JP6854111B2 - Mountain retaining structure - Google Patents

Description

The present invention relates to a retaining structure.

Patent Document 1 includes a plurality of parent piles built in the ground at predetermined intervals and a plurality of horizontal sheet piles sequentially erected between the parent piles. The technology related to the retaining wall is disclosed.

In this prior art, a plurality of tightening bolts are attached to the other flange of the main pile. Then, the end portion of the horizontal sheet pile is pressed by the tightening bolt so that the elastic water stop member is in close contact with the end portion of the horizontal sheet pile and one flange.

Here, as shown in FIG. 13 (A), when excavating the ground 10 by the retaining wall open cut method, the ground on the side where the H-shaped steel 20 or the like supporting the horizontal sheet pile 50 that hits the excavated wall surface 12 is excavated in advance. Need to be embedded in 10.

However, as shown in FIG. 13B, in reality, as unavoidable external factors, the relationship between the size of the excavating machine and the building such as the adjacent land, and the ground conditions (underground obstacles, gravel, etc.) Considering the type, etc.), the H-shaped steel 20 must be installed inward (excavation side) of the excavation wall surface 12 from the boundary line. Moreover, in the actual construction, the installation accuracy of the H-shaped steel 20 varies due to the various external factors described above, so that the positions of the horizontal sheet piles 50 are not uniform. As a result, it is necessary to fill the backfill soil 520 between the excavated wall surface 12 and the horizontal sheet pile 50.

Patent No. 3782180

In consideration of the above facts, an object of the present invention is to provide a retaining structure capable of hitting a plate material against an excavated wall surface without filling with backfill soil.

The first aspect is a pile built in the ground at intervals, a plate material that hits the excavated wall surface from which the ground is excavated, and a telescopic device that applies the plate material to the excavated wall surface by using the pile as a reaction force receiver. It is a pile structure with a pile.

In the retaining structure of the first aspect, the plate material can be applied to the excavated wall surface by the expansion / contraction device even if the pile installation accuracy is low. Therefore, it is not necessary to fill the backfill soil between the excavated wall surface and the plate material.

Second aspect, the extension device has a function of imparting a pressing load for pressing the plate into the excavation wall, a Retaining structure according to the second embodiment.

In the retaining structure of the second aspect, the expansion / contraction device presses the plate material against the excavation wall surface to counter the earth pressure of the excavation wall surface and effectively prevent the excavation wall surface from collapsing.

The third aspect is a mounting member provided between the pile and the telescopic device, to which the telescopic device is mounted and which transmits a reaction force to the pile, and a side portion of the pile which is fixed to the mounting member and adjacent to the pile. The pile-retaining structure according to the first aspect 1 or the second aspect , comprising a fixing member in contact with or in close proximity to the first aspect.

In the retaining structure of the third aspect, when the mounting member tries to move laterally, the fixing member hits the side portion of the pile and the lateral movement of the mounting member is restricted, so that the mounting member is prevented from coming off the pile. To.

According to the present invention, the plate material can be applied to the excavated wall surface without filling the backfill soil.

It is a horizontal cross-sectional view which shows the retaining structure of 1st Embodiment. It is a front view which looked at the retaining structure of 1st Embodiment from the excavation side. It is a top view which shows the mechanical jack device of 1st Embodiment. It is a construction drawing which shows typically the construction process which excavates the ground in the site and backfills a clear soil, (A) is a figure before excavation, (B) is a figure after excavation, (C) Is the figure after backfilling the clear soil. It is a construction diagram schematically showing the construction process of excavating the ground on the site and backfilling the clear soil, (A) is a diagram of the state where H-shaped steel is built in, and (B) is a horizontal sheet pile on the excavation wall surface. (C) is a diagram of the state where excavation is completed, and (D) is a diagram of the state where the clear soil is backfilled. It is a horizontal cross-sectional view which shows the retaining structure of 2nd Embodiment. It is a front view which looked at the retaining structure of 2nd Embodiment from the excavation side. It is a front view seen from the excavation side which shows the example of another form of the retaining structure of 2nd Embodiment. It is a horizontal cross-sectional view which shows the retaining structure of 3rd Embodiment. It is a top view which shows the mechanical jack device of 3rd Embodiment. It is a horizontal cross-sectional view which shows the retaining structure of 4th Embodiment. It is a top view which shows the hydraulic jack device of 4th Embodiment. It is a horizontal cross-sectional view showing a conventional retaining structure, (A) is a view of a state where a horizontal sheet pile hits an excavated wall surface, and (B) is a state where a backfill soil is filled between the horizontal sheet pile and the excavated wall surface. It is a figure of.

<First Embodiment>

The retaining structure according to the first embodiment of the present invention will be described. The arrow Z in each figure indicates a vertical direction, and the arrows X and Y indicate two orthogonal directions in a plane orthogonal to the vertical direction.

[Construction]
First, the structure of the retaining structure of the first embodiment will be described.

As shown in FIG. 1, in the retaining structure 100 of the present embodiment, the horizontal sheet pile 50 is applied to the excavated wall surface 12 excavated from the ground 10 to prevent the excavated wall surface 12 from collapsing and the outflow of earth and sand. The excavated wall surface 12 is a wall surface of a clay wall formed by excavation (see also FIG. 2).

As shown in FIGS. 1 and 2, the retaining structure 100 includes a pile, more specifically an H-shaped steel 20 as an example of a parent pile, a horizontal sheet pile 50 (see FIG. 1) as an example of a plate material, and an example of an expansion / contraction device. A mechanical jack device 120 as an example of a mounting member, a mounting plate 60 as an example of a mounting member, and a stake 66 as an example of a fixing member.

The H-section steel 20 is built in the ground 10 at intervals (along the X direction) along the excavation wall surface 12 with a gap from the excavation wall surface 12.

As shown in FIG. 1, the H-section steel 20 is composed of flanges 22 and 26 and a web 24. The mounting plate 60 is provided so as to come into contact with the outer surface 22A of the flange 22 on the excavation wall surface 12 side of the H-shaped steel 20.

As shown in FIG. 2, the mounting plates 60 are stacked and provided in the vertical direction.

As shown in FIGS. 1 and 2, mechanical jack devices 120 that expand and contract in the Y direction are attached to both end portions 62 of each mounting plate 60. A description of the mechanical jack device 120 will be described later.

As shown in FIG. 1, the end portion 52 of the horizontal sheet pile 50 is attached to the mechanical jack device 120, and the mechanical jack device 120 extends through the mounting plate 60 with the H-shaped steel 20 as a reaction force receiver. Then, the horizontal sheet pile 50 is applied to the excavation wall surface 12.

From another point of view, the mounting plate 60 is provided between the H-shaped steel 20 and the mechanical jack device 120, and the mechanical jack device 120 is mounted and the reaction force is transmitted to the H-shaped steel 20. ..

The mechanical jack device 120 on the left side of FIG. 1 is in a state (before the horizontal sheet pile 50 hits the excavation wall surface 12 before being extended), and the mechanical jack device 120 on the center and the right side is extended and the horizontal sheet pile 50 is extended. It is in a state of hitting the excavated wall surface 12.

The horizontal sheet piles 50 are also stacked in the vertical direction in the same manner as the mounting plates 60.

In the present embodiment, the horizontal sheet pile 50 and the mounting plate 60 are made of a wooden plate material, and both use the same plate material.

As shown in FIGS. 1 and 2, the surface of the end 62 of the mounting plate 60 on the opposite side to which the mechanical jack device 120 is mounted is in contact with or close to the side 22S of the flange 22 of the H-shaped steel 20. As described above, the splint 66 as an example of the fixing member is fixed.

The splint 66 is a wooden square timber arranged with the vertical direction as the longitudinal direction, and is fixed to the mounting plate 60 with nails or the like.

(Mechanical jack device)
Next, the mechanical jack device will be described.

As shown in FIG. 3, the mechanical jack device 120 includes a pantograph unit 130, a feed spiral shaft 140, and a handle member 150.

The pantograph unit 130 is a link mechanism in which four arm members 132 are combined in a substantially rhombus shape. The pantograph portion 130 is provided with a fixing portion 134 to which the horizontal sheet pile 50 or the mounting plate 60 is fixed. The fixing portion 134 is provided with a needle-shaped protrusion 136. Then, by inserting the protrusion 136 into the wooden horizontal sheet pile 50 or the mounting plate 60, the horizontal sheet pile 50 and the mounting plate 60 are fixed to the fixing portion 134.

The feed spiral shaft 140 penetrates between the opposing connecting corners 138 of the substantially rhombic pantograph portion 130. By inserting the handle member 150 into the end 142 of the feed spiral shaft 140 and rotating it, the feed spiral shaft 140 is rotated.

Then, as the feed spiral shaft 140 rotates, the distance between the connecting corner portion 138 and the connecting corner portion 138 expands and contracts, and accordingly, the fixing portion 134 (horizontal sheet pile 50) and the fixing portion 134 (mounting plate 60) become The interval expands and contracts. That is, when the distance between the connecting corner portion 138 and the connecting corner portion 138 is extended, the distance between the fixed portion 134 (horizontal sheet pile 50) and the fixing portion 134 (mounting plate 60) is reduced, and the connecting corner portion 138 and the connecting corner portion 138 are reduced. When the distance between the two is reduced, the distance between the fixed portion 134 (horizontal sheet pile 50) and the fixed portion 134 (mounting plate 60) is extended.

Further, when the feed spiral shaft 140 is further rotated from the state where the horizontal sheet pile 50 hits the excavation wall surface 12 (FIG. 1), the arm member 132 constituting the pantograph portion 130 is elastically deformed and the excavation wall surface 12 (see FIG. 1). ) Is in a state where a pressing load is applied.

The horizontal sheet pile 50 and the mounting plate 60 are fixed to the fixing portion 134 by inserting the protrusion 136 of the mechanical jack device 120 into the wooden horizontal sheet pile 50 or the mounting plate 60, but the present invention is not limited to this. It may be fixed by other methods, for example, bolting or adhesive.

[Construction method]
Next, an example of a construction method for excavating the ground 10 using the retaining structure 100 of the present embodiment will be described.

In this construction example, as shown in FIG. 4 (A), the ground 17 on the site including the contaminated soil 19 in the site boundary 18 of the factory or the like was completely excavated and removed as shown in FIG. 4 (B). Later, as shown in FIG. 4 (C), it is applied when backfilling with clear soil 25. Reference numeral 18 indicates a site boundary, reference numeral 14 indicates an excavated excavation recess, reference numeral 12 indicates an excavation wall surface which is a wall surface of the excavation recess 14 excavated as described above, and reference numeral 40 indicates a bottom surface of the excavation recess. Shows the bottom of the excavation. Then, excavation is carried out by the mountain retaining wall open cut method so that the site boundary 18 becomes the excavation wall surface 12.

First, as shown in FIG. 5 (A), a gap is opened from the site boundary 18 (excavation wall surface 12 (FIG. 4 (B), etc.)) in the ground 17 in the site along the site boundary 18 (excavation wall surface 12). H-shaped steel 20 is built. At this time, since the installation of the H-shaped steel 20 is uneven, the gap with the site boundary 18 is not constant (is uneven).

As shown in FIG. 5 (B), when the ground 17 in the site including the contaminated soil 19 is excavated to the site boundary 18, it is lateral to the fixed portion 134 (see FIG. 3) between the H-shaped steel 20 and the excavated wall surface 12. A mechanical jack device 120 in a state where the sheet pile 50 and the mounting plate 60 are fixed is arranged. At this time, the mounting plate 60 is installed so as to come into contact with the outer surface 22A of the flange 22 of the H-shaped steel 20, and as described in FIG. 3, the feed spiral shaft 140 is rotated by the handle member 150, and the fixing portion 134 ( The distance between the horizontal sheet pile 50) and the fixing portion 134 (mounting plate 60) is extended, and the horizontal sheet pile 50 is brought into contact with the excavation wall surface 12 as shown in FIG. 5 (B).

At this time, from the state where the horizontal sheet pile 50 hits the excavation wall surface 12, the feed spiral shaft 140 is further rotated by the handle member 150 to elastically deform the arm member 132 constituting the pantograph portion 130. As a result, the horizontal sheet pile 50 is pressed against the excavation wall surface 12, and a pressing load is applied to the excavation wall surface 12.

When the excavation range for one excavation is completed, the above work is performed sequentially from the bottom. The "excavation range for one excavation" is a range in the height direction in which the operator can work in the vertical direction. More specifically, the excavation recess 14 shown in FIG. 4B is not removed in one excavation step, but is removed in a plurality of excavation steps. After this one excavation process, the horizontal sheet pile 50 is pressed against the excavation wall surface 12 as described above while using the ground in contact with the site boundary 18 as the work ground. The range in the height direction in which the work of pressing the horizontal sheet pile 50 against the excavation wall surface 12 is possible is the “excavation range for one excavation”.

As shown in FIG. 5C, after the mechanical jack device 120 is arranged up to the top, the H-shaped steel 20 is placed on the opposite surface of the end 62 of the mounting plate 60 to which the mechanical jack device 120 is mounted. The spear 66 is fixed with a nail or the like so as to come into contact with or approach the side portion 22S of the flange 22.

The above work is sequentially performed on the excavation wall surface 12 formed by excavating to the site boundary 18. Further, a series of operations of excavation and pressing the horizontal sheet pile 50 against the excavation wall surface 12 are sequentially and repeatedly carried out up to the excavation bottom surface 40 of FIG. 4 (B). In the vicinity of the central portion within the target site boundary 18, it is possible to remove the ground without being directly affected by these operations. Further, it is known that when the horizontal sheet pile 50 is applied to the excavation wall surface 12, the excavation range in the vertical direction and the horizontal direction is appropriately determined, and this can be preferably carried out.

As shown in FIG. 5 (D), the ground 17 on the site (see FIG. 4 (A)) is completely removed and then backfilled with clear soil 25 (see also FIG. 4 (C)). When backfilling, the H-shaped steel 20, the horizontal sheet pile 50, the mounting plate 60, and the mechanical jack device 120 are removed.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

Even if the installation accuracy of the H-shaped steel 20 is low, the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by the mechanical jack device 120. Therefore, it is not necessary to fill the backfill soil 520 (see FIG. 13B) between the excavated wall surface 12 and the horizontal sheet pile 50.

Further, by pressing the horizontal sheet pile 50 against the excavation wall surface 12 with the mechanical jack device 120, the pressing load can counter the earth pressure of the excavation wall surface 12 and effectively prevent the excavation wall surface 12 from collapsing.

Conventionally, as shown in FIG. 13, a wedge (camber) 566 is driven between the flange 22 of the H-section steel 20 and the horizontal sheet pile 50. However, this wedge 566 is a so-called familiar one, and cannot apply a pressing load that opposes the earth pressure.

Further, when the mounting plate 60 tries to move in the lateral direction (X direction), the spear 66 hits the side portion 22S of the flange 22 of the H-shaped steel 20, and the lateral movement of the mounting plate 60 is restricted. The plate 60 is prevented from coming off the H-section steel 20, and as a result, the pressing of the excavated wall surface 12 of the horizontal sheet pile 50 is maintained.

Here, in order to cancel the area designation of the land designated by the Soil Contamination Countermeasures Law, it is required to completely remove the contaminated soil 19 in the site boundary 18 shown in FIG. 4 (A). When the contaminated soil 19 extends to the site boundary 18 and the land adjacent to the site boundary 18 cannot be used, excavation is performed by the mountain retaining wall open cut method as in the present embodiment. The case where the land adjacent to the site boundary 18 cannot be used is the case where the adjacent land is owned by another owner, the case where the land is public facilities such as roads, and the like.

When the present invention is not applied, as shown in FIG. 13 (B), the H-section steel 20 cannot be built with high accuracy, so that the backfill soil is placed between the horizontal sheet pile 50 and the site boundary 18. It becomes necessary to fill 520. However, in the case of contaminated soil countermeasures, the inside of the site boundary 18 (ground ground 17 on the site) is an area designated area (legally contaminated area), and even if the uncontaminated soil is backfilled soil 520. Even if it is used for, it is legally regarded as contaminated soil, and it is not recognized that the contaminated soil has been completely removed. Therefore, the backfill soil 520 cannot be filled between the horizontal sheet pile 50 and the excavation wall surface 12.

However, as described above, in the retaining structure 100 of the present embodiment, even if the installation accuracy of the H-shaped steel 20 is low, the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by the mechanical jack device 120, so that the excavation wall surface 12 It is not necessary to fill the backfill soil 520 (see FIG. 13B) between the sheet pile 50 and the horizontal sheet pile 50.

Therefore, the ground 17 on the site including the contaminated soil 19 in the site boundary 18 designated by the Soil Contamination Countermeasures Law can be completely removed by the mountain retaining wall open cut method without filling the backfill soil 520. It is possible to cancel the area designation of contaminated soil 19.

<Second embodiment>
The retaining structure according to the second embodiment of the present invention will be described. The same members as those in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.

[Construction]
First, the structure of the retaining structure 200 of the second embodiment will be described.

In the first embodiment, the mechanical jack device 120 is attached to the end portion 62 of the mounting plate 60, but as shown in FIGS. 6 and 7, in the present embodiment, the mechanical jack device 120 is the mounting square member 260. The difference is that it is attached to the central portion 263.

As shown in FIG. 6, the wooden mounting square member 260 as an example of the mounting member is provided so as to come into contact with the outer surface 22A of the flange 22 on the excavation wall surface 12 side of the H-shaped steel 20.

As shown in FIGS. 6 and 7, a mechanical jack device 120 that expands and contracts in the Y direction is attached to the central portion 263 of each mounting square member 260. As shown in FIG. 7, the mounting square member 260 is fixed to the fixing portion 134 by inserting the needle-shaped protrusion 136 of the fixing portion 134 of the mechanical jack device 120 into the wooden mounting square member 260.

The protrusion 136 of the mechanical jack device 120 may not be fixed by inserting it into the wooden mounting square member 260, but may be fixed by another method such as bolt fastening or an adhesive.

As shown in FIGS. 6 and 7, the mechanical jack device 120 is attached to the central portion 53 (see FIG. 6) of the horizontal sheet pile 50, and the mechanical jack device 120 attaches the H-shaped steel 20 via the mounting square bar 260. The horizontal sheet pile 50 is applied to the excavated wall surface 12 by extending as a reaction force receiver.

From another point of view, the mounting square member 260 is provided between the H-shaped steel 20 and the mechanical jack device 120, and the mechanical jack device 120 is mounted and the reaction force is transmitted to the H-shaped steel 20. ..

The mechanical jack device 120 on the left side of FIG. 6 is in a state (before the horizontal sheet pile 50 hits the excavation wall surface 12 before being extended), and the mechanical jack device 120 on the center and the right side is extended and the horizontal sheet pile 50 is extended. It is in a state of hitting the excavated wall surface 12.

As shown in FIGS. 6 and 7, the opposite surface of the end portion 262 of the mounting square timber 260 to which the mechanical jack device 120 is mounted is in contact with or close to the side portion 22S of the flange 22 of the H-shaped steel 20. As described above, the splint 66 is fixed.

[Construction method]
Next, an example of a construction method for excavating the ground 10 using the retaining structure 200 of the present embodiment will be described. Since the details have been described in the first embodiment, only the main parts will be described in the present embodiment.

When the on-site ground 17 (see FIG. 4) containing the contaminated soil 19 is excavated to the site boundary 18 (see FIGS. 5 (A) and 5 (B)), it is placed between the excavated wall surface 12 of the H-shaped steel 20. A mechanical jack device 120 in a state where the horizontal sheet pile 50 and the mounting square member 260 are fixed to the fixing portion 134 (see FIG. 3) is arranged. At this time, the mounting square lumber 260 is installed so as to come into contact with the outer surface 22A of the flange 22 of the H-shaped steel 20, the feed spiral shaft 140 is rotated by the handle member 150 (see FIG. 3), and the fixing portion 134 (horizontal sheet pile 50). ) And the fixing portion 134 (mounting square timber 260) are extended, and the horizontal sheet pile 50 is brought into contact with the excavation wall surface 12.

At this time, from the state where the horizontal sheet pile 50 hits the excavation wall surface 12, the feed spiral shaft 140 is further rotated by the handle member 150 to elastically deform the arm member 132 constituting the pantograph portion 130. As a result, the horizontal sheet pile 50 is pressed against the excavation wall surface 12, and a pressing load is applied to the excavation wall surface 12.

The above work is performed sequentially from the bottom. That is, the mechanical jack device 120 in which the horizontal sheet pile 50 and the mounting square timber 260 are fixed to the fixing portion 134 is sequentially arranged from the bottom, and the horizontal sheet pile 50 is pressed against the excavation wall surface 12.

After arranging the mechanical jack device 120 to the top, the end portion 262 of the mounting square timber 260 is in contact with or close to the side portion 22S of the flange 22 of the H-shaped steel 20 on the opposite surface to which the mechanical jack device 120 is mounted. The sockliner 66 is fixed with a nail or the like.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

Even if the installation accuracy of the H-shaped steel 20 is low, the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by the mechanical jack device 120. Therefore, it is not necessary to fill the backfill soil 520 (see FIG. 13B) between the excavated wall surface 12 and the horizontal sheet pile 50. Further, by pressing the horizontal sheet pile 50 against the excavation wall surface 12 with the mechanical jack device 120, the pressing load can counter the earth pressure of the excavation wall surface 12 and effectively prevent the excavation wall surface 12 from collapsing.

The mounting square member 260 has higher rigidity than the mounting plate 60 of the first embodiment (see FIG. 1 and the like). Therefore, since the mechanical jack device 120 may be provided at the central portion 263 of the mounting square lumber 260, the number of mechanical jack devices 120 installed is reduced, and as a result, the construction man-hours are reduced.

When the earth pressure of the excavated wall surface 12 is small, the mechanical jack is made by increasing the arrangement interval of the mounting square timbers 260 in the depth direction (Z direction) as in the retaining structure 201 of another example of FIG. The number of installations of the device 120 is further reduced, and as a result, the construction man-hours are further reduced.

<Third Embodiment>
The retaining structure according to the third embodiment of the present invention will be described. The same members as those in the first embodiment and the second embodiment are designated by the same reference numerals, and redundant description will be omitted.

[Construction]
First, the structure of the retaining structure of the third embodiment will be described.

In the first embodiment and the second embodiment, the mechanical jack device 120 is attached to the mounting plate 60 or the mounting square timber 260, but as shown in FIGS. 9 and 10, in the present embodiment, the mechanical jack device 120 is attached. The 320 is directly attached to the H-shaped steel 20.

As shown in FIG. 10, one fixing portion 134 of the pantograph portion 130 constituting the mechanical jack device 320 is provided with a fixing mechanism portion 330. The fixing mechanism portion 330 includes a U-shaped U-shaped portion 334 and a fixed spiral shaft portion 332.

Then, as shown in FIGS. 10 and 11, the mechanical jack device 320 is arranged so that the flange 22 of the H-shaped steel 20 is located between the U-shaped portions 334, and is tightened by the fixed spiral shaft portion 332. , Fixed to H-section steel 20.

[Construction method]
Next, an example of a construction method for excavating the ground 10 using the retaining structure 300 of the present embodiment will be described. Since the details have been described in the first embodiment, only the main parts will be described in the present embodiment.

When the on-site ground 17 (see FIG. 4) including the contaminated soil 19 is excavated to the site boundary 18 (see FIGS. 5 (A) and 5 (B)), a horizontal sheet pile 50 is attached to the fixed portion 134 (see FIG. 3). The mechanical jack device 320 in the fixed state is fixed to the flange 22 of the H-shaped steel 20. The feed spiral shaft 140 is rotated by the handle member 150 (see FIG. 3), and the horizontal sheet pile 50 is brought into contact with the excavation wall surface 12.

At this time, from the state where the horizontal sheet pile 50 hits the excavation wall surface 12, the feed spiral shaft 140 is further rotated by the handle member 150 to elastically deform the arm member 132 constituting the pantograph portion 130. As a result, the horizontal sheet pile 50 is pressed against the excavation wall surface 12, and a pressing load is applied to the excavation wall surface 12.

The above work is performed sequentially from the bottom. That is, the mechanical jack device 320 in which the horizontal sheet pile 50 is fixed to the fixing portion 134 is sequentially fixed to the flange 22 of the H-shaped steel 20 from the bottom, and the horizontal sheet pile 50 is pressed against the excavation wall surface 12.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

Even if the installation accuracy of the H-shaped steel 20 is low, the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by the mechanical jack device 320. Therefore, it is not necessary to fill the backfill soil 520 (see FIG. 13B) between the excavated wall surface 12 and the horizontal sheet pile 50. Further, by pressing the horizontal sheet pile 50 against the excavation wall surface 12 with the mechanical jack device 320, the pressing load can counter the earth pressure of the excavation wall surface 12 and effectively prevent the excavation wall surface 12 from collapsing.

Further, since the mechanical jack device 320 is fixed to the flange 22 of the H-shaped steel 20 by the fixing mechanism portion 330, it is prevented from coming off from the H-shaped steel 20, and as a result, the excavated wall surface 12 of the horizontal sheet pile 50 is pressed. Is maintained.

<Fourth Embodiment>
The retaining structure according to the fourth embodiment of the present invention will be described. The same members as those in the first to third embodiments are designated by the same reference numerals, and redundant description will be omitted.

[Construction]
First, the structure of the retaining structure of the fourth embodiment will be described.

In the first to third embodiments, the horizontal sheet pile 50 was applied to the excavation wall surface 12 by the mechanical jack device 120 (see FIG. 3), but as shown in FIG. 11, in the present embodiment, the hydraulic jack is used. The horizontal sheet pile 50 is brought into contact with the excavation wall surface 12 by the device 420.

As shown in FIGS. 11 and 12, a hydraulic jack device 420 that expands and contracts in the Y direction is attached to each mounting plate 60. The hydraulic jack device 420 will be described later.

A horizontal sheet pile 50 is attached to each hydraulic jack device 420, and the horizontal sheet pile 50 is applied to the excavation wall surface 12 by extending the hydraulic jack device 420 with the H-shaped steel 20 as a reaction force receiver.

From another point of view, the mounting plate 60 is provided between the H-shaped steel 20 and the hydraulic jack device 420, and the hydraulic jack device 420 is mounted and the reaction force is transmitted to the H-shaped steel 20. ..

(Hydraulic jack device)
Next, the hydraulic jack device 420 will be described.

As shown in FIG. 12, the hydraulic jack device 420 has a bag body 426 whose side surface 424 has a bellows shape (accordion structure). An injection port 422 for injecting a liquid such as water is formed on the upper surface of the bag body 426.

A horizontal sheet pile 50 is bonded to the front surface portion 426A of the bag body 426 with an adhesive or the like, and a mounting plate 60 is bonded to the rear surface portion 426B with an adhesive or the like. That is, the bag body 426, the horizontal sheet pile 50, and the mounting plate 60 are integrated.

A plurality of protrusions 136 (see FIG. 3) are provided on the front surface portion 426A, and the protrusions 136 may be integrated by inserting the protrusions 136 into the horizontal sheet pile 50. Similarly, a plurality of protrusions 136 (see FIG. 3) are provided on the rear surface portion 426B, and the protrusions 136 may be integrated by inserting the protrusions 136 into the mounting plate 60.

Then, by opening the injection port 422 and injecting water into the bag body 426, the bag body 426 swells and the distance between the front surface portion 426A (horizontal sheet pile 50) and the rear surface portion 426B (mounting plate 60) is widened, and the injection port 422 is opened. close. The injection port 422 is provided with a check valve or the like (not shown) so that the injected water does not flow back. Although the name is "hydraulic type", a liquid other than water may be injected.

[Construction method]
Next, an example of a construction method for excavating the ground 10 using the retaining structure 400 of the present embodiment will be described. Since the details have been described in the first embodiment, only the main parts will be described in the present embodiment.

When the on-site ground 17 (see FIG. 4) containing the contaminated soil 19 is excavated to the site boundary 18 (see FIGS. 5 (A) and 5 (B)), it is placed between the excavated wall surface 12 of the H-shaped steel 20. A hydraulic jack device 420 with the horizontal sheet pile 50 and the mounting plate 60 fixed to the front surface portion 426A and the rear surface portion 426B (see FIG. 12) of the bag body 426 is arranged.

At this time, the mounting plate 60 is installed so as to come into contact with the outer surface 22A of the flange 22 of the H-shaped steel 20. Then, water is injected into the bag body 426 from the injection port 422, the bag body 426 is inflated, the distance between the front surface portion 426A (horizontal sheet pile 50) and the rear surface portion 426B (mounting plate 60) is widened, and the horizontal sheet pile 50 is placed on the excavation wall surface 12. Hit.

The above work is performed sequentially from the bottom. That is, the hydraulic jack device 420 in which the horizontal sheet pile 50 and the mounting plate 60 are fixed to the bag body 426 are sequentially arranged from the bottom, and the horizontal sheet pile 50 is pressed against the excavation wall surface 12.

After arranging the hydraulic jack device 420 to the top, the end 62 of the mounting plate 60 comes into contact with or close to the side portion 22S of the flange 22 of the H-shaped steel 20 on the opposite surface to which the hydraulic jack device 420 is mounted. The sockliner 66 is fixed with a nail or the like.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

Even if the installation accuracy of the H-shaped steel 20 is low, the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by the hydraulic jack device 420. Therefore, it is not necessary to fill the backfill soil 520 (see FIG. 13B) between the excavated wall surface 12 and the horizontal sheet pile 50.

Further, since the horizontal sheet pile 50 is supported by the entire front surface portion 426A of the bag body 426 of the hydraulic jack device 420, the bending of the horizontal sheet pile 50 is suppressed, the horizontal sheet pile 50 is in close contact with the excavation wall surface 12, and the excavation wall surface 12 collapses. Can be effectively prevented.

In addition, from the state where the horizontal sheet pile 50 hits the excavation wall surface 12 on the bag body 426 of the hydraulic jack device 420, water is further injected by a pump to seal the injection port 422 and the internal pressure is applied. Then, the horizontal sheet pile 50 may be pressed against the excavation wall surface 12 and a pressing load may be applied to the excavation wall surface 12.

Further, the bag body 426 of the hydraulic jack device 420 may be in a state where internal pressure is applied by injecting gas instead of water with a pump.

<Others>
The present invention is not limited to the above embodiment.

For example, in the first to third embodiments, after the horizontal sheet pile 50 hits the excavation wall surface 12, the feed spiral shaft 140 is further rotated by the handle member 150, and the horizontal sheet pile 50 is pressed against the excavation wall surface 12. , The excavation wall surface 12 is in a state where a pressing load is applied, but the present invention is not limited to this. The horizontal sheet pile 50 is only applied to the excavation wall surface 12, and it is not necessary to apply a pressing load.

Further, for example, in the first embodiment and the second embodiment, the mounting plate 60 and the mounting square timber 260 are arranged so as to be in contact with the flange 22 on the excavation wall surface 12 side of the H-shaped steel 20, but the present invention is not limited to this. .. It may be arranged so as to be in contact with the flange 26 on the opposite side. The mechanical jack device 120 and the hydraulic jack device 420 are appropriately arranged so as not to interfere with the flange 22. In short, it suffices if the horizontal sheet pile 50 can be applied to the excavation wall surface 12 by using the H-shaped steel 20 as a reaction force receiver.

Further, for example, in the above embodiment, the H-shaped steel 20 is used as an example of the pile, but the present invention is not limited to this. It may be a shaped steel other than the H-shaped steel 20, or it may be a columnar or prismatic pile.

Further, for example, in the above embodiment, the mechanical jack devices 120 and 320 and the hydraulic jack device 420 are used as the telescopic device, but the present invention is not limited thereto. For example, a hydraulic jack device may be used. Alternatively, it may be inflated by injecting a gas or liquid into a bag made of an elastic body such as rubber, such as a balloon. That is, any expansion / contraction device that can hit a plate material such as a horizontal sheet pile 50 against the excavation wall surface 12 by using a pile such as H-shaped steel 20 as a reaction force receiver.

Further, for example, in the above-mentioned actual form, the horizontal sheet pile 50, the mounting plate 60, and the mounting square member 260 are made of wood, but the present invention is not limited thereto. It may be a resin or metal plate material and a mounting member. Any method may be used for fixing the resin or metal plate material and the mounting member to the expansion / contraction device. For example, an insertion hole for inserting the protrusion 136 may be formed in the plate material and the mounting member, may be fixed by bolting, or may be fixed by an adhesive.

Further, in the above embodiment, the method is applied to the retaining wall open-cut method for completely excavating and removing the ground 17 on the site including the contaminated soil 19 in the site boundary 18 of a factory or the like, but the present invention is not limited to this. The present invention is particularly effective when excavating with the site boundary as an excavation wall surface such as removal of contaminated soil or a seismic isolation pit, and when the adjacent land cannot be used on a road or the like.

The present invention is not limited to the above embodiment. Needless to say, it can be carried out in various embodiments without departing from the gist of the present invention.

12 Excavation wall surface 20 H-section steel (example of pile)
50 Horizontal sheet pile (an example of plate material)
60 Mounting plate (an example of mounting member)
66 Splint (an example of fixing member)
100 Retaining structure 120 Mechanical jack device (an example of telescopic device)
200 Retaining structure 260 Mounting square lumber (Example of mounting member)
300 Retaining structure 320 Mechanical jack device (an example of telescopic device)
400 Retaining structure 420 Hydraulic jack device (an example of telescopic device)

Claims (4)

Pile built at intervals in the ground,
The plate material that hits the excavated wall surface where the ground was excavated,
An expansion / contraction device that uses the pile as a reaction force receiver and applies the plate material to the excavation wall surface.
An attachment member provided between the pile and the expansion / contraction device, to which the expansion / contraction device is attached and which transmits a reaction force to the pile,
A fixing member fixed to the mounting member and in contact with or close to the side portion of the adjacent pile.
Retaining structure with. Pile built at intervals in the ground,
The plate material that hits the excavated wall surface where the ground was excavated,
An expansion / contraction device that uses the pile as a reaction force receiver and applies the plate material to the excavation wall surface.
Prepare
The telescopic device has a function of elastically deforming the plate material against the excavated wall surface and applying a pressing load to press the plate material.
Mountain retaining structure. The telescopic device has a pantograph portion which is a link mechanism in which four arm members are combined in a substantially rhombus shape, and a feed spiral shaft penetrating between opposing connecting corner portions in the pantograph portion having a substantially rhombus shape. By rotating the feed spiral shaft, the connecting corners facing each other extend to hit the plate material against the excavation wall surface, and the arm member elastically deforms to press the plate material against the excavation wall surface. It is a mechanical jack that takes
The retaining structure according to claim 2. Pile built at intervals in the ground,
The plate material that hits the excavated wall surface where the ground was excavated,
An expansion / contraction device that uses the pile as a reaction force receiver and applies the plate material to the excavation wall surface.
Prepare
The expansion / contraction device has a bag body in which the plate material is integrated and has a bellows shape on the side surface, and when a liquid is injected into the bag body, the bag body expands and the water pressure for applying the plate material to the excavation wall surface. It's a formula jack,
Mountain retaining structure.

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