JPH0452353Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is designed to provide a high-quality steel material to the tips of multiple reinforcing bars arranged within the formwork of the PC (precast concrete) beam when manufacturing precast concrete members such as precast concrete (PC) beams. This invention relates to a device for accurately locating the thread pitch of an attached reinforced mechanical joint.

(Conventional technology) Conventionally, for example, in a PC beam, reinforcement was arranged within the beam4.
There is a method in which threaded joints (mechanical joints) are attached to the ends of the main beam reinforcements so that each threaded joint protrudes from the beam end face of the PC beam (for example, Japanese Utility Model Application No. 59-80002). The method of connecting PC beams was to screw both ends of a threaded rod between opposing joints to connect them, and to secure the connected portions with nuts.

(Problem to be solved by the invention) However, according to the above example, if there is a shift in the thread pitch phase of the opposing threaded joints, one end of the threaded rod can be connected to one threaded joint, but the other end can be connected to one threaded joint. The PC beams could not be screwed into the other threaded joint, resulting in the inconvenience of not being able to connect the joints between the PC beams, and they were struggling to find a solution to this problem.

(Purpose of the invention) The purpose of the invention is to accurately position the screw pitch of a mechanical joint with a simple configuration and operation.

(Means for Solving the Problems) The present invention has a cylindrical adjustment bolt 2 having a threaded hole 23 at its axis attached to a plurality of threaded holes 11 provided at predetermined positions of a support plate 1 in a penetrating state. The screw pitch phase of the screw hole 23 in the axial center of this bolt can be set to an arbitrary phase difference, and the fixing nut 3 is attached to the protruding end of the adjustment bolt protruding from one side of the support plate. The adjustment bolt is fixed to the support plate with this nut, a joint support bolt 4 passes through the bolt and nut, and the protruding end of this support bolt that protrudes from the nut is screwed into a reinforcing mechanical joint 6 to support this joint. A pitch scale 12 of the bolt screw surrounding the adjustment bolt head 21 is attached to the outer surface of the support plate, and a mark 22 is attached to the top of the adjustment bolt head closest to the position where the threading of the inner thread of the adjustment bolt starts. It has been established that

(Function) Attach to support plate 1 and tighten all adjustment bolts 2.
The bolts are fixed to the support plate by aligning the phases of the screw pitches in the screw holes at the center of the shaft at a constant level, and attaching the fixing nut 3 to the tip of the bolt on one side of the support plate.

(Example) An example of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, a rectangular steel support plate 1 has four screw holes 11 passed through it corresponding to the corners. A hexagonal bolt-shaped adjustment bolt 2, . . . is screwed into each screw hole 11 so as to pass through the screw hole 11. A threaded hole 23 is formed through the axial center of each adjustment bolt, and the thread pitch of this threaded hole is different from the thread pitch on the outer periphery of the bolt. In addition, screw hole 23
The inner thread of the bolt and the outer thread of the outer periphery of the bolt may have a reverse thread relationship. In order to align the thread pitch phases of the inner threads of the threaded holes 23 of each adjustment bolt 2, a bolt thread pitch scale 12 surrounding the bolt head 21 is attached to the outer surface of the support plate 1, and the scale is "0". "1/4" counterclockwise in Figure 2 based on
The "1/2" scale is centered on the axis of the adjustment bolt.
Each is attached at a 90° angle. Standard scales 12a, 12b corresponding to each adjustment bolt 2,
12c and 12d, the thread cutting start position of the inner thread of the screw hole 23 of each adjustment bolt is set in a certain direction, and then the position is determined. In other words, from the starting position of thread cutting of the inner thread, for example, the second
A mark 22 is engraved on the top of the bolt head 21 closest to this position in the counterclockwise direction in the figure, and reference scales 12a to 1 are engraved on the outer surface of the support plate 1 at a position corresponding to this mark.
2d are attached to each. When the mark 22 is moved, for example, from "0" to "1/4" on the scale 12, the adjustment bolt 2 has been rotated by 1/4 pitch from its initial position. Therefore, if the thread pitch of the threaded hole 11 is twice the inner thread pitch of the threaded hole 23, the inner thread pitch can be moved by 1/2 turn by 1/4 turn of the bolt 2.

The inner surface of the support plate 1 in the adjustment bolt 2 (the first
A fixing nut 3 in the form of a cap nut is attached to the protruding end protruding to the right side in the figure, and the adjustment bolt is fixed to the support plate by this fixing nut. Joint support bolts 4, . The joint is supported by being screwed into the screw hole 61 of the joint. The rear end of this joint is fitted and crimped onto the tip of the reinforcing bar 5.

Next, the positioning work will be explained.

The mold frame 7 is assembled in advance, and the threaded joints 6 of the reinforcing bars 5 are inserted and supported through the mounting holes 71, . . . provided in the mold frame. First, place a third screw into each screw hole 11 of the support plate 1.
As shown in the figure, the adjustment bolts 2 are screwed in, and when the tips of the adjustment bolts protrude a certain length from the inner surface (right side) of the support plate, the inner thread pitches of each adjustment bolt are aligned. To do this, turn each adjustment bolt 2 to align the threading start positions of the inner threads, but first, align it with the mark 22 corresponding to the threading start position of the inner thread of one of the four adjustment bolts. Then, a scale 12a is attached to the support plate 1. As a result, the starting position for thread cutting of the inner thread of one adjustment bolt 2 is specified. Next, as shown in FIG. 4, a fixing nut 3 is attached to the protruding end of the adjusting bolt 2 to fix it in the bolt position. At this time, the adjustment bolt 2 is rotated by a predetermined angle, and the mark 2
If the mark 2 deviates from the scale 12a, the adjustment bolt is reversed so that the mark 22 coincides with the scale 12a.

Similar operations are performed for the remaining adjustment bolts 2, but the threading start positions of the inner threads of these adjustment bolts are made to match the threading start positions of the adjustment bolts whose positions were identified first.

Thereafter, as shown in FIG. 5, the joint support bolt 4 is screwed into the screw hole 23 of the adjustment bolt 2, passed through the nut 3, and the tip is inserted into the screw hole 23 of the joint 6.
1 to support the joint. An adjustment bolt 2 is fixed to the support plate 1 with a fixing nut 3,
Since the thread pitches of the inner threads of each bolt are all determined to be in the same phase, the thread pitches of the threaded holes 61 of all the joints 6 match when the joint 6 is supported and fixed by the joint support bolt 4. After connecting the joint 6, pour concrete 8 into the mold frame 7.
Manufacture PC parts. When removing the positioning device from the joint 6, if the joint support bolt 4 is moved to the outside and this joint support bolt is made to protrude from the bolt head 21, the work of setting the joint for the next PC beam can be repeated. .

In this way, for example, a PC beam is manufactured in which four joints 6, all of which have screw holes 61 with the same thread pitch, protrude from the end face.

When mass-producing this type of PC beam and connecting the PC beams using threaded rods, the threaded pitch of the screw hole of the joint protruding from one end of the PC beam and the threaded pitch of the joint's screw hole protruding from the other end. It is necessary to match the thread pitch of the joint's screw hole. Therefore, the thread cutting start position of the inner thread of each adjustment bolt 2 may be fixed at, for example, the hour position, that is, the position of the scale 12a in FIG. 2. By doing this, the screw pitches of the screw holes of the joints on both end faces of the PC beams will match, so the PC beams will be positioned facing each other and the joints will be joined by the threaded rod.

(Effects of the invention) As explained above, according to the invention, the thread pitch of the joint can be accurately positioned with a simple configuration.
Furthermore, positioning work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the state of use, FIG. 2 is a side view showing the state of use, and FIGS. 3 to 5 are sectional views showing the positioning operation step by step. 1...Support plate, 11...Screw hole, 12...Pitch scale, 2...Adjustment bolt, 21...Adjustment bolt head, 22...Marker, 23...Screw hole, 3...Fixing nut, 4 ...Joint support bolt, 5...Reinforcement bar,
6...Mechanical joint.

Claims (1)

[Scope of Claim for Utility Model Registration] A support plate having a plurality of threaded holes passing through it at predetermined positions; A cylindrical adjustment bolt that is attached to the threaded holes so as to pass through the threaded hole and has a threaded hole in its shaft center; and this adjustment. A fixing nut that is attached to the protruding end of the bolt protruding from one side of the support plate to fix the adjustment bolt to the support plate, and a tip that passes through the screw hole of the fixation nut and the adjustment bolt and protrudes toward the fixation nut. a joint support bolt that supports the joint when screwed into a mechanical joint made of reinforcing steel on the side thereof; and a pitch scale of the bolt screw surrounding the head of the adjustment bolt is provided on the outer surface of the support plate; A mark is provided on the top of the adjustment bolt head closest to the starting position of thread cutting of the inner thread of the adjustment bolt, and the thread pitch phase in the threaded hole in the shaft center of each of the adjustment bolts can be arbitrarily set to a phase difference. A screw pitch positioning device for reinforcing steel mechanical joints.