TWI598493B - Synchronization method for jack-up system and construction method for cylindrical tank - Google Patents

Description

Synchronization method of lifting system and construction method of cylindrical groove

The invention relates to a synchronization method of a lifting system and a method for constructing a cylindrical groove.

The present application claims priority from Japanese Patent Application No. 2014-234540, filed on Jan.

A cylindrical tank having a double-shell structure of an inner tank and an outer tank is used for storage of a cryogenic liquid such as LNG (liquefied natural gas) or LPG (liquefied petroleum gas). Japanese Laid-Open Patent Publication No. 2012-149416 discloses a method of constructing a cylindrical groove having an inner groove made of metal and an outer groove made of concrete. In this construction method, in order to shorten the construction period of the cylindrical groove, a method of constructing the inner groove and the outer groove in parallel is employed.

Specifically, the side wall of the outer groove is sequentially assembled from the lowermost portion to the uppermost portion on the bottom of the groove other than the cylindrical groove, so that the lifting device is supported on the side wall of the outer groove, and is alternately repeated: The operation of the inner groove side plate by the lifting device and the welding of the next inner groove side plate to the lower side of the raised inner groove side plate, the inner groove side plates are sequentially from the top The section is installed to the lowermost section, thereby constructing the inner tank in parallel with the outer tank.

In the above-mentioned prior art, a plurality of jack up devices are used to lift a trough roof structure including an inner trough roof and an outer trough roof, and to integrate the inner trough side plates into a cylindrical shape. A substantially disc-shaped or cylindrical-type hoisting material such as a groove structure. The plurality of lifting devices are disposed at intervals around the hoisting object to perform synchronous control so that the height level of the lifting object can be adjusted in units of, for example, millimeters. By this synchronous control, the root gap of the inner groove side plate is ensured to perform the welding operation of the inner groove side plate. That is, in the present invention, the root gap which is the object to be secured is a gap required for welding between the inner groove side plates arranged one above the other.

However, since the above-mentioned hoist is a large and not a rigid body, unavoidable distortion occurs when hoisting. As a result, among the plurality of lifting devices, a part of the lifting device's hanging load (jack reaction force) may increase, and the other part of the lifting device may reduce the hanging load. When the hanging load of a part of the lifting device becomes too large, there is a possibility that the load applied to the supporting structure (the side wall of the outer groove or the like) supporting the lifting device exceeds the allowable value.

In terms of its solution, a method of setting an equalizer for adjusting the hanging load to each of the lifting devices can be considered. The equalizer has a hydraulic drum configuration that supports the body of the lifting device, which can be used to change the height level of the lifting device using the pascal principle and to bring the hanging load close to the design value. However, when the height level of the lifting device is changed, there is a case where an appropriate root gap of the inner groove plate cannot be ensured at this time.

The present invention has been developed in view of the above problems, and SUMMARY OF THE INVENTION It is an object to provide a method of synchronizing a lift jacking system and a method of constructing a cylindrical trough that ensures proper root clearance of the inner trough and homogenizes the hanging load of the plurality of lifts.

As a result of careful experimentation in order to solve the above problems, the present inventors have found that the equalizers of the lifting device of the specific combination are connected by the oil communication path, and the lifting load of the lifting device is equalized, so that the inner groove side plate can be highly satisfied. The present invention is contemplated by the requirements of both the root gap and the homogenization of the lifting load of the lifting device.

That is, in order to solve the above problems, the first aspect of the present invention is a method for synchronizing a lifting system for lifting a lifting object by a plurality of lifting devices, the synchronization method separating a plurality of lifting devices Arranged around the lifting object at intervals, a hydraulic equalizer for adjusting the hanging load is provided for each of the plurality of lifting devices, and the oil communication path is adjacent to the circumferential direction of the lifting object. Two equalizers of the lifting device are connected.

Further, a second aspect of the present invention is a method of constructing a cylindrical groove having a double-shell structure of an inner groove and an outer groove, the construction method having: a plurality of lifting devices disposed in the outer groove; a lifting step of lifting a lifting object including at least one of a groove roof structure and an inner channel structure; and performing the following operations before the lifting step: arranging the plurality of lifting devices at intervals Around the object, a hydraulic equalizer for adjusting the hanging load is provided in each of the plurality of lifting devices, and two lifting devices adjacent to each other in the circumferential direction of the lifting object are connected by an oil communication path. The equalizers are connected.

According to the present invention, an appropriate root gap of the inner groove side plates can be ensured, and the hanging load of the plurality of lifting devices can be made uniform.

1‧‧‧ Basic Edition

2‧‧‧PC wall

3‧‧‧Basic Department

4‧‧‧Internal groove anchor

5‧‧‧Set the step

6‧‧‧Bottom liner

7‧‧‧ Roof rack

8‧‧‧Works

9‧‧‧Inch slot side panel

10‧‧‧door frame

11‧‧‧ joint plate

12‧‧‧constituting components

13‧‧‧Rings

14‧‧‧Inch roof

15‧‧‧Internal and external trough rooms

16‧‧‧ hanging side jack stand

17‧‧‧ Joint plate reinforcement

18‧‧‧ Lifting device

19‧‧‧ Lifting pole

22‧‧‧ outer trough roof

23‧‧‧ Lifting stairs

24‧‧‧Roof stairs

25‧‧‧ pump tube

39‧‧‧Bottom anti-cold heat absorbing material

40‧‧‧foam glass

44‧‧‧ Keep cold materials

50‧‧‧Cylinder groove

51‧‧‧ lifting objects

52‧‧‧Slot roof structure

53‧‧‧Internal structure

100‧‧‧ Lifting system

101‧‧‧Equalizer

102‧‧‧ oil communication road

200‧‧‧ Lifting system

201‧‧‧Equalizer

202‧‧‧ oil communication road

X‧‧‧ring area

Fig. 1 is an explanatory view showing a first step of a method of constructing a cylindrical groove according to an embodiment of the present invention.

Fig. 2 is an explanatory view showing a second step of the method of constructing the cylindrical groove according to the embodiment of the present invention.

Fig. 3 is an explanatory view showing a third step of the method of constructing the cylindrical groove according to the embodiment of the present invention.

Fig. 4 is an explanatory view showing a fourth step of the method of constructing the cylindrical groove according to the embodiment of the present invention.

Fig. 5 is an explanatory view showing a fifth step of the method of constructing the cylindrical groove according to the embodiment of the present invention.

Fig. 6 is a plan view showing the lift system of the embodiment of the present invention.

Fig. 7 is a plan view showing a lift system as a comparative example.

Figure 8 is a graph showing the relationship between the root clearance of the inner slot plate and the hanging load of the lifting device due to the difference in the synchronization method of the lifting system.

Hereinafter, a method of constructing a cylindrical groove of the present invention will be described with reference to the drawings. In the following description, a cylindrical tank is used to exemplify a PC (prestressed concrete) double-shell storage tank in which LNG is stored.

As shown in Fig. 1, in this method, first, a substantially plate-shaped basic plate 1 (bottom of the outer groove) is performed. A base portion 3 for assembling the PC wall 2 (outer groove) is provided on the outer peripheral edge portion of the base plate 1. Further, a plurality of anchor straps 4 are provided along the inner side of the base portion 3. Further, the PC wall 2 is poured on the base plate 3. When the PC wall 2 is poured, the step 5 is set, and a plate mold (not shown) is provided.

Next, the bottom liner 6 is laid on the base plate 1. Further, the roof stand 7 is assembled at the center of the base plate 1. Further, a work opening 8 for inserting the inner groove side plates 9 into the grooves in the construction one by one is formed at the base end portion of the PC wall 2. Further, a plurality of gantry stages 10 for assembling the inner groove side plates are provided along the inner side of the base end portion of the PC wall 2. The gantry 10 is provided so as to straddle the annular region X, which belongs to a region in which a cylindrical inner groove formed by combining a plurality of inner groove side plates 9 is finally unloaded on the base plate 1.

Then, in the present method, the inner groove side plate 9 is placed on the gantry stage 10, and the inner groove side plates 9 adjacent to each other in the circumferential direction of the PC wall 2 are welded, and the whole is formed into a cylindrical shape toward the circumference. The directions are joined (hereinafter, there is a case called the inner groove structure 53). Further, a knuckle plate 11 is fitted to the upper end portion of the inner groove side plate 9. Further, the structural member 12 of the perforated concrete block or the annular portion 13 (see FIG. 2) such as a lightweight concrete block is temporarily placed in the annular region X below the portal frame 10. Further, the inner tank roof 14 (slot roof structure 52) is assembled to the roof rack 7. Further, the inner groove side plate 9 is attached to the outer peripheral edge portion of the inner groove roof 14 through the joint plate 11.

The cold preservation of the annular portion 13 is performed below the portal frame 10. The cold preservation of the annular portion 13 is carried out by assembling a perlite concrete block or a lightweight concrete block to a bottom heat-resistant tempering material and mounting an annular plate thereon.

The annular plate 13 is a portion that finally supports the inner groove side plate 9 after assembly, and the annular plate is formed to be thick, and the cold insulation structure is also formed of a hard member such as a concrete block.

After the cold preservation work of the annular portion 13 is completed, the leg portion of the gantry stage 10 disposed closer to the inner side of the groove than the annular portion 13 is disposed (see FIG. 2) to the annular portion 13. With such a migration arrangement, since there is no interference object closer to the inner side of the groove than the annular portion 13, the cold preservation work of the central portion on the base plate 1 can be performed. As shown in Fig. 3, in the cold preservation project at the center portion, the foam glass 40 is placed on the bottom anti-cold heat absorbing material 39. Then, perforated concrete (not shown) and the inner tank bottom plate (not shown) are sequentially superposed on each other.

Returning to Fig. 1, in the present method, in parallel with the above-described cold preservation project, a plurality of lifting devices 18 are disposed on the PC wall 2 in the circumferential direction of the groove. First, in the inner and outer groove portions 15 (between the PC wall 2 and the inner groove side plate 9) above the base plate 1, a part of the PC wall 2 at a position higher than the joint plate 11 is disposed in the groove direction. A plurality of hanging side jacks 16 (hanging points). The hanging side jack stand 16 is substantially horizontally protruded from a part of the PC wall 2 of a predetermined height toward the inside of the groove. The hanging side jack stand 16 is connected and fixed to an anchor plate or the like embedded in the PC wall 2 in a stable and detachable manner.

Further, a plurality of joint plate reinforcing members 17 corresponding to the plurality of lifting devices 18 are provided in the joint plate 11. The joint plate reinforcing material 17 protrudes from the joint plate 11 toward the inner and outer groove portions 15. Further, the joint plate reinforcing member 17 is a member of the gantry that is suspended. The lifting device 18 is a center hole jack, and the lower end portion of the lift lever 19 is attached to the joint plate reinforcing member 17. Further, the equalizer 101 supporting the apparatus body of the lifting device 18 is disposed in the lifting device 18.

As described above, after the lift system 100 including the plurality of lift devices 18 is provided, as shown in FIG. 2, the roof rack 7 is removed, and the joint plate 11 is lifted by the plurality of lift devices 18. Thereby, the hoisting object 51 including the inner side groove plate 9 and the inner side roof 14 is raised. After the lift device 18 is raised up to one stroke of the lift lever 19 (in the present embodiment, it corresponds to the vertical width of one inner groove plate 9), the next inner groove plate 9 is carried in and borrowed. The space formed by the lower portion of the inner groove plate 9 is lifted by it.

The next inner groove plate 9 is conveyed to a predetermined welding position, and a plurality of inner groove plates 9 arranged in a ring shape are welded to the door frame 10, and the inner groove plates 9 arranged up and down are welded, thereby the inner groove The plate 9 is formed in an integral cylindrical shape. In this manner, the inner tank side plate 9 is raised by the lifting device 18 and the lower inner groove side plate 9 is attached to the lower side of the raised inner groove side plate 9 alternately.

Next, as shown in Fig. 3, the outer tank roof 22 (slot roof structure 52) is assembled on the inner tank roof 14. The outer tank roof 22 is coupled to the inner tank roof 14 by a connecting material (not shown), and is integrally assembled with the inner tank roof 14. In addition, after the PC wall 2 is assembled, the lifting device 18 will be Move the settings to the top and change the hanging point. Then, on the portal frame 10, the inner groove side plate 9 is raised by the lifting device 18, and the lower inner groove side plate 9 is attached to the lower side of the raised inner groove side plate 9 in an interactive manner. The groove side plates 9 are sequentially mounted from the uppermost stage to the lowermost stage.

Next, as shown in FIG. 4, after the attachment to the lowermost stage of the inner groove plate 9, the gantry stage 10 is removed, and the lower end portion of the lowermost stage of the inner groove plate 9 is unloaded on the annular portion 13, and The groove anchor 4 disposed in the base plate 1 is attached to the lowermost portion of the inner groove plate 9. Thereby, the inner tank 30 is completed.

Further, the outer tank roof 22 which is raised together with the inner tank roof 14 is attached to the upper end portion of the PC wall 2 which has been assembled to the uppermost stage, and the connection to the inner tank roof 14 by the connecting member (not shown) is released. . Further, the side liner 2a is attached to the inner wall surface of the PC wall 2. Further, an elevating staircase 23 is provided outside the PC wall 2. Further, a roof staircase 24 is provided on the outer tank roof 22. Further, a pump barrel 25 is carried into the tank.

Then, as shown in Fig. 5, the joint plate reinforcing material 17 is removed and the lifting device 18 is removed. Then, the fastening work of the PC wall 2 is performed. Then, after the closing of the work opening 8 and the installation of the pump tube 25, water is filled in the inner tank and a pressure/airtight test is performed.

Finally, the heat retaining material 44 is disposed in the inner and outer tanks 15, and the cold storage material 44 is placed on the back side (upper surface side) of the inner tank roof 14 to perform cold preservation work, and then the cylindrical type is constructed by coating engineering and piping cooling engineering. Slot 50.

Next, with reference to FIGS. 6 to 8, the synchronization side of the lift system 100 used in the above-described construction method of the cylindrical groove 50 will be described. The law is explained.

As described above, the present method has a lifting step of lifting at least one of the groove roof structure 52 and the inner groove structure 53 by the plurality of lifting devices 18 disposed on the PC wall 2. Heavy object 51 (refer to Figs. 1 to 4). In the present method, before the lifting step, the lifting system 100 shown in Fig. 6 for synchronizing the hanging loads of the plurality of lifting devices 18 is formed. Further, the hoisting object 51 may be only one of the trough roof structure 52 and the inner tank structure 53.

First, as shown in Fig. 6, a plurality of lifting devices 18 are disposed around the lifting object 51 with a space therebetween. In the lift system 100 of the present embodiment, 30 (#1 to #30) lifting devices 18 are used, and the lifting devices 18 are placed on the PC wall 2 at equal intervals. Further, the "circumferential direction" of the hoisting object 51 is a direction that surrounds the vertical axis passing through the center of the hoisting object 51.

Further, a hydraulic type equalizer 101 for adjusting the hanging load is provided in each of the lifting devices 18. The equalizer 101 is provided with an oil drum to adjust the height level of the apparatus body of the lifting device 18 and the hanging load.

Next, the two lifting devices 18 adjacent to each other in the circumferential direction of the lifting object 51 are grouped, and the two equalizers 101 of the group are connected to each other by the oil communication path 102. For example, two equalizers 101 of the two lifting devices 18 provided at #2 and #3 are connected by the oil communication path 102, and two of the #4 and #5 are connected by the other oil communication path 102. The two equalizers 101 of the lifting device 18 are connected. In the present embodiment, the number of sets of the lifting device 18 is 15 and two of the groups are connected by the oil communication path 102. The equalizer 101 performs equalization of 15 groups. Further, in the present embodiment, only the two equalizers 101 of the two lifting devices 18 adjacent to each other in the circumferential direction are connected to each other by the oil communication path 102, and the two equalizers 101 are not connected to each other. Equalizer 101.

In one of the groups of the lifting devices 18 connected by the oil communication path 102, when the lifting load of the lifting device 18 is increased, for example, when the lifting device 18 is pushed down, the lifting device 18 is supported. The oil in the equalizer 101 is moved to the other equalizer 101 via the oil communication path 102, and the other lifting device 18 is pushed up by the Pascal principle. Since the lifter 18 of the other push-up is intended to pull the lifter 51 upward, the hanging load of the other lifter 18 is increased. By the fact that the hanging load of one of the lifting devices 18 is reduced and the hanging load of the other lifting device 18 is increased, the hanging load is balanced.

Next, the effect of the lift system 100 will be more apparent by comparison between the present embodiment and the comparative example shown in FIG.

In the lift system 200 of the comparative example shown in Fig. 7, the five lifting devices 18 selected every other one in the circumferential direction are set as one group, and the five equalizers of this group are connected by the oil communication path 202. 201 is all connected. Further, two of the five lifting devices 18 included in one group are overlapped with the adjacent groups in the left and right directions in the circumferential direction. For example, the lifting devices 18 of #4 and #6 are overlapped (interactively arranged) with the lifting devices 18 of #3 and #5 of the adjacent group.

Figure 8 shows the root gap of the inner slot plate and the lifting device 18 due to the different synchronization methods of the lifting systems 100,200. A graph of the relationship of the hanging load.

Further, in Fig. 8, the "5 equalizer" indicates the lift system 200 shown in Fig. 7, and the "2 equalizer" indicates the lift system 100 shown in Fig. 6. In addition, the "root gap measurement value" indicates the measurement value of the root gap of the inner groove side plate 9 (the root gap between the inner groove side plates 9 arranged in the vertical direction), and the "load" indicates the suspension of the lifting device 18. load. Further, the horizontal axis indicates the jack position of the lift device 18 of #1 to #30, the left vertical axis indicates the root gap of the inner groove side plate 9, and the right vertical axis indicates the hanging load of the lift device 18.

As shown in Fig. 8, when the five lifting devices 18 are grouped and equalized, the hanging load greatly changes. In this example, the variation of the hanging load of the lifting device 18 of #18 to #26 becomes large, and the root clearance of the inner groove side plate 9 in the position of the lifting device 18 of #18 becomes particularly large. . As described above, in the lift system 200 shown in Fig. 8, the proper root gap of the inner groove side plate 9 cannot be ensured.

On the other hand, when the two lifting devices 18 adjacent to each other in the circumferential direction are equalized, as shown in FIG. 8, the fluctuation of the hanging load is small. In this example, although the hanging load of the lifting device 18 of #1 to #30 may be slightly variable, it will roughly follow the designed hanging load (design load) and is close to the design value. Further, the maximum value of the root gap of the inner groove side plate 9 of the lift system 100 is suppressed to about one third of the lift system 200 shown in Fig. 8.

Thus, according to the lifting system 100 shown in FIG. 6, the appropriate root gap of the inner groove side plate 9 can be ensured by equalization, and The requirement of both the root gap of the inner groove side plate 9 and the uniformity of the hanging load of the lifting device 18 can be highly satisfied.

Furthermore, although other combinations of equalization have been experimentally/verified (for example, a case where three or four lifting devices 18 are one group and a case where the lifting devices 18 are overlapped), None of them can meet the requirements of both the root gap of the inner groove side plate 9 and the uniformity of the hanging load of the lifting device 18. Therefore, it is understood that the two lifting devices 18 adjacent to each other in the circumferential direction of the lifting object 51 are grouped, and the lifting of the lifting device 100 of the two equalizers 101 of the group is connected by the oil communication path 102. The method is most appropriate.

As described above, according to the present embodiment described above, the synchronization method of the lifting system 100 for lifting the lifting object 51 by the plurality of lifting devices 18 adopts the following method: the plurality of lifting devices 18 are spaced apart The oil pressure type equalizer 101 for adjusting the hanging load is disposed around each of the plurality of lifting devices 18, and two adjacent ones in the circumferential direction of the lifting object 51 are disposed. The lifting device 18 is provided in a group, and the two equalizers 101 of the group are connected by an oil communication path 102. Thereby, an appropriate root gap of the inner groove side plate 9 can be ensured, and the hanging load of the plurality of lifting devices 18 can be made uniform.

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

In the above embodiment, in order to lift the cylindrical type The lift system 100 is used for the structure of the groove (the groove roof structure and the inner groove structure), but the present invention is not limited thereto. The synchronizing method of the lift system of the present invention can be utilized even when a plurality of lifting devices disposed at intervals around the lifting object are used for lifting the lifting object. In particular, in order to achieve uniformity of the heights of the plurality of supported portions of the weights supported by the plurality of lifting devices and the lifting load of the plurality of lifting devices, The synchronization method of the lift device of the present invention can be suitably utilized.

In the above embodiment, a plurality of gantry stages 10 for supporting the inner groove side plates 9 when assembling the inner grooves are provided inside the PC wall 2, but the present invention is not limited to this method. That is, the inner groove side plate 9 can be supported by the base plate 1 (specifically, the bottom liner 6 provided on the upper surface of the base plate 1) without using the portal frame 10.

2‧‧‧PC wall

18‧‧‧ Lifting device

51‧‧‧ lifting objects

52‧‧‧Slot roof structure

53‧‧‧Internal structure

100‧‧‧ Lifting system

101‧‧‧Equalizer

102‧‧‧ oil communication road

Claims (2)

A method for synchronizing a lifting system is a method for synchronizing a lifting system for lifting a lifting object by a plurality of lifting devices, wherein the synchronization method is configured to arrange the plurality of lifting devices at intervals a periphery of the weight; a hydraulic equalizer for adjusting the hanging load in each of the plurality of lifting devices; and two aforementioned liftings adjacent to each other in the circumferential direction of the lifting object by the oil communication path The two aforementioned equalizers of the device are connected. A method for constructing a cylindrical groove, the cylindrical groove having a double-shell structure of an inner groove and an outer groove, the construction method comprising: a plurality of lifting devices arranged in the outer groove a lifting step of lifting a lifting object including at least one of a groove roof structure and an inner channel structure; and performing the following operation before the lifting step: arranging the plurality of lifting devices at intervals a periphery of the lifting object; a hydraulic type equalizer for adjusting a hanging load in each of the plurality of lifting devices; and two liftings adjacent to each other in the circumferential direction of the lifting object by an oil communication path The two aforementioned equalizers of the liter device are connected.