JP3520833B2 - Construction method of PC steel strand connection structure - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates to the construction method of the line connection structure PC strand in prestressed concrete construction method. 2. Description of the Related Art As a conventional PC steel stranded wire connector, a pair of left and right chuck bodies are screwed into a cylindrical coupler having screw portions threaded on inner walls at both ends, and the tapered fitting is performed. There is one in which a wedge divided in a part is fastened, and a stranded PC steel wire inserted from the left and right is fastened on the inner wall thereof. Then, a cylindrical susa is inserted into the inside of the cylindrical coupler, and conical springs are mounted on both sides of the intermediate partition plate so as to oppose each other, and each wedge is urged in a direction to be pushed into each tapered fitting portion. I have. Thus, the wedge receives the reaction force of the spring and is tightened by screwing the chuck body. Further, the cylindrical coupler and the intermediate partition plate are combined to form a circular hole opposed to the bottom wall in the axial direction with the bottom wall interposed therebetween, and a spring is attached to the hole so as to constitute the cylindrical coupler. There are also conventional PC steel stranded wire connectors. In the prestressed concrete method, however, tension is applied in the axial direction between the strands of PC steel, so that the divided wedges are aligned with the tapered fitting portion, and the strands of PC steel are straightened. And it must be securely gripped by the wedge. [0004] However, in the conventional PC steel stranded wire connector, when the PC steel stranded wire is inserted from the opening, the PC steel stranded wire on one side is usually two stranded wires.
It has a length of 0 m or more, it is difficult to insert while controlling the stranded wire straight, and it requires a large force, so the spring remains unevenly expanded and contracted by the bounce, and the wedge is not urged straight When the wedge tightens the PC steel stranded wire, the wedge sandwiches the PC steel stranded wire at the initial stage when the PC steel stranded wire is pulled, and enters into the taper part integrally with the wedge. The surface pressure due to the wedge action of the part must be sufficient to prevent slippage between the PC steel stranded wire and the inner wall of the wedge.
There is a problem that it cannot be confirmed until a tensile load of about 5% is applied. [0005] In order to discover the above-mentioned inconvenience state and to confirm the pinching action, it has conventionally been required to apply a pre-tension indicated by an arrow in the direction of the central axis to the PC stranded wire after the connection work. It requires equipment and the like, and it takes time and effort, resulting in a delay in work and an increase in work cost. [0006] Means for Solving the Problems The present invention aims to solve the above problems, the line connection structure PC strand following structure
It is a method of construction. (1) a cylindrical coupler having a threaded gripping portion at the center of the outer periphery and female screw portions screwed into inner walls on both left and right ends thereof;
A pair of left and right chuck bodies each having a male screw portion screwed with each of the female screw portions on the outer periphery of the front portion of the cylindrical body, and having a tapered fitting portion which is reduced in diameter toward the rear end inside the cylindrical body. When,
A split wedge that is fitted into the fitting portion of each of the chuck bodies and grips a PC steel stranded wire on an inner wall surface thereof;
A high-strength metal cylindrical body, which is interposed between the right wedge end surface and the left wedge end surface of each of the chuck bodies and is in contact with both end surfaces of the wedges, is connected to the PC using a PC wire connector. In the construction method of the PC steel stranded wire connection structure for completing the wire connection structure, first, a wire end portion and a wedge are inserted into the fitting portion of each of the chuck bodies with a high pressure from the PC to form a fixed object, then either the left or right immobilizates obtained in the first step, the high-strength metal tube body so as to have inner and line end than PC, and this
O-ring between the PC wire end and the high-strength metal cylinder
To provide an even gap between the two, and
A second step in which one end of the high-strength metal cylindrical body is brought into contact with the end face of the wedge of the compound and temporarily attached, and one of the immobilized substances obtained in the second step is obtained in the first step. The other fixed object is rotated in the screwing direction of the cylindrical coupler so that a high-strength metal cylinder is provided between the right wedge end face and the left wedge end face of each chuck body. A third step of contacting the surface with each other in a compressed state, and assuring that a slight gap is provided between the end portions of each of the PC strands. Construction method of wire connection structure. Next, an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a front sectional view showing a linear connection structure from PC connected to PC steel stranded wire according to the present invention embodiment, FIG 2 is an embodiment of the present invention, the line connection structure than the PC 1 FIG. 3 is a diagram illustrating a manufacturing process (construction process diagram) , and FIG. 3 is a diagram illustrating a process in which a wire end portion and a wedge are inserted into a fitting portion of a chuck body with a strong pressure from a PC to form a fixed object. As shown in the longitudinal sectional view of FIG. 1, the PC steel stranded wire connection structure of the present invention is provided with a gripping portion 11 for screwing at the center of the outer periphery of the member, and female screw portions 12, 12 'on both right and left sides thereof. And
It has a cylindrical coupler 1 having a female screw portion 13 at the center thereof, and male screw portions 21 and 21 'to be screwed with the female screw portions 12 and 12' on the outer periphery of the front portion of the cylindrical body. A pair of left and right chuck bodies 2, 2 'each having a tapered fitting portion 22 having a diameter reduced toward the rear end, and fitted into fitting portions 22, 22' of the chuck bodies 2, 2 '. Each of the chuck bodies 2 has a right wedge end surface 31 and a left wedge end surface 31 ′. A high-strength metal cylinder 5 is interposed between the end faces 31, 31 'of the wedges 3, 3' at their ends. And the high-strength metal cylinder 5
Have line ends 51, 51 'between the left and right PCs facing each other, and are provided with a slight gap s between the line ends 51, 51' of the PCs. The chuck body 2 has a rear end on the outer periphery of the cylindrical body.
May be provided with a quadrangular or hexagonal gripping portion so as to be easily screwed with a spanner or the like. The circular portion may be knurled and screwed with a pipe wrench. Next, the construction process will be described. First, using the tool shown in FIG. 3, the fitting portion (22) of each chuck body is inserted.
Then, the end of the wire 4 and the wedge 3 from the PC are fitted with high pressure to form an immobilized product. In FIG. 3A, the lower end surface of the chuck body 2 at the end of the PC stranded wire 4 covered with the sheath 7 (the part where the sheath 7 is stripped is gripped by the wedge 3 in the chuck body 2) is shown in FIG. After being supported by the support 9, the plunger 8 having the internal shape depression 81 that simultaneously presses the end face 31 of the wedge 3 and the wire end 51 from the PC is firmly pushed in and fixed, as shown in FIG. [0010] Thus the fixed product obtained, the high-strength metallic cylindrical member 5 so as to have inner and line end than PC, and is temporarily attached in contact with the end face of the wedge 3. On this occasion,
The O-ring 6 is interposed between the line 4 end and high strength metallic cylindrical member 5 from PC, it intends row provided a uniform gap therebetween. Next, the other fixed object is rotated in the screwing direction of the cylindrical coupler 1, and the high-strength metal cylinder 5 is inserted between the right wedge end face 31 and the left wedge end face 31 ′ of each chuck body 3. The wedges are interposed in a compressed state in contact with both end surfaces 31 and 31 'of each wedge so that a slight gap s is secured between the end portions of the PCs. The cylindrical coupler 1 may have a quadrangular or hexagonal gripping portion 11 at the center of the outer periphery of the member so as to be easily screwed with a spanner or the like. In addition, you may knurl a circular holding part and screw it with a pipe wrench. [0012] According to the present invention because it has a configuration and operation of the above, the connection work is easy easy. Further, inconveniences such as work delay and cost increase are eliminated.

P connecting a PC steel stranded wire according to the BRIEF DESCRIPTION OF THE DRAWINGS [Figure 1] Invention Example
FIG. 4 is a front cross-sectional view showing a C-strand connection structure. FIG. 2 is a manufacturing process diagram of the PC strand connecting structure of FIG. 1 showing an embodiment of the present invention . FIG. 3 is an explanatory view of a process of fitting a wire end portion and a wedge from a PC into a fitting portion of a chuck body with strong pressure to form a fixed object. [Description of Signs] 1: Cylindrical coupler, 2, 2, 2 ': pair of chuck bodies, 3, 3': wedge, 4, 4 ': PC steel stranded wire,
5: High-strength metal cylinder, 6: O-ring, 7: sheath, 8:
Plunger 9: support base, 11: gripper for screw connection, 12,
12 ': female screw part, 13: female screw part, 21, 21':
Male screw part, 22: tapered fitting part, 23: inner wall surface,
31, 31 ': wedge end face, 51, 51': PC strand end, s: slight gap

Continuation of the front page (56) References JP-A-51-28312 (JP, A) JP-A-7-18787 (JP, A) JP-A-7-18788 (JP, A) JP 6-54052 (JP) , B2) Tokiko Sho 50-38904 (JP, B1) Jiko 57-55850 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04C 5/08

Claims (1)

(1) A cylindrical coupler having a threaded gripping portion at the center of the outer periphery and female screw portions threaded on inner walls on both left and right sides thereof, and a cylindrical front portion. A pair of left and right chuck bodies each having an external thread portion screwed with each of the female screw portions on the outer periphery thereof, and having a tapered fitting portion which is reduced in diameter toward the rear end inside the cylindrical body; A split wedge that is fitted into the fitting portion of the chuck body and grips the PC steel stranded wire on its inner wall surface, and between the right wedge end surface and the left wedge end surface of each of the chuck bodies, at both end surfaces of the wedges. In the construction method of a PC steel stranded wire connection structure for completing a PC stranded wire connection structure using a PC stranded wire connection tool composed of a high-strength metal cylinder and interposed in contact with each other, first, each of the chuck bodies is fitted. The end of the wire from the PC and the wedge A first step of fitting with strong pressure to form an immobilized material, and then, in the immobilized material obtained in the first step, the high-strength metal cylindrical body has a wire end portion from PC , At this time, the wire end of the PC and the high-strength metal cylinder
An O-ring is interposed between the
The high-strength gold on the end face of the wedge of the immobilized material.
A second step of temporarily attaching the one end of the genus cylindrical body by contacting the cylindrical coupler, and fixing one of the immobilized substance obtained in the second step and the other immobilized substance obtained in the first step to the cylindrical coupler. By rotating in the screwing direction, between the right wedge end surface and the left wedge end surface of each chuck body, a high-strength metal cylinder comes into contact with both end surfaces of the wedges in a compressed state. A third step of connecting the PC steel stranded wire connection structure, wherein a third step is provided so that a slight gap is secured between the wire ends.