Construction control method and system based on concrete cold seam fine detection

Abstract

The invention discloses a construction control method and system based on concrete cold seam fine detection, and the method comprises the steps: collecting a concrete mixture loading moment of a transport vehicle, recording a time interval with next concrete mixture pouring in real time, precisely calculating the initial setting time of a concrete mixture, and judging whether a cold seam is generated or not; meanwhile, the falling center coordinate and the pouring flow during pouring of the concrete mixture are collected, the space information of the concrete mixture is calculated according to the falling center coordinate and the pouring flow, and the area where the cold joints possibly occur can be accurately positioned. The concrete pouring time of each position can be finely controlled, cold joints of a mixture are prevented from being formed, and the construction quality and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of concrete construction, and in particular to a construction control method and system based on the refined detection of cold joints in concrete. Background Technology

[0002] Concrete, as one of the most widely used materials in modern construction engineering, directly affects the durability and safety of structures through its construction quality. However, due to negligence in on-site management during construction, discontinuous construction results in excessively long intervals between pouring concrete mixtures in different areas of the structure. Furthermore, the interval between pouring new and old concrete exceeds the initial setting time of the old concrete, leading to weak bonding surfaces between the two, i.e., cold joints. Currently, construction workers prevent cold joint formation by controlling the pouring interval of the concrete mixture. However, the pouring location and timing during construction rely heavily on the subjective control of workers. Moreover, the initial setting time of concrete changes in real time with ambient temperature, making precise control of the pouring interval impossible, resulting in low efficiency and impacting construction quality and progress. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a construction control method and system based on the refined detection of cold joints in concrete, which ensures high construction quality.

[0004] Technical solution: The construction control method based on refined detection of cold joints in concrete as described in this invention includes the following steps:

[0005] The time of loading of concrete mixture into the transport vehicle is collected, and the time interval ΔT between the next concrete mixture pour is recorded in real time.

[0006] After the concrete mix is ​​loaded from the transport truck into the pump truck, the temperature t of the concrete mix upon entry into the pump truck is collected, and the initial setting time T of the concrete mix at temperature t is calculated. t ;

[0007] The center coordinates of the concrete mixture during pouring and the pouring flow rate are collected. Based on the center coordinates of the concrete mixture and the pouring flow rate, the spatial information of the concrete mixture is calculated to determine the area of ​​the cold joint to be detected.

[0008] When ΔT < T t When no cold joint is generated, the next layer of concrete mixture is poured in the area where the cold joint to be detected is located; when ΔT > T t When pouring concrete, roughen and / or install reinforcing bars in the area where cold joints are to be inspected before pouring the next layer of concrete mixture.

[0009] Furthermore, the initial setting time T of the concrete mixture at temperature t t =T 20 ·e k(t-20);

[0010] Where T 20 is the initial setting time of the concrete mixture when the temperature upon entering the placement chamber is 20℃, and k is a temperature coefficient obtained by fitting the experimental results.

[0011] Furthermore, an RTK positioning device is installed on the robotic arm of the pump truck to collect the coordinates of the falling center during pouring, and a flow meter is installed inside the hose of the pump truck to collect the pouring flow rate Q.

[0012] Calculate the pouring volume V based on the pouring flow rate:

[0013]

[0014] Where Q(i) is the pouring flow rate detected by the flow meter in the i-th time, n is the total number of times the flow meter detects the flow, and f is the flow meter detection frequency;

[0015] Calculate the pouring height H and pouring spread D of the concrete mixture based on the pouring volume V:

[0016] H=Aln(V)+B, D=Cln(V)+D;

[0017] Where A and B are the pouring height coefficients, and C and D are the pouring expansion coefficients, which are obtained by fitting the test results;

[0018] Based on the concrete pouring frustum model fitted at the center coordinates of the fall, using the pouring volume, pouring height, and pouring spread, the area of ​​the cold joint to be detected is determined.

[0019] Furthermore, a first electronic fence and a second electronic fence are set up at the loading port of the transport vehicle and the unloading port of the pump truck, respectively. When the transport vehicle passes through the first electronic fence and the second electronic fence, the license plate information of the transport vehicle is recorded, and the license plate information is compared to track the loading time and time interval ΔT of the concrete mixture to be poured.

[0020] Furthermore, a temperature sensor is installed inside the pump truck's hose to collect the temperature t of the concrete mixture upon entry into the container.

[0021] The construction control system based on refined detection of cold joints in concrete as described in this invention includes:

[0022] The parameter acquisition module is used to collect the time of concrete mixture loading from the transport vehicle and record the time interval ΔT between the next concrete mixture pouring and the current time. After the concrete mixture is loaded into the pump truck, the temperature t of the concrete mixture entering the pump truck is collected. The falling center coordinates and pouring flow rate of the concrete mixture are collected during the pouring.

[0023] The spatiotemporal calculation module is used to calculate the initial setting time T of concrete mixture at temperature t. t ; and spatial information of the concrete mixture calculated based on the coordinates of the falling center and the pouring flow rate, to determine the area of ​​the cold joint to be detected;

[0024] The cold joint detection and construction control module is used when ΔT < T t When no cold joint is generated, the next layer of concrete mixture is poured in the area where the cold joint to be detected is located; when ΔT > T t When pouring concrete, roughen and / or install reinforcing bars in the area where cold joints are to be inspected before pouring the next layer of concrete mixture.

[0025] Furthermore, the initial setting time T of the concrete mixture at temperature t t =T 20 ·e k(t-20) ;

[0026] Where T 20 is the initial setting time of the concrete mixture when the temperature upon entering the placement chamber is 20℃, and k is a temperature coefficient obtained by fitting the experimental results.

[0027] Furthermore, an RTK positioning device is installed on the robotic arm of the pump truck to collect the coordinates of the falling center during pouring, and a flow meter is installed inside the hose of the pump truck to collect the pouring flow rate Q.

[0028] Calculate the pouring volume V based on the pouring flow rate:

[0029]

[0030] Where Q(i) is the pouring flow rate detected by the flow meter in the i-th time, n is the total number of times the flow meter detects the flow, and f is the flow meter detection frequency;

[0031] Calculate the pouring height H and pouring spread D of the concrete mixture based on the pouring volume V:

[0032] H=Aln(V)+B, D=Cln(V)+D;

[0033] Where A and B are the pouring height coefficients, and C and D are the pouring expansion coefficients, which are obtained by fitting the test results;

[0034] Based on the concrete pouring frustum model fitted at the center coordinates of the fall, using the pouring volume, pouring height, and pouring spread, the area of ​​the cold joint to be detected is determined.

[0035] Furthermore, a first electronic fence and a second electronic fence are set up at the loading port of the transport vehicle and the unloading port of the pump truck, respectively. When the transport vehicle passes through the first electronic fence and the second electronic fence, the license plate information of the transport vehicle is recorded, and the license plate information is compared to track the loading time and time interval ΔT of the concrete mixture to be poured.

[0036] A temperature sensor is installed inside the pump truck's hose to collect the temperature t of the concrete mixture when it is poured.

[0037] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the construction control method based on refined detection of cold joints in concrete.

[0038] Beneficial Effects: Compared with existing technologies, the advantages of this invention are as follows: This invention collects parameters during the concrete mixing process. Based on the collected parameter information, it calculates the initial setting time, drop center coordinates, pouring volume, pouring height, pouring spread, and pouring interval of the concrete from the same transport vehicle. By comparing the initial setting time and pouring interval of the concrete at each pouring location, the invention detects cold joints at that location, thereby controlling the construction method. This invention uses multiple sensors to precisely calculate the initial setting time, pouring location, and pouring interval to detect whether cold joints are forming in the concrete. This allows for precise control of the concrete pouring time at each location, preventing the formation of cold joints in the mixture and improving construction quality and efficiency. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the sensor installation location in an embodiment of the present invention.

[0040] Figure 2 This is a schematic diagram of the inlet temperature and initial setting time in an embodiment of the present invention.

[0041] Figure 3 This is a diagram showing the relationship between the pouring volume and the pouring height in an embodiment of the present invention.

[0042] Figure 4 This is a diagram showing the relationship between the pouring volume and the pouring spread in an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the pouring space information in an embodiment of the present invention.

[0044] In the diagram: 1. Mixing plant; 2. Transport vehicle; 3. Pump truck; 4. Hoses; 5. Robotic arm; 6. RTK positioning device; 7. Flow meter; 8. Temperature sensor; 9. First electronic fence; 10. Second electronic fence; 11. First main control box; 12. Second main control box; 13. Third main control box; 14. 4G antenna. Detailed Implementation

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0046] like Figure 1 As shown, the loading port of the mixing plant 1 is equipped with a first electronic fence 9, which monitors the loading time of the concrete mixture in real time by detecting the license plate information of the transport vehicle 2 and recording the timestamp. The unloading port of the pump truck 3 is equipped with a second electronic fence 10, which determines the pouring vehicle information by detecting the license plate information of the transport vehicle 2. The pump truck 3 is equipped with a robotic arm 5, and the top of the robotic arm 5 is equipped with an RTK positioning device 6, which is used to locate the center coordinates of the falling concrete mixture in real time. The end of the robotic arm 5 is connected to a hose 4, and the hose 4 is equipped with a temperature sensor 8 and a flow meter 7. The temperature sensor 8 calculates the initial setting time of the concrete by detecting the temperature of the concrete mixture entering the formwork, and the flow meter 7 calculates the pouring volume, pouring height, and pouring spread of the concrete mixture by detecting the pouring flow rate. The first electronic fence 9 and the second electronic fence 10 are connected to the first main control box 11 and the second main control box 12, respectively. The RTK positioning device 6, the temperature sensor 8, and the flow meter 7 are all connected to the third main control box 13. The first main control box 11, the second main control box 12, and the third main control box 13 are used to collect and store parameter information. Each of the first main control box 11, the second main control box 12, and the third main control box 13 is equipped with a 4G antenna 14. The 4G antenna 14 is used to transmit parameter information to the server to detect whether cold joints are generated in the concrete and to control the construction method.

[0047] The construction control method based on refined detection of cold joints in concrete of the present invention includes the following steps.

[0048] Step one: Throughout the entire concrete mixture pouring process, the license plate information of the transport vehicle 2 is recorded and the pouring vehicle information is determined using the first electronic fence 9 and the second electronic fence 10. This specifically includes the following steps:

[0049] At the loading port of mixing plant 1 and the unloading port of pump truck 3, a first electronic fence 9 and a second electronic fence 10 are installed respectively. When transport vehicle 2 passes through the first electronic fence 9, the license plate information is recorded. When transport vehicle 2 passes through the second electronic fence 10, the license plate information is recorded and matched with the data information of the first electronic fence 9 to determine the current pouring vehicle information.

[0050] Step two involves collecting the concrete's initial temperature upon placement using temperature sensor 8 and calculating the initial setting time. This includes the following steps:

[0051] A temperature sensor 8 is installed inside the hose 4 of the pump truck 3 to detect the temperature of the concrete mixture when it is poured into the formwork in real time. The initial setting time of the concrete is calculated by combining the relationship between the temperature of the concrete and the initial setting time.

[0052] T t =T20 ·e k(t-20) ;

[0053] Among them, T t T represents the initial setting time of concrete at a pouring temperature of t℃. 20 The initial setting time of concrete at a placement temperature of 20℃, such as... Figure 2 As shown in the figure, t is the concrete pouring temperature, and k is the temperature coefficient, obtained from the experiment. Figure 2 As shown, the result obtained by fitting the experimental results is k = -0.04314 ± 0.0033 in this embodiment.

[0054] Step 3: The RTK positioning device 6 is used to locate the center coordinates of the concrete mixture's fall. A flow meter is used to collect the concrete mixture's pouring flow rate and calculate the pouring volume. This data is then converted to obtain the pouring height and spread of the mixture after its fall. Combining the pouring point location, pouring volume, pouring height, and pouring spread, the spatial information for the concrete mixture's pouring is determined. Specifically, this includes the following steps:

[0055] When the pump truck 3 starts pouring, the RTK positioning device 6 installed above the robotic arm 5 positions the center coordinates (X,Y) of the concrete falling center. When the concrete mixture passes through the flow meter 7 in the hose 3, the pouring flow rate Q of the mixture is recorded, and the pouring volume V is calculated based on the pouring flow rate Q.

[0056]

[0057] Where Q(i) is the pouring flow rate detected by the flow meter in the i-th time, n is the total number of times the flow meter detects the flow, and f is the flow meter detection frequency.

[0058] Simulation experiments were conducted to simulate the drop of concrete of different volumes, collecting data on the pouring height and spread after the drop. Combining this data with the simulation data on pouring volume, pouring height, and spread, a relationship between pouring volume, pouring height, and spread was fitted, such as... Figure 3 and Figure 4 As shown, the four coefficients A, B, C, and D are obtained respectively, and the pouring height and pouring spread of the concrete are calculated.

[0059] H=Aln(V)+B, D=Cln(V)+D;

[0060] Where H is the pouring height, V is the pouring volume, and A and B are pouring height coefficients; D is the pouring extension, V is the pouring volume, and C and D are pouring extension coefficients. In this embodiment, the fitted values ​​are A = 0.15227 ± 0.0326, B = 0.23867 ± 0.07453, C = 2.8688 ± 0.47418, and D = 1.64207 ± 1.08388.

[0061] Furthermore, the concrete pouring frustum model is determined by combining the pouring volume, pouring height, and pouring spread, such as... Figure 5 As shown, the area of ​​the concrete-cast truncated cone is the cold joint area to be inspected.

[0062] Step four involves real-time monitoring of the concrete mix pouring interval using the time recorded by the first electronic fence 9. Combining the initial setting time of the mix, the pouring interval, and spatial information, it is determined whether cold joints have formed in the concrete. This specifically includes the following steps:

[0063] The first electronic fence 9 records the time of the current concrete mix loading (referred to as the first loading). The concrete mix in pump truck 3 is now poured (referred to as the first pour). Transport vehicle 2 then transports concrete mix to pump truck 3 again to prepare for the second concrete mix pour. Starting from the loading time of the first loading, the concrete mix pouring interval ΔT is recorded in real time, i.e., the time interval between the second pour and the first loading, and it is detected whether the second pour will cause cold joints in the area to be detected.

[0064]

[0065] By acquiring spatial information, it is determined whether the concrete in the area to be tested for cold joints will produce cold joints. If no cold joints are produced, the area to be tested for cold joints can be poured a second time. If cold joints are produced, the concrete surface in the area to be tested for cold joints needs to be roughened, reinforced with steel bars, etc., before the second concrete pouring can be carried out.

[0066] The construction control system based on refined detection of cold joints in concrete as described in this invention includes:

[0067] The parameter acquisition module is used to collect parameters during concrete transportation and pouring. This includes: a first electronic fence 9 at the loading port of the mixing plant 1, which monitors the loading time of the concrete mixture in real time by detecting the license plate information of the transport vehicle 2 and recording the timestamp. A second electronic fence 10 at the unloading port of the pump truck 3, which determines the pouring vehicle information by detecting the license plate information of the transport vehicle 2. The pump truck 3 is equipped with a robotic arm 5, and an RTK positioning device 6 is installed on the top of the robotic arm 5. The RTK positioning device 6 is used to locate the center coordinates of the falling concrete mixture in real time. A flexible hose 4 is connected to the end of the robotic arm 5. A temperature sensor 8 and a flow meter 7 are installed inside the hose 4. The temperature sensor 8 calculates the initial setting time of the concrete by detecting the temperature of the concrete mixture upon entry into the formwork, and the flow meter 7 calculates the pouring volume, pouring height, and pouring spread of the concrete mixture by detecting the pouring flow rate. The first electronic fence 9 and the second electronic fence 10 are connected to the first main control box 11 and the second main control box 12, respectively. The RTK positioning device 6, the temperature sensor 8, and the flow meter 7 are all connected to the third main control box 13. The first main control box 11, the second main control box 12, and the third main control box 13 are used to collect and store parameter information. Each of the first main control box 11, the second main control box 12, and the third main control box 13 is equipped with a 4G antenna 14. The 4G antenna 14 is used to transmit parameter information to the spatiotemporal calculation module to detect whether cold joints are generated in the concrete and to control the construction method.

[0068] The spatiotemporal calculation module is used to calculate the initial setting time, drop center coordinates, pouring volume, pouring height, pouring spread and pouring interval of concrete for the same transport vehicle based on the collected parameter information, and to determine the cold joint detection area.

[0069] The cold joint detection and construction control module is used to compare the initial setting time and pouring interval of the concrete at the pouring location based on the initial setting time of the concrete from the same transport vehicle, the center coordinates of the fall, the pouring volume, the pouring height, the pouring spread, and the pouring interval. The pouring interval is the time interval between the second pour and the first loading. Based on the comparison results, it detects whether a cold joint is generated in the concrete. If a cold joint is generated, the cold joint detection area is treated before the second pour is carried out. Otherwise, the second pour can be carried out directly in the cold joint detection area.

[0070] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the construction control method based on refined detection of cold joints in concrete.

[0071] The computer-readable storage medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or any other medium that can be used to store program code in the form of instructions or data structures and is accessible by a computer.

[0072] The processor is used to execute a computer program stored in memory to implement the various steps in the methods described in the above embodiments.

Claims

1. A construction control method based on concrete cold joint refinement detection, characterized by, The method comprises the following steps: collecting the concrete mixture loading time of the transport vehicle and recording the time interval ΔT with the next concrete mixture pouring in real time; The concrete mixture in the transport vehicle is loaded into the pump vehicle, and the temperature t of the concrete mixture in the pump vehicle is measured to calculate the initial setting time T of the concrete mixture at the temperature t t ; collecting the falling center coordinates and pouring flow rate of the concrete mixture at the time of pouring, and calculating the spatial information of the concrete mixture according to the falling center coordinates and the pouring flow rate to determine the area to be detected for the cold joint; When ΔT < T t a cold joint is not generated, and the next layer of concrete mixture is poured in the area to be detected for cold joint; when ΔT > T t the concrete in the area to be detected for cold joint is chiseled and / or treated with reinforcing bars before the next layer of concrete mixture is poured.

2. The construction control method based on concrete cold joint refinement detection according to claim 1, characterized by, Initial setting time T of the concrete mixture at temperature t t = T 20 · e k(t-20) ; where T 20 is the temperature coefficient, obtained from test results.

3. The construction control method based on concrete cold joint refinement detection according to claim 1, characterized by, installing an RTK positioning device on the mechanical arm of the pump truck to collect the falling center coordinates at the time of pouring, and installing a flowmeter inside the hose of the pump truck to collect the pouring flow rate Q; calculating the pouring volume V according to the pouring flow rate: wherein Q(i) is the pouring flow rate detected by the flowmeter for the i th time, n is the total number of times of flow detection by the flowmeter, and f is the flowmeter detection frequency; calculating the pouring height H and the pouring spread D of the concrete mixture according to the pouring volume V: H = Aln(V) + B, D = Cln(V) + D; wherein A and B are the pouring height coefficients, and C and D are the pouring spread coefficients, which are obtained by fitting the test results; fitting the concrete pouring cone model at the falling center coordinates according to the pouring volume, the pouring height and the pouring spread to determine the area to be detected for the cold joint.

4. The construction control method based on concrete cold joint refinement detection according to claim 1, characterized by, The first electronic fence and the second electronic fence are respectively arranged at the loading port of the transport vehicle and the unloading port of the pump truck, the license plate information of the transport vehicle is recorded when the transport vehicle passes through the first electronic fence and the second electronic fence, and the license plate information is compared to track the loading time and the time interval ΔT of the concrete mixture to be poured.

5. The construction control method based on concrete cold joint refinement detection according to claim 1, characterized by, A temperature sensor is installed inside the hose of the pump truck to collect the warehouse entry temperature t of the concrete mixture at the time of pouring.

6. A construction control system based on concrete cold joint refinement detection, characterized by, The method comprises the following steps: a parameter collection module is configured to collect the concrete mixture loading time of the transport vehicle and record the time interval ΔT with the next concrete mixture pouring in real time; after the concrete mixture in the transport vehicle is loaded into the pump truck, the warehouse entry temperature t of the concrete mixture in the pump truck is collected; the falling center coordinates and the pouring flow rate of the concrete mixture at the time of pouring are collected; a space-time computing module for calculating the initial setting time T of the concrete mixture at temperature t t ; and a calculation module is configured to calculate the spatial information of the concrete mixture according to the falling center coordinates and the pouring flow rate to determine the area to be detected for the cold joint; a cold joint detection and construction control module for not producing a cold joint when ΔT < T t and pouring the next layer of concrete mixture in the area to be detected for a cold joint; and for chiseling and / or rebar planting the concrete in the area to be detected for a cold joint before pouring the next layer of concrete mixture when ΔT > T t .

7. The concrete cold joint refinement detection based construction control system of claim 6, wherein, Initial setting time T of the concrete mixture at temperature t t = T 20 · e k(t-20) ; where T 20 is the temperature coefficient, obtained from fitting the test results.

8. The concrete cold joint refinement detection based construction control system of claim 6, wherein, an RTK positioning device is installed on the mechanical arm of the pump truck to collect the falling center coordinates at the time of pouring, and a flowmeter is installed inside the hose of the pump truck to collect the pouring flow rate Q; the pouring volume V is calculated according to the pouring flow rate: wherein Q(i) is the pouring flow rate detected by the flowmeter for the i th time, n is the total number of times of flow detection by the flowmeter, and f is the flowmeter detection frequency; the pouring height H and the pouring spread D of the concrete mixture are calculated according to the pouring volume V: H = Aln(V) + B, D = Cln(V) + D; wherein A and B are the pouring height coefficients, and C and D are the pouring spread coefficients, which are obtained by fitting the test results; the concrete pouring cone model at the falling center coordinates is fitted according to the pouring volume, the pouring height and the pouring spread to determine the area to be detected for the cold joint.

9. The construction control system based on concrete cold joint refinement detection of claim 6, wherein, A first electronic fence and a second electronic fence are respectively arranged at the loading port of the transport vehicle and the unloading port of the pump vehicle, and the license plate information of the transport vehicle is recorded when the transport vehicle passes through the first electronic fence and the second electronic fence, and the license plate information is compared to track the loading time and the time interval ΔT of the concrete mixture to be poured; A temperature sensor is installed inside the hose of the pump vehicle to collect the warehouse entry temperature t of the concrete mixture during pouring.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1-9. The computer program is executed by the processor to implement the construction control method based on the concrete cold joint fine detection according to any one of claims 1-5.

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