JP2002115370A - Structure of coupler for connecting pc steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structure of a coupler for connecting a PC steel material having excellent workability and reliability of connection. SOLUTION: In this structure of the coupler for connecting the PC steel material, a pair of fixing parts formed of male cones 11 and 21 holding PC steel materials 10 and 20 inserted into female cones 12 and 22 are connected to each other through a coupler 30. The outer periphery of the coupler 30 is covered with a sheath 50, and a retaining plate 23 for preventing the extraction of the male cone 21 from the female cone 22 disposed at the end face of the male cone 21 having a sheath cap 60 fitted to the sheath end face thereof. The sheath cap 60 is formed dividably into a plurality of parts on radial divided surfaces. A spacer 40 may be disposed between both fixing parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a coupler structure for connecting a PC steel material used in a prestressed concrete method,
The present invention relates to an end structure and a sheath cap of a PC steel material used for the coupler structure.

[0002]

2. Description of the Related Art PC steel materials are connected by a coupler structure in a bridge or the like using an external cable method. FIG. 17 is a partial sectional view of a conventional coupler structure. This is a structure in which the PC steel material 20 on the secondary construction side (right side in the figure) is connected to the primary construction side (left side in the figure) where the end of the PC steel material 10 already buried in the concrete is fixed.

[0003] On the primary construction side, a tensioned PC steel material 10 is buried in a concrete structure, and an end of the PC steel material is held by a male cone 11 and a female cone 12 to anchor plates 15.
Has been established.

On the secondary construction side, first, a cylindrical coupler 30
Then, the sheath 50 and the sheath cap 60 are passed through the outer periphery of the PC steel material 20. Subsequently, the male cone 21 and the female cone 22 are attached to the end of the PC steel material 20 in the same manner as the primary construction side.

A female screw is formed on the inner surface of one end of the coupler, and the female screw is screwed into a male screw formed on the outer periphery of the female cone 12 on the primary working side. The other end side of the coupler has a smaller inner diameter, and presses the female cone 22 on the secondary construction side to the primary construction side with the screwing of the coupler 30, and the PC steel material 10 on the primary construction side and the PC steel material 20 on the secondary construction side Is connected.

[0006] A sheath 50 is arranged on the outer periphery of the coupler 30,
One end of the sheath contacts the anchor plate 15, and the sheath cap 60 is fitted to the other end (secondary construction side). The sheath cap 60 is an annular member having a PC steel material insertion hole formed at the center and a resin filling hole 63. Then, between the sheath 50 and the anchor plate 15, the sheath 50 and the sheath cap 60
And between the sheath cap 60 and the resin coating of the PC steel material 20, the resin is injected from the resin filling hole 63, and the space between the coupler 30 and the sheath 50 is filled with the resin.

[0007]

However, in the above-described coupler structure, it is conceivable that on-site work is complicated and connection reliability is insufficient.

[0008] The work of attaching a male cone and a female cone to the end portion of a PC steel material is performed at a site where the PC steel material is connected. Normally, the male cone is a conical metal piece that can be divided into a plurality of pieces. If the metal pieces are displaced when attached to the female cone, the reliability of fixing may be impaired. Also,
It is also conceivable that the male cone on the secondary construction side may come off from the female cone after the coupler is screwed into the female cone on the primary construction side, and there is no special accessory for confirming whether the connection has been made securely.

Further, the sheath cap has an integral structure, and what has previously been fitted to the outer periphery of the secondary construction side PC steel material must be brought to the primary construction side by hand, resulting in poor workability.

[0010] Accordingly, a main object of the present invention is to provide a coupler structure for connecting a PC steel material excellent in workability and connection reliability. Another object of the present invention is to provide an end structure of a PC steel material and a sheath cap used in the coupler structure for connecting a PC steel material.

[0011]

According to the present invention, the above object is attained by combining a male cone or a female cone at the end of a PC steel material in advance and using a split sheath cap.

That is, the coupler structure for connecting a PC steel material according to the present invention comprises a pair of fixing portions formed by fitting a male cone holding a PC steel material into a female cone, a coupler connecting both fixing portions, and a sheath covering the outer periphery of the coupler. And a coupler structure for connecting a PC steel material, comprising a sheath cap attached to a sheath end face. Here, a holding plate for preventing the male cone from coming off from the female cone is disposed on the end surface of the male cone. The sheath cap is an annular body, and can be divided into a plurality of arc pieces. Further, a spacer may be interposed between both fixing portions.

[0013] The present invention is also characterized by constituent members used in the above coupler structure.

That is, the end structure of the PC steel material of the present invention is PC
A steel material, a female cone into which the end of the PC steel material is inserted, a male cone that grips the end of the PC steel material and is fitted into the female cone, and a holding plate that is disposed on the end surface of the male cone and prevents the male cone from coming off from the female cone. It is characterized by comprising.

Further, the sheath cap of the present invention is an annular body attached to an end face of a sheath for connecting a PC steel material, and is characterized in that it can be divided into a plurality of arc pieces.

[0016] In this sheath cap, it is preferable that the joint surface of the adjacent arc pieces is provided with a convex portion and a concave portion which engage with each other. Due to the engagement between the projections and the depressions, the arc pieces of the sheath cap can be combined reliably and easily without causing a shift. The protrusions and recesses may be corrugated surfaces in addition to rod-shaped protrusions and fitting holes.

[0017] The male cone and the female cone are securely combined with the end of the PC steel material at a factory or the like in advance, and the male cone is prevented from coming off by the pressing plate, so that the fixing section mounting work at the connection site can be omitted.

The holding plate prevents the male cone from coming off the female cone before and after the connection of the PC steel material, and can realize a reliable fixing structure.

If a spacer is interposed between the fixing sections on the primary construction side and the secondary construction side in the coupler, it also contributes to preventing the male cone from coming off. The spacer reduces the space in the coupler, thereby reducing the air (oxygen) remaining in the space and improving the corrosion resistance.

In the conventional sheath cap, it was necessary to pass the steel material in advance. However, the split structure of the sheath cap makes it easy to connect the PC steel material on the primary construction side and the secondary construction side and then from the outer peripheral side of the PC steel material. Can be attached to

[0021]

Embodiments of the present invention will be described below. (Outline of Coupler Structure) FIG. 1 is a partial sectional view of the coupler structure of the present invention. This coupler structure consists of a PC steel material on the primary construction side (left side in the figure) and a secondary construction side (right side in the figure) that fix the end of the PC steel material 10 already buried in concrete.
This is a structure in which 20 is connected using a coupler 30.

(Primary construction side) On the primary construction side, a tensioned PC steel material 10 is buried in a concrete structure, and a fixing portion in which a male cone 11 and a female cone 12 are attached to the end of the PC steel material is attached to an anchor plate 15. Has been established.

Male cone 11 and female cone 12 on the primary construction side
2 is shown in FIG. The male cone 11 is a conical metal piece that can be divided into a plurality of pieces, and has a groove in which a PC steel material is fitted in the axial direction.

The female cone 12 is combined with a cone to form a PC.
It is a cylindrical body having a conical hole into which the male cone 11 holding a steel material is inserted. On the outer peripheral surface of the female cone 12, a male screw 12A into which a coupler 30 described later is screwed is formed.

As shown in FIG. 3, the anchor plate 15 is a rectangular plate 15A arranged on the end face of the concrete structure.
The guide tube 15B is welded to the surface of the guide tube.

As the PC steel material 10, for example, a stranded wire obtained by twisting a plurality of strands, coated with an epoxy resin, and further coated with polyethylene (for example, Sumitomo Electric Industries: After Bond “registered trademark”) can be used. Since the surface of the polyethylene resin is formed into an uneven shape, high adhesive strength to concrete can be obtained. PC steel material on the secondary construction side described later
20 is the same as the PC steel 10.

(Secondary construction side) The secondary construction side is also the male cone 21
And a fixing portion in which a female cone 22 is attached to an end of the PC steel material 20. This fixing unit is assembled not in the field but in a factory or the like in advance. Simply grasping the PC steel material 20 with the male cone 21 and fitting the PC steel material 20 into the female cone 22 may cause the male cone 21 to fall off during transportation of the PC steel material 20 or the like. Therefore, as shown in FIG.
The holding plate 23 is fixed to the female cone 22 with bolts 24 to prevent the male cone 21 from falling off.

The holding plate 23 is an annular metal plate having an outer diameter larger than the maximum outer diameter of the male cone 21 and an inner diameter smaller than the maximum outer diameter of the male cone 21. When the holding plate 23 is coaxially arranged on the end face of the male cone 21, the holding plate protrudes from the male cone 21 to the outer peripheral side. A bolt through hole is provided at the protruding part, a bolt screw hole is also formed at the end face of the female cone 22, and the screw 24 is screwed in.
By fixing the female cone 22 to the female cone 22, the male cone 21 can be reliably prevented from coming off. Since the mounting of the male cone 21 to the PC steel material 20 and the fitting of the male cone 21 to the female cone 22 are all performed under proper quality control in the factory, the problem that the male cone 21 is shifted with respect to the female cone 22 can be solved.

(Coupler) The coupler 30 covers and connects the fixing part on the primary working side and the fixing part on the secondary working side. The coupler 30 has a female screw 31 on the inner circumference on one end and the inner diameter on the other end. Is a cylindrical body having a small diameter portion 32 (FIG. 5). The female screw 31 corresponds to the male screw 12A of the female cone on the primary construction side.
The small-diameter portion 32 at the other end is formed to have an inner diameter larger than the outer diameter of the PC steel material 20 and smaller than the outer diameter of the female cone 22. Such a coupler 30 is fitted in the PC steel material 20 on the secondary construction side in advance.

(Spacer) A spacer 40 is disposed between the fixing part on the primary construction side and the fixing part on the secondary construction side. This spacer 40
Is a cylindrical member of a size sandwiched between the male cone 11 on the primary construction side and the bolt 24 on the secondary construction side (FIG. 6).
It is preferable to use an elastic material such as rubber. In this example, the spacer 40 is used. However, even without the spacer 40, it functions without any problem as a coupler structure.

(Sheath) A cylindrical sheath 50 is fitted around the outer periphery of the coupler 30. Coupler with this sheath 50
Since a resin is later filled into the gap with 30, the resin is preferably made of a transparent or translucent material so that the filling state of the resin can be easily seen from the outside. In this example, transparent polyethylene was used, but vinyl chloride can also be used.

The sheath 50 is provided with a resin discharge hole 51 (FIG. 7). Use of an acrylic resin or the like as the transparent material for the sheath may be considered. However, the acrylic resin is less flexible than the polyethylene resin, and cracks are easily generated when the discharge hole 51 is formed. Further, the same material as the sheath cap 60 described later facilitates the adhesion of the two.

(Sheet Cap) A sheath cap 60 is fitted into the end of the sheath 50 (secondary construction side). The sheath cap 60 is an annular member having a joint portion 61 to the sheath protruding at one end and a penetrating portion 62 made of PC steel protruding at the other end (FIG. 8). Further, a resin filling hole 63 is provided. In the present embodiment, the sheath cap 60 is of a split type divided into two arc pieces. A pair of rod-shaped protrusions on the joint surface of one arc piece
64, and a pair of fitting holes 65 into which the rod-shaped projections 64 are fitted. By fitting the rod-shaped projection 64 into the fitting hole 65, the annular sheath cap 60 can be formed easily and reliably by combining the arc pieces. In this embodiment, the sheath cap is made of polyethylene, but vinyl chloride or the like may be used.

(Procedure for Assembling Coupler Structure) (1) The excess length of the fixing part on the primary construction side where the tension and fixing have been performed is cut from the end face of the female cone 12 to an appropriate length (for example, 30 mm) (FIG. 9). A grinder is used for cutting.

(2) The coupler 3 is attached to the PC steel material 20 on the secondary construction side.
Prepare a product in which 0 is fitted in advance and male and female cones are attached to the ends and fixed with a holding plate. this
The sheath 50 is also fitted on the outer periphery of the PC steel material.

(3) A spacer 40 is provided inside the coupler 30.
And screw the female screw 31 of the coupler into the male screw 12A of the female cone on the primary construction side (Fig. 10). By this screwing, the inner end face of the coupler small diameter portion 32 presses the end face of the secondary construction side female cone 22, and compresses the spacer 40 between the end face of the primary construction side male cone 11 and the secondary construction side bolt 24.

(4) An adhesive is applied to the outer periphery of one end of the sheath (FIG. 11). Then, one end of the sheath is inserted into the guide tube 15B of the anchor plate, and the sheath 50 and the guide tube 15B are connected with the tape 70 (FIG. 12). At this time, the resin discharge hole 51
The orientation of the sheath 50 is arranged so that the is directed upward.

(5) Outer circumference of other end of sheath and sheath cap 60
An adhesive is applied to the inner surface of the joint at (2) (FIG. 13). PC
The two arc pieces of the sheath cap 60 are combined from the outer periphery of the steel material, and the rod-shaped projection on the joint surface is fitted into the fitting hole, and the sheath cap 60 is attached to the other end of the sheath. Sheath cap 60
Is mounted so that the resin filling hole 63 is located below.

(6) Subsequently, a tape 72 is wound between the sheath 50 and the joint portion 61 of the sheath cap. Further, a gap between the insertion portion 62 of the PC steel material in the sheath cap 60 and the polyethylene resin coating of the PC steel material 20 is filled with a sealing material 74, and then a tape 75
(Fig. 14).

(7) After confirming that the applied adhesive and the filled sealing material 74 have hardened, a pump nozzle 81 is connected to the resin filling hole 63 via a vinyl hose 80, and the resin is injected into the sheath ( (Figure 15). At this time, the filling state of the resin can be confirmed from outside the transparent sheath 50.

(8) It is confirmed that the gap between the sheath 50 and the coupler 30 is completely filled with the resin and the resin is discharged from the discharge hole 51. By injecting the resin from the lower filling hole 63 and overflowing the resin from the upper discharging hole 51, the gas inside can be easily discharged, and the resin is reliably filled.

(9) While binding the vinyl hose 80,
Set the discharge hole stopper 82 and press it with tape (Fig. 1
6).

[0043]

As described above, according to the coupler structure of the present invention, since the work of holding the PC steel material with the male cone and fitting it into the female cone is performed in the factory, the on-site work can be omitted, and the reliable coupler structure can be achieved. Can be realized.

Further, by attaching the holding plate and the rubber spacer, a structure in which the male cone does not come off can be realized.

Further, by dividing the sheath cap, the PC steel material on the primary construction side and the secondary construction side are connected to each other.
It can be easily installed from the outer periphery of PC steel.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of the coupler structure of the present invention.

FIG. 2 is a partial sectional view of a male cone and a female cone on a primary construction side.

3A is a plan view of an anchor plate, and FIG. 3B is a partial sectional view thereof.

FIG. 4 is a partial sectional view of a male cone and a female cone on the secondary construction side.

5A is a partial sectional view of a coupler, and FIG. 5B is an end view thereof.

FIG. 6A is an end view of a spacer, and FIG. 6B is a partial sectional view thereof.

FIG. 7 is a partial sectional view of a sheath.

FIG. 8A is an end view of a sheath cap, and FIG. 8B is a partial sectional view thereof.

FIG. 9 is an explanatory view showing an end of a primary construction side PC steel material.

FIG. 10 is an explanatory diagram showing a state in which the coupler is mounted on the primary construction side.

FIG. 11 is an explanatory diagram when a sheath is attached to an anchor plate.

FIG. 12 is an explanatory view of a state in which a sheath is attached to an anchor plate and taping is performed.

FIG. 13 is an explanatory diagram when a sheath cap is attached to a sheath.

FIG. 14 is an explanatory diagram of a state in which a sheath cap is attached to a sheath and taping is performed.

FIG. 15 is an explanatory diagram showing a state where a pump nozzle is connected to a sheath cap.

FIG. 16 is an explanatory diagram of a coupler structure after resin filling is completed.

FIG. 17 is a partial cross-sectional view of a conventional coupler structure.

[Explanation of symbols]

 10 PC steel material 11 Male cone 12 Female cone 12A Male screw 15 Anchor plate 15A rectangular plate 15B Guide cylinder 20 PC steel material 21 Male cone 22 Female cone 23 Holding plate 24 Bolt 30 Coupler 31 Female screw 32 Small diameter part 40 Spacer 50 Sheath 51 Discharge hole 60 Sheath cap 61 Joining part 62 Insertion part 63 Resin filling hole 64 Rod protrusion 65 Fitting hole 70 Tape 72 Tape 74 Seal material 75 Tape 80 Vinyl hose 81 Pump nozzle 82 Discharge hole plug

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Sakanaka 1-1-1, Konokita, Itami-shi, Hyogo Sumitomo Electric Industries, Ltd. Itami Works (72) Inventor Toshihiko Niki 1-chome, Koyo-Kita, Itami-shi, Hyogo No. 1-1 F-term in Sumitomo Electric Industries, Ltd. Itami Works (reference) 2E164 AA02 AA31 DA01 DA23 3J039 AA01 BB01 CA01 DA01 DA03 DA05

Claims (5)

[Claims] 1. A pair of fixing portions formed by fitting a male cone holding a PC steel material into a female cone, a coupler connecting the fixing portions, a sheath covering the outer periphery of the coupler, and a sheath cap attached to a sheath end surface. With
A coupler structure for connecting a PC steel material, wherein a holding plate for preventing a male cone from coming off from a female cone is disposed on an end face of the male cone, and the sheath cap is an annular body, which can be divided into a plurality of arc pieces. Coupler structure for PC steel connection. 2. The coupler structure for connecting a PC steel material according to claim 1, wherein a spacer is further interposed between the two fixing portions. 3. A PC steel material, a female cone into which an end of the PC steel material is inserted, a male cone to be gripped at an end of the PC steel material and fitted into the female cone, Characterized by having a holding plate for preventing
PC steel end structure. 4. A sheath cap to be attached to an end surface of a sheath for connecting a PC steel material, wherein the sheath cap is an annular body and can be divided into a plurality of arc pieces. Sheath cap. 5. The sheath cap for connecting a PC steel material according to claim 4, wherein the joint surface of the adjacent arc pieces has a convex portion and a concave portion which engage with each other.