JP2681206B2 - Equipment for manufacturing concrete piles and tension rod device used for the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a PC concrete pile for supporting a structure,
The present invention relates to a manufacturing device for PC concrete poles used for electric poles and the like, and a tension rod device with adjustable length used for the device.

[Prior Art] Generally, when manufacturing piles such as cylindrical PC concrete piles, PC concrete poles, or concrete piles with knots into which prestress is introduced, or piles such as poles, the following is usually done. Will be performed.

As shown in FIG. 8 and FIG. 9, the core rebar cage (41) is set in the lower formwork (32) of the formwork (K) which is divided into upper and lower semi-cylindrical parts, and the lower formwork. After filling a predetermined amount of fresh concrete into the (32) and covering it with the upper formwork (31) and closing it, the flange parts (31) of the upper formwork (31) and the lower formwork (32) are closed.
a) Conclude with (32a). Both ends of the form (K) are sealed by fixing plates (35a) (35b), and a centrifugal tire (3) for transmitting rotation at required intervals in the axial direction is provided on the outer periphery of the form (K).
4) is provided.

After that, the reinforcing rod cage (41) and the tension rod (8) set at the end of the form (K) in advance are pulled in the axial direction from the outside of the form (K), and the inner reinforcing cage (41) is pulled. The tension rod is attached to the end fixing plates (35a) and (35b) of the form (K) with nuts, and the form (K) is centrifuged. It is placed on a molding device, the mold is subjected to high-speed rotation for centrifugal molding, and then steam curing is performed.

Then, at the time of demolding, the tension of the tension rod (8) is loosened, and the concrete is pre-stressed by the force of the rebar cage (41) to shrink to manufacture a PC concrete pile, pole, and the like.

In the above manufacturing, the rebar cage (41) inside the form (K)
To give tension to a person, it is usually done by the following means.

The main bar (41a) of the rebar cage (41) is cut to a certain length,
Each end is headed or screwed, and is connected to the hoop muscle (43) wound around the outer circumference and knitted into a cage.

The end fittings (39) of the concrete pile are engaged with both ends of the main reinforcement (41a) of the reinforcing rod cage (41). As shown in, for example, FIG. 10, the end fitting (39) is formed by an end plate (39a) and a side plate (39b) and has a cap shape. A gourd-shaped fastening hole (39c) having a series of holes is provided at the same position as the main bar (41a). The small hole portion of the fastening hole (39c) is a tapered hole (39d), and a tapered seat for locking the headed end of the main bar (41a) is provided. The large hole portion is for a bolt. The threaded hole (39e) engages with a tension bolt (40) described later.

Further, the fixing plate (35a) provided at one end of the mold (K) has a gourd-shaped engagement hole (36a) similar to the above which the tension bolt (40) engages with. ) And the same number are provided at corresponding positions.

Then, at one end side end of the rebar cage (41), one heading end of each main rebar (41a) is inserted through the large hole of the end plate (39a), that is, the bolt screw hole (39e). The end plate (39a) is slightly rotated, and the end plate (39a) or the reinforcing bar cage (41) is pulled to lock the heading end of the main bar (41a) to the seat of the tapered hole (39d).

In addition, a tension bolt (40) is screwed into the bolt screw hole (39e) with a certain length left from the bolt head,
The head of the tension bolt (40) is inserted through the large hole portion of the gourd-shaped engagement hole (36a) of the fixing plate (35a) and slightly rotated to pull the rebar cage (41), and the tension bolt (40) is pulled. The head of (40) is connected to the periphery of the engaging hole (36a), that is, the fixing plate (3
Engage with 5a).

Further, at the other end of the main bar (41a) of the rebar cage (41), the inner diameter of the mold (K) is approximately the same as the inner diameter of the mold (K) at a slight distance from the end fitting (39). A tension plate (38) is arranged. As shown in FIG. 11, the tension plate (38) is provided with the same number of gourd-shaped engaging holes (36) as the fixing plate (35a) at the same position as the main bar (41a), and its center portion. The fastening screw hole (38) for fastening the tension rod (8)
a) is provided.

Then, the end plate (39a) of the end fitting (39) and the main bar (41
The end of a) and the engagement with the tension bolt (40) are the same as above. Further, the tension bolt (40) screwed to the end plate (39a) and the tension plate (38) are engaged with each other by the fixing plate (35).
It is carried out in the same manner as the engagement between a) and the tension bolt (40).

Further, one end of the tension rod (8) is screwed into the fastening screw hole (38a) of the tension plate (38), and the other end of the tension rod (8) is connected to the form (K). The other fixing plate (35b) is made to project to the outside of the form (K) through the rod hole (37). The reinforcing nut (42) is locked by the fastening nut (42) screw-set on the protruding end, and the reinforcing rod cage (41) is tensioned by appropriately tensioning the tensioning rod (8) with a tensioning device. After that, tighten the nut (4
2) Tighten and tighten the reinforcing rod cage (41) and the tension rod (8) to the formwork in a tensioned state.

Although the tension is applied as described above, the length of the pile manufactured by this is between the end fittings (39) (39), and in general, the length of the formwork (K) is shorter than the pile length manufactured. It's getting longer.

[Problems to be Solved by the Invention] When there are various pile lengths to be manufactured, a mold (K) suitable for the length of each pile may be used.
The number of molds to be possessed becomes huge, the cost is high, and the turnover ratio of the mold (k) is poor, which is not economical.

In order to avoid this, tensioning rods (8) having different lengths are used, or a rod of a certain length which is formed at each end with a male screw and a female screw and can be screwed is added or removed. I am adjusting the length by
There is a drawback in that preparation for replacement of the tension rods (8) having different lengths is troublesome, and even if the rods are replenished and removed, the same time and labor are required as described above and the manufacturing time is delayed.

In addition, the cost of preliminarily preparing various rods and rods not used in the current process is also great, and various problems such as requiring a large storage space in the manufacturing factory to equip them are also required. However, it is not suitable for automation of manufacturing equipment for this kind of concrete pile.

The present invention has been made to solve the above problems, and when the pile length to be manufactured is changed, the length of the tension rod can be easily adjusted in a short time, and the concrete pile can be adjusted. The present invention aims to provide a manufacturing apparatus capable of efficiently manufacturing and a tension rod apparatus having an adjustable length used for the manufacturing apparatus.

[Means for Solving the Problems] As a means for solving the above-mentioned problems, the manufacturing apparatus for concrete piles and the like according to the present invention has, as one means for solving the above-mentioned problems, a mold shaft at one end of a centrifugal molding mold such as a pile. It is characterized in that a tension rod device which can be expanded and contracted in a certain direction and which can be adjusted to a predetermined length is provided, and a tension force is applied to the rebar cage in the form via the tension rod device.

Further, the above-mentioned tension rod device with adjustable length is telescopically expandable and retractable between one end rod connectable to a tension device and the other end rod engageable with a reinforcing bar cage side tension plate. The present invention is characterized in that a multiple case, which is fitted and adjustable to a predetermined length, is interposed so that the length can be easily adjusted and used by expanding and contracting the multiple case.

[Operation] According to the present invention having the above-described structure, the tension rod device is expandable and adjustable and can be adjusted to a predetermined length. Therefore, the tension rod device can be used as a tension rod device depending on the pile length to be manufactured. The length can be easily adjusted by expanding and contracting the length adjusting portion, and even if there are various pile lengths, the length can be changed and adjusted in a short time.

Particularly, according to the tension rod device in which the length-adjustable multiple case having the telescopic shape is interposed between the rods at both ends, one end side rod is made to protrude from the fixing plate at one end of the mold. The length of the multiple case can be adjusted by expanding and contracting while the other end side rod is in the set state in which the rod is engaged with the reinforcing plate on the side of the rebar cage, and the adjustment can be easily performed.

[Example] Next, an example of the present invention will be described with reference to the drawings.

In addition, the mold (K) for centrifugal molding, the rebar cage (41) set inside this, each main bar (41a), and the end fittings (3).
Regarding each structure of 9) and their connecting structure,
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 tension rod device (A) of the present invention has the following configuration.

In FIGS. 1 to 4, (C) is a multiple case interposed between the one end side rod (8a) and the other end side rod (8b) constituting the tension rod device (A), and this is a tension case. It is a length adjusting portion for adjusting the locking length of the rod device (A). The multiple case (C) is telescopically expandable and insertable so as to fit the outer case (1) and one or more inner cases (2a) (2b) (2c) inside the outer case (1). The length can be adjusted by pulling out. When each of the outer case (1) and the inner cases (2a) (2b) (2c) is a case having a circular cross section as shown in FIG. 4, the outer case (1) rotates together with the form (K). And is fixed or circumferentially engaged with the inner surface of the mold by appropriate means (1a).

On the inner surface of one end of the outer case (1) and the inner cases (2a) (2b) (2c), engaging rings (5) (5a) having a constant thickness are formed.
(5b) and (5c) are fixed, and further engagement rings (5) and (5a)
Fastening screw holes (6) are provided in the center portions of (5b) and (5c), and they are sequentially engaged with the ends of the one end side rods (8a) by screwing means. Outer ring stoppers (4a) (4b) (4c) that are loosely fitted in the outer case are provided on the outer surfaces of one ends (right ends in the drawing) of the inner cases (2a) (2b) (2c).

Outer case (1) and inner case (2a) (2b)
Inner ring stoppers (3) (3a) loosely fitted to the inner case on the inner surface of the other end of (2c) (left end in the drawing).
Inner case (2a) (2b) (2c) provided with (3b) (3c)
The outer ring stoppers (4a), (4b) and (4c) become inner ring stoppers (3) and (3a) when each of them extends.
(3b) and (3c) are abutted to each other so as to have a predetermined length. For example, the outer ring stopper (4a) contacts the inner ring stopper (3).

Further, the inner ring stopper (3c) of the innermost inner case (2c) is provided with an inner screw (10), and the other end side is the side of connection with the reinforcing rod cage (41) of the tension rod device (A). It is screwed to the end of the rod (8b).

Although the strokes of the extending inner cases (2a), (2b), and (2c) are different from each other, a certain unit length in the stretched state, for example, the pile length to be manufactured usually changes in units of m. , 1m, 2m, etc., to adjust the fixed unit length, the dimensional difference between the stroke of the inner case (2a), (2b) and (2c) and the fixed unit length can be calculated using the inner ring stopper of the inner case (2c). The rod (8b) screw-fastened to (3c) is axially taken out and put in by screwing or the like for adjustment.

Incidentally, (44) is an adjusting tightening nut for preventing the positional deviation of the rod (8b) after the adjustment.

Further, the rod (8a) on one end side of the tension rod device (A), which is the connection side with the tension device to be described later, is made up of a rod provided with a threaded portion such as a square screw at the full length or the engaging portion, and one end thereof. Outer case (1) and inner case (2a) (2b)
Respective engagement rings (5) (5a) (5b) (5) of (2c)
c) is screwed so that the side surfaces are brought into contact with each other in sequence, and the other end is provided so as to project to the outside from the fixing plate (35b) provided at the end of the form (K), and the material is projected. A fastening nut (42) is screwed to the portion.

The rod (8b) on the other end side of the tension rod device (A) is composed of a rod having a threaded portion such as a square screw provided at the entire length or an engaging portion, and one end has the inner case (as described above). 2
The inner ring stopper (3c) in c) is screwed, and the tension plate (38) is fastened to the other end.

In the tension rod device (A) whose length is adjustable by the multiple case (C) of the illustrated embodiment, the inner cases (2a) (2b) (2c) housed in the outer case (1) are connected to one end side. By giving rotation to the rod (8a) from outside the form (K),
The inner cases (2a) (2b) (2c) screwed with the engagement rings (5a) (5b) (5c) are sequentially unfastened from the inside, and the rod (8b) is pulled each time each fastening is released, or By moving the tension rod device (A) in the axial direction, the length of the tension rod device (A) can be adjusted to a predetermined length.

Reference numeral (11) is a locking pin that is inserted from the outer side surface of the engagement ring (5) into the engagement rings (5), (5a), (5b), and (5c) in the rod axial direction. 8a)
The inner cases (2a), (2b), (2c) are locked so that they do not rotate together during rotation operation of the inner case (2a) (2b) (2
c) is provided so that it may be removed from the inside. When contracting each of the extended inner cases (2a), (2b), and (2c), the opposite action is performed.

Each of the outer case (1) and the inner case (2a) (2b) (2c) forming the multiple case (C) can be formed of a case having a rectangular cross section as shown in FIG. The above-mentioned locking pin (11) is unnecessary.

Further, each of the outer case (1) and the inner case (2a) (2b) (2c) may be formed in a box shape with a case having a U-shaped cross section as shown in FIG. In this case, inner ring stopper (3) (3a) (3b) (3c), outer ring stopper (4)
(4a) (3b) (4c), engagement ring (5) (5a) (5b)
Each of the (5c) is formed in a U shape, and the engaging rings (5), (5a), (5b) and (5c) are provided with a fastening screw hole (6).

FIG. 7 shows another embodiment of the multiple case (C), in which the outer ring stoppers (4a), (4b) and (4c) of the inner cases (2a), (2b) and (2c) are spaced by a required distance in the circumferential direction. On the other hand, the outer case (1) and the inner cases (2a) (2b) are provided with a plurality of kerfs (45), and the guide rails (46) corresponding to the kerfs (45) are provided on the shafts of the respective cases. The case is configured so as to be fitted in a spline shape so that when the one end side rod (8a) is rotated, the respective cases are axially displaced and can be adjusted for expansion and contraction without accompanying rotation.

A manufacturing apparatus equipped with the tension rod device (A) having the above-described structure and having a length adjustable, and a method for manufacturing a PC concrete pile by the device will be described below.

In the above tension rod device (A), the one end side rod (8a) protrudes from the fixing plate (35b) inside the one end portion of the lower formwork (32) of the formwork (K), and the other end side rod ( 8b) is screwed and fastened to the tension plate (38).

Then, in the above description of the prior art, the rebar cage (41)
Similar to the case described as the tensioning means of the end bar, first, at both ends of the rebar cage (41), the end bars (39a) are locked so that the main bars (41a) are locked in the tapered holes (39d) of the end plate (39a). ) Is attached, and a tension bolt (40) is screwed and set in the screw hole (39e) for the bolt of the end plate (39a) leaving a certain length from the head.

The heads of the tension bolts (40) to which the reinforcing rod cage (41) in the above state is attached are the large holes of the gourd-shaped engagement holes (36a) (36) of the fixing plate (35a) and the tension plate (38). The fixing plate (35) in the lower formwork (32) is positioned so that it corresponds to the part.
Install it between a) and the tension plate (38).

Next, the rebar cage (41) is fixed with a hanging device or the like (35
Move it in the direction of a), that is, to the left in the figure, and
Insert the head of the tension bolt (40) of 9) through the large hole portion of the gourd-shaped engagement hole (36a) of the fixing plate (35a), and place the head of the tension bolt (40) from the fixing plate (35a). Let it project outside.

In this state, if the length of the PC pile to be manufactured is a predetermined length corresponding to the length of the form (K), as will be described later, the other end side of the rebar cage (41), that is, the right end of the figure. The tension bolt (40) and the tension plate (38) are engaged with each other.

Further, when manufacturing a PC concrete pile shorter than a predetermined length, only the length corresponding to the dimensional difference from the predetermined length is included in one of the inner cases (2), for example, the inner case (2c).
Is unscrewed from the rod (8a) on one end side and extended (Fig. 2).

In this case, rotate the rod (8a) to rotate the engagement ring (5
Remove the screw fastening of the rod (8a) by c), hold the rod (8b) on the other end side so as not to rotate with an external device or manually, and in the direction close to the right end of the rebar cage (41), In other words, pull it to the left in the drawing to remove the inner case (2c).
Pull out. The outer ring stopper (4c) of the inner case (2c) pulled out in this manner engages with the inner ring stopper (3b) of the inner case (2b) on the outer side of the inner ring (2c), and the tension rod device (A) is connected to the inner case (2c). ) The extension is adjusted by the pull-out length. Further, when the inner cases (2b) and (2a) are successively drawn out in the same manner as described above, the inner cases (2b) and (2a) are extended in accordance with the drawn out length of the inner case.

As a result, when the PC pile is in the same state as when it has a predetermined length, in this state, the rod (8b) on one end side of the inner case is pulled and the rod (8a) on the one end side is pushed from the outside. Move. That is, the entire tension rod device (A) is moved to the left in the figure, and the head of the tension bolt (40) at one end is moved to the large hole portion of the gourd-shaped engagement hole (36) of the tension plate (38). Through the tension plate (38) so that the head protrudes to the outside.

In this state, the reinforcing bar basket (41) is slightly rotated so that the end heading portion of the main bar (41a) is located in the small hole part of the gourd-shaped engagement hole (36), and the reinforcing bar basket (41) and the tension rod are tightened. When (8) is moved to the right, the left and right heading ends of the main shaft (41a) are locked in the small holes of the gourd-shaped engagement holes (36) of the fixed plate (35a) and the tension plate (38). Will be done.

After setting as above, the lower formwork (3) of the formwork (K)
2) Fill a predetermined amount of green concrete into the upper formwork (3
After covering with 1) and closing, both upper and lower formwork (31) (32) is fastened with the flange parts (31a) (32a). And reinforced basket (41)
And the tension rod device (A) set between the mold plate (K) and the fixing plate (35b) is pulled from the outside of the mold frame (K) in the axial direction, that is, to the right in the figure.

In this case, since the fixing plate (35a) is locked at the left end heading portion of the main bar (41a) of the internal rebar cage (41), the main bar (41a) extends and the tension force is exerted on the rebar cage (41) when pulled. In this state, the fastening nut (42) screwed to the end of the rod (8a) on one end side is tightened and locked to the fixing plate (35b) at the end of the form (K).

One end side rod (8a) of the tension rod (8)
When pulling the rod, is the end of the rod (8a) held by a pulling device (R) composed of a hydraulic cylinder or the like provided adjacent to the right end of the form (K) as shown in the figure? , The screw is fastened, and the reinforcing rod cage (41) is pulled through the tension rod (8) by axially operating the hydraulic cylinder or the like. The tensile reaction force is taken by the formwork (K).

The mold (K) in the above state may be placed on the centrifugal molding apparatus, and the mold (K) may be subjected to high-speed rotation and centrifugal molding as in the conventional case, and then steam curing may be performed. Then, at the time of demolding, the tension of the rod (8a) is loosened, that is, the fastening nut (42) fastened to the rod (8a) is loosened. Prestressing is applied to the main body. If the tension bolts (40) engaged with the end fittings (39) of the pile are removed and the mold is removed, a PC pile with a predetermined prestress can be obtained.

To remove the tension bolt (40), disengage the fixing plate (35a) from the tension bolt (40) and the tension plate (38) from the tension bolt (40) to remove the pile from the formwork (K). You may go after taking it out.

[Effects of the Invention] As described above, in the present invention, the tension rod device whose length can be adjusted is provided. Therefore, even when there are various pile lengths to be manufactured, the tension is adjusted accordingly. The length of the rod device itself can be adjusted by expanding and contracting. Therefore, it is possible to cope with various pile lengths simply by holding a formwork of a certain length, and the formwork is easy to handle, costs are low, and the formwork rotation rate is good. Target.

In addition, rods of various lengths can be replaced and used according to the pile length to be manufactured, or rods of a certain length that can be screwed together can be added or removed to adjust the length. Compared with the method, the length can be adjusted easily and efficiently in a short time, and the reinforcing bar cage can be easily set in a tension state when manufacturing a pile of any length.

Particularly, according to the tension rod device in which the length-adjustable multiple case telescopically inserted and interposed is provided between the rods at both ends, the tension rod device is installed in the mold and the rod on one end side is fixed to the mold. The length of the multiple case can be adjusted by expanding and contracting from the outside with the set state in which the rod is protruded from the fixed plate at one end and connected to the tension device, and the rod at the other end is engaged with the tension plate on the rebar cage side. Therefore, the adjustment can be performed more easily.

For example, by simply rotating the rod on the one end side from the outside of the mold and adjusting the length, the length can be adjusted to suit the pile length to be manufactured without taking time and effort.

Further, since it is not necessary to replace the tension rods having different lengths and to add or remove the rods as in the conventional method, it can be suitably used for automating the manufacturing apparatus of this kind of concrete pile.

Furthermore, compared to the case where a large number of various rods and rods that are not used in the current process are preliminarily provided, storage space is not taken up,
The device is simple and has the advantage of cost savings.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal plan view showing an embodiment of a manufacturing apparatus equipped with a tension rod device having an adjustable length according to the present invention, and FIG. 2 exemplifies a state in which the tension rod device having an adjustable length is extended. FIG. 3 is a plan view in which a part is longitudinally cut, FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1, FIG. 4 is a vertical cross-sectional view of a tension rod device with adjustable length, and FIGS. FIG. 8 is a partial cross-sectional plan view of a manufacturing apparatus equipped with a conventional tension rod device, FIG. 9 is a side view of the same, and FIG. (A) and (b) are a front view and a longitudinal sectional view of the end fitting, and FIG. 11 is a perspective view of the tension plate. (A) ... tensioning rod device, (C) multiple case, (1) ... outer case, (2a) (2b) (2c) ... inner case, (3) (3a) (3b) (3c) ... … Inner ring stopper, (4) (4a) (4b) (4c) …… Outer ring stopper, (5) (5a) (5b) (5c) …… Engaging ring, (8a) ……
One end side rod, (8b) …… Other end side rod, (11) …… Locking pin, (K) …… Formwork, (31) …… Upper formwork, (32)…
… Lower formwork, (35a) (35b) …… Fixed plate, (36a) (36)
...... Gourd-shaped engagement hole, (37) …… Rod hole, (3
8) ... tension plate, (39) ... end fitting, (39a) ... end plate, (39c) ... gourd-shaped fastening hole, (40) ... tension bolt, (41) ... rebar cage, (41a) …… Main story, (42)
...... Fastening nut.

Claims (3)

(57) [Claims] 1. A tension rod device which is expandable / contractible in the axial direction of the mold and adjustable to a predetermined length is provided at one end of a centrifugal molding mold such as a pile. hand,
An apparatus for manufacturing concrete piles or the like, characterized in that it is configured so as to give a tension force to a rebar cage in a formwork. 2. The apparatus for producing concrete piles according to claim 1, wherein the length adjusting portion of the tension rod device comprises a multiple case telescopically expandably fitted. 3. A telescopically-expandable insert-fitting structure having a predetermined length between one end-side rod connectable to a tension device and the other end-side rod engageable with a reinforcing bar basket-side tension plate. A tension rod device with adjustable length, characterized in that an adjustable multiple case is interposed between the two.