Re-vibration device for concrete leveling

Abstract

To provide an unmanned concrete leveling re-vibration device capable of improving durability by suppressing cracks of concrete while labor-saving.SOLUTION: The concrete leveling re-vibration device includes: a vibrator as the vibration source; a re-vibration motor for generating longitudinal vibrations by vibrating the vibrator; a blade having a uniform propagation control beam capable of controlling the propagation of the vibration from the vibrator for propagating the longitudinal vibration generated by the re-vibration motor inside ready-mixed concrete; power receiving means for receiving motor control signals and the power from a battery placed in a carrier device when used in conjunction with the carrier device; a connecting means for isolating vibrations from the vibrator and absorbing the tilt of the carrier device; and a handle operating device that is configured so as to, when used alone, connect, attachment means for detachably attaching the motor control signal and battery to the main body of the device by means of the connecting means.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a re-vibrating device for leveling concrete, and particularly to a re-vibrating device suitable for draining water or air in concrete floor construction.

Background Art

[0002] Conventionally, in concrete floor construction, a concrete floor leveling device has been used to make the surface of the concrete floor uniform. Various devices have been used, such as a type that an operator holds by hand and works, a type that is integrated with a traveling vehicle and the operator levels while walking, and a type equipped with a laser screed machine.

[0003] Currently, such a concrete leveling device generally uses a generator of a gasoline engine as a power source. As an example of such a concrete leveling device, the device described in Japanese Patent Application Laid-Open No. 6-66027 (Patent Document 1) can be mentioned. The device of Patent Document 1 is a walking type in which an operator holds a handle and levels the concrete while walking. As a power source, a generator of a gasoline engine is used, and the electric energy generated by the generator is stored in a battery to supply necessary electric power.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a walking-type concrete leveling device such as Patent Document 1, since workers walk on the steel bars into which fresh concrete has been poured to perform the leveling work, the burden on the workers is large, and it was necessary to arrange a plurality of personnel such as workers. As a vibration power source, in the case of using a gasoline engine, the vibration frequency can only be increased up to about 130 Hz even at the maximum rotational speed of the engine, and it is impossible to lower the viscosity rate (liquefy) by re-vibrating against cement mortar with a high mixing ratio (hard). As a result, air bleeding and water bleeding become incomplete, and in order to construct with cement mortar having a low mixing ratio, the management becomes complicated due to the process of adjusting the amount of additives to lower the viscosity rate by using additives. In addition, since the vibration propagated by moving away from the vibration source of the leveling device is attenuated, the re-vibration frequency to the cement mortar is insufficient, and it is necessary to perform overlapping work because it is necessary to apply additional vibration to the insufficient part, which not only increases the personnel burden but also has problems such as inability to improve costs, environment, etc. due to an increase in the number of personnel when working within a limited time. Furthermore, since exhaust gas is generated by the gasoline engine, there are not only major environmental problems such as considerations for sufficient ventilation at a construction site with insufficient ventilation, but also problems such as the inability to miniaturize because the running tires become large due to the need to increase the ground contact area to reduce damage to the steel bars due to the heavy weight of the device.

[0006] In addition, conventionally, the problem of cracking due to insufficient compaction of the concrete floor during leveling has remained significant. There is a current situation where repair of cracks of 0.5 mm or more is unavoidable in the defect warranty within two years after completion. The reason is that during the leveling process, vibration has been carried out by a vibrator with a rod and a tamping machine during leveling. However, most of it is at the time of leveling, and no re-vibration has been carried out after the water channels in the concrete have started to form. Therefore, after the conventional compaction, the finishing has been carried out with the water channels remaining formed, leaving the floor finishing in a state where bubbles and voids remain in the concrete. As a result, after completion, due to abrasion and impact from the outside during forklift driving and storage of heavy objects from the bubbles and voids in the concrete, cracks occur in a short period of time.

[0007] An object of the present invention is to solve such conventional problems, provide a re-vibration device for concrete leveling that suppresses cracking of concrete, improves durability, and aims for labor saving and unmanned operation. Another object of the present invention is a re-vibration device for removing bubbles and voids in concrete during concrete leveling, and a device for suppressing cracking and achieving labor saving by automatic traveling.

Means for Solving the Problems

[0008] In order to solve the above problems, a re-vibration device for concrete leveling according to the present invention includes, in a re-vibration device for concrete leveling, a vibrator serving as a vibration generating source, a re-vibration motor that vibrates the vibrator to generate vertical vibration, a blade that propagates the vertical vibration generated by the re-vibration motor into fresh concrete, power receiving means for receiving a motor control signal and battery power installed in the conveying device when used in connection with the conveying device, a vibration transmission bar composed of a uniform transmission control beam that is connected to the vibrator and can control the propagation by isolating the vibration from the vibrator, a lifting mechanism for raising and lowering the vertical position of the re-vibration device, and a shock absorber provided in the lifting mechanism for absorbing the vibration of the re-vibration device and absorbing the inclination of the conveying device.

[0010] A plurality of vibration transmission rods are evenly and dispersedly arranged on the vibration transmission bar, and are configured to propagate vertical vibration to the blade through the vibration transmission rods.

[0011] A plurality of the vibrators are provided, the uniform transmission control beam includes a frame for mounting the vibrator, and is configured to propagate the vertical vibration from the vibrator to the blade through the frame, and further includes a connecting rod for connecting the vibrators.

[0012] It further includes a scraper for leveling the surface of fresh concrete and a slider for preventing the vertical vibration of the blade from being transmitted to the scraper.

Effects of the Invention

[0015] According to the present invention, in order to improve the process in which cracks occur, bubbles and voids are removed by a self-propelled type vibrator that can perform re-vibration work after the water channels start to form during leveling, and by making it unmanned, quality improvement and labor saving can be achieved. Conventional engine-type vibrating devices have had differences in vibration numerical values at the center and both ends, or there have been many machines that have not been digitized, and it could not be said to have a quantitative and uniform tightening. The models of the present invention can uniformly the difference between the center and the ends and quantify it, enabling dense tightening across the entire floor surface and uniformly removing bubbles and voids.

Brief Description of the Drawings

[0016] The drawings show specific embodiments of the present invention according to the present disclosure, including not only the essential configurations of the invention but also optional and preferred embodiments.

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Mode for Carrying Out the Invention

[0017] <Summary of the First Embodiment> As shown in FIGS. 4(a)(b) and FIGS. 3(a)(b), the concrete leveling and re-vibration device 1a of the first embodiment is connected to the connection joint 4(33) of the conveying device 2a through the connection part 3 (lock lever 17) of the device itself to form a concrete leveling device. The operator 44 remotely controls it wirelessly by the remote controller 43 shown in FIG. 6 below to improve the efficiency of the re-vibration operation and leveling work of the concrete. The conveying device 2a is provided with swivel casters 5, and two small wheels are provided on each side with a stagger. Such an arrangement configuration is adopted to improve the turning performance of the conveying device traveling on the wire mesh and its meshing with the wire mesh.

[0018] <Configuration of the First Embodiment> <Re-vibration Device for Concrete Levelling of the First Embodiment> As shown in FIGS. 1 and 2, the re-vibration device 1 for concrete levelling includes a vibration transmission bar 18, vibration transmission rods 19a, 19b, 19c, 19d, a re-vibration motor 12, a blade 13, sliders 15a, 15b, a scraper 16, and a lock lever 17. Here, the vibration frequency of the re-vibration device 1a for concrete levelling is 50 - 300 Hz, and the vibration acceleration is 7G or more.

[0019] <Vibrator> One vibrator 11 is provided in the middle. It rotates two pendulums in the reverse direction, cancels out the front-back vibration, and extracts the up-down vibration. The vibrator 11 is connected to the vibration transmission bar 18 and is installed on the blade 13 via four vibration transmission rods 19a, 19b, 19c, 19d evenly distributed on the vibration transmission bar 18. The two pendulums for vibration in the vibrator are meshed with the gear provided in the re-vibration motor 12 and the gear provided at the center of the vibration transmission bar 18, and the driving force of the re-vibration motor 12 is transmitted to rotate them in the reverse direction. Then, the vibration from the vibrator 11 is uniformly transmitted to the blade 13 via the four vibration transmission rods 19a, 19b, 19c, 19d. Here, the vibration transmission bar 18 constitutes a uniform propagation control beam capable of transmitting and controlling the vibrator vibration. Thereby, the front-back vibration of the blade 13 is cancelled out, only the up-down movement of the vibration of the vibrator 11 is extracted, the blade 13 is vertically vibrated in a state of uniform propagation, and the water drainage and air extraction in concrete construction are performed. The vibration frequency of the vibrator can realize a variable vibration amplitude in the range of 50 Hz to 300 Hz. This can greatly improve the performance compared with the conventional re-vibration devices whose products around the vibration frequency of 130 Hz were mainly used. As a result of comparing the re-vibration device of Embodiment 1 with the conventional product with the vibration frequency adjusted to 130 Hz, in the conventional device, the vibration acceleration was about 5G in the middle of the blade and about 1G at both ends, while in the re-vibration device of Embodiment 1, the vibration acceleration was uniformly stable at about 20G ± 10% on average in the middle and at both ends of the blade. The performance was improved by 20 times at both ends of the blade and 4 times in the middle of the blade.

[0020] The vibration standard for the re-vibration device (vibrating device) stipulated in the Labor Standards Law is 2.5 m / s2 (0.26 G) or less. Although no special measures are required in particular, except for special cases, it is restricted within 2 hours for the time being. 5 m / s2 (0.52 G) ≥ A(8) ≥ 2.5 m / s2 (0.26 G): Efforts are made to suppress the usage time and select vibration tools with low vibration. Measures are to be taken so that it does not exceed 5 m / s2 (0.52 G). Therefore, if the operator of the re-vibration device does not change, continuous use of the device is difficult.

[0021] In the re-vibration device of the first embodiment, it is connected to the conveying device described later, and the operator realizes the concrete leveling device with a remote control. Therefore, the operator is not affected by the vibration of the device, and the labor environment is improved and the work efficiency is increased due to unmanned operation. <Re-vibration motor>

[0022] The re-vibration motor 12 is powered by a battery 22 (for example, a lithium-ion battery) and driven. The re-vibration motor 12 has the role of generating re-vibration (tamping) of the blade 13. That is, the re-vibration motor 12 is a vibration source, and it transmits only vertical vibration from the vibrator vibration to the blade 13 through four vibration transmission rods 19a, 19b, 19c, and 19d evenly distributed from the vibration transmission bar 18, and performs water drainage and air extraction for the water accumulated inside the fresh concrete during concrete construction, and takes preventive measures such as preventing cracks during concrete construction.

[0023] <Blade> The blade 13 generates vertical vibration by a vibrator with the above-described structure, and is for draining water and extracting air accumulated inside the fresh concrete at the site during concrete construction. The length of the blade 13 is about 2 m, and the length can be appropriately changed in consideration of the power of the conveying device described later.

[0024] <Slider> The sliders 15a and 15b are structured to be movable freely up and down and are configured not to transmit the vertical vibration from the re-vibrator 2 to the scraper 16. The reason for this structure is that the sliders 15a and 15b do not affect the leveling operation of the fresh concrete surface by the scraper 16. If vibration is transmitted to the scraper 16, not only can uniformity not be maintained, but damage due to vibration shock will also be caused.

[0025] <scraper> The scraper 16 operates to level the concrete surface uniformly. The scraper 16 is supported by the sliders 15a and 15b attached at two locations on the left and right. This scraper 16 has a length that protrudes slightly beyond the blade 13. This is to completely uniformize the concrete surface from which water and air have been removed by the blade 13. By making the length of the scraper 16 slightly longer than the blade 13, it also has the effect of eliminating the convex streaks formed by the phenomenon of the concrete being bounced off the blade end.

[0026] <lock lever> The lock lever 17 is for connecting and pulling the re-vibrator 1a to the concrete leveling transport device 2a. It is attached to the connecting joint 33 of the transport device 2a by the lock lever 17 so that the towing hook mechanism 32 does not come off. Incidentally, the towing hook mechanism 32 integrally constitutes a slider mechanism that attenuates the vibration of the blade 13. The concrete leveling transport device 2a performs remote transport of the concrete leveling re-vibrator 1a by an operator (not shown).

[0027] <First Embodiment: Concrete Leveling Transport Device> As shown in FIGS. 1 and 2, the concrete leveling conveyor device 2a includes a housing 21, a lithium-ion (Li-ion) battery 22, a compressor 23, a motor driver 24, a converter 25, re-vibration motors 26a and 26b, tooth profiles 27a and 27b, a gearbox 28, wheels 29a and 29b, detachable auxiliary tires 30a and 30b, lifting mechanisms 31a and 31b for vertically lifting the re-vibration device 1 for concrete leveling, a towing hook mechanism 32, and a connecting joint 33. The partial enlarged view of FIG. 1 is shown in FIGS. 2(a), (b), and (c). FIG. 2(a) is an enlarged view of the towing hook part, FIG. 2(b) is an enlarged view of the slider part, and FIG. 2(c) is an enlarged view of the re-vibration motor part.

[0028] <Housing (main body)> The housing (main body) 21 houses drive control mechanisms such as the motors 26a and 26b, converter, motor driver 24, gearbox 28, and compressor 23 of the conveyor device. As shown in FIGS. 3(a) and (b), actually, a cover is attached to the housing to form a sealed structure. This is to prevent fresh concrete from entering the housing (main body) when the concrete leveling operation is performed. The compressor 23 is connected to a radiator 35 (not shown) by a metal pipe and circulates water inside the housing to cool the inside of the housing.

[0029] <Lithium-ion battery> The lithium-ion battery 22 supplies power to the motors of the conveyor device 2 and the re-vibration device 1. The lithium-ion battery 22 is a battery that can pass a large-capacity current and can pass the large current required to operate the device. As other batteries, nickel-metal hydride, lead batteries, etc. can be used. The batteries used for the conveyor device 2 and the re-vibration device 1 are not limited to this, and the use of a solar power generation system, a hydrogen fuel battery, etc. is also possible.

[0030] <Compressor> Since heat is generated in the motor part of the compressor 23, it is for circulating a cooling medium to the motor. The compressor 23 is connected to a radiator 35 by a metal pipe (not shown).

[0031] It is also possible to replace it with heat dissipation fins, a cooling fan, etc. as a heat dissipation system capable of cooling the motor.

[0032] <Motor driver> The motor driver 24 is composed of a drive circuit board for driving a DC motor and has functions such as overcurrent and leakage protection for the motor. These drive circuit boards and the like are protected by the housing 21, and it is preferable that the structure is such that fresh concrete does not enter the housing 21 during the concrete leveling operation.

[0033] <Converter> The converter 25 boosts the DC voltage to generate the voltage required within the device.

[0034] <Motor> The motors 26a and 26b rotationally drive the two wheels 29a and 29b and supply the driving force for the conveyance of the re-vibration device 1a. Since the motors 26a and 26b are respectively provided on the wheels 29a and 29b and adopt an independent drive control structure, the power of the driving force can be increased. When moving to the work site, the wheels 29a and 29b are rotated and propelled by independent control. During concrete leveling, the motors 26a and 26b perform phase control, synchronize to rotate the wheels 29a and 29b, and perform straight running. Thereby, the variation in the concrete leveling operation is eliminated.

[0035] <Tooth profile> The tooth shapes 27a and 27b are configured such that the outer circumferences of the wheels 29a and 29b that run while biting into the wire mesh (reinforcing bars) have a tooth shape. This tooth shape can be appropriately changed according to the pitch (interval) of the reinforcing bars. For example, when the pitch of the reinforcing bars is short, the peaks of the tooth shape are made smaller, and when the pitch of the reinforcing bars is large, the shape of the peaks of the tooth shape is made larger. Configuration examples of a wire mesh in which reinforcing bars are welded in a grid pattern (or the reinforcing bars are connected) are shown in FIGS. 7 and 8. In the example of FIG. 7, a wire mesh in which round reinforcing bars (FIG. 7(a)) are assembled and welded in a grid pattern is shown (FIGS. 7(b) and 7(c)). In the example of FIG. 8, a wire mesh in which square twisted reinforcing bars (FIG. 8(a)) are assembled and welded in a grid pattern is shown (FIGS. 8(b) and 8(c)). For example, it is what is called a screw mesh (registered trademark). When these pitch P (interval between reinforcing bars) sizes are 100 mm, 150 mm, 200 mm, etc., by appropriately changing the tooth shape and using it, when traveling by the conveying device, the tooth shapes 27a and 27b of the wheels 29a and 29b and the wire mesh mesh firmly, and the traveling becomes stable. The meshing state between the tooth shape 27a of this wheel (wheel) and the wire mesh is shown in FIG. 20.

[0036] <Gearbox> The gearbox 28 transmits the driving force of the motors 26a and 26b. It is provided on both sides of the wheels 29a and 29b, and meshes with the gears provided on the wheels 29a and 29b and the motors 26a and 26b respectively, and a desired driving force can be obtained.

[0037] <Wheel> The wheels 29a and 29b have a plate thickness (5 mm) and a round hole shape to ensure drivability in fresh concrete. Through experiments, it has been found that there is no strength problem as long as the plate thickness is 5 mm or more. The diameter (size) of the wheels 29a and 29b is designed such that at least the re-vibrator can float in the air from the concrete surface with respect to the depth of fresh concrete being 40 mm to 200 mm. That is, the conveying device 1a is installed at the site for leveling the fresh concrete surface, and is set to a size such that it does not sink into the fresh concrete when the re-vibrator is connected. When the re-vibrator can be lifted upward by the lifting mechanism described later and floated, it may be in slight contact with the fresh concrete surface at the installation stage of the device. As the material of the wheels, metal materials such as aluminum and stainless steel can be used to ensure the strength and durability of the device. The weight of the conveying device at this time is about 85 Kg. The wheels 29a and 29b are provided with circular cutouts (holes or openings) of different sizes. This has the effect of reducing the resistance of the conveying device traveling in the fresh concrete and improving the propulsion force when leveling the fresh concrete. The circular cutouts of different sizes on the wheels 29a and 29b are not limited to circular shapes, and may also be in shapes such as square, elliptical, and rhombic.

[0038] The clearance between the wheel and the main body is ensured to be 40 mm or more. The reason is that among the concrete materials, the aggregates such as sand and gravel are about 24 mm, and assuming a maximum of 40 mm, a clearance of 40 mm is ensured. Also, during the concrete leveling operation, the size of the cutout (hole) should be about 35 mm to 40 mm in diameter so that the gravel and stones of the concrete aggregates can pass through the cutout (hole) of the wheel.

[0039] <Detachable auxiliary tire> The detachable auxiliary tires 30a and 30b are mounted during device transportation. They are for protecting the teeth (tooth shapes 27a and 27b) of the wheels 29a and 29b from chipping during transportation. Also, they have a structure that disconnects the drive during transportation and makes the wheels free.

[0040] <Lifting mechanism> The mechanism has a function of raising and lowering the vertical position of the re-vibrator 1a for leveling concrete according to the height of the concrete surface, and suppresses the large left and right inclination of the re-vibrator for leveling concrete due to external forces. As shown in Figs. 21(a) and (b), this lifting mechanism is composed of a lift motor 51 and guide rails 52 and 53. Generally, the fresh concrete floor is constructed in the range of about 40 mm to 200 mm from the upper end of the wire mesh 45. Therefore, the lift motor 51 is moved up and down so that the leveling operation of the concrete can be performed even when the depth of the fresh concrete varies in the range of about 40 mm to 200 mm, and the height of the re-vibrator 1a is adjusted. A detection sensor for detecting the concrete surface may be installed to automatically adjust the height of the re-vibrator, or it may be manually adjusted. When remote transportation or automatic transportation is performed, it is preferable to use an automatic height adjustment mechanism. Fig. 21(a) shows the case where the depth of the fresh concrete is shallow, and Fig. 21(b) shows the case where the depth of the fresh concrete is deep. The guide rails 52 and 53 correspond to the lifting mechanisms 31a and 31b in Fig. 1.

[0041] The suppression means provided in the re-vibrator 1a for leveling concrete and the lifting mechanism during suppression includes two shock absorbers 37 for absorbing the vibration of the re-vibrator 1a for leveling concrete. These two shock absorbers 37 adjust the horizontal angle of the blade 13 of the re-vibrator 2a. The two shock absorbers 37 are provided on each side of both wheels, and the horizontal angle is adjusted by adjusting the thickness of the springs of the two shock absorbers 37. As a result, even if the transport device 2a is tilted, the blade 13 always contacts the concrete surface, so that uniform concrete leveling without unevenness can be realized.

[0042] <Traction Hook Mechanism> The traction hook mechanism 32 is for connecting the re-vibrator 2a via a connecting joint 33. This traction hook mechanism 32 adjusts the horizontal angle of the blade 13 of the re-vibrator 2a. The re-vibrator 1a and the transport device 2a are connected via a shock absorber 34, and the transport device 2a has a structure that is not affected by re-vibration.

[0043] <Concrete leveling operation> The following describes the concrete leveling operation. Load the re-vibrator 1 and the conveyor 2 onto a truck or the like and transport them to the work site. When the worker arrives at the site of the concrete floor leveling operation, connect the re-vibrator 1 and the conveyor 2. When the conveyor 2 is being transported, since the detachable auxiliary tires 30 are mounted on both wheels of the conveyor 2, remove the detachable auxiliary tires 30 of both wheels. This state is shown in FIG. 3.

[0044] As shown in FIG. 6, place the conveyor 2a on the wire mesh (reinforcing bar) 45 at the concrete leveling work site 41 and perform the leveling operation on the concrete surface. After the leveling operation, it is uniform as shown in 42. Since the worker 44 is remotely operating outside the work site with a remote control 43 or the like, the working environment of the worker 44 is improved and the working efficiency can be increased. Here, in order to prevent fresh concrete from entering the motor and drive circuit of the conveyor 2 during the concrete leveling operation, the mechanisms such as the motor and drive circuit other than the wheels 29a and 29b are sealed inside the housing 21. As shown in FIG. 17, in addition to the above-described configuration, the concrete leveling conveyor 1 includes a wireless communication unit 171 that communicates with the remote control 43, a controller (computer) 172 that controls the entire system, a detection sensor 173 that detects the concrete surface, and a height adjustment unit 174 for bringing the bottom surface of the blade 13 of the re-vibrator into contact with the detected concrete surface. The battery 22 supplies power to the concrete leveling conveyor and the concrete leveling re-vibration layer. Since the other configurations have been described above, the description thereof is omitted. The concrete leveling operation (re-vibration tamping and leveling operation) by remote control will be described with reference to FIG. 19. First, connect the re-vibrator 1a and the conveyor 2a in advance and install them at the work site 41. In this state, when the worker 44 turns on the switch of the remote control 43, the power of the controller 172 is turned on from the remote control 43 via the wireless communication unit 171 (step 1901). The controller 172 determines whether or not to stop the operation (step 1902). If it is not stopped, that is, in the operating mode state, first, the concrete surface is detected (step 1903). The height of the blade 13 is adjusted so that the vibrating surface contacts the detected surface (step 1904). Next, the concrete tamping (re-vibration compaction) is started (step 1905), and the concrete leveling is started (step 1906). That is, the conveying device 2a pulls the re-vibration device and travels (step 1907). This operation is performed for the entire work site area. When the controller 172 receives an operation stop signal from the remote controller 43, the operation ends (step 1908). The above description has been about the remote control by the remote controller. However, an automatic control program may be built into the conveying device, and it may be configured to automatically perform the re-vibration and leveling operations by pressing the operation start button.

[0045] The concrete leveling operation by the manual concrete leveling re-vibration device will be described.

[0046] As shown in FIG. 9, when manually performing the concrete re-vibration (tamping) and surface leveling operations, the above-described re-vibration device 1a is transported to the concrete leveling work site 41, the attachment means 90 is attached, and the re-vibration (tamping) and the leveling operation of the concrete surface are performed. After the leveling operation, it is uniform as shown in 42. Specifically, the detachable lithium-ion battery 92 and the controller 93 are connected, and one end of the controller 93 is connected to the operation switch 91. The other end is connected to the re-vibration motor. Thus, the setting is completed. As shown in FIG. 18, when the operation switch 181 is turned on, the controller 182 powered by the lithium-ion battery 92 drives the motor driver to start the re-vibration motor and perform the re-vibration (tamping) as described above to drain the water. Also in the manual re-vibration, by using the battery as the drive source and increasing the vibration frequency, the quality of the concrete surface leveling operation is improved.

[0047] Thus, according to the first embodiment, it is possible to realize a re-vibration device for concrete leveling that suppresses cracks in concrete, improves durability, and achieves labor saving and unmanned operation. In addition, by automatically traveling, it is possible to suppress cracks and save labor.

[0048] <Second Embodiment Outline> As shown in FIGS. 13(a)(b) and FIG. 12(a), the re-vibration device for concrete leveling in this second embodiment is configured as a concrete leveling device by connecting to the connection joint 4(33) of the conveying device 2 via the lock lever 17 of the device itself, and is remotely controlled wirelessly by an operator using a remote controller (not shown) to streamline the re-vibration operation and leveling operation of the concrete.

[0049] <Second Embodiment Configuration> <Re-vibration Device for Concrete Leveling in the Second Embodiment> As shown in FIGS. 10 and 11, the re-vibration device 1 for concrete leveling includes vibrators 11a, 11b, a re-vibration motor 12, a blade 13, a frame 14, sliders 15a, 15b, a scraper 16, and a lock lever 17. Here, the vibration frequency of the re-vibration device 1 for concrete leveling is 50 - 300 Hz, and the vibration acceleration is 7G or more.

[0050] <Vibrator> The vibrators 11a and 11b are provided at two locations on the left and right. They rotate two pendulums in the reverse direction, cancel out the front-back vibration, and extract the up-down vibration. The vibrators 11a and 11b are connected by a connecting rod 18. The two pendulums for vibration in the vibrator are meshed with the gear in the re-vibration motor 12 and the gear provided at the end of the connecting rod 18 to align the phases in the respective vibrators, so that they vibrate in the same direction simultaneously, transmit the driving force of the re-vibration motor 12, and are rotated. As a result, the front-back vibration of the blade 13 is canceled out, the vibrations of the vibrators 11a and 11b are extracted only as up-down movement, the blade 13 is vertically vibrated, and water drainage and air extraction during concrete construction are performed. The vibration frequency of the vibrator can vary in the range of 50 Hz to 300 Hz to realize a variable vibration amplitude. This has significantly improved the performance compared to the conventional re-vibration devices whose products were mainly around a vibration frequency of 130 Hz. As a result of comparing the re-vibration device of Embodiment 2 with a conventional product with the vibration frequency adjusted to 130 Hz, in the conventional device, the vibration acceleration was about 5G in the middle of the blade and about 1G at both ends, while in the re-vibration device of Embodiment 2, the vibration acceleration was uniformly stable at about 20G ± 10% on average in the middle and at both ends of the blade. The performance was improved by 20 times at both ends of the blade and 4 times in the middle of the blade.

[0051] The vibration standard for the re-vibration device (vibration device) defined in the Labor Standards Law is 2.5 m / s2 or less (0.26G), and although no special measures are required, except for special cases, it is restricted within 2 hours for the time being. 5 m / s2 (0.52G) ≥ A(8) ≥ 2.5 m / s2 (0.26G): Efforts are made to suppress the usage time and select vibration tools with low vibration. Measures are to be taken so as not to exceed 5 m / s2. Therefore, if the operator of the re-vibration device does not change, continuous use of the device is difficult.

[0052] In the re-vibration device of this Second Embodiment, it is connected to the transport device described later, and the operator realizes a concrete leveling device with a remote control. As a result, the operator is no longer affected by the vibration of the device, and the labor environment is improved and the work efficiency is increased due to unmanned operation.

[0053] <DC Motor for Resonant Vibration> The resonant vibration motor 12 is powered and driven by the lithium-ion battery 22. The resonant vibration motor 12 has the role of generating resonant vibration of the blade 13. That is, it transmits only vertical vibration to the blade 13, drains water and air accumulated inside the concrete construction, and takes preventive measures such as preventing cracks during concrete construction. The above-described vibration is applied to the vibrators 11a and 11b.

[0054] <Blade> The blade 13 generates vertical vibration by a vibrator having the above-described structure, and is for draining water and air accumulated inside the fresh concrete at the site during concrete construction. The length of the blade 13 is about 2 m, and the length can be appropriately changed in consideration of the power of the conveying device described later.

[0055] <Frame> The frame 14 is configured with a length and weight such that the natural frequency matches the vibration wavelength of the vibrator. Specifically, it is preferably slightly shorter than the length of the blade 13. The vibrators 11a and 11b are attached to the frame 14, and the vertical vibration generated by the vibrator can be evenly propagated in the longitudinal direction of the blade 13.

[0056] <Slider> The slider 15 has a structure that can move freely up and down, and is structured not to transmit the vertical vibration from the resonant vibration device 2 to the scraper 16. The reason for this structure is that the slider 15 does not affect the leveling operation of the fresh concrete surface by the scraper 16. If vibration is transmitted to the scraper 16, not only will uniformity not be maintained, but damage will also be caused by the vibration impact.

[0057] <Scraper> Scraper 16 operates to level the concrete surface evenly. The scraper 16 is supported by sliders 15a and 15b attached at two positions on the left and right. This scraper 16 has a length that protrudes slightly beyond the blade 13. This is to completely even out the concrete surface from which water and air have been drained by the blade 13. By making the scraper 16 slightly longer than the blade 13, it also has the effect of eliminating the convex streaks formed by the phenomenon of the concrete being bounced back to the blade end.

[0058] <Lock Hook> The lock hook 17 is for connecting and towing the re-vibration device 2 to the concrete leveling transport device 2. The towing hook mechanism 32 is attached to the connecting joint 33 of the transport device 2 by the lock hook 17 so that it does not come off. Incidentally, the towing hook mechanism 32 integrally constitutes a slider mechanism that attenuates the vibration of the blade 13. The concrete leveling transport device 2b is remotely transported by an operator (not shown) of the concrete leveling re-vibration device 1b.

[0059] <Second Embodiment: Concrete Leveling Transport Device> As shown in FIGS. 10 and 11, the concrete leveling transport device 2 includes a housing 21, a lithium-ion (Li-ion) battery 22, a compressor 23, a motor driver 24, a converter 25, motors 26a and 26b, tooth profiles 27a and 27b, a gearbox 28, wheels 29a and 29b, detachable auxiliary tires 30a and 30b, a lifting mechanism 31 for vertically lifting the concrete leveling re-vibration device 1b, a towing hook mechanism 32, and a connecting joint 33. The partial enlarged view of FIG. 10 is shown in FIGS. 12(a), (b), and (c). FIG. 12(a) shows the enlarged view of the towing hook part, FIG. 12(b) shows the enlarged view of the slider part, and FIG. 12(c) shows the enlarged view of the re-vibration motor part.

[0060] <Housing (Main Body)> The housing (main body) 21 houses drive control mechanisms such as the motor, converter, motor driver, gearbox, and compressor of the conveying device. As shown in FIGS. 14(a) and 14(b), actually, a cover is attached to the housing to form a sealed structure. This is to prevent fresh concrete from entering the housing (main body) when the concrete leveling operation is performed.

[0061] <Lithium-ion battery> The lithium-ion battery 22 supplies power to the motors of the conveying device 2 and the re-vibrating device 1. The lithium-ion battery 22 is a battery that can pass a large-capacity current and can pass the large current required to operate the device. As other batteries, nickel-metal hydride, lead batteries, etc. can be used. The batteries used for the conveying device 2 and the re-vibrating device 1 are not limited to this, and solar power generation systems, hydrogen fuel batteries, etc. can also be used.

[0062] <Compressor> Since heat is generated in the motor part of the compressor 23, it is for circulating a cooling medium to the motor. It is also possible to replace it with a heat dissipation fin, a cooling fan, etc. as a heat dissipation system capable of cooling the motor.

[0063] <Motor driver> The motor driver 24 is composed of a drive circuit board etc. for driving the motor and has functions such as overcurrent and leakage protection for the motor. These drive circuit boards etc. are preferably protected by the housing 21 and have a structure in which fresh concrete does not enter the housing 21 during the concrete leveling operation.

[0064] <Converter> The converter 25 generates the required voltage in the device from the DC voltage.

[0065] <DC motor> Motors 26a and 26b rotationally drive the two-wheeled toothed wheels 29a and 29b, and supply the driving force for the conveyance of the re-vibrator 1. Since the motors 26a and 26b are respectively provided on the wheels 29a and 29b and adopt an independent drive control structure, the power of the driving force can be increased. When moving at the work site, the wheels 29a and 29b are rotated and propelled by independent control. When leveling the concrete, the motors 26a and 26b perform phase control, synchronously rotate the wheels 29a and 29b, and perform straight running. Thereby, the variation in the concrete leveling work is eliminated.

[0066] <Tooth shape (tooth profile shape)> The tooth shapes 27a and 27b are configured such that the outer periphery that engages with the wire mesh (reinforcing bar) and travels has a tooth profile shape. This tooth profile shape can be appropriately changed according to the pitch (interval) of the reinforcing bars. For example, when the pitch of the reinforcing bars is short, the peaks of the tooth shape are made smaller, and when the pitch of the reinforcing bars is large, the shape of the peaks of the tooth shape is made larger.

[0067] <Gearbox> The gearbox 28 transmits the driving force of the motors 26a and 26b. It is provided on both sides of the wheels 29a and 29b, and gears provided on the wheels 29a and 29b and the motors 26a and 26b respectively mesh with each other, and a desired propulsive force can be obtained.

[0068] <Wheel> The wheels 29a and 29b have a plate thickness (5 mm) and a round - cut - out shape to ensure drivability in fresh concrete. Through experiments, it was found that as long as the plate thickness is 5 mm or more, there is no strength problem. As the material of the wheels, metal materials such as aluminum and stainless steel can be used to ensure the strength and durability of the device. The weight of the conveying device at this time is about 85 Kg. The wheels 29a and 29b are provided with large and small circular notches (holes or openings). When the leveling operation of fresh concrete is carried out, this has the effect of reducing the resistance of the conveying device traveling in the fresh concrete and improving the propulsion force. The large and small circular notches of the wheels 29a and 29b are not limited to circular shapes, and can also be in shapes such as square, elliptical, and rhombic.

[0069] The clearance between the wheel (tyre) and the body is ensured to be 40 mm or more. The reason is that among the concrete materials, the aggregates such as sand and gravel (stones) are about 24 mm, and assuming a maximum of 40 mm, a clearance of 40 mm is ensured. Also, during the concrete leveling operation, the size of the notch (hole) should be about 35 mm - 40 mm in diameter so that the gravel and stones of the concrete aggregates can pass through the notch (hole) of the wheel (tyre).

[0070] <Detachable auxiliary tyre> The detachable auxiliary tyres 30a and 30b are mounted during device transportation. They are for protecting the teeth (tooth shapes 27a and 27b) of the wheels 29a and 29b from chipping during transportation. Also, they have a structure that disconnects the drive during transportation and makes the wheels free.

[0071] <Lifting mechanism> The concrete leveling re - vibration device 1b has a mechanism for raising and lowering its vertical position according to the height of the concrete surface, and suppressing the large left - right inclination of the inclination of the concrete leveling re - vibration device due to external forces. When suppressing, the suppressing means provided in the concrete leveling re-vibrator 1b and the lifting mechanism includes two shock absorbers 37 for absorbing the vibration of the concrete leveling re-vibrator 1b. These two shock absorbers 37 adjust the horizontal angle of the blade 13 of the re-vibrator 2. The two shock absorbers 37 are provided on each side of both wheels, and the horizontal angle is adjusted by adjusting the thickness of the springs of the two shock absorbers 37. Thereby, even if the conveying device 2 is tilted, the blade 13 always contacts the concrete surface, so that uniform concrete leveling without unevenness can be realized.

[0072] <Traction Hook Mechanism> The traction hook mechanism 32 is for connecting the re-vibrator 2 via the connecting joint 33. This traction hook mechanism 32 adjusts the horizontal angle of the blade 13 of the re-vibrator 2. The re-vibrator 1 and the conveying device 2 are connected via the shock absorber 34, and the conveying device 2b has a structure that is not affected by re-vibration.

[0073] <Concrete Leveling Work> Hereinafter, the concrete leveling work will be described. Load the re-vibrator 1 and the conveying device 2 onto a truck or the like and transport them to the work site. When the worker arrives at the site of the concrete floor leveling work, connect the re-vibrator 1 and the conveying device 2. When the conveying device 2 is being transported, since the detachable auxiliary tires 30 are mounted on both wheels of the conveying device 2, remove the detachable auxiliary tires 30 of both wheels. This state is shown in Fig. 14.

[0074] As shown in Fig. 15, the conveying device 2 is installed on the wire mesh (steel bars) 45 at the concrete leveling work site 41, and the leveling work on the concrete surface is carried out. After the leveling work, it becomes uniform as shown in 42. Since the worker 44 operates remotely outside the work site using a remote control 43 or the like, the working environment of the worker 44 is improved, and the working efficiency can be increased. Here, in order to prevent fresh concrete from entering the motor and drive circuit of the conveying device 2 during the concrete leveling work, mechanisms such as motors and drive circuits other than the wheels 30a and 30b are sealed inside the housing 21.

[0075] Thus, according to this second embodiment, it is possible to realize a re-vibration device for concrete leveling that suppresses cracking of concrete, improves durability, and achieves labor saving and unmanned operation. In addition, by automatically traveling, cracking can be suppressed and labor can be saved.

Explanation of Signs

[0076] 1 Re-vibration device for concrete leveling 2 Conveying device for concrete leveling 3 Connecting part 4 Connecting joint 11a, 11b Vibrator 12 Re-vibration motor 13 Blade 14 Frame 15 Slider 16 Scraper 17 Lock lever 21 Housing 22 Lithium ion (Li-ion) battery 23 Compressor 24 Motor driver 25 Converter 26a, 26b Motors 27a, 27b Tooth shapes 28 Gearbox 29a, 29b Wheels 30a, 30b Detachable auxiliary tires 31, 31a, 31b Lifting mechanisms 32 Towing hook mechanism 33-link joint

Claims

1. In a re-vibration device for leveling concrete, a vibrator serving as a vibration source, a re-vibration motor that vibrates the vibrator to generate vertical vibration, a blade that propagates the vertical vibration generated by the re-vibration motor into the fresh concrete, power receiving means for receiving a motor control signal and battery power installed in the conveying device when used in connection with the conveying device, a vibration transmission bar composed of a uniform transmission control beam that is connected to the vibrator and can control the propagation by isolating the vibration from the vibrator, a lifting mechanism for raising and lowering the vertical position of the re-vibration device, A re-vibration device for leveling concrete, comprising a shock absorber provided in the lifting mechanism for absorbing the vibration of the re-vibration device and absorbing the inclination of the conveying device.

2. The re-vibration device for leveling concrete according to claim 1, wherein a plurality of vibration transmission rods are evenly distributed on the vibration transmission bar, and the vertical vibration is configured to be propagated to the blade through the vibration transmission rods.

3. A plurality of the vibrators are provided, The uniform transmission control beam includes a frame for mounting the vibrator, and is configured to transmit the vertical vibration from the vibrator to the blade through the frame, and further includes a connecting rod for connecting the vibrators. The re-vibration device for leveling concrete according to claim 1.

4. The re-vibration device for leveling concrete according to claim 1, further comprising a scraper for leveling the surface of fresh concrete and a slider for preventing the vertical vibration of the blade from being transmitted to the scraper.

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