JP7591438B2 - Earth retaining material - Google Patents

Description

The present invention relates to an earth retaining member.

For example, in construction environments where heavy machinery cannot be used, such as mountainous regions, liner plates are used as retaining members when constructing landslide prevention piles, drainage wells, or shafts for tunneling. Liner plates are structural members made of thin steel plates corrugated and equipped with flanges on all four sides. In addition to being lightweight and portable, they are highly easy to construct because assembly can be completed from the inside of the retaining wall. Liner plates are also used in deep foundation construction methods for building foundations for bridge piers, abutments, or steel towers. Examples of such conventional technologies related to liner plates are described in, for example, Patent Document 1, Patent Document 2, and Patent Document 3.

Japanese Patent Application Publication No. 4-112987 Patent No. 5486931 Utility Model Registration No. 3158383

In conventional deep foundation construction methods such as those described above, the liner plate is not expected to function as a foundation structure, and the reinforcing bars constructed inside the shaft and the concrete poured into it form the foundation structure. However, if the liner plate could replace the function of the reinforcing bars that run circumferentially around the shaft, for example, the mounting materials and reinforcing bar arrangement process for the reinforcing bars could be eliminated, which would reduce costs and shorten the construction period.

However, as mentioned above, conventional liner plates are not expected to function as foundation structures, so if an attempt is made to use a liner plate to restrain the concrete around the main reinforcing bars like a tie bar when an earthquake force is applied, a large tensile force will act on the joints between the axial flanges of the liner plate, causing the flanges to deform and resulting in an inability to adequately restrain the concrete around the main reinforcing bars, which could result in shear failure of the foundation structure.

The present invention aims to provide an earth retaining member that can prevent deformation of the flange due to tensile forces acting in the circumferential direction of the wall body.

[1] An earth-retaining member which is combined with a wall body in the circumferential and axial directions, the earth-retaining member comprising: an axial flange extending axially at a circumferential end; a main body portion having a corrugated cross-section which extends circumferentially and abuts against the axial flange; a first joint formed on the axial flange at a valley portion of the corrugated cross-section when viewed from the inside of the wall body and which joins the axial flange to the axial flange of an adjacent earth-retaining member; and a second joint formed at a location different from the first joint and which joins the axial flange to the axial flange of the adjacent earth-retaining member.
[2] The retaining member described in [1], in which a tension member is joined to the second joint, the tension member being formed in the main body at the peak portion of the corrugated cross section when viewed from the inside of the wall and being erected across the axial flange to a joint with another retaining member.
[3] The retaining member described in [2], wherein the second joints formed in each of the multiple peak portions of the corrugated cross section are formed at different positions in the circumferential direction.
[4] The retaining member described in [1], wherein the second joint is formed in the axial flange at the valley portion of the corrugated cross section when viewed from the outside of the wall body.
[5] An earth retaining member as described in [4], in which an access hole to the second joint is formed in the main body at the peak portion of the corrugated cross section when viewed from the inside of the wall.
[6] An earth retaining member as described in [5], in which the access holes formed in each of the multiple peak portions of the corrugated cross section are formed at staggered positions in the circumferential direction.
[7] The retaining member described in [1], wherein the axial flange extends further inward than the peak portion of the corrugated cross section when viewed from the inside of the wall, and the second joint is formed at the portion where the axial flange extends inwardly of the wall.
[8] A retaining member as described in any one of [4] to [7], wherein the second joint is joined by overlapping the axial flange with the axial flange of another retaining member and bolting, tightening with a fastening means, or welding.
[9] An earth retaining member described in any one of [1] to [8], further comprising a reinforcing plate in surface contact with the axial flange at the first joint.
[10] The retaining member described in [9], wherein the sum of the plate thickness of the axial flange and the plate thickness of the reinforcing plate is at least twice the plate thickness of the main body portion.
[11] An earth retaining member described in any one of [1] to [8], wherein the plate thickness of the axial flange is 1.8 times or more the plate thickness of the main body portion.

According to the above configuration, in addition to the first joint that directly joins the axial flanges with the retaining member, a second joint is formed that joins the axial flanges at a location different from the first joint. This distributes stress to each joint even when a large tensile force acts in the circumferential direction of the wall, and prevents deformation of the axial flanges at the first joint.

1 is a cross-sectional view of an underground structure in which an earth retaining member according to an embodiment of the present invention is used. FIG. 2 is a diagram showing the arrangement of reinforcing bars in the example of FIG. 1 . 1 is a diagram showing the configuration of an earth retaining member according to a first embodiment of the present invention; 1 is a diagram showing the configuration of an earth retaining member according to a first embodiment of the present invention; 6 is a diagram showing the configuration of an earth retaining member according to a second embodiment of the present invention; FIG. 6 is a diagram showing the configuration of an earth retaining member according to a second embodiment of the present invention; FIG. A diagram showing the configuration of an earth retaining member according to a third embodiment of the present invention. A diagram showing the configuration of an earth retaining member according to a third embodiment of the present invention. A diagram showing the configuration of an earth retaining member according to a fourth embodiment of the present invention. A diagram showing the configuration of an earth retaining member according to a fourth embodiment of the present invention. A diagram showing the configuration of an earth retaining member according to a fifth embodiment of the present invention. A diagram showing the configuration of an earth retaining member according to a fifth embodiment of the present invention.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that in this specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

Figure 1 is a cross-sectional view of an underground structure in which an earth retaining member according to an embodiment of the present invention is used. The underground structure 1 is a deep foundation, and includes an earth retaining member 4 installed along the wall surface 3W of a vertical shaft 3 formed by excavating the ground 2, concrete 5 filled inside the earth retaining member 4, a filler 6 filled between the earth retaining member 4 and the wall surface 3W of the vertical shaft 3, and a reinforcing bar 7 embedded in the concrete 5. The filler 6 includes, for example, a first filler 6A applied by spraying onto the wall surface 3W of the vertical shaft 3, and a second filler 6B applied by pouring between the first filler 6A and the earth retaining member 4. In another example, the filler 6 may be entirely applied by pouring between the wall surface 3W and the earth retaining member 4. The underground structure 1 may further include a formwork member 8 used when applying the filler 6.

Figure 2 is a diagram showing the arrangement of reinforcing bars in the example of Figure 1. In the illustrated example, reinforcing bars 7 are main bars extending in the axial direction y of the wall body, and tie bars extending in the circumferential direction x of the wall body are not arranged. The function of the tie bars is replaced by the retaining members 4 that constitute the wall body surrounding the reinforcing bars 7. Specifically, in the illustrated example, the retaining members 4 restrain the concrete 5 (see Figure 1) around the reinforcing bars 7 when, for example, an earthquake force acts. The retaining members 4 are combined in the circumferential direction x and the axial direction y of the wall body shown in Figure 2 to form the wall body, but if a large tensile force acts on the joint between the retaining members 4 extending in the axial direction y at the end of the circumferential direction x of the wall body, the axial flanges formed at the end of each retaining member 4 may deform. If deformation occurs, the function of the retaining members 4 to restrain the concrete 5 around the reinforcing bars 7 will not be fully exerted.

In the following, as an embodiment of the present invention, an example of a configuration for preventing deformation of the axial flange of the earth retaining member 4 and fully exerting the function of restraining the concrete 5 around the reinforcing bar 7 when the earth retaining member 4 is placed as a substitute for the tie bars in an underground structure such as that shown in Figures 1 and 2 is described. Note that the cross-sectional shape of the wall is not limited to a circle as in the example shown in Figure 2, and may be, for example, an oval, a rectangle, a horseshoe, etc. Also, the earth retaining member 4 does not necessarily have to replace all of the tie bars, and the earth retaining member 4 and the tie bars may be used in combination. In this case, the amount of tie bars can be reduced by replacing part of the tie bars with the earth retaining member 4, which is advantageous from the standpoint of saving materials and improving workability.

(First embodiment)
3A and 3B are diagrams showing the configuration of the soil retaining member according to the first embodiment of the present invention, and are views taken along the lines A-A and B-B in each diagram. In the illustrated example, the soil retaining member 4 includes an axial flange 41, a main body 42, and a circumferential flange 43, and a bolt joint 44 is formed in the axial flange 41, and a bolt joint 46 is formed in the main body 42. The axial flange 41 is formed at the end of the wall body in the circumferential direction x formed by combining the soil retaining members 4, and extends in the axial direction y of the wall body. The main body 42 has a corrugated cross section extending in the circumferential direction x of the wall body. This corrugated cross section abuts against the axial flange 41 at the end of the wall body in the circumferential direction x. The circumferential flange 43 is formed at the end of the wall body in the axial direction y, and extends in the circumferential direction x of the wall body. The soil retaining member 4 may be formed, for example, by welding an end of a member in which the main body 42 and the circumferential flange 43 are integrated to the axial flange 41, but is not limited to this example.

The above-mentioned retaining member 4 may be, for example, what is called a liner plate, but is not limited to this example, and a similar function can be achieved by any steel member having an axial flange 41 and a main body 42, even if it is not necessarily called a liner plate.

In order to allow the earth retaining member 4 to function effectively as a substitute for the tie bars, the earth retaining member 4 may be made of a higher strength steel material, specifically a steel material with a higher yield point. For example, the entire earth retaining member 4 including the axial flange 41, the main body 42, and the circumferential flange 43 may be made of high strength steel material, or the axial flange 41 may be made of high strength steel material and the main body 42 and the circumferential flange 43 may be made of the same steel material as in the past. As the high strength steel material, specifically, SS400 material, SS490 material, and SS540 material, which have a higher yield point than the currently used SS330 material in general structural rolled steel materials (JIS G3101), can be used. For rolled steel for welded structures (JIS G3106), SM400A, SM400B, SM400C, SM490A, SM490B, SM490C, SM490YA, SM490YB, SM520B, SM520C, and SM570 can be used.

In this embodiment, a bolt joint 44 is formed on the axial flange 41 as a first joint for joining the axial flange 41 of the soil retaining member 4 to the axial flange of another adjacent soil retaining member. The bolt joint 44 is composed of a bolt hole formed in the axial flange 41, a bolt 441 inserted into the bolt hole, and a nut 442 screwed onto the bolt 441. When viewed from the inside of the wall (the front side in FIG. 3A, the right side in FIG. 3B), the bolt joint 44 is formed in the valley of the corrugated cross section of the main body 42. The axial flanges 41 can be joined between the soil retaining member 4 and the adjacent soil retaining member by inserting the bolt 441 into the bolt hole formed in each axial flange 41 from the side of one soil retaining member 4 and screwing the nut 442 onto the bolt 441 on the side of the other soil retaining member.

Furthermore, in this embodiment, a bolt joint 46 capable of joining a tension member 45 is formed as a second joint that joins the axial flange 41 of the retaining member 4 to the axial flange of another adjacent retaining member. The bolt joint 46 includes a bolt hole formed in the main body 42 at the peak portion of the corrugated cross section of the main body 42 when viewed from the inside of the wall, and a one-sided bolt 461 inserted into the bolt hole. By inserting the one-sided bolt 461 into the through hole formed in the tension member 45, the tension member 45 can be joined to the main body 42 of the retaining member 4 from the inside of the wall. The tension member 45 is erected over the axial flange 41 and joined to a bolt joint similarly formed in the main body of another adjacent retaining member.

When the bolt joints 46 are formed at each of the multiple peaks of the corrugated cross section of the main body 42 as in the illustrated example, each bolt joint 46 may be formed at a different position in the circumferential direction x of the wall body. This can minimize the cross-sectional loss of the retaining member 4 caused by forming the bolt holes.

According to the first embodiment of the present invention as described above, in addition to the bolt joints 44 that directly join the axial flanges 41 to each other, the joints between the axial flanges 41 are reinforced by the bolt joints 46 that join the main body parts 42 to each other via the tension members 45. This allows stress to be distributed to each joint when a large tensile force acts in the circumferential direction x of the wall body, and prevents the axial flanges 41 from deforming at the bolt joints 44. Therefore, in this embodiment, deformation of the axial flanges 41 of the retaining member 4 can be prevented, and the function of restraining the concrete 5 around the reinforcing bar 7 can be fully exerted.

In addition, in this embodiment, the shapes of the axial flange 41, main body 42, and circumferential flange 43 in the soil retaining member 4 may be the same as those of conventional soil retaining members, which has the advantage that it can be easily realized by processing the conventional soil retaining member to form bolt holes for the bolt joints 46, for example. Of course, the new soil retaining member used in this embodiment may be manufactured by using high-strength steel as described above.

In addition, in this embodiment, the process of inserting the one-sided bolt 461 into the bolt hole at the bolt joint 46 to join the tension member 45 can be easily performed from the inside of the wall after the retaining members 4 are assembled to form the wall. Note that, although the joint for joining the tension member 45 to the main body 42 is described as the bolt joint 46 in the above example, this is not limited to this example, and a joint formed by welding, for example, may also be used.

Second Embodiment
4A and 4B are diagrams showing the configuration of an earth retaining member according to a second embodiment of the present invention, and are views taken along the lines A-A and B-B in the respective diagrams. In the illustrated example, the earth retaining member 4 includes an axial flange 41, a main body 42, and a circumferential flange 43, and the axial flange 41 is formed with a bolted joint 44 and a bolted joint 56, and the main body 42 is formed with an access hole 57. Note that the configuration of this embodiment is similar to that of the first embodiment, except that the bolted joint 56 is provided as a second joint, and the access hole 57 is formed, and therefore a detailed description thereof will be omitted.

In this embodiment, a bolt joint 56 is formed in the axial flange 41 as a second joint that joins the axial flange 41 of the retaining member 4 to the axial flange of another adjacent retaining member. The bolt joint 56 is composed of a bolt hole formed in the axial flange 41, a bolt 561 inserted into the bolt hole, and a nut 562 screwed onto the bolt 561. The bolt joint 56 is different from the bolt joint 44 also formed in the axial flange 41 in that the bolt joint 56 is formed on the outside (the back side in FIG. 4A, the left side in FIG. 4B) of the main body 42, not on the inside of the wall. Specifically, the bolt joint 56 is formed in the valley portion of the corrugated cross section of the main body 42 when viewed from the outside of the wall. As with the bolt joint 44, the axial flanges 41 can be joined between an earth retaining member 4 and another adjacent earth retaining member by inserting a bolt 561 from one of the earth retaining members 4 into a bolt hole formed in each of the axial flanges 41, and then screwing a nut 562 onto the bolt 561 on the other earth retaining member side to fasten them together.

As described above, since the bolt joint 56 is located on the outside of the wall, it is not easy to perform the process of screwing the nut 562 onto the bolt 561 and fastening it from the inside of the wall. Therefore, in this embodiment, an access hole 57 is formed in the crest of the corrugated cross section of the main body 42 when viewed from the inside of the wall (the front side in FIG. 4A, the right side in FIG. 4B). Note that the crest of the corrugated end face when viewed from the inside of the wall is the same as the valley of the corrugated cross section when viewed from the outside of the wall. This makes it possible to insert the bolt 561 and nut 562, as well as a hand or tool for fastening them, through the access hole 57 and perform the process of screwing the nut 562 onto the bolt 561 and fastening it.

When an access hole 57 is formed in each of the multiple peaks of the corrugated cross section of the main body 42 as in the illustrated example, each access hole 57 may be formed at a different position in the circumferential direction x of the wall body. This can minimize the cross-sectional loss of the retaining member 4 caused by forming the access holes.

In addition, for bolt joints 56 formed in positions that are easily accessible from the outside of the wall during construction, such as the top of the retaining member 4, access holes 57 do not need to be formed. In order to minimize cross-sectional loss of the retaining member 4, the access holes 57 may be blocked by welding a cover member after construction of the bolt joints 56. In addition, access holes 57 may be formed in only one of the retaining members 4 joined in the circumferential direction x, for example, by using a one-sided bolt instead of the combination of bolt 561 and nut 562.

According to the second embodiment of the present invention described above, in addition to the bolt joints 44 that are normally provided on the axial flanges 41, the axial flanges 41 are directly joined to each other by bolt joints 56 that are provided at a position on the back side of the main body 42 from the bolt joints 44. This allows stress to be distributed to each joint when a large tensile force acts in the circumferential direction x of the wall body, and prevents the axial flanges 41 from deforming at the bolt joints 44. Therefore, in this embodiment, deformation of the axial flanges 41 of the retaining member 4 can be prevented, and the function of restraining the concrete 5 around the reinforcing bar 7 can be fully exerted.

As in the first embodiment, the shape of the axial flange 41, main body 42, and circumferential flange 43 of the earth retaining member 4 may be the same as that of a conventional earth retaining member, and therefore, there is an advantage that it can be easily realized by processing the conventional earth retaining member to form, for example, bolt holes and access holes 57 for the bolt joint 56. As in the first embodiment, a new earth retaining member to be used in this embodiment may be manufactured. On the other hand, compared to the first embodiment, this embodiment has the advantage that, although a certain degree of cross-sectional loss occurs in the earth retaining member 4 due to the access holes 57, no additional member such as a tension member is required, and for example, the bolt joint 56, which is an additional joint, can be formed with the same part as the bolt joint 44 that is usually provided.

In the above example, the joint formed on the axial flange 41 on the outside of the wall relative to the main body 42 is described as a bolt joint 56 in which the axial flanges 41 are overlapped and bolted together, but this is not limited to the example. For example, a joint may be formed in which the axial flanges 41 are overlapped and fastened by a fastening means such as a vice or spring steel, or a joint may be formed in which the axial flanges 41 are overlapped and welded together.

For example, in the first embodiment described above, by adjusting the positional relationship between the bolt joint 46 that joins the tension member 45 and the access hole 57, or by constructing the bolt joint 56 before the tension member 45 and the bolt joint 46 even if the tension member 45 interferes with the access hole 57, it is possible to combine the first embodiment with this embodiment to create a configuration that can withstand a larger tensile force acting in the circumferential direction x of the wall body.

Third Embodiment
5A and 5B are diagrams showing the configuration of an earth retaining member according to a third embodiment of the present invention, and are views taken along lines A-A and B-B in the respective diagrams. In the illustrated example, the earth retaining member 4 includes an axial flange 61, a main body 42, and a circumferential flange 43, and the axial flange 61 is formed with a bolted joint 44 and a bolted joint 66. Note that the configuration of this embodiment is similar to that of the first embodiment, except that the shape of the axial flange 61 is different and the bolted joint 66 is provided as a second joint, and therefore a detailed description thereof will be omitted.

In this embodiment, the axial flange 61 of the retaining member 4 extends further inward than the peak portion 42A of the corrugated cross section of the main body 42 when viewed from the inside of the wall (the near side in FIG. 5A, the right side in FIG. 5B). In this embodiment, a bolt joint 66 is formed in the portion of the axial flange 61 extending inward of the wall as a second joint that joins the axial flange 41 of the retaining member 4 to the axial flange of another adjacent retaining member. The bolt joint 66 is composed of a bolt hole formed in the axial flange 61, a bolt 661 inserted into the bolt hole, and a nut 662 screwed onto the bolt 661.

In other words, in this embodiment, the axial flange 61 is formed wider than in the past, so that two rows of bolt joints 44, 66 can be arranged on the inside of the wall body relative to the main body 42. In the bolt joints 44, 66, the axial flanges 61 can be joined by inserting bolts 441, 661 from one retaining member 4 side into bolt holes formed in the axial flanges 61 between the retaining member 4 and another adjacent retaining member, and screwing nuts 442, 662 onto the bolts 441, 661 on the other retaining member side to fasten them. Note that, although the axial flanges extend slightly inwardly of the wall body beyond the crest portion 42A of the corrugated cross section in all other embodiments, in this embodiment, the axial flanges 61 extend farther inwardly of the wall body than the crest portion 42A of the corrugated cross section to an extent that the bolt joints 66 can be formed.

In addition, in the height direction (axial direction of the wall body), the bolt joints 66 may be provided at the same height as the bolt joints 44 as in the example shown in Fig. 5B, or, although not shown, may be provided at a different height than the bolt joints 44. For example, the bolt joints 66 may be provided at the height of the peak portions 42A of the corrugated cross section of the earth retaining member 4 shown in Fig. 5B.
The bolted joints 66 may be provided in the same number as the bolted joints 44, or, although not shown, may be provided in a greater or lesser number than the bolted joints 44. For example, a greater number of bolted joints 66 than the bolted joints 44 may be provided by providing bolted joints 66 at the height of the peak portions 42A of the corrugated cross section of the earth retaining member 4 in addition to the positions shown in Fig. 5B.

According to the third embodiment of the present invention as described above, the axial flanges 61 are directly joined to each other by two rows of bolt joints 44, 66. This allows stress to be distributed to each joint when a large tensile force acts in the circumferential direction x of the wall body, and prevents the axial flanges 61 from deforming at the bolt joints 44. Therefore, in this embodiment, deformation of the axial flanges 61 of the retaining member 4 can be prevented, and the function of restraining the concrete 5 around the reinforcing bar 7 can be fully exerted.

In this embodiment, the axial flange 61 of the soil retaining member 4 extends to the inside of the wall and is formed to be wide, so the shape of the soil retaining member 4 itself is different from that of conventional soil retaining members. On the other hand, since both of the two rows of bolt joints 44, 66 are positioned on the inside of the wall relative to the main body 42, there is no need to form access holes in the main body 42 during construction, and cross-sectional loss of the main body 42 is minimized. In addition, the fact that the axial flange 61 is wide is itself advantageous in preventing deformation.

In the above example, the joint formed at the portion where the axial flange 61 extends to the inside of the wall body is described as a bolt joint 66 in which the axial flanges 61 are overlapped and bolted together, but this is not limited to the example. For example, a joint may be formed in which the axial flanges 61 are overlapped and fastened by a fastening means such as a vice or spring steel, or a joint may be formed in which the axial flanges 61 are overlapped and welded together.

For example, in the first embodiment, by forming a notch or through hole in the axial flange 61 at a position that interferes with the tension member 45, it is possible to combine the first embodiment with this embodiment. Also, since the bolt joint 56 and the access hole 57 in the second embodiment do not interfere with the axial flange 61 and the bolt joint 66 of this embodiment, it is also possible to combine the second embodiment with this embodiment. It is also possible to combine the configurations of the above multiple embodiments to create a configuration that can withstand a larger tensile force acting in the circumferential direction x of the wall body.

(Fourth embodiment)
6A and 6B are diagrams showing the configuration of an earth retaining member according to a fourth embodiment of the present invention, and are views taken along the lines A-A and B-B in the diagrams. In the illustrated example, the earth retaining member 4 includes an axial flange 41, a main body 42, and a circumferential flange 43, and a bolt joint 44 is formed in the axial flange 41, and a reinforcing plate 76 is interposed between the head or nut 442 of the bolt 441 and the axial flange 41 in the bolt joint 44. The configuration of this embodiment is the same as that of the first embodiment, except that the second joint is not provided and the reinforcing plate 76 is interposed in the bolt joint 44, so a detailed description thereof will be omitted.

In this embodiment, in the bolt joint 44 where the axial flange 41 is overlapped with the axial flange of another retaining member and bolted, a reinforcing plate 76 is inserted between the head of the bolt 441 and the axial flange 41, and between the nut 442 and the axial flange of the other retaining member (the arrangement of the bolt 441 and the nut 442 may be reversed). The reinforcing plate 76 is, for example, larger than a normal washer, and is in surface contact with the axial flange 41 around the bolt joint 44, i.e., the valley portion of the corrugated cross section of the main body 42. The reinforcing plate 76 has a thickness such that the apparent thickness of the axial flange 41 at the bolt joint 44, i.e., the sum of the thickness of one axial flange 41 and the thickness of the reinforcing plate 76, is more than twice the thickness of the main body 42.

According to the fourth embodiment of the present invention described above, by inserting the reinforcing plate 76, the apparent plate thickness of the axial flange 41 at the bolt joint 44 is more than twice the plate thickness of the main body 42. This reinforces the rigidity of the axial flange 41 at the bolt joint 44, and prevents the axial flange 41 from deforming at the bolt joint 44 when a large tensile force acts in the circumferential direction x of the wall body. Therefore, in this embodiment, deformation of the axial flange 41 of the retaining member 4 is prevented, and the function of restraining the concrete 5 around the reinforcing bar 7 can be fully exerted.

This embodiment has the advantage that the shapes of the axial flange 41, main body 42, and circumferential flange 43 of the soil retaining member 4 can be the same as those of conventional soil retaining members, and additional processing such as drilling holes in the main body 42 is not required. In addition, since the reinforcing plate 76 does not interfere with the components of the first to third embodiments described above, it is possible to combine any of the first to third embodiments described above with this embodiment to create a configuration that can withstand a larger tensile force acting in the circumferential direction x of the wall body.

Fifth Embodiment
7A and 7B are diagrams showing the configuration of an earth retaining member according to a fifth embodiment of the present invention, and are views taken along lines A-A and B-B in the respective diagrams. In the illustrated example, the earth retaining member 4 includes an axial flange 81, a main body 42, and a circumferential flange 43, and a bolt joint 44 is formed in the axial flange 81. Note that the configuration of this embodiment is similar to that of the first embodiment, except that the shape of the axial flange 81 is different and no second joint is provided, and therefore a detailed description thereof will be omitted.

In this embodiment, the plate thickness t1 of the axial flange 81 of the soil retaining member 4 is 1.8 times or more the plate thickness t2 of the main body 42. Specifically, the plate thickness of the main body 42 and the plate thickness of the axial flange 81 can be set as shown in Table 1 below. Note that what is shown as "standard" in Table 1 is the standard plate thickness of the axial flange in a conventionally used liner plate, and what is shown as "reinforced" is an example of the plate thickness of the axial flange in the soil retaining member according to this embodiment.

According to the fifth embodiment of the present invention described above, the plate thickness of the axial flange 81 in the retaining member 4 is 1.8 times or more the plate thickness of the main body 42, so that the plate thickness of the axial flange 81 alone at the bolt joint 44 is 1.8 times or more the plate thickness of the main body 42. This improves the rigidity of the entire axial flange 81 including the bolt joint 44, and prevents the axial flange 81 from deforming at the bolt joint 44 when a large tensile force acts in the circumferential direction x of the wall body. Therefore, in this embodiment, deformation of the axial flange 81 of the retaining member 4 is prevented, and the function of restraining the concrete 5 around the reinforcing bar 7 can be fully exerted.

In this embodiment, the plate thickness of the axial flange 81 of the soil retaining member 4 is greater than in the past, so the shape of the soil retaining member 4 itself is different from that of conventional soil retaining members. On the other hand, this embodiment does not require additional members such as the reinforcing plate in the above-mentioned fourth embodiment, and has the advantage of being highly effective in improving rigidity because the plate thickness of the axial flange 81 as a whole is greater. In addition, since the axial flange 81, which has a large plate thickness, does not interfere with the components of the above-mentioned first to fourth embodiments, it is also possible to combine any of the above-mentioned first to fourth embodiments with this embodiment to configure it to withstand a larger tensile force acting in the circumferential direction x of the wall body.

The above describes in detail preferred embodiments of the present invention with reference to the attached drawings, but the present invention is not limited to these examples. It is clear that a person skilled in the art of the technical field to which the present invention pertains can conceive of various modified or revised examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

1...underground structure, 2...ground, 3...shaft, 3W...wall, 4...retaining member, 41, 61, 81...axial flange, 42...main body, 42A...ridge, 43...circumferential flange, 44...bolt joint (first joint), 441...bolt, 442...nut, 45...tensile member, 46, 56, 66...bolt joint (second joint), 461...one-sided bolt, 561, 661...bolt, 562, 662...nut, 57...access hole, 76...reinforcing plate, 5...concrete, 6...filler, 7...reinforcing bar.

Claims (9)

A retaining member that is combined with a wall body in the circumferential direction and the axial direction,
an axial flange extending in the axial direction at the circumferential end;
a main body portion having a corrugated cross section extending in the circumferential direction and abutting against the axial flange;
a first joint portion formed in the axial flange at a valley portion of the corrugated cross section when viewed from the inside of the wall body, and joining the axial flange to an axial flange of another adjacent earth retaining member;
a second joint portion formed at a location different from the first joint portion and joining the axial flange and the axial flange of the other earth retaining member ;
The second joint is a retaining member to which a tension member is joined, the tension member being formed in the main body at the peak portion of the corrugated cross section when viewed from the inside of the wall, and being erected inside the wall, over the axial flange, to the joint with another retaining member . The retaining member according to claim 1 , wherein the second joints formed on each of a plurality of peak portions of the corrugated cross section are formed at positions shifted in the circumferential direction. A retaining member that is combined with a wall body in the circumferential direction and the axial direction,
an axial flange extending in the axial direction at the circumferential end;
a main body portion having a corrugated cross section extending in the circumferential direction and abutting against the axial flange;
a first joint portion formed in the axial flange at a valley portion of the corrugated cross section when viewed from the inside of the wall body, and joining the axial flange to an axial flange of another adjacent earth retaining member;
a second joint portion formed at a location different from the first joint portion and joining the axial flange and the axial flange of the other earth retaining member;
Equipped with
the second joint is formed in the axial flange at a valley portion of the corrugated cross section when viewed from the outside of the wall ;
An earth retaining member in which an access hole to the second joint is formed in the main body at the peak portion of the corrugated cross section when viewed from the inside of the wall body . The retaining member according to claim 3 , wherein the access holes formed in each of the plurality of peak portions of the corrugated cross section are formed at positions shifted in the circumferential direction. A retaining member that is combined with a wall body in the circumferential direction and the axial direction,
an axial flange extending in the axial direction at the circumferential end;
a main body portion having a corrugated cross section extending in the circumferential direction and abutting against the axial flange;
a first joint portion formed in the axial flange at a valley portion of the corrugated cross section when viewed from the inside of the wall body, and joining the axial flange to an axial flange of another adjacent earth retaining member;
a second joint portion formed at a location different from the first joint portion and joining the axial flange and the axial flange of the other earth retaining member;
Equipped with
The axial flange extends toward the inside of the wall body beyond a peak portion of the corrugated cross section when viewed from the inside of the wall body,
The second joint is a retaining member formed at a portion where the axial flange extends inwardly of the wall body. The second joint is joined by overlapping the axial flange with the axial flange of the other retaining member and bolting, fastening with a fastening means , or welding. The retaining member according to claim 1 , further comprising a reinforcing plate in surface contact with the axial flange at the first joint portion. The retaining member according to claim 7 , wherein the sum of the plate thickness of the axial flange and the plate thickness of the reinforcing plate is at least twice the plate thickness of the main body portion. The retaining member according to claim 1 , wherein the plate thickness of the axial flange is 1.8 times or more the plate thickness of the main body portion.

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