A three-level precise transportation scheduling control method and system for smart construction sites

Abstract

The present invention provides a three-level precise transportation scheduling control method and system for smart construction sites. The cargo scheduling is divided into three-level scheduling according to the transportation sequence of cargo on the construction site. The entry rate and exit rate in the second and third level scheduling in the current period are calculated. The entry rate, exit rate, number of vehicles and capacity of the construction area are used to judge the stable state of the construction. The entry rate of the construction area is optimized through corresponding optimization directions and strategies, the number of vehicles in the construction area is kept within the capacity of the construction area, and the efficiency of the construction area is improved; the exit rate and entry rate of the waiting area are optimized, the number of waiting trucks and the waiting time in the waiting area are reduced, and the traffic organization of the construction area is facilitated; the truck driver's needs to be changed are judged according to the optimized entry rate of the waiting area, and the arrival time, speed and rest time are recommended to the manufacturer and the driver to guide the truck to arrive, and the truck manufacturer and the driver can take corresponding measures based on this.

Description

Technical Field

[0001] The present invention relates to the field of construction site traffic scheduling, and in particular to a three-level precise transportation scheduling control method and system for smart construction sites. Background Art

[0002] With the rapid, sustained, stable and coordinated development of my country's economy, many major engineering projects are in full swing. In order to improve the economic benefits of the project and reduce the investment in manpower and material resources during the construction period, engineering projects often face problems such as short construction period and tight road land in the construction area. Short construction period or tight road land often leads to a large number of trucks arriving, high traffic volume in the construction area, large-scale occupation of the construction area, obstruction of vehicle traffic, low efficiency of cargo transportation in the construction area, and even traffic paralysis in the construction area, which brings great difficulties to the traffic organization of the construction area.

[0003] Blindly dispatching goods and arranging trucks to enter the site will cause a waste of manpower and material resources, and will also cause a large number of trucks to be parked and invalid, or cause no trucks to arrive and enter the site, resulting in idle construction areas. Therefore, how to reasonably dispatch goods will be particularly important. However, there is currently a lack of control methods for accurate dispatching of goods. The existing methods cannot dynamically adjust the entry and exit rates of the construction area and the waiting area, control the number of vehicles in the construction area to be close to the capacity of the construction area, and maintain high-efficiency operation; cannot control the number of trucks in the waiting area to prevent emergencies; cannot dynamically adjust the arrival time of each truck according to the conditions of the construction area and the waiting area, and notify the cargo manufacturers and truck drivers of the latest arrival time, recommended arrival time, speed and rest time of each truck. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies of the above-mentioned prior art, the present invention is based on the entry and exit rates of the waiting area and the construction area, and optimizes the entry and exit rates of the construction area and the waiting area by judging the stable state of the construction area, notifying the latest arrival time and the recommended arrival time to the goods manufacturer to delay or advance the delivery time, notifying the truck to adjust the arrival time, and guiding the truck to reduce or increase the speed, increase or reduce the rest time. The three-level scheduling of the present invention makes the random process of manufacturer delivery, truck arrival and truck entry in cargo scheduling precisely controllable, avoiding the situation where trucks arrive early but have no place to unload, and are late to affect the progress of the project, avoiding the situation where trucks arrive in advance and cause heavy traffic pressure in the construction area and no trucks arrive to delay the construction period, while reducing the number of waiting trucks and waiting time in the waiting area, improving the efficiency of the construction area, and facilitating the organization of truck traffic.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A three-level precise transportation scheduling control method for a smart construction site, the method comprising the following steps:

[0007] (A) Cargo dispatch is divided into three levels according to the transportation sequence of construction site cargo;

[0008] (B) Determine the ideal number of waiting areas, number of vehicles in the waiting areas, entry rate and exit rate of each waiting area in the second-level scheduling, and the capacity of the construction area, number of vehicles in the construction area, entry rate and exit rate of the third-level scheduling according to the current scheduling situation;

[0009] (C) Grouping trucks according to their destination waiting areas, calculating the expected arrival time of each truck, sorting the trucks in each group according to their expected arrival time, and calculating the expected departure time (i.e., the time to leave the waiting area) of each truck;

[0010] (D) Calculate the adjustment rate of the construction area, determine the stable state of the construction area in the third-level scheduling, and after determining the optimization direction, calculate the entry rate of the optimized construction area, the exit rate and entry rate of the optimized waiting area;

[0011] (E) Calculate the latest arrival time, recommended arrival time, recommended speed, and recommended rest time of trucks in the first-level scheduling.

[0012] Furthermore, step (A) divides the cargo dispatching into three levels according to the transportation sequence of the construction site cargo, and each dispatching level is commanded by the dispatching center: the first level is between the cargo manufacturer and each truck waiting area. This level accounts for the largest proportion of the time in cargo transportation. The dispatching center can contact the shipping manufacturer and control the shipping time or contact the driver to control the arrival time; the second level dispatching is between each truck waiting area and the entrance of the construction area. The trucks at this level are strictly controlled by the dispatching center, and the dispatching center guides them to enter the construction area to unload according to the arrival order; the third level dispatching is between the entrance and the exit of the construction area. After unloading is completed, the dispatching center guides the trucks to leave the construction area.

[0013] Further, in step (B):

[0014] The ideal number of waiting areas in the i-th waiting area is CT i The ideal number of waiting areas is to avoid the situation where the construction area is idle when the unloading progress is ahead of schedule but the trucks have not arrived. Therefore, it is necessary to ensure that there are at least CT in the waiting area. i The number of vehicles waiting in the waiting area at the current moment is NT i , according to the recorded data, the entry rate TIP of the i-th waiting area can be calculated i , the calculation formula is as follows:

[0015]

[0016] ΔT is the unit statistical duration, and the dispatch center collects data every ΔT; NTI i is the number of vehicles entering the i-th waiting area during the most recent unit statistical time;

[0017] The attendance rate of the i-th waiting area TOP i The calculation formula is as follows:

[0018]

[0019] Among them, NTO i is the number of vehicles that left the i-th waiting area during the most recent unit statistical time;

[0020] The capacity of the construction area is CS, which refers to the maximum number of unloading vehicles that the construction area can accommodate at the same time. The number of vehicles unloading in the construction area at the current moment is NS. Trucks leaving the waiting area in the second-level dispatch will immediately enter the construction area in the third-level dispatch for unloading. The total number of trucks leaving the waiting area is exactly equal to the number of trucks entering the construction area; then the calculation formula for the construction area entry rate SIP is as follows:

[0021]

[0022] The calculation formula for the construction area's appearance rate SOP is as follows:

[0023]

[0024] NSO is the number of vehicles that left the construction area during the most recent unit statistical time.

[0025] Furthermore, in step (C), the trucks are grouped according to their destination waiting areas, and the expected arrival time, arrival order, and expected departure time of each truck are calculated. In this step, the rest time Tx of the pth truck is p is the time for the truck to rest and adjust on the highway, and its average speed is v p , the distance between the truck’s current location and the waiting area is L p , then the expected arrival time of the pth truck is T p It can be calculated by the following formula:

[0026]

[0027] In the grouping by waiting area, the trucks are sorted in ascending order according to their expected arrival time. The sorting order j is their arrival order. If the pth truck goes to the i-th waiting area and is ranked as the jth truck in the i-th group, then its number is i#-(j+NT i ) Put the NT in the waiting area i The trucks are sorted in order of arrival, and the truck with order k is numbered i#-k.

[0028] Expected departure time of truck I#-k Tw i,k It can be calculated according to the following formula:

[0029]

[0030] Truck i#-(j+NT i )'s expected appearance time It can be calculated according to the following formula:

[0031]

[0032] Further, step (D) determines the stable state of the construction area in the third-level scheduling, and determines the optimization direction, calculates the construction area regulation rate, the optimized construction area entry rate, the optimized waiting area exit rate and entry rate step. SOP represents the speed of unloading. Since it is mainly affected by the number of machines and the number of workers, it will not change in a short time. The stable state of the construction area is determined according to the entry rate and exit rate of the construction area. Its state is divided into temporary stable state and unstable state. Its judgment condition and optimization direction are related to the construction area regulation rate. The construction area regulation rate can be calculated using the following formula:

[0033]

[0034] If ΔSP<0, the stable state of the construction area is unstable. Maintaining this state for a long time will cause congestion, high load or even overload operation of unloading machines and personnel, and collapse of construction area management. Therefore, the only optimization direction to be considered in this state is to reduce the entry rate SIP of the construction area and the exit rate TOP of the waiting area. i .

[0035] If ΔSP≥0, the stable state of the construction area is a temporary steady state. In this state, the construction area can operate stably, but a large ΔSP will lead to low efficiency of the construction area and increase the manpower and material costs of construction. Therefore, the optimization direction is to increase the entry rate SIP of the construction area and the exit rate TOP of the waiting area. i .

[0036] According to the above optimization direction, the construction area entry rate and the waiting area exit rate are optimized, which can improve the efficiency and utilization rate of the construction area. The optimized construction area entry rate SIP′ and the optimized waiting area exit rate TOP′ i The calculation formula is as follows:

[0037] SIP′=SIP+ΔSP

[0038]

[0039] Where Sn is the number of waiting areas.

[0040] After the waiting area exit rate is optimized, the waiting area entry rate also needs to be optimized. The calculation formula for the optimized waiting area entry rate is as follows;

[0041]

[0042] Furthermore, in step (E) of calculating the latest arrival time, recommended arrival time, recommended speed and recommended rest time of the truck in the first-level dispatch, according to the optimized second-level dispatch and third-level dispatch, it is necessary to inform the truck driver of the latest arrival time in the first-level dispatch, and the truck i#-(j+NT i )'s latest arrival time It can be calculated as follows:

[0043]

[0044] At the same time, the trucks are guided, and the guidance mainly takes the form of recommending arrival time, running speed and rest time to the truck drivers or notifying the manufacturers to change the delivery time. i )'s recommended arrival time It can be calculated as follows:

[0045]

[0046] 1) If Then the dispatch center contacts the truck i#-(j+NT i ) driver, it is recommended that the truck driver should follow the following recommended speed The recommended speed can be calculated as follows:

[0047]

[0048] in For trucks i ) Current running speed, For trucks i )The distance between your current location and the waiting area.

[0049] 2) If Then the dispatch center contacts the truck i#-(j+NT i ) is recommended for drivers of trucks to rest in service areas. The recommended rest time can be calculated according to the following formula:

[0050]

[0051] Beneficial effects:

[0052] The present application provides a three-level precise transportation scheduling control method and system for smart construction sites. Compared with the prior art, the present invention has the following advantages:

[0053] 1) Compared with other construction cargo dispatching methods, the cargo dispatching process is divided into three levels. The third-level dispatching between the waiting area and the entrance of the construction area controls the efficiency of the construction area. The second-level dispatching between the entrance and exit of the construction area accurately arranges the waiting and entry positions and times of trucks. The first-level dispatching between the cargo plant and each truck waiting area adjusts the departure and arrival times of trucks.

[0054] 2) Compared with other construction cargo dispatching methods, the stable state of the construction area is divided into temporary stable state and unstable state. By judging the stable state of the construction area, the construction area entry rate is optimized to ensure that the number of vehicles in the construction area is close to the capacity of the construction area, and the construction area is maintained at a high efficiency;

[0055] 3) Compared with other methods of construction cargo dispatching, by optimizing the entry rate and exit rate of the waiting area, the number of vehicles in the waiting area is kept basically at the ideal waiting number, which not only ensures that the waiting trucks reduce the land occupation, but also reduces the waiting time of the trucks, and also ensures that there are always trucks to enter the construction area;

[0056] 4) Compared with other methods of construction cargo scheduling, the arrival time of trucks is dynamically adjusted according to the optimized entry rate of the waiting area, the latest arrival time of the driver is specified, and the arrival time, arrival speed and rest time are recommended to the driver, so that the time of truck departure, arrival and entry into the construction area is accurately controllable, avoiding the randomness of the entire scheduling process, avoiding the situation where the concentrated arrival of trucks causes heavy traffic pressure in the construction area and the delay of the construction period due to the lack of trucks arriving, while reducing the number of waiting trucks and waiting time in the waiting area, improving the efficiency of the construction area, and facilitating the organization of truck traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to make the present invention easier to understand, the present invention will be described in detail below based on specific examples of the present invention in conjunction with the accompanying drawings, wherein

[0058] Figure 1 The flowchart is a three-level precise transportation scheduling control method and system for smart construction sites. DETAILED DESCRIPTION

[0059] The present invention is further described below based on an example.

[0060] In one embodiment, a three-level precise transportation scheduling control method for smart construction sites is provided; the cargo scheduling is divided into three levels according to the transportation sequence of the cargo on the construction site, the entry rate and exit rate in the second and third levels of scheduling in the current period are calculated, and the entry rate, exit rate, number of vehicles and capacity of the construction area are used to judge the stable state of the construction; the entry rate of the construction area is optimized through corresponding optimization directions and strategies, the number of vehicles in the construction area is kept within the capacity of the construction area, and the efficiency of the construction area is improved; the exit rate and entry rate of the waiting area are optimized, the number of waiting trucks and the waiting time in the waiting area are reduced, and the traffic organization of the construction area is facilitated; the truck driver's needs to be changed are judged according to the optimized entry rate of the waiting area, and the arrival time, speed and rest time are recommended to the manufacturer and the driver to guide the truck to arrive, and the truck manufacturer and the driver can take corresponding measures based on this. The random process of manufacturer shipment, truck arrival and truck entry in cargo scheduling becomes precisely controllable, avoiding the situation where trucks arrive early but there is no place to unload, or are late and affect the progress of the project, and avoiding the situation where trucks arrive in large numbers and cause heavy traffic pressure in the construction area and no trucks arrive and delay the construction period. At the same time, it reduces the number of waiting trucks and the waiting time in the waiting area, improves the efficiency of the construction area, and facilitates the organization of truck traffic.

[0061] In one embodiment, Figure 1 As shown, a three-level precise transportation scheduling control method for smart construction sites includes the following steps:

[0062] (A) Cargo dispatch is divided into three levels according to the transportation sequence of construction site cargo;

[0063] (B) Determine the ideal number of waiting areas, number of vehicles in the waiting areas, entry rate and exit rate of each waiting area in the second-level scheduling, and the capacity of the construction area, number of vehicles in the construction area, entry rate and exit rate of the third-level scheduling according to the current scheduling situation;

[0064] (C) Grouping trucks according to their destination waiting areas, calculating the expected arrival time of each truck, sorting the trucks in each group according to their expected arrival time, and calculating the expected departure time (i.e., the time to leave the waiting area) of each truck;

[0065] (D) Calculate the adjustment rate of the construction area, determine the stable state of the construction area in the third-level scheduling, and after determining the optimization direction, calculate the entry rate of the optimized construction area, the exit rate and entry rate of the optimized waiting area;

[0066] (E) Calculate the latest arrival time, recommended arrival time, recommended speed, and recommended rest time of trucks in the first-level scheduling.

[0067] In one embodiment, a three-level precise transportation scheduling and control system for smart construction sites is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned three-level precise transportation scheduling and control method for smart construction sites when executing the computer program.

[0068] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned three-level precise transportation scheduling control method for smart construction sites are implemented.

[0069] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0070] In one embodiment, at a certain moment, the construction area capacity of the construction area is 10 and there are 9 trucks in the current construction area. Two truck waiting areas are arranged outside the construction area. The ideal number of waiting areas in waiting area 1 is 6, and the ideal number of waiting areas in waiting area 2 is 8. Table 1 shows the number of trucks entering and leaving the construction area and the waiting area in the first 20 minutes recorded by the dispatch center:

[0071] Table 1

[0072] Number of entries Appearances Number of vehicles in the venue Construction Zone 5 3 9 Waiting Area 1 3 2 5 Waiting Area 2 2 3 9

[0073] The data of trucks heading to the waiting area is shown in Table 2:

[0074] Table 2

[0075] Go to the waiting area Distance to the waiting area (km) Speed ​​(km / h) Rest time (h) Truck 1 1 10 70 0 Truck 2 1 15 70 0.1 Truck 3 1 35 61 0 Truck 4 2 8 77 0 Truck 5 2 18 65 0 Truck 6 2 25 72 0.2 Truck 7 2 35 74 0.2

[0076] (A) According to the transportation sequence of the goods on the construction site, the cargo dispatch is divided into three levels of dispatch steps. Each dispatch level is commanded by the dispatch center. The first level is between the cargo factory and each truck waiting area. The dispatch center can contact the shipping yard to control the delivery time or contact the driver to control the arrival time; the second level dispatch is between each truck waiting area and the entrance of the construction area, including waiting area 1 and waiting area 2. The trucks in this level are strictly controlled by the command center. The dispatch center guides them to enter the construction area to unload according to the arrival order; the third level dispatch is between the entrance and exit of the construction area. After unloading, the dispatch center guides the vehicles to leave the construction area;

[0077] (B) According to the current scheduling situation, determine the ideal number of waiting areas, the number of vehicles in the waiting area, the entry rate and the exit rate of each waiting area in the second-level scheduling, and the capacity of the construction area, the number of vehicles in the construction area, the entry rate and the exit rate of the third-level scheduling. The unit statistical time

[0078] The ideal number of waiting areas in waiting area 1 is CT1=6, the number of waiting vehicles is NT1=5, the number of vehicles entering waiting area 1 in the last 20 minutes is NTI1=3, and the number of vehicles entering waiting area 1 in the last 20 minutes is NTI1=2;

[0079] The ideal number of waiting areas in waiting area 2 is CT2 = 8, the number of waiting vehicles is NT2 = 9, the number of vehicles entering waiting area 2 in the last 20 minutes is NTI2 = 2, and the number of vehicles entering waiting area 2 in the last 20 minutes is NTI2 = 3. According to the recorded data, the entry rate TIP of the i-th waiting area can be calculated i And the appearance rate TOP i , the calculation model is as follows:

[0080]

[0081]

[0082] Waiting Area 1:

[0083]

[0084]

[0085] Waiting Area 2:

[0086]

[0087]

[0088] The capacity of the construction area CS = 10. The number of vehicles unloading in the construction area at the current moment NS = 9. According to the calculation model, the entry rate SIP of the construction area can be obtained:

[0089]

[0090] The number of vehicles that left the construction area in the last 20 minutes, NSO = 3. According to the calculation model, the exit rate SOP of the construction area can be obtained:

[0091]

[0092] (C) Group the trucks according to their destination waiting areas and calculate the expected arrival time, arrival order, and expected departure time of each truck. In this step, the expected arrival time T of the pth truck is p It can be calculated by the following model:

[0093]

[0094] Taking truck 1 as an example, the calculation results of other trucks are shown in the following table:

[0095]

[0096] In the grouping by waiting area, the trucks are sorted in ascending order according to their expected arrival time. Truck 1 will be the first truck to arrive in waiting area 1, and its arrival order is 1, so its number is 1#-(1+5). The numbers of other trucks are shown in Table 3:

[0097] Table 3

[0098] Go to the waiting area Expected arrival time (h) Arrival Order serial number Truck 1 1 0.14 1 1#-(1+5) Truck 2 1 0.31 2 1#-(2+5) Truck 3 1 0.57 3 1#-(3+5) Truck 4 2 0.1 1 2#-(1+9) Truck 5 2 0.28 2 2#-(2+9) Truck 6 2 0.55 3 2#-(3+9) Truck 7 2 0.67 4 2#-(4+9)

[0099] The NT in the waiting area i The trucks are sorted in order of arrival, and the truck with order k is numbered i#-k; the expected departure time of truck i#-k is Tw i,k It can be calculated according to the following model:

[0100]

[0101] There are currently NT1=5 vehicles waiting in waiting area 1. The last vehicle is numbered 1#-5 and its expected exit time is Tw 1,5 for:

[0102]

[0103] There are currently NT2 = 9 vehicles waiting in waiting area 2. The fifth vehicle to arrive is numbered 2#-5, and its expected departure time is Tw 2,5 for:

[0104]

[0105] Truck i#-(j+NT i )'s expected appearance time Tw i,k It can be calculated according to the following model:

[0106]

[0107] Expected departure time of truck 1-(1+5) Tw 1,(1+5) It can be calculated according to the following model:

[0108]

[0109] (D) Determine the stable state of the construction zone in the third-level scheduling, determine the optimization direction, calculate the construction zone adjustment rate, the optimized construction zone entry rate, the optimized waiting zone exit rate and entry rate. The stable state of the construction zone is determined according to the entry rate and exit rate of the construction zone. The state is divided into temporary stable state and unstable state. The judgment conditions and optimization direction are related to the construction zone adjustment rate. The construction zone adjustment rate can be calculated using the following model:

[0110]

[0111] ΔSP<0, it is judged that the stable state of the construction area is unstable. Maintaining this state for a long time will cause congestion, high load or even overload operation of unloading machines and personnel, and collapse of construction area management. Therefore, the only optimization direction to be considered is to reduce the entry rate SIP of the construction area and the exit rate of the waiting area.

[0112] The optimized construction area entry rate sip′ and the optimized waiting area exit rate TOP′ i as follows:

[0113] SIP′=SIP+ΔSP=15-3=12 vehicles / h

[0114]

[0115]

[0116] After the waiting area exit rate is optimized, the waiting area entry rate also needs to be optimized. The optimized waiting area entry rate is shown below;

[0117]

[0118]

[0119] (E) In the step of calculating the latest arrival time, recommended arrival time, recommended speed and recommended rest time of the truck in the first-level dispatch, the latest arrival time of the truck driver in the first-level dispatch needs to be informed according to the optimized second-level dispatch and third-level dispatch;

[0120] Taking truck 1#-(1+5) as an example, its latest arrival time is for:

[0121]

[0122] Other trucks As shown in the following table.

[0123] At the same time, the trucks are guided, and the guidance mainly takes the form of recommending arrival time, running speed and rest time to the truck drivers or notifying the manufacturers to change the delivery time. i )'s recommended arrival time It can be calculated according to the following model:

[0124]

[0125] 1) Taking truck 1#-(1+5) as an example, its recommended arrival time for:

[0126]

[0127] because Recommended speed The driving is as follows:

[0128]

[0129] The dispatch center then contacts the drivers of trucks 1#-(1+5) and recommends that the drivers Arrive at Waiting Area 1 and increase the speed to the recommended speed

[0130] 2) Taking truck 2#-(3+9) as an example, its recommended arrival time for:

[0131]

[0132] because It is recommended that truck drivers 2#-(3+9) take a rest in the service area. The recommended rest time is as follows:

[0133]

[0134] The dispatch center then contacted the driver of truck 2#-(3+9) and recommended that the driver rest in a service area for 0.32 hours and arrive at waiting area 2 after 0.67 hours.

[0135] The above description is only a specific implementation of the present invention in an embodiment, but the protection scope of the present invention is not limited thereto. Any person familiar with the technology can understand and think of any changes or substitutions within the technical scope disclosed by the present invention, which should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A three-level precise transportation scheduling control method for smart construction sites, characterized in that: The method comprises the following steps: (A) Cargo dispatch is divided into three levels according to the transportation sequence of construction site cargo; (B) Determine the ideal number of waiting areas, number of vehicles in the waiting areas, entry rate and exit rate of each waiting area in the second-level scheduling, and the capacity of the construction area, number of vehicles in the construction area, entry rate and exit rate of the third-level scheduling according to the current scheduling situation; (C) Grouping trucks according to their destination waiting areas, calculating the expected arrival time of each truck, sorting the trucks in each group according to the expected arrival time, and calculating the expected departure time of each truck; (D) Calculate the adjustment rate of the construction area, determine the stable state of the construction area in the third-level scheduling, and after determining the optimization direction, calculate the entry rate of the optimized construction area, the exit rate and entry rate of the optimized waiting area; (E) Calculate the latest arrival time, recommended arrival time, recommended speed and recommended rest time of trucks in the first-level dispatch; In step (A), cargo dispatch is divided into three levels according to the transportation sequence of the construction site cargo: The first level of dispatch is between the goods manufacturer and each truck waiting area. This level takes up the largest time in the transportation of goods. The dispatch center can contact the goods manufacturer to control the delivery time or contact the truck driver to control the arrival time at the waiting area. The second level of dispatching is between the waiting area for each truck and the entrance to the construction area. The trucks at this level are controlled by the dispatching center, which guides the trucks into the construction area to unload according to the arrival order. The third level of dispatch is between the entrance and exit of the construction area. After unloading is completed, the dispatch center guides the truck to leave the construction area; In the step (D), the stable state of the construction area is determined according to the entry rate and exit rate of the construction area. The state is divided into a temporary stable state and an unstable state. The judgment condition and optimization direction are related to the adjustment rate of the construction area. The adjustment rate of the construction area is calculated using the following formula: Among them, CS is the capacity of the construction area, NS is the number of vehicles unloading in the construction area at the current moment, ΔT is the unit statistical time, SIP is the entry rate of the construction area, and SOP is the exit rate of the construction area; If ΔSP<0, the stable state of the construction area is unstable. In this state, the optimization direction is to reduce the entry rate of the construction area and the exit rate of the waiting area. If ΔSP≥0, the stable state of the construction area is a temporary stable state. In this state, the optimization direction is to increase the entry rate of the construction area and the exit rate of the waiting area; According to the optimization direction, the construction area entry rate and the waiting area exit rate are optimized. The optimized construction area entry rate SIP′ and the optimized waiting area exit rate TOP′ i The calculation formula is as follows: SIP′=SIP+ΔSP Where SIP′ is the optimized construction area access rate, TOP′ i is the appearance rate of the i-th waiting area after optimization, and n is the number of waiting areas; The calculation formula for the entry rate of the waiting area after optimization is as follows; Among them, TIP′ i is the optimized entry rate of the i-th waiting area, CT i is the ideal number of waiting areas in the i-th waiting area, NT i is the number of waiting vehicles in the i-th waiting area at the current moment.

2. A three-level precise transportation scheduling control method for a smart construction site as claimed in claim 1, characterized in that: In the step (B) The entry rate TIP of the i-th waiting area i The calculation formula is as follows: Where ΔT is the unit statistical duration; NTI i is the number of vehicles entering the i-th waiting area during the most recent unit statistical time; Calculate the TOP attendance rate of the i-th waiting area i The calculation formula is as follows: Among them, NTO i is the number of vehicles that left the i-th waiting area during the most recent unit statistical time; The calculation formula for the construction area entry rate SIP is as follows: The calculation formula for the construction area appearance rate SOP is as follows: NSO is the number of vehicles that left the construction area during the most recent unit statistical time.

3. A three-level precise transportation scheduling control method for a smart construction site as claimed in claim 1, characterized in that: In the step (C): The expected arrival time of the pth truck is T p The calculation formula is as follows: Among them, Tx p is the rest time of the pth truck, v p is the average speed of the p-th truck, L p is the distance between the current position of the p-th truck and the waiting area; In the grouping by waiting area, the trucks are sorted in ascending order according to their expected arrival time, and the NT i The trucks are sorted according to the order of arrival; the expected departure time Tw of the truck with arrival order k in the i-th waiting area i,k Calculated according to the following model: The expected departure time of the truck with the serial number j in the corresponding group heading to the i-th waiting area Calculated according to the following formula: Among them, NT i is the number of waiting vehicles in the i-th waiting area at the current moment, TOP i is the attendance rate of the i-th waiting area at the current moment.

4. A three-level precise transportation scheduling control method for a smart construction site as claimed in claim 1, characterized in that: In step (E), the latest arrival time, recommended arrival time, recommended speed and recommended rest time of the truck with sequence number j in the corresponding group heading to the i-th waiting area in the first-level scheduling are calculated as follows: The latest arrival time of the truck Recommended arrival time The following formula is used to calculate: like The dispatch center then contacts the truck driver and recommends that the truck driver drive at the following recommended speed: Calculated according to the following formula: in is the running speed of the truck at the current moment, is the distance between the truck and the waiting area at the current moment; like The dispatch center will contact the truck driver and recommend that the truck driver take a rest in the service area first, and recommend a rest time. Calculated according to the following formula:

5. The three-level precise transportation scheduling control method for smart construction sites as claimed in claim 1, characterized in that: The truck is equipped with a positioning system and a communication system to share its location and speed information in real time. The dispatch center communicates with the truck driver through the communication system and synchronizes the recommended arrival time, recommended speed, and recommended rest time to the truck driver.

6. A three-level precise transportation dispatching control system for a smart construction site, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the three-level precise transportation scheduling control method for smart construction sites described in any one of claims 1 to 5 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the three-level precise transportation scheduling control method for smart construction sites described in any one of claims 1 to 5 are implemented.

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