JP2002357092A - Rigid member producing method and combined rigid structure connected by flexible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome a problem of electric corrosion of a combined rigid structure embedded in the ground, the electric corrosion being caused by a potential difference generated when electric current is applied to a portion at which different metals make contact with each other at the time of producing the combined rigid structure. SOLUTION: When the combined rigid structure is formed by connecting a plurality of rigid members by a flexible joint, the rigid members are separated by an electrical insulator at a joint portion, in order to prevent the different metals from making contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite rigid structure connected by a flexible joint, and more particularly to a method for manufacturing a rigid member in which electrical corrosion is prevented and a composite rigid structure.

[0002]

2. Description of the Related Art Box culverts, shield tunnels, submerged tunnels, and the like buried underground or underwater are constructed by connecting a plurality of rigid bodies with flexible joints.
The flexible joint used in this structure has a function of coping with relative displacement of the rigid body while having a water stopping function.
000-320758.

FIG. 9 shows a partial view of a conventional composite rigid structure connected by the above-mentioned flexible joint.
Reference numeral 1 denotes a cylindrical rigid member made of reinforced concrete, and 2 denotes an outer frame that also serves as a mold, and is provided at an end of the rigid member 1.
Reference numeral 3 denotes an anchor bolt, and 4 denotes a flexible joint for connecting the opposing rigid members 1 (between the outer frames 2). Both ends of the flexible joint are attached to the anchor bolt 3 via a holding plate 5, a washer 6, and a nut 7. And is fixed to the outer frame 2. The outer frame 2 and the anchor bolt 3 are fixed by welding.
Reference numeral 8 denotes a joint material inserted into the joint of the rigid member 1.

[0004]

A composite rigid structure as shown in FIG. 9 is buried underground or underwater as described above, and the material of each member used in the structure is as follows. The outer frame 2 and the holding plate 5 are made of relatively inexpensive rolled steel having a general structure, for example, SS400. The anchor bolts 3, washers 6, and nuts 7 are made of stainless steel, for example, SUS304 in consideration of corrosion resistance. It is used.

On the other hand, when a leakage current or the like from a rail in an electric railway flows into the ground, it flows through a metal portion of the buried composite rigid structure, and at that time, a contact portion of a different material, that is, an outer frame. 2 and the anchor bolt 3, a potential difference is generated in a contact portion between the anchor bolt 3 and the holding plate 5, and a contact portion between the holding plate 5 and the washer 6, thereby causing electrolytic corrosion. , The water leaks, the corrosion further progresses, the durability of the structure is reduced, and the concrete structure itself is likely to collapse. The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a method of manufacturing a rigid member in which electrolytic corrosion is prevented and a composite rigid structure.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a rigid member formed by casting concrete on an outer frame made of metal. An anchor member for fixing the rigid member is fixed, wherein the anchor member includes a female screw portion made of ceramics and a male screw portion made of stainless steel screwed to the female screw portion. The female screw portion from which the male screw portion has been removed is fixed to the outer frame via a temporary fixing bolt, and then concrete is cast to bury the female screw portion.

[0007] A second aspect of the present invention is that the anchor member is made of a stainless steel anchor bolt, and an insulating cylinder having an internally threaded flange is screwed and positioned at an arbitrary position of the anchor bolt. The distal end side of the anchor bolt and the insulating tube are fitted into the hole of the outer frame, the anchor bolt is fixed via the temporary fixing member, and then concrete is cast to fix the anchor bolt.

A third aspect of the present invention is a composite rigid structure constituted by connecting a plurality of rigid members having a metal outer frame via a flexible joint, wherein the rigid member and the flexible joint are connected to each other. The connecting portion is fixed with an anchor member made of a metal different from the outer frame metal. A flexible joint, a holding plate, and an insulating spacer are laminated on the outer frame, and the anchor member is penetrated through the laminated portion. Provided, this anchor member and outer frame,
The holding plate is insulated by an insulating cylinder inserted into the anchor member and fixed by a fastening member.

A fourth aspect of the present invention is that the anchor member comprises a female screw portion made of ceramics and a male screw portion made of stainless steel screwed to the female screw portion, and the female screw portion has the rigidity. It is characterized by being buried in the concrete of the member.

According to a fifth aspect of the present invention, the anchor member is an anchor bolt made of stainless steel, and a flange having a female screw portion is formed on the insulating cylinder, and the flange is screwed to the anchor bolt. The rigid member is embedded in concrete.

According to a sixth aspect of the present invention, the anchor bolt is provided with a stopper, and the flange portion of the insulating cylinder is screwed to the stopper position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The same or corresponding parts as those in the drawings are denoted by the same reference numerals and description thereof will be omitted. In FIG. 1, reference numeral 10 denotes an anchor member. The anchor member 10 includes a female screw portion 11 made of ceramics and a stat bolt 12 made of stainless steel and having a male screw portion screwed to the female screw portion 11. ing. As a main component of the ceramic, any one of aluminum oxide, zirconia, silicon carbide, and silicon nitride is used as a main component, and 8 to 10
After adding and mixing the weight% of the sub-components, molding is performed, and
The internal thread portion 11 is formed by firing at 1700 ° C. for 1.5 to 3.00 hours.

FIG. 2 is a partially enlarged view showing an example of a state in which the flexible joint 4 is fixed using the anchor member 10. In the figure, reference numeral 13 denotes a rubber packing, for example, S of a rolled steel material.
Outer frame 2 made of S400 and female screw portion 11 of ceramics
It is arranged in between. Reference numeral 14 denotes an insulating cylinder, which is formed of cylindrical ceramics, has an inner diameter slightly larger than the outer diameter of the stat bolt 12, and has a length from the upper surface of the rubber packing 13 to an insulating spacer 15 described later. The length is reached. Although the rubber packing 13 is not always necessary, it is safer to arrange the rubber packing 13 in order to prevent contact between different metals between the outer frame 2 and the stat bolt 12.
In addition, a flange portion corresponding to the rubber packing 13 may be provided at one end of the insulating tube 14 so that the rubber packing 13 can be substituted.

The insulating cylinder 14 may be made of ceramics of the female screw portion 11, but can be made elastic by using a fiber reinforced insulating material. As insulation reinforced insulation, insulating fibers such as ceramics and glass, resin,
It is made of a mixture with an insulating base material such as rubber. The insulating spacer 15 is formed of the same material as the insulating cylinder 14 and is placed on the upper surface of the press plate 5 made of, for example, a rolled steel material of SS400. At this time, a concave portion is formed on the upper surface of the press plate 5 to form a recess. By inserting the insulating spacer 15 therein, it is possible to prevent displacement and to keep the height in the tightening direction low. The flexible joint 4 is made of a resin, rubber or the like as a base material, reinforced with fibers such as nylon or polyester, or a corrugated member such as a metal diaphragm.

FIG. 3 shows another embodiment in which a part of the rigid member is made of only a steel material. That is, the portion where concrete is cast is the rigid member 1 in which the anchor member 10 is embedded, and the rigid member 1a fixed to the rigid member 1 by fixing means such as welding is made of steel. The rest is configured similarly to FIG.

FIG. 4 shows a method for fixing the female screw portion of the anchor member. (A) As shown in the figure, a female screw portion 11 of an anchor member is disposed at a predetermined position of an outer frame 2 also serving as a mold via a rubber packing 13 so that the female screw portion 11 faces the outer direction of the outer frame 2 (counter female screw portion). Side), a temporary fixing bolt 20 is screwed into the female screw to be fixed. The temporary fixing bolt 20
(B) As shown in the figure, a centering portion 21 is provided, and the female screw portion 11 is correctly (vertically) firmly fixed to the outer frame 2 by inserting the centering portion 21 into a hole of the mold. You. After fixation, concrete is cast and rigid member 1 is formed,
After the drying, the temporary fixing bolts 20 may be removed as shown in FIG. 7C, or the rigid members 1 may be left in a screwed state until the rigid member 1 is used.

FIG. 5 shows a procedure for mounting the flexible joint 4. First, the stat bolt 12 is screwed and fixed to the female screw portion 11 from which the temporary fixing bolt has been removed. After attaching one end of the flexible member 4 to the bolt 12 through a hole previously drilled, the insulating tube 12 is connected to the bolt 1.
Insert into 2. At this time, the tip of the insulating tube 12 is inserted to a position where the rubber packing 13 embedded in the concrete comes into contact.

Next, the holding plate 5, the insulating spacer 14, and the flat washer 6, the spring washer 9, and the nut 7 are inserted in this order, and the nut 7 is tightened. The flexible joint 4 is fixed. The rust-proof cap or rust-proof coating is applied to the head of the nut 4 or the stat bolt 12 after being fixed, if necessary. The other side of the flexible joint 4 is similarly fixed, and a composite rigid structure such as a box culvert, a shield tunnel, or a submerged tunnel in which a plurality of rigid members are connected by the flexible joint is configured. With the above-described configuration, there is no contact portion between different metals, so that even if a current flows, a potential difference does not occur and electrolytic corrosion is prevented. Further, if a corrosion phenomenon occurs in the vicinity of the bolt 12 for some reason, the bolt 12 can be removed from the embedded female screw portion 11, so that replacement work can be performed easily.

FIG. 6 shows an example in which the anchor member is a conventional anchor bolt 3 made of stainless steel. Numeral 16 denotes an insulating cylinder, which is shown in FIG.
Etc., and is formed by a member similar to that of the insulating cylinder 14 at one end, and a flange portion 16a formed integrally with one end as shown in FIG. have. A female screw 16b for screwing with the anchor bolt 3 is provided in the inner hole portion of the flange portion 16a.
Is screwed. Others are the same as FIG.

FIG. 7 shows a method of fixing an anchor bolt. (A) As shown in the figure, the flange portion 16a of the insulating cylinder is screwed to a predetermined position of the anchor bolt 3, and the tip of the anchor bolt 3 and the insulating cylinder 16 are inserted into a hole formed in the outer frame 2 from the inside of the mold. Is inserted. Next, as shown in FIG. 2 (b), the seat cylinder 2 is further attached to the tip of the anchor bolt 3 protruding outward (toward the flange side) and the insulating cylinder 16.
After the 2 is inserted, the anchor bolt 3 is fixed to the outer frame 2 by screwing the nut 24 through the seat plate 23. Thereafter, the rigid member 1 is formed by casting concrete. When the flexible joint 4 is attached, the attachment is performed after the seat cylinder 22, the seat plate 23, and the nut 24 are removed.
The mounting procedure is performed by the same procedure as that shown in FIG.

FIG. 8 shows an example in which a projecting stopper 17 is provided at an arbitrary position of the anchor bolt 3. The arbitrary position here is a position where the flange portion 16a to be screwed is positioned. By providing the stopper 17, the length of the male screw portion screwed to the anchor bolt 3 is shortened and fixed. The protrusion length of the anchor bolt can be made constant. Others are the same as FIGS.

[0022]

As described above, according to the present invention, the connection portion for forming the composite rigid structure is separated by an insulator so as not to cause a contact with a different metal, so that even if a current flows, a potential difference is generated. And no electrical corrosion occurs. Therefore, the rigid member made of concrete can be stably maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a connection partial view of a composite rigid structure showing an embodiment of the present invention.

FIG. 2 is a mounting partial view of a flexible joint according to the present invention.

FIG. 3 is a connection partial view of a composite rigid structure showing another embodiment of the present invention.

FIGS. 4A and 4B are explanatory views of the manufacture of the rigid member of the present invention, wherein FIG. 4A is a view showing a mounting state of a female screw portion to an outer frame, FIG. 4B is an outline view of a temporary fixing bolt, and FIG. State diagram after.

FIG. 5 is an explanatory view of a flexible joint connection according to the present invention.

FIGS. 6A and 6B show another embodiment of the present invention, wherein FIG. 6A is a partial view of a flexible joint, and FIGS.

FIGS. 7A and 7B are explanatory views of the manufacture of the rigid member of the present invention, wherein FIG. 7A is an outline view of an anchor bolt, and FIG.

FIG. 8 is an external view of an anchor bolt according to another embodiment of the present invention.

FIG. 9 is a configuration diagram of a connection portion of a conventional composite rigid structure.

[Explanation of symbols]

 1, 1a: Rigid member 2: Outer frame 3: Anchor bolt 4: Flexible joint 5: Holding plate 6: Flat washer 7: Nut 8: Joint material 9: Spring washer 10: Anchor member 11: Female thread 12 Stat bolt 13 Rubber packing 14 Insulating cylinder 15 Insulating spacer 16 Insulating cylinder 16a Flange 16b Female screw 17 Stopper

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F16L 58/00 E21D 10/12 (72) Inventor Kosuke Furuichi 1-7-2 Moto-Akasaka, Minato-ku, Tokyo Established Kashima Incorporated (72) Inventor Yasuyuki Hayakawa Kashima Construction 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside (72) Inventor Kunihiko Takimoto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Established Kashima Inside (72) Inventor Kiyofumi Ogita 515 Address Kaminakamizo, Higashimonmon, Numazu City, Shizuoka Prefecture Inside (72) Inventor Nori Iida 515 Kaminakamizo, Higashimonmon, Numazu City, Shizuoka Prefecture Meiden Ceramics Corporation F Terms (reference) 2D055 BA01 EA01 GD02 GD05 2D063 BA06 BA26 3H024 DA01 3H104 JA07 JD09 KA01 KB20 LB01 LB36 LB37 LB38 MA01 MA10

Claims (6)

[Claims] 1. A rigid member formed by casting concrete on an outer frame made of metal, for connecting a plurality of rigid members to a concrete casting portion of the rigid member via a flexible joint. In fixing the anchor member, the anchor member comprises a female screw portion made of ceramics and a male screw portion made of stainless steel screwed to the female screw portion, and the female screw portion from which the male screw portion is removed A method for manufacturing a rigid member, comprising: fixing a portion to the outer frame via a temporary fixing bolt; and pouring concrete to bury a female screw portion. 2. The anchor member is made of a stainless steel anchor bolt. An insulating cylinder having a threaded female thread is screwed and positioned at an arbitrary position of the anchor bolt, and a hole in the outer frame is formed. 2. The method for manufacturing a rigid member according to claim 1, wherein a tip end side of the anchor bolt and the insulating tube are fitted into the anchor member, and the anchor bolt is fixed by anchoring the anchor bolt via a temporary fixing member, and then the concrete is cast. . 3. A composite rigid structure formed by connecting a plurality of rigid members having a metal outer frame via a flexible joint, wherein a connection portion between the rigid member and the flexible joint is an outer part. In an object to be fixed with an anchor member made of a metal different from the frame metal, a flexible joint, a holding plate, and an insulating spacer are laminated on the outer frame, and an anchor member is provided through the laminated portion to provide an anchor member. A composite rigid structure connected by a flexible joint, wherein a member, an outer frame, and a holding plate are insulated by an insulating cylinder inserted into an anchor member and fixed by a fastening member. 4. The anchor member includes a female screw portion made of ceramics and a male screw portion made of stainless steel screwed to the female screw portion, and the female screw portion is embedded in concrete of the rigid member. The composite rigid structure connected by the flexible joint according to claim 3, wherein the composite rigid structure is configured as follows. 5. The anchor member is an anchor bolt made of stainless steel, and a flange portion having a female screw portion is formed on the insulating cylinder, and the flange portion is screwed to the anchor bolt to form the rigid member. The composite rigid structure connected by a flexible joint according to claim 3 or 5, wherein the composite rigid structure is embedded in concrete. 6. A composite rigid structure connected by a flexible joint according to claim 5, wherein a stopper is provided on said anchor bolt, and a flange portion of said insulating cylinder is screwed to said stopper position. .