CN209976568U - Low gas stratum shield construction ventilation system - Google Patents
Low gas stratum shield construction ventilation system Download PDFInfo
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- CN209976568U CN209976568U CN201920358120.7U CN201920358120U CN209976568U CN 209976568 U CN209976568 U CN 209976568U CN 201920358120 U CN201920358120 U CN 201920358120U CN 209976568 U CN209976568 U CN 209976568U
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Abstract
A ventilation system for shield construction of a low gas stratum comprises a power system, an air supply system and a detection feedback system. The utility model adopts two axial flow fans with the same model, thereby enhancing the reliability of the system; the power supply of the fan is provided with a double-circuit power supply, so that the reliability of power supply of the system is ensured; the system has a perfect detection feedback system, and improves the construction safety; when the concentration of gas in the tunnel is higher and exceeds the limit value, the shield stops tunneling; when power is supplied or the fan fails and ventilation of the tunnel cannot be performed, the system automatically cuts off the power supply of the shield machine and stops tunneling; the ventilation of the tunnel adopts a mode of combining main ventilation and local ventilation, fresh air is pressed in at the tunnel entrance by adopting an axial flow fan, and local fans are arranged at the upper part of the shield machine trolley and in the shield body, so that the local air speed is improved, the gas accumulation is prevented, and the tunnel ventilation effect is effectively ensured; the fan can adjust the wind speed according to the site operation condition and the gas concentration in the tunnel, and is flexible and variable.
Description
Technical Field
The utility model belongs to the technical field of the tunnel construction, concretely relates to low gas stratum shield constructs construction ventilation system.
Background
The shield construction of the low gas stratum has strict requirements on the ventilation of the tunnel due to the particularity of the stratum. The specific requirements are as follows:
adopting press-in type ventilation;
the air return speed in the tunnel is not less than 1m/s, so that gas is prevented from gathering;
the gas concentration at each position in the tunnel is not higher than 0.5%;
and uninterrupted ventilation is required to be realized, and when one path of power supply of the fan stops supplying power, the other path of power supply is switched on within 10min, so that the normal operation of the fan is ensured.
The existing shield construction ventilation system cannot meet the requirements, so that the low-gas stratum shield construction ventilation system has the functions of uninterrupted ventilation, alarming, automatic shield machine power supply cutting and the like, and meets the requirements of low-gas stratum shield construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low gas stratum shield constructs construction ventilation system, this system need higher security and reliability to the special construction environment in gas tunnel, whole ventilation system, and the capital equipment all is furnished with one set of equal ability standby equipment. The double fans are two axial flow fans with the same model, and when the main fan fails, the auxiliary fan is started, so that the reliability of the system is enhanced; the power supply of the fan is provided with two paths of power supplies, one path is an external power grid, the other path is an emergency generator, and after the external power grid is powered off, the emergency generator is started to ensure the reliability of system power supply; the ventilation system is provided with a perfect detection feedback system, can automatically make a corresponding response to an emergency accident occurring on the site, and sends out an alarm signal to prompt the site constructor to withdraw in case of emergency, so that the construction safety is improved. When the gas concentration in the tunnel is higher and exceeds the limit value, the system automatically realizes the watt-hour blocking, the shield stops tunneling, and constructors withdraw; when the tunnel ventilation cannot be carried out due to power supply or fan failure, the system automatically cuts off the power supply of the shield machine, the tunneling is stopped, and constructors withdraw; the ventilation of the tunnel adopts a mode of combining main ventilation and local ventilation, fresh air is pressed in at the tunnel entrance by adopting an axial flow fan, and a local fan is arranged at the upper part of the shield machine trolley, so that the local wind speed is improved, the gas accumulation is prevented, and the tunnel ventilation effect is effectively ensured. The wind speed can be adjusted according to the site operation condition and the gas concentration in the tunnel by the fan, so that the wind speed is flexible and variable, the site operation can be met, and the construction safety can be ensured.
In order to achieve the above object, the utility model adopts the following technical scheme:
the low gas stratum shield construction ventilation system comprises a power system, an air supply system and a detection feedback system; the air supply system comprises a ventilation control device, a high-power axial flow type double fan, a local fan, a fan control cabinet, a Y-shaped hard air pipe and a large-diameter air cylinder, wherein the fan control cabinet is used for controlling the starting and stopping of the high-power axial flow type double fan; the detection feedback system comprises an air speed sensor, a fan start-stop detector, a gas concentration sensor, a shield machine locking device and an alarm device, and the ventilation control device is respectively connected with the air speed sensor, the fan start-stop detector, the gas concentration sensor, the shield machine locking device and the alarm device.
Further, power supply system includes external electric wire netting, emergency generator and generator starting cabinet, external electric wire netting is given through high-voltage ring main unit air feed system and detection feedback system power supply and detection feedback system still have independent stand-by power supply, can continue to supply power for it for a period of time after the external net outage, emergency generator is in give under generator starting cabinet's control air feed system and detection feedback system power supply.
Further, the high-power axial-flow type double fans comprise a main fan and a standby fan, and the main fan and the standby fan are both arranged outside the shield construction tunnel.
Furthermore, the number of the local fans is 15, wherein 3 local fans are arranged in the shield body, and the other 12 local fans are averagely arranged on the six trolleys.
Further, the diameter of the large-diameter air duct is 1.4 m.
Further, the fan start-stop detector is a current transformer.
Furthermore, the alarm device comprises a loudspeaker sound alarm device and an LED flash lamp alarm device.
Furthermore, an air source guiding device is arranged in the middle of the Y-shaped hard air pipe.
The utility model has the beneficial technical effects that: the double fans are two axial flow fans with the same model, and when the main fan fails, the auxiliary fan is started, so that the reliability of the system is enhanced; the power supply of the fan is provided with two paths of power supplies, one path is an external power grid, the other path is an emergency generator, and after the external power grid is powered off, the emergency generator is started to ensure the reliability of system power supply; the ventilation system is provided with a perfect detection feedback system, can automatically make corresponding response to the sudden accidents on site, and sends out an alarm signal to prompt the site constructors to withdraw in case of emergency, so that the construction safety is improved; when the gas concentration in the tunnel is higher and exceeds the limit value, the system automatically realizes the watt-hour blocking, the shield stops tunneling, and constructors withdraw; when the tunnel ventilation cannot be carried out due to power supply or fan failure, the system automatically cuts off the power supply of the shield machine, the tunneling is stopped, and constructors withdraw; the ventilation of the tunnel adopts a mode of combining main ventilation and local ventilation, fresh air is pressed in at the tunnel entrance by adopting an axial flow fan, and a local fan is arranged at the upper part of the shield machine trolley, so that the local wind speed is improved, the gas accumulation is prevented, and the tunnel ventilation effect is effectively ensured; the wind speed can be adjusted according to the site operation condition and the gas concentration in the tunnel by the fan, so that the wind speed is flexible and variable, the site operation can be met, and the construction safety can be ensured.
Drawings
Fig. 1 is a schematic view of the distribution of the ground ventilation equipment of the present invention.
Fig. 2 is the utility model discloses a station medium plate ventilation equipment distribution schematic diagram.
Fig. 3 is the distribution schematic diagram of the ventilation equipment in the tunnel of the present invention.
Fig. 4 is a schematic structural diagram of the Y-shaped hard air duct of the present invention.
Wherein, the high-power axial flow type double fans 4
Local fan 5
Y-shaped hard air duct 7
Large-diameter air duct 8
Wind speed sensor 9
Fan start-stop detector 10
Shield machine locking device 11
Alarm device 12
External power grid 1
Emergency generator 2
Generator starting cabinet 3
Main blower branch pipe 71
Spare fan branch pipe 72
Wind source guide plate 73
A manifold 74.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to fig. 1 to 4 of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1, 2 and 3, the low-gas stratum shield construction ventilation system comprises a power system, a wind supply system and a detection feedback system; the air supply system comprises a ventilation control device, a high-power axial flow type double fan 4, a local fan 5, a fan control cabinet 6, a Y-shaped hard air pipe 7 and a large-diameter air cylinder 8, wherein the fan control cabinet 6 is used for controlling the starting and stopping of the high-power axial flow type double fan 4, the high-power axial flow type double fan 4 serves as an air source to provide fresh air, the fresh air sequentially passes through the Y-shaped hard air pipe 7 and the large-diameter air cylinder 8 and then is fed into a shield construction tunnel, the ventilation control device is respectively connected with the fan control cabinet 6 and the local fan 5, and the local fan 5 is installed inside the shield and on a trolley; the detection feedback system comprises an air speed sensor 9, a fan start-stop detector 10, a gas concentration sensor, a shield machine locking device 11 and an alarm device 12, and the ventilation control device is respectively connected with the air speed sensor 9, the fan start-stop detector 10, the gas concentration sensor, the shield machine locking device 11 and the alarm device 12; wherein, the wind speed sensor 9 is arranged at the tail end of the large-diameter wind cylinder 8 and is used for detecting the real-time wind speed of fresh wind in the large-diameter wind cylinder 8; the fan start-stop detector 10 is arranged on the high-power axial flow type double fans 4 and is used for detecting the working state of the high-power axial flow type double fans 4; the gas concentration sensor is arranged on the outer side of the shield machine and used for detecting the gas concentration in the shield construction tunnel in real time; the shield machine locking device 11 is arranged on the high-voltage ring main unit and used for cutting off an external power supply of the shield machine; the alarm device 12 is installed on the shield machine and used for reminding workers that the shield machine is in an abnormal state, wherein the abnormal state comprises that the shield machine stops tunneling, a fan fails, the fan is powered off, the wind speed in a tunnel is lower than a limit value, and the gas concentration exceeds an alarm value or a limit value. The power supply system comprises an external power grid 1, an emergency generator 2 and a generator starting cabinet 3, the external power grid supplies power to the air supply system and the detection feedback system through a high-voltage ring main unit, and the emergency generator 2 supplies power to the air supply system and the detection feedback system under the control of the generator starting cabinet 3. The high-power axial flow type double fans 4 comprise a main fan and a standby fan, and the main fan and the standby fan are both arranged outside the shield construction tunnel. The number of the local fans 5 is 15, wherein 3 local fans 5 are arranged in the shield body, and the other 12 local fans 5 are averagely arranged on the six-section trolley. The diameter of the large-diameter air duct 8 is 1.4 m. The fan start-stop detector 10 is a current transformer. The alarm device 12 comprises a loudspeaker sound alarm device and an LED flash lamp alarm device. And an air source guiding device is arranged in the middle of the Y-shaped hard air pipe 7.
The working principle of the scheme is briefly described as follows:
when the shield machine is normally tunneling;
in order to ensure the normal breathing of constructors and the safe operation of equipment, when the shield tunneling machine is normally propelled, the high-power axial flow fan outside the tunnel is started, and when the shield tunneling machine is normally constructed, only the main fan is started. A large amount of fresh air generated by the high-power axial flow fan enters the tunnel through the Y-shaped hard air pipe and the large-diameter air cylinder, and normal ventilation is realized in the tunnel; 15 local explosion-proof fans on the trolley in the tunnel and in the shield body are started, and gas gathered above the trolley and in the shield body can be blown away. And when the wind speed sensor in the tunnel detects that the return wind speed meets the requirement, the shield machine can shift to a tunneling mode for tunneling. When the shield normally advances, the power supply of the high-power axial flow fan is provided by an external power grid, the start-stop sensor detects that the fan normally operates, the wind speed sensor in the tunnel detects that the return air speed meets the requirement, and the alarm device is not triggered to perform sound-light alarm.
When the external network is powered off, the following three situations are specifically provided;
(1) the fan outage, when the shield constructs the machine and does not cut off the power supply: when the external power grid of fan cuts off the power supply, high-power axial-flow fan stop the operation, and the tunnel ventilation stops, and air velocity transducer detects that return air wind speed is less than the alarm value, reports to the police, gives the shield structure machine outage instruction to the wind-powered electricity locking device simultaneously. And the wind power locking device immediately cuts off the shield machine after receiving the instruction, the tunneling is suspended, and the field management personnel organize the evacuation of the personnel in the tunnel. The personnel on duty start the emergency generator in external power network outage 10min, or adopt and set up automatic start in the generator start cabinet, automatic start includes time-recorder and relay, the time-recorder is connected with the relay, the time-recorder still with current transformer, the switch-on of starting the emergency generator in relay and the generator control cabinet, drive time-recorder and begin the timing when current transformer detects the fan outage, the timing of time-recorder sends a high level to the relay and switches on the relay when 10min, the switch of emergency generator is opened to the relay, the air supply system resumes, air velocity transducer detects that the wind speed is normal, stop the warning, resume shield structure machine power, normal tunnelling. And after the power supply of the external power grid is recovered to be normal, switching the power supply of the high-power axial flow fan into the power supply of the external power grid.
(2) The shield constructs the quick-witted outage, and when the fan did not cut off the power supply: when the external power grid of the shield machine is powered off, the low-gas stratum shield construction ventilation system normally operates, the shield stops tunneling, the alarm device gives an alarm, field management personnel organize personnel in the tunnel to evacuate, the external power grid is waited to be normal, and tunneling is resumed.
(3) When the shield machine and the fan are powered off simultaneously: when the shield machine and the fan are powered off, the shield machine and the high-power axial flow fan stop running, the ventilation of the tunnel stops, and the tunneling stops. And the wind speed sensor detects that the return wind speed is lower than an alarm value, an alarm is given, and field management personnel organize the evacuation of the personnel in the tunnel. And (3) starting the emergency generator to supply power to the ventilation system by adopting the method in the step (1), and recovering ventilation and tunneling after the external power grid is normally supplied with power.
Example 2:
as shown in fig. 4, based on embodiment 1, the Y-shaped rigid duct 7 further includes a main blower branch duct 71, a standby blower branch duct 72, an air source guide vane 73 and a collecting duct 74, wherein the main blower branch duct 71 is communicated with the main blower, the standby blower branch duct 72 is communicated with the standby blower, one end of the air source guide vane 73 is movably connected to a junction of the main blower branch duct 71 and the standby blower branch duct 72, the main blower branch duct 71 and the standby blower branch duct 72 are combined in the collecting duct 74, and the collecting duct 74 is communicated with the large-diameter wind tunnel 8.
When the main fan works and the standby fan is closed: the tail end C of the air source guide vane 73 is deviated to the end B of the standby fan branch pipe 72 under the action of wind power, at the moment, the main fan branch pipe 71 is communicated with the collecting pipe 74, and the standby fan branch pipe 72 is isolated from the collecting pipe 74.
When the standby fan works and the main fan is closed: the tail end C of the air source guide vane 73 deflects to the end A of the main fan branch pipe 71 under the action of wind power, at the moment, the main fan branch pipe 71 is isolated from the collecting pipe 74, and the standby fan branch pipe 72 is communicated with the collecting pipe 74.
Moreover, the wind source guide plate 73 is made of a light wind-proof material.
Example 3:
on the basis of embodiment 2, further, in order to ensure that the tail end C of the air source guide vane 73 is more stable and better in sealing performance when the main fan works and the standby fan works, in the Y-shaped hard air duct 7, the inner wall of the main fan branch pipe 71 is provided with a first fluid sensor, a first relay and a first electromagnet, the first fluid sensor, the first relay and the first electromagnet are sequentially connected, the inner wall of the standby fan branch pipe 72 is provided with a second fluid sensor, a second relay and a second electromagnet, the second fluid sensor, the second relay and the second electromagnet are sequentially connected, and the tail end C of the air source guide vane 73 is provided with a magnetic material.
When the main fan works and the standby fan is closed: the first fluid sensor detects a wind source signal and sends a high level to the first relay to conduct the first relay, the first relay enables the first electromagnet to be electrified and work, the first electromagnet attracts a magnetic material arranged at the tail end C of the wind source guide sheet 73, and therefore the tail end C of the wind source guide sheet 73 is closed with the end B of the standby fan branch pipe 72.
When the standby fan works and the main fan is closed: the second fluid sensor detects a wind source signal and sends a high level to the second relay to conduct the second relay, the second relay enables the second electromagnet to be electrified to work, the second electromagnet attracts a magnetic material arranged at the tail end C of the wind source guide sheet 73, and therefore the tail end C of the wind source guide sheet 73 is closed with the end A of the standby fan branch pipe 72.
In the description of the present invention, it should be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Claims (8)
1. The low gas stratum shield construction ventilation system is characterized by comprising a power system, an air supply system and a detection feedback system; the air supply system comprises a ventilation control device, a high-power axial flow type double fan (4), a local fan (5), a fan control cabinet (6), a Y-shaped hard air pipe (7) and a large-diameter air cylinder (8), wherein the fan control cabinet (6) is used for controlling the starting and stopping of the high-power axial flow type double fan (4), the high-power axial flow type double fan (4) serves as an air source to provide fresh air, the fresh air is sent into a shield construction tunnel after sequentially passing through the Y-shaped hard air pipe (7) and the large-diameter air cylinder (8), the ventilation control device is respectively connected with the fan control cabinet (6) and the local fan (5), and the local fan (5) is installed inside a shield body and on a trolley; the detection feedback system comprises an air speed sensor (9), a fan start-stop detector (10), a gas concentration sensor, a shield machine locking device (11) and an alarm device (12), and the ventilation control device is respectively connected with the air speed sensor (9), the fan start-stop detector (10), the gas concentration sensor, the shield machine locking device (11) and the alarm device (12).
2. The low-gas stratum shield construction ventilation system according to claim 1, wherein the power system comprises an external power grid (1), an emergency generator (2) and a generator starting cabinet (3), the external power grid supplies power to the air supply system and the detection feedback system through a high-voltage ring main unit, the detection feedback system is further provided with an independent standby power supply, the external power grid can be continuously supplied with power for a period of time after being powered off, and the emergency generator (2) supplies power to the air supply system and the detection feedback system under the control of the generator starting cabinet (3).
3. The low gas stratum shield construction ventilation system of claim 1, characterized in that the high power axial flow type double fan (4) comprises a main fan and a backup fan, and the main fan and the backup fan are both installed outside the shield construction tunnel.
4. The low gas stratum shield construction ventilation system of claim 1, characterized in that the local fans (5) are 15 in total, wherein 3 local fans (5) are arranged in the shield body, and the other 12 local fans (5) are equally distributed on six trolleys.
5. The low-gas stratum shield construction ventilation system according to claim 1, wherein the diameter of the large-diameter wind tube (8) is 1.4m, and the material is flame-retardant and antistatic polyethylene mining wind tube cloth.
6. The low gas stratum shield construction ventilation system of claim 1, wherein the fan start-stop detector (10) is a current transformer.
7. The low gas formation shield construction ventilation system of claim 1, wherein the alarm device (12) comprises a speaker sound alarm device and an LED flashlight alarm device.
8. The low-gas stratum shield construction ventilation system according to claim 1, wherein an air source guiding device is arranged in the middle of the Y-shaped hard air pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920358120.7U CN209976568U (en) | 2019-03-20 | 2019-03-20 | Low gas stratum shield construction ventilation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920358120.7U CN209976568U (en) | 2019-03-20 | 2019-03-20 | Low gas stratum shield construction ventilation system |
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| Publication Number | Publication Date |
|---|---|
| CN209976568U true CN209976568U (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920358120.7U Expired - Fee Related CN209976568U (en) | 2019-03-20 | 2019-03-20 | Low gas stratum shield construction ventilation system |
Country Status (1)
| Country | Link |
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| CN (1) | CN209976568U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677541A (en) * | 2020-06-30 | 2020-09-18 | 中国水利水电第五工程局有限公司 | Safe construction ventilation method for large-diameter earth pressure balance shield of low-gas tunnel |
| CN112502764A (en) * | 2020-11-26 | 2021-03-16 | 中电建路桥集团有限公司 | Y-shaped balance ventilator for long and large tunnel construction period |
-
2019
- 2019-03-20 CN CN201920358120.7U patent/CN209976568U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677541A (en) * | 2020-06-30 | 2020-09-18 | 中国水利水电第五工程局有限公司 | Safe construction ventilation method for large-diameter earth pressure balance shield of low-gas tunnel |
| CN112502764A (en) * | 2020-11-26 | 2021-03-16 | 中电建路桥集团有限公司 | Y-shaped balance ventilator for long and large tunnel construction period |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200121 Termination date: 20210320 |