CN118361250B - Pressure maintaining, gas transporting, opening and tool changing method for earth pressure balance shield machine - Google Patents
Pressure maintaining, gas transporting, opening and tool changing method for earth pressure balance shield machine Download PDFInfo
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- CN118361250B CN118361250B CN202410533022.8A CN202410533022A CN118361250B CN 118361250 B CN118361250 B CN 118361250B CN 202410533022 A CN202410533022 A CN 202410533022A CN 118361250 B CN118361250 B CN 118361250B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
本发明公开了一种土压平衡盾构机保压运移瓦斯开仓换刀方法，包括：一、关闭安装在土压平衡盾构机的土仓上的所有泄压阀，使土仓保持密闭状态；二、向土仓内持续注入空气，对土仓实施加压与保压；三、打开安装在土压平衡盾构机的土仓上的所有泄压阀进行泄压；四、施工人员进入土仓更换磨损刀具；五、多次重复步骤一至步骤四，直至完成所有的磨损刀具的更换。本发明采取土仓保压运移瓦斯的方式，能够将土仓内的瓦斯运移挤压至地层裂隙中，将土仓内瓦斯浓度控制在瓦斯浓度限定值以内，此时，土仓处于一个可作业安全时段，在可作业安全时段内打开土仓门，不会触发风电闭锁机制，不会导致土压平衡盾构机断电，能够完成磨损刀具的更换工作。
The present invention discloses a method for opening and changing cutters of an earth pressure balance shield machine for pressure-maintaining gas transportation, including: 1. Closing all pressure relief valves installed on the earth bin of the earth pressure balance shield machine to keep the earth bin in a closed state; 2. Continuously injecting air into the earth bin to pressurize and maintain the pressure of the earth bin; 3. Opening all pressure relief valves installed on the earth bin of the earth pressure balance shield machine to release pressure; 4. Construction personnel enter the earth bin to replace worn cutters; 5. Repeating steps 1 to 4 for many times until all worn cutters are replaced. The present invention adopts a method of pressure-maintaining gas transportation in the earth bin, which can transport and squeeze the gas in the earth bin into the stratum fissures, and control the gas concentration in the earth bin within the gas concentration limit value. At this time, the earth bin is in a safe period of operation. Opening the earth bin door within the safe period of operation will not trigger the wind power locking mechanism, will not cause the earth pressure balance shield machine to be powered off, and can complete the replacement of worn cutters.
Description
Technical Field
The invention belongs to the technical field of tunneling and excavating of earth pressure balance shield machines, and particularly relates to a pressure maintaining, gas moving, cabin opening and tool changing method of an earth pressure balance shield machine.
Background
In the process of excavating and excavating a high-gas stratum by using the earth pressure balance shield machine, when the gas concentration in the earth bin of the earth pressure balance shield machine is higher, the abrasion cutter cannot be replaced in the earth bin, and the abrasion cutter cannot be replaced in the earth bin when the gas concentration value in the earth bin is smaller than the gas concentration limiting value, at present, two proposed implementation methods exist, namely, when the earth bin door is closed and the balance valve is opened, air is continuously injected into the earth bin by using the air compressor and the foam pipeline to realize the purpose of replacing gas in the earth bin until the gas concentration in the earth bin is reduced to be within the gas concentration limiting value, but the implementation on site proves that the change of the gas concentration in the earth bin is very small, the effect is basically not achieved, so that the cutter cannot be opened, and the second method is that the earth bin door is directly opened to naturally discharge the gas in the earth bin, and the high-concentration gas in the earth bin escapes from the earth bin door in a large amount, when the methane sensor of the earth pressure balance shield machine detects that the methane concentration reaches 1%, the methane concentration can be triggered to trigger the earth pressure balance valve, and the whole earth pressure balance shield machine can not be closed, so that the earth pressure balance shield machine can not be conveniently operated, and the earth pressure balance shield machine can not be conveniently replaced by providing a method.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a pressure-maintaining gas migration and silo-opening tool changing method of an earth pressure balance shield machine, which has reasonable design, adopts the mode of taking earth silo pressure maintaining gas migration, can transfer and squeeze the gas in the earth silo into stratum cracks, the gas concentration in the soil bin is controlled within the gas concentration limiting value, at this time, the soil bin is in a safe period of operation, the soil bin door is opened in the safe period of operation, the wind power locking mechanism is not triggered, the power-off of the earth pressure balance shield machine is not caused, and the replacement work of the abrasion cutter can be completed.
In order to solve the technical problems, the technical scheme adopted by the invention is that the method for opening and changing the cutter of the pressure maintaining and gas migration of the earth pressure balance shield machine is characterized by comprising the following steps:
step one, closing all pressure relief valves arranged on a soil bin of a soil pressure balance shield machine to keep the soil bin in a closed state;
continuously injecting air into the soil bin, and pressurizing and maintaining the pressure of the soil bin:
Continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, enabling the air supply quantity of the air compressor to be initial air supply quantity, detecting the internal pressure of the soil bin in real time in the continuous pressurizing process, and adjusting the air supply quantity of the air compressor to be foam pipeline air supply quantity after the measured pressure value in the soil bin detected in real time is larger than the maximum value of the tunnel single-hole gas emission pressure, and implementing pressure maintaining to enable the gas in the soil bin to be fully transported and extruded into stratum cracks;
step three, opening all pressure relief valves arranged on a soil bin of the soil pressure balance shield machine to relieve pressure;
In the continuous pressure relief process, detecting the internal pressure of the soil bin in real time, opening a soil bin door when the real-time detected measured pressure value in the soil bin is equal to 0MPa, detecting the gas concentration in the soil bin for a plurality of times, and when the detected gas concentration value in the soil bin is smaller than a gas concentration limiting value, the gas concentration limiting value is 0.5%, executing a step four;
step four, constructors enter the soil bin to replace abrasion cutters:
In the process of replacing the abrasion cutter, continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, and enabling the air supply quantity of the air compressor to be the air supply quantity of the foam pipeline; detecting the gas concentration in the soil bin for multiple times, and when the detected gas concentration value in the soil bin is not smaller than a gas concentration limiting value, withdrawing the soil bin by constructors, closing a soil bin door and executing the first step;
and fifthly, repeating the first step to the fourth step for a plurality of times until the replacement of all the worn cutters is completed.
The pressure maintaining, gas moving, opening and tool changing method of the earth pressure balance shield machine is characterized in that in the second step, the initial air supply quantity is not smaller than 2m < 3 >/min.
The pressure maintaining and gas moving and opening tool changing method of the earth pressure balance shield machine is characterized in that in the second step and the fourth step, the value range of the air quantity of the foam pipeline is 0.15m <3 >/min-1.5 m <3 >/min.
The pressure maintaining, gas moving, opening and tool changing method for the earth pressure balance shield machine is characterized in that in the second step, the value range of the single-hole gas emission pressure of the tunnel is 0.08-0.14 MPa, and the value range of the measured pressure value in the earth bin is 0.15-0.3 MPa.
The pressure maintaining gas moving and opening tool changing method of the earth pressure balance shield machine is characterized in that in the second step, the value range of the pressure maintaining duration is 5-8 hours.
Compared with the prior art, the invention has the following advantages:
1. The method comprises the specific operation processes of firstly closing all pressure relief valves arranged on a soil bin of a soil pressure balance shield machine to enable the soil bin to be kept in a closed state, continuously injecting air into the soil bin by utilizing an air compressor to pressurize the soil bin by using initial air supply quantity, adjusting the air supply quantity of the air compressor to be the air supply quantity of a foam pipeline after the real-time detection that the measured pressure value in the soil bin is larger than the maximum value of single-hole gas emission pressure of a tunnel, and implementing pressure maintaining.
2. The method comprises the steps of continuously decompressing, detecting the internal pressure of a soil bin in real time, opening a soil bin gate when the measured pressure value in the soil bin obtained by real-time detection is equal to 0MPa, detecting the gas concentration in the soil bin for multiple times, enabling constructors to enter the soil bin for replacing abrasion tools when the gas concentration value in the soil bin obtained by detection is smaller than a gas concentration limiting value, and if the gas concentration value in the soil bin obtained by detection is not smaller than the gas concentration limiting value, closing the soil bin gate, continuously and repeatedly carrying out the pressure maintaining and gas migration of the soil bin, and fully transporting and extruding the gas in the soil bin into stratum cracks until the gas concentration value in the soil bin obtained by detection is smaller than the gas concentration limiting value.
3. The invention has reasonable design, improves the operation efficiency and safety of the opening and tool changing of the earth pressure balance shield machine, and is convenient for popularization and application.
In conclusion, the invention has reasonable design, gas in the soil bin can be moved and extruded into stratum cracks by adopting the mode of maintaining pressure and moving gas in the soil bin, the gas concentration in the soil bin is controlled within a gas concentration limiting value, at the moment, the soil bin is in an operable safe period, a soil bin door is opened in the operable safe period, a wind power locking mechanism is not triggered, the power-off of the earth pressure balance shield machine is not caused, and the replacement work of a worn cutter can be completed.
The invention is described in further detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The method for opening and changing the cutter of the pressure maintaining and gas migration of the earth pressure balance shield machine as shown in fig. 1 comprises the following steps:
step one, closing all pressure relief valves arranged on a soil bin of a soil pressure balance shield machine to keep the soil bin in a closed state;
continuously injecting air into the soil bin, and pressurizing and maintaining the pressure of the soil bin:
Continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, enabling the air supply quantity of the air compressor to be initial air supply quantity, detecting the internal pressure of the soil bin in real time in the continuous pressurizing process, and adjusting the air supply quantity of the air compressor to be foam pipeline air supply quantity after the measured pressure value in the soil bin detected in real time is larger than the maximum value of the tunnel single-hole gas emission pressure, and implementing pressure maintaining to enable the gas in the soil bin to be fully transported and extruded into stratum cracks;
step three, opening all pressure relief valves arranged on a soil bin of the soil pressure balance shield machine to relieve pressure;
In the continuous pressure relief process, detecting the internal pressure of the soil bin in real time, opening a soil bin door when the real-time detected measured pressure value in the soil bin is equal to 0MPa, detecting the gas concentration in the soil bin for a plurality of times, and when the detected gas concentration value in the soil bin is smaller than a gas concentration limiting value, the gas concentration limiting value is 0.5%, executing a step four;
step four, constructors enter the soil bin to replace abrasion cutters:
In the process of replacing the abrasion cutter, continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, and enabling the air supply quantity of the air compressor to be the air supply quantity of the foam pipeline; detecting the gas concentration in the soil bin for multiple times, and when the detected gas concentration value in the soil bin is not smaller than a gas concentration limiting value, withdrawing the soil bin by constructors, closing a soil bin door and executing the first step;
and fifthly, repeating the first step to the fourth step for a plurality of times until the replacement of all the worn cutters is completed.
In the second embodiment, in the step two, the initial air supply amount is not less than 2m3/min.
In the embodiment, in the second step and the fourth step, the value range of the air supply quantity of the foam pipeline is 0.15m3/min to 1.5m3/min.
In the second embodiment, in the second step, the value range of the single-hole gas emission pressure of the tunnel is 0.08mpa to 0.14mpa, and the value range of the measured pressure value in the soil bin is 0.15mpa to 0.3mpa.
In the embodiment, in the second step, the value range of the duration of pressure maintaining is 5-8 hours.
In the embodiment, as the gas concentration of the project is increased sharply through survey, a gushing phenomenon occurs, the range of gas concentration of a gas discharge external drilling hole opening is 68% -100%, the range of single hole gas emission quantity of a tunnel is 0.127m 3/min-0.315 m3/min, the range of the emission pressure of a tunnel single Kong Wasi is 0.08 MPa-0.14 MPa, according to field measurement, the maximum gas emission quantity is far greater than 0.5m3/min, and the project belongs to a high-gas high-risk tunnel section.
In the tunneling process of the earth pressure balance shield machine, when a worn cutter needs to be replaced, if a soil bin gate is directly opened, gas in the soil bin rapidly escapes, and when the methane concentration sensed by a methane sensor reaches 1%, a wind power locking mechanism is triggered to cause the whole earth pressure balance shield machine to be powered off, so that the cutter replacing operation cannot be realized at all; and when the measured pressure value in the soil bin obtained by real-time detection is larger than the maximum value of the single-hole gas emission pressure of the tunnel, adjusting the air supply quantity of the air compressor to be the air supply quantity of a foam pipeline, maintaining the pressure, fully transporting and extruding the gas in the soil bin into stratum cracks in the process of pressure maintaining, controlling the gas concentration in the soil bin within a gas concentration limiting value, and opening a soil bin door in an operation safe period at the time, wherein a wind power locking mechanism is not triggered, the earth pressure balance shield machine is not powered off, and the replacement work of a worn cutter can be completed.
The actual operation process is as follows:
Continuously injecting air into the soil bin at the first day 8:10, wherein the initial air supply amount is 2m 3/min, continuously injecting air for 2 hours and 30 minutes, detecting that the measured pressure value in the soil bin is 1.7bar at the first day 10:40, reducing the initial air supply amount to the air supply amount of a foam pipeline, maintaining the pressure, wherein the air supply amount of the foam pipeline is 0.5m3/min, fully transporting and extruding gas in the soil bin into stratum cracks, after the pressure maintaining time is 6 hours, opening all pressure relief valves arranged on the soil bin of the soil pressure balance shield machine at the first day 16:40, starting pressure relief, opening a balance valve and a water drain valve during pressure relief, and overflowing water in the soil bin from the water drain valve after pressure relief.
In the continuous pressure relief process, the internal pressure of the soil bin is detected in real time, the measured pressure value in the soil bin is equal to 0MPa in real time in the first day 16:47, then the soil bin gate is opened, the gas concentration in the soil bin is detected once every ten minutes, the detection result is recorded in table 1, the soil bin gate is closed in 18:00, the time for detecting the gas concentration in the soil bin is 9 times in 73 minutes, and the detection results of 9 times all show that the gas concentration (methane concentration) in the soil bin is lower than 0.5 percent and meet the tool changing operation condition. However, this test did not perform replacement of the wearing tool, and only by verifying the feasibility of the steps one to three in this operation, the gas concentration value inside the soil bin could be controlled within the gas concentration limit value for 73 minutes.
TABLE 1
| Time of | Soil bin pressure (bar) | Methane concentration (%) | Air supply quantity of foam pipeline (m 3/min) | Methane test site |
| 16:40 | 1.7 | / | 0 | / |
| 16:40 | 1.6 | / | 0 | / |
| 16:41 | 1.5 | / | 0 | / |
| 16:42 | 1.4 | / | 0 | / |
| 16:43 | 1.3 | / | 0 | / |
| 16:43 | 1.2 | / | 0 | / |
| 16:44 | 1.1 | / | 0 | / |
| 16:44 | 1.0 | / | 0 | / |
| 16:45 | 0.9 | / | 0 | / |
| 16:45 | 0.8 | / | 0 | / |
| 16:46 | 0.7 | / | 0 | / |
| 16:46 | 0.6 | / | 0 | / |
| 16:46 | 0.5 | / | 0 | / |
| 16:46 | 0.4 | / | 0 | / |
| 16:47 | 0.3 | / | 0 | / |
| 16:47 | 0.2 | / | 0 | / |
| 16:47 | 0.1 | / | 0 | / |
| 16:47 | 0 | 0 | 0 | Balanced valve air outlet |
| 16:57 | 0 | 0.06 | 0.5 | In the soil bin |
| 17:07 | 0 | 0.12 | 0.5 | In the soil bin |
| 17:17 | 0 | 0.05 | 0.5 | In the soil bin |
| 17:27 | 0 | 0.05 | 0.5 | In the soil bin |
| 17:37 | 0 | 0.05 | 0.5 | In the soil bin |
| 17:47 | 0 | 0.05 | 0.5 | In the soil bin |
| 17:57 | 0 | 0.05 | 0.5 | In the soil bin |
| 18:00 | 0 | 0.05 | 0.5 | In the soil bin |
The method comprises the steps of closing a soil bin gate when the gas concentration value in the soil bin detected on a first day 19:22 is larger than a gas concentration limiting value by 0.5%, continuously injecting air into the soil bin again, wherein the initial air supply amount is 2m/min, continuously injecting air for 4 hours and 10 minutes, reducing the initial air supply amount to be the air supply amount of a foam pipeline after the air is detected on the first day 23, wherein the actual measured pressure value in the soil bin is 1.7bar, implementing pressure maintaining, the air supply amount of the foam pipeline is set to be 0.05m/min to 0.1m/min, fully transporting and extruding the gas in the soil bin into a stratum crack, and after the pressure maintaining time is 9 hours and 30 minutes, possibly because the air supply amount parameter of the foam pipeline is set to be too low, detecting the air supply amount of the foam pipeline is 2.2bar again on a second day 10:06, re-implementing pressure maintaining, setting the air supply amount of the foam pipeline to be 0.15m/min, fully transporting the air to be the crack, opening a screw machine for 15 minutes after the air supply amount of the foam pipeline is set to be 0.15m/min, fully transporting and fully draining the air in the stratum crack, and opening a pressure release valve for 15:15 when the soil bin is fully opened, and a soil layer is fully released, and a pressure release valve is opened after the soil machine is opened, and a soil layer is fully opened.
In the continuous pressure relief process, the internal pressure of the soil bin is detected in real time, the measured pressure value in the soil bin is equal to 0MPa in real time in the second day 15:22, then the soil bin door is opened, the soil bin door is closed in the second day 16:20, the gas concentration in the soil bin is detected for a plurality of times, the detection result is recorded in a table 2, the soil bin door is opened for 53 minutes, the number of times of detecting the gas concentration in the soil bin is 8, the detection results of the 8 times all show that the gas concentration (methane concentration) in the soil bin is lower than 0.5%, and during the period, constructors enter the soil bin to finish the replacement of the 1 st abrasion cutter.
TABLE 2
| Time of | Soil bin pressure (bar) | Methane concentration (%) | Air supply quantity of foam pipeline (m 3/min) | Methane test site |
| 15:15 | 2.2 | / | 0 | / |
| 15:18 | 1.5 | / | 0 | / |
| 15:20 | 1.1 | / | 0 | / |
| 15:21 | 0.1 | / | 0 | / |
| 15:22 | 0 | / | 0 | / |
| 15:23 | 0 | 0 | 0.26 | Balanced valve air outlet |
| 15:29 | 0 | 0 | 0.26 | In the soil bin |
| 15:32 | 0 | 0.07 | 0 | In the soil bin |
| 15:38 | 0 | 0 | 0.19 | In the soil bin |
| 15:40 | 0 | 0.04 | 0.19 | In the soil bin |
| 15:45 | 0 | 0.05 | 0.19 | In the soil bin |
| 16:17 | 0 | 0.4 | 0 | Balanced valve air outlet |
| 16:20 | 0 | 0.5 | 0 | Balanced valve air outlet |
The method comprises the steps of detecting that the gas concentration value in a soil bin is greater than a gas concentration limiting value by 0.5% on the second day 16:22, withdrawing the soil bin by constructors, closing a soil bin door, continuously injecting air into the soil bin again on the second day 18:30, wherein the initial air supply amount is 2m/min, continuously injecting air for 6 hours, detecting that the measured pressure value in the soil bin is 2.1bar on the second day 24:30, reducing the initial air supply amount to a foam pipeline air supply amount, and repeatedly implementing pressure maintaining, wherein the value range of the foam pipeline air supply amount is set to be 0.15 m/min-0.30 m/min, so that the gas in the soil bin is fully transported and extruded into a stratum fracture, opening all pressure relief valves arranged on the soil bin of a soil pressure balance machine on the third day 8:31 after the pressure maintaining time is 8 hours, starting the pressure relief, opening the balance valve, the pressure relief valve and the screw machine, and discharging water in the soil bin through the screw machine after the pressure relief;
In the continuous pressure relief process, the internal pressure of the soil bin is detected in real time, the measured pressure value in the soil bin is equal to 0MPa in real time in the third day 8:38, then the soil bin door is opened, the soil bin door is opened in the third day 8:43, the soil bin door is closed in the third day 10:23, the gas concentration in the soil bin is detected for a plurality of times, the detection result is recorded in a table 3, the soil bin door is opened for 100 minutes, the number of times of detecting the gas concentration in the soil bin is 13, and the detection results for 13 times all show that the gas concentration (methane concentration) in the soil bin is lower than 0.5 percent, and in the period, constructors enter the soil bin to finish the replacement of the 2 nd abrasion cutter.
TABLE 3 Table 3
| Time of | Soil bin pressure (bar) | Methane concentration (%) | Air supply quantity of foam pipeline (m 3/min) | Methane test site |
| 8:31 | 2.1 | / | 0 | / |
| 8:33 | 1.7 | / | 0 | / |
| 8:34 | 1.2 | / | 0 | / |
| 8:35 | 0.7 | / | 0 | / |
| 8:38 | 0 | 0 | 0 | Balanced valve air outlet |
| 8:43 | 0 | 0 | 1 | In the soil bin |
| 8:50 | 0 | 0 | 1 | In the soil bin |
| 9:07 | 0 | 0.04 | 1 | In the soil bin |
| 9:24 | 0 | 0.05 | 0.2 | In the soil bin |
| 9:25 | 0 | 0.05 | 0.4 | In the soil bin |
| 9:41 | 0 | 0.08 | 0.4 | In the soil bin |
| 9:54 | 0 | 0.10 | 0.4 | In the soil bin |
| 10:08 | 0 | 0.13 | 1 | In the soil bin |
| 10:11 | 0 | 0.13 | 0.9 | In the soil bin |
| 10:17 | 0 | 0.08 | 0.9 | In the soil bin |
| 10:20 | 0 | 0.16 | 0.9 | In the soil bin |
| 10:23 | 0 | 0.17 | 1.5 | In the soil bin |
The steps one to four are repeated for a plurality of times until the replacement of all the abrasion cutters is completed, the whole cutter changing process is easy to realize and operate in a mode of repeatedly collecting the soil bin for maintaining pressure and transporting gas, the wind power locking mechanism is not triggered, the whole soil pressure balance shield machine is not powered off, and the popularization and the application are convenient.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The method for opening and changing the cutter of the pressure maintaining gas of the earth pressure balance shield machine is characterized by comprising the following steps:
step one, closing all pressure relief valves arranged on a soil bin of a soil pressure balance shield machine to keep the soil bin in a closed state;
continuously injecting air into the soil bin, and pressurizing and maintaining the pressure of the soil bin:
Continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, enabling the air supply quantity of the air compressor to be initial air supply quantity, detecting the internal pressure of the soil bin in real time in the continuous pressurizing process, and adjusting the air supply quantity of the air compressor to be foam pipeline air supply quantity after the measured pressure value in the soil bin detected in real time is larger than the maximum value of the tunnel single-hole gas emission pressure, and implementing pressure maintaining to enable the gas in the soil bin to be fully transported and extruded into stratum cracks;
step three, opening all pressure relief valves arranged on a soil bin of the soil pressure balance shield machine to relieve pressure;
In the continuous pressure relief process, detecting the internal pressure of the soil bin in real time, opening a soil bin door when the real-time detected measured pressure value in the soil bin is equal to 0MPa, detecting the gas concentration in the soil bin for a plurality of times, and when the detected gas concentration value in the soil bin is smaller than a gas concentration limiting value, the gas concentration limiting value is 0.5%, executing a step four;
step four, constructors enter the soil bin to replace abrasion cutters:
In the process of replacing the abrasion cutter, continuously injecting air into the soil bin by utilizing an air compressor and a foam pipeline, and enabling the air supply quantity of the air compressor to be the air supply quantity of the foam pipeline; detecting the gas concentration in the soil bin for multiple times, and when the detected gas concentration value in the soil bin is not smaller than a gas concentration limiting value, withdrawing the soil bin by constructors, closing a soil bin door and executing the first step;
and fifthly, repeating the first step to the fourth step for a plurality of times until the replacement of all the worn cutters is completed.
2. The method for opening and changing the cutter of the pressure maintaining migration gas of the earth pressure balance shield machine according to claim 1 is characterized in that in the second step, the initial air supply quantity is not less than 2m 3/min.
3. The pressure maintaining and gas moving tool changing method for the earth pressure balance shield machine is characterized in that in the second step and the fourth step, the range of the air supply quantity of the foam pipeline is 0.15m 3/min～1.5m3/min.
4. The pressure-maintaining gas-migration tool changing method for the earth pressure balance shield machine is characterized in that in the second step, the value range of the single-hole gas emission pressure of a tunnel is 0.08-0.14 MPa, and the value range of the measured pressure value in the earth bin is 0.15-0.3 MPa.
5. The method for opening and changing the cutter of the pressure maintaining gas of the earth pressure balance shield machine is characterized in that in the second step, the value range of the duration of implementing the pressure maintaining is 5-8 hours.
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| CN202410533022.8A CN118361250B (en) | 2024-04-30 | 2024-04-30 | Pressure maintaining, gas transporting, opening and tool changing method for earth pressure balance shield machine |
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| CN118361250B true CN118361250B (en) | 2024-12-13 |
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| CN105317441A (en) * | 2014-06-30 | 2016-02-10 | 宏润建设集团股份有限公司 | Pressure maintaining type tool changing method adopted during shield tunneling |
| CN109209402A (en) * | 2018-10-22 | 2019-01-15 | 中国电建集团铁路建设有限公司 | A kind of present low gas shield tunnel construction method |
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| JP5889645B2 (en) * | 2012-01-24 | 2016-03-22 | 日立造船株式会社 | Bit exchanging method and apparatus for shield machine |
| JP6012073B2 (en) * | 2012-12-28 | 2016-10-25 | 株式会社奥村組 | How to replace excavation members of tunnel excavator |
| CN110397444A (en) * | 2019-08-19 | 2019-11-01 | 中铁十二局集团有限公司 | Shallow earthing upper-soft lower-hard ground shield machine opens a position the method for tool changing |
| CN112576267B (en) * | 2021-02-22 | 2021-12-21 | 中铁九局集团第四工程有限公司 | Efficient normal-pressure tool changing construction method for water-rich sandy gravel stratum |
| CN114893195A (en) * | 2022-07-01 | 2022-08-12 | 安徽省公路桥梁工程有限公司 | Hard rock geological shield tunneling, warehouse opening and tool changing construction process |
| CN117211808A (en) * | 2023-07-21 | 2023-12-12 | 中建海峡建设发展有限公司 | Shield method zoned bin filling normal-pressure tool changing construction method |
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| CN105317441A (en) * | 2014-06-30 | 2016-02-10 | 宏润建设集团股份有限公司 | Pressure maintaining type tool changing method adopted during shield tunneling |
| CN109209402A (en) * | 2018-10-22 | 2019-01-15 | 中国电建集团铁路建设有限公司 | A kind of present low gas shield tunnel construction method |
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