JP2001317161A - Device for pressing in strand and wedge for coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the labor and time, and to lower the cost by eliminating a large facility in the conventional press-in work for pressing a wedge and a PC steel strand wire into a socket by hitting a wedge end a surface with a hammer before starting the concrete placing or using a large press-in machinery provided in a factory or carried into a field. SOLUTION: A device for pressing in a strand and wedge for coupler is provided with a socket support base, in which the center axis of the socket coincides with the center axis of a piston of a hydraulic jack when the hydraulic jack and the socket, in which a PC steel strand wire and the wedge are loosely fitted, are placed in a framework formed of wall in four directions thereof. The walls forming the framework are provided with a notch opened in an upper part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupler strand and a wedge press-fitting device for attaching a coupler to a PC steel strand in a prestressed concrete method.

[0002]

2. Description of the Related Art The connection of a PC steel strand is made by facing a pair of PC steel strands each having a socket at the end, and screwing a thread of a connection joint into a thread provided with the socket. In this case, a typical method of attaching a socket to the end of a PC steel stranded wire is to attach a tapered hole provided on the inner surface of the socket to a PC steel stranded wire inserted into the hole. There is a method of press-fitting a wedge therebetween, and various couplers have been provided for that.

[0003]

However, the work of press fitting a wedge and a PC stranded wire into the conventional socket is performed by hitting the end face of the wedge with a hammer before starting concrete driving work at a construction site. do it,
It was performed as a heavy work involving sweating. In addition, the press-fitting operation has been performed on a large scale using a large-sized press-fitting machine installed in a factory or carried into a site. Therefore, a large amount of labor, time, and large-sized equipment are required, and the cost is high.

Accordingly, an object of the present invention is to provide a coupler strand and a wedge press-fitting device which can easily attach a socket to an end of a PC stranded wire at a construction site.

[0005]

Means for Solving the Problems The present invention solves the above problems, and is a coupler strand and a wedge press-fitting device having the following configurations. (1) Hydraulic jacks in a frame body with four laps
A strand for a coupler, comprising: a socket support base on which a center axis of a socket coincides with a center axis of a piston of a hydraulic jack when a socket in which a PC steel stranded wire and a wedge are loosely fitted and mounted is mounted. And wedge press-fitting device. (2) Hydraulic jacks inside a frame with four walls
When a PC steel stranded wire and wedge are loosely fitted and fitted with a socket and a push cap that allows the end of the strand and the wedge to be pushed into the tapered hole of the socket at the same time, the center axis of the socket is the hydraulic jack piston. A strand for a coupler and a wedge press-fitting device, comprising a socket support that coincides with a central axis of the coupler. (3) When a notch groove that opens upward is provided in a wall constituting the frame, and a PC stranded wire portion extending from the socket is placed on the bottom surface of the groove, the PC stranded wire in the socket is cut off. (1) or (2), wherein the notch groove is provided at a position where the center coincides with the center axis of the piston of the hydraulic jack.
5. A strand and wedge press-fitting device for a coupler as described in 1. above. (4) The coupler strand and wedge press-fitting device according to any one of (1) to (3) above, wherein a carrying handle is attached to an outer surface of the frame. (5) The coupler strand as described in any one of (1) to (4) above, wherein the cutout groove is a U-shape having a bottom surface on which a PC steel wire is placed. Wedge press-fitting device.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a strand and a wedge press-fitting device for a coupler according to an embodiment of the present invention, FIG. 2 is a longitudinal longitudinal sectional view of the strand and a wedge press-fitting device during use, and FIG. It is a perspective view of the state in use. In the figure, A is a strand and wedge press-in device for couplers, and B is a PC
Steel strands, C is a socket, D is a wedge. Also,
1 is a frame, 2 is a side wall, 3 is an end wall, 4 is a socket support,
5 is a notch groove, 6 is a handle, 7 is a hydraulic jack, 8 is a piston, 9 is a joint, and 10 is a push cap.

As shown in FIGS. 1 and 3, a coupler strand and wedge press-fitting device A according to an embodiment of the present invention comprises left and right side walls 2, 2 having transport handles 6, 6 on the outer surface, and front and rear end walls 3, 3. And a hydraulic jack (not shown) connected to a hydraulic pump (not shown) via a joint 9 inside one end wall 3 of the frame 1. 7 is mounted, and inside the other end wall 3,
The socket support 4 having a V-shaped cross section is attached by welding so that the center axis of the socket B coincides with the center axis of the piston 8 of the hydraulic jack 7 when the socket B is placed. It is preferable to use a structural carbon steel or a structural alloy steel as a material of the frame 1, but in order to reduce the weight, it is preferable to use titanium or its alloy having high mechanical strength and light weight. Can be.

Further, the side wall 3 provided with the socket support 4
A U-shaped notch groove 5 which opens upward and has a bottom surface on which a PC steel stranded wire is placed, is provided with a PC steel stranded wire.
The center of the steel stranded wire is determined and provided so as to coincide with the center axis of the piston 8 of the hydraulic jack 7.

In FIG. 1 and FIG. 2, reference numeral 10 denotes a push cap attached to the coupler strand and the wedge press-fitting device A. A hole 10a for receiving an end of the PC steel stranded wire B is provided on one end surface. A mark for confirming the insertion amount of the push cap 10 is provided on the peripheral surface. Further, the annular end face 10a contacts the wedge end face Da, and the wedge D
In the socket. In addition, PC
The bottom surface 10c of the hole for receiving the end of the steel strand B is PC
By contacting the end of the steel strand strand B, the end and the end face of the wedge can be simultaneously pushed into the tapered hole of the socket.

Next, referring to FIGS. 1 and 2, a description will be given of a process of attaching a coupler to a PC stranded wire using the coupler strand and the wedge press-fitting device A having the above-described configuration. (1) The socket D having the wedge C surrounding the strand B of PC steel is mounted on the socket support 4. (2) The push cap 10 is attached between the piston ton 8 and the wedge D. (3) The piston 8 of the hydraulic jack 7 is extended to the full stroke, and the wedge D is pressed and pushed. (4) The pressure of the hydraulic jack 7 is reduced to return the piston 8 to the zero stroke state. (5) Piston 8 and push cap 10 of hydraulic jack 7
A push plate (not shown) is inserted between the hydraulic jacks 7.
Is pressed to extend the piston 8. (6) Push cap 10 is marked on socket B
The pressurization of the hydraulic jack 7 is stopped when it matches the end. (7) Reduce the pressure of the hydraulic jack 10 to return the stroke of the piston 8 to zero. When the steps (1) to (7) are completed, the wedge D and the socket C are fixed to the ends of the PC stranded wire B with a desired fastening force. By using the coupler strand and wedge press-fitting device of the present invention, the strand end and the wedge end face can be simultaneously pushed into the tapered hole of the socket. Therefore, the wedge teeth can bite normally without shaving the surface of the strand, and the danger of the strand slipping during the subsequent cable tensioning operation can be further reduced.

In the above step (5), the push plate inserted between the hydraulic jack 7 and the push cap 10 is not essential, but the coupler strand and the wedge press-fitting device of the present invention can improve portability. As a result of adopting a small hydraulic jack in order to reduce the size of the device in consideration, the stroke of the piston, that is, the amount of press-fit of the wedge is limited, which is useful for assisting the amount of press-fit of the wedge. .

[0012]

According to the present invention, the apparatus according to the present invention
Since C steel strands can be inserted and removed from above, they can be used easily, and can also be used for already installed PC steel strands. And the center of the piston of the hydraulic jack and the center of the PC stranded wire can be easily and reliably matched with each other,
Since the hydraulic pressure is not wasted, and the pressing force acts evenly on the wedge, a reliable tightened state can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a strand for a coupler and a wedge press-fitting device of the present invention.

FIG. 2 is a longitudinal sectional view of the coupler strand and wedge press-in device of the present invention in use.

FIG. 3 is a perspective view of a state in which a strand for a coupler and a wedge press-fitting device are used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Coupler strand and wedge press-fitting device 1 Frame 2 Side wall 3 End wall 4 Socket support 5 Groove 6 Handle 7 Hydraulic jack 8 Piston 9 Joint 10 Push cap 10a Annular end face 10b Accepts end of PC steel strand B Hole 10c Bottom of hole for receiving end of PC steel strand B B PC strand strand C Socket D Wedge Da Wedge end face

Claims (5)

[Claims] 1. When a hydraulic jack and a socket in which a PC steel stranded wire and a wedge are loosely fitted and mounted are placed in a frame having four walls formed of walls, the center axis of the socket is the piston of the hydraulic jack. A strand and a wedge press-fitting device for a coupler, comprising a socket supporting base coinciding with a central axis. 2. A hydraulic jack, a socket in which a PC steel stranded wire and a wedge are loosely fitted and fitted, and a strand end and a wedge end face are simultaneously pushed into a tapered hole of the socket in a frame having four walls formed of walls. A strand and wedge press-fitting device for a coupler, characterized in that a socket support is provided in which a center axis of a socket coincides with a center axis of a piston of a hydraulic jack when a press cap capable of being press-fitted is placed. 3. A notch groove which is opened upward is provided on a wall constituting a frame, and a P extending from a socket is formed on a bottom surface of the groove.
The notch groove is provided at a position where the center of the PC steel strand in the socket coincides with the central axis of the piston of the hydraulic jack when the C steel strand is placed. A strand and wedge press-fitting device for a coupler as described in the above. 4. The coupler strand and wedge press-fitting device according to claim 1, wherein a transport handle is attached to an outer surface of the frame. 5. A notch groove having a U-shape having a bottom surface on which a strand of PC steel wire is placed for mounting is provided.
The strand and wedge press-fitting device for a coupler according to any one of the above.