JP4092700B2 - Tank installation method and tank foundation structure implementing the method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a tank installation method for installing a tank for storing gasoline, petroleum, and other oil liquids in the ground, and a tank foundation structure that implements the method.

  Generally, in a gasoline filling station, a plurality of underground tanks formed as cylindrical sealed containers are embedded, and oil liquids such as gasoline, light oil, and kerosene are individually stored in these underground tanks.

Conventional tank burial involves excavating the ground to a predetermined depth, assembling the formwork and placing the concrete, placing the concrete to form the base, placing the tank on it, and placing the concrete struts. Many things were used, and it took days for concrete curing.
In burying the underground tank, the present applicant has proposed an improved tank burying method for the purpose of shortening the construction period and facilitating the burying (Patent Document 1).

  However, in recent years, the capacity of underground tanks has increased due to the increase in size of gas stations. Therefore, in the above method, it is not always easy to cope with the tank capacity when burying underground tanks, it becomes difficult to transport the tank unit, and several days are required for placement and curing of the base frame and columns. However, there was still room for improvement.

In addition, a tank pillow frame is attached to the base frame on the ground, and the tank is fixed to the tank pillow frame with a band and installed on the ground in the hole where the tank unit is embedded, and concrete is poured into the base frame and pillow frame before solidification. It is also known that the hole is filled back to make the concrete curing period unnecessary (Patent Document 2).
However, this known technique is not sufficient for the tank capacity and is not versatile.
Japanese Patent Laid-Open No. 61-196077 Japanese Examined Patent Publication No. 4-52345

  SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems, and is a versatile and easily adaptable to various tank capacities, and a tank installation method capable of shortening the construction period and a tank in which the method is implemented. It is to provide a foundation structure for use.

According to the tank installation method of the present invention, in the tank installation method in which the tank for storing the oil liquid is embedded in the hole excavated in the ground, the tank has the base member 11 and the two support members 12 so as to exhibit a U-shape. A base frame 10 made of reinforced concrete is prepared, a hole for burying the tank T is dug in the ground, and at least one pair of the base frames 10 is arranged in parallel in the hole, and the base rebar is placed between the opposing base members 11. 30 is placed, and the reinforced concrete pillow frame 20 that is pressed is placed on the base rebar 30.
Concrete is placed on the base rebar 30 to form a base board, the tank T is placed and fixed on the pillow frame 20, the holes are backfilled, and a concrete pavement is formed on the ground surface.

  Further, according to the tank foundation structure of the present invention, in the tank foundation structure for installing the tank in the ground, the base member 11 and the two support members 12 are provided on the bottom surface of the excavated hole. At least one pair of reinforced concrete base frames 10 processed so as to have a shape are formed, a reinforced concrete base board is formed between the base members 11, and the base reinforcing bars 30 are arranged between the base members 11 facing each other. A reinforced concrete pillow frame 20 is placed and fixed on the base rebar 30, and the tank T is supported on the pillow frame 20.

It is preferable that the base frame can be connected in the vertical direction so that it can cope with a change in the length of the tank.
The base frame and the base rebar are preferably flexible in the lateral direction so as to be able to cope with changes in the width of the tank.
When installing a plurality of tanks, the base frame may be shared with adjacent tanks.
If sand bags are used when tanks are buried, recycling is easy.

(A) According to the present invention, since the base frame is processed in advance in the factory, curing at the construction site is not required, and the work period of tank installation can be shortened.
(B) The base frame can be continuously provided in the vertical direction (longitudinal direction), and can easily cope with a change in the length of the tank.
(C) The base frame and the base rebar are flexible in the lateral direction and can easily cope with changes in the width of the tank.
(D) When multiple tanks are installed adjacent to each other, the base frame can be shared.
(E) Since the tank load is not applied to the base board after the concrete is placed, the hole can be backfilled without waiting for the base board to be cured, and the construction period can be shortened.

  An embodiment of the present invention will be described with reference to FIG. In the present invention, a base frame 10 and a pillow frame 20 are prepared. These base frame 10 and pillow frame 20 are made of reinforced concrete, and are previously processed integrally in a factory, and do not require curing at the construction site.

  The base frame 10 includes a base member 11 and a pair of support members 12 that are vertically provided from both ends thereof, and has an outward appearance of a U shape. A plurality of projecting members 13 are provided on at least one side surface of the base member 11, and the members 13 are preferably formed of reinforcing bars, and a plurality of extended reinforcing bars having a predetermined length are provided on the upper end portion of the column member 12. 14 is provided. In addition, when the tank of FIG. 6 described later is installed adjacent in the lateral direction, the protruding members 13 are provided on both sides of the base member 11.

  On the other hand, although not shown, a hole is excavated in the ground in order to embed a tank T for storing gasoline or the like. When excavating, preferably, a large number of sheet piles are driven in an encircling manner in the planned site of the hole, and the ground surrounded by the sheet pile is excavated to a predetermined depth to form a hole.

  A pair of base frames 10 are arranged opposite to each other in the excavated hole ((A) in FIG. 1). In this case, the base member 11 is placed on the bottom surface of the hole with an interval corresponding to the width of the tank, the pair of base members 11 are in parallel with each other, and the column members 12 are in an upright state. .

Next, the base reinforcing bars 30 are disposed between the base members 11 facing each other, and both side portions thereof are locked to the protruding members 13 on the side surfaces of the base member 11 ((B) in FIG. 1).
A pillow frame 20 made of pre-processed reinforced concrete is placed on the base rebar 30. A plurality of locking reinforcing bars (not shown) having a predetermined length are provided at the lower part of the pillow frame 20, and the locking reinforcing bars are locked to the base reinforcing bar 30 ((c) in FIG. 1).

Next, the tank T is placed on the pillow frame 20 and fixed to the pillow frame 20 or the base frame 10 by a fixing member such as a band (not shown) ((D) and (E) in FIG. 1).
It should be noted that concrete can be placed on the base rebar 30 in any of the states (c), (d), and (e) in FIG.

Note that concrete is placed on the base rebar 30 to form a base board, piping (not shown) to the ground is attached to the tank T, and earth and sand are backfilled. As backfill soil, for example, backfill soil containing bags of sand, mountain sand or crushed stone is used, but by using backfill soil in bags, digging and recycling can be simplified. it can.
After backfilling, the pavement rebar 35 stored in the pavement frame 34 is placed on the column member 12 ((e) in FIG. 1), and the pavement frame 34 is placed on the extended rebar 14 at the upper end of the column member 12. The pavement reinforcing bar 35 may be appropriately locked and concrete may be placed to form the pavement.

  Although not shown in the drawings, the pillow frame 20 is fixed to the base rebar using the locking rebar as described in the conventional example, but the pillow frame 20 or the base frame 10 has a bolt on either side. A locking bracket having a hole is provided, a bolt insertion hole is provided on the other side, the bolt is inserted into the bolt insertion hole, and is screwed into the bolt hole, thereby fixing the pillow frame 20 to the base frame 10. Good.

  The example of the process for implementing the basic tank installation method has been described above. Next, an example of the installation method when the tank size and arrangement are different will be described with reference to FIGS.

  In FIG. 2, in order to continuously connect the U-shaped base frame 10 in the vertical direction, each post member 12 is provided with an insert 15 having a bolt hole, and this insert 15 is used as a bolt receiver.

  FIG. 3 shows an example in which a relatively small tank is installed. A pair of U-shaped base frames 10 are arranged opposite to each other, and a tank T is installed therebetween.

  FIG. 4 shows an example in which a relatively large tank is installed. Four base frames 10 arranged in series in the vertical direction are opposed to each other, and a relatively large tank T is disposed as a single tank between them. The In this case, the base frame 10 is continuously provided in the vertical direction by inserting bolts into the bolt insertion holes of the joint plate (not shown) and screwing into the bolt holes of the inserts (FIG. 2) of the base frames 10. be able to.

  FIG. 5 shows an example in which relatively large tanks are arranged in a horizontal direction. The four U-shaped base frames 10 are arranged in a row in the vertical direction, and are further arranged in four rows in the horizontal direction, and tanks T are arranged therebetween, forming a so-called three-tank tank. The oil liquid is stored. In this example of installation, the pillow frames 20 of the tanks T on both sides of the tanks T on both sides of the tanks T are supported between the adjacent tanks T, thereby supporting the tanks T on the rows T on both sides. Can be shared.

The figure explaining one Embodiment of the installation method of the tank by this invention. The figure which shows one example of the base frame in this invention. The figure which shows the example which installs a small tank in this invention. The figure which shows the example which installs a large sized tank in this invention. The figure which shows the example which arranges a large sized tank in the horizontal direction in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Base frame 11 ... Base member 12 ... Support | pillar member 13 ... Protruding member 14 ... Extension rebar 20 ... Pillow frame 30 ... Base rebar 35 ... Paving rebar T ···tank

Claims (2)

In the tank installation method of burying a tank for storing oil in a hole excavated in the ground, a base frame made of reinforced concrete having a base member and two support members and processed to have a U-shape is prepared, Reinforced concrete made by digging a hole to embed a tank in the ground, placing at least one pair of base frames in parallel in the hole, placing a base rebar between opposing base members, and pressing the base rebar It is characterized by placing a pillow frame, placing concrete on the base rebar to form a base board, placing and fixing a tank on the pillow frame, backfilling the holes, and forming a concrete pavement on the ground surface How to install the tank to be used. In a tank foundation structure for installing a tank in the ground, at least a base frame made of reinforced concrete having a base member and two support members on the bottom of the excavated hole and processed to have a U-shape is provided. A pair of reinforced concrete base plates are formed between the base members, base rebars are disposed between the base members facing each other, and a reinforced concrete pillow frame pressed on the base rebars is provided. A tank base structure characterized in that the tank is placed and fixed and supported on the pillow frame.

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