JP3709902B2 - Tank jack-up method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a jack-up method for a tank used for replacing a bottom plate of an existing tank or correcting a foundation.
[0002]
[Prior art]
A flat-bottomed cylindrical tank for storing oil, etc., when correcting the foundation of the tank or replacing a corroded bottom plate, cut off the joint between the side plate and the existing bottom plate, near the lower periphery of the side plate or the inner periphery of the side plate. Lift the side plate with a jack installed near the bottom, remove the existing bottom plate, modify the foundation, install a new bottom plate, lower the side plate lifted with the jack onto the new bottom plate, It is constructed by the so-called jack-up method.
[0003]
A conventional example of the jackup method will be described in more detail with reference to FIG. 4. A jackup bracket 54 is welded to the lower outer surface of the side plate 52 of the tank 51. Then, a longitudinal reinforcing member 57 made of a grooved steel, an H-shaped steel, or the like is inserted through a horse 55 of a gate-shaped plate-shaped jig welded to the lower inner surface of the side plate 52 and a rectangular taper pin-shaped gold arrow 56, It is fixed to the inner surface of the back surface of the side plate 52 to which the bracket 54 is attached, and is supported by a grooved steel or H-shape through an L-shaped jig support 58 and a rectangular taper pin-shaped gold arrow 56 welded to the lower inner surface of the side plate 52. A circumferential reinforcing member 59 made of steel or the like is fixed in a ring shape to the lower inner surface of the side plate 52 to suppress side plate deformation at the time of jack-up, and then the joint between the side plate 52 of the tank 51 and the existing bottom plate 53 is formed. Separate. Next, the construction is performed by pushing up the bracket 54 with the jack 61 installed by cutting out the foundation 60 outside the tank 51 and lifting the side plate 52.
[0004]
As a jack-up method that does not weld the jig of the jack-up bracket to the side plate, install a jack with a claw that engages the window hole established at the bottom of the side plate, lift the side plate, and perform construction such as replacing the bottom plate Then, there is an invention of Japanese Patent Publication No. 2-5222 of a construction method in which the lower end of the side plate corresponding to the height of the window hole is cut and removed, and the lowered side plate is further lowered by the piece method. There is also an invention of Japanese Patent Laid-Open No. 63-297899 filed by the applicant of the present application of a construction method in which a jack is installed directly below the opened side plate and the side plate is lifted and lowered from directly below in a well-balanced manner.
[0005]
[Problems to be solved by the invention]
In the conventional jack-up method as shown in FIG. 4, the jack is installed on the bracket welded to the lower side plate on either the outer peripheral surface or the inner peripheral surface of the side plate and pushed up. Therefore, it is necessary to attach a large number of reinforcing materials such as a longitudinal reinforcing material and a circumferential reinforcing material in order to prevent the deformation. Furthermore, in order to weld a large number of jigs such as jack-up brackets, horses for fixing longitudinal reinforcing materials, or L-shaped jig support for fixing circumferential reinforcing materials to the side plates, There are problems such as complicated installation and removal work, which takes time and labor, and damages the side plate by welding many jigs.
[0006]
Moreover, although the invention described in Japanese Patent Publication No. 2-5222 is a construction method that does not require welding a jig for a jack-up bracket to the side plate, the side plate for the height of the window hole that engages the jack with a pawl. Since the height is lowered after the construction work, the connection in the height direction of the pipes connected to the tank must be corrected after the construction work, and there is a problem that the storage amount is reduced by the lowered side plate height. In addition, since a jack with a claw is installed on one side of the side plate and the side plate is lifted by engaging with the window hole, it is necessary to install a reinforcing material for preventing deformation on the side plate where the rotational moment is generated, and a rotational moment is generated in the side plate. It is necessary to firmly fix the jack so that it does not occur, or there is a problem that the lower end portion of the side plate provided with the window hole is damaged by the claws of the engaging jack.
[0007]
Further, the invention of Japanese Patent Laid-Open No. 63-297899 is a construction method in which the side plate is lifted and lowered from right below in a well-balanced manner so that a rotational moment is not generated in the side plate by a jack that is opened directly below the side plate. Although it is a construction method that does not require the installation of a reinforcing material such as a longitudinal reinforcing material or a circumferential reinforcing material for preventing deformation, problems such as damage to the side plate due to opening, restoration work of the opened side plate part and inspection work of the restored part, etc. There were problems such as time-consuming work.
[0008]
The present invention has been made in view of the above-mentioned problems, and it is not necessary to attach a reinforcing material such as a longitudinal reinforcing material or a circumferential reinforcing material for preventing deformation of the side plate to the side plate. Tanks that do not require welding to the side plates, and do not need to be opened by cutting the side plates to engage the jacks, solve the side plate damage problems associated with welding and cutting, reduce the work period, and allow safe construction The jack-up method is provided.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the jack-up method of the tank according to the present invention is provided with an opening portion that cuts out an existing bottom plate connected to the lower end portion of the side plate of the tank and penetrates the inside and outside of the tank, and the side plate at the opening portion. Install a jackup bracket that has a U-shaped cross section so that the lower end is wrapped and sandwiched from both sides, and a horizontal ridge extending inside and outside the tank across the side plate from both ends of the U-shape. The jack that engages with is installed on the inside and outside of the tank with the side plate in between.
[0010]
Then, the side plate together with the bracket that is mounted with the side plate placed on top so that the lower end of the side plate of the eave is standing from below is lifted from both sides by jacks inside and outside the tank so as not to generate a rotational moment on the side plate. It is designed to be lowered.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the illustrated embodiment. 1 and 2 show an example of a jack-up method for a tank according to the present invention, and FIG. 3 shows another example of a method for lowering a lifted side plate. In the figure, 1 is a tank, 2 is its side plate, 3F is an existing bottom plate, and 4 is a foundation. Reference numeral 5 denotes an opening provided by cutting out an existing bottom plate 3F connected to the lower end of the side plate 2.
[0012]
The opening 5 is obtained by scooping the upper surface of the foundation 4 supporting the existing bottom plate 3F below the side plate 2 and cutting and removing the joint between the side plate 2 and the existing bottom plate 3F by arc air gouging or the like. The existing bottom plate 3 </ b> F connected to the section is cut into a rectangle having a size for installing a jack-up bracket 6, which will be described later, by gas cutting or the like, and formed into a shape penetrating the inside and outside of the tank 1.
[0013]
As shown in FIGS. 1 and 2, the opening 5 has a U-shaped cross section so that the lower end of the side plate 2 is wrapped from both sides, and the inside and outside of the tank 1 with the side plate 2 sandwiched from both ends of the U-shaped cross section. A bracket 6 for jack-up made of steel or the like is arranged in a shape in which horizontal flanges 6E and 6E are respectively extended. On both side wall portions of the U-shaped section of the bracket 6, there are provided push bolts 6B and 6B for sandwiching and fixing the vicinity of the lower end portion of the side plate 2 wrapped and sandwiched from both sides.
[0014]
The bracket 6 abuts the bottom surface of the side plate 2 with an inner bottom surface having a U-shaped cross section, sandwiches both side surfaces near the bottom end of the side plate 2 with push bolts 6B and 6B, and between the upper end portion of the bracket 6 and the side plate 2. A rectangular taper pin-shaped gold arrow 7B, 7B is inserted into the side plate 2 and firmly fixed thereto.
[0015]
The head ends of the jacks 8 and 8 are brought into contact with the lower surfaces of the flanges 6E and 6E of the bracket 6 whose inner bottom is in contact with the lower end of the side plate 2, and the foundation 4 on the existing bottom plate 3F inside the tank 1 and outside the tank 1 The brackets 6E and 6E of the brackets are pushed up by the jacks 8 and 8 placed on the upper side, and the side plate 2 together with the bracket 6 mounted with the side plate 2 placed on top so that the lower end portion of the side plate 2 of the eaves is erected from below. Is formed so that it can be lifted with good balance by jacks 8 and 8 installed inside and outside the tank 1 from both sides so as not to generate a rotational moment in the side plate 2. The jack 8 installed inside and outside the tank 1 can easily lift the side plate 2 in a well-balanced manner by using the interlocking jack 8 in which the inside and outside head amounts are balanced and interlocked.
[0016]
The bracket 6 has a U-shaped cross section and is formed in a shape in which horizontal flanges 6E and 6E extend from both ends of the U-shape to the inside and outside of the tank 1, so The amount taken can be reduced and easily disposed on the lower end of the side plate 2. Furthermore, the jack 8 in the tank 1 is merely placed on the existing bottom plate 3F, and can be easily engaged with the flange 6E extending from the end of the U-shaped section without installing a special mount or the like. The jack 8 outside the tank 1 can also be placed on a simple base placed on the surface of the foundation 4 with a level, and the end of the U-shaped section can be easily removed without cutting the foundation 4 greatly. Since it can be engaged with the eaves 6E extending from the portion, it is easy and simple to install them.
[0017]
As described above, the brackets 6, 6... And the jacks 8, 8... Are sequentially installed along the circumferential direction of the side plate 2, and then the joint between the side plate 2 and the existing bottom plate 3 F is cut off. The side plate 2 is lifted up to make it easy to construct a new bottom plate 3N to be pulled out and arranged as a cut out existing bottom plate 3F. Then, the existing bottom plate 3F is cut and carried out of the tank 1 and removed, the foundation 4 is corrected as necessary, and a new bottom plate 3N is disposed. The lower end portion of the side plate 2 joined to the new bottom plate 3N is finished with a grinder or the like to form a weld groove.
[0018]
After these operations are finished, the side plate 2 lifted by the jacks 8, 8... Is lowered onto the new bottom plate 3N, but when the side plate 2 is lowered, the lower inner surface of the side plate 2 as shown in FIG. The side part of the support piece 9 that supports the side plate 2 is welded to the side plate 2, and when the side plate 2 is lowered, a rectangular taper pin-shaped gold arrow 7S that engages with the support piece 9 is disposed on the new bottom plate 3N, and the side plate that is lowered In order to guide 2, a guide piece 10 is attached by welding a lower end portion onto a new bottom plate 3 </ b> N positioned outside the side plate 2.
[0019]
The support piece 9 is formed of a rectangular steel plate in which a height corresponding to the height at which the side plate 2 is lowered by the engaging gold arrow 7S is cut into a rectangle, and the guide piece 10 is a joint between the side plate 2 and the new bottom plate 3N. It forms in the shape like FIG. 3 which cut off one corner of the rectangular steel plate so that welding is possible.
[0020]
The side plate 2 lifted by the jacks 8, 8... Is lowered with the guide pieces 10, 10... As the guides by the jacks 8, 8. 7S... And the support pieces 9, 9... Are engaged to support the lowered side plate 2.
[0021]
Thus, in the state which supported the side plate 2 with the gold arrow 7S and the support piece 9 engaged with the gold arrow 7S, the push bolts 6B and 6B are loosened, and the gold arrow inserted between the upper end portion of the bracket 6 and the side plate 2 7B and 7B are removed, and the bracket 6, the jack 8, the existing bottom plate 3F, etc. are removed. Then, after the foundation 4 such as the place where the bracket 6 and the jack 8 are removed is corrected and the new bottom plate 3N is arranged, the rectangular taper pin-shaped gold arrows 7S, 7S,. The side plate 2 is lowered onto the new bottom plate 3N. This series of operations is sequentially performed along the circumferential direction of the side plate 2, and the lowered side plate 2 and the new bottom plate 3N are welded and joined.
[0022]
In the above example in which the side plate 2 is lowered by the gold arrow 7S and the support piece 9 engaged with the gold arrow 7S, the side plate 2 is sequentially lowered onto the new bottom plate 3N along the circumferential direction of the side plate 2 in the series of operations described above. Although the so-called partial jack-up method is shown, the combination of the jack 8 and the bracket 6 that engages with the jack 8 and the combination of the support piece 9 and the metal arrow 7S that engages with the support piece 9 are arranged in the circumferential direction of the side plate 2. In a state where the side plate 2 is supported by the gold arrows 7S and the support pieces 9 that engage with the gold arrows 7S, the bracket 6 and the jack 8, the existing bottom plate 3F, etc. are removed. The base 4 where the bracket 6 and the like are removed is corrected, and a new bottom plate 3N is disposed, and the rectangular taper pin-shaped gold arrows 7S, 7S,. Drops once side plate 2 as a whole that lifted on the new bottom plate 3N, may be applied by a so-called whole jack-up method.
[0023]
In the above construction method example, the support piece 9 and the gold arrow 7S engaged with the support piece 9 are used to lower the side plate 2 that has been lifted, so-called wedge construction method is shown in FIG. As described above, one end of the L shape is welded to the lower portion of the side plate 2 and the lower end of the other end of the L shape is in contact with the protective plate 11 placed on the new bottom plate 3N so as to support the side plate 2. The side plate supporting piece 12 of the formed L-shaped steel plate is attached, and the descending side plate 2 guide guide piece 10 is welded to the new bottom plate 3N at the outer side of the side plate 2 and the side plate 2 is supported by the side plate supporting piece 12 Then, after the jack 8 and the bracket 6 are removed, and the foundation 4 such as the place where the bracket 6 and the jack 8 are removed is corrected and the new bottom plate 3N is disposed, the lower end portion of the side plate support piece 12 In gas cutting, etc. are cut slightly, method for lowering the side plate 2 on the new bottom plate 3N, employs a so-called piece method, it may be construction by lowering the side plate 2 that has been lifted.
[0024]
In addition, when the above-mentioned wedge construction method is adopted, there is an advantage that welding deformation of the new bottom plate 3N can be suppressed by the support piece 9 welded to the side plate 2 when the side plate 2 and the new bottom plate 3N are joined and welded. When the above piece method is adopted, there is an advantage that the side plate 2 can be smoothly lowered by adjusting the gas cutting amount of the side plate support piece 12.
[0025]
Further, the support piece 9 used in the wedge method and the side plate support piece 12 used in the piece method are both attached to the lower inner surface of the side plate 2 by welding, but the welding area is that of the strong side plate welding of the conventional jackup bracket. Thus, the support piece 9 or the side plate is not required to be welded with a welding area with a small degree of welding of a plate-shaped jig for preventing welding deformation, which is conventionally used when welding the side plate 2 and the new bottom plate 3N. The influence of the welding damage of the side plate 2 due to the welding of the support piece 12 is small. In the wedge method using the support piece 9 as a welding deformation prevention jig, the welding damage of the side plate 2 applied by welding hardly occurs.
[0026]
In addition, the bracket 6 shown in the above-described embodiment has a U-shaped cross section, and has strong horizontal rods 6E and 6E extending from both ends of the U-shaped cross section to the inside and outside of the tank 1 with the side plate 2 interposed therebetween. For example, it is divided at the bottom center of the U-shaped section or the rising part of the U-shaped section, and connected by fitting connection or screwing connection of bolts. If the structure is separable inside and outside the tank 1, the bracket 6 can be easily disposed and removed.
[0027]
【The invention's effect】
As described above, the jack-up method of the tank according to the present invention is such that a jack-up bracket is installed in an opening provided in an existing bottom plate connected to a lower side of the side plate of the tank, and the lower end of the side plate of the eaves in a standing state The side plate is mounted with the side plate placed on the side so that it is crushed from the bottom, and the side plate of the jack is lifted and lowered in a balanced manner by pushing up both ends of the bracket from both sides with jacks installed inside and outside the tank. Rotation moment does not occur and there is no need to attach a reinforcing material such as a longitudinal reinforcing material or a circumferential reinforcing material for preventing side plate deformation to the side plate.
[0028]
In addition, the jack-up bracket is mounted in an independent shape that can be easily separated by placing the side plate on top so that the lower end of the side plate is squeezed from below without being firmly welded to the side plate, and to engage the jack Since the side plate is not cut and opened, the side plate is not damaged by welding the bracket or cutting the side plate opening.
[0029]
Therefore, since there are no steps such as attaching reinforcing materials, welding jack-up brackets, cutting side plate openings, etc., construction work is easy and inspection work etc. are few, so the construction period is greatly shortened and construction is safe. be able to.
[0030]
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view showing a simplified example of a jack-up method according to the present invention, partially omitted.
FIG. 2 is a perspective explanatory view showing a simplified jack-down situation of the jack-up method example of FIG.
FIG. 3 is a longitudinal sectional side view showing another method for lowering the lifted side plate.
FIG. 4 is a longitudinal side view illustrating a conventional jackup method.
[Explanation of symbols]
1 Tank 2 Side plate 3F Existing bottom plate 3N New bottom plate 4 Base 5 Opening 6 Bracket 6E 孔 6B Push bolt 7B, 7E Gold arrow 8 Jack 9 Support piece 10 Guide piece 11 Protection plate 12 Side plate support piece

Claims (1)

An existing bottom plate connected to the lower end of the side plate of the tank is cut out to provide an opening that penetrates the inside and outside of the tank. The opening has a U-shaped cross section so as to wrap and sandwich the lower end of the side plate from both sides. Install a jackup bracket formed by extending a horizontal hook inside and outside the tank across the side plate from both ends, and install a jack that engages the hook of the bracket inside and outside the tank across the side plate. A jack-up method for tanks.

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