JPH0513221B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method for accurately positioning a threaded joint attached to the tip of the main reinforcing bars arranged in a PC member when manufacturing a PC member. It is related to the device.

(Prior Art) Reinforcement joint fittings have been proposed as a means of connecting the main beam reinforcements of, for example, PC beams (Utility Model Application Publication No. 57-80527). As shown in Fig. 4, this joint fitting is used, for example, for the beam main reinforcements R and Ra of the PC beams P and Pa.
It is used to connect the four main beam reinforcements R, each protruding from the opposing surface of this PC beam.
Connecting threaded rod body S that connects threaded joints J and Ja attached to the tip of Ra and both threaded joints located opposite each other
The connection between the threaded joint and the threaded rod body is fixed using nuts N and Na. The method of connecting threaded joints J and Ja using threaded rod body S is to connect threaded joint Ja of one fixed PC beam Sa that has completed erection to threaded joint J of the other PC beam S that has been erected.
Place the threaded rod bodies S, which are pre-attached to the
It is fed into the Ja and connects the threaded joints, thus sequentially connecting the four main beam reinforcements.

(Problem to be solved by the invention) However, since the threaded joint Ja is fixed,
If the thread pitches of any one of the four sets of opposing threaded joints J and Ja are misaligned, there will be an inconvenience that the four beam main reinforcements cannot be connected. For this reason, the above-mentioned problems can be eliminated by positioning each threaded joint so that pitch deviations will not occur during the manufacturing stage of the PC member.

An object of the present invention is to accurately position a threaded joint with a simple configuration and operation.

(Means for Solving the Problems) The present invention is characterized in that four fully threaded positioning screw rods parallel to each other pass through a support base, and couplers are screwed to both ends of the positioning rods. The protrusion lengths on both sides of the above-mentioned positioning screw rods from the support base are approximately equal on each side, and the thread cutting start position of the tip of the protrusion end from one side of the support base is the same. The coupler is provided with a screw therein for threaded connection with the connecting threaded rod body connected to the threaded joint of the PC member.

(Example) An example of the present invention will be described below based on FIGS. 1 to 3.

The plate-shaped support base 1 has four fully screwed screws arranged horizontally.
The book positioning screw rod body 2 is fixed in a penetrating state. Couplers 3 and 13 having internal threads are screwed to both ends of each positioning screw rod 2, respectively. A connecting threaded rod body 6 for connecting the threaded rod body 2 and threaded joints 5, 15 fixed to the tips of the main reinforcing bars 4, 14 can be screwed to the couplers 3, 13. The length of the couplers 3, 13 is such that they can come into contact with the end surfaces of the threaded joints 5, 15 when connected to the threaded rod body 6.

The protruding lengths of all the positioning screw rods 2 from the support base 1 are approximately equal on both sides.
That is, the threaded rod body 2 to which the coupler 3 is attached
The four protruding lengths on the right side of the figure are equal, and the four protruding lengths on the left side are also equal. The thread cutting start positions of the protruding tips of all the threaded rod bodies 2 from the right side of the support base 1 are made to coincide with each other.

Next, the positioning work of the threaded joints 5 and 15 will be explained.

The rear end of the connecting threaded rod body 6 is screwed into the threaded holes 5a, 15a of the threaded joints 5, 15 in advance, leaving a gap at the rear end of the hole, and first the main reinforcements 4, 14 and the threaded joints 5, 15 are molded Frame side plate M, M support hole Ma,
Ma, and connect the tip of the threaded rod body 6 to the threaded joint 3,
13, feed the couplers 3, 13 into the connecting threaded rod body 6, or feed the connecting threaded rod body into the coupler, and screw the connecting threaded rod body into the screw holes 3a, 13a (Fig. 1) of the coupler. Stop feeding when it comes into contact with the positioning screw rod 2,
Finish positioning the threaded joint. At this time, the couplers 3 and 13 are in contact with the end surfaces of the threaded joints 5 and 15, respectively. The positioning of other threaded joints is done in the same way.

After that, concrete is poured into the formwork M to form the PC beam, and after the concrete hardens,
The connections between the couplers 3 and 5, 13 and 15 by the threaded rod body 6 are released.

Therefore, as shown in Fig. 4, the PC beam P and PC
When connecting beam Pa, adjust the spacing between both PC beams, and then connect a pair of beam main reinforcements R and Ra facing each other on the left and right.
If they are connected, the remaining three sets of beam main reinforcements can also be connected.

In the above example, the positioning screw rod body 2 and the main reinforcements 4, 14
couplers 3 and 1 in a state where they are coupled.
3 comes into contact with the threaded joints 5 and 15 and covers the connecting threaded rod body 6 together with the threaded joints to protect the connecting threaded rod body, so there is no risk of concrete adhering to the threaded rod body or contact with reinforcing bars. Damage can be prevented.

(Effects of the Invention) As described above, according to the present invention, the threaded joint can be reliably positioned with a simple configuration and operation.

[Brief explanation of the drawing]

Figure 1 is a partially sectional front view, Figure 2 is Figure 1-
A line sectional view, FIG. 3 is a partially sectional front view showing a state of use, and FIG. 4 is a partially sectional front view showing a state in which PC beams are connected by a joint fitting. 1...Support stand, 2...Positioning screw rod body, 3,
13... Coupler, 4, 14... Main reinforcement, 5, 15
...Threaded joint, 6...Connecting threaded rod body.

Claims (1)

[Scope of Claims] 1. Four fully threaded positioning screw rods parallel to each other pass through the support base, and couplers are screwed to both ends of the positioning rods, and all the positioning screws are connected to each other by screws. The protrusion lengths on both sides of the rod from the support base are approximately equal on each side, and the thread cutting start position of the protruding end tip from one side of the support base is aligned, and the above coupler has the following characteristics: 1. A positioning device for a threaded joint of a PC member, characterized in that a screw is provided inside for threaded connection with a connecting threaded rod body connected to a threaded joint of a PC member. 2. In claim 1, the length of the coupler is such that it can come into contact with the end face of the threaded joint when connected to the connecting threaded rod body. Device.