolts B2, so that the inserted auxiliary pile 4 can be firmly connected to the parent pile 2 via the pair of upper and lower connecting members 5, thereby making it possible to reliably transmit moment from the auxiliary pile 4 to the parent pile 2.

[0031] In addition, the connecting member 5 is formed into a box shape by a parent pile fastening plate portion 51 that is fastened to the web 2b of the parent pile 2, an auxiliary pile fastening plate portion 52 that is fastened to the flange 4a of the auxiliary pile 4, and a plurality of connecting plate portions 53 that integrally connect the parent pile fastening plate portion 51 and the auxiliary pile fastening plate portion 52. Therefore, compared to when the connecting member 5 is made of H-shaped steel or the like, deformation of the connecting member 5 itself is suppressed, and the transmission of moment from the auxiliary pile 4 to the parent pile 2 can be more reliably carried out.

[0032] Furthermore, since the pair of upper and lower connecting members 5 are connected together via the end plate 57, the spacing between the pair of upper and lower connecting members 5 can be more accurately controlled than when the pair of upper and lower connecting members 5 are fastened individually to the parent pile 2.

[0033] In addition, reinforcing members 41 to 43 are provided on the base end side of the auxiliary pile 4 in the insertion direction, which are welded to a pair of flanges 4a and web 4b, thereby suppressing deformation of the auxiliary pile 4 and making it possible to more reliably transmit moment from the auxiliary pile 4 to the parent pile 2.

[0034] Furthermore, since the reinforcing members 41 to 43 include the first reinforcing member 41 that covers the base end face of the auxiliary pile 4 in the insertion direction, the auxiliary pile 4 can be reinforced without interfering with the insertion of the auxiliary pile 4.

[0035] Furthermore, the reinforcing members 41 to 43 include a plurality of second reinforcing members 42, 43 that are provided in the pair of grooves 4c near the fastening positions with the connecting members 5, so that the auxiliary piles 4 can be reinforced without interfering with the insertion of the auxiliary piles 4. Furthermore, the connecting members 5 guide the insertion of the auxiliary piles 4 without being fitted into the grooves 4c of the auxiliary piles 4, so that the reinforcing members 42, 43 can be placed in the pair of grooves 4c and the auxiliary piles 4 can be reinforced without considering interference with the connecting members 5.

[0036] [Second embodiment] Next, an earth retaining wall 1 according to a second embodiment of the present invention will be described with reference to Figures 10 to 17. However, for configurations common to the first embodiment described above, the same reference numerals as in the first embodiment will be used, and the description of the first embodiment may be used.

[0037] 11 to 17, the retaining wall 1 of the second embodiment differs from that of the first embodiment in the configuration of the second bolts B2 that connect the upper and lower connecting members 5 and the auxiliary piles 4, the configuration of the multiple second reinforcing members 42 to 44 provided on the auxiliary piles 4, and the configuration of the reinforcing plate portion 58 provided on the connecting members 5. These differences will be explained below in order.

[0038] The second bolts B2 in the second embodiment are long bolts that vertically penetrate the opposing portions (auxiliary pile fastening plate portions 52) of the pair of upper and lower connecting members 5 and the auxiliary piles 4 (upper and lower flanges 4a) inserted between the opposing portions. In the first embodiment, eight second bolts B2 were required to fasten the auxiliary piles 4 to the pair of upper and lower connecting members 5. However, in the second embodiment, not only can the number of second bolts B2 be reduced to four, but the auxiliary piles 4 can be fastened to the upper and lower connecting members 5 simultaneously. Furthermore, work such as previously placing (welding) nuts on the inner flange surfaces of the auxiliary piles 4, which form a closed space during the connecting work, is also unnecessary, thereby significantly improving the workability of the earth-retaining wall 1. Note that in the first embodiment, all the second bolts B2 are short bolts, and in the second embodiment, all the second bolts B2 are long bolts. However, short bolts and long bolts may be mixed as second bolts.

[0039] Furthermore, in the second embodiment, when the auxiliary pile 4 is connected to the pair of upper and lower connecting members 5, the multiple second reinforcing members 42 to 44 of the auxiliary pile 4 and the multiple connecting plate portions 53 of the pair of upper and lower connecting members 5 are arranged linearly in the vertical direction in a side view. Specifically, three second reinforcing members 42 to 44 are provided on the auxiliary pile 4 so as to sandwich the through space of the second bolt B2 in the front-rear direction. When the auxiliary pile 4 is connected to the pair of upper and lower connecting members 5, the three connecting plate portions 53 of the pair of upper and lower connecting members 5 are arranged linearly in the vertical direction in a side view. This not only firmly reinforces the connection portion of the auxiliary pile 4 with the connecting member 5, but also more reliably transmits moment from the auxiliary pile 4 to the parent pile 2. The number of second reinforcing members 42 to 44 may be two or four or more.

[0040] Furthermore, the connecting member 5 of the first and second embodiments includes reinforcing plates 54, 55, and 58 that integrally connect the multiple connecting plate portions 53 together. However, while the connecting member 5 of the first embodiment includes a first reinforcing plate 54 that connects the upper ends of the connecting plate portions 53 together and a second reinforcing plate 55 that connects the lower ends of the connecting plate portions 53 together, the connecting member 5 of the second embodiment includes a single reinforcing plate 58 (e.g., an angle bar with an L-shaped cross section) that connects the vertically intermediate portions of the outer connecting plate portions 53 together. The connecting members 5 of the first and second embodiments as described above further suppress deformation of the connecting member 5 itself and more reliably transmit moments from the auxiliary piles 4 to the parent piles 2. Furthermore, in the connecting member 5 of the second embodiment, reinforcing efficiency is improved by connecting the vertically intermediate portions of the outer connecting plate portions 53 together with the reinforcing plate 58, so that a sufficient reinforcing effect can be obtained even with a single reinforcing plate 58.

[0041] The present invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the claims. For example, the earth-retaining wall 1 can be used as a temporary structure, or as a permanent structure. The earth-retaining wall 1 as a permanent structure can be used as a retaining wall for a trench road at an overhead intersection, an embankment retaining wall in developed ground, a retaining wall for a flank embankment, or a leaning retaining wall (see, for example, JP 2017-197950 A). Furthermore, when the earth-retaining wall 1 is used in deep excavation, ground anchors may be used in addition to the auxiliary piles 4. [Explanation of symbols]

[0042] 1 Earth retaining wall 2 Main stake 2a flange 2b Web 2c Groove 3. Yokoyaita 4 Auxiliary piles 4a flange 4b Web 4c Groove 41 First reinforcing member 41a Bolt insertion hole 42-44 Second reinforcing member 5 Connecting members 51 Parent pile fastening plate 52 Auxiliary pile fastening plate part 53 Connecting plate part 54 First reinforcing plate part 55 Second reinforcing plate 56 Opening 57 End Plate 58 Reinforcement plate 6 Grip support member 6a flange 6b Web 61 Grip side joint member U-connected unit B1 First bolt B2 2nd Holt B3 3rd bolt

Claims

1. a plurality of parent piles inserted at predetermined intervals into the earth retaining wall construction ground; A plurality of horizontal sheet piles installed between adjacent parent piles; A retaining wall comprising: a plurality of auxiliary piles inserted into the backside ground from the side positions of the parent piles and connected to the parent piles via connecting members; The parent pile and the auxiliary pile are H-shaped steel beams integrally having a pair of flanges and a web connecting the pair of flanges, and have a pair of grooves with the web as the groove bottom surface and the pair of flanges as the groove side surfaces, The connecting members are used in pairs, one above the other, for one auxiliary pile, The pair of upper and lower connecting members are fastened to the parent pile via a plurality of first bolts so as to be aligned in the vertical direction at intervals equivalent to the vertical width dimensions of the auxiliary piles, The opposing portions of the pair of upper and lower connecting members function as guides when inserting the auxiliary piles into the rear ground, and form a retaining wall that is fastened to the flanges of the inserted auxiliary piles via a plurality of second bolts.

2. The retaining wall described in claim 1, wherein the connecting member is formed in a box shape by a parent pile fastening plate portion fastened to the web of the parent pile, an auxiliary pile fastening plate portion fastened to the flange of the auxiliary pile, and a plurality of connecting plate portions that integrally connect the parent pile fastening plate portion and the auxiliary pile fastening plate portion.

3. The retaining wall according to claim 1 or 2, wherein the pair of upper and lower connecting members are integrally connected via end plates.

4. The retaining wall according to any one of claims 1 to 3, wherein a reinforcing member welded to a pair of the flanges and the web is provided on the base end side of the auxiliary pile in the insertion direction.

5. The retaining wall according to claim 4 , wherein the reinforcing member includes a first reinforcing member covering a base end face of the auxiliary pile in the insertion direction.

6. The retaining wall according to claim 4 or 5, wherein the reinforcing members include a plurality of second reinforcing members provided within the pair of grooves near fastening positions with the connecting members.

7. A retaining wall as described in claim 6, excluding any reference to claim 1, in which, when the auxiliary piles are connected to a pair of upper and lower connecting members, in a side view, the multiple second reinforcing members and the multiple connecting plate portions are arranged in a straight line in the vertical direction.

8. A retaining wall as described in any one of claims 1 to 7, wherein the second bolt is a long bolt that penetrates the opposing opposing portions of a pair of upper and lower connecting members and the auxiliary pile inserted between the opposing portions in the vertical direction.

9. A retaining wall described in any one of claims 2 to 8, excluding any reference to claim 1, wherein the connecting member further comprises a reinforcing plate portion that integrally connects multiple connecting plate portions together.

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