JPH06299730A - Method of constructing roof for underground tank - Google Patents

Abstract

PURPOSE:To reduce construction cost at a time when a roof for an underground tank is constructed while shortening the overall term of work required for building the underground tank. CONSTITUTION:A plurality of roof blocks 7, 8, 9 constituting the half of a roof are erected and these roof blocks are slid and placed successively on the opening edge 2a of a body 1 along rails 11a, 11b, 11c in a working yard 6 on the side of the body 1, thus manufacturing a roof structure. The roof structure is rotated horizontally at 180 deg., a plurality of other roof blocks 7, 8, 9 similarly constructed on the working yard 6 are slid successively in the same manner along the rails 11a, 11b, 11c, and these roof blocks 7, 8, 9 are put on the residual opening edge 2a. The sidewall 2 of the body 1 and each roof block 7, 8, 9 at every two are connected by ring beams consisting of placed concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a roof of an underground tank in which a low temperature liquefied gas or the like is stored.
The present invention relates to a method for constructing a roof for an underground tank, which comprises constructing a bottomed tubular structure consisting of a side wall and a bottom slab in the ground, and then constructing a disk-shaped concrete roof on the opening edge of the side wall.

[0002]

2. Description of the Related Art Conventionally, in the case of constructing a tank of this type underground, first, in a drill hole formed by excavating the ground,
A skeleton consisting of a concrete bottom slab and a concrete cylindrical side wall standing upright from the peripheral portion of the bottom slab is constructed.

After the skeleton is completed, a large number of temporary materials such as pipes and support materials are carried into the skeleton, and the temporary materials are assembled to construct a supporting structure (temporary structure) inside the skeleton. This shoring has a height at which the horizontal level is substantially the same as the upper end of the side wall, and the roof member is supported by this shoring, and the roof is constructed by covering the upper opening of the side wall.

[0004]

By the way, in the method of constructing the roof as described above, a huge amount of temporary materials are required for constructing the support work, and at the time of assembling or dismantling them. The current situation is that it takes a lot of human labor and a lot of time to do so, and there was a problem in terms of support construction costs.

Further, the roof cannot be constructed until the construction of the supporting work is completed, the construction period of the roof construction is prolonged, and furthermore, once the supporting work is constructed inside the skeleton, Other required construction (for example, finishing construction such as rustproofing work on the side wall inner surface of the skeleton or bottom plate) cannot be performed in parallel with the construction of the roof. Therefore, the conventional roof building method has a problem that the construction period required to build the entire tank is long.

The present invention has been made in view of the above circumstances, and it is possible to reduce the cost required for a temporary structure when constructing the roof of an underground tank and to shorten the construction period of the entire tank. The purpose is to provide a method for constructing a roof for an underground tank.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the first aspect of the present invention is to construct a bottomed cylindrical skeleton including a side wall and a bottom slab in the ground, and then to form the side wall. In the opening edge, is a roof construction method of an underground tank for constructing a disk-shaped concrete roof, from a working yard on the ground on the side of the opening edge, a plurality of roof blocks constituting the roof, By sequentially sliding to the semi-arcuate opening edge on the working yard side at the opening edge, a semi-moon shaped roof structure in plan view is formed on the upper part of the semi-arcuate shape, and then this roof structure is attached to the structure of the frame. It is rotated about the axis by 180 degrees and moved to the semi-arcuate opening edge on the side opposite to the working yard at the opening edge. Next, from the working yard, a plurality of roof blocks constituting the roof are moved to the working yard side. Semi-circular opening Order is placed by sliding in,
Each roof block closes the opening of the skeleton, and then the upper edge of the side wall and each roof block are connected by a ring beam.

According to a second aspect of the present invention, an underground tank for constructing a bottomed cylindrical skeleton composed of a side wall and a bottom slab in the ground and then constructing a disc-shaped concrete roof at the opening edge of the side wall is also provided. A method of constructing a roof, wherein the roof is constructed in a working yard on the ground to the side of the opening edge, and then the roof is slid and placed on the opening edge, and then the side wall It is characterized in that the upper edge and the roof are connected by a ring beam.

[0009]

According to the underground tank roof construction method of the present invention,
According to the first and second aspects, the roof can be constructed without constructing the supporting work inside the skeleton. For this reason, the construction cost can be significantly reduced, and other construction for the side wall and the bottom slab of the skeleton can be performed in parallel with the construction of the roof.
The construction period required to build the entire underground tank will be greatly reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment corresponding to claim 1 of the present invention will be described below with reference to the drawings.

FIG. 1 shows a bottomed tubular frame body which is constructed in the ground G and comprises a tubular side wall 2 and a bottom slab 3. This skeleton 1 is an excavation hole 4 formed by excavating the ground G.
After providing the earth retaining wall 5 on the inner wall of the cylinder in a cylindrical shape, first, the concrete bottom slab 3 is constructed, and then the concrete side wall 2 is erected on the periphery of the bottom slab 3 while applying the concrete side wall 2 to the earth retaining wall 5. It is built and built.

An annular opening edge 2a which is the upper edge of the side wall 2
Is substantially flush with the surface of the ground G, and in this case, the side of the ground G on the right side of the opening edge 2a in the drawing is the work yard 6 for roof construction.

The method of this embodiment for constructing a concrete roof on the frame 1 will be described. First, as shown in FIG. 2, roof blocks 7, 8 and 9 constituting the roof are respectively installed in the work yard 6. To construct.

The roof blocks 7, 8 and 9 are connected to each other to form a half-moon shape in plan view which constitutes a half of a dome-shaped roof, and the joint end faces along the diametrical direction of these roof blocks are divided lines. Each of them is divided into approximately three parts. Each of the roof blocks 7, 8 and 9 has a dome shape as a whole, and concrete roof bodies 7a, 8a and 9a formed in a convex shape upward are reinforced by beams 10 extending along the joint end face direction. It has a different structure. Further, the outer peripheral edge of each roof body 7a, 8a, 9a is formed to have substantially the same R as that of the opening edge 2a so as to be placed on the opening edge 2a of the side wall 2 of the frame 1.

Further, the above three roof blocks 7, 8, 9
From the working yard 6 to the opening edge 2a
A pair of rails 11a, 11b, 11c corresponding to the blocks 7, 8, 9 are spread over the rails, and the rails 11a, 11 are provided on the lower surfaces of the outer peripheral edges of the roof blocks 7, 8, 9 respectively.
b, 11c and a moving means (not shown) such as a carriage that is movable along the opening edge 2 are attached. When the roof blocks 7, 8 and 9 are constructed, the joint end faces thereof are in a state of being orthogonal to the rails 11a, 11b and 11c.

Next, as shown in FIG. 3, by moving the roof blocks 7, 8 and 9 in this order along the rails 11a, 11b and 11c with a propulsion device such as a jack (not shown), The slide is successively slid onto the opening edge 2a. The roof blocks 7, 8 and 9 are jacked up to provide rails 11a, 11b and 11c.
Put on. As a result, the roof blocks 7, 8 are attached to the semi-arcuate opening edge 2a of the opening edge 2a on the side of the work yard 6.
9 is placed in a joined state. If necessary, these roof blocks 7, 8 and 9 are connected to form a roof structure 12 having a half-moon shape in plan view.

Next, as shown in FIGS. 4 and 5, the roof structure 12 is driven by a propulsion device such as a jack (not shown).
Is rotated 180 degrees about the longitudinal center of the exposed joint end surface of the roof 7, that is, about the axis of the frame 1 (in the direction of arrow A in FIG. 4), and the side 6a opposite to the working yard 6a at the opening edge 2a. To the opening edge 2a having a semi-circular arc shape. Then, after jacking up and removing the dolly, the roof structure 12 is placed on the opening edge 2a.

In parallel with the above steps, the other roof blocks 7, 8 and 9 are similarly constructed in the working yard 6, and the roof structure 12 is provided on the opening edge 2a on the side opposite to the working yard 6a as described above. After moving to the semi-circular opening edge 2a, the roof blocks 7 and
8 and 9 are moved along the rails 11a, 11b, and 11c, respectively, and the semicircular arc-shaped opening edge 2a on the working yard 6 side is moved.
Then slide and place it on. As a result, the opening of the body 1 is closed by the two roof blocks 7, 8, and 9. That is, each of these two roof blocks 7,
A roof 13 is constructed by 8 and 9. Next, as shown in FIG. 5, along the outer periphery of the roof 13, a temporary P
The C steel material 14 is wound in the circumferential direction and tensioned to introduce prestress, and the roof blocks 7, 8 and 9 are connected to each other.

Thereafter, as shown in FIG. 6, a ring beam 15 made of cast concrete is constructed over the entire circumference at the joint between the outer periphery of the upper edge of the side wall 2 and the roof blocks 7, 8 and 9. , In this ring beam 15 a plurality of P
The C steel material 16 is stretched over the entire circumference in the circumferential direction, the PC steel materials 16 are tensioned and the state is fixed, and prestress is introduced into the ring beam 15.

As described above, the roof 13 is constructed on the skeleton 1, and finally the disc-shaped and dome-shaped roof 13 and the underground tank 17 comprising the skeleton 1 are constructed.

The roof blocks 7, 8 and 9 may be moved by means of rollers or the like in addition to the above wheels. Further, these moving means are removed when the roof blocks 7, 8, 9 are positioned, and the lower surfaces of the outer peripheral edges of the roof blocks 7, 8, 9 are directly placed on the opening edge 2a.

According to the method of constructing a roof according to the method of this embodiment,
Unlike the conventional case, the roof 13 can be constructed without constructing the supporting work inside the body 1, and therefore the construction cost can be significantly reduced.

Further, for example, the inner surface of the side wall 2 of the frame 1 and the bottom plate 3
In addition, finish construction such as rust prevention processing work, etc.
This can be done in parallel with the construction of the roof 13, and therefore, the construction period required to construct the entire underground tank 16 is significantly shortened.

Further, since the working yard 6 for constructing the roof blocks 7, 8, 9 may be one side, which is one side, rather than the entire area around the place where the underground tank 16 is constructed, the space required for the construction is also It has the advantage of not being so wide.

FIG. 7 shows an embodiment corresponding to claim 2 of the present invention. In this embodiment, in the working yard 6, a concrete roof 20 is preliminarily constructed at once,
Then, this roof 20 is slid to the opening edge 2a of the side wall 2 in the frame 1 in the same manner as described above, and thereafter, although not shown, it is connected to the frame 1 by the ring beam as in the above embodiment. Therefore, this method also has the same effect as that of the above-described embodiment.

[0026]

As described above, according to the method for constructing the roof of the underground tank of the present invention, the roof can be constructed without constructing the supporting work inside the skeleton as in the conventional case, and therefore the construction cost can be reduced. Along with the significant reduction, the construction of the side wall and bottom slab of the skeleton can be done in parallel with the construction of the roof, resulting in a significant reduction in the construction period required to construct the entire underground tank. Play.

[Brief description of drawings]

FIG. 1 is a side view showing a body constructed in the ground.

FIG. 2 shows a first embodiment according to claim 1 of the present invention.
It is a perspective view which shows a step.

FIG. 3 is a perspective view of the same second stage.

FIG. 4 is a plan view of the same third stage.

FIG. 5 is a perspective view after the end of the third step.

FIG. 6 is a side sectional view showing a state in which a roof and a skeleton are connected by a ring beam.

FIG. 7 is a side view of an embodiment corresponding to claim 2 of the present invention.

[Explanation of symbols]

 1 frame 2 side wall 2a opening edge 3 bottom plate 6 working yard 6a anti-working yard side 7, 8, 9 roof block 12 roof structure 13, 20 roof 15 ring beam 17 underground tank G ground

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000206211 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (71) Applicant 000174943 Mitsui Construction Co., Ltd. 3--10-1, Iwamoto-cho, Chiyoda-ku, Tokyo No. (72) Inventor Koji Minegishi, 1-2-2 Kochi, Ichikawa-shi, Chiba Sunny House Minami Gyotoku B-213 (72) Inventor, Yoshinori Kawamura 3-34, Akatsukashinmachi, Itabashi-ku, Tokyo Urban Life Yuri no Ki Dori 1 Building No. 305 (72) Inventor Hirofumi Yamashita 2-3, Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation (72) Inventor Seiichi Oki 2-3-3 Kanda-shi, Chiyoda-ku, Tokyo Obayashi Corporation ( 72) Inventor Masamichi Yasunaga Within Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Takeuchi et al. Moto-Akasaka, Minato-ku, Tokyo Chome 3-8 Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Masanobu Kuroda 1-32 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Atsushi Sejima 1-chome Shibaura, Minato-ku, Tokyo No. 2-3 Shimizu Corporation (72) Inventor Tsutomu Saito 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo 1-Taisei Construction Co., Ltd. (72) In-house Mineo Kobayashi 1-25-25, Nishishinjuku, Shinjuku-ku, Tokyo No. 1 in Taisei Construction Co., Ltd. (72) Inventor Muneki Watanabe 3-10-1, Iwamoto-cho, Chiyoda-ku, Tokyo 1 Mitsui Construction Co., Ltd. (72) Takemasa Yamada 3--10-1 Iwamoto-cho, Chiyoda-ku, Tokyo No. Mitsui Construction Co., Ltd.

Claims (2)

[Claims] 1. A method of constructing a roof for an underground tank, comprising constructing a bottomed cylindrical frame body comprising a side wall and a bottom slab in the ground, and then constructing a disc-shaped concrete roof at the opening edge of the side wall, From the working yard on the ground to the side of the opening edge, a plurality of roof blocks forming the roof are sequentially slid to the semi-arcuate opening edge of the opening edge on the working yard side. A plan view half-moon shaped roof structure is formed on the upper part of the
It is rotated by 80 degrees and moved to the semi-arcuate opening edge on the side opposite to the working yard on the opening edge. Next, from the working yard, a plurality of roof blocks constituting the roof are moved to the semi-arcuate shape on the working yard side. It is slid on the opening edge one by one and placed, and each roof block closes the opening of the skeleton. After that, the upper edge of the side wall and each roof block are connected by a ring beam. Roof construction method. 2. A method for constructing a roof for an underground tank, comprising constructing a bottomed cylindrical frame body comprising a side wall and a bottom slab in the ground, and then constructing a disc-shaped concrete roof at the opening edge of the side wall, In the work yard on the ground on the side of the opening edge,
The roof is constructed, and then the roof is slid to be placed on the opening edge, and thereafter, the upper edge of the side wall and the roof are connected by a ring beam. Method.