TW201508145A - Method for constructing cylindrical tank - Google Patents

Abstract

This is a method for constructing a cylindrical tank that has a metal inner vessel and a concrete outer vessel. This method includes: a step of assembling a knuckle plate (9) inside the outer vessel; a step of providing a plurality of hanged parts (10b) on the knuckle plate (9); a step of providing a plurality of space keepers (11) on an outer circumferential surface of the knuckle plate (9) in a circumferential direction thereof such that the space keepers (11) protrude outwardly from the outer circumferential surface of the knuckle plate (9); a step of providing a plurality of hanging parts on side walls of the outer vessel; a step of mounting a plurality of jack-up devices between the plurality of hanging parts on the side walls of the outer vessel and the plurality of hanged parts on the knuckle plate (9); and a step of assembling the metal inner vessel by hanging up and raising the knuckle plate (9) using the jack-up devices and mounting inner vessel side plates (7) below the raised knuckle plate (9). With this construction, it is possible to provide a method for constructing a cylindrical tank in which the break in the inner vessel roof side and the outer vessel can be prevented even if the inner vessel roof side, which is jacked up, is greatly moved in the horizontal direction.

Description

Construction method of cylindrical groove

The present invention relates to a method of constructing a cylindrical groove.

This application claims priority based on the application No. 2013-135161 filed on June 27, 2013 in Japan, and its content is hereby incorporated herein.

A cylindrical tank having a double-shell structure of an inner tank and an outer tank is used for storage of cryogenic liquids such as LNG (liquefied natural gas), LPG (liquefied petroleum gas), and the like. Patent Document 1 discloses a construction method of a cylindrical groove having an inner groove made of metal and an outer groove made of concrete.

Patent Document 1 discloses a method of simultaneously constructing an inner groove made of metal and an outer groove made of concrete, in order to shorten the construction period of the cylindrical groove. Specifically, a lifting platform is erected on the bottom of the outer tub to support the lifting device at a predetermined height (refer to FIG. 4(b) of Patent Document 1). Then, when performing the side wall engineering of the outer tank, the inner tank roof and the outer tank roof are assembled on the bottom of the outer tank, and then the inner tank roof and the outer tank roof are raised by the lifting device, and the inner layers of the plurality of layers are simultaneously The groove side plates are sequentially installed on the inner groove roof from the uppermost layer to the lowermost layer. Thereby, the simultaneous construction of the metal inner groove and the concrete outer groove is realized.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 7-62924

However, in the above prior art, the inner trough roof and the outer trough roof are raised by the lifting device, and the inner trough side plates are simultaneously installed on the inner trough roof. In this way, during the period of lifting the roof of the inner tank and the roof of the outer tank, or when the roof of the inner tank and the roof of the outer tank are suspended, if an earthquake or strong wind occurs, the roof of the inner tank and the roof of the outer tank may be in the outer tank. The possibility of large displacement in the horizontal direction. In this way, in particular, the mounting portion of the lifting device for the inner trough roof protrudes outward, and this collides with the inner wall surface of the outer trough, and the inner trough roof is damaged, and the outer trough is damaged due to the concentration of the mounting portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for constructing a cylindrical groove, during which the lifting device lifts the roof of the inner tank or during the period of suspension thereof due to the influence of earthquakes or the like. When the inner trough roof is largely displaced in the horizontal direction, even if the inner trough roof collides with the outer trough, the inner trough roof and the outer trough can be prevented from being damaged.

A first aspect of the present invention is a method for constructing a cylindrical groove for constructing a cylindrical groove having a metal inner groove and a concrete outer groove, comprising: assembling an annular shape on the inner side of the outer groove The work of the folding portion; the project of connecting a plurality of suspended portions connected to the plurality of lifting devices to the folding portion; protruding from the outer circumferential surface of the folding portion a plurality of gap maintaining members disposed along a circumferential direction of the outer peripheral surface; a plurality of hanger portions for suspending the plurality of lifting devices are disposed on a side wall of the outer groove; respectively a lifting device is mounted between the plurality of hanger portions of the side wall of the outer groove and the plurality of suspended portions of the folding portion; and the folding portion is suspended by the plurality of lifting devices The inner groove side plate is attached to the lower side of the aforementioned folded portion after the ascent to assemble the inner groove.

Further, in a second aspect of the present invention, in the method of constructing the cylindrical groove according to the first aspect, the plurality of gap maintaining members are disposed between the plurality of suspended portions.

Further, in a third aspect of the present invention, in the method of constructing the cylindrical groove of the first or second aspect, the distance from the center of the folded portion to the outer end of the gap maintaining member becomes larger than the aforementioned folding The plurality of gap holders are disposed such that the distance from the center of the portion to the outer end of the suspended portion is the length.

Further, a fourth aspect of the present invention is the method of constructing the cylindrical groove of the first or second aspect, wherein the outer end of the plurality of suspended portions and the outer end of the plurality of gap maintaining members are located The plurality of suspended portions and the plurality of gap maintaining members are disposed on the same circumference.

Further, a fifth aspect of the present invention is the method of constructing the cylindrical groove of the first to fourth aspects described above, wherein the folding portion is attached to the pre-assembled circle in the process of assembling the folding portion. The upper side of the annular inner groove side plate, thereby assembling the aforementioned folding portion, and assembling the inner groove The inner groove side plate of the next layer is attached to the inner groove side plate of the lower side of the folding portion which is raised by the plurality of lifting devices.

Further, in a sixth aspect of the present invention, in the method of constructing the cylindrical groove of the first to fifth aspects, the engineering system for assembling the inner groove has an inner groove mounted on a lower side of the folding portion. And processing a side panel; and processing a plurality of second hanger portions above the plurality of hanger portions of the sidewall of the outer slot between the processing of installing the other inner slot side plates under the inner groove side plate; Disposing the plurality of lifting devices between the plurality of second hanger portions and the plurality of hanging portions, respectively, and lifting the folding portion upward by the plurality of lifting devices to raise the lifting device deal with.

According to the method of constructing the cylindrical groove of the present invention, a plurality of gap maintaining members projecting outward from the outer circumferential surface of the folded portion are provided along the circumferential direction of the outer peripheral surface. Accordingly, when the folding portion is lifted and raised by the lifting device, or during the rising period, the folding portion is largely displaced in the horizontal direction due to the influence of an earthquake or the like, and the gap maintaining member is located at the outer groove and the folding portion. Between the joints, the space between the outer groove and the folded portion is substantially reduced. As a result, the amount of displacement of the folded portion can be reduced, and the impact of the folded portion against the outer groove can be alleviated. Further, when the gap maintaining member collides with the outer groove, the burden at the time of collision can be dispersed as compared with the case where the hanging portion of the folded portion only collides with the outer groove. Accordingly, it is also possible to prevent the destruction of the groove due to the concentration of the load.

1‧‧‧Basic plate (bottom of the outer trough)

2‧‧‧Internal groove anchor

3‧‧‧Side wall of the outer trough (PC wall)

4‧‧‧ construction port

5‧‧‧Overhanging scaffolding

6‧‧‧With foot stand

7‧‧‧Inch side panel

8‧‧‧ Roof gantry

9‧‧‧Folding board (folding department)

10‧‧‧Folding support

10a‧‧‧Support board

10b‧‧‧ hanging board (hanging part)

10c‧‧‧ reinforcing plate

10d‧‧‧ gap

11‧‧‧ gap maintenance parts

11a‧‧‧H steel

11b‧‧‧ steel plate

12‧‧‧ Roof bone

13‧‧‧ hanging basket track

14‧‧‧Inner roof (slot roof)

16‧‧‧Rings

16a‧‧‧ring plate

17‧‧‧ Cranes for cranes

18‧‧‧ hanging platform (suspension unit)

19‧‧‧ Lifting device

19a‧‧‧Bolts

20‧‧‧ Lifting pole

20a‧‧‧ jack body

20b‧‧‧ pole

21‧‧‧hanging balance

21a‧‧‧balance pole

21b‧‧‧heavy hammer

22‧‧‧Bottom cold and thermal impedance tempering material

23a, 23b‧‧‧Pearlite concrete blocks

24‧‧‧Lightweight concrete blocks for structural use

25‧‧‧Second hanger (second hanger)

26‧‧‧Outer trough roof

27‧‧‧ Materials

28‧‧‧Working scaffolding

100‧‧‧Cylinder groove

X‧‧‧ring area

Y‧‧‧ trough components

Fig. 1 is a side sectional view for explaining an engineering in an embodiment of the present invention.

Fig. 2 is a side sectional view for explaining an engineering in an embodiment of the present invention.

Figure 3 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Fig. 4 is a side sectional view showing an important part of the mounting state of the folding support and the gap maintaining member.

Fig. 5 is a plan view showing an important part of the mounting state of the folding support and the gap maintaining member.

Fig. 6 is a plan view showing the roof side of the roof bone including the outer groove roof in the mounted state of the folding support and the gap maintaining member.

Figure 7 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 8 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Fig. 9 is a side sectional view showing an important part of the construction in an embodiment of the present invention.

Figure 10 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 11 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 12 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 13 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 14 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 15 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 16 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 17 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

Figure 18 is a side cross-sectional view for explaining an engineering in an embodiment of the present invention.

An embodiment of the method of constructing the cylindrical groove of the present invention will be described in detail below with reference to the drawings. Further, in the following drawings, the ratio of each member is appropriately changed in order to draw each member into a recognizable size. In the following description, a PC (prestressed concrete) double-shell storage tank in which the above-mentioned type of LNG is stored is exemplified as a cylindrical groove.

First, as shown in Fig. 1, a project of a substantially circular plate-shaped base plate (bottom of the outer groove) 1 is performed, and a bottom lining (not shown) is formed on the upper surface of the base plate 1. At this time, in the present embodiment, the inner groove anchor 2 is provided along the circumferential direction of the base plate 1 near the inner peripheral edge portion of the base plate 1.

Next, a part of the side wall (PC wall) 3 of the outer groove is formed on the outer peripheral edge portion of the base plate 1 near the outer groove anchor 2, for example, formed to the entire The portion is a fifth layer (# 5) of the side wall 3 formed by stacking nine layers.

Moreover, the construction port 4 is formed on the lower layer side of a part of the side wall (PC wall) 3 of the outer groove, for example, from the second layer to the third layer. In addition, since the side walls of the remaining layers are accumulated on a part of the side wall 3 to finally form the side walls 3 formed of nine layers, it is necessary to assemble a template for accumulating the remaining layers. Therefore, on the upper side of a part of the side wall 3, for example, a portion of the fourth layer or more is provided with a depending eagle 5.

After forming a part of the side wall 3 of the outer tank in this manner, a plurality of footrests 6 for assembling the inner groove side plates are provided on the inner surface side of the side wall along the circumferential direction thereof. The foot stand 6 is a door type gantry for supporting the inner groove side plate 7 to be described later. The foot stand 6 is provided on the base plate 1 so as to span the annular region X. The annular region X is a region in which a cylindrical inner groove formed by combining a plurality of inner groove side plates 7 is finally lowered.

Next, as shown in Fig. 2, concrete is placed on a part of the side wall 3 to form a side wall of the sixth layer (#6). Further, when the side wall 3 is constructed, the overhanging eagle 5 is sequentially moved upward as the upper side of the side wall 3 is formed in order.

Further, in parallel with this, on the foot stand 6, a plurality of inner groove side plates 7 which are a part of the side walls of the inner groove are erected along the circumferential direction of the side wall 3, and the inner groove side plates adjacent to each other in the lateral direction are provided. 7 integrally welded. Thereby, each of the inner groove side plates 7 is assembled into an annular shape. Moreover, the inner groove side plate 7 assembled in this case is the inner groove side plate 7 of the uppermost layer (the ninth layer "#9" in the present embodiment). The inner groove side plate 7 is formed of Ni steel or the like having excellent toughness and strength.

Further, in the interior of the side wall 3, the roof gantry 8 is assembled at the central portion of the base plate 1.

Next, as shown in Fig. 3, a plurality of knuckle plates 9 (folding portions) are attached to the upper end portion of the uppermost inner groove side plate 7, whereby the folding plate 9 is assembled. The folding plate 9 is connected to the outer peripheral edge portion of the inner tank roof 14 to be described later, and is bent downward. As described above, the upper end portion of the uppermost inner groove side plate 7 is connected to the lower end portion of the folding plate 9.

As shown in FIGS. 4 to 6, a folding support 10 and a gap maintaining member 11 are attached to the outer peripheral surface of the folding plate 9. In the present embodiment, as shown in FIG. 6, a plurality of (for example, 30) folding support members 10 are provided at equal intervals along the circumferential direction of the folding plate 9, between the folding support members 10 Each of the spacers 11 is provided. Further, in Fig. 6, reference numeral 12 denotes a roof bone of a groove roof which will be described later, and reference numeral 13 denotes a basket rail.

The folding support 10 is made of a steel plate and forms a suspended portion that is coupled to a lifting device to be described later. As shown in FIGS. 4 and 5, the folding support 10 is composed of a pair of support plates 10a and 10a which are formed in a side view by a slight triangle when viewed from the side; the plane between the support plates 10a and 10a is slightly square. The hanging plate 10b is sandwiched between the support plates 10a and 10a, and is coupled to the upper surface of the suspended plate 10b to form a reinforcing plate 10c between the reinforcing support plates 10a and 10a and the suspended plate 10b.

As shown in Fig. 4, the one side portions of the support plates 10a and 10a are bent in accordance with the curved shape of the folding plate 9, and are fixed to the curved surface of the folding plate 9 by welding or the like. In a state in which the sling plate 10b and the reinforcing plate 10c are connected to each other by welding or the like, as shown in Fig. 5, by welding and snail The lock or the like is mounted and fixed between the support plates 10a and 10a. The outer end (the one end on the side of the side wall 3) of the suspended plate 10b is in a state of being aligned with the outer ends of the support plates 10a and 10a, and is fixed between the support plates 10a and 10a by the hanging plate 10b. In the suspended panel 10b, on the opposite side of the folding plate 9, that is, toward the side wall 3 side of the outer groove, an opening notch 10d is formed. The notch 10d is a suspended point that is connected to a lifting device to be described later. The suspended panel 10b having the notch 10d is a hanging portion in the present invention.

The spacers 11 are provided so as to protrude outward from the outer circumferential surface of the folding plate 9 as shown in Figs. 4 and 5 . As shown in Fig. 6, the spacers 11 are disposed along the circumferential direction of the folding plate 9 between the folded support members 10 which are disposed at equal intervals, that is, the suspended portions of the hanging portions. Between 10b and 10b. The gap maintaining member 11 is disposed at a substantially central portion between the adjacent folding supports 10 and 10, whereby the spacing maintaining members 11 are also provided at equal intervals along the circumferential direction of the folding plate 9. Accordingly, the spacers 11 and the folding support 10 are alternately arranged at equal intervals along the circumferential direction of the folding plate 9.

The spacers 11 are attached to a pair of steel plates (not shown) of the folding plate 9 in the same manner as the support plates 10a, for example, as shown in Figs. 4 and 5; and the H steel 11a held between the steel plates; It is formed by the steel plate 11b attached to the outer end surface of the H steel 11a. In the present embodiment, as shown by the solid line and the broken line in FIGS. 4 and 5, the spacing maintaining member 11 is the distance from the center of the folding plate 9 to the outer end of the spacing maintaining member 11, and the center of the folding plate 9 is The distance between the outer ends of the suspended panels 10b of the suspended portion is set to be the same length.

That is, the suspended panel 10b forming the suspended portion is disposed such that the outer end of the suspended panel 10b is located on a substantially circumferential (same circumference) of a circle formed concentrically with the folding plate 9. Further, the gap maintaining member 11 is disposed such that the outer end of the gap maintaining member 11 is located on a substantially circumferential circumference (on the same circumference) of the circle formed by the outer end of the hanging plate 10b. As a result, as will be described later, when the folding plate 9 is lifted by the lifting device, even if the folding plate 9 is largely displaced in the horizontal direction due to the influence of an earthquake or the like, it is not only the folding support member 10 of the suspended portion. (The suspended plate 10b), the gap maintaining member 11 also collides with the folding support 10 to the groove wall 3 of the outer groove, so that the burden at the time of collision can be dispersed.

Further, as shown by the two-point chain line in FIGS. 4 and 5, the outer end of the gap maintaining member 11 may be located further outward than the outer end of the hanging plate 10b (the side of the side wall 3 of the outer groove). Form the configuration. In other words, the distance between the center of the folded plate 9 and the outer end of the gap maintaining member 11 may be set to be longer than the distance from the center of the connecting plate 9 to the outer end of the hanging plate 10b. At this time, since the gap between the side wall 3 of the outer groove and the folding plate 9 can be reduced by the gap maintaining member 11, the folding plate 9 is lifted even when the folding plate 9 is lifted by the lifting device The displacement in the horizontal direction due to the influence of an earthquake or the like can also reduce the displacement amount and alleviate the impact when the gap maintaining member 11 collides with the side wall 3 of the outer groove.

Next, as shown in Fig. 7, an inner groove roof block is mounted on the roof gantry 8, and an inner tank roof (slot roof portion) 14 is assembled.

In addition, a high-level work vehicle (not shown) is driven into the base plate 1. In addition, in order to form the annular portion 16 in the annular region X below the footrest 6, it will be attached. Part of the foot platform 6 is constructed.

Further, the side walls 3 of the outer tank are also sequentially stacked on the upper side, and as shown in Fig. 7, the side wall 3 of the outer tank is applied to the ninth layer (#9) which becomes the final layer. Moreover, at this point, the overhanging eagle 5 for forming the side wall 3 remains, for example, from the sixth layer while being assembled in the seventh layer or more.

Next, as shown in Fig. 8, the scaffolding plate 9 is assembled from the inner peripheral surface of the side wall 3 of the outer tub, and the scaffold for the lifting device is assembled at a height that does not interfere with the suspended scaffold 5. 17. The hoisting device 17 is formed in a ring shape along the circumferential direction of the folded-back plate 9 formed in an annular shape by the eagle frame 17, thereby preventing the folding plate 9 from falling in the radial direction. In addition, when the scaffolding support 10 is used to support the rig 1 of the hoisting device, the slanting prevention material (not shown) is placed on the hoist for the hoisting device. The frame 17 is interposed between the folding plate 9 or the inner groove roof 14. Thereby, the eagle frame 17 for the lifting device fixed to the folding plate 9 or the inner groove roof 14 is formed. In the present embodiment, as shown in Fig. 8, the gantry 17 for the lifting device is assembled at a position corresponding to the fourth layer (#4) to the fifth layer (#5) of the side wall 3 of the outer tub.

In the present embodiment, the eagle frame 17 is attached to the fifth layer (#5) by the eagle frame 17 at the predetermined position of the side wall 3, and a plurality of hanger stations 18 are provided at equal intervals in the circumferential direction of the side wall 3. Hanger section). Specifically, the hanger table 18 is firmly and detachably attached to, for example, an anchor plate that is previously embedded in the side wall 3, so as to be provided to protrude slightly horizontally from the side wall 3 toward the inside thereof.

Next, a lifting device 19 is attached between the hanger table 18 and the suspended panel 10b of the folding support 10, respectively. Lifting device 19 is like the ninth The figure shows a hollow jack having: a jack body 20a coupled to the hanger table 18; the upper end is mounted to the jack body 20a, and the lower end is attached to the lifting bar of the suspended plate 10b of the folding support 10 20; and a bolt 19a for attaching the lower end portion of the lifting rod 20 to the suspended plate 10b. Further, in Fig. 9, the illustration of the gantry 17 for the lifting device is omitted for easy viewing.

When the lifting device 19 is attached, first, the jack body 20a is coupled to the hanger table 18 in a fixed state, the lifting bar 20 is suspended, and the lower end portion of the lifting bar 20 is inserted into the folding support 10 to be suspended. Inside the notch 10d of the plate 10b. Then, the lower end portion of the mast 20 is fixed to the to-be-engaged plate 10b by the bolt 19a prepared in advance.

A plurality of lifting devices 19 are disposed at predetermined intervals in the circumferential direction of the side wall 3 of the outer tank, and the lifting device 19 is respectively attached to the suspended plate 10b of the corresponding folding support 10, as shown in FIG. , remove the roof gantry 8. Thereby, the weight of the groove constituent member is maintained by a plurality of lifting devices 19.

Here, as shown in FIG. 8, the hanger table 18 is disposed at a position corresponding to the fifth layer (#5) of the side wall 3, and the folding support 10 is attached to the third layer (#3) of the corresponding side wall 3. position. The mast 20 is formed to a sufficient length corresponding to the length between the hanger table 18 and the folding support 10. However, as will be described later, when the lifting device 19 is driven to raise the mast 20, the mast 20 interferes with the overhanging eagle 5 located directly above it.

In order to solve this problem, the mast 20 is detachably coupled to the plurality of rods 20b in the longitudinal direction by a screw lock or the like as shown in FIG. By means of formation.

Thereby, when the lifting bar 20 is raised, the lifting bar 20 can be prevented from interfering with the overhanging eagle 5 by separating the rod 20b protruding above the hanger table 18 from the lower rod 20b. Further, reference numeral 21 in Fig. 8 is a conventional hanging balance for lifting and descending the respective constituent members of the lifting device 19, and the lever 20b is lowered, and has a balance bar 21a and The weight 21b provided at the end of one of the balance bars 21a. The suspension balance 21 is suspended by a crane (not shown), thereby controlling the respective movements of the lifting and the horizontal movement.

Further, in such a project, the cold preservation project of the annular portion 16 and the cold preservation project at the center portion are performed in parallel on the base plate 1. In the cold preservation process of the annular portion 16, as shown in Fig. 9, under the footrest gantry 6, above the bottom cold heat and vibration absorbing material 22, perlite concrete 23a, 23b, lightweight concrete for structure 24 are assembled, and An annular plate 16a is mounted thereon. The annular portion 16 ultimately supports the assembled inner groove side panel 7. Accordingly, the annular plate 16a of the annular portion 16 is formed thickly, and the cooling structure is also formed of a hard material such as a concrete block.

Next, as shown in Fig. 10, the folding plate 9 is lifted by the lifting device 19, whereby the inner panel 14 including the inner side groove 14, the inner groove side plate 7, and the folded support member 10 are supported. The gap maintaining member 11 and the groove forming member Y of the gantry 17 of the lifting device are raised. Specifically, the jack body 20a is driven to rotate forward, the jack 20 is raised, and the groove forming member Y in the middle of assembly is lifted together with the folding support 10.

Here, the folding plate 9 hoisted by the lifting device 19 is for connecting the inner groove roof 14 and the inner groove side plate 7, and the plate thickness is compared with the inner groove side plate 7 Fully thick and strong. Accordingly, even if the inner groove side plate 7 and the inner groove roof 14 are additionally included, the weight of the gantry 17 for the lifting device is further included, and the buckling is not performed. Therefore, the inner groove side plate 7 on the lower layer side is formed to withstand a large hydraulic pressure of the solution after the completion of the groove, and the plate thickness is formed thickly, and the inner groove side plate 7 of the upper layer side (especially the uppermost layer) can withstand The smaller hydraulic pressure of the inner solution can be formed, and the thickness of the plate is formed thin. In the present embodiment, since the inner groove side plate 7 is not bent, the inner groove side plate 7 can be formed into the above-described optimum design, and the weight can be reduced and the cost can be reduced.

After the groove forming member Y is raised by about one layer of the inner groove side plate 7 by the lifting device 19, the space formed below the inner groove side plate is carried into the inner groove side plate 7 of the next layer, and the loading of the inner groove side plate 7 is set. This is carried out at the construction port 4 of the side wall 3. A first conveying device (not shown) is provided around the construction port 4, and the inner groove side plate 7 is sequentially conveyed from the outside of the side wall 3 through the construction port 4 to the footrest frame 6 by the first conveying device. Further, a second conveying device (not shown) is provided on the foot stand 6 along the circumferential direction of the side wall 3. The second conveying device has a rail (not shown) or the like along the circumferential direction of the side wall 3, and is conveyed to the inner groove side plate 7 on the footrest 6 and sequentially conveyed along the circumferential direction of the side wall 3.

Next, the inner groove side plate 7 that has been transported by the second conveying device is erected on the foot stand 6, and is disposed in an annular shape below the raised inner side plate 7. Then, as shown in Fig. 11, the inner groove side plates 7 adjacent in the lateral direction are integrally welded, and the inner groove side plates 7 arranged up and down are integrally welded to each other, whereby the inner groove side plates 7 are formed into an integral cylindrical shape. That is, the eighth layer is installed under the inner groove side plate 7 which becomes the ninth layer (#9) of the uppermost layer. (#8) The inner groove side plate 7.

Further, a plurality of the inner groove side plates 7 may be laterally connected to each other in advance of the outer side wall 3 of the outer groove, and fed into the side wall 3 to form a ring shape, and then the inner groove side plates 7 arranged up and down are welded to each other. In this manner, the lateral direction of the plurality of inner-groove side plates 7 is connected to the outside of the side wall 3 having a small restriction on the working space, whereby the welding work can be easily performed, and the inner grooves can be efficiently assembled.

When lifted in this manner, as shown in Fig. 11, the upper end of the lifting bar 20 of the lifting device 19 protrudes upward from the hanger base 18. If the lifting bar 20 rises above it, it will interfere with the overhanging eagle 5 located directly above it. On the other hand, during the welding of the inner-groove side plates 7 and the like, among the plurality of rods 20b constituting the mast 20, the rods 20b projecting upward from the hanger table 18 are removed. The detached rod 20b is lowered onto the inner tank roof 14 by a hanger (not shown) previously provided on the top of the gantry 17 for the hoisting device. The removal of the rod 20b is performed by the scaffold 17 using a lifting device. Further, in order to prevent the hoisting device 17 from interfering with the overhanging eagle frame 5, the hoisting device 21 sequentially removes the hoisting device 17 from the upper side of the eagle frame 17.

Then, the lifting device 19 raises the groove forming member Y by about one layer of the inner groove side plate 7, and the space formed below the inner groove side plate 7 carries the inner groove side plate 7 of the other layer. Similarly to the mounting of the inner groove side plate 7 of the eighth layer (#8), as shown in Fig. 12, the inner groove side plate 7 of the seventh layer (#7) is attached. At this time, the rod 20b protruding upward from the hanger table 18 is also removed, and the suspension balance 21 is lowered onto the inner tank roof 14.

Install the ninth layer (# 9) to the seventh layer (# 7) in this way After the groove side plate 7, as shown in Fig. 13, the overhanging eagle 5 on the inner peripheral surface side of the side wall 3 is removed. Usually, during the installation of the inner groove side plates 7 of the ninth layer (#9) to the seventh layer (#7), the side walls 3 of the outer grooves are completed to the ninth layer (#9) which is the uppermost layer. According to this, the template or the like for forming the side wall 3 can be removed, and thus the overhanging eagle 5 located on the inner peripheral side of the side wall 3 can be removed. Further, the scaffold or the like on the outer peripheral surface side of the side wall 3 is required to be used for the subsequent work, and therefore it is retained without being removed.

Next, in order to perform displacement resetting of the lifting device 19, as shown in Fig. 13, a second hanger table 25 is provided at the top of the side wall 3 of the outer tub. Further, the groove constituent member Y (including the eighth groove, the inner groove side plate 7 of the seventh layer, and the like) is temporarily lowered and lowered on the foot stand 6.

Next, as shown in Fig. 9, the lifting bar 20 of the lifting device 19 is temporarily removed from the suspended plate 10b of the folding support 10 by means of a suspension balance 21, a crane or the like. Further, the jack body 20a of the lifting device 19 is detached from the hanger table 18. Thereby, the lifting device 19 is removed from between the side wall 3 of the outer tank and the folding plate 9. Furthermore, the hanger table 18 is removed from the side wall 3.

Then, the jack body 20a of the lifting device 19 is attached to the second hanger table 25 shown in Fig. 13. Further, in the prior art, the upper side of the mast 20 was temporarily removed in order not to interfere with the overhanging eagle 5, and the sag was placed on the inner trough roof 14. However, the hoisting rod 20 can be freely extended by removing the overhanging eagle 5 on the inner peripheral surface side of the side wall 3, and therefore, the rod 20b on which the sag is placed on the inner tank roof 14 is attached to the lifting rod 20 again. Increase the lifting rod 20. In the present embodiment, as shown in Fig. 13, in order to cause the lifting bar 20 to descend from the ninth layer (#9) which is the uppermost layer of the side wall 3 which becomes the outer groove Up to the fifth layer (#5), it is thus additionally supplemented with a separately prepared preliminary rod 20b to adjust the lifting rod 20 to a predetermined length.

In this manner, after the lifting bar 20 is adjusted to a predetermined length, the lower end side of the lifting bar 20 is again inserted into the notch 10d of the hanging plate 10b of the folding support 10. Then, the lower end portion of the mast 20 is fixed to the to-be-engaged plate 10b by the bolt 19a. Thereby, the lifting device 19 is displaced. After the shift reset of the lifting device 19 is completed in this manner, as shown in Fig. 13, the crane 17 for the lifting device is removed.

Next, as shown in Fig. 14, the folding plate 9 is lifted by the lifting device 19, and the groove constituent member Y is raised by about one layer of the inner groove side plate 7.

Then, the space formed below the inner groove side plate 7 is carried into the inner groove side plate 7 of the other layer, and is similarly attached to the inner groove side plate 7 of the eighth layer (#8) and the seventh layer (#7). As shown in Fig. 15, the inner groove side plate 7 of the sixth layer (#6) is installed.

Next, an outer trough roof 26 is installed over the inner trough roof 14. The attachment of the outer tank roof 26 is performed by attaching a plurality of joints (not shown) formed of a plurality of duct steels to the inner tank roof 14, and attaching the outer tank roof 26 to the joints.

Moreover, the operation of attaching a side lining (not shown) to the inner peripheral surface of the side wall 3 of the outer tank is started.

In the following, the rise of the groove constituent member Y by the lifting device 19, the loading of the inner groove side plate 7 of the next layer below the inner groove side plate 7 (the groove forming member Y), and the insertion of the inner groove side plate are sequentially performed. 7 The installation of the groove constituting member Y (the inner groove side plate 7), as shown in Fig. 16, will The inner groove side plate 7 is attached to the first layer (#1) of the lowermost layer. Thereby the side walls of the inner tank are completed.

Moreover, when the inner-groove side plate 7 of each layer is attached, that is, the groove-constituting member Y is lifted, the space below the space is formed, and the inner-groove side plate 7 is carried in, and the various materials 27 are carried into the side wall. 3 on the base board 1 inside. In addition, an operating scaffolding 28 is assembled on the outer trough roof 26.

Next, as shown in Fig. 17, the foot stand 6 is removed, and the lower portion of the groove forming member Y becomes a space. Then, the groove constituting member Y is lowered by the lifting device 19, and the outer peripheral end of the roof bone 12 of the outer tank roof 26 is joined and fixed to the mounting end of the top inner peripheral surface of the side wall 3 of the outer tank.

Next, the connecting material (not shown) connecting the outer tank roof 26 and the inner tank roof 14 is removed, and the connection therebetween is released.

Next, as shown in Fig. 18, the groove constituting member Y is lowered again by the lifting device 19, and the lower end portion of the lowermost layer of the inner groove side plate 7 is lowered to the annular portion 16. Then, the lower end portion of the lowermost layer of the inner groove side plate 7 is attached to the inner groove anchor 2 provided in the base plate 1.

Next, the folding support 10 is removed from the folding plate 9, and the gap maintaining member 11 is removed as necessary.

Thereafter, the tensioning of the side wall 3 of the outer tank is performed. Further, a urethane foam (PUF) of a cold heat-resistance-reducing material is sprayed on a side lining (not shown) attached to the inner peripheral surface of the side wall 3 of the outer tub. Furthermore, the lifting device 19, the second hanger table 25, and the like are removed. Then, the construction port 4 is closed, a pump cylinder (not shown) is installed and water is poured, and a pressure resistance and airtightness test are performed. Finally, a cold-retaining material (not shown) such as perlite is filled between the inner tank and the outer tank, and the outer tank is kept cold. After the coating work and the piping cold preservation project, the cylindrical tank 100 is completed.

When the cylindrical groove 100 having the above-described configuration is constructed, particularly between the lifting of the groove forming member Y by the lifting device 19 or between the suspensions, if an earthquake or strong wind occurs, there is an inner groove roof. 14. The possibility that the outer trough roof 26 and the like are largely displaced in the horizontal direction in the outer tank. However, in the present embodiment, as shown in Figs. 4 to 6, the gap maintaining member 11 is provided on the outer peripheral surface of the folding plate 9. Thereby, even if the folding plate 9 (the groove forming member Y) is displaced in the horizontal direction, the gap maintaining member 11 also collides with the side wall 3 of the outer groove because the folding support member 10 (the hanging plate 10b) is not the hanging portion. Therefore, the burden at the time of collision can be dispersed.

According to this, according to the construction method of the cylindrical groove of the present embodiment, even when the lifting, the folding plate 9 (the groove forming member Y) is displaced in the horizontal direction due to the earthquake, the gap maintaining member 11 and the folding support are supported. The pieces 10 collide with the side wall 3 of the outer groove together, so that the burden at the time of collision can be dispersed. It is possible to prevent the destruction of the side wall 3 of the groove due to the concentration of the load.

Further, the gap maintaining members 11 are disposed between the adjacent folding supports 10 and 10, respectively. That is, the folding support 10 is located between the adjacent gap maintaining members 11, 11. Accordingly, the folding plate 9 (the groove forming member Y) is displaced in the horizontal direction, and when the side wall 3 is collided, the adjacent supporting members 10, 11 can be used to protect the folding support 10 between them The lifting device 19 is damaged between the suspended plate 10b and the suspended portion 10b.

In addition, the center of the folded portion 9 to the gap maintaining member 11 The gap support member 11 is disposed such that the distance of the outer end is greater than the length of the center of the folded portion 9 to the outer end of the hanging plate 10b (the folded support 10). Thereby, the collision maintaining member 11 necessarily hits the side wall 3 at the time of collision with the side wall 3, so that damage between the lifting device 19 and the suspended plate 10b (the suspended portion) can be surely prevented.

Further, the outer ends of the plurality of suspended plates 10b (the folded support members 10) are disposed on the same circumference, and the outer ends of the gap maintaining members 11 are disposed on the same circumference as the circumference formed by the outer ends of the suspended plates 10b. on. Thereby, the collision between the adjacent gap maintaining member 11 and the folding support 10 collides with the side wall 3 at the same time as the collision with the side wall 3, so that the burden dispersion effect at the time of collision can be improved.

Further, the distance between the center of the folded portion 9 and the outer end of the gap maintaining member 11 is set to be larger than the length of the center of the folded portion 9 to the outer end of the hanging plate 10b (the folded support 10). In the case of the member 11, the substantial spacing between the side wall 3 of the outer groove and the folding plate 9 can be reduced by the gap maintaining member 11. According to this, even if the folding plate 9 is displaced in the horizontal direction due to the influence of an earthquake or the like, the displacement amount of the folding plate 9 can be reduced. Thereby, the impact when the gap maintaining member 11 collides with the side wall 3 of the outer tub can be alleviated, and the damage of the side wall 3 of the outer tub can be prevented. Further, it is possible to surely prevent damage between the lifting device 19 and the suspended plate 10b (the suspended portion).

Further, in the process of assembling the folding plate 9, the folding plate 9 is attached to the upper side of the pre-assembled inner groove side plate 7. When the connecting plate 9 which is bent in the height direction is initially assembled into an annular shape, the inner groove side plate 7 which is not bent in the height direction can be easily assembled into an annular shape, and thereafter The folding plate 9 is attached to the inner groove side plate 7. Accordingly, the assembly of the flaps 9 can be facilitated.

Further, in the process of attaching the inner groove side plate 7 to the lower side of the connecting plate 9 to assemble the inner groove of the metal, the lifting device 19 is suspended from the hanger table 18, and the processing of the groove forming member Y is lifted; A second hanger table 25 is disposed above the hanger table 18 and the lifting device 19 is displaced, and the process of lifting the groove forming member Y is performed in this state. In any of the processes, by providing the gap maintaining member 11, damage to the roof side or the outer groove of the inner groove can be prevented.

The preferred embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the foregoing embodiments. The shapes, combinations, and the like of the respective constituent members shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the foregoing embodiment, after the present invention is applied to the side wall 3 of the outer tank to be formed on the way, the inner tank side panel 7 is lifted by the lifting device 19 via the folding plate 9, and the second layer is sequentially installed on the lower side thereof. The inner groove side plate 7 is constructed by a cylindrical groove forming an inner groove. However, the present invention can also be applied to a method of constructing a cylindrical groove having the following engineering.

That is, the present invention is also applicable to a method of constructing a cylindrical groove having the following structure, in which the side wall of the outer groove is sequentially assembled from the lowermost layer to the uppermost layer on the bottom of the outer groove, in the outer groove Above the bottom and between the inner groove and the outer groove, the gantry is arranged on the side wall of the outer groove to support the work of the lifting device; and the inner groove roof and the outer groove roof are integrally assembled on the bottom of the outer groove, from the top The inner groove side plates are sequentially attached to the inner groove roof to the lowermost layer, and the installed inner groove side plates are sequentially raised by the lifting device. engineering.

Further, the number of the gap maintaining members 11 and the arrangement of the folding support members 10 may be any. For example, two or more gap maintaining members 11 may be disposed between the adjacent folding supports 10 and 10.

[Industrial availability]

According to the present invention, it is possible to provide a method of constructing a cylindrical groove which can prevent damage to the roof side and the outer groove of the inner groove even when the roof side of the inner tank is lifted while being horizontally displaced.

3‧‧‧Side wall of the outer trough (PC wall)

7‧‧‧Inch side panel

9‧‧‧Folding board (folding department)

10‧‧‧Folding support

10a‧‧‧Support board

10b‧‧‧ hanging board (hanging part)

10c‧‧‧ reinforcing plate

11‧‧‧ gap maintenance parts

11a‧‧‧H steel

11b‧‧‧ steel plate

Claims (6)

A method for constructing a cylindrical groove is to construct a cylindrical groove having a metal inner groove and a concrete outer groove, and includes: a project of assembling an annular fold portion on the inner side of the outer groove; a plurality of lifting portions of the plurality of lifting devices are disposed on the folding portion; and the plurality of gap maintaining members projecting outward from the outer circumferential surface of the folding portion are disposed along the circumferential direction of the outer circumferential surface And a plurality of hanger portions for suspending the plurality of lifting devices are disposed on the side wall of the outer groove; and the plurality of lifting devices are respectively mounted on the plurality of hanging sides of the outer wall of the outer groove a work between the frame portion and the plurality of suspended portions of the folding portion; the folding portion is lifted by the plurality of lifting devices to rise, and is mounted on the lower side of the raised portion after the lifting The inner groove side plate is used to assemble the aforementioned inner groove. The method of constructing a cylindrical groove according to claim 1, wherein the plurality of gap holders are disposed between the plurality of suspended portions. The method for constructing a cylindrical groove according to the first or second aspect of the invention, wherein a distance from a center of the folding portion to an outer end of the gap maintaining member is larger than a center of the folding portion to the hoisted The plurality of gap holders are disposed in such a manner as to have a length of the outer end of the portion. The method for constructing a cylindrical groove according to claim 1 or 2, wherein the outer end of the plurality of suspended portions and the outer end of the plurality of gap maintaining members are disposed on the same circumference The plurality of suspended portions and the plurality of gap maintaining members. The method for constructing a cylindrical groove according to any one of claims 1 to 4, wherein the folding portion is attached to a pre-assembled annular shape in the process of assembling the folding portion. The upper side of the inner groove side plate is configured to assemble the folding portion, and in the process of assembling the inner groove, the inner groove side plate of the next layer is attached to the lower side of the folding portion which is raised by the plurality of lifting devices The inner groove side plate. The method for constructing a cylindrical groove according to any one of claims 1 to 5, wherein the engineering of assembling the inner groove has a process of installing an inner groove side plate on a lower side of the folding portion And a process of installing a plurality of inner groove side plates under the one inner groove side plate, and a plurality of second hanger portions are disposed above the plurality of hanger portions of the side wall of the outer groove, respectively The plurality of lifting devices are displaced between the plurality of second hanger portions and the plurality of suspended portions, and the folding portion is lifted upward by the plurality of lifting devices to raise the lifting device.