CN110469358B - Method for modifying main return air duct suitable for underground centralized return air - Google Patents
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Abstract
The invention discloses a method for reconstructing a main return air duct suitable for underground concentrated return air, which comprises the following steps of S1, designing an underground main return air duct reconstruction scheme; s2, tunneling a return air slope way communicated with the middle-section return air stone door at the shallowest part; s3, tunneling a new return air horsehead door is communicated with the lower arc section and the return air shaft; s4, a return air stone door between the upper opening of the expanded brush return air slope way and the middle section return air horse head door at the shallowest part; s5, arranging a platform for closing a shaft of the return air shaft; s6, tunneling a main fan chamber; s7, arranging a main fan in the main fan chamber; and S8, arranging a spraying device in a main air return duct at the outlet of the underground centralized main fan to wash and purify the polluted air. The invention can effectively solve the problem of mutual interference generated by the parallel connection of the underground multi-middle-section return air stone door fans in the condition of lacking the centralized return air fan station; the problem that the main fan cannot be installed at the wellhead of the return air shaft due to land acquisition, environmental protection or geographical reasons can be solved; the influence on the existing ventilation system is small; is environment-friendly.
Description
Technical Field
The invention belongs to the technical field of ventilation of underground metal mines and nonmetal mines, and particularly relates to a method for modifying a main return air duct suitable for underground concentrated return air.
Background
Along with the gradual change of the metal and nonmetal ores from the shallow part to the deep part for mining, part of old mines cannot be provided with a main fan at the mouth of the air return shaft due to land acquisition, environmental protection or geographical reasons, the original ventilation system adopts an underground multi-fan multi-stage machine station for ventilation, a total air return stone door is not arranged, a fan is only arranged at each underground middle-section air return stone door on the air return side of the system, and dirty air is discharged to the air return shaft and returns to the ground surface. However, a plurality of new middle sections are gradually put into production along with the deep part of the mine, and meanwhile, the original old middle sections of the shallow part are delayed to be closed, so that the quantity of the air return stone door fans of the middle sections of the whole system is increased, and interference is generated among the air return stone door fans. The air flow in the middle section of the mine is reversed, the underground air flow flows out of order, the total air quantity is reduced, the fan runs in low efficiency or stalled mode, the ventilation condition of a stope is poor, the working environment of workers is severe, and the ventilation safety problem is obvious. For thoroughly solving this kind of mine ventilation problem, need reform transform in the pit shallowest portion return air middle section return air stone door and return air shaft, set up the main return air duct of concentrated return air, install main fan in main return air duct, concentrate alone and take out or establish ties with original each middle section return air stone door fan and form return air side two-stage machine station, just can guarantee that the system needs the amount of wind and return air side air current orderly flow.
Chinese patent No. CN109595025A discloses a return air structure for metal underground mine. This structure is through establishing a return air middle section between every two-layer ore removal level that hangs down deeply adjacent, adopts the mining area return air courtyard, leads the adjacent upper portion in each return air middle section and the horizontal foul wind of lower part ore removal to this return air level and forms the return air route for reduce return air middle section quantity in the pit, reduce mine construction investment and manufacturing cost. However, the structure does not have a total return air duct for underground concentrated return air, only a main fan can be installed at the wellhead of the return air shaft or fans can be installed at the middle sections of the underground return air, and the structure is not suitable for the modification of a mine ventilation system, wherein the wellhead of the return air shaft cannot be provided with the fans or the fans of the stone return air door at the middle sections of the underground return air cannot interfere with each other, and the mine ventilation system does not have the total return air duct for underground concentrated.
Disclosure of Invention
The invention aims to provide a method for reforming a main return air duct suitable for underground concentrated return air, which can meet the requirement that a main fan cannot be installed at the underground concentrated return air duct under the conditions that the fan cannot be installed at the wellhead of a return air shaft and the underground concentrated total return air duct is lacked.
The invention provides a method for reconstructing a main return air duct suitable for underground concentrated return air, wherein the main return air duct of an original ventilation system comprises a shallowest part middle section return air stone door, a deep part middle section return air stone door, a shallowest part middle section return air stone door machine station fan, a deep part return air stone door machine station fan, a return air shaft and a shallowest part middle section return air horse head door, and the method comprises the following steps:
s1, designing scheme for improving underground main return air duct
Designing an air return slope way and a fresh air return horsehead door which are connected with an air return stone door at the middle section of the shallowest part and an air return shaft, wherein the air return slope way comprises an upper arc section, a straight section and a lower arc section which are sequentially communicated from top to bottom, and an upper opening of the air return slope way is arranged on the upper arc section;
designing an expanding brush section for connecting an upper opening of the return air slope way and a return air horse head door at the middle section of the shallowest part;
designing a platform for sealing a shaft of the return air shaft;
designing a main fan chamber according to the model of the underground main fan required to be installed in the system after modification;
a spraying device is arranged at the outlet of the main fan;
s2, tunneling a return air slope way communicated with the middle-section return air stone door at the shallowest part
From the shallowest middle section air return stone door, according to the design of S1, tunneling an upper arc section-straight line section-lower arc section of the air return slope downwards in sequence;
s3, the tunneling new and return air horsehead door is communicated with the lower arc section and the return air shaft
Tunneling a new return air horsehead door to be communicated with a return air shaft from the lower arc section according to the design of S1;
s4, a return air stone door between the upper opening of the expanded brush return air slope way and the middle section return air horse head door of the shallowest part
Removing a fan of the middle-section air return stone door machine station at the shallowest part, and expanding and brushing the middle-section air return stone door at the shallowest part from the upper opening of an air return slope to the middle-section air return horse head door at the shallowest part according to the design of S1; after the expansion brushing is finished, the expansion brushing section, the new return air ingate and the return air slope way form a spiral total return air duct;
s5 platform for closing shaft of return air shaft
According to the design of S1, two platforms are arranged in the return air shaft between the return air shaft ingate and the fresh return air ingate at the middle section of the shallowest part;
s6 tunneling main fan chamber
According to the design of S1, tunneling a main fan chamber in the expanding brush section;
s7, installing a main fan
According to the working condition of a ventilation system, a main fan is arranged in the main fan chamber, and air is returned in a centralized manner; a remote automatic air adjusting door is arranged in each middle section air return stone door, and the air return amount of each middle section is adjusted according to the requirement, namely, a main air return channel of the original system is transformed into a main air return channel for underground concentrated air return, so that a ventilation system for underground concentrated air return is formed;
s8, installing a spraying device to wash and purify the dirty air
According to the design of S1, a spraying device is arranged in a main air return duct at the outlet of the main fan, and the dirty air discharged to the ground surface through the main air return duct is washed and purified.
The cross sections of the return air slope way, the new return air horsehead door and the expanding brush section are the same as the cross section of the return air shaft, and the cross sections are three-center arches or arc arches.
The gradient of the return air slope way is less than or equal to 15 percent.
The new return air ingate is located 10-20 m below the bottom plate of the middle section return air ingate of the shallowest part, the new return air ingate and the opening direction of the middle section return air ingate of the shallowest part form an included angle of 30-90 degrees, and the length of the new return air ingate is 3-10 m.
The platform is respectively positioned at the elevation of the bottom plate of the middle-section return air ingate at the shallowest part and above the elevation of the top plate of the fresh return air ingate, and the platform comprises a main beam and a secondary beam which are arranged on the cross section of a shaft of the return air shaft in a criss-cross manner.
The platform adopts the steel structure formula, and the girder passes through threaded fastener and angle steel with the secondary beam and connects formation net, and the net upper berth is equipped with the bed plate, and the rigid coupling has the stiffening rib that the interval is not more than 0.8m on the bed plate.
The main beams and the secondary beams are coated with hot dip zinc with the thickness of not less than 120 mu m.
A ladder room is arranged in a shaft of the return air shaft, a thick-pattern steel plate is paved above a platform plate of the original ladder room to seal the ladder room, and a cover plate is adopted to seal the ladder opening.
The platform adopts a reinforced concrete beam plate structure, the existing well wall of the main beam chiseling return air shaft forms a beam pit, the main beam and the secondary beam are arranged in a shape like a Chinese character jing, concrete is poured around the main beam and the secondary beam to form a reinforced concrete slab, a hoisting access hole is reserved on the reinforced concrete slab between the main beam and the secondary beam, concrete is poured between the existing well wall chiseling part of the return air shaft and the reinforced concrete slab to form a whole, and a movable reinforced concrete cover plate is arranged above the hoisting access hole for sealing.
The spraying device adopts a water spraying or mist spraying mode.
Compared with the prior art, the invention has the following advantages:
1. a spiral total return air duct is formed by tunneling a new return air ingate, a return air slope and an expanding brush section, and a platform is arranged at the corresponding position of a return air shaft to block a parallel return air structure of a middle-section return air stone door at the shallowest part and other middle-section return air stone doors, so that dirty air can be discharged to the return air shaft through the total return air duct and returned to the ground surface, and the problem of mutual interference caused by the parallel connection of a plurality of middle-section return air stone door fans under the condition of lacking of a centralized return air fan station is effectively solved; the inverted air shaft is not required to be constructed, the problem that the inverted air shaft cannot be constructed under adverse geological conditions is solved, the engineering quantity is saved, and the transformation period is short;
2. the main fan chamber is tunneled in the expanding brush section, so that the main fan is arranged underground to intensively return air, the engineering and equipment investment is saved, land acquisition is not needed, the ventilation management is convenient, the influence of fan noise on a wellhead operator is avoided, and the problem that the main fan cannot be installed at the wellhead of the return air shaft due to land acquisition, environmental protection or geographical reasons can be solved;
3. during the transformation, only the fan of the return air stone door machine station at the middle section of the shallowest part is dismantled, so that the influence on the existing ventilation system is small;
4. a spraying device is arranged in a main air return duct at the outlet of the underground centralized main fan to wash and purify polluted air and remove dust and SO possibly contained in the polluted air2、NO2、H2S, the purified wind flow discharged to the ground surface is environment-friendly and pollution-free.
Drawings
FIG. 1 is a schematic structural view of an original ventilation system before modification.
Fig. 2 is a top view of a middle-section air return structure of the shallowest part of an original ventilation system before modification.
FIG. 3 is a diagram illustrating steps S1 to S4 according to the present invention.
FIG. 4 is a diagram illustrating the implementation of steps S5 to S8 according to the present invention.
Fig. 5 is an enlarged schematic top view of the total air return duct in fig. 4.
FIG. 6 is a sectional view of the steel-structured platform according to the present invention.
Fig. 7 is a sectional view taken along line i-i in fig. 6.
Fig. 8 is a cross-sectional view taken along line ii-ii of fig. 6.
Fig. 9 is a rough drawing of the connection node of the primary beam and the secondary beam in fig. 7.
Fig. 10 is a sectional view showing a reinforced concrete beam slab structural platform according to the present invention.
Fig. 11 is a sectional view taken along line iii-iii in fig. 10.
FIG. 12 is a cross-sectional view taken along line IV-IV of FIG. 10.
The labels shown in the figures and the corresponding component names are:
1. an air inlet well; 2. the middle section of the shallowest part enters the air way; 3. a deep middle section air inlet lane; 4. a deep middle section air return stone door; 5. a stone door is arranged at the middle section of the shallowest part; 6. a deep return air stone gantry crane station fan; 7. a fan of the stone door machine station is returned to the middle section of the shallowest part; 8. a return air shaft; 9. the middle section of the shallowest part is provided with an air return ingate; 10. an upper arc segment; 11. a straight line segment; 12. a lower arc segment; 13. an upper opening of the return air slope way; 14. a fresh return air ingate; 15. expanding a brushing section; 16. a main fan chamber; 17. a main fan; 18. a spraying device; 19. a platform; 20. a main beam; 21. a secondary beam; 22. the return air shaft is provided with a well wall; 23. paving a board; 24. angle steel; 25. a stiffening rib; 26. a reinforced concrete slab; 27. hoisting the manhole; 28. a movable reinforced concrete cover plate; 29. a beam nest; 30. a ladder compartment; 31. the air door is automatically adjusted in a remote mode.
Detailed Description
Example one
As can be seen from figures 1 and 2, the original ventilation system suitable for underground centralized return air of the invention comprises an air inlet shaft 1, a shallowest middle section air inlet shaft 2, a deep middle section air inlet shaft 3, a deep middle section air return stone door 4, a shallowest middle section air return stone door 5, a deep air return stone door machine station fan 6, a shallowest middle section air return stone door machine station fan 7 and a return air shaft 8, wherein the shallowest middle section air inlet shaft 2 is positioned at the shallowest part of a mine, the deep middle section air inlet shaft 3 is positioned below the shallowest middle section air inlet shaft 2, the air inlet ends of the shallowest middle section air inlet shaft 2 and the deep middle section air inlet shaft 3 are both communicated with the deep well 1, the air return end of the shallowest middle section air inlet shaft 2 is communicated with the return air shaft 8 through the shallowest middle section air return stone door 5, the air return end of the deep middle section air inlet shaft 3 is communicated with the return air shaft 8 through the deep air return stone door 4, the air return stone door machine station fan 6 is arranged in the deep return air inlet shaft 4, the fan 7 of the middle-section air return stone door machine station at the shallowest part is arranged in the middle-section air return stone door 5 at the shallowest part.
As can be seen from fig. 3 to 5, in the present invention, the main air return duct of the original ventilation system includes a deep middle section air return stone door 4, a shallowest middle section air return stone door 5, a deep air return stone door machine station fan 6, a shallowest middle section air return stone door machine station fan 7, an air return shaft 8 and a shallowest middle section air return horse head door 9, and the modification method includes the following steps:
s1, designing scheme for improving underground main return air duct
Designing an air return slope and a fresh air return horsehead door 14 for connecting the middle-section air return stone door 5 at the shallowest part with an air return shaft 8, wherein the air return slope comprises an upper arc section 10, a straight section 11 and a lower arc section 12 which are sequentially communicated from top to bottom, an upper opening 13 of the air return slope is arranged on the upper arc section 10, the opening coordinate and the azimuth angle of the upper opening 13 of the air return slope, the gradient and the section of the air return slope, the radius and the length of the two arc sections and the length of the straight section 11 are determined, and the opening coordinate, the azimuth angle, the length and the section of the fresh air return horsehead door 14 are determined;
designing an expanded brushing section 15 for connecting an upper opening 13 of the return air slope way and the middle return air horse head door 9 at the shallowest part, and determining the size of the section of the expanded brushing section 15;
designing a platform 19 for sealing a shaft of the return air shaft 8, and determining the sealing position and the structural type of the platform 19;
designing a main fan chamber 16 according to the model of an underground main fan 17 required by the transformed system, and determining the position of the main fan chamber 16;
designing a spraying device 18 at the outlet of a main fan 17, and determining the form, the installation position and the technical requirements of the spraying device 18;
s2, tunneling a return air slope way communicated with the middle-section return air stone door 5 at the shallowest part
From the middle section of the shallowest part in the return air stone door 5, according to the opening coordinate and azimuth of the upper opening 13 of the return air slope, the section and gradient of the return air slope, the radius and length of the two circular arc sections and the length of the straight section 11 which are designed and determined in S1, the upper circular arc section 10-the straight section 11-the lower circular arc section 12 of the return air slope is tunneled downwards in sequence;
s3, a tunneling new and return air horsehead door 14 is communicated with the lower arc section 12 and the return air shaft 8
From the lower arc section 12, according to the opening coordinate, azimuth angle, length and section of the new return air ingate 14 designed and determined in S1, the new return air ingate 14 is tunneled to be communicated with the return air shaft 8;
s4, a return air stone door between the upper opening 13 of the expanded brush return air slope way and the middle section return air horse head door 9 of the shallowest part
Removing the fan 7 of the middle-section air return stone door machine station at the shallowest part, and expanding and brushing the middle-section air return stone door 5 at the shallowest part in the direction of the middle-section air return horsehead door 9 from the upper opening 13 of the air return slope according to the section designed and determined in the S1; after the expansion brushing is finished, the expansion brushing section 15, the new return air horsehead door 14 and the return air slope way form a spiral total return air duct;
According to the closed position and the structural style of the platform 19 designed and determined in S1, two platforms 19 are arranged in the return air shaft 8 between the return air shaft ingate 9 and the new return air ingate 14 at the middle section of the shallowest part, and the two platforms 19 are respectively positioned at the elevation of the bottom plate of the return air ingate 9 at the middle section of the shallowest part and above the elevation of the top plate of the new return air ingate 14;
s6, tunneling main fan chamber 16
Tunneling the main fan chamber 16 in the expansion brushing section 15 according to the main fan chamber 16 and the position designed in the S1;
s7, installing the main fan 17
According to the working condition of a ventilation system, a main fan is arranged in the main fan chamber 16 to return air in a centralized manner; remote automatic air doors 31 are arranged at the joints of the deep middle section air return stone doors 4, the shallowest middle section air return stone door 5 and the shallowest middle section air inlet lane 2, and the air return amount of each middle section is adjusted according to needs, namely, a main air return passage of an original system is transformed into a main air return passage for underground concentrated air return, so that a ventilation system for underground concentrated air return is formed;
s8, installing a spraying device 18 to wash and purify the dirty air
According to the form, the installation position and the technical requirements of the spraying device 18 designed and determined in the S1, the spraying device 18 is arranged in the main air return duct at the outlet of the main fan 17, and the dirty air exhausted to the ground surface through the main air return duct is washed and purified.
In the invention, the cross sections of the return air slope way, the new return air horsehead door 14 and the expanding brush section 15 are the same as the cross section of the return air shaft 8, and the cross sections are all three-center arches or circular arcs.
In the invention, the spraying device adopts a water spraying or spraying mode, when the spraying mode is adopted, one of high-pressure spraying or ultrasonic dry fog spraying is selected, the high-pressure spraying can adopt a KSW-7500-A type high-pressure spraying dust removal system produced by Kemei environment limited of Huangshan city or an FGL-WH24L type high-pressure spraying dust removal system produced by Fei Ge Lang environmental protection technology limited of Guangzhou, and the ultrasonic dry fog spraying can adopt a PWZJ-02A type ultrasonic dry fog dust removal system produced by Kemei environment limited of Huangshan city or a GN-P2600 type ultrasonic dry fog dust removal system produced by Fei Lang environmental protection technology limited of Guangzhou.
In the invention, the remote automatic air door 31 can adopt an intelligent non-pressure light-operated automatic air door SZFM remote air door or a double-blade non-pressure balance air door light-operated intelligent remote air door produced by a Zaozhuang and Shundao electromechanical equipment company, and also can adopt a mining automatic control air door disclosed as an authorized bulletin number CN 207393242U.
As can be seen in fig. 5, the return air ramp of the present invention has a slope of 15% or less.
In the invention, the new air return ingate 14 is positioned 10-20 m below the bottom plate of the middle air return ingate 9 at the shallowest part, the new air return ingate 14 and the opening direction of the middle air return ingate 9 at the shallowest part form an included angle of 30-90 degrees, and the length of the new air return ingate 14 is 3-10 m.
As can be seen from fig. 6 to 9, the platform 19 of the present invention is of a steel structure, the platform 19 includes main beams 20 and secondary beams 21, the main beams 20 and the secondary beams 21 are arranged in a channel steel grid shape on the cross section of the shaft of the return air shaft 8, the main beams 20 are arranged longitudinally, the secondary beams 21 are arranged transversely, or the main beams 20 are arranged transversely and the secondary beams 21 are arranged longitudinally, the distance between adjacent main beams 20 is 0.4 to 1.5m, the distance between adjacent secondary beams 21 is 0.4 to 0.8m, and the distance between the main beams 20 and the secondary beams 21 is equal; angle steel 24 is arranged at the connecting point of the main beam 20 and the secondary beam 21, bolt holes are drilled, bolts penetrate through the bolt holes to fixedly connect the main beam 20 and the secondary beam 21 on the angle steel 24, and the main beam 20 and the secondary beam 21 are arranged on the angle steel 24 in a grid shape; after the main beam 20 and the secondary beam 21 are connected, paving plates 23 are laid above the grids, the paving plates 23 are made of pattern steel plates, stiffening ribs 25 are configured according to the structure, the stiffening ribs 25 are made of flat steel, and the distance between the stiffening ribs 25 is not more than 0.8 m; the welding seams of the floor plate 23, the main beam 20, the secondary beam 21 and the stiffening ribs 25 are welded by adopting discontinuous welding seams.
As can be seen from the figures 6 and 7, a ladder room 30 is arranged in the shaft of the return air shaft 8, the distance between steel beams at the ladder room 30 is adjusted according to the actual condition of the ladder room 30, the ladder room 30 is closed and paved above the platform plate of the original ladder room by adopting a thick-pattern steel plate, the ladder opening is closed by adopting a cover plate, and the cover plate and the fixing mode are adjusted by field manufacture.
In the invention, the main beam 20 and the secondary beam 21 are subjected to corrosion prevention by hot dip galvanizing, the thickness of a zinc layer is not less than 120 mu m, the paint is treated by chlorinated epoxy rubber paint for 2 times, the thickness of each time is not less than 80 mu m, all bolts are subjected to galvanizing treatment, and the bolt connection adopts a measure for preventing the nut from loosening.
Example two
As can be seen from fig. 10 to 12, the present embodiment is different from the first embodiment in that: the platform of the embodiment adopts a reinforced concrete beam slab structure, the concrete strength grade is not less than C30, the platform 19 comprises a main beam 20 and a secondary beam 21, the main beam 20 chisels off the existing well wall 22 of the return air shaft to form a beam nest 29, and the size of the beam nest 29 is determined on site according to the specification of the main beam 20;
the main beams 20 and the secondary beams 21 are arranged in a cross shape, the main beams 20 are transversely arranged, the secondary beams 21 are longitudinally arranged, or the main beams 20 are longitudinally arranged and the secondary beams 21 are transversely arranged, the distances between the main beams 20 or the secondary beams 21 are the same, and the distance range is 0.8-1.5 m; pouring concrete around the main beam 20 and the secondary beam 21 to form a reinforced concrete slab 26, wherein the reinforced concrete slab 26 can chiseled or not chiseled the existing shaft wall 22 of the return shaft within a certain height of the slab; a square hoisting access hole 27 is reserved on a reinforced concrete slab 26 between the main beam 20 and the secondary beam 21, and the length of the hole edge is equal to the distance between the main beam 20 and the secondary beam 21; concrete is poured between the chiseling part of the existing shaft wall 22 of the return air shaft and the reinforced concrete slab 26 to form a whole, and a movable reinforced concrete cover plate 28 is arranged above the hoisting access hole 27 for sealing.
Taking the transformation of the west wing main return air duct of a certain cuprite ventilation system in Hubei as an example:
the ventilation system of the original cuprite of Hubei is a central diagonal ventilation system with central air inlet and two return wings. The air is fed by adopting an auxiliary shaft (with the net diameter of 5m), and returned by adopting a 30-wire return shaft (with the net diameter of 4m) of the west wing and a 7-wire return shaft (with the net diameter of 3.5m) of the east wing. Because the two return air shaft well heads are the farmland in the lake region, the return air shaft well head farmland in the flood period is easy to submerge and difficult to land, and therefore the main fan cannot be installed on the return air shaft well head in the mine. The original system adopts a drawing-out type ventilation mode of a multi-fan multi-stage machine station, and a machine station fan is arranged at each return air stone door of the middle section in the well. And underground dirty air is discharged to the 30-line return air shaft and the 7-line return air shaft through the fans of the middle-section return air stone door machine station and then discharged out of the ground surface. Along with a plurality of middle sections of this mine deep drop into production, shallow portion middle section can't be closed, and total system production middle section reaches more than 10, and the middle section return air stone door machine station fan that communicates 30 lines and 7 lines return air shafts reaches 22. The fans of the underground station have serious mutual interference, and part of the fans operate in a reverse, inefficient or stalling way. The problems of insufficient total underground air quantity, poor ventilation condition of a stope and prominent ventilation safety are caused. Therefore, the mine adopts an underground centralized ventilation scheme to optimize and transform a ventilation system. As the mine does not have a total return air duct for underground concentrated return air, the west wing main return air duct and the east wing main return air duct of the original system need to be modified.
As shown in fig. 3 to 5 and 9 to 12, the specific modification steps are as follows:
s1, designing scheme for improving underground main return air duct
Designing an air return slope way and a fresh air return horse head door 14 which are connected with an air return stone door 5 at the middle section of-270 m of the shallowest part of the west wing and a return air shaft 8 at 30 lines, determining the opening coordinates (X is 3330811.226, Y is 38588124.108 and Z is-266.144) and the azimuth angle of 150 degrees 29 '40' of an upper opening 13 of the air return slope way, determining the gradient of the air return slope way to be 12 percent, the radiuses of two circular arc sections to be 10m, the length of an upper circular arc section 10 to be 13.8m, the length of a lower circular arc section 12 to be 12.3m, the length of a straight section 11 to be 48.5m and the section of the air return slope way to be2The coordinates (X3330795.165, Y38588056.883, Z-275.307) and the azimuth angle 148 ° 21' 9 ″, the length 3.8m and the section 13.15m of the fresh air return header 14 are determined2The new return air ingate 14 forms an included angle of 80 degrees with the opening direction of the middle return air ingate 9 at the shallowest part-270 m, and the new return air ingate 14 is positioned at a position which is about 10m below the bottom plate of the middle return air ingate 9 at the shallowest part-270 m (the bottom plate of the middle return air ingate 9 at the shallowest part-270 m is-265.705 m);
determining the section size of the expanded brush section 15 from the upper opening 13 of the return air slope way to the shallowest part-270 m of the middle section return air horse head door 9 to be 13.15m2；
Designing a platform 19 for sealing a shaft of the return air shaft 8, and determining the position (respectively positioned at elevations of-265.705 m and-270.353 m) and the structural type of the platform 19 to be a reinforced concrete beam slab structural formula;
designing a main fan chamber 16 according to the model of an underground main fan 17 required to be installed in the system after modification, and determining the position of the main fan chamber 16;
determining the form of a spraying device 18 at the outlet of a main fan 17 to spray water, wherein the installation position is located between the outer side of the air outlet of a main fan chamber 16 and the shallowest part-270 m middle section air return ingate 9, and the nozzles are arranged along the vault at the interval of 1 m;
the shapes of the sections of the return air slope way, the new return air horsehead door 14 and the expanding brush section 15 are three-heart arch sections;
s2, tunneling a return air slope way communicated with the middle-section return air stone door 5 at the shallowest part
From the shallowest part to the middle section of 270m in the air return stone door 5, according to the opening coordinate, azimuth angle, section and gradient of the upper opening 13 of the air return slope, tunneling the upper arc section 10-straight section 11-lower arc section 12 of the air return slope downwards in sequence;
s3, a tunneling new and return air horsehead door 14 is communicated with the lower arc section 12 and the return air shaft 8
From the lower arc section 12, according to the opening coordinates, azimuth angles, lengths and sections of the return air ingate 14 determined by design, the new return air ingate 14 is tunneled to be communicated with the return air shaft 8;
s4, a return air stone door between the upper opening 13 of the expanded brush return air slope way and the middle section return air horse head door 9 of the shallowest part
Removing a fan 7 of the shallowest part middle section air return stone door machine station, and expanding and brushing the shallowest part middle section air return stone door 5 from an upper opening 13 of an air return slope to the direction of a shallowest part middle section air return horsehead door 9 according to a designed and determined section; after the expansion brushing is finished, the expansion brushing section 15, a new return air horsehead door 14 and return air slope ways 10-12 form a spiral total return air duct;
s5, two platforms 19 for sealing the shaft of the return air shaft 8 are arranged between the middle return air horse head door 9 and the new return air horse head door 14 at the shallowest part in the return air shaft 8
According to the closed position and the structural type of the platform 19 designed and determined in S1, two platforms 19 of a reinforced concrete beam slab structure type are arranged in the return air shaft 8 between the return air shaft ingate 9 and the fresh return air ingate 14 at the middle section of the shallowest part;
for the reinforced concrete beam slab structural platform 19, the concrete strength grade is not less than C30; the reinforced concrete beams are arranged in a cross shape, the main beam 20 is transversely arranged, and the secondary beam 21 is longitudinally arranged; the main beams 20 or the secondary beams 21 have the same distance, and the distance is 1 m; the section of the main beam 20 is 0.2m wide and 0.35m high; the cross section of the secondary beam 21 is 0.2m wide and 0.25m high; the main beam 20 is provided with hooping ribs phi 8@150/300(2), the upper part is provided with a long rib 2 phi 10, and the lower part is provided with a long rib 2 phi 16; the secondary beam 21 stirrup phi 8@200(2), the upper part and the lower part are both provided with the through long rib of 2 phi 10;
the existing well wall 22 of the return air shaft of the main beam 20 needs to be chiseled to form a beam nest 29, and the size of the beam nest 29 is determined according to the specification of the main beam 20 on site;
the thickness of the reinforced concrete slab 26 is 0.15m, two-way through longitudinal bars in the slab are X & Y phi 8@150, and the existing shaft wall 22 of the internal air return shaft is chiseled at a certain height at the position of the reinforced concrete slab 26;
a square hoisting access hole 27 is reserved between the main beam 20 and the secondary beam 21, and the length of the hole edge is equal to 1 m;
pouring the existing shaft wall 22 chiseling part and the reinforced concrete slab 26 structure of the return air shaft to form a whole;
a movable reinforced concrete cover plate 28 is arranged above the lifting inspection hole 27 for sealing, and the movable reinforced concrete cover plate 28 is 1.2m long, 0.55m wide and 0.08m thick;
s6, tunneling a main fan chamber 16 in the expanding brush section 15
According to the designed main fan chamber 16 and the position, the main fan chamber 16 is tunneled in the expanding brush section 15;
s7, installing a main fan 17 in the main fan chamber 16
According to the working condition of a ventilation system, a main fan 17 is arranged in the main fan chamber 16 for centralized air return; remote automatic air doors 31 are arranged at the joints of the deep middle section air return stone doors 4, the shallowest middle section air return stone door 5 and the shallowest middle section air inlet lane 2, and the air return amount of each middle section is adjusted according to needs, namely, a main air return passage of an original system is transformed into a main air return passage for underground concentrated air return, so that a ventilation system for underground concentrated air return is formed;
s8, arranging a spraying device 18 in the total air return duct at the outlet of the underground centralized main fan 17 to wash and purify the dirty air
According to the design determined form, installation position and technical requirements of the spraying device 18, the spraying device 18 is arranged in the main air return duct at the outlet of the main fan 17, and dirty air exhausted to the ground surface through the main air return duct is washed and purified.
Claims (10)
1. The utility model provides a main return air duct transformation method suitable for in pit concentrate return air, original ventilation system main return air duct includes shallowest portion middle section return air stone door (5), deep middle section return air stone door (4), shallowest portion middle section return air stone door machine station fan (7), deep return air stone door machine station fan (6), return air shaft (8) and shallowest portion middle section return air horse head door (9), its characterized in that: the transformation method comprises the following steps:
s1, designing scheme for improving underground main return air duct
Designing a return air slope way and a new return air horse head door (14) which are connected with a return air stone door at the middle section of the shallowest part and a return air shaft, wherein the return air slope way comprises an upper arc section (10), a straight section (11) and a lower arc section (12) which are sequentially communicated from top to bottom, and an upper opening (13) of the return air slope way is arranged on the upper arc section;
designing an expanding brush section (15) for connecting an upper opening of the return air slope way and a return air horse head door at the middle section of the shallowest part;
designing a platform (19) enclosing the shaft of the return air shaft;
designing a main fan chamber (16) according to the model of the underground main fan (17) required by the transformed system;
a spraying device (18) is arranged at the outlet of the main fan;
s2, tunneling a return air slope way communicated with the middle-section return air stone door at the shallowest part
From the shallowest middle section air return stone door, according to the design of S1, tunneling an upper arc section-straight line section-lower arc section of the air return slope downwards in sequence;
s3, the tunneling new and return air horsehead door is communicated with the lower arc section and the return air shaft
Tunneling a new return air horsehead door to be communicated with a return air shaft from the lower arc section according to the design of S1;
s4, a return air stone door between the upper opening of the expanded brush return air slope way and the middle section return air horse head door of the shallowest part
Removing a fan of the middle-section air return stone door machine station at the shallowest part, and expanding and brushing the middle-section air return stone door at the shallowest part from the upper opening of an air return slope to the middle-section air return horse head door at the shallowest part according to the design of S1; after the expansion brushing is finished, the expansion brushing section, the new return air ingate and the return air slope way form a spiral total return air duct;
s5 platform for closing shaft of return air shaft
According to the design of S1, two platforms are arranged in the return air shaft between the return air shaft ingate and the fresh return air ingate at the middle section of the shallowest part;
s6 tunneling main fan chamber
According to the design of S1, tunneling a main fan chamber in the expanding brush section;
s7, installing a main fan
According to the working condition of a ventilation system, a main fan is arranged in the main fan chamber, and air is returned in a centralized manner; a remote automatic air adjusting door (31) is arranged in each middle section air return stone door, and the air return quantity of each middle section is adjusted according to the requirement, namely, a main air return channel of the original system is transformed into a main air return channel for underground concentrated air return, so that a ventilation system for underground concentrated air return is formed;
s8, installing a spraying device to wash and purify the dirty air
According to the design of S1, a spraying device is arranged in a main air return duct at the outlet of the main fan, and the dirty air discharged to the ground surface through the main air return duct is washed and purified.
2. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 1, characterized in that: the cross sections of the return air slope way, the new return air horsehead door and the expanding brush section are the same as the cross section of the return air shaft, and the cross sections are three-center arches or arc arches.
3. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 1, characterized in that: the gradient of the return air slope way is less than or equal to 15 percent.
4. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 1, characterized in that: the new return air ingate is located 10-20 m below the bottom plate of the middle section return air ingate of the shallowest part, the new return air ingate and the opening direction of the middle section return air ingate of the shallowest part form an included angle of 30-90 degrees, and the length of the new return air ingate is 3-10 m.
5. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 1, characterized in that: the platform is respectively positioned at the elevation of the bottom plate of the middle-section return air ingate at the shallowest part and above the elevation of the top plate of the fresh return air ingate, and the platform comprises a main beam (20) and a secondary beam (21) which are arranged on the cross section of a shaft of the return air shaft in a criss-cross manner.
6. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 5, wherein the method comprises the following steps: the platform adopts the steel structure formula, and the girder passes through threaded fastener and angle steel (24) with the secondary beam and is connected formation net, and the net is laid and is equipped with bed board (23), and the rigid coupling has stiffening rib (25) that the interval is not more than 0.8m on the bed board.
7. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 6, wherein the method comprises the following steps: the main beams and the secondary beams are coated with hot dip zinc with the thickness of not less than 120 mu m.
8. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 6, wherein the method comprises the following steps: a ladder room (30) is arranged in a shaft of the return air shaft, the ladder room is closed and paved above a platform plate of the original ladder room by adopting a thick-pattern steel plate, and the ladder opening is closed by adopting a cover plate.
9. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 5, wherein the method comprises the following steps: the platform adopts a reinforced concrete beam plate structure, a main beam chisels out an existing well wall (22) of a return air shaft to form a beam pit (29), the main beam and a secondary beam are arranged in a shape like a Chinese character jing, concrete is poured around the main beam and the secondary beam to form a reinforced concrete slab (26), a hoisting access hole (27) is reserved on the reinforced concrete slab between the main beam and the secondary beam, concrete is poured between the existing well wall chiseling part of the return air shaft and the reinforced concrete slab to form a whole, and a movable reinforced concrete cover plate (28) is arranged above the hoisting access hole to seal.
10. The method for modifying the main return air duct suitable for underground concentrated return air according to claim 1, characterized in that: the spraying device adopts a water spraying or mist spraying mode.
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| CN111365056B (en) * | 2020-03-31 | 2021-10-15 | 中铁五局集团有限公司 | Staged ventilation method based on complex cavern group construction |
| CN113513319B (en) * | 2021-06-10 | 2024-03-19 | 铜陵有色金属集团铜冠矿山建设股份有限公司 | Ventilation and cooling method for shaft construction |
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