Concrete Plant

Abstract

To provide a concrete plant which can eliminate necessity of applying a pass permit for a specialized vehicle, can minimize an occupancy area at a construction site to the extent possible and has high concrete supply capacity.SOLUTION: A concrete plant comprises: a transport vehicle 10; a concrete plant unit 20 which is mounted on a loading platform 11 of the transport vehicle 10 and carried therewith; a mixer 50 which is not included in component elements of the concrete plant unit 20 when being transported and included in the same when producing concrete; and a mixer trestle 25 which is installed posterior to the plant unit 20 and supports the mixer 50 at least when concrete is produced. The mixer trestle 25 has a rail 26 thereon. The mixer 50 has a sliding jig 55 beneath the same. The mixer 50 mounted on the mixer trestle 25 can be moved to a mixing position with the sliding jig 55 sliding along the rail 26.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a concrete plant. [Background technology]

[0002] In recent years, due to the increasing need for high-performance concrete and the extension of the service life of existing structures, there has been progress in the development of technologies for repairing and reinforcing existing structures, such as reinforced concrete deck slabs in road bridges, using high-performance concrete. This high-performance concrete is a special type of concrete that is not generally supplied by ready-mix concrete plants in the city, and even if repair and reinforcement technologies are established, there is a major problem in that it is not possible to actually supply special concrete to construction sites. Here, in this specification, "high-performance concrete," "special concrete," "high-strength concrete," and "ultra-high-strength concrete" refer to, for example, concrete that has high compressive strength, toughness, and durability, and one example is ultra-high-performance fiber-reinforced concrete that uses special materials (premixed powder made by mixing cement and admixtures, materials that use sand, fiber, water, admixtures, etc.). In response to this, mobile concrete plants (mobile plants) that are transported to construction sites and produce concrete there are sometimes used. However, because conventional mobile plants are designed to produce ordinary concrete, various issues can arise when producing (mixing) special concrete such as ultra-high strength concrete. First, although mobile, the mixer is small, meaning that only high-performance twin-shaft mixers of around 250 L can be mounted, and even the older pan mixers have a maximum capacity of 500 L, which poses an issue with mixer capacity. As a result, the amount of concrete supplied during deck repairs cannot be met, and construction work must be carried out using multiple mobile plants at the same time, which inevitably increases the area occupied by the mobile plants, making it difficult to carry out repair work while the road remains in use. Another issue is that high-performance concrete and special concrete often have high viscosity, which tends to result in insufficient mixing performance from mixers. Because these materials place a heavy load on the mixer when mixing, they are usually mixed with a reduced mixing volume of about 50 to 70 percent of the rated capacity. In addition to the aforementioned insufficient mixer capacity, reducing the mixing volume further leads to insufficient supply.

[0003] Therefore, in order to improve the mixing performance of the mixer, one possible method would be to apply for a special vehicle permit (a special permit required for road use due to weight and size exceeding specified values) and then transport a large mobile plant.However, applying for a special vehicle is time-consuming and expensive, and it takes several days to obtain the permit.In addition, it is often necessary to use a lead vehicle or a follow vehicle when transporting the mobile plant, which leads to a significant increase in costs, making this a difficult and realistic measure. For these reasons, there is a need for a concrete plant that does not require special vehicle applications, occupies as little space as possible at the construction site, and has a high concrete supply rate.

[0004] Patent Document 1 proposes a ready-mixed concrete manufacturing system that enables a stable supply of ready-mixed concrete in accordance with the progress of construction work. This manufacturing system is a series of ready-mixed concrete manufacturing systems consisting of at least a raw material storage process, a supply process, and a mixing process, and each vehicle is equipped with the equipment required for each process so that all processes required for the system can be carried out. Here, the vehicles equipped with the equipment required for each process are a mixing mixer truck equipped with a ready-mixed concrete raw material supply device with a measuring device and a kneading device and operation panel connected to it, a cement silo truck equipped with a silo for storing cement, a water tanker truck equipped with a water storage tank, and a conveyor truck equipped with a conveyor.

[0005] Meanwhile, Patent Document 2 proposes a mobile batcher plant that solves the noise problem. This mobile batcher plant includes a powder storage device that stores pre-blended powder materials, an aggregate storage device that stores aggregates, a water storage device that stores water, a mixing device that mixes powder materials, aggregates, and water, a powder conveying device, an aggregate conveying device, a water supply device, a control device that controls the operation of each device, a support structure that supports at least one of the devices and is configured to be mountable on a vehicle, and a noise reduction mechanism that reduces noise generated from at least one of the devices and the support structure. Here, each device is to be installed on the bed of a medium-sized truck. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 7-52141 [Patent Document 2] Japanese Patent Application Publication No. 2020-142400 Summary of the Invention [Problem to be solved by the invention]

[0007] In the ready-mixed concrete manufacturing system described in Patent Document 1, various devices are mounted on their own vehicles, and at the construction site, the manufacturing system is constructed with multiple vehicles parked side by side, which naturally results in a large occupied area.For example, when repairing the deck of the road bridge mentioned above, it is undeniable that it becomes difficult to carry out repair work while the road is in use. On the other hand, the mobile batcher plant described in Patent Document 2 is of a scale that can be installed on the bed of a medium-sized truck, and therefore the mixer is also small in scale, and it is difficult to say that it is a plant with a high concrete supply capacity.

[0008] The present invention aims to provide a concrete plant that does not require a special vehicle application, occupies as little space as possible at the construction site, and has a high concrete supply rate. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the concrete plant according to the present invention is as follows: A transport vehicle, a concrete plant unit that is loaded onto a bed of the transport vehicle and transported by the transport vehicle; a mixer that is not included in the plant unit during transportation but becomes a component of the plant unit during concrete production; a mixer stand that is provided behind the plant unit and supports the mixer at least during the concrete production; A rail is provided on the mixer stand, The mixer is provided with a slide jig below it, The mixer mounted on the mixer stand moves to a mixing position while sliding the slide jig along the rail.

[0010] According to this aspect, when the concrete plant unit is loaded onto the bed of the transport vehicle and transported, the mixer is not included in the plant unit, but becomes a component of the plant unit when concrete is produced. In other words, by excluding the weight of the mixer when the transport vehicle is transported, the weight of the plant unit other than the mixer can be made as large as possible within the vehicle weight range that does not require a special vehicle application, and the weight of the mixer that is transported separately can also be made as large as possible.Therefore, a mixer with high mixing performance and concrete supply capacity can be applied while eliminating the need for a special vehicle application, and a concrete plant with a high concrete supply capacity can be formed. Furthermore, the mixer is pulled into the mixing position while sliding the slide jig attached to the mixer along the rails on the mixer stand, preventing interference between the mixer and the plant unit when the mixer is hoisted, transported, and installed on the mixer stand.The mixer can then be smoothly slid and pulled into the plant unit, enabling it to be installed efficiently, safely, and reliably at the mixing position. Furthermore, because the concrete plant unit is loaded onto the loading platform of a single transport vehicle, there is no risk of multiple vehicles or plant units taking up a large area on-site. For example, when repairing the deck of a road bridge, repair work can be carried out while the road is in use. This makes the system ideal for narrow construction sites, construction sites where the concrete manufacturing location changes frequently, and construction sites where concrete is poured in a relatively short period of time.

[0011] At a construction site, when the mixer is installed on a mixer stand, a so-called on-board concrete plant is formed, in which concrete is produced with the plant unit mounted on the bed of a transport vehicle. A on-board concrete plant can, for example, fit within one lane (for example, the concrete plant can be designed within a lane width of 2.5 m), and for example, the on-board concrete plant can be installed within one lane of a highway, leaving the other lanes open for road traffic.

[0012] In addition to this vehicle-mounted concrete plant, the concrete plant of the present invention can also be a so-called stationary concrete plant, in which the transport vehicle is retracted and the plant unit is installed on the road surface or the like while maintaining the configuration of the plant unit at the time of transport.Furthermore, by installing an external aggregate storage device, powder storage device, etc., on the plant unit installed on the road surface or the like, the aggregate storage capacity and powder storage capacity can be increased, thereby forming another type of stationary concrete plant that can automatically produce more concrete. In this way, the concrete plant of this embodiment is a concrete plant whose functions can be expanded in various ways according to the needs of the construction site, and a mobile plant with such multiple functions is a new concrete plant that has not existed before, and is highly mobile and expandable. Furthermore, because it has high mixing performance and concrete supply volume, the concrete that can be manufactured includes not only ordinary concrete, but also highly viscous ultra-high strength fiber reinforced concrete (UFC (Ultra High Strength Fiber Reinforced Concrete) and UHPFRC (Ultra High Performance Fiber Reinforced Concrete)) and environmentally friendly concrete (concrete that uses industrial by-products such as blast furnace slag (a by-product of steelmaking) and fly ash (coal ash) instead of cement, thereby reducing CO2 emissions).

[0013] Here, "special vehicle" refers to a special vehicle that falls under the special vehicle traffic permit system, and "no special vehicle application required" means that the vehicle can be driven without applying for a special vehicle traffic permit. Regarding special vehicle applications, an application is required for vehicles exceeding 20 tons on roads other than designated roads. If the maximum weight of the plant unit is around 9 tons, an application is not required if the vehicle weight is reduced to around 10 tons (10-ton vehicle). Strictly speaking, an application is not required if the vehicle also meets other restrictions, such as the width limit (2.5m), the height limit with the plant unit mounted on the loading platform (3.8m (4.1m on designated roads)), and the length limit (12m). Furthermore, "a mixer stand that is provided behind the plant unit at least during concrete production and supports the mixer" includes both a configuration in which the mixer stand is attached to the rear of the plant unit when it is loaded onto the bed of a transport vehicle and transported, and a configuration in which the mixer stand is not attached to the rear of the plant unit during transportation, but is attached to the rear of the plant unit during concrete production. The aggregate storage device also includes a coarse aggregate storage device and a fine aggregate storage device, and a predetermined amount of coarse aggregate and fine aggregate are supplied to storage hoppers and other components of each storage device. Meanwhile, the powder storage device has storage hoppers to which powder such as cement is supplied. Each storage hopper and a retrofitted mixer are connected by an aggregate transport device such as a belt conveyor and a powder transport device such as a screw conveyor, so that various materials can be supplied to the mixer. The plant unit also includes other equipment required for concrete production, such as a water tank for storing water, an additive tank for storing additives, and supply pipes and supply pumps for supplying water and additives from the water tank and additive tank to the mixer.

[0014] Another aspect of the concrete plant according to the present invention is The slide jig is characterized in that it is formed of an endless roller.

[0015] According to this aspect, the slide jig is formed of an endless roller, so that the heavy mixer can be smoothly and reliably slid along the rail to the mixing position and precisely installed.

[0016] Another aspect of the concrete plant according to the present invention is The slide jig is characterized by having a fall prevention means for preventing the slide jig from falling off the rail.

[0017] According to this aspect, the slide jig is provided with a fall prevention means for preventing it from falling off the rail, so that the heavy mixer can be smoothly and safely slid along the rail to the mixing position and installed.

[0018] Another aspect of the concrete plant according to the present invention is At the mixing position, the slide jig is fixed to the rail via a stopper.

[0019] According to this embodiment, the slide jig is fixed to the rail via a stopper at the mixing position, so that the mixer moved to the mixing position can be firmly fixed to the rail, preventing displacement due to, for example, the mixer's own vibration when mixing concrete.

[0020] In another aspect of the concrete plant according to the present invention, The mixer stand is pre-installed at the rear of the plant unit, The mixer stand rotates or slides from a position where it is housed in the loading platform to project behind the loading platform, thereby assuming a position for supporting the mixer.

[0021] According to this aspect, the mixer stand, which is pre-installed at the rear of the plant unit, rotates or slides from its position when housed in the loading platform to protrude behind the loading platform, forming a support position for the mixer, and by supporting the mixer, the mixer can be used as a component of the plant unit at the construction site as needed. In addition, because the mixer stand does not protrude behind the loading platform when the transport vehicle is traveling on public roads, the possibility of exceeding the vehicle length limit that requires a special vehicle application can be reduced.

[0022] In another aspect of the concrete plant according to the present invention, The mixer stand is pre-installed at the rear of the plant unit, The plant unit is mounted on the loading platform so as to be freely slidable, and the mixer stand extends behind the loading platform as the plant unit slides rearward, thereby forming a support posture for the mixer.

[0023] According to this aspect, when the plant unit slides rearward on the loading platform, the mixer stand extends behind the loading platform to form a support position for the mixer, and by supporting the mixer, the mixer can be used as a component of the plant unit at the construction site as needed. In addition, because the mixer stand does not extend behind the loading platform when the transport vehicle is traveling on public roads, the possibility of exceeding the vehicle length limit that requires a special vehicle application can be reduced.

[0024] Another aspect of the concrete plant according to the present invention is The vehicle is characterized by having support legs that support the mixer stand and extend to the rear of the loading platform.

[0025] According to this aspect, by providing the support legs that support the mixer stand that protrudes rearward from the loading platform, it is possible to prevent the mixer stand from supporting the weight of the mixer in a cantilevered state, and to stably support the mixer. The support legs may be attached to the mixer stand in advance, or may be attached to the mixer stand after the mixer stand has been extended rearward.

[0026] Another aspect of the concrete plant according to the present invention is The support legs are characterized by having wheels.

[0027] According to this aspect, since the support legs are equipped with wheels, when the transport vehicle moves at a low speed, the mixer stand can also move while supporting the mixer, following the movement of the transport vehicle. This meets the needs of construction sites where it is necessary to move the concrete plant in response to changes in the concrete pouring location. [Effects of the Invention]

[0028] According to the concrete plant of the present invention, it is possible to provide a concrete plant that does not require a special vehicle application, can minimize the area occupied at the construction site, and has a high concrete supply volume. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 2 is a perspective view showing a state in which a vehicle-mounted concrete plant, which is an example of a concrete plant according to the first embodiment, is traveling on a public road. [Figure 2] FIG. 10 is a perspective view showing a state in which the plant unit is slid rearward on the loading platform of the transport vehicle. [Figure 3] FIG. 10 is a diagram illustrating a situation in which the mixer is being towed to the mixing position on the rails of the mixer stand. [Figure 4] FIG. 2 is an enlarged view of an example of a slide jig attached to a mixer. [Figure 5] FIG. 1 shows the mixer secured to the rails in the mixing position. [Figure 6] FIG. 1 is a perspective view showing the state of the vehicle-mounted concrete plant during concrete production. [Figure 7] FIG. 10 is a diagram showing a state in which the mixer stand is supported by an example of a support leg. [Figure 8] FIG. 10 is a diagram showing a state in which the mixer stand is supported by another example of the support legs. [Figure 9] FIG. 1 is a block diagram showing a schematic diagram of each component of a plant unit that constitutes a vehicle-mounted concrete plant. [Figure 10] FIG. 10 is a perspective view showing a stationary concrete plant, which is an example of a concrete plant according to a second embodiment, in a state where the plant is freestanding with outriggers extended. [Figure 11] This is a perspective view showing the state in which the transport vehicles have been evacuated and a stationary concrete plant has been formed. [Figure 12] This is a perspective view showing an external fiber storage device and an external fiber conveying device installed in a stationary concrete plant. [Figure 13] FIG. 10 is a perspective view showing a stationary concrete plant, which is an example of a concrete plant according to a third embodiment. [Figure 14]FIG. 1 is a block diagram showing the components of a plant unit that constitutes a stationary concrete plant. [Figure 15] FIG. 2 is a diagram illustrating an example of a hardware configuration of a control device. [Figure 16] FIG. 2 is a diagram illustrating an example of a functional configuration of a control device. [Figure 17] 10 is a flowchart showing an example of a control flow of a control device. [Figure 18A] FIG. 10 is a diagram showing an example of a selection screen in a design operation screen of a control device. [Figure 18B] FIG. 10 is a diagram showing an example of a main screen in a design operation screen of a control device. [Figure 18C] FIG. 10 is a diagram showing an example of a kneading timer setting screen on the design operation screen of the control device. [Figure 18D] FIG. 10 is a diagram showing an example of an operation screen in a design operation screen of the control device. [Figure 19] FIG. 10 is a diagram showing an example of time-series data of mixer load values ​​and management reference values ​​on the display screen of the control device. [Figure 20] 1 is a perspective view showing an example of a material supplying device including a fiber storage device and a fiber conveying device. [Figure 21] 10 is a diagram showing a state in which a container, which is a fiber storage device, is housed inside a safety device that constitutes a kneading material supply device. FIG. [Figure 22] 21 is a diagram showing a state following FIG. 20 in which the container is moved upward and rotates above the mixer. [Figure 23] 23 is a diagram showing a state following FIG. 22 in which the container further rotates to feed the material to be kneaded into the mixer. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, concrete plants according to each embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially identical components are designated by the same reference numerals, and redundant description may be omitted.

[0031] [Concrete plant according to the first embodiment] First, an example of a concrete plant according to the first embodiment will be described with reference to FIGS. 1 to 9. Here, FIG. 1 is a perspective view showing a state of a vehicle-mounted concrete plant, which is an example of a concrete plant according to the first embodiment, when traveling on a public road. Also, FIG. 2 is a perspective view showing a state in which a plant unit is sliding rearward on the bed of a transport vehicle, and FIG. 3 is a diagram illustrating a state in which a mixer is towed to a mixing position on the rails of a mixer stand. Also, FIG. 4 is an enlarged view of an example of a sliding jig attached to a mixer, and FIG. 5 is a diagram showing a state in which the mixer is fixed to the rails at the mixing position. Furthermore, FIG. 6 is a perspective view showing a state in which the vehicle-mounted concrete plant is producing concrete, and FIG. 9 is a block diagram schematically showing each component of the plant unit constituting the vehicle-mounted concrete plant.

[0032] Note that each of the concrete plants according to the embodiments is equipped with a control device that drives and controls each device, but the hardware configuration and functional configuration of the control device will be explained in the section on the concrete plant according to the third embodiment. Also, the vehicle-mounted concrete plant in the illustrated example will be explained as a form that does not include a fiber storage device or a fiber conveying device, but the vehicle-mounted concrete plant may also include these devices.

[0033] The concrete plant 100 shown in Figure 1 is a vehicle-mounted concrete plant that moves to a construction site with a plant unit 20 mounted on the loading platform 11 of a transport vehicle 10, and produces concrete at the construction site with the plant unit 20 mounted on the loading platform 11.

[0034] Here, examples of construction sites and construction objects to which the illustrated mobile concrete plant 100 and the stationary concrete plants 200 and 300 described below can be applied include RC deck slabs of highway bridges, bridge girder superstructures that are constructed by overhanging bridges, RC structures on the middle and upper floors of high-rise buildings under construction, concrete lining on the face and sides of mountain tunnels, and RC structures underground in large box culvert construction.

[0035] The transport vehicle 10 is, for example, a 10-ton truck (large truck), with the plant unit 20 mounted on the loading platform 11 and the total weight set to 20 tons or less with a crew on board. Therefore, the on-board concrete plant 100 is a concrete plant with a total weight that does not require a special vehicle application for driving on public roads.

[0036] Regarding the "special vehicle application," an application is required if the vehicle exceeds 20 tons on roads other than designated ones, but if the maximum weight of the plant unit 20 is around 9 tons, an application is not required if the transport vehicle 10 is a 10-ton truck. Strictly speaking, an application is not required if other restrictions are also met, such as the width restriction (2.5 m) for the transport vehicle 10, the height restriction with the plant unit 20 loaded on the loading platform 11 (3.8 m (4.1 m on designated roads)), and the length restriction (12 m) for the transport vehicle 10.

[0037] The plant unit 20 constituting the vehicle-mounted concrete plant 100 for running on public roads shown in FIG. 1 has a frame structure 21 equipped with a work stage 22 on the top surface and a mixer stand 25 at the rear.

[0038] As shown in Figure 9, inside the frame structure 21 are stored a coarse aggregate storage device 31A (an example of an aggregate storage device), a fine aggregate storage device 31B (an example of an aggregate storage device), a coarse aggregate transport device 34A (an example of an aggregate transport device) which is a belt conveyor, and a fine aggregate transport device 34B (an example of an aggregate transport device), a powder storage device 35, a powder transport device 38 which is a screw conveyor, a water tank 41, an additive tank 45, a control device 60 which controls each device, and the like.

[0039] The work stage 22 is provided with a coarse aggregate inlet 32A (an example of an aggregate inlet), a fine aggregate inlet 32B (an example of an aggregate inlet), and a powder inlet 36, and each inlet is fitted with an open / close lid that is closed except when material is being added.

[0040] The plant unit 20 that constitutes the vehicle-mounted concrete plant 100 when driven on public roads does not include a mixer, and the mixer 50 shown in Figure 3, etc. is transported to the construction site by a separate transport vehicle (not shown), and is installed on the mixer stand 25 at the construction site, thereby becoming a component of the plant unit 20.

[0041] As shown in Figure 2, after the transport vehicle 10 arrives at the construction site, the vehicle-mounted concrete plant 100 is changed into a position for concrete production. A frame structure 21 constituting the plant unit 20 is slidably mounted on the loading platform 11 of the transport vehicle 10, and when the plant unit 20 slides rearward in the X1 direction, the mixer stand 25 at the rear of the frame structure 21 extends behind the loading platform 11, forming a position supporting the mixer 50.

[0042] A generator 18 is mounted on the front of the loading platform 11 to supply power to each device during concrete production, and when the transport vehicle 10 is traveling on public roads, the generator 18 is housed inside the frame structure 21. When the plant unit 20 slides rearward at the construction site as shown in Figure 2, the generator 18 on the loading platform 11 is exposed to the outside and becomes ready for use.

[0043] Although not shown in the figures, the frame structure 21 does not slide on the loading platform 11, and the mixer platform is stored in the loading platform 11 when the transport vehicle 10 is traveling on public roads, and at the construction site, the mixer platform may be configured to rotate or slide from the stored position so that it protrudes behind the loading platform 11.

[0044] Handrails 23 are provided around the work stage 22 so that they can be raised and lowered or attached freely, and as shown in Fig. 2, the handrails 23 are installed around the work stage 22 when producing concrete. For example, the handrails 23 may be extended upward by an actuator such as a cylinder mechanism (not shown), or the handrails 23 may be manually installed by a worker.

[0045] In the on-board concrete plant 100, workers on the work stage 22 load, for example, one batch of coarse aggregate, fine aggregate, and cement (powder) through each loading port. During this material loading work and other tasks, the work stage 22 is surrounded by handrails 23, ensuring work safety.

[0046] Furthermore, when the transport vehicle 10 is traveling on public roads, the handrail 23 does not protrude upward as shown in FIG. 1, which eliminates the risk of exceeding the height limit of the special vehicle application due to the handrail 23 protruding upward, and makes it possible to set the height of the work stage 22 up to the limit of the height limit.

[0047] After the mixer stand 25 extends behind the loading platform 11, as shown in Figure 3, the mixer 50, which has been transported to the construction site by another transport vehicle, is lifted up via a wire W by a heavy machine such as a crane and lowered in the X2 direction onto the mixer stand 25 extending behind the loading platform 11.

[0048] Two rails 26 made of H-beams or the like are installed on the mixer stand 25. On the other hand, endless rollers 55 (an example of a slide jig) are attached to the underside of the mixer 50 at positions corresponding to the rails 26.

[0049] 4, endless roller 55 is a jig in which a plurality of steel rollers 55b are installed inside a steel jig body 55a in an endless connected state, and each roller 55b rotates on its axis while revolving as a whole, thereby moving an object while reducing frictional resistance. Here, as the sliding jig, a member other than endless roller 55 that can reduce frictional resistance, such as a sheet of Teflon (registered trademark) material, may be used.

[0050] A drop prevention means 56 for preventing the endless roller 55 from disengaging from the rail 26 is provided on the side of the endless roller 55 .

[0051] Returning to Figure 3, a lever block (registered trademark) L is installed at any location on the frame structure 21, and a chain C extending from the lever block L is attached to the mixer 50. The mixer 50 is then pulled in the X3 direction toward the loading platform using the lever block L, whereby the mixer 50 is moved along the rail 26 to a predetermined mixing position.

[0052] As shown in Figure 5, after the mixer 50 has been moved to the mixing position on the rail 26, the stopper 57 is fixed to the rail 26, thereby preventing the endless roller 55 from moving, and the installation of the mixer 50 at the mixing position is completed.

[0053] 9, the top surface of mixer 50 is provided with receiving port 52a for receiving coarse aggregate supplied from coarse aggregate conveying device 34A, receiving port 52b for receiving fine aggregate supplied from fine aggregate conveying device 34B, receiving port 52c for receiving cement supplied from powder conveying device 38, receiving port 52e for receiving water supplied from supply pipe 42 leading to water tank 41, and receiving port 52f for receiving additives supplied from supply pipe 47 leading to additive tank 45. In addition, receiving ports for receiving materials to be mixed, air vent openings, a camera for capturing images of the mixing status inside mixer 50, lighting equipment for illuminating the inside of mixer 50 when capturing images, etc. are also installed on the top surface of mixer 50.

[0054] When the mixer 50 is installed at the mixing position, each material is aligned to a position where it can be received by the corresponding receiving port of the mixer 50, thereby forming a plant unit 20 capable of producing concrete.

[0055] Figure 6 shows a vehicle-mounted concrete plant 100 at a construction site, where a mixer 50 is a component of a plant unit 20 and is ready to produce concrete. As shown in Figures 6 and 7, a plurality of support legs 27 (two in the illustrated example) are installed below a mixer stand 25 that protrudes rearward, eliminating the cantilevered state of the mixer stand 25 and enabling the mixer 50 to be stably supported.

[0056] 7, a splash prevention cover 58 is attached to the rear of the mixer 50 to prevent concrete discharged from a discharge port (not shown) located below from scattering to the side. The concrete discharged from the discharge port of the mixer 50 can be received in various ways, such as by bringing a wheel loader nearby or by placing a container such as a bucket, and the splash prevention cover 58 can be removed as appropriate if it gets in the way of receiving the concrete.

[0057] 8, the mixer platform 25 may be supported by support legs 28 equipped with wheels 29. By supporting the mixer platform 25 on movable support legs 28 in this manner, when the transport vehicle 10 moves at a low speed on the construction site, the mixer platform 25, supporting the mixer 50, can also move along with the movement of the transport vehicle 10. This makes it possible to meet the need to move the concrete plant 20 at the construction site in response to changes in the concrete pouring location.

[0058] Next, with reference to FIG. 9, the components of the plant unit 20 that constitutes the on-board concrete plant 100 and the control of each device by the control device 60 will be described.

[0059] The coarse aggregate storage device 31A has a storage hopper whose cross section tapers downward, and this storage hopper serves as a measuring tank that measures and stores, for example, one batch of coarse aggregate. A coarse aggregate transport device 34A, which is a belt conveyor, is connected below the coarse aggregate storage device 31A, and the coarse aggregate transported in the Y1 direction by the coarse aggregate transport device 34A falls downward in the Y2 direction at the downstream end of the coarse aggregate transport device 34A and is received by the receiving port 52a of the mixer 50. An on-off valve 53a is provided between the receiving port 52a and the mixer main body 51, and when coarse aggregate is to be supplied to the mixer main body 51, the on-off valve 53a is opened to supply the coarse aggregate.

[0060] The fine aggregate storage device 31B has a storage hopper whose cross section narrows downward. This storage hopper serves as a measuring tank and measures and stores, for example, one batch of fine aggregate. A fine aggregate transport device 34B, which is a belt conveyor, is connected below the fine aggregate storage device 31B. The fine aggregate transported in the Y3 direction by the fine aggregate transport device 34B falls downward in the Y4 direction at the downstream end of the fine aggregate transport device 34B and is received by the receiving port 52b of the mixer 50. An on-off valve 53b is provided between the receiving port 52b and the mixer main body 51. When fine aggregate is to be supplied to the mixer main body 51, the on-off valve 53b is opened to supply the fine aggregate.

[0061] The powder storage device 35 has a storage hopper whose cross section tapers downward, and this storage hopper serves as a measuring tank that measures and stores, for example, one batch of powder (cement). A powder transport device 38, which is a screw conveyor, is connected below the powder storage device 35, and the powder transported in the Y5 direction by the powder transport device 38 falls downward in the Y6 direction at the downstream end of the powder transport device 38 and is received by the receiving port 52c of the mixer 50. An on-off valve 53c is provided between the receiving port 52c and the mixer main body 51, and when powder is supplied to the mixer main body 51, the on-off valve 53c is opened to supply fine aggregate.

[0062] The water tank 41 is connected to the receiving port 52e of the mixer 50 via a supply pipe 42 such as a hose, and the supply pipe 42 is equipped with a supply pump 43a that is driven when supplying water, a flow meter 43b, and an on-off valve 43c.For example, when supplying the water required to produce one batch of concrete to the mixer 50, the on-off valve 43c opens, the supply pump 43a is driven, and a predetermined amount of water is supplied from the water tank 41 in the Y7 direction.

[0063] The water tank 41 can store, for example, about 500 L of water (enough for several batches), and water is supplied to the water tank 41 by a pump or a hose connected to a water supply.

[0064] The additive tank 45 contains additives such as a set retarder and a water-reducing agent that are appropriate for the concrete to be produced. The additive tank 45 is connected to the receiving port 52f of the mixer 50 via a supply pipe 46. The supply pipe 46 is fitted with a supply pump 47a that is driven when supplying additives, a flow meter 47b, and an on-off valve 47c. For example, when the additives required to produce one batch of concrete are to be supplied to the mixer 50, the on-off valve 47c opens, the supply pump 47a is driven, and a predetermined amount of additives is supplied from the additive tank 45 in the direction Y8.

[0065] The mixer 50 has a mixer body 51, a load cell 51b that measures the total weight and the weight of the materials added when various materials are added to the mixer body 51, various receiving ports 52a, 52b, 52c, 52e, and 52f and corresponding on-off valves 53a, 53b, 53c, 53e, and 53f, a blade 51a that is located inside the mixer body 51 and kneads the various materials that have been added, and a mixing motor 54 that rotates the blade 51a in the Y10 direction.

[0066] The control device 60 is provided, for example, as an operation panel or control panel inside the plant unit 20, and inputs data such as blending data for producing concrete and control data for sequentially controlling each device when various materials are fed into the mixer 50 and mixed. Under the control of the control device 60, the plant unit 20 produces, for example, one batch of concrete.

[0067] Here, the series of steps involved in producing one batch of concrete includes the loading and weighing of materials into each storage device (measuring tank), the loading of materials into mixer 50, mixing by mixer 50, and the discharge (discharge) of the produced concrete. In this specification, a production mode in which, for example, a worker loads the materials for one batch and the other processes are carried out automatically is referred to as "semi-automatic production." On the other hand, a production mode in which, for example, two or three batches of materials have been loaded and all processes related to the production of each batch of concrete are carried out automatically in sequence is referred to as "automatic production."

[0068] The on-board concrete plant 100 and the stationary concrete plant 200 described below are semi-automatic concrete plants, in that a worker on the work stage 22 feeds, for example, one batch of materials through each feed port. On the other hand, the stationary concrete plant 300 described below is a concrete plant that is equipped with an external aggregate storage device and an external powder storage device, and can continuously produce, for example, three batches of concrete; since the second and third batches of concrete are continuously produced without the need for material input, it is an automatic concrete plant.

[0069] The blending data includes, for example, the type of cement, aggregate dimensions, concrete slump, air content, water-to-cement ratio, fine aggregate rate, unit water volume, amount of additives, etc. The control data includes the flow rate of the supply pumps 43a and 47a, the opening and closing timing of the on-off valves 53a to 53f, 43c, and 47c, the timing of material transport by the screw conveyor 38 and belt conveyors 34A and 34B, the timing and duration of driving the mixer 50, etc.

[0070] According to the illustrated vehicle-mounted concrete plant 100, when the concrete plant unit 20 is loaded onto the bed 11 of the transport vehicle 10 and transported, the mixer 50 is not included in the plant unit 20, but rather becomes a component of the plant unit 20 when concrete is produced.In other words, by excluding the weight of the mixer 50 when the transport vehicle 10 is transported, the weight of the plant unit 20 other than the mixer 50 can be made as large as possible within the vehicle weight range that does not require a special vehicle application, and the weight of the mixer 50 that is transported separately can also be made as large as possible.Therefore, a mixer 50 with high mixing performance and concrete supply capacity can be applied while eliminating the need for a special vehicle application, and a concrete plant with a high concrete supply capacity can be formed.

[0071] For example, while mixers in conventional mobile plants generally have a capacity of 250 L, with a maximum capacity of 500 L, the mixer 50 included in the vehicle-mounted concrete plant 100 can achieve a capacity of approximately 750 L. Furthermore, a mixing motor with performance 1.5 times or more that of conventional motors can be used for the mixing motor 54, enabling the production of special concrete such as UFC and UHPFRC, which have high viscosity and place a high load on the mixer.

[0072] By applying such a mixer 50, the mixing performance of ordinary concrete is 3 to 4 m 3 / h, and the mixing performance of special concrete is 2 to 3 m 3 / h can be achieved.

[0073] Furthermore, since the concrete plant unit 20 is mounted on the loading platform 11 of a single transport vehicle 10, there is no risk of multiple vehicles or plant units taking up a large area at the site. For example, when repairing the deck of a road bridge, repair work can be carried out while the road is in use. Therefore, the vehicle-mounted concrete plant 100 is suitable for narrow construction sites, construction sites where the concrete manufacturing location changes frequently, construction sites where concrete is poured in a relatively short period of time, etc.

[0074] [Concrete plant according to the second embodiment] Next, an example of a concrete plant according to a second embodiment will be described with reference to FIGS. 10 to 12. Here, FIG. 10 is a perspective view showing a stationary concrete plant, which is an example of a concrete plant according to the second embodiment, in a state where the outriggers are extended and the plant is freestanding. Also, FIG. 11 is a perspective view showing a state where the transport vehicles have been evacuated and the stationary concrete plant has been formed, and FIG. 12 is a perspective view showing a state where an external fiber storage device and an external fiber conveying device have been installed in the stationary concrete plant. Here, the stationary concrete plant shown in the figure includes an external aggregate storage device and an external powder storage device as components, but since the concrete plant according to the third embodiment described below also includes these components, the description with reference to a block diagram schematically showing the components of the stationary concrete plant will be made for the concrete plant according to the third embodiment described below.

[0075] The stationary concrete plant 200 shown in Figures 11 and 12 is a stationary concrete plant that is mounted on the loading platform 11 of a transport vehicle 10, and the plant unit 20 that has been transported to the construction site stands freestanding on the road surface R, and the posture for concrete production is formed by the transport vehicle 10 being retracted.

[0076] As shown in Figure 10, after a transport vehicle 10 arrives at a construction site with a plant unit 20 loaded onto its platform 11, multiple outriggers 15 are extended from the sides of a frame structure 21 of the plant unit 20, and the plant unit 20 is jacked up by jacks 16 such as hydraulic jacks provided on the outriggers 15. Here, the extension of the outriggers 15 from the frame structure 21 can be done in a form in which the outriggers 15 are automatically extended to the sides by a cylinder mechanism (not shown) or the like provided on the frame structure 21, or in a form in which the outriggers 15 are manually attached by a worker.

[0077] The plant unit 20 is jacked up by the multiple jacks 16, so that the plant unit 20 stands on the road surface R by itself.

[0078] In the self-standing plant unit 20, the mixer stand 25 is already in a state in which the mixer can be installed, and the mixer 50 is installed on the mixer stand 25 by the method already described.

[0079] Thereafter, as shown in FIGS. 10 and 11, the transport vehicle 10 retreats in the X5 direction, thereby forming a stationary concrete plant 200 in which the configuration of the plant unit 20 at the time of transportation is maintained.

[0080] In the stationary concrete plant 200, concrete may be produced while maintaining the configuration of the plant unit 20 at the time of transportation, but in the illustrated example, as shown in Figure 12, an external mixing material supply device 80 is installed on the plant unit 20 during transportation, resulting in a concrete plant including a plant unit 20A that makes it possible to produce ultra-high strength fiber reinforced concrete such as UFC and UHPFRC.

[0081] The configuration of the mixing material supply device 80 will be explained in detail below, but the mixing material supply device 80 has an elevator stand 83 (an example of a mixing material conveying device) that is erected on the road surface R near the mixer 50 to supply mixing material to the mixer 50, and is equipped with an elevator above and guide rails 85, and a container 81 (an example of a mixing material storage device) in which the mixing material is stored.

[0082] The elevator pulls the container 81 along the guide rail 85 to above the inlet of the mixer 50, and the container 81 rotates, thereby supplying the material to be kneaded to the mixer 50.

[0083] According to the stationary concrete plant 200, the transport vehicle 10 is not occupied at the construction site, and therefore, the transport vehicle 10 that has been evacuated can be used for other purposes during the concrete pouring period.

[0084] Furthermore, as shown in Figures 10 and 11, in a form in which the configuration of the plant unit 20 is maintained during transportation, the area occupied by the plant unit 20 can be made small, similar to that of the vehicle-mounted concrete plant 100, making it suitable for construction sites that are narrow, like the vehicle-mounted concrete plant 100, or construction sites where the concrete pouring time is longer than that of the vehicle-mounted concrete plant 100.

[0085] As shown in FIG. 12, a plant unit 20A is formed in which an external mixing material supply device 80 is installed, thereby making it possible to manufacture ultra-high strength fiber reinforced concrete and the like.

[0086] Regarding the occupied area, if the mobile concrete plant 100 is designed to fit into one 2.5m wide lane, when its functionality is expanded to become a freestanding stationary concrete plant 200, it will occupy, for example, two 5m wide lanes due to the extension of the outriggers 15, and if an external mixing material supply device 80, etc. is installed, it will occupy, for example, an area of ​​about 6m wide by utilizing the roadside strip.

[0087] [Concrete plant according to the third embodiment] Next, an example of a concrete plant according to the third embodiment will be described with reference to Fig. 13 and Fig. 14. Here, Fig. 13 is a perspective view showing a stationary concrete plant, which is an example of a concrete plant according to the third embodiment, and Fig. 14 is a block diagram schematically showing each component of a plant unit that makes up the stationary concrete plant.

[0088] The stationary concrete plant 300 shown in Figure 13 is a stationary concrete plant in which external aggregate storage devices 71A, 71B and an external powder storage device 75 are further installed in addition to the plant unit 20A of the concrete plant 200, thereby increasing the aggregate storage capacity and powder storage capacity.

[0089] By increasing the aggregate storage capacity and powder storage capacity, for example, the mobile concrete plant 100 and the stationary concrete plant 200 are semi-automatic concrete plants that produce one batch of concrete, whereas the stationary concrete plant 300 is an automatic concrete plant that continuously produces, for example, two or three batches of concrete. However, the stationary concrete plant 300 allows the user to choose between automatic and semi-automatic production, and semi-automatic production may be selected.

[0090] An external coarse aggregate storage device 71A (an example of an external aggregate storage device) and a coarse aggregate inlet 32A are connected by an external coarse aggregate transport device 74A which is a belt conveyor, an external fine aggregate storage device 71B (an example of an external aggregate storage device) and a fine aggregate inlet 32B are connected by an external fine aggregate transport device 74B which is a belt conveyor, and an external powder storage device 75 and a powder inlet 36 are connected by an external powder transport device 78 which is a screw conveyor. In addition, below the mixing material inlet position of a fiber storage device 81 which constitutes a mixing material supply device 80, a receiving port 52d of a mixer 50 (see FIG. 14) is aligned.

[0091] The illustrated external coarse aggregate conveying device 74A and the external fine aggregate conveying device 74B each have a cover around the belt conveyor to prevent coarse and fine aggregate from scattering during transport. Similarly, the external powder conveying device 78 also has a cover around the screw conveyor to prevent cement from scattering during transport. While the external coarse aggregate conveying device 74A, the external fine aggregate conveying device 74B, and the external powder conveying device 78 each have different inclination gradients in FIG. 13 , the inclination gradients of each conveying device can be appropriately changed depending on the installation location of the corresponding external storage device and the installation location of the corresponding inlet on the work stage 22. Furthermore, by providing each conveying device with an inclination gradient in this way, the overall footprint of the concrete plant can be minimized, enabling the stationary concrete plant 300 with its planar functional expansion to be applied to narrow construction sites.

[0092] 14, the external coarse aggregate storage device 71A has a storage hopper whose cross section narrows downward, and this storage hopper serves as a measuring tank for measuring and storing, for example, one or two batches of coarse aggregate. An external coarse aggregate conveying device 74A is connected below the external coarse aggregate storage device 71A, and the coarse aggregate conveyed in the Y11 direction by the external coarse aggregate conveying device 74A falls downward in the Y12 direction at the downstream end of the external coarse aggregate conveying device 74A and is supplied to the coarse aggregate storage device 31A through the coarse aggregate inlet 32A of the work stage 22.

[0093] The external fine aggregate storage device 71B has a storage hopper whose cross section narrows downward, and this storage hopper serves as a measuring tank for measuring and storing, for example, one or two batches of fine aggregate. An external fine aggregate conveying device 74B is connected below the external fine aggregate storage device 71B, and the fine aggregate conveyed in the Y13 direction by the external fine aggregate conveying device 74B falls downward in the Y14 direction at the downstream end of the external fine aggregate conveying device 74B and is supplied to the fine aggregate storage device 31B through the fine aggregate inlet 32B of the work stage 22.

[0094] The external powder storage device 75 has a storage hopper whose cross section narrows downward, and this storage hopper serves as a measuring tank that measures and stores, for example, one or two batches of powder (cement). An external powder conveying device 78 is connected below the external powder storage device 75, and cement conveyed in the Y15 direction by the external powder conveying device 78 falls downward in the Y16 direction at the downstream end of the external powder conveying device 78 and is supplied to the powder storage device 35 via the powder inlet 36 of the work stage 22.

[0095] The external material supply device 80 is erected on the road near the mixer 50 and has an elevator 84 on the upper side and an elevator stand 83 equipped with guide rails 85, and a container 81 for containing the material to be kneaded, and the container 81 is pulled by the elevator 84 along the guide rails 85 in the Y17 direction above the inlet of the mixer 50, and as the container 81 rotates, the material to be kneaded falls in the Y18 direction and is received by the receiving port 52d of the mixer 50. An opening / closing valve 53d is provided between the receiving port 52d and the mixer main body 51, and when the material to be kneaded is to be supplied to the mixer main body 51, the opening / closing valve 53d is opened to supply the material to be kneaded.

[0096] The stationary concrete plant 300 has a plant unit 20B with expanded functions compared to the stationary concrete plant 200, which maintains the configuration of the plant unit 20 at the time of transportation, and is a concrete plant that can automatically produce more concrete. In this way, a stationary concrete plant that can automatically produce an increased amount of concrete can reduce the number of workers required to mix the concrete, and is suitable for construction sites where the concrete pouring period is relatively long. The mixing performance of the stationary concrete plant 300 for ordinary concrete is 10 m 3 / h, and the mixing performance of special concrete is 3m 3 / h or more can be achieved.

[0097] Here, the term "mixing materials" includes fibrous materials and admixtures (coarse aggregate, fine aggregate, and powder). The term "fibrous materials" includes all materials that can be mixed into concrete, such as metal fibers (steel fibers, stainless steel fibers) and non-metallic fibers (aramid fibers, nylon fibers, vinylon fibers, polyethylene fibers, polypropylene fibers, carbon fibers, and basalt fibers). The term "admixtures" also includes all materials that can be mixed into concrete, such as special aggregates, slag, recycled aggregates, limestone, and calcium carbonate.

[0098] <About the control device> Next, an example of the specific configuration and control content of the control device provided in the concrete plant according to each embodiment will be described with reference to Fig. 15 to Fig. 19. Here, Fig. 15 is a diagram showing an example of the hardware configuration of the control device, Fig. 16 is a diagram showing an example of the functional configuration of the control device, and Fig. 17 is a flowchart showing an example of the control flow of the control device.

[0099] As shown in Figure 15, the control device 60 is composed of an information processing device such as a personal computer (PC) or a programmable logic controller (PLC), and is provided as a control panel or operation panel inside the frame structure 21 that forms the plant units 20, 20A, and 20B.

[0100] The information processing device constituting the control device 60 includes a CPU (Central Processing Unit) 61, a main memory device 62, an auxiliary memory device 63, an input / output IF (interface) 64, and a communication IF 65, which are interconnected by a connection bus 66. The main memory device 62 and the auxiliary memory device 63 are computer-readable recording media. Note that the above components may be provided separately, or some of the components may not be provided.

[0101] The CPU 61 is also called an MPU (Microprocessor) or a processor, and may be a single processor or a multiprocessor. The CPU 61 is a central processing unit that performs overall control of the control device 60, which is a computer. The CPU 61, for example, deploys a program stored in the auxiliary storage device 63 in an executable manner in a working area of ​​the main storage device 62, and controls peripheral devices through the execution of the program, thereby providing functions that meet a predetermined purpose.

[0102] The main memory device 62 stores computer programs executed by the CPU 61, data processed by the CPU 61, etc. The main memory device 62 includes, for example, a flash memory, a random access memory (RAM), and a read-only memory (ROM). The auxiliary memory device 63 stores various programs and data on a readable and writable recording medium and is also referred to as an external memory device. The auxiliary memory device 63 stores, for example, an operating system (OS), various programs, various tables, etc. The OS includes, for example, a communication interface program that exchanges data with external devices connected via the communication IF 65. The external devices connected to the control device 60 include the measuring tanks of each storage device, the belt conveyors and screw conveyors that constitute each transport device, the supply pump 43a, flow meter 43b, and on-off valve 43c that communicate with the water tank 41, the supply pump 47a, flow meter 47b, and on-off valve 47c that communicate with the additive tank 45, and the mixing motor 54 and on-off valves that constitute the mixer 50.

[0103] The auxiliary storage device 63 is used, for example, as a storage area that supplements the main storage device 62, and stores computer programs executed by the CPU 61, data processed by the CPU 61, etc. The auxiliary storage device 63 is a silicon disk including nonvolatile semiconductor memory (flash memory, EPROM (Erasable Programmable ROM)), a hard disk drive (HDD: Hard Disk Drive), a solid state drive, etc. Examples of the auxiliary storage device 63 include drives for removable recording media such as CD drives, DVD drives, and BD drives, and examples of removable recording media include CDs, DVDs, BDs, USB (Universal Serial Bus) memories, and SD (Secure Digital) memory cards.

[0104] The input / output IF 64 is an interface for inputting and outputting data between devices connected to the control device 60. Input devices such as a keyboard, a touch panel, a mouse, or other pointing device, and a microphone are connected to the input / output IF 64. The control device 60 receives operation instructions and the like from an operator who operates the input device via the input / output IF 64.

[0105] The input / output IF 64 is also connected to, for example, a display device such as a liquid crystal panel (LCD: Liquid Crystal Display) or an organic electroluminescence (EL: Electroluminescence) panel, a printer, a speaker, or other output devices.

[0106] The communication IF 65 is an interface with a network to which the control device 60 is connected. The communication IF 65 receives measurement data from each metering tank, metering meter, etc. via various networks, such as a public network such as the Internet, a wireless network such as a mobile phone network, a dedicated network such as a VPN (Virtual Private Network), a LAN (Local Area Network), Bluetooth (registered trademark), infrared communication, etc. Note that each piece of data may also be transmitted to the communication IF 65 via a wired connection.

[0107] 16, the control device 60 provides various functions of at least a communication unit 67, a control unit 67A, a determination unit 67B, a display unit 68, and a storage unit 69 by executing a program by a CPU 61. Here, at least a part of the processing functions may be provided by a DSP (Digital Signal Processor), a GPU (Graphics Processing Unit), or the like, and similarly, at least a part of the processing functions may be provided by a dedicated LSI (Large Scale Integration) such as an FPGA (Field-Programmable Gate Array), a numerical calculation processor, an image processing processor, or other digital circuits, or the like.

[0108] The communication unit 67 receives measurement data, such as data on one batch of coarse aggregate, fine aggregate, cement, water, and additives measured in each measuring tank, as well as measurement data from the load cell 51b on the total weight of the various materials finally put into the mixer body 51, and stores the data in the storage unit 69.

[0109] The storage unit 69 stores, for example, specified data regarding various ingredients for one batch, and the judgment unit 67B judges that the measurement data for the various ingredients is the specified data and notifies the control unit 67A that the various ingredients are ready to be mixed.

[0110] The storage unit 69 also stores control reference values ​​for the mixer load value and the flow test value during mixing by the mixer 50. Here, the "control reference value" in this specification includes strict reference values ​​based on various specifications, etc., as well as reference values ​​arbitrarily set based on in-house standards, etc. Regarding these control reference values, in the production of ordinary concrete, the control reference value for the primary mixing step in which aggregate, cement, and water (and additives) are mixed is stored. On the other hand, in the production of ultra-high-strength fiber-reinforced concrete such as UFC or UHPFRC, a primary mixing step in which aggregate, cement, and water (and additives) are mixed, and a secondary mixing step in which the primary mixing material produced in the primary mixing step is mixed with the mixing materials are performed, so control reference values ​​for both the primary mixing and secondary mixing steps are stored.

[0111] When the control unit 67A receives notification from the judgment unit 67B that the material is ready for mixing, it sequentially drives each conveying device and supply pump to supply the coarse aggregate, fine aggregate, cement, water, and additives to the mixer body 51 in a predetermined order, and drives the mixing motor 54 to perform the primary mixing and produce the primary mixed material.

[0112] When the primary kneaded material is manufactured, the judgment unit 67B compares the primary kneaded material with the control standard value of the primary kneaded material stored in the storage unit 69, and if the primary kneaded material does not meet the control standard value, the judgment unit 67B causes the mixer 50 to execute additional kneading control via the control unit 67A, and performs additional primary kneading.

[0113] If the concrete to be produced is ordinary concrete, the production of ordinary concrete ends when the determining unit 67B determines that the primary mix and additional primary mix meet the control standard values.

[0114] On the other hand, when the concrete to be produced is ultra-high strength fiber reinforced concrete, etc., after the judgment unit 67B determines that the primary mix and additional primary mix meet the control standard values, the control unit 67A drives the mixing motor 54 to perform secondary mixing, which mixes the primary mix (or additional primary mix) with the mixing materials, and produces the secondary mix.

[0115] When the secondary kneaded material is manufactured, the judgment unit 67B compares the secondary kneaded material with the control standard value of the secondary kneaded material stored in the storage unit 69, and if the secondary kneaded material does not meet the control standard value, the judgment unit 67B causes the mixer 50 to execute additional kneading control via the control unit 67A, and performs additional secondary kneading.

[0116] When the determining unit 67B determines that the secondary mixed material and the additional secondary mixed material satisfy the control standard values, the production of ultra-high strength fiber reinforced concrete or the like is completed.

[0117] Here, since the stationary concrete plant 300 automatically produces, for example, two or three batches of concrete, by setting continuous production on the control panel, the above flow for producing each batch will be executed continuously.

[0118] The display unit 68 displays a setting screen for setting various initial settings when producing concrete.

[0119] The display unit 68 further displays the time history waveform of the mixer load value when various materials are mixed by the mixer 50. The same screen of the display unit 68 plots the control reference values ​​(ranges) for the mixer load values ​​(mixing power value, mixing current value, etc.) that are set at the completion of each of the primary and secondary kneading.

[0120] The manager can check on the display unit 68 whether the primary mixing material and the secondary mixing material are within the range of the control reference value specific to each at the completion of each of the primary mixing and the secondary mixing. Here, the illustrated example is a form in which a comparison judgment is made with the control reference value specific to each at the completion of each of the primary mixing and the secondary mixing, but other forms may be applied, such as a form in which a comparison judgment with the control reference value is made only at the completion of the primary mixing, or a form in which a comparison judgment with the control reference value is made only at the completion of the secondary mixing. For example, the form may be such that the desired option can be selected from an option in which a comparison judgment with the control reference value is made at the completion of either the primary mixing or the secondary mixing, or an option in which a comparison judgment with the control reference value is made at the completion of both the primary mixing and the secondary mixing.

[0121] Next, an example of the control flow of the control device will be described with reference to FIG. 17 and FIGS. 18A to 18D.

[0122] 18A, a screen selection screen, which is an example of a setting operation screen 68A, is displayed on the display screen of the control device 60. This screen is a touch panel that allows selection of various screens such as the main screen, blending screen, timer screen, specification screen, and measurement screen. Here, the display screen may also display the mixing status inside the mixer 50 captured by a camera, video, or the like.

[0123] First, initial settings are made for concrete production. In this initial setting, for example, one batch or 1 m 3 The mixing ratio is set, the timer for adding various materials is set, the mixing time timer is set, the mixing number is set, and the mixing volume and number of times are set.

[0124] An example of the selected blending screen is shown in Figure 18B. For example, the volume setting is the mixing volume for one batch, and the number of batches is set as the number of times to mix. The S surface water setting is the surface water ratio of the sand, and the G surface water setting is the surface water ratio of the gravel. Selecting Write switches to the weighing screen, and selecting Screen Selection switches to the screen selection screen.

[0125] By selecting the timer screen on the screen selection screen, the screen switches to a kneading timer setting screen shown in Fig. 18C. The timer screen also includes a discharge timer setting screen for setting a timer waiting for material discharge to the mixer 50, but these are not shown in the drawings.

[0126] As shown in Figure 18C, when ultra-high strength fiber reinforced concrete or the like is to be manufactured and both primary and secondary mixing are required, the primary mixing time, additional primary mixing time, secondary mixing time, and additional secondary mixing time are set, and when ordinary concrete is to be manufactured, the secondary mixing time, etc. are set to zero.

[0127] The mixer gate open time sets how many seconds after the mixer gate fully open limit switch is detected that the gate will close. Additionally, mixer gate half open time 1 sets how long the mixer gate will stay in the half open 1 position, and sets the opening degree from fully closed to half open 1, half open 2, and fully open in time. Furthermore, mixer gate half open hold time 1 sets how many seconds the mixer gate will remain in the half open 1 state, and will automatically switch to half open 2 operation when the time is up.

[0128] 18D shows an example of the operation screen in the setting operation screen 68 A. This operation screen displays the setting and progress (countdown) of each kneading time, and when the kneading time section is touched, it switches to a kneading timer, and displays whether or not secondary kneading (secondary kneading) is performed, and whether or not additional kneading 1 and 2 (additional primary kneading, additional secondary kneading) is performed.

[0129] Touching All Stop will stop all measuring equipment except the mixer, and with Mixer Gate Open Auto / Off (Manual), the mixer gate will open and close automatically after mixing is complete on the automatic side, and if you do not want to open the mixer gate after mixing is complete, set it to the Off (Manual) side. After checking the slump of the primary and secondary mixed materials, the mixer gate will open and close automatically on the automatic side.

[0130] With "Additional kneading 1 start," additional kneading is started after the completion of the primary kneading, and the mixer is driven. With "Secondary kneading start," secondary kneading is started after the completion of additional kneading 1, and the mixer is driven after the kneading materials are added.

[0131] Additional kneading after the completion of secondary kneading is started by additional kneading 2 start, and the mixer is driven. Automatic discharge start starts automatic discharge from the mixer gate after the completion of additional kneading 2, and the mixer is driven at the same time.

[0132] Various settings in the control device 60 and drive control of the mixer 50 are performed using the various setting operation screens 68A described above.

[0133] Returning to FIG. 17, after various initial settings have been made as described above (step S10), the control device 60 causes the mixer 50 to perform primary kneading for a predetermined time (step S12).

[0134] At the stage when the primary mixing for a predetermined time is completed and the primary mixed material is produced, the display screen 68 of the control device 60 displays the time series data of the mixer load value during the primary mixing and the control reference value, as shown in Fig. 19. Here, Fig. 19 shows the time series data up to the point when the secondary mixing is completed, but in reality, at the point when the primary mixing is completed, only the time series data up to that point and the control reference value during the primary mixing are displayed.

[0135] In Figure 19, the mixer is driven at time t0 to start dry mixing, water is added at time t1, and then the mixing power value, which is the mixer load value, rises sharply by time t2 to reach a primary peak, after which it is visually confirmed whether the convergence value of the mixing power value falls within the set primary control reference value range until time t3, which is set as the primary kneading time. In the illustrated example, it is displayed that the convergence value falls within the primary control reference value range.

[0136] Returning to Figure 17, at the time of completion of the primary mixing, it is determined whether the primary mixing material satisfies the primary control standard value (step S14), and if it does not satisfy the primary control standard value, the control device 60 causes the mixer 50 to perform additional primary mixing (step S16).

[0137] When the additional primary mixing for a predetermined time is completed and the additional primary mixed material is produced, it is determined again whether the additional primary mixed material satisfies the primary control standard value (step S18), and if the additional primary mixed material does not satisfy the primary control standard value, the control device 60 causes the mixer 50 to perform additional primary mixing again (step S20).

[0138] On the other hand, if the additional primary kneaded material meets the primary control standard value for the mixer load value, or if the primary kneaded material already meets the primary control standard value for the mixer load value at the primary kneading stage, a predetermined amount is taken out of the primary kneaded material or the additional primary kneaded material and used as a test specimen, and a flow test is performed on the test specimen.

[0139] If the flow test results show that the test specimen meets the primary control standard value for flow value, it is determined that the primary mixing material and additional primary mixing material meet all of the primary control standard values, and it is possible to move on to secondary mixing.

[0140] As shown in Figure 19, after adding mixing materials at time t5 to the primary mixing material and additional primary mixing material that have been confirmed to meet the primary control standard values, the control device 60 causes the mixer 50 to perform secondary mixing for a predetermined period of time (step S22 in Figure 17).

[0141] At the stage when the secondary mixing for a predetermined time is completed and the secondary mixed material is produced, the display screen 68 of the control device 60 displays the time series data of the mixer load value during the secondary mixing and the control reference value, as shown in Fig. 19. In the illustrated example, after the material to be mixed is added at time t5, the mixing power value, which is the mixer load value, rises sharply by time t6 to reach a secondary peak, and then the convergence value of the mixing power value is displayed as being within the secondary control reference value range until time t7, which is set as the secondary mixing time.

[0142] Returning to FIG. 17, at the time of completion of the secondary mixing, it is determined whether the secondary mixing material satisfies the secondary control standard value (step S24), and if the secondary control standard value is not met, the control device 60 causes the mixer 50 to perform additional secondary mixing (step S26).

[0143] When the additional secondary mixing for a predetermined time is completed and the additional secondary mixed material is produced, it is determined again whether the additional secondary mixed material satisfies the secondary control standard value (step S28), and if the secondary control standard value is not satisfied, the control device 60 causes the mixer 50 to perform additional secondary mixing again (step S30).

[0144] On the other hand, if the additional secondary kneaded material meets the secondary control standard value for the mixer load value, or if the secondary kneaded material already meets the secondary control standard value for the mixer load value at the secondary kneading stage, a predetermined amount is taken out of the secondary kneaded material or the additional secondary kneaded material and used as a test specimen, and a flow test is performed on the test specimen.

[0145] If the result of the flow test shows that the test specimen meets the secondary control standard value for the flow value, it is determined that the secondary mixed material and additional secondary mixed material meet all of the secondary control standard values, and the production of ultra-high strength fiber-reinforced concrete, etc. is completed.

[0146] According to the control flow by the control device 60 shown in the figure, high quality primary kneaded materials and secondary kneaded materials can be manufactured.

[0147] Furthermore, by managing production while checking the mixer load value on the display screen 68, it is possible to prevent the mixer from shutting down due to a high load, particularly when adding and mixing materials, and to prevent breakdowns in related equipment.

[0148] Although not shown in the figures, a portable terminal such as a tablet owned by one or more managers may also have a screen similar to the display screen 68 and the setting operation screen 68A, so that a manager or the like who is located away from the mixer 50 can remotely set various settings for mixing by the mixer 50 and check the relationship between the mixer load value, etc. and the control reference value.

[0149] The above control flow by the control device 60 is executed by a program installed in the control device 60.

[0150] [Mixing material supply device] Next, an example of a material supplying device provided in a concrete plant according to each embodiment will be described with reference to Figs. 20 to 23. Fig. 20 is a perspective view showing an example of a material supplying device composed of a fiber storage device and a fiber conveying device, and Fig. 21 is a diagram showing a state in which a container, which is a fiber storage device, is contained inside a safety device constituting the material supplying device. Fig. 22 is a diagram showing a state in which the container has moved upward and is rotating above the mixer, following Fig. 20. Fig. 23 is a diagram showing a state in which the container has further rotated and is feeding material into the mixer, following Fig. 22.

[0151] The mixing material supply device 80 is a component of the stationary concrete plants 200, 300, and is an external device for supplying mixing material to the mixer 50.

[0152] As shown in Figure 20, the material supplying device 80 is erected on the road near the mixer 50 and has an elevator 84 on the upper side and an elevator stand 83 with two guide rails 85, and a container 81 in which the material to be kneaded is stored.

[0153] As shown in Figure 21, a safety net 82 that can be opened and closed is installed on the road in front of the lifting platform 83, and a predetermined amount of material to be mixed is poured into a container 81 contained inside the safety net 82. After the material to be mixed has been poured into the container 81, the safety net 82 is closed, and then the container 81 begins to be pulled upward.

[0154] An elevator 84 such as a hoist is installed above the elevator platform 83. On the other hand, two guide rails 85 are installed on the elevator platform 83 in parallel with each other and inclined upward from the road surface.

[0155] As shown in FIG. 20, the housing body 81 has an axle 81b with wheels 81d at both ends, an axle 81c with wheels 81e at both ends, and a rotating handle 81f that is rotatably attached to the housing body 81.

[0156] Two wheels 81d provided on the wheel axle 81b and two wheels 81e provided on the other wheel axle 81c are respectively movably engaged with two guide rails 85. A wire W extending from the hoist 84 is attached to a rotating handle 81f.

[0157] Here, a rotatable opening / closing lid (not shown) may be provided on the upper part of the container 81. The container 81 may also be provided with a measuring device (not shown), which stores a capacity limit value relating to the capacity limit of the kneaded material to be contained, and may be configured to issue an alarm when the contained kneaded material reaches the capacity limit value.

[0158] As shown in Fig. 21, for example, after one batch of material to be mixed has been charged into the container 81, the hoist 84 is driven as shown in Fig. 20, and the container 81 is pulled in the Z1 direction above the charging port of the mixer 50 along two guide rails 85 via a wire W. As shown in Fig. 20, of the two wheel shafts 81b and 81c, the wheel shaft 81b is located at the front in the direction of movement.

[0159] As shown in Figure 20, each guide rail 85 has two branch rails 86a, 86b that branch off in two directions above it, and the lower guide rail 85 and the two-way branch rails 86a, 86b form a Y-shaped rail when viewed from the front.

[0160] 22, when the container 81 is pulled upward, the two wheels 81d of the wheel shaft 81b located at the front in the direction of movement enter in the Z2 direction into the branch rail 86a on the mixer 50 side located above each guide rail 85. At this stage, the two wheels 81e of the wheel shaft 81c located at the rear in the direction of movement are located midway along each guide rail 85.

[0161] The container 81 is pulled further upward, and the two wheels 81d reach the tip of the branch rail 86a, causing the wheel axle 81b to stop first.

[0162] When the container 81 is pulled further upward, the container 81 rotates in the Z3 direction around the wheel axle 81b, which is stopped first.

[0163] As shown in FIG. 23, as the container 81 rotates further, the two wheels 81e of the wheel shaft 81c located at the rear in the moving direction move into the other branched rail 86b in the Z4 direction.

[0164] Then, when the container 81 is pulled further upward, the container 81 is further rotated around the wheel axle 81b as the center of rotation, and when the two wheels 81e reach the tip of the branch rail 86b, the container 81 is further rotated in the Z5 direction, and the entire amount of the mixing material contained in the container 81 is poured into the mixer 50.

[0165] After the mixing material is added to the mixer 50, the hoist 84 is released and the container 81 is gradually lowered along the two guide rails 85 and returned to the inside of the safety device 82, thereby preparing to add the next batch of mixing material.

[0166] The material supplying device 80 is a device with a relatively simple configuration that does not require a large occupation area, and can realize efficient feeding of the material to be kneaded into the mixer 50.

[0167] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0168] 10: Transport vehicle 11: Cargo bed 15: Outrigger 16: Jack 18: Generator 20, 20A, 20B: Plant unit 21: Frame structure 22:Work Stage 23: Handrail 25: Mixer stand 26: Rail 27:Support leg 28:Support leg 29: Wheels 31A: Coarse aggregate storage device (aggregate storage device) 31B: Fine aggregate storage device (aggregate storage device) 32A: Coarse aggregate inlet (aggregate inlet) 32B: Fine aggregate inlet (aggregate inlet) 33A: Coarse aggregate storage hopper 34A: Coarse aggregate transport device (aggregate transport device, belt conveyor) 34B: Fine aggregate transport device (aggregate transport device, belt conveyor) 35: Powder storage device 36:Powder inlet 38: Powder conveying device (screw conveyor) 41: Water tank 42: Supply pipe 43a: Supply pump 43b:Flowmeter 43c: On-off valve 45: Additive tank 46: Supply pipe 47a: Supply pump 47b:Flow meter 47c: On-off valve 50: Mixer 51: Mixer body 51a: Blade 51b: Load cell 52a, 52b, 52c, 52d, 52e, 52f: Receiving ports 53a, 53b, 53c, 53d: On-off valves 54: Mixing motor 55: Slide jig (endless roller) 55a: Jig body 55b: Koro 56: Falling prevention means 57: Stopper 58: Anti-jump cover 60: Control device 67: Communications Department 67A: Control unit 67B: Judgment section 68: Display section (display screen) 68A: Setting operation screen 69: Storage area 71A: External coarse aggregate storage device (external aggregate storage device) 71B: External fine aggregate storage device (external aggregate storage device) 74A: External coarse aggregate transport device (external aggregate transport device, belt conveyor) 74B: External fine aggregate transport device (external aggregate transport device, belt conveyor) 75: External powder storage device 78: External powder conveying device (screw conveyor) 80: Mixing material supply device 81: Mixing material storage device (external mixing material storage device, container) 81b, 81c: Wheel axle 81d, 81e: Wheels 81f: Rotating handle 82: Safety measures 83: Mixing material transport device (external mixing material transport device, lifting stand) 84: Elevator (hoist) 85: Guide rail 86a, 86b: Branch rails 100: On-board concrete plant 200, 300: Stationary concrete plant W: Wire L: Lever block C: Chain R: Road surface

Claims

1. A transport vehicle, a concrete plant unit that is loaded onto the bed of the transport vehicle and transported by the transport vehicle, the plant unit having at least a frame structure that includes an aggregate storage device and an aggregate transport device therein during transportation; a mixer that is not included in the plant unit during transportation but becomes a component of the plant unit during concrete production; a mixer stand that is provided behind the plant unit located behind the loading platform and supports the mixer at least during the concrete production; A rail is provided on the mixer stand, The mixer is provided with a slide jig below it, A concrete plant characterized in that the mixer mounted on the mixer stand, which is located in a position extending rearward from the loading platform, moves to a mixing position while sliding the slide jig along the rail.

2. 2. The concrete plant according to claim 1, wherein the slide jig is formed of an endless roller.

3. 3. The concrete plant according to claim 1, wherein the slide jig is provided with a means for preventing the slide jig from falling off the rail.

4. 4. The concrete plant according to claim 1, wherein the slide jig is fixed to the rail via a stopper at the mixing position.

5. The mixer stand is pre-installed behind the plant unit located behind the loading platform, 5. The concrete plant according to claim 1, wherein the mixer stand rotates or slides from a position in which it is housed in the loading platform to extend rearward from the loading platform, thereby forming a supporting position for the mixer.

6. The mixer stand is pre-installed behind the plant unit located behind the loading platform, 5. A concrete plant according to claim 1, wherein the plant unit is slidably mounted on the loading platform, and the mixer stand extends behind the loading platform in response to the sliding of the plant unit, thereby forming a support posture for the mixer.

7. 7. The concrete plant according to claim 5, further comprising support legs for supporting the mixer platform, the support legs extending rearward from the loading platform.

8. 8. A concrete plant according to claim 7, characterized in that the support legs are equipped with wheels.

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