Shelter and method for constructing shelter

Abstract

To provide an easily constructible shelter and a construction method for the shelter.SOLUTION: A shelter 100 in an embodiment includes a tubular wall body 10 formed in a tubular shape by connecting joint parts 11 and 12 of a sidewall member 1, the joint parts 11 and 12 being formed at both ends in the short-side direction. The tubular wall body 10 further includes a beam 2 provided on a lower end portion 1a of the sidewall member 1. A method for constructing the shelter 100 in an embodiment includes a tubular wall body construction step of constructing the tubular wall body 10 in a tubular shape by connecting the joint parts 11 and 12 of the sidewall member 1, the joint parts 11 and 12 being formed at both ends in the lateral direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bunker and a method for constructing a bunker.

Background Art

[0002] For example, in a war zone, a bunker is constructed as a facility that makes it easier to shoot and protects the shooter from enemy bullets. Conventionally, as technologies related to shelters using deck plates, the disclosed technologies of Patent Documents 1 and 2 have been disclosed.

[0003] The prefabricated shelter of Patent Document 1 arranges two sets of molded products in which a large number of single large deck plates subjected to bending are connected in parallel in an arched shape, and are connected using clamping bolts from above and below by opposing joining members provided with uneven portions so as to be loosely fitted across both adjacent top end portions of the large deck plates, and each lower end portion is attached to a base material.

[0004] The variable-dimension building of Patent Document 2 is a variable-dimension building using a large deck plate composed of two side walls erected on a foundation so as to face each other with the top portions of the bent large deck plates approaching each other, and a replaceable connecting member of an appropriate length for connecting between the top portions of the large deck plates.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the disclosed technologies of Patent Documents 1 and 2, since the deck plates are arranged in an arch shape, a foundation is required at the lower ends of the deck plates in order to prevent the lower ends of the deck plates from spreading and to make them self-supporting. Further, the deck plates are bolted together. Therefore, construction takes time.

[0007] Therefore, the present invention has been devised in view of the above-described problems, and an object thereof is to provide a shelter that can be easily constructed and a method for constructing the shelter.

Means for Solving the Problems

[0008] The shelter according to the present invention is characterized by including a cylindrical wall body formed by connecting the joint parts of side wall members having joint parts formed at both ends in the short side direction in a cylindrical shape.

[0009] The method for constructing a shelter according to the present invention is characterized by including a cylindrical wall body construction step of connecting the joint parts of side wall members having joint parts formed at both ends in the short side direction to construct a cylindrical wall body.

Effects of the Invention

[0010] According to the present invention, a shelter that is easy to construct can be provided.

Brief Description of the Drawings

[0011]

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MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, embodiments for implementing a bunker to which the present invention is applied and a method for constructing the bunker will be described in detail with reference to the drawings.

[0013] (First Embodiment: Bunker 100) The bunker 100 is for making it easier to shoot and protecting the shooter from enemy bullets. The bunker 100 is provided, for example, on the battlefield. The bunker 100 is provided, for example, on the ground surface. The bunker 100 includes a cylindrical tubular wall 10. Since the tubular wall 10 is cylindrical, the bunker 100 can stand on its own. The bunker 100 may further include a beam member 2. Note that the beam member 2 can also be omitted.

[0014] A soil embankment portion 9 is provided around the tubular wall 10. By providing the soil embankment portion 9 around it, the bunker 100 becomes more stable in a self-standing state. Also, the shooter inside the bunker 100 can be better protected from bullets. The soil embankment portion 9 is constructed, for example, by stacking sandbags 91. Note that the soil embankment portion 9 may simply be composed of stacked earth and sand.

[0015] The tubular wall 10 is formed in a tubular shape such as a cylinder by connecting a plurality of side wall members 1 in the circumferential direction. The tubular wall 10 is formed in a tubular shape by connecting the joint portions 11 and 12 of the side wall members 1 formed at both ends in the short direction, and the joint portions 11 and 12 of the side wall members 1 are connected to each other. The tubular wall 10 has a tubular unit 7 in which a plurality of side wall members 1 are connected in the circumferential direction.

[0016] For the side wall member 1, for example, a hat-shaped steel sheet pile is used. The side wall member 1 is formed in a rectangular shape when viewed from the front side. The side wall member 1 has the longitudinal direction as the vertical direction, and joint portions 11 and 12 are formed at both ends in the short direction.

[0017] As shown in FIG. 3, the side wall member 1 has a main board portion 13 formed in a hat shape in a cross-sectional view perpendicular to the longitudinal direction, and C-shaped joint portions 11 and 12 in a cross-sectional view perpendicular to the longitudinal direction are formed at both ends in the short direction of the main board portion 13. The joint portion 11 of one side wall member 1 and the joint portion 12 of the other side wall member 1 are configured to be fitted and connectable to each other.

[0018] The longitudinal length of the side wall member 1 is, for example, about 1 m. Accordingly, when the width of the side wall member 1 is 330 mm and the plate thickness is 5 mm, the weight per sheet of the side wall member 1 is about 22 kg. Further, when the width of the side wall member 1 is 600 mm and the plate thickness is 13 mm, the weight per sheet of the side wall member 1 is about 67 kg. When the weight per sheet of the side wall member 1 is about 22 kg to 67 kg, the construction of the shelter 100 can be carried out by manual labor of 1 to 2 persons, and thus rapid construction is possible in a war zone or the like. Further, the side wall member 1 is preferably a stainless steel sheet pile.

[0019] Note that the longitudinal length of the side wall member 1 may be 1 m or more. The shelter 100 may be constructed using heavy machinery. When the longitudinal length of the side wall member 1 is 1 m or more, for example, by removing one of the plurality of side wall members 1 constituting the cylindrical wall body 10, it becomes possible to enter and exit the shelter 100.

[0020] As the beam member 2, for example, H-shaped steel is used. The beam member 2 reinforces the cylindrical wall body 10 and is provided at the lower end portion of the cylindrical wall body 10. The beam member 2 is fixed to the side wall member 1 using fixing members 18 such as bolts and L-shaped hook bolts. A plurality of beam members 2 are provided along the circumferential direction of the cylindrical wall body 10 and are arranged in an annular shape in plan view. As the beam member 2, square steel pipes, angle steels, channel steels described later, etc. may be used.

[0021] (First Embodiment: Construction Method of Shelter 100) Next, an example of the construction method of the shelter 100 in the first embodiment will be described.

[0022] The construction method of the shelter 100 includes a cylindrical wall body construction step. In the cylindrical wall body construction step, the joint portions 11 and 12 of the side wall members 1 in which the joint portions 11 and 12 are formed at both ends in the short hand direction are connected to construct the cylindrical cylindrical wall body 10. The cylindrical wall body construction step includes a beam member installation step and a cylindrical unit formation step.

[0023] <Beam Member Installation Step> In the beam member installation step, first, the beam member 2 is provided in an annular shape on the ground surface.

[0024] <Cylindrical Unit Forming Process> In the cylindrical unit forming process, the side wall member 1 is fixed to the annular beam member 2 by the fixing member 18. In the cylindrical unit forming process, the joint portion 11 of the fixed side wall member 1 and the joint portion 12 of the new side wall member 1 are connected, and the newly connected side wall member 1 is fixed to the beam member 2 by the fixing member 18. In this way, in the cylindrical wall construction process, the joint portion 11 of the adjacent side wall members 1 and the joint portion 12 of the side wall member 1 are sequentially connected along the annular beam member 2 to form the cylindrical cylindrical unit 7. Thereby, the cylindrical wall 10 provided with the beam member 2 at the lower end portion of the cylindrical unit 7 is constructed.

[0025] Thus, an example of the construction method of the bunker 100 is completed.

[0026] According to the present embodiment, it includes the cylindrical wall 10 formed in a cylindrical shape by connecting the joint portions 11 and 12 of the side wall member 1 to each other. Thereby, a bunker 100 that can stand on its own can be constructed even in the case of strong winds. Further, since the cylindrical wall 10 has a cylindrical closed cross section, there are no dead corners, and shooting in all directions in the circumferential direction and defense against shooting can be achieved.

[0027] Further, according to the present embodiment, it includes the cylindrical wall 10 formed in a cylindrical shape by connecting the joint portions 11 and 12 of the side wall member 1 to each other. Thereby, the bunker 100 can be constructed without using a concrete foundation in a war zone or the like. Also, the side wall members 1 can be connected to each other without using bolts in a war zone or the like. Furthermore, since the side wall members 1 can be connected to each other without using bolts, the bunker 100 is easy to construct even at night. For this reason, the construction of the bunker 100 becomes easy.

[0028] According to the present embodiment, the cylindrical wall 10 further includes a beam member 2 provided at the lower end portion 1a of the side wall member 1. Thereby, the side wall members 1 can be sequentially connected along the beam member 2. For this reason, the construction of the bunker 100 becomes even easier. Also, the shape of the bunker 100 is likely to be stable.

[0029] According to this embodiment, the cylindrical wall body 10 has a fixing member 18 that fixes the side wall member 1 and the beam member 2. As a result, the bunker 100 becomes stronger. Therefore, it can be more resistant to strong winds and gunfire.

[0030] According to this embodiment, the side wall member 1 is a steel sheet pile. As a result, by using commonly available steel sheet piles, the bunker 100 can be constructed with members having stable quality and cross-sectional performance.

[0031] According to this embodiment, the side wall member 1 is a steel sheet pile with a plate thickness of 10 mm or less. As a result, compared with a steel sheet pile with a plate thickness exceeding 10 mm, the steel sheet pile with a plate thickness of 10 mm or less has a margin at the joint part, and the rotatable angle of the joint part is large. Therefore, when constructing the cylindrical wall body 10 having a closed cross-section in plan view, it becomes easier to assemble.

[0032] According to this embodiment, the side wall member 1 is a stainless steel sheet pile. As a result, the corrosion resistance is improved, and it becomes possible to suppress the life cycle cost of the bunker 100.

[0033] (Second Embodiment: Bunker 100) Next, the bunker 100 in the second embodiment will be described. Hereinafter, the same configurations as those in the above-described embodiment will be omitted from the following detailed description. As shown in FIG. 4, in the bunker 100 in the second embodiment, the lower end portion of the cylindrical wall body 10 is buried in the ground, and the upper end portion of the cylindrical wall body 10 is disposed above the ground surface.

[0034] According to this embodiment, the lower end portion of the cylindrical wall body 10 is buried in the ground. As a result, it becomes difficult to visually recognize the bunker 100 from the ground. Therefore, it becomes difficult for the bunker 100 to be found by the enemy.

[0035] Note that in the present invention, all of the bunker 100 may be buried in the ground.

[0036] (Third Embodiment: Bunker 100) Next, the bunker 100 in the third embodiment will be described. As shown in FIG. 5, in this embodiment, the bunker 100 has a beam member 2 provided at the upper end of the cylindrical wall 10.

[0037] (Fourth Embodiment: Bunker 100) Next, the bunker 100 in the fourth embodiment will be described. As shown in FIG. 6, in this embodiment, the bunker 100 has a beam member 2 provided at the upper end and the lower end of the cylindrical wall 10.

[0038] The beam member 2 is made of a channel steel. The beam member 2 may also be an H-shaped steel, an angle steel, or a square steel pipe.

[0039] (Fifth Embodiment: Bunker 100) Next, the bunker 100 in the fifth embodiment will be described. As shown in FIGS. 7 and 8, in the bunker 100 of this embodiment, a plurality of side wall members 1 are provided in the vertical direction, and the beam member 2 is provided between two adjacent side wall members 1 in the vertical direction. The cylindrical wall 10 has two-stage cylindrical units 7-1 and 7-2 that connect the side wall members 1 in a cylindrical shape. The side wall member 1 that constitutes the cylindrical unit 7-1 is defined as the first side wall member 1-1, and the side wall member 1 that constitutes the cylindrical unit 7-2 is defined as the second side wall member 1-2.

[0040] (Fifth Embodiment: Construction Method of Bunker 100) Next, an example of the construction method of the bunker 100 in the fifth embodiment will be described.

[0041] The construction method of the bunker 100 includes a cylindrical wall construction process. Similar to the first embodiment, the construction method of the bunker 100 in the fifth embodiment performs a beam member installation process and a cylindrical unit formation process to form the first-stage cylindrical unit 7-1.

[0042] <Beam Member Installation Process> In the beam member installation process, the beam member 2 is provided in an annular shape at the upper end of the first-stage cylindrical unit 7-1.

[0043] <Cylindrical Unit Formation Process> In the cylindrical unit forming step, the side wall member 1 (second side wall member 1-2) is fixed to the beam member 2 provided annularly on the upper end portion of the first-stage cylindrical unit 7 by the fixing member 18. In the cylindrical unit forming step, the joint portion 11 of the fixed side wall member 1 and the joint portion 12 of the new side wall member 1 are connected, and the newly connected side wall member 1 is fixed to the beam member 2 by the fixing member 18. Thus, in the cylindrical wall body construction step, the joint portion 11 of the adjacent side wall members 1 and the joint portion 12 of the side wall member 1 are sequentially connected along the annular beam member 2 to form the second-stage cylindrical unit 7-2. Thereby, the cylindrical wall body 10 having two stages of cylindrical units 7-1 and 7-2 is constructed.

[0044] Thus, an example of the construction method of the bunker 100 is completed.

[0045] According to the present embodiment, a plurality of side wall members 1 are provided in the vertical direction, and the beam member 2 is provided between two adjacent side wall members 1 in the vertical direction. Thereby, the height of the bunker 100 can be increased.

[0046] (Sixth Embodiment: Bunker 100) Next, the bunker 100 in the sixth embodiment will be described. As shown in FIG. 9, in the bunker 100 in the present embodiment, the beam member 2 provided between two adjacent side wall members 1 in the vertical direction is composed of a first beam member 21 and a second beam member 22.

[0047] The beam member 2 has a first beam member 21 provided at the upper end portion 1b of the first side wall member 1-1, and a second beam member 22 provided at the lower end portion 1a of the second side wall member 1-2 and provided above the first beam member 21. The first beam member 21 and the second beam member 22 are connected to each other by a fixing member such as a bolt (not shown).

[0048] (Seventh Embodiment: Bunker 100) Next, the bunker 100 in the seventh embodiment will be described. As shown in FIG. 10, in the bunker 100 in the present embodiment, a scaffold member 29 is fixed to the beam member 2.

[0049] The side wall member 1 has a first side wall member 1-1 that constitutes the cylindrical unit 7-1 and a second side wall member 1-2 that is spaced upward from the first side wall member 1-1 and constitutes the cylindrical unit 7-2. The lower end 1a of the second side wall member 1-2 of the cylindrical unit 7-2 and the upper end 1b of the first side wall member 1-1 of the cylindrical unit 7-1 are connected by a beam member 2.

[0050] Inside the cylindrical wall body 10, a scaffold member 29 fixed to the beam member 2 is provided. The scaffold member 29 is, for example, a scaffold board and is fixed to the beam member 2 by a fixing member such as a bracket 28.

[0051] (Seventh Embodiment: Method of Constructing the Bunker 100) Next, an example of the method of constructing the bunker 100 in the seventh embodiment will be described. The method of constructing the bunker 100 further includes a scaffold member installation step of installing the scaffold member 29 on the beam member 2 inside the cylindrical wall body 10 after the beam member installation step.

[0052] According to the present embodiment, the cylindrical wall body 10 further includes a scaffold member 29 fixed to the beam member 2. Thereby, it is easy to form the cylindrical unit 7 upward with a person on the scaffold member 29. Therefore, it is possible to improve the workability of the cylindrical wall body 10.

[0053] In the present invention, the scaffold member 29 may be fixed to the outside of the cylindrical wall body 10.

[0054] (Eighth Embodiment: Bunker 100) Next, the bunker 100 in the eighth embodiment will be described. As shown in FIGS. 11 to 13, in the bunker 100 in the present embodiment, an opening S is formed between the first beam member 21 and the second beam member 22 that constitute the beam member 2.

[0055] As shown in FIG. 11, the beam member 2 is installed between the cylindrical unit 7-1 and the cylindrical unit 7-2 in the cylindrical wall body 10. The beam member 2 is, for example, an H-shaped steel. The beam member 2 may be a channel steel, an angle steel, or the like.

[0056] As shown in FIGS. 12 and 13, the beam member 2 includes a first beam member 21 provided at the upper end portion 1b of the first side wall member 1-1, a second beam member 22 provided at the lower end portion 1a of the second side wall member 1-2 and spaced upward from the first beam member 21, and a receiving member 23 provided between the first beam member 21 and the second beam member 22.

[0057] For example, a CT-shaped steel is used for the receiving member 23. A plurality of receiving members 23 are provided at intervals in the circumferential direction. The receiving member 23 may be an angle steel, a channel steel, or the like. The receiving member 23 may be fixed to at least one of the first beam member 21 and the second beam member 22 via a fixing member such as a bolt (not shown). The receiving member 23 may be sandwiched between the first beam member 21 and the second beam member 22 without being fixed by a fixing member. In this case, since the receiving member 23 is simply sandwiched between the first beam member 21 and the second beam member 22, the location of the opening S can be easily moved.

[0058] An opening S is formed between the first beam member 21 and the second beam member 22. The opening S is formed between the receiving members 23 spaced apart in the circumferential direction. The opening S can function as a shooting port for monitoring and shooting at the enemy.

[0059] (Eighth Embodiment: Construction Method of the Bunker 100) Next, an example of the construction method of the bunker 100 in the eighth embodiment will be described.

[0060] The construction method of the bunker 100 includes a cylindrical wall construction step. The construction method of the bunker 100 in the eighth embodiment performs a beam member installation step and a cylindrical unit formation step in the same manner as in the first embodiment to form the first-stage cylindrical unit 7-1.

[0061] <Beam Member Installation Step> In the beam member installation process, a beam member 2 is provided in an annular shape at the upper end of the first-stage cylindrical unit 7-1. When installing the beam member 2, the beam member installation process provides a first beam member 21 provided at the upper end portion 1b of the side wall member 1, a second beam member 22 spaced upward from the first beam member 21, and a receiving member 23 provided between the first beam member 21 and the second beam member 22. The beam member installation process forms an opening S between the first beam member 21 and the second beam member 22.

[0062] <Cylindrical unit forming process> In the cylindrical unit forming process, the side wall member 1 (second side wall member 1-2) is fixed by a fixing member 18 on the beam member 2 (second beam member 22) provided in an annular shape at the upper end of the first-stage cylindrical unit 7-1. In the cylindrical unit forming process, the joint portion 11 of the fixed side wall member 1 and the joint portion 12 of the new side wall member 1 are connected, and the newly connected side wall member 1 is fixed by the fixing member 18 on the beam member 2. In this way, in the cylindrical wall body construction process, the joint portion 11 of the adjacent side wall members 1 and the joint portion 12 of the side wall member 1 are sequentially connected along the annular beam member 2 to form the second-stage cylindrical unit 7-2. Thereby, a cylindrical wall body 10 having two stages of cylindrical units 7-1 and 7-2 is constructed.

[0063] As described above, an example of the construction method of the bunker 100 is completed.

[0064] According to the present embodiment, a beam member 2 provided at the upper end portion 1b of the side wall member 1 is further provided. The beam member 2 has a first beam member 21 provided at the upper end portion 1b of the side wall member 1, a second beam member 22 spaced upward from the first beam member 21, and a receiving member 23 provided between the first beam member 21 and the second beam member 22. An opening S is formed between the first beam member 21 and the second beam member 22. Thereby, the opening S can function as a gunport.

[0065] (Embodiment 9: Bunker 100) Next, the bunker 100 in the ninth embodiment will be described. As shown in FIG. 14, the bunker 100 in the present embodiment includes a beam member 2 provided inside the side wall member 1.

[0066] The beam member 2 is fixed to the central portion in the longitudinal direction of the side wall member 1. The beam member 2 may be supported from below by a support member such as a bracket (not shown) fixed to the inner surface of the cylindrical wall body 10.

[0067] According to the present embodiment, a beam member 2 provided inside the side wall member 1 is provided. Thereby, the cylindrical wall body 10 is strongly reinforced, and the shelter 100 can be constructed more strongly.

[0068] In the present invention, a beam member 2 provided outside the side wall member 1 may be provided.

[0069] (Embodiment 10: Shelter 100) Next, the shelter 100 in the tenth embodiment will be described. As shown in FIGS. 15 and 16, in the shelter 100 in the present embodiment, a straight steel sheet pile is used as the side wall member 1.

[0070] The side wall member 1 has a flat main board portion 13. At both ends in the short side direction of the main board portion 13, C-shaped joint portions 113 and 114 are formed in a sectional view perpendicular to the longitudinal direction. The joint portion 113 of one side wall member 1 and the joint portion 114 of the other side wall member 1 are configured to be fitted and connected to each other. As the side wall member 1, for example, a straight steel sheet pile is used.

[0071] The cylindrical wall body 10 is formed in a cylindrical shape by connecting the joint portions 113 and 114 of the side wall members 1 where the joint portions 113 and 114 are formed at both ends in the short side direction.

[0072] According to the present embodiment, a straight steel sheet pile is used as the side wall member 1. Thereby, by using a generally circulated straight steel sheet pile, it is possible to construct the shelter 100 with members having stable quality and cross-sectional performance.

[0073] (Embodiment 11: Shelter 100) Next, the shelter 100 in the eleventh embodiment will be described. As shown in FIGS. 17 and 18, in the shelter 100 in the present embodiment, the main board portion 13 of the side wall member 1 is formed in a wave shape.

[0074] The side wall member 1 has a corrugated main board portion 13. At both ends of the main board portion 13 in the short side direction, C-shaped joint portions 113 and 114 are formed in a cross-sectional view perpendicular to the longitudinal direction. The joint portion 113 of one side wall member 1 and the joint portion 114 of the other side wall member 1 are configured to be fitted and connectable to each other. As the main board portion 13 of the side wall member 1, for example, a deck plate such as a keystone plate is used, and the joint portions 113 and 114 are joined to both ends of the main board portion 13 by welding or the like.

[0075] As shown in FIG. 18, the cylindrical wall body 10 is formed in a cylindrical shape by connecting the joint portions 113 and 114 of the side wall member 1 in which the joint portions 113 and 114 are formed at both ends of the main board portion 13 in the short side direction.

[0076] According to the present embodiment, the side wall member 1 has the main board portion 13 formed in a corrugated shape. Thereby, by using a product that generally circulates as the main board portion 13, it becomes possible to construct the shelter 100 with a member having stable quality and cross-sectional performance.

[0077] Some embodiments of the present invention have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, the present invention can be implemented in various novel forms in addition to the above embodiments. For example, in the above embodiment, the cylindrical wall body 10 is circular in plan view, but it may be oval, horseshoe-shaped, rectangular, or the like. Therefore, the above embodiments can be variously omitted, replaced, and changed without departing from the gist of the present invention. Such novel forms and modifications are included in the scope and gist of the present invention, and are also included in the scope of the invention described in the claims and the scope of equivalents of the invention described in the claims.

Explanation of Reference Numerals

[0078] 100: Shelter 1: Side wall member 1a: Lower end portion 1b: Upper end portion 7: Cylindrical unit 10: Cylindrical wall 11: Joint part 12: Joint part 13: Main board part 113: Joint part 114: Joint part 18: Fixing member 2: Beam material 21: First beam material 22: Second beam material 23: Receiving material 28: Bracket 29: Scaffold member 9: Embankment part 91: Sandbag S: Opening

Claims

1. Comprising a cylindrical wall body formed by connecting the joint portions of a side wall member having joint portions formed at both ends in the short direction, the joint portions being connected to each other to form a cylindrical shape A bunker characterized by the above.

2. The cylindrical wall body further comprises a beam member provided at at least one of the upper end portion and the lower end portion of the side wall member The bunker according to claim 1, characterized by the above.

3. A plurality of the side wall members are provided in the vertical direction, The beam member is provided between two adjacent side wall members in the vertical direction The bunker according to claim 2, characterized by the above.

4. The bunker according to claim 1 further comprises a beam member provided on at least one of the inner side and the outer side of the side wall member The bunker according to claim 1, characterized by the above.

5. The cylindrical wall body has a fixing member for fixing the side wall member and the beam member The bunker according to claim 4, characterized by the above.

6. The bunker according to claim 2 or 4 further comprises a scaffolding member installed on the beam member on at least one of the inner side and the outer side of the cylindrical wall body The bunker according to claim 2 or 4, characterized by the above.

7. The side wall member is a steel sheet pile The bunker according to claim 1, characterized by the above.

8. The bunker further comprises a beam member provided at the upper end portion of the side wall member, The beam member is, A first beam member provided at the upper end portion of the side wall member, A second beam member spaced upward from the first beam member, And a receiving member provided between the first beam member and the second beam member, and An opening is formed between the first beam member and the second beam member The bunker according to claim 1, characterized by the above.

9. A method for constructing a bunker, comprising a cylindrical wall body construction step of connecting the joint portions of a side wall member having joint portions formed at both ends in the short direction to construct a cylindrical wall body The method for constructing a bunker is characterized by the above.

10. The cylindrical wall body construction step includes a beam member installation step of providing a beam member at at least one of the upper end portion and the lower end portion of the side wall member The method for constructing a bunker according to claim 9, characterized by the above.

11. The cylindrical wall body construction step includes providing a new cylindrical unit on the beam member provided at at least one of the upper end portion and the lower end portion of a cylindrical unit formed by connecting a plurality of the side wall members in a cylindrical shape The method for constructing a bunker according to claim 10, characterized by the above.

12. The cylindrical wall body construction step includes a beam member installation step of providing a beam member on at least one of the inner side and the outer side of the side wall member The method for constructing a bunker according to claim 9, characterized by the above.

13. After the beam member installation step, Further comprising a scaffolding member installation step of installing a scaffolding member on at least one of the inner and outer sides of the cylindrical wall body The method for constructing a bunker according to claim 10 or 12, characterized in that

14. In the beam member installation step, the beam member is provided at the upper end of the side wall member, When providing the beam member, A first beam member provided at the upper end of the side wall member; A second beam member spaced above the first beam member; A receiving member provided between the first beam member and the second beam member, are provided, The beam member installation step includes forming an opening between the first beam member and the second beam member The method for constructing a bunker according to claim 10, characterized in that

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