JP4450862B1 - Folding structure of bag - Google Patents

Abstract

[PROBLEMS] To provide a metal sheet that can be constructed with a smaller hole diameter than that of the prior art, and that is not subjected to excessive stress when a fluid is supplied to the inside of the bag to inflate it. Providing a bag that is uniformly inflated and does not deform entirely.
Metal sheets (11) folded in each of a plurality (L1 to L4) of regions are laminated in a radial direction (R), and the radial direction (R) outermost layer in one region and a region adjacent thereto is laminated. The outer portions (211 and 311) are connected by an L-shaped portion (J23), and the radially innermost portions (11i and 21i) in the other region adjacent to the one region are folds (C12 ).
[Selection] Figure 1

Description

  The present invention relates to a folding structure of an inflatable bag that is formed of a folded metal sheet like a bag in an underground anchor, for example.

An inflatable bag body made of a folded metal sheet is used as a bag body in an underground anchor, for example (see Patent Document 1).
An example of such a conventional bag body will be described with reference to FIGS.

In FIG. 10, the bag body 100 </ b> J according to the prior art is laminated with the metal sheet 11 folded.
Sockets 16 and 17 are provided on the top portion 20 of the bag body and the bottom portion 21 of the bag body. The sockets 16 and 17 include sleeves 18 and 19, flat plate portions 20 </ b> P and 21 </ b> P, and cylindrical members 22 and 23.
The folded metal sheet 11 is held in a space between the sleeves 18 and 19 and the cylindrical members 22 and 23.
A hollow pipe connecting member 28 is fixed to the top portion 20 of the bag body, and an opening 30 is formed at the center of the flat plate portion 20P of the top portion 20.

As is clear from FIG. 11, a wide space 26 and a narrow space 27 exist between the sleeve 18 and the cylindrical member 22, and both ends of the folded metal sheet 11 (vertical direction in FIG. 11) are It is arranged in a wide space 26.
If a fluid (for example, cement milk) is supplied to the bag body 100J in the contracted state as shown in FIGS. 10 and 11 through the pipe connecting member 28 (FIG. 10) and the opening 30, with pressure applied, The space | interval of the metal sheet 11 folded up increases, and it moves to the code | symbol X direction in FIG. And it will be in the expanded state shown in FIG.

10-12, the code | symbol 32 shows four connection plates, and the connection plate 32 is being fixed to the sleeve 18 and the sleeve 19 by welding, for example in order to connect the sleeve 18 and the sleeve 19. In FIG.
Since the connection plate 32 is fixed to the sleeves 18 and 19, even if the fluid is supplied to the bag and the metal sheet 11 expands in the radial direction as shown in FIG. Direction) Both end portions are prevented from coming out of the sockets 16 and 17.

  According to the related art, for example, when used for a bag body of an underground anchor, the bag body can be inserted even when it is a boring hole having a small cross-sectional area when contracted. Then, when the contracted bag is inserted to a predetermined position, a fluid such as cement milk may be supplied into the bag to inflate it.

Here, in the bag body shown in FIGS. 10 to 12, both end portions (vertical direction in FIG. 10) of the folded metal sheet 11 are arranged in the wide space 26 and arranged in the narrow space 27. Not.
Therefore, the bag body shown in FIGS. 10 to 12 inflates only in the left-right direction in FIG. 11 and does not inflate in the up-down direction in FIG.

However, as shown in FIG. 13, the metal sheet 11 folded not only in the horizontal direction of FIG. 13 (or FIG. 11) but also in the vertical direction can be arranged. If comprised in that way, a bag can be expanded about the up-down direction and the left-right direction of FIG.
In the example of FIG. 13, in the folded metal sheet 11, the direction in which each extends is substantially the radial direction (the direction of arrow R in FIG. 1), and the direction in which the metal sheets 11 are laminated (overlapping). Is the circumferential direction (the direction of arrow C in FIG. 1). And the adjacent area | region (for example, area | region L1 and L2) of the folded metal sheet 11 has connected the edge part of the inner side of the adjacent plate-shaped member through the connection member JA.

However, in the prior art shown in FIGS. 10 to 13, particularly when the metal sheet 11 is folded as shown in FIG. 13, a fluid (for example, cement milk or the like) is supplied into the bag body to expand. When performing, there exists a case where the metal sheet 11 does not expand uniformly. That is, when the metal sheet 11 is folded as shown in FIG. 13, when a fluid (eg, cement milk) is supplied into the bag body and expanded as shown in FIG. The swelled metal sheet 11 is so-called “wrinkled” or “cracked” at its bent portion.
Then, due to the fact that the metal sheet 11 does not expand uniformly, “wrinkles” or “cracks” occur on the surface of the expanded bag body, and a part of the metal sheet 11 is bent, or so-called “sagging” occurs. This occurs in the connection plate 32. As a result, there is a problem that the entire bag body is deformed.

  Moreover, in the bag body 100J of the prior art shown in FIGS. 10-12, it expand | swells only about the left-right direction in FIG. 11, and does not expand about the up-down direction in FIG. Therefore, in the vertical direction in FIG. 11, it is necessary to increase the inner diameter (hole diameter) of the boring hole into which the bag body 100J is inserted, so that the cost for boring hole is increased, and There is a problem that the noise at the time of driving the bag body 100J increases.

European Patent Application No. 112316

 The present invention has been proposed in view of the above-described problems of the prior art, and can be constructed with a smaller drilling diameter than the prior art. An object of the present invention is to provide a bag folding structure in which a metal sheet is uniformly expanded without being subjected to excessive stress constituting the body, and the whole body is not deformed.

  According to the present invention, each of the first, second, third, and fourth regions that have a rectangular space (100I) inside and that are four regions outside each side of the rectangular space (100I). In the folded structure of the bag body composed of the metal sheet (11) composed of the plate-like portions stacked in a state of being folded in the regions (L1, L2, L3, L4), the outermost portion in the first region (L1) The plate-like portion (111), which is a metal sheet, is connected to the innermost plate-like portion (11i) of the first region (L1) via the plate-like portion of the metal sheet that is sequentially folded inward. The innermost plate-like portion (11i) of the first region (L1) is connected to the innermost plate-like portion (21i) of the second region (L2) by the first fold (C12). The innermost plate-like portion (21i) is sequentially folded outward to be folded into a metal sheet. The plate-like portion (211) outside the second region (L2) is connected to the plate-like portion (211) outside the second region (L2) via the plate-like portion of the second region (L2). ) Is connected to the first straight portion (j2o) along the side surface of the second region (L2), and the first straight portion (j2o) is connected to the third region via the first bent portion (C23). (L3) is connected to the second straight line portion (j3o) along the side surface, and the second straight line portion (j3o) is connected to the outermost plate portion (311) of the third region (L3). The outermost plate-like portion (311) of the third region (L3) is bent inward and folded inward to the innermost portion of the third region (L3). Is connected to the plate-like portion (31i) of the third region (L3) and the innermost plate-like portion (31i) of the third region (L3) is the innermost portion of the fourth region (L4). The plate-like portion (41i) on the side is connected to the second fold line (C34), and the innermost plate-like portion (41i) in the fourth region (L4) is sequentially folded outward and folded. It is connected to the outer plate-like portion (411) of the fourth region (L4) through the metal sheet, and the end portion (40h) of the outer plate-like portion (411) of the fourth region (L4). 4 is connected to the third straight portion (j4o) along the side surface of the region (L4), and the third straight portion (j4o) is connected to the first region (L1) via the second bent portion (J41). The fourth straight line portion (j1o) is connected to the end portion (10h) of the outermost plate-like portion (111) of the first region (L1). ).

According to the present invention having the above-described configuration, the pressure of the fluid supplied to the inside of the bag body (100) acts uniformly on the internal space of the bag body (100), but the region (L1 to L4) The portions (11i and 21i and 31i and 41i) and the folds (C12 and C34) of the innermost metal sheet (11) in the radial direction do not vary even when the fluid pressure acts.
On the other hand, between the L-shaped portion and the metal sheet (11) folded in each region (between 2ob and 3ob in FIG. 1, that is, J23 between L2 and L3, and between 4ob and 1ob, J41 between L4 and L1: In the case of FIG. 2, between 2ob and 3ob, ie, J23 between L2 and L3, and between 4ob and 1ob, ie, J41 between L4 and L1, The fluid enters and acts on its pressure.
As a result, each of the folded and laminated metal sheets (11) expands from the radially outer portion and moves outward in the radial direction, and thereafter the radially inner portion sequentially expands (see FIG. 7). ). Therefore, according to the present invention, at the time of expansion, “wrinkles” and “cracks” on the surface of the bag body, bending at a part of the metal sheet (11), “sag” at the connection plate (32), deformation of the entire bag body. Will not occur.

Further, according to the present invention described above, at the time of expansion, the radially outermost metal sheet portions (111 in FIG. 9) are also present at both ends (vertical ends in FIG. 10) of the metal sheet (11). Then, it slides with respect to the adjacent inner portion (112 in FIG. 9), and then slides sequentially toward the radially innermost portion (11i in FIG. 9) (see FIG. 9).
The fact that both end portions of the metal sheet (11) are displaced in this manner also means that, in the present invention, when the bag body (100) is inflated, “wrinkles” and “cracks” on the surface of the bag body, and part of the metal sheet (11). This is a factor that does not cause bending of the connection plate (32), "sag" in the connection plate (32), and deformation of the entire bag (100).

  In the present invention, the folded metal sheet (11) is sandwiched in the space between the sleeve (18, 19) and the cylindrical member (22, 23), and the sleeve (18, 19) and the cylindrical member (22, 23) If the surface of the metal sheet (11) sandwiched between the space between the sleeve (23) and the surface of the metal sheet (11) is immersed in a water-stopping material (for example, asphalt bron), the sleeve (18, 19) and the cylindrical member (22, 23) Since the metal sheet (11) folded into a plurality of layers exists in the space between the two, the water-stopping property is ensured by the layer of the water-stopping material formed on the metal sheet (11) of each layer.

In contrast, when a fluid (for example, cement milk) is supplied and the bag is inflated, as described above, from the radially outermost metal sheet portion (111 in FIG. 9), the adjacent radially inner Since the metal sheet slides sequentially, when the metal sheet of the main body swells to a certain extent and becomes a saddle shape, the number of stacked metal sheets (11) decreases. For example, one metal sheet (11) becomes a sleeve (18 19) and the cylindrical member (22, 23).
As a result of the reduction in the number of laminated metal sheets (11), the water stoppage in the space between the sleeves (18, 19) and the cylindrical members (22, 23) is reduced, and the cement milk becomes a bag (100). It is possible to make it leak to the outside (so-called leaked state).
And since the cement milk leaks out of the bag body (100), the expanded bag body (100) can be integrated with the ground in the ground.
Here, the bag body (100) is not completely expanded, and the number of stacked metal sheets (11) in the space between the sleeve (18, 19) and the cylindrical member (22, 23) is relatively large. In such a case, the water stoppage is ensured by the layer of the water stop material formed on the multi-layered metal sheet (11), so that the cement milk does not leak out of the bag body (100). In other words, in the present invention, the cement milk leaks to the outside of the bag body (100), and the effect of integrating the bag body (100) with the ground is exhibited to some extent. It is after the expansion (after the time of becoming a bowl).

In addition to this, the present invention expands not only in the horizontal direction in FIG. 11 but also in the vertical direction in FIG. Therefore, compared with the case of the prior art (100J) which expands only in the left-right direction in FIG.
Therefore, according to the present invention, the inner diameter (hole diameter) of the boring hole into which the bag body (100) is inserted can be reduced, and the cost for boring hole can be saved. In addition, the noise when driving the bag (100) can be reduced.

It is a figure which shows the outline | summary of embodiment of this invention. It is a figure which shows the outline | summary of the modification of embodiment. It is a figure which shows the outline | summary of a 1st comparative example. It is a figure which shows the outline | summary of the 2nd comparative example. It is a figure which shows the outline | summary of the 3rd comparative example. It is a figure explaining the effect | action of embodiment of this invention, and is a figure which shows typically the state by which the fluid was supplied inside the bag body. It is a figure which shows typically the state in which the fluid was further supplied from the state shown in FIG. It is a figure which shows typically the state of the metal sheet edge part at the time of the fluid being supplied into the bag body. It is the YY sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows the state which the conventional bag body currently used as a bag body of an underground anchor contracted. It is the XX sectional view taken on the line of FIG. It is a front view which shows the state which the bag body of FIG. 10, FIG. 11 expanded. It is a figure which shows the outline | summary of the prior art from which the aspect which folds a metal sheet differs from FIGS.

Embodiments of the present invention will be described below with reference to FIGS.
1 to 9, members similar to those described in FIGS. 10 to 13 are denoted by the same reference numerals. In the illustrated embodiment, configurations other than those described below are the same as those described in FIGS.

FIG. 1 shows an overview of an embodiment of the present invention.
In FIG. 1, a bag body generally indicated by reference numeral 100 has four regions L1 to L4 in which metal sheets 11 are stacked in a folded state. In the four regions L1 to L4, the metal sheets 11 laminated in a folded state each extend in the circumferential direction (the direction of arrow C in FIG. 1). In other words, the metal sheets 11 folded in each of the regions L1 to L4 are stacked in the radial direction (arrow R direction).

The regions L1 to L4 where the metal sheets 11 are folded and stacked are arranged so as to extend in the vertical direction and the horizontal direction in FIG.
Here, when the metal sheet 11 folded and laminated in the regions L1 to L4 is unfolded, it becomes one sheet-like member.
When a fluid (for example, cement milk) is filled in the internal space 100I of the metal sheet 11, the metal sheet 11 expands into a substantially cylindrical shape.

The region L <b> 1 and the region L <b> 3 are disposed so as to face the virtual center point O of the bag body 100. Further, the region L2 and the region L4 are arranged so as to face the center point O (virtual) of the bag body 100.
The folding direction of the plate-like portions of the regions L1 to L4, that is, the stacking direction (the direction in which the metal sheets 11 overlap) is the radial direction (the direction of arrow R in FIG. 1). And the laminated | stacked metal sheet 11 is extended in the circumferential direction (arrow C direction in FIG. 1).
In FIG. 1, regions L1 to L4 are arranged in the order of L1, L2, L3, and L4 in the clockwise direction in the circumferential direction C when the region L1 is the starting point.

In the region L1, the plate-like portion 111 is bent by the bent portion 112b and is connected to the plate-like portion 112. The plate-like portion 112 is bent at the bent portion 123 b and connected to the plate-like portion 113. The plate-like portion 113 is bent at the bent portion 134 b and connected to the plate-like portion 114. Thereafter, similarly, the innermost plate-like portion 11i is bent.
In the region L2, the plate-like portion 211 is bent by the bent portion 212b and is connected to the plate-like portion 212. The plate-like portion 212 is bent at the bent portion 223 b and connected to the plate-like portion 213. The plate-like portion 213 is bent at the bent portion 234 b and connected to the plate-like portion 214. Thereafter, similarly, the innermost plate-like portion 21i is bent.

In the region L3, the plate-like portion 311 is bent by the bent portion 312b and is connected to the plate-like portion 312. The plate-like part 312 is bent at the bent part 323 b and connected to the plate-like part 313. The plate-like portion 313 is bent at the bent portion 334 b and connected to the plate-like portion 314. Thereafter, similarly, the innermost plate-like portion 31i is bent.
In the region L4, the plate-like portion 411 is bent by the bent portion 412b, and is connected to the plate-like portion 412. The plate-like portion 412 is bent at the bent portion 423 b and connected to the plate-like portion 413. The plate-like portion 413 is bent at the bent portion 434 b and connected to the plate-like portion 414. Similarly, the innermost plate-like portion 41i is bent.

The innermost plate-like portion 11i in the region L1 and the innermost plate-like portion 21i in the region L2 are connected by a crease C12.
An end portion 2ob of the outermost plate-like portion 211 in the region L2 and an end portion 3ob of the outermost plate-like portion 311 in the region L3 are connected by an L-shaped portion J23.
The L-shaped portion J23 includes a straight line portion j2o on the region L2 side, a straight line portion j3o on the region L3 side, and a bent portion c23 that connects the straight line portion j2o and the straight line portion j3o.
The straight line portion j2o is disposed along the right bent portion 223b and the like of the region L2 in FIG. 1, and the straight portion j3o is disposed along the upper bent portion 323b and the like of the region L3 in FIG.

The innermost plate portion 31i in the region L3 and the innermost plate portion 41i in the region L4 are connected by a crease C34.
An end portion 4ob of the outermost plate-like portion 411 in the region L4 and an end portion 1ob of the outermost plate-like portion 11 in the region L1 are connected by an L-shaped portion J41.
The L-shaped portion J41 includes a straight portion j4o on the region L4 side, a straight portion j1o on the region L1 side, and a bent portion c41 that connects the straight portion j4o and the straight portion j1o.
The straight line portion j4o is disposed along the left bent portion 423b and the like of the region L4 in FIG. 1, and the straight portion j1o is disposed along the lower bent portion 123b and the like of the region L1 in FIG. .

The illustrated embodiment configured as described above is clearly different from the prior art shown in FIG.
In FIG. 13, the stacking direction of the folded metal sheets is the circumferential direction (the direction of arrow C in FIG. 1), and adjacent regions (for example, regions L1 and L2 in FIG. 13) are adjacent plate-like members (region L1). The innermost ends of the L2 plate-like member) are connected to each other by the connecting member JA.
On the other hand, in the embodiment shown in FIG. 1, the stacking direction of the folded metal sheets 11 is the radial direction (the direction of arrow R in FIG. 1), and the metal sheets 11 in the adjacent regions are folded as described above. They are connected by C12, C34 or L-shaped parts J23, J41.
In addition, the effect in embodiment shown in FIG. 1 is later mentioned with reference to FIGS.

FIG. 2 shows a modification of the embodiment of FIG.
In FIG. 2, a bag body 100 </ b> A of the first modification is an embodiment in which the front and back are reversed with respect to the bag body 100 of the embodiment. (Alternatively, this is an embodiment rotated 90 °.)
The configuration and operational effects of the modified example of FIG. 2 are the same as those of the embodiment of FIG.

FIG. 3 shows a first comparative example for comparison with the embodiment of FIG.
In FIG. 3, the bag body 1 </ b> C <b> 1 that is the first comparative example has four regions L <b> 1 to L <b> 4 in which the metal sheets 11 are stacked in a folded state, similarly to the bag body 100 according to the embodiment.

However, in the comparative example of FIG. 3, the end portion 1ob of the outermost plate-like portion 111 in the region L1 and the end portion 21ie of the innermost plate-like portion 21i in the region L2 are connected by the plate-like member K12. Has been.
In FIG. 3, the end 31ie of the innermost plate-like portion 31i in the region L3 and the end 4ob of the outermost plate-like portion 411 in the region L4 are connected by a plate-like member K34.
The innermost plate-like portion 41i in the region L4 and the innermost plate-like portion 11i in the region L1 are connected by a connecting portion K41.
In the above points, the comparative example of FIG. 3 is different from the embodiment of FIG.
Note that the end portion 2ob of the outermost plate-like portion 211 in the region L2 and the end portion 3ob of the outermost plate-like portion 311 in the region L3 are connected by an L-shaped portion K23.

FIG. 4 shows a second comparative example for comparison with the embodiment of FIG.
In FIG. 4, the bag 1 </ b> C <b> 2 as the second comparative example also has four regions L <b> 1 to L <b> 4 in which the metal sheets 11 are stacked in a folded state, similarly to the bag 100 according to the embodiment.
However, the comparative example of FIG. 4 is different from the embodiment of FIG. 1 in the following points.

In FIG. 4, the end portion 11ie of the innermost plate-like portion 11i in the region L1 and the end portion 2ob of the outermost plate-like portion 211 in the region L2 are connected by a plate-like member M12.
An end portion 21ie of the innermost plate-like portion 21i in the region L2 and an end portion 3ob of the outermost plate-like portion 311 in the region L3 are connected by a plate-like member M23.
The end portion 31ie of the innermost plate-like portion 31i in the region L3 and the end portion 4ob of the outermost plate-like portion 411 in the region L4 are connected by a plate-like member M34.
The end portion 41ie of the innermost plate-like portion 41i in the region L4 and the end portion 1ob of the outermost plate-like portion 111 in the region L1 are connected by a plate-like member M41.

FIG. 5 shows a third comparative example for comparison with the embodiment of FIG.
The third comparative example (bag body 1C3) in FIG. 5 is configured in the opposite direction to the second comparative example (bag body 1C2) in FIG. In other words, the third comparative example of FIG. 5 is configured upside down with respect to the second comparative example of FIG.

In the applicant's experiment, the first to third comparative examples in FIGS. 3 to 5 did not expand as shown in FIG. 12 when the bag body was filled with water as a fluid.
And in the 1st-3rd comparative example of FIGS. 3-5,
"Wrinkles" and "I" occur on the fluid surface,
A part of the metal sheet 11 that is bent and laminated is bent.
A so-called “sag” occurs in the connection plate 32 (see FIGS. 10 to 12).
The entire bag is deformed,
The problem that occurred.
On the other hand, in the applicant's experiment, even if the bag 100 was filled with water as a fluid in the embodiment of FIGS.

Hereinafter, the reason why the embodiment of FIG. 1 (FIG. 2) has suitably expanded without causing the problems that occurred in the first to third comparative examples will be described with reference to FIGS. 6 to 9. To do. That is, in the following, the effects of the embodiment will be described with reference to FIGS.
6-8, the arrow P has shown that the pressure of the fluid (for example, water) supplied in the bag body 100 is acting.

FIG. 6, which is substantially the same as FIG. 1, shows a state in which a fluid (for example, water in the applicant's experiment) is supplied into the internal space E of the bag body 100.
In the internal space E of the bag body 100, the pressure (arrow P) of the fluid (for example, cement milk) supplied to the space E acts uniformly.
Here, in each of the regions L1 to L4, the portions 11i to 14i of the innermost metal sheet 11 in the radial direction and the folds C12 and C34 are not displaced so much even when fluid pressure acts.

On the other hand, the pressure (arrow P) of the fluid (for example, cement milk) is applied to the boundary portion δ23 between the L-shaped portion J23 and the internal region 100I and the boundary portion δ41 between the L-shaped portion J41 and the internal region 100I. As a result of the action, the bag body 100 according to the embodiment is deformed as shown in FIG.
As shown in FIG. 7, according to the illustrated embodiment, the pressure (arrow P) of the fluid (for example, cement milk) acts on the boundary portions δ23 and δ41 to be folded and laminated. 11 move from the radially outer portion (the plate-like portion 111 in the region L1, 211 in the region L2, the plate-like portion 311 in the region L3, and 411 in the region L4) in the expanding direction (radially outward). . And it moves to the direction (radial direction outer side) in which the bag 100 expands in order from the metal sheet 11 on the radial outer side to the metal sheet 11 on the radial inner side.
As a result, in the bag body 100 according to the embodiment, when the bag body is inflated, “wrinkles” and “cracks” on the surface of the bag body, a part of the metal sheet 11 is bent, and “in the connection plate 32 (see FIGS. 11 and 12)” “Sag”, the deformation of the entire bag does not occur.

On the other hand, in the prior art of FIG. 13 and the first to third comparative examples (1C1 to 1C3) of FIGS. 3 to 5, in all the basins L1 to L4, a radially outer portion (in the region L1, a plate-like portion) 111, in the region L2, 211 in the region L3, 411 in the region L4, and 411 in the region L4), the structure is not guaranteed to move sequentially inward in the radial direction.
Therefore, in the prior art of FIG. 13 and the first to third comparative examples (1C1 to 1C3) of FIGS. 3 to 5, the problem as described above, that is, “wrinkles” and “cracking” on the bag surface, It is estimated that problems such as bending of a part of the metal sheet 11, “sag” in the connection plate 32 (see FIGS. 11 and 12), deformation of the entire bag body, and the like have occurred.

Furthermore, as shown in FIG. 7, when a fluid is supplied through the pipe connecting member 28, the pressure of the fluid (arrow P) is changed to the portion of the metal sheet 11 on the radially outer side (in the region L1, the plate-like portion 111, In the region L2, 211, the plate-like portion 311 in the region L3, and 411 in the region L4) are displaced in the direction in which the bag body 100 expands. For this reason, in FIG. 8, the metal sheet portion 111 on the radially outer side (right side in FIG. 8) is displaced in the direction in which the bag body 100 expands, and the displacement is sequentially shifted radially inward (on the left side in FIG. 8). ) To propagate.
The displacement in the direction in which the bag body 100 expands sequentially from the metal sheet portion 111 on the right side (radially outer side) in FIG. 8 toward the metal sheet portion 11i on the left side (radially inner side) in FIG. 9, as shown in FIG. 9, at both ends of the metal sheet 11 (upper and lower ends in FIG. 10), the radially outermost metal sheet portion 111 is a portion of the other metal sheet. , Slide first. Such slide-like fluctuations sequentially propagate to the radially inner metal sheet portion.
As shown in FIG. 9, the radially innermost portion 11i maintains the vertical state during contraction to the end, but eventually expands.

That is, in the illustrated embodiment, at both ends of the metal sheet 11 (upper and lower ends in FIG. 10), as shown in FIG. 9, the radially outermost metal sheet portions 111 are adjacent inner portions 112. Slid outward in the radial direction (left side in FIG. 9), and such a sliding displacement sequentially propagates toward the radially inner portion 11i.
The both end portions of the metal sheet 11 are displaced as described with reference to FIGS. 8 and 9 (sliding displacement that sequentially propagates toward the radially inner portion 11i). When the bag body 100 is inflated, the surface of the bag body is “wrinkled” or “cracked”, part of the metal sheet 11 is bent, “sag” in the connection plate 32 (see FIGS. 11 and 12), the entire bag body It is estimated that this is a factor that does not cause deformation.

In the illustrated embodiment, although not clearly shown, the metal sheet 11 is disposed between the four-sided rectangular (so-called box-shaped) sleeves 18 and 19 and the cylindrical members 22 and 23 ( The top 20 of the bag 100 and the bottom 21 of the bag 100 are immersed in a dipping tank (not shown) in which asphalt bron dissolved at a predetermined temperature is stored as a liquid phase water-stopping material. Measures to stop water are taken. The immersion time is determined on a case-by-case basis based on the size and structure of the bag.
As a result, in the illustrated embodiment, the metal sheet 11, the sleeves 18 and 19, and the cylindrical members 22 and 23 disposed (clamped) in the space between the sleeves 18 and 19 and the cylindrical members 22 and 23 As a result, a layer of asphalt bron that is a water stop material is formed.
Since the metal sheet 11, the sleeves 18 and 19, and the cylindrical members 22 and 23 are immersed in asphalt bron that is a water-stopping material, in the illustrated embodiment, before the bag body 100 is expanded, the sleeves 18 and 19 and In the space between the cylindrical members 22 and 23, there is a metal sheet 11 folded into a plurality of layers, and each of the metal sheet 100, the sleeves 18 and 19, and the cylindrical members 22 and 23 stacked in a plurality of layers. Due to the asphalt bron layer configured as described above, waterproofing is ensured at the top 20 of the bag 100 and the bottom 21 of the bag.

When cement milk is supplied to the bag body 100 and expanded, as described above with reference to FIGS. 8 and 9, the portion 111 of the radially outermost metal sheet first slides and then is adjacent to the radially inner side. Then, the metal sheet 112 slides and then slides inward in the radial direction, and the metal sheet 11 spreads like a fan.
Then, when the metal sheet expands to some extent and the bag body 100 becomes bowl-shaped, the number of stacked metal sheets 11 decreases, and only one metal sheet 11 (for example, the radially innermost metal sheet portion 11i). Is disposed in a space between the sleeves 18 and 19 and the cylindrical members 22 and 23. Here, asphalt bron is selected as a material capable of following deformation when the metal sheet 11 slides and spreads like a fan.
When the number of stacked metal sheets 11 decreases and only one metal sheet 11 (for example, the radially innermost metal sheet portion 11i) exists, the sleeves 18 and 19 and the cylindrical member 22, The water stoppage in the space between the two is reduced, and the cement milk leaks out of the bag body 100 (so-called leaked state).
When the cement milk leaks out of the bag body 100, the expanded bag body 100 can be integrated with the ground in the ground.

Here, when the bag 100 is not completely inflated and the number of stacked metal sheets 11 in the space between the sleeves 18 and 19 and the cylindrical members 22 and 23 is relatively large, a plurality of layers of metal are used. Since the water-stopping material layer formed on the sheet 11 and the like ensures water-stopping property, the cement milk does not leak out of the bag body 100.
In other words, in the illustrated embodiment, the cement milk leaks to the outside of the bag body 100 and the bag body 100 is integrated with the ground after the bag body 100 expands to some extent (becomes a bowl shape). And after).

In addition, in the illustrated embodiment, not only the horizontal direction in FIG. 11 but also the vertical direction in FIG. 11 expands. Therefore, the cross-sectional area of the bag body at the time of expansion can be made larger than the cross-sectional area of the bag body at the time of contraction, as compared with the prior art that expands only in the left-right direction in FIG.
For this reason, in the illustrated embodiment, the inner diameter (hole diameter) of the boring hole into which the bag body 100 is inserted can be reduced by at least the amount of expansion in the vertical direction in FIG. And the cost for a boring hole drilling can be saved by reducing the internal diameter (drilling hole diameter) of a boring hole. In addition, noise when driving the bag 100 can be reduced.

The illustrated embodiment is merely an example, and is not intended to limit the technical scope of the present invention.
For example, although not shown in the ends of the metal sheet 11 shown in FIG. 9 (both ends in the vertical direction in FIG. 10), the ends are soaked in asphalt bron stock solution, so that the ends are waterproofed. It is preferable.

DESCRIPTION OF SYMBOLS 11 ... Metal sheet 16, 17 ... Socket 18, 19 ... Sleeve 20 ... Top part 21 ... Bottom part 20P, 21P ... Flat plate part 22, 23 ... Cylindrical member 26 ... · Wide space 28 ··· pipe connection member 32 ··· connection plates 111 to 11i ··· plate-like portions 211 to 21i ··· plate-like portions 311 to 31i ··· plate-like portions 411 to 41i ··· plates C12 ... crease C34 ... crease J23 ... L-shaped part J41 ... L-shaped part

Claims (1)

It has a rectangular space (100I) inside, and the first, second, third, and fourth regions (L1, L2,...) That are four regions outside each side of the rectangular space (100I). L3, L4) In the folded structure of the bag body made of the metal sheet (11) composed of the plate-like portions stacked in a folded state, the plate shape which is the outermost metal sheet in the first region (L1) The portion (111) is connected to the innermost plate-like portion (11i) of the first region (L1) via the plate-like portion of the metal sheet that is sequentially folded and folded inward, and the first region The innermost plate portion (11i) of (L1) is connected to the innermost plate portion (21i) of the second region (L2) by the first fold (C12), The plate-like portion (21i) is sequentially folded outward and folded through the plate-like portion of the metal sheet. It is connected to the plate-like portion (211) outside the second region (L2), and the plate-like portion (211) outside the second region (L2) is the second region (20h) at the second region ( L2) is connected to the first straight portion (j2o) along the side surface, and the first straight portion (j2o) is along the side surface of the third region (L3) via the first bent portion (C23). The second straight line portion (j3o) is connected to the second straight line portion (j3o), which is connected to the outermost plate portion (311) of the third region (L3). The outermost plate-like portion (311) of L3) is bent inward in order, and the innermost plate-like portion (31i) of the third region (L3) through the plate-like portion of the metal sheet folded. The innermost plate portion (31i) of the third region (L3) is connected to the innermost plate portion (4 of the fourth region (L4)). i) and the second fold line (C34), and the innermost plate-like portion (41i) of the fourth region (L4) is sequentially bent outward and folded through the metal sheet. The fourth region (L4) is connected to the outer plate-like portion (411) of the fourth region (L4) and the end portion (40h) of the outer plate-like portion (411) of the fourth region (L4). The third straight line portion (j4o) along the side surface of the first region (j4o) is connected to the fourth straight line portion along the side surface of the first region (L1) via the second bent portion (J41). The fourth straight line portion (j1o) is connected to the end portion (10h) of the outermost plate portion (111) of the first region (L1). The bag folding structure characterized by the above.

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