Reinforcement bar cargo transport system and reinforcement bar cargo transport trolley

Abstract

To provide a cargo transport system and a cargo transport trolley on reinforcing bars that can transport cargo stably by preventing wheels from riding up or derailing, even if there are reinforcement errors in the reinforcing bars used as rails and / or if the reinforcing bars are double-layered as lap splices. [Solution] The rebar transport trolley 100 is composed of a wheel unit 110, a connecting unit 120, and a load handling unit 130, and each wheel 111 is equipped with a short cylindrical tread portion 111r and tapered surface portions 111p that widen in diameter and are connected to the left and right sides of the tread portion, and is configured to slide freely from side to side along a pair of axles 112, and is equipped with an automatic wheel position adjustment mechanism that slides from side to side along the axle within the travel frame 113 in response to the force that the tapered surface receives from the vertical rebar LR that is currently being driven on.

Description

[[Technical Field]]

[0001] The present invention relates to a traveling body that travels using vertical bars constituting a reinforcing bar grid as rails to be used for work at a construction site, and particularly relates to an on-reinforcing bar cargo carrying system and an on-reinforcing bar cargo carrying cart that carries and transports cargo. [[Background Art]]

[0002] Conventionally, as a traveling body that travels using vertical bars constituting a reinforcing bar grid as rails to be used for work at a construction site, for example, there is known a traveling body that includes a fixed V-tapered wheel and an adjustment wheel, and changes and fixes the mounting position of the adjustment wheel according to a preset interval between vertical bars for use (see Patent Document 1). [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Application Publication No. 2019-039174 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] However, the traveling body described in Patent Document 1 changes and fixes the mounting position of the adjustment wheel according to a preset interval between vertical bars. Therefore, when applied to the purpose of placing and transporting cargo on the traveling body at a construction site, at a portion where the arrangement interval of the vertical bars serving as rails deviates from a preset value, resulting in a reinforcement arrangement error, and / or at a portion where double reinforcement is arranged as a lap joint, there has been a problem that wheels ride up on the vertical bars, the traveling body tilts, the cargo being transported falls, and / or the wheels derail from the vertical bars serving as rails, stopping the transporting work.

[0005] Therefore, the present invention solves the problems of the prior art described above, and that is, the object of the present invention is to provide a cargo transport system and a cargo transport trolley on reinforcing bars that can transport cargo stably by preventing wheels from riding up or coming off, even if there are reinforcement errors in the reinforcing bars used as rails and / or if the reinforcing bars are doubled as lap joints. [Means for solving the problem]

[0006] The invention according to claim 1 is a rebar cargo transport system for transporting cargo on multiple rebar cargo transport trolleys that travel in the front-rear direction using the vertical bars of a rebar grid, which consists of a plurality of horizontal bars laid parallel to each other along the left-right direction of a construction surface and a plurality of vertical bars laid parallel to each other along the front-rear direction on the horizontal bars as rails, wherein each rebar cargo transport trolley is composed of a wheel unit consisting of a front wheel and a rear wheel that travel on one common vertical bar among the plurality of vertical bars, a pair of front and rear axles that pivotally fix the front wheel and rear wheel, respectively, and a running frame that fixes both the left and right ends of the pair of front and rear axles, respectively, and a connecting unit that connects and fixes the plurality of wheel units to each other in parallel at predetermined intervals from left to right, The aforementioned problems are solved by providing the front and rear wheels, each equipped with a short cylindrical tread portion and tapered surfaces that widen in diameter and are connected to the left and right sides of the tread portion, and configured to slide freely from side to side along the pair of axles, and by providing an automatic wheel position adjustment mechanism that slides from side to side along the axles within the running frame in response to the force that the tapered surfaces receive from the longitudinal bars that are currently running.

[0007] The invention according to claim 2 is a rebar cargo transport trolley that constitutes a rebar cargo transport system that transports cargo loaded on a rebar grid consisting of a plurality of horizontal bars laid parallel to each other along the left-right direction of a construction surface and a plurality of vertical bars laid parallel to each other along the front-rear direction on the horizontal bars, and the trolley that travels on the vertical bars of the rebar grid as rails, and comprises a wheel unit consisting of a front wheel and a rear wheel that travels on one common vertical bar among the plurality of vertical bars, a pair of front and rear axles that pivotally fix the front wheel and rear wheel, respectively, and a travel frame that fixes both the left and right ends of the pair of front and rear axles, respectively, and a plurality of the trolley The vehicle is composed of a connecting unit that arranges wheel units in parallel on the left and right and connects and fixes them to each other, and a cargo handling unit provided on top of the connecting unit that moves the loaded cargo in the left and right direction. The front and rear wheels are each equipped with a short cylindrical tread and tapered surfaces that widen in diameter and are connected to the left and right of the tread, respectively, and are configured to slide freely from side to side along a pair of axles. The vehicle is equipped with an automatic wheel position adjustment mechanism that slides from side to side along the axles within the running frame in response to the force that the tapered surfaces receive from the longitudinal grooves that are currently being driven on, thereby further solving the aforementioned problems.

[0008] The invention according to claim 3 further solves the aforementioned problems by comprising, in addition to the configuration of the invention according to claim 2, a plurality of transport rollers pivotally attached to a plurality of roller shafts extending in the front-rear direction and arranged at predetermined intervals to the left and right along the connecting unit, a pair of transport guides extending to the left and right and positioned opposite to the front and rear of the transport rollers along the connecting unit, and a cargo loading platform that is slidable and detachably mounted on the transport rollers to the left and right. [Effects of the Invention]

[0009] According to the rebar-top cargo transport system of the invention described in claim 1, cargo is loaded onto multiple rebar-top transport trolleys that run on rails made up of a rebar grid consisting of multiple horizontal bars laid parallel to each other along the left-right direction of the construction surface and multiple vertical bars laid parallel to each other along the front-rear direction on these horizontal bars. Since multiple rebar-top transport trolleys are arranged and used for transport, the system can be configured by arranging multiple rebar-top transport trolleys at any position according to the dimensions and weight of the cargo. Furthermore, the system achieves effects unique to the present invention due to the following unique configuration of the present invention.

[0010] In other words, the rebar transport trolley is composed of a wheel unit consisting of front and rear wheels that travel on a common vertical rebar among several vertical rebars, a pair of front and rear axles that pivotally secure the front and rear wheels, and a travel frame that fixes both the left and right ends of the pair of front and rear axles, and a connecting unit that connects and fixes multiple wheel units to each other in parallel at predetermined intervals from left to right. As a result, multiple wheel units are connected and fixed to each other by the connecting unit, and the front and rear wheels of each wheel unit travel on a common vertical rebar, so that the loaded cargo can be transported stably.

[0011] Furthermore, the front and rear wheels are each equipped with a short cylindrical tread and tapered surfaces that widen and connect to the left and right of the tread, respectively, and are configured to slide freely from side to side along a pair of axles. An automatic wheel position adjustment mechanism is provided that allows the tapered surfaces to slide from side to side along the axle within the running frame in response to the force received by the tapered surfaces from the longitudinal reinforcement bars that the wheels are currently running on. As a result, in areas where the spacing of the longitudinal reinforcement bars that form the rails deviates from a preset value, causing reinforcement errors, and / or in areas where reinforcement bars are doubled as lap joints, even if the tapered sections ride up onto the longitudinal reinforcement bars, the horizontal component of the force received by the tapered sections of the front and rear wheels from the longitudinal reinforcement bars causes the wheels to slide laterally from side to side along the axle, following the position of the longitudinal reinforcement bars. This automatically moves the tread to a position where the wheels can run normally on the longitudinal reinforcement bars, preventing the front and rear wheels from derailing from the longitudinal reinforcement bars that they are currently running on, and minimizing vertical movement and tilting of the cargo platform to prevent cargo collapse.

[0012] The rebar-top cargo transport trolley of the invention according to claim 2 of this invention provides a rebar-top cargo transport system in which cargo is loaded onto multiple rebar-top transport trolleys that run on rails made up of a rebar grid consisting of a plurality of horizontal bars laid parallel to each other along the left-right direction of the construction surface and a plurality of vertical bars laid parallel to each other along the front-rear direction on these horizontal bars. Because it is used for transport when arranged together with other rebar-top transport trolleys, the system can be configured by arranging them at any position together with other rebar-top transport trolleys according to the dimensions and weight of the cargo, and the following configuration unique to the present invention provides effects unique to the present invention.

[0013] In other words, the vehicle is composed of a wheel unit consisting of front and rear wheels that travel on a common vertical groove among several vertical grooves, a pair of front and rear axles that pivotally secure the front and rear wheels, and a running frame that fixes both the left and right ends of the pair of front and rear axles; a connecting unit that connects and fixes multiple wheel units in parallel from left to right; and a cargo handling unit provided on top of the connecting unit that moves the loaded cargo in the left and right directions. As a result, multiple wheel units are connected and fixed to each other by the connecting unit, and the front and rear wheels of each wheel unit travel on a common vertical groove, so that the loaded cargo can be transported stably in the front and rear directions.

[0014] Furthermore, since the cargo handling unit, which is loaded with cargo on top of the connecting unit, moves from side to side, cargo can be handled from side to side on the transport trolley.

[0015] Furthermore, the front and rear wheels are each equipped with a short cylindrical tread and tapered surfaces that widen and connect to the left and right of the tread, respectively, and are configured to slide freely from side to side along a pair of axles. An automatic wheel position adjustment mechanism is provided that allows the tapered surfaces to slide from side to side within the running frame in response to the force received by the tapered surfaces from the longitudinal reinforcement bars that the wheels are currently running on. As a result, in areas where the spacing of the longitudinal reinforcement bars that form the rails deviates from a preset value, causing reinforcement errors, and / or in areas where reinforcement is doubled as a lap joint, even if the tapered sections ride up onto the longitudinal reinforcement bars, the horizontal component of the force received by the tapered sections of the front and rear wheels from the longitudinal reinforcement bars causes the wheels to slide from side to side along the axles, following the position of the longitudinal reinforcement bars and automatically moving to a position where the tread surfaces can run normally on the longitudinal reinforcement bars. This prevents the front and rear wheels from derailing from the longitudinal reinforcement bars that they are currently running on, and minimizes vertical movement and lateral tilting of the cargo platform, thereby preventing cargo collapse.

[0016] According to the rebar cargo transport trolley of the invention of claim 3, in addition to the effects of the invention of claim 2, the cargo handling unit is composed of a plurality of transport rollers pivotably attached to a plurality of roller shafts extending in the front-rear direction and arranged at predetermined intervals to the left and right along the connecting unit, a pair of transport guides extending to the left and right and positioned opposite to the front and rear of the transport rollers along the connecting unit, and a cargo platform that is slidably mounted on the transport rollers. Therefore, in areas where the spacing of the longitudinal reinforcing bars that serve as rails deviates from a predetermined value and a reinforcing error occurs, and / or in areas where the reinforcing bars are doubled as overlap joints, even if the tapered portion of the front or rear wheel rides up on the longitudinal reinforcing bars and the traveling frame and connecting unit vibrate from side to side, the cargo platform on which the cargo is loaded swings from side to side in the opposite direction to the vibration of the traveling frame and connecting unit, accompanied by the rolling of the transport rollers, to cancel out the vibration and maintain the inertial motion of the cargo platform. This minimizes the lateral movement of the cargo platform and prevents cargo collapse even when transporting cargo with a circular cross-section, such as reinforcing bars.

[0017] Further, the cargo handling unit comprises: a plurality of conveying rollers each rotatably pivoted to a plurality of roller shafts that are arranged at predetermined intervals in the left-right direction along the connection unit and extend in the front-rear direction; a pair of conveying guides that are disposed opposite to each other on the front and rear sides of the conveying rollers along the connection unit and extend in the left-right direction; and a cargo placing table that is placed on the conveying rollers between the pair of conveying guides so as to be slidable in the left-right direction and attachable and detachable. With this configuration, when the cargo placing table slides laterally on the conveying rollers along with the rolling of the conveying rollers, the end portion on the side detached from the conveying rollers falls onto the reinforcing bar grid to form an inclined surface on the cargo placing table. Therefore, when the cargo arrives at the destination for cargo transportation, only pushing the cargo placing table laterally causes the cargo to slide laterally together with the cargo placing table, and slide down along the inclined surface formed by the cargo placing table to the reinforcing bar grid, so that the unloading work can be easily completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] [Figure 1] A schematic diagram showing a use mode of the cargo transportation system on reinforcing bars according to the present invention. [Figure 2] A schematic side view of the cargo transportation system on reinforcing bars according to the present invention. [Figure 3] A schematic front view of the cargo transportation cart on reinforcing bars according to the present invention. [Figure 4] A schematic plan view showing a state where the cargo transportation cart on reinforcing bars according to the present invention travels on vertical bars having reinforcement arrangement errors. [Figure 5] A schematic explanatory view showing a process of adjusting the position of wheels by the automatic wheel position adjustment mechanism in the cargo transportation cart on reinforcing bars according to the present invention. [Figure 6] A schematic diagram showing a state of unloading work in the cargo transportation cart on reinforcing bars according to the present invention. MODE FOR CARRYING OUT THE INVENTION

[0019] The present invention provides a system for transporting cargo on multiple rebar-mounted cargo transport trolleys that travel in the longitudinal direction using the longitudinal rebars of a rebar grid, which consists of multiple horizontal rebars laid parallel to each other along the left-right direction of a construction surface and multiple vertical rebars laid parallel to each other along the front-rear direction on these horizontal rebars as rails. Each rebar-mounted cargo transport trolley consists of a wheel unit comprising a front wheel and a rear wheel that travel on one common vertical rebar among the multiple vertical rebars, a pair of front and rear axles that pivotally secure the front and rear wheels, respectively, and a running frame that fixes both the left and right ends of the pair of front and rear axles, respectively, and a connecting unit that connects and fixes multiple wheel units in parallel from left to right. The vehicle is composed of a front wheel and a rear wheel, each having a short cylindrical tread and tapered surfaces that widen in diameter and are connected to the left and right sides of the tread, and is configured to slide freely from side to side along a pair of axles, and is equipped with an automatic wheel position adjustment mechanism that slides from side to side along the axles within the running frame in response to the force that the tapered surfaces receive from the longitudinal reinforcement bars that are currently running, and can transport cargo stably by preventing the wheels from riding up or coming off, even if there are reinforcement errors in the reinforcement bars that form the rails and / or if they are double-reinforced as lap joints.

[0020] Further, the present invention constitutes an on-rebar cargo transport system that transports loaded cargo by traveling, using the vertical bars of a reinforcing bar grid as rails, said reinforcing bar grid being composed of a plurality of horizontal bars laid mutually parallel along the left-right direction of a construction surface and a plurality of vertical bars laid mutually parallel along the front-rear direction on said horizontal bars. The on-rebar cargo transport system is composed of: a wheel unit comprising a front wheel and a rear wheel that travel on a common one of the plurality of vertical bars, a pair of front and rear axles that respectively pivotally support the front wheel and the rear wheel rotatably, and a traveling frame that fixes the left and right ends of the pair of front and rear axles respectively; a connection unit that connects and fixes the plurality of wheel units in parallel in the left-right direction; and a cargo handling unit provided on an upper portion of the connection unit for moving loaded cargo in the left-right direction. The front wheel and the rear wheel each include a short-cylindrical tread surface portion and tapered surface portions that are continuously connected to the left and right sides of the tread surface portion with an increased diameter, and are configured to be slidable left and right along the pair of axles. The system is provided with an automatic wheel position adjustment mechanism that slides left and right along the axles within the traveling frame according to the force received by the tapered surfaces from the vertical bar on which the vehicle is currently traveling, so that even if there is a bar arrangement error in the reinforcing bar serving as the rail and / or the reinforcing bars are doubly arranged as a lap joint, any specific embodiment is acceptable as long as it can prevent wheels from riding up or derailing and stably transport cargo.

[0021] For example, in the traveling frame of the present invention, the slidable distance over which the wheels slide left and right is preferably set such that the on-rebar cargo transport carriage according to the present invention does not derail at the construction site, based on the fact that the error of reinforcing bar arrangement intervals, that is, the bar arrangement error is assumed to be ±20 millimeters. If the slidable distance is less than 15 millimeters, there is a risk of derailing due to inability to accommodate bar arrangement errors, and if the slidable distance is more than 50 millimeters, the lateral sliding amount of the wheels is too large, which may cause unstable traveling. Therefore, the slidable distance is preferably set to 15 millimeters or more and 50 millimeters or less.

[0022] If the fixing interval between traveling frames is set to an integer multiple of the reinforcing bar arrangement interval, as long as the vertical bars are arranged at the correct bar arrangement interval, the wheels can each be positioned at the center of the traveling frame and travel stably on the vertical bars.

[0023] The fixing interval between the running frames can be set by selecting from 2, 3, 4, 5, or 6 times the vertical reinforcement spacing specified in the specifications. Setting it to the distance between adjacent vertical reinforcements (1x the reinforcement spacing) results in a narrow gap between the wheels, making the rebar-carrying trolley unstable. Setting it to more than 6 times the vertical reinforcement spacing results in longer connecting units that link and fix the running frames together, which may cause bending and twisting in the rebar-carrying trolley, potentially leading to unstable movement.

[0024] Furthermore, the configuration of the cargo loading platform for placing cargo is not limited to being positioned only between a pair of transport guides, as long as it is configured to slide freely on the transport rollers. By further placing and fixing a wider plate-shaped member on top of a narrow cargo loading platform positioned between a pair of transport guides, the overall cross-sectional shape of the cargo loading platform can be approximately T-shaped, which increases the contact surface with the cargo and allows for more stable loading and transport.

[0025] In this case, when a rebar-mounted cargo transport system is constructed using multiple rebar-mounted cargo transport trolleys, the cross-sectional shape of the cargo platform can be configured to be approximately π-shaped or similar, depending on the number of rebar-mounted cargo transport trolleys.

[0026] Furthermore, in constructing a cargo transport system on rebars equivalent to the cargo transport system on rebars of the present invention, there may be various variations in the basic configuration and arrangement of the cargo transport trolley on rebars.

[0027] For example, when constructing a rebar-mounted cargo transport trolley, the axles that pivot to the left and right pairs of front wheels that run on the first and second vertical reinforcing bars are fixed to horizontally elongated running frames to form the front wheel units. Similarly, the axles that pivot to the left and right pairs of rear wheels that run on the first and second vertical reinforcing bars are fixed to horizontally elongated running frames to form the rear wheel units. These front wheel units and rear wheel units are then arranged front to back and fixed together with a connecting unit to form a single rebar-mounted cargo transport trolley.

[0028] Furthermore, by arranging two of these rebar-top cargo transport trolleys side by side so that each wheel travels along a total of four vertical rebars, and by loading long cargo onto these multiple rebar-top cargo transport trolleys in a horizontal manner, a rebar-top cargo transport system can be configured to transport the cargo back and forth.

[0029] Regardless of the configuration of the rebar cargo transport trolleys used, the number of trolleys arranged in parallel, either front-to-back or side-to-side, is not limited to two. Depending on the length and weight of the long cargo, the number of rebar cargo transport trolleys required can be arranged in parallel to flexibly configure the rebar cargo transport system. [Examples]

[0030] Hereinafter, an embodiment of the present invention, a rebar-mounted cargo transport system 10, will be described with reference to Figures 1 to 6. Here, Figure 1 is a schematic diagram showing how the rebar cargo transport system according to the present invention is used; Figure 2 is a schematic side view of the rebar cargo transport system according to the present invention; Figure 3 is a schematic front view of the rebar cargo transport trolley according to the present invention; Figure 4 is a schematic plan view showing how the rebar cargo transport trolley according to the present invention travels on vertical rebars with rebar placement errors; Figure 5 is a schematic explanatory diagram showing the process by which the rebar cargo transport trolley according to the present invention adjusts the position of the wheels using an automatic wheel position adjustment mechanism; and Figure 6 is a schematic diagram showing the unloading operation of the rebar cargo transport trolley according to the present invention.

[0031] As shown in Figures 1 and 2, the rebar-top cargo transport system 10 transports long cargo TR by moving the vertical rebars LR of the rebar grid RG, which consists of multiple horizontal rebars HR laid parallel to each other along the left-right direction of the construction surface G and multiple vertical rebars LR laid parallel to each other along the front-back direction on these horizontal rebars HR, using the vertical rebars LR as rails and moving in the front-back direction by the manual power of the worker P.

[0032] First, the configuration of the rebar cargo transport system 10 according to this embodiment will be described. As shown in Figures 1 and 2, the rebar cargo transport system 10 consists of a rebar cargo transport trolley 100 and a rebar cargo transport trolley 100', and is used by placing long cargo TRs such as large-diameter reinforcing bars between the rebar cargo transport trolley 100 and the rebar cargo transport trolley 100'.

[0033] In this embodiment, the rebar cargo transport system 10 is composed of two rebar cargo transport trolleys, 100 and 100', but the number of trolleys can be freely set according to the weight, dimensions, quantity, etc., of the long cargo TR.

[0034] Since the rebar-mounted cargo transport cart 100' has the same configuration as the rebar-mounted cargo transport cart 100, corresponding components in each figure will be indicated with the same number followed by a dash, and from now on, the rebar-mounted cargo transport cart 100 will be used as a representative example in the explanation.

[0035] The rebar-mounted cargo transport trolley 100 consists of a wheel unit 110, a connecting unit 120 in which multiple wheel units 110 are arranged in parallel on the left and right and connected to each other, and a cargo handling unit 130 provided on top of the connecting unit 120 for moving the mounted long cargo TR in the left and right directions.

[0036] As shown in Figures 2 to 4, the wheel unit 110 consists of a running frame 113 that fixes the left and right ends of a pair of front and rear axles 112 that extend in the left and right directions, and wheels 111 that serve as front and rear wheels, pivotally mounted by the pair of axles 112 and running on a common vertical bar LR among a plurality of vertical bars LR.

[0037] As shown in Figures 3 and 4, the wheel 111 is equipped with a short cylindrical tread portion 111r and tapered surface portions 111p that widen in diameter and are connected to the left and right sides of the tread portion 111r, and is configured to slide freely from side to side along a pair of axles 112.

[0038] The sliding distance over which the wheel 111 can slide left and right along the axle 112 within the running frame 113 can be expressed as "FW-WW" using the inner frame dimension FW of the running frame 113 and the wheel width WW of the wheel 111, as shown in Figure 4.

[0039] In this embodiment, FW-WW is set to 35 (millimeters).

[0040] As shown in Figures 2 to 4, the connecting unit 120 extends in the left-right direction in an overall U-shape consisting of a connecting base 121, a connecting upright portion 122, and a connecting top portion 123.

[0041] The connecting unit 120 connects and fixes to each other multiple running frames 113, which are arranged in parallel on the left and right at predetermined intervals, at a connecting base 121 at a position midway between the wheels 111 that make up a pair of front and rear wheels.

[0042] The fixing interval of the running frames 113 by the connecting unit 120 is set such that when the wheels 111 are positioned in the center of the left and right sides of each running frame 113, the distance between the wheels 111 is three times the reinforcement interval RS of the vertical reinforcement LR.

[0043] With this setting, as long as the vertical reinforcement bars LR are arranged at the correct reinforcement interval RS, the wheels 111 will each be positioned in the center of the running frame 113 and will stably travel along the vertical reinforcement bars LR.

[0044] The cargo handling unit 130 consists of a plurality of roller shafts 132 arranged at predetermined intervals on the left and right sides along the connecting unit 120 and extending in the front-rear direction, a plurality of transport rollers 131 pivotally attached to each of the roller shafts 132, a pair of transport guides 133 arranged opposite to the front and rear of the transport rollers 131 along the connecting unit 120 and extending on the left and right, and a cargo loading platform 134 that is mounted on the transport rollers 131 and slidably from side to side between the pair of transport guides 133.

[0045] Multiple roller shafts 132 are fixed at their front and rear ends to a pair of connecting upright sections 122.

[0046] The transport guide 133 consists of a guide base 133a positioned and fixed on the connecting top 123 along the connecting unit 120, guide wall portions 133b that face each other and restrict the forward and backward movement of the cargo loading platform 134, and a guide guide portion 133c that guides the position when inserting the cargo loading platform 134 between the opposing guide wall portions 133b.

[0047] The cargo loading platform 134 has a long, plate-like structure and is used to load long cargo such as large-diameter reinforcing bars when transporting them. When handling cargo, it is moved from side to side on top of the connecting unit 120 for use in operations.

[0048] As described above, since the cargo platform 134 is mounted on the transport roller 131 so as to be able to slide left and right, even if the tapered surface portion 111p of the wheel 111 rides up on the vertical reinforcement LR in a section where the spacing between the vertical reinforcement bars LR deviates from a preset value and a reinforcement error ΔW occurs, causing the traveling frame 113 to vibrate from side to side, the cargo platform 134 of the cargo handling unit 130 swings from side to side along with the rolling of the transport roller 131, and in the opposite direction to the traveling frame 113, canceling out the vibration, as shown in Figure 3. This suppresses the left-right vibration of the long cargo TR mounted on the cargo platform 134.

[0049] Next, we will explain the process by which the automatic wheel position adjustment mechanism automatically adjusts the position of the wheels 111 when transporting, handling, and unloading long cargo TR such as large-diameter reinforcing bars on a reinforcing bar grid RG using the reinforcing bar cargo transport system 10 according to this embodiment.

[0050] When transporting long cargo TR on the cargo loading platform 134 of the cargo transport trolley 100 that constitutes the cargo transport system 10, there may be parts where a reinforcement error ΔW (leftward ΔW deviation) occurs in the vertical reinforcement LR, as shown in Figure 4.

[0051] When traveling over vertical reinforcing bars LR where a reinforcing bar placement error ΔW occurs, the entire reinforcing bar cargo transport trolley 100 moves in a straight line, and the wheels 111 traveling over the area where the reinforcing bar placement error ΔW occurs automatically adjust their position by sliding within the travel frame 113 along the axle 112 in the direction of the reinforcing bar placement error ΔW (to the left) by the same distance as the reinforcing bar placement error ΔW.

[0052] Figure 5 shows the process by which this automatic wheel position adjustment mechanism automatically adjusts the position of the wheel 111.

[0053] Figure 5(A) shows the state of the running frame 113 and wheels 111 when the vehicle is running over a section where the vertical reinforcement bars LR are positioned correctly. The wheels 111 are located in the center of the running frame 113, and the tread portion 111r of the wheels 111 is positioned directly above the vertical reinforcement bars LR as the vehicle runs.

[0054] When the wheel 111 travels over a section where a leftward reinforcement error ΔW occurs in the vertical reinforcement LR, the tapered surface portion 111p on the left side of the wheel 111 will ride up onto the vertical reinforcement LR, as shown in Figure 5(B).

[0055] At this time, the tapered surface portion 111p receives a force from the vertical reinforcement LR that includes a leftward component. In response to this force, the entire wheel 111 slides to the left, and as shown in Figure 5(C), the wheel 111 travels along the vertical reinforcement LR with the wheel 111 slid to the left by a distance ΔW from the center within the running frame 113.

[0056] Note that while Figure 5(B) depicts a larger amount of overhang for illustrative purposes, in reality, if the left tapered surface 111p even slightly rides over the longitudinal reinforcement LR that is currently being driven on, it immediately receives a force from the longitudinal reinforcement LR that includes a leftward component. Therefore, the leftward sliding of the wheel 111 occurs quickly before reaching the state shown in Figure 5(B). Consequently, in the process of automatically adjusting the position of the wheel 111 by this automatic wheel position adjustment mechanism, the vertical movement of the running frame 113 is minimal, and the vertical movement of the long cargo TR mounted on the cargo platform 134 is suppressed.

[0057] Furthermore, because the coupling unit 120 connects and fixes multiple running frames 113, which are arranged in parallel on the left and right sides, at a position midway between the wheels 111 that make up a pair of front and rear wheels, even if one of the front or rear wheels 111 moves up and down, the amount of vertical movement of the coupling unit 120 is reduced by about half, further suppressing the vertical movement of the long cargo TR loaded on the cargo platform 134.

[0058] Furthermore, in areas where the reinforcement spacing RS of the longitudinal reinforcement LR used as rails deviates from a predetermined value, resulting in a reinforcement error ΔW, and / or areas where reinforcement is doubled as a lap joint, even if the tapered surface portion 111p of the front or rear wheel 111 rides over the longitudinal reinforcement LR and the running frame 113 and connecting unit 120 vibrate from side to side, the cargo platform 134 carrying the long cargo TR maintains its inertial motion. This is achieved by oscillating from side to side in the opposite direction to the vibration of the running frame 113 and connecting unit 120, accompanied by the rolling of the transport rollers 131, thereby canceling out the vibration. This minimizes the lateral movement of the cargo platform 134 and prevents cargo collapse even when transporting long cargo TR with a circular cross-section, such as large diameter reinforcing bars.

[0059] When a worker P needs to access the long cargo TR from the left or right side of the rebar cargo transport trolley 100 for purposes such as handling the cargo, as shown in Figure 6, the long cargo TR loaded on the cargo platform 134 can be moved left or right simply by pushing the cargo platform 134 in the left or right direction.

[0060] When the long cargo TR arrives at its destination, pushing the cargo platform 134 further sideways causes the cargo platform 134 to slide sideways on the transport roller 131, accompanied by the rolling of the transport roller 131. Subsequently, one end detaches from the transport roller 131 and falls onto the reinforced concrete grid RG, causing the cargo platform 134 to form an inclined surface.

[0061] In this process, the long cargo TR loaded on the cargo platform 134 slides down the inclined surface formed by the cargo platform 134 to the reinforced concrete grid RG, easily completing the unloading operation. As a result, the worker P is freed from the task of carrying the heavy long cargo TR and the risk of injury from dropping the cargo TR on their feet during unloading is reduced.

[0062] As described above, according to the rebar-top cargo transport system 10 of the present invention, cargo is loaded onto multiple rebar-top cargo transport trolleys 100 that run on rails, which are rebar grids RG consisting of multiple horizontal rebars HR laid parallel to each other along the left-right direction of the construction surface G and multiple vertical rebars LR laid parallel to each other along the front-rear direction on these horizontal rebars HR. By arranging multiple rebar-top cargo transport trolleys 100 at any position according to the dimensions and weight of the long cargo TR, the rebar-top cargo transport system 10 can be configured.

[0063] Furthermore, the rebar-mounted cargo transport trolley 100 is composed of a wheel unit 110 consisting of wheels 111 that serve as front and rear wheels that run on one common vertical rebar LR among multiple vertical rebars LR, a pair of front and rear axles 112 that pivotally fix these wheels 111, and a running frame 113 that fixes both the left and right ends of the pair of front and rear axles 112 respectively, and a connecting unit 120 that connects and fixes multiple wheel units 110 to each other in parallel at intervals three times the rebar spacing RS of the vertical rebars LR from left to right, thereby enabling stable transport of the loaded long cargo TR.

[0064] The front and rear wheels 111 are each equipped with a short cylindrical tread portion 111r and tapered surface portions 111p that widen in diameter and are connected to the left and right sides of the tread portion 111r, and are configured to slide freely from side to side along a pair of axles 112. An automatic wheel position adjustment mechanism is provided that allows the tapered surface portions 111p to slide from side to side along the axles 112 within the running frame 113 in response to the force received by the tapered surface portions 111p from the longitudinal bars LR that are currently being driven on. This prevents the front and rear wheels 111 from coming off the longitudinal bars LR that are currently being driven on, and minimizes vertical movement and forward / backward tilting of the cargo loading platform 134, thereby preventing cargo collapse.

[0065] Since the cargo handling unit 130, which is equipped with long cargo TR, moves from side to side on top of the connecting unit 120, cargo handling can be performed from side to side on the rebar cargo transport trolley 100.

[0066] The cargo handling unit 130 is composed of a plurality of transport rollers 131, each pivotably mounted on a plurality of roller shafts 132 extending in the front-rear direction and arranged at predetermined intervals to the left and right along the connecting unit 120; a pair of transport guides 133 extending to the left and right, positioned opposite each other in front of and behind the transport rollers 131 along the connecting unit 120; and a cargo platform 134 mounted on the transport rollers 131 and between the pair of transport guides 133 so as to be slidable and detachable from left to right. This minimizes the lateral movement of the cargo platform 134, preventing cargo collapse even when transporting long cargo TR with a circular cross-section, such as reinforcing bars. Furthermore, upon arrival at the destination of the cargo, simply pushing the cargo platform 134 sideways causes the long cargo TR to slide sideways together with the cargo platform 134 and slide down the inclined surface formed by the cargo platform 134 to the reinforcing bar grid RG, thus easily completing the unloading operation. [Explanation of symbols]

[0067] 10·········Reinforcement bar cargo transport system 100, 100'... Rebar-mounted cargo transport cart 110, 110'... Wheel unit 111, 111'... Wheels (front and rear wheels) 111r...Tread section 111p·······Tapered surface 112, 112'... axle 113, 113'... Running frame 120, 120'... Connecting Unit 121, 121'...Connection base 122, 122'...Connected upright part 123, 123'...Connected top 130, 130'... Loading / unloading unit 131, 131'... Conveyor rollers 132, 132'... Roller shaft 133, 133'... Conveyor guide 133a, 133'a... Guide base 133b, 133'b... Guide wall section 133c, 133'c... Guide guidance section 134, 134'...Cargo loading platform FW·········Frame inner dimensions WW...Wheel width RG··········reinforced concrete grid LR·········Vertical lines HR··········horizontal lines RS Reinforcement spacing ΔW······················ Reinforcement arrangement error TR...Long cargo S·········Spacer G·········Construction side P····················· Worker

Claims

1. A rebar cargo transport system that transports cargo on multiple rebar cargo transport trolleys that run on the vertical bars of a rebar grid, which consists of multiple horizontal bars laid parallel to each other along the left-right direction of the construction surface and multiple vertical bars laid parallel to each other along the front-rear direction on the horizontal bars, the vertical bars of the grid serving as rails, The aforementioned rebar transport trolley is composed of a wheel unit consisting of a front wheel and a rear wheel that travel on one common vertical rebar among the plurality of vertical rebars, a pair of front and rear axles that pivotally secure the front wheel and rear wheel, respectively, and a travel frame that fixes both the left and right ends of the pair of front and rear axles, respectively, and a connecting unit that connects and fixes a plurality of the wheel units to each other in parallel at predetermined intervals from left to right. A rebar cargo transport system characterized in that the front and rear wheels are each equipped with a short cylindrical tread portion and tapered surfaces that widen in diameter and are connected to the left and right sides of the tread portion, and are configured to slide freely from side to side along the pair of axles, and are equipped with an automatic wheel position adjustment mechanism that slides from side to side along the axles within the travel frame in response to the force that the tapered surfaces receive from the longitudinal rebars that are currently being driven on.

2. A rebar-top cargo transport system comprising a rebar grid consisting of multiple horizontal bars laid parallel to each other along the left-right direction of the construction surface and multiple vertical bars laid parallel to each other along the front-rear direction on the horizontal bars, wherein the vertical bars of the grid are used as rails to transport the cargo being carried, the rebar-top cargo transport trolley comprises The vehicle is composed of a wheel unit consisting of a front wheel and a rear wheel that travel on one common vertical groove among the plurality of vertical grooves, a pair of front and rear axles that pivotally secure the front and rear wheels, respectively, and a running frame that fixes both the left and right ends of the pair of front and rear axles, a connecting unit that connects and fixes a plurality of the wheel units in parallel on the left and right, and a cargo handling unit provided on top of the connecting unit for moving the loaded cargo in the left and right directions, A rebar transport trolley characterized in that the front and rear wheels are each equipped with a short cylindrical tread portion and tapered surfaces that widen in diameter and are connected to the left and right sides of the tread portion, and are configured to slide freely from side to side along the pair of axles, and are equipped with an automatic wheel position adjustment mechanism that slides from side to side along the axles within the travel frame in response to the force that the tapered surfaces receive from the vertical rebars that are currently being driven on.

3. The rebar-mounted cargo transport trolley according to claim 2, characterized in that the cargo handling unit comprises a plurality of transport rollers, each pivotably attached to a plurality of roller shafts extending in the front-rear direction and arranged at predetermined intervals to the left and right along the connecting unit; a pair of transport guides extending to the left and right, positioned opposite each other in front of and behind the transport rollers along the connecting unit; and a cargo platform slidably and detachably mounted on the transport rollers.

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