JPH0596525A - Producing apparatus for concrete pile and coupling with screw - Google Patents

Abstract

PURPOSE:To reduce the number of forms, to enhance economical efficiency, to enhance the rotary efficiency of the form and to efficiently produce a concrete pile by arranging a tensile rod device to the internal end part of the form and applying tensile force to the reinforcing rod cage in the form engaged with the adjacent tensile plate by pulling said tensile rod device. CONSTITUTION:In an apparatus for producing a concrete pile, a tensile rod device is constituted by connecting a tensile plate 20 to one end part of a coupling 1 and connecting a tensile rod 10b to the other end part thereof by a screw in a rod state capable of transmitting the left and right rotations around the axis of said rod 10b. The tensile rod device is arranged to the internal end part of a form 50 and pulled to apply tensile force to the reinforcing rod cage in the form 50 engaged with the adjacent tensile plate 20. As a result, even when concrete piles having various lengths are produced, by adjusting the length of the tensile rod device, said piles can be produced by the form 50 with a definite length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing PC concrete piles for supporting structures, PC concrete poles used for electric poles, etc., and a coupling used in this apparatus, especially for transmitting rotational force. Regarding coupling with screws that can be done.

[0002]

2. Description of the Related Art Generally, when a prestress is introduced into a main body such as a cylindrical PC concrete pile or a PC concrete pole, it is usually carried out as follows.

As shown in FIG. 15, a core rebar cage (45) is set in a lower mold (50b) of a centrifugal molding mold (50) divided into upper and lower semicircles, and a lower mold is also formed. (50
b) Fill a predetermined amount of fresh concrete into the upper formwork (5
0a) is closed and closed, and the upper and lower molds are fastened to each other at the flange (52). Both ends of the mold (50) are sealed by fixing plates (151a) (151b), and a centrifugal tire (56) for transmitting rotation at a required axial interval is provided on the outer periphery of the mold.

After this, the tension rods (110) previously set on the end portions of the rebar cage (45) and the form (50).
The tension rod (11) is pulled in the axial direction from the outside of the mold (50) to give a tension to the reinforcing cage (45).
The end (0) is locked to the mold (50), the mold (50) in the above state is set in the centrifugal molding device and rotated, and centrifugal force is applied to the mold to perform centrifugal molding.

After steam curing, the molded concrete pillars were taken out from the mold (50) to manufacture concrete piles and poles. The prestress is given by the force of the rebar cage (45) to contract when the tension is relaxed.

[0006] In the above manufacturing, when the tension is applied to the reinforcing bar cage (45) inside the mold (50), it is usually performed by the following means.

The main bar (44) of the rebar cage (45) is cut into a certain length, and each end is headed (44).
a) and is knitted like a basket with hoop muscles (46).

End metal fittings (40) of concrete pillars, such as piles, are engaged with both ends of the main bar (44) of the rebar cage (45). For example, as shown in FIG. 17, the end fitting (40) has a cap shape formed by an end plate (41) and a side plate (42).
Gourd-like fastening hole (43) with two large and small holes connected to each other
However, the same number is provided at the same position as the main bar (44). The small hole portion of the fastening hole (43) is a tapered small hole (43b), and a tapered seat is provided so that the headed end of the main bar (44) is locked.
The large hole portion is a screw hole (43a) for a bolt, and a tension bolt (130) described later is engaged with the screw hole (43a).

As shown in FIG. 16, a gourd-shaped engagement member with which the tension bolt (130) is engaged with a fixing plate (151b) provided at one end (the end on the right side in the drawing) of the form (50). Dowel holes (153) are provided at the same positions as the main bars (44) in the same number.

At the end on one end side (right side in the drawing) of the reinforcing bar cage (45), the heading end (44a) of each main bar (44) is connected to a large hole of the end plate (41), that is, a screw for a bolt. The end plate (41) is slightly rotated by inserting it through the hole (43a), and the end plate (41) or the rebar cage (45).
The heading end portion (44a) of the main bar (44) is locked to the seat of the tapered eyelet (43b) by pulling.

A tension port (130) is screwed into the bolt screw hole (43a) with a certain length left from the head of the bolt, and the head of the tension bolt (130) is fixed to the fixing plate (151b). ) Through the large hole (153a) of the gourd-shaped engaging hole (153) and slightly rotated to pull the rebar cage (45) so that the head of the tension bolt (130) is attached to the gourd-shaped engaging hole. Of the small holes (153b), that is, the fixing plate (151b).

At the other end (the end on the left side in the drawing) of the main bar (44) of the reinforcing bar cage (45), the mold (50) is slightly spaced apart from the end fitting (40). Frame (50)
A tension plate (120) having a diameter substantially the same as the inner diameter is arranged. The tension plate (120) is provided with the same number of gourd-shaped engagement holes (123) as the engagement holes (153) of the fixed plate (151b) at the same position as the main bar (44) and its center. The part is provided with a screw hole for fastening the tension rod (110).

The engagement of the end plate (41), the main bar (44) and the tension bolt (130) of the end fitting (40) is the same as described above. Further, the tension bolt (130) screwed to the end plate (41) and the tension plate (120) are engaged with each other by tightening the tension bolt (130) at the portion of the gourd-shaped engagement hole (123) of the tension plate (120). The tension plate (1
It is engaged by turning and pulling 20).

Further, one end of the tension rod (110) is screwed into the fastening screw hole at the center of the tension plate (120), and the other end of the tension rod (110) is connected to the form (50). ) Rod hole (1) of the fixing plate (151a) at the end
It is made to project outside the formwork (50) through 57). The lock nut (155) is locked to the fixed plate (151a) by the lock nut (155) screwed to the projecting end, and the lock nut (155) is tightened after the reinforcement bar (45) is tensioned through this rod.
And tighten the rebar cage (45) to the form (50) under tension.

When removing concrete such as piles molded from the mold (50), the locking nut (155) is used.
Is loosened, and the tension rod (110) and the tension plate (120) are manually operated or the like to give the opposite operation to the disengagement, and the mold is released.

The tension bolts (130) directly engaged with the fixing plate (151b) are to be removed from the end fittings before the mold release.

The length of the pile or the like manufactured by the above-described manufacturing is the end metal fittings (40) (40).
In general, the length of the mold (50) is longer than the length of the pile or the like to be manufactured.

[0018]

Since concrete pillars such as piles to be produced have various lengths and have different diameters, a formwork (50) suitable for the length of each pile or the like.
In the case of manufacturing by using, the number of molds to be possessed becomes enormous, the cost is accordingly increased, and the rotation rate of the mold (50) is deteriorated, which is not economical.

To avoid this, when manufacturing piles of various lengths with a mold of constant length, tensioning rods of different lengths are used, or the ends of the rods have male and female threads. The lengths are adjusted by adding or removing rods of a certain length that are formed on the screws and can be screwed together.

However, it takes a lot of time to prepare for the replacement of tension rods having different lengths, and even when the rods are replenished and used, it takes time and labor to replenish and remove the rods, which delays the manufacturing time. is there. In particular, since the connection between the tension rods and the tension rods is simply a screw connection, only rotation in a certain direction (for example, right rotation about the axis or left rotation) is transmitted.

For example, if the tension plate (120) and the tension bolt (130) screwed into the end fitting (40) are screwed by rotating the tension plate (120) to the right, tension can be applied when releasing the mold. The plate (120) is rotated counterclockwise, but when the tension rods connected to each other are connected with the right screw, the plate cannot be rotated counterclockwise (the screw will be loosened). By rotating the protruding rod end, the tension plate (120) cannot be rotated, and the tension rod and the tension plate are also screw-fastened and therefore loosened, so that after removing the upper formwork (50a). However, there is a drawback in that it involves dangerous and complicated work such as approaching the connecting portion such as the tension plate (120) by hand.

Particularly, in the above-mentioned tension rod extension, even when female threads are respectively cut at both ends of the inner hole of the coupling and the rods are screwed and fastened thereto, rotation is transmitted depending on the rotation in the screwing direction. Although you can,
In the case of rotation in the other direction, the fastening will be loose.

The present invention has been made in order to solve the above-mentioned problems, and can easily add and remove the tension rods when the pile length produced is changed, and the operation can be easily performed. Is easy to automate,
An object of the present invention is to provide a manufacturing apparatus capable of efficiently manufacturing concrete piles and the like, and a threaded coupling for connecting a tension rod used for the manufacturing apparatus.

[0024]

A concrete pile manufacturing apparatus according to the present invention has a tension plate connected to one end of a coupling and a tension rod connected to the other end of the coupling. A tension rod device is configured by screw-connecting to a lock state capable of transmitting rotation, and the tension rod device is installed at an end portion in a mold, and the tension rod device is pulled to engage adjacent to the tension plate. It is characterized in that it is formed so as to give a tension force to the rebar cage in the formwork.

Further, in the above description, a plurality of tension rods are used, and one end of one tension rod is connected and fixed to one end of one coupling, and another tension is attached to the other end of this coupling. The rods are screw-connected to each other in a locked state where left and right rotations about the axis can be transmitted, a plurality of tension rods are sequentially connected, and one end of the one tension rod is connected to a coupling having a tension plate. A tension rod device can also be constructed.

As a means for connecting the tension rod with the coupling by screwing, an engagement groove is provided at the threaded end of the tension rod, and an engagement key provided on the coupling so as to be slidable in the axial direction is engaged. It is preferable that the tension rod and the coupling are screw-connected to each other in a locked state so that the left and right rotations about the axis can be transmitted by being locked in the groove.

Further, the threaded coupling of the present invention comprises:
A slidable slide ring was provided on the outer circumference of a cylinder having an internal thread at its end, and an engagement key slidable in the axial direction through an axial guide groove of the cylinder was fixed to the slide ring. It is characterized by that. It is preferable that the slide ring is biased in one direction by a spring.

[0028]

[Operation] According to the present invention, tension rods and tension plates of various lengths are screw-connected to each other by a coupling so that left and right rotations about an axis can be transmitted to form a tension rod device. Even when manufacturing length piles, etc.,
By adjusting the length of the tension rod device, it is possible to manufacture the mold with a fixed length.

In particular, in the tension rod device, the coupling used for connecting the tension rods can be screwed into a locked state in which left and right rotation about the axis can be transmitted. It can be rotated in one direction and fastened with screws, and when the mold is released from the mold end, if the tension rod is rotated in the opposite direction, the rotation is surely transmitted to the tension plate.

Further, in the case where the threaded end of the tension rod is provided with an engagement groove and the engagement key provided slidably in the axial direction of the coupling is locked in the engagement groove, the tension rod of the tension rod is When the screwed end is screwed into a certain position with respect to the coupling, the engagement key automatically engages with the engagement groove and is held in the locked state, and the left and right rotation transmissions are connected.

The coupling used in the rod device is provided with a slidable slide ring on the outer periphery of a tubular body having an internal thread at its end, and passes through an axial guide groove in the tubular body to axially move the coupling. When the slidable engagement key is fixed to the slide ring, the end of the tension rod is moved to one end of the coupling while the engagement key is biased to the other side by the slide ring. When the slide ring is slid to one end side with the tip reaching a predetermined position, the engagement key can be fitted and engaged in the engagement groove. It can be held in a locked state where rotation can be transmitted.

Particularly, when the slide ring is biased in one direction by a spring, the slide ring is pushed against the biasing force of the spring, and the engagement key fixedly mounted on the slide ring is pushed to the other side. If the pushing operation is released after the rod is screwed in, the slide ring moves in the engaging direction by the urging force of the spring, and the engaging key automatically engages with the engaging groove. Will be held in a locked state.

[0033]

Embodiments of the present invention will now be described with reference to the drawings. In addition, regarding the mold (50) for centrifugal molding, the reinforcing bar cage (45) set therein, the respective main bars (44), the respective end metal fittings (40), and the connection structure between these, Since it is the same as that described in the above-mentioned conventional technique, the same members and parts are designated by the same reference numerals, and the description thereof will be omitted.

First, the threaded coupling (1) used in the construction of the tension rod device in the manufacturing apparatus of the present invention will be described.

As shown in FIG. 1, the coupling (1)
Has a cylindrical body (3) as its main body and a slide ring (2) loosely fitted to the outside thereof, and inner screws (9a) (9b) are provided on the inner circumference of both ends of the cylindrical body (3). ing. An axial slotted guide groove (5) is provided at a substantially central portion of the tubular body (3) facing each other, and an engagement key (4) radially penetrating the guide groove (5) slides. It is fixed to the ring (2) by screwing or the like and is provided so as to be movable in the axial direction in the guide groove (5) along with the movement of the slide ring (2).

Reference numeral (6) is a spring, which is interposed between the slide ring (2) and a flange portion (2a) fixedly provided on the outer periphery of the cylindrical body (3). Is urged toward the other end side so that the engagement key (4) is brought closer to the other end side (left side in the drawing) of the guide groove (5).

Reference numeral (10) is a tension rod connected by the coupling (1), and the inner screw (9) is provided at both ends.
a) (9b) are formed with external screws (13a) (13b), and a distal end surface is provided with a radial engagement groove (11) into which an engagement key (4) can be fitted. There is.

A case where the tension rods (10) (10) are connected to each other by the coupling (1) will be described with reference to FIGS.

One (right side of the drawing) tension rod (10)
Is a state in which the end portion on which the outer screw (13b) is formed is brought closer to the other end side (the inner screw 9a side) of the coupling (1) by the biasing force of the spring (6). Then, the coupling groove (11) is screwed into the inner screw (9b) on one end side of the coupling (1) to position the engagement groove (11) on the distal end surface in correspondence with the engagement key (4), and the tubular body (3). Pin hole (8)
And the pin holes (12) of the tension rod (10) are matched, and the locking pins (7) are fitted and locked in these pin holes (8) and (12). As a result, the tension rod (10) is connected and fixed to one end of the coupling (1) (FIGS. 2 and 5).

Further, as shown in FIG. 3, in the state where the tension rod (10) is screwed into the inner screw (9b) of the coupling (1) by utilizing the engaging groove (11) provided on the rod tip surface. , The engaging groove (1) through the coupling (1)
It can also be connected and fixed by fitting and locking the locking pin (7a) to 1).

When the other tension rod (10) is screwed in, the slide ring (2) resists the urging force of the spring (6) on one end side (inner screw 9b).
Side) and, for example, the one tension rod (10)
The engaging key (4) is fitted in the engaging groove (11) at the tip, and the outer screw (13) of the other tension rod (10) is inserted.
Engagement in which the end portion where a) is formed is screwed into the inner screw (9a) of the coupling (1), and the tip of the end portion has exceeded the central portion of the guide groove (5) of the coupling (1). When the pushing range against the spring (6) is released when the moving range of the key (4) is reached, the slide ring (2) automatically slides to the other end side by the urging force of the spring (6). Then, the engaging key (4) is fitted into the engaging groove (11) at the tip of the rod.

When the engaging key (4) and the engaging groove (11) are not in the same direction, further rotation of the tension rod (10) causes the engaging groove (1) to move to the engaging key ( When it matches with 4), the engaging key (4) is pressed by the urging force of the spring (6).
Engages in the engaging groove (11). In this case, it is desirable to give a gentle rotation to the rotation of the tension rod (10) on the left side of the drawing, and the direction of rotation of the tension rod (10) may be a direction of retracting from the tension rod (10) on the right side of the drawing.

Thus, the engagement key (4) and the engagement groove (1
The engagement of (1) results in the tension rod (10) being connected in a locked state to the coupling (1) (FIGS. 4 and 5).

Next, the case where the tension rod (10) and the tension plate are connected by the coupling (1) to form a tension rod device will be described with reference to FIG.

Reference numeral (20) is a tension plate having substantially the same diameter as the inner diameter of the mold (50), and as shown in FIG.
The same number as the end fitting (40) shown in FIG. 17 is provided with the same number of gourd-shaped engagement holes (23) in which two large and small holes are connected at the same position as the end fitting (40). The head portion (30a) of the tension bolt (30) screwed to the end fitting (40) is attached to the large hole (2) of the gourd-shaped engagement hole (23).
3a) is inserted and the tension plate (20) is slightly rotated so that the head (30a) is engaged with the small hole (23b) of the gourd-shaped engagement hole (23). There is. In addition, (30b) is an intermediate seat, and the tension bolt (30) is attached to the screw hole (43a) of the end fitting (40).
Is provided so as to be screwed in for a predetermined length.

A short connecting rod (10a) is screwed into the central portion of one side of the tension plate (20) and is fixed by a locking pin (21) so that it cannot be rotated and pulled out. Then, the connecting rod (10a) is screwed into the inner screw (9b) at one end of the coupling (1), and the locking pin (7) is fitted into the pin holes (8) and (12). By doing so, it can be connected and fixed in a state in which it cannot be pulled out and rotated. Of course, the tension plate (20)
Can be connected and fixed to one end of the coupling (1) by welding means or other fixing means, and the tension plate (20) and the connecting rod (10a) may be integrally formed. Further, it may be formed integrally with the coupling (1) as shown in FIG.

At the other end (the end on the left side of the drawing) of the coupling (1) to which the tension plate (2) is connected, another tension rod (10) is attached in the same manner as described above. It is screwed to the inner screw (9a) by the outer screw (13a) at the end portion, and is screwed into a locked state in which left and right rotation around the axis can be transmitted.

The tension rod device thus connected is used by being set at the end of the mold (50) as shown in FIG. 12, and is fixed to the end of the mold (50). In the protruding screw portion (10b) of the tension rod (10) which penetrates the inner hole of the fixed plate (51) and which protrudes outward,
A locking nut (55) that locks with the fixed plate (51) is screwed so as to be tightenable.

FIG. 9 also shows a plurality of couplings (1),
As a configuration example of a tension rod device using a plurality of tension rods (10), the tension rod (on the left side of the drawing) of the coupling (1) to which the tension plates (20) are connected as described above is attached to the tension rod ( 10) is screw-connected to the locked state in the same manner as above, and the other end (left side in the drawing) of the tension rod (10) is connected and fixed to one end of another coupling (1) in the same manner as above. Further, another tension rod (10) is connected to the other end (left side in the drawing) of the coupling (1) in the locked state as described above. In this way, one tension plate (20) and a plurality of tension rods (10) can be connected.

Incidentally, in the projecting screw portion (10b) of the tension rod (10) projecting from the fixing plate at the end of the mold (50) in use, the locking nut (55) for locking the fixing plate in the same manner as above. ) Are screwed together.

FIG. 10 exemplifies a connecting means when a plurality of couplings (1) and a plurality of tension rods (10) are connected to form a tension rod device.

In the figure, two bases (60a) (6
0b) are arranged side by side, and on one of the first bases (60a), there is a slide base (61a) which is slidable in the axial direction.
On this slide base (61a), several sets of rollers (62) for rotatably supporting the tension rod (10) are arranged at intervals in the axial direction, as shown in FIG.
The roller (62) has a motor (6) connected to it.
The tension rod (10) is rotatably driven by 3) and can be rotated by the tension rod (10) supported by the roller (62). The slide base (61a) may be manually slid, but is usually automatically moved in accordance with the screwing action of the tension rod (10) by the rotation of the roller (62) described later.

On the other hand, a pedestal (66) for supporting another tension rod (10) is arranged on the second base (60b) and is close to the side of the base (60a). Slide table (61b) is provided, and this slide table (61b)
A gripping tool (65) that engages with and pushes the slide ring (2) on the outer periphery of the coupling (1) is provided on the top. That is, the tension rod (10) is mounted on the base (66), and the coupling (1) connected to the tension rod (10) is attached to the slide base (61).
When it is placed so as to be positioned above b) and the slide base (61b) is moved in the arrow direction, the gripper (6
5) Coupling (1) Outer slide ring (2)
The slide ring (2) is pushed toward one end against the biasing force of the spring (6), and the engagement key (4) fixedly mounted on the slide ring (2). Within the range of the guide groove (5) to one end side (right side in the drawing).

Therefore, when the tension rod (10) placed on the first base (60a) is rotated and moved in the direction of the arrow (rightward in the drawing) while being set as described above, As described above, the outer screw (13) at the rod tip is screwed into the inner screw (9a) at the end of the coupling (1) on the second base (60b). .. In this way, when it is screwed in to a certain extent, that is, when the tip exceeds the vicinity of the central portion of the guide groove (5) of the coupling (1), the pushing force against the spring (6) by the gripping tool (65) is released. The engaging key (4) moves together with the slide ring (2) in the direction opposite to the pushing direction by the urging force of the spring (6). When the engagement groove (11) at the rod tip and the engagement key (4) are misaligned, the engagement key (4) comes into contact with the rod tip, but the tension rod (10) is further rotated. By doing so, the engaging groove (1) is aligned with the engaging key (4), and the engaging key (4) is fitted into the engaging groove (11) by the urging force of the spring (6) and engaged. Become. In this case, the rotation of the rod may be reversed. The engagement results in the plurality of tensioning rods (10) being connected in a locked condition.

It is desirable that the tension rods (10) and the couplings (1) are locked by the locking pins (7) one by one and handled as a set. To release the connection between the tension rod (10) and the coupling (1), the reverse operation to the above is performed, that is, the slide ring (2) is pushed toward the one end side against the biasing force of the spring (6) and engaged. The key (4) may be disengaged from the engagement groove (11) and the tension rod (10) may be rotated in the direction opposite to the screwing direction.

In this way, a plurality of tension rods (1
0) is connected by the coupling (1), and the tension rod device is used by setting it at the end of the mold (50) as shown in FIG. 13, for example. An example of connecting and using a tension rod (10) of a book is shown. In this case as well, the protruding screw portion (1) of the tension rod (10) protruding outward from the fixing plate (51) at the end of the mold (50).
0b), the locking nut (55) is screwed in the same manner as above.

The connection of the tension rod (10) with the coupling (1), the tension plate (20), etc. is not limited to the above-mentioned embodiment, and, for example, an apparatus or the like for performing the same operation as described above is operated in the mold. And may be connected by using another tool.

Next, a method of manufacturing a concrete column by the manufacturing apparatus using the above tension rod device will be described with reference to FIG.
And it demonstrates based on FIG.

As described in the prior art, the rebar cage (4
5) at both ends, the heading end (44) of the main bar (44)
The end fitting (40) is attached so that (a) is locked in the tapered small hole (43b) of the end plate (41). A tension bolt (30) is screwed into the bolt screw hole (43a) of the end plate (41) up to the intermediate seat (30b) of the bolt. The rebar cage (45) set in this way is installed at a predetermined position on the lower mold (50b).

In the lower mold (50b), the tension rod (1) previously connected by the coupling (1) as described above.
0) and tension plates (20) are set at both ends of the lower formwork (50b), and the heads (30a) of the tension bolts (30) attached to the end fittings (40) are tightened. The large hole (23) of the gourd-shaped engagement hole (23) of the plate (20)
The rebar cage (45) is installed between the tension plates (20) and (20) so as to be positioned corresponding to a).

Next, an external force is applied from the outside of the end of the mold (50) to push the tension rods (10) (10) toward the rebar cage (45), and the tension bolt ( Three
0) the head of the gourd-shaped engagement hole (23) large hole (2
3a), and the head of the tension bolt (30) is projected outward from the tension plate (20).

In this state, the tension rod (10) is operated from the outer end of the form (50) of the tension rod (10).
When the tension plate (20) is rotated to the right slightly, the tension bolt (30) causes the tension bolt (30) to gourd-like engagement hole (23).
Engage with the small hole (23b) of the.

When the tension rod (10) is pulled in this state, a tension force is applied to the rebar cage (45) and the locking nut (5)
By tightening (0), the tension rod (10) is fixed to the fixing plate (5
It is locked in 1).

When pulling the tension rod (10), as shown in FIG. 12, a tension device (K) constituted by a hydraulic cylinder or the like provided adjacent to the end of the form (50). Then, the end of the tension rod (10) is gripped or screwed, and the hydraulic cylinder or the like is actuated in the axial direction to pull the reinforcing rod cage (45). The reaction force to pull is the formwork (50)
Shall be taken.

With the above, the setting of the rebar cage (41), the tensioning device (K) and the form (50) by the device of the present invention is completed.
After that, a predetermined amount of fresh concrete is filled in the lower formwork (50b), and the upper formwork (50a) is covered and closed as shown in FIG. 14, and then the upper formwork (50a) and the lower formwork (50b). ) Is fastened to the flange (52), the mold (50) in the above state is placed on the centrifugal molding device, the mold (50) is subjected to high-speed rotation for centrifugal molding, and then steam curing is performed. ..

The demolding is performed by the reverse operation to the above. First, the tension of the tension rod (10) is loosened, that is, the fixing plate (5) is released.
1) Loosen the locking nuts (55) that have been locked,
5) Pre-stress concrete columns such as piles due to the shrinking force.

Next, when the tension rod (10) is slightly rotated counterclockwise from the outer end of the mold (50) in the opposite direction,
The rotation is transmitted to the tension plate (20) via the coupling (1) screw-connected in the locked state, the tension plate (20) rotates counterclockwise, and the tension bolt (30) causes the gourd-shaped engagement hole ( 23) from the small hole (23b) to the large hole (23b)
Moving to a) and pulling the tension rod (10) outward in this state, the head of the tension bolt (30) is pulled out from the engagement hole (23). Therefore, the demolding operation can be performed from the outside of the end of the mold.

The tension bolts (30) engaged with the end fittings (40) of the pile or the like are removed after the pile or the like is removed from the mold (50).

In the manufacturing apparatus shown in FIGS. 12 and 13, the tension rod (10) and the tension plate (20) are connected to the both ends of the mold (50) by the coupling (1). Although the case where the apparatus is equipped is shown, about one end, the tension rod is directly connected and fixed to the tension plate, and the tension rod is fixed to the fixing plate at the end of the mold, as in the conventional apparatus shown in FIG. It is also possible to make it more prominent.

[0070]

According to the present invention, tension rods and tension plates of various lengths can be made to have a constant length by adjusting the length of the tension rod device even when manufacturing piles of various lengths. Since it can be manufactured with the molds of the wood, the number of the molds to be held is small and it is economical, and the rotation efficiency of the molds is improved.

Further, the tension rod and the tension plate can be easily connected to each other by using a coupling with a screw, and the tension bolt screwed into the end fitting in the mold and the tension plate can be engaged and disengaged. It can be done simply and safely by simply turning the tension rod outside the end.

The mechanism for connecting and disconnecting the coupling and the tension rod is simple, and is optimal as an automated manufacturing apparatus.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a coupling according to the present invention.

FIG. 2 is a plan view showing a state in which a rod is connected and fixed to one end side of the above coupling.

FIG. 3 is a cross-sectional view showing another example in which a rod is connected and fixed to one end side of a coupling.

FIG. 4 is a transverse cross-sectional view of an engagement key portion in a rod connected state by the coupling described above.

FIG. 5 is a vertical sectional view of the above.

FIG. 6 is a cross-sectional view showing a disassembled part of a case where a tension plate is connected to a coupling and showing a part thereof in a half section.

FIG. 7 is a cross-sectional view when a coupling and a tension plate are integrally formed.

FIG. 8 is a front view of a tension plate.

FIG. 9 is an explanatory diagram for connecting a plurality of tension rods.

FIG. 10 is a schematic plan view illustrating a connecting operation means of the tension rod of the same.

FIG. 11 is a schematic sectional view of a roller portion of the above.

FIG. 12 is a plan view on one end side of the mold showing a manufacturing apparatus in which the mold is equipped with a tension rod device.

FIG. 13 is a plan view of the other end side of the above.

FIG. 14 is a transverse cross-sectional view showing the same internal mechanism as omitted.

FIG. 15 is a partially cutaway plan view of a manufacturing apparatus equipped with a conventional tension rod device.

FIG. 16 is a front view of the above-mentioned one end side.

FIG. 17 is a vertical sectional view (a) and a front view (b) of the end fitting.

[Explanation of symbols]

 (1) Coupling (2) Slide ring (3) Cylindrical body (4) Engagement key (5) Guide groove (6) Spring (10) Tension rod (11) Engagement groove (20) Tension plate (21) Engagement Stop pin (23) Gourd-like engagement hole (23a) Large hole (23b) Small hole (30) Tension bolt (40) End fitting (45) Reinforcing bar cage (50) Form (50a) Upper form (50b) Lower form Frame (51) Fixed plate

Claims (5)

[Claims] 1. A tension rod device in which a tension plate is continuously provided at one end of a coupling, and a tension rod is screwed at the other end of the coupling in a locked state capable of transmitting left and right rotation about an axis. The tension rod device is installed at the end of the mold, and the tension rod device is pulled to form a tension force on the reinforcing bar cage in the mold that is adjacently engaged with the tension plate. Equipment for manufacturing concrete piles, etc. 2. A plurality of tension rods, wherein one end of one tension rod is connected and fixed to one end of one coupling, and another tension rod is connected to the other end of this coupling. Is screwed into a locked state that can transmit left and right rotation about the axis, and sequentially connect multiple tension rods,
The apparatus for manufacturing a concrete pile or the like according to claim 1, wherein an end portion of the one tension rod is connected to a coupling in which tension plates are continuously provided to form a tension rod device. 3. An engagement groove is provided at a threaded end portion of a tension rod screwed into the coupling and connected, and an engagement key slidably provided in the coupling in the axial direction is locked in the engagement groove. The apparatus for manufacturing a concrete pile or the like according to claim 1 or 2, wherein the tension rod and the coupling are screw-connected to each other in a locked state so as to be able to transmit left and right rotation about an axis. 4. A slidable slide ring is provided on the outer periphery of a tubular body having an internal thread at an end thereof, and the engagement key slidable in the axial direction through the axial guide groove of the tubular body is slid. A coupling with a screw that is fixed to the ring. 5. The slide ring on the outer circumference of the cylinder is biased in one direction by a spring.
Coupling with screw described in.