JPH0711645U - Large storage tank - Google Patents

Abstract

(57) [Abstract] [Purpose] The work volume for the inner surface of the roof is evenly distributed over the entire area, and for the work to attach the insulation material and the membrane, the work efficiency is improved and the construction period is shortened by using the attached work platform. It is a rational attempt. [Structure] A plurality of sets of rails 7 are concentrically arranged over substantially the entire area inside the storage tank roof 1, work scaffolds B are suspended on the rails of each set, and work is performed from the central portion to the outer peripheral portion. The number of scaffolds B is increased, the work amount of each work scaffold B is equalized, a rail is erected on the work scaffold B, and the roof cooler 2 and the membrane-equipped work platform 16 movable on the work scaffold B are provided. It is characterized by being arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a large-sized storage tank such as an underground storage tank with an improved work scaffolding suspended from the inner surface of the storage tank roof.

[0002]

[Prior art]

 Conventionally, in LNG underground storage tanks where the roof is made of steel, a cold insulation material is stretched over the inner surface of the roof. In order to perform inspection and maintenance of this cold insulator attachment work, whether the cold insulator attachment is correct or whether the cold insulator is damaged, etc. Scaffolds were erected. This work scaffold has a length corresponding to the radius of the roof, one end of which is supported by a structure such as a manhole provided at the center of the roof, and the other end of which is a radial structure supported by the upper edge of the tank body. Therefore, while rotating around the manhole part, work such as installation of cold insulation material, inspection, and maintenance was performed. (See, for example, Japanese Utility Model Laid-Open No. 63-94253).

[0003]

[Problems to be solved by the device]

 In the work scaffolding as described above, there is a significant difference in the work area between the central part of the roof and the outer peripheral part, and even if the work is completed in the central part, the work amount is unbalanced such that the peripheral part is still working. Yes, there is a problem of impeding work efficiency. Further, there is a limit even if the number of such scaffolds for work is increased, and even if the number of scaffolds for work is increased, the imbalance of the work amount further increases as it reaches the periphery.

The object of the present invention is to evenly allocate various workloads to the inner surface of the roof over the entire area, and for the work to attach the cold insulation material and the membrane, use an attached work platform to improve the work efficiency and shorten the construction period. Is a rational aim.

[0005]

[Means for Solving the Problems] The structure of the present invention which solves the problems of the prior art has a working scaffold extending radially from the central portion of the roof, which is rotatably and rotatably disposed inside the roof. This is a large storage tank, and multiple sets of rails consisting of two sets are concentrically arranged over almost the entire inside of the roof, and the scaffolds for work are suspended on the rails of each set, and at the center The number of work scaffolds is increased from the portion to the outer periphery, and an attached work platform such as a cold insulator or a membrane is movably mounted on the work scaffold.

[0006]

[Action]

 The work on the inner surface of the roof is performed individually by the work scaffolds that turn around a plurality of sets of concentrically arranged rails. Since the number of work scaffolds increases along the outer periphery of the roof, the work area per unit is equalized, and work progress on the entire inner surface of the roof can be arbitrarily performed for each work scaffold. Also, by arranging the attached work platform on the work scaffold, it is possible to save labor for attaching the cold insulation material and the membrane to the inner surface of the roof.

[0007]

【Example】

 Next, details of the embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional front view, FIG. 2 is a plan view showing an arrangement example of a work scaffold suspended on each set rail, and FIG. 3 is a partially cutaway front view showing a suspension structure of the work scaffold, FIG. 4 is a perspective view of a work state of attaching the membrane using the attachment work platform on the work scaffold, and FIG. 5 is a sectional view of FIG.

The configuration of the large storage tank will be described with reference to FIG. A shown in the figure is a large-diameter LNG underground storage tank having a diameter of 50 to 70 m, and the roof 1 of the storage tank A has a concrete structure in which reinforcing bars (not shown) are embedded. As a matter of course, as shown in FIG. 3, the heat insulating material 2 is attached to the entire inner surface of the roof 1, and the membrane 4 supported by the anchor 3 is stretched on the inner surface. . Further, although not particularly shown, a cooling material is attached to the inner surface of the concrete skeleton 5 constituting the storage tank A and the upper surface of the concrete bottom slab 6, and a membrane is stretched liquid-tightly on the inner surface. There is. In this embodiment, with respect to the storage tank A configured as described above, attention is paid to the fact that there is an anchor 3 for attaching the membrane 4 stretched through the cold insulating material 2 to the roof 1, and this anchor 3 Is used to attach a suspension rail for a work scaffold, which will be described later, and to suspend the work scaffold in which the work amount is evenly distributed over the entire inside of the roof 1.

As shown in FIG. 1 and FIG. 2, a plurality of sets of rails 7 consisting of two sets are laid concentrically around the entire inside of the roof 1, and the rails 7 of each set have a planar shape. The four corners at both ends of the work scaffold B having a rectangular shape whose longitudinal axis extends along the radial direction of the roof 1 are suspended. Further, as is clear from FIG. 2, the number of the work scaffolds B is increased from the central part to the outer peripheral part, and the work amount of the work scaffolds B on each rail is substantially evenly distributed. For example, as shown in FIG. 2, the entire area of the ridge 1 is concentrically divided into central, intermediate, and outer peripheral work zones a, b, and c, and two work scaffolds B are used in the work zone a. By suspending four work scaffolds B in the zone b and six work scaffolds B in the work zone C, the work of the work scaffold B in each work zone a, b, c is performed. The quantities are approximately equalized.

Next, the erection means of the rail 7 will be described with reference to FIG. The anchor 3 is embedded and fixed to the inner surface of the roof 1 having a concrete structure. The anchor 3 is composed of a plurality of bolts, and supports the anchor plate 8 on the inner surface of the roof 1. A support member 10 into which a bolt 9 is screwed is welded to the lower portion of the anchor plate 8, and the central portion of the membrane 4 is supported by the bolt 9 screwed into the support member 10. As described above, since the rail 7 for suspending the working scaffold B is attached using the anchor 3 for attaching the membrane 4, as shown in the figure, the bolt 9 is attached to the support member 10. The coupling member 11 is fixedly coupled. The connecting member 11 is fixed to the rail 7, and the rail 7 is attached concentrically around the roof 1. The rail 7 has an I-shaped steel structure, and on both sides of the lower side of the rail 7, rolling wheels 13 mounted on a channel-shaped connecting body 12 are mounted and supported. To this connecting body 12, there are fixed pillar rods 14 suspended from the four corners of the scaffold B for work. Although FIG. 3 shows only a part thereof, this illustrated configuration is provided at the four corners of the work scaffold B, and the work scaffold B is suspended so as to be able to travel between two parallel rails 7. It Further, as a traveling means of the work scaffold B with respect to the rail 7, a manual operation by an operator, a means by an operation of a pulley mechanism (not shown) attached to the shaft of the wheel 13 is adopted. When the work scaffolds arranged in the work zones a, b, and c are arranged in series in the same radial direction, the work scaffolds B can be connected and the work scaffold B in the central portion is roofed. It is made to communicate with the manhole 15 provided at the center of No. 1 so that the worker can come in and out at the start and end of the work.

Referring to FIGS. 4 and 5, the roof cold insulator and the membrane-attached work platform will be described. On the scaffold B for work, rails 17 consisting of one set of two articles are laid in a straight line in the radial direction, and the rail 17 is mounted on the rail 17. The membrane 4 is attached by the jack 18 provided on the attachment work platform 16 which can be moved along. Although not shown in particular, the cooling material 2 is also attached in the same manner. However, since the shape of the membrane 4 and the cold insulating material 2 differs depending on the attachment position, the jack 18 can be arbitrarily changed in position, although not shown. In addition, when moving the attached work platform to the work scaffolds located in other work zones, the work scaffolds are connected in the same radial direction as described above, and the work scaffolds are connected in the same manner. The rail 17 is also connected to the rails of other work scaffolds so that the attached work platform can be moved. Other supporting equipment may be mounted on the attached work platform 16.

Although the roof 1 has a concrete structure in the above-described embodiment, the same effect can be obtained even if the roof is made of steel, and therefore the roof 1 is not limited to the illustrated embodiment. Further, although it has been described that the membrane 4 and the supporting anchor 3 are used as the supporting means for constructing the rail 7, it is not limited to the configuration of the embodiment because other means is also possible.

[0013]

[Effect of device]

 As described above, according to the configuration of the present invention, the following effects can be obtained. (A) Multiple sets of rails are concentrically arranged on the inside of the roof, and the scaffolds for work are suspended on the respective rails so as to be pivotally rotatable. Various operations can be performed on the inner surface of the root, and work efficiency can be improved. (B) Since the number of scaffolds for work is increased from the central part to the outer circumference part, the work area per scaffold for each work can be equalized, and work efficiency can be improved and the construction period can be shortened reasonably. You can do it. (C) It is possible to save labor by installing the cold insulation material and the membrane by using the attached work platform, and it is possible to reasonably improve the work efficiency and shorten the construction period.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view.

FIG. 2 is a plan view showing an arrangement example of work scaffolds suspended on each set rail.

FIG. 3 is a partially cutaway front view of a main part showing a suspension structure for a work scaffold.

FIG. 4 is a perspective view of a work state of attaching a membrane using an attachment work platform on a work scaffold.

FIG. 5 is a cross-sectional view of a work state of attaching a membrane using an attachment work platform on a work scaffold.

[Explanation of symbols]

 A Storage tank B Working scaffolding 1 Roof 2 Cooling material 3 Anchor 4 Membrane 7 Rail 8 Anchor plate 9 Bolt 10 Supporting member 11 Connecting member 12 Connecting body 13 Rolling wheel 14 Pillar rod 15 Manhole 16 Work platform 17 Rail 18 Jack

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Kawahara 1-4-38 Wakaba-cho, Chofu-shi, Tokyo (72) Creator Tomomi Goto 118 Futtsuka, Noda-shi, Chiba Kawasaki Heavy Industries Ltd. Noda factory (72) Devised Person Masashi Yamazaki 118 Futatsuzuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries, Ltd. Noda Factory (72) Inventor Osamu Tadami 118 Futatsuzuka Noda City, Chiba Prefecture Noda Factory, Kawasaki Heavy Industries Ltd. (72) Inventor Koji Oi Noda, Chiba Prefecture 118 Futtsuka, Ichikawa City Kawasaki Heavy Industries Ltd. Noda Factory

Claims (2)

[Scope of utility model registration request] 1. A large storage tank in which a working scaffold extending in a radial direction from a central portion of the roof is rotatably and rotatably arranged inside the roof, and two sets of two sets are provided over substantially the entire inside of the roof. Characterized by arranging a plurality of sets of rails concentrically and suspending work scaffolds on the rails of each set, and increasing the number of work scaffolds from the central part to the outer peripheral part A large storage tank. 2. The large-sized storage tank according to claim 1, wherein an attached work platform such as a cold insulating material and a membrane is movably mounted on the work scaffold.