JPH0733673B2 - Control method for cylinder press-fitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a control of a press-fitting device for burying a cylindrical body, for example, a reinforced concrete cylindrical well (hereinafter simply referred to as a PC well) in the ground in a rigid direction. It is about the method.

(Prior art) Conventionally, this type of PC well was buried by digging a hard hole in the ground
The well is installed by hanging it in a solid hole with a crane. After the PC well is installed, it is the current situation that earth and sand are put in the hard holes to backfill.

(Problems to be Solved by the Invention) By the way, conventional burying of PC wells requires a considerable amount of labor and days for hard hole excavation and backfilling, and there is a place to temporarily accumulate excavated earth and sand. It was necessary, transportation of earth and sand was indispensable, and there were problems such as a large amount of cost and a lot of construction period.

The present invention has been made in view of the actual situation as described above,
The purpose is that the PC well can be buried using a jack without excavating a hard hole in the ground, and moreover, the press-fitting by the jack can be performed accurately and reliably, and the construction period can be shortened and the construction cost can be reduced. Another object of the present invention is to provide a control method of a cylindrical body press-fitting device that can be reduced.

(Means for Solving the Problem) In the present invention, in order to achieve the above object, the following technical means are taken.

That is, according to the method of the present invention, the plurality of jacks (9) standing upright on the outside of the cylinder (20) press-fitted into the ground pushes down the cylinder (20) via the pressure ring (16). In the press-fitting cylinder press-fitting device, the level of the pressure ring (16) is detected by a level sensor (22), and
The stroke of each jack (9) is detected by a stroke sensor, and the level and stroke signal (54) are detected.
Based on (51), each pump drive motor (29) is controlled so that a constant level can be maintained.

(Operation) According to the present invention, the stroke of each jack (9) when the cylinder is press-fitted is detected, and the inclination (level) of the pressure ring (16), that is, the cylinder (20) is detected by the level sensor (22). The stroke signal (54) and level signal (51) are input to the centralized control panel (21) to control the rotation speed of each pump drive motor (29) so that the level becomes constant. The discharge amount of the pump (28), that is, the supply flow rate is increased or decreased.
Therefore, the cylindrical body (20) is accurately press-fitted while maintaining the vertical state.

(Example) Hereinafter, the Example of this invention is described based on drawing.

In the drawing, (1) is a polygonal ring-shaped base, and sliding guides (2) are provided on the base (1) at intervals of 60 degrees with respect to the center of the ring in the radial direction. A moving cylinder (2) on which a sliding body (3) capable of supporting a reaction force is provided slidably in a radial direction, and the end of a piston rod (4) is connected to the outside of a sliding guide (2). 5) is provided in the sliding body (3). Then, on each sliding body (3), a jack mounting bracket (6) is fixed to the facing inner end, and a jack guide post (7) is provided outside each bracket (6). ), The hydraulic unit (8) is housed.

The jack mounting bracket (6) has an outer clevis (11) of the piston rod (10) of the jack (9).
Are connected by a pin (12) via a bush (not shown).

On the cylinder (9a) of each jack (9), engaging projections (13a) (13b) (trunnions) project downward from the middle of the head cover (9b) and project on the left and right sides parallel to the pin (12). It is provided, and the press-fitting stroke can be increased with one jack (9) by two-step operation. And
A substantially T-shaped guide (14) is provided at the position of the lower engaging projection (13b) on the surface of each cylinder (9a) facing the support (7), and the guide (14) is provided on the support (7). Guide rails (15)
The guide (14) is engaged with the cylinder (9a) so that each cylinder (9a) can be vertically moved up and down without falling.

(16) is a pressurizing ring, which is large enough to be inserted into each jack (9), and two pairs of engaging pieces (17) are provided outwardly corresponding to each jack (9). Each engagement piece (17) is formed with a notch (18) with which the projection (13a) (13b) is engaged. The ring (16) can be divided into three parts and is assembled by a connecting means such as a boil nut. Under the ring (16), a cylindrical body such as a PC well (20) is provided via a cover ring (19). ), And is optimally designed according to the diameter and thickness of the PC well (20).

Reference numeral (21) is a centralized control panel for centrally controlling the hydraulic unit (8) in each column (7). (22) is a level sensor of the pressure ring (16).

As shown in FIG. 4, the hydraulic circuit of the hydraulic unit (8) is configured to control each jack (9) and moving cylinder (5) by a centralized control panel (21). In the figure, (23a) and (23b) are main oil supply pipes, and (24)
Is the main oil drain pipe, (25a) and (25b) are oil feed and drain pipes to the moving cylinder (5), and (26) is the down side (press fit side) of the jack (9).
Oil supply and drain pipe, (27a) is the oil supply and drain pipe for jack high speed ascent, (2
7b) is an oil supply pipe for low speed jack rise, (28) is an oil pump,
(29) is a pump drive motor, (30) is an oil tank, (31)
(32) is an oil filter. Also, (33) (34)
(35) is a check valve, (36) (37) (38) is a pilot operated check valve, (39) (40) (41) (42) (43) is an electromagnetic switching valve, and (44) is a check valve. Flow rate adjustable throttle valve with valve, (45) (46)
(47) and (48) are relief valves, (49) is a digital pressure gauge,
(50) is a pressure gauge.

A case where the PC well (20) is press-fitted into the ground in the apparatus of the above embodiment will be described with reference to FIGS. 5 (1) to (10). First, the pump drive motor (29) is started to operate the oil pump (28), and the electromagnetic switching valve (39) connects the oil supply / exhaust pipe (25a) to the main oil supply / exhaust pipe (23a) to move each moving cylinder. Fill the inside of (5) with piston rod (4)
And slide the sliding body (3) backward to the opposite side,
The state shown in FIG. 9 is set, and then the solenoid operated directional control valve (39) is set to the oil supply / drainage stop state shown in FIG. 4, that is, the neutral state. Next, the PC wells (20a) (20b) are placed on the ground at predetermined positions, and the pressure ring (16) and the like are further placed. Therefore, the solenoid switching valve (40) is operated to connect the oil supply / exhaust pipe for high speed ascent (27a) and the main oil supply pipe (23a), and the cylinder (9a) of the jack (9) is rapidly ascended to the ascending limit. Set the solenoid switch valve (40) to the 4th position in the state of (10).
Return to the neutral state of the figure. At this time, the stroke signal (51) from the stroke sensor of each jack (9) is input to the centralized control panel (21), and the centralized control panel is used as a feedback signal of the inverter PG control signal (52) of the motor (29). It is input in (21).

Next, the electromagnetic switching valve (39) is operated to supply and drain the oil supply pipe (25b).
And the main oil supply pipe (23a) are connected to each other, pressure oil is supplied to the piston rod (4) side of each moving cylinder (5),
The jack (9) moves forward together with the support column (7), and the upper engaging protrusion (13a) is inserted into the notch (18) of the engaging piece (17) of the pressure linder (16), so that the sliding is possible at the forward limit. The moving body (3) stops. Subsequently, the electromagnetic switching valve (39) returns to the neutral position, and at the same time, the electromagnetic switching valve (41) operates to connect the main supply oil pipe (23b) to the descending side (press-fitting side) supply / exhaust oil pipe (26).
The state of FIG. 5 (1) is reached, and the cylinder (9a) continues to descend. At this time, the throttle control signal (51) from each stroke sensor, the press-fit pressure signal (53) from each digital pressure gauge (49) and the level signal (54) from each level sensor (22) are sent to the central control panel (21). Enter the pressure ring (1
The rotation speed of each pump drive motor (29) is controlled by the inverter PG control signal (52) so that the level of 6) becomes horizontal, and the PC well (20) is press-fitted in a vertical state.

Then, as shown in FIG. 5 (2), when the cylinder (9a) of the jack (9) reaches the stroke lower limit, the electromagnetic switching valve (4
1) is switched to the return side shown in Fig. 4, and at the same time, the solenoid valve (40) connects the low speed rising oil supply pipe (27b) and the main oil supply pipe (23a), and the cylinder (9a) is slightly lifted. As shown in FIG. 5 (3), when the engagement protrusion (13a) is located at the center of the notch (18) in the vertical direction, the electromagnetic switching valve (40) is again in the neutral state. Then, the solenoid switching valve (3
The main oil supply pipe (23a) and the oil supply / exhaust pipe (25b) are connected by 9), and the sliding body (3) retreats outward in the radial direction by the moving cylinder (5) to the state of Fig. 5 (4). Become.

The electromagnetic switching valve (39) returns to the neutral state again, and the electromagnetic switching valve (40) connects the main oil supply pipe (23a) and the oil supply / discharge oil pipe (27a), and the cylinder (9a) of the jack (9) is halfway. Up, and the lower engagement protrusion (13b) is located at the center of the notch (18) of the pressure ring (16), the stroke signal (51) is set by the stroke sensor and the solenoid switching valve is input. Fig. 5 (5) with (40) in the neutral position
The state becomes as shown in.

Next, the main supply oil pipe (23a) and the supply / exhaust oil pipe (25a) are connected by the electromagnetic switching valve (39), and the sliding body (3) advances toward the opposite inner side, as shown in FIG. 5 (6). To the jack (9)
The engaging projection (13b) of the engaging piece (17) of the pressure ring (16)
When the electromagnetic switching valve (39) is returned to the neutral position, the electromagnetic switching valve (41) connects the main oil supply pipe (23b) and the press-fitting side oil supply / exhaust pipe (26) to the jack (9). The cylinder (9a) descends, the PC well (20a) is completely pressed into the ground, and about half of the upper PC well (20b) remains, resulting in the state shown in FIG. 5 (7). Therefore, the solenoid switching valve (4
The main oil drain pipe (24) and the oil supply / drain pipe (26) are connected by 1), the main supply oil pipe (23a) and the low speed rising oil pipe (27b) are connected again by the electromagnetic switching valve (40), and the cylinder (9a )
Is slightly raised and the locking projection (13b) is located at the center of the notch (18) of the engaging piece (17) as shown in FIG. 5 (8), the electromagnetic switching valve (40) is in the neutral position. The main supply oil pipe (23a) and the oil supply / exhaust oil pipe (25b) are connected by the electromagnetic switching valve (39), and the sliding body (3) is retracted radially outward by the moving cylinder (5). The state shown in FIG. 9 is reached, and the solenoid operated directional control valve (39) returns to the neutral position.

By the above operation, press-fitting of one PC well (20) is completed.

Next, the pressure ring (16) and the cover ring (19) are lifted from above the PC well (20b) by a crane or other moving device to move laterally and temporarily wait, and then the PC well (20
Place the third PC well (20c) on top of b) and the cover ring (19) and force ring (16) on top of it to bring it to the state of FIG. 5 (10) and repeat the above operation. PC
Wells (20b) (20c) are pressed into the ground one after another.

According to the above-described embodiment, a cylinder press-fitting stroke that is approximately twice the stroke of the jack (9) can be ensured, and a substantially short stroke can be obtained by the jack with a large press-fitting stroke. That is, the entire device can be obtained at low cost. Further, the six jacks (9) and the moving cylinder (5) can be automatically controlled by the central control panel (21), and the level signal (54) of the level sensor (22) and the stroke sensor can be controlled. With the stroke signal (51) and the press-fitting pressure signal (53), the operation of the pump drive motor (29) is controlled, and the PC well (20) can be pressed into the ground accurately and reliably while maintaining the vertical state. it can.

The present invention is not limited to the above embodiment, and for example, the jack (9) may be a normal one, and the number thereof may be appropriately increased or decreased.

(Effects of the Invention) As described above, the present invention detects the level of the pressure ring (16) in the cylinder press-fitting device by the level sensor (22) and the stroke of each jack (9) by the stroke sensor. This is a method of controlling each pump drive motor (29) so that the pump drive motor (29) can be maintained at a constant level based on the level signal (54) and the stroke signal (51). With the verticality of the body (20) kept constant, the tubular body (20) can be accurately and reliably press-fitted into the ground, and the construction period and the construction cost can be reduced. Further, the device can be simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view,
2 is a partially cutaway enlarged side view, FIG. 3 is an enlarged view of part A of FIG. 1, FIG. 4 is a hydraulic circuit diagram, and FIGS. 5 (1) to (10) are tubular body press-fitting operation explanatory diagrams. is there. (9) …… Jack, (16) …… Pressure ring, (20)…
… Cylinder, (22) …… Level sensor, (29) …… Pump drive motor, (51) …… Stroke signal, (54) …… Level signal.

Claims (1)

[Claims] 1. A cylindrical body (20) press-fitted into the ground by a plurality of jacks (9) standing upright on the outside of the cylindrical body (20), which is pushed down through a pressure ring (16). In the cylindrical press-fitting device as described above, the level of the pressure ring (16) is detected by the level sensor (22), and the stroke of each jack (9) is detected by the stroke sensor. 54) A method for controlling a cylinder press-fitting device, characterized in that each pump drive motor (29) is controlled so as to maintain a constant level based on (51).