JP4054302B2 - Sealed lid assembly of steel pipe member end joint - Google Patents

Description

  The present invention relates to a hermetic lid assembly that seals an opening formed in an end joint of a steel pipe member constituting a framework of a steel pipe structure such as a power transmission tower or a communication tower.

  In transmission towers, telecommunication towers, etc., the end joints that join steel tower steel pipe members to steel tower main column steel pipe members are interrupted with U-shaped plates, cross-shaped plates, etc. welded to the ends of steel tower steel pipe members There are U-shaped plate joints and cross-shaped plate joints.

  For convenience of explanation, an example of a conventional interrupt type U-shaped plate joint will be described with reference to FIGS. 9 is a plan view of an example of a conventional interrupt type U-shaped plate joint 1, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a cross-sectional view taken along line XI-XI of FIG. FIG. 12 is an enlarged cross-sectional view of a portion in the XII circle of FIG.

  As shown in FIGS. 9-12, the interrupt type U-shaped plate joint 1 has a U-shaped plate 4 formed by forming a U-shaped slit 3 at the end of a steel tower steel pipe member 2 and bending the steel plate into a U-shape. Are inserted into the slit 3 and both are joined by welding (welded portion 5 in FIGS. 11 and 12). A gusset plate 8 is fixed to the steel tower main column steel pipe member 7 by welding. A joint bolt hole 6 is drilled at the same position on the tips of the U-shaped plate 4 and the gusset plate 8. The U-shaped plate 4 and the gusset plate 8 are fastened and fixed by inserting bolts (not shown) into the bolt holes 6.

  The steel tower steel pipe member 2 to which such a U-shaped plate joint 1 is attached is subjected to hot dip galvanizing for rust prevention. Therefore, the end of the steel pipe member 2 remains open, and after construction of the steel tower, rainwater, sea salt particles, etc. infiltrate the steel pipe member, causing corrosion of the inner surface of the steel pipe member, or invading birds and nesting. In addition, there is a problem such as a whistling sound caused by wind. In order to prevent these phenomena, the semicircular opening 9 (see FIGS. 9 and 11) may be closed, but the conventional opening closing method has various problems.

  First, in order to prevent bird nesting, there is a method of attaching a conical spring-shaped hardware between the U-shaped plate 4 of the U-shaped plate joint 1 and the inner peripheral surface of the steel tower belly pipe member 2 after assembling the steel tower. As another method, there is a method of welding a semicircular steel plate to the end portion of the steel pipe member 2 and the plate 4 before the hot dip galvanization of the steel pipe member 2. Since these methods are not airtight and cannot prevent rainwater from entering and air from entering and exiting, the inner surface corrosion of the steel pipe member 2 cannot be prevented. In addition, since the wind cannot be prevented from entering and exiting, a whistling sound is generated.

  In order to prevent nesting and wind noise, after the hot dip galvanization of the steel pipe member 2, the end of the steel pipe member 2 and the plate 4 are brought into contact with a semicircular stainless steel plate, and the stainless steel plate and the outer peripheral surface of the steel pipe member 2 are brought into contact with each other. There is a method of attaching a rubber ring to the surface to be attached and sticking with an adhesive. As another method, after hot dip galvanization, there is a method in which a folded stainless steel plate is attached to the U-shaped plate joint 1 in advance with an adhesive and fixed with a joining bolt at the time of steel tower assembly. Since these methods are not airtight and cannot prevent the intrusion of rainwater and the entry and exit of air, corrosion of the inner surface of the steel pipe member cannot be prevented. Furthermore, when pasted with an adhesive, it may be peeled off during transportation, construction, or construction.

  In order to prevent nesting, prevent wind noise, and prevent corrosion, a method of inserting a semicircular sealing rubber into the space between the inner surface of the end of the steel pipe member 2 and the U-shaped plate joint 1 after hot dip galvanizing of the steel pipe member 2 is possible. is there. In this method, since the end of the steel pipe member 2 is deformed by welding of the U-shaped plate joint 1 and the steel pipe member 2, the sealing rubber produced in advance according to the diameter of the steel pipe does not enter or enters. In some cases, the gap is too large for complete sealing. As a countermeasure, it is conceivable to increase the thickness of the sealing rubber. However, since the joint bolt described above is fastened to the U-shaped plate joint 1 after the construction of the steel tower, the distance between the bolt and the end surface of the steel pipe is short. In some cases, rubber cannot be attached.

  Furthermore, as another method, there is a method in which after the hot dip galvanization of the steel pipe member 2, a base metal and a backup material are mounted and an elastic sealing material is filled (Patent Document 1). Since this method is a high place work at the site after the construction of the steel tower, the work is complicated.

  As a method for sealing a steel pipe member end using a cross-shaped plate joint, there is a method of inserting a quarter-circular elastic sealing lid into the space between the cross-shaped plate joint and the steel pipe member end inner surface (Patent Literature). 2). This method also has the same problems as the sealing rubber insertion method described above.

  The lid provided at the opening of the end joint, which has been used in the past, is not airtight and cannot prevent the ingress of rainwater and the ingress and egress of air, so it cannot prevent corrosion of the inner surface of the steel pipe member. Even if it was able to keep, the work was complicated due to work at high places in the area after the construction of the steel tower, which was also disadvantageous in terms of economy.

  Therefore, in order to solve the above-mentioned problems, the applicant of the present invention provides a hermetic lid assembly that can seal the opening at the end of the steel pipe member formed in the end joint by a simple field work, and a method for attaching the same. Proposed earlier (Japanese Patent Application No. 2002-306347 relating to a patent application dated October 21, 2002).

  The sealed lid assembly of the end joint of the steel pipe member is a sealed lid assembly that seals the opening formed at the end of the steel pipe member by the end joint of the steel pipe member constituting the framework of the steel pipe tower. In order to fix the sealing lid made of an elastic material having substantially the same shape, the elastic sealing material filled in the gap between the sealing lid and the inner surface of the steel pipe member, and the rear portion of the sealing lid and the end joint. It consists of a metal fitting to prevent falling off.

  Further, the method of attaching the sealed lid assembly of the steel pipe member end joint includes a sealed lid assembly in which the opening formed at the end of the steel pipe member by the end joint of the steel pipe member constituting the framework of the steel pipe tower is sealed by the sealed lid. In a body attachment method, a sealing lid made of an elastic material having substantially the same shape as the opening is prepared, and a drop-off prevention bracket fixed to the rear portion of the end joint before the sealing lid is attached to the opening Connecting one end of the sealing lid, connecting the sealing lid to the other end of the drop-off prevention fitting, then inserting the sealing lid into the opening, filling an elastic sealing material from a filling hole of the sealing lid, sealing The elastic sealing material derived from the guide hole provided inside the lid fills the groove provided on the outer periphery of the hermetic lid without any gap.

However, the above-described sealing lid assembly and its mounting method according to the prior application of the present applicant have a complicated injection path of the elastic sealing material provided in the sealing lid, and the injection of the elastic sealing material becomes insufficient. Not only does this occur, but the production cost of the sealed lid increases. Furthermore, the trouble of attaching the metal fitting for preventing the lid from falling off is troublesome.
Registered Utility Model Publication No. 3052002 JP-A-9-119235

  The present invention facilitates the attaching and detaching operation of the sealing lid to the opening in the sealing lid assembly for sealing the opening formed at the end of the steel pipe member by the end joint of the steel pipe member constituting the framework of the steel pipe tower. An object is to ensure airtightness between the opening and the sealing lid by increasing the bonding area.

  In order to solve the above-mentioned problems, the present invention provides an opening formed at an end of a steel pipe member by an end joint of the steel pipe member constituting the framework of the steel pipe tower, and the opening is formed at both ends of the end joint at the ends of the steel pipe member. Of steel pipe member end fittings that are formed in a semi-circular shape or a quarter-circular shape at a portion, and a pair of substantially semi-circular or a pair of substantially quarter-circular sealing lids seal each semi-circular opening. Applies to hermetic lid assemblies. The sealing lid assembly of the steel pipe member end joint of the present invention has a pair or a pair of sealing lids which are substantially the same shape as the opening and are made of an elastic material, and a gap between the sealing lid and the inner surface of the steel pipe member. It consists of a filled elastic sealant. Each sealing lid has an outer flange and an inner flange on both sides of the boss portion. The boss portion further has an auxiliary boss portion inside the inner flange. A plurality of parallel grooves extending in the circumferential direction are provided on the outer peripheral surface of the boss portion, and a plurality of parallel grooves extending in the diametrical direction are provided on the flat end surfaces of the boss portion and the auxiliary boss portion. Sealing material filling holes are provided at predetermined intervals along the peripheral edge and the diametrical edge of the outer flange.

  Air vent holes may be provided at predetermined intervals along the periphery of the inner flange, and air vent holes may be provided at predetermined intervals on the flat end surface of the auxiliary boss. The thickness of the inner flange is preferably smaller than that of the outer flange to provide flexibility.

  According to the present invention, the opening formed in the steel pipe end joint of the member constituting the framework of the steel pipe tower can be sealed with a sealed lid assembly having a simple structure and easy on-site construction, such as rainwater, sea salt particles, etc. Can prevent rusting of the inner surface of the steel pipe member, preventing nesting of living organisms, and further preventing wind noise by blocking the wind. Since the hermetic lid assembly is relatively thin, when the hermetic lid assembly is inserted into the end joint opening, the hermetic lid assembly can be easily inserted into the opening even if the end joint joining bolt is present. .

  In the present invention, generally, an opening is formed at the end of the steel pipe member by the end joint of the steel pipe member constituting the framework of the steel pipe tower, and the opening is substantially semicircular at the end of the steel pipe member on both sides of the end joint. A pair of substantially semicircular sealing lids or a set of substantially quarter-circular sealing lids formed in an approximately quarter circle, and a closed lid assembly of steel pipe member end joints that seals each semicircular opening. Applied to the body.

  With reference to FIGS. 1-8, one Example of the sealing lid aggregate | assembly of the steel pipe member end joint based on this invention is described. In order to simplify the description, a case of a semicircular opening to which the interrupt type U-shaped plate joint described above is applied as an end joint will be described as an example.

  FIGS. 1-4 shows an example in which the hermetic lid assembly of the present invention is applied to the above-described conventional U-shaped plate joint 1 (see FIGS. 9-12). In the U-shaped plate joint 1, a U-shaped plate 4 is inserted into an end portion of the steel tower steel plate member 2 and a contact outer surface is welded. The front end of the U-shaped plate joint 1 is formed with a joining bolt hole 6 and attached to a gusset plate 8 of a steel tower main column steel pipe member 7 (see FIG. 10).

The end joint 1 of the steel pipe member 2 constituting the framework of the steel pipe tower forms a pair of openings 9 at the end of the steel pipe member. A hermetic lid assembly seals the opening 9. The hermetic lid assembly includes a pair of hermetic lids 10 and an elastic sealing material 20 (see FIG. 8C). Each sealing lid 10 has substantially the same shape as each opening 9 and is made of an elastic material such as rubber or synthetic resin. The detailed structure of the sealing lid 10 will be described later with reference to FIGS. The elastic sealing material 20 is filled in the gap between the sealing lid 10 and the inner surface of the steel pipe member and the gap between the sealing lid 10 and the U-shaped plate 4.
The welded portion 5 at the end of the U-shaped plate 4 and the steel pipe member 2 is in a smooth state, and is a substantially semicircular opening 9 defined by the inner semicircular circumference of the steel pipe member 2 and the U-shaped plate 4 (FIG. 2). 11), a sealing lid 10 made of an elastic material (for example, rubber) is inserted from the outside of the steel pipe member 2 (see FIGS. 3 and 4). When the sealing lid 10 is inserted into the opening 9 of the end joint 1, the sealing lid 10 can be set to a thickness that can be easily inserted even if a joining bolt is present.

  As shown in FIGS. 5-7, each sealing lid 10 has an outer flange 12 and an inner flange 13 on both sides of the boss portion 11. The boss portion 11 further has an auxiliary boss portion 14 inside the inner flange 13. A plurality of parallel grooves 111 extending in the circumferential direction are provided on the outer peripheral surface 110 of the boss portion 11, and a plurality of parallel grooves 113 extending in the diametrical direction are provided on the flat end surface 120 of the boss portion 11 and the auxiliary boss portion 14. It is done. Sealing material filling holes 121 and 122 are provided at predetermined intervals along the peripheral edge and diametrical edge of the outer flange 12. Here, “outside” refers to the side facing the outside of the end of the steel pipe member. “Inside” refers to the side facing the inside of the end of the steel pipe member.

  Air vent holes 131 may be provided at predetermined intervals along the periphery of the inner flange 13, and air vent holes 141 may be provided at predetermined intervals on the flat end surface 140 of the auxiliary boss portion 14. The thickness of the inner flange 13 is preferably smaller than the thickness of the outer flange 12 to provide flexibility. As shown in FIG. 5B, notches 123 are provided in the upper and lower ends of the outer flange 12 to accommodate the welded portion 5 between the U-shaped plate 4 and the end of the steel pipe member 2 (see FIG. 5B). (See FIG. 4).

  The arc of the outer flange 12 (steel pipe member end face side) of the sealing lid 10 is larger than the inner diameter of the steel pipe member 2, and serves as a stopper at the time of insertion. The arc of the inner flange 13 (steel pipe member end inner surface side) of the sealing lid 10 is formed to be substantially the same diameter as the arc of the outer flange 12 or somewhat larger than the inner diameter of the steel pipe member 2, and the inner peripheral surface of the steel pipe member 2 after insertion. Press to bend. The inner flange 13 also serves as a base material for preventing the elastic sealing material from leaking into and out of the steel pipe when the elastic sealing material is filled.

  Next, the mounting operation of the hermetic lid assembly of the present invention will be described with reference to FIG. 8 (A)-(B). First, as shown in FIG. 8A, the sealing lid 10 is inserted into the opening 9 of the end joint 1 (steel pipe member 2). At this time, the outer flange 12 of the sealing lid 10 contacts the end surface of the steel pipe member 2, and the inner flange 13 is pressed against the inner surface of the steel pipe member 2 and is bent toward the outer flange 12. Next, as shown in FIG. 8B, an appropriate jig 30 is inserted from the sealing material filling hole 121 of the outer flange 12, and the inner flange 13 curved outward is pushed back inward. . Finally, as shown in FIG. 8C, the elastic sealing material 20 is attached to the sealing lid 10 from the circumferential hole 121 for filling the sealing material of the outer flange 12 and the diametrical hole 122 by an appropriate injection nozzle 40. The inner and outer flanges 12 and 13 and the circumferential groove 111 and the flat end face groove 113 are filled.

  At this time, the air between the inner and outer flanges 12 and 13 and in the flat end face groove 113 is exhausted into the steel pipe member 2 from the air vent hole 131 of the inner flange 13 and the air vent hole 141 of the auxiliary boss 14. By this exhaust, the elastic sealing material 20 densely fills the circumferential groove 111 and the flat end surface groove 113 of the boss portion 11. At this time, the elastic sealing material 20 flows into the air vent holes 131 and 141, but a large amount of leakage does not occur due to the viscosity of the elastic sealing material 20. Further, the elastic sealing material 20 tends to leak into the inside and outside of the steel pipe member 2, but since the outer flange 12 and the inner flange 13 of the sealing lid 10 are present, the grooves 111 and 113 are closely filled without leaking into the inside and outside. can do. Thereby, the grooves 111 and 113 can increase the contact surface area with respect to the limited width dimension of the boss portion, ensuring airtightness between the opening and the sealing lid.

  Here, although not shown, it is obvious that the shape of the sealing lid has a shape corresponding to the opening to be applied, and the number of sealing lids used is a number corresponding thereto. For example, if the opening has a shape that is approximately a quarter of a circle, use four approximately one-quarter circular sealing lids. It will respond by using one piece.

  The present invention provides not only a steel pipe member constituting the framework of a steel pipe structure such as a power transmission tower, a communication tower, but also a sealed lid assembly that seals an opening formed in an end joint of a general steel pipe structure. Is also applicable.

It is a side view which concerns on one Example of the sealing lid aggregate | assembly of the steel pipe member end joint based on this invention. It is the longitudinal cross-sectional view of the sealing lid assembly seen from the II-II line | wire of FIG. FIG. 3 is a cross-sectional view of the hermetic lid assembly as seen from line III-III in FIG. 1. FIG. 4 is a front view of the hermetic lid assembly as seen from line IV-IV in FIG. 1. (A) is a rear view of the sealing lid according to the present invention. FIG. 4B is a front view of the sealing lid according to the present invention. It is the side view of the sealing lid seen from the VI-VI line of the (A) figure of FIG. It is the side view of the sealing lid seen from the VII-VII line of the (B) figure of FIG. It is a longitudinal cross-sectional view of a steel pipe member end part, Comprising: The process of mounting | wearing a steel pipe member end part with a sealing lid is shown. It is a longitudinal cross-sectional view of an example of the conventional interruption type U-shaped plate joint. FIG. 10 is a side view of FIG. 9. It is the cross-sectional view seen from the XI-XI line of FIG. FIG. 12 is an enlarged cross-sectional view of a portion in the XII circle of FIG. 11.

Explanation of symbols

1 Steel pipe end joint (U-shaped plate joint)
2 Steel tower belly pipe member 4 U-shaped plate
5 Welded part 6 Joint bolt hole
7 Steel tower column steel pipe member 8 Gusset plate
DESCRIPTION OF SYMBOLS 9 Opening part 10 Sealing lid 11 Boss part 12 Outer flange 13 Inner flange 14 Auxiliary boss part 20 Elastic sealing material 30 Jig 40 Injection nozzle 121, 122 Filling hole 111, 113 Groove 121, 141 Air vent hole

Claims (3)

An opening is formed at the end of the steel pipe member by an end joint of the steel pipe member constituting the framework of the steel pipe tower, and the opening is substantially semicircular or substantially 4 minutes at the end of the steel pipe member on both sides of the end joint. In a sealed lid assembly formed in one circle and having a pair of substantially semi-circular or a set of approximately quarter-circular sealing lids sealing each said semi-circular or quarter-circular opening,
A pair or a pair of sealing lids made of an elastic material having substantially the same shape as the opening, and an elastic sealing material filled in a gap between the sealing lid and the inner surface of the steel pipe member,
Each of the sealing lids has an outer flange and an inner flange on both sides of the boss portion. The boss portion further has an auxiliary boss portion on the inner side of the inner flange, and extends circumferentially on the outer peripheral surface of the boss portion. A plurality of parallel grooves are provided, and a plurality of parallel grooves extending in a diametrical direction are provided on the flat end surfaces of the boss portion and the auxiliary boss portion, and are arranged at predetermined intervals along a peripheral edge and a diametrical edge of the outer flange. There was a hole for filling the sealing material,
Sealed lid assembly of steel pipe member end joints. The hermetic lid assembly according to claim 1, wherein holes for venting air are provided at predetermined intervals along a peripheral edge of the inner flange, and holes for air venting are provided at predetermined intervals on the flat end surface of the auxiliary boss. . The hermetic lid assembly according to claim 1, wherein the inner flange has a thickness that is smaller than that of the outer flange to provide flexibility.

Images