JP2000272692A - Tower tank made of fiber reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lug from peeling from a tower tank external wall even when a large falling moment is applied, and prevent the tower tank itself from being damaged by fixing the lug having a large contact area with the tower tank external wall, to the lower section of the tower tank, and in addition, forming a member to reinforce the fixation of the lug on the tower tank external wall. SOLUTION: On the external wall at the lower section of this tower tank made of a fiber reinforced plastic, a channel steel which is bend-processed so that the steel can be wound around the lower section of the tower tank, is wound and fixed with a cushioning rubber 5, and then, a resin impregnated glass fiber bundle is wound in a manner to come into contact with both top and bottom flanges 2a and 2b of the channel steel, and the resin is solidified, and by repeating this process, a glass fiber reinforced resin layer 3 for the channel fixation reinforcement is formed. In addition, a pipe 6 for flange reinforcement is preferably arranged between a plurality of anchor bolt holes provided on both flanges 2a and 2b. A plurality of anchor bolts 7 which are embedded in a foundation at a tower tank installation site are fitted in the bolt holes on both flanges 2a and 2b, and are clamped and fixed with a nut 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced plastic (FR) having a metal fitting on an outer wall of a tower tub for engaging an anchor bolt buried in a foundation of an installation place to fix the tower tub.
P). More specifically, the present invention provides a fixing device for fixing the tower tank fixed to the outer wall of the FRP tower tank, which is further fixed to the outer wall of the tower tank, on the outer peripheral wall of the fitting. Tower tank.

[0002]

2. Description of the Related Art Conventionally, as a member for fixing an FRP tower tank to a foundation at an installation place, as shown in FIGS.
A plurality of FRP or steel lugs adhered and fixed to the lower outer wall of the tower tank are known, and as shown in FIG. 5, these lugs are engaged with fixing bolts buried in the foundation to form a tower. A method of fixing the tank to the installation place has been put to practical use. However, when such a fixing method is adopted, if a large overturning moment due to an earthquake or wind load is applied to the vertically long tower tank, each lug installed on the outer wall at intervals is separated from the outer wall of the tower tank, The wall of the tower itself could be damaged, and the strength was uneasy.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tower having a fixing lug having a high strength which does not cause breakage or peeling even with a large overturning moment. .

[0004]

The present invention for solving the above-mentioned problems basically comprises attaching a lug having a large contact area with the outer wall of the tower to the lower part of the tower, and further attaching the lug to the outer wall of the tower. Characterized in that a member for reinforcing the fixation is formed on the outer wall of the tower tank, and includes the following invention.

(1) A mold steel having a structure for engaging and fixing to a foundation at a place where the tower is installed is provided, and a mold steel bent in the circumferential direction of the tower is wound around the lower part of the tower and fixed. A resin-impregnated glass fiber bundle is wound around the outer wall of the tower along the section, and the resin-cured resin-cured member is formed with a fixing reinforcing member for the steel mold, thereby forming a fiber-reinforced plastic tower.

(2) The groove-shaped steel is a U-shaped grooved steel having a U-shaped cross section which is bent so as to be wound around the lower part of the tower, and is associated with a plurality of anchor bolts buried in the foundation of the installation location of the tower. The fiber-reinforced plastic tower tank according to item (1), wherein a plurality of bolt holes to be combined are formed in upper and lower sides (flanges) of the grooved steel.

(3) A mold steel bent along the circumferential direction of the tower tank is wound around the lower part of the tower tank and fixed, and the outer wall of the tower tank along the upper and lower sides (flange) of the mold steel is impregnated with resin. A method of installing a fiber reinforced plastic tower tank on which a fixed reinforcing member of the mold steel is formed by winding a glass fiber bundle and then curing the resin on a foundation of a tower tank installation location, wherein an anchor bolt is attached to the foundation. A method for fixing a fiber-reinforced plastic tower tank to a foundation of a tower tank installation, wherein the anchor bolt is buried, the anchor bolt is fitted in a bolt hole of a mold steel at a lower part of the tower tank, and tightened and fixed with a nut.

(4) The tower tank is a U-shaped grooved steel section which is bent so as to be wound around a lower part of the tower tank,
A tower in which a plurality of bolt holes respectively engaging with a plurality of anchor bolts buried in the foundation of the tower tank installation location are drilled on both upper and lower sides (flange portion), and a grooved steel is fixedly arranged at the lower part of the tower tank. A method of installing the fiber-reinforced plastic tower tank according to (3) above at a tower tank installation location, which is a tank.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an FRP tower tank according to an embodiment shown in the drawings and a method of fixing the same to an installation place according to the present invention. It is not limited to the embodiment. As shown in the example of FIG. 1, the tower tank 1 of the present invention has a manhole 9, a vent pipe 11, a drain nozzle 10, and the like on the upper part of each tower tank.
It is a vertically long FRP tower tank in which the upper tank 1b made of P and the lower tank 1a are joined together by the joining portion 12 of the intermediate section 1c provided with a manhole or the like, and are vertically stacked.
As shown in FIG. 3, the steel bar 2 includes a steel die 2 connected to the anchor bolt 7 at the installation location.

As shown in FIG. 2, the tower steel fixing die 2 installed at the lower part of the tower tank 1 of the present invention has a plurality of anchor bolt insertion holes 2 c formed in the upper and lower flanges 2 a and 2 b of the grooved steel. After being wrapped around the lower outer wall of the tower tank 1 and fixed as shown in FIG. 3, the resin impregnated glass fiber bundle is wrapped around the upper and lower flange portions 2a and 2b to cure the resin. This is repeated to form a glass fiber reinforced resin laminate 3 for fixing and reinforcing the mold steel.

The mold steel 2 is a grooved steel having a U-shaped cross section, and is divided into two as shown in FIG. 2, and has a structure capable of joining both ends by abutting each other with bolts and nuts. It is preferable from the aspect of properties. In addition, anchor bolt insertion holes 2c are provided at a plurality of locations in the upper and lower flange portions 2a and 2b forming opposed side walls of the grooved steel. Further, it is preferable that the flange reinforcing pipe 6 is disposed between the anchor bolt insertion holes 2c and 2c provided in the flanges 2a and 2b.
Such a reinforcing pipe can be sandwiched between both flanges when the anchor bolt 7 embedded in the foundation 8 is inserted into the insertion hole 2c. The pipe 6 has a hole 2c in the lower flange 2b, a pipe 6 and a hole 2c in the upper flange 2a.
When tightening with the nut 4 through the bolt 7 in this order, the flange is prevented from being deformed, firm tightening is possible, and the tower tank is firmly fixed to the foundation.

FIG. 3 shows a fixed reinforcing member for the steel mold 2.
Although the aspect in which the pipe 6 is installed between the two flanges 2a and 2b has been described, a gusset may be arranged as the flange reinforcing member. Further, when the mold steel 2 is wound around and fixed to the outer wall of the tower tank, it is preferable to arrange the buffer rubber plate 5 between the steel mold and the outer wall of the tower tank. Such a cushion rubber plate 5 is preferable because it prevents the metal mold steel from damaging the FRP tower tank wall when a large impact is applied to the mold steel installation location.

The glass fiber reinforced resin laminate 3 wound around and fixed to the outer walls of the upper and lower tower tanks so as to be in contact with the outer surfaces of both flanges of the mold steel 2 is made of a glass fiber reinforced resin obtained by mixing glass fibers and a hardening resin. The glass fiber reinforced laminate having a desired thickness may be formed by repeating the operation of applying the resin to the outer wall of the tower tank so as to be in contact with the outer wall portions of both flanges 2a and 2b and curing the resin. The fiber bundle may be formed by impregnating a curable resin, winding the fiber bundle around the outer wall of the tower tank around both flanges, and then curing the resin.

[0014]

EXAMPLE Next, an example of the present invention will be described based on the results of producing a two-stage type test tank similar to that shown in FIG. 1 and conducting a vibration test using a shaking table.

As upper and lower tanks, FRP tanks 1a and 1b having a body length of 2700 mm, a diameter of 1200 mm and a thickness of 12 mm were produced. The lower part of the upper tank 1b and the upper part of the lower tank 1a were made to have a structure in which the upper and lower tanks 1a and 1b can be connected in the state of the intermediate part 1c shown in FIG. Then
The upper and lower tanks were connected as shown in the middle part 1c of FIG. 1 to produce a tower tank having a total length (height) of 6000 mm. Then, on the tank outer wall 150mm from the bottom of the lower tank,
As shown in FIG. 2, a rubber plate having a thickness of 5 mm and a width of 100 mm is interposed therebetween.
As shown in FIG. 2, two grooved steels having a U-shaped cross section which are bent into a shape (semicircle) at the lower part of the tank in a state of being divided into two (each grooved web 2e has a thickness of 5 m)
m, the width is 100 mm, the two flange portions 2a and 2b that hit the side walls of the groove are 7.5 mm in thickness and 50 mm in height, and the length of each of the two grooved type steels that are bent into a semicircle is 1900. is there. The upper and lower flange portions 2a, 2b of the grooved steel 2 are provided with twelve anchor bolt holes 2c each having a diameter of 23 mm at equal intervals. ) Was wound, and the two end-to-end joints 14 of the mold steel were fastened to the outer wall of the tower tank by tightening with bolts and nuts.

Next, a glass fiber bundle and a resin prepared by mixing 70 parts by weight of glass fiber with 30 parts by weight of an epoxy resin liquid are used, and the glass fiber bundle and the resin are mixed with the outer walls of the upper and lower flanges 2a and 2b of the mold steel 2. The glass fiber reinforced plastic layer having a thickness of 20 mm was formed by repeating the operation of winding around the outer wall of the tower tank so as to be in contact with and then curing the resin. The tower tank produced as described above is connected to the bolt holes 2 of both flanges 1a and 1b of the mold steel.
In a state in which a reinforcing steel pipe having an inner diameter of 27.6 mm, a thickness of 3.2 mm, and a length of 85 mm is sandwiched between c and 2c, as shown in FIG. Fixed on a table. Then, 2.5 in both upper and lower tanks
Each ton of water was injected, and the shaker was operated to gradually increase the overturning moment, and the overturning moment at the time of breakage of the section where the section steel was fixed was determined.

For comparison, as shown in FIG. 5, a L-shaped steel flange 2d having a thickness of 9 mm, a width of 150 mm × 200 mm at the bottom 2f, a width of 150 mm at the flange 2d, and a height of 90 mm. As shown in FIGS. 4 and 5, a lug 13 having a bolt hole with a diameter of 23 mm is attached to the lower side wall of the lower tank of the tower tank by a 20 mm thick FRP laminate 3.
12 are fixed at equal intervals by each lug 13 and the bolts 7 fixed to the shaker base are engaged with each other, and are fixed on the shaker base by the fixing nuts 4, and the upper and lower tanks are fixed as described above. After injecting water, the shaker was operated to determine the overturning moment. The breaking overturning moment at the lugs of both the tanks was as shown in Table 1. In addition, the work time required to produce a tower in which both types of rugs were fixed at the bottom of the tower was compared. The results were as shown in Table 1.

[0018]

[Table 1]

[0019]

As is clear from the above comparison results, the tower tank of the present invention has a U-shaped grooved steel section fixed at the lower part of the tower tank, and both flanges of the grooved steel are attached to the outer wall of the tower tank around the tower tank. Since the FRP laminate is provided in contact with the outer wall to reinforce the fixation of the mold steel to the outer wall of the tower, not only the strength is several steps better than the conventional fixed lugs, but also the work of attaching to the outer wall of the tower However, there is also an advantage that the production time can be shortened because it can be performed mechanically simultaneously with the production of the FRP tank on the cored bar.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tower tank of the present invention.

FIG. 2 is a perspective view of a grooved steel installed at the lower part of the tower tank according to the present invention.

FIG. 3 is an enlarged view of a portion surrounded by a circle in FIG. 1 showing a fixed state of the tower tank to a foundation.

FIG. 4 is a layout diagram of fixing lugs in a conventional tower tank.

FIG. 5 is a view showing a state in which a conventional tower tank is fixed to a foundation.

[Explanation of symbols]

1: tower tank, 1a: lower tank, 1b: upper tank, 1c: middle part,
2: Shape steel, 2a, 2b, 2d: flange portion, 2c: bolt hole, 2e: web, 2f: bottom portion, 3: FRP lamination,
4: Nut, 5: cushion rubber, 6: reinforcement pipe, 7: anchor bolt, 8: foundation, 9: manhole, 10: drain nozzle, 11: ventilation pipe, 12: joint, 13: lug, 1
4: Butt joint

Continued on the front page (72) Inventor Seiji Matsumoto 90 Maeda, Fuji City, Shizuoka Prefecture Fuji Chemical Co., Ltd. In-house F-term (reference) 3E070 AA03 DA08 QA05 SA02 SA06 VA30

Claims (2)

[Claims] 1. A grooved steel having a structure for engaging and fixing to a foundation at an installation location of a tower, and being bent and fixed along a circumferential direction of the tower, is wound around a lower portion of the tower and fixed. A resin-impregnated glass fiber bundle is wound around the outer wall of the tower along the both sides of the mold steel, and a fixing reinforcing member for the groove-shaped steel formed by curing the resin is disposed, and is made of fiber-reinforced plastic. Tower tank. 2. The grooved steel is a U-shaped grooved steel which is bent so as to be wound around a lower portion of a tower tank,
The fiber according to claim 1, wherein a plurality of bolt holes respectively engaging with a plurality of anchor bolts installed on the foundation of the tower tank installation site are formed in the flange portions on both sides of the grooved steel. Tower tank made of reinforced plastic.