JPH0547605Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is applicable to concrete sleepers, concrete piles,
This invention relates to a manufacturing device for prestressed concrete members such as concrete plates.

(Prior art) Conventionally, in manufacturing equipment for introducing prestress into precast concrete members using the post-tensioning method, as shown in Fig. 6, first and second A formwork 3 supporting formwork panels 1 and 2 is provided, and a fixing plate 4 is disposed in parallel to the first formwork panel 1 within the formwork 3. A fixing plate 5 is arranged parallel to the formwork panel 2 of No. 2, and a plurality of tension steel members 6 are arranged in the formwork 3 along the direction of introducing prestress, and each of these tension steel members 6 is connected to an anchor. Each head 6A of the plate 4 and the fixing plate 5 is brought into contact with and locked to the anchor plate 4, and the anchor plate 4 is fixed to the first formwork panel 1 with the support bolts 7 and nuts 8.
The first formwork panel 1 supports tapered first concave molded bodies 9 at positions corresponding to the heads 6A of each tension steel 6. Cover each anchor plate 4
A second tapered concave molded body 10 is supported through the second formwork panel 2 at a position corresponding to the tip 6B of each tension steel member 6, and is abutted against the fixing plate 5. The structure was such that a tightening and holding rod 11 was screwed onto the tip 6B of each tension steel member 6 within the tapered concave molded body 10.

In such a manufacturing device, concrete 12 is poured into a formwork 3 to form a prestressed concrete member 13 such as a concrete sleeper,
After the concrete 12 hardens, the first and second formwork panels 1 and 2 are removed together with the first and first tapered concave formed bodies 9 and 10, respectively, and each tension steel member 6 is tensioned and a nut is inserted into its tip 6B. After screwing and fastening, the recesses of the concrete 12 formed at the sites of the first and second tapered recess molded bodies 9 and 10 are filled with mortar to produce a prestressed concrete member 13 such as a concrete sleeper. Ta.

(Problem to be solved by the invention) However, in such a manufacturing device, since a recess is formed corresponding to the head 6A of each tension steel member 6, there are many places to fill with mortar, which increases the cost. There was a problem with getting high.

An object of the present invention is to provide an apparatus for manufacturing prestressed concrete members that can reduce the number of places filled with buried mortar.

(Means for Solving the Problems) In order to solve the above object, the prestressed concrete member manufacturing apparatus of the present invention includes a formwork that supports first and second formwork panels at both ends in the prestress introduction direction. A fixing plate is disposed in the formwork parallel to the first formwork panel, a fixing plate is disposed parallel to the second formwork panel, and the fixing plate is disposed parallel to the first formwork panel, and A first tapered concave molded body having a tapered shape is penetrated and supported by the form panel at a position corresponding to the anchor plate with its tip abutting the anchor plate, and the anchor plate is connected to the first tapered concave molded body. The first support bolt is threaded through the body and screwed onto the anchor plate.
A plurality of tension steel members are arranged in the formwork in a direction along the prestress introduction direction, and each of the tension steel members is fixed to a contact position of the first tapered concave molded body. The tension steel members pass through both the anchor plate and the fixing plate at positions different from the fixing plate, and each head thereof abuts and locks on the anchor plate, and the tips of the tension steel members that pass through the fixing plate correspond to these. and are inserted into the second tapered concave molded bodies each penetrating the second formwork panel and locked therein.

(Function) In this way, the first tapered concave molded body is provided at a different position without corresponding to each tension steel material,
By embedding the head of each tendon member in the concrete from the beginning, the number of first tapered recess moldings can be reduced, and therefore the number of places to be filled with embedding mortar can be reduced.

(Example) Next, an example of the present invention will be described with reference to FIGS. 1 and 2. Note that parts corresponding to those in FIG. 6 showing the prior art described above are designated by the same reference numerals. In this embodiment, the first tapered concave molded body 9 is provided at one location corresponding to the center of the anchor plate 4 without corresponding to the head 6A of each tension steel member 6. This first tapered concave molded body 9 is passed through the first formwork panel 1 and is locked to the first formwork panel 1 at its flange 9A, and its tip abuts against the anchor plate 4. ing. A support bolt 7 is passed through the first tapered concave molded body 9, and the tip of the support bolt 7 is screwed onto the anchor plate 4.
supported by formwork panels. Accordingly, the head 6A of each tension steel member 6 is completely housed within the formwork 3. Although not shown, an unbonding agent is applied to each head 6A of these tensioned steel members 6. Although not shown, an unbonding agent is also applied to the surface of each tension steel material 6. Tip 6 of each tension steel member 6
B is screwed into the second tapered concave molded body 10.

Such an apparatus also produces a prestressed concrete member 13 by pouring concrete 12 into the formwork 3 as described above. In the obtained prestressed concrete member 13, only one tapered recess is formed at the site of the first tapered recess formed body 9 on the anchor plate 4 side.
Therefore, the number of places to be filled with mortar is reduced.

In this embodiment, a pair of upper and lower tension steel members 6,
6 is supported by one anchor plate 4 and one fixing plate 5, but in order to prevent these from rotating when installed in the formwork 3, the structure shown in FIGS. 3 and 4 is As shown in FIG. 2, a rotating pawl jig 18 having a recess 17 into which the anchor plate 4 is fitted is fitted into the formwork 3 and tensioned.

In addition, each head 6A of tension steel material may be
As shown in FIG. 5, each cap 14 may be covered with a cap 14 and each cap 14 may be bonded to the anchor plate 4 with an adhesive 15. In this case, an unbonding agent may be applied inside each cap. By doing so, when applying tensile force to the tension steel material, the head does not directly adhere to the concrete, improving tensile workability.

(Effect of the invention) As explained above, in the prestressed concrete member manufacturing apparatus according to the present invention, the first tapered recess formed body is provided without corresponding to the tension steel material. The number of pieces used can be reduced, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of an embodiment of the device according to the present invention, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a vertical front view showing a rotation stopper, and FIG. 4 is a vertical side view of the same.
FIG. 5 is a side view of another embodiment of the tensioned steel head, FIG. 6 is a longitudinal sectional side view of the conventional device, and FIG. 7 is a sectional plan view thereof. 1, 2...First and second formwork panels, 3...Formwork, 4...Anchor plate, 5...Fixing plate, 6
...Tension steel material, 6A...Head, 6B...Tip, 7
...Support bolt, 9, 10...First and second tapered concave molded bodies, 12...Concrete, 13...
...Prestressed concrete member, 14...cap.

Claims (1)

[Scope of utility model registration request] A formwork supporting first and second formwork panels is provided at both ends in the prestress introduction direction, and a fixing plate is disposed within the formwork parallel to the first formwork panel. A fixing plate is disposed parallel to the second formwork panel, and the first formwork panel has a tapered first plate with its tip abutting the anchor plate at a position corresponding to the anchor plate. A tapered concave molded body is supported through the first tapered concave molded body, and the anchor plate is fixed to the first formwork panel by a support bolt that passes through the first tapered concave molded body and is screwed to the anchor plate. A plurality of tension steel members are arranged in the formwork in a direction along the prestress introduction direction, and each of the tension steel members is connected to the anchor plate and the tension steel member at a position different from the contact position of the first tapered concave molded body. The respective heads of the tensioned steel members passing through the fixing plate are brought into contact with the anchor plate, and the ends of the tension steel members passing through the fixing plate are attached to the second formwork panel in a corresponding manner. An apparatus for manufacturing a prestressed concrete member, characterized in that the prestressed concrete member is inserted into a tapered second tapered recessed molded body which is respectively penetrated and locked.