JP2015193397A - Reinforcing construction method of columnar support and/or brace for spherical tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing construction method of a columnar support and/or a brace for a spherical tank, which performs, at high work efficiency, the cut and removal of the columnar support and/or the brace, the reinforcing construction, and the connection of new members in order to enhance rigidity and strength to lateral vibration caused by an earthquake, a strong wind or the like with respect to an existing spherical tank, and to improve durability and safety.SOLUTION: In a reinforcing construction method of columnar supports 3 and/or braces 5 for an existing spherical tank 1, a plurality of pieces of the columnar supports 3 which are placed on and fixed to an external peripheral face of a spherical shell body 2 of the spherical tank 1 at prescribed intervals are fixed on a foundation 4, the braces 5 which intersect with each other in an X-shape between the adjacent columnar supports 3 are connected to each other, and the columnar supports 3 are formed of upper columnar supports 3a and lower columnar supports 3b. Intermediate parts 3b3 of the existing lower columnar supports 3b are removed, and then, new reinforcing intermediate columnar supports 3A are arranged.

Description

  The present invention relates to a construction method for reinforcing a pillar and / or brace of an existing spherical tank for storing compressed gas, liquefied gas, etc. for the purpose of improving earthquake resistance.

As shown in FIG. 12, the spherical shell 2 of the existing spherical tank 1 is supported by a support 3 and a foundation 4, and a brace 5 that is inclined and intersects in an X shape is provided between the support 3.
The brace 5 of the example of illustration has shown the case of the pipe brace of a cylindrical steel pipe.
The support column 3 includes an upper support column 3 a connected to the spherical shell 2 and a lower support column 3 b connected to the foundation 4.
In order to partially reinforce the main parts of the pillar 3 and brace 5 of such an existing spherical tank 1, a large scale scaffolding or support frame is usually installed, but not shown, and construction is performed in an arbitrary procedure. Yes.

  The invention of the prior art includes, for example, the invention of Japanese Patent Application Laid-Open No. 2011-184056 “Spherical Tank Leg Seismic Reinforcement Structure” by the present applicant. According to the present invention, a novel cylindrical support member is formed by using a split cylindrical tube on the whole or a part of the outer periphery of the support portion and the connection portion of the existing leg portion from the foundation supporting the spherical shell of the spherical tank to the spherical shell. It is disclosed to cover and integrally form by welding.

  Moreover, there exists invention of Unexamined-Japanese-Patent No. 2013-154932 "Structure of the pipe brace crossing part of a spherical tank leg part" of patent document 2 by this applicant. In this invention, an octagonal reinforcing connection plate is inserted into the center of one pipe brace at an intersection of pipe braces provided to be inclined between columns supporting a spherical shell of a spherical tank, and is fixed by welding. It is disclosed that another two-way pipe brace is inserted into the reinforcing connection plate and welded to be integrally formed.

Furthermore, there is an invention of Japanese Patent Application Laid-Open No. 2013-180780 “Brace mounting part structure of spherical tank leg” of Patent Document 3 by the present applicant. According to the present invention, the column supporting the spherical shell of the spherical tank includes a hollow lower column connected by a tie rod brace or a pipe brace inclined between the columns, and an upper end of the lower column. A brace mounting structure for a spherical tank leg is disclosed that includes an end plate that spreads in a shape, a guide plate that is provided on the back surface of the end plate and that fits into the hollow lower column, and an upper column that is joined to the surface of the end plate. Has been.

JP 2011-184056 A JP2013-154932A JP 2013-180780 A

  In order to replace and reinforce the main part of the column 3 and / or the brace 5 of the existing spherical tank 1 shown in FIG. 12, it does not become a large-scale and complicated operation for a predetermined part of the column 3 and / or the brace 5. It was desired to construct an effective reinforcing structure with good procedures.

  The invention of the conventional “legged seismic reinforcement structure of spherical tank” in Patent Document 1 is a novel cylindrical support that uses a half cylindrical tube for the whole or part of the outer circumference and the connection part of the existing leg part of the spherical tank. Although the member is covered and integrally formed by welding, it is not related to a construction method in which the main part of the support column and the brace is replaced and reinforced.

  The invention of the conventional “Pipe Brace Crossing Structure of Spherical Tank Leg” disclosed in Patent Document 2 inserts an octagonal reinforcing connecting plate at the crossing part of the pipe brace and welds it to increase rigidity to increase safety. However, it does not relate to a construction method for replacing and reinforcing the main parts of the columns and braces.

  In addition, the invention of the conventional “brace tank leg brace attachment structure” of Patent Document 3 is provided with an end plate, a guide plate, a disc rib, and a gusset plate on the support of the spherical tank, Although the strength is increased and the durability and safety are improved, it is not related to a construction method for replacing and reinforcing the main parts of the columns and braces.

The present invention has been made in view of the above-described problems of the prior art, and its object is to increase the rigidity and strength of existing spherical tanks against rolls caused by earthquakes and strong winds, thereby improving durability and safety. In order to improve performance, it is an object of the present invention to provide a method for reinforcing a strut and / or brace of a spherical tank, which efficiently cuts and removes the strut and / or brace, and reinforces and connects a new member.

  According to the first aspect of the invention, the method for reinforcing the strut of the spherical tank is to fix a plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. The intermediate portion 3b3 of the existing lower column 3b is removed, and then a new reinforcing intermediate column 3A is installed.

  In the method for reinforcing the support of the spherical tank according to the invention of claim 2, a plurality of support columns 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. The intermediate part 3b3 of the existing lower support 3b is removed, and then a reinforcing disk 6 is installed to fit into the hollow interiors of the upper brace connection part 3b1 and the lower brace connection part 3b2 that are positioned above and below, followed by a new reinforcement An intermediate strut 3A is installed.

  A method for reinforcing a brace of a spherical tank according to the invention of claim 3 is to fix a plurality of columns 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. The existing brace intersection 5c is removed, and then a new reinforcing intersection brace 5A having an octagonal gusset plate 7 is installed.

  According to the fourth aspect of the present invention, there is provided a method for reinforcing the support and / or brace of a spherical tank, in which a plurality of support pillars 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on the foundation 4. Further, the braces 5 intersecting in an X-shape are connected between adjacent struts 3, and the struts 3 are used to reinforce the struts 3 and / or braces 5 of the existing spherical tank 1 composed of the upper struts 3 a and the lower struts 3 b. In the method, first, the intermediate portion 3b3 of the existing lower column 3b is removed, and then the reinforcing disc 6 that fits into the hollow interior of each of the upper brace connection location 3b1 and the lower brace connection location 3b2 that are positioned up and down is installed. A new reinforcing intermediate strut 3A is installed, then the existing brace intersection 5c is removed, and then a new reinforcing intersection brace 5A having an octagonal gusset plate 7 is installed.

The reinforcing method of the spherical tank support and / or brace according to the invention of claim 5 is replaced when reinforcing the support 3 and / or brace 5 of the existing spherical tank 1 according to claims 1 to 4. A temporary reinforcing material 8 that supports a load is installed and installed in the vicinity of the support column 3 and / or the brace 5.

According to the first aspect of the invention, the method for reinforcing the strut of the spherical tank is to fix a plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. Since the middle part 3b3 of the existing lower column 3b is removed, and then a new reinforcing middle column 3A is installed,
The intermediate part 3b3 of the existing lower support column 3b can be cut and removed to replace it with a new reinforcing intermediate support column 3A. The spherical tank 1 rolls to the support column 3 due to an earthquake or strong wind. When a tensile force or a compressive force is applied, the lower support column 3b is prevented from being crushed, deformed, or damaged, and the spherical tank 1 having high durability is obtained.

In the method for reinforcing the support of the spherical tank according to the invention of claim 2, a plurality of support columns 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. The intermediate part 3b3 of the existing lower support 3b is removed, and then a reinforcing disk 6 is installed to fit into the hollow interiors of the upper brace connection part 3b1 and the lower brace connection part 3b2 that are positioned above and below, followed by a new reinforcement Since the intermediate support 3A is installed,
The middle part 3b3 of the existing lower support column 3b is cut and removed to replace the new reinforcing intermediate support column 3A, and the upper brace connection point 3b1 and the lower brace connection point 3b2 located above and below are hollow. Reinforcing work can be carried out by installing a reinforcing disc 6 fitted inside, and when the spherical tank 1 rolls due to an earthquake or strong wind and a tensile force or a compressive force is applied to the column 3, the lower column 3 b The spherical tank 1 is prevented from being crushed, deformed and damaged, and has a high durability.

A method for reinforcing a brace of a spherical tank according to the invention of claim 3 is to fix a plurality of columns 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval on the foundation 4 and adjacent to each other. Are connected by braces 5 that intersect in an X-shape between the supporting columns 3, and the supporting column 3 is a reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3 a and the lower supporting column 3 b. Since the existing brace intersection 5c is removed and then a new reinforcing intersection brace 5A having an octagonal gusset plate 7 is installed,
The existing brace intersection 5c can be replaced with a new brace intersection 5A with good construction efficiency and work efficiency, and the spherical tank 1 can roll due to earthquakes or strong winds, causing the brace 5 to be pulled or compressed. In this case, the new brace intersection 5A is prevented from being crushed, deformed and damaged, and the spherical tank 1 having high durability is obtained.

According to the fourth aspect of the present invention, there is provided a method for reinforcing the support and / or brace of a spherical tank, in which a plurality of support pillars 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on the foundation 4. Further, the braces 5 intersecting in an X-shape are connected between adjacent struts 3, and the struts 3 are used to reinforce the struts 3 and / or braces 5 of the existing spherical tank 1 composed of the upper struts 3 a and the lower struts 3 b. In the method, first, the intermediate portion 3b3 of the existing lower column 3b is removed, and then the reinforcing disc 6 that fits into the hollow interior of each of the upper brace connection location 3b1 and the lower brace connection location 3b2 that are positioned up and down is installed. Install the new reinforcing intermediate strut 3A, then remove the existing brace intersection 5c, and then install the new reinforcing intersection brace 5A having the octagonal gusset plate 7.
The existing support column 3 and brace 5 can be reinforced with good construction efficiency and work efficiency. When the spherical tank 1 rolls due to an earthquake or a strong wind, tensile force or compression force is applied to the support column 3 or brace 5 Further, it is possible to prevent the lower support column 3b and the new brace intersection 5A from being crushed, deformed, and damaged, and the spherical tank 1 having high durability is obtained.

The reinforcing method of the spherical tank support and / or brace according to the invention of claim 5 is replaced when reinforcing the support 3 and / or brace 5 of the existing spherical tank 1 according to claims 1 to 4. Since the temporary reinforcing material 8 that supports the load is installed and installed in the vicinity of the column 3 and / or the brace 5,
The load applied to the support column 3 and / or the brace 5 from the spherical tank 1 is received by the temporary reinforcing material 8, and the existing support column 1 and / or the brace 5 can be reinforced and constructed safely with a good construction procedure.

It is a spherical tank front view for demonstrating the reinforcement construction method of the support | pillar and / or brace of a spherical tank which concern on this invention. It is explanatory drawing which shows the support structure of a spherical tank, and the reinforcement structure of a brace. It is a figure which shows the 1st step of the construction procedure of the example which replaces and reinforces the lower support | pillar and brace crossing part which are the principal parts of the existing spherical tank and brace. It is a figure which shows a 2nd step. It is a figure which shows a 3rd step. It is a figure which shows a 4th step. It is a figure which shows a 5th step. It is a figure which shows a 6th step. It is a figure which shows the condition of the reinforcement construction of the support | pillar and brace of an existing spherical tank. It is a figure which shows a reinforcement disc. It is a figure which shows a reinforcement brace crossing part. It is a figure which shows the spherical tank provided with the conventional general pipe brace.

An embodiment of a method for reinforcing a spherical tank column and / or brace according to the present invention will be described with reference to FIGS.
The same reference numerals are used for the same terms throughout FIGS. 1 to 11, and a part of the description of each reference is omitted.
The present invention is not limited only to the following embodiments, and modifications (for example, omission or addition of components, changes in shape of components, etc.) are made to the following embodiments without departing from the gist of the present invention. Of course you can.

FIG. 1 is a front explanatory view showing the structure of a spherical tank constructed by reinforcing the struts and braces of a spherical tank. A spherical shell (spherical shell plate) 2 is supported on a foundation 4 by a plurality of struts 3. The braces 5 are connected to each other by braces 5 which are inclined between the columns 3 and arranged in an X shape. The brace 5 shows the case of a pipe brace of a cylindrical steel pipe.
The support column 3 includes an upper support column 3 a connected to the spherical shell 2 and a lower support column 3 b to which the brace 5 is fixed.
At the part indicated by the mesh line in the figure where the spherical tank rolls due to an earthquake or strong wind and the tensile force and compressive force are applied to the column and brace, the reinforcing intermediate column 3A with improved durability is provided in the middle part of the lower column 3b. The case where the reinforcement cross brace 5A which provided and improved durability in the cross part of the brace 5 is shown is shown.

FIG. 2 shows an enlarged view of the lower strut 3b and brace 5 reinforcement portion of FIG.
3A is a reinforcing intermediate strut located in the middle portion of the lower strut 3b, and 6 is a reinforcing disc provided in the cylindrical hollow interior of each of the upper and lower portions. This reinforcing disk 6 acts as a diaphragm-like partitioning plate, disperses the tensile force and compressive force, and at the connecting part of the brace 5 in order to obtain the necessary strength without crushing, deforming or damaging the cylindrical part. It is provided inside the upper end portion and the lower end portion of the positioned reinforcing intermediate column 3A.
5A is a reinforcing cross brace located at the X-shaped crossing of the brace 5, and 7 is a gusset plate for reinforcing the crossing. The gusset plate 7 is installed so that the plate thickness and dimensions are selected so as to obtain the required strength and the intersections of the pipes are connected and integrated.

  Thus, by providing the reinforcing intermediate strut 3A and the reinforcing disc 6 on the lower strut 3b which may be damaged by an earthquake or strong wind among the struts 3 of the spherical tank 1, the strut rigidity is improved and the strength is increased. There is no deformation or damage. Further, by providing the reinforcing cross brace 5A having the gusset plate 7 at the crossing portion of the brace 5, it is possible to prevent deformation and damage and to obtain a brace structure having high strength.

FIG. 3 to FIG. 9 show the construction procedure of an example in which the lower strut, which is the main part of the strut and brace in the existing spherical tank, and the brace intersection located on the left and right are replaced and reinforced.
FIG. 3 is a diagram showing the first step.
With respect to the existing lower strut 3b to be replaced and reinforced, the upper brace connection location 3b1 and the lower brace connection location 3b2 which are the connection locations of the brace 5 are left and cut at positions 3x above and below, and the cut intermediate strut 3b3 is removed. In this construction, a temporary reinforcing member that receives a load provided as necessary is not shown.

FIG. 4 is a diagram illustrating the second step.
Subsequently, the reinforcing disk 6 is inserted into the hollow interior of the upper brace connection point 3b1 and the lower brace connection point 3b2 from the cut upper and lower 3x positions, and the periphery is welded.
Thus, by providing the reinforcing disk 6 in the hollow interior of the upper brace connection part 3b1 and the lower brace connection part 3b2, the tensile force and the compressive force applied to the vicinity of the connection part of the brace 5 are caused by the diaphragm-like reinforcing disk 6. Since it is dispersed, it is prevented from being crushed, deformed, and damaged, and has a high strength attachment structure.

FIG. 5 is a diagram showing a third step.
Next, a new reinforcing intermediate strut 3A with increased strength is welded and installed at the cut upper and lower 3x positions.
Thus, by installing the new reinforcing intermediate strut 3A, the durability strength of the entire strut can be improved.

FIG. 6 is a diagram showing a fourth step.
The temporary reinforcing material 8 is installed over the brace 5 so as to surround the cut portion 5x in the brace intersection 5c to be replaced and strengthened. The example of the reinforcing material 8 shows a case where the brace 5 is fixed and stabilized by a frame body during construction work, but is installed by raising it from the ground to support the load of the brace 5. Also good.

FIG. 7 is a diagram showing a fifth step.
Subsequently, the brace intersection 5c is cut at the cutting portion 5x and removed. Cut and remove the adjacent brace intersection 5c.

FIG. 8 is a diagram showing a sixth step.
Next, a new reinforcing brace intersection 5A having a gusset plate 7 is applied to the removed portion 5d and fixed by welding. Sequentially, the adjacent new reinforcing brace intersection 5A is constructed.

FIG. 9 shows the situation where the existing spherical tank struts and braces are replaced and reinforced.
As shown in the construction procedure from the first step to the sixth step, the construction work of the new reinforcing intermediate brace 3A, the reinforcing disc 6 and the new reinforcing cross brace 5A with the gusset plate material 7 is the lower strut of the existing spherical tank. With respect to 3b, it is possible to perform replacement and reinforcement construction sequentially in the circumferential direction or continuously over the symmetrical position with good workability.

FIGS. 10A and 10B are diagrams showing examples of the reinforcing disc 6, where FIG. 10A shows the case where the reinforcing plate 6 is formed on the flat plate 10, and FIG. 10B shows the case where the cross plate 10 is formed with the cross-shaped guide plate 11.
Such a reinforcing disk 6 is inserted into the cylinders of the upper brace connection portion and the lower brace connection portion of the lower support column, and is fitted and fixed by welding the outer peripheral edge of the flat plate 10.
Since the tensile force and the compressive force are dispersed by the diaphragm-like reinforcing disc 6 as described above, the lower support column is prevented from being crushed, deformed, and damaged, and a high-strength support column is obtained.

FIG. 11 is a diagram showing a new reinforcing cross brace 5A.
Reference numeral 7 denotes an octagonal gusset plate, which shows a case where it is welded and fixed by penetrating through the intersection of braces of a cylindrical steel pipe.
By attaching the reinforcing cross brace 5A in this way, the strength against bending load, tensile load and compression load is improved. In addition, the reinforcing cross brace 5A having the gusset plate 7 can be appropriately manufactured by previously integrating and inspecting by welding at a factory.

The method of reinforcing the strut and / or brace of the spherical tank according to the present invention is applied to improve the seismic resistance of the existing spherical tank, but the reinforcing structure of this strut and brace is the seismic resistance of the new spherical tank. It can also be applied to improve.

1 Spherical tank
2 spherical shell
3 props
3a Upper support
3b Lower column
3b1 Upper brace connection point
3b2 Lower brace connection point
3b3 middle part
3A Reinforced intermediate strut 4 Foundation
5 braces
5c Brace intersection 5A Reinforced intersection brace
6 Reinforcement disk
7 Gusset board
8 Reinforcing material

Claims (5)

  A plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on a foundation 4 and connected by braces 5 intersecting in an X shape between adjacent struts 3. In the reinforcing method of the supporting column 3 of the existing spherical tank 1 and / or the brace 5 composed of the upper supporting column 3a and the lower supporting column 3b, the supporting column 3 is removed from the intermediate portion 3b3 of the existing lower supporting column 3b, A reinforcing construction method for a column of an existing spherical tank, characterized by installing a reinforcing intermediate column 3A.   A plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on a foundation 4 and connected by braces 5 intersecting in an X shape between adjacent struts 3. In the reinforcing method of the supporting column 3 and / or brace 5 of the existing spherical tank 1 composed of the upper supporting column 3a and the lower supporting column 3b, the supporting column 3 is removed from the intermediate portion 3b3 of the existing lower supporting column 3b and then positioned vertically. An existing spherical tank column characterized in that a reinforcing disk 6 fitted into the hollow interior of each of the upper brace connection point 3b1 and the lower brace connection point 3b2 is installed, and then a new reinforcing intermediate column 3A is installed. Reinforcement construction method.   A plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on a foundation 4 and connected by braces 5 intersecting in an X shape between adjacent struts 3. In the reinforcing method of the support 3 and / or the brace 5 of the existing spherical tank 1 composed of the upper support 3a and the lower support 3b, the support 3 is removed from the existing brace intersection 5c, and then the octagonal gusset plate 7 A method for reinforcing a brace of an existing spherical tank, characterized by installing a new reinforcing cross brace 5A having   A plurality of struts 3 fixed on the outer peripheral surface of the spherical shell 2 of the spherical tank 1 at a predetermined interval are fixed on a foundation 4 and connected by braces 5 intersecting in an X shape between adjacent struts 3. In the reinforcing method of the existing spherical tank 1 supporting column 3 and / or the brace 5 consisting of the upper supporting column 3a and the lower supporting column 3b, the supporting column 3 is first removed from the middle portion 3b3 of the existing lower supporting column 3b, and then up and down. Reinforcing discs 6 that fit into the hollow interiors of the upper brace connection point 3b1 and the lower brace connection point 3b2 that are positioned are installed, then a new reinforcing intermediate strut 3A is installed, and then the existing brace intersection 5c is installed. A method for reinforcing a brace of an existing spherical tank and / or brace, which is removed and then a new reinforcing cross brace 5A having an octagonal gusset plate 7 is installed. When reinforcing the support 3 and / or brace 5 of the existing spherical tank 1, install a temporary reinforcing material 8 that supports the load at a position near the support 3 and / or brace 5 to be replaced. A method for reinforcing a support and / or brace of a spherical tank according to claim 1.

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