JPS5929110A - Method of installing stretching material in prestressed concrete member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing tension feathers such as PC@ phase to be buried in prestressed concrete members such as PC sleepers when producing prestressed concrete members such as PC sleepers.

Prestressed conch! J-) When manufacturing members using the fretting method or the post tension method, the tendons must be accurately installed at predetermined positions in the prestressed concrete system. In addition, if the ends of the tendons are exposed above the concrete surface, they will rust, so it is preferable to bury them in the concrete so that the required thickness can be covered.

Therefore, a method of installing tendons as shown in Figure 1 has been considered in the past, but in the case of this type of installation method, there is a gap between the anchoring fittings and the concrete surface, and a cover from the dowel hole to the concrete surface. There was a risk of cracking as there was very little.

The present invention has been devised to solve these conventional drawbacks, and includes a structure in which a stopper is removed by protruding inward from one end of the formwork, and a fixing metal is fixed to the tip of the stopper. A plurality of tension members each having a pull-out stopper head at the base end are passed through the fixing metal fitting through its back side, and the tip thereof is fixed to the other end of the formwork, and The present invention provides a method for installing a tensioning chestnut in the upper phase of breast-stressed concrete, in which a locking member for locking the end portion is disposed within the formwork, and the plurality of tension members can be tensioned simultaneously.

The present invention will be described below with reference to an illustrated embodiment. Reference numeral 2 in the figure is a formwork for manufacturing PC sleepers. A stopper Pe3 is attached to one end in the longitudinal direction of the formwork 2 (protruding inward from the formwork 2), and a male thread 4 is formed in the protruding portion of the stopper 3, and a fixing fitting is attached to the male screw 4. 5 is formwork 20
It extends in the width direction and is screwed on.

A through hole 6.6 is formed in the fixing fitting 5.
One end of the tension material 7.7 of the PCC moon phase installed in the formwork 2 is penetrated at 6, and a pull-out stop head 15.15 is formed at the part where the tension material 7.7 passes through.

゛The other end of this tension material 7.7 is attached to the opposite end of the formwork 2 in the longitudinal direction. A fixing putty 14.14 is screwed onto the external thread 13.13 of the holder.

A locking member 8 is disposed within the formwork 2 so as to lock the end of the fixing metal fitting 5 on one side.

FIG. 4 shows an example of the 1F0 department month 8. As shown in the figure, the locking part side 8 has a groove 9 in which the end of the fixing metal fitting 5.5 is fitted into the base 10 and locked therein. S) is formed. FIG. 3 shows a schematic diagram of the state in which the ends of the fixing fittings 5.5 are fitted and locked into the grooves 9, 9 of the handles.

As mentioned above, when installing the tension members 7, 7 in such a 41'q configuration, the tension members 7, 7 are passed through the l'J through holes 6, 6 of the anchor fittings 5 through the fixing metal fittings J1, 5 from the back side. Let me say a few words. At one end of the frozen formwork 2 in the longitudinal direction, attach a stopper 3 to its tip. Protrude the screw 4 inward of the formwork 2 and remove it.

Then, the tension member 7.1 is attached to the male screw 4 portion of the stopper 3, and the fixing member 5 is screwed onto the tension member 7.1.
The fixing fitting 11.11 and the receiver attached to the opposite end of the formwork 2 in the longitudinal direction are continuously passed through the fitting 12.12, and fixed to the male thread 13.13 of the penetrating portion (1).
4. Screw on 14.

The tension levers 7, 7 are located in the 1st part of @11 which is not locked by the locking part 8 in the fixing metal fitting 5 which has a negative passage.
To make nervous month 7 nervous. As a result, the fixing fitting 5 is slightly inclined with the male thread 4 of the fastening fitting 3 as a fulcrum. At the same time, the tension member 7 on the side whose end is not locked by the locking member 8 is also tightened.

Thus, according to the present invention, the above-mentioned favorable γ growth is achieved. lII! It is possible to accurately and reliably and extremely easily install the pre-strength, which is installed inside the upper side of the formwork, in the predetermined position of the formwork, and the parts used therefor. You can save money.

In addition, the locking member 8 and the fitting 3 are removed after the assembly is manufactured, and the recess K) formed by removing the locking part is filled with mortar, etc., so parts can be saved and the tension material It is possible to prevent rust from forming.

Further, according to the present invention, there is an advantage that there is a high risk of cracking in L7) where the cover from the fixing fitting to the concrete surface and the cover from the dowel hole to the concrete surface can be made to a predetermined thickness.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional example, Fig. 2 is a cross-sectional view of an embodiment by Mizumoto Jl, Fig. 3 is a schematic view showing a state in which the locking part and the fixing metal fitting are locked, and Fig. 4 is a cross-sectional view showing a conventional example. Figure (-, V section n: Sound IS
FIG. 3 is a perspective view of the phases. 2. Formwork, 3. Fasteners, 4. Maintenance, 5.
Fixing metal fitting, 6...Through hole, 7...Tensioning part, 8...Latching part lever, 9...Concave groove, 10...Base, 11...Fixing metal fitting, 1
2. The receiver is gold J13.13...) 4F screw, 14. Fixing nut, 15. Removal stop head. 1 Figure 2 314 Commissioner of the Patent Office 1. Indication of the case: Patent Application No. 138905 of 1982 2. Title of the invention 3. Relationship with the case by the person making the amendment Patent applicant address name Japan Kogen Concrete Co., Ltd. 5, Supplement 7 [Daily instruction Voluntary correction Showa year month [=1 (Shipping [-1) Fig. 3 Fig. 2]

Claims (1)

[Claims] A +1 metal fitting is added to one end of the formwork by protruding inward from the formwork, and a fixing metal fitting is fixed to the tip thereof, and a plurality of tension members having a pull-out prevention head at the base end are attached to the fixing metal fitting. A locking member is disposed in the formwork, the locking member passing through the fixing member from the back side, fixing its tip to the other end of the formwork, and locking one end of the fixing metal fitting. A method for installing tendons in a prestressed concrete member, characterized in that the tendons are simultaneously tensioned and scaled.