JP6057274B2 - Brace mounting structure for spherical tank legs - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace mounting structure for a spherical tank leg that has improved durability and safety against earthquakes for a spherical tank that stores compressed gas, liquefied gas, and the like.

  As shown in FIG. 9, a spherical shell 2 of a conventional general spherical tank 1 is vertically supported by a support 3 and a base 4 and is inclined between the supports 3 and 3 to form a tie rod brace made of a steel bar. 51 is provided.

  FIG. 10 shows a structure in which a pipe brace 52 formed of a steel pipe material inclined and crossed is provided between support columns 3 and 3 that support a spherical shell 2 of a spherical tank 1.

  Regarding the tie rod brace made of steel bar material, the invention of the prior art in which the earthquake resistance is improved is, for example, the invention of Japanese Patent Application Laid-Open No. 09-156688 “Spherical Tank Support Structure” of Patent Document 1. According to the present invention, an annular strip that is in contact with the support leg along a virtual circle is installed inside a plurality of support legs that support the spherical tank, and the strip is fixed to the support leg.

In addition, regarding a pipe brace made of a steel pipe material, Japanese Patent Application Laid-Open No. 2011-2011, filed by the applicant of the present application, discloses an invention of a related art relating to reinforcement modification of an existing spherical tank with improved durability and earthquake resistance due to earthquakes and strong winds. There is an invention of "legged seismic reinforcement structure for spherical tank" in Japanese Patent No. 184056. In the present invention, a supporting portion and a brace of an existing spherical tank are covered with a half cylindrical tube member and integrally formed by welding.

Japanese Patent Laid-Open No. 09-156688 JP 2011-184056 A

  As shown in FIGS. 11A and 11B, the conventional tie rod brace 51 shown in FIG. 9 is attached to the support column 3 of the conventional tie rod brace 51 when the spherical tank is swung. It has a structure in which tensile force acts to produce tension and deflection in each. Therefore, when the load of this tensile force is applied to the gusset plate 51a of the support column 3 attachment portion, as shown by the two-dot chain line portion K, the support column 3 made of a hollow body may be cracked and damaged.

  Further, as shown in FIG. 12, in the case of the pipe brace 52 shown in FIG. 10, the weld attachment portion to the support column 3 is indicated by an arrow when the spherical tank is swung by an earthquake or strong wind. Since the tensile force and the compressive force are repeatedly applied locally, there is a concern that cracks and deformations may occur in the vicinity of the supporting column 3 made of a hollow body and the welded mounting portion as shown by a two-dot chain line portion K. there were.

  In the invention of Japanese Patent Application Laid-Open No. 09-156688 “Spherical Tank Support Structure” of the conventional Patent Document 1, an annular strip is installed inside a plurality of support legs provided with tie rod braces made of steel bars. Although reinforced, it did not protect the tie rod brace attachment.

The invention of the prior art of Patent Document 2 JP 2011-184056 discloses "legs seismic reinforcement structure of spherical tank" is attached to the spherical-shaped tank having a pipe braces made of steel pipe, the durability by such as earthquakes and strong winds Although it was a reinforcement modification that improved the performance and earthquake resistance, it was a structure that reinforces the entire support and brace.

The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide rigidity and strength of the brace attachment portion to the support column against rolling due to an earthquake or strong wind. An object of the present invention is to provide a brace mounting structure for a spherical tank leg that is enhanced and further improved in durability and safety.

The brace mounting structure for the spherical tank leg according to the invention of claim 1 is a structure of a leg for supporting the spherical shell of the spherical tank by a column, and is a hollow lower column connected by braces inclined between the columns. An end plate extending in a bowl shape so as to close the upper end of the lower column, a guide plate fitted on the back surface of the end plate and fitted to the hollow lower column, and joined to the upper surface of the end plate The brace provided with the above-mentioned upper strut and inclined between the struts is a tie rod brace or a pipe brace.

According to a second aspect of the present invention, the brace mounting structure of the spherical tank leg is a tie rod brace according to the first aspect, and an upper gusset plate that engages with the upper portion of the tie rod brace is provided at the lower end of the upper column. The structure is such that the back surface of the end plate and the upper side surface of the lower column are welded to each other, and the reinforcing column rib is provided inside the hollow of the lower column corresponding to the welding range of the upper gusset plate. To do.

According to a third aspect of the present invention, the brace mounting structure of the spherical tank leg portion is a pipe brace according to the first aspect, and is welded symmetrically at the upper and lower portions of the lower support column of the pipe brace. The structure is such that the vicinity of the part is held by the left and right brackets, and a reinforcing disc rib is provided inside the hollow of the lower support column corresponding to the welding range where the ends of each pipe brace are welded. It is characterized by.

According to a fourth aspect of the present invention, there is provided a brace mounting structure for a spherical tank leg portion, wherein the brace according to the first aspect is a pipe brace provided to be symmetrically inclined with the hollow lower strut sandwiched therebetween, wherein the lower end of the upper strut The upper gusset plate and the lower gusset plate are welded between the end plate and the lower column side and between the lower column lower end and the lower column side, respectively, and are attached to the upper gusset plate and the lower gusset plate, respectively. The pipe brace has an insertion groove opened at the center, the upper and lower gusset plates are inserted into the insertion groove of the pipe brace, and the leading edge is welded to the side surface of the lower column, and the insertion part In addition, the outer periphery of each of the pipe braces is welded, and the hollow interior of the lower strut in the pipe brace mounting range is supplemented respectively. Characterized in that it is a structure with use disc ribs.

The brace mounting structure for the spherical tank leg according to the invention of claim 1 is a structure of a leg for supporting the spherical shell of the spherical tank by a column, and is a hollow lower column connected by braces inclined between the columns. An end plate extending in a bowl shape so as to close the upper end of the lower column, a guide plate fitted on the back surface of the end plate and fitted to the hollow lower column, and joined to the upper surface of the end plate Since the braces provided with the upper struts and inclined between the struts are tie rod braces or pipe braces,
A structure that reinforces the vicinity of the mounting part of the hollow lower column with the end plate and guide plate when the spherical tank rolls due to an earthquake or strong wind, and a tensile force or compressive force is applied to the tie rod brace or pipe brace. Therefore, the vicinity of the attachment portion of the hollow lower support column is prevented from being crushed, deformed or damaged, and a brace attachment portion structure having high strength can be obtained.

According to a second aspect of the present invention, the brace mounting structure of the spherical tank leg is a tie rod brace according to the first aspect, and an upper gusset plate that engages with the upper portion of the tie rod brace is provided at the lower end of the upper column. Since it is a structure welded to each of the back surface of the end plate and the upper side surface of the lower column, and a structure including a reinforcing disc rib inside the hollow of the lower column corresponding to the welding range of the upper gusset plate,
When a spherical tank rolls due to an earthquake or strong wind, and a tensile force is applied to the tie rod brace, the upper gusset plate connected to the end plate and lower strut is welded at a long distance from the upper side to the side. Therefore, the welded part with the hollow lower column and its vicinity are not damaged, and the load applied to the upper gusset plate mounting range is supported by the reinforcing disc rib provided inside the lower column. It is possible to prevent the lower support column from being crushed, deformed or damaged, and to obtain a brace attachment structure with high strength.

According to a third aspect of the present invention, the brace mounting structure of the spherical tank leg portion is a pipe brace according to the first aspect, and is welded symmetrically at the upper and lower portions of the lower support column of the pipe brace. Since the structure is such that the vicinity of the part is held by the left and right brackets, and a reinforcing disc rib is provided in the hollow interior of the lower column corresponding to the welding range where the ends of each pipe brace are welded ,
When a spherical tank rolls due to an earthquake or strong wind, and a tensile force and compressive force are applied to the pipe brace, it is relaxed and supported by the bracket connected to the lower strut, and the tension and compression applied near the pipe brace mounting part Since the load is a structure that is supported by the reinforcing disc rib provided inside the hollow of the lower support column, the hollow lower support column is prevented from being crushed, deformed or damaged, and a high-strength brace attachment structure can be obtained. .

According to a fourth aspect of the present invention, there is provided a brace mounting structure for a spherical tank leg portion, wherein the brace according to the first aspect is a pipe brace provided to be symmetrically inclined with the hollow lower strut sandwiched therebetween, wherein the lower end of the upper strut The upper gusset plate and the lower gusset plate are welded between the end plate and the lower column side and between the lower column lower end and the lower column side, respectively, and are attached to the upper gusset plate and the lower gusset plate, respectively. The pipe brace has an insertion groove opened at the center, the upper and lower gusset plates are inserted into the insertion groove of the pipe brace, and the leading edge is welded to the side surface of the lower column, and the insertion part In addition, the outer periphery of each of the pipe braces is welded, and the hollow interior of the lower strut in the pipe brace mounting range is supplemented respectively. Because it is structure with the use disc ribs,
When the spherical tank rolls due to an earthquake or strong wind, and the tensile and compressive force is applied to the pipe brace, the upper gusset plate and the lower gusset plate connected to the end plate and the lower strut have a long distance between the upper side and the side side. In addition, since the center of the pipe brace is inserted and the periphery of the pipe brace is welded, the connection strength is increased and the welded portion with the lower strut and the vicinity thereof are not damaged, and the upper gusset plate and The tensile and compressive load applied near the lower gusset plate mounting part is supported by the reinforcing disc rib provided inside the hollow of the lower support column, preventing the hollow lower support column from being crushed, deformed or damaged, and strong. A brace attachment structure is obtained.

It is front explanatory drawing of a leg part structure at the time of providing the tie rod brace of the brace attachment part structure of the spherical tank leg part concerning this invention between support | pillars. It is explanatory drawing which shows the upper part vicinity of the tie rod brace attaching part of FIG. It is explanatory drawing which shows the lower part vicinity of the tie rod brace attaching part of FIG. It is front explanatory drawing of a leg part structure at the time of providing the pipe brace of the brace attachment part structure of the spherical tank leg part concerning this invention between support | pillars. It is explanatory drawing which shows the upper part vicinity of the pipe brace attaching part of FIG. It is explanatory drawing which shows the lower part vicinity of the pipe brace attaching part of FIG. It is explanatory drawing which shows the upper part vicinity of the other embodiment example of a pipe brace attaching part. It is explanatory drawing which shows the lower part vicinity of the other embodiment example of a pipe brace attaching part. It is explanatory drawing which shows the spherical tank provided with the conventional general tie rod brace. It is explanatory drawing which shows the spherical tank provided with the conventional general pipe brace. It is explanatory drawing which shows the damage example of the tie rod brace attaching part of FIG. It is explanatory drawing which shows the damage example of the pipe brace attaching part of FIG.

An embodiment of a spherical tank leg brace mounting structure according to the present invention will be described with reference to FIGS.
1 to 8, the same reference numerals are used for the same terms, 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.
The structure of the spherical tank leg part for supporting the spherical shell 2 of the spherical tank 1 on the foundation 4 is composed of support columns 3 and 3 and braces 5 provided to be inclined between the support columns 3 and 3. which is a structure linked. The number of the columns 3 is set according to the scale of the spherical tank 1.

Figure 1 is a front view of the leg structure obtained when a tie rod brace 51 between the mounting posts 3, leg structure of spherical tank 1 by a plurality of struts 3 Tamakaratai (Tamakaraban) 2 The structure is supported and installed on the foundation 4, and tie rod braces 51, 51 in the form of steel bars that are inclined are provided between the columns 3, 3.

FIG. 2 is an explanatory view showing, in an enlarged manner, the vicinity of the upper mounting portion of the tie rod brace 51 shown in FIG.
The support column 3 has a structure in which an upper support column 3a and a lower support column 3b are connected.
Also, with the end plate 6 extending in a flange shape which is provided so as to block the upper end of the lower strut 3b to the lower end of the upper strut 3a, cross-shaped guide plate to be connected guide the lower end of the end plate 6 7 is a structure which is fixed to.
Further, the guide plate 7 is fitted on the lower strut 3b made of hollow bodies, a structure for connecting the upper strut 3a by welding the lower end peripheral edge of the end plate 6.
Tie rod brace 51 has a structure which is linked with fitting pin structure in the upper gusset plate 51A.
The upper gusset plate 51A is fixed by welding the upper edge a1 the flange lower edge of the end plate 6, a structure for fixing by welding the side edge sides b1 to the upper surface of the lower strut 3b.
Also within the scope of the side end edge b1 of the lower strut 3b, a structure for fixing by welding a peripheral fitted a reinforcing disc rib 8.

Since the lower end of the upper column 3a is provided with a bowl-shaped end plate 6 and a cross-shaped guide plate 7 is fixed to the lower end of the end plate 6, the rigidity of the connecting portion of the lower column 3b is improved. However, the strength of the lower support column 3b in the vicinity of the attachment portion of the tie rod brace 51 is increased, and deformation and damage are not caused.
Spherical tank 1 by such as earthquakes and strong winds and rolling, when a tensile force is applied to the tie rod brace 51, upper sides a1 and the side end edge b1 of the upper gusset plate 51A is over the end plate 6 and the lower strut 3b Since the structure is welded at a long distance, the welded portion of the upper gusset plate 51A with the lower support 3b and the vicinity thereof are not damaged.
Further, the load applied to the vicinity mounting portion of the upper gusset plates 51A, because it is supported by the reinforcing disc ribs 8 provided inside the lower strut 3b, to prevent deformation or damage or collapse the lower strut 3b, strength A high brace mounting structure is obtained.

FIG. 3 is an explanatory view showing, in an enlarged manner, the vicinity of the lower portion of the attachment portion of the tie rod brace 51 shown in FIG.
The lower strut 3b has a structure in which a base plate 9 is provided on the base 4 , and a tie rod brace 51 is connected to the lower gusset plate 51B via a pin structure mounting jig. The lower gusset plate 51B is a structure in which the lower end side a2 is fixed to the upper end edge of the flange portion of the base plate 9 by welding, and the side end side b2 is fixed to the lower side surface of the lower support column 3b by welding . Further, a structure for fixing by welding a peripheral fitted a reinforcing disc rib 10 within the welding range of the lower surface of the lower strut 3b.
If the tensile force is applied to the tie rod brace 51, because the lower end sides a2 and the side end edge b2 of the lower gusset plate 51B is welded structure to the base plate 9 and the lower strut 3b, the lower strut 3b of the lower gusset plate 51B The welded part and the vicinity thereof are not damaged.
Further, the load applied to the vicinity mounting portion of the lower gusset plate 51B, because it is supported by the reinforcing disc rib 10 provided inside the lower strut 3b, to prevent deformation or damage or collapse the lower strut 3b, strength High brace attachment structure.

4, supporting the pipe brace 52 in front view of the leg structure when provided between column 3, leg structure of spherical tank 1 is a Tamakaratai (Tamakaraban) 2 by a plurality of struts 3 in established structure on foundation 4, between each other the strut 3,3 is provided with a pipe braces 52, 52 made of inclined tubing having crossed.

FIG. 5 is an enlarged explanatory view showing the vicinity of the upper portion of the brace mounting portion of FIG. 4. The support column 3 is composed of an upper support column 3a and a lower support column 3b, and a bowl- shaped end plate 6 is formed at the lower end of the upper support column 3a. the provided, in the structure which is fixed a cross-shaped guide plate 7 to be connected guide the lower end of the end plate 6, the lower strut 3b is a structure fitted to the guide plate 7 at its upper end, the In this structure, the lower peripheral edge of the end plate 6 is welded and connected.
The pipe brace 52 provided by being symmetrically welded with the lower support 3b interposed therebetween has a structure in which the left and right brackets 11a and 11a are welded to the vicinity of the lower part and welded to the side surface of the lower support 3b.
Further, in the interior of the lower strut 3b of the pipe brace 52 mounted range, the structure to weld fixing the peripheral edge is fitted a reinforcing disc rib 8.

When the spherical tank 1 rolls due to an earthquake or a strong wind and a tensile force or a compressive force is applied to the pipe brace 52, the spherical tank 1 is held and relaxed by the left and right brackets 11a and 11a connected to the lower column 3b.
Moreover, since the load of the tensile force or the compressive force applied to the vicinity of the attachment portion of the pipe brace 52 is supported by the reinforcing disc rib 8 provided inside the lower column 3b, the lower column 3b is crushed, deformed or damaged. This is a brace mounting part structure with high strength.

FIG. 6 is an enlarged explanatory view showing the vicinity of the lower part of the attachment part of the pipe brace 52 shown in FIG. 4. The lower column 3b has a structure in which a base plate 9 is provided on the foundation 4 , and the pipe brace 52 is an upper part. the left and right brackets 11b, as well as a structure welded to the side surface of the lower strut 3b held in 11b, a structure welded fixing the peripheral edge is fitted a reinforcing disc rib 10 within the attachment area of the pipe brace 52 There is .
When a tensile force or a compressive force is applied to the pipe brace 52, the load of the tensile force or the compressive force that is relaxed by the left and right brackets 11b and 11b connected to the lower column 3b and is applied to the vicinity of the attachment portion of the pipe brace 52 is Since it is supported by the reinforcing disc rib 10 provided inside the lower support column 3b, the lower support column 3b is prevented from being crushed, deformed or damaged, and a brace attachment structure having a high strength is obtained.

FIG. 7 is an explanatory view showing, in an enlarged manner, the vicinity of the upper portion of another embodiment of the pipe brace 52 mounting portion. The upper gusset plate 52A is disposed between the end plate 6 at the lower end of the upper column 3a and the side surface of the lower column 3b. It is a structure to weld.
Pipe brace 5 2 provided welded symmetrically across the lower strut 3b has an open ended insertion slot (shown schematically on the right side) in the center, an insertion groove of the pipe brace 52 in the upper gusset plate 52A a difference crowded welded the leading edge of the pipe brace 52 on the side surface of the lower strut 3b in structure, a structure that further welding the periphery of the spigot.
Further, in the interior of the lower strut 3b of the mounting range of the pipe brace 52, a structure of welded fixing the peripheral edge is fitted a reinforcing disc rib 8.

The upper gusset plate 52A connected to the end plate 6 and the lower column 3b has a long upper side and side when the spherical tank 1 rolls due to an earthquake or a strong wind and a tensile force or a compressive force is applied to the pipe brace 52. structure by welding at a distance, yet because of the structure that is welded to the periphery of the insertion portion crowded difference the insertion slot which is open at the center of the pipe brace 52, the welded portion between the lower strut 3b increased connection strength And its vicinity will not be damaged.
Furthermore, since the load of the tensile force and the compressive force applied to the vicinity of the mounting portion of the upper gusset plate 52A is supported by the reinforcing disc rib 8 provided inside the lower column 3b, the lower column 3b is crushed, deformed or damaged. The brace attachment structure with high strength can be obtained.

FIG. 8 is an explanatory view showing, in an enlarged manner, the vicinity of the lower part of another embodiment of the pipe brace 52 mounting portion. A base plate 9 is provided at the lower end of the lower column 3b, and the space between the base plate 9 and the side surface of the lower column 3b is shown. the structure to weld the lower gusset plate 52B on. The pipe brace 52 which is provided by being symmetrically welded with the lower support 3b interposed therebetween has a structure in which an insertion groove (not shown) is opened in the center , and this insertion groove is inserted into the lower gusset plate 52B. and the edges are welded structure to the side of the lower strut 3b is a structure to weld the peripheral edge of the insertion portion. This is a structure in which the reinforcing disc rib 10 is fitted into the lower support column 3b in the attachment range of the pipe brace 52 and the periphery is welded and fixed .
When a tensile force or a compressive force is applied to the pipe brace 52, the lower gusset plate 52B connected to the end plate 9 and the lower support 3b has a structure in which the lower side and the side side are welded, and the center of the pipe brace 52 is further inserted. in order to be structures by welding peripheral welding part and its vicinity of the lower strut 3b increased connection strength is not damaged.
Further, the load of the tension or compression force applied to the vicinity mounting portion of the lower gusset plate 52B, prevents the lower strut 3b is damaged because it is supported by the reinforcing disc rib 10 provided inside the lower strut 3b strength High brace attachment structure.

The brace mounting structure of the spherical tank leg according to the present invention can be employed not only in the newly installed or existing spherical tank leg seismic reinforcement structure, but also in order to improve rigidity and earthquake resistance. It can also be applied to repairs, modifications, and replacements.

1 Spherical tank
2 spherical shell
3 props
3a Upper support
3b Lower column
4 basics
5 braces
51 Tie Rod Brace
51A Upper gusset plate
51B Lower gusset plate
52 Pipe brace
52A Upper gusset plate
52B Lower gusset plate
6 End plate
7 Guide plate
8 Reinforcing disc rib
9 Base plate
10 Reinforcing disc rib
11 Bracket

Claims (4)

In the structure of the leg portion that supports the spherical shell of the spherical tank with the support column, the hollow lower support column connected by braces inclined between the support columns and the bowl-like shape provided so as to close the upper end of the lower support column A brace provided with an end plate, a guide plate provided on the back surface of the end plate and fitted to the hollow lower column, and an upper column joined to the upper surface of the end plate, and provided with an inclination between the columns. A brace mounting structure for a spherical tank leg, characterized in that is a tie rod brace or a pipe brace. The brace is a tie rod brace, and has a structure in which an upper gusset plate that engages with an upper portion of the tie rod brace is welded to each of a back surface of an end plate provided at a lower end of the upper column and an upper side surface of the lower column, and the upper gusset. The brace mounting structure for a spherical tank leg according to claim 1, wherein the structure is provided with a reinforcing disc rib inside the hollow of the lower support column corresponding to the welding range of the plate. The brace is a pipe brace, and has a structure in which the vicinity of the portion welded symmetrically at the upper and lower portions of the lower support of the pipe brace is held by left and right brackets, and ends of each pipe brace 2. The brace mounting structure for a spherical tank leg according to claim 1, wherein a reinforcing disk rib is provided in the hollow inside of the lower support column corresponding to the welding range of the place where the steel tank is welded. The brace is a pipe brace provided so as to be symmetrically inclined with respect to the hollow lower column, between the end plate at the lower end of the upper column and the side surface of the lower column and between the lower end of the lower column and the side surface of the lower column. The upper gusset plate and the lower gusset plate are welded to each other. The pipe brace is attached to the upper gusset plate and the lower gusset plate. The upper and lower gusset plates are inserted and the tip edge is welded to the side surface of the lower column, and the periphery of the insertion portion is welded, and the hollow interior of the lower column in the pipe brace attachment range is reinforced. 2. A spherical tank leg according to claim 1, which has a structure including a disc rib for use. Brace mounting portion structure of.

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