JP6931754B2 - Protective skeleton and its construction method - Google Patents

Description

According to the present invention, for example, a protective skeleton and a method for constructing a protective skeleton for burying a laterally cylindrical tank for storing a fluid such as a fuel storage tank for storing a flammable liquid belonging to Class 4 dangerous goods in the ground. Regarding.

For example, in order to bury a fuel storage tank in the ground, it is stipulated that it be protected by a protective skeleton and buried. As such a protective skeleton, as described in Patent Document 1, there is a protective skeleton made of precast concrete in which a concrete skeleton member manufactured at a factory is assembled on site.

Such a protective skeleton made of precast concrete includes a bottom deck on which the tubular tank is placed, an upper deck placed on the upper part of the tubular tank, and lateral sides of the tubular tank on the bottom deck. It is composed of a plurality of columns supporting the upper deck, and a plurality of deck members are arranged in the length direction and connected to form an upper deck.

Further, in the protective skeleton made of precast concrete as described in Patent Document 1, the floor slab members are joined to the columns, and the floor slab members are connected to each other to form an upper floor slab, and the protective skeleton is assembled and then buried. In order to return the concrete, if a backfilling defect occurs such that the area directly under the upper deck cannot be backfilled, the protective function of the tank by the protective skeleton may be impaired.

Japanese Unexamined Patent Publication No. 5-98657

Therefore, an object of the present invention is to provide a protective skeleton capable of reliably protecting a tubular tank buried in the ground and a method for constructing the protective skeleton.

This invention provides a method for constructing a protected precursor for protecting the lateral cylindrical tank buried in the ground, the bottom floor plate placement step of placing the bottom slab made of precast concrete, the upper portion floor on the bottom deck A support / tank installation process for installing a plurality of precast concrete columns supporting the plate and the tubular tank, a backfilling process for backfilling the circumference of the tubular tank to the lower surface position of the upper deck, and In the upper part of the tubular tank, a plurality of deck members are arranged, the deck members are connected to each other, and the upper deck is joined to the upper part of the support column to form the upper deck. are performed by the order, the struts reinforcement inside of the member edge, disposed one by one in each in the width direction of both sides of each deck member constituting the upper deck is a beam structure reinforcement It is characterized by that.

Further, the present invention is a protective skeleton that protects a laterally oriented tubular tank buried in the ground, and is arranged on a precast concrete bottom deck on which the tubular tank is placed and an upper portion of the tubular tank. It is composed of a precast concrete upper deck and a plurality of precast concrete columns arranged on the side of the tubular tank on the bottom deck and supporting the upper deck. The deck and the upper deck are configured by connecting a plurality of deck members arranged along the length direction of the tubular tank, and each deck member constituting the upper deck is composed of. It is characterized in that it is joined to the upper part of the support column arranged on each side in the width direction, supported by the support column, and the internal reinforcement at the member edge portion of the upper deck is a beam structure reinforcement arrangement .

The above-mentioned "horizontal tubular tank" is not only a circular cross section but also a cylindrical cross section having an appropriate cross section such as a polygonal cross section such as an octagonal cross section. A tank installed so that the length direction is horizontal.
The above "up to the lower surface position of the upper floor slab" is the position of the bottom surface of the upper floor slab, and is not only the same position as the lower surface position, but also slightly with respect to the lower surface position if the height is adjusted before installing the floor plate member. It may be a reserved position or an exceeded position.

The above-mentioned "backfilling step of backfilling the circumference of the tubular tank to the lower surface position of the upper deck" may be backfilled to the lower surface position of the upper deck in a single step or backfilled in a plurality of steps. May be good. Further, the circumference of the tubular tank may be backfilled with the same backfill material up to the lower surface position of the upper deck. It may be backfilled with a plurality of types of backfilling materials, such as backfilling with a backfilling material.
As for the method for constructing the protective skeleton, if the above steps are performed in this order, another step may be performed before and after each step.

According to the present invention, it is possible to construct a protective skeleton capable of reliably protecting a tubular tank buried in the ground.
More specifically, after installing the bottom deck made of precast concrete, a plurality of precast concrete columns supporting the upper deck and the tubular tank are installed on the bottom deck. After the circumference of the tubular tank is backfilled to the lower surface position of the upper deck, a plurality of deck members are arranged on the upper part of the tubular tank to connect the deck members to each other and to support the support. Since the upper deck is joined to the upper part to form the upper deck, the area directly under the upper deck can be reliably backfilled. Therefore, it is possible to prevent deterioration of the protection function due to the protective skeleton due to poor backfilling directly under the upper deck, and to reliably protect the tubular tank.

Further, after the circumference of the tubular tank is backfilled to the lower surface position of the upper deck, a plurality of deck members are arranged on the upper part of the tubular tank to connect the deck members to each other. Since the upper floor slab is formed by joining to the upper part of the support column, the work of connecting the floor slab members and the work of joining the upper end portion of the support column and the upper floor slab are no longer work at heights and are safe and stable. The upper floor slab can be constructed.

Furthermore, after the circumference of the tubular tank is backfilled to the lower surface position of the upper deck, a plurality of deck members are arranged on the upper part of the tubular tank to connect the deck members to each other. Because the upper floor slab is formed by joining to the upper part of the support column, that is, because the tubular tank is protected by a backfill material, the work of connecting the floor slab members to each other and the upper end portion of the support column The upper deck can be safely constructed without damaging the tubular tank by the joining work with the upper deck.

Also, the struts, because they are placed one on each in the width direction of both sides of each deck member constituting the upper bed plate, compared with the case of arranging the respective four corners of the deck member and the strut Therefore, since a space can be secured between the support column arranged on the side of the tubular tank and the tubular tank, the lower part of the tubular tank can be reliably backfilled. Therefore, it is possible to prevent damage to the tubular tank due to poor backfilling below the tubular tank and to reliably protect the tubular tank.

Compared to the case where the floor slab member is joined to the columns arranged at the four corners, the case where the floor slab member is joined to the support column arranged one by one on both sides in the width direction of each deck member constituting the upper floor slab. Although it tends to be unstable in the length direction with respect to the support column, a plurality of deck members are arranged on the upper part of the tubular tank after the circumference of the tubular tank is backfilled to the lower surface position of the upper deck. , Because the floor slab members can be connected to each other while being joined to the support column, that is, a plurality of floor slab members can be arranged on the backfill surface to be joined to the support column and the floor slab members can be connected to each other. , Can be installed safely in a stable state.

Further, since the internal reinforcement at the member edge of the upper deck is a beam structure reinforcement, the member edge of the upper deck straddling the columns can form a beam structure, so that the side surface of the protective skeleton Since at least the portal structure can be formed by at least the support column and the member edge portion of the upper floor slab, it is possible to form a protective frame having a strong frame structure as if it were a frame structure.

In addition to the upper deck, the internal reinforcement at the member edge of the bottom deck may be composed of beam-structured reinforcement. In this case, the frame structure can be formed by the member edge portion of the bottom floor slab in addition to the support column and the member edge portion of the upper deck, and a protective skeleton having higher strength can be formed.

Further, as an aspect of the present invention, the bottom floor slab is configured by arranging a plurality of floor slab members and connecting the floor slab members to each other, and the bottom floor slab and the floor slab members in the upper floor slab are connected to each other. The connection positions of are equal.
According to the present invention, since the positions of the columns can be aligned in the length direction of each floor slab member constituting the bottom floor slab and the upper floor slab, a protective skeleton having a stable strength can be constructed.

Further, as an aspect of the present invention, a plurality of deck members constituting the bottom deck may be integrated by means of integration.
According to the present invention, a plurality of floor plate members constituting the bottom floor plate can be integrated to form a solid bottom floor plate by the integrating means.

The above-mentioned integrating means is applied to a steel member fixed across both floor plate members at a connecting portion between floor slab members, a joint member connecting the reinforcing bars constituting the floor plate member, or a plurality of floor plate members. It may be a PC steel material on which prestress acts.

Further, as an aspect of the present invention, in the support column / tank installation step, the installation posture of the support column with respect to the bottom floor slab may be adjusted by the adjusting means.
The "posture installation posture" refers to the height, orientation, and inclination of the strut with respect to the bottom deck.
According to the present invention, the support column can be accurately installed on the bottom floor slab.

Further, as an aspect of the present invention, at least the lower portion of the support column is formed of a polygonal cross section equal to or higher than a circular cross section having the required strength, and the side surface of the support column formed of the polygonal cross section in the support column / tank installation step. As shown in the above, the installation posture of the support column with respect to the bottom floor slab may be adjusted by the adjusting means.

The above-mentioned "required strength" is the strength required as a support column constituting the protective skeleton, and the above-mentioned "circular cross section having the above-mentioned necessary strength" is a circular cross-sectional shape formed as a support column satisfying the required strength. The "polygonal cross section equal to or higher than the circular cross section having the required strength" is a cross-sectional shape having the same or higher strength as the column having a circular cross section satisfying the required strength, and has many cross sections such as square, hexagon, and octagon. A square cross section.

Further, the above-mentioned "consisting at least the lower part of the support column with a polygonal cross section equal to or higher than a circular cross section having the required strength" means that only the lower part in the height direction is formed of a polygonal cross section and the upper part is circular. It shall include a strut having a substantially circular cross section having a flat surface in a part in the circumferential direction, and a strut having a polygonal cross section in the entire height direction.

The polygonal cross section of the support column may be configured with a constant cross-sectional size in the height direction, or may be configured in a tapered shape in which the cross-sectional size gradually decreases in the height direction.
Further, in the case of a column having a substantially circular cross section in which only the lower portion in the height direction is composed of a polygonal cross section and the upper portion has a plane in a part in the circumferential direction, the side surface of the lower polygonal cross section and the upper substantially circular cross section. A continuous surface may be formed by a side surface formed by a plane in a part in the circumferential direction.

According to the present invention, the support column having the required strength can be installed with higher accuracy. More specifically, a plurality of columns having at least a lower portion having a polygonal cross section equal to or higher than a circular cross section having the required strength, for example, one side surface extending in the height direction directed in the direction along the length direction. When installed, the plurality of columns are installed more accurately by adjusting the installation posture so as to form a virtual plane by one side surface extending in the height direction of the plurality of columns when viewed from the length direction. be able to.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a protective skeleton capable of reliably protecting a tubular tank buried in the ground and a method for constructing the same.

A perspective view of the tank protection frame. Explanatory drawing of the tank protection skeleton. Explanatory drawing of the tank protection skeleton. Explanatory drawing of the precast support. Explanatory drawing of precast floor slab member. Flowchart of how to build a protective skeleton. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing about a filling process. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing of how to construct a protective skeleton. Explanatory drawing of the precast assembly bottom deck of another embodiment. Explanatory drawing of the precast assembly bottom deck of another embodiment. Explanatory drawing of the precast assembly bottom deck of another embodiment.

A method of constructing a protective skeleton 10 and a protective skeleton 10 for protecting a laterally cylindrical cylindrical oil tank 1 for storing flammable liquids belonging to the fourth category of dangerous goods in the ground will be described below together with drawings.

FIG. 1 shows a perspective view of the tank protection skeleton 10, FIGS. 2 and 3 show an explanatory view of the tank protection skeleton 10, FIG. 4 shows an explanatory view of the precast support column member 40, and FIG. 5 shows a precast floor slab member 21. , 31 are shown, FIG. 6 shows a flowchart of a method of constructing the protective skeleton 10, FIGS. 7 to 10 and 12 to 13 show explanatory views of a method of constructing the protective skeleton, and FIG. 11 is a filling step. An explanatory diagram of the above is shown.

More specifically, FIG. 2A shows a plan view of the protective skeleton 10, FIG. 2B shows an arrow view of aa in FIG. 3A, and FIG. 3A shows a tank protective skeleton 10. 3 (b) shows an enlarged side view. FIG. 4 (a) shows a perspective view of the precast support column member 40, and FIG. 4 (b) shows a view taken along the line bb, a view taken along the line cc, and a view taken along the line dd in FIG. 4 (a). It is shown in order from.

Further, FIG. 4C shows a front view before joining the upper joining member 32 of the precast deck member 31 and the upper end portion of the precast strut member 40, and FIG. 4D shows the precast deck member 31. The front view of the joined state between the upper joining member 32 and the upper end portion of the precast strut member 40 is shown, and FIG. 4 (e) shows joining the lower joining member 22 of the precast deck member 21 and the lower part of the precast strut member 40. FIG. 4 (f) shows a front view of the joint state between the lower joint member 22 of the precast deck member 21 and the lower portion of the precast strut member 40.

5 (a) shows a perspective view of the precast deck member 31, FIG. 5 (b) shows a perspective view of the precast deck member 21, and FIG. 5 (c) constitutes the precast assembled decks 20 and 30. The schematic bar arrangement diagram in the plane direction of the precast deck members 21 and 31 is shown, and FIG. 5 (d) shows the schematic bar arrangement diagram in the front direction of the precast deck members 21 and 31.

FIG. 6 shows a flowchart of a method for constructing the protective skeleton 10, FIG. 7 (a) shows a perspective view of the excavation / flooring completed state, and FIG. 7 (b) shows a perspective view of the crushed stone / foundation concrete construction completed state. 8 (a) shows a perspective view of the precast assembled bottom floor slab 20 in an installed / connected state, and FIG. 8 (b) shows a perspective view of the precast assembled bottom floor slab 20 in an installed completed state.

FIG. 9A shows a perspective view of the support member 50 in a completed installation state, FIG. 9B shows a perspective view of the cylindrical oil tank 1 in a completed installation state, and FIG. 10A shows a perspective view of the precast support member 40. A perspective view of the built-in completed state is shown, FIG. 10B shows a perspective view of the primary backfilling / rolling compaction completed state, and FIG. 11A is an outline of a state in which the upper joining member 32 is filled with the filler F. A cross-sectional view is shown, FIG. 11 (b) shows a schematic cross-sectional view of a state in which the adjustment space S is filled with the filler F, and FIG. 12 (a) shows a perspective view of a state in which the secondary backfilling / rolling compaction is completed. FIG. 12B shows a perspective view of the precast assembled upper deck 30 in an installed / connected state, and FIG. 13 shows a perspective view of the protective skeleton 10 in a completed construction state.

The protective skeleton 10 that protects the cylindrical oil tank 1 buried in the ground is roughly a precast assembly bottom deck 20 (hereinafter referred to as Pca assembly bottom deck 20) on which the cylindrical oil tank 1 is placed and a cylindrical oil. A precast assembly upper deck 30 (hereinafter referred to as Pca assembly upper deck 30) arranged above the tank 1 and a plurality of precast strut members 40 (hereinafter referred to as Pca strut member 40) supporting the Pca assembly upper deck 30. ) And.

The cylindrical oil tank 1 for storing fluids such as flammable liquids belonging to the fourth category of dangerous goods is a laterally cylindrical fuel storage tank. Specifically, the cylindrical oil tank 1 is outside a steel underground storage tank. Is composed of a steel reinforced plastic double-shell tank covered with reinforced plastic at predetermined intervals. An lubrication port 2, a vent port 3, and a leak detection unit 4 are provided on the upper portion of the laterally cylindrical cylindrical oil tank 1 at predetermined intervals.

The cylindrical oil tank 1, which is a double-shell tank made of steel reinforced plastic, needs to be protected by a protective skeleton whose structure is defined by public building equipment construction standards and the like, and buried in the ground. That is, the protective skeleton 10 described later is configured to have a structure that satisfies these provisions such as public building equipment construction standards.

Further, in the description of the present embodiment, the longitudinal direction (horizontal direction in FIG. 2) of the cylindrical oil tank 1 which is laterally cylindrical, that is, the cylindrical height direction is defined as the longitudinal direction L, and the laterally cylindrical cylindrical oil. The depth direction of the tank 1 (left-right direction in FIG. 3B), that is, the cylindrical horizontal radial direction is the width direction W, and the cylindrical lead diameter direction forming the cylindrical oil tank 1 is the height direction H.

The Pca assembled bottom floor slab 20 is a plan-view rectangular floor slab whose length direction L is longer than the width direction W and is slightly larger than the plan-view size of the cylindrical oil tank 1, and is a plurality of precast floor slab members 21 (hereinafter referred to as the following). The Pca deck member 21) is arranged along the length direction L, and the Pca deck members 21 and 21 are connected to each other. In addition, in this embodiment, the Pca assembly bottom floor slab 20 is configured by connecting five Pca floor slab members 21.

The Pca deck member 21 is a plan view rectangular floor slab member having a width direction W longer than the length direction L and a length in the width direction W larger than the plan view width direction size of the cylindrical oil tank 1, and has a length. Of a plurality of Pca deck members 21 arranged in the longitudinal direction L, a portion facing the Pca deck member 21 adjacent to the length direction L is connected to the Pca deck member 21 adjacent to the length direction L. It includes a connecting member 25.

Further, at the center of the Pca floor slab member 21 in the length direction L, the lower joining member 22 for joining with the lower end of the Pca support member 40 arranged on the Pca assembly bottom floor slab 20 is provided on both sides of the upper surface in the width direction W. It is provided near the edge of the. As shown in FIGS. 4 (e) and 5 (b), the lower joining member 22 has a building adjustment fitting 23 arranged at the center and a building adjusting fitting 23 at the joint with the lower portion of the Pca support member 40. It is composed of four adjusting screw reinforcing bars 24 planted at predetermined intervals in the length direction L and the width direction W.

Of the four adjusting screw reinforcing bars 24, the two adjusting screw reinforcing bars 24a planted at a predetermined interval in the width direction W with respect to the built-in adjusting metal fitting 23 are separated by a predetermined interval in the length direction L. It is shorter than the two adjusting screw reinforcing bars 24b that have been planted.

Further, in the Pca floor slab member 21, among the reinforcing bars 26 internally arranged, the reinforcing bars 26 at the member edges are beam-structured reinforcing bars (FIG. 5 (c)) as shown in FIGS. 5 (c) to 5 (e). And (e), the reinforcing bar of the area X surrounded by the broken line).

The Pca assembly upper deck 30 is a plan view rectangular floor slab having a length direction L longer than the width direction W, one size larger than the plan view size of the cylindrical oil tank 1, and the same size as the Pca assembly bottom floor slab 20. There, a plurality of precast deck members 31 (hereinafter referred to as Pca deck members 31) are arranged along the length direction L, and the Pca deck members 31, 31 are connected to each other. In addition, in this embodiment, the Pca assembly upper floor slab 30 is configured by connecting five Pca floor slab members 31.

The Pca deck member 31 has a width direction W longer than the length direction L, a length in the width direction W larger than the plan view width direction size of the cylindrical oil tank 1, and the same size as the Pca deck member 21. It is a floor slab member having a rectangular shape in a plan view, and is located in a portion facing the Pca floor slab member 31 adjacent to the length direction L among a plurality of Pca floor slab members 31 arranged in the length direction L in the length direction L. A connecting member 34 for connecting with the adjacent Pca deck member 31 is provided.

Further, at the center of the Pca floor slab member 31 in the length direction L, the upper joining member 32 for joining with the joining screw reinforcing bar 43 provided on the upper end surface of the Pca support member 40 arranged on the Pca assembly upper floor slab 30 is provided. , It is provided near the edges on both sides in the width direction W on the upper surface. As shown in FIG. 4C, the upper joining member 32 is inserted together with the joining screw reinforcing bar 43 provided on the upper end surface of the Pca strut member 40 at the joining portion with the upper end portion of the Pca strut member 40. It is configured to be internally screwed and joined to the joint screw reinforcing bar 43.

Further, in the Pca deck member 31, among the reinforcing bars arranged inside, the reinforcing bars 33 at the member edges are the beam structure reinforcing bars (FIGS. 5 (c) and 5 (c) and as shown in FIGS. 5 (c) to 5 (e). (E), it is composed of the reinforcing bars of the area X surrounded by the broken line).
Further, in the Pca assembly upper deck 30, the Pca floor slab member 31 constituting the lubrication port 2, the vent 3, and the leak detection unit 4 of the cylindrical oil tank 1 has the lubrication port 2, the vent 3, and the Pca floor slab member 31. A manhole 35 that communicates with the leak detection unit 4 is provided.

The plurality of Pca floor slab members 31 may be configured to have the same length in the length direction L, but in the case of the present embodiment, as described above, the lubrication port 2 of the cylindrical oil tank 1 Since the manhole 35 is provided at a location corresponding to the vent 3 and the leak detection unit 4, the Pca deck member 31 is configured with a length corresponding to the position of the manhole 35. Therefore, although the lengths of the Pca deck members 31 are different from each other, they have the same length as the length L of the corresponding Pca deck member 21 in the height direction H, that is, correspond to the height direction H. The Pca deck member 31 and the Pca deck member 21 are formed to have the same size.

The Pca strut member 40, which is installed on the upper surface of the Pca assembly bottom deck 20 and supports the Pca assembly top deck 30, is a columnar body slightly higher than the height H in the height direction of the cylindrical oil tank 1 which is a laterally cylindrical shape. It is composed of a lower octagonal portion 41 about 1/3 lower in the height direction H and an upper substantially circular portion 42 having a substantially circular cross section above the lower octagonal portion 41.

Further, in the lower octagonal portion 41, an attitude adjusting unit that adjusts the installation posture of the Pca strut member 40 with respect to the Pca assembled bottom floor slab 20 in the installed state in cooperation with the lower joining member 22 of the Pca assembled bottom floor slab 20 described above. 44 is provided, and a joining screw reinforcing bar 43 for inserting and joining the upper joining member 32 of the above-mentioned Pca assembly upper deck 30 is provided on the upper end surface of the Pca support member 40.

More specifically, the upper substantially circular portion 42 is a substantially circular cross section having strength capable of supporting the upper Pca assembly upper deck 30 and the loading load, and is a flat side surface portion in which a part of the outer peripheral surface is flat. It has 42a. Two joining screw reinforcing bars 43 are planted along the length direction L on the upper end surface of the upper substantially circular portion 42 configured in this manner at a predetermined interval from the center.

The joint screw reinforcing bar 43 may be provided in advance on the upper end surface of the upper substantially circular portion 42 (Pca strut member 40), but the female anchor is previously provided on the upper end surface of the upper substantially circular portion 42 (Pca strut member 40). May be provided so that the joining screw reinforcing bar 43 is attached when joining with the Pca floor slab member 31 (Pca assembled upper floor slab 30).

The lower octagonal portion 41 is an octagonal cross section having a strength equal to or higher than that of the upper substantially circular portion 42, which is a substantially circular cross section having a strength capable of supporting the upper Pca assembly upper deck 30 and the loading load. A part of the side surface is continuous with the flat side surface portion 42a of the upper substantially circular portion 42 to form the flat side surface 45. Further, a sponge-shaped cushioning material 46 is provided at the lower end of the lower octagonal portion 41, and the bottom surface of the lower octagonal portion 41 forms an adjustment space S that is concave upward.

The attitude adjusting portions 44 for adjusting the installation posture with respect to the Pca assembled bottom deck 20 in cooperation with the lower joining member 22 of the Pca assembled bottom deck 20 are arranged at predetermined intervals in the length direction L and the width direction W, respectively. It is composed of an insertion hole 441 in which the four adjusting screw reinforcing bars 24 are inserted from the bottom surface of the Pca support member 40, and a fixing hole 442 in which the adjusting screw reinforcing bar 24 and the nut are screwed and fixed at the upper part of the insertion hole 441. There is.

The fixing holes 442a screwed into the two adjusting screw reinforcing bars 24a planted at a predetermined interval in the width direction W are the two adjusting screws planted at a predetermined interval in the length direction L. It is provided at a position lower than the fixing hole 442b screwed with respect to the reinforcing bar 24b. That is, since the fixing holes 442a and the fixing holes 442b are located at different positions in the height direction, the rigidity of the Pca support member 40 is suppressed from being lowered by providing the fixing holes 442.

Further, the bottom surface of the lower octagonal portion 41 (Pca strut member 40) that comes into contact with the building adjustment fitting 23 constituting the lower joining member 22 has the height of the Pca strut member 40 adjustable by the building adjusting fitting 23. However, since it is formed of an upwardly concave curved surface so as to form the adjustment space S, the height can be adjusted even when the inclination is adjusted by using the adjustment screw reinforcing bar 24.

The Pca strut members 40 configured in this way are installed on both sides in the width direction W at the center of the length direction L with respect to the Pca floor slab members 21 and 31 constituting the Pca assembled decks 20 and 30. That is, two Pca strut members 40 are installed for one Pca floor slab member 21, 31, and for Pca assembled floor slabs 20, 30 configured by connecting a plurality of Pca floor slab members 21, 31. , The number of Pca support members 40, which is twice the number of Pca floor slab members 21, 31 is installed. Therefore, in the present embodiment in which the five Pca floor slab members 21 and 31 are connected to form the Pca assembled deck members 20 and 30, five Pca support members in the length direction L near the side portion in the width direction W. The 40s are lined up, and a total of 10 Pca support members 40 are installed on both sides in the width direction W.

Further, in the protective skeleton 10 in which each element is configured in this way, the cylindrical oil tank 1 is installed on the Pca assembled bottom floor slab 20 formed by connecting the Pca floor slab members 21 via the support member 50. Pca strut members 40 are installed on both sides of the cylindrical oil tank 1 in the width direction W, and the Pca assembling upper deck member 30 formed by connecting the Pca floor slab member 31 is connected to the Pca strut member 40 at the upper part of the cylindrical oil tank 1. It is constructed by joining with the upper end of.
At this time, the Pca support member 40 arranged on the side of the cylindrical oil tank 1 is installed so that the flat side surface 45 faces the outside in the width direction W.

Subsequently, a method of constructing the protective skeleton 10 having the above-described configuration and burying the cylindrical oil tank 1 will be described with reference to FIGS. 6 to 13.
First , as shown in FIG. 7A, the place where the cylindrical oil tank 1 is to be buried is excavated to a predetermined depth, and the place where the crushed stone 110 and the foundation concrete 100 (hereinafter referred to as the foundation concrete 100) are laid is dug down and floored. (Step s1 (excavation / flooring process)), crushed stone 110 is laid at the relevant location, and foundation concrete 100 is placed on the laid crushed stone 110 with a predetermined thickness (step s2 (crushed stone / foundation concrete laying process). ): See FIG. 7 (b)).
At this time, the upper surface of the foundation controller 100 is formed horizontally so that the Pca floor slab members 21 can be laid out side by side.

Subsequently, the Pca floor slab member 21 is laid out on the upper surface of the foundation controller 100 along the length direction L while being connected by the connecting member 25 and the connecting plate 27 to form the Pca assembled bottom floor slab 20 (step s3 (step s3). Bottom floor slab installation / connection process): See FIG. 8), two support members 50 supporting the cylindrical oil tank 1 are installed on the upper surface of the configured Pca assembled bottom deck 20 at predetermined intervals in the length direction L. -While fixing (see FIG. 9A), the cylindrical oil tank 1 is installed so as to straddle the two installed support members 50 (step s4 (oil tank installation step): see FIG. 9B). Here, the cylindrical oil tank 1 is fixed to the support member 50 fixed to the upper surface of the Pca assembly bottom floor slab 20 with a fixing band (not shown).

Then, as shown in FIG. 10A, the Pca strut member 40 is arranged on the side of the cylindrical oil tank 1 installed on the Pca assembly bottom deck 20 in the width direction W, and the Pca assembly bottom deck 20 and the Pca assembly bottom deck 20 are arranged. Join (step s5 (Pca support building step)).

Further, the lower joining member 22 and the posture adjusting portion 44 adjust the installation posture of the Pca strut member 40 with respect to the Pca assembled bottom floor slab 20, and the adjusting space S, the insertion hole 441 and the fixing hole are adjusted through the insertion hole 441 and the fixing hole 442. 442 is filled with the filler F (step s6 (Pca support posture adjustment / filling step)).

Specifically, as shown in FIG. 4 (e), in order to join the Pca support member 40 to the Pca assembly bottom floor slab 20, the installation adjustment metal fitting 23 is provided so that the Pca support member 40 has a predetermined height. By adjusting, the height of the Pca strut member 40 can be adjusted by bringing the tip of the building adjustment metal fitting 23 into contact with the bottom surface of the Pca strut member 40.

Further, the four adjusting screw reinforcing bars 24 planted in the Pca assembly bottom floor slab 20 are inserted into the insertion holes 441 provided on the bottom surface of the Pca support column member 40, and the fixing screw 442 is used to insert the nuts into the adjusting screw reinforcing bars 24 (not shown). Omitted) is screwed in and fixed.

At this time, the inclination of the Pca support member 40 in the length direction L is adjusted by adjusting the screwing amount of the nut with respect to the two adjusting screw reinforcing bars 24b arranged at predetermined intervals in the length direction L at the fixing hole 442b. can do. Similarly, the inclination of the Pca support member 40 in the width direction W is adjusted by adjusting the screwing amount of the nut with respect to the two adjusting screw reinforcing bars 24a arranged at predetermined intervals in the width direction W at the fixing hole 442a. Can be done.
The inclination of the width direction W should be adjusted more accurately by adjusting the plurality of Pca support members 40 arranged in the length direction L so that the flat side surface 45 facing the outside of the width direction W passes through. Can be done.

In this way, after adjusting the installation posture of the Pca strut member 40 with respect to the Pca assembly bottom floor slab 20, as shown in FIG. 11B, the posture adjusting portion 44 and the adjustment composed of the insertion hole 441 and the fixing hole 442. The space S is filled with the filler F to fix the adjusted state.

Then, as shown in FIG. 10B, the circumference of the cylindrical oil tank 1 is backfilled and compacted to a predetermined height (step s7 (primary backfilling / compacting step)). Specifically, the lubrication port 2, the ventilation port 3, the leak detection unit 4, and the like provided on the upper part of the cylindrical oil tank 1 are backfilled to a height at which piping or a protector can be attached.

After the completion of the primary backfilling as described above, piping or a protector is attached to the cylindrical oil tank 1, the lubrication port 2, the ventilation port 3, and the leak detection unit 4 (step s8 (pipe / protector attaching step). ), Secondary backfilling and rolling are performed as shown in FIG. 12A (step s9 (secondary backfilling / rolling)). In the secondary backfilling / rolling step, backfilling and rolling is performed up to the height of the bottom surface of the Pca assembly upper deck 30, that is, near the upper end position of the Pca support column member 40.

In this state, the Pca floor slab member 31 is laid out on the surface of the secondary backfill while being connected by the connecting member 34 for connecting along the length direction L to form the Pca assembled upper floor slab 30. The upper joining member 32 is filled with the filler F (step s10 (upper deck installation / connection / filling step): see FIGS. 12 (a) and 12 (b)). As the filler F, an appropriate filler such as non-shrink mortar can be used.

Specifically, the Pca floor slab member 31 is laid on the surface of the secondary backfill along the length direction L, and the joint screw reinforcing bar 43 provided at the upper end of the Pca support member 40 exposed on the backfill surface is top-joined. Pca is inserted into the member 32 and a nut is screwed to join the Pca strut member 40 and the Pca deck member 31, and Pca is repeated while connecting the adjacent Pca deck members 31 in the length direction L. Assembles the upper floor slab 30. Then, the filler F is filled in the upper joining member 32 in the Pca assembled upper deck 30 formed by connecting the Pca floor slab members 31 (see FIG. 11A).

In a state where the Pca assembly upper deck 30 is configured in this way and the protective skeleton 10 is assembled, the ground is leveled around the Pca assembly upper deck 30 as shown in FIG. 13 (step s11 (ground leveling step). )), Construction of the protective skeleton 10 for burying the cylindrical oil tank 1 in the ground is completed.

As described above, the precast concrete Pca assembly bottom deck 20 on which the cylindrical oil tank 1 is placed as the protective skeleton 10 for protecting the laterally oriented cylindrical oil tank 1 buried in the ground, and the cylindrical oil tank 1 A precast concrete Pca assembled upper deck 30 arranged at the top, and a plurality of precast concrete arranged on the side of the cylindrical oil tank 1 on the Pca assembled bottom deck 20 and supporting the Pca assembled upper deck 30. It is composed of Pca strut members 40 made of concrete, and Pca assembled deck members 20 and 30 are connected by connecting a plurality of Pca deck members 21 and 31 arranged along the length direction L of the cylindrical oil tank 1. Since each Pca deck member 31 constituting the Pca assembled upper deck 30 is supported by Pca support members 40 arranged on both sides in the width direction W, the cylindrical oil tank 1 to be buried in the ground 1 It is possible to construct a protective skeleton 10 capable of reliably protecting the concrete.

Further, the protective skeleton 10 having such a configuration includes a Pca assembly bottom deck installation / connection step (step s3) for installing a Pca assembly bottom deck 20 made of precast concrete, and a Pca assembly top on the Pca assembly bottom deck 20. Oil tank installation step (step s4) for installing a plurality of precast concrete Pca strut members 40 and a cylindrical oil tank 1 for supporting the deck 30, Pca strut construction (step s5), and Pca strut posture adjustment / filling. Step (step s6), primary backfilling / rolling step (step s7) and secondary backfilling / rolling (step s9), in which the circumference of the cylindrical oil tank 1 is backfilled to the lower surface position of the Pca assembly upper deck 30. Further, in the upper part of the cylindrical oil tank 1, a plurality of Pca floor slab members 31 are arranged to connect the Pca floor slab members 31 to each other, and the Pca assembly upper floor slab 30 is joined to the upper end portion of the Pca support column member 40. Since the constituent upper deck installation / connection / filling step (step s10) is performed in this order for construction, the area directly under the Pca assembled upper deck 30 can be reliably backfilled. Therefore, it is possible to prevent the protective skeleton 10 from deteriorating the protection function due to poor backfilling directly under the Pca assembly upper deck 30, and to reliably protect the cylindrical oil tank 1.

Further, after the circumference of the cylindrical oil tank 1 is backfilled to the lower surface position of the Pca assembly upper deck 30, a plurality of Pca deck members 31 are arranged on the upper part of the cylindrical oil tank 1 to form the Pca deck members 31 with each other. And joined to the upper end of the Pca strut member 40 to form the Pca assembly upper deck 30. Therefore, the connection work for connecting the Pca deck members 31 to each other and the Pca deck member 31 (Pca assembly upper deck 31) The joining work of joining 30) and the upper end of the Pca support member 40 is no longer a high-place work, and the Pca assembled upper deck 30 can be constructed safely and stably.

Furthermore, after the circumference of the cylindrical oil tank 1 is backfilled to the lower surface position of the Pca assembly upper deck 30, a plurality of Pca deck members 31 are arranged on the upper part of the cylindrical oil tank 1 to arrange the Pca deck member 31. The Pca floor slab member 31 is connected to each other and joined to the upper end of the Pca support member 40 to form the Pca assembly upper deck member 30, that is, because the cylindrical oil tank 1 is protected by a backfill material. The Pca assembly upper part can be safely installed without damaging the cylindrical oil tank 1 by the connection work for connecting the two to each other and the joining work for joining the Pca floor slab member 31 (Pca assembly upper deck 30) and the upper end portion of the Pca support column member 40. The deck 30 can be constructed.

Further, since one Pca strut member 40 is arranged on each side of each Pca floor slab member 31 constituting the Pca assembly upper floor slab 30 on both sides in the width direction W, each of the four corners of the Pca floor slab member 31 is arranged. Compared with the case where the Pca support member 40 is arranged, a space can be secured between the Pca support member 40 arranged on the side of the cylindrical oil tank 1 and the cylindrical oil tank 1. Therefore, the lower part of the cylindrical oil tank 1 can be reliably backfilled. Therefore, it is possible to prevent damage to the cylindrical oil tank 1 due to poor backfilling below the cylindrical oil tank 1 and to reliably protect the cylindrical oil tank 1.

Compared to the case where the Pca deck member 31 is joined to the Pca strut members 40 arranged at the four corners, one is provided on each side of each Pca deck member 31 constituting the Pca assembled upper deck 30 in the width direction W. When joining to the Pca strut members 40 arranged one by one, the circumference of the cylindrical oil tank 1 is backfilled to the lower surface position of the Pca assembly upper deck 30 although it tends to be unstable in the length direction L with respect to the Pca strut member 40. After that, a plurality of Pca floor slab members 31 are arranged on the upper part of the cylindrical oil tank 1 and joined to the Pca support column members 40, and the Pca floor slab members 31 are connected to each other, that is, a plurality of Pca floors are placed on the backfill surface. Since the plate member 31 can be arranged and joined to the Pca strut member 40 and the Pca floor slab members 31 can be connected to each other, the construction can be carried out safely in a stable state.

Further, the Pca assembled bottom floor slab 20 is configured by arranging a plurality of Pca floor slab members 21 and connecting the Pca floor slab members 21, and in the height direction H, the corresponding Pca floor slab member 21 is in the length direction. The Pca deck member 31 is formed so as to have the same length as the length of L, that is, the Pca deck member 31 and the Pca deck member 21 corresponding to the height direction H are formed in the same size. Therefore, the connection positions of the Pca deck members 21 and 31 in the Pca assembled decks 20 and 30 are equal to each other, and the Pca in the length direction L of each of the Pca deck members 21 and 31 constituting the Pca assembled decks 20 and 30 becomes equal. The positions of the strut members 40 can be aligned. Therefore, it is possible to construct the protective skeleton 10 which is stable in strength.

Further, in the Pca support posture adjustment / filling step (step s6), the Pca support member 40 is adjusted by the lower joining member 22 and the posture adjustment unit 44 in order to adjust the installation posture of the Pca support member 40 with respect to the Pca assembly bottom floor slab 20. It can be installed with high accuracy on the assembly bottom floor slab 20.

Further, the lower octagonal portion 41 of the Pca strut member 40 has a polygonal cross section equal to or larger than the upper substantially circular portion 42 which is a circular cross section having the required strength, and in the Pca strut posture adjustment / filling step (step s6), It has the necessary strength because the lower joint member 22 and the posture adjusting unit 44 adjust the installation posture of the Pca support member 40 with respect to the Pca assembly bottom floor slab 20 on the flat side surface 45 of the Pca support member 40 having a polygonal cross section. The Pca strut member 40 can be installed more accurately.

More specifically, a plurality of Pca strut members 40 having at least a lower portion having a polygonal cross section equal to or higher than a circular cross section having the required strength, and a flat side surface 45 extending in the height direction H outside the width direction W. Since it is installed facing, the installation posture is adjusted so that the flat side surfaces 45 of the plurality of Pca support members 40 form a virtual plane when viewed from the length direction L, so that the plurality of Pca support members 40 are installed. Can be installed more accurately.

Further, since the reinforcing bars 26 and 33 of the region X surrounded by the broken lines in FIGS. 5 (c) and 5 (e) are beam-structured reinforcing bars inside the member edge of the Pca assembly upper deck 30, the Pca support members 40 are connected to each other. Since the member edges of the Pca assembled decks 20 and 30 straddling the above can form a beam structure, the frame type structure is formed by the member edges of the Pca assembled decks 20 and 30 and the Pca strut member 40 on the side surface of the protective skeleton 10. It is possible to construct a protective skeleton 10 having a strong frame structure.

In the correspondence between the configuration of the present invention and the above-described embodiment, the bottom deck installation step of the present invention corresponds to the bottom deck installation / connection step (step s3).
The strut / tank installation process corresponds to the oil tank installation process (step s4), the Pca strut building process (step s5), and the Pca strut posture adjustment / filling process (step s6).
The backfilling process corresponds to the secondary backfilling and rolling compaction (step s9).
The upper deck installation process corresponds to the upper deck installation / connection / filling process (step s10).
The tubular tank corresponds to the cylindrical oil tank 1 and
The protective skeleton corresponds to the protective skeleton 10.
The bottom deck corresponds to the precast assembled bottom deck 20
The upper floor slab corresponds to the precast assembled upper floor slab 30.
The strut corresponds to the precast strut member 40,
The length direction corresponds to the length direction L,
The floor slab member corresponds to Pca floor slab members 21 and 31.
The width direction corresponds to the width direction W,
The adjusting means corresponds to the lower joining member 22 and the posture adjusting portion 44, and corresponds to the lower joining member 22 and the posture adjusting portion 44.
Reinforcing bars correspond to reinforcing bars 26 and 33,
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the above description, the laterally oriented cylindrical oil tank 1 has a circular cross section, but it may have a cylindrical shape having an appropriate cross-sectional shape such as a polygonal cross section such as an octagonal cross section.
Further, the lower octagonal portion 41, which is the lower part of the Pca support member 40 described above, may be formed by a polygonal cross section such as a quadrangle, a hexagon, or a decagon.

The lower part of the Pca strut member 40 is composed of the lower octagonal portion 41 and the upper portion is composed of the upper substantially circular portion 42, but the entire Pca strut member 40 is uniform with either the lower octagonal portion 41 or the upper substantially circular portion 42. It may be formed in the cross-sectional shape of. Further, in the above description, the lower octagonal portion 41 and the upper substantially circular portion 42 of the Pca strut member 40 are configured to have a uniform cross-sectional size in the height direction H, but if the required strength as the Pca strut member 40 can be secured, It may be configured in a tapered shape that tapers upward in the height direction H.

Further, a surface layer may be provided so as to fill the upper surface of the Pca assembly upper deck 30.
Further, in the above description, the oil tank installation step (step s4), the Pca strut building step (step s5), and the Pca strut posture adjustment / filling step (step s6) are described in this order. Depending on the size of the cylindrical oil tank 1 and the conditions such as the construction environment, the Pca support member 40 is arranged on the Pca assembly bottom floor slab 20 and joined to the Pca assembly bottom floor slab 20 (Pca support building process). After adjusting the installation posture of the strut member 40 and filling the adjustment space S, the insertion hole 441, and the fixing hole 442 with the filler F through the insertion hole 441 and the fixing hole 442 (Pca strut posture adjustment / filling step), the cylinder. The oil tank 1 may be installed (oil tank installation process).

Further, only the Pca strut member 40 on one side in the width direction W is arranged on the Pca assembly bottom deck 20 and joined to the Pca assembly bottom deck 20 (Pca strut building step), and the installation posture of the Pca strut member 40. The adjustment space S, the insertion hole 441, and the fixing hole 442 are filled with the filler F through the insertion hole 441 and the fixing hole 442 (Pca support posture adjustment / filling step), and then the cylindrical oil tank 1 is installed (. Oil tank installation process), and finally, the Pca support member 40 on the opposite side in the width direction W is placed on the Pca assembly bottom deck 20 and joined to the Pca assembly bottom deck 20 (Pca support building process). The installation posture of the Pca strut member 40 may be adjusted, and the adjustment space S, the insertion hole 441, and the fixing hole 442 may be filled with the filler F through the insertion hole 441 and the fixing hole 442 (Pca strut posture adjustment / filling step). ..

In the above description, of the four adjusting screw reinforcing bars 24, two adjusting screw reinforcing bars 24a planted at a predetermined interval in the width direction W with respect to the built-in adjusting metal fitting 23 are arranged at a predetermined interval in the length direction L. The fixing holes 442a are formed shorter than the two adjusting screw reinforcing bars 24b planted at a distance from each other, and the fixing holes 442a are screwed into the two adjusting screw reinforcing bars 24b planted at a predetermined interval in the length direction L. Two adjusting screw reinforcing bars 24a, which are provided at a position lower than the hole 442b but are planted at a predetermined interval in the width direction W, are planted at a predetermined interval in the length direction L. It may be formed longer than 24b, and the fixing hole 442a may be provided at a position higher than the fixing hole 442b screwed into the two adjusting screw reinforcing bars 24b planted at predetermined intervals in the length direction L. Further, the four adjusting screw reinforcing bars 24 may be formed to have the same length, and the four fixing holes 442 may be provided at the same height position.

Further, the above-mentioned Pca assembly bottom floor slab 20 is configured by connecting a plurality of Pca floor slab members 21 with a connecting member 25, but as shown in FIGS. 14 to 16, the plurality of Pca floor slab members 21 are integrated. The Pca assembly bottom floor slab 20 may be configured.

More specifically, as shown in FIG. 14, a plurality of Pca floor slab members 21 constituting the Pca assembly bottom floor slab 20 may be integrated by the integrated metal fitting 27. The integrated metal fitting 27 includes a metal plate material 271 having a rectangular shape in a plan view that is long in the width direction W and straddles the bottom surface side connection between the Pca floor slab members 21, and a plurality of mounting bolts planted in the plate material 271. It is composed of 272.

The plate material 271 is a plate body having a cross section in the width direction W equal to or more than the amount of reinforcing bars in the cross section along the width direction W constituting the Pca deck member 21, and a plurality of plate members 271 are spaced apart from each other in the width direction W. The mounting bolts 272 are planted so as to project upward, and a plurality of mounting bolts 272 planted at predetermined intervals in the width direction W straddle the center of the length direction L in the length direction L. Two rows are provided so as to be separated by a predetermined interval. One of the two rows of mounting bolts 272 arranged at predetermined intervals in the length direction L is fixed to one of the Pca deck members 21 arranged side by side in the length direction L, and the two rows of mounting bolts are fixed. The other side of 272 is fixed to the other side of the Pca deck member 21 arranged side by side in the length direction L.

The Pca floor slab member 21 integrated by the integrated metal fitting 27 configured in this way is provided with an fitting recess 27a on the bottom surface side into which the plate material 271 is fitted at the end portion in the length direction L, and is attached. A through hole 27b through which the bolt 272 is inserted in the height direction is provided corresponding to the mounting bolt 272.

Then, in constructing the Pca assembly bottom floor slab 20, when the Pca floor slab members 21 are arranged side by side along the length direction L, one mounting bolt 272 of the length direction L in the integrated metal fitting 27 is placed on one side. The Pca floor slab member 21 is inserted into the through hole 27b, the other mounting bolt 272 is inserted into the other through hole 27b, and the plate material 271 is fitted into the recess 27a for installation. Then, the nut shown from the upper surface side of the through hole 27b is screwed into the mounting bolt 272, and the integrated metal fitting 27 is fixed to the Pca floor slab member 21, so that the Pca floor slab members 21 arranged in the length direction L are aligned with each other. Can be integrated. By applying this to a predetermined number of Pca floor slab members 21, the Pca assembly bottom floor slab 20 integrated by the integrated metal fittings 27 can be configured.

In FIG. 14, the integrated metal fitting 27 is formed over the entire width of the Pca deck member 21, but the width of the plate member 271 is equal to or larger than the amount of reinforcing bars in the cross section along the width direction W constituting the Pca deck member 21. As long as it has a cross section in the direction W, it may be provided only in a part of the width direction W in the Pca deck member 21, or a plurality of integrated metal fittings 27 may be provided in the width direction W at predetermined intervals. good.

Further, as another method for integrating the Pca floor slab members 21 constituting the Pca assembly bottom floor slab 20, as shown in FIG. 15, the length direction of the reinforcing bars 26 constituting the Pca floor slab member 21 One of the main reinforcing bars 261 of L is projected from the end face of the Pca deck member 21, and a mechanical joint 28 is provided at the other end.

Then, in constructing the Pca assembly bottom floor slab 20, when the Pca floor slab members 21 are arranged side by side along the length direction L, the main reinforcing bars 261 protruding from the end surface of the Pca floor slab member 21 are arranged in the length direction. It is connected to a mechanical joint 28 provided on the other end surface of the Pca deck member 21 adjacent to L. As a result, the main reinforcing bars 261 of the Pca floor slab members 21 arranged in the length direction L are continuous, and the Pca floor slab members 21 can be integrated with each other. By applying this to a predetermined number of Pca floor slab members 21, the Pca assembly bottom floor slab 20 integrated by the integrated metal fittings 27 can be configured.

Furthermore, as another method for integrating the Pca floor slab members 21 constituting the Pca assembly bottom floor slab 20, a plurality of Pca floor slab members 21 arranged side by side in the length direction L, as shown in FIG. A through hole penetrating in the length direction L is provided in the through hole, and the PC steel rod 29 is inserted into the through hole and becomes tense, so that a plurality of Pca deck members 21 arranged in the length direction L are prestressed. As a result, a plurality of Pca deck members 21 arranged in the length direction L can be integrated with each other. By applying this to a predetermined number of Pca floor slab members 21, the Pca assembly bottom floor slab 20 integrated by the integrated metal fittings 27 can be configured.

In this way, by providing the integrated metal fitting 27, the mechanical joint 28, or the PC steel rod 29, the Pca assembled bottom deck 20 is configured as a solid and unified foundation similar to the in-situ cast bottom deck. be able to. Although the precast assembly upper floor slab 30 is configured by connecting a plurality of precast floor slab members 31, the bottom floor plate may be configured by casting in the field.

1 ... Cylindrical oil tank 10 ... Protective skeleton 20 ... Precast assembly bottom Deck 21 ... Precast deck member 22 ... Lower joint member 23 ... Reinforcing bar 27 ... Integrated metal fittings 28 ... Mechanical joint 29 ... PC steel rod 30 ... Precast assembly top Deck 31 ... Precast Deck member 33 ... Reinforcing bar 40 ... Precast strut member 44 ... Attitude adjustment unit L ... Length direction W ... Width direction

Claims (10)

It is a method of constructing a protective skeleton that protects a horizontal tubular tank buried in the ground.
Bottom slab installation process to install precast concrete bottom slab,
Strut tank installing step of installing a plurality of pre-cast concrete supports for upper portions slab on the bottom deck and with said cylindrical tank,
A backfilling step in which the circumference of the tubular tank is backfilled to the lower surface position of the upper deck.
Further, in the upper part of the tubular tank, a plurality of deck members are arranged, the floor slab members are connected to each other, and the upper floor slab is installed by joining to the upper part of the support column to form the upper deck. this order in the stomach line,
The support is
A method for constructing a protective skeleton in which one internal reinforcement at a member edge is arranged on each side of each floor slab member constituting the upper deck, which is a beam structure reinforcement, in the width direction. .. The bottom floor slab is constructed by arranging a plurality of floor slab members and connecting the floor slab members to each other.
The method for constructing a protective skeleton according to claim 1, wherein the bottom floor slab and the floor slab members in the upper floor slab have the same connection position. The method for constructing a protective skeleton according to claim 2 , wherein a plurality of floor slab members constituting the bottom floor slab are integrated by an integrating means. The method for constructing a protective skeleton according to any one of claims 1 to 3 , wherein in the support column / tank installation step, the installation posture of the support column with respect to the bottom floor slab is adjusted by an adjusting means. At least the bottom of the column
Consists of a polygonal cross section equal to or greater than a circular cross section with the required strength.
The method for constructing a protective skeleton according to claim 4 , wherein in the support column / tank installation step, the installation posture of the support column with respect to the bottom floor slab is adjusted by the adjusting means according to the side surface of the support column having a polygonal cross section. .. A protective skeleton that protects a horizontal tubular tank buried underground.
A precast concrete bottom deck on which the tubular tank is placed, and
A precast concrete upper deck to be placed on top of the tubular tank,
It is composed of a plurality of precast concrete columns arranged on the bottom deck on the side of the tubular tank and supporting the upper deck.
The bottom floor slab and the top floor slab
It is configured by connecting a plurality of floor slab members arranged along the length direction of the tubular tank.
Each floor slab member constituting the upper deck is joined to the upper part of the support column arranged on each side in the width direction, and is supported by the support column.
The internal reinforcement at the member edge of the upper deck is a beam structure reinforcement. <br /> A protective skeleton. The bottom floor slab is configured by arranging a plurality of floor slab members and connecting the floor slab members to each other.
The protective skeleton according to claim 6 , wherein in the bottom floor slab and the upper floor slab, the connecting positions for connecting the floor slab members are the same. The protective skeleton according to claim 7 , further comprising an integrated means for integrating a plurality of floor slab members constituting the bottom floor slab . The protective skeleton according to any one of claims 6 to 8, which is provided with an adjusting means for adjusting the installation posture of the support column with respect to the bottom floor slab. The support is
The protective skeleton according to any one of claims 6 to 9, wherein at least the lower portion is formed by a polygonal cross section having a required strength equal to or higher than a circular cross section.

Images