JP2016098509A - Construction method for cylindrical tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a cylindrical tank, in which working stability is improved by avoiding trouble resulting from the horizontal shake of an inner tank at its roof side due to wind or the like.SOLUTION: The construction method is provided for the cylindrical tank having the metallic inner tank and a concrete outer tank. It includes a step of assembling an annular knuckle part, a step of providing a plurality of knuckle supports in the peripheral direction of the knuckle part, a step of providing the knuckle supports with respective extensive stretch jacks opposed to the side wall of the outer tank, and a step of lifting the knuckle part up using a plurality of jack-up devices and mounting an inner tank side plate to the lower side of the lifted-up knuckle part to assemble the inner tank. In the step of assembling the inner tank, during lifting the knuckle part up, the stretch jacks are elongated to be stretched between the side wall of the outer tank and each of the knuckle supports until the knuckle part is fixed to the side wall of the outer tank.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for constructing a cylindrical tank.

  A double-shell cylindrical tank having an inner tank and an outer tank is used for storing low-temperature liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas). Patent Document 1 discloses a construction method for a cylindrical tank having a metal inner tank and a concrete outer tank.

  Patent Document 1 discloses a technique for simultaneously constructing a metal inner tank and a concrete outer tank in order to shorten the construction period of the cylindrical tank. Specifically, a gantry is installed along the inner peripheral surface of the lower stage of the outer tub. Next, on this gantry, the jack-up device raises the inner tub side plate, and the next to the lower side of the raised inner tub side plate. The inner tank is assembled by alternately repeating the welding of the inner tank side plate. In parallel with the assembly of the inner tank, the outer tank is also constructed sequentially from the lower stage side to the uppermost stage.

JP 2012-149416 A

  By the way, in the technique of the said patent document 1, when raising an inner tank side board with a jackup apparatus, raising the inner tank roof attached to the knuckle plate (knuckle part) on the uppermost inner tank side board together, etc. Then, the inner tank side plate as the next stage is attached in sequence. However, in such a process, if an earthquake or strong wind occurs while the inner tank roof is suspended by the jack-up device and the ascent is stopped, the inner tank roof etc. will be greatly displaced horizontally in the outer tank. there's a possibility that. Even if the wind is not strong, the inner tank roof and the like sways horizontally in the outer tank by receiving the wind, which is one factor that impairs the stability of the construction.

  That is, since the attachment part of the jackup apparatus with respect to the inner tank roof side protrudes outside, there exists a possibility that an attachment part may collide with the internal peripheral surface of an outer tank by the shaking of an inner tank roof, and may be damaged. Furthermore, there is a risk that the inner tank roof side may be broken or the outer tank may be broken due to the concentrated load of the mounting portion by shaking greatly during an earthquake or strong wind.

  The present invention has been made in view of the above circumstances, and the object of the present invention is that while the roof side of the inner tank is suspended by a jack-up device, the roof side of the inner tank is horizontal due to the influence of wind or the like. An object of the present invention is to provide a method for constructing a cylindrical tank that eliminates inconvenience caused by shaking and improves the stability of construction.

  The cylindrical tank construction method of the present invention is a cylindrical tank construction method having a metal inner tank and a concrete outer tank, and a step of assembling an annular knuckle portion inside the outer tank. And a step of providing a plurality of knuckle supports in the circumferential direction on the knuckle portion, a step of providing a stretchable jack on the knuckle support to face the side wall of the outer tub, and a plurality of jack-up devices. A step of lifting and lifting the knuckle part, attaching an inner tank side plate to the lower side of the raised knuckle part and assembling a metal inner tank, and in the process of assembling the inner tank, lifting the knuckle part The jack is extended between the side wall of the outer tub and the knuckle support, and the knuckle portion is moved to the outer tub. Characterized in that fixed to the side walls.

  Further, in the method for constructing the cylindrical tank, in the step of providing a plurality of knuckle supports in the knuckle portion, a step of assembling the inner tub by providing a suspended portion connected to the jack-up device on the plurality of knuckle supports. Preferably, the method includes a step of attaching the plurality of jackup devices between a suspended portion for hanging the jackup device provided on the side wall of the outer tub and the suspended portion.

  Moreover, in the construction method of the cylindrical tank, it is preferable that the tension jacks are provided on all of the plurality of knuckle supports.

  Further, in the method for constructing the cylindrical tank, in the step of assembling the annular knuckle portion inside the outer tub, the knuckle portion is attached to the upper side of the pre-assembled annular inner tub side plate, and assembled. In the step of assembling the manufactured inner tub, it is preferable to attach the next inner tub side plate to the lower inner tub side plate raised by the plurality of jack-up devices.

  Moreover, in the construction method of the cylindrical tank, a space keeper that protrudes outward from the knuckle support is provided between the adjacent knuckle supports on the outer peripheral surface of the knuckle part before the step of assembling the inner tank. It is preferable.

  According to the construction method of the cylindrical tank of the present invention, when the knuckle part is lifted and lifted by the jack-up device and the roof side of the inner tank is suspended, the jack is extended to extend the side wall of the outer tank and the knuckle support. Since the knuckle part is fixed to the side wall of the outer tank, the knuckle part and the inner tank roof can be prevented from shaking in the horizontal direction due to the influence of an earthquake or wind. Thereby, the inconvenience that an inner tank roof or an outer tank breaks can be prevented reliably. Further, since the horizontal shaking of the inner tank roof or the like is prevented, the stability of the construction can be improved.

It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a principal part longitudinal cross-sectional view for demonstrating the attachment state of a knuckle support, a tension jack, and a space keeper. It is a principal part top view for demonstrating the attachment state of a knuckle support, a tension jack, and a space keeper. It is a top view of the roof side containing the outer tank roof bone for demonstrating the attachment state of a knuckle support and a space keeper. It is a perspective view which shows schematic structure of a thrust jack. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a principal part longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the process in one Embodiment of this invention.

  Hereinafter, an embodiment of a method for constructing a cylindrical tank according to the present invention will be described in detail with reference to the drawings. In the following drawings, the scale of each member is appropriately changed to make each member a recognizable size. In the following description, a ground type PC (prestressed concrete) double-shell storage tank for storing LNG is exemplified as the cylindrical tank.

First, as shown in FIG. 1, construction of a substantially disc-shaped base plate (bottom of the outer tub) 1 is performed, and a bottom liner (not shown) is formed on the top surface thereof. In that case, in this embodiment, the inner tank anchor strap 2 is installed along the circumferential direction of the base plate 1 inside the outer peripheral edge of the base plate 1.
Next, on the outer peripheral edge of the base plate 1, outside the inner tank anchor strap 2, a part of the side wall (PC wall) 3 of the outer tank, for example, the fifth stage of the side wall 3 formed by stacking nine stages in total ( To # 5).

  In addition, a construction port 4 is formed in a part of the side wall (PC wall) 3 of the outer tank formed here from the lower side, for example, from the second stage to the third stage. Further, in order to form a side wall 3 consisting of nine steps by stacking the remaining side walls on a part of the side wall 3, it is necessary to assemble a formwork for the remaining steps. The suspension scaffold 5 is installed on the upper side of a part of the side wall 3, for example, on the fourth or higher stage.

  When a part of the side wall 3 of the outer tub is formed in this way, a plurality of leg-mounted bases 6 for assembling the inner tub side plate are installed on the inner peripheral surface side of the side wall 3 along the circumferential direction. The gantry 6 with a leg is a portal gantry for supporting an inner tank side plate described later. The leg mount 6 is installed on the base plate 1 so as to straddle the annular region X, which is a region where a cylindrical inner tub formed by combining a plurality of inner tub side plates is finally lowered.

  Next, as shown in FIG. 2, concrete is cast on a part of the side wall 3 to form a sixth-stage (# 6) side wall. In addition, when constructing such a side wall 3, the suspension scaffold 5 is also sequentially moved upward as the upper side is sequentially formed.

In parallel with this, a plurality of inner tank side plates 7 that are part of the side walls of the inner tank are erected along the circumferential direction of the side walls 3 on the leg-mounted base 6, and these inner tank side plates 7 are adjacent to each other. Welding together in the lateral direction. Thereby, each inner tank side plate 7 is assembled in an annular shape. The inner tank side plate 7 assembled here corresponds to the uppermost stage (the ninth stage [# 9] in the present embodiment). The inner tank side plate 7 is formed of a Ni steel material having excellent toughness and strength.
In addition, inside the side wall 3, the roof mount 8 is assembled at the center portion of the foundation plate 1.

  Next, as shown in FIG. 3, each plate of the knuckle plate 9 (knuckle part) is attached to the upper end of the uppermost inner tank side plate 7, thereby assembling the knuckle plate 9 and attaching it to the upper end of the inner tank side plate 7. Attach to. The knuckle plate 9 is formed to be curved downward at the outer peripheral edge of the inner tank roof described later, and as described above, the upper end of the uppermost inner tank side plate 7 is at the lower end thereof. Connected.

  As shown in FIGS. 4 to 6, the knuckle plate 9 is attached with a knuckle support 10 (knuckle reinforcing material) on the outer peripheral surface thereof. In the present embodiment, as shown in FIG. 6, a plurality (for example, 30) of knuckle supports 10 are provided at equal intervals along the circumferential direction of the knuckle plate 9. In the present embodiment, one space keeper 11 is provided between adjacent knuckle supports 10. In FIG. 6, reference numeral 12 denotes a roof bone of an outer tub roof described later, and reference numeral 13 denotes a gondola rail. Moreover, in FIG. 6, description of the tension jack 50 mentioned later is abbreviate | omitted.

  The knuckle support 10 is made of a steel plate for forming a suspended portion connected to a jack-up device described later, and a pair of support plates 10a formed in a substantially triangular shape in side view as shown in FIGS. The suspended plate 10b having a substantially square shape in plan view sandwiched between the support plates 10a, and the support plate 10a sandwiched between the support plate 10a and the support plate 10a and connected to the upper surface side of the suspended plate 10b. And a reinforcing plate 10c that reinforces the space between the suspension plate 10b and the suspended plate 10b.

  As shown in FIG. 4, the support plate 10 a has one side portion that is curved corresponding to the curved shape of the knuckle plate 9, joined to the curved surface of the knuckle plate 9, and is attached and fixed by welding or the like. The suspended plate 10b and the reinforcing plate 10c are attached and fixed between the support plates 10a by welding, bolting or the like as shown in FIG. Here, the suspended plate 10b is fixed between the support plate 10a and the support plate 10a with its outer end (end on the side wall 3 side) aligned with the outer end of the support plate 10a.

  The suspended plate 10b is formed with a notch 10d that opens toward the side opposite to the knuckle plate 9, that is, toward the side wall 3 of the outer tub. This notch 10d serves as a suspended point connected to a jack-up device described later. Therefore, the suspended plate 10b in which such a notch 10d is formed is the suspended portion in the present invention. Further, on both sides of the notch 10d, a rib plate 10e having a triangular shape in side view is integrally formed between the suspended plate 10b and the reinforcing plate 10c.

  Further, in this embodiment, a thrust jack 50 is attached to all such knuckle supports 10. As shown in FIG. 7, which is a perspective view showing a schematic configuration, the tension jack 50 is formed by a conventionally known giraffe jack. The giraffe jack adjusts and pressurizes the length of the cutting beam that receives pressure by its own expansion and contraction. The pair of support portions 51 and 51 are arranged opposite to each other, and these support portions 51 and support A jack handle 52 provided between the portions 51 and a beam 53 provided integrally on the outside of the support portion 51 are configured to be extendable and contractable.

  The support portion 51 has a female screw portion, and the jack handle 52 has male screw portions 52a that are respectively engaged with the female screw portion of the support portion 51 at both ends thereof. The male screw portion 52a and the male screw portion 52a are threaded in directions opposite to each other. Further, the female screw portion of the support portion 51 that is screwed into the male screw portion 52a is also threaded in a direction opposite to each other between the pair of support portions 51 and the support portion 51.

  With such a configuration, the thrust jack 50 (giraffe jack) is configured such that when the jack handle 52 is turned in one direction, the pair of support portions 51 are separated from each other to extend between the cut beams 53 and is turned in the other direction to be paired with the pair of support portions 51. Is approaching, and the space between the cut beams 53 is shortened. That is, when the jack handle 52 is turned to one side, the jack handle 52 is extended to be able to exert a tension force, and by being turned to the other side, the jack handle 52 is shortened to release the tension force.

  And this thrust jack 50 is attached and fixed to the knuckle support 10 in this embodiment. That is, as shown in FIGS. 5 and 7, the knuckle support 10 is disposed between the support plate 10a and the rib plate 10e on one side of the notch 10d on the suspended plate 10b. One cut beam 53 is fixed to the reinforcing plate 10c by welding or the like. Thereby, the other beam 53 is made to oppose the side wall 3 of an outer tank, and is protruded slightly outside the outer end of the suspended board 10b even in the shortened state. Therefore, when the knuckle plate 9 is lifted and raised in the process of assembling the inner tank as will be described later, the jack 50 is extended by turning the jack handle 52 in one direction, and the other beam 53 is attached to the outer tank. It can be brought into contact with the side wall 3. That is, it becomes possible to stretch the stretched jack 50 between the side wall 3 and the knuckle support 10. In attaching and fixing the tension jack 50 to the knuckle support 10, a spacer 54 such as a piece of wood is provided between the suspended board 10 b and the tension jack 50 as necessary.

  The space keeper 11 is provided on the outer peripheral surface of the knuckle plate 9 so as to protrude outward from the knuckle support 10, and as shown in FIG. 6, the knuckle support provided at regular intervals along the circumferential direction of the knuckle plate 9. 10, that is, between adjacent knuckle supports 10. These space keepers 11 are disposed at substantially the center between the adjacent knuckle supports 10, whereby the space keepers 11 are also provided at equal intervals along the circumferential direction of the knuckle plate 9. Accordingly, the space keeper 11 and the knuckle support 10 are alternately arranged at equal intervals along the circumferential direction of the knuckle plate 9, and the strut jack 50 and the space keeper 11 provided on the knuckle support 10 are also knuckle. The plates 9 are alternately arranged along the circumferential direction.

  As shown in FIG. 5, such a space keeper 11 includes, for example, a pair of steel plates (not shown) attached to the knuckle plate 9 in the same manner as the support plate 10a, and H steel 11a sandwiched between these steel plates. And a steel plate 11b attached to the outer end surface of the H steel 11a. In this embodiment, the space keeper 11 has a distance from the center of the knuckle plate 9 to the outer end of the space keeper 11 such that the outer end of the suspended plate 10b that forms the suspended portion from the center of the knuckle plate 9 It is formed and arranged to be longer than the distance up to.

  That is, the outer end of the suspended plate 10b that forms the suspended portion is disposed so as to be located substantially on the circumference (same circumference) of one circle formed concentrically with the knuckle plate 9. Yes. On the other hand, the outer end of the space keeper 11 is arranged so as to be positioned on a circumference slightly larger than the circle formed by the outer end of the suspended plate 10b. For example, the extension jack 50 is positioned substantially on the same circumference as the outer end when the extension jack 50 is shortened (the outer end of the other cut beam 53).

  Accordingly, even when the knuckle plate 9 is being lifted by the jack-up device as will be described later, even if the knuckle plate 9 is greatly displaced in the horizontal direction due to the influence of an earthquake or the like, Since the space keeper 11 also collides with the side wall 3 of the outer tub together with the tension jack 50, the load at the time of the collision can be dispersed, and damage to the tension jack 50 and damage to the side wall 3 can be prevented. In addition, since the projecting jack 50 and the space keeper 11 collide with the side wall 3 of the outer tub before the knuckle support 10 (suspended plate 10b) as a suspended portion, the knuckle support 10 and the knuckle plate 9 are damaged. Can be prevented.

  The space keeper 11 is positioned on substantially the same circumference as the outer end of the suspended board 10b without positioning the outer end thereof on the same circumference as the outer end of the stretched jack 50. Also good. In such a case, even if the jack jack 50 collides with the side wall 3 due to the influence of an earthquake or the like and breaks, and the knuckle support 10 collides with the side wall 3 of the outer tub, the space keeper 11 also moves on the side wall 3 of the outer tub together with the knuckle support 10. Since it collides, the load at the time of a collision can be disperse | distributed.

Next, as shown in FIG. 8, the inner tank roof block is mounted on the roof mount 8 to assemble the inner tank roof 14 (tank roof portion), and the assembled inner tank roof 14 is attached to the knuckle plate 9. In FIG. 8 to FIG. 18, the description of the tension jack 50 is omitted.
In addition, an aerial work vehicle (not shown) is placed on the basic version 1. Further, a part of the annular portion 16 is constructed to form the annular portion 16 in the annular region X under the legged mount 6. Also, the side walls 3 of the outer tub are sequentially stacked on the upper side, and the side walls 3 of the outer tub are constructed up to the ninth stage (# 9) as the final stage. At this time, the suspended scaffold 5 for forming the side wall 3 remains in a state of being assembled, for example, from the sixth stage to the seventh stage or more.

  Next, as shown in FIG. 9, on the knuckle plate 9, in a state of being separated from the inner peripheral surface of the side wall 3 of the outer tub and at a height that does not interfere with the suspension scaffold 5, the scaffold 17 for the jack-up device. Assemble. The jack-up device scaffold 17 is formed in a ring shape along the circumferential direction of the knuckle plate 9 formed in a ring shape, thereby preventing a fall in the radial direction. Further, when assembling, the knuckle support 10 is almost entirely supported, and a collapse prevention material (not shown) is provided between the knuckle plate 9 and the inner tank roof 14, so that the knuckle plate 9 and the inner tank are provided. A jack-up device scaffold 17 is formed in a state of being fixed to the roof 14. In the present embodiment, as shown in FIG. 9, the jackup device scaffold 17 is assembled corresponding to the fourth step (# 4) to the fifth step (# 5) of the side wall 3 of the outer tub.

  Then, by using this jack-up device scaffold 17, the suspension bases 18 (suspending portions) are equally spaced in the circumferential direction of the side wall 3 at a predetermined position of the side wall 3, in this embodiment, at the fifth stage (# 5). Install multiple units. That is, the suspension base 18 is firmly and detachably fastened and fixed to, for example, an anchor plate or the like embedded in the side wall 3 in advance, and is projected substantially horizontally from the side wall 3 toward the inside thereof.

  Next, the jack-up device 19 is attached between the suspension base 18 and the suspended plate 10 b of the knuckle support 10. The jack-up device 19 is configured as a center hole jack as shown in FIG. 10, and has a jack body 20a engaged with and supported by the suspension base 18, an upper end portion attached to the jack body 20a, and a lower end portion. A jack-up rod 20 attached to the suspended plate 10b of the knuckle support 10 and a nut 19a for attaching the lower end of the jack-up rod 20 to the suspended plate 10b are configured. In addition, in FIG. 10, description of the scaffold 17 for jackup apparatuses is abbreviate | omitted in order to make it easy to see.

  The jack-up device 19 is attached by hanging the jack-up rod 20 in a state where the jack body 20a is engaged and fixed on the suspension base 18, and the lower end portion of the jack-up rod 20 is attached to the knuckle support 10. It inserts in the said notch 10d of the to-be-suspended board 10b. And the lower end part of the jackup rod 20 is fixed to the suspended board 10b with the nut 19a prepared previously.

  In this way, when a plurality of jack-up devices 19 are installed at predetermined intervals in the circumferential direction of the side wall 3 of the outer tub, and further attached to the suspended plate 10b of the knuckle support 10, respectively, as shown in FIG. Remove. When the roof mount 8 is removed, the weight of the tank constituent member is held by the plurality of jackup devices 19.

  Here, as shown in FIG. 9, the position where the suspension base 18 is provided is the fifth step (# 5) of the side wall 3, and the position where the knuckle support 10 is provided is the third step (# 3) of the side wall 3. Therefore, the jack-up rod 20 is formed to have a sufficient length corresponding thereto. However, the jack-up rod 20 formed in such a length is located immediately above the jack-up rod 20 when the jack-up device 19 is operated to raise the jack-up rod 20 as will be described later. It will be interfered by the suspension scaffold 5.

  Therefore, the jack-up rod 20 is formed by connecting a plurality of rods 20b in the longitudinal direction as shown in FIG. 10, and these are configured to be detachable by screwing or the like. Thus, when the jackup rod 20 is raised, the jackup rod 20 is prevented from interfering with the suspension scaffold 5 by separating the rod 20b protruding upward from the suspension base 18 from the lower rod 20b. can do. In addition, the code | symbol 21 in FIG. 9 is a suspension balance for lifting / suspending each component of the jackup apparatus 19, or suspending the separated rod 20b, and one end of the balance rod 21a. It is a well-known thing comprised with the weight 21b in a part. The suspension balance 21 is suspended by a crane (not shown), and thereby the operations of raising and lowering and horizontal movement are controlled.

  Further, during such a process, the cold insulation work for the annular portion 16 and the cold insulation work for the central portion are performed in parallel on the foundation plate 1. As shown in FIG. 10, the cold insulation work of the annular portion 16 is performed by assembling a pearlite concrete block 23 a, a pearlite concrete block 23 b, and a structural lightweight concrete block 24 on the bottom thermal resistance reducing material 22, under the legged base 6. This is done by attaching an annular plate 16a thereon. The annular portion 16 finally supports the assembled inner tank side plate 7, the annular plate 16 a is formed thick, and its cold insulation structure is also formed of a hard material such as a concrete block.

  Next, as shown in FIG. 11, the knuckle plate 9 is lifted by the jack-up device 19 so that the knuckle plate 9 and the inner tank roof 14, the inner tank side plate 7, the knuckle support 10, the thrust jack 50, The tank constituent member Y including the space keeper 11 and the jackup device scaffold 17 is raised. Specifically, the jack up rod 20 is raised by driving the jack main body 20 a in the normal direction, and the tank constituent member Y being assembled together with the knuckle support 10 is jacked up.

  Here, the knuckle plate 9 lifted by the jack-up device 19 is for connecting the inner tank roof 14 and the inner tank side plate 7, and is sufficiently thicker than the inner tank side plate 7 and has a high strength. Even if a weight including the inner tank side plate 7, the inner tank roof 14, and the jackup device scaffold 17 is added, there is no concern about buckling.

  The tank component Y including the knuckle plate 9 and the inner tank roof 14 and the like supported by the jack up device 19 is raised (lifted) by almost one step of the inner tank side plate 7, and then the rise by the jack up device 19 is stopped. Then, the jack handle 52 of the tension jack 50 shown in FIG. 7 attached to the knuckle support 10 is rotated, and the tension jack 50 is extended so that the other beam 53 is abutted against the side wall 3 of the outer tub. Thereby, the tension jack 50 is stretched between the side wall 3 and the knuckle plate 9 via the knuckle support 10. At that time, it is preferable to provide a spacer such as a piece of wood between the side wall 3 and the other cut beam 53 as needed to prevent the concrete side wall 3 from being damaged.

  In this manner, the cut beams 53 of all the thrust jacks 50 are abutted against the side wall 3 and are stretched, so that the annular knuckle plate 9 is attached to the inner surface of the side wall 3 of the outer tub via the tension jack 50 and the knuckle support 10. Can be supported and fixed in all directions. Therefore, it is possible to prevent the knuckle plate 9, the inner tank roof 14, and the like from shaking in the horizontal direction due to the influence of an earthquake or wind in the subsequent process. Therefore, since the knuckle plate 9 and the inner tank roof 14 do not shake in the horizontal direction in the subsequent steps, the construction can be performed stably. When the cut beams 53 of all the tensioning jacks 50 are in contact with the side wall 3 in this way, the space keeper 11 is maintained in a state where the outer end thereof is opposed to the side wall 3 with a predetermined interval. .

  Next, the next inner tank side plate 7 is carried into a space formed below the inner tank side plate 7. The inner tank side plate 7 is carried in via a construction port 4 provided in the side wall 3. A first transport device (not shown) is provided around the work port 4, and the inner tank side plate 7 is sequentially transported from the outside of the side wall 3 through the work port 4 onto the legged stand 6 by this transport device. The In addition, a second transport device (not shown) is provided on the leg-mounted base 6 along the circumferential direction of the side wall 3. This 2nd conveying apparatus is comprised with the rail (not shown) etc. which follow the circumferential direction of the side wall 3, etc., and also the inner tank side board 7 conveyed on the stand 6 with a leg further Are sequentially conveyed in the circumferential direction.

  Next, the inner tank side plate 7 that has been conveyed by the second conveying device is erected on the gantry 6 with legs, and is arranged in an annular shape below the jacked up inner tank side plate 7. Then, as shown in FIG. 12, these inner tank side plates 7 are welded together in the lateral direction, and the inner tank side plates 7 arranged vertically are also welded together so that these inner tank side plates 7 are integrated. Are formed in an integral cylindrical shape. That is, the 8th (# 8) inner tank side plate 7 is attached below the 9th (# 9) inner tank side plate 7 which is the uppermost stage.

  A plurality of inner tank side plates 7 are connected in advance in the lateral direction outside the side wall 3 of the outer tank, taken into the side wall 3 and formed into an annular shape, and then the inner tank side plates 7 arranged vertically are welded together. You may do it. In this way, by performing the plurality of inner tank side plates 7 outside the side wall 3 with a limited work space, welding work is facilitated and the inner tank can be assembled efficiently.

  When the jack-up is performed as described above, the jack-up device 19 has the upper end of the jack-up rod 20 projecting upward from the suspension base 18 as shown in FIG. Will be interfered with. Therefore, while the inner tank side plates 7 are welded to each other, the portions of the plurality of rods 20b constituting the jackup rod 20 that protrude upward from the suspension base 18 are removed. Then, it is lowered onto the inner tank roof 14 by a davit (not shown) previously installed on the top of the jackup device scaffold 17. The rod 20b is removed using the jackup device scaffold 17. Also, the upper side of the jack-up device scaffold 17 is sequentially removed by the suspension balance 21 so as not to interfere with the suspended scaffold 5.

Next, the jack handle 52 of the strut jack 50 shown in FIG. 7 is turned to shorten the strut jack 50, and the struts 53 are released from the struts 53 against the side walls 3 of the outer tub. Thereby, support and fixation of the knuckle plate 9 (knuckle support 10) etc. by the inner surface of the side wall 3 are released.
Subsequently, the tank component Y is raised by almost one step of the inner tank side plate 7 by the jack-up device 19, and the next inner tank side plate 7 is further carried into the space formed below the inner tank side plate 7. As in the case of the eighth stage (# 8) inner tank side plate 7, the seventh stage (# 7) inner tank side plate 7 is attached as shown in FIG. At that time, after the ascent by the jack-up device 19 is stopped, the strut jack 50 is extended so that the beam 53 is abutted against the side wall 3 of the outer tub and is stretched. Further, when the ascending by the jack-up device 19 is resumed or the jack-down described later is performed, the strut jack 50 is shortened and the struts 53 are abutted against the side wall 3 of the outer tank and the strut is released. Further, the rod 20 b protruding upward from the suspension base 18 is removed and lowered onto the inner tank roof 14 by the suspension balance 21.

  When the inner tank side plates 7 from the ninth stage (# 9) to the seventh stage (# 7) are attached in this way, the suspended scaffold 5 on the inner peripheral surface side of the side wall 3 is removed as shown in FIG. That is, since sufficient time has passed so far, the side wall 3 of the outer tub has been completed up to the 9th stage (# 9), which is the uppermost stage, and thus the formwork can be removed. Therefore, the inner peripheral surface side of the side wall 3 can be removed. In addition, about the outer peripheral surface side of the side wall 3, since it is needed at a post process, it leaves as it is, without removing.

  Next, in order to change the size of the jack-up device 19, a second suspension base 25 is installed on the top of the side wall 3 of the outer tub as shown in FIG. In addition, the tank constituent member Y (including the eighth and seventh inner tank side plates 7) is once lowered onto the leg-mounted base 6 by jacking down. At that time, as described above, the strut jack 50 is shortened in advance, and the abutment against the side wall 3 of the outer tub by the other cut beam 53 and the strut are released.

  Subsequently, the jack-up rod 20 of the jack-up device 19 shown in FIG. 10 is once removed from the suspended plate 10b of the knuckle support 10 by using a suspension balance 21, a crane or the like. Further, the jack body 20 a of the jack-up device 19 is removed from the suspension base 18. Thereby, the jackup apparatus 19 is removed from between the side wall 3 of the outer tub and the knuckle plate 9. Further, the suspension base 18 is removed from the side wall 3.

  And the jack main body 20a of the jack-up apparatus 19 is attached to the 2nd suspension mount frame 25 shown in FIG. Further, at that time, the jack-up rod 20 was previously removed from the inner tank roof 14 so as not to be interfered with the suspension scaffold 5 and lowered onto the inner tank roof 14. 5 is removed so that the jack-up rod 20 can be extended freely. Therefore, the rod 20b that has been lowered onto the inner tank roof 14 is attached to the jack-up rod 20 again, and the jack-up rod 20 is lengthened. In this embodiment, as shown in FIG. 13, in order to hang down from the 9th stage (# 9) to the 5th stage (# 5), which is the uppermost stage of the side wall 3 of the outer tub, a spare rod 20b prepared separately in advance is used. Add and adjust the jack-up rod 20 to the desired length.

  When the jack-up rod 20 is adjusted to a desired length in this way, the lower end side thereof is again inserted into the notch 10d of the suspended plate 10b of the knuckle support 10. And the lower end part of the jackup rod 20 is fixed to the suspended board 10b with the nut 19a. Thereby, the jackup apparatus 19 can be replaced. When the rearrangement of the jack-up device 19 is thus completed, the jack-up device scaffold 17 is removed as shown in FIG.

Next, as shown in FIG. 15, the knuckle plate 9 is lifted by the jackup device 19, and the tank constituent member Y is raised by almost one step of the inner tank side plate 7. Then, all the tension jacks 50 attached to the knuckle support 10 are extended, and the respective beams 53 are abutted against the side walls 3 of the outer tub and are stretched.
Subsequently, the next inner tank side plate 7 is further carried into the space formed below the inner tank side plate 7, and hereinafter, the above-described inner tank side plate 7 of the eighth stage (# 8) and the seventh stage (# 7). In the same manner as described above, the sixth-stage (# 6) inner tank side plate 7 is attached as shown in FIG.

Next, the outer tank roof 26 is attached on the inner tank roof 14 in a state where the knuckle plate 9 and the like are supported on the inner surface of the side wall 3 of the outer tank by the tension jack 50. The outer tub roof 26 is attached by attaching a connecting material (not shown) made of a number of channel steels on the inner tub roof 14 and attaching the outer tub roof 26 to these connecting materials.
Moreover, the operation | work which sticks a side part liner (not shown) with respect to the internal peripheral surface of the side wall 3 of an outer tank is started.

Hereinafter, the tank component Y is lifted by the jack-up device 19, the next inner tank side plate 7 is loaded below the inner tank side plate 7 (tank component Y), and the tank component Y (inside Attaching to the tank side plate 7) and abutment (stretching) by the cut beam 53 to the side wall 3 by extension of the tension jack 50 at that time, and releasing the abutment of the cut beam 53 to the side wall 3 by shortening the tension jack 50 Are sequentially repeated, and as shown in FIG. 17, the inner tank side plate 7 is attached up to the first level (# 1) of the lowest level. Thereby, the side wall of an inner tank is completed.
In addition, when the inner tank side plate 7 of each stage is attached, that is, while the tank constituent member Y is lifted and the space below is used as a space, various materials 27 are placed on the side walls separately from the loading of the inner tank side plate 7. Carry on the basic version 1 in 3. A work scaffold 28 is assembled on the outer tank roof 26.

Next, as shown in FIG. 18, the leg mount 6 is removed, so that the space below the tank constituent member Y is made space. At that time, the extension jack 50 is extended so that the cut beam 53 is abutted against the side wall 3 and is extended.
Thereafter, the thrust jack 50 is shortened to release the butting of the cut beam 53 to the side wall 3. Then, the jack constituent device Y is jacked down by the jack-up device 19 and the outer peripheral end of the roof bone 12 of the outer tub roof 26 is connected to a mounting end (not shown) embedded in the top inner peripheral surface of the side wall 3 of the outer tub. And fix.
Then, the connection material (not shown) which connects between the outer tank roof 26 and the inner tank roof 14 is removed, and the connection between these is cancelled | released.

Next, as shown in FIG. 19, the tank constituent member Y is jacked down again by the jack-up device 19, and the lowermost lower end portion of the inner tank side plate 7 is lowered onto the annular portion 16. Then, the lowermost lower end portion of the inner tank side plate 7 is attached to the inner tank anchor strap 2 installed on the base plate 1.
Next, the knuckle support 10 is removed together with the jacking jack 50 from the knuckle plate 9, and the space keeper 11 is further removed as necessary.

Then, tension work of the side wall 3 of the outer tub is performed. Moreover, the polyurethane foam (PUF) which is a thermal resistance relaxation material is sprayed with respect to the side part liner (not shown) stuck on the internal peripheral surface of the side wall 3 of an outer tank. Further, the jack-up device 19 and the second suspension mount 25 are also removed. Then, after closing the construction port 4 and installing a pump barrel (not shown), water filling is performed and a pressure resistance / air tightness test is performed.
Finally, the inner tank and the outer tank are filled with a cold insulating material (not shown) such as pearlite, and the inner and outer tanks are cooled, and the cylindrical tank 100 is constructed through painting and piping cooling. To do.

  According to the cylindrical tank construction method of the present embodiment, when the knuckle plate 9 is lifted and lifted by the jack-up device 19 and the inner tank roof 14 is suspended, the thrust jack 50 is extended to extend the side wall of the outer tank. 3 and the knuckle support 10, and the knuckle plate 9 is supported and fixed to the side wall 3 of the outer tank via the knuckle support 10, so that the knuckle plate 9 and the inner tank roof 14 are horizontal due to the influence of an earthquake or wind. It can prevent shaking in the direction. Thereby, the inconvenience that the inner tank roof 14 and the side wall 3 of the outer tank are broken can be reliably prevented. Moreover, since the horizontal shaking of the inner tank roof 14 etc. is prevented, the stability of construction can be improved.

  Further, before the step of assembling the inner tub, a plurality of jack-up devices 19 are placed between the suspension base 18 for suspending the jack-up device provided on the side wall 3 of the outer tub and the suspended plate 10b of the knuckle support 10. Since the jack jack 50 is provided on the knuckle support 10 in advance, when the knuckle support 10 is raised and stopped by the jack-up device 19, the outer tank of the outer jack 50 is pushed by the jack jack 50. The knuckle support 10 can be supported, fixed, and released from the side wall 3.

  In addition, since the plurality of knuckle supports 10 are respectively provided with the tensioning jacks 50, all the directions of the knuckle support 10 can be supported by the side wall 3 of the outer tub, whereby the knuckle support 10 and the inner tub roof on the knuckle support 10 can be supported. 14 etc. can be stably fixed without being biased to the side wall 3 of the outer tub.

  Further, in the step of assembling the knuckle plate 9, the knuckle plate 9 is attached to the upper side of the preassembled inner tank side plate 7, and therefore, the knuckle plate 9 curved in the height direction is first assembled in an annular shape. Assembling the inner tank side plate 7 that is not curved in the height direction into an annular shape makes it easier to assemble the annular shape, and thus facilitates the assembly of the knuckle plate 9 into an annular shape.

  Further, before the step of assembling the inner tub, the space keeper 11 protruding outside the knuckle support 10 is provided between the adjacent knuckle supports 10 on the outer peripheral surface of the knuckle plate 9. Even if the knuckle plate 9 is greatly displaced in the horizontal direction due to the influence of an earthquake or the like while the plate 9 is being lifted, the space keeper 11 collides with the side wall 3 of the outer tank together with the jack 50 so that the knuckle support 10 is directly A collision with the side wall 3 can be prevented. Therefore, damage to the knuckle support 10 and the knuckle plate 9 can be prevented.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. The shapes, combinations, and the like of the 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 above-described embodiment, the tension jacks 50 are arranged on all of the many knuckle supports 10. However, the present invention is not limited to this, and every other knuckle support 10 is arranged every other or a plurality. You may make it arrange | position the jack 50 for every other.
Further, the location of the tension jack 50 with respect to the knuckle support 10 can also be set arbitrarily.

DESCRIPTION OF SYMBOLS 3 ... Side wall of outer tank, 7 ... Inner tank side plate, 9 ... Knuckle plate (knuckle part), 10 ... Knuckle support, 10b ... Suspended plate (suspended part), 11 ... Space keeper, 14 ... Inner tank roof, 18 ... Suspension stand (suspending part), 19 ... Jack-up device, 50 ... Protruding jack

Claims (5)

A construction method of a cylindrical tank having a metal inner tank and a concrete outer tank,
Assembling an annular knuckle portion inside the outer tub;
A step of providing a plurality of knuckle supports in the circumferential direction of the knuckle portion;
Providing the knuckle support with a stretchable stretch jack facing the side wall of the outer tub;
And lifting the knuckle part by a plurality of jack-up devices, raising the knuckle part, attaching an inner tank side plate to the lower side of the raised knuckle part, and assembling a metal inner tank,
In the step of assembling the inner tub, when the knuckle portion is lifted and lifted, the strut jack is extended to be stretched between the side wall of the outer tub and the knuckle support, and the knuckle portion is A method for constructing a cylindrical tank, characterized by being fixed to a side wall. In the step of providing a plurality of knuckle supports in the knuckle portion, the plurality of knuckle supports are provided with a suspended portion connected to the jackup device,
Before the step of assembling the inner tub, the step of attaching the plurality of jack-up devices between a suspension portion for suspending the jack-up device provided on the side wall of the outer tub and the suspended portion. The method for constructing a cylindrical tank according to claim 1.   The method for constructing a cylindrical tank according to claim 1, wherein the tension jack is provided on all of the plurality of knuckle supports. In the step of assembling the annular knuckle portion inside the outer tub, the knuckle portion is assembled on the upper side of the preassembled annular inner tub side plate,
In the step of assembling the metal inner tank, the next inner tank side plate is attached to the inner tank side plate below the knuckle portion raised by the plurality of jackup devices. The construction method of the cylindrical tank as described in any one of these.   The space keeper that protrudes outward from the knuckle support is provided between the adjacent knuckle supports on the outer peripheral surface of the knuckle part before the step of assembling the inner tub. A method for constructing a cylindrical tank according to claim 1.

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