JP2576231Y2 - PC steel connector - Google Patents

Description

[Detailed description of the invention]

[Industrial application field] The present invention is applicable to Ps having the same diameter or different diameters.
The present invention relates to an improvement in a connector for securely connecting PC steel materials including a C steel wire and a PC steel stranded wire to each other.

2. Description of the Related Art PC steel materials are used for PC (prestressed concrete) girders having high bending strength, and those having a length exceeding 20 m are also manufactured. For example, as shown in FIG. 4, the PC girder manufacturing equipment is provided with a pair of retaining walls (abbats) 23 at a predetermined interval (for example, span 100 m) on the ground 21 and a pair of retaining walls. 23, one end of a plurality of PC steel strands 39 stretched in parallel to each other is fixed to one retaining wall 23 by fasteners 24, and the other end of the PC steel strand 39 is fixed to the other retaining wall 23. It is tensioned by the hydraulic tensioning machine 22 provided, and a predetermined tensile load (for example, P
20t) is applied in the case of a seven-strand C steel wire. The PC steel stranded wire 39 is cut into a predetermined length in advance, penetrated through various molds 28 to 30 assembled on each of the pedestals 25 to 27, connected to each other by the connector 10 according to the present invention, and then tightened. You. After the concrete was poured into each of the molds 28 to 30 and completely fixed, the tension of the PC steel stranded wire 39 was released and stress was introduced into the concrete. And formwork 28
30 are dismantled to obtain products (PC girder etc.) 41 to 43. In a conventional PC steel connection device, one PC steel material is set into a wedge held by a spring by pushing the one PC material into the connection device until the terminal abuts, and the other PC steel material is similarly connected at its end to the connection device. By pushing, the PC steel materials are integrally connected to each other. However, care must be taken in handling the fittings, since large tensile loads are transmitted to the fittings. In particular, even if the PC steel material is completely attached to the connector at the initial stage, the connection state inside the connector cannot be monitored. If the tension is applied while the steel material is not biting properly, slipping or disconnection may occur, which is extremely dangerous to the operator, and it takes time to re-attach. In general, many connecting members made of a PC steel material including a PC steel stranded wire are formed by processing a high-strength steel alloy into a cylindrical shape. It is considered necessary for the connecting device not only to emphasize strength safety but also to be small and light, so that the opening of the connecting device is only the insertion portion of the PC steel material. For this reason, in order to confirm the insertion length of the PC steel material into the connection tool, it is most effective to previously mark the PC steel material with a required length from the terminal. After the PC steel material is attached to the connection tool, it is sufficient if there is no change in the position of the mark, but if there is a change in the position of the mark, slipping has occurred. However, if the above means
Taking one by one for steel materials is extremely poor in practicality,
It is unsuitable for products using a large number of PC steels such as PC girders.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the object of the present invention is to provide a connector without adversely affecting strength.
The mounting state of C steel material can be checked directly with the eyes.
It is intended to provide a connection tool made of C steel.

In order to achieve the above-mentioned object, according to the structure of the present invention, a threaded rod is screwed into a screw hole provided at the base end of a pair of sleeve bodies, and each of the sleeves is integrally connected. A tapered conical hole is formed from the base end of the main body to the distal end side, and a conical wedge having a hole through which a PC steel material is inserted and divided into three in the circumferential direction is fitted into the conical hole, and the base of the wedge is formed. A spring is interposed between the end and the threaded rod, and a release sleeve that pushes back the wedge against the force of the spring is fitted at the tip of each sleeve body. A window hole for checking the condition of the PC steel material between the base end and the screw rod is provided.

After inserting one PC steel material to the end wall (abutting position) of the cylindrical portion of the connection tool, slightly return it, and confirm that the wedge securely holds the PC steel material. The other PC steel is connected similarly. Tension work is performed when both PC steels are united. At this time, if the window hole of the connection tool is placed in a position where it can be easily seen, tension is stopped when slippage occurs in the PC steel material, re-attachment can be carried out early, and it is carried out after applying a large tension. Is much more secure.

FIG. 1 shows a connector 10 for connecting PC steel stranded wires 39 having different outer diameters (only the lower sleeve body 2 is shown in the figure). The connecting device 10 according to the present invention includes a pair of sleeve bodies 2, a threaded rod 31 for connecting the two, and a wedge 12 for holding the end of the PC steel stranded wire 39 inside the sleeve body 2. The pair of sleeve bodies 2 are integrally connected by screwing a screw rod 31 into a screw hole 6 provided at the base end. Each sleeve body 2 is provided with a cylindrical portion 5, a conical hole 4, and a small-diameter cylindrical portion 3 in order toward the distal end, and the distal end of the cylindrical portion 3 is further reduced in diameter to form a step. The cylindrical part 3 has a release sleeve 16
And the flange 16a of the release sleeve 16 is configured to abut on the step at the tip of the cylindrical portion 3 so as not to come off. The conical hole 4 is fitted with a conical wedge 12 divided into three in the circumferential direction. The wedge 12 is provided at the shaft center with an insertion hole 13 having teeth for holding the PC steel strand 39 so as not to come off. In practice, the teeth of the insertion holes 13 are formed as screw holes having relatively sharp threads. The annular groove formed in the base end portion of the wedge 13, that is, in the outer peripheral surface of the large diameter portion, is formed by a cutout ring made of a wire spring or the like that elastically catches the three divided wedges 12 (FIG. 2) so as not to shift in the axial direction. 14 are engaged. Screw rod 31
The spring 15 is interposed between the spring seat 33 formed on the cylindrical portion 32 and the base end surface of the wedge 12. The wedge 12 is urged toward the distal end of the sleeve body 2 by the force of the spring 15. The inner diameters of the release sleeve 16 and the cylindrical portion 34 are slightly larger than the outer diameter of the stranded PC steel wire 39. In the illustrated embodiment, the screw rod 31
Are connected to each other by a small-diameter through-hole 36, but the through-hole 36 may not be provided. Figures 1 and 3
According to the present invention, as shown in FIG. 5, a window hole for checking whether or not the end of the PC steel stranded wire 39 is completely inserted to the end wall 35 of the cylindrical portion 34 is formed in the outer peripheral wall of the sleeve main body 2. ,
A window hole 7 communicating with the cylindrical portion 5 is provided, preferably a hole having an oval cross section. Next, the operation of the connector according to the present invention will be described. In order to fasten the PC steel strand 39 to the sleeve body 2, the release sleeve 16 is pushed into the conical hole 4,
The divided wedges 12 move radially outward, and the inner diameter of the insertion hole 13 can be expanded. Here, the end of the PC steel stranded wire 39 is inserted through the release sleeve 16, the insertion hole 13 of the wedge 12, and the spring 15 into the cylindrical portion 34, and when the release sleeve 16 is released when it comes into contact with the end wall 35, the spring 15 is released. As a result, the wedge 12 is strongly pushed into the conical hole 4, the inner diameter of the insertion hole 13 of the wedge 12 is reduced, and the teeth of the insertion hole 13 bite into the PC steel stranded wire 39 to pinch the PC steel stranded wire 39. When tension is applied to the PC steel stranded wire 39, the wedge 12 biting into the PC steel stranded wire 39 is drawn into the conical hole 4, and the teeth of the insertion hole 13 of the wedge 12 pinch the PC steel stranded wire 39 more strongly. Thus, the stranded PC steel wire 39 inserted into each sleeve body 2 is fastened by the wedge 12. Concrete is poured into the inside of the molds 28 to 30 on which the PC steel strand 39 is stretched, and after the concrete is completely solidified, the end of the PC steel strand 39 is released from the connecting tool 10 to obtain a product (PC girder). ) 41 to 43 are completed. PC
When the steel stranded wire 39 is detached from the connecting tool 10, when the release sleeve 16 is pushed into the inside of the sleeve main body 2, the wedge 12 comes out of the conical hole 4 against the force of the spring 15.
However, the force for holding the PC steel stranded wire 39 is released. With the release sleeve 16 pushed into the inside of the sleeve body 2,
The PC steel strand 39 can be pulled out from the sleeve body 2.

As described above, according to the present invention, the PC steel is inserted into the hole of the conical wedge divided into three parts, and then the conical wedge is fitted into the conical hole of the sleeve body, and the tension is applied to the PC steel. If force is applied, if there is no slippage in the initial stage, the conical wedge will be tightly fitted into the conical hole of the sleeve body, and will more strongly capture the outer peripheral surface of the PC steel, so that an excessive load will act on the connection tool However, there is no risk that the PC steel material will be damaged or come off. P
PC is attached to the peripheral wall of the middle part of the connecting tool that applies tension to the C steel.
With a window hole that allows the user to visually check the mounting state of the steel material, the connection state can be quickly and easily viewed even during processing operations such as applying tension to the PC steel material. It is easy to use and has no problem in strength, and can be used for connection of PC steel materials having different diameters (for example, diameters of 15.2 mm and 12.7 mm). Since the mounting state of the PC steel material can be observed, it is possible to prevent the PC steel material from slipping during tension or an incompletely fixed state, and the safety is extremely high.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a connecting member made of PC steel according to the present invention.

FIG. 2 is a front sectional view of the connection device taken along line 2A-2A in FIG. 1;

FIG. 3 is a perspective view of the connection tool.

FIG. 4 is a side cross-sectional view of a PC girder manufacturing facility in which the connector according to the present invention is used.

[Explanation of symbols]

2: Sleeve body 4: Conical hole 7: Window hole 10: Connector 12: Wedge 15: Spring 16: Release sleeve 3
1: Screw rod 39: PC steel stranded wire

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D07B 7/18 E04G 21/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A screw hole provided at a base end of a pair of sleeve bodies is screwed into a screw hole and integrally joined to form a conical hole tapering from the base end to the tip end of each sleeve body. A conical wedge having a hole through which a steel material is inserted and divided into three in the circumferential direction is fitted into the conical hole, and a spring is interposed between the base end of the wedge and the screw rod. A release sleeve that pushes back the wedge against the force of the spring is fitted to the distal end of the sleeve, and the condition of the PC steel material between the base end of the wedge and the screw rod is checked on the peripheral wall of the intermediate portion of each sleeve body. A connecting member made of PC steel, comprising a window hole.