JP2547088B2 - Method for manufacturing concrete pile with PC joint and manufacturing form - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a concrete pile with a PC knot used as a foundation pile for supporting a structure on the ground, and a manufacturing form.

[Prior Art] A conventional concrete pile with cylindrical joints (F ′) (hereinafter, simply referred to as joint piles) is, as shown in FIGS. 19 and 20,
A plurality of nodes (2 ') are provided on the outer circumference of the cylindrical body (1') at predetermined intervals in the axial direction, and end fittings (4 ') (4') are provided at the pile ends. It is usually a crowned one, and is generally used as a friction pile for supporting a structural load by the frictional force of the peripheral surface of the pile.

[Problems to be Solved by the Invention] However, since the conventional joint pile (F ′) has a shape in which no joint portion is provided at both ends, when it is used as a foundation pile, the following cases occur. There are drawbacks.

Gravel, crushed stone, etc. are filled around the node pile (F ') at the time of driving the node pile, and it is used as a friction pile as shown in FIG.
Although the tip supporting force of the pile is expected when the pile tip ground is a hard supporting ground, a large tip supporting force cannot be obtained because the tip cross-sectional area of the pile is smaller than that of the node.

When a plurality of joint piles (F ') are connected to form a foundation pile as shown in Fig. 20, they are connected by welding with end fittings (4') (4 ') at the end of each joint pile. However, the outer diameter of the connecting part is smaller than the diameter of the knot, and the bending strength is weak.

In particular, when a horizontal force is applied to the upper part of the node pile (F ') placed in the ground, the node part (2') having a larger diameter than the trunk part (1 ') acts as a support point for the ground. Therefore, when a plurality of joint piles (F ') are used in combination, it is desirable to joint them with joints having a large cross-sectional performance, which makes it possible to construct a foundation pile that is safer and stronger against horizontal forces. As described above, the pile (F ') has the end fitting (4') attached to the end of the pile having the same diameter as the trunk (1 '), and can be connected at the node. Not not.

Therefore, the object of the present invention is to obtain a sufficient tip supporting force, excellent bending strength of the joint portion between the node piles, a new method of manufacturing a knotted concrete pile that is safer and stronger against horizontal force, In particular, it is to provide a manufacturing method and a manufacturing form suitable for manufacturing a concrete-clad concrete pile with a prestressed pile body.

[Means for Solving the Problem] In the method for producing a concrete-clad concrete pile according to the present invention for solving the above-mentioned problems, node forming portions are formed at a plurality of axial positions at predetermined intervals in the mold axial direction. Using the cylindrical formwork provided, in the nodal part forming part of the formwork located at the end part of the nodal pile to be manufactured, from the end plate and the peripheral edge of the inner diameter of the nodal part forming part of the formwork Insert the cap-shaped end fittings for the knots, which are composed of the extended cylindrical side plates, so that the cylindrical side plates are located on the outer peripheral portion of the molding part of the knot portion excluding the inclined side surfaces. With setting
A reinforced basket is set in a cylindrical form, and after that, the inside of the form is filled with ready-mixed concrete and a tensile force is applied to the main bar of the reinforced basket to manufacture a pile by rotational centrifugal molding.

In the above-mentioned manufacturing method, the locking hole provided in the end plate of the end fitting fitted and set in the knot-shaped part is locked with the main bar constituting the rebar cage set in the formwork,
The tension can be applied to the main bar to manufacture the pile.

In addition, the end of the main bar that constitutes the rebar cage set in the formwork is positioned slightly inward from the end plate of the end fitting that is fitted and set in the knot part molding side, and the main bar is It is also possible to manufacture the pile in such a way that it gives tension.

In the above-mentioned manufacturing method, the knot-shaped part to be fitted and set in the end fitting is usually a knot-formed part provided on at least one end of the mold. Alternatively, one or two end fittings may be fitted and set in one of the knot forming portions in the axially intermediate portion of the form at a slight interval.

Furthermore, the formwork for producing the above-mentioned concrete knotted concrete pile is provided with a plurality of knotted part molding parts at predetermined intervals in the axial middle part of the cylindrical formwork, and at least one of the formwork end parts. Also, it is characterized in that it is provided with a knot portion molding portion. In this case, the diameter of the node forming portion at the end of the pile into which the end fitting is fitted can be formed to be larger than the diameter of the other node forming portion.

[Operation] According to the above-described manufacturing method of the present invention, in the knotted portion of the mold located at the end of the knotted pile to be manufactured, the cap-shaped member having a diameter substantially the same as the inner diameter of the knotted portion is formed. The end fittings for the knots are fitted and set so that the cylindrical side plates are located on the outer peripheral portion of the knots of the mold excluding the inclined side surfaces, so that the cylindrical molds are closed. In the case of filling with ready-mixed concrete, when applying tension to the reinforcing bar cage main bar, or during rotational centrifugal molding, the end fittings are not tilted or excessively displaced and are securely held in place. It

For example, as claimed in claim 2, the main hole forming the rebar cage is locked in the locking hole provided in the end plate of the end fitting,
When tension is applied to the reinforcing bar cage main bar, even if the end fitting may move in the pile axial direction as the main bar extends, or as in claim 3, the end plate of the end fitting may have a side plate extension side rather than the end plate. Even when tightening the main bar with the ends positioned inward, the end fittings have cylindrical side plates that are fitted to the outer peripheral part of the node forming part excluding the tapered side surface parts. When it moves in the axial direction, it comes into contact with the side surface of the molded part of the knot to restrict the movement in the axial direction, and it is held so that it does not move at all, or the movement beyond a certain range is restricted and the specified position Held in. Further, even if the main bar touches the insertion hole of the end fitting during tensioning of the main stick, there is no risk of the end fitting being displaced or tilted.

Therefore, concrete with PC joints has joints at multiple locations including the axial middle portion and at least one counter-edge portion, and end fittings are accurately crowned on the joints of at least one pile end without tilting. The pile can be easily obtained by centrifugal molding. Moreover, in the concrete pile with PC joints manufactured in this way, it is possible to weld and connect the end fittings of the joints, and in such a case the connection cross-sectional area becomes large, and the one that has a large bending resistance against horizontal force can get.

Further, by using the manufacturing form according to claims 6 and 7, the above manufacturing method can be easily carried out, and a node portion is provided in the axially intermediate portion and at least one end portion, and the end portion of the end portion is formed. It is possible to reliably manufacture concrete piles with joints where end fittings are attached to the joints.

In particular, as in claim 7, by using a mold in which the diameter of the node forming portion at the pile end position into which the end fitting is fitted is larger than that of the other node forming portions, the node portions of the pile ends are used. It is possible to manufacture concrete piles with nodes having a large diameter.

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

FIG. 1 shows a concrete pile with joints (F) manufactured according to the present invention, in which a plurality of joints (2) having a diameter larger than that of the trunk (1) are arranged at predetermined intervals in the pile axial direction. It is provided at a plurality of places including the intermediate portion in the axial direction, and one or both end portions of both piles are also provided with a node portion (3) as shown in the drawing,
A cap-shaped end fitting (4) including an end plate (4a) and a side plate (4b) is attached to the end node (3).

FIG. 2 shows an example of a mold (K) as a manufacturing method and manufacturing apparatus for the concrete pile with nodes (F) of FIG. 1 described above. Based on this, a case will be described below in which a so-called PC joint concrete pile (F) in which prestress is introduced into the pile body (hereinafter, simply referred to as joint pile in the description of the examples) is manufactured.

First, the manufacturing formwork (K) used for this is composed of a separable cylindrical formwork (K) divided into upper and lower semicircles, and corresponds to the node pile (F) to be manufactured. , A plurality of knot-shaped parts (32) having a diameter larger than that of the body part (31) are provided at an axially intermediate portion at a predetermined interval in the axial direction of the form, and also at both ends of the form. Knot shaped part (33) (33)
Is provided. These knot shaped parts (32) (33)
Has a taper-shaped inclined surface inclined with respect to a surface perpendicular to the axis as shown in the figure. Both ends of the mold (K) are closed by fixing plates (10) (10), and a centrifugal tire (36) for transmitting rotation is provided on the outer periphery of the mold (K) at every axial required interval. There is.

Then, in this embodiment, the end fittings (4) and the rebar cages (B) to be crowned to the pile ends are set in the cylindrical form (K) by the following production, and the tension is applied. Given.

That is, the main bar (20) of the rebar cage (B) is cut into a fixed length, and each end is headed and knitted into a cage with the hoop bar (24) and the like. (21) in the figure shows the heading portion.

The end fitting (4) is formed by an end plate (4a) having substantially the same diameter as the inner diameter of the mold forming portion at the position where the end fitting (4) is fitted, and a cylindrical side plate (4b) extending from the peripheral edge of the end plate (4). As shown in FIG. 4, the end plate (4a) has
Gourd-like fastening hole (4c) in which two large and small holes are connected
However, the same number is provided at the same position as the main bar (20).
The small hole part of this fastening hole (4c) is a taper hole (4d)
A tapered seat is provided so that the heading portion (21) of the main bar (20) is locked, and the large hole portion has a screw hole for a bolt having a diameter through which the heading portion (21) can be inserted ( 4e), which is adapted to engage a tension bolt (12) described later.

That is, the heading portion (21) of the main bar (20) is inserted through the large hole of the end plate (4a), that is, the bolt screw hole (4e), and the end fitting (4) is slightly rotated to end the end portion. When the metal fitting (4) or the rebar cage (B) is pulled, the heading portion (21) is locked to the seat of the tapered hole (4d).

Further, as shown in FIG. 6, a gourd in which a tension bolt (12) is engaged with a fixing plate (10) provided at one end (the left end in FIG. 2) of the mold (K). -Shaped engaging hole (10a)
Are provided at the same position as the main bar (20) and in the same number. As a result, the tension bolt (12) is screwed into the bolt screw hole (4e) while leaving a certain length from the bolt head,
When the head of the tension bolt (12) is inserted through the large hole of the gourd-shaped engagement hole (10a) of the fixing plate (10) and the rebar cage (B) is slightly rotated and pulled, the tension bolt (12) 1
The head of (2) engages with the gourd-shaped engagement hole (10a), that is, the fixing plate (10).

The other end of the main bar (20) of the rebar cage (B) is engaged by the following structure. (11) is a tension plate having the same diameter as the inner diameter of the form (K). As shown in FIG. 7, the gourd-shaped engagement hole (11a) similar to the fixing plate (10) is the same as the main bar (20). The same number are provided at the positions, and the tension rod (1
A fastening screw hole (11b) for fastening 3) is provided.

The end fitting (4) is engaged with the main bar (20) and the tension bolt (12) in the same manner as in the above case. Further, a tension bolt (12) and a tension plate (11) screwed to the end (4).
The engagement between the fixing plate (10) and the tension bolt (12) is the same as the engagement between the fixing plate (10) and the tension bolt (12).

Further, one end of the tension rod (13) is screwed into the fastening screw hole (11b) of the tension plate (11), and the other end of the tension rod (13) has the other of the mold diameter (K). Fixing plate (1
0) is projected to the outside of the mold (K) through the rod hole (16).

(14) is a locking nut screw-set on the tension rod (13), and after tightening the rebar cage (B) with an appropriate tensioning device via the rod, tighten the locking nut (14),
Reinforcing bar (B) and tension rod (13) are locked to form (K) in tension.

Although set as described above, particularly when manufacturing a node pile (F) having both ends of the pile as node portions (2) as shown in FIG. 1,
The procedure is as follows.

As described above, first, at the end portions of the rebar cage (B) or at one end portion, the knot portion forming portion (33) whose outer diameter is the end portion of the frame is formed.
An end fitting (4) having a diameter substantially equal to the inner diameter is attached so that the heading portion (21) of the main bar (20) is locked in the tapered hole (4d) of the end plate (4a). A tension bolt (12) is screwed into the screw hole (4e) of the end plate (4a) for the bolt, leaving a certain length from the head.

In the rebar cage (B) in the above state, the cylindrical side plates (4b) of the end fittings (4) are inclined side surfaces in the node forming portion (33) of the lower formwork (34) end formwork. Fit it so that it is located on the outer peripheral portion excluding the portion, and install it in the lower mold (34).

In this case, the heads of the tension bolts (12) attached to the end fittings (4) are the large holes of the gourd-shaped engagement holes (10a) (11a) of the fixing plate (10) and the tension plate (11). Install so that it is located at.

Next, move the rebar cage (B) toward the fixing plate (10) at the left end in the figure, and insert the head of the tension bolt (12) into the large hole of the gourd-shaped engagement hole (10a). Then, the head of the tension bolt (12) is made to project to the outside from the fixing plate (10).

In this state, the tension plate (11) on the right side of the rebar cage (B) is moved to the left, and the head of the tension bolt (12) is passed through the gourd-shaped engagement hole (11a) to the right side of the drawing from the tension plate (11). To project.

Next, the rebar cage (B) is slightly rotated so that the heading portion (21) of the main bar (20) is located in the small hole portion of the gourd-shaped engaging holes (10a) (11a), and the rebar cage (B) is ) And the tension rod (13) to the right, the main bar (2
The left and right heading portions (21) of (0) are locked in the small holes of the gourd-shaped engagement holes (10a) (11a) of the fixed plate (10) and the tension plate (11).

As described above, when the setting of the end fitting (4), the rebar cage (B) and the lower mold (34) is completed, the lower mold (34) is then set.
A predetermined amount of fresh concrete is filled therein, and the upper formwork (35) is covered and closed as shown in FIG. 13, and then the upper formwork (35) and the lower formwork (34) are fastened at the flange portion. At this time, the end fitting (4) is fitted and set such that the cylindrical side plate (4b) is located on the outer peripheral portion of the knot portion molding portion (33) of the mold (K) excluding the inclined side surface portion. Because
The movement in the axial direction beyond a certain range is restricted, and the end fitting (4) is held at a predetermined position without being tilted or displaced.

In this way, the tension rod (13) is pulled from the outside of the mold (K) in the axial direction, that is, in the right direction of the drawing, to rebar cage (B).
Get nervous. In this case, since the left end heading portion (21) of the main bar (20) of the reinforcing bar cage (B) inside the formwork is locked to the fixing plate (10), the main bar (20) extends and the reinforcing bar cage (20) when pulled. B) is given a tension force, and in this state, the locking nut (14) screw-engaged with the tension rod (13) is tightened to lock the right fixing plate (10) at the end of the form (K). To do.

When the tension is increased as described above, the end metal fitting (4) on the tension plate (11) side is locked to the heading portion (21) of the main reinforcement (20), so that the main reinforcement (20) extends rightward. Moving.
Therefore, the molding part (3) for setting the end fitting (4)
As shown in FIG. 2, 3) is formed in a length that allows for the amount of movement.

Further, at this time, even if the end fitting (4) moves in the axial direction of the pile as the main bar (20) extends, the end fitting (4) fitted into the joint forming part (33) is It comes into contact with the side surface of the knot-forming portion (33) and is restrained from moving further and held at a predetermined position.

The mold (K) in the above state is placed on the rotary roller (41) of the centrifugal molding device shown in FIG. 13, and the mold (K) is subjected to high-speed rotation and centrifugal molding as in the conventional case. , And then steam curing.

Then, the mold release after hardening by steam curing is to loosen the tension of the tension rod (13), that is, the tension rod (13).
Tension bolts (12) engaged with pile end fittings (4) by loosening the locking nuts (14) fastened to Remove and remove the mold. This gives a knot (3) at the end.
(3) is provided, and the node pile (F) as shown in FIG. 1 or FIG. 16 in which the end fittings (4) and (4) are attached to the nodes (3) and (3) can be manufactured.

FIG. 3 shows an example of manufacturing a node pile (F) in which only one end of the pile is a node (3). In this case, the end of the rebar cage (B) on the pile end side that is not the node. An end fitting (40) corresponding to this is attached to the part by the same means as above, and is installed in the form (K) and is engaged and connected to the fixing plate (10) by a tension bolt (12). Set, and the reinforcing cage (B) is tensioned in the same manner as above, and centrifugal molding is performed. by this,
It is possible to manufacture the node pile (F) shown in FIG. 14 which has the node portion (3) only at one end and which has the end fitting (4) attached to the node portion (3).

Further, FIG. 5 shows that in the above-mentioned embodiment, the diameter of the knotted portion (33) at the end of the mold (K) into which the end fitting (4) is fitted is set to the diameter of the intermediate knotted portion (32). An example is shown in which the diameter is larger than the diameter, and in this case as well, the engagement of the main bar (20) of the rebar cage (B) with the end fitting (4) and the fixing plate (10) is as described above. The same is done as. As a result, as shown in FIG. 17, it is possible to manufacture a node pile (F) in which the diameter of the node portion (3) at the pile end portion is larger than that of the intermediate node portion (2). Supporting power is further improved.

FIG. 8 shows an embodiment in which the end portion of the main bar (20) of the reinforcing bar cage (B) is threaded and positioned slightly inward of the end fitting.

In the case of this embodiment, as shown in an enlarged view in FIGS. 10 and 11, the main bar (20) of the reinforcing bar basket (B) is cut into a certain length, and each end is threaded to form a hoop. Muscle (2
4) etc. are knitted in a cage, and a nut with a seat (23) is screwed and set so that the threaded portion of the end projects into the threaded portion (22). The end fitting (4) used for this is the end plate (4a) as in the above embodiment.
And the side plate (4b), the end plate (4a) is provided with the same number of insertion holes (4f) at positions corresponding to the main bars (20).

Then, the protruding threaded portion (22) is an end plate (4a) of the node forming portion (33) into which the end fitting (4) is fitted.
A tension bolt (17) with an inner screw is positioned slightly inward so as to face the insertion hole (4f), and a tension bolt (17) with an internal thread is screwed into the end of the threaded portion (22) and set.

As the fixing plate (10) and the tension plate (11), the same ones as those in the above-mentioned embodiment are used, and the engagement of the tension bolt (17) with the internal screw to the fixing plate (10) and the tension plate (11). The method is carried out as in the heading process.

Hereafter, the process of filling fresh concrete into the form (K) and applying tension to the main bar (20) is the same as the above, but in the case of screwing, the end fitting (4) and the main bar (20) are The main bars (20) when tensioned as they are not locked to the ends
Only extends. Therefore, the length of the tension bolt (17) with an inner screw on the tension plate (11) side must be set to a length that allows for the amount of extension, as shown in the figure. In this tension,
Even if the main bar (20) or the tension bolt (17) with an internal thread comes into contact with the end fitting (4), the end fitting (4) is fitted inside the knot forming part (33). Therefore, it is held at a predetermined position without causing tilting or displacement.

Therefore, by performing centrifugal molding in the same manner as described above, the end portion has the node portion (2) and the end portion fitting (4).
Thus, the node pile (F) as shown in FIG. In this case, the tension force introduced into the pile is prevented from loosening by fixing it to the concrete with a nut with seat (23) screwed to the end of the main bar (20).

Further, as shown in FIG. 8, an arbitrary position of the form (K),
For example, two end metal fittings (4) and (4) are fitted into the central node molding portion (32) with a slight gap, and after the concrete is cured and hardened, between the end metal fittings (4) and (4). By cutting the main bar, two or more node piles (F) in which one end (3) of the pile ends and the end fittings (4) are capped with one formwork (K) are simple and economical. Can be manufactured in a simple manner. Although not shown, one of the knot-forming parts (32) located inward of the end of the mold (K) should be
If the individual end fittings (4) are fitted and set in the same manner as above, the knot pile (F) shorter than the form (K) can be used without using the entire form length.
Can be manufactured.

FIG. 9 shows a manufacturing method of the end fitting (9) of the joint (3) having a shape corresponding to the side surface shape of the joint forming portion (33). As shown in FIG. F) is obtained. In this case as well, the engagement means can be implemented in the same manner as described above, but in particular, the end metal fitting (4) fitted and set in the node molding portion (33) will not be displaced, etc. it can.

In each of the above-described embodiments, the knot portion molding portion (33) at the end of the mold has a shape as shown in FIG. 8 as compared with the case where the inner diameter of the mold end is made to be the nodal diameter as shown in FIG. 2 or 11. Alternatively, as shown in FIG. 9, if the diameter of the body (1 ') is made the same, the stability of the end fitting (4) will be improved.

Further, in each of the above-mentioned embodiments, the tension bolt (12) or the tension bolt (17) with an internal screw is locked to the fixing plate (10) of the form (K), as shown in FIG. Then, when the heading portion (21) of the main bar (20) is locked to the end fitting (4) and is set in the knot forming part (33), the end fitting (4) is set to the knot (33). ) And does not move in the axial direction, it can be a reaction force of tension.

The node piles (F) manufactured as described above are filled with gravel, crushed stone, etc. around the piles as friction piles as shown in Fig. 14, or a plurality of node piles (F) as shown in Fig. 15. ) Is used as a foundation pile, and in this case, since there is a node at the end, a large supporting force can be expected at the tip of the pile as a friction pile, and the end fittings at the end of the node pile are also available. By welding the two together, the connecting portion has a large cross-sectional area, the bending strength is improved, and a safe and strong foundation pile can be obtained.

[Effects of the Invention] According to the above-described manufacturing method of the present invention, since the end fitting is set by being fitted into the knot forming portion of the form, tension is applied to the rebar cage when the form is closed or when fresh concrete is filled. The end fittings are not tilted or misaligned in the case of giving a pressure or during rotational centrifugal molding, and the end fittings are securely held at a predetermined position.

Therefore, for example, by using a mold having a knot shaped part on at least one end, and fitting and setting an end fitting to the knot formed part of this end, the axial intermediate part and at least one part are produced. Easily and reliably a concrete concrete concrete pile with the above-mentioned effect, which has joints at multiple places including the pile end and the end fittings are accurately attached to the joints of at least one pile end without tilting. Can be manufactured, and its dimensional accuracy is improved.

Moreover, the concrete joint with PC joints manufactured in this way has a large pile tip support force even when it is used as a friction pile because of the presence of joints at least at one end as well as in the axial middle portion. Become. Also, by welding and connecting the concrete pegs with PC joints with the end fittings at the joints at the pile ends, the joint cross-sectional area is increased and the bending resistance against horizontal force is improved accordingly. Therefore, it is possible to construct a foundation pile that is safer and stronger than before.

It is also possible to set the two end fittings by fitting them back-to-back at a slight interval in the node forming part in the intermediate position, and in this case, after the pile manufacturing, between the two end fittings By cutting the main bar, it is possible to easily and economically manufacture two or more piles whose end portions are node portions with one formwork. It can also be manufactured by fitting one end fitting into one of the knot forming parts located inward from the end of the form, and in this case, the PC knot shorter than the form without using the entire length of the form. It is possible to manufacture attached concrete piles.

Furthermore, by using a form that the diameter of the knotted part where the end fittings are fitted and set is made larger than that of the other knotted part, the knot end of the pile end is expanded more than the middle knot. We can manufacture concrete piles with PC joints,
By using this pile, the tip supporting force of the foundation pile and the connection strength between the piles are further improved.

[Brief description of drawings]

Fig. 1 is a side view of a concrete section with concrete joints with end brackets attached to the joints on the ends of both piles. Fig. 2 shows an example of the method for manufacturing the concrete pile with joints in the previous figure. The plan view and FIG. 3 are partially cutaway plan views showing a method for manufacturing a concrete pile with a PC node having only one end as a node, and FIGS. 4 (a) and 4 (b).
Is a front view and a cross-sectional view showing the end fitting in the case of manufacturing by the above method. In FIG. 5, the diameter of the end joint is larger than that of the intermediate joint.
Partial plan view showing the method of manufacturing PC knotted concrete pile, Fig. 6 is a front view of a fixing plate, Fig. 7 is a front view of a tension plate, and Fig. 8 is a PC when the ends of the main bars are threaded. FIG. 9 is a plan view showing an embodiment of a method for manufacturing a knotted concrete pile, FIG. 9 is a partial plan view showing another embodiment, and FIG. 10 is a front view showing an end fitting used in the above embodiment. Sectional view, Fig. 11 is an enlarged sectional view of a part of the case where the end of the main bar is threaded, Fig. 12
The figure is a partial plan view showing still another embodiment, FIG. 13 is a front view showing the entire centrifugal molding apparatus, and FIGS. 14 and 15 show a node pile having a node portion at one end. Sectional views showing the foundation pile structure, Figures 16 to 18 are front views showing joint piles with different end joints, and Figures 19 and 20 are foundation piles using conventional joint piles. It is sectional drawing which shows a structure. [Explanation of symbols] (1) …… Body (2) …… Knots (3) …… Knots (4) …… End fittings (4a) …… End plates (4b) …… Side plates (4c) ...... Gourd-like fastening hole (4d) …… Tapered hole (4e) …… Screw hole (4f) …… Insertion hole (10) …… Fixing plate (10a) …… Gourd-like engagement hole (11) …… Tension Plate (11a) …… Gourd-like engagement hole (11b) …… Tightening screw hole (12) …… Tension bolt (13) …… Tension rod (14) …… Locking nut (15) …… Centrifugal tire (16) ) …… Rod hole (17) …… Tension bolt with internal screw (20) …… Main bar (21) …… Heading part (22) …… Screwed part (23) …… Seat nut (24) …… Hoof Muscle (31) …… Body part molding part (32) …… Middle node part molding part (33) …… End node part molding part (34) …… Lower formwork (35) …… Upper formwork ( B) …… Reinforcing bar cage (F) …… Co with PC section Cleat pile (Fushikui) (K) ...... formwork

Claims (7)

(57) [Claims] 1. A mold which is openable and closable and is provided with a plurality of node molding portions at a plurality of axial positions at predetermined intervals in the axial direction of the mold, and is located at the end of a knotted pile to be manufactured. In the nodal part molding part of the mold, a cap-shaped nodal end fitting made of an end plate having substantially the same diameter as the inner diameter of the nodal part molding part of the formwork and a cylindrical side plate extending from its peripheral edge, Insert the cylindrical side plate so that it is located on the outer peripheral part of the mold, except for the inclined side part, in the node forming part, and set the rebar cage in the cylindrical form, then A method for manufacturing a concrete pile with a PC knot, in which the concrete is filled into the frame and a tension is applied to the main reinforcement of the reinforced cage to manufacture the pile by rotational centrifugal molding. 2. A main bar constituting a rebar cage set in a form is locked in a locking hole provided in an end plate of an end fitting fitted and set in a molded part of a knot, and a tension force is applied to the main bar. The method for producing a concrete pile with a PC node according to claim 1, wherein the concrete pile is produced by applying the method. 3. The end of the main bar constituting the rebar cage set in the mold is located slightly inward of the side plate extending side from the end plate of the end fitting fitted and set in the knot molding part, The method for manufacturing a concrete-pile-equipped concrete pile according to claim 1, wherein the pile is manufactured by applying tension to the main bars. 4. The PC joint according to any one of claims 1 to 3, wherein the joint forming portion into which the end fitting is fitted and set is a joint forming portion provided on at least one end of the mold. Manufacturing method for concrete piles. 5. A joint forming portion into which an end fitting is fitted and set is one of joint forming portions at an intermediate portion in the axial direction of the mold, and one or two end fittings are formed in the joint forming portion. The method for producing a concrete-clad concrete pile with a PC joint according to claim 1, wherein the concrete pile is fitted and set. 6. A plurality of node molding portions are provided at predetermined intervals in an axially intermediate portion of an openable / closable cylindrical frame, and
A mold for manufacturing a concrete pile with a PC knot, characterized in that at least one of the mold ends is also provided with a knot forming part. 7. The production of a PC knot-concrete concrete pile according to claim 6, wherein the diameter of the node molding portion at the end of the pile into which the end fitting is fitted is made larger than that of the other node molding portion. Formwork.