JP6106540B2 - Construction method of cylindrical tank - Google Patents

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 jack stand is erected at the bottom of the outer tub, and the jack-up device is supported at a predetermined height (see FIG. 4B of Patent Document 1). And when carrying out the side wall construction of the outer tank, the inner tank roof and the outer tank roof are assembled on the bottom of the outer tank, and then the inner tank roof and the outer tank roof are raised by the jack-up device. By installing the inner tank side plates on the roof from the uppermost one to the lowermost one in that order, simultaneous construction of the metal inner tank and the concrete outer tank is realized.

Japanese Patent Laid-Open No. 7-62924

By the way, in the prior art, a metal inner tub and a concrete outer tub are constructed at the same time, but for the reasons of construction, for example, a part of the outer tub side wall is preceded, and then the remaining part of the outer tub side wall. It is also conceivable to perform the construction of the inner tank and the construction of the inner tank in parallel.
However, in that case, a suspended scaffolding is formed on the upper part of the outer tank side wall constructed for the construction of the remaining part of the outer tank side wall, and the scaffold is removed from the lower side, which is necessary for the construction of the inner tank. It is difficult to assemble a jack-up device and to construct a stand for holding the jack-up device.

  The present invention has been made in view of the above circumstances, and the object is to precede the construction of a part of the outer tank side wall, and then perform the construction of the remaining part of the outer tank side wall and the construction of the inner tank in parallel. The object of the present invention is to provide a method for constructing a cylindrical tank that facilitates assembly of a jack-up device and construction of a gantry for holding the jack-up device.

  The method for constructing a cylindrical tank according to the present invention is a method for constructing a cylindrical tank having a metal inner tank and a concrete outer tank, and the side wall of the outer tank extends from the lower stage side to the middle of the completed height. A step of constructing, a step of assembling an annular knuckle portion inside the side wall of the outer tub, a step of constructing the rest of the side wall of the outer tub using a suspension scaffold formed on the side wall, and A step of providing a plurality of suspended members to be connected to a jack-up device at a knuckle portion; a step of assembling a roof top scaffold that does not interfere with the side wall of the outer tub and the suspension scaffold; and a jack on the side wall of the outer tub. A plurality of suspension portions for suspending the lifting device, a step of attaching a jackup device between the suspension portion of the side wall of the outer tub and the suspended member of the knuckle portion, and the plurality of jigs. Said knuckle portion is raised by lifting with said roof scaffold by Kkiappu device, characterized in that and a step of assembling the inner tank made of metal inner tank side plate attached to the underside of the elevated the knuckle portion.

  Further, in the method for constructing the cylindrical tank, in the step of attaching the inner tank side plate to the lower side of the knuckle part and assembling the metal inner tank, a process of attaching one inner tank side plate to the lower side of the knuckle part; Between the process of attaching another inner tank side plate under the one inner tank side plate, a second hanging part for hanging the jack-up device is provided above the hanging part of the side wall of the outer tank, It is preferable to have a process of replacing the jack-up device between the second suspension part and the suspended member.

  In the method for constructing the cylindrical tank, the jack-up device includes a jack body and a jack-up rod connected to the jack body so as to be movable up and down, and the jack-up rod has a plurality of rods having a length. In the step of assembling the metal inner tub, the jack up when the knuckle portion is lifted and lifted together with the rooftop scaffold by the plurality of jack up devices in the step of assembling the metal inner tub. It is preferable to have a process of removing the rod at the upper end of the rod from the rod at the lower end side.

  Moreover, in the construction method of the cylindrical tank, it is preferable that a pivotable davit is provided on the rooftop scaffold.

  Moreover, in the construction method of the cylindrical tank, it is preferable that at least a part of the roof top scaffold is connected to the suspended member and supported by the suspended member.

  Moreover, in the construction method of the cylindrical tank, in the step of assembling the annular knuckle portion inside the side wall of 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 tub, it is preferable to attach the next inner tub side plate to the lower inner tub side plate raised by the plurality of jackup devices.

  According to the construction method of the cylindrical tank of the present invention, since the roof top scaffold that does not interfere with the side wall of the outer tub and the suspended scaffold is assembled to the knuckle portion, the jack up device is then suspended from the side wall of the outer tub. Assembling and suspending the jackup device by using the above-mentioned roof scaffolding in the process of providing a plurality of suspension parts to be used as a base for the vehicle and the process of attaching the jackup device between the suspension part and the suspended member. The construction of the part can be easily and efficiently performed.

It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is principal part side sectional drawing for demonstrating the attachment state of a knuckle support and a space keeper. It is a principal part top view for demonstrating the attachment state of a knuckle support 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 sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a figure which shows the principal part inner surface side of the side wall of an outer tank in the process shown in FIG. It is principal part sectional drawing for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side view for demonstrating the process in one Embodiment of this invention. It is a sectional side 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, the outer tank side wall (PC wall) 3 is placed from the lower stage side to the middle of the completed height (complete height). In the form, up to the fifth step (# 5) of the side wall 3 formed by stacking nine steps in total is formed. However, the height up to the middle is not limited to the fifth stage, and can be an arbitrary height (stage).

  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. Furthermore, since the side wall 3 of the remaining steps is stacked on the part of the side wall 3 to finally form the side wall 3 having nine steps, 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 placed on a part of the side wall 3 using the suspension scaffold 5 to form a sixth-stage (# 6) side wall. In constructing such a side wall 3, as the upper side is sequentially formed, the suspension scaffold 5 is sequentially assembled on the upper side, and the unnecessary lower side is sequentially removed.

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 to be assembled here corresponds to the uppermost stage of the inner tank (in this embodiment, the ninth stage [# 9]). 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 edge of the uppermost inner tank side plate 7 at the lower edge thereof. Parts are connected.

  As shown in FIGS. 4 to 6, the knuckle plate 9 is attached with a knuckle support 10 and a space keeper 11 on the outer peripheral surface thereof. In this embodiment, as shown in FIG. 6, a plurality of knuckle supports 10 (for example, 30 pieces) are provided at equal intervals along the circumferential direction of the knuckle plate 9, and one space keeper 11 is provided between them. Yes. 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.

  The knuckle support 10 is made of a steel plate to be a suspended member to be connected to a jack-up device to be described later. As shown in FIGS. 4 and 5, a pair of support plates 10 a and 10 a formed in a substantially triangular shape in side view, The suspension plate 10b having a substantially square shape in plan view sandwiched between the support plates 10a and 10a, and the support plate 10a sandwiched between the support plates 10a and 10a and connected to the upper surface side of the suspension plate 10b, It is formed by a reinforcing plate 10c that reinforces the space between 10a and the suspended plate 10b.

  As shown in FIG. 4, the support plates 10 a and 10 a have one side 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. Yes. The suspended plate 10b and the reinforcing plate 10c are attached and fixed between the support plates 10a and 10a by welding, bolting, or the like as shown in FIG. Here, the suspended plate 10b is fixed between the support plates 10a and 10a with its outer end (end on the side wall 3 side) coinciding with the outer end of the support plates 10a and 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.

  The space keeper 11 is provided on the outer peripheral surface of the knuckle plate 9 so as to protrude outwardly as shown in FIGS. 4 and 5, and is equally spaced along the circumferential direction of the knuckle plate 9 as shown in FIG. 6. The knuckle support 10 is provided between the knuckle supports 10. These space keepers 11 are disposed at substantially the center between the adjacent knuckle supports 10 and 10, and thus the space keepers 11 are also provided at equal intervals along the circumferential direction of the knuckle plate 9. Therefore, the space keeper 11 and the knuckle support 10 are alternately arranged at equal intervals along the circumferential direction of the knuckle plate 9.

  The space keeper 11 is sandwiched between a pair of steel plates (not shown) attached to the knuckle plate 9 in the same manner as the support plate 10a as shown in FIGS. 4 and 5, for example. It is formed by the H steel 11a and the steel plate 11b stuck on the outer end surface of the H steel 11a. In this embodiment, the space keeper 11 is formed and arranged with its outer end extending outward (outside the side wall 3 of the outer tub) from the outer end of the suspended plate 10b.

  That is, the space keeper 11 is formed and arranged so that the distance from the center of the knuckle plate 9 to the outer end of the space keeper 11 is longer than the distance from the center of the knuckle plate 9 to the outer end of the suspended plate 10b. By forming and arranging in this way, the space keeper 11 can reduce the substantial clearance between the side wall 3 of the outer tub and the knuckle plate 9. Therefore, when the knuckle plate 9 is lifted by a jack-up device described later, even if the knuckle plate 9 is displaced in the horizontal direction due to the influence of an earthquake or the like, the amount of displacement is reduced and the space keeper 11 collides with the side wall 3 of the outer tub. Can reduce the impact.

Next, as shown in FIG. 7, the inner tank roof block is mounted on the roof mount 8, and the inner tank roof (tank roof portion) 14 is assembled.
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.
Further, the side walls 3 of the outer tub are sequentially stacked on the upper side using the suspension scaffold 5, and the side walls 3 of the outer tub are constructed up to the ninth stage (# 9) as the final stage as shown in FIG. 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. 8, the jack is placed on the knuckle plate 9 so as not to interfere with the inner circumferential surface of the side wall 3 of the outer tub and not interfere with the suspension scaffold 5. Assemble the scaffold for the up device (rooftop scaffold) 17. 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, in the assembly, as shown in FIG. 8 and FIG. 9 which shows the inner surface side of the main part of the side wall 3 of the outer tub in the process shown in FIG. These are supported by attaching them to the knuckle support 10. And the fall prevention material (not shown) is provided between the knuckle plate 9 and the inner tank roof 14, and the scaffold 17 for jackup apparatuses is formed in the state fixed to the knuckle plate 9 and the inner tank roof 14. In the present embodiment, as shown in FIG. 8, the jack-up device scaffold 17 is assembled corresponding to approximately the fourth stage (# 4) to the fifth stage (# 5) of the side wall 3 of the outer tub.

  Then, as shown in FIGS. 8 and 9, the suspension base 18 (hanging portion) is placed on the side wall 3 at a predetermined position of the side wall 3, in this embodiment, the fifth stage (# 5), using the scaffold 17 for jack-up device. A plurality are installed so as to be equally spaced in the circumferential direction of 3. 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 jackup device 19 is attached between the suspension base 18 and the suspended plate 10b of the knuckle support 10 by using the jackup device scaffold 17. 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. Such an operation can be easily performed without any trouble by using the jack-up device scaffold 17 shown in FIG.

  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. 8, 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 interfered with the suspension scaffold 5 by removing (separating) the rod 20b protruding upward from the suspension base 18 from the lower rod 20b. Can be prevented.

In addition, the code | symbol 15 in FIG. 8 is the davit installed in the top part of this at the time of formation of the scaffold 17 for jackup apparatuses, This davit 15 was provided so that turning was possible, and it removed from the said lower rod 20b ( This is for transferring the separated rod 20b.
Further, reference numeral 21 in FIG. 8 is used to lift and suspend the constituent members of the jack-up device 19 and to suspend the rod 20b removed from the jack-up rod 20 and transferred by the davit 15. This is a suspended balance, which is a known balance structure having a weight 21b at one end of a balance bar 21a. 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 pearlite concrete blocks 23 a and 23 b and a structural lightweight concrete block 24 on the bottom cooling resistance reducing material 22 under the legged base 6. This is done by attaching the annular plate 16a. 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, whereby the knuckle plate 9 and the inner tank roof 14, the inner tank side plate 7, the knuckle support 10, the space keeper 11, The tank constituent member Y including 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.

  When the tank component Y is raised by almost one step of the inner tank side plate 7 by the jack-up device 19, 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 into 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 in this way, the jack-up device 19 has the upper end of the jack-up rod 20 protruding upward from the suspension base 18 as shown in FIG. Will be interfered with. Then, while performing the welding etc. of the inner tank side plates 7 described above, the portions of the plurality of rods 20b constituting the jackup rod 20 that protrude upward from the suspension base 18 are removed from the lower side.

  Then, the rod 20b removed using the davit 15 installed in advance on the top of the jackup device scaffold 17 is lowered onto the inner tank roof 14. That is, the removed rod 20b is lowered onto the inner tub roof 14 by the davit 15 capable of turning. A storage part (not shown) for temporarily storing materials such as the rods 20b is formed on the inner tank roof 14 in advance. Such removal of the rod 20b, suspension of the removed rod 20b on the inner tank roof 14, storage in the storage unit, and the like are performed using the jack-up 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-up device 19 raises the tank constituent member Y by almost one stage of the inner tank side plate 7 and carries the next inner tank side plate 7 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. Also at this time, the rod 20 b protruding upward from the suspension base 18 is removed and lowered onto the inner tank roof 14 using the davit 15.

  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.
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. These series of operations are also performed using the jack-up device scaffold 17.

  And the jack main body 20a of the jack-up apparatus 19 is attached to the 2nd suspension mount frame 25 shown in FIG. At this time, the jack-up rod 20 was removed from the upper side so as not to be interfered with the suspension scaffold 5 and stored in the storage unit on the inner tank roof 14. Since the side suspension scaffold 5 is removed so that the jack-up rod 20 can be extended freely, the rod 20b stored on the inner tank roof 14 is attached to the jack-up rod 20 again, and the jack-up rod 20 is lengthened. Keep it. In the present embodiment, as shown in FIG. 14, 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 separately prepared in advance is used. Add and adjust the jack-up rod 20 to the desired length. This operation can also be performed by using the jackup device scaffold 17 shown in FIG.

  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 jack-up device 19, and the tank constituent member Y is raised by almost one step of the inner tank side plate 7.
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. 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 The attachment to the tank side plate 7) is sequentially repeated, and as shown in FIG. 17, the inner tank side plate 7 is attached to the first level (# 1) at 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. Then, the tank component 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 and fixed to the attachment end 29 embedded in the top inner peripheral surface of the side wall 3 of the outer tub.
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 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.

  When constructing the cylindrical tank 100 having such a structure, since the scaffold 17 for the jack-up device (scaffold on the roof) that does not interfere with the side wall 3 of the outer tub and the suspended scaffold 5 is assembled on the knuckle plate 9, In the step of providing a plurality of suspension bases 18 for suspending the jackup device 19 on the side wall 3 of the outer tub, the step of attaching the jackup device 19 between the suspension base 18 and the knuckle support 10, etc. These constructions can be easily performed by using the lifting device scaffold 17.

  Therefore, according to the construction method of the cylindrical tank of this embodiment, in particular, a part of the outer tank side wall 3 is preceded, and then the remaining part of the outer tank side wall 3 and the inner tank are constructed in parallel. Even in such a case, the jackup device scaffold 17 (rooftop scaffold) is assembled to the knuckle plate 9 so that the jacks are not interfered with the side wall 3 of the outer tub or the suspended scaffold 5 formed on the upper side thereof. The assembly of the up device 19 and the construction of the suspension base 18 can be performed easily and efficiently. As a result, the construction period can be shortened and the cost can be reduced.

  In the process of attaching the inner tank side plate 7 to the lower side of the knuckle plate 9 and assembling the metal inner tank, a process of replacing the jackup device 19 by providing the second suspension base 25 above the suspension base 18 is performed. However, even in such processing, the jackup device 19 can be disassembled and the suspension base 18 can be removed from the side wall 3 by using the jackup device scaffold 17. Can be easily performed.

  Further, when the knuckle plate 9 is lifted and lifted together with the jackup device scaffold 17 by the jackup device 19, the upper end rod 20b of the jackup rod 20 is removed from the lower end side rod 20b. Such removal of the rod 20b and suspension of the removed rod 20b on the inner tank roof 14 can be easily performed using the jack-up device scaffold 17.

  In addition, since the pivotable davit 15 is provided on the scaffold 17 for the jack-up device, the rod 20b removed by the davit 15 is inserted into the rod 20b when the upper-end rod 20b of the jack-up rod 20 is removed from the lower-end rod 20b. It can be easily hung on the tank roof 14.

  In addition, since at least a part of the scaffold 17 for the jack-up device, in the present embodiment, substantially the whole is attached to and supported by the plurality of knuckle supports 10, the jack-up device scaffold 17 on the knuckle plate 9 is supported. The jack-up device can be easily mounted, and at the time of disassembling the jack-up device scaffold 17, the jack-up device scaffold 17 and the knuckle support 10 are mainly processed without directly treating the knuckle plate 9. The scaffold 17 can be removed from the knuckle plate 9. Therefore, it is possible to prevent the knuckle plate 9 remaining as a constituent member in the completed cylindrical tank 100 from being damaged by the disassembly of the jackup device scaffold 17.

  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 the annular assembly of the knuckle plate 9 can be facilitated.

  In particular, when an earthquake or a strong wind occurs while the tank component Y is jacked up or suspended by the jack-up device 19, the inner tank roof 14 and the outer tank roof 26 are horizontal in the outer tank. Although there is a possibility that the space keeper 11 is greatly displaced in the direction, the space keeper 11 is provided between the knuckle supports 10 and 10 so as to extend to the outside (side wall 3 side of the outer tub). The substantial clearance between the side wall 3 and the knuckle plate 9 can be reduced. Therefore, even if the knuckle plate 9 is displaced in the horizontal direction due to the influence of an earthquake or the like, the amount of displacement can be reduced, thereby reducing the impact when the space keeper 11 collides with the side wall 3 of the outer tank, Damage to the side wall 3 of the outer tub can be prevented. Further, it is possible to reliably prevent damage between the jackup device 19 and the suspended plate 10b.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 3 ... Side wall of outer tank, 5 ... Suspended scaffold, 7 ... Inner tank side plate, 9 ... Knuckle plate (knuckle part), 10 ... Knuckle support (member to be hung), 14 ... Inner tank roof, 15 ... Davit, 18 ... Hanging Base (suspending part), 17 ... scaffold for jack-up device (scaffold on roof), 19 ... jack-up device, 20 ... jack-up rod, 20b ... rod, 25 ... second suspension base (second suspension part)

Claims (6)

A construction method of a cylindrical tank having a metal inner tank and a concrete outer tank,
The process of constructing the side wall of the outer tub from the lower stage side to the middle of the completed height,
Assembling an annular knuckle portion inside the side wall of the outer tub;
Applying the remaining side wall of the outer tub using a suspension scaffold formed on the side wall;
Providing a plurality of suspended members to be connected to the jack-up device in the knuckle part;
Assembling a rooftop scaffold that does not interfere with the side wall of the outer tub and the suspension scaffold in the knuckle part;
Providing a plurality of suspension portions for suspending the jack-up device on the side wall of the outer tub;
Attaching a jack-up device between the suspended portion of the side wall of the outer tub and the suspended member of the knuckle portion;
And lifting the knuckle part together with the rooftop scaffold by the plurality of jack-up devices, and attaching an inner tank side plate to the lower side of the raised knuckle part to assemble a metal inner tank. A feature of the cylindrical tank construction method.   In the step of assembling the metal inner tank by attaching the inner tank side plate to the lower side of the knuckle part, the process of attaching one inner tank side plate to the lower side of the knuckle part and the other one below the one inner tank side plate A second suspension part for suspending the jackup device is provided above the suspension part on the side wall of the outer tank between the process of attaching the inner tank side plate, and the second suspension part and the suspended member The construction method of the cylindrical tank of Claim 1 which has the process which replaces a jackup apparatus between each. The jack-up device includes a jack body and a jack-up rod connected to the jack body so as to be movable up and down. The jack-up rod is formed by detachably connecting a plurality of rods in a length direction. And
In the step of assembling the metal inner tub, when the knuckle portion is lifted and lifted together with the roof top scaffold by the plurality of jackup devices, the upper end rod of the jackup rod is removed from the lower end rod. The method for constructing a cylindrical tank according to claim 1, wherein:   4. The method for constructing a cylindrical tank according to claim 3, wherein a davit capable of turning is provided on the roof scaffold.   The method for constructing a cylindrical tank according to any one of claims 1 to 4, wherein at least a part of the roof top scaffold is connected to the suspended member and supported by the suspended member. In the step of assembling the annular knuckle portion inside the side wall of the outer tub, the knuckle portion is assembled on the upper side of the annular inner tub side plate assembled in advance,
6. In the step of assembling the metallic inner tank, the following 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.

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