CN112096395A - Microwave and cavitation jet combined rock breaking cutter head and rock breaking method - Google Patents
Microwave and cavitation jet combined rock breaking cutter head and rock breaking method Download PDFInfo
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- CN112096395A CN112096395A CN202011003153.3A CN202011003153A CN112096395A CN 112096395 A CN112096395 A CN 112096395A CN 202011003153 A CN202011003153 A CN 202011003153A CN 112096395 A CN112096395 A CN 112096395A
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- 239000011435 rock Substances 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 claims description 18
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- 230000033001 locomotion Effects 0.000 claims description 4
- 230000005641 tunneling Effects 0.000 abstract description 15
- 230000009467 reduction Effects 0.000 abstract description 5
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- 230000008646 thermal stress Effects 0.000 description 2
- 208000022971 Tuberculous meningitis Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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Abstract
The invention relates to the technical field of tunneling, in particular to a microwave and cavitation jet combined rock breaking cutterhead and a method. According to the invention, the rock is acted by the microwave and the cavitation jet, and the internal structure of the rock is changed by cooling and heating the rock, so that the reduction of the physical and mechanical properties of the rock is more beneficial to the rock breaking of the hob, thereby overcoming the problems of low tunneling speed, over-high damage of the hob and the like of the cutterhead in an extremely hard rock environment, improving the rock breaking efficiency of the cutterhead and saving the rock breaking cost.
Description
Technical Field
The invention relates to the technical field of tunneling, in particular to a microwave and cavitation jet combined rock breaking cutterhead and a rock breaking method.
Background
In recent years, with rapid development of large-scale projects such as high-speed railways, urban subways, mining and the like, more and more tunnels are being planned and constructed. In hard rock tunneling, safe and reliable tunnel boring machines (TBMs, including open tunnel boring machines and shield machines) are widely used. When the shield machine tunnels in the extremely hard rock section, a shield machine tunnels for a short distance, a large number of cutters are severely worn, so that the cutter changing operation has to be carried out, the tunnel tunneling cost is greatly increased, the tunneling speed is greatly reduced due to the influence, and the tunnel construction period cannot be well guaranteed.
At present, weakening of rock by microwave irradiation is an important problem, when microwave penetrates into rock, polar molecules in rock are caused to generate high-frequency vibration, and heat generated between molecules generates heat to deform and expand mineral particles in rock and limit the mineral particles mutually. Thermal stress is generated near the contact surfaces of different mineral particles, when the thermal stress reaches the strength limit of the rock, the rock is cracked along the contact surfaces of the different mineral particles, microcracks are generated, and the cracks are continuously expanded along with the increase of the temperature of the rock.
Cavitation jets are typically high efficiency jets that utilize cavitation effects. When water flow passes through the sudden change position of the internal section of the spray head, the pressure of the fluid in the section is reduced due to the sudden reduction of the section, and when the pressure reduction value P iscSaturated vapor pressure P less than ambientvWhen the gas is discharged, the contraction section locally generates cavitation to form a plurality of gas nuclei; the subsequent flow channel continues to provide a sufficiently large low pressure region to provide a sufficiently long growth time for the cavitated gas nuclei to become entrained in the fluidAir bubbles. These cavitation bubbles collapse when they reach a high-pressure region, and micro-jet and flow compression waves are generated, which are extremely destructive to the surface of a solid in the vicinity.
Cold-hot cyclic stress rock breaking is studied at the end of the last century, in rapid temperature rise, the strength and elastic parameters of the rock are reduced, the uniaxial compressive strength and tensile strength of the rock are reduced along with the rise of temperature, and when the expansion stress of the rock exceeds the tensile strength of the rock, the interior of the rock is damaged; and during rapid cooling, the failure mode of the rock is changed from brittle failure to quasi-brittle failure, the mineral in the rock does not shrink and coordinate, and cracks are generated in the rock, so that the permeability of the rock is increased. Therefore, the internal structure of the rock is changed after the cold and hot circulation, the physical and mechanical properties of the rock are reduced, and the rock is conveniently broken by the hob cutter.
Under the geological condition of extremely hard rock, the rock breaking speed of the hob is low, and the hob is easy to damage, so that the shield machine can efficiently tunnel in the extremely hard rock environment, and the shield machine needs to be modified to a certain extent. In the existing patent, the microwave and the cutter head are directly combined to break the rock, certain rock breaking efficiency can be improved, but a water flow system such as a water jet is not added in the equipment, so that the situation that the temperature is too high in the rock breaking process to accelerate the abrasion of the hob and certain influence is generated on the cutter head of the shield machine can be possibly caused. The microwave, the water gun and the drill bit are combined to break the rock in the patent, and the device is suitable for small-area rock breaking and still needs a shield machine for building a large tunnel. Therefore, the combination of the microwave and the cavitation jet flow is applied to the cutter head of the shield tunneling machine. In the combined system, the independent rock breaking effect of the microwave, the cavitation jet and the hob on the rock is combined, and the combined rock breaking effect, namely the cold-hot circulation rock breaking effect, is combined, so that the problems that the shield machine is slow in tunneling speed, the hob is damaged too fast and the like in an extremely hard rock environment can be solved, the tunneling efficiency is improved, and the combined system is very significant and has research value.
Disclosure of Invention
The invention aims to solve the problems that a shield tunneling machine is low in tunneling speed and a hob is damaged too fast in an extremely hard rock environment, and the like, and provides a cutter head structure of the shield tunneling machine, wherein the cutter head structure combines microwave-assisted rock breaking, cavitation jet flow rock corrosion, hob rock breaking and cold-hot cycle rock breaking to improve the rock breaking efficiency of the cutter head and save the rock breaking cost.
In order to achieve the purpose, the invention provides a microwave and cavitation jet combined rock breaking cutterhead, which comprises a cutterhead panel and a hob arranged on the cutterhead panel, wherein the cutterhead panel is provided with a plurality of microwave transmitting devices and cavitation jet devices, the microwave transmitting devices can transmit microwaves, and the cavitation jet devices can transmit cavitation jets.
Further, the hob cutter divides the cutter head panel into a plurality of areas, and each area is provided with the microwave transmitting device and the cavitation jet device.
Further, microwave emitter mainly comprises microwave antenna, metal dustcoat, waveguide, microwave generation module and mounting bracket, the microwave antenna sets up in the through-hole of blade disc panel, and perpendicular the blade disc panel arranges, the metal dustcoat is perpendicular the blade disc panel arranges, with blade disc panel swing joint, the microwave antenna with the metal dustcoat is all fixed on the microwave antenna mounting bracket, the microwave antenna mounting bracket is located blade panel is inboard, simultaneously a pneumatic cylinder is connected to the rear side of microwave antenna mounting bracket, microwave generation module sets up the inboard of blade disc panel, through the waveguide with the microwave antenna is connected.
Furthermore, each microwave transmitting device comprises five microwave antennas, wherein one microwave antenna is arranged at the center, and the other four microwave antennas are uniformly distributed on a circle with the center as the center.
Further, cavitation jet device includes cavitation jet, shower nozzle safety cover and high-pressure water flow system, cavitation jet perpendicular to the cutter head panel sets up, cavitation jet follows through-hole on the cutter head panel stretches out, the shower nozzle safety cover sets up the front end at the through-hole, is used for the protection cavitation jet shower nozzle.
Further, cavitation jet device is located microwave emitter with between the hobbing cutter, cavitation jet device sets up multiunit cavitation jet nozzle, distributes and is in each region of blade disc panel, every group contains six cavitation jet nozzle is straight line distribution and with near the straight line contained angle that the hobbing cutter links into is 45 degrees, simultaneously cavitation jet nozzle is located microwave emitter direction of motion's rear. Each group of cavitation jet nozzles are arranged on a nozzle mounting frame, and the rear part of the nozzle mounting frame is connected with a hydraulic cylinder.
The invention also provides a microwave and cavitation jet combined rock breaking method, which comprises the following steps:
step one, normally propelling and rotating a cutter head, simultaneously starting the cavitation jet device, breaking rock by matching the hob and the cavitation jet, and taking the microwave transmitting device into a cutter head panel;
step two, after extremely hard rocks are blocked, closing the cavitation jet device, stopping the propulsion and rotation of the cutter head, retracting the cutter head, extending the microwave antenna and the metal outer cover out of the cutter head panel, starting the microwave transmitting device, and meanwhile, slowly rotating the cutter head to heat the rocks to 450-500 ℃;
step three, closing and withdrawing the microwave transmitting device, extending out the cavitation jet nozzle, starting cavitation jet and keeping the cutter head rotating, and withdrawing the cavitation jet nozzle after the temperature of the rock is reduced to below 300 ℃;
and step four, circulating the step two and the step three for 3-5 times, and reducing the temperature of the rock to the normal temperature by the last cavitation jet.
The scheme of the invention has the following beneficial effects:
the microwave transmitting device and the cavitation jet device are arranged on the rock breaking cutterhead, and the hob and the cavitation jet are combined together to break rock in the tunneling process of the medium-hard rock tunnel. Cavitation jet flow on the front side of the hob in the moving direction erodes the surface of the hard rock, so that the rock strength is reduced; then rolling the rock eroded by cavitation jet flow by a hob to form main damage to the rock; and then, the cavitation jet flow behind the hob expands cracks generated by the rock body extruded by the hob and washes away rock debris. The combined rock breaking mode greatly improves the rock breaking efficiency of the shield tunneling machine in the medium-hard rock environment.
Under the geological conditions of hard rock and extremely hard rock, the combination of the hob, the microwave and the cavitation jet breaks the rock. (1) The rock is rapidly heated to 450-500 ℃ through microwave heating, the expansion stress of the rock exceeds the tensile strength of the rock, the internal damage of the rock is serious, and the microwave irradiation achieves a certain rock breaking effect; (2) when the cavitation jet is sprayed on the rock, erosion is caused to the surface of the rock, cracks of the rock are enlarged, and the cavitation jet causes certain damage to the rock; (3) the cavitation jet flow quickly cools the rock, the temperature gradient on the surface of the rock is quickly increased, and the tensile strength of the rock is reached when the temperature is lower than 300 ℃, so that the rock is damaged in the quick cooling process; (4) the rapid heating of the rock by the microwaves is combined with the rapid cooling of cavitation jet, cold and hot circulation is generated on the rock, the internal structure of the rock is changed after the circulation is carried out for 3-5 times, and the reduction of the physical and mechanical properties of the rock is more favorable for the rock breaking of the hob, so that the problems that the tunneling speed of the cutterhead is low, the hob is damaged too fast and the like under an extremely hard rock environment are solved, the rock breaking efficiency of the cutterhead is improved, and the rock breaking cost is saved.
Drawings
FIG. 1 is a schematic view of the cutter head structure of the present invention;
FIG. 2 is a schematic structural view (retracted state) of the microwave transmitting device of the present invention;
FIG. 3 is a schematic structural view (extended state) of the microwave transmitting device of the present invention;
FIG. 4 is a schematic structural view of a cavitation jet device of the present invention;
fig. 5 is a schematic diagram of the cavitation jet device of the present invention.
[ description of reference ]
1-a cutter head panel; 2-positive hob; 3-central hob; 4-a microwave emitting device; 5-cavitation jet device; 6-a microwave antenna; 7-a metal housing; 8-a waveguide; 9-a microwave generation module; 10-microwave antenna mounting; 11-a first hydraulic cylinder; 12-cavitation jet head; 13-a sprinkler head protective cover; 14-rock mass; 15-a second hydraulic cylinder; 16-a high pressure water flow system; 17-shower nozzle mounting bracket.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
as shown in fig. 1, an embodiment 1 of the present invention provides a microwave and cavitation jet combined rock-breaking cutterhead, which includes a cutterhead panel 1, a positive hob 2 and a central hob 3, which are arranged on the cutterhead panel 1 in a cross shape. The hobs divide the cutterhead panel 1 into four areas, and the movement tracks of each hob are not coincident, and the spiral distribution rule is followed.
Each area of the cutter head panel 1 is provided with a microwave transmitting device 4 and a cavitation jet device 5, wherein the distances from the microwave transmitting devices 4 to the center position of the cutter head are different. The microwave transmitting device 4 includes a set of microwave antennas 6, each set of microwave antennas 6 includes five antennas, one of the antennas 6 is used as a center, and the other four antennas are uniformly distributed on a circle using the center as a center. In addition, each microwave emitting device 4 is provided with a metal outer cover 7 for preventing the microwave from randomly diffusing, and the center position of the metal outer cover coincides with the center position of the group of microwave antennas 6.
The specific structure of the microwave transmitting device 4 is shown in fig. 2, and mainly comprises a microwave antenna 6, a metal outer cover 7, a waveguide 8, a microwave generating module 9, and a microwave antenna mounting rack 10. The microwave antenna 6 is arranged in a through hole additionally arranged on the cutter head panel 1 and is vertical to the cutter head panel 1, and the distance from the top end of the microwave antenna to the outer side surface of the cutter head panel after adduction is preferably 5-10 cm. The metal outer cover 7 is arranged vertical to the cutter head panel 1, can move relative to the cutter head panel 1, and the top end of the metal outer cover is flush with the cutter head surface 1 in a contraction state. The microwave antenna 6 and the metal outer cover 7 are both arranged on a microwave antenna mounting frame 10 positioned on the inner side of the cutterhead panel 1, and the rear side of the microwave antenna mounting frame 10 is connected with a first hydraulic cylinder 11. The microwave generation module 9 is also positioned on the inner side of the cutterhead panel 1 and is connected with the microwave antenna 6 through the waveguide 8 on the microwave antenna mounting frame 10.
Fig. 3 shows that when the microwave-assisted rock breaking is performed, the hydraulic cylinder 11 drives the microwave antenna mounting frame 10 to move outwards from the cutter head, so that the microwave antenna 6 and the metal outer cover 7 extend out of the cutter head panel 1, and the microwave generation module 9 is started to heat the rock.
Meanwhile, a cavitation jet device 5 is also arranged on the cutter head panel 1 and is specifically positioned between the microwave transmitting device 4 and the positive hob 2. In this embodiment, the cavitation jet devices 5 are arranged in four groups, and are distributed in four regions of the cutter head panel 1, each group includes six cavitation jet devices 5, and the cavitation jet devices are linearly distributed, have a linear included angle of 45 degrees with the adjacent hob, and are located behind the movement direction of the microwave emitter 4.
Specifically, as shown in fig. 4, the cavitation jet device 5 is composed of a cavitation jet nozzle 12, a nozzle protection cover 13 and a high-pressure water flow system 16, the cavitation jet nozzle 12 is arranged perpendicular to the cutter head panel 1, the cavitation jet direction of the cavitation jet nozzle is also perpendicular to the cutter head plane, and the cavitation jet nozzle 12 extends out of the outer side of the cutter head panel 1 by a certain distance. The cavitation jet nozzle 12 extends out of the cutter from a through hole additionally arranged on the cutter panel 1, and the nozzle protective cover 13 is arranged at the front end of the through hole and used for protecting the cavitation jet nozzle 12, and the nozzle protective cover 13 is also provided with the through hole. Each group of cavitation jet nozzles 12 are mounted on a nozzle mounting frame 17, and a second hydraulic cylinder 15 is connected behind the nozzle mounting frame 17.
As shown in figure 5, the high-pressure water flow system is started to generate cavitation jet, and the cavitation jet 12 is used for guiding to spray on the surface of the rock 14, so that the effects of temperature reduction and damage are generated.
Example 2:
the embodiment 2 of the invention provides a microwave and cavitation jet combined rock breaking method, which specifically comprises the following steps:
step one, the cutter head is normally pushed and rotated, meanwhile, the cavitation jet device 5 is started, the hob and the cavitation jet are matched to break rock, and at the moment, the microwave transmitting device 4 is accommodated in the cutter head panel 1.
And step two, after extremely hard rock is blocked, closing the cavitation jet device 5, stopping the propulsion and rotation of the cutter head, retracting the cutter head for 5-10mm, pushing the mounting frame 10 by using the hydraulic cylinder 11 to enable the microwave antenna 6 and the metal outer cover 7 to extend out of the cutter head panel 1 for a certain distance, starting the microwave transmitting device 4, enabling the microwave generated by the microwave generating module 9 to reach the microwave antenna 6 through the waveguide 8, transmitting the microwave to the rock body 14 by the microwave antenna 6, concentrating the microwave by the metal outer cover 7 to heat the rock body 14, and meanwhile enabling the cutter head to slowly rotate to heat the rock to 450-500 ℃.
And step three, after the microwave transmitting device 4 is started for a period of time, closing and withdrawing the microwave transmitting device 4, extending the cavitation jet nozzle 12, starting cavitation jet and keeping the cutter head rotating, and withdrawing the cavitation jet nozzle 12 after the temperature of the rock is reduced to below 300 ℃.
And step four, circulating the step two and the step three for a plurality of times. After the circulation is carried out for a certain number of times, the internal structure of the rock is changed after the cold and hot circulation, the microwave heats the rock to rapidly raise the temperature, the strength of the rock is reduced, the uniaxial compression strength and the tensile strength of the rock are reduced along with the rise of the temperature, and when the expansion stress of the rock exceeds the tensile strength of the rock, the interior of the rock is damaged; when cavitation jet flow rapidly cools the rock, the failure mode of the rock is changed from brittle failure to quasi-brittle failure, the mineral in the rock does not shrink and coordinate, cracks are generated in the rock, and therefore the permeability of the rock is increased. Therefore, besides the damage of the microwave and cavitation jet to the rock, the cold-hot circulation also plays a certain role in damaging the rock, the internal structure of the rock is changed, the physical and mechanical properties of the rock are reduced, and the rock is conveniently broken by the hob cutter.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a broken rock blade disc of microwave and cavitation jet combination, includes the blade disc panel and sets up hobbing cutter on the blade disc panel, its characterized in that, be provided with a plurality of microwave emitter and cavitation jet device on the blade disc panel, microwave emitter can launch the microwave, cavitation jet device can launch the cavitation jet.
2. A microwave and cavitation jet combined rock breaking cutterhead according to claim 1, wherein the hob divides the cutterhead panel into a plurality of zones, each zone being provided with said microwave emitting means and said cavitation jet means.
3. The microwave and cavitation jet combined rock breaking cutterhead of claim 2, wherein the microwave emitting device mainly comprises a microwave antenna, a metal outer cover, a waveguide, a microwave generating module and a mounting rack, the microwave antenna is arranged in the through hole of the cutterhead panel and is perpendicular to the cutterhead panel, the metal outer cover is perpendicular to the cutterhead panel, the cutterhead panel is arranged and is movably connected with the cutterhead panel, the microwave antenna and the metal outer cover are fixed on the microwave antenna mounting rack, the microwave antenna mounting rack is located on the inner side of the blade panel, meanwhile, a first hydraulic cylinder is connected to the rear side of the microwave antenna mounting rack, the microwave generating module is arranged on the inner side of the cutterhead panel, and the waveguide is connected with the microwave antenna.
4. A rock breaking cutterhead in combination with microwaves and cavitation jets according to claim 3, wherein each microwave emitting device includes five microwave antennas, one of which is arranged in the center and the other four of which are evenly distributed on a circle centered on the center.
5. The microwave and cavitation jet combined rock breaking cutterhead of claim 4, wherein the cavitation jet device includes cavitation jet, a nozzle protection cover and a high pressure water flow system, the cavitation jet is perpendicular to the cutterhead panel, the cavitation jet is followed through holes on the cutterhead panel are extended out, the nozzle protection cover is arranged at the front end of the through holes and used for protecting the cavitation jet.
6. The microwave and cavitation jet combined rock breaking cutterhead of claim 5, wherein the cavitation jet device is located the microwave emitter with between the hobbing cutter, the cavitation jet device sets up multiunit cavitation jet nozzle, distributes each region of cutterhead panel, every group contains six cavitation jet nozzle is straight line distribution and with near the straight line contained angle that the hobbing cutter links into is 45 degrees, simultaneously cavitation jet nozzle is located the rear of microwave emitter direction of motion, every group cavitation jet nozzle installs on a shower nozzle mounting bracket, connect the second hydraulic cylinder behind the shower nozzle mounting bracket.
7. A rock breaking method combining microwave and cavitation jet flow, which adopts the rock breaking cutterhead of claim 6, and is characterized by comprising the following steps:
step one, normally propelling and rotating a cutter head, simultaneously starting the cavitation jet device, breaking rock by matching the hob and the cavitation jet, and taking the microwave transmitting device into a cutter head panel;
step two, after extremely hard rocks are blocked, closing the cavitation jet device, stopping the propulsion and rotation of the cutter head, retracting the cutter head, extending the microwave antenna and the metal outer cover out of the cutter head panel, starting the microwave transmitting device, and meanwhile, slowly rotating the cutter head to heat the rocks to 450-500 ℃;
step three, closing and withdrawing the microwave transmitting device, extending out the cavitation jet nozzle, starting cavitation jet and keeping the cutter head rotating, and withdrawing the cavitation jet nozzle after the temperature of the rock is reduced to below 300 ℃;
and step four, circulating the step two and the step three for 3-5 times, and reducing the temperature of the rock to the normal temperature by the last cavitation jet.
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| CN202011003153.3A CN112096395A (en) | 2020-09-22 | 2020-09-22 | Microwave and cavitation jet combined rock breaking cutter head and rock breaking method |
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| CN202011003153.3A CN112096395A (en) | 2020-09-22 | 2020-09-22 | Microwave and cavitation jet combined rock breaking cutter head and rock breaking method |
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Cited By (5)
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| CN113107516A (en) * | 2021-05-13 | 2021-07-13 | 盾构及掘进技术国家重点实验室 | Hard rock tunnel boring machine with microwave heating and high-pressure water cutting combined assistance for rock breaking |
| CN113790060A (en) * | 2021-09-16 | 2021-12-14 | 中国矿业大学(北京) | Drilling and tunneling equipment and method |
| WO2022127090A1 (en) * | 2020-12-17 | 2022-06-23 | 深圳大学 | Microwave rock breaking drilling device |
| CN114753770A (en) * | 2022-03-31 | 2022-07-15 | 中南大学 | Porous phase change rotary cutting type tunneling drill bit and method |
| US12031437B2 (en) * | 2021-05-13 | 2024-07-09 | State Key Laboratory of Shield Machine and Boring Technology | Hard rock tunnel boring machine combining microwave heating with high pressure water cutting for assisting in rock breaking |
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| CN113107516B (en) * | 2021-05-13 | 2022-02-22 | 盾构及掘进技术国家重点实验室 | Hard rock tunnel boring machine with microwave heating and high-pressure water cutting combined assistance for rock breaking |
| WO2022236908A1 (en) * | 2021-05-13 | 2022-11-17 | 盾构及掘进技术国家重点实验室 | Hard rock tunnel boring machine combining microwave heating and high-pressure water cutting to assist rock breaking |
| US20230080875A1 (en) * | 2021-05-13 | 2023-03-16 | State Key Laboratory of Shield Machine and Boring Technology | Hard rock tunnel boring machine combining microwave heating with high pressure water cutting for assisting in rock breaking |
| US12031437B2 (en) * | 2021-05-13 | 2024-07-09 | State Key Laboratory of Shield Machine and Boring Technology | Hard rock tunnel boring machine combining microwave heating with high pressure water cutting for assisting in rock breaking |
| CN113790060A (en) * | 2021-09-16 | 2021-12-14 | 中国矿业大学(北京) | Drilling and tunneling equipment and method |
| CN113790060B (en) * | 2021-09-16 | 2023-03-14 | 中国矿业大学(北京) | Drilling and tunneling equipment and method |
| CN114753770A (en) * | 2022-03-31 | 2022-07-15 | 中南大学 | Porous phase change rotary cutting type tunneling drill bit and method |
| CN114753770B (en) * | 2022-03-31 | 2023-02-17 | 中南大学 | Porous phase change rotary cutting type tunneling drill bit and method |
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