JP2676126B2 - Equipment for manufacturing PC concrete pillars, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, on <br/> made ZoSo location of the PC concrete pillar body, such as that gave the pre-stress to the pillar and the tubular body such as a PC pile.

[0002]

2. Description of the Related Art Generally, when manufacturing a cylindrical PC pile, a PC concrete pillar such as a PC pole, or a pipe, it is carried out as follows.

As shown in FIG. 24, a core rebar cage (101) is set in a semicircular lower formwork (Wb) of a formwork (W) which is divided into upper and lower parts, and a predetermined amount of raw material is used. It is filled with concrete, covered with an upper frame (Wa), fitted with flanges (Wa1) (Wb1), and fastened with, for example, fasteners such as bolts and nuts, and sealed. As a means for fastening the form, as shown in FIGS. 14 to 17, there is also a case where a hooked fastening rod (80) is provided on the divided flanges (Wa1) (Wb1).

In any case, after the formwork is fastened, the tension rod (50) connected in advance to the end of the rebar cage (101).
Is tightened in the axial direction from the outside of the form (W) to give a tension to the internal rebar cage (101), that is, the tension nut (51) at the end of the tension rod (50) is tightened in the tensioned state. Then, the mold (W) is placed on the centrifugal molding apparatus while being locked to the fixing plate (100) at the end of the mold, and is subjected to high speed rotation for centrifugal molding. (Wc) is a centrifugal tire.

After steam curing, a concrete pillar is taken out from the mold, and concrete piles and poles are manufactured in this way. The pre-stress is given to the pillar or the like by the force of the rebar cage (101) to contract when the tension is relaxed.

The tension rod (50) and the rebar cage (101) are connected as follows.

The main bar (101) that constitutes the rebar cage (101)
a) is cut to a certain length and each end (101
The c) is hedging-processed and is knitted in a basket shape with the hoop muscles (101b). The end fittings (104) of concrete pillars such as piles are engaged with both ends of the main bar (101a).

As shown in FIG. 26, the end fitting (104) has a cap shape formed by an end plate and a tubular side plate, and the end plate (104a) has two large and small holes connected to each other. -Shaped fastening hole (104b) is
The same number is provided at the same position as a).

The small hole portion of the fastening hole (104b) is formed in a tapered shape so that the hedging end portion (101c) of the main bar (101a) is locked, and the large hole portion is strained. The bolt (102) is screwed with a certain length left from the head of the bolt.

At one end of the rebar cage (101), the tension bolt (102) is inserted into the gourd-shaped engagement hole (103a) of the engagement plate (103) shown in FIG. 25 to which the tension rod (50) is connected. ) Is inserted and engaged, the rebar cage (101) and the tension rod (50) are connected. At the other end, it is similarly engaged with the fixing plate (100) (FIG. 24).

When a tension force is applied to the rebar cage (101) inside the formwork connected as described above, the tension rod (50) is used.
At the end of the, hydraulic cylinder (not shown) as a tensioning device
The piston rod is connected, the hydraulic cylinder is operated to contract the piston rod and pull the rebar cage (101), and if a predetermined tension force is reached, a tension nut (usually a hexagonal square nut) (51) Is tightened and locked to the fixing plate (100) to give tension.

[0012]

However, in the manufacture of the above-mentioned concreel column, there are the following problems in the work and process of applying tension to the rebar cage (101).

That is, in the above-mentioned tensioning process, it is judged whether or not a predetermined tension force is applied by simply using a pressure gauge provided in a hydraulic circuit for operating the hydraulic cylinder of the tensioning device to change the pressure. Since it is a method of performing visual observation, a part of the tensile force is absorbed by the friction between the rebar cage (101) or the end fitting (104) and the inner wall of the form (W) in the form (W), There was a possibility that a predetermined tension could not be applied to the rebar cage.

Further, due to uneven cutting lengths of the main bars (101a), unevenness due to hedging, and variations in screwing lengths of the tension bolts (102), a plurality of main bars (101a) constituting a rebar cage. ) Was not loaded with equal tension, and there was a drawback that some of the main bars were stretched or yielded more than the yield value.

As the tensioning device and the tensioning work by the tensioning device, the work of pulling the tension rod, and the work of pulling the hooked fastening rod arranged along the split flange for fastening the formwork itself are hydraulic. Although it is done by operating the cylinder, tension with the tension rod or fastening rod
Most of the other work of binding operations such as the device is performed manually
And the work is not only dangerous,
It has the drawback of requiring time and effort.

[0016] Thus, measuring the axial displacement due to tensile and given El tension, by determining, PC concrete pole gave equalizing one good rebar tension to the main reinforcement of the concrete pillar to be produced and the internal reinforcing bar cage Those who can efficiently manufacture the body
Although the method was developed, the equipment used for this
Automate the straining work that causes the problems described above.
It is impossible to improve the manufacturing efficiency.

In the present invention, all the engaging and pulling work of the tension rod or the fastening rod and the tension device is automatically performed, and the work of engaging the mold by tightening the nut in the tension state and the tension state is performed. to playable as automatically, also the implementation of the method
The present invention provides a manufacturing apparatus that can be suitably used.

[0018]

Means for Solving the Problems and Its Action The present invention is an apparatus for producing a PC concrete column by applying an axial tension force to a rebar cage inside a sealed formwork , and its characteristic features are as follows: , As a tension device for the rebar cage, with a flange provided on the outer end of the form of the tension rod connected to the inner rebar cage
Engages with the engaging member away from the axis at right angles.
And tensioning means for pulling the tension rods to the mold axis chuck unit for desorption in engagement, in accordance with the displacement due to said tensile measured by displacement meter provided on said tensioning means, threaded tension rod It is provided with nut tightening means for automatically rotating and tightening the combined tension nut by an external driving force.

[0019] According to the manufacturing apparatus, tension means to this
Since the chuck is, the axis to the flanged engaging member provided at the end of the tension rod which is connected to the internal reinforcing bar cage engages closely with movement from <br/> perpendicular direction having a high It does not require precision and can be locked more reliably than by screwing. Then, when the tension rod pulls the tension rod in this state, the displacement due to the tension action is measured by the displacement gauge provided in the tension device, and the nut tightening device operates according to the measured displacement to screw the tension rod. The combined tension nut is rotated by an external driving force to be fastened. Therefore, the tension nut is automatically screwed in according to the tension displacement action of the tension rod, and is tightened without difficulty. Further, this keeps the reinforcing bar cage in a predetermined tension state.

Further, in the invention as set forth in claim 2 , in the above-mentioned manufacturing apparatus, as a fastening device of a mold which is divided into upper and lower semi-circular halves, a hooked fastening rod for hermetically fastening the upper and lower molds is divided on both sides. A fastening means that extends on the flange and locks on the end of the fastening rod projecting from the end of the formwork and pulls it in the axial direction of the formwork, and a fastening nut screwed on the fastening rod to displace by the pulling. According to the above, a nut tightening means for automatically rotating and fastening by an external driving force is provided.

According to the apparatus of the present invention, the fastening rod is pulled by the fastening means locked to the ends of the hooked fastening rods arranged on both sides of the mold, and the fastening nut is actuated by the operation of the nut fastening means. By rotating and fastening, the upper and lower molds can be reliably and automatically fastened in a sealed state. Further, this makes it possible to favorably perform the tensioning work of the reinforcing bar cage by the tensioning device without any trouble.

Further, as the nut tightening means for rotating and tightening the tension nut or the tightening nut composed of a square nut such as a hexagon in the above-mentioned manufacturing apparatus, a roller with a claw rotated by a rotary drive device is provided, It is preferable that the nut is rotated by pressing the roller against the outer peripheral surface of the nut and rotating the roller.

In other words, the claw roller rotated by the rotation driving device provided in the nut tightening means is pressed against the outer peripheral surface of the tension nut or the fastening nut from one side to rotate, whereby the claw roller is rotated. Is transmitted directly to the nut. As a result, the tension nut or the fastening nut can be rotated and fastened satisfactorily and reliably, and its automation can be achieved. Also, since the roller with a claw is pressed against the outer peripheral surface of the nut to rotate the nut, even if the size (diameter, etc.) of the nut or its outer shape changes slightly, or the screwing position changes, as described above It can be concluded without problems.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

A mold (W) for centrifugal molding, a rebar cage (101) set inside the frame, and main bars (101)
a), each structure of the end fittings (104) and the like, their connecting structure, the connecting structure of the tension rod (50) and the like are as described in the above description of the prior art. Omit it.

[0026] However, the mold outside the frame end portion of the tension rod (50), separately from the tensioning nut (51), flag the tensioning device
Flange nut as Nji with engagement member (52) is provided
Et al are.

Further, the split flange (Wa1) of the upper and lower molds (Wa) (Wb) in which the rebar cage (101) is housed and closed.
On (Wb1), as a fastener for hermetically fastening, FIG.
And a hooked fastening rod (80) as shown in FIG.
Are arranged so as to extend in the axial direction along the dividing flange, and both ends thereof are penetrated by the fixing plates (100) arranged at both ends of the formwork. In the case of the figure, the rod ends are fitted in the notches formed on both sides of the fixing plate (100).

As shown in FIGS. 16 and 17, the fastening rod (80) is provided with a hook member (105) having locking hooks (105a) at required intervals in the longitudinal direction of the fastening rod (80). It is fitted and fixed in place by a position adjusting nut (107) screwed onto the outer peripheral thread of the fastening rod (80). On the other hand, the upper and lower molds (Wa) (Wb)
The split flanges (Wa1) (Wb1) are provided with engaging holes (108) into which the locking hooks (105a) can be fitted and engaged at required intervals in the longitudinal direction, and the hook members (105) A fixing roller (106) is disposed on the upper and lower surfaces of the flange to which the locking hook (105a) locks, and the fixing plate (100) is pulled in a state in which the fastening rod (80) is pulled in the arrow direction of FIG. By tightening the fastening nut (81) screwed to the more projecting end, the upper and lower molds (Wa) at both split flanges (Wa1) (Wb1)
(Wb) can be fastened.

At the protruding end of this fastening rod (80),
Apart from the fastening nut (81), a flange nut (82) is engaged as a locking member for fastening means described later.

Next, the structure of the tension device (K) for the reinforcing cage in the manufacturing apparatus used in the present invention will be described with reference to FIGS.
A description will be given based on 3.

In FIGS. 1 to 3, (1) is a traveling platform that receives and supports the main part of the tensioning device (K), and is mounted on the base platform (6). Guide rails (7) are provided on both sides of the base frame (6), and traveling wheels (5) provided on both sides of the traveling platform (1) are fitted to the guide rails (7). It is provided so that it can run in the front-back direction. (4) is a mounting bracket (4) for the traveling wheel (5).

Guide rail (7) of the base frame (6)
The connecting rod (8) that is connected to the lower surface of the leg (6a) is loosely fitted to the upper plate of the leg (6a) and is elastically supported by the spring (9). It is possible to allow a slight amount of vertical and horizontal shake of the tension device (K) with respect to W).

Reference numeral (10) is a traveling cylinder arranged on the base frame (6) below the traveling table (1), and the end of the rod (10a) moving forward and backward is pin-connected to the traveling table (1). (11) and the traveling base (1) travels in the front-rear direction by the forward / backward movement of the rod (10a).

On the traveling table (1), four guide rods (2) are erected on the front, rear, left and right sides, and a fixing plate (3) is attached to the upper end of the rod (2). .

A box type main body elevating frame (20) is arranged above the traveling table (1), and guide bearings (2) attached to both side surfaces of the main body elevating frame (20).
1) is fitted to a guide rod (2) provided upright on the traveling table (1) and is provided so as to be able to move up and down.

Reference numeral (22) is an elevating cylinder mounted and fixed on the fixing plate (3), and the end of the vertically moving rod is connected to the upper surface of the main body elevating frame (20).
The body elevating frame (20) is moved up and down by the vertical movement of the rod. The lifting cylinder (22) includes a displacement sensor (2
2a) is provided so that the height of the main body elevating frame (20), that is, the height of the tensioning means (S) described later can be appropriately set.

As shown in FIGS. 4 to 6, the tensioning means (S) is constructed and mounted on the main body lifting frame (20) as follows.

As shown in FIG. 4, the body lifting frame (2
The tensioning cylinder (30) is mounted inside the (0) in the front-back direction with respect to the form (W). This tension cylinder (3
The piston rod (31) of 0) is a double rod and is provided so that when the tubular outer rod (31a) moves forward and backward by hydraulic pressure, the inner rod (31b) moves forward and backward.

(F) is a diaphragm type pressure gauge for measuring the pressure of air or oil for actuating the tensioning cylinder (30), and a pressure pump (Y) for feeding oil and the cylinder and the cylinder. In the present embodiment, the reinforcing rod cage (101) is pulled by the retracting side of the piston rod (31) that advances and retracts as will be described later. It is provided in the pipe line (y1) for feeding pressure. The pressure gauge (F) may be mounted on the pressure pump (Y).

The inner rod (31b) penetrates the outer rod (31a) and projects forward from the tensioning cylinder (30) and the body elevating frame (20). The tensioning rod ( A chuck portion (32) for a flange nut (52) attached to the outer end of the mold of (50) is provided.

The chuck portion (32) is engaged with the flange nut (52) by a descending action from above so that the chuck portion (32) can be tensioned so that it can be tensioned.
a) and the rear side connecting plate (32b) fixed to the piston rod (31) are connected to each other through the both side plates with a required space therebetween, and the locking plate (32a) and the locking plate (32a) are connected by a lowering action. The flange portion of the flange nut (52) is fitted and engaged with the connecting plate (32b) , and is disengaged by the ascending action.
It is provided to be separated. That is, the chuck part
(32) is the axial center of the flange nut (52)
Is approaching and disengaging from the right angle direction and engaging and disengaging.
I have. Thus, tension rod (5 by the piston rod (31) in the engaged state of performing backward action
0) will be pulled.

Reference numeral (33) is a displacement sensor such as a magnetic proximity switch for detecting the approach to the end face of the flange nut (52) when the chuck portion (32) is moved forward by the tensioning cylinder (30). 32) connecting plate (3)
2b), which is provided below the chuck part (3
2) is provided so that it can be positioned when advancing with respect to the end face of the flange nut (52).

Reference numeral (34) is a guide rod connected to the lower end of the connecting plate (32b) of the chuck part (32), which is slidable on the guide pipe (35) fixed to the elevating frame (20) of the main body. It is provided so as to prevent looseness of the chuck portion (32) due to the rod advancing and retracting action of the tensioning cylinder (30). Reference numeral (36) is a displacement sensor such as a limit switch for detecting the last retracted state of the rod of the tensioning cylinder (30).

The above displacement sensors (33) and (36)
Alternatively, the tensioning cylinder (30) may be provided with a displacement sensor (30a) for detecting the required retracted position of the piston rod (31).

Reference numeral (37) is a reaction box fixedly mounted on the front surface of the main body lifting frame (20) and covering the chuck part (32).
Due to the advancing action of (1), it comes into contact with the fixed plate (100) at the end of the form and receives the reaction force at the time of tension.

(H) is a winding type displacement gauge provided in the front part of the main body lifting frame (20), the wire (Ha) is connected to the chuck part (32), and the tensioning cylinder (30). The axial displacement (that is, the amount of extension of the main muscle) when the tension rod is pulled by is measured. As the displacement gauge, an encoder, an operating transformer type displacement gauge, or a cylinder with an encoder can be used in addition to the winding type displacement gauge as described above.

The nut tightening means (M1) for tightening the tension nut (51) while the tension rod (50) is pulled by the tension means (S) is constructed as follows.

In FIGS. 1, 2, 8 and 9, a holding cylinder (40) is vertically arranged on the front part of the traveling platform (1), and the rod is moved forward and backward in the vertical direction of the holding cylinder (40). A mounting board (48) is fixed to the upper end portion, and a mounting bracket (45) is erected on the mounting board (48). The mounting bracket (45) has a roller (42) with a claw pivotally supported on an upper part thereof, and a drive motor (41) mounted on a lower part thereof, and the output shaft of the drive motor (41) and the roller (42) with the claw. The chain (46) is hung on the sprockets (43a) (43b) provided on the shaft (4), and the drive motor (41) rotationally drives the claw roller (42).

The claw roller (42) is formed so that the claw portion (42a) on the outer periphery abuts on the corner of the outer periphery of the tension nut (51) by the rotation thereof to give rotation.
This tightens the tension nut (51). Considering the axial movement due to the tightening of the tension nut (51), the claw roller (42) is formed to be slightly longer in the axial direction. In the case of the figure, rollers with claws are provided on both front and rear sides of the transmission sprocket (43b). FIG. 13 shows the claw roller (42) on an enlarged scale.

Reference numeral (47) is a transmission type photoelectric switch composed of a light receiving portion and a light emitting portion which are arranged slightly above the claw roller (42), and the tension nut (51) is axially moved by tightening. It is provided so as to detect the contact with the fixed plate (100). The drive motor (4
1) is controlled to be rotationally driven according to the displacement due to the tension measured by the displacement meter (H).

The pressing cylinder (40) pushes up the piston rod at the time of fastening operation to push the roller with claws (42) into contact with the tension nut (51) so as to push it down, and after the fastening is completed, it descends. To do. (49a) (4
9b) is a guide rod and a guide pipe for guiding the vertical movement of the nut tightening means (M1).

Further, the fastening means (T) for fastening the hooked fastening rods (80) arranged on the divided flanges (Wa1) (Wb1) on both sides of the form (W) are constructed as follows. ing.

In FIGS. 4 and 10, reference numeral (60) is a fastening cylinder, which is arranged on both sides of the tensioning means (S) in the main body lifting frame (20), and the tip of the piston rod (61) thereof. Part, fastening rod (80)
A chuck portion (62) is provided which can be engaged with a flange nut (82) attached to the end of the.

This chuck part (62) has basically the same structure as the chuck part (32) in the above-mentioned tensioning means (S), and the front inverted U-shaped (FIG. 7) locking plate ( 6
2a) and the connecting plate (62b) at the rear part are connected by both side plates at a required interval. The lowering of the tic part (62) by the lowering action of the main body lifting frame (20) causes the locking plate. The flange portion of the flange nut (82) can be fitted and locked between (62a) and the connecting plate (62b). In this engaged state, the piston rod (61) retracts to pull the fastening rod (80).

Reference numeral (63) is a displacement sensor such as a magnetic proximity switch for detecting the approach of the chuck portion (62) to the end of the fastening rod (80). Reference numeral (64) is a guide rod connected to the side of the chuck portion (62), and is a guide pipe (6) fixed to the main body lifting frame (20).
It fits loosely in 5) so that the forward / backward movement can be performed without lateral vibration. Particularly, in the case of the drawing, a part of the side surface of the chuck part (62) is fitted in a guide groove (67) provided on the side surface of the reaction force box (37) so that the chuck part (62) can be moved forward and backward without displacement. There is.

Reference numeral (66) is a displacement sensor such as a limit switch, which is provided so as to detect the last retracted state of the fastening cylinder (60).

The above displacement sensors (63) and (66)
Instead of this, a displacement sensor (60a) for detecting the required retracted position of the piston rod (61) can be provided in the fastening cylinder (60).

The nut tightening means (M2) of the fastening means (T) has basically the same structure as the nut tightening means (M1) of the tensioning means (S), and is roughly structured as follows. ing.

11 and 12, the mounting brackets (7) fixed to both sides of the reaction box (37).
5) A holding cylinder (7) having a displacement sensor (70a)
0) is attached, and a mounting plate (78) is fixed and vertically installed at the lower end of the rod extending downward from the holding cylinder (70). A drive motor (71) is attached to the upper part of the attachment plate (78) and a claw roller (72) is attached to the lower part of the attachment plate (78) so that the drive motor (71) rotates to rotate the sprockets (73a) (73b) and the chain (76). It is transmitted to the claw roller (72) via the fastening nut (8).
1) is rotated in the tightening direction.

The claw roller (72) has the same structure as the claw roller (32) of the tensioning means (S). Further, the pressing cylinder (70) is configured to push the roller with a claw (72) into contact with the tension nut (81) by the pressing action thereof, and to raise after the fastening is completed. Reference numeral (77) is a transmissive photoelectric switch that detects that the fastening nut (81) has moved axially due to tightening and has come into contact with the fixed plate (100). (79a) (79
b) is a guide rod and a guide pipe.

The displacement sensor (30
As a) (40a) (60a) (70a), for example, a cylinder built-in sensor such as a pulse encoder or a proximity switch is used.

FIG. 18 shows a block diagram of the control relationship of the above-mentioned device of the present invention.

In the figure, the control device (90) issues an operation command for causing the tensioning device (K) to perform the tensioning action of the main muscle and the form fastening action, and the detection signals of the displacement sensors of the tensioning device (K). And each operation | movement of the tension | tensile_strength apparatus (K) is controlled based on the comparison determination result in a calculating device (91).

Further, the tension device (K) is the control device (9).
0), the tensioning operation and the fastening operation are performed, and the pressure at the time of tensioning, that is, the tensioning force P is measured by the pressure gauge (F) provided in the pipe line of the tensioning cylinder (30), and the displacement is performed. The axial displacement at the time of tension, that is, the extension amount D of the main muscle is measured by the gauge (H), and the measured value is transmitted to the arithmetic unit (91).

The arithmetic unit (91) consisting of a microcomputer is used for producing concrete columns or pipes to be manufactured, for example, the type of pile, pile diameter, pile length and / or number of main bars, main bar diameter, main bar length, etc. Input section (9
2), based on the input data of the input unit (92), a tension setting, a calculation setting unit (93) for calculating and setting upper and lower limit values of the amount of extension of the main muscle, and a tension transmitted from the tension device (K). The control device (90) includes a comparison / determination unit (94) for comparing and determining the measured values of the force and the amount of extension of the main muscle and the set value, and the determination result and the measurement completion signal of the comparison / determination unit (94). Send to and control.

The display / output unit (95) displays and outputs data such as tension, elongation, pile type, etc., and is equipped with a tension determination lamp.

The relationship between the tension and the amount of extension of the main muscle is as shown in FIG.

Where P0, PL, DH and D0, D
L and DH are the above-mentioned set values which are input to the computer in advance, and P0 is the slack in the frame of the rebar cage, the rebar cage and the cap-shaped end fitting, the tension plate, the fixing plate, the tension rod (5
0), the initial value of the tension force set in order to eliminate the measurement error due to the gap (play) caused by the connection of the tension device (K), and D0 is the extension amount of the main muscle at that time, that is, the displacement.

PL and DL are values set by the type of pile to be manufactured [different prestress amount (tension amount)], pile diameter, and pile length, and PL is required ( Give) The lower limit of tension that corresponds to the amount of prestress.
DL is the elongation amount (lower limit value) of the main bar (PC steel bar) calculated by the mathematical formula determined when the tension force PL is applied, and is PC
It depends on the length of the steel rod (pile length) and the diameter of the steel rod.

In addition, PH and DH should be set in consideration of the serration between the rebar cage and the inner surface of the mold, which are displaced in the axial direction of the mold, the material of the PC steel rod, relaxation, etc. in order to give a certain prestress. The value to be set is PH, which is a tension force increased by a few percent from PL, and is the upper limit value set within the range of allowable values for the tensile stress of the PC steel bar below the yield value. DH is the upper limit of the elongation of the PC steel rod calculated by a mathematical formula when the tension force PH is given, and similarly to the above, it depends on the length of the PC steel rod (pile length) and the diameter of the steel rod. different.

When the above settings are made, the area (A) in the figure is a normal range in which both the applied tension P and the measured main muscle stretch amount D are normal. The line (a1) shows that the tension of the main muscle was performed normally.

Further, regarding the tension of the line (a2) in the figure, only the tension is the upper limit value PH while the elongation of the main muscle does not reach the lower limit value DL.
It indicates that a part of the tensile force is broken by the rebar cage in the formwork, the end metal fittings and the inner wall of the formwork.

Therefore, if the tension ends in this state,
It is impossible to give a predetermined tension to the rebar cage and a defective pile with insufficient prestress is produced. To compensate for this, if the tension is further increased from the above state, the rebar cage and end fittings Will be damaged.

Furthermore, the tension of the line (a3) in FIG.
While the tension is less than the lower limit value PL, the elongation of the main bar reaches the upper limit value DH, the cutting length of the main bar is uneven (including the unevenness due to hedging process), and the variation of the screwing length of the tension bolt is uneven. For example, if an equal tension force is applied to a plurality of main bars, some of the main bars will be stretched or broken above the yield value or broken.

[0075] In no event the tension rebar cage using the apparatus of the present invention to eliminate the defect tension as tension of the tension or (a2) (a3), tension P also the main reinforcement of the row reliable tensions in the range of elongation amount D is also normal range (a) Nako
And This will be described below.

FIGS. 21, 22, and 23 are for manufacturing PC concrete pillars and the like by the above-described manufacturing apparatus of the present invention. More specifically, the upper and lower molds are fastened and the rebar cage is set in the mold. It shows the operation flow to strain.

In front of the tension device (K), the core rebar cage (101) is set inside, and the formwork (W) in which the hooked fastening rods (80) are arranged on the split flanges of the upper and lower formwork is the conveyor. It is supplied and arranged.

Step 1 First, the height of the tension device (K) is adjusted according to the size of the form (W). That is, according to the position of the tension rod (50), the lifting cylinder (22)
To adjust the height of the tensioning device (K).

Step 2, Step 3 Next, the tensioning device (K) is moved forward by the operation of the traveling cylinder (1). When the reaction force box (37) at the front of the tension device (K) comes into contact with the fixed plate (100) at the end of the formwork, the forward movement is stopped.

Step 4, Step 5 Subsequently, the piston rod (3) is driven by driving the tensioning cylinder (30).
The tensioning means (S) is moved forward by extending 1) and the flange sensor (5) is moved by the displacement sensor (33).
When the position where the end face of 2) is detected is reached, the forward action is stopped. As a result, the chuck portion (32) provided at the tip end portion of the piston rod (31) is attached to the flange nut (52).
Will be located above.

Step 6, Step 7 Then, the elevating cylinder (22) is operated to lower the elevating frame (20) of the main body of the tensioning device (K), and the chuck portion (32) is attached to the flange portion of the flange nut (52). Fit from above
Make engagement. At this time, the above-mentioned descent is detected by the displacement sensor (22
It is detected in a) and is stopped at the locking position.

Thereafter, the tensioning operation is performed, but in the case of the manufacturing apparatus of the illustrated embodiment, the formwork fastening (step 20) shown by the dotted line in the figure is performed until then, and the order of the formwork fastening operation shown in FIG. To do.

That is, the operation of the fastening cylinder (60) extends the piston rod (61) to advance the fastening means (T) (step 21). Then, the displacement sensor (63) is stopped at a predetermined position where the end surface of the flange nut (82) provided at the end of the hooked fastening rod (80) is detected, and the chuck portion (62) at the tip of the rod is stopped at the flange nut (82). Corresponding position above (step 2)
2).

Then, by lowering the tensioning device (K) (similar to step 23 and step 6), the chuck portion (62) is fitted and locked onto the flange portion of the flange nut (82) from above (step). 24).

Subsequently, the holding cylinder (70) is operated to push down the nut tightening means (M2) for the fastening nut, and the claw roller (72) provided at the lower part of the nut fastening means (M2) is moved to the end of the fastening rod (80). Fastening nuts (81)
It is pressed against the outer peripheral surface of. Also, this nut tightening means (M
The drop of 2) is detected by the displacement sensor (70a), and it is held in a pressed state in which rotation transmission is not hindered. The pressing force can be adjusted by the pressure of the pressing cylinder (60) (step 25).

In this way, the fastening cylinder (60) is operated, the piston rod (61) is retracted to pull in the chuck portion (62), and the fastening rod (80) is engaged via the flange nut (82) locked to this. Is pulled (step 26).

Then, in a predetermined tension state, the drive motor (71) is driven to rotate the roller with claws (72), and the fastening nut (81) in contact therewith is also rotated, so that the fastening nut (81) is rotated. Tighten and make contact with the fixing plate (100) at the end of the formwork. The photoelectric switch (77) detects the axial movement accompanying the tightening of the fastening nut (81), and stops the driving of the drive motor (71) at the position where the fastening nut (81) contacts the fixed plate (100). (Step 27).

As a result, the upper mold (Wa) and the lower mold (Wa)
b) is hermetically fastened with the hooked fastening rod (80) (step 28).

After the molds are fastened, the tensioning operation is performed in a state where the chuck portion (32) of the tensioning means (S) is locked to the flange nut (52) at the end of the tensioning rod (50).

Step 8 That is, the nut tightening means (M1) for the tension nut is pushed up by the operation of the pressing cylinder (40), and the roller with a claw (4
2) Press the side face of the tension nut (51). The rise of the nut tightening means (M1) is detected by the displacement sensor (40a), and is kept in a pressed state in which rotation transmission is not hindered. Further, this pressing force can be adjusted by the pressure of the pressing cylinder (40).

Step 9 In this way, the tension is started, the piston rod (31) of the tensioning cylinder (30) is retracted, and the chuck portion (32) is retracted, so that the flange nut (52) engaged therewith is drawn. The tension rod (50) is pulled through to apply tension to the rebar cage.

Step 10 When applying the tension force, the tension force is applied by the pressure gauge (F) provided on the tension cylinder (30) or the like according to the flow of tension, measurement and determination shown in FIG. 20 described later. The tension force and the axial displacement due to the tension measured by the displacement sensor (H), that is, the amount of extension of the main muscle are measured and transmitted to the arithmetic device (91) as described above, and the comparison determination unit (93). A predetermined tension force and a predetermined amount of tension are given while making a comparison and judgment with a set value determined by the pile type, the pile diameter, and the like.

Step 11 Then, in a state in which a predetermined amount of tension is applied, the drive motor (41) of the nut tightening means (M1) is driven, and the roller (42) with a claw circumscribing the tension nut (51). The tension nut (51) that is in contact with it by rotating the tension nut (5).
1) is tightened and brought into contact with the fixing plate (100) at the end of the mold. The photoelectric switch (47) detects the axial movement accompanying the tightening of the tension nut (51), and stops the drive motor (41) drive at the position where the tension nut (51) contacts the fixed plate (100). Let

Step 12 As a result, the tension rod (50) is engaged with the fixing plate (100) in the tensioned state, and a predetermined amount of tension is applied to the main bar of the rebar cage (101) inside the formwork. Will be held at.

Step 13 When the tension of the reinforcing bar cage (101) such as the main bars is completed in this way, the nut tightening means (M
1) is lowered by the operation of the presser cylinder (40) and disengaged from the tension nut (51). Further, the displacement sensor (40a) detects that it has descended to a predetermined position.

Step 14 This nut tightening means (M
After the lowering of 1), the lifting cylinder (22) is actuated to raise the lifting frame (20) of the main body of the tensioning device (K) to disengage the chuck part (32) from the flange nut (52), and then for traveling. The tensioning device (K) is retracted by the operation of the cylinder (10), and at the same time, the tensioning cylinder (30) of the tensioning means (S) is retracted.

At the same time as these actions, the mold fastening device is also fastened by the mold fastening shown in the dotted line in the figure (step 3).
23), as shown in FIG. 23, the nut tightening means (M2) is lifted by the operation of the holding cylinder (70) to be disengaged from the fastening nut (81), and the lift is detected by the displacement sensor (70a). Is detected (step 31) and then the main body elevating frame (20) of the tensioning device (K) is lifted to disengage the chuck part (62) from the flange nut (82) (steps 32 and 14). Similarly, the tightening cylinder (60) of the fastening means (T) is retracted as the tensioning device (K) is retracted (step 33).

These backward movements are caused by the displacement sensors (22a) (33) (36) and the displacement sensor (66), respectively.
Detect by.

As a result, each operation of fastening the form and tensioning the reinforcing cage is completed. After that, the form is moved to the next step, and the form before the tension is set anew, and the same as above. Is performed.

In the above embodiment, the case where the tensioning of the tensioning rod and the fastening of the form by pulling on the hooked fastening rod are performed at the same time has been described. However, the form fastening may be performed in a step different from the tensioning. Yes, in this case Figure 2
2 and the fastening action of FIG. 23 will be omitted.

Next, the method for tensioning the reinforcing cage will be described in detail below with reference to the flow chart of measurement and determination shown in FIG.

Step 1 The tensioning cylinder (30) is operated, and the tip chuck part (3) of the piston rod (31) is
2) to the end flange nut (5) of the tension rod (50).
The reinforcing bar cage (101) inside the mold connected to the tension rod (50), that is, the main bar (101a) is pulled.

Step 2 The tension P1 applied to the main muscle (101a) and the elongation amount D1 of the main muscle (101a) are measured by the pressure gauge (F) and the displacement gauge (H), respectively, and the measured values are shown in FIG. Is transmitted to the arithmetic unit (91).

Step 3 The sent measurement values P1 and D1 are compared with the initial set value P0 by the comparison / determination unit (94) to obtain P1.
Reaches P0, the displacement D0 at that time and the tension P
Set 0 to zero (reset the pressure gauge and displacement gauge) and perform the following measurements.

Step 4 Continue tensioning until the tension P2
, Measure the elongation amount D2 of the main muscle. The measured value is transmitted to the arithmetic unit (91). Step 5: If the sent tension force measurement value P2 reaches the tension force setting upper limit value PH (comparison by the comparison determination unit (94),
Judgment), Step 7 Stop tension.

Step 6 Further, even when the tension force P2 is not satisfied, the extension amount D2 of the main muscle is compared with the upper limit set value DH of the extension amount, and if D2 = DH, the process proceeds to step 7 to stop the tension. To do. If not satisfied, the above is repeated and the tension is stopped when either the tension force P2 or the extension amount D2 of the main muscle reaches the upper limit value.

Step 8 After the tension is stopped, the measured value P2,
D2 is displayed or printed out by the output section (95).

Step 9 Next, it is judged whether or not the measured values P2 and D2 are within the range of a predetermined set value. It is determined whether or not this is within the range of the normal range (A) shown in FIG. The tension force P2 is PL ≤P2
If ≤PH is not satisfied, it is judged that the tension is performed in the state as shown by the line (a3) in Fig. 19, and step 1
Moving to 3, the abnormal lamp is turned on. If it is satisfied, it is determined in step 10 whether the measured value D2 of the amount of elongation of the main muscle is within the normal range (A), and DL ≤
If D2 ≤ DH is not satisfied, it is judged that the tension is performed in the state as shown by line (a3) in FIG.
Moving to step 13, the abnormal lamp is turned on. If it is satisfied, the lamp indicating that the step 11 is normal is turned on, and the step 12 next step, that is, step 11 onward shown in FIG. Step 14 When the abnormal lamp is turned on, an abnormal process is performed such as inspection by an operator or releasing the tension of the reinforcing bar cage (101) to repair it.

In the above tension method , both the applied tension force P and the elongation amount D of the main muscles are intended to perform a reliable tension within the range of the normal range (A). It is intended to prevent manufacturing, breakage of main bars, breakage of rebar cages, etc. due to excessive tension.

[0110]

According to the manufacturing apparatus of the present invention as described above according to the present invention, a chuck portion having to this tensioning means, provided at an end of the tension rod which is connected to the internal reinforcing bar cage flange
To Tsukegakarigo member, approaching motion from a direction perpendicular to the axis
Since they can be engaged without the need to screw them in, the movement is simplified and automation is facilitated. Moreover, since the displacement of the tension rod due to the pulling action in this engaged state is measured and the tension nut is rotated by the external driving force to be fastened by the nut tightening means according to the displacement, the tension nut is the tension displacement of the tension rod. Depending on the action, it can be screwed and fastened automatically, so that the tension rod can be engaged and pulled automatically, and also the work of locking the mold in the tensioned state and the fastening state is automatically performed. be able to.

Further, according to the invention of claim 2 in which the fastening means is arranged on both sides of the tensioning device, the fastening action of the upper and lower molds can be automatically performed at the same time, and the tensioning work of the reinforcing bar cage by the tensioning device can be performed. It can be performed satisfactorily without any trouble.

Further, according to the invention of claim 3, the nut tightening means for tightening the tension nut or the tightening nut presses the roller with the claw rotated by the external driving force against the outer peripheral surface of the nut to transmit the rotation. The rotation of the claw roller can be directly transmitted to the nut, so that the tension nut or the fastening nut can be rotated and fastened satisfactorily and reliably, and its automation is facilitated. Further, even if the size (diameter, etc.) of the nut or its outer shape is slightly changed, the nut can be fastened as described above.

Therefore, the manufacturing apparatus of the present invention is
Measures and determines the axial displacement and tension of the cage and reinforcing cage.
However, depending on the pile type, pile diameter, pile length, and rebar structure, etc.
The amount of iron that is necessary and suitable for the reinforcement tension
It is suitable for the manufacturing method of PC concrete columns that give muscle tension.
Appropriately available and facilitates its implementation.

[Brief description of the drawings]

FIG. 1 is a front view of a manufacturing apparatus of the present invention.

FIG. 2 is a side view of the above manufacturing apparatus.

FIG. 3 is a vertical side view of a part of the same.

FIG. 4 is an enlarged cross-sectional view of a tensioning device portion shown by sectioning the tensioning cylinder and the fastening cylinder at a substantially axial center position.

FIG. 5 is a longitudinal sectional view of the tensioning device.

FIG. 6 is a front view of a chuck portion.

FIG. 7 is an enlarged front view of the tension device portion.

FIG. 8 is a vertical cross-sectional view of the nut tightening means of the tensioning device.

FIG. 9 is a front view of the same.

FIG. 10 is a vertical sectional side view of a fastening means portion.

FIG. 11 is a vertical cross-sectional view of a portion of a nut fastening means for fastening a mold.

FIG. 12 is a front view of the same.

FIG. 13 is an enlarged front view of the claw roller.

FIG. 14 is a plan view (A) of a mold provided with a hooked fastening rod and a front view (B) of the mold end on the tension side.

FIG. 15 is a side view of the above.

FIG. 16 is an enlarged cross-sectional view of a fastening portion of a hooked fastening rod by a locking member.

FIG. 17 is a vertical sectional side view of the same.

FIG. 18 is a block diagram showing a control relationship of the device of the present invention.

FIG. 19 is a diagram showing the relationship between tension and the amount of extension of the main muscle.

FIG. 20 is a flowchart showing a method for measuring and determining the tension and the amount of extension of the main muscle.

FIG. 21 is a flowchart showing a main muscle tensioning operation.

FIG. 22 is a flowchart showing a mold fastening operation.

FIG. 23 is a flowchart showing an operation of releasing the formwork fastening.

FIG. 24 is a partially cutaway plan view of a conventional mold for producing a concrete pillar.

FIG. 25 is a front view (A) and a side view (B) of the tension plate.

FIG. 26 is a front view (A) and a side view (B) of the end fitting.

[Explanation of symbols]

 (K) Tensioning device (1) Traveling base (6) Base mount (10) Traveling cylinder (20) Main body lifting frame (22) Lifting cylinder (22a) Displacement sensor (S) Tensioning means (30) Tensioning cylinder (30a) ) Displacement sensor (31) Piston rod (32) Chuck part (33) Displacement sensor (36) Displacement sensor (37) Reaction force box (39) Displacement sensor (F) Pressure gauge (M1) Nut tightening means (40) Presser cylinder (40a) Displacement sensor (41) Drive motor (42) Claw roller (47) Photoelectric switch (50) Tension rod (51) Tension nut (52) Flange nut (H) Displacement meter (T) Fastening means (60) Fastening Cylinder (60a) Displacement sensor (61) Piston rod (62) Chuck part (63) Displacement sensor (66) Displacement sensor (M2) Nut tightening means (70) Presser cylinder (70a) Displacement sensor (71) Drive motor (72) Claw roller (77) Photoelectric switch (80) Fastening rod (81) Fastening nut (82) Flange nut ( 90) Control device (91) Arithmetic device (92) Input part (93) Calculation setting part (94) Comparison determination part (95) Display and output part (W) Formwork (Wa) Upper formwork (Wb) Lower formwork (100) Fixing plate (101) Reinforcing bar basket (101a) Main bar (102) Tension bolt (103) Engaging plate (104) End fitting (105) Locking member (105a) Locking hook

Claims (3)

(57) [Claims] 1. A device for producing a PC concrete column by applying an axial tension force to a rebar cage inside a closed formwork, the model of a tension rod connected to an internal rebar cage as a rebar cage tensioning device. Engagement / disengagement with the flanged engaging member provided at the outer end of the frame by approaching and separating from the direction perpendicular to the axis
And tensioning means for pulling the tension rods to the mold axis chuck portion is engaged, in accordance with the displacement due to said tensile measured by displacement meter provided on said tension means, screwed into tension rod tension An apparatus for manufacturing a PC concrete pillar or the like, comprising nut tightening means for automatically rotating and tightening a nut by an external driving force. 2. A fastening device for a mold which is divided into upper and lower semicircles into two parts. A fastening rod with a hook for hermetically fastening the upper and lower molds is extended on the split flange, and the fastening rod is connected to the end of the mold. The fastening means of the form which is locked to the projecting end and pulled in the axial direction of the form and the fastening nut screwed to the fastening rod are automatically rotated and fastened by an external driving force according to the displacement caused by the pull. The apparatus for manufacturing a PC concrete pillar or the like according to claim 1 , further comprising nut tightening means. 3. A nut tightening means for rotating and tightening a tension nut or a tightening nut includes a roller with a claw rotated by a rotation driving means, and the roller with a claw is pressed against an outer peripheral surface of the nut to rotate the roller. The nut is rotated, and the apparatus for manufacturing a PC concrete pillar or the like according to claim 1 or 2 .