JPS6160229B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention automatically prevents main members such as side plates from tilting during the process of vertically assembling main members in the floating construction method of cylindrical tanks for oil storage etc. This invention relates to a construction method that allows for easy and accurate inspection as well as horizontal correction, and in particular, the invention relates to a construction method that allows for easy and accurate inspection. This invention relates to a method of constructing a cylindrical tank in which the tank is restrained via tension members from both sides and pulleys of the struts.

<Prior Art> As is well known, floating construction methods have been widely adopted in the construction of cylindrical tanks such as oil storage tanks.

Therefore, in the floating construction method, it is an extremely important technical matter to prevent the main members of the tank body from tilting in the floating state, and various preventive measures have been proposed to date. I have been hired.

<Problems to be Solved by the Invention> However, conventional tilt prevention technology uses a large number of various temporary members to counter the horizontal force and uplift force that occur on construction supports when tilt occurs. This not only has the disadvantage of increasing the cost of materials for temporary members, but also has the disadvantage that assembly and disassembly are complicated, and it takes a lot of labor and time to prevent tilting during the construction process. It was hot.

In particular, there has been a strong desire to prevent tilting of the bottom plate due to safety issues during welding and inspection from below.

The purpose of this invention is to solve the technical problem of anti-tilt technology in floating construction of a cylindrical tank based on the above-mentioned conventional technology, and to solve the problem by automatically maintaining the bottom plate of this member horizontally at all times. Accurate construction,
It is an object of the present invention to provide an excellent construction method for a cylindrical tank that can be inspected and is beneficial to the field of tank utilization in the energy industry.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of the present invention, which is summarized in the above-mentioned claims, is to solve the above-mentioned problems. For a pulley installed on a pair of diametrical supports erected from the foundation, the main body of the bottom plate is locked to wires from both sides, and when one side of the bottom plate tilts, the other side automatically moves. responded in a restrained state, immediately leveled the
Construction work is carried out with the bottom plate of the main component being reliably maintained horizontally at all times, and at the same time, the bottom plate of the main component, which is maintained in a horizontal state, is suspended and supported from a wire via a hook member. Technical measures have been taken to ensure that inspections, etc. can be carried out reliably and smoothly without distortion.

<Example> Next, an example of the present invention will be described below with reference to the drawings.

In the principle mode shown in Figures 1, 2, 3a, and 3b, one support at the bottom of each of the support columns 2, 2, which is made up of a pair of supports 2, 2 facing each other on a diameter passing through the center of the tank on the tank annular part. Pulley 3 as a pulley,
Further, two pulleys 4 and 5 are provided on the upper part, and are loosely inserted into shafts 6 and 7 extending through the pillars 2 and 2, respectively.

Then, for floating construction, the bottom plate 8 is equipped with a sealing material 9 on the outer edge as appropriate, and the bottom plate deflection prevention material 10 is erected and supported at a predetermined position on the foundation 11, and temporarily fixed to the pillars 2, 2. The roof 1 as the main component of the frame
The side plate 13 with two attachments is airtightly floated and supported on the bottom plate 8 via the sealing material 9 using air pressure as is well known.

As shown in FIGS. 1 and 3a, during the construction process of the side plate 13, the pillars 2,
A wire 16, one end of which is locked and fixed to the hook 15 at the upper end corresponding to 2, is connected to one of the upper pulleys 4.
It engages with the pulley 5 on the other side and hangs down, passing through the center of the tank, as shown in Fig. 3b, and lowering the pulley 3 below. It is engaged with and extends upward again to be locked and fixed to the hook 17 at the lower end of the side plate reinforcing member 14 on the other side.

On the other hand, as shown in FIG. 3a, the side plate reinforcing member 14
The wire 18, whose one end is locked and fixed to the hook 17 at the lower end, extends downward, engages with the lower pulley 3 of the column 2, extends upward again, engages with the other pulley 5 at the upper end, and is stretched horizontally. is engaged with the non-compatible upper pulley 4 of the opposing support column 2 and hangs down, and the side plate reinforcing member 1 on the other side
The other end is locked and fixed to the upper hook 15 of 4.

Therefore, as soon as the side plate reinforcing member 14 on one side moves up and down, the side plate reinforcing member 14 on the other side automatically moves up and down along with it via the wires 16, 18 and pulleys 3, 4, 5, so that both sides are always moved up and down. They will be on the same level.

Therefore, there is an evenly distributed load 19 on each part due to the pressure of the air press-fitted between the bottom plate 8, roof 12, and side plate 13, and partial tilting occurs when welding the next side plate 13 to the lowest side plate 13'. Even if this occurs, the tilting of the main members of the construction frame is immediately and completely automatically prevented.

Therefore, as shown by the arrow, the air pressure is increased by known means to raise the side plate 13 with the roof 12 one step at a time, and construction of the side plate is continued.

Further, as in the embodiment shown in FIG. 4, the wires 16 and 18 are engaged with the side plate reinforcing member 14 in a manner that they are engaged with the upper and lower hooks 20 and 21 provided on the periphery of the bottom plate 8, thereby making it possible to Pillar 2,
2. The devices of pulleys 3, 4, and 5 are used for the same function, and the bottom plate 8, the foundation 11, and the side plate 1 are automatically leveled.
Of course, it is also possible to use the method of floating the tank bottom plate 8 by filling the gas pressure 22 between 3 and 3.

In addition, in the above-mentioned construction, when the side plate 13 has already been constructed, the pillars 2, 2 are attached to the side plate 1 at their upper ends.
A connecting member 23 is disposed between the inner surface of the member 3 and the inner surface of the member 3.

In the embodiment shown in FIG. 1 described above, the horizontal force A generated on the columns 2, 2 can be determined by the opposing force on the bottom plate 8 which is temporarily fixed to the columns 2, 2. Regarding the levitation force b, it is possible to sufficiently counter the levitation force b due to the internal pressure applied to the bottom plate 8, and even in the case of the embodiment shown in FIG. I can do it.

An example will be described based on the above-mentioned principles. In the case of floating construction of the bottom plate 8, there is welding work from the bottom surface of the bottom plate 8.
When performing line inspection inspection work, it goes without saying that
Various operations are required below the bottom plate 8.

In that case, the deflection of the bottom plate 8 creates various adverse conditions, and therefore, measures to prevent deflection are required.

Therefore, in the present invention, as shown in the embodiment shown in FIG. At the same time, a predetermined number of hook members 25, 25, . Perform line inspection work.

In the above embodiments, the tension body and the pulley were wires and pulleys, but the invention is not limited thereto.
Of course, a chain and sprocket method is also possible.

<Effects of the Invention> As described above, according to the present invention, in the cylindrical tank construction method, both diametrical ends of the bottom plate of the main member of the frame are connected inwardly through pillars vertically extending from the foundation. By restraining each pillar with a pulley and wires from both sides, the vertical movement of one side can immediately and automatically respond to the vertical movement of the other side, so that the bottom plate always moves automatically during the construction process. are at the same level and therefore always maintained horizontally,
This has the excellent effect of accurately preventing tilting.

Therefore, not only can construction be carried out quickly and accurately, but equipment such as supports, wires, and pulleys can be simple, so the cost of these ancillary equipment is low, and there are additional benefits of good workability.

Additionally, by interposing a hook material between the wire and the bottom plate, in addition to the above effects, the bottom plate can be maintained horizontally without distortion, which allows for accurate welding and inspection work at the bottom of the bottom plate. , and has the effect of being able to be performed smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a general schematic vertical sectional view of the principle aspect, FIG. 2 is a schematic plan sectional view thereof, and FIGS. 3a and 3b are perspective views of the tilt prevention mechanism. FIG. 4 is a partial longitudinal sectional view of another embodiment, and FIG. 5 is a partial longitudinal sectional view of the embodiment. 12, 13, 13', 8, 8'...Tank body,
13, 8, 8'...Main member, 8...Bottom plate, 2...
Pillar, 3, 4, 5...pulley, 16, 18... wire, 25... support material.

Claims (1)

[Claims] 1. In a cylindrical tank construction method in which the main members of the tank body are constructed while automatically correcting the inclination of the main members in the process of assembling them in the vertical direction, both diametrical ends of the bottom plate of the above-mentioned main members are placed close to the base plate. The vertical movement of one side is automatically compensated for by the pulley of each pillar via the vertical pillar, and the vertical movement of the other side is restrained by the wires that are engaged with each pulley from both sides. The cylindrical type is characterized in that both sides are always at the same level during construction by reacting with vertical movement, and the bottom plate is maintained flat from the wire through the hook member. Tank construction method.