JP2016186160A - Outside planar liner plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vertical shaft to be configured without having a person enter the vertical shaft when configuring the vertical shaft using a press-in construction method, by enabling assembly work for a cylindrical liner plate body (an earth retaining wall body) to be performed at an excavation position of the vertical shaft and from outside the liner plate.SOLUTION: An outside planar liner plate 1 includes a circular arc liner plate 3, and a planar member 2 fitted on an outer side of the circular arc liner plate. The liner plate 3 includes a fitting part (a notch 5) for the planar member at top and bottom positions on the outer side thereof. The planar member 2 includes an axial direction length L covering at least a corrugated part of the liner plate, and a peripheral direction length M that covers a part or a whole in the peripheral direction on the outer side of the liner plate, and furthermore includes a fitted part 7 (a hook part) to be fitted detachably with the fitting part 5 for the planar member at top and bottom positions of the liner plate, the fitted part being provided on top and bottom positions on an inner side.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an outer planar liner plate suitable for application to a liner plate used as a retaining wall when constructing a shaft such as a deep foundation pile or a drainage well.

When constructing shafts such as deep piles and drainage wells, arc-shaped liner plates are widely used as retaining walls. In this case, the retaining wall by the liner plate is generally constructed by repeating ground excavation and a work in which a person enters the excavated ground and assembles the liner plate from the inside of the arc of the liner plate.
However, since the liner plate assembly work in the mine is an alternate work of assembly work and ground excavation, the work efficiency is also poor, so in recent years the construction method of building the liner plate retaining wall without entering the mine Is being considered.

In order to build the liner plate retaining wall without entering the mine, the liner plate is connected in the circumferential direction to assemble the ring-shaped liner plate cylindrical body (the retaining wall body) and the cylindrical body in the axial direction. It is necessary to perform the operation of connecting to the outside of the arc of the liner plate on the ground.
In order to enable assembly of the liner plate cylinder from the outside of the liner plate, the liner plate is reverse-bent (that is, the liner plate is bent in the direction of the arc (or direction of curvature)). (Patent Document 1 (Japanese Patent Laid-Open No. 2000-120367)). The reverse bending liner plate is a liner plate in which upper and lower circumferential flanges protrude outside the arc.
However, because this liner plate reverse bending process requires a huge investment in capital investment, the liner plate is used while using a normal liner plate that is bent normally with the upper and lower circumferential flanges protruding inside the arc. Some have made it possible to assemble the cylindrical body from the outside of the liner plate (Patent Documents 2 and 3).

  The deep foundation method of Patent Document 2 will be described using the reference numerals in Patent Document 2. A rectangular frame-shaped support frame 5 is installed at a shaft excavation position, then the shaft is excavated with an excavator, and then piled in advance. The first liner plate unit 11 formed by assembling one stage of the liner plate cylindrical body and fixing the connecting ring 12 to the circumferential flange at the upper end thereof is hung by a crane and placed on the support frame 5. Next, the shaft is excavated to a predetermined depth with an excavator, and then the first liner plate unit 11 having the connection ring 12 fixed to the circumferential flanges at the upper and lower ends is placed on the support frame 5 first. It is arranged on the liner plate unit 11, and the connecting rings 12 of the upper and lower liner plate units 11 are connected to each other with bolts, and then hung again with a crane to be predetermined in the shaft. Only away lowering, to construct a vertical shaft by repeating the work of (see FIG. 5 of Patent Document 2).

  The construction method of Patent Document 3 is basically the same as that of Patent Document 1, and will be described using the reference numerals in Patent Document 3 to connect the upper and lower circumferential flanges of the liner plate cylinder (cylindrical wall body 60). The tool 32 is used for connection. Then, (1) a cylindrical wall body forming step of connecting the liner plate 2 to form the first-stage cylindrical wall body 60, and (2) an excavating step of excavating the lower portion of the cylindrical wall body 60 to form the pit 56. And (3) a dropping step of dropping the cylindrical wall body 60 into the pit 56, and (4) a construction step of constructing the next-stage cylindrical wall body 60 on the upper edge of the cylindrical wall body 60. ), The steps (2) to (4) are sequentially repeated to form the foundation pile to a predetermined depth (see [0055] of Patent Document 3 and FIG. 20).

By the way, in the case of a construction method in which a shaft is constructed by alternately excavating the shaft and assembling the liner plate cylinder, the liner plate cylinder is suspended by a crane or the like and dropped into the shaft (descent) There is a construction method in which the liner plate cylindrical body is press-fitted into a vertical shaft.
In this case, the liner plate is a corrugated steel plate, and since the friction resistance of the outer peripheral surface is large to press-fit the liner plate cylinder into the shaft, the liner plate is welded or bonded to the outer peripheral surface of the liner plate. It is necessary to smooth the entire outer surface of the cylinder.
For example, in Patent Documents 4 and 5, in order to reduce the frictional resistance, an outer configuration in which a smooth skin plate 23 (outer layer body 3) is fixed to the entire outer surface (outer peripheral surface side) of the liner plate 2 (inner layer body 2). The piece 21 (segment 1) is used. In addition, the code | symbol outside a parenthesis is a code | symbol in patent document 4 (Unexamined-Japanese-Patent No.7-11862), and the code | symbol in parentheses is a code | symbol in patent document 5 (Unexamined-Japanese-Patent No. 3-244790).
In addition, in deep foundation piles, it is also considered to draw out liner plate retaining walls and divert to other deep foundation pile constructions. It is necessary to smooth the outer peripheral surface of the plate cylinder.

JP 2000-120367 A JP2011-58189A JP2011-106190A JP 7-11862 A JP-A-3-244790

According to the liner plates of Patent Documents 4 and 5 described above, the outer peripheral surface becomes smooth, so that when the press-fitting method is employed, it can be smoothly press-fitted.
However, when the outer peripheral surface of the liner plate is covered with a member such as a skin plate or an outer layer body as in Patent Documents 4 and 5, especially bolt connection between axial flanges (bolt connection when assembling into a cylindrical shape) is performed. Since it cannot be performed from the outside, it is necessary to assemble the liner plate cylindrical body in advance in order not to perform bolt connection work in the pit. To that end, there must be a large space on the ground for assembling work, but deep foundation piles and the like are constructed in mountains, and it is often impossible to secure a space for such work.
For this reason, when the space for assembling the liner plate cylindrical body cannot be secured, it is difficult to smoothly construct a shaft while reducing the friction with the well wall while adopting the press-fitting method.
Even if the liner plate cylinder assembly work space can be secured, as shown in Patent Documents 4 and 5, the outer surface of the liner plate cylinder is smoothed by welding or bonding an iron plate or the like to the outer periphery of the liner plate. In this method, it is very difficult to remove the liner plate cylinder when dismantling the retaining wall. Moreover, a welder for welding an iron plate or the like is required, which takes time and cost.

  The present invention was made based on the above-described conventional background, and when a shaft such as a deep foundation pile is constructed by adopting a press-fitting method, a shaft can be constructed without entering a mine, It is possible to assemble the liner plate cylinder at the upper position of the shaft excavation, and it is not necessary to secure a wide working space for the assembly. In addition, unlike the method of fixing an iron plate etc. to the outer peripheral surface of the liner plate, the workability It is an object of the present invention to provide a liner plate that can improve the cost and reduce the cost, and that allows easy removal of the liner plate cylinder when dismantling the retaining wall.

The invention of claim 1 that solves the above-described problem is an outer planar liner plate that includes an arc-shaped liner plate and a planar member attached to the outer side of the arc of the liner plate,
The liner plate has a planar member mounting portion at the upper and lower positions outside thereof,
The planar member has an axial length L that covers at least the corrugated portion of the liner plate and a circumferential length M that covers a part or all of the outer circumferential direction of the liner plate. A mounting portion that is detachably engaged with the planar member mounting portion at the vertical position is provided at an inner vertical position.

  According to a second aspect of the present invention, in the outer planar liner plate of the first aspect, the outer length of the liner plate has an axial length covering at least the corrugated portion of the liner plate and a circumferential length shorter than the circumferential length of the liner plate. The front surface member is attached in advance, and the surface member is attached to an opening between one end of the front surface member and the axial flange of the liner plate.

  According to a third aspect of the present invention, in the outer planar liner plate of the second aspect, the one end portion of the planar member on the leading planar member side is connected to the one end side portion of the leading planar member and the outside of the liner plate. It is characterized by providing an insertion part to be inserted therebetween.

  According to a fourth aspect of the present invention, in the outer planar liner plate according to any one of the first to third aspects, the planar member mounting portion at the upper and lower positions of the liner plate is laterally long in the circumferential direction and has one lateral portion in the lateral direction. A large-size notch that is long in the vertical direction and a small-size notch on the other side is short in the vertical direction, and the mounted portion of the planar member is a protrusion that can be inserted into and engaged with the notch, The projecting part of the sheet-like member is inserted from the large-size part on one side of the notch of the planar member-attaching part of the liner plate and is slid laterally to attach the planar member to the liner plate in the other small-sized part. It is characterized by being able to.

  According to a fifth aspect of the present invention, in the outer planar liner plate according to the fourth aspect, the upper and lower notches of the liner plate are arranged such that the one side large size portion in the lateral direction is the end side above and below the liner plate from the other small size portion. It is characterized by the fact that the height positions of the upper and lower central sides of the two are aligned and have a generally symmetrical shape.

  6. The outer planar liner plate according to claim 4, wherein the two upper and lower cutouts of the liner plate are such that the one side large size portion in the lateral direction is above and below the other side small size portion. The height positions of the upper and lower end sides of the two are aligned, and are generally symmetrical in the vertical direction.

  According to a seventh aspect of the present invention, in the outer planar liner plate of the fourth aspect, each of the upper and lower notches of the liner plate is such that the one side large size portion in the lateral direction is higher than the other side small size portion. It spreads to one of the lower sides, and the other side of the lower side or the upper side is aligned.

According to the outer planar liner plate of the present invention, the wave portion outside the liner plate cylindrical body (the retaining wall body) can be covered with the planar member. When building, the friction with the natural ground can be reduced, and the shaft can be easily constructed without people entering the mine.
Further, since the liner plate cylinder assembly work can be performed at the shaft excavation position, it is not necessary to secure a wide work space for the assembly.

  In addition, a mounting portion that is detachably engaged with a planar member mounting portion formed on the outer side of the liner plate is provided on the inner side, and a part or all of the outer circumferential direction of the liner plate is covered with the planar member. Therefore, the frictional resistance of the outer peripheral surface when the liner plate cylinder is press-fitted is small, and the shaft construction by the press-fitting method can be performed smoothly.

Further, unlike the method of fixing an iron plate or the like to the outer peripheral surface of the liner plate with welding or an adhesive to smooth the outer peripheral surface, welding work and bonding work are not required, and workability is good and the cost can be reduced.
Furthermore, according to the present invention, when removing the liner plate cylinder, the planar member for smoothing can be removed after being pulled out from the shaft, so that the liner plate cylinder when dismantling the retaining wall can be removed. Easy to remove.

1 shows an outer planar liner plate according to an embodiment of the present invention, where (A) is a front view, (B) is a schematic AA sectional view, and (C) is an enlarged detail of part B of (B). FIG. FIG. 2 shows an outer planar liner plate with the planar member removed in FIG. 1, (A) is a front view, (B) is a schematic CC sectional view, and (C) is a D part of (A). It is an enlarged view. 1A and 1B show a planar member, in which FIG. 1A is a front view, FIG. 1B is a left side view, and FIG. 1C is a plan view. The procedure for attaching the planar member to the outer planar liner plate in the state of FIG. 2 with the planar member removed will be described, and the mounting procedure is indicated by (A), (B), and (C). (A), (b), and (c) are enlarged plan views of main parts corresponding to FIGS. 4 (a), (b), and (c), respectively. The outer side surface liner plate which attached the surface member of the other Example is shown, (A) is a front view, (B) is a schematic EE sectional drawing. FIG. 7 shows a planar member in FIG. 6, (A) is a front view, (B) is a left side view, and (C) is a plan view. In the outer planar liner plate of FIG. 6, the procedure for attaching the planar member will be described, and the installation procedure is indicated by (A), (B), and (C). (A), (B), and (C) are enlarged plan views of main parts corresponding to FIGS. 8 (A), (B), and (C), respectively. The other example about the attachment part (hook part) especially of a planar member is shown, (A) is a side view of a planar member, (B) is an F section enlarged view of (A), (C) Is an enlarged view of the planar member mounting portion on the liner plate side with which the hook portion of the planar member engages. (D) is a side view showing still another embodiment of the planar member, particularly the mounted portion (hook portion). FIG. The other example about the planar member attachment part by the side of a liner plate and the to-be-attached part by the side of a planar member is shown, (a) is a front view of the vicinity of the planar member attachment part in a liner plate. is there. (B) is a front view of the planar member, (C) is the left side view, and (D) is the plan view. Figures (b '), (c') and (d ') are enlarged views of the figures (b), (c) and (d), respectively. It is a perspective view of the liner plate of the said Example. It is a figure explaining the point which builds a shaft using the outer side planar liner plate of the said Example. It is a figure which shows the bolt connection part of the circumferential direction of outer side surface liner plates.

  Hereinafter, the form for implementing the outside planar liner plate of the present invention is explained with reference to drawings.

FIG. 1 shows an outer planar liner plate 1 according to an embodiment of the present invention. (A) is a front view, (B) is a schematic AA sectional view, and (C) is part B of (B). FIG. 2 shows the outer planar liner plate 1 with the planar member 2 in FIG. 1 removed, where (A) is a front view, (B) is a schematic CC sectional view, and (C) is ( It is the D section enlarged view of a).
The outer planar liner plate 1 includes an arc-shaped liner plate 3 and the planar member 2 attached to the outer side of the arc of the liner plate 3.

As shown in FIG. 12, the liner plate 3 includes a circumferential flange 3 a formed by bending the end of the main body on the top and bottom of the corrugated steel plate, and an axial flange 3 b formed by welding and fixing the plates to the left and right ends. . In the present invention, a general liner plate that is curved in an arc shape in such a manner that the bending direction of the arc is forward bending instead of reverse bending, that is, the circumferential flange 3a protrudes inward is used.
The upper and lower circumferential flanges 3a are provided with a plurality of bolt holes 3c for bolting the liner plates 3 to each other in the axial direction (longitudinal direction). The liner flanges 3b are arranged on the axial flanges 3b on both sides in the circumferential direction. A plurality of bolt holes 3d for bolt connection in the circumferential direction (lateral direction) are provided.
And the liner plate 3 of this invention has the planar member attaching part 5 for attaching the said planar member 2 in the vertical position of the outer side, as shown in detail in FIG. 1, FIG. 2, etc. . In the embodiment, as the planar member attaching portion 5, a notch described in detail later is formed in the upper and lower flat portions 3 e directly connected to the upper and lower circumferential flanges 3 a of the liner plate 3.
In a typical liner plate, the bolt hole of the axial flange 3b is formed inside the arc of the corrugated steel sheet. In this embodiment, the bolt connection between the axial flanges 3b is connected to the outside of the liner plate 3. As shown in the figure, the bolt hole 3d of the axial flange 3b is provided outside the arc of the corrugated steel sheet.
As shown in FIG. 1 (a), a nut 9 for bolt connection is welded and fixed at the position of the bolt hole 3d on the inner surface of the axial flange 3b opposite to the planar member 2 of the liner plate 3. ing. The nut 9 is formed by narrowing the width of the front surface member 6 to be described later so that an opening is formed in the vicinity of the axial flange 3b on the opposite side of the surface member 2, and the nut 9 is manually inserted. Since it can hold | maintain, it is not necessary to fix by welding beforehand.

The planar member 2 is made of a steel plate, and has an axial length (longitudinal length) L (see FIG. 3) covering at least the corrugated portion of the liner plate 3 (the corrugated portion excluding the upper and lower flat portions 3e). ) And a circumferential length (lateral length) M covering a part (a part on the left side in FIG. 1A) in the illustrated example in the circumferential direction outside the liner plate 3. In this embodiment, the leading planar member 6 is attached to a portion of the outer side of the liner plate 3 where the planar member 2 is not present (the wide portion on the right side in the figure). In the embodiment, the leading surface member 6 is fixed to the liner plate 3 by welding, an adhesive, or the like, or the surface member mounting portion 5 can be attached to and detached from the leading surface member 6 in the same manner as the surface member 2. It may be provided.
The planar member 2 further includes a mounted portion 7 that is detachably engaged with the planar member mounting portion 5 that is the notch in the vertical position of the liner plate 3 at the vertical position inside thereof.
The to-be-attached part 7 of an Example is a hook part provided in the center position of the upper-lower end of the main-body part (rectangular flat plate part) of the planar member 2, respectively. The attached portion 7 which is the hook portion is formed by extending and folding a part of the plate material of the planar member 2. Note that another part may be fixed to the planar member 2 to form the hook portion. Further, notches 2a for inserting, for example, a thin bar-like tool into the left and right side edges of the planar member 2 so as to be easily removed when the planar member 2 is removed from the outer planar liner plate 1. Is provided.
In the embodiment, the planar member 2 is made of a steel plate. However, the planar member 2 may be made of resin and may be anything as long as it is a planar member.
Moreover, although the product made from a steel plate is used for the leading planar member 6 in the Example, it may be resin-made and anything may be used if it is a planar member.

The notch which is the planar member mounting portion 5 provided in the liner plate 3 is horizontally long in the circumferential direction as shown in an enlarged view in FIG. 2C, and one side portion 5a in the horizontal direction is long in the vertical direction. Large size, the other side portion 5b is a small size notch that is short in the vertical direction, and the horizontal one side large size portion 5a is above and below the other side small size portion 5b at the center side above and below the liner plate (lower side in the figure) The height positions of the upper and lower end sides (upper side in the figure) of both are aligned.
On the other hand, the mounted portion 7 of the planar member 2 is a hook portion as described above, and can be inserted into and engaged with the planar member mounting portion 5 (notch).
Then, the attached portion 7 (hook portion) of the planar member 2 is inserted from the one-side large size portion 5a of the planar member attaching portion 5 (notch) of the liner plate 3, and is slid in the lateral direction to be small on the other side. The planar member 2 is attached to the liner plate 3 by moving to the position of the size portion 5b.

  In this embodiment, the mounted portions 7 (hook portions) at the upper and lower ends of the planar member 2 are vertically symmetric shapes facing each other as shown in FIG. Since the shape of the member mounting portion 5 (notch) is also symmetrical in the vertical direction, the planar member 2 is restrained from moving upward or downward. Accordingly, it is possible to prevent the cylindrical earth retaining wall body (liner plate cylindrical body) from coming off against frictional force in any direction that acts on the planar member 2 during press-fitting or drawing-out.

An example of the operation | work at the time of constructing the shaft retaining wall by said outer side planar liner plate 1 is demonstrated with reference to FIG.
In this embodiment, when constructing the shaft retaining wall, as shown schematically in FIGS. 13 (g) and 13 (h), both or one of the upper and lower circumferential flanges 3a of each outer planar liner plate 1 (the figure is shown). In both cases, the outer surface liner plate 1A with a ring piece is used in which a ring piece 11a having a groove-shaped cross section curved in the same arc shape as the liner plate 3 is bolted in advance. The ring piece 11 a is a member that forms a connection ring 11 interposed between the upper and lower liner plate cylinders 12.
Bolt holes are provided in the upper and lower flange portions of the ring piece 11a at the same positions as the bolt holes 3c formed in the circumferential flange 3a of the liner plate 3, and the flange portions of the circumferential flange 3a of the liner plate 3 and the ring piece 11a are provided. The bolt connection is performed in the same manner as the bolt connection between the circumferential flanges 3 a of the upper and lower liner plates 3.
(1) First, an outer planar liner plate 1A ′ with a ring piece in which a ring piece 11a is bolted to the circumferential flange 3a at the upper end of the outer planar liner plate 1 is used. The first stage cylindrical retaining wall 13 (13 ₁ ) is assembled on the ground surface of the shaft excavation site by bolting the outer planar liner plate 1A ′ with the ring piece in the circumferential direction.
The earth retaining wall 13 is composed of a ring piece 11a on both or one of the upper and lower circumferential flanges 3a (only the upper end in FIG. 13 (a)) of the liner plate cylinder 12 (12 ₁ ). The connection ring 11 (11 ₁ ) is connected by bolts.

(2) Drilling machine, to form a hole 10 of appropriate depth drilled inside the earth retaining wall 13 ₁ (FIG. 13 (b)).
(3) construction machinery and hydraulic mechanism such as press-fitting the first stage of the earth retaining wall 13 ₁ downhole (FIG. 13 (c)). In this case, the connecting ring 11 ₁ of the earth retaining wall 13 ₁ is pressed so that the above ground location.
(4) bolts connecting the second stage Retaining wall 13 ₂ on the press-fitting the said first stage of earth retaining wall 13 _1.
The Retaining wall 13 ₂ of the second stage, using the upper and lower ring Katazuki outer surface shaped liner plate 1A on both the upper and lower circumferential flange 3a of the outer surface shape liner plate 1 previously bolted to ring piece 11a.
The upper and lower ring Katazuki outer surface shaped liner plate 1A, a bolt connected to the top of the earth retaining wall 13 ₁ of the first stage, and then bolted to the upper and lower ring Katazuki outer surface shaped liner plate 1A between the circumferential direction, 2-stage soil assembling a retaining wall 13 ₂ (FIG. 13 (d)).
(5) Excavation is further deepened by an excavating machine (FIG. 13 (e)).
(6) The two-tiered retaining wall bodies 13 ₁ and 13 ₂ are press-fitted into the excavation hole by a construction machine, a hydraulic mechanism, or the like (FIG. 13 (f)).
Hereinafter, the assembling, hole excavation, and press-fitting operations of the retaining wall body 13 of the above (4) to (6) are repeated to construct a shaft retaining wall with a predetermined depth.
The uppermost retaining wall 13 may have the connecting ring 11 only at the lower end of the liner plate cylinder 12.
The connecting ring 11 is preferably press-fitted after a planar member that covers the opening is attached.

The details of the work in the above-mentioned shaft retaining wall construction work will be described.
In the present invention, the construction work of the shaft retaining wall is performed without a person entering the mine. Therefore, the bolt connection between the liner plates 3 is also performed from the outside of the arc of the liner plate (outside of the curve).
As described above, in the embodiment, in the state of the outer planar liner plate 1A (1A ′) with the ring pieces in which the ring pieces 11a are attached to the respective outer planar liner plates 1, the outer planar liner plates 1 are arranged in the circumferential direction. Although the bolts are connected, the ring pieces 11a do not necessarily have to be connected in the circumferential direction.
The operation of simply assembling the liner plate cylinder 12 by bolting the outer planar liner plates 1 in the circumferential direction will be described as follows.
When the outer side liner plates 1 are connected to each other in the circumferential direction, as shown in FIG. 14, the axial flange 3b on the opposite side to the planar member of one outer side liner plate 1 (left side in the figure), The other side (right side in the figure) of the outer planar liner plate 1 from which the planar member 2 has been removed is brought into contact with the axial flange 3b on the planar member 2 side, and the opening from which the planar member 2 has been removed (the presence of the planar member 2). The bolt 16 is inserted into the bolt hole 3d from the portion 15 and is screwed into the nut 9 welded and fixed to the inner surface of the bolt hole position of the axial flange 3b of the left outer surface liner plate 1 to be connected by fastening. To do.
After the three bolts of the axial flanges 3b are connected, the removed planar member 2 is attached to the opening 15 of the right outer planar liner plate 1 in the illustrated example.
In this case, from the state of FIG. 4 (a) and FIG. 5 (a), the planar member 2 is applied to the opening 15 in a state slightly to the right as shown in FIG. 4 (b) and FIG. 4 (c) and FIG. 5 (c), the planar member 2 is slid leftward in the same figure. Thereby, the planar member 2 closes the opening 15 of the outer planar liner plate 1 and at the same time, the mounted portion 7 (hook portion) is positioned at the other small size portion 5b on the other side of the planar member mounting portion 5 (notch). The planar member 2 is attached to the liner plate 3.
As described above, in the embodiment, the liner plate cylindrical body 12 is assembled in the state of the outer planar liner plate 1A (1A ′) with the ring pieces in which the ring pieces 11a are attached to the respective outer planar liner plates 1. If it exists, it is good also to perform the bolt connection of the circumferential direction of the ring pieces 11a.

  The operation of bolting the ring pieces 11a to the upper and lower circumferential flanges 3a of the individual outer planar liner plates 1 is the same as the bolt connection between the circumferential flanges 3a of the upper and lower liner plates 3 as described above. The bolt hole 3c of the circumferential flange 3a of the liner plate 3 and the bolt hole of the flange portion of the ring-shaped ring piece 11a having a groove-shaped cross section are connected by a bolt 17 (see FIG. 13 (h)).

Thus, the outer surface liner plates 1 (outer surface liner plates with ring pieces 1A (1A ')) are connected in the circumferential direction, and the subsequent outer surface liner plates 1 are sequentially connected in the circumferential direction to form a cylinder. In this case, the liner plate cylindrical body 12 and the connecting ring 11 are formed at the same time to form a one-stage earth retaining wall body 13.
In this embodiment, as described above, since the bolt hole 3d of the axial flange 3b is provided outside the curve of the corrugated steel sheet, a person does not enter the liner plate cylindrical body 12 (the retaining wall body 13). The liner plate cylinder 12 can be easily assembled.
In the case where a working space can be secured and a person can enter and assemble inside the liner plate cylindrical body 12, even in the case of a standard liner plate in which the bolt hole 3d of the axial flange 3b of the liner plate 3 is inside. It is possible to perform the bolt connection in the circumferential direction between the outer planar liner plates by hand or using some tool.

When the upper retaining wall body 13 is bolted on the retaining wall body 13, a groove shape that is open to the outside at the lower end of the upper retaining wall body 13 and the upper end of the lower retaining wall body 13, respectively. Since there is the ring piece 11a in cross section, the upper and lower earth retaining wall bodies 13 can be bolted together by bolting the flange portions of the upper and lower ring pieces 11a from the outside of the earth retaining wall body 13.
In this case, the bolt connection between the axial flanges 3b of the adjacent outer planar liner plates 1 may be performed after the bolt coupling between the upper and lower outer planar liner plates 1A (1A ').

7 to 9 show a planar member 22 of another embodiment.
This planar member 22 has a corrugated shape of the liner plate 3 and a portion on the planar member 22 side of the leading planar member 6 (the left end side portion in FIG. 6 and the like) on one edge of the leading planar member 6 side. It is the structure which provided the insertion part 22a inserted in a trough part.
When the planar member 22 is attached from the state shown in FIGS. 8 (a) and 9 (a) with the planar member 22 removed from the outer side surface liner plate 1, the insertion portion 22a is as shown by a bent arrow in FIG. Are fed toward the gap between the corrugated valleys of the leading surface member 6 and the liner plate 3 and inserted slightly into the gap as shown in FIGS. And slide leftward as shown in FIGS. 8 (c) and 9 (c). As a result, the planar member 22 closes the opening 15 of the outer planar liner plate 1, and at the same time, the mounted portion 7 (hook portion) is positioned at the other side small size portion 5 b of the planar member mounting portion 5 (notch). The planar member 22 is attached to the liner plate 3.
The insertion portion 22a may be inserted between the portion on the planar member 22 side and the outside of the liner plate 3, and is not limited to the wave-shaped valley portion, and may be inserted between the wave-shaped peak portion. If it is possible.

FIG. 10 shows another embodiment of the planar member, particularly the attached portion (hook portion).
10A and 10B, the upper and lower mounted portions in the planar member 32 are not the folded hook portions described above, but the mounted portions 7 ′ (hook portions) bent in a step shape without being folded back. It is.
In this case, as shown in FIG. 10C, the planar member mounting portion 5 '(notch) on the liner plate 3 side is such that the one-side large size portion 5a in the lateral direction is liner than the other-side small size portion 5b. The plate extends to the upper and lower end sides (upper side in the figure), and the height positions of the upper and lower central sides (lower side in the figure) are aligned.

  FIG. 10 (d) shows still another embodiment of the mounted portion (hook portion) of the planar member, and the upper side of the planar member 42 is not folded back as in FIG. 10 (a). The attached portion 7 ′ (hook portion) is bent in a step shape, and the lower attached portion is the attached portion 7 that is folded back in the same manner as the attached portion 7 in FIG. 3.

FIG. 11 shows still another embodiment of the attachment portion of the planar member.
(A) is a front view of the vicinity of the planar member mounting portion 55 on the upper side of the liner plate, (b) is a front view of the planar member, (c) is the left side view, (d) is the plan view, (B '), (c'), and (d ') are enlarged views of (b), (c), and (d), respectively.
In this embodiment, as the planar member mounting portions 55 provided on the upper and lower portions of the liner plate 3, the upper and lower flat portions 3e directly connected to the upper and lower circumferential flanges 3a of the liner plate 3 are arranged on one side large size portions that are circular notches. A keyhole-shaped notch is formed having 55a and the other side small size portion 55b which is a long and narrow notch.
On the other hand, at the upper and lower positions inside the planar member 52, there is a neck portion as a mounted portion 57 detachably engaged with the planar member mounting portion 55 which is the keyhole-shaped notch at the upper and lower positions of the liner plate 3. Protrusions with
Then, the attached portion 57 (protruding portion having a constriction) of the planar member 52 is removed from the one-side large size portion 55a (circular notch) of the planar member attaching portion 55 (keyhole-shaped notch) of the liner plate 3. The planar member 52 is attached to the liner plate 3 by being inserted and slid laterally and moved to the position of the other side small size portion 55b (elongated notch).

In the above-described embodiment, the front surface member 6 is fixed to the liner plate 3 by welding or an adhesive, but may be detachable. In this case, the entire wavy portion of the liner plate is covered with two detachable planar members.
Further, the width of the detachable planar member in the present invention is not particularly limited. There may not be the tipping planar member 6 and it may be of a size that covers the entire corrugated portion of the liner plate with one detachable planar member.
Further, as the planar member mounting portions provided at the upper and lower positions of the liner plate, the planar member mounting portions 5 and 55 are notched in the embodiment, but the planar member mounting portions are not necessarily limited to the notches. What is necessary is just to be able to engage a to-be-attached part by the relationship with the to-be-attached part provided in the planar member side.

DESCRIPTION OF SYMBOLS 1 Outer side surface liner plate 1A, 1A 'Outer side surface liner plate with a ring piece 2, 22, 32, 42, 52 Planar member 22a Insert part 3 Liner plate 3a Circumferential flange 3b Axial flange 3c (of a circumferential flange) Bolt hole 3d (Axial flange) Bolt hole 3e Flat part 5, 5 'Planar member mounting part (notch)
5a One side large size part 5b The other side small size part 6 Tip surface member 7, 7 'Mounted part (hook part)
9 Nut 10 Excavation hole 11 Connection ring 11a Ring piece 12 Liner plate cylindrical body 13 (13 ₁ , 13 ₂ ) Earth retaining wall body 15 Opening 16 Bolt 17 Bolt 55 Planar member mounting part (key hole-shaped notch)
55a Large size part on one side (circular notch)
55b Small size part on the other side (elongated notch)
57 Mounted parts (protrusions with necks)

Claims (7)

An outer planar liner plate comprising an arc-shaped liner plate and a planar member attached outside the arc of the liner plate,
The liner plate has a planar member mounting portion on the outer vertical position thereof,
The planar member has an axial length L that covers at least the corrugated portion of the liner plate and a circumferential length M that covers a part or all of the outer circumferential direction of the liner plate. 2. An outer planar liner plate comprising: a mounted portion that is detachably engaged with the planar member mounting portion in the vertical position at an inner vertical position.   A front surface member having an axial length that covers at least the corrugated portion of the liner plate and a circumferential length shorter than the circumferential length of the liner plate is attached in advance to the outside of the liner plate, and the front surface member The outer planar liner plate according to claim 1, wherein the planar member is attached to an opening between one end of the liner plate and an axial flange of the liner plate.   The said planar member provided the insertion part inserted between the said one end side part of the said leading planar member and the outer side of a liner plate in the one side edge part by the side of the said leading planar member. Item 3. The outer planar liner plate according to Item 2.   The planar member mounting portion at the upper and lower positions of the liner plate is a notch of a small size that is horizontally long in the circumferential direction and one side portion in the horizontal direction is long in the vertical direction, and the other side portion is short in the vertical direction. The mounting portion of the planar member is a protruding portion that can be inserted into and engaged with the notch, and the protruding portion of the planar member is large on one side of the notch of the planar member mounting portion of the liner plate. The outer planar liner according to any one of claims 1 to 3, wherein the planar member is attached to the liner plate in the other small size portion by inserting from the size portion and sliding in the lateral direction. plate.   The two upper and lower cutouts of the liner plate are such that the one side large size portion in the lateral direction extends to the upper and lower end sides of the liner plate from the other side small size portion, and the height positions of the upper and lower center sides of both are aligned. 5. The outer planar liner plate according to claim 4, wherein the outer planar liner plate has a generally vertically symmetrical shape.   The two upper and lower cutouts of the liner plate are such that the one side large size portion in the lateral direction extends to the center side above and below the other side small size portion, and the height positions on both upper and lower ends are aligned. 5. The outer planar liner plate according to claim 4, wherein the outer planar liner plate has a generally vertically symmetrical shape.   In the two upper and lower cutouts of the liner plate, the large size portion on one side in the horizontal direction extends to one of the upper side or the lower side of the liner plate and the other side on the lower side or the upper side is aligned. 5. The outer planar liner plate according to claim 4, wherein:

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