JP4866264B2 - Underground box - Google Patents

Description

  The present invention forms a laminated structure in which a large number of skeletal members are stacked to hold a space in a box serving as a tank, and the laminated structure is covered with a protective sheet and embedded in the box. The present invention relates to a submerged box for use in a multipurpose disaster prevention water tank.

When the infrastructure for daily life is damaged due to a major earthquake, etc. until the completion of the lifeline restoration work, a disaster prevention tank consisting of a box made of concrete or cast iron, etc. built underground as a water supply facility for emergency measures Is being used.
Conventional disaster prevention water tanks store stored water by building a strong outer wall made of concrete or cast iron, etc., but if a large-scale earthquake exceeding the design seismic intensity required at the time of design suffers, vibrations accompany it. There is a possibility that the outer wall itself is damaged or broken by the inertial force and the ground displacement, and cannot function as an emergency infrastructure due to leakage from the damaged part or the damaged part.
Because these outer walls are large in unit block shape and weight, there are restrictions such as requiring a predetermined area as a construction site, requiring a shape close to a rectangle for the site, and using large heavy machinery for installation work. Was imposed.
Moreover, in the case of a concrete disaster prevention water tank, there is a risk that the surface of the stored water will be damaged by a surface wave of the stored water even during a small and medium-scale earthquake, the ground surface will collapse, and the above ground facilities may be damaged.
On the other hand, for example, in the invention of the laminated structure of Japanese Patent No. 2901959, a structure in which a skeleton member is laminated in a space formed by digging the ground to form a laminated structure is disclosed as an underground water storage structure.
Further, in the invention of the water storage tank of Japanese Patent No. 3710192, a configuration is disclosed in which a space holding skeleton is configured by stacking a plurality of unit skeleton members in the tank space.
Although the laminated structure and the space holding skeleton made of these skeleton members have a certain strength as a whole in the space, damage to a tank or the like in which concrete is placed cannot be prevented.
Japanese Patent No. 2901959 See FIG. Japanese Patent No. 3710192 See FIG.

The present invention has been made in view of the above circumstances, and the main problem is that a box such as a tank in which a laminated structure in which a number of skeleton members are stacked is covered with a protective sheet is built in, and a number of steel frames are provided. A steel box that is composed of connected walls and has high deformation performance, and that can flexibly escape inertial forces from multiple directions during earthquakes by deformation of the box itself. It is to provide.
Another problem of the present invention is that the box is formed by connecting a large number of steel frames, so that it can be appropriately shaped according to the planar shape and area of the installation site, and the unit steel frame is Another object of the present invention is to provide an underground embedment box that can be constructed with small heavy machinery and human power in a short period of time because it is light like the skeleton member.
Further, by attaching an anchor member, it is possible to add a function of resisting buoyancy caused by groundwater or ground liquefaction to the box.

In order to solve the above problem, the invention of claim 1
Covering a built-in laminated structure with a large number of skeleton members covered with a protective sheet, and burying it in the ground,
Each wall surface constituting the underground embedment box is connected with a plurality of divided steel frames by a connecting means capable of absorbing local deformation,
When the external force from various directions such as an earthquake is applied, the box itself is deformed, and the inertial force can be flexibly escaped. The laminated structure in which many skeleton members are stacked is covered with a protective sheet and built in However, in the underground burial box buried in the ground,
Each wall surface constituting the underground embedment box is connected with a plurality of divided steel frames by a connecting means capable of absorbing local deformation,
When an external force from various directions such as an earthquake is applied, the box itself is deformed, and the inertial force can be flexibly escaped.
In the invention of claim 2,
A plurality of bottom steel frames that are connected to each other to form a box bottom wall surface; and a plurality of side steel frames that are connected to each other to form a box side wall surface; A plurality of upper steel frames that are connected to each other to form a box upper wall surface, and connecting beam pieces that connect the side steel frame and the bottom steel frame or the side steel frame and the upper steel frame, It is characterized by comprising corner pillar pieces arranged at the corner portions of the box side wall surface formed of the multiple side steel frames and connecting the different box side wall surfaces to each other.
In the invention of claim 3,
The main part of the connecting means is formed of an engaging structure by latching or fitting.
In the invention of claim 4,
A hole is formed in all or part of the bottom steel frame forming the bottom wall surface, and an anchor member that is driven into the ground is inserted into the hole to fix the underground box.
It can resist buoyancy caused by groundwater and liquefaction during earthquakes.
Furthermore, in the invention of claim 5,
The bottom steel frame has a standing piece portion standing at both ends of the bottom steel frame main body serving as a bottom surface, and a flange surface extending horizontally from the standing piece portion toward the center of the main body,
The flange surfaces of a number of bottom steel frames that form the bottom wall surface of the box are formed on substantially the same horizontal plane,
Before installation of the laminated structure, the unevenness of the installation surface formed by the crushed stone laid under the box bottom wall and the adjustment sand can be eliminated, and the flatness accuracy can be improved.
In the invention of claim 6,
The underground burying box is composed of a box for a multipurpose disaster prevention water tank.

The underground burial box of the present invention has a structure in which a large number of steel frames are connected by connecting means to form a box wall surface, and at least one part of the connecting structure can absorb local deformation. It becomes a flexible structure with high deformation performance against the inertia force during earthquakes from multiple directions where the entire box is an external force.
In addition, if synthetic resin members are used for the many skeleton members incorporated in the box, the individual skeleton members themselves are flexible, and the protective sheet that wraps the laminated structure is also elastic. By using a certain material, the inside of the box has a flexible structure with high deformation performance.
Therefore, when used as a multipurpose disaster prevention water tank, a seismic isolation structure that can avoid directly bearing the inertial force during a huge earthquake is realized regardless of the design seismic intensity level setting. Guaranteed.
It should be noted that the surface wave of the stored water generated during a small-to-medium-scale earthquake can avoid damage to the top wall of the box and depression of the ground surface by the wave-dissipating action of the skeleton member group.
In addition, the steel frame and skeletal members are divided into a large number, and the weight of each single unit is relatively light, so that it can be constructed by manpower except for excavation work, and without using heavy machinery. The construction period can be greatly shortened compared to the storage tank.
In addition, since the skeletal member and the steel frame are compactly divided into a large number, a free three-dimensional shape can be formed, and there are no restrictions on the planar shape or area of the site where the multipurpose disaster prevention water tank is constructed. Can be built.

Compared to conventional concrete and cast iron disaster prevention water tanks, the underground burial boxes are lighter, so the overall weight including the stored water is reduced, but on the other hand, groundwater and ground liquefaction during earthquakes are reduced. It is feared that the entire box will be displaced upward due to the buoyancy caused by the phenomenon, but by penetrating the anchor member into the bottom steel frame, it resists buoyancy and prevents the box from being buried underground, Can be enshrined in.
The penetration length, number and arrangement of the anchor members can be appropriately selected according to the geological situation of the supporting ground.
In addition, the flatness of the bottom laying surface is extremely important in the work of installing the skeletal member in the box, but the flatness of the installation surface formed by crushed stone and adjusting sand can be ensured in the conventional rolling work. Difficult and significantly hinders workability.
Therefore, if flatness is ensured in the bottom steel frame, workability such as rolling and the installation accuracy of the skeleton member can be greatly improved.

  In the present invention, each of the wall surfaces constituting the underground burying box is connected to each other by a connecting means capable of absorbing local deformation, and external forces from various directions such as earthquakes are applied. In this case, the box itself is deformed and the inertial force is flexibly escaped, thereby improving the ease of construction and improving the durability.

Hereinafter, a preferred embodiment in the case of applying the underground burial box of the present invention to the box 4 of the multipurpose disaster prevention water tank 1 will be described with reference to the drawings.
FIG. 1 is a bird's-eye view of an overall structure in which a part of a multipurpose disaster prevention water tank 1 is cut out, and a box 4 embedded in the ground includes a box bottom wall surface 4A constituting the box 4, a peripheral wall, It has a sealed box shape having a box side wall surface 4B and a box upper wall surface 4C.

[Frame members]
In the space formed by the box 4, a laminated structure 20 in which a large number of skeleton members 2 are stacked vertically and horizontally and covered vertically is covered with a protective sheet 3.
Here, the skeleton member 2 only needs to form a single skeleton having a high porosity and water permeability by combining a large number, and as an example, the synthesis disclosed in Japanese Patent Publication No. 4-02648 and Japanese Patent No. 3710192 Although an example using a resin container-like member or a skeleton member has been shown, other known skeleton members such as a skeleton member as described in Japanese Patent No. 2901959 can be used.

In the illustrated example, the skeleton member 2 schematically shown is made of a container-like member made of a synthetic resin and having a water passage hole.
The skeleton member 2 is preferably a synthetic resin because it is lightweight and flexible, but a metal or a hybrid structure of a metal and a synthetic resin can be used as appropriate.

[Bottom steel frame]
Next, the box bottom wall surface 4 </ b> A of the box 4 is formed by connecting the bottom steel frames 41 made of a number of thin steel plates with the connecting means 8.
As shown more clearly in FIGS. 4 and 8 (a), the bottom steel frame 41 has a flat bottom piece 41a that is narrow and extends long, and a pair of vertically suspended vertical ends at both ends thereof. A side piece 41b and an upper flange piece 41c that bends inward at right angles from the upper ends of the pair of side pieces and extends horizontally to a midway position. A gap S is formed between the opposed upper flange pieces 41c. The opening is formed and communicates with the internal space.

In the case of the present embodiment, the bottom piece 41a is set to one of the vertical and horizontal lengths of the box bottom wall surface 4A.
Further, the pair of upper flange pieces 41c substantially form one horizontal plane.

  When assembling the bottom steel frame 41, as shown in FIG. 4, the bottom steel frame (for convenience of explanation, "'" is attached to one symbol) 41, 41' mutual side piece 41b, 41b ′ are stacked without gaps, and the adjacent upper flange pieces 41c and 41c ′ are in contact with each other with no gaps, and similarly, the bottom piece parts 41a and 41a ′ are in contact with each other with no gaps and are on the same plane.

The overlapped side piece portions 41b and 41b ′ are preliminarily formed with bolt holes at a predetermined interval, and are connected by tightening with a nut through a bolt as an example of the connecting means 8.
In this way, the bottom piece portion 41a forms a horizontal bottom surface, and the upper flange piece 41c forms a substantially horizontal plane spaced upward in parallel with the bottom surface.

The bottom piece 41 is provided with a plurality of anchor holes 7 at regular intervals.
In this embodiment, the anchor hole 7 is circular, but the hole may be rectangular or any other shape.
In addition, in the illustrated example, the position of the anchor hole 7 and the position of the bolt hole are arranged so as to be shifted at substantially equal intervals when viewed from the plane. It is not specifically limited, It can design and change suitably according to conditions, such as a use and the geology of the field.

[Connecting means]
The connecting means 8 connects the steel frames 41 to 45 made of thin steel plates, and most of them have a latching or fitting structure so as to cope with the absorption of local deformation at the loosening margin of the connecting portion during compression. It has become.
In addition, a structure such as a connecting bolt or a hook may be partially used in order to ensure stability and safety during the construction within a range not impairing the absorption of the deformation.
The tensile force is due to elastic deformation of the thin steel plates of the steel frames 41 to 45.

[Side steel frame]
Next, the box side wall surface 4 </ b> B of the box 4 is formed by connecting side steel frames 42 made of a large number of thin steel plates to each other by the connecting means 8.
As shown in FIGS. 4 and 8 (b), the side steel frame 42 has a flat side piece portion 42a that is narrow and extends long, and a first side portion that is suspended vertically at one end thereof. The first vertical piece 42b, the second vertical piece 42c extending in parallel to the first vertical piece 42b at the other end, and the first vertical piece 42c are formed at the tip of the second vertical piece 42c. The hook part 42d as an example of the connecting means 8 fitted and locked to the tip of the vertical piece 42b, and the first vertical piece 42b and the second vertical piece 42c are spanned at both upper and lower ends. It consists of a first horizontal piece 42e and a second horizontal piece 42e.
In the case of the present embodiment, the side steel frame 42 is set to the same length as the height of the box side wall surface 4B.

When assembling the side steel frame 42, as shown in FIG. 4, one of the first side steel frames 42, 42 '(for convenience of explanation, one symbol is attached with "'"). The vertical piece 42b and the other second vertical piece 42c ′ are overlapped without any gap, and the side pieces 42a and 42a ′ are arranged in contact with each other with no gap on the same plane.
And hook part 42d 'of said 2nd vertical piece 42c' is externally fitted to said 1st vertical piece 42b, and side steel frames 42 and 42 'are locked together.
As a result, the inner wall surface becomes a flat surface, and the first vertical hanging piece portion 42b and the second vertical hanging piece portion 42c are integrally engaged with the outer wall surface to form protrusions 46 protruding in a fin shape at regular intervals. Is done.

[Upper steel frame]
Next, the box upper wall surface 4 </ b> C of the box 4 is formed by connecting upper steel frames 43 made of a large number of thin steel plates to each other by the connecting means 8.
In the case of the present embodiment, the upper steel frame 43 is set to a length slightly longer than one of the vertical and horizontal lengths of the box 4 and has the same configuration as the side steel frame 42.

  That is, as shown in FIG. 8 (c), a flat upper piece 43a that is narrow and long, a first vertical piece 43b that is vertically suspended at one end, and the other end The second vertical piece 43c that extends in parallel to the first vertical piece 43b, and is formed at the tip of the second vertical piece 43c and is fitted to the tip of the first vertical piece 43b. It consists of a hook part 43d as connecting means 8 to be engaged and locked.

In the present embodiment, the upper piece 43a is parallel to the bottom piece 41a and connected in the same direction.
That is, when assembling the upper steel frames 43 into one substantially plate shape, the upper piece 43a is set to the same horizontal plane and is adjacent to the first vertical piece 43b of one upper steel frame 43. The other vertical steel piece 43c of the other upper steel frame 43 is connected by being hooked with a hook part 43d, and projections 46 'similar to the above are formed at regular intervals.

In the present embodiment, a first end steel frame 51 and a second end steel frame 52 are provided at both ends of the box upper wall surface 4C in the assembly direction.
The first end steel frame 51 is set wider than the upper piece portion 43a and is set to a length that protrudes outward from the box 4 when attached, and the end upper piece portion 51a. It consists of an end first vertical strip 51b that is suspended perpendicularly at one end of 51a.

  Further, the second end upper steel frame 52 is set wider than the upper piece 43a and has an end upper piece 52a set to a length protruding outward from the box 4 at the time of attachment, and the end An end second vertical piece 52b that is vertically suspended at the other end of the upper piece 52a, and an adjacent upper steel frame 43 formed at the tip of the second end vertical piece 52b. And a hook portion 52c fitted and locked to the tip of the first vertical hanging piece portion 43b.

  And, in order to connect the upper steel frame 43 and the first end steel frame 51 or the second end steel frame 52 at the end, one end portion is connected similarly to the connection between the upper steel frames 43. The first vertical piece 51b of the first end steel frame 51 is engaged with the hook portion 43d of the second vertical piece 43c of the upper steel frame 43 of the upper steel frame 43, and the second end upper steel frame 52 is The first vertical piece 43b of the upper steel frame 43 at the other end is locked and connected to the hook part 52c of the second vertical piece 52b.

Thereby, the box upper wall surface 4C is formed (see FIG. 1).
The box upper wall surface 4C has an edge along the outer periphery thereof in contact with and overlaps with the first horizontal piece 42e of the side steel frame 42, and at that portion, a bolt and a nut as the connecting means 8 are used. They are connected by tightening (not shown).

[Link beam]
Next, in the case of the present embodiment, a connecting beam piece 45 made of a thin steel plate is brought into contact with the corner portion extending laterally to connect the box side wall surface 4B and the box bottom wall surface 4A with the connecting means 8 from the inside. Link.
The connecting beam piece 45 is made of a predetermined long angle material whose cross section is formed in a substantially L shape by a vertical piece 45a and a horizontal piece 45b.

  And when connecting box side wall surface 4B and box bottom wall surface 4A, each corner part formed by the inner wall lower side of side steel frame 42 and the upper surface of upper flange piece 43 of bottom steel frame 41 is formed. Along the length of each side, the L-shaped pieces are overlapped without gaps and connected by bolting using bolts and nuts as connecting means 8 (see FIG. 4). .

  In the illustrated example, when the connecting beam piece 45 is arranged in the direction crossing the bottom steel frame 41, the overlapping portion of the horizontal piece 45 b and the upper flange piece 41 c of the bottom steel frame 41 is used as the connecting means 8. The bolts and nuts are connected as the connecting means 8 in two upper and lower stages for each side steel frame 42 at the portion where the vertical piece 45a and the side steel frame 42 overlap each other. It is connected by bolting using

In the above embodiment, the box side wall surface 4B and the box bottom wall surface 4A are connected, but the connecting beam piece 45 is further brought into contact with the corner portion extending laterally between the box side wall surface 4B and the box upper wall surface 4C from the inside. You may connect.
Further, the connecting beam piece 45 may be connected from the inside only to the corner portion extending laterally between the box side wall surface 4B and the box upper wall surface 4C.

[Corner Column]
Further, a corner pillar piece 44 made of a thin steel plate and extending in the vertical direction is interposed between the box side wall surfaces 4B and 4B adjacent to each other at the corner, and the box side wall surfaces 4B and 4B are connected to each other by the connecting means 8. It is the corner of box 4.

  The corner pillar piece 44 has the same height as the side steel frame 42. As shown in FIG. 3, each corner piece 44a has a corner body piece 44a having an angular cross section in which each piece is set to an equal width, and both ends thereof. And a pair of projecting pieces 44b and 44c that bend outward at a right angle.

  In the case of the illustrated example, one projecting piece 44b is spaced from the first vertical piece 42b or the second vertical piece 42c of the side steel frame 42 disposed at the base end of one box side wall surface 4B. Although it comes into contact with each other, when it comes into contact with the second vertical piece 42c, it is fitted and locked by a hook part 42d as the connecting means 8, and when it comes into contact with the first vertical piece 42b, the overlapped part is bolted, etc. These are connected by connecting means 8.

The corner pillar piece 44 can set the length of the corner body piece 44a according to the width of the gap between the side steel frames 42 adjacent to each other at the corner.
When the gap is wide, the corner pillar piece 44 may be provided by sandwiching the auxiliary piece 44 ′ having a channel cross section between the side steel frame 42 (see FIG. 3).
The corner pillar pieces 44 are connected together with the side steel frames 42 by the connecting beam pieces 45 by bolting as connecting means 8.

[Construction method]
Therefore, the box first digs the ground to provide a recess, lays the crushed stone 5 on the bottom surface, and lays the adjustment sand 15 on the ground to level the bottom surface of the recess to a flat installation surface.
On top of this, the box bottom wall surface 4A is assembled and placed, and on the box bottom wall surface 4A, a bag-like protective sheet 3, which is a storage layer in this embodiment, has water resistance such as a rubber sheet. The sheet 3 is placed.

Here, when water is infiltrated, all or part of the protective sheet may be made of a water-permeable material according to the application.
The protective sheet 3 is filled with the skeleton member 2 to assemble the laminated structure 20, and the box side wall surface 4B is assembled along the outer periphery of the box bottom wall surface 4A.
Then, the box bottom wall surface 4 </ b> A and the box side wall surface 4 </ b> B are connected using the connecting beam piece 45.
To do.

When the laminated structure 20 is assembled in the protective sheet 3, in this embodiment, the protective sheet 3 covers and seals the upper surface of the laminated structure 20.
Then, the box body upper wall surface 4C is assembled, overlapped on the box side wall surface 4B and connected to each other, the box body 4 is assembled, and the recesses are backfilled with the backfilling soil 6, thereby the laminated structure 20 A multipurpose disaster prevention water tank in which a box 4 sealed with a protective sheet 3 is buried in the ground is completed.
In this invention, as shown in FIG. 7, the upper flange piece serving as an installation surface when stacking the skeleton members 2 by laying the bottom steel frame 41 directly after laying the crushed stone 5 or via the adjusting sand 15. Since the flatness 16 of the group 41c can be adjusted as close to the horizontal plane as possible, the assembly accuracy of the laminated structure 20 can be improved.

Since the shape of the box 4 is composed of a combination of the steel frames, it is not limited to a simple box shape, and a corner portion may be provided at any location in the vertical direction and the outer peripheral direction and bent to be assembled into a desired shape. The shape can be adapted to the construction site.
The cross-sectional view of FIG. 2 and the plan view of FIG. 3 show an embodiment in the case where a shape constraint is imposed on the construction site.

[Seismic isolation and wave extinguishing functions]
Since the box 4 is configured as described above, each of the wall surfaces 4A to 4C is formed by connecting a large number of divided steel frames 41 to 43 and pieces 44 and 45 by the connecting means 8, and the connection location thereof. 5 is capable of absorbing local deformation, the box 4 is compatible with the flexibility of the laminated structure 20 composed of the skeleton member 2 and the stretchability of the protective sheet 3 as shown in the image diagram of FIG. Thus, by flexibly deforming with respect to the inertial force 11 caused by an earthquake having a design seismic intensity or higher, the stored water can be secured without the box 4 being destroyed.
Moreover, the surface wave 10 of the stored water produced at the time of a small and medium-sized earthquake can also be extinguished by the buffer of a frame member group.

[Uplift prevention function]
In this embodiment, the anchor member 12 has a function of preventing the buoyancy of the box 4 due to the groundwater or ground liquefaction phenomenon.
As described above, the bottom steel frame 41 is provided with the hole 7 for installing the anchor member 12 for preventing lifting (see FIG. 4).
The hole 7 is a circular hole, and the anchor member 12 illustrated in FIG. 6 is driven into the ground.

[Anchor member]
The anchor member 12 is set to have a smaller diameter than the hole 7 of the bottom steel frame 41, and is connected to the base end of the blade edge 12a with the same diameter as the steel rod edge 12a of the steel bar provided at the tip and the steel bar of the blade edge 12a. One or a plurality of resin rods 12b, a steel retaining rod 12d having the same diameter as that of the rod 12b and connected to the uppermost rod 12b, and a connecting pipe 12c for connecting the cutting edge 12a and the rods 12b and 12d. It is made up of.

The retaining rod 12d is engraved with a screw at the upper part, and is connected to the uppermost rod 12b via a connecting pipe 12c at a portion inserted below the hole 7, and above the hole 7, from the hole 7. The nut-shaped stopper set to a large diameter is screwed or fixed with a nut to prevent the anchor member 12 from falling off.
The anchor member 12 can be appropriately set in length by determining the number of rods 12b to be connected according to the geology.

The blade tip 12a and the rod 12b are integrally formed with screw-like blades on the outer periphery.
Therefore, each of the anchor members 12 appropriately arranged as shown in FIG. 6 can resist the acting buoyancy by forming the conical shear surface 13 with respect to the lower and surrounding soil.

In this embodiment, each of the steel frames 41 to 43 forming the box is divided into wall surfaces and connected to each other by the connecting beam piece 44 and the corner pillar piece 45, but the shape is limited to the above embodiment. Not.
In addition, the anchor member has a divided structure, and the connecting rod 12b and the connecting pipe are made of synthetic resin, so that the weight can be further reduced and the workability can be improved. It is not limited and all may be a metal.

Further, in the illustrated example, the anchor hole 7 is provided in the bottom piece 41a of the bottom steel frame 41. However, the present invention is not particularly limited, and the bottom piece extends outward. You may make it mount | wear with an anchor member by forming a hole in a location.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

It is a bird's fine view of the Example at the time of applying this invention to a multipurpose disaster prevention water tank. It is sectional drawing of the multipurpose disaster prevention water tank provided in the site with restrictions. It is a plane | planar arrangement | positioning figure of the bottom part steel frame of the multipurpose disaster prevention water tank provided in the site with other restrictions. It is sectional drawing which shows the bottom part corner of a box, (a) is the figure seen from the plane, (b) is a longitudinal cross-sectional view. It is a deformation | transformation image figure of the flexible structure of the multipurpose disaster prevention water tank at the time of an earthquake. The example of an anchor member for raising prevention and a shear resistance surface is shown. It is a figure which shows the example which improves the flatness precision of a box installation surface with a bottom part steel frame. (A) is a sectional side view showing the connected state of the bottom steel frame, (b) is a sectional side view showing the connected state of the side steel frame, and (c) is a sectional side view showing the connected state of the upper steel frame. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multipurpose disaster prevention water tank 2 Frame member 3 Protection sheet 4 Box 4A Box bottom wall surface 4B Box body side wall surface 4C Box body top wall surface 5 Crushed stone 6 Backfill soil 7 Anchor hole 8 Connection means 10 Surface wave 11 of stored water 11 Horizontal direction Inertial force 12 during earthquake in vertical direction 12 Lifting prevention anchor member 12a Anchor member steel rod cutting edge 12b Anchor member resin rod 12c Anchor member connection pipe 12d Anchor member steel threaded portion 13 Conical shearing against lifting Resistance surface 15 Adjustment sand 16 Unevenness and flatness of installation surface at the time of installation of skeleton member group 20 Laminated structure 41 Bottom steel frame
42 Side steel frame 43 Upper steel frame 44 Corner column piece 45 Connecting beam piece

Claims (6)

Covering a built-in laminated structure with a large number of skeleton members covered with a protective sheet, and burying it in the ground,
Each wall surface constituting the underground embedment box is connected with a plurality of divided steel frames by a connecting means capable of absorbing local deformation,
A box for underground embedment characterized in that, when external forces such as earthquakes are applied, the box itself is deformed to flexibly escape inertial force.   A plurality of bottom steel frames that are connected to each other to form a box bottom wall surface, and a plurality of side steel frames that are connected to each other to form a box side wall surface, A number of upper steel frames that are connected to form a box upper wall; and connecting beam pieces that connect the side steel frame and the bottom steel frame or the side steel frame and the upper steel frame; and 2. The underground according to claim 1, comprising corner pillar pieces arranged at corner portions of the box side wall surface formed of a large number of side steel frames and connecting different box side wall surfaces to each other. A box for burial.   2. The underground burying box according to claim 1, wherein a main part of the connecting means has an engaging structure by hooking or fitting. A hole is formed in all or part of the bottom steel frame forming the bottom wall surface, and an anchor member driven into the ground is inserted into the hole to fix the underground box.
The underground burial box according to claim 1, which can resist buoyancy caused by groundwater or a liquefaction phenomenon during an earthquake. The bottom steel frame has a standing piece that stands at both ends of the bottom steel frame main body that becomes the bottom, and a flange surface that extends horizontally from the standing piece toward the center of the main body,
The flange surfaces of a number of bottom steel frames that form the bottom wall surface of the box are formed on substantially the same horizontal plane,
The flatness can be improved by eliminating the uneven state of the installation surface formed by the crushed stone laid under the box bottom wall and the adjustment sand before the installation of the laminated structure. Box for underground burial.   The underground burial box according to claim 1, wherein the underground burial box comprises a box for a multipurpose disaster prevention water tank.

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