JP7233241B2 - Temporary support fixed structure - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a temporary support fixing structure for fixing a temporary support for construction work to the outer tank when constructing a double-shell tank consisting of an inner tank and an outer tank.

Generally, a double shell tank having an inner tank and an outer tank is used for storing cryogenic liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas). In constructing this type of double-shell tank, the metal inner tank and the concrete outer tank are constructed at the same time in order to shorten the construction period required for the construction of the tank.

More specifically, after assembling the side wall of the outer tank to a certain height, a jack-up device is installed on the side wall via a temporary support, and the inner tank roof is lifted step by step by the jack-up device. The inner tank side plates are added to the roof in order from the top one. During the process of raising the inner tank roof, the outer tank roof is assembled on the inner tank roof.

Incidentally, the following patent document 1 and the like are prior art document information that disclose technical disclosure of the simultaneous construction of the inner tank and the outer tank in such a double-shell tank.

Patent No. 5732262

Conventionally, however, a temporary support is fixed by welding to a filler buried in the concrete forming the side wall of the outer tank, and a jack-up device is fastened to the temporary support with bolts or the like. The temporary support protrudes greatly from the side wall of the outer tank. Therefore, after the temporary support is used, it is necessary to remove it by gas cutting at a high place, which poses a problem of a heavy labor burden on the operator.

Therefore, in the present disclosure, in view of such circumstances, a temporary support fixing structure will be described that can facilitate the work of removing the temporary support at a high place and reduce the labor burden on the worker.

The present disclosure is a structure for fixing a temporary support for construction to the outer tank when constructing a double-shell tank consisting of an inner tank and an outer tank,
a filler buried in concrete forming a side wall of the outer tank;
a fastening portion connected to the fill metal;
a temporary support detachably fixed to the fastening portion;
a fastener that secures the temporary support to the fastener ;
The filler metal includes a base plate disposed on the inner periphery of the side wall of the outer tank, and an anchor bolt connected to the back surface of the base plate and embedded in the concrete of the side wall,
The fastening portion is embedded in the concrete of the side wall while being screwed to the anchor bolt, and is a female screw member having a blind alley screw hole that is welded to match the bolt hole on the back surface of the base plate and continues to the bolt hole. It relates to a temporary support fixing structure.

Further, in the temporary support fixing structure, the temporary support may be a jack support for constructing the inner tank.
Furthermore, in the temporary support fixing structure, it is preferable that the upper anchor bolts are relatively longer than the lower anchor bolts. A fixing plate forming a flat surface perpendicular to the longitudinal direction of the anchor bolt may be provided at the tip of the upper anchor bolt.

According to the above-described temporary support fixing structure of the present invention, it is possible to facilitate the work of removing the temporary support at a high place, and to greatly reduce the labor burden of the worker.

1 is a schematic diagram illustrating one embodiment of the present disclosure; FIG. FIG. 2 is an arrow view in the direction of II-II in FIG. 1; FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2; FIG. 2 is a cross-sectional view showing details of a female screw member in FIG. 1; FIG. 2 is a cross-sectional view showing details of the cap in FIG. 1; It is explanatory drawing of the jack-up work by a jack-up apparatus. FIG. 4 is a cross-sectional view of another embodiment of the present disclosure;

Hereinafter, embodiments of the present invention in the present disclosure will be described with reference to the accompanying drawings.

FIGS. 1-6 show one embodiment of the temporary support fixing structure of the present disclosure, which stores cryogenic liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas), as outlined in FIG. When constructing the double shell tank 1, the inner tank 2 made of metal and the outer tank 3 made of concrete are constructed at the same time for the purpose of shortening the construction period. That is, a jack-up device 6 is installed on the side wall 4 of the outer tank 3 assembled to a certain height via a temporary support 5, and the inner tank roof 7 is lifted by the jack-up device 6 step by step. Through the knuckle plate 8, the inner tank side plate 9 is added in order from the uppermost one.

Here, the jack-up device 6 can be, for example, a center hole jack that can lift a hanging portion 10 attached to the curved outer peripheral surface of the knuckle plate 8 via a jack-up rod 11 . 6, reference numeral 12 denotes a temporary assembly base for assembling the inner tank side plate 9;

When constructing such a double-hull tank 1, when fixing the temporary support 5 to the outer tank 3 as a jack support, in this embodiment, a temporary support fixing structure as shown in detail in FIGS. 1 to 5 is adopted. It is characterized by More specifically, a filling metal 14 is embedded in the concrete forming the side wall 4 of the outer tank 3, and the temporary support 5 is connected to a female screw member 15 (fastening portion) connected to the filling metal 14 by a bolt 16 (fastening part). It is detachably fixed by means of a tool).

Here, the filler metal 14 consists of a base plate 17 arranged on the inner periphery of the side wall 4 of the outer tank 3 and an anchor bolt 18 connected to the back surface of the base plate 17 and embedded in the concrete of the side wall 4. configured with. The base plate 17 has a rectangular plate shape and is arranged along the inner peripheral surface of the side wall 4 , and the anchor bolts 18 are perpendicular (horizontal) to the inner peripheral surface of the side wall 4 of the outer tank 3 . Embedded.

As shown in detail in FIG. 4 in particular, the connection of anchor bolts 18 to the back of the base plate 17 are embedded in the concrete of the side wall 4 with the anchor bolts 18 threaded and bolt holes 19 on the back of the base plate 17 . through an internal threaded member 15 having a blind alley threaded hole 20 which is welded to match the bolt hole 19 and which is continuous with the bolt hole 19 .

That is, the female screw member 15 has a blind alley screw hole 20 and a screw hole 21 at both ends in the longitudinal direction. A bolt 16 (fastener) passed through a bolt hole 23 of a mounting plate 22 of the temporary support 5 is screwed into one of the screw holes 20, and the bolt 16 is fastened to the female screw member 15 to fasten the temporary support. A support 5 is fixed to the base plate 17 . The anchor bolt 18 is screwed into the other screw hole 21 .

In the example shown here, the upper two-stage anchor bolts 18 are relatively longer than the lower one-stage anchor bolts 18, and the tips of the upper two-stage anchor bolts 18 have A flat fixing plate 24 is provided perpendicular to the longitudinal direction of the anchor bolt 18 . In other words, even if a strong pull-out force acts on the upper two-stage anchor bolts 18 due to the load applied when the jack-up device 6 (see FIG. 6) is installed on the temporary support 5 and the jack-up work is performed, it can withstand this. reinforced to obtain

Furthermore, as shown in detail in FIG. 5, the bottom two portions of the mounting plate 22 are directly screwed with bolts 27 through the bolt holes 26 of the mounting plate 22 into the screw holes 25 formed in the base plate 17 side. is fixed by However, a cap 28 is welded to the rear surface of the screw hole 25 formed in the base plate 17 so that the screw hole 25 is airtightly closed by the cap 28 .

An outer tank side plate 29 made of a steel liner is assembled on the inner peripheral surface of the concrete forming the side wall 4 of the outer tank 3, and also serves as a formwork when the concrete is poured. Here, the base plate 17 is arranged so as to be exposed from an opening 30 formed in the outer tank side plate 29, and the opening 30 and the outer edge portion of the base plate 17 are airtightly welded.

On the other hand, the temporary support 5 comprises a pair of I-shaped steel beams 31 protruding inward of the tank from a mounting plate 22 fastened to the base plate 17 with bolts 16. A plurality of beam members 32 serving as scaffolding extend in a horizontal direction perpendicular to the projecting direction of the beam 31 .

In addition, ribs 33 extending in the vertical direction are formed at the center and both sides of the base plate 17 of the temporary support 5 in the width direction. The strength is improved against the applied load.

By doing so, the mounting plate 22 of the temporary support 5 is overlaid on the front surface of the base plate 17, the positions of the bolt holes 19 and 23 are aligned with each other, and the bolts 16 are passed through the bolt holes 19 and 23, and the female screw member is mounted. 15, the temporary support 5 is fixed to the base plate 17, and a jack-up device 6 can be installed on the temporary support 5 to perform jack-up work. At this time, it is also possible to further fix the mounting plate 22 by fastening bolts 27 to the screw holes 25 on the side of the base plate 17 at the two lowermost positions.

Further, when the temporary support 5 is removed after the jack-up operation using the jack-up device 6 is completed, the fixing of the temporary support 5 to the base plate 17 is released only by loosening and removing the bolts 16 and 27. , the temporary support 5 can be easily removed from the base plate 17 .

Therefore, according to the above-described embodiment, the temporary support 5 is detachably fastened to the internal screw member 15 of the filler metal 14 embedded in the concrete forming the side wall 4 of the outer tank 3, and the temporary support 5 is gas-filled after use. Since the temporary support 5 can be removed without being cut, the removal work of the temporary support 5 at a high place can be facilitated, and the labor burden on the worker can be reduced compared to the conventional case.

Further, in the case of the present embodiment, the filler metal 14 is connected to a base plate 17 disposed on the inner periphery of the side wall 4 of the outer tank 3, and is connected to the back surface of the base plate 17 and embedded in the concrete of the side wall 4. Anchor bolts 18 are included. With this configuration, the base plate 17 can be firmly and stably supported by the anchor bolts 18 deeply embedded in the concrete of the side wall 4 .

The fastening portion for fixing the temporary support 5 is embedded in the concrete of the side wall 4 while being screwed to the anchor bolt 18, and is welded to match the bolt hole 19 on the rear surface of the base plate 17. A female screw member 15 having a blind alley screw hole 20 continuing to the bolt hole 19 is formed.

With this configuration, even after the bolts 16 are removed, the airtightness of the base plate 17 can be ensured by the blind alley screw holes 20, and the base plate 17 can be used as a part of the outer tank side plate 29 as it is. and eliminates the need for additional liner installation work to maintain airtightness after work is completed.

Moreover, the female screw member 15, which is a fastening portion for fixing the temporary support 5, can be incorporated into a part of the filler metal 14 and can be satisfactorily embedded in the concrete of the side wall 4. It can also contribute to the connection with the anchor bolt 18 .

Further, in this embodiment, the temporary support 5 serves as a jack support for constructing the inner tank 2 (see FIG. 6). With this configuration, the temporary support 5 can be easily fixed and removed, and the inner tank roof 7 (the outer tank roof at the advanced stage of the process) using the jack-up device 6 installed via the temporary support 5 (also included) can be efficiently performed step by step jack-up work.

In the above description, the outer tank side plate 29, which also serves as a formwork for placing the concrete, is assembled on the inner peripheral surface of the concrete forming the side wall 4 of the outer tank 3. Depending on the construction method for constructing the outer tank 3, the side wall 4 of the outer tank 3 may be formed by piling up concrete blocks. In this case, the temporary support 5 is attached and detached via the filler metal 14 and the female screw member 15 that are embedded in advance for some concrete blocks, and the jacking work as described above is performed. The outer tank side plate 29 is formed by lining the outer tank liner.

For this reason, in the case of the construction method performed by such a procedure, it is not necessary to use the female screw member 15 having the blind alley screw hole 20 as the fastening portion. For example, as shown in another embodiment in FIG. 7, it is possible to employ a sleeve-like female threaded member 15' having female threads 20' and 21' formed at both ends in the longitudinal direction and opening in the longitudinal direction.

That is, when the sleeve-shaped female screw member 15' is employed, when the temporary support 5 is removed after use, each bolt 16 is loosened and removed to open the inside of the female screw member 15' and the base plate 17 itself. airtightness cannot be maintained. However, since the outer tank side plate 29 (see the two-dot chain line in FIG. 7) will be constructed by lining the steel liner in a post-process, the base plate 17 is covered with the outer tank side plate 29 to be airtight. sex is preserved.

Also in this embodiment, the temporary support 5 is detachably fastened to the female screw member 15' of the filler metal 14 embedded in the concrete forming the side wall 4 of the outer tank 3, and the temporary support 5 is used. It is the same in that it can be removed without gas cutting, and the work of removing the temporary support 5 at a high place can be facilitated and the labor burden on the worker can be reduced more than before.

In addition, the temporary support fixing structure of the present invention is not limited only to the above-described embodiments described in the present disclosure, and the temporary support is not limited to the jack support. Of course, various changes can be made within.

1 double-shell tank 2 inner tank 3 outer tank 4 side wall 5 temporary support 6 jack-up device 7 inner tank roof 8 knuckle plate 9 inner tank side plate 10 hanging part 11 jack-up rod 12 assembly stand 13 anchor strap 14 filler metal 15 female screw member (fastening part)
15' female screw member (fastening part)
16 bolts (fasteners)
17 Base plate 18 Anchor bolt 19 Bolt hole 20 Screw hole 21 Screw hole 22 Mounting plate 23 Bolt hole 24 Fixing plate 25 Screw hole 26 Bolt hole 27 Bolt 28 Cap 29 Outer tank side plate 30 Opening 31 Beam 32 Beam member 33 Rib

Claims (4)

A structure in which a temporary support for construction is fixed to the outer tank when constructing a double-shell tank consisting of an inner tank and an outer tank,
a filler buried in concrete forming a side wall of the outer tank;
a fastening portion connected to the fill metal;
a temporary support detachably fixed to the fastening portion;
a fastener that secures the temporary support to the fastener ;
The filler metal includes a base plate disposed on the inner periphery of the side wall of the outer tank, and an anchor bolt connected to the back surface of the base plate and embedded in the concrete of the side wall,
The fastening portion is embedded in the concrete of the side wall while being screwed to the anchor bolt, and is a female screw member having a blind alley screw hole that is welded to match the bolt hole on the back surface of the base plate and continues to the bolt hole. A temporary support fixed structure that is 2. A temporary support fixing structure according to claim 1 , wherein said temporary support is a jack support for constructing said inner tank. 3. A temporary support fixing structure according to claim 1 or 2, wherein the upper anchor bolts are relatively longer than the lower anchor bolts. 4. The temporary support fixing structure according to claim 3, wherein a fixing plate forming a flat surface perpendicular to the longitudinal direction of the anchor bolt is provided at the tip of the upper anchor bolt which is relatively longer than the lower anchor bolt. .

Images