JP2023147049A - Underground structure construction method - Google Patents

Abstract

To provide an underground structure construction method enabling construction to be easily and safely performed.SOLUTION: An underground structure construction method in the embodiment comprises: a cylindrical wall body erection step to hold a lateral wall member 1, which has joint parts 11, 12 on both ends thereof in short-length direction, when vertical direction is longitudinal direction, so as to be erected on the foundation, and connect one joint part 11 of the held lateral wall member 1 and the other joint part 12 of other lateral wall member 10 different from the lateral wall member 1, and erect a cylindrical wall body 10, which is formed into a cylindrical shape by a plurality of lateral wall members 1, on the ground; an installation step to sequentially install the plurality of lateral wall members 1 constituting the cylindrical wall body 10 into the ground and bury the cylindrical wall body 10 in the ground; and an excavation step to excavate the inside of the cylindrical wall body 10.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for constructing an underground structure.

When constructing underground structures such as water collection wells, deep foundation piles, underwater temporary cofferdams, and bridge piers, liner plates are mainly used as earth retainers. For example, a technique disclosed in Patent Document 1 is disclosed as a technique for constructing an underground structure such as a water collection well using a liner plate.

The method of connecting liner plates in Patent Document 1 is to attach a temporary fixing tool to the circumferential flange of one liner plate, and temporarily fixing the liner plate by attaching a temporary fixing tool to the circumferential flange of another liner plate. A fastening fitting is inserted into each hole of the flange, and each circumferential flange is connected via the fastening member.

Japanese Patent Application Publication No. 2018-188865

The technique disclosed in Patent Document 1 eliminates the need for a worker to hold the liner plate at a predetermined height by applying a temporary fastener to the circumferential flange of the liner plate. However, before holding the liner plates at a predetermined height, it is necessary to manually transport and position a large number of liner plates to a predetermined position, and then it is necessary to connect the liner plates to each other with a large number of bolts and nuts.

For this reason, in the technique disclosed in Patent Document 1, when assembling the liner plate, there are a large number of connection points using bolts and nuts, and the construction takes time. Furthermore, the weight of one liner plate is approximately 30 kg, and a considerable number of liner plates must be moved and positioned manually, placing a heavy burden on the operator. For this reason, there has been a need for technology that allows easy construction of underground structures. Further, in the technique disclosed in Patent Document 1, after the ground is excavated and before the liner plate is assembled, the excavated surface is exposed on the side of the ground, so there is a concern about safety against collapse. Therefore, there has been a need for a technology that can improve the safety of constructing underground structures.

Therefore, the present invention was devised in view of the above-mentioned circumstances, and its purpose is to provide a method for constructing an underground structure that allows construction to be carried out easily and safely. It's about doing.

The method for constructing an underground structure according to the first invention is a method for constructing an underground structure, in which the vertical direction is the longitudinal direction, and joints are formed at both ends in the transverse direction. The side wall member to be held is held in an upright state with respect to the ground, and one joint part of the held side wall member is connected to the other joint part of another side wall member different from the side wall member, and a plurality of a cylindrical wall erection step in which a cylindrical wall formed into a cylindrical shape by the side wall members is erected on the ground; and a plurality of side wall members constituting the cylindrical wall are sequentially driven into the ground. The method is characterized in that it includes a placing step of burying the cylindrical wall in the ground, and an excavating step of excavating the inside of the cylindrical wall.

A construction method for an underground structure according to a second aspect of the invention is such that, in the first aspect, in the step of erecting the cylindrical wall, the lower end of the side wall member is buried in the ground, and the side wall member is placed in an erect state. It is characterized by holding.

A method for constructing an underground structure according to a third aspect of the present invention is that in the first or second aspect, in the step of erecting the cylindrical wall, a guide member is installed to serve as a guide when pouring the side wall member. In the casting process, the side wall member is guided by the guide member and the side wall member is cast.

In the method for constructing an underground structure according to a fourth invention, in any one of the first to third inventions, the excavation step includes installing a beam material inside the cylindrical wall after excavating to a predetermined depth. The method is characterized by having a beam installation step of installing a beam.

A method for constructing an underground structure according to a fifth invention is that in any one of the first to fourth inventions, the excavation step includes installing a water collection pipe extending toward the outside of the cylindrical wall. and a drain pipe installation step of installing a drain pipe extending toward the outside of the cylindrical wall at the lower end of the cylindrical wall.

A construction method for an underground structure according to a sixth invention is characterized in that, in any one of the first to fifth inventions, the side wall member is a steel sheet pile.

A construction method for an underground structure according to a seventh invention is characterized in that, in any of the first to sixth inventions, the side wall member is a steel sheet pile with a thickness of 10 mm or less.

A method for constructing an underground structure according to an eighth invention is characterized in that in any one of the first to seventh inventions, the side wall member is a stainless steel sheet pile.

According to the first invention to the eighth invention, the side wall member in which the vertical direction is the longitudinal direction and the joint portions are formed at both ends in the lateral direction is held in an upright state with respect to the ground, and the held side wall member is One joint part and the other joint part of another side wall member different from the side wall member are connected, and a cylindrical wall body formed in a cylindrical shape by a plurality of side wall members is installed upright on the ground. Includes a wall erection process. As a result, even if the cylindrical wall does not have a closed cross section in plan view due to errors in the placement position of the side wall members, manufacturing errors, etc., the held side wall members can be repositioned and the cylindrical wall can be closed in plan view. Can be modified in cross section. As a result, construction can be performed easily.

Further, according to the first to eighth inventions, in the cylindrical wall erection step, the cylindrical wall is erected on the ground, so the finished shape of the cylindrical wall can be checked in advance on the ground. .

Further, according to the first to eighth inventions, the method includes the step of sequentially placing a plurality of side wall members constituting the cylindrical wall in the ground, and burying the cylindrical wall in the ground. Thereby, the side wall member can be quickly driven into the ground using the vibrating pile driver. Therefore, it is possible to omit the conventional work of manually connecting the liner plates. In addition, since the pile is driven by a vibrating pile driver, the load on the worker can be reduced and labor can be saved. Therefore, construction can be easily performed.

Further, according to the first to eighth inventions, after the step of erecting the cylindrical wall, the plurality of side wall members constituting the cylindrical wall are sequentially cast into the ground, and the cylindrical wall is placed in the ground. It includes a pouring process for burying the concrete. Thereby, when one side wall member is cast, it is possible to cast the one side wall member while sliding it onto the joint portions of the other side wall members arranged on both sides. For this reason, it becomes possible to reliably construct a cylindrical wall body of a predetermined shape underground.

Further, according to the first to eighth inventions, after the pouring step, an excavation step of excavating the inside of the cylindrical wall body is provided. This prevents the excavated surface from being exposed to the sides and prevents the ground from collapsing. Therefore, construction can be carried out safely.

In particular, according to the second aspect of the invention, in the step of erecting the cylindrical wall, the lower end of the side wall member is buried in the ground and the side wall member is maintained in an upright state. Thereby, the state in which the side wall member stands up against the ground can be stabilized. Therefore, even if the cylindrical wall does not have a closed cross section in plan view due to errors in the placement position of the side wall members, manufacturing errors, etc., the side wall members can be pulled out of the ground and repositioned to make the cylindrical wall flat. It can be corrected to a closed section visually. As a result, construction can be performed easily.

In particular, according to the third invention, in the cylindrical wall erection step, a guide member is installed in the ground to serve as a guide when pouring the side wall member, and in the pouring step, the side wall member is guided by the guide member. Then, pour the side wall members. This makes it easy to cast the side wall member in a predetermined position. Therefore, the accuracy of the shape of the underground structure is improved.

In particular, according to the fourth invention, the excavation step includes a beam installation step of installing a beam inside the cylindrical wall after excavating to a predetermined depth. Thereby, the cylindrical wall body 10 can be reinforced as appropriate, making it possible to carry out the construction even more safely.

In particular, according to the fifth invention, the excavation step includes a water collection pipe installation step of installing a water collection pipe extending toward the outside of the cylindrical wall; and a drain pipe installation step of installing a drain pipe extending toward the drain pipe. This allows the underground structure to be constructed as a water collection well.

In particular, according to the sixth invention, the side wall member is a steel sheet pile. By using commonly available steel sheet piles, it is possible to construct underground structures using members with stable quality and cross-sectional performance.

In particular, according to the seventh invention, the side wall member is a lightweight steel sheet pile with a thickness of 10 mm or less. As a result, compared to U-shaped steel sheet piles and the like having a thickness of more than 10 mm, lightweight steel sheet piles with a thickness of 10 mm or less have more room at the joints and a larger rotatable angle of the joints. Therefore, when constructing a cylindrical wall body that has a closed cross section in plan view, it becomes easier to assemble. Further, since the side wall member is thin, it is easy to make a hole in the cylindrical wall when boring the ground in the water collection pipe installation process and the drainage pipe installation process.

In particular, according to the eighth invention, it is a stainless steel sheet pile. This improves corrosion resistance and makes it possible to reduce the life cycle cost of underground structures.

FIG. 1 is a partially cutaway front view showing an example of the underground structure in the first embodiment. FIG. 2 is a plan view showing an example of the underground structure in the first embodiment. FIG. 3 is a front view showing a step of erecting a cylindrical wall body in an example of the method for constructing an underground structure in the first embodiment. FIG. 4 is a perspective view showing a step of erecting a cylindrical wall body in an example of the method for constructing an underground structure in the first embodiment. FIG. 5 is a front view showing a step of erecting a cylindrical wall body in an example of the method for constructing an underground structure in the first embodiment. FIG. 6 is a front view showing a pouring process of an example of the method for constructing an underground structure in the first embodiment. FIG. 7 is a front view showing a pouring process of an example of the method for constructing an underground structure in the first embodiment. FIG. 8 is a partially cutaway front view showing an excavation process in an example of the method for constructing an underground structure in the first embodiment. FIG. 9 is a partially cutaway front view showing an excavation process in an example of the method for constructing an underground structure in the first embodiment. FIG. 10 is a side view showing a step of erecting a cylindrical wall body in an example of the method for constructing an underground structure in the second embodiment. FIG. 11 is a front view showing a pouring process of an example of the method for constructing an underground structure in the third embodiment. FIG. 12 is a front view showing a pouring process of an example of the method for constructing an underground structure in the third embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, the form for carrying out the construction method of the underground structure to which this invention is applied is demonstrated in detail, referring to drawings.

(First embodiment)
FIG. 1 is a partially cutaway front view showing an example of an underground structure 100 in the first embodiment. FIG. 2 is a plan view showing an example of the underground structure 100 in the first embodiment.

The underground structure 100 is used, for example, as a water collection well. The underground structure 100 may be used as a deep foundation pile, an underwater temporary cofferdam, a bridge pier, or the like.

The underground structure 100 includes a cylindrical wall body 10 buried underground. The underground structure 100 may further include a beam 2, a water collection pipe 3, and a drain pipe 4.

The cylindrical wall body 10 is formed into a cylindrical shape, such as a cylinder, by connecting a plurality of side wall members 1 in the circumferential direction.

For the side wall member 1, for example, a hat-shaped steel sheet pile is used. The side wall member 1 is formed into a rectangular shape when viewed from the front side. The side wall member 1 has a vertical direction as its longitudinal direction, and joint parts 11 and 12 are formed at both ends in the lateral direction.

It is preferable that the side wall member 1 is a steel sheet pile with a thickness of 10 mm or less. Moreover, it is preferable that the side wall member 1 is a stainless steel sheet pile.

The beam material 2 is made of, for example, H-beam steel. The beam material 2 reinforces the cylindrical wall 10 and is provided inside the cylindrical wall 10. The beam material 2 is arranged along the inner peripheral surface of the cylindrical wall body 10. The beam material 2 may be a square steel pipe or the like.

The water collection pipe 3 is formed to extend toward the outside of the cylindrical wall body 10, and is buried underground. The water collection pipe 3 is a known piping material such as a vinyl chloride pipe. The water collection pipe 3 is arranged so as to be inclined downward as it approaches the cylindrical wall body 10. The water collection pipe 3 collects rainwater, groundwater, etc. in the ground outside the cylindrical wall 10 into the inside of the cylindrical wall 10. A plurality of water collection pipes 3 are arranged spaced apart in the vertical direction.

The drain pipe 4 is formed to extend toward the outside of the cylindrical wall body 10, and is buried underground. The drain pipe 4 is provided at the lower end of the cylindrical wall 10. The drain pipe 4 is a known piping material such as a steel pipe. The drain pipe 4 drains water collected inside the cylindrical wall 10 to the outside of the cylindrical wall 10.

Next, an example of a method for constructing an underground structure in the first embodiment will be described.

The underground structure construction method is a method of constructing the underground structure 100, and includes a cylindrical wall erection process, a casting process, and an excavation process.

<Cylindrical wall erection process>
In the cylindrical wall erection step, first, as shown in FIG. 3, a guide member 5 is placed to serve as a guide when the side wall member 1 is cast into the ground. The guide member 5 is made of a steel plate and has an opening 51 formed therein.

In the cylindrical wall erection process, as shown in FIGS. 4 and 5, while the outer surface of the side wall member 1 is brought into contact with the inner surface of the opening 51 of the guide member 5, the vibrating pile is suspended from a crane (not shown). The lower end portion 1a of the side wall member 1 is buried using a hammer. The vibratory pile driver is separated from the side wall member 1, and the side wall member 1 is held in an upright state with respect to the ground. At this time, the central portion of the lower end 1a of the side wall member 1 and the upper end 1b of the side wall member 1 is exposed above the ground.

In the cylindrical wall erection process, the joint part 11 of the side wall member 1 whose lower end 1a is buried and held in the ground is connected to the joint part 12 of another side wall member 1 different from the side wall member 1, The lower end 1a of the other side wall member 1 is buried and held in the ground. By repeatedly holding the side wall member 1 and connecting the joint portion 11 of the held side wall member 1 with the joint portion 12 of the other side wall member 1, a cylinder formed in a cylindrical shape by the plurality of side wall members 1 is formed. A shaped wall body 10 is erected on the ground.

In this way, in the cylindrical wall erection process, the side wall member 1, in which the vertical direction is the longitudinal direction and the joint parts 11 and 12 are formed at both ends in the lateral direction, is held in an upright state with respect to the ground. , connects one joint part 11 of the held side wall member 1 and the other joint part 12 of another side wall member 1 different from the side wall member 1, and is formed into a cylindrical shape by a plurality of side wall members 1. A cylindrical wall body 10 is erected on the ground. Since the lower end portion 1a of the side wall member 1 is buried in the ground, the cylindrical wall body 10 stands up against the ground.

As a result, even if the cylindrical wall body 10 does not have a closed cross section in plan view due to errors in the placement position of the side wall member 1, manufacturing errors, etc., the side wall member 1 that is being held can be pulled out from the ground and repositioned, and the cylindrical wall body 10 can be repositioned. The wall 10 can be modified to have a closed cross section in plan view.

<Pouring process>
Next, in the driving process, as shown in FIGS. 6 and 7, a plurality of side wall members 1 constituting the cylindrical wall body 10 are sequentially driven into the ground using a vibrating pile driver suspended from a crane (not shown). Then, the cylindrical wall body 10 is buried underground.

As shown in FIG. 6, the joint portion 11 of one side wall member 1 that is cast into the ground is connected to the joint portion 12 of another side wall member 1 adjacent to the one side wall member 1. Further, the joint portion 12 of one side wall member 1 that is cast into the ground is connected to the joint portion 11 of another side wall member 1 adjacent to the one side wall member 1. That is, one side wall member 1 to be cast into the ground is buried in the ground while being slid into the joint portions 11 and 12 of the other side wall members 1 on both sides. At this time, the central portion of the lower end 1a of the side wall member 1 and the upper end 1b of the side wall member 1 is buried underground. The upper end portion 1b of the side wall member 1 may be buried underground or may be slightly exposed above the ground.

In the casting process, the side wall member 1 is guided by the guide member 5 and is cast into the ground. In the casting process, the side wall member 1 is cast while bringing the outer surface of the side wall member 1 into contact with the inner circumferential surface of the opening 51.

Then, as shown in FIG. 7, in the pouring process, all the side wall members 1 constituting the cylindrical wall body 10 are buried underground. In the pouring process, the guide member 5 is removed after the cylindrical wall body 10 is buried underground.

<Excavation process>
Next, in the excavation process, as shown in FIGS. 8 and 9, the inside of the cylindrical wall body 10 is excavated. The excavation process includes a beam installation process, a water collection pipe installation process, and a drainage pipe installation process.

As shown in FIG. 8, the excavation process includes a beam installation process of installing the beam 2 inside the cylindrical wall 10 after excavating to a predetermined depth. Thereby, the cylindrical wall body 10 can be reinforced.

As shown in FIG. 9, the excavation process includes a water collection pipe installation process in which a water collection pipe 3 extending toward the outside of the cylindrical wall body 10 is installed after excavation to a predetermined depth or after the excavation is completed. have In the water collection pipe installation step, a hole is formed in the cylindrical wall 10 and underground by boring or the like, and the water collection pipe 3 is installed in the formed hole.

The excavation process includes a drain pipe installation process of installing a drain pipe 4 extending toward the outside of the cylindrical wall 10 at the lower end of the cylindrical wall 10 after the excavation is completed. In the drain pipe installation step, a hole is formed in the cylindrical wall body 10 and in the ground by boring or the like, and the drain pipe 4 is installed in the formed hole.

With the above, an example of the method for constructing an underground structure is completed.

According to this embodiment, the side wall member 1, in which the vertical direction is the longitudinal direction and the joint parts 11 and 12 are formed at both ends in the lateral direction, is held in an upright state with respect to the ground. One joint part 11 of the side wall member 1 and the other joint part 12 of another side wall member 1 different from the side wall member 1 are connected, and a cylindrical wall body 10 formed in a cylindrical shape by a plurality of side wall members 1 is connected. It includes a process for erecting a cylindrical wall on the ground. As a result, even if the cylindrical wall 10 does not have a closed cross section in plan view due to an error in the placement position of the side wall member 1, a manufacturing error, etc., the held side wall member 1 can be repositioned and the cylindrical wall 10 can be It can be corrected to a closed cross section in plan view. As a result, construction can be performed easily.

Further, according to the present embodiment, in the cylindrical wall erecting step, the cylindrical wall 10 is erected on the ground, so that the completed shape of the cylindrical wall 10 can be checked in advance on the ground.

Further, according to the present embodiment, a casting step is provided in which the plurality of side wall members 1 constituting the cylindrical wall body 10 are sequentially placed in the ground, and the cylindrical wall body 10 is buried in the ground. Thereby, the side wall member 1 can be quickly driven into the ground using the vibrating pile driver. Therefore, it is possible to omit the conventional work of manually connecting the liner plates. In addition, since the pile is driven using a vibrating pile driver, the load on the worker can be reduced, resulting in labor savings. Therefore, construction can be easily performed.

Furthermore, according to the present embodiment, both the crane and the vibrating pile driver are commonly available, and construction can be carried out without special equipment such as a silent piler. Therefore, there are fewer restrictions during construction, and it is possible to improve the versatility of construction.

Further, according to the present embodiment, after the cylindrical wall erection process, the plurality of side wall members 1 constituting the cylindrical wall 10 are sequentially cast into the ground, and the cylindrical wall 10 is placed in the ground. Equipped with a pouring process for burying. Thereby, when pouring one side wall member 1, it is possible to pour one side wall member 1 while sliding it onto the joint portions 11 and 12 of other side wall members 1 arranged on both sides. For this reason, it becomes possible to reliably construct the cylindrical wall body 10 of a predetermined shape underground.

Moreover, according to this embodiment, the excavation process of excavating the inside of the cylindrical wall body 10 is provided after the pouring process. This prevents the excavated surface from being exposed to the sides and prevents the ground from collapsing. Therefore, construction can be carried out safely.

According to this embodiment, in the cylindrical wall erection step, the lower end 1a of the side wall member 1 is buried in the ground and the side wall member 1 is maintained in an upright state. Thereby, the state in which the side wall member 1 stands up against the ground can be stabilized. Therefore, even if the cylindrical wall body 10 does not have a closed cross section in plan view due to an error in the placement position of the side wall member 1, a manufacturing error, etc., the side wall member 1 is pulled out from the ground and repositioned, and the cylindrical wall body 10 is The body 10 can be modified to have a closed cross section in plan view. As a result, construction can be performed easily.

According to this embodiment, in the cylindrical wall erection process, the guide member 5 is installed to serve as a guide when pouring the side wall member 1, and in the pouring process, the side wall member 1 is guided by the guide member 5. Then, the side wall member 1 is cast. This makes it easy to cast the side wall member 1 in a predetermined position. Therefore, the accuracy of the shape of the underground structure 100 is improved.

According to this embodiment, the excavation process includes a beam installation process of installing the beam 2 inside the cylindrical wall 10 after excavating to a predetermined depth. Thereby, the cylindrical wall body 10 can be reinforced as appropriate, making it possible to carry out the construction even more safely.

According to this embodiment, the excavation process includes a water collection pipe installation process in which a water collection pipe 3 extending toward the outside of the cylindrical wall 10 is installed, and a water collection pipe 3 is installed at the lower end of the cylindrical wall 10. and a drain pipe installation step of installing a drain pipe 4 extending outward. Thereby, the underground structure 100 can be constructed as a water collection well.

According to this embodiment, the side wall member 1 is a steel sheet pile. By using commonly available steel sheet piles, it is possible to construct the underground structure 100 using members with stable quality and cross-sectional performance.

According to this embodiment, the side wall member 1 is a lightweight steel sheet pile with a thickness of 10 mm or less. As a result, compared to U-shaped steel sheet piles and the like having a thickness of more than 10 mm, lightweight steel sheet piles with a thickness of 10 mm or less have more room at the joints and a larger rotatable angle of the joints. Therefore, when constructing the cylindrical wall body 10 that has a closed cross section in plan view, it becomes easier to assemble. Furthermore, since the side wall member 1 is thin, it is easy to make holes in the cylindrical wall body 10 when boring the ground in the water collection pipe installation process and the drainage pipe installation process.

According to this embodiment, it is a stainless steel sheet pile. This improves corrosion resistance and makes it possible to suppress the life cycle cost of the underground structure 100.

(Second embodiment)
Next, an example of a method for constructing an underground structure in the second embodiment will be described. Hereinafter, detailed explanations of the same configurations as in the first embodiment will be omitted.

The underground structure construction method is a method of constructing the underground structure 100, and includes a cylindrical wall erection process, a casting process, and an excavation process.

<Cylindrical wall erection process>
In the cylindrical wall erection step, first, as shown in FIG. 10, a holding member 6 for holding the side wall member 1 in an upright state is placed on the ground. The holding member 6 is formed to have an L-shaped cross section, for example, and includes a bottom plate portion 61 that extends along the ground, and a plate-shaped guide member 62 that stands up from the bottom plate portion 61.

In the cylindrical wall erection process, the pair of holding members 6 are placed on the ground with a distance between them. In the cylindrical wall erection step, the side wall member 1 is placed between the pair of holding members 6, and the holding members 6 hold the side wall member 1 in an upright state with respect to the ground. The side wall member 1 is held between a pair of holding members 6 and maintained in an upright state with respect to the ground. At this time, the lower end portion 1a of the side wall member 1 may be placed on the ground or may be buried underground. Further, the held side wall member 1 has a central portion between the lower end 1a and the upper end 1b of the side wall member 1 exposed above the ground.

In the cylindrical wall erecting step, the cylindrical wall 10 is erected on the ground using the plurality of side wall members 1.

<Pouring process>
Thereafter, in the pouring process, the side wall member 1 is guided by the guide member 62 of the holding member 6, and the side wall member 1 is cast into the ground. In the casting process, the side wall member 1 is cast while bringing the inner and outer surfaces of the side wall member 1 into contact with the pair of guide members 62.

In the pouring step, all the side wall members 1 constituting the cylindrical wall body 10 are buried underground. In the pouring process, after the cylindrical wall body 10 is buried underground, the holding member 6 is removed.

<Excavation process>
After that, similarly to the first embodiment, an excavation process is performed to complete an example of the method for constructing an underground structure.

According to this embodiment, in the cylindrical wall erection process, the holding member 6 is installed on the ground, and the side wall member 1 is maintained in an upright state with respect to the ground by the holding member 6. Thereby, the state in which the side wall member 1 stands up can be stabilized. Therefore, even if the cylindrical wall body 10 does not have a closed cross section in plan view due to errors in the placement position of the side wall member 1, manufacturing errors, etc., the upright side wall member 1 can be removed from the holding member 6 and repositioned. The cylindrical wall body 10 can be modified to have a closed cross section in plan view. As a result, construction can be performed easily.

According to this embodiment, in the cylindrical wall erection process, a pair of holding members 6 are installed apart from each other, and the pair of holding members 6 hold the side wall member 1 in an upright state with respect to the ground. do. Thereby, the state in which the side wall member 1 stands up can be further stabilized.

According to this embodiment, in the casting process, the side wall member 1 is cast while bringing the inner and outer surfaces of the side wall member 1 into contact with the pair of guide members 62 . This makes it even easier to cast the side wall member 1 in a predetermined position. Therefore, the accuracy of the shape of the underground structure 100 is further improved.

(Third embodiment)
Next, an example of a method for constructing an underground structure in the third embodiment will be described.

<Cylindrical wall erection process>
In the method for constructing an underground structure, a step of erecting a cylindrical wall body is performed in the same manner as in the first embodiment.

<Pouring process>
In the casting process, as shown in FIG. 11, after one side wall member 1 is cast, a vertical joint side wall member 1' is placed above the one side wall member 1. The same side wall member 1 as the vertical joint side wall member 1' is used. For example, a hat-shaped steel sheet pile is used as the vertical joint side wall member 1'. The vertical joint side wall member 1' is formed into a rectangular shape when viewed from the front side. The longitudinal joint side wall member 1' has a vertical direction as its longitudinal direction, and joint parts 11' and 12' are formed at both ends in the transverse direction.

In the pouring process, as shown in FIG. 12, the side wall member 1 and the side wall member 1' for vertical joint are vertically joined by welding a patch plate 13 to the side wall member 1 and the side wall member 1' for vertical joint. In the driving process, after the side wall member 1 and the vertical joint side wall member 1' are vertically jointed, the vertical joint side wall member 1' may be driven by a vibrating pile driver, if necessary.

<Excavation process>
After that, similarly to the first embodiment, an excavation process is performed to complete an example of the method for constructing an underground structure.

According to the present embodiment, in the casting process, after one side wall member 1 is cast, a vertical joint side wall member 1' is vertically spliced above the one side wall member 1. Thereby, when the length of the side wall member 1 is shorter than the design depth of the underground structure 100, it is possible to ensure the penetration length into the ground by the vertical joint side wall member 1'. Further, the joint parts 11' and 12' of the vertical joint side wall member 1' can be slid onto the joint parts 11 and 12 of other side wall members 1 adjacent on both sides. Therefore, when the vertical joint side wall member 1' is placed above the side wall member 1, it does not wobble and is easily aligned with the lower side wall member 1 to be vertically jointed.

Although the embodiment of this invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. Furthermore, this invention can be implemented in various new forms in addition to the embodiments described above. For example, in the above embodiment, the cylindrical wall body 10 is circular in plan view, but the shape thereof is not limited to an oval shape, a horseshoe shape, a rectangular shape, or the like. Therefore, various omissions, substitutions, and changes can be made to the embodiments described above without departing from the gist of the present invention. Such novel forms and modifications are included within the scope and gist of the present invention, as well as within the scope of the claimed inventions and equivalents of the claimed inventions.

100 : Underground structure 10 : Cylindrical wall body 1 : Side wall member 1a : Lower end part 1b : Upper end part 11 : Joint part 12 : Joint part 1' : Vertical joint side wall member 11' : Joint part 12' : Joint part 13 : Backing plate 2 : Beam material 3 : Water collection pipe 4 : Drain pipe 5 : Guide member 51 : Opening part 6 : Holding member 61 : Bottom plate part 62 : Guide member

Claims (8)

An underground structure construction method for constructing an underground structure, the method comprising:
A side wall member with the vertical direction as the longitudinal direction and joint portions formed at both ends in the transverse direction is held in an upright state against the ground, and the joint portion of one of the held side wall members and the side wall member are and the other joint part of another different side wall member, and a step of erecting a cylindrical wall body formed in a cylindrical shape by a plurality of side wall members on the ground;
A placing step of sequentially placing the plurality of side wall members constituting the cylindrical wall in the ground, and burying the cylindrical wall in the ground;
A method for constructing an underground structure, comprising: an excavation step of excavating the inside of the cylindrical wall. The method for constructing an underground structure according to claim 1, wherein in the cylindrical wall erection step, the lower end of the side wall member is buried underground and the side wall member is maintained in an upright state. . In the cylindrical wall erection step, a guide member is installed in the ground to serve as a guide when pouring the side wall member,
The method for constructing an underground structure according to claim 1 or 2, wherein in the pouring step, the side wall member is guided by the guide member and the side wall member is poured. The excavation step includes a beam installation step of installing a beam inside the cylindrical wall after excavating to a predetermined depth. Construction method for underground structures. The excavation process includes:
a water collection pipe installation step of installing a water collection pipe extending toward the outside of the cylindrical wall;
a drain pipe installation step of installing a drain pipe extending toward the outside of the cylindrical wall at the lower end of the cylindrical wall;
The method for constructing an underground structure according to any one of claims 1 to 4, characterized by comprising: The method for constructing an underground structure according to any one of claims 1 to 5, wherein the side wall member is a steel sheet pile. The method for constructing an underground structure according to any one of claims 1 to 6, wherein the side wall member is a steel sheet pile with a thickness of 10 mm or less. The method for constructing an underground structure according to any one of claims 1 to 7, wherein the side wall member is a stainless steel sheet pile.

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