JP6664699B2 - Mountain retaining method and support system - Google Patents

Description

  The present invention relates to a mountain retaining method and a shoring system.

  Conventionally, when constructing an underground structure such as a tunnel underground, a support such as a cutting beam is installed on a retaining wall in the underground space until the underground structure is constructed. , The inner circumference of the underground space was pinned.

  For example, after installing a plurality of shoring between opposing mountain retaining walls in the underground space, construct a bottom, move a movable formwork on the bottom, and raise the standing wall and top of the underground structure. A construction method has been proposed (see Patent Document 1 below).

JP-A-2000-145370

By the way, in the above-mentioned Patent Literature 1, since the shoring is installed over the entire underground space before the underground structure is constructed, there is a problem that a large number of temporary members such as the shoring are required. In addition, when the mountain retaining walls facing each other are not arranged at regular intervals over the underground space, there is a problem that adjustment is required when supporting the mountain retaining walls by the shoring work, which is troublesome.
Also, if the shoring is to be rationally installed in accordance with the excavation conditions, only the necessary parts need to be relocated from the viewpoint of effective use of materials.However, it is necessary to remove the shoring and assemble it at another location. Requires a great deal of labor as well as the installation of suspension equipment, and the construction period becomes longer.

  Therefore, the present invention has been made in view of the above circumstances, and provides a mountain retaining method and a shoring system capable of shortening the construction period while suppressing the number of temporary members used for shoring and the like.

In order to achieve the above object, the present invention employs the following means.
That is, the mountain retaining method according to the present invention is a pile installation step of installing a plurality of piles between the mountain retaining walls facing each other along the excavation direction in a predetermined area of the excavation space, and the excavation direction of the pile. In the first space on one side in the orthogonal direction, a first roller installation step of installing a first roller that guides in the excavation direction, and a first support is guided by the first roller forward in the excavation direction. A first supporter installation step of installing the first supporter, and a second roller for guiding the excavation direction in the second space on the other side of the pile in a direction orthogonal to the excavation direction. A roller setting step, a second shoring setting step of guiding the second shoring to the front in the excavation direction by the second roller, and setting the second shoring, the first shoring and the second shoring. The opposite ends of the shoring A mountain retaining wall that is connected by an extendable jack whose ends can extend and contract in opposite directions, and that supports the adjacent mountain retaining wall at the other end of the first support and the other end of the second support, respectively. A supporting step and a concrete placing step of placing concrete on the ground in the predetermined area, and a concrete area from the pile setting step to a front area in the excavation direction ahead of the predetermined area. The casting step is repeated, and in the first shoring installation step, the first shoring removed after shrinking the telescopic jack in the predetermined area is used, and in the second shoring installation step, the predetermined The second support used in the area is used.

In the mountain retaining method configured as described above, the first and second supports for supporting the retaining wall are commonly used in a predetermined area of the excavation space and a front area in the excavation direction ahead of the predetermined area. For this reason, the number of temporary members used can be reduced, and the construction cost can be reduced as compared with the case where shoring is installed in all parts.
Further, when the first and second supports are moved from the predetermined area to the front area, the first and second supports may be guided by the first and second rollers, respectively. Therefore, in comparison with a case where the shoring is removed from another part and reassembled again in the part, the first shoring and the second shoring thus removed can be installed and used as they are in the present invention. , Construction period can be shortened.

  In the mountain retaining method according to the present invention, it is preferable that the telescopic jack is arranged on a line connecting the adjacent piles.

  In the mountain retaining method constructed in this way, since the telescopic jacks are arranged on the line connecting the adjacent piles, the first and second supports are removed, and the first and second supports are removed. When moving the shoring forward in the direction of excavation, the stake does not interfere.

  Further, in the mountain retaining method according to the present invention, in the first roller setting step, the first roller is provided along one side in a direction orthogonal to the excavation direction of the pile and along the mountain retaining wall side in the first space. In the second roller installation step, the second roller may be installed along the other side of the pile orthogonal to the excavation direction and along the retaining wall side of the second space, respectively. .

  In the mountain retaining method configured in this way, in the first support, the end on the pile side and the edge on the adjacent mountain retaining wall are each supported by the first roller. In the second support, the pile-side end and the adjacent mountain retaining wall-side end are each supported by the second roller. Therefore, when the first support and the second support are guided by the first roller and the second roller, respectively, the guide can be stably guided.

  Further, the shoring system according to the present invention includes a pile installed between the mountain retaining walls facing each other along the excavation direction of the excavation space, and a first pile on one side in a direction orthogonal to the excavation direction of the pile. A first roller installed in a space and guiding in the excavation direction, a first supporter configured to be guided in the excavation direction by the first roller, and supporting a retaining wall on the first space side, and the pile A second roller installed in the second space on the other side in a direction orthogonal to the excavation direction, and configured to be guided in the excavation direction by the second roller, and the second space side A second shoring supporting the mountain retaining wall, and a telescopic jack configured to connect opposing ends of the first shoring and the second shoring and to be capable of expanding and contracting in the direction in which the ends oppose each other. Characterized by having To.

  The shoring system configured in this manner is configured such that the first shoring can be guided by a first roller installed along the excavation direction, and the second shoring is a second roller installed along the excavation direction. It is configured to be able to be guided. Therefore, when the support of the retaining wall in the predetermined area is completed, the first support and the second support may be guided by the first roller and the second roller, respectively, to the front area ahead of the predetermined area. Therefore, in comparison with a case where the shoring is removed from another part and reassembled again in the part, the first shoring and the second shoring thus removed can be installed and used as they are in the present invention. , Construction period can be shortened. In addition, since the first support and the second support are used in common in the predetermined area and the front area, the number of temporary members used can be reduced, and the construction cost is lower than in the case where the support is installed in all parts. Can be suppressed.

  ADVANTAGE OF THE INVENTION According to the shoring method and the shoring system according to the present invention, the number of temporary members used for shoring and the like can be suppressed, and shoring can be performed with good workability.

It is a top view showing the schematic structure of the shoring system concerning one embodiment of the present invention. It is the perspective view which looked at the shoring system concerning one embodiment of the present invention from the upper part. It is a vertical sectional view which cut the circumference of the connection part of the first shoring and the second shoring of the shoring system concerning one embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the vicinity of a connection portion between a first supporter and a second supporter and a retaining wall of a supporter system according to an embodiment of the present invention. It is a schematic plan view for explaining the mountain retaining method concerning one embodiment of the present invention. FIG. 6 is a schematic plan view for explaining a mountain retaining method according to an embodiment of the present invention, and shows a post-process of FIG. 5. FIG. 7 is a schematic plan view for explaining a mountain retaining method according to an embodiment of the present invention, and shows a post-process of FIG. 6. FIG. 8 is a schematic plan view for explaining a mountain retaining method according to an embodiment of the present invention, and shows a post-process of FIG. 7. FIG. 9 is a schematic plan view for explaining a mountain retaining method according to an embodiment of the present invention, and shows a post-step of FIG. 8.

  DETAILED DESCRIPTION OF THE INVENTION A mountain retaining method and a support system according to an embodiment of the present invention will be described with reference to the drawings. The shoring system supports, for example, a mountain retaining wall of an underground space (excavation space) such as a station building, a road, or a railway provided under the ground.

First, the configuration of the shoring system will be described.
FIG. 1 is a plan view showing a schematic configuration of a shoring system according to an embodiment of the present invention. FIG. 2 is a perspective view of the support system according to the embodiment of the present invention as viewed from above. In FIG. 1, illustration of a front and a rear of the support system in the excavation direction is omitted. In FIG. 2, the configuration of the upper part of the support system and the retaining wall are omitted.
As shown in FIG. 1 and FIG. 2, the shoring system 100 is installed between opposed mountain retaining walls W1 and W2 of an underground space K excavated by an excavator or the like. The excavation direction in which the excavation proceeds is the X direction shown in FIG.

  The shoring system 100 includes a pile 1, a first roller 2A, a second roller 2B, a first shoring unit (first shoring) 3A, a second shoring unit (second shoring) 3B, A telescopic jack 4.

The plurality of piles 1 are arranged substantially in the center of opposing mountain retaining walls W1 and W2 along the excavation direction. Each of the piles 1 has a lower end supported by the ground (ground) G of the excavation space and an upper end formed by a lining girder (not shown) on a top (not shown; the same applies hereinafter) facing the ground G of the underground space K. The same shall apply hereinafter). Note that the top is not necessarily restricted by a lining girder or the like. In the present embodiment, the pile 1 is made of a steel material such as an H-beam.
In addition, one side (mounting wall W1 side) across the pile 1 is referred to as a first space S1, and the other side (mounting wall W2 side) across the pile 1 is referred to as a second space S2.

FIG. 3 is a vertical cross-sectional view of the vicinity of a connection portion between the first support unit 3A and the second support unit 3B. FIG. 4 is a vertical cross-sectional view of the vicinity of a connection portion between the first support unit 3A and the second support unit 3B and the retaining walls W1 and W2.
As shown in FIGS. 1 to 4, brackets 10 are provided on the first space S1 side and the second space S2 side of the pile 1 respectively. In the present embodiment, brackets 10 are fixed to flanges 1F on both sides of the pile 1 (see FIG. 2; the same applies hereinafter). A bracket 10 is also provided on the inner peripheral surface WS (see FIG. 1; the same applies hereinafter) of each of the retaining walls W1 and W2.

  As shown in FIGS. 3 and 4, each bracket 10 includes a fixed plate 11 arranged along a vertical plane and a support plate 12 extending from an upper end of the fixed plate 11 at right angles to the fixed plate 11. And a diagonal member 13 for connecting the fixed plate 11 and the support plate 12 obliquely.

  As shown in FIG. 3, in the bracket 10 provided on the pile 1, the fixing plate portion 11 is fixed to the flange 1F. In the bracket 10 provided on the mountain retaining walls W1, W2, the fixing plate portion 11 is fixed to the inner peripheral surface WS of the mountain retaining walls W1, W2.

  As shown in FIGS. 3 and 4, the first roller 2 </ b> A is installed on the support plate 12 of the bracket 10 on the first space S <b> 1 side. The first roller 2A is configured to be rotatable with a horizontal direction orthogonal to the excavation direction as an axial direction. That is, the first roller 2A can guide a first support unit 3A described later in the excavation direction.

  In addition, second rollers 2B are installed on the support plate portion 12 of the bracket 10 on the second space S2 side. The second roller 2B is configured to be rotatable with a horizontal direction orthogonal to the excavation direction as an axial direction. That is, the second roller 2B can guide a second support unit 3B described later in the excavation direction.

  The first support unit 3A is arranged in the first space S1. As shown in FIG. 2, the first support unit 3 </ b> A has a guide beam 31, a cutting beam 32, a belly 33, and a fire beam 34.

  The guide beam 31 extends in the excavation direction. The guide beam 31 is supported by each of the first rollers 2A, and can be guided in the excavation direction. In the present embodiment, the guide beam 31 is made of a steel material such as an H-beam.

  The cutting beam 32 extends in a direction orthogonal to the excavation direction. In the present embodiment, the first support unit 3A is provided with six cut beams 32 (a part of them is shown in FIG. 1), but the number can be appropriately set. In the present embodiment, the cutting beam 32 is configured by connecting steel members 36 such as H-section steel by a connecting plate 37.

  The end 32A of the cutting beam 32 on the pile 1 side is fixed to the guide beam 31 supported by the first roller 2A on the bracket 10 fixed to the pile 1.

  The belly 33 extends in the direction of excavation. The belly 33 connects the ends 32Z of the cut beams 32 on the mountain retaining wall W1 side.

The belly 33 is fixed to the guide beam 31 supported by the first roller 2A on the bracket 10 fixed to the mountain retaining wall W1 (see FIG. 1; the same applies hereinafter). As shown in FIG. 4, a space between the protruding portion 33 and the retaining wall W1 is filled with a mortar M. In the present embodiment, the belly 33 is made of a steel material.
The mortar M may not be filled, and each belly 33 may be in contact with the inner peripheral surface WS of the retaining wall W1, W2. Alternatively, a configuration may be adopted in which a sandbag (not shown; the same applies hereinafter) is installed between the stomach 33 and the inner peripheral surfaces WS of the mountain retaining walls W1 and W2.

  As shown in FIG. 2, the blow beam 34 diagonally connects the cutting beam 32 and the belly 33 to prevent deformation of the connecting portion between the cutting beam 32 and the belly 33. In the present embodiment, the blow beam 34 is configured by connecting a plurality of steel materials.

  Adjacent cutting beams 32 may be connected by a connecting member (not shown) extending in the excavation direction.

  The second support unit 3B is arranged in the second space S2. In the second support unit 3B, the guide beam 31 is supported by the second roller 2B, and the end 32A of the cutting beam 32 on the side of the pile 1 is supported by the second roller 2B on the bracket 10 fixed to the pile 1. The first support unit 3A and the first support unit 3A are supported except that the bulge 33 is fixed to the guide beam 31 supported by the second roller 2B on the bracket 10 fixed to the retaining wall W2. Since the configuration is the same, the description is omitted.

  The telescopic jack 4 connects the end 32A of the cut beam 32 of the first support unit 3A on the pile 1 side and the end 32A of the cut beam 32 of the second support unit 3B on the pile 1 side. The telescopic jack 4 is extendable and contractible in a horizontal direction orthogonal to the excavation direction. The telescopic jack 4 is arranged on a line connecting adjacent piles 1. In this embodiment, a hydraulic jack is used as the telescopic jack 4.

  Next, a mountain retaining method using the above-described support system 100 will be described mainly with reference to FIGS.

(Pile setting process in the first block B1 and the second block B2)
FIG. 5 is a schematic plan view for explaining the mountain retaining method. 5 to 9, the first support unit 3A and the second support unit 3B are illustrated as being composed of two cutting beams 32 for convenience.
In the present embodiment, the underground space K is divided into blocks in the excavation direction in units of, for example, about 20 to 30 m, and the work is performed for each block. As shown in FIG. 5, the work proceeds in the order of the first block B1 (predetermined area), the second block B2 (front area), and the third block B3.
In the first block B1 and the second block B2, a plurality of piles 1 are installed along the excavation direction substantially at the center of the mountain retaining walls W1 and W2 facing each other. The lower end of each pile 1 is supported on the ground G (see FIG. 2; the same applies hereinafter), and the upper end is restrained by a lining girder or the like.

(First roller installation step in first space S1 of first block B1 and first space S1 of second block B2)
Next, in the first space S1 of the first block B1 and the first space S1 of the second block B2, the flange 1F (see FIG. 2; the same applies hereinafter) on the first space S1 side of the pile 1 and the retaining wall W1. The fixing plate 11 (see FIG. 2; the same applies hereinafter) of the bracket 10 is fixed to the peripheral surface WS. Then, the first roller 2A is installed on the support plate portion 12 of each bracket 10 (see FIG. 2; the same applies hereinafter). At this time, the bracket 10 may be installed in advance on the second space side of the pile 1 and also on the inner peripheral surface of the retaining wall W2.

(First support installation process in the first space S1 of the first block B1)
The guide beam 31 of the first support unit 3A assembled in advance is guided forward by the first roller 2A in the excavation direction. In the present embodiment, a towing pulley 38 is installed at the front end 31A of the guide beam 31 of the first support unit 3A in the excavation direction. The wire rope 39 wound around the pulley 38 is towed. When the wire rope 39 has a large slack during towing, the towing can be performed smoothly by supporting the wire rope 39 on the first roller 2A of the second block B2. Then, the first support unit 3A is installed at a position where the cutting beam 32 is arranged between the piles 1.
The support of the wire rope 39 is not limited to the first roller 2A, but may be another member. For example, the bracket 10 may be supported, or a plurality of brackets 10 may be connected to each other by a diagonal member (not shown; the same applies hereinafter) or the like, and may be supported by the diagonal member.

(Second roller setting step in second space S2 of first block B1 and second space S2 of second block B2)
FIG. 6 is a schematic plan view for explaining the mountain retaining method, and shows a post-process of FIG. 5.
As shown in FIG. 6, in the second space S2 of the first block B1 and the second space S2 of the second block B2, the flange 1F of the pile 1 on the second space S2 side and the inner peripheral surface WS of the retaining wall W2 have: The fixing plate 11 of the bracket 10 is fixed. Then, the second roller 2 </ b> B is installed on the support plate 12 of each bracket 10.

(Second Shoring Installation Step in Second Space S2 of First Block B1)
The guide beam 31 of the second support unit 3B assembled in advance is guided by the second roller 2B forward in the excavation direction. In the present embodiment, a tow pulley 38 is installed at the front end 31A of the guide beam 31 of the second support unit 3B in the excavation direction. The wire rope 39 wound around the pulley 38 is towed. If the wire rope 39 has a large slack during towing, the towing can be performed smoothly by supporting the wire rope 39 on the second roller 2B of the second block B2. Then, the second support unit 3B is installed at a position where the cut beam 32 of the second support unit 3B faces the cut beam 32 of the first support unit 3A.
In addition, similarly to the case of the first space S1, the support of the wire rope 39 is not limited to the second roller 2B and may be another member. For example, the bracket 10 may be supported, or a plurality of brackets 10 may be connected to each other by a diagonal member (not shown; the same applies hereinafter) or the like, and may be supported by the diagonal member.

(Step of supporting the retaining wall in the first block B1)
FIG. 7 is a schematic plan view for explaining the mountain retaining method, and shows a post-process of FIG. 6.
As shown in FIG. 7, the mortar M (see FIG. 4; the same applies hereinafter) between the protruding portions 33 of the first support unit 3A and the protruding portions 33 of the second support unit 3B and the retaining walls W1, W2. .) May be filled. Further, the end 32A of the cut beam 32 of the first support unit 3A on the pile 1 side and the end 32A of the second support unit 3B on the pile 1 side are connected by the telescopic jack 4. The telescopic jack 4 is adjusted such that the first support unit 3A and the second support unit 3B respectively support the retaining walls W1 and W2 with a desired force.
If the stroke of the telescopic jack 4 is sufficient, the bulges 33 may be brought into contact with the inner peripheral surfaces WS of the retaining walls W1 and W2 without filling the mortar M. Alternatively, a sandbag (not shown; the same applies hereinafter) may be provided between the stomach 33 and the inner peripheral surfaces WS of the retaining walls W1, W2.

(Concrete casting process in the first block B1)
The leveling concrete 5 is poured into the ground G of the first block B1 and cured.

(Pile installation process in the third block B3)
FIG. 8 is a schematic plan view for explaining the mountain retaining method, and shows a post-process of FIG. 7.
As shown in FIG. 8, in the third block B3, a plurality of piles 1 are installed along the excavation direction substantially at the center of the mountain retaining walls W1 and W2 facing each other.
Note that the pile 1 may be installed in advance. For example, when installing the piles 1 of the first block B1 and the second block B2, the piles 1 of the third block B3 may also be installed.

(Step of setting first roller in first space S1 of third block B3)
Next, the bracket 10 and the first roller 2A are installed in the first space S1 of the third block B3, as in the case of the second block B2.

(First support installation process in the first space S1 of the second block B2)
Next, the telescopic jack 4 (see FIG. 7; the same applies hereinafter) connecting the first support unit 3A and the second support unit 3B is contracted, and the connection is removed. Then, the wire rope 39 connected to the guide beam 31 of the first shoring unit 3A is pulled, and the first shoring unit 3A is installed at a position where the cutting beam 32 is disposed between the piles 1. In this way, the first support unit 3A used in the first block B1 is moved to and installed in the second block B2.

(Step of setting second roller in second space S2 of third block B3)
FIG. 9 is a schematic plan view for explaining the mountain retaining method, and shows a post-process of FIG. 8.
As shown in FIG. 9, the bracket 10 and the second roller 2B are installed in the second space S2 of the third block B3, as in the case of the second block B2.

(Second Shoring Installation Step in Second Space S2 of Second Block B2)
Next, the wire rope 39 connected to the guide beam 31 of the second support unit 3B is pulled, so that the cut beam 32 of the second support unit 3B faces the cut beam 32 of the first support unit 3A. Then, the second support unit 3B is installed. In this way, the second support unit 3B used in the first block B1 is moved to and installed in the second block B2.

(Mounting wall support process in second block B2)
Next, similarly to the case of the second block B1, the mortar M is placed between the protruding portion 33 of the first support unit 3A and the protruding portion 33 of the second support unit 3B and the retaining walls W1, W2. It may be filled. Further, the end 32A of the cut beam 32 of the first support unit 3A on the pile 1 side and the end 32A of the second support unit 3B on the pile 1 side are adjusted and connected by the telescopic jack 4.
As in the case of the first block B1, if the stroke of the telescopic jack 4 is sufficient, each bulge 33 abuts against the inner peripheral surface WS of the retaining wall W1, W2 without filling the mortar M. May be. Alternatively, a sandbag (not shown; the same applies hereinafter) may be provided between the stomach 33 and the inner peripheral surfaces WS of the retaining walls W1, W2.

(Concrete casting process in the second block B2)
The leveling concrete 5 is poured into the ground G of the first block B1 and cured.
In this way, the work proceeds sequentially toward the front in the excavation direction.

  In the mountain retaining method and the supporting system 100 configured as described above, the first and second supporting units 3A and 2A that support the retaining walls W1 and W2 in the first block B1 and the second block B2 of the underground space K. Since 3B is used in common, the number of temporary members used can be reduced, and the construction cost can be reduced as compared with the case where shoring is installed in all parts.

  When the first support unit 3A and the second support unit 3B are moved from the first block B1 to the second block B2, they may be guided by the first roller 2A and the second roller 2B, respectively. Accordingly, in the present invention, the first support unit 3A and the second support unit 3B that are removed behind in the excavation direction X are compared with the case where the support is removed from another part and reassembled again at the relevant part. Since it can be used and installed in front of the excavation direction X as it is, the construction period can be shortened, and there is no more labor than when assembling again.

  In addition, since the telescopic jack 4 is disposed on a line connecting the adjacent piles 1, the first support unit 3A and the second support unit 3B are removed, and the first support unit 3A and the first support unit 3A are removed. When moving the two support units 3B forward in the excavation direction, the pile 1 does not interfere.

  Further, in the first support unit 3A, the end on the pile 1 side and the end on the retaining wall W1 side are supported by the first roller 2A via the guide beam 31, respectively. Further, in the second support unit 3B, the end on the side of the pile 1 and the end on the side of the retaining wall W2 are supported by the second roller 2B via the guide beam 31, respectively. Therefore, when the first support unit 3A and the second support unit 3B are guided by the first roller 2A and the second roller 2B, respectively, they can be guided stably.

  The various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

  For example, in the embodiment shown above, in order to guide the wire rope 39 to the first roller 2A, the pile installation step and the first roller installation step in the second block B2 are performed in the first space S1 of the first block B1. Although it was performed prior to the one support installation process, the present invention is not limited to this. For example, if the first support unit 3A can be pressed from the back in the excavation direction, the pile setting step and the first roller setting step in the second block B2 may be performed after the concrete setting step in the first block B1. . The same applies to the case in the second space S2.

100 ... Shoring system 1 ... Pile 1F ... Flange 2A ... First roller 2B ... Second roller 3A ... First supporting unit (first supporting)
3B… Second Shoring Unit (Second Shoring)
4 Telescopic jack 5 Concrete 10 Bracket 31 Guide beam 32 Cutting beam 33 Uplifting 34 Blowing beam B1 First block (predetermined area)
B2: Second block (front area)
B3: Third block K: Underground space (digging space)
S1: first space S2: second space W1, W2: retaining wall

Claims (4)

In a predetermined area of the excavation space, a pile installation step of installing a plurality of piles between the mountain retaining walls facing each other along the excavation direction,
A first roller installation step of installing a first roller that guides in the excavation direction, in a first space on one side in a direction orthogonal to the excavation direction of the pile,
A first shoring installation step of setting the first shoring by guiding the first shoring to the front in the excavation direction by the first roller,
In the second space on the other side in the direction orthogonal to the excavation direction of the pile, a second roller installation step of installing a second roller for guiding in the excavation direction,
A second support installation step of setting the second support by guiding the second support in the excavation direction forward by the second roller,
The opposite ends of the first shoring and the second shoring are connected to each other by a telescopic jack capable of expanding and contracting in the direction in which the ends face each other, and the other end of the first shoring and the second A retaining wall supporting step of supporting the retaining wall adjacent to each other at the other end of the shoring,
Concrete casting step of casting concrete on the ground in the predetermined area,
For a front area in the excavation direction ahead of the predetermined area,
Repeat the concrete placement process from the pile installation process,
In the first shoring installation step, using the first shoring removed after shrinking the telescopic jack of the predetermined area,
In the second support installation step, the second support used in the predetermined area is used.   The method of claim 1, wherein the telescopic jack is arranged on a line connecting the adjacent piles. In the first roller installation step, the first roller is installed along one side of the pile orthogonal to the excavation direction and along the retaining wall side of the first space side,
The said 2nd roller installation process WHEREIN: The said 2nd roller is installed along the other side of the direction orthogonal to the said digging direction of the said pile, and the said retaining wall side of the said 2nd space side, respectively. The mountain retaining method according to 1 or 2. Piles installed between the retaining walls facing each other along the excavation direction of the excavation space,
A first roller that is installed in a first space on one side in a direction orthogonal to the excavation direction of the pile and guides the pile in the excavation direction,
A first supporter configured to be able to be guided in the excavation direction by the first roller and supporting a retaining wall on the first space side,
A second roller installed in the second space on the other side in a direction orthogonal to the excavation direction of the pile, and guiding the pile in the excavation direction,
A second supporter configured to be able to be guided in the excavation direction by the second roller and supporting a retaining wall on the second space side,
A supporting system comprising: a telescopic jack configured to connect opposing ends of the first shoring and the second shoring and to be configured to be extensible in a direction in which the ends oppose each other.

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