A precise weighing device for soil excavation from an earth pressure balance shield tunnel and its application method

Abstract

This invention discloses a precise weighing device and application method for soil excavation volume from an earth pressure balance shield tunneling machine (TBM). The device includes a TBM and a control console located within it. A screw conveyor and a conveyor belt are installed inside the TBM, with a weighing component positioned between them. The discharge end of the screw conveyor is located above the weighing component, and the feed end of the conveyor belt is located below it. This precise weighing device is a static weighing system, ensuring reliable weighing accuracy and stable weighing data, unaffected by external interference. The weighing sensor setpoint can be set according to the on-site TBM soil excavation conditions, and the opening and closing cycle of the openable baffle can be adjusted. This allows for phased understanding of the relationship between the advance distance and the soil excavation volume. The weighing device is layered, achieving weighing without being affected by continuous TBM soil excavation, ensuring accurate and stable weighing. It also offers high visualization, allowing for intuitive understanding of the TBM tunneling status on the control room computer, and determining whether over-excavation or under-excavation has occurred.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel technology, and in particular to a precise weighing device for soil excavation from an earth pressure balance shield tunnel and its application method. Background Technology

[0002] Earth pressure balance tunnel boring machines (TBMs) work by using the earth pressure within a pressure chamber to balance the soil at the excavation face, thus providing support for the face directly in front of the tunnel boring machine. During tunnel advancement, the cutterhead rotates and excavates the soil, which enters the earth chamber. When the earth chamber is full, the passive earth pressure is essentially balanced with the earth and water pressure at the excavation face, maintaining equilibrium between the excavation face and the tunnel face. A screw conveyor then transports the excavated soil to the earth box and to the surface.

[0003] The balance of the tunnel face during shield tunneling is mainly related to whether the amount of excavated soil and the amount of soil removed from the shield are kept in balance. In actual engineering, the amount of excavated soil is controlled by the speed of the screw conveyor. Poor coordination of the excavated soil can easily lead to instability of the soil at the face and surface subsidence. The speed of the screw conveyor can be adjusted by accurately weighing the excavated soil to make the amount of excavated soil from the shield close to the theoretical value, thereby ensuring the balance of the tunnel face and keeping the strata at the excavation face stable.

[0004] Currently, existing weighing devices for tunnel boring machine (TBM) excavation mainly include belt scales, laser scanning weighing, and gantry crane weighing. Belt scales, as a form of dynamic weighing, weigh the excavated soil while it is being transported, but their accuracy is still slightly lower than that of static weighing. Laser scanning weighing, being inside the tunnel, is affected by unstable factors such as lighting and dust from the excavated soil, resulting in poor stability and high cost. Gantry crane weighing is a relatively traditional method, inefficient, and the measured weight of the excavated soil is significantly delayed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a precise weighing device and application method for soil excavation from earth pressure balance shield tunnels.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A precise weighing device for soil excavation from an earth pressure balance shield tunnel includes a shield machine and a control console located therein. The shield machine is equipped with a screw conveyor and a conveyor belt. A weighing component is provided between the screw conveyor and the conveyor belt. The discharge end of the screw conveyor is located above the weighing component, and the feed end of the conveyor belt is located below the weighing component. A lifting structure is connected below the weighing component, and the vertical height between the weighing component and the conveyor belt is adjusted by the lifting structure.

[0008] Preferably, the weighing component includes a frame, inside which are respectively provided a first openable baffle and a second openable baffle arranged horizontally, with the first openable baffle located above the second openable baffle. A storage compartment is formed above the first openable baffle, and a weighing compartment is formed above the second openable baffle. The first and second openable baffles are controlled to open and close by a drive component. A sensing opening and closing device is installed on the frame, which controls the first and second openable baffles to open and close alternately. The second openable baffle is connected to the frame through a weighing sensor.

[0009] Preferably, the lifting structure includes an electric telescopic rod connected to the bottom of the frame, and a guide wheel is connected to the lower end of the electric telescopic rod.

[0010] Preferably, the upper end of the electric telescopic rod is connected to the frame via a shock absorber.

[0011] Preferably, a muck transport vehicle is provided at the end of the conveyor belt away from the weighing component.

[0012] A method for applying a precise weighing device for soil excavation volume from an earth pressure balance shield tunneling machine includes the following steps:

[0013] 1) As the tunnel boring machine advances forward, the excavated soil cut by the cutterhead is continuously transported by the screw conveyor and falls into the weighing assembly. At this time, the first openable baffle opens, and the excavated soil falls from the discharge port of the screw conveyor into the weighing bin, where the weighing sensor begins to weigh.

[0014] 2) After the weighing sensor measures the weight of the slag in the weighing bin to a tons, the weighing sensor transmits a pulse signal to the sensing opening and closing device via a cable. The sensing opening and closing device controls the first openable baffle to close. At this time, the slag continues to fall into the storage bin. After the weighing sensor completes the second weighing, the second openable baffle opens. Both the first and second openable baffles move and open along the direction perpendicular to the pipe segment. After the second openable baffle closes and returns to its original position, the first openable baffle opens, and the slag continues to fall into the weighing bin for weighing. The weighing sensor transmits the weighing data to the control console, thus completing one weighing cycle.

[0015] 3) The lower conveyor belt then transports the excavated soil to the tail of the tunnel boring machine, where it is transported out by excavated soil trucks. At a certain time, the control console displays the actual excavated soil volume as (a+b) tons, while the actual theoretical excavated soil volume is a tons. Based on this, it is determined that the tunnel boring machine is currently in an over-excavation state, with an over-excavation of b tons. The tunnel boring machine's tunneling parameters need to be adjusted, and the speed of the screw conveyor should be reduced. The over-excavation area is estimated by the pressure sensor on the shield itself, and the over-excavation amount of b tons serves as the basis for dynamic grouting supplementation in the local over-excavation area.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The precision weighing device of the present invention is a static weighing device with reliable weighing accuracy and stable weighing data, which is not affected by external interference.

[0018] 2. The weighing value of the metering and weighing sensor can be set according to the soil excavation situation of the shield tunnel on site, and the opening and closing cycle of the openable and closable baffle can be adjusted to understand the relationship between the advance distance and the amount of soil excavated in stages.

[0019] 3. The weighing device is divided into upper and lower layers, so that it can weigh without being affected by the continuous excavation of soil from the tunnel boring machine, thus ensuring the accuracy and stability of the weighing.

[0020] 4. High degree of visualization: The tunnel boring machine's excavation status can be intuitively understood on the computer in the control room, and it can be determined whether there is over-excavation or under-excavation.

[0021] 5. The calculated over-excavation amount can be used as the basis for the over-excavation compensation amount of synchronous grouting. Attached Figure Description

[0022] To illustrate the technical solutions in the embodiments of the present invention or the prior art more specifically and intuitively, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structural layout inside the tunnel boring machine of this invention;

[0024] Figure 2 This is a schematic diagram of the precise weighing device of the present invention.

[0025] In the diagram: 1. Tunnel boring machine; 2. Weighing assembly; 21. Storage bin; 22. Weighing bin; 23. Drive assembly; 231. First openable baffle; 232. Second openable baffle; 24. Shock absorber; 25. Metering and weighing sensor; 26. Inductive opening and closing device; 27. Frame; 28. Electric telescopic rod; 3. Screw conveyor; 4. Conveyor belt; 5. Control console; 6. Slag transport vehicle. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Reference Figure 1-2 A precise weighing device for soil excavation from an earth pressure balance shield tunnel includes a shield machine 1 and a control console 5 located inside it. The shield machine 1 is equipped with a screw conveyor 3 and a conveyor belt 4. A weighing component 2 is located between the screw conveyor 3 and the conveyor belt 4. The discharge end of the screw conveyor 3 is located above the weighing component 2, and the feed end of the conveyor belt 4 is located below the weighing component 2. A lifting structure is connected below the weighing component 2, and the vertical height between the weighing component 2 and the conveyor belt 4 is adjusted by the lifting structure.

[0028] In this embodiment, the weighing component 2 includes a frame 27. Inside the frame 27, there are horizontally arranged first openable baffles 231 and second openable baffles 232, with the first openable baffle 231 located above the second openable baffle 232. A storage chamber 21 is formed above the first openable baffle 231, and a weighing chamber 22 is formed above the second openable baffle 232. The first openable baffle 231 and the second openable baffle 232 are controlled to open and close by a drive component 23. A sensing opening and closing device 26 is installed on the frame 27. The sensing opening and closing device 26 controls the first openable baffle 231 and the second openable baffle 232 to open and close alternately. Residual slag on the first openable baffle 231 and the second openable baffle 232 can be automatically cleared and fallen. The second openable baffle 232 is connected to the frame 27 through a weighing sensor 25.

[0029] In this embodiment, the lifting structure includes an electric telescopic rod 28 connected to the bottom of the frame 27. The lower end of the electric telescopic rod 28 is connected to a guide wheel, which enables the device to move and move forward with the tunnel boring machine 1. The height is adjusted according to the amount of excavated soil, so that the height is balanced between the amount of excavated soil and stability.

[0030] In this embodiment, the upper end of the electric telescopic rod 28 is connected to the frame 27 through the shock absorber 24, which can reduce the impact of the falling slag on the weighing accuracy of the weighing sensor 25. The end of the conveyor belt 4 away from the weighing component 2 is equipped with a slag transport vehicle 6.

[0031] A method for applying a precise weighing device for soil excavation volume from an earth pressure balance shield tunneling machine includes the following steps:

[0032] 1) The tunnel boring machine 1 advances forward, and the slag cut off by the cutterhead is transported by the screw conveyor 3 and continuously falls into the weighing assembly 2. At this time, the first openable baffle 231 opens, and the slag falls from the slag outlet of the screw conveyor 3 into the weighing bin 22. The weighing sensor 25 starts to weigh.

[0033] 2) After the weighing sensor 25 measures the weight of the slag in the weighing bin 22 to a ton, the weighing sensor 25 transmits a pulse signal to the sensing opening and closing device 26 via a cable. The sensing opening and closing device 26 controls the first openable baffle 231 to close. At this time, the slag continues to fall into the storage bin 21. After the weighing sensor 25 completes the second weighing, the second openable baffle 232 opens. Both the first openable baffle 231 and the second openable baffle 232 move and open along the direction perpendicular to the pipe segment. After the second openable baffle 232 closes and returns to its original position, the first openable baffle 231 opens, and the slag continues to fall into the weighing bin 22 for weighing. The weighing sensor 25 transmits the weighing data to the control console 5, thus completing one weighing cycle.

[0034] 3) The lower conveyor belt 4 then transports the excavated soil to the tail of the tunnel boring machine 1, where it is transported out by the excavated soil transport vehicle 6. At a certain time, the control console 5 displays the actual excavated soil volume as (a+b) tons, while the actual theoretical excavated soil volume is a tons. Based on this, it is determined that the tunnel boring machine is currently in an over-excavation state, with an over-excavation of b tons. The tunnel boring machine's tunneling parameters need to be adjusted, and the speed of the screw conveyor 3 needs to be reduced. The over-excavation area is estimated by the tunnel boring machine's own diaphragm pressure sensor, and the over-excavation amount of b tons serves as the basis for dynamic grouting supplementation in the local over-excavation area.

[0035] In a certain shield tunnel section, the earth pressure balance shield machine 1 has a diameter of 6.4m. Considering the practicality of the device, the width and height of the storage chamber 21 of the weighing component 2 should be appropriately selected according to the diameter of the shield machine. In this embodiment, the length, width and height of the storage chamber of the weighing component 2 are set to 3×2×2m. Therefore, the dimensions of the storage chamber 21 and the weighing chamber 22 are 3×2×1m, that is, the maximum storage capacity of the storage chamber 21 and the weighing chamber 22 is 6m³. 3 Considering the influence of other factors such as the density of the slag and the load of the slag pile, it is assumed that the weighing value of the weighing component 2 is 1 ton.

[0036] The earth pressure balance tunnel boring machine 1 advances forward. The excavated soil cut by the cutterhead is conveyed by the screw conveyor 3 and continuously falls into the weighing assembly 2. At this time, the first openable baffle 231 opens, and the excavated soil falls from the discharge port of the screw conveyor 3 into the weighing bin 22. The weighing sensor 25 starts weighing. After the weighing sensor 25 weighs 10 tons of excavated soil in the weighing bin 22, the weighing sensor 25 transmits a pulse signal to the sensing opening and closing device 26 through a cable. The sensing opening and closing device 26 controls the first openable baffle 231 to close. At this time, the excavated soil continues to fall into the storage bin 21. After the weighing sensor 25 completes the second weighing, the second openable baffle 232 opens. After the second openable baffle 232 closes and returns to its original position, the first openable baffle 231 opens, and the excavated soil continues to fall into the weighing bin 22 for weighing. The weighing sensor 25 transmits the weighing data to the control console 5, which constitutes one weighing cycle.

[0037] The lower conveyor belt 4 then transports the excavated soil to the tail of the tunnel boring machine 1, where it is transported out by the excavated soil truck 6. At a certain time, the control console 5 displays the actual excavated soil volume as 10.5 tons, while the theoretical excavated soil volume is calculated to be 10 tons. Based on this, it is determined that the tunnel boring machine is currently in an over-excavation state, with an over-excavation of 0.5 tons. The tunnel boring machine's tunneling parameters need to be adjusted, and the speed of the screw conveyor should be reduced. The over-excavation area is estimated by the tunnel boring machine's own diaphragm pressure sensor, and the over-excavation amount of 0.5 tons serves as the basis for dynamic grouting supplementation in the local over-excavation area.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A kind of earth pressure balance shield earth volume accurate weighing device, including shield machine (1) and the control console (5) in it, respectively be equipped with screw conveyor (3) and conveying belt (4) in shield machine (1), it is characterized in that, The weighing assembly (2) is arranged between the screw conveyor (3) and the conveying belt (4), the discharge end of the screw conveyor (3) is located above the weighing assembly (2), the feeding end of the conveying belt (4) is located below the weighing assembly (2), and the lifting structure is connected below the weighing assembly (2), and the vertical height of the weighing assembly (2) and the conveying belt (4) is adjusted through the lifting structure; The weighing assembly (2) comprises a frame (27), the frame (27) is internally provided with a first openable and closable baffle (231) and a second openable and closable baffle (232) arranged horizontally, the first openable and closable baffle (231) is located above the second openable and closable baffle (232), a storage bin (21) is formed above the first openable and closable baffle (231), a weighing bin (22) is formed above the second openable and closable baffle (232), the first openable and closable baffle (231) and the second openable and closable baffle (232) are controlled to open and close by a driving assembly (23), the frame (27) is provided with a sensing and opening and closing device (26), the sensing and opening and closing device (26) controls the first openable and closable baffle (231) and the second openable and closable baffle (232) to open and close alternately, and the second openable and closable baffle (232) is connected with the frame (27) through a metering and weighing sensor (25).

2. The device for accurately weighing earth pressure balance shield earth volume according to claim 1, characterized in that, The lifting structure comprises an electric telescopic rod (28) connected to the bottom of the frame (27), and a guide wheel is connected to the lower end of the electric telescopic rod (28).

3. The device for accurately weighing earth pressure balance shield earth discharge quantity according to claim 2, characterized in that, The upper end of the electric telescopic rod (28) is connected with the frame (27) through a shock absorber (24).

4. The device for accurately weighing earth pressure balance shield earth removal quantity according to claim 3, characterized in that, One end of the conveying belt (4) away from the weighing assembly (2) is provided with a muck transport vehicle (6).

5. The application method of the earth pressure balance shield earth removal quantity accurate weighing device according to any one of claims 1-4, characterized in that, The application method comprises the following steps: 1) the shield tunneling machine (1) advances, the muck cut by the cutter head is continuously fed into the weighing assembly (2) after being conveyed by the screw conveyor (3), at this time, the first openable and closable baffle (231) is opened, the muck falls from the discharge port of the screw conveyor (3) into the weighing bin (22), and the metering and weighing sensor (25) starts weighing; 2) after the metering and weighing sensor (25) weighs the muck in the weighing bin (22) to reach a weight a tons, the metering and weighing sensor (25) transmits a pulse signal to the sensing and opening and closing device (26) through a cable, the sensing and opening and closing device (26) controls the first openable and closable baffle (231) to be closed, at this time, the muck continuously falls into the storage bin (21), after the metering and weighing sensor (25) is weighed again, the second openable and closable baffle (232) is opened, the first openable and closable baffle (231) and the second openable and closable baffle (232) are both opened and closed along the direction perpendicular to the segment, after the second openable and closable baffle (232) is closed and returned to the original position, the first openable and closable baffle (231) is opened, the muck continues to fall into the weighing bin (22) for metering and weighing, and the metering and weighing sensor (25) transmits the weighing data to the control console (5) as a weighing cycle. 3) The lower conveying belt (4) will deliver the muck to the tail of the shield machine (1), and the muck will be transported out by the muck transport vehicle (6). The actual mucking amount is (a+b) tons, and the actual calculated theoretical mucking amount is a tons. Thus, it is determined that the shield is in the overbreak state, overbreaks b tons, and the shield tunneling parameters need to be adjusted to reduce the speed of the screw conveyor (3). The overbreak area is estimated by the shield's own partition pressure sensor, and the overbreak amount b tons is used as the basis for dynamic grouting supplement in the local overbreak area.

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