Concrete leveling conveyor

Abstract

To provide an unmanned concrete leveling carrier device for carrying a concrete leveling re-vibration device or the like capable of improving durability by suppressing cracks of concrete while labor-saving.SOLUTION: The concrete leveling carrier device that has a connecting means to connect to a unit to be transported when towing and transporting the same when leveling concrete includes: a housing; two wheels having a tooth profile on the outer periphery, which are attached to both axles on both sides of the housing so as to travel in ready-mixed concrete; and a swivel caster attached to the bottom of the housing. The housing accommodates: two motors for driving the two wheels independently; a battery for driving the two motors; and supply means that supplies a control signal and the power from the battery to the unit to be transported when connected to the unit to be transported.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a conveying device for concrete leveling, and particularly to a conveying device for a re-vibrating device and a screed suitable for surface finishing (leveling) 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 workers hold by hand and operate, a type that is integrated with a traveling vehicle and workers perform leveling work while walking, and a type equipped with a laser screed machine.

[0003] Currently, such a concrete leveling device generally uses a gasoline engine generator 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 a worker holds a handle and performs concrete leveling work while walking. A gasoline engine generator is used as a power source, and the electric energy generated by the generator is stored in a battery to supply the 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 an operator walks on the reinforcing bars into which fresh concrete is poured to perform the leveling work, the burden on the operator is large, and it is necessary to arrange a plurality of personnel such as operators. 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 rotation speed of the engine. Since the viscosity rate cannot be lowered (liquefied) by re-vibration for cement mortar with a high mixing ratio (hard), air bleeding and water bleeding become incomplete, and for construction 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 for the cement mortar is insufficient, and since it is necessary to apply additional vibration to the insufficient part, not only is duplicate work required and the personnel burden further increases, but there are also problems such as the inability to improve costs, the 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 reinforcing bars due to the heavy weight of the device.

[0006] Also, conventionally, the problem of cracks due to insufficient compaction of the concrete floor during leveling has remained significant. There is a current situation where crack repair of 0.5 mm or more is inevitable 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. Most of it is at the time of leveling, and re-vibration has not been carried out after the water channels in the concrete have begun to form. Therefore, after the conventional compaction, the floating finish has been carried out with water channels remaining in the concrete, so the floor finish has been carried out with bubbles and voids remaining in the concrete. As a result, after completion, abrasion and impact are applied from the outside due to forklift driving and storage of heavy objects, etc. through the bubbles and voids in the concrete, and cracking occurs in a short period of time.

[0007] An object of the present invention is to solve such conventional problems, provide a concrete leveling transport device capable of transporting a re-vibration device or the like that suppresses cracking of concrete, improves durability, and aims for labor saving and unmanned operation. Another object of the present invention is to provide a transport device that aims to suppress cracking and save labor by towing and automatically running a re-vibration device or the like for removing bubbles and voids in the concrete during concrete leveling.

Means for Solving the Problems

[0008] To solve the above problems, the concrete leveling transport device of the present invention has the following configuration.

[0009] As the present invention, It is movable on the wire mesh, A concrete leveling transport device having a connecting means for connecting to a transport target device that is towed and transported during concrete leveling, comprising a housing, two wheels with a toothed outer periphery that can travel inside the fresh concrete and are attached to the axles on both sides of the housing, and a swivel caster attached to the bottom surface of the housing. Inside the housing, there are two motors for independently driving the two wheels, a battery for driving the two motors, and a supply means for supplying a control signal and battery power to the transport target device when connected to the transport target device. the wheel is located in front of the center line that bisects the front-to-back dimension of the housing, and an auxiliary wheel that follows the wheel is arranged behind the wheel. The auxiliary wheel includes an auxiliary wheel frame rotatably attached to the housing and a small wheel fixed to the auxiliary wheel frame. The small wheel has a tooth shape that alternately repeats concavities and convexities in the circumferential direction of the axis, and includes a plurality of concave curved portions, a plurality of convex portions located between the concave curved portions, and a pipe attached to the convex portions. The length of the pipe is longer than the diagonal dimension of the mesh of the wire mesh. (Corresponding to Claim 1).

[0010] In addition to the above configuration, the device to be conveyed is configured to be capable of attaching either or both of a re-vibrator and a screed (corresponding to claim 2).

[0011] In addition to the above configuration, when connected to the device to be conveyed, it has a height adjustment mechanism for adjusting the height of the device to be conveyed (corresponding to claim 3).

[0012] In addition to the above configuration, it is further provided with control means for remotely conveying or automatically conveying the connected device to be conveyed (corresponding to claim 4).

Advantages of the Invention

[0014] According to the present invention, in order to improve the process in which cracks occur, by configuring a self-propelled type vibrator that can perform re-vibration operations starting from when a water channel begins to be formed during leveling, bubbles and voids can be removed and labor can be saved by unmanned operation, thereby improving quality and saving labor. Conventional engine-type vibrating devices have differences in vibration numerical values at the center and both ends, or there are many machines that have not been digitized, and it cannot be said to be quantitatively and uniformly compacted. The model of the present invention equalizes the difference between the center and the ends and quantifies it, enabling dense compaction to be performed on the entire floor surface, and bubbles and voids can be removed evenly. A conveying device with an integrated configuration of a re-vibrator, a screed, and a conveying device for a concrete leveling surface finishing device can be realized.

Brief Description of the Drawings

[0015] 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

[0016] <First Embodiment Outline> The concrete leveling 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 as shown in FIGS. 4(a)(b) and FIGS. 3(a)(b) 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 operation 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. This arrangement configuration is adopted to improve the turning performance of the conveying device running on the wire mesh and the meshing with the wire mesh.

[0017] <First Embodiment Configuration> <First Embodiment Concrete Leveling Re-vibration Device>

[0018] As shown in FIGS. 1 and 2, the re-vibrator 1 for leveling concrete 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-vibrator 1a for leveling concrete 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 opposite directions to cancel out the front-back vibration and extract 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 mesh with the gear provided in the re-vibration motor 12 and the gear provided at the center of the vibration transmission bar 18, transmitting the driving force of the re-vibration motor 12 and being rotated in opposite directions. 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. As a result, the front-back vibration of the blade 13 is canceled 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 water drainage and air extraction during 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 has significantly improved the performance compared to the conventional re-vibrator products mainly in the vicinity of the vibration frequency of 130 Hz. As a result of comparing the re-vibrator of Embodiment 1 with the conventional product at a vibration frequency of 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-vibrator 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 (vibrator) defined by 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): Endeavor to suppress the usage time and select a vibration tool 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 shifts, it is difficult to continuously use the device.

[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 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.

[0022] <Re-vibration motor> 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 drains water and air 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 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> Sliders 15a and 15b are structured to be vertically movable freely 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 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 will uniformity not be maintained, but damage will also be caused by the vibration impact.

[0025] <Scraper> The scraper 16 operates to level the concrete surface uniformly. The scraper 16 is supported by 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 homogenize the concrete surface from which water and air have been removed by the blade 13. The scraper 16 also has the effect of eliminating the convex streaks formed by the phenomenon that the concrete is rebounded to the blade end by making the length slightly longer than the blade 13.

[0026] <Lock lever> The lock lever 17 is for connecting and towing 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 remotely transports 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) shows an enlarged view of the towing hook part, FIG. 2(b) shows an enlarged view of the slider part, and FIG. 2(c) shows 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), in practice, 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 performing the concrete leveling operation. 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 2a and the re-vibration device 1a. The lithium-ion battery 22 is a battery that can conduct a large-capacity current and can conduct 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 2a and the re-vibration device 1a 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 the motor part of the compressor 23 generates heat, 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). 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.

[0031] <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.

[0032] <Converter> The converter 25 boosts the DC voltage to generate the voltage required within the device.

[0033] <Motor> The motors 26a and 26b rotate and 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, synchronously rotate the wheels 29a and 29b, and perform straight running. Thereby, the variation in the concrete leveling operation is eliminated.

[0034] <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 (spacing) 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 (spacing of the 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.

[0035] <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, so that a desired driving force can be obtained.

[0036] <Wheel> The wheels 29a and 29b have a plate thickness (5 mm) and a round hole shape to ensure drivability in fresh concrete. It has been found through experiments that if the plate thickness is 5 mm or more, there is no strength problem. The diameter (size) of the wheels 29a and 29b is designed to be at least such that 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 surface of fresh concrete, 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 up and floated by the lifting mechanism described later, 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. This is 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). 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 large and small circular notches of the wheels 29a and 29b are not limited to circular shapes, and may be in shapes such as square, elliptical, and rhombus.

[0037] A clearance of 40 mm or more is ensured between the wheel and the main body. 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 notch (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 notch (hole) of the wheel.

[0038] <Detachable auxiliary tire> The detachable auxiliary tires 30a and 30b are attached 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 disengages the drive during transportation and makes the wheels free.

[0039] <Lifting mechanism> The leveling re-vibrator 1a for concrete has a mechanism for raising and lowering its vertical position in accordance with the height of the concrete surface, and suppresses the large left-right inclination of the leveling re-vibrator for concrete due to external forces. As shown in Figs. 21(a) and (b), this elevating mechanism is composed of a lift motor 51 and guide rails 52 and 53. The depth of fresh concrete is generally constructed on the concrete floor 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 and configured to automatically adjust the height of the re-vibrator, or it may be manually adjusted. When remote conveyance or automatic conveyance 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 elevating mechanisms 31a and 31b in Fig. 1.

[0040] The suppression means provided in the leveling re-vibrator 1a for concrete and the elevating mechanism during suppression includes two shock absorbers 37 for absorbing the vibration of the leveling re-vibrator 1a for 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. Thereby, even if the conveying device 2a is inclined, the blade 13 always contacts the concrete surface, so that uniform leveling of the concrete without unevenness can be realized.

[0041] <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 conveying device 2a are connected via a shock absorber 34, and the conveying device 2a has a structure that is not affected by re-vibration.

[0042] <Concrete leveling operation> The following describes the concrete leveling operation. Load the re-vibrator 1a and the conveyor 2a 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 1a and the conveyor 2a. When the conveyor 2a is being transported, since the detachable auxiliary tires 30 are mounted on both wheels of the conveyor 2a, remove the detachable auxiliary tires 30 of both wheels. This state is shown in FIG. 3.

[0043] 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 work 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.

[0044] 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 is omitted.

[0045] The concrete leveling operation (re-vibration tamping and leveling operation) under 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 operator 44 turns on the switch of the remote controller 43, the power supply of the controller 172 is turned on from the remote controller 43 via the wireless communication unit 171 (step 1901). The controller 172 determines whether or not the operation has stopped (step 1902). If it is not stopped, that is, in the operation mode state, first, the concrete surface is detected (step 1903). The height of the blade 13 is adjusted so that the vibration 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 by 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.

[0046] The concrete leveling operation by the manual concrete leveling re-vibration device will be described. 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 carried out. After the leveling operation, it is uniform as shown in 42. Specifically, a detachable lithium-ion battery 92 and a controller 93 are connected. 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. Even in manual re-vibration, by using the battery as the drive source and increasing the vibration frequency, the quality of the concrete surface leveling work is improved.

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

[0048] In the above first embodiment, the device to be transported was a re-vibration device, but it is not limited to this, and a device used in the surface finishing work of fresh concrete such as a laser screed may be connected and applied. Also, both a re-vibration device and a laser screed may be connected, and the surface finishing work of fresh concrete may be performed while self-traveling.

[0049] <Second Embodiment Outline> The re-vibration device 1a for concrete leveling of this second embodiment is connected to the connection joint 4 (33) of the transport device 2a via the lock lever 17 of the device itself as shown in Figs. 13(a)(b) and Fig. 12(a) to form a concrete leveling device, and is remotely controlled wirelessly by an operator using a remote controller (not shown) to streamline the re-vibration operation and leveling work of the concrete. The same reference numerals as in the first embodiment represent the same members. The differences from the first embodiment are the configuration of the re-vibration device and the provision of small wheels instead of the swivel casters 5 of the transport device.

[0050] <Second Embodiment Configuration> <Re-vibration Device for Concrete Leveling of the Second Embodiment> As shown in FIGS. 10 and 11, the re-vibrator 1a for leveling concrete includes vibrators 11a and 11b, a re-vibration motor 12, a blade 13, a frame 14, sliders 15a and 15b, a scraper 16, and a lock lever 17. Here, the vibration frequency of the re-vibrator 1a for leveling concrete is 50 - 300 Hz, and the vibration acceleration is 7G or more.

[0051] <Vibrator> The vibrators 11a and 11b are provided at two positions on the left and right. Two pendulums rotate in opposite directions to cancel out the front-back vibration and extract the up-down vibration. The vibrator 11a and the vibrator 11b are connected by a connecting rod 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 end of the connecting rod 18 to match 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 vibration of the vibrators 11a and 11b is extracted only as the up-down movement, the blade 13 is vertically vibrated, and the water drainage and air extraction in concrete construction are performed. The vibration frequency of the vibrator can vary the vibration amplitude in the range of 50 Hz to 300 Hz. This has significantly improved the performance compared to the conventional re-vibrator products mainly in the vicinity of the vibration frequency of 130 Hz. As a result of comparing the re-vibrator of Embodiment 2 with the conventional product at a vibration frequency of 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-vibrator 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 has been improved by 20 times at both ends of the blade and 4 times in the middle of the blade.

[0052] The vibration standard for the re-vibration device (vibrator) defined by the Labor Standards Act is 2.5 m / s2 or less (0.26 G). 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): Endeavor to suppress the usage time and select a vibration tool with low vibration. Measures are to be taken so that it does not exceed 5 m / s2. Therefore, if the operator of the re-vibration device does not change, continuous use of the device is difficult.

[0053] In the re-vibration device of this second embodiment, it is connected to the transport 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.

[0054] <DC motor for re-vibration> The re-vibration motor 12 is powered and driven by the lithium-ion battery 22. The re-vibration motor 12 has the role of generating re-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.

[0055] <Blade> The blade 13 generates vertical vibration by the 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 transport device described later.

[0056] <Frame> The frame 14 is configured with a length and weight such that its natural frequency matches the vibration wavelength of the vibrator. Specifically, it is preferably slightly shorter than the length of the blade 13. Vibrators 11a and 11b are attached to the frame 14, and the longitudinal vibrations generated by the vibrators can be evenly propagated in the longitudinal direction of the blade 13.

[0057] <Slider> The slider 15 has a structure that can move freely up and down, and is structured as a vibration isolation mechanism that does not transmit the longitudinal vibrations from the re-vibration device 2a 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 vibrations are transmitted to the scraper 16, not only will uniformity not be maintained, but damage will also be caused by the vibration impact.

[0058] <Scraper> The scraper 16 operates to evenly level the concrete surface. The scraper 16 is supported by 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 homogenize the concrete surface from which water and air have been removed by the blade 13. The scraper 16 also has the effect of eliminating the convex streaks formed by the phenomenon of the concrete being repelled to the blade ends by making the length slightly longer than the blade 13.

[0059] <Lock lever> The lock lever 17 is for connecting and towing the re-vibration device 1a to the concrete leveling transport device 1a. It is attached to the connection 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 2b remotely transports the concrete leveling re-vibration device 1a by an operator (not shown).

[0060] <Second Embodiment: Concrete Leveling Conveyor> [[]]As shown in FIGS. 10 and 11, the concrete leveling conveyor 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 upper and lower parts of the concrete leveling re-vibrator 1b, a towing hook mechanism 32, and a connecting joint 33. Partial enlarged views of FIG. 10 are shown in FIGS. 12(a), (b), and (c). FIG. 12(a) is a partial enlarged view of the towing hook, FIG. 12(b) is a partial enlarged view of the slider, and FIG. 12(c) is a partial enlarged view of the re-vibration motor. [[]]

[0061] [[]] [[]]<Housing (Main Body)>[[]] [[]]The housing (main body) 21 houses drive control mechanisms such as the motor, converter, motor driver, gearbox, and compressor of the conveyor. As shown in FIGS. 14(a) and (b), in practice, a cover is attached to the housing to form a sealed structure. This is to prevent fresh concrete from entering the housing (main body) during the concrete leveling operation. [[]]

[0062] [[]] [[]]<Lithium-Ion Battery>[[]] [[]]The lithium-ion battery 22 supplies power to the motors of the conveyor 2b and the re-vibrator 1b. The lithium-ion battery 22 is a battery that can conduct a large-capacity current and can conduct 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 2b and the re-vibrator 1b are not limited to this, and solar power generation systems, hydrogen fuel batteries, etc. can also be used. [[]]

[0063] [[]] [[]]<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.

[0064] <Motor driver> The motor driver 24 is composed of a drive circuit board that drives the 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.

[0065] <Converter> The converter 25 generates the required voltage within the device from the DC voltage.

[0066] <Motor> The motors 26a and 26b rotationally drive the two-wheel toothed wheels 29a and 29b and supply the driving force for the conveyance of the re-vibration device 1b. 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. 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 operation is eliminated.

[0067] <Tooth shape (tooth profile shape)> The tooth shapes 27a and 27b are configured such that the outer periphery that bites into the wire mesh (steel bars) and travels has a tooth shape. This tooth shape can be appropriately changed according to the pitch (interval) of the steel bars. For example, when the pitch of the steel bars is short, the tooth peaks are made smaller, and when the pitch of the steel bars is large, the shape of the tooth peaks is made larger.

[0068] <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 the 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.

[0069] <Wheel> The wheels (tires) 29a and 29b have a thickness (5 mm) and a round hole shape to ensure drivability in fresh concrete. Through experiments, it was found that there is no strength problem as long as the thickness is 5 mm or more. 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. At this time, the weight of the conveying device is about 85 Kg. The wheels 29a and 29b are provided with large and small circular notches (holes or openings). When leveling the fresh concrete, this can reduce the resistance of the conveying device traveling in the fresh concrete and improve 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 square, elliptical, diamond-shaped, etc.

[0070] The clearance between the wheel (tire) and the body is ensured to be 40 mm or more. The reason is that among the concrete materials, the aggregates of 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 to 40 mm in diameter so that the gravel and stones of the concrete aggregates can pass through the notch (hole) of the wheel (tire).

[0071] <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.

[0072] <Lifting mechanism> It has a mechanism to raise and lower the vertical position of the re-vibrator 1b for concrete leveling according to the height of the concrete surface, and suppresses the large left and right inclination of the re-vibrator for concrete leveling due to external forces. When suppressing, the suppressing means provided in the concrete leveling re-vibrating device 1b and the lifting mechanism includes two shock absorbers 37 for absorbing the vibration of the concrete leveling re-vibrating device 1b. These two shock absorbers 37 adjust the horizontal angle of the blade 13 of the re-vibrating device 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.

[0073] <Traction Hook Mechanism> The traction hook mechanism 32 is for connecting the re-vibrating device 2b via the connecting joint 33. This traction hook mechanism 32 adjusts the horizontal angle of the blade 13 of the re-vibrating device 2b. The re-vibrating device 1b and the conveying device 2b are connected via the shock absorber 34, and the conveying device 2b has a structure that is not affected by re-vibration.

[0074] <Concrete Leveling Work> Hereinafter, the concrete leveling work will be described. Load the re-vibrating device 1b and the conveying device 2b 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-vibrating device 1b and the conveying device 2b. When the conveying device 2b is being transported, since the detachable auxiliary tires 30 are mounted on both wheels of the conveying device 2b, remove the detachable auxiliary tires 30 from both wheels. This state is shown in FIG. 14.

[0075] As shown in Fig. 15, the conveying device 2 is installed on the wire mesh (reinforcing bar) 45 at the concrete leveling work site 41, and the leveling work on the concrete surface is carried out. After the leveling work, it is uniform as shown in 42. Since the worker 44 remotely operates 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 the fresh concrete from entering the motor and drive circuit of the conveying device 2 during the concrete leveling work, the mechanisms such as the motor and drive circuit other than the wheels 30a and 30b are sealed in the housing 21.

[0076] In this way, according to the second embodiment, it is possible to realize an integrated conveying device by connecting a re-vibrating device for concrete leveling that suppresses concrete cracking, improves durability, and aims at labor saving and unmanned operation. In addition, by automatically traveling, it is possible to suppress cracking and save labor.

[0077] In the above second embodiment, the device to be conveyed is a re-vibrating device, but it is not limited thereto, and a device used in the surface finishing work of fresh concrete such as a laser screed may be connected and applied. Further, both a re-vibrating device and a laser screed or the like may be connected, and the surface finishing work of fresh concrete may be performed while self-traveling.

[0078] <Third Embodiment> Figs. 22 to 27 show a concrete leveling device configured by connecting a re-vibrating device 2c for concrete leveling according to the third embodiment and a conveying device 1c. The basic configuration of the concrete leveling device according to the third embodiment is the same as the basic configurations of the first and second embodiments, and the same reference numerals in the drawings and the specification represent the same constituent members.

[0079] Referring to FIG. 22, in the re-vibration device 1c according to the present embodiment, the drive wheels (wheels) 29a and 29b are positioned further forward with respect to the main body 21 than in the first and second embodiments. Specifically, by the rotation axes 29c of the drive wheels 29a and 29b being located on the front side of the virtual center line P-P that bisects the front-rear dimension of the main body 21, compared to the case where they are located on the virtual center line P-P or on the rear side of the virtual center line P-P, the center of gravity of the main body 21 is located near the virtual center line P-P and the weight balance is achieved, resulting in excellent stability and drivability.

[0080] Referring to FIGS. 23 and 24, in the present embodiment, the small auxiliary wheels 60 are located behind the drive wheels 29a and 29b, and the rotation axis 62a thereof is located behind the virtual center line P-P. The auxiliary wheels 60 include an auxiliary wheel frame 61 attached to the bearing (bearing) 21c of the main body 21, and a small wheel 62 fixed to the auxiliary wheel frame 61. The auxiliary wheel frame 61 has a base portion 61a rotatably fixed to the main body 21, and support portions 61b extending downward from both sides of the base portion 61a.

[0081] The small wheel 62 has a punched-out shape with a plurality of circular through-holes similar to the drive wheels 29a and 29b, and a plurality of plate-like members with a smaller diameter dimension than the drive wheels 29a and 29b are arranged in the transverse direction perpendicular to the front-rear direction and integrally formed, and its rotation axis 62a is attached to the support portion 61b of the auxiliary wheel frame 61.

[0082] The small wheel 62 has a tooth-shaped shape with alternating concavities and convexities in the circumferential direction around the axis, and has a plurality of concave curved portions 63 and convex portions 64 located between the concave curved portions 63. A pipe 65 extending in the transverse direction is attached to each convex portion 64. The pipe 65 is non-rotatably attached to the small wheel 62 so as not to inhibit the rotation of the small wheel 62 itself.

[0083] The pipe 65 has a core-sheath structure with a metal core and a sheath made of a flexible elastic material such as synthetic rubber or silicone rubber. If the entire pipe 65 is formed of metal, there is a risk of damaging the wire mesh 45 on the concrete floor surface during work. However, since the sheath is formed of a flexible elastic material, it will not be damaged even if it touches the wire mesh 45.

[0084] The pipe 65 is held in a state of being clamped by the small wheels 62. On the outer surface side of the convex portions 64 to which both ends of the pipe 65 are attached, there are no fixing tools such as nuts or screws, and there are no protrusions protruding outward in the transverse direction from the plate-like member. That is, both side surfaces 62a, 62b of the small wheels 62 have a flat shape.

[0085] Referring to FIGS. 25 and 26, according to the re-vibration device 1c according to the second embodiment, since the auxiliary wheels 60 move and rotate so as to follow the driving of the driving wheels 29a, 29b located on the front side of the main body, smooth operation of the re-vibration device 1 can be realized. For example, when the re-vibration device 1 changes its path in the direction opposite to the traveling direction, the auxiliary wheels 60 rotate following the driving wheels 29a, 29b, so that smooth movement can be realized.

[0086] Also, even when the driving wheels 29a, 29b fall into the meshes of the wire mesh 45, since the length dimension of the concave curved portion 63 of the small wheel 62 is larger than the diameter dimension of the wire, and the pipe 65 is designed to be longer than the diagonal dimension which is the largest dimension among the meshes of the wire mesh 45, the auxiliary wheels 60 are always positioned on the wire mesh 45 and will not fall in by themselves.

[0087] In addition, since the convex portion 64 of the small frame 62 has a convex curved shape, it will not damage the wire mesh 45 even if it touches it. Further, if a fixture or the like for fixing the pipe 65 protrudes from the outer surfaces of both side surfaces 62a and 62b of the small frame 62, there is a risk that it will catch on the wire mesh 45 during traveling. However, as described above, since there are no protrusions on the outer surfaces of both side surfaces 62a and 62b of the small frame 62 and it has a flat shape, such a situation will not occur.

[0088] Referring to FIGS. 27(a) and (b), the blade 13 of the re-vibration device 1c has a hollow portion 70 extending in its longitudinal direction (transverse direction). By having the hollow portion 70 in the blade 13, the weight reduction of the entire re-vibration device 1c can be achieved. Further, the bottom surface of the blade 13 has a rear inclined portion 13 that extends obliquely upward. Although providing the hollow portion 70 in the blade 13 may reduce the vibration pressure due to weight reduction, by providing the rear inclined portion 71 while maintaining the balance due to the shape and reducing the contact area with the concrete floor surface, the required vibration can be applied.

Explanation of Reference Numerals

[0089] 1a, 1b, 1c Re-vibration device for leveling concrete 2a, 2b, 2c Conveying device for leveling concrete 3 Connecting portion 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 mechanism 32 Towing hook mechanism 33 Connecting joint

Claims

1. A concrete leveling transport device that is movable on a wire mesh and has a connecting means for connecting to a transport target device that is towed and transported during concrete leveling, a housing, two wheels with a toothed outer circumference that can run inside fresh concrete and are attached to axles on both sides of the housing, and a swivel caster attached to the bottom surface of the housing, inside the housing, two motors that independently drive the two wheels, a battery that drives the two motors, and supply means for supplying a control signal and battery power to the transport target device when connected to the transport target device, the wheels are located in front of the center line that bisects the front-rear dimension of the housing, and behind the wheels, auxiliary wheels that follow the wheels are arranged, the auxiliary wheels include an auxiliary wheel frame rotatably attached to the housing and a small wheel fixed to the auxiliary wheel frame, the small wheel has a toothed shape with alternating convex and concave portions in the circumferential direction around the axis, a plurality of concave curved portions, a plurality of convex portions located between the concave curved portions, and a pipe attached to the convex portions, the length of the pipe is longer than the diagonal dimension of the mesh of the wire mesh, characterized in that it is a concrete leveling transport device.

2. The concrete leveling transport device according to claim 1, wherein the transport target device is compatible with the attachment of either a re-vibrator or a screed, or both.

3. The concrete leveling transport device according to claim 1 or claim 2, having a height adjustment mechanism for adjusting the height of the transport target device when connected to the transport target device.

4. The concrete leveling transfer device according to claim 1 or claim 2, further comprising control means for remotely transferring or automatically transferring the device to be transferred that is further connected.

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