Design method of underground structure, construction method of underground structure, and underground structure

Abstract

To provide an underground structure having an earth retaining member, and reduced in cost and a construction period required for a bar arrangement step by omitting the bar arrangement amount or omitting bars.SOLUTION: In a design method of an underground structure including an earth retaining member installed along a wall face of a vertical shaft formed by excavating the ground, an inside solidification material filled inside the earth retaining member, and an outside solidification material filled between the earth retaining member and the wall face of the vertical shaft, an earth retaining member as a reinforcement member of a structure formed by the inside solidification material and the outside solidification material is taken into consideration.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for designing a subterranean structure, a method for constructing a subterranean structure, and a subterranean structure.

Background Art

[0002] Deep foundation generally involves constructing a soil retaining wall inside a shaft by repeating a procedure of sequentially connecting the left and right as well as the upper and lower edges of a liner plate while excavating the ground to a predetermined depth, building reinforcing bars inside the soil retaining wall, and further placing concrete. An example of the prior art related to such a deep foundation is described in Patent Document 1.

[0003] In the technique described in Patent Document 1, a spacer is fixed to a liner plate, hoop bars are placed on brackets attached to the spacer via guide bars, the intersections of the brackets and the hoop bars are tied with wire, main reinforcing bars are built inside the hoop bars, and the intersections of the main reinforcing bars and the hoop bars are tied with wire, thereby completing the process of building the reinforcing bars before placing concrete in the deep foundation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique described in Patent Document 1, members such as spacers, guide bars, and brackets are required for building the reinforcing bars. In addition to the increase in the cost of the members, there is a problem that the construction period becomes long due to the process of arranging the above members before building the reinforcing bars.

[0006] Therefore, an object of the present invention is to provide a design method, a construction method, and a subterranean structure of a subterranean structure having an earth retaining member, which enable cost reduction and construction period shortening in the reinforcement placing process by reducing the amount of reinforcement bars or omitting the reinforcement bars.

Means for Solving the Problems

[0007] [1]In a method for designing a subterranean structure including an earth retaining member installed along a wall surface of a shaft formed by excavating the ground, an inner solidifying material filled inside the earth retaining member, and an outer solidifying material filled between the earth retaining member and the wall surface of the shaft, the earth retaining member is considered as a reinforcing member of a structure formed by the inner solidifying material and the outer solidifying material. The earth retaining member includes a main body surface having a corrugated cross section, the outer solidifying material is filled between the main body surface and the wall surface of the shaft, and at least the main body surface of the earth retaining member is considered as the reinforcing member. A method for designing a subterranean structure. [2]The earth retaining member according to [1], further including a flange formed at an end of the main body surface, and fillet weld portions formed on both sides of the main body surface between the main body surface and the flange. A method for designing a subterranean structure. [3]The earth retaining member according to [1] or [2], further including a flange formed at an end of the main body surface, and a rib formed between the main body surface and the flange, with the plate surface intersecting the main body surface and the flange. A method for designing a subterranean structure. [4]As the reinforcing member, the earth retaining member and the reinforcing bars embedded in the inner solidifying material are considered. By considering the earth retaining member as the reinforcing member, the amount of reinforcement of the reinforcing bars is reduced or the reinforcing bars are omitted. The method for designing a subterranean structure according to any one of [1] to [3]. [5]The reinforcing bars are composed of main bars extending in the depth direction of the shaft and hoop bars extending in the circumferential direction of the shaft. By considering the earth retaining member as the reinforcing member, the amount of reinforcement of the hoop bars is reduced or the hoop bars are omitted. The method for designing a subterranean structure according to [4]. [6]A plurality of the earth retaining members are arranged in the depth direction and the circumferential direction of the shaft and connected to each other to form a cylindrical earth retaining wall. The plurality of earth retaining members are staggeredly arranged in either the depth direction or the circumferential direction. The method for designing a subterranean structure according to any one of [1] to [5]. [7]A subterranean structure designed using the method for designing a subterranean structure according to any one of [1] to [6]. [8]A construction method of a subterranean structure, comprising: an excavation step of excavating the ground to form a shaft; an earth retaining member installation step of installing an earth retaining member along the wall surface of the shaft; an outer filling step of filling an outer solidifying material between the earth retaining member and the wall surface of the shaft; and an inner filling step of filling an inner solidifying material inside the earth retaining member, wherein a plurality of the earth retaining members are arranged in the depth direction and the circumferential direction of the shaft and are connected to each other to form a cylindrical earth retaining wall, the earth retaining member installation step includes a step of arranging the plurality of earth retaining members in a staggered pattern in either the depth direction or the circumferential direction, the earth retaining member includes a main body surface having a corrugated cross section, the outer solidifying material is filled between the main body surface and the wall surface of the shaft, and at least the main body surface of the earth retaining member is considered as a reinforcing member of a structure formed by the inner solidifying material and the outer solidifying material. [9]The construction method of a subterranean structure according to [8], further comprising a steel bar arrangement step of arranging steel bars embedded in the inner solidifying material inside the earth retaining member, the steel bar arrangement step includes a step of arranging main bars extending in the depth direction and does not include a step of arranging hoop bars extending in the circumferential direction.

[10] The outer filling step includes a spraying step of spraying a first solidifying material onto the wall surface of the shaft and a pouring step of pouring a second solidifying material between the earth retaining member and the first solidifying material. The construction method of a subterranean structure according to [8] or [9].

[11] A subterranean structure constructed by using the construction method of a subterranean structure according to any one of [8] to

[10] .

Effects of the Invention

[0008] According to the above configuration, in a subterranean structure having an earth retaining member, it becomes possible to reduce the cost and shorten the construction period required for the reinforcement placing process by reducing the amount of reinforcement bars or omitting the reinforcement bars.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0011] FIG. 1 is a sectional view of a deep foundation according to a first embodiment of the present invention. As shown, the underground structure 1 includes an earth retaining member 4 installed along the wall surface 3W of a shaft 3 formed by excavating the ground 2, an inner solidifying material 5 filled inside the earth retaining member 4, an outer solidifying material 6 filled between the earth retaining member 4 and the wall surface 3W of the shaft 3, and reinforcing bars 7 embedded in the inner solidifying material 5. In the illustrated example, the outer solidifying material 6 includes a first solidifying material 6A constructed by spraying onto the wall surface 3W of the shaft 3 and a second solidifying material 6B constructed by pouring between the first solidifying material 6A and the earth retaining member 4. The inner solidifying material 5 and the outer solidifying material 6 are, for example, concrete or mortar. The reinforcing bars 7 include main bars 7A extending in the depth direction of the shaft 3 and hoop bars 7B extending in the circumferential direction of the shaft 3. The underground structure 1 may further include a formwork member 8 used when pouring the second solidifying material 6B as described later.

[0012] The earth retaining member 4 has a main body surface 41 and a flange 42 formed at the end of the main body surface 41. A plurality of earth retaining members 4 are arranged in the depth direction and the circumferential direction of the shaft 3, and a cylindrical earth retaining wall is formed by connecting them to each other using bolts or the like with the flange 42. In the illustrated example, four stages of earth retaining members 4 are connected in the depth direction. The cross-sectional shape of the earth retaining wall formed by the earth retaining members 4 can be, for example, circular, oval, rectangular, horseshoe-shaped, etc. As the earth retaining member 4, for example, a liner plate having a corrugated cross-section for the main body surface 41 can be used, but in addition to what is called a liner plate, various members having the same function can be used as the earth retaining member 4.

[0013] In this embodiment, the inner solidifying material 5 filled inside the earth retaining member 4 adheres to the corrugated cross-section of the main body surface 41 of the earth retaining member 4 and the flange 42 arranged so as to protrude inside the earth retaining member 4. The outer solidifying material 6 filled outside the earth retaining member 4 also adheres to the corrugated cross-section of the main body surface 41 of the earth retaining member 4. Furthermore, as described above, the earth retaining members 4 are connected to each other in the depth direction and the circumferential direction of the shaft 3 to form an integral earth retaining wall. Therefore, in this embodiment, in each of the depth direction and the circumferential direction, the earth retaining member 4 functions as a reinforcing member of the structure formed by the inner solidifying material 5 and the outer solidifying material 6.

[0014] Therefore, in this embodiment, in the design of the underground structure 1, by considering both the earth retaining member 4 and the reinforcing bars 7 as reinforcing members, the amount of reinforcement of the reinforcing bars 7 can be reduced. Specifically, a design can be considered in which the earth retaining member 4 is considered as the main reinforcing member and the shortage of the amount of steel is supplemented with the reinforcing bars 7. Therefore, the total cross-sectional area (number of arrangements × cross-sectional area) of each of the main bars 7A and hoop bars 7B included in the reinforcing bars 7 is smaller than when the earth retaining member 4 is not considered as a reinforcing member. As a result, all the hoop bars 7B may be omitted and only the main bars 7A may be arranged. By reducing the amount of reinforcement of the reinforcing bars 7, it becomes possible to save the cost and shorten the construction period required for the reinforcement work.

[0015] In order to effectively function the earth retaining member 4 as the above-described reinforcing member, the earth retaining member 4 is made of a steel material with a yield point exceeding 205 N / mm 2 , specifically, for example, SS400 material (yield point 245 N / mm 2 ) or SM490 material (yield point 325 N / mm 2 ).

[0016] On the other hand, as described above, the outer solidifying material 6 includes a first solidifying material 6A constructed by spraying and a second solidifying material 6B constructed by pouring. The first solidifying material 6A is a quick-setting concrete or mortar suitable for spray construction. For example, it is a concrete or mortar with about 30 kg to 60 kg of a quick-setting agent mixed per 1 m 3 of the solidifying material. On the other hand, the second solidifying material 6B is a highly fluid concrete or mortar suitable for pouring construction. Since the second solidifying material 6B is poured into the narrow space on the back side of the earth retaining member 4, it preferably has a fluidity such that it can exhibit sufficient filling properties even in a situation where vibration by a vibrator is difficult. For example, the second solidifying material 6B has a slump flow value of 30 cm or more and may be a concrete or mortar with 3 kg or more of a high-performance AE water reducing agent mixed per 1 m 3 of the solidifying material. Both the first solidifying material and the second solidifying material preferably exhibit a strength equal to or higher than that of the inner solidifying material 5 placed inside the earth retaining member 4 after hardening, specifically, for example, a compressive strength of 24 N / mm 2 or more at 28 days of age.

[0017] In this embodiment, by spraying the first solidifying material 6A of the outer solidifying material 6 onto the wall surface 3W of the shaft 3 in advance in this way, it is possible to prevent the wall surface 3W from collapsing during the construction of the outer solidifying material 6 and the distance between the earth retaining member 4 and the wall surface 3W from becoming closer than the design, or the earth retaining member 4 from directly contacting the wall surface 3W. The distance between the earth retaining member 4 and the wall surface 3W can be visually confirmed from the upper end or the lower end of the earth retaining member 4, or from the observation opening formed in the earth retaining member 4 before pouring the second solidifying material 6B. Thereby, an appropriate overlapping thickness can be ensured between the earth retaining member 4 and the wall surface 3W by filling the outer solidifying material 6, and the earth retaining member 4 can be considered as a reinforcing member as described above.

[0018] Here, when the step of pouring the second solidifying material 6B is carried out within a relatively short time after the step of spraying the first solidifying material 6A, it is difficult for a joint to remain between the first solidifying material 6A and the second solidifying material 6B after the completion of the underground structure 1. However, since the material properties of the first solidifying material 6A and the second solidifying material 6B are different as described above, even if the boundary between the first solidifying material 6A and the second solidifying material 6B is not clear after the completion of the underground structure 1, if samples are collected and analyzed on the wall surface 3W side and the earth retaining member 4 side of the outer solidifying material 6 respectively, it can be determined that the first solidifying material 6A constructed by spraying and the second solidifying material 6B formed by pouring exist.

[0019] Note that even if the outer solidifying material 6 is not constructed by the combined use of spraying and pouring as described above, if an appropriate overlapping thickness is ensured between the earth retaining member 4 and the wall surface 3W, the earth retaining member 4 can be considered as a reinforcing member. Therefore, the embodiment of the present invention is not limited to the example of constructing the outer solidifying material 6 by the combined use of spraying and pouring.

[0020] The underground structure 1 according to this embodiment is constructed, for example, by the following steps. First, an excavation step of excavating the ground 2 to form a shaft 3 is carried out, and then a spraying step of spraying a first solidifying material onto the wall surface 3W of the shaft 3 is carried out. Since the second solidifying material 6B will be poured in in a later step, the spraying thickness of the first solidifying material 6A only needs to be equal to or greater than the minimum thickness sufficient to stabilize the wall surface 3W until the second solidifying material 6B is poured in. Such a spraying thickness is thinner than the conventional spraying method, and specifically, for example, it may be 1 cm or more and less than 10 cm.

[0021] Next, an earth retaining member installation step of installing an earth retaining member 4 inside the shaft 3 is carried out. In this example, since the spraying step is carried out before the earth retaining member installation step, the earth retaining member 4 is installed inside the already sprayed first solidifying material 6A. At the lower end of the earth retaining member 4 located at the lower end of the earth retaining wall constructed at this time, a formwork member 8 is installed. The formwork member 8 may be provided with an opening for pouring the second solidifying material 6B in the next step.

[0022] After the installation of the earth retaining member 4 and the formwork member 8, a pouring step of pouring the second solidifying material 6B between the earth retaining member 4 and the first solidifying material 6A is carried out. The above-described excavation step, spraying step, earth retaining member installation step, and pouring step are repeated a predetermined number of times (it may be once), and then an inner filling step of filling the inside of the earth retaining member 4 with an inner solidifying material 5 is carried out, whereby the underground structure 1 as shown in FIG. 1 is constructed.

[0023] In the above example, the outer filling step for filling the outer solidifying material 6 is carried out separately before and after the earth retaining member installation step as the spraying step and the pouring step. However, in other examples, the outer filling step may be carried out collectively after the earth retaining member installation step. In this case, in the spraying step, the spraying nozzle is inserted through the gap between the upper or lower part of the earth retaining member 4 and the wall surface 3W of the shaft 3 to carry out the spraying step of the first solidifying material 6A.

[0024] Figure 2 is a cross-sectional view of a deep foundation according to a second embodiment of the present invention. In this embodiment, unlike the above-described first embodiment, all reinforcing bars are omitted by considering the earth retaining member 4 as a reinforcing member of a structure formed by an inner solidifying material 5 and an outer solidifying material 6. That is, in the illustrated example, the underground structure 1 does not include reinforcing bars embedded in the inner solidifying material 5. As a result of considering the earth retaining member 4 as a reinforcing member, when the required amount of steel material is satisfied only by the earth retaining member 4, it is possible to design only the earth retaining member 4 as a reinforcing member. In this case, the construction method of the underground structure 1 does not include a bar arrangement process of arranging reinforcing bars inside the earth retaining member 4.

[0025] Figure 3 is a cross-sectional view of a deep foundation according to a third embodiment of the present invention. In this embodiment, an internal space SP is formed at the center of the underground structure 1. In this case, the inner solidifying material 5 is filled between the internal space SP and the earth retaining member 4. During construction, a formwork member corresponding to the internal space SP is arranged, and the inner solidifying material 5 is filled between the formwork member and the earth retaining member 4. The embodiments of the present invention include both the case where the underground structure 1 is a hollow structure and the case where it is a solid structure in this way. The underground structure 1 having a hollow structure is used, for example, as a deep foundation, a shaft, or a sump well. Alternatively, after filling the internal space SP of the underground structure 1 with earth and sand such as residual soil during earth excavation, it may be used as a deep foundation. The underground structure 1 having a solid structure is used, for example, as a deep foundation. In the example shown in FIG. 3, all reinforcing bars are omitted as in the second embodiment described above, but reinforcing bars 7 with a reduced amount of reinforcement may be arranged as in the first embodiment.

[0026] Figure 4 is a diagram showing an example of a stagger arrangement in the circumferential direction of the earth retaining member. In the first to third embodiments described above, a plurality of earth retaining members 4 are arranged in the depth direction and the circumferential direction of the shaft 3 and connected to each other to form a cylindrical earth retaining wall. In the example shown in FIG. 4, a plurality of earth retaining members 4A are arranged in a stagger pattern in the circumferential direction of the shaft 3. That is, the earth retaining members 4A arranged in a plurality of stages in the height direction (depth direction of the shaft 3) are arranged such that the circumferential joints are staggered in adjacent stages.

[0027] When considering the earth retaining member 4 as a reinforcing member of the structure formed by the inner solidifying material 5 and the outer solidifying material 6 as described above, the joints between the earth retaining members 4 become structural weaknesses. Therefore, in the example of FIG. 4, by arranging the earth retaining members 4A in a stagger pattern in the circumferential direction, the force acting on the circumferential joint of the earth retaining member 4A can be transferred to the main body of another earth retaining member 4A through the shear resistance between the earth retaining members 4A arranged adjacent to each other in the height direction, and the joint can be reinforced. As a result, the function of the earth retaining member 4A as a reinforcing member in the circumferential direction is improved. Therefore, for example, as in the illustrated example, it is possible to omit the hoop bars 7B among the reinforcing bars 7 and arrange only the main bars 7A, or although not shown, it is also possible to reduce the amount of reinforcement of the hoop bars 7B.

[0028] FIG. 5 is a diagram showing an example of a stagger arrangement of the earth retaining members in the depth direction. In the example shown in FIG. 5, unlike the example shown in FIG. 4 above, a plurality of earth retaining members 4B are arranged in a stagger pattern in the height direction (the depth direction of the shaft 3). That is, the earth retaining members 4B arranged in a plurality of rows are arranged such that the joints in the height direction are staggered in adjacent rows. As a result, the force acting on the joint in the height direction of the earth retaining member 4B can be transferred to the main body of another earth retaining member 4B through the shear resistance between the earth retaining members 4B arranged adjacent to each other in the circumferential direction, and the joint can be reinforced. As a result, the function of the earth retaining member 4B as a reinforcing member in the height direction is improved. Therefore, for example, as in the illustrated example, the amount of reinforcement of the main bars 7A among the reinforcing bars 7 can be effectively reduced.

[0029] Figs. 6 and 7 are diagrams showing an example of adding fillet welds to the earth retaining member. In the illustrated example, the earth retaining member 4 has flanges 43 formed at both circumferential ends of the main body surface 41 in addition to the flanges 42 formed at both heightwise ends of the main body surface 41. The flange 43 is arranged in a direction intersecting the corrugated cross-section of the main body surface 41. In the example shown in Figs. 6 and 7, the earth retaining member 4 further includes fillet weld portions 44 formed on both sides between the main body surface 41 and the flange 43. Thereby, stress is effectively transmitted (preferably all stress is transmitted) from the main body surface 41 to the flange 43, and a plurality of connected earth retaining members 4 can function as an integral reinforcing member in the circumferential direction. Note that, not limited to the fillet weld portions 44 on both sides, other types of weld portions capable of transmitting stress, such as groove weld portions, may be formed.

[0030] Figs. 8 and 9 are diagrams showing an example of adding ribs to the earth retaining member. In the illustrated example, the earth retaining member 4 further includes a rib 45 formed between the main body surface 41 and the flange 43 in addition to the main body surface 41 and the flanges 42 and 43. Thereby, in the same manner as the example described above with reference to Figs. 6 and 7, stress is effectively transmitted (preferably all stress is transmitted) from the main body surface 41 to the flange 43, and a plurality of connected earth retaining members 4 can function as an integral reinforcing member in the circumferential direction. Note that, not limited to the triangular rib 45 as in the illustrated example, ribs having other shapes such as trapezoidal or fan-shaped may be formed.

[0031] Note that, if stress can be sufficiently transmitted between the main body surface 41 and the flange 43, the above-described reinforcing structure may not be provided. Further, although the example in which the earth retaining member 4 has flanges 42 and 43 at the ends of the main body surface 41 has been described above, for example, as the earth retaining member 4, a corrugated pipe without flanges 42 and 43 may be used. In this case, since there is no flange at the joint between the earth retaining members 4, and the earth retaining members 4 are connected by fixing the portion where the main body surfaces 41 overlap each other with bolts or the like, the above-described reinforcing structure between the main body surface and the flange becomes unnecessary.

[0032] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those having ordinary knowledge in the technical field to which the present invention pertains can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims, and it is naturally understood that these also belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0033] 1... Subsurface structure, 2... Ground, 3... Shaft, 3W... Wall surface, 4, 4A, 4B... Earth retaining members, 5... Inner solidifying material, 6... Outer solidifying material, 6A... First solidifying material, 6B... Second solidifying material, 7... Reinforcing bars, 7A... Main reinforcing bars, 7B... Hoop reinforcing bars, 8... Formwork member, 41... Body surface, 42, 43... Flanges, 44... Fillet weld portion, 45... Ribs, SP... Internal space.

Claims

1. In a design method for a subsurface structure including an earth retaining member installed along the wall surface of a shaft formed by excavating the ground, an inner solidifying material filled inside the earth retaining member, and an outer solidifying material filled between the earth retaining member and the wall surface of the shaft, consider the earth retaining member as a reinforcing member of the structure formed by the inner solidifying material and the outer solidifying material, the earth retaining member includes a main body surface having a corrugated cross section, and the outer solidifying material is filled between the main body surface and the wall surface of the shaft, A design method for a subsurface structure that considers at least the main body surface of the earth retaining member as the reinforcing member.

2. The design method for a subsurface structure according to claim 1, wherein the earth retaining member further includes a flange formed at an end of the main body surface, and fillet weld portions formed on both sides of the main body surface between the main body surface and the flange.

3. The design method for a subsurface structure according to claim 1 or claim 2, wherein the earth retaining member further includes a flange formed at an end of the main body surface, and ribs formed between the main body surface and the flange and having a plate surface intersecting the main body surface and the flange.

4. As the reinforcing member, consider the earth retaining member and the reinforcing bars embedded in the inner solidifying material, and reduce the amount of reinforcement of the reinforcing bars or omit the reinforcing bars by considering the earth retaining member as the reinforcing member. The design method for a subsurface structure according to any one of claims 1 to 3.

5. The reinforcing bars are composed of main bars extending in the depth direction of the shaft and hoop bars extending in the circumferential direction of the shaft, and the amount of reinforcement of the hoop bars is reduced or the hoop bars are omitted by considering the earth retaining member as the reinforcing member. The design method for a subsurface structure according to claim 4.

6. A plurality of the earth retaining members are arranged in the depth direction and the circumferential direction of the shaft and connected to each other to form a cylindrical earth retaining wall, The plurality of earth retaining members are staggeredly arranged in either the depth direction or the circumferential direction. The design method for a subsurface structure according to any one of claims 1 to 5.

7. A subsurface structure designed using the design method for a subsurface structure according to any one of claims 1 to 6.

8. An excavation step of excavating the ground to form a shaft, An earth retaining member installation step of installing an earth retaining member along the wall surface of the shaft, An outer filling step of filling an outer solidifying material between the earth retaining member and the wall surface of the shaft; An inner filling step of filling an inner solidifying material inside the earth retaining member are included, a plurality of the earth retaining members are arranged in the depth direction and the circumferential direction of the shaft and are connected to each other to form a cylindrical earth retaining wall, the earth retaining member installation step includes a step of arranging the plurality of earth retaining members in a staggered pattern in either the depth direction or the circumferential direction, the earth retaining member includes a main body surface having a corrugated cross section, and the outer solidifying material is filled between the main body surface and the wall surface of the shaft, A construction method for a subterranean structure, considering at least the main body surface of the earth retaining member as a reinforcing member of a structure formed by the inner solidifying material and the outer solidifying material.

9. The method further includes a steel bar arranging step of arranging steel bars embedded in the inner solidifying material inside the earth retaining member, The steel bar arranging step includes a step of arranging main steel bars extending in the depth direction, and does not include a step of arranging hoop bars extending in the circumferential direction. The construction method for a subterranean structure according to claim 8.

10. The outer filling step is a spraying step of spraying a first solidifying material onto the wall surface of the shaft; a pouring step of pouring a second solidifying material between the earth retaining member and the first solidifying material are included. The construction method for a subterranean structure according to claim 8 or claim 9.

11. A subterranean structure constructed using the construction method for a subterranean structure according to any one of claims 8 to 10.

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