JP4357729B2 - Coupler structure for connecting PC steel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coupler structure for connecting a PC steel material used in a prestressed concrete method, an end structure of a PC steel material used in this coupler structure, and a sheath cap.
[0002]
[Prior art]
PC steel is connected by a coupler structure in bridges using the outer cable method. FIG. 17 is a partial cross-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) that fixes the end of the PC steel material 10 already embedded in the concrete.
[0003]
On the primary construction side, a strained PC steel material 10 is embedded in the concrete structure, and the ends of the PC steel material are held by the male cone 11 and the female cone 12 and fixed to the anchor plate 15.
[0004]
On the secondary construction side, first, the cylindrical coupler 30, 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.
[0005]
A female screw is formed on the inner surface of one end of the coupler, and this female screw is screwed into a male screw formed on the outer periphery of the female cone 12 on the primary construction side. The other end side of the coupler is configured to have a small inner diameter, and as the coupler 30 is screwed in, the female cone 22 on the secondary construction side is pressed to the primary construction side, 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]
The sheath 50 is disposed on the outer periphery of the coupler 30, one end of the sheath is brought into contact with 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 insertion hole formed at the center and a resin filling hole 63. Then, between the sheath 50 and the anchor plate 15, between 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, The space between the coupler 30 and the sheath 50 is filled with resin.
[0007]
[Problems to be solved by the invention]
However, with the coupler structure described above, there are cases where field work is complicated and connection reliability is insufficient.
[0008]
The work of attaching male and female cones to the edge of PC steel is done at the site where PC steel is connected. Usually, the male cone is a conical metal piece that can be divided into a plurality of pieces, and if the metal pieces are displaced when attached to the female cone, the reliability of fixing may be impaired. Further, it is conceivable that after the coupler is screwed into the female cone on the primary construction side, the male cone on the secondary construction side may come off from the female cone, and there is no dedicated accessory for confirming whether the connection has been made reliably.
[0009]
Furthermore, the sheath cap has an integral structure, and it is inferior in workability because it has to be brought to the primary construction side after being previously fitted in the outer periphery of the PC steel material on the secondary construction side.
[0010]
Therefore, a main object of the present invention is to provide a coupler structure for connecting a PC steel material that is 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 this coupler structure for connecting a PC steel material.
[0011]
[Means for Solving the Problems]
The present invention achieves the above object by combining a male cone and a female cone in advance with a PC steel material end and making the sheath cap split.
[0012]
That is, the coupler structure for connecting a PC steel material according to the present invention includes a pair of fixing parts configured by fitting a male cone holding a PC steel material into a female cone, a coupler for connecting both fixing parts, a sheath covering the outer periphery of the coupler, and a sheath It is a coupler structure for connecting PC steel, which includes a sheath cap attached to the end face. Here, a holding plate for preventing the male cone from coming off from the female cone is disposed on the end face of the male cone. The sheath cap is an annular body and can be divided into a plurality of arc pieces. Furthermore, a spacer may be interposed between the fixing portions.
[0013]
The present invention is also characterized by the structural members used in the coupler structure.
[0014]
That is, the end structure of the present invention PC steel is arranged on the end surface of the PC steel, the female cone through which the end of the PC steel is inserted, the male cone that holds the end of the PC steel and is fitted into the female cone, and the male cone. And a presser plate that prevents the male cone from coming off from the female cone.
[0015]
In addition, the sheath cap of the present invention is an annular body attached to the end surface of the PC steel material connection sheath, and can be divided into a plurality of arc pieces.
[0016]
In this sheath cap, it is preferable that the joining surface of the adjacent arc pieces has a convex portion and a concave portion that engage with each other. Due to the engagement between the convex portion and the concave portion, the arc pieces of the sheath cap can be combined reliably and easily without causing a shift. The convex portion and the concave portion may be corrugated surfaces other than rod-like protrusions and fitting holes.
[0017]
By attaching the male cone and female cone to the end of the PC steel in advance at the factory, and preventing the male cone from coming off with the presser plate, the fixing work at the connection site can be omitted.
[0018]
The presser plate prevents the male cone from coming out of the female cone before and after connecting the PC steel material, and can realize a reliable fixing structure.
[0019]
In the coupler, when a spacer is interposed between the fixing portions on the primary construction side and the secondary construction side, it contributes to prevention of the male cone from coming off. In addition, the spacer reduces the space in the coupler, thereby reducing the air (oxygen) remaining in the space and improving the corrosion resistance.
[0020]
In the conventional sheath cap, it was necessary to pass the steel material in advance, but by connecting the PC steel material of the primary construction side and the secondary construction side by connecting the sheath cap in a split structure, it can be easily attached from the outer periphery side of the PC steel material be able to.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
(Outline of coupler structure)
FIG. 1 is a partial cross-sectional view of the coupler structure of the present invention. This coupler structure uses a coupler 30 to connect the PC steel 20 on the secondary construction side (right side of the figure) to the primary construction side (left side of the figure) that fixes the end of the PC steel 10 already embedded in the concrete. It is a structure to do.
[0022]
(Primary construction side)
On the primary construction side, a strained PC steel material 10 is embedded in the concrete structure, and a fixing portion in which the male cone 11 and the female cone 12 are attached to the end portion of the PC steel material is fixed to the anchor plate 15.
[0023]
FIG. 2 shows a partial cross-sectional view of the male cone 11 and the female cone 12 on the primary construction side. The male cone 11 is a conical metal piece that can be divided into a plurality of pieces, and has a groove into which a PC steel material is fitted in the axial direction.
[0024]
The female cone 12 is a cylindrical body having a conical hole into which the male cone 11 holding a PC steel material in a conical shape 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.
[0025]
As shown in FIG. 3, the anchor plate 15 is obtained by welding a guide tube 15B to the surface of a rectangular plate 15A disposed on the end surface of the concrete structure.
[0026]
As the PC steel material 10, for example, an epoxy resin coated on a stranded wire obtained by twisting a plurality of strands and further coated with polyethylene (for example, manufactured by Sumitomo Electric: Afterbond “registered trademark”) can be used. Since the surface of the polyethylene resin is formed in a concavo-convex shape, high adhesion strength with concrete can be obtained. The PC steel material 20 on the secondary construction side to be described later is the same as the PC steel material 10.
[0027]
(Secondary construction side)
The secondary construction side also has a fixing portion in which the male cone 21 and the female cone 22 are attached to the end of the PC steel material 20. This fixing unit is not assembled at the site but assembled in advance in a factory or the like. If the PC steel material 20 is simply held by the male cone 21 and fitted into the female cone 22, the male cone 21 may fall off during the transportation of the PC steel material 20 or the like. Therefore, as shown in FIG. 4, a holding plate 23 is provided on the end surface of the male cone 21, and the holding plate 23 is fixed to the female cone 22 with a bolt 24 to prevent the male cone 21 from falling off.
[0028]
The presser 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 presser plate 23 is coaxially arranged on the end surface of the male cone 21, the presser plate protrudes to the outer peripheral side of the male cone 21. If a bolt through hole is provided at the protruding part and a bolt screw hole is formed on the end face of the female cone 22 and the bolt 24 is screwed in, the presser plate 23 is fixed to the female cone 22 and the male cone 21 is removed. It can be surely prevented. The fitting of the male cone 21 to the PC steel material 20 and the fitting to the female cone 22 are all performed under proper quality control in the factory, so that the problem that the deviation of the male cone 21 from the female cone 22 occurs can be solved.
[0029]
(Coupler)
The coupler 30 covers and connects the fixing portion on the primary construction side and the fixing portion on the secondary construction side, and has a female screw 31 on the inner periphery on one end side and a small diameter portion 32 having a small inner diameter on the other end side. It is a provided cylindrical body (FIG. 5). The female screw 31 corresponds to the male screw 12A of the primary construction side female cone. The small diameter portion 32 on the other end side is formed to have an inner diameter that is 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.
[0030]
(Spacer)
A spacer 40 is disposed between the fixing portions on the primary construction side and the secondary construction side. The spacer 40 is a cylindrical member having a size that is 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, but even if the spacer 40 is not provided, it functions as a coupler structure without any trouble.
[0031]
(sheath)
A cylindrical sheath 50 is fitted on the outer periphery of the coupler 30. Since the gap between the sheath 50 and the coupler 30 is filled with resin later, it is preferable to use a transparent or translucent material so that the resin filling state can be easily seen from the outside. In this example, transparent polyethylene is used, but vinyl chloride can also be used.
[0032]
The sheath 50 is provided with a resin discharge hole 51 (FIG. 7). The use of an acrylic resin or the like as a transparent material for the sheath is conceivable. However, the acrylic resin is less flexible than the polyethylene resin, and cracks are easily generated when the discharge holes 51 are formed. Furthermore, the same material is used for the sheath cap 60, which will be described later.
[0033]
(Sheath 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 in which a joining portion 61 to the sheath is projected on one end side, and a PC steel insertion portion 62 is projected on the other end side (FIG. 8). Furthermore, a resin filling hole 63 is also provided. In this example, the sheath cap 60 is divided into two arc pieces. One arc piece has a pair of rod-like protrusions 64 on the joining surface, and the other arc piece has a pair of fitting holes 65 into which the rod-like protrusions 64 are fitted. By fitting the rod-like protrusion 64 into the fitting hole 65, the annular sheath cap 60 can be configured easily and reliably by combining the arc pieces. In this example, the sheath cap is made of polyethylene, but vinyl chloride or the like can also be used.
[0034]
(Assembly procedure of coupler structure)
(1) Cut the extra length of the fixing portion on the primary construction side where the tension and fixing are performed to an appropriate length (for example, 30 mm) from the end face of the female cone 12 (FIG. 9). A grinder is used for cutting.
[0035]
(2) Prepare a coupler 30 fitted in advance to the PC steel material 20 on the secondary construction side and fitted with a male cone and a female cone at the end and fixed with a presser plate. A sheath 50 is also fitted on the outer periphery of the PC steel material.
[0036]
(3) The spacer 40 is inserted into the coupler 30, and the female screw 31 of the coupler is screwed into the male screw 12A of the primary construction side female cone (FIG. 10). By this screwing, the inner end surface of the coupler small diameter portion 32 presses the end surface of the secondary construction side female cone 22 and compresses the spacer 40 between the end surface of the primary construction side male cone 11 and the secondary construction side bolt 24.
[0037]
(4) Apply adhesive to the outer periphery of one end of the sheath (Figure 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 sheath 50 is oriented so that the resin discharge hole 51 faces upward.
[0038]
(5) Adhesive is applied to the outer periphery of the other end of the sheath and the inner surface of the joint portion of the sheath cap 60 (FIG. 13). The two arc pieces of the sheath cap 60 are combined from the outer periphery of the PC steel material, and the sheath cap 60 is attached to the other end of the sheath by fitting the rod-shaped protrusion on the joint surface into the fitting hole. The sheath cap 60 is mounted so that the resin filling hole 63 is positioned below.
[0039]
(6) Subsequently, the tape 72 is wound between the sheath 50 and the joined portion 61 of the sheath cap. Further, a sealing material 74 is filled in a gap between the PC steel material insertion portion 62 in the sheath cap 60 and the polyethylene resin coating of the PC steel material 20, and then a tape 75 is wound (FIG. 14).
[0040]
(7) After confirming that the applied adhesive and the filled sealing material 74 are cured, the pump nozzle 81 is connected to the resin filling hole 63 via the vinyl hose 80, and the resin is injected into the sheath (FIG. 15). . At this time, the resin filling state can be confirmed from the outside of the transparent sheath 50.
[0041]
(8) Confirm that the gap between the sheath 50 and the coupler 30 is completely filled with 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 discharge hole 51, it is easy to discharge the internal gas, and the resin is reliably filled.
[0042]
(9) The vinyl hose 80 is bundled, and the discharge hole stopper 82 is set and pressed with tape (FIG. 16).
[0043]
【The invention's effect】
As described above, according to the coupler structure of the present invention, the work of gripping the PC steel material with the male cone and fitting it into the female cone is performed in the factory, so that the field work can be omitted and a reliable coupler structure can be realized.
[0044]
Moreover, the structure which a male cone does not remove | deviate by attaching a press plate and a rubber spacer is realizable.
[0045]
Furthermore, by making the sheath cap into a split type, it is possible to easily attach from the outer peripheral side of the PC steel after connecting the PC steel on the primary construction side and the secondary construction side.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a coupler structure of the present invention.
FIG. 2 is a partial cross-sectional view of a primary construction side male cone and a female cone.
3A is a plan view of an anchor plate, and FIG. 3B is a partial cross-sectional view thereof.
FIG. 4 is a partial cross-sectional view of a secondary construction side male cone and a female cone.
5A is a partial cross-sectional view of a coupler, and FIG. 5B is an end view thereof.
6A is an end view of a spacer, and FIG. 6B is a partial cross-sectional view thereof.
FIG. 7 is a partial cross-sectional view of a sheath.
8A is an end view of a sheath cap, and FIG. 8B is a partial cross-sectional view thereof.
FIG. 9 is an explanatory view showing an end portion of a primary construction side PC steel material.
FIG. 10 is an explanatory diagram showing a mounting state of the coupler 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 diagram of a state where 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 the sheath.
FIG. 14 is an explanatory view of a state where a sheath cap is attached to the sheath and taped.
FIG. 15 is an explanatory view showing a state in which a pump nozzle is connected to a sheath cap.
FIG. 16 is an explanatory diagram of a coupler structure after completion of resin filling.
FIG. 17 is a partial cross-sectional view of a conventional coupler structure.
[Explanation of symbols]
10 PC steel
11 Oscorn
12 female cone
12A male thread
15 Anchor plate
15A rectangular plate
15B Guide tube
20 PC steel
21 Oscone
22 female cone
23 Presser plate
24 volts
30 coupler
31 Female thread
32 Small diameter part
40 Spacer
50 sheath
51 Discharge hole
60 sheath cap
61 Joint
62 Insertion section
63 Resin filling hole
64 Rod projection
65 Mating hole
70 tapes
72 tapes
74 Sealing material
75 tapes
80 vinyl hose
81 Pump nozzle
82 Drain hole plug

Claims (2)

A PC comprising a pair of fixing parts configured by fitting a male cone holding a PC steel material into a female cone, a coupler connecting both fixing parts, a sheath covering the outer periphery of the coupler, and a sheath cap attached to the sheath end face It is a coupler structure for connecting steel materials,
On the end face of the male cone, a press plate for preventing the male cone from coming off from the female cone is arranged,
The sheath cap is annular body, Ri divided freely der into a plurality of arc pieces,
Furthermore , a coupler structure for connecting PC steel, characterized in that a spacer is interposed between both fixing parts .   The pressing plate is penetrated by a bolt and fixed to the female cone by screwing the bolt into the end surface of the female cone of one fixing tool.
  The coupler structure for connecting a PC steel material according to claim 1, wherein the spacer is interposed between the bolt and the male cone of the other fixing portion.

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