JP4430434B2 - Management method of mixed amount of continuous fiber in reinforced earth method using continuous fiber - Google Patents

Description

  The present invention is applicable to slope protection, retaining wall construction, and tree planting method, and the continuous fiber reinforced earth method sprayed on the construction site where a plurality of continuous fibers and sand should be reinforced is mixed. It relates to a quantity management method.

  The reinforced earth method using continuous fibers is applicable to slope protection, retaining wall construction, and tree planting methods. This is a construction method called Geofiber (registered trademark), which is an alternative to the construction method combined with the Machi block construction method.

  A reinforced earth method using continuous fibers will be described with reference to FIG. The sand supply device 8 is configured to supply sand, and the yarn supply device 1 is configured to supply continuous fibers.

  The yarn supply device 1 includes an ejector 7 that injects a yarn 2 fed from the supply device 1 from an injection nozzle 6 using high-pressure water sent from a water tank 3 via a high-pressure pump 4 through a supply pipe 5. This is combined with the sand supply device 8.

  On the other hand, the sand supply device 8 includes a measuring instrument 11 connected to the hopper 10 by a belt conveyor 9a, and a sprayer 12 connected to the measuring instrument 11 via a belt conveyor 9b. In the figure, reference numeral 13 denotes a tractor excavator for conveying sand from the sand pile 14, and 15 denotes a compressor for supplying compressed air to the sprayer 12. Reference numeral 16 denotes a generator serving as a power source for the measuring instrument 11 and the like, and 17 denotes a distribution board.

  The yarn supplying device 1 includes a portable bobbin case 21 having one guide stay 20 that feeds the yarn 2 from a plurality of (four in the illustrated example) spools 19 in an entangled manner, and includes a plurality of them. The stand (four in the illustrated example) was provided alone.

  In the ejector 7, the yarn 4 is inserted into the injection nozzle 6, and when pressurized water is discharged from the injection nozzle 6, the yarn 2 is also injected from the injection nozzle 6. On the other hand, the sand is conveyed to the ejection destination of the yarn 2 by the belt conveyors 9a and 9b and the supply pipe 5, and directly injected and mixed with the yarn 2.

Injection Such 0.15 to 0.3% of the sand used (dry weight) of about or sand 1 m ³ per the 2.75~4.5kg / m ³ of continuous fibers (multifilament non-twist) with jet water, and sand By mixing three-dimensionally, the shear strength can be increased and a more stable and strong earth structure can be constructed.

  In addition to road retaining walls and embankments, it is widely applicable to slope protection, embankment foundations on soft ground, earthquake and seismic foundations, protection of structures against impacts, dam filter layers, etc.

  In this continuous fiber reinforced earthwork, regarding the sand supply, the operator monitors the decrease in the sand in the tank of the sand conveyance device and replenishes the batch-measured sand, so the work is complicated and continuous supply is not easy. There is a problem. Sand is pumped through a supply pipe. This supply pipe is a flexible tube body, and the pumping of an excessive amount of sand has a longer life due to damage to the inner surface of the tube due to sand abrasion. There is also a risk of shortening.

  Further, regarding the supply of the yarn which is a continuous fiber, the yarn is supplied at a constant weight ratio with respect to the weight of the sand, but it is left to jet water jet, and it is not sufficiently managed. As a result, there is a case where an appropriate amount of yarn cannot be supplied to the injected sand, and there is a case where the strength of the construction site is insufficient because the sand and the yarn are not sufficiently intertwined.

  Therefore, the applicant previously proposed a method for managing the amount of continuous fibers mixed in the reinforced earth method using continuous fibers in the following patent document.

JP 2002-317444 A

  As shown in FIG. 13, this is provided with a fiber management device 18 which is a measuring device for measuring the amount of yarn fed out from the yarn supply device 1.

  The bobbin case 21 is a combination of a base and a support frame. The support frame is raised from the four corners of the base at the bottom of four frames whose upper part is curved in an arc shape, and the entire case is shaped like a birdcage. Form and cover with a cover.

  The load cell 34 is fixed to the bottom of the case with a lower pin, and a weighing stand comprising a cross-shaped bar is attached to the upper portion via the upper pin. Are arranged in a total of four squares.

  As shown in FIG. 14, the load cell 34 is connected to a fiber management device 18 which is a weighing device. The fiber management device 18 includes a fiber weight display 36, a fiber weight cumulative display 37, and a sandy soil batch counter 38 for each yarn supply device 1.

  In this way, the supply amount of the yarn 2 is detected by the load cell 34 and measured by the fiber management device 18. The amount of yarn supplied from each yarn supply device 1 is displayed on the fiber weight display 36, and the total numerical value is displayed on the fiber weight cumulative display 37. The amount of sand discharged is displayed on the sandy soil batch counter 38 as the number of batches.

  The yarn feeding device (calibration) 1 is of a birdcage type handy type, but in this case, it is necessary to install a plurality of units and make it larger and set a large number of yarns. Is considered. As an example, 28 yarns are set as a fiber management room, and the fibers are wound up beside the management room.

  On the other hand, in the construction by the continuous fiber reinforced earth method, mixing management of sand and continuous fiber is performed for each batch (sand is measured to 200 kg per batch). In such batch processing, it is necessary to measure a relatively small amount of yarn, and the continuous fiber mixing amount management method according to Patent Document 1 detects the amount of yarn supplied by the weight of the load cell. There is a risk of being unable to follow.

  The object of the present invention is to eliminate the inconvenience of the conventional example and to grasp the feeding length of the yarn, so that the yarn can be accurately measured, and the result is supplied at a constant weight ratio with respect to the weight of the sand. An object of the present invention is to provide a continuous fiber mixing amount management method in a reinforced earth method using continuous fibers, which can be reliably managed and construction accuracy can be further improved.

In order to achieve the above object, the present invention as set forth in claim 1 feeds a continuous fiber yarn from a spool wound in a yarn supply device, and ejects the fed yarn using high-pressure water or compressed air. In a reinforced earth construction method using continuous fibers that are jetted from a nozzle and pneumatically conveyed in the supply pipe to the fiber injection destination, and directly injected and mixed with the yarn, a measure that rotates by moving the yarn to the yarn supply device A yarn measuring means is provided by an encoder attached to the ring wheel, and the output of the encoder is introduced to the control device, and a feed roller that forcibly feeds the yarn by inserting or winding the yarn between the yarn supply device and the injection nozzle. provided, the output of the controller is introduced to the driving motor of the feed roller, detects the feed amount of the yarn by the rotation of the Enkoda, detected by the rotation of Enkoda yarn In feed amount is for summarized in that controlling the rotation of the feed roller.

  According to the first aspect of the present invention, in the ejector, when high-pressure water sent from the water tank through the high-pressure pump through the supply pipe is ejected from the ejection nozzle, the yarn is also ejected along with this and ejected from the sprayer. It is directly jetted and mixed with sand, but the amount of yarn supplied is measured as a length by an encoder attached to a measuring wheel that rotates by the movement of the yarn, measured by a fiber management device, and the numerical value is displayed. Since the discharge amount of sand is also displayed as the number of batches, these may be compared.

  As a result of comparison, when the supply amount of yarn does not match the discharge amount of sand, the discharge amount of yarn is adjusted by the water amount (water pressure).

In addition, since the yarn fed out from the yarn supply device is pulled out and sent by the feed roller, as an adjustment when the amount of yarn supplied does not match the amount of sand discharged, the amount of water (hydraulic pressure) at the ejector is adjusted. Appropriate adjustment is possible with the feed amount of the feed roller without relying on adjusting the discharge amount.

Injection Thus from 0.15 to 0.3% of the sand used in the (dry weight) of about or sand 1 m ³ per the 2.75~4.5kg / m ³ of continuous fibers (multifilament non-twist) with jet water, sand In order to mix three-dimensionally, the design mixing amount of continuous fiber 3.3kg / m ³ is secured. Discharge amount from the supply device of the thread (thread feeder) is expected to (amount of fibers covering the reinforced soil surface) 0.5% loss rate, and a ^{3.3kg / m 3 × 1.05 = 3.465kg} / m 3 and the management target, continuous The fiber injection amount can be measured by the yarn measuring means using the encoder of the present invention every time one batch of sand is discharged.

  As described above, the continuous fiber mixing amount management method in the reinforced earth method using continuous fibers of the present invention grasps the feed length of the yarn, so that the yarn can be accurately measured, and the result is constant with respect to the weight of the sand. Thus, it is possible to reliably manage the supply of the yarn at a weight ratio and to improve the construction accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of a continuous fiber mixing amount management method in a reinforced earth method using continuous fibers according to the present invention. As an apparatus for a reinforced earth method using continuous fibers, the conventional method shown in FIG. As an example, it is comprised by the sand supply apparatus 8 as a means to supply sand, and the thread supply apparatus 1 etc. as a means to supply continuous fiber.

  The means for supplying continuous fibers is a jetting device that uses a high-pressure water that is fed from a water tank 3 through a high-pressure pump 4 through a supply pipe 5 through a yarn feeding device 1 and a yarn 2 fed from the yarn feeding device 1. It consists of an ejector 7 that injects from a nozzle 6, and is combined with a sand supply device 8.

  On the other hand, the sand supply device 8 includes a measuring instrument 11 connected to the hopper 10 by a belt conveyor 9a, and a sprayer 12 connected to the measuring instrument 11 via a belt conveyor 9b. In the figure, reference numeral 13 denotes a tractor excavator for conveying sand from the sand pile 14, and 15 denotes a compressor for supplying compressed air to the sprayer 12. Reference numeral 16 denotes a generator serving as a power source for the measuring instrument 11, 17 denotes a distribution board, and 18 denotes a fiber management device that is a measuring device that measures the amount of yarn fed from the yarn supplying device 1.

  As shown in FIGS. 2 to 4, the yarn supply device 1 sets 28 windings of the yarn 2 as a fiber management room, and winds the fibers beside the management room. They are arranged in four horizontal rows and seven vertical rows, and the yarns 2 from the horizontal four rows of yarn windings 19 are wound around the measuring wheel 40 and then changed in direction by the dock tail guide 41 and guided outside by the spiral tube 42. 54 is a non-torque roller, 55 is a balloon guide, and 56 is a tensor.

  Between the bobbin 19 and the measuring wheel 40, a safety switch 43 by a limit switch is attached to the yarn 2 so that the yarn breakage or the like can be detected.

  A rotary encoder 44 is connected to the measuring wheel 40. As shown in FIG. 6, the output of the rotary encoder 44 is introduced into a control device (PCL) 45. The control device (PCL) 45 has an indicator 46. Connected. Further, the weighing output from the sand weighing instrument 11 and the output from the safety switch 43 are also introduced into the control device (PCL) 45.

  The output of the control device (PCL) 45 is introduced into a drive motor (AC servo motor) 48 of a feed roller (capstan) 47 described later.

The control device (PCL) 45 is a logic program of the following as a computer.
(1) Measured sand supply amount of sand = pulse x m3 / BH
(2) Measured yarn supply amount of yarn = pulse × m / pulse × number of yarn windings × weight / m (den)
(3) Yarn mixing amount Yarn supply amount (2) ÷ Sand supply amount (1) = Yarn mixing amount (4) Feed roller control mixing amount (3) (→ Fast) <Mixing amount set value <Mixing amount (3 (→ late)

  As shown in FIG. 1, the yarn 2 is placed between the yarn supply device 1 for storing the spool 19 of the continuous fiber yarn 2 and the ejector 7 for injecting the yarn 2 from the injection nozzle 6 using high-pressure water. A feed roller (capstan) 47 forcibly feeding out by winding is provided.

  In addition to using such a feed roller (capstan) 47, a support column 58 provided with a plurality of guide rings through which the yarn 2 is inserted is arranged between the yarn supply device 3 and the ejector 7. May be.

  FIG. 8 and FIG. 9 show an example of the feed roller 47. A feed roller (capstan) 47 is provided outside a box 49 containing a drive motor (AC servo motor) 48, and a non-torque roller 50 is provided around the feed roller 47. The yarn 2 was wound around a feed roller (capstan) 47 in an appropriate number. In the figure, reference numeral 51 denotes a stopper detection plate using a limit switch so that it can be detected as soon as the feed roller (capstan) 47 is threaded.

  The box 49 provided with the feed roller 47 is provided with a timer 59, a leakage breaker 60, a variable resistor 61, and a toggle switch 62. As will be described later, the variable resistor 61 is an adjustment switch that can change the discharge amount of the yarn when the supply amount of the yarn does not match the discharge amount of sand.

  Reference numeral 52 denotes a handle attached to the upper surface of the box 49, and reference numeral 53 denotes a leg made of an engineering plastic leveling pad provided on the lower surface.

  As shown in FIG. 10, the ejector 7 is constituted by a combination of a header 22 and a swinging means 23. The header 22 is combined with four yarn guides 24 for drawing the yarn 2 from the yarn supply device 1, and high-pressure water or compressed air. And four injection nozzles 6 for injecting the yarn 2.

  The swinging means 23 is pivotally attached to the other end of an arm 29 having one end attached to the base 30 with the cylinder 27 facing obliquely upward, and the upper end of the swinging arm 26 is pivotally pivoted to the tip of the piston 28 of the cylinder 27. The lower end of the peristaltic arm 26 was fixed to the rotating tube 25, and the rotating tube 25 was coaxially connected to the header 22. Then, the rotary pipe 25 is connected to the supply pipe 5 such as high-pressure water through a rotary joint. In the figure, 32 is an operation unit.

  Next, the operation will be described. A yarn supply device 1 is installed near a construction site such as a slope, and the yarn 2 as a continuous fiber fed from the spool 19 is guided outside by a spiral tube 42 and is ejected from the ejector 7. The injection nozzle 6 is inserted through the yarn guide 24.

  In the ejector 7, when high-pressure water sent from the water tank 3 through the high-pressure pump 4 through the supply pipe 5 is injected from the injection nozzle 6, the yarn 2 is also discharged along with this and the material hose 33 of the sprayer 12 is discharged. It is sprayed and mixed directly on the ground with sand that erupts on the slope ground.

  At this time, by operating the operating portion 32 of the ejector 7, the piston 28 of the cylinder 27 reciprocates, and accordingly, the upper end of the peristaltic arm 26 attached to the tip of the piston 28 moves along an arcuate locus. The lower end rotates at a fixed portion with the rotating tube 25. As a result, the rotating tube 25 rotates integrally with the lower end of the peristaltic arm 26, and this rotating motion is transmitted to the coaxial header 22, so that the header 22 also rotates. Thereby, the injection nozzle 6 provided in the header 22 moves along an arcuate locus.

  Therefore, if the operator holds the ejector 7 with his / her hand, the spray nozzle 6 automatically swings without moving his / her hand, the thread 2 and the jet water spray destination automatically reciprocate, and each part is uniformly sanded. Mix with. In addition, the ejector 7 may be ejected from the spray nozzle using compressed air instead of high-pressure water.

  The supply amount of the yarn 2 from the yarn supply device 1 is detected by a rotary encoder 44, and its output is introduced into a control device (PCL) 42, where it is measured, and the amount is displayed on a display 46. Is done. This display is displayed for each yarn and as a total numerical value, and the amount of sand discharged is displayed on the sandy soil batch counter as the number of batches.

  Further, a timing display board 63 as shown in FIG. 11 is used for stable supply of sand and continuous fibers. This obtains a signal from a measuring instrument 11 connected to the hopper 10 of the sand supply device 8 and informs the operator of the timing for measuring by the buzzer 64 and the indicator lamp 65 for each batch. In this sense, since the cycle time varies, the cycle time is determined by the timer 66 and is notified every batch.

  Start (upward), stop / reset (downward) operation is performed by the toggle switch 67, and simultaneously with the start of measurement, the buzzer 64 and the indicator lamp 65 are repeatedly displayed for 1 second every cycle by the timer 66. Stable supply can be performed simultaneously with the display. In the figure, 68 is a power indicator lamp, and 69 is a push button switch.

In this way, in order to secure a design mixing amount of 3.3 kg / m ³ for continuous fibers, the amount of injection from the yarn feeding device 1 (thread feeder) is expected to be 5.0% loss rate (the amount of fibers covering the reinforced soil surface). in, and manage target value ^{3.3kg / m 3 × 1.05 = 3.465kg} / m 3, the amount of continuous fiber injection every ejected sand batch and weighed by the measuring device of the feed apparatus 1 of the yarn. Further, the dispersibility of the fibers is examined by sampling with a core.

  In addition, as shown in FIG. 7, the management of a thread | yarn can also define an upper limit value, a management target value, and a lower limit value, and can also display a graph screen on the display 46.

  When the yarn supply amount does not match the sand discharge amount, the feed motor (capstan) 47 rotates by controlling the drive motor (AC servo motor) 48 with the output command of the control device (PCL) 45. Change the speed and adjust with this. In addition to or in place of this, the discharge amount of the yarn at the ejector 7 can be adjusted by the amount of water (water pressure) through the high-pressure pump 4.

  At this time, the measurement by the rotary encoder 44 is displayed on the display 46 as the fiber speed, and the rotation speed of the feed roller (capstan) 47 can be controlled based on this value.

It is explanatory drawing which shows one Embodiment of the mixing amount management method of the continuous fiber in the reinforced earthwork method by the continuous fiber of this invention. It is a front view of the supply apparatus (thread feeder) of a thread | yarn. It is a side view of a thread supply device (thread feeder). It is a top view of the supply apparatus (thread feeder) of a thread | yarn. It is a front view of a rotary encoder part. It is a control block diagram which shows one Embodiment of the mixing amount management method of the continuous fiber in the reinforced earthwork method by the continuous fiber of this invention. It is a front view which shows 1 screen with a display. It is a front view of a feed roller (capstan). It is a rear view of a feed roller (capstan). It is a top view of an ejector. It is a front view of a timing display board. It is a side view of a timing display board. It is explanatory drawing which shows the outline | summary of the continuous fiber reinforcement earth method. It is explanatory drawing which shows the former.

DESCRIPTION OF SYMBOLS 1 ... Yarn supply apparatus 2 ... Yarn 3 ... Water tank 4 ... High pressure pump 5 ... Supply pipe 6 ... Injection nozzle 7 ... Ejector 8 ... Sand supply apparatus 9a, 9b ... Belt conveyor 10 ... Hopper 11 ... Measuring instrument 12 ... Spraying Machine 13 ... Tractor excavator 14 ... Sand pile 15 ... Compressor 16 ... Generator 17 ... Distribution board 18 ... Textile management device 19 ... Pincushion 20 ... Guide stay 21 ... Bobbin case 22 ... Header 23 ... Peristaltic means 24 ... Thread guide 25 ... Time Moving tube 26 ... Peristaltic arm 27 ... Cylinder 28 ... Piston 29 ... Arm 30 ... Base 31 ... Slope 32 ... Operation part 33 ... Material hose 34, 34a, 34b, 34c ... Load cell 35 ... Feeding port 36 ... Fiber weight indicator 37 ... Accumulated fiber weight indicator 38 ... Sandy soil batch counter 40 ... Measuring wheel 41 ... Dock tail guide 42 ... Spiral tube 43 ... Safety switch 44 ... Rotary encoder 45 ... Control device (PCL)
46 ... Display 47 ... Feed roller (capstan)
48 ... Drive motor (AC servo motor)
49 ... Box 50 ... Non-torque roller 51 ... Stopper detection plate 52 ... Hand 53 ... Leg body 54 ... Non-torque roller 55 ... Balloon guide 56 ... Tensor 58 ... Strut 59 ... Timer 60 ... Earth leakage breaker 61 ... Variable resistor 62 ... variable resistor 63 ... timing display panel 64 ... buzzer 65 ... indicator light 66 ... timer 67 ... toggle switch 68 ... power indicator light 69 ... push button switch

Claims (1)

The yarn of the continuous fiber is fed out from the spool stored in the yarn feeding device, and the fed yarn is jetted from the jet nozzle of the ejector using high-pressure water or compressed air, while the earth and sand are delivered to the jet destination of the fiber. In the reinforced earth method using continuous fibers that are pneumatically conveyed in the supply pipe and directly injected and mixed with the yarn, the yarn supply device is provided with a yarn measuring means by an encoder attached to a measuring wheel that is rotated by the movement of the yarn . The output is introduced into the control device, and a feed roller is provided that forcibly feeds the yarn by inserting or winding the yarn between the yarn supply device and the injection nozzle, and the output of the control device is introduced into the drive motor of the feed roller and detects the feed amount of the yarn by the rotation of the Enkoda, in feed amount of yarn detected by the rotation of Enkoda, the rotation control of the feed roller Mixed amount management method of the continuous fibers in the reinforced earthwork method by continuous fibers, wherein the cormorants.

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