JPH088091Y2 - PC sleeper formwork side plate - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post tension type prestressed concrete sleeper formwork side plate.

[0002]

2. Description of the Related Art A post-tension type prestressed concrete sleeper (hereinafter referred to as a PC sleeper) is made by placing concrete in a formwork in which a plurality of unbonded PC steel materials are arranged in a longitudinal direction of the sleeper, and after curing and hardening the concrete. , P
Manufactured by introducing prestress into C steel. FIG. 9 shows a schematic vertical sectional view of such a conventional mold, and FIG. 10 shows a plan view thereof. Further, FIG. 11, FIG. 12 and FIG. 13 show a work procedure at the time of demolding a conventional mold side plate.

The PC sleeper formwork 1 comprises a main body formwork 3 fixed to a frame 2 and side plates 4 and 5. The conventional procedure for assembling this formwork is as follows. After attaching internal equipment and the like required for sleepers to the main body form 3, main body form 3
The side plates 4 and 5 are attached to both end faces of, and then the PC steel material 8 inserted into the fixed side pressure plate 6 and the tension side pressure plate 7 is loaded into the mold. At the fixed end surface, the side plate 4 has a truncated cone-shaped dowel 9
And insert the bolt 10 through the center hole of the dowel 9,
The bolt is screwed into a female screw provided on the fixed-side bearing plate 6 to attach the bearing plate 6 to the side plate 4.

On the other hand, on the end surface on the tension side, a female screw is formed at the head and a truncated cone-shaped dowel 11 having a square head at the rear end is attached to the side plate 5.
And then screwed into the male screw of the PC steel material 8. The dowel 11 has a flange 12 that comes into contact with the outer surface of the side plate 5. When the dowel 11 is twisted by applying a wrench to the large angled head at the rear end, the PC steel material 8 is temporarily fixed between the side plates 4 and 5. Next, concrete is poured into the mold, and after curing and hardening the concrete, the dowels 9 and 11 are twisted and pulled out, and then the side plates 4 and 5 are removed. A tension nut is screwed into the PC steel material 8 in the recessed portion of the dowel 11 and tightened with an impact wrench, and the PC steel material is tensioned with a four-head tensioner.
Prestress concrete. After that, the holes of the dowels 9 and 11 that have been removed are filled with adhesive-containing mortar to obtain a product.

11 to 13 show, as an example, the side plate 5 on the tension side.
Fig. 11 shows the removal procedure of the concrete 13
It is in the state before the mold is removed. From this state dowel 11
The head is twisted to unscrew the PC steel material 8 and the dowel is removed to the outside. FIG. 12 shows a state in which the dowel is removed, and the concave portion 14 is formed in the concrete. Then FIG.
Then, the side plate 5 is laid down, and then a tension nut is applied to the PC steel material 8 and tightened with an impact wrench, and further prestress is introduced into the concrete by a four-head tensioner.
The side plate 5 is provided with a hole 19 through which the dowel is passed, and is attached to an arm 15 that rotates around a pin 16 provided on the frame 2.

[0006]

[Problems to be Solved by the Invention] With the conventional structure of the PC sleepers as described above, it is very difficult to remove a large number of dowels one by one, and a lot of manpower is required. It was a cause of a decrease in work efficiency of sleeper manufacturing. In particular, the dowel on the end surface on the tension side is in close contact with concrete and screwed into the PC steel material, so that it is not easy to extract. Since the dowel is generally removed while rotating it with an impact wrench, there is a risk of causing white wax disease of workers during long working hours.

An object of the present invention is to provide a rational PC sleeper formwork side plate in which such drawbacks are eliminated.

[0008]

The present invention comprises the following technical means. A frustoconical dowel is fixed to the side plate of the PC sleeper formwork. A means for temporarily fixing the PC steel material to the mold side plate is provided in the dowel. The temporary fixing means is constructed so that it can be removed from the outside of the side plate after the curing and hardening of the concrete. The side plate is attached to the form frame so that it can fall over while retracting from the main formwork. It is preferable that the side plate is provided with a demolding screw device and a jack mounting device.

[0009]

[Function] Since the dowels are fixed to the side plate of the PC sleeper frame, the work of removing the dowels one by one can be omitted, and the work is rationalized, labor is saved, and work time is shortened. Can be achieved. In the conventional demolding work process, this dowel removal work is the most difficult and requires labor and time, so its effect is enormous.

A detachable means for temporarily fixing the PC steel material in the dowel, for example, a screw fixing mechanism using bolts, nuts and the like that can be detached from the outside of the side plate is provided. Since this temporary fixing means can be attached and removed independently of concrete, it is easy to remove.
Since the dowel is fixed to the side plate, the side plate cannot be removed from the mold simply by falling. Therefore, it is possible to move forward and backward. For example, the holes of the mounting pins are elongated holes. Moreover, since the side plate and the dowel are removed from the mold together, it is advisable to install a lever device or the like for moving the side plate and the dowel forward and backward. Furthermore, since a maximum force is required to separate the side plate from the concrete, in order to assist this, a jack mounting device and a set screw device for releasing the mold are provided,
It is preferable to provide a means for slightly lifting the side plate from the concrete to separate the adhesive force.

[0011]

1 to 8 show an embodiment of the present invention. FIG.
Is a side plate on the tension side, FIG. 2 is a side plate on the fixed side, FIG. 3 is a front view on the tension side of the mold side plate, FIG. 4 is a front view on the fixed side, FIG. 5 is a set screw device, and FIG. 6 is a lever device for demolding. 7 and 8 show the demolding operation. As shown in FIG. 1, a side plate 5 of the formwork of the PC sleeper of the present invention has a dowel 11 fixed thereto. A nut is screwed into the end thread portion of the PC steel material 8 in the dowel 11 to temporarily fix it. did. An arm 15 is attached to the side plate 5, and the arm 15 has a long hole 1 in which a pin 16 is provided in the form frame 2.
It is attached by inserting it in 7. The long hole 17 is the side plate 15
Has a long hole in the direction that allows it to move forward and backward in the direction away from the formwork. This is because the dowels 11 are fixed to the side plates 5, and therefore the side plates 5 cannot be separated from the concrete by simply inverting them. That is, as shown in FIG. 1, the side plate 5 first moves in parallel to the right side in the figure at the time of demolding (from position 5 to position 5a) and then falls.
(From position 5a through 5b to 5c). At this time, the arm 15 sequentially changes its position like 15a, 15b, and 15c.
FIG. 3 shows the front of the side plate 5, and three sleeper forms are arranged side by side.
The side plate is attached to the frame 2 with the two arms 15 and the two pins 16 via the bracket 18. As described above, it is optional to connect a large number of side plates and to demold them by one operation.

FIG. 2 shows the side plate 4 on the fixed side of the PC steel material 8. The PC steel material 8 is attached to the pressure support plate 6, and the pressure support plate 6 is fixed to the side plate 4 by bolts passing through the dowels 9 fixed to the side plate 4. This bolt can be attached and removed from the outside of the side plate 4, and the PC steel material 8 is fixed to the side plate 4 before placing concrete. The side plate 4 is attached to the elongated hole 17 by the pin 16 via the arm 15 and moves parallel and falls like 4d, 4e, and 4f as described in FIG.

FIG. 4 is a front view of the fixed side plate 4, and the mounting of the fixed side plate 4 on the frame 2 and the connection of a plurality of the same are the same as those on the tension side described with reference to FIG. On this fixed side, two dowels 9 are shown for each sleeper. FIG. 5 shows an example of a demolding push screw device used when the side plates 4 and 5 of the present invention are separated from concrete and demolded. A nut 21 is fixed to the side plates 4 and 5, and a push bolt 22 is screwed to the nut 21. By twisting the push bolt 22, the head 23 of the push bolt 22 takes a reaction force against the concrete and separates the side plates 4 and 5 from the concrete. Since the side plate of the present invention has the dowels fixed thereto, it is not easy to remove it from the concrete, but it is advisable to provide such a set screw device at the position of the set screw 22 shown in FIGS. 3 and 4, for example.

FIG. 6 shows an example of a lever device 30 for moving the side plate 5 in parallel and then inverting it. Lever 31
The side plate 5 can be moved in the movement mode shown in FIG. 1 by pulling the lever to the lever device in the directions of the insertion arrows 31 and 32. The procedure for removing the side plate of the present invention will be described with reference to FIGS. FIG. 7 shows a state where the concrete 13 is cured and hardened. Remove the temporary fixing nut in the dowel 11 from the outside from the PC steel material 8 with a socket wrench. Then, the push bolt shown in FIG. 5 is twisted to move the side plate 5 together with the dowel 11 into the concrete 13
Pull it slightly away from. Using the lever device of FIG. 6, the side plate 5 is pulled to the position a shown by the broken line in FIG. Since the arm 15 is pin-connected to the long hole 17, these operations are simple. A nut for main tension is inserted in the removal mark 14 of the dowel and screwed to the PC steel material 8 to introduce prestress to the sleeper. Next, the sleeper is taken out of the form and removed to fill the trace 14 with mortar. After the mold 1 has been cared for and the internal device has been installed, the side plates are inverted and moved in parallel in the reverse order of the above, to be mounted on the mold and the PC steel material is temporarily fixed. In this way, the formwork is reused.

[0015]

EFFECT OF THE INVENTION The formwork side plates of the PC sleepers of the present invention are provided with a pair of dowels, and the PC steel material is temporarily fixed by means of bolts and nuts which can be detached from the outside by means different from the dowels. Since it can be fallen freely, the effort of demolding the conventional PC sleepers and the prestressing process is drastically reduced.

[Brief description of drawings]

FIG. 1 is a side view of a side plate on a tension side of a PC sleeper formwork of an embodiment.

FIG. 2 is a side view of a side plate on the PC sleeper fixed side of the embodiment.

FIG. 3 is a front view of a side plate on a tension side.

FIG. 4 is a front view of a side plate on a fixed side.

FIG. 5 is an explanatory diagram of a push screw device.

FIG. 6 is an explanatory diagram of a lever device for demolding.

FIG. 7 is an explanatory diagram of a demolding operation.

FIG. 8 is an explanatory diagram of a demolding operation.

FIG. 9 is a vertical sectional view of a PC sleeper formwork.

FIG. 10 is a plan view of a PC sleeper formwork.

FIG. 11 is an explanatory view of a side plate of a conventional PC sleeper formwork.

FIG. 12 is an explanatory view of a side plate of a conventional PC sleeper formwork.

FIG. 13 is an explanatory view of a side plate of a conventional PC sleeper formwork.

[Explanation of symbols]

 1 Formwork 2 Frame 3 Body Formwork 4, 5 Side Plate 6 Fixed Side Pressure Support Plate 7 Tension Side Pressure Support Plate 8 PC Steel Material 9 Dowel 10 Bolt 11 Dowel 12 Flange 13 Concrete 14 Recess 15 Arm 16 Pin 17 Long Hole 18 Bracket 19 Dowel Side plate hole

Claims (2)

[Scope of utility model registration request] 1. A frusto-conical dowel is fixed to a side plate of a PC sleeper frame, and means for temporarily fixing the PC steel material to the side plate of the frame from the outside of the side plate is provided in the dowel. A formwork side plate of a PC sleeper characterized in that the formwork side plate is attached to the formwork frame so as to be able to move forward and backward and to fall. 2. The mold side plate of the PC sleeper according to claim 1, further comprising a demolding screw device.