CN110043307B - Tidal basin biogas release method - Google Patents
Tidal basin biogas release method Download PDFInfo
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- CN110043307B CN110043307B CN201910213806.1A CN201910213806A CN110043307B CN 110043307 B CN110043307 B CN 110043307B CN 201910213806 A CN201910213806 A CN 201910213806A CN 110043307 B CN110043307 B CN 110043307B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 126
- 239000002689 soil Substances 0.000 claims abstract description 55
- 238000010276 construction Methods 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 100
- 238000009434 installation Methods 0.000 claims description 32
- 230000003068 static effect Effects 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 12
- 241001580947 Adscita statices Species 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 8
- 231100000572 poisoning Toxicity 0.000 abstract description 4
- 230000000607 poisoning effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a tidal basin biogas release method, which comprises the following steps: 1) measuring and lofting; 2) installing an air discharging device; 3) discharging the biogas; 4) dismantling the device and recovering on site; the device is mainly used for carrying out micro-disturbance high-pressure methane release on a soft soil layer, and can be used in cooperation with a flow control adjusting device, the device is convenient to install and fast to carry, methane can be released quickly, accurately and economically at a determined discharge point, and methane in the deep soil layer can be released, a large amount of labor cost can be saved, the methane content in the ground layer is reduced to a safe range, the risks of explosion and poisoning during shield tunnel construction can be thoroughly solved, the influence of deflation on surrounding structures can be avoided, and the influence of methane release on soil disturbance is reduced.
Description
Technical Field
The invention relates to the technical field of subway engineering, in particular to a tidal basin biogas release method.
Background
Biogas, also called gas, is a combustible gas without color and odor produced by various organic substances through the fermentation of microorganisms under the conditions of air isolation and proper temperature and humidity, and the main component of the combustible gas is methane.
In the shield tunnel construction penetrating through a methane stratum, the leakage into the shield tunnel is the only way for methane to flow, and when the tunnel is filled with methane, constructors can hardly find the methane. When the gas is accumulated to a certain concentration, the gas can be burnt and exploded when meeting fire, thereby causing serious consequences; if the gas concentration is too high, suffocation and even death of people can be caused. In addition, the methane is released, so that the underlying soil layer can be unstable, the built tunnel is displaced and broken, irrecoverable great economic loss is caused, and the hazard is great.
In order to solve the problems, the prior art adopts a common drilling discharge method and a static pressure single (double) pipe discharge method to discharge the methane. The common drilling discharge method is high in construction speed, but influences on buildings on the bottom surface are difficult to control, so that in subway engineering, a static pressure double-pipe is mainly adopted for methane discharge, the outer diameter of a probe rod is about 42mm, the discharge is in a natural state, the discharge flow can be controlled, damage to surrounding soil layers is greatly reduced, the static pressure double-pipe discharge method generally needs 4 workers for operation, two workers need special pipe cranks, equipment carrying and installation are complex, certain technical requirements on the static pressure double-pipe operation are met, due to the fact that the soil layer of a tidal basin is a mucky soil layer, the methane has small flowability under the influence of the mucky soil layer, the pressure and the flow are small, blockage of the discharge pipe or the small pressure difference can be caused frequently due to the adoption of static pressure discharge, and beating can be caused, and manpower and material resources are wasted.
Disclosure of Invention
The invention aims to provide a technical scheme of a tidal basin methane release method aiming at the defects in the prior art, mainly aims at carrying out micro-disturbance high-pressure methane release on a soft soil layer, can provide a device improved static penetrometer which is convenient to install and fast to carry, is matched with a flow control adjusting device for use, can quickly, accurately and economically release methane on a determined discharge point, can release methane on a deep soil layer, can save a large amount of labor cost, reduces the methane content in the ground layer to a safe range, can thoroughly solve the risks of explosion and poisoning during shield tunnel construction, can avoid the influence of deflation on surrounding structures, and reduce the influence of methane release on soil body disturbance, and can collect and intensively process the methane released by the soil layer by adopting the release method provided by the invention, thoroughly eradicates the adverse effect caused by harmful gas.
In order to solve the technical problems, the invention adopts the following technical scheme:
a tidal basin biogas release method is characterized in that: the method comprises the following steps:
1) measuring and lofting:
firstly, determining the spacing and the plane position of the vent holes according to a survey report; according to an investigation report of the early stage of the project, the plane position of the discharge hole is determined in advance, and construction basis is provided for methane discharge;
2) installing an air discharging device:
a. in situ installation of support devices
Firstly, respectively sleeving two ends of an I-shaped fixing frame on an auxiliary pipe supporting seat and a main pipe supporting seat, enabling mounting holes of the I-shaped fixing frame to respectively correspond to the mounting holes on the auxiliary pipe supporting seat and the main pipe supporting seat, and fixedly connecting and screwing two sides of the I-shaped fixing frame with the auxiliary pipe supporting seat and the main pipe supporting seat by using a stud and a nut, so that the auxiliary pipe supporting seat and the main pipe supporting seat form a supporting device together; the main pipe supporting seat and the auxiliary pipe supporting seat can be installed together through the I-shaped fixing frame, the fixed connection of the main pipe supporting seat and the auxiliary pipe supporting seat can be realized, the space between the main pipe and the auxiliary pipe can be strictly ensured, the step of measuring the distance between the main pipe and the auxiliary pipe on site is omitted, and the supporting device only needs to be assembled once in one project and can be used for methane release of exhaust holes at other positions;
b. fixed adjustment of support device
Then, the supporting device is placed on the ground of a construction site, an auxiliary pipe through hole in the auxiliary pipe supporting seat is positioned right above the discharge hole, the heights of lifting support legs below the auxiliary pipe supporting seat and the main pipe supporting seat are respectively adjusted according to the display of a level gauge on the I-shaped fixing frame, the upper planes of the auxiliary pipe supporting seat and the main pipe supporting seat are kept horizontal, then the pin is knocked by a hammer from the top, and the bottom of the pin sequentially penetrates through pin holes of the auxiliary pipe supporting seat and the main pipe supporting seat and is sunk into a soil layer by at least 10 cm; the height of the lifting support leg of the supporting device can be adjusted in time through the indication of the level gauge, so that the upper planes of the main pipe supporting seat and the auxiliary pipe supporting seat are kept horizontal, the pressurizing device and the exhaust device can be correspondingly installed, the structure of the lifting support leg can be fixed by knocking the pin into the soil layer from the top, the main pipe supporting seat and the auxiliary pipe supporting seat are fixedly connected with the ground, the supporting device can be directly installed on the surface of the soil layer, the surface level of the supporting device can be ensured by adjusting the supporting device to adapt to the shape of the ground, the fixing of the supporting device and the ground can be ensured, the surface of the soil layer does not need to be trimmed to ensure the level of the supporting device, the pit digging work when the static force detector is installed in the traditional methane release method can be reduced, the input cost of manpower and material resources can be reduced, and according to the installation method provided by, the main pipe and the auxiliary pipe can be more conveniently installed, and the whole structure is more stable;
c. mounting of pressure devices
The method comprises the following steps that four groups of fixing seats are oppositely clamped on two sides of a main pipe supporting seat and an auxiliary pipe supporting seat in sequence in pairs, the bottom end face of a U-shaped adjusting rod is placed on the top of a supporting device, the horizontal end faces of the fixing seats are tightly attached to the bottom of the supporting device, the fixing seats are installed in reserved installation holes in the side faces of the supporting device at corresponding positions by adopting studs, the fixing seats are fixedly connected with the supporting device, the positions of the fixing seats on the supporting device are adjusted, bearing plates on the two groups of fixing seats which are oppositely arranged are aligned, connecting parts of the two groups of fixing seats which are oppositely arranged are fixed by using fixing plates to form through grooves, and the two groups of fixing; the fixing seats and the U-shaped adjusting rods are fixedly welded, the bottom end faces of the U-shaped adjusting rods are placed on the supporting devices, and the two groups of bearing plates of the fixing seats are aligned through adjustment, so that the bearing plates can be aligned and fixedly connected, and the connection parts of the through grooves are smooth;
d. mounting of exhaust devices
The method comprises the following steps of firstly, fixedly connecting a main pipe and an auxiliary pipe with a piston rod of an air cylinder assembly in a threaded connection mode respectively, then placing the air cylinder assembly on a fixed seat, enabling an adjusting screw to penetrate through an installation column, enabling an extension plate to be placed on a supporting plate on the fixed seat, ensuring that two side faces of the extension plate are aligned with two side faces of the supporting plate, then determining the installation height of the air cylinder assembly according to survey data, determining the installation position of the air cylinder assembly by adjusting the position of a first nut on the screw, screwing a second nut, fixing the installation column and the screw from the upper side, and finally fixing the extension plate and the supporting plate by using a connecting piece; when installing the cylinder subassembly, make adjusting screw pass the erection column, adjusting screw plays certain limiting displacement to the erection column, place the extension board in the cylinder subassembly in the backup pad on the fixing base, and the purpose that makes the both sides face of extension board and the both sides face of backup pad align is to guarantee that the cylinder mounting panel can be located and wear the groove directly over, can guarantee that follow-up person in charge and accessory pipe can pass through the fixed plate smoothly and by the static pressure to the soil layer in, adjust the home position of cylinder subassembly through the analysis to surveying data, can play the bandwagon effect to the position of erection column through the adjustment to first nut position, restrict the erection column in the top of first nut.
3) Discharging biogas:
a. static pressure main pipe and auxiliary pipe to a predetermined depth
Firstly, ensuring that a pressurizing pipe valve and an exhaust pipe valve above a main pipe and an auxiliary pipe are kept closed, then driving an auxiliary pipe cylinder, carrying out static pressure on the auxiliary pipe from a preset exhaust hole to a soil layer until the auxiliary pipe reaches a preset depth under the thrust action of the auxiliary pipe cylinder, and then starting the main pipe cylinder to ensure that the main pipe is subjected to static pressure to the same depth as the auxiliary pipe under the thrust action of the main pipe cylinder; the cylinder assembly is started, a piston rod of the cylinder assembly is directly connected with the tops of the main pipe and the auxiliary pipe, the descending heights of the main pipe and the auxiliary pipe can be accurately controlled through the control of the cylinder assembly, the main pipe and the auxiliary pipe are vertically pressed into the preset depth of the soil layer through the pressure action of the cylinder assembly on the main pipe and the auxiliary pipe, the driving force and the speed of the main pipe and the auxiliary pipe can be ensured to be constant through the cylinder assembly, and the static pressure action can be better controlled;
b. pressure in the tube
Then connecting the pressure pipe of the auxiliary pipe with an inflating pump, opening a pressure pipe valve of the auxiliary pipe, simultaneously opening an exhaust pipe valve of the main pipe, stopping the operation of the inflating pump when detecting that the gas flow rate at the exhaust pipe valve of the main pipe exceeds the output flow rate of the inflating pump, closing both the pressure pipe valve of the auxiliary pipe and the exhaust pipe valve of the main pipe, then pressing the main pipe downwards by using a main pipe cylinder, injecting air into the main pipe from the pressure pipe of the main pipe by using an air compressor, then opening the exhaust pipe valve of the auxiliary pipe, and recording the outlet flow of the exhaust pipe; the pressurizing pipe of the auxiliary pipe is connected with the inflating pump, the valve of the pressurizing pipe is opened, so that the gas in the inflating pump can enter the auxiliary pipe, if the auxiliary pipe is blocked, the gas pressure in the auxiliary pipe can be increased along with the continuous input of the inflating pump to the auxiliary pipe, sludge and the like blocked in the auxiliary pipe can fall off to play a role of washing the pipe, the valve of the exhaust pipe of the main pipe is opened, the dangerous conditions that the gas pressure in the gas-containing layer is increased by the gas input of the inflating pump under the condition that the auxiliary pipe is unblocked to cause gas explosion and the like can be prevented, so that the unblocked valve of the exhaust pipe of the main pipe can maintain the relatively stable gas pressure value in the gas-containing layer, along with the gas input of the inflating pump, the harmful gas and the input air in the gas-containing layer can overflow through the exhaust pipe of the main pipe, when the gas flow rate measured at the valve of the exhaust pipe of the main pipe exceeds the input rate of the inflating pump, the harmful gas in the gas-containing layer, therefore, the main pipe and the auxiliary pipe are in a smooth state, then an exhaust pipe valve of the main pipe and a pressure pipe valve of the auxiliary pipe are closed, the work of the inflating pump is stopped, the pipe washing work of the auxiliary pipe is completed, the main pipe is moved downwards for a certain distance by using the air cylinder assembly on the premise that the main pipe and the auxiliary pipe are kept smooth, so that a height difference is formed between the main pipe and the auxiliary pipe, the gas introduced into the gas-containing layer through the main pipe is converged at the bottom outlet of the main pipe, namely, a certain distance is kept below the outlet of the auxiliary pipe, the gas in the gas-containing layer can be preferentially discharged through the auxiliary pipe, the gas mobility during methane discharge is increased, the methane release work is smoother and more efficient, air is pressed into the main pipe by using the air compressor, the gas pressure in the gas-containing layer is increased, and the methane discharge rate from the auxiliary pipe is increased;
c. collection of harmful gases
Collecting harmful gas discharged from the exhaust pipes of the auxiliary pipe and the main pipe into a conveying pipeline, and discharging the harmful gas into a collecting bag through the conveying pipeline; most of biogas is discharged to the outside through the auxiliary pipe and the exhaust pipe of the auxiliary pipe, when the auxiliary pipe is washed before the biogas is released, a small part of harmful gases such as biogas can enter the main pipe and the exhaust pipe of the main pipe, all the discharged harmful gases can be collected into the collection bag through the conveying pipeline, the collection bag is a bidirectional gas valve gas collection device, the gas of the collection bag can be prevented from flowing back into the conveying pipeline, meanwhile, the collection bag is adopted to collect the biogas, the biogas and other harmful gases can be completely collected without polluting the air, meanwhile, the collection bag is light in weight, a large amount of gas can be stored and carried, and the harmful gases are transported out and then are uniformly treated;
4) dismantling the device and recovering the device on site:
the main pipe and the auxiliary pipe are respectively lifted out of the soil by using the main pipe cylinder and the auxiliary pipe cylinder until the initial state is recovered, then the pressure pipes of the main pipe and the auxiliary pipe are respectively connected with an inflating pump, the main pipe and the auxiliary pipe are subjected to high-pressure pipe washing by using the inflating pump, a valve of the pressure pipe is opened, the inflating pump is adjusted to ensure that the output flow rate of the inflating pump is kept above 50L/min and lasts for at least 20s, then the connecting part between the supporting seat and the pressurizing device is dismantled and is separately transported to the next discharge hole for installation, meanwhile, the surface of the discharge hole is filled with the on-site original soil, the thickness of a soil filling layer is ensured to be at least 10cm, and the surface is compacted; utilize the inflating pump to be responsible for and the accessory pipe carries out high pressure washing pipe respectively, be responsible for after using and attach the pipe and carry out cleaning work, the in-process pressurized tube valve of washing the pipe is opened, make high-pressure gas can get into to be responsible for and attach intraductal through the pressurized tube, high-pressure gas is through being responsible for and when attaching the intraductal wall, can wash away the dregs of earth of adhesion on the inner wall, and take out from the bottom export of being responsible for and attaching the pipe, velocity of flow control through the inflating pump lets in gaseous effect dynamics size, at least duration can guarantee that the time of ventilating is enough to accomplish washing pipe work, carry out the work of filling out to the discharge hole after the release, can guarantee the structural stability of soil layer, greatly reduced is to the structural damage of soil layer on.
Further, the output flow rate of the inflating pump is 5L/min; the flow rate of the inflating pump is controlled to be 5L/min, so that the blockage situation inside the auxiliary pipe can be cleared by input air, and the dangerous situations that the flow rate is too high, the time is difficult to control when the air is input, the volume of the input air is too large, the gas pressure in a gas-containing layer is increased rapidly, explosion is induced and the like can be prevented;
further, in the exhaust process, if the flow velocity of the auxiliary pipe exhaust pipe is reduced, an air compressor is adopted to continuously inject air with the pressure of 0.7Mpa into the main pipe pressurization pipe, if the auxiliary pipe exhaust pipe has methane sprayed out, the auxiliary pipe exhaust pipe continues, if no methane is discharged, the auxiliary pipe exhaust pipe stands for 3-5min, and the discharge work is finished; in the exhaust process, the flow velocity of the exhaust pipe of the accessory pipe is reduced, which can indicate that the exhausted methane is reduced, the exhaust methane is reduced, which indicates that the accessory pipe is blocked or the methane allowance in the gas-containing layer is reduced, and when the gas in the gas-containing layer is exhausted, the standing time is 3-5min, which can reserve sufficient time for the exhaust work.
Further, the tube bottom of the main tube is 100-500mm below the tube bottom of the auxiliary tube; the bottom of the main pipe is still positioned in the gas-containing layer at a proper distance, and the air entering the gas-containing layer through the main pipe can be ensured to preferentially enter the bottom of the gas-containing layer, so that the original harmful gases such as methane and the like in the gas-containing layer are pressed into the auxiliary pipe and discharged through the exhaust pipe, and the methane is released.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
in the invention, the main pipe supporting seat and the auxiliary pipe supporting seat can be installed together through the I-shaped fixing frame, the fixed connection of the main pipe supporting seat and the auxiliary pipe supporting seat can be realized, the space between the main pipe and the auxiliary pipe can be strictly ensured, the step of measuring the distance between the main pipe and the auxiliary pipe on site is omitted, the supporting device only needs to be assembled once in one project, the methane release can be carried out through the exhaust holes at other positions, the height of the lifting support leg of the supporting device can be timely adjusted through the indication of a level gauge, the upper plane of the main pipe supporting seat and the auxiliary pipe supporting seat can be kept horizontal, the corresponding installation of a pressurizing device and an exhausting device is ensured, the structure of the lifting support leg can be fixed by knocking pins into the soil layer from the top, the main pipe supporting seat and the auxiliary pipe supporting seat are fixedly connected with the ground, and, the supporting device is adjusted to adapt to the shape of the ground so as to ensure the surface level of the supporting device, the supporting device can be fixed with the ground, the surface of a soil layer does not need to be trimmed so as to ensure the level of the supporting device, pit digging work during the installation of the static sounding instrument in the traditional methane release method can be reduced, the input cost of manpower and material resources can be reduced, and the installation of the main pipe and the auxiliary pipe can be simpler and more convenient according to the installation method provided by the invention, so that the integral structure is more stable.
The invention aims to provide a technical scheme of a tidal basin methane release method aiming at the defects in the prior art, mainly aims at carrying out micro-disturbance high-pressure methane release on a soft soil layer, can provide a device improved static penetrometer which is convenient to install and fast to carry, is matched with a flow control adjusting device for use, can quickly, accurately and economically release methane on a determined discharge point, can release methane on a deep soil layer, can save a large amount of labor cost, reduces the methane content in the ground layer to a safe range, can thoroughly solve the risks of explosion and poisoning during shield tunnel construction, can avoid the influence of deflation on surrounding structures, and reduce the influence of methane release on soil body disturbance, and can collect and intensively process the methane released by the soil layer by adopting the release method provided by the invention, thoroughly eradicates the adverse effect caused by harmful gas.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the assembly of a pre-venting pressurization device and a venting device according to the present invention;
FIG. 2 is a schematic view of the supporting device of the present invention;
FIG. 3 is a schematic diagram showing the connection of the cylinder with the main pipe and the auxiliary pipe when the static pressure exhaust pipe reaches a preset depth in the present invention.
In the figure: 1-a support device; 2-pipe-attached supporting seat; 3-an I-shaped fixing frame; 4-main pipe supporting seat; 5-perforating with a pipe; 6-a level meter; 7-lifting support legs; 8-pins; 9-pin holes; a 10-U-shaped adjusting rod; 11-a fixed seat; 12-a main tube; 13-attaching a pipe; 14-a cylinder assembly; 15-bearing plate; 16-penetrating a groove; 17-mounting a post; 18-a support plate; 19-an elongated plate; 20-adjusting the screw; 21-a first nut; 22-a second nut; 23-a connector; 24-a pressurized pipe valve; 25-exhaust valve; 26-a pressurized tube; 27-an exhaust pipe; 28-a tube-attached cylinder; 29-master cylinder; and (30) fixing the plate.
Detailed Description
As shown in fig. 1 to 3, in order to solve the above technical problem, the present invention adopts the following technical solutions:
a tidal basin biogas release method comprises the following steps:
1) measuring and lofting:
firstly, determining the spacing and the plane position of the vent holes according to a survey report; according to an investigation report of the early stage of the project, the plane position of the discharge hole is determined in advance, and construction basis is provided for methane discharge;
2) installing an air discharging device:
a. on-site installation of the support device 1
Firstly, two ends of an I-shaped fixing frame 3 are respectively sleeved on an auxiliary pipe supporting seat 2 and a main pipe supporting seat 4, so that a mounting hole of the I-shaped fixing frame 3 corresponds to a mounting hole on the auxiliary pipe supporting seat 2 and a mounting hole on the main pipe supporting seat 4 respectively, and two sides of the I-shaped fixing frame 3 are fixedly connected with the auxiliary pipe supporting seat 2 and the main pipe supporting seat 4 respectively by using a stud and a nut and are screwed tightly, so that the auxiliary pipe supporting seat 2 and the main pipe supporting seat 4 jointly form a supporting device 1; the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 can be installed together through the I-shaped fixing frame 3, the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 can be fixedly connected, the distance between the main pipe 12 and the auxiliary pipe 13 can be strictly ensured, the step of measuring the distance between the main pipe and the auxiliary pipe on site is omitted, and the supporting device 1 only needs to be assembled once in one project and can be used for methane release of exhaust holes at other positions;
b. fixed adjustment of the support device 1
Then the supporting device 1 is placed on the ground of a construction site, an auxiliary pipe through hole 5 in an auxiliary pipe supporting seat 2 is positioned right above a discharge hole, the heights of lifting support legs 7 below the auxiliary pipe supporting seat 2 and a main pipe supporting seat 4 are respectively adjusted according to the display of a level gauge 6 on an I-shaped fixing frame 3, the upper planes of the auxiliary pipe supporting seat 2 and the main pipe supporting seat 4 are kept horizontal, then a hammer is used for knocking a pin 8 from the top, and the bottom of the pin 8 sequentially penetrates through pin holes 9 of the auxiliary pipe supporting seat 2 and the main pipe supporting seat 4 and sinks into a soil layer for at least 10 cm; the height of the lifting support leg 7 of the supporting device 1 can be adjusted in time through the indication of the level gauge 6, so that the upper planes of the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 are kept horizontal, the pressurizing device and the exhaust device can be correspondingly installed, the structure of the lifting support leg 7 can be fixed by knocking the pin 8 into the soil layer from the top, the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 are fixedly connected with the ground, the supporting device 1 can be directly installed on the surface of the soil layer, the surface level of the supporting device 1 can be ensured by adjusting the shape of the supporting device 1 to be suitable for the ground, the fixing of the supporting device 1 and the ground can be ensured, the surface of the soil layer is not required to be trimmed to ensure the level of the supporting device 1, the pit digging work when the static sounding instrument is installed in the traditional methane releasing method can be reduced, and the investment cost of manpower and material resources, according to the installation method provided by the invention, the main pipe 12 and the auxiliary pipe 13 can be more conveniently installed, and the whole structure is more stable;
c. mounting of pressure devices
The four groups of fixing seats 11 are oppositely clamped on two sides of a main pipe supporting seat 4 and an auxiliary pipe supporting seat 2 in sequence in pairs, the bottom end face of a U-shaped adjusting rod 10 is placed on the top of a supporting device 1, the horizontal end faces of the fixing seats 11 are tightly attached to the bottom of the supporting device 1, the fixing seats 11 are installed in reserved installation holes in the side faces of the supporting device 1 at corresponding positions by adopting studs, the fixing seats 11 are fixedly connected with the supporting device 1, the positions of the fixing seats on the supporting device are adjusted, bearing plates 15 on the two groups of oppositely-arranged fixing seats 11 are aligned, connecting parts of the two groups of oppositely-arranged fixing seats 11 are fixed by a fixing plate 30 to form through grooves 16, and the two groups of oppositely-arranged fixing seats 11 are connected and; the fixing seats 11 and the U-shaped adjusting rods 10 are fixedly welded, the bottom end faces of the U-shaped adjusting rods 10 are placed on the supporting device 1, and the two groups of bearing plates 15 of the fixing seats 11 are aligned through adjustment, so that the bearing plates 15 can be aligned and fixedly connected, and the connection parts of the through grooves 16 are smooth;
d. mounting of exhaust devices
Firstly, the main pipe 12 and the auxiliary pipe 13 are fixedly connected with a piston rod of a cylinder assembly 14 in a threaded connection mode respectively, then the cylinder assembly 14 is placed on a fixed seat 11, an adjusting screw 20 penetrates through a mounting column 17, an extension plate 19 is placed on a supporting plate 18 on the fixed seat 11, two side surfaces of the extension plate 19 are ensured to be aligned with two side surfaces of the supporting plate 18, then the mounting height of the cylinder assembly 14 is determined according to survey data, the mounting position of the cylinder assembly 14 is determined by the position of a first nut 21 on the adjusting screw 20, a second nut 22 is screwed, the mounting column 17 and the adjusting screw 20 are fixed from the upper side, and finally the extension plate 19 and the supporting plate 18 are fixed by a connecting piece 23; when the air cylinder assembly 14 is installed, the adjusting screw 20 penetrates through the installation column 17, the adjusting screw 20 plays a certain limiting role on the installation column 17, the extension plate 19 in the air cylinder assembly 14 is placed on the support plate 18 on the fixing seat 11, and two side faces of the extension plate 19 are aligned with two side faces of the support plate 18, so that the air cylinder installation plate can be located right above the through groove 16, the follow-up main pipe 12 and the auxiliary pipe 13 can smoothly pass through the fixing plate 30 and are pressed into a soil layer by static pressure, the original position of the air cylinder assembly 14 is adjusted through analysis of survey data, the position of the installation column 17 can be limited through adjustment of the position of the first nut 21, and the installation column 17 is limited above the first nut 21.
3) Discharging biogas:
a. static pressure main pipe 12 and auxiliary pipe 13 to a predetermined depth
Firstly, ensuring that a pressurizing pipe valve 24 and an exhaust pipe valve 25 above the main pipe 12 and the auxiliary pipe 13 are kept closed, then driving an auxiliary pipe cylinder 28, carrying out static pressure on the auxiliary pipe 13 from a preset exhaust hole to a soil layer until the auxiliary pipe reaches a preset depth under the thrust action of the auxiliary pipe cylinder 28, and then starting a main pipe cylinder 29 to ensure that the main pipe 12 is subjected to static pressure to the same depth as the auxiliary pipe 13 under the thrust action of the main pipe cylinder 29; starting the cylinder assembly 14, wherein a piston rod of the cylinder assembly 14 is directly connected with the tops of the main pipe 12 and the auxiliary pipe 13, the descending height of the main pipe 12 and the auxiliary pipe 13 can be accurately controlled through the control of the cylinder assembly 14, the main pipe 12 and the auxiliary pipe 13 are vertically pressed into a preset depth of a soil layer through the pressure action of the cylinder assembly 14 on the main pipe 12 and the auxiliary pipe 13, the driving force and the speed of the main pipe 12 and the auxiliary pipe 13 can be ensured to be constant by adopting the cylinder assembly 14, and the static pressure action can be better controlled;
b. pressure in the tube
Then connecting the pressurizing pipe 26 of the accessory pipe 13 with an inflating pump, opening the pressurizing pipe valve 24 of the accessory pipe 13, simultaneously opening the exhaust pipe valve 25 of the main pipe 12, stopping the operation of the inflating pump when detecting that the gas flow rate at the exhaust pipe valve 25 of the main pipe 12 exceeds the output flow rate of the inflating pump, closing the pressurizing pipe valve 24 of the accessory pipe 13 and the exhaust pipe valve 25 of the main pipe 12, then pressing the main pipe 12 downwards by using the main pipe cylinder 29, injecting air into the main pipe 12 from the pressurizing pipe 26 of the main pipe 12 by using an air compressor, then opening the exhaust pipe valve 25 of the accessory pipe 13, and recording the outlet flow in the exhaust pipe 27; the pressurizing pipe 26 of the auxiliary pipe 13 is connected with the inflating pump, the pressurizing pipe valve 24 is opened, so that the gas in the inflating pump can enter the auxiliary pipe 13, if the auxiliary pipe 13 is blocked, the air pressure in the auxiliary pipe 13 can be increased along with the continuous input of the inflating pump to the auxiliary pipe 13, the sludge and the like blocked in the auxiliary pipe 13 can fall off to play a role of washing the pipe, the exhaust pipe valve 25 of the main pipe 12 is opened, the dangerous conditions that the air pressure in the gas-containing layer is increased by the input of the gas of the inflating pump under the condition that the auxiliary pipe 13 is unblocked, the gas explosion and the like are caused can be prevented, therefore, the exhaust pipe valve 25 of the main pipe 12 is unblocked, the air pressure value in the gas-containing layer can be relatively stable, along with the input of the gas of the inflating pump, the harmful gas and the input air in the gas-containing layer can overflow through the exhaust pipe 27 of the main pipe 12, and when the flow rate of the gas measured at the exhaust, the harmful gas in the gas-containing layer and the air input by the inflating pump can enter the exhaust pipe 27 of the main pipe 12, so that the main pipe 12 and the auxiliary pipe 13 can be in a unblocked state, then the exhaust pipe valve 25 of the main pipe 12 and the pressure pipe valve 24 of the auxiliary pipe 13 are closed, the inflating pump stops working, the pipe washing work of the auxiliary pipe 13 is completed, the main pipe 12 is moved downwards for a certain distance by using the air cylinder assembly 14 on the premise that the main pipe 12 and the auxiliary pipe 13 are both unblocked, so that a height difference is formed between the main pipe 12 and the auxiliary pipe 13, the gas introduced into the gas-containing layer through the main pipe 12 is converged at the bottom outlet of the main pipe 12, namely, a certain distance is kept below the outlet of the auxiliary pipe 13, the gas in the gas-containing layer can be preferentially discharged through the auxiliary pipe 13, the gas fluidity during the methane discharge is increased, and the methane release work is smoother and more efficient, air is pressed into the main pipe 12 by an air compressor, so that the gas pressure in the gas-containing layer is increased, and the discharge rate of the biogas from the auxiliary pipe 13 is increased;
c. collection of harmful gases
Collecting harmful gas discharged from the exhaust pipe 27 of the accessory pipe 13 and the exhaust pipe 27 of the main pipe 12 into a conveying pipeline, and discharging the harmful gas into a collecting bag through the conveying pipeline; most of biogas is discharged outside through the auxiliary pipe 13 and the exhaust pipe 27 of the auxiliary pipe 13, when the auxiliary pipe 13 is washed before biogas is released, a small part of harmful gases such as biogas can enter the main pipe 12 and the exhaust pipe 27 of the main pipe 12, all the discharged harmful gases can be collected into a collection bag through a conveying pipeline, the collection bag is a bidirectional gas valve gas collection device, the gas of the collection bag can be prevented from flowing back into the conveying pipeline, meanwhile, the collection bag is adopted to collect biogas, the harmful gases such as biogas can be completely collected without polluting air, meanwhile, the collection bag is light in weight, a large amount of gas can be stored and carried, and the harmful gases are transported out and then are uniformly treated;
4) dismantling the device and recovering the device on site:
respectively lifting the main pipe 12 and the accessory pipe 13 out of the soil by using a main pipe cylinder 29 and an accessory pipe cylinder 28 until the initial state is recovered, then respectively connecting a pressurizing pipe 26 of the main pipe 12 and a pressurizing pipe 26 of the accessory pipe 13 with an inflating pump, carrying out high-pressure washing on the main pipe 12 and the accessory pipe 13 by using the inflating pump, opening a pressurizing pipe valve 24, adjusting the inflating pump to ensure that the output flow rate of the inflating pump is kept above 50L/min and lasts for at least 20s, then detaching the connecting part between the supporting device 1 and the pressurizing device, separately transporting the connecting part to the next discharge hole for installation, simultaneously carrying out surface filling on the discharge hole by using on-site original soil, ensuring that the thickness of a filling layer is at least 10cm, and compacting the surface; utilize the inflating pump to be responsible for 12 and the accessory pipe 13 and carry out high pressure washing pipe respectively, be responsible for 12 and the accessory pipe 13 after using and carry out cleaning work, wash the in-process pressurized tube valve 24 of pipe and open, make high-pressure gas can get into and be responsible for 12 and the accessory pipe 13 inside through the pressurized tube 26, high-pressure gas is when being responsible for 12 and the accessory pipe 13 inner wall, can wash away the soil residue of adhesion on the inner wall, and take out from the bottom export of being responsible for 12 and accessory pipe 13, the velocity of flow control through the inflating pump lets in gaseous effect dynamics size, at least duration can guarantee that the time of ventilating is enough to accomplish washing pipe work, carry out the work of filling soil to the discharge hole after the release, can guarantee the structural stability of soil layer, greatly reduced is to the structural damage of surrounding soil layer. The output flow rate of the inflating pump is 5L/min; the flow rate of the inflating pump is controlled to be 5L/min, so that the blockage situation inside the auxiliary pipe 13 can be cleared by input air, and the dangerous situations that the flow rate is too high, the time is difficult to control when the air is input, the volume of the input air is too large, the gas pressure in a gas-containing layer is increased rapidly, explosion is induced and the like can be prevented; in the exhaust process, if the flow velocity of the exhaust pipe 27 of the accessory pipe 13 is reduced, an air compressor is adopted to continuously inject air with the pressure of 0.7Mpa into the pressurizing pipe 26 of the main pipe 12, if the exhaust pipe 27 of the accessory pipe 13 has methane sprayed out, the operation is continued, if no methane is discharged, the operation is kept still for 3-5min, and the discharge operation is finished; in the exhaust process, the flow velocity flowing out of the exhaust pipe 27 of the accessory pipe 13 is reduced, which can indicate that the exhausted biogas is reduced, the exhaust gas is reduced, which indicates that the accessory pipe 13 is blocked or the biogas residue in the gas-containing layer is reduced, and when the biogas in the gas-containing layer is exhausted, the standing time is 3-5min, which can reserve sufficient time for the exhaust work. The tube bottom of the main tube 12 is 100-500mm below the tube bottom of the auxiliary tube 13; the proper distance makes the tube bottom of the main tube 12 still located in the gas-containing layer, and can ensure that the air entering the gas-containing layer through the main tube 12 preferentially enters the bottom of the gas-containing layer, so that the original harmful gas such as methane and the like in the gas-containing layer is pressed into the auxiliary tube 13 and is discharged through the exhaust tube 27, and the methane is released.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
in the invention, the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 can be installed together through the I-shaped fixing frame 3, the fixed connection of the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 can be realized, the space between the main pipe 12 and the auxiliary pipe 13 can be strictly ensured, the step of measuring the distance between the two on site is omitted, the supporting device 1 only needs to be assembled once in one project, the supporting device can be used for methane release of exhaust holes at other positions, the height of the lifting support leg 7 of the supporting device 1 can be timely adjusted through the indication of the level gauge 6, the upper planes of the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 are kept horizontal, so that the corresponding installation of a pressurizing device and an exhaust device is ensured, the structure of the lifting support leg 7 can be fixed through knocking the pin 8 into the soil layer from the top, and the main pipe supporting seat 4 and the auxiliary pipe supporting seat 2 are, the supporting device 1 can be directly installed on the surface of a soil layer, the surface level of the supporting device 1 can be guaranteed by adjusting the shape of the supporting device 1 to be adaptive to the ground, the supporting device 1 can be fixed with the ground, the surface of the soil layer does not need to be trimmed to guarantee the level of the supporting device 1, pit digging work during installation of a static sounding instrument in the traditional methane release method can be reduced, the input cost of manpower and material resources can be reduced, and according to the installation method provided by the invention, the main pipe 12 and the auxiliary pipe 13 can be installed more conveniently, so that the integral structure is more stable.
The invention aims to provide a technical scheme of a tidal basin methane release method aiming at the defects in the prior art, mainly aims at carrying out micro-disturbance high-pressure methane release on a soft soil layer, can provide a device improved static penetrometer which is convenient to install and fast to carry, is matched with a flow control adjusting device for use, can quickly, accurately and economically release methane on a determined discharge point, can release methane on a deep soil layer, can save a large amount of labor cost, reduces the methane content in the ground layer to a safe range, can thoroughly solve the risks of explosion and poisoning during shield tunnel construction, can avoid the influence of deflation on surrounding structures, and reduce the influence of methane release on soil body disturbance, and can collect and intensively process the methane released by the soil layer by adopting the release method provided by the invention, thoroughly eradicates the adverse effect caused by harmful gas.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple variations, equivalent substitutions or modifications based on the present invention to achieve substantially the same technical effects are within the scope of the present invention.
Claims (4)
1. A tidal basin biogas release method is characterized in that: the method comprises the following steps:
1) measuring and lofting:
firstly, determining the spacing and the plane position of the vent holes according to a survey report;
2) installing an air discharging device:
a. in situ installation of support devices
Firstly, respectively sleeving two ends of an I-shaped fixing frame on an auxiliary pipe supporting seat and a main pipe supporting seat, enabling mounting holes of the I-shaped fixing frame to respectively correspond to the mounting holes on the auxiliary pipe supporting seat and the main pipe supporting seat, and fixedly connecting and screwing two sides of the I-shaped fixing frame with the auxiliary pipe supporting seat and the main pipe supporting seat by using a stud and a nut, so that the auxiliary pipe supporting seat and the main pipe supporting seat form a supporting device together;
b. fixed adjustment of support device
Then, the supporting device is placed on the ground of a construction site, an auxiliary pipe through hole in the auxiliary pipe supporting seat is positioned right above the discharge hole, the heights of lifting support legs below the auxiliary pipe supporting seat and the main pipe supporting seat are respectively adjusted according to the display of a level gauge on the I-shaped fixing frame, the upper planes of the auxiliary pipe supporting seat and the main pipe supporting seat are kept horizontal, then the pin is knocked by a hammer from the top, and the bottom of the pin sequentially penetrates through pin holes of the auxiliary pipe supporting seat and the main pipe supporting seat and is sunk into a soil layer by at least 10 cm;
c. mounting of pressure devices
The method comprises the following steps that four groups of fixing seats are oppositely clamped on two sides of a main pipe supporting seat and an auxiliary pipe supporting seat in sequence in pairs, the bottom end face of a U-shaped adjusting rod is placed on the top of a supporting device, the horizontal end faces of the fixing seats are tightly attached to the bottom of the supporting device, the fixing seats are installed in reserved installation holes in the side faces of the supporting device at corresponding positions by adopting studs, the fixing seats are fixedly connected with the supporting device, the positions of the fixing seats on the supporting device are adjusted, bearing plates on the two groups of fixing seats which are oppositely arranged are aligned, connecting parts of the two groups of fixing seats which are oppositely arranged are fixed by using fixing plates to form through grooves, and the two groups of fixing;
d. mounting of exhaust devices
The method comprises the following steps of firstly, fixedly connecting a main pipe and an auxiliary pipe with a piston rod of an air cylinder assembly in a threaded connection mode respectively, then placing the air cylinder assembly on a fixed seat, enabling an adjusting screw to penetrate through an installation column, enabling an extension plate to be placed on a supporting plate on the fixed seat, ensuring that two side faces of the extension plate are aligned with two side faces of the supporting plate, then determining the installation height of the air cylinder assembly according to survey data, determining the installation position of the air cylinder assembly according to the position of a first nut on the adjusting screw, screwing a second nut, fixing the installation column and the adjusting screw from the upper side, and finally fixing the extension plate and the supporting plate by using a connecting piece;
3) discharging biogas:
a. static pressure discharge pipe to a predetermined depth
Firstly, ensuring that a pressurizing pipe valve and an exhaust pipe valve above a main pipe and an auxiliary pipe are kept closed, then driving an auxiliary pipe cylinder, carrying out static pressure on the auxiliary pipe from a preset exhaust hole to a soil layer until the auxiliary pipe reaches a preset depth under the thrust action of the auxiliary pipe cylinder, and then starting the main pipe cylinder to ensure that the main pipe is subjected to static pressure to the same depth as the auxiliary pipe under the thrust action of the main pipe cylinder;
b. pressure in the tube
Connecting the pressure pipe of the auxiliary pipe with an inflating pump, opening a pressure pipe valve of the auxiliary pipe, simultaneously opening an exhaust pipe valve of the main pipe, stopping the operation of the inflating pump when detecting that the gas flow rate at the exhaust pipe valve of the main pipe exceeds the output flow rate of the inflating pump, closing both the pressure pipe valve of the auxiliary pipe and the exhaust pipe valve of the main pipe, then pressing the main pipe downwards by using a main pipe cylinder, injecting air into the main pipe from the pressure pipe of the main pipe by using an air compressor, then opening the exhaust pipe valve of the auxiliary pipe, and recording the air outlet flow in the exhaust pipe;
c. collection of harmful gases
Collecting harmful gas discharged from the exhaust pipes of the auxiliary pipe and the main pipe into a conveying pipeline, and discharging the harmful gas into a collecting bag through the conveying pipeline;
4) dismantling the device and recovering the device on site:
the main pipe and the auxiliary pipe are respectively lifted out of the soil by using the main pipe cylinder and the auxiliary pipe cylinder until the initial state is recovered, then the main pipe pressurization pipe and the auxiliary pipe pressurization pipe are respectively connected with an inflating pump, the main pipe and the auxiliary pipe are subjected to high-pressure pipe washing by using the inflating pump, a valve of the pressurization pipe is opened, the inflating pump is adjusted to ensure that the output flow rate of the inflating pump is kept more than 50L/min and lasts for at least 20s, then the connecting part between the supporting device and the pressurizing device is dismantled and is separately transported to the next discharge hole for installation, meanwhile, the surface of the discharge hole is filled with the in-situ original soil, the thickness of a soil filling layer is ensured to be at least 10cm, and the surface is compacted.
2. The tidal basin biogas release method according to claim 1, wherein: in the step 3) b, the output flow rate of the inflating pump is 5L/min.
3. The tidal basin biogas release method according to claim 1, wherein: in the step 3) b, the tube bottom of the main tube is 100 mm and 500mm below the tube bottom of the auxiliary tube.
4. The tidal basin biogas release method according to claim 1, wherein: in the step 3) c, in the exhaust process, if the flow velocity of the attached pipe exhaust pipe is reduced, an air compressor is adopted to continuously inject air with the pressure of 0.7Mpa into the main pipe pressurization pipe, if the attached pipe exhaust pipe has methane sprayed out, the operation is continued, if no methane is discharged, the operation is kept still for 3-5min, and the discharge operation is finished.
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