CN113638741B - Heading machine for reducing stress of surrounding rock of tunnel and construction method thereof - Google Patents
Heading machine for reducing stress of surrounding rock of tunnel and construction method thereof Download PDFInfo
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- CN113638741B CN113638741B CN202111062635.0A CN202111062635A CN113638741B CN 113638741 B CN113638741 B CN 113638741B CN 202111062635 A CN202111062635 A CN 202111062635A CN 113638741 B CN113638741 B CN 113638741B
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- cutterhead
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- cutter head
- vibration impactor
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- 239000011435 rock Substances 0.000 title claims abstract description 70
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 230000005641 tunneling Effects 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 10
- 230000009347 mechanical transmission Effects 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- E21D9/0875—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 movable support arm carrying cutting tools for attacking the front face, e.g. a bucket
-
- 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
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a tunneling machine for reducing stress of surrounding rock of a tunnel and a construction method thereof, the tunneling machine comprises a shield body and a cutter head, wherein a mounting hole is formed in the cutter head, an advanced drilling device corresponding to the mounting hole is arranged on the shield body at the rear side of the cutter head, the advanced drilling device can drill an advanced pilot hole on a front face through the mounting hole, the shield body is connected with a first vibration impactor through a first axial telescopic mechanism, the distance between the first vibration impactor and the rotation center of the cutter head is equal to the distance between the advanced drilling device and the rotation center of the cutter head, the rock mass of the face can be presplitted and weakened through installing the first vibration impactor in the advanced pilot hole, and finally the rock mass is crushed through a metal cutter on the cutter head. According to the invention, the impact force is applied to the rock stratum by using the vibration impactor, and rock can be easily broken by using the digging hob or the scraper, so that the abrasion of the metal cutter is greatly reduced, the service life of the metal cutter is prolonged, the construction efficiency is improved, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of tunneling mechanisms of tunneling machines, in particular to a tunneling machine for reducing stress of surrounding rock of a tunnel and a construction method thereof.
Background
At present, tunneling aims at rock stratum, mainly relies on disc-type hob to squeeze rock to achieve the purpose of breaking rock mass, mainly overcomes the compressive strength of the rock, and has good rock breaking efficiency aiming at the rock stratum with general strength. However, when harder rocks are encountered in the tunneling process of the tunneling machine, the efficiency of the hob for crushing the rocks is obviously reduced, abnormal wear and replacement frequency of the hob are increased, so that the tunneling efficiency of the shield is reduced, and the tunneling cost is increased.
The invention patent with the publication date 2018.10.26 and the publication number CN108708738A discloses a combined TBM for realizing rock burst pretreatment and a rock burst pretreatment tunneling method, which relate to the field of tunnel and underground engineering construction. According to the technical scheme, the surrounding rock wall rock mass is excited by the high-frequency vibration equipment to vibrate and impact, cracks in the rock mass are accelerated to expand, the effect of releasing stress is achieved, the rock burst occurrence risk is reduced, but the high-frequency vibration equipment is arranged in the circumferential direction and cannot assist a hob of a heading machine to effectively weaken hard rock in front of a face.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a tunneling machine for reducing stress of tunnel surrounding rock and a construction method thereof, and solves the technical problems of low efficiency and high cost of the existing tunneling machine hob for tunneling hard rock.
The technical scheme of the invention is realized as follows: the utility model provides a reduce tunnel surrounding rock stress's entry driving machine and construction method, includes shield body and blade disc, be provided with the mounting hole on the blade disc, be provided with the leading drilling equipment that corresponds with the mounting hole on the shield body of blade disc rear side, leading drilling equipment can drill out leading pilot hole through the mounting hole at the face in place ahead, the shield body is connected with first vibrations impacter through first axial telescopic machanism, the distance of first vibrations impacter from the blade disc center of revolution equals with leading drilling equipment distance from the blade disc center of revolution, through installing first vibrations impacter in leading pilot hole, can presplitting the weakening of face rock mass, the metal cutter on the rethread blade disc breaks the rock mass.
Further, the cutter head is provided with the small cutter head which can stretch forwards, the leading hole can be dug out on the face firstly, the leading hole is beneficial to the transmission and vibration enhancement of the vibration wave of the first vibration impactor in the leading hole, the face is easier to presplit, and the cutter head is not excessively replaced even if the cutter head is required to be replaced.
Further, the periphery of the small cutterhead is provided with the second vibration impactor, so that the rock mass can be pre-cracked in advance before the first vibration impactor is started, and the small cutterhead can be synchronously used with the first vibration impactor, so that the small cutterhead has a better pre-cracking effect.
Further, the small cutterhead is arranged at the center of the cutterhead through the second axial telescopic mechanism, so that the penetrability of vibration pre-cracking is more excellent.
Further, the mounting holes and the advanced drilling devices are arranged in pairs and are provided with a plurality of pairs, and the number of the mounting holes and the advanced drilling devices can be selected according to the size of the cutterhead and the rock hardness of the face.
Further, the distance between each mounting hole and the revolving center of the cutterhead is different.
Or the distance between each mounting hole and the rotation center of the cutterhead is the same, and the equal circumferential angles are distributed at the edge part of the cutterhead.
The first axial telescopic mechanism is a pneumatic telescopic mechanism or a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism; the second axial telescopic mechanism is a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism.
A construction method of a heading machine for reducing stress of surrounding rock of a tunnel comprises the following steps:
firstly, the cutterhead is controlled to be kept static, so that the small cutterhead is driven forward to enter and exit the advanced hole, and then a second vibration impactor is started to presplit surrounding rock.
And then controlling the cutter head to rotate so that the mounting holes correspond to the drill rods of the advanced drilling device in front-back direction, and starting the advanced drilling device to drill the advanced drill guide holes.
And then controlling the cutter disc to rotate to a position where the mounting hole is opposite to the advanced drilling hole and the first vibration impactor, and controlling the first axial telescopic mechanism to drive the first vibration impactor to pass through the mounting hole, so that the first vibration impactor is placed in the advanced pilot tunnel.
The first shock impactor is then activated or the second shock impactor is simultaneously activated to act on the formation until the rock weakens.
And finally, enabling the first vibration impactor and the second vibration impactor to restore to the original positions, and starting the cutterhead. Tunneling is completed by extruding or tearing the rock through a metal cutter on the cutterhead.
Further, the drill bit of the advanced drilling device is replaceable, the drill bit comprises a plurality of selectable drilling holes, and the specifications of the corresponding first vibration impactor and the corresponding second vibration impactor are calculated according to the hardness condition of the rock, so that the specifications of the advanced drilling device are determined.
Further, the working power of the vibration impactor is adjustable, and the required vibration frequency, depth and amplitude are calculated according to different rock hardness, so that the working parameters of the vibration impactor are adjusted.
According to the invention, the rock stratum is forced to generate vibration cracks by applying impact force to the rock stratum by using the vibration impactor, so that the stress of surrounding rock is released, the aim of reducing the compressive strength of the rock is fulfilled, the weakened rock strength is reduced, the brittleness is increased, the cracks in the rock are expanded to a large extent and deep, at the moment, the rock can be easily broken by the hob or the scraper of the heading machine, the abrasion of a metal cutter is greatly reduced, the service life of the metal cutter is prolonged, the construction efficiency is improved, and the construction cost is reduced. The construction method for reducing the stress of the surrounding rock of the tunnel by active vibration is characterized in that the penetration effect of impact force can be enhanced by simultaneous operation of multiple points, the number and length of rock stratum cracks can be continuously developed along with the increase of the number of impact operations, the connectivity of the cracks is continuously enhanced, crack grids are formed, and the weakening effect of the rock is enhanced. The invention is not only suitable for tunneling hard rock geology, but also suitable for tunneling soft rock stratum.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a front view of a cutterhead in accordance with the present invention;
Wherein: 1. the device comprises a shield body, 2, a cutter head, 3, an advanced drilling device, 4, a first vibration impactor, 5, a small cutter head, 6, a second vibration impactor, 7 and a mounting hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Embodiment 1, a heading machine for reducing stress of surrounding rock of a tunnel, as shown in fig. 1, includes a shield body 1 and a cutter head 2, wherein a mounting hole 7 is provided on the cutter head 2, a leading drilling device 3 corresponding to the mounting hole 7 is provided on the shield body 1 at the rear side of the cutter head 2, and the leading drilling device 3 can drill a leading pilot tunnel through the mounting hole 7 on a face in front. The shield body 1 is connected with a first vibration impactor 4 through a first axial telescopic mechanism, and the first axial telescopic mechanism is a pneumatic telescopic mechanism or a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism. The distance between the first vibration impactor 4 and the rotation center of the cutter head 2 is equal to the distance between the advanced drilling device 3 and the rotation center of the cutter head 2, the first vibration impactor 4 is installed in the advanced pilot tunnel to presplit and weaken the rock mass of the face, and finally the rock mass is crushed by the metal cutter on the cutter head 2.
The mounting holes 7 and the advanced drilling device 3 are arranged in pairs and are provided with a plurality of pairs, and the number of the mounting holes 7 and the advanced drilling device 3 can be selected according to the size of the cutterhead 2 and the rock hardness of the face. As shown in fig. 2, the mounting holes 7 are equally spaced from the center of rotation of the cutterhead 2 and equally circumferentially distributed on the edge portion of the cutterhead 2. Or the distance between each mounting hole 7 and the rotation center of the cutterhead 2 is different.
The cutter head 2 is provided with the small cutter head 5 which can stretch forwards, the leading hole can be dug out on the face firstly, the leading hole is conducive to the transmission and vibration enhancement of the vibration wave of the first vibration impactor 4 in the leading hole, the face is easier to presplit, and the cutter head 5 is not excessively replaced even if the cutter head is required to be replaced. The small cutterhead 5 is arranged at the center of the cutterhead 2 through a second axial telescopic mechanism, so that the penetrability of vibration pre-cracking is more excellent. The second axial telescopic mechanism is a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism.
The periphery of the cutterhead 5 is provided with a second vibration impactor 6, so that the rock mass can be pre-cracked in advance before the first vibration impactor 4 is started, and the rock mass can be synchronously used with the first vibration impactor 6, so that a better pre-cracking effect is achieved.
Embodiment 2, a construction method of a heading machine for reducing stress of surrounding rock of a tunnel, comprising the following steps:
firstly, controlling the cutterhead 2 to keep static, enabling the small cutterhead 5 to tunnel forwards to form a hole beyond the front hole, and then starting a second vibration impactor 6 to presplit surrounding rock;
then, the cutter head 2 is controlled to rotate so that the mounting holes 7 correspond to the drill rods of the advanced drilling device 3 in front-back direction, and the advanced drilling device 3 is started to drill an advanced drill guide hole;
then the cutter head 2 is controlled to rotate to a position where the mounting hole 7 is opposite to the advanced drilling hole and the first vibration impactor 4, and the first axial telescopic mechanism is controlled to drive the first vibration impactor 4 to pass through the mounting hole 7, so that the first vibration impactor 4 is placed in the advanced pilot tunnel;
then the first vibration impactor 4 or the second vibration impactor 6 is started to act on the rock stratum at the same time until the rock weakens;
finally, the first vibration impactor 4 and the second vibration impactor 6 are restored to the original positions, and the cutterhead 2 is started. Tunneling is accomplished by pressing or tearing the rock with a metal cutter on the cutterhead 2.
Further, the drill bit of the advanced drilling device 3 is replaceable, including a plurality of selectable drilling holes, and the specifications of the corresponding first vibration impactor 4 and the corresponding second vibration impactor 6 are calculated according to the hardness condition of the rock, so as to determine the specifications of the advanced drilling device 3.
Further, the working power of the vibration impactor is adjustable, and the required vibration frequency, depth and amplitude are calculated according to different rock hardness, so that the working parameters of the vibration impactor are adjusted.
The structure of this embodiment is the same as that of embodiment 1.
The present invention is not limited to the conventional technical means known to those skilled in the art.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. The construction method of the heading machine for reducing the stress of the surrounding rock of the tunnel comprises a shield body (1) and a cutter head (2), and is characterized in that: the cutter head (2) is provided with a mounting hole (7), the shield body (1) at the rear side of the cutter head (2) is provided with an advanced drilling device (3) corresponding to the mounting hole (7), the shield body (1) is connected with a first vibration impactor (4) through a first axial telescopic mechanism, and the distance between the first vibration impactor (4) and the rotation center of the cutter head (2) is equal to the distance between the advanced drilling device (3) and the rotation center of the cutter head (2);
a small cutterhead (5) which can extend forwards is arranged on the cutterhead (2);
The periphery of the small cutterhead (5) is provided with a second vibration impactor (6);
the small cutterhead (5) is arranged at the center of the cutterhead (2) through a second axial telescopic mechanism;
The mounting holes (7) and the advanced drilling device (3) are arranged in pairs and are provided with a plurality of pairs;
The distances between each mounting hole (7) and the rotation center of the cutterhead (2) are different; or the distance between each mounting hole (7) and the rotation center of the cutterhead (2) is the same, and the equal circumferential angles are distributed at the edge part of the cutterhead (2);
The first axial telescopic mechanism is a pneumatic telescopic mechanism or a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism; the second axial telescopic mechanism is a hydraulic telescopic mechanism or a mechanical transmission telescopic mechanism;
the construction method comprises the following steps: firstly, controlling a cutterhead (2) to keep static, enabling a small cutterhead (5) to tunnel forwards to form a super-front hole, and then starting a second vibration impactor (6) to presplit surrounding rock;
then, the cutter head (2) is controlled to rotate so that the mounting holes (7) correspond to the front and back of the drill rod of the advanced drilling device (3), and the advanced drilling device (3) is started to drill the advanced drilling pilot hole;
Then the cutter head (2) is controlled to rotate to a position where the mounting hole (7) is opposite to the advanced drilling hole and the first vibration impactor (4), the first axial telescopic mechanism is controlled to drive the first vibration impactor (4) to pass through the mounting hole (7), and the first vibration impactor (4) is placed in the advanced pilot tunnel;
then starting the first vibration impactor (4) or simultaneously starting the second vibration impactor (6) to act on the rock stratum until the rock is weakened;
Finally, the first vibration impactor (4) and the second vibration impactor (6) are restored to the original positions, the cutterhead (2) is started, and tunneling is completed by extruding or tearing rocks through a metal cutter on the cutterhead (2).
2. The construction method of a heading machine for reducing stress of surrounding rocks of a tunnel according to claim 1, wherein: the drill bit of the advanced drilling device (3) is replaceable, the drill bit comprises a plurality of selectable drilling holes, and the specifications of the corresponding first vibration impactor (4) and the corresponding second vibration impactor (6) are calculated according to the hardness condition of rock, so that the specifications of the advanced drilling device (3) are determined.
3. The construction method of a heading machine for reducing stress of surrounding rocks of a tunnel according to claim 1, wherein: the working power of the vibration impactor is adjustable, and the required vibration frequency, depth and amplitude are calculated according to different rock hardness, so that the working parameters of the vibration impactor are adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111062635.0A CN113638741B (en) | 2021-09-10 | 2021-09-10 | Heading machine for reducing stress of surrounding rock of tunnel and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111062635.0A CN113638741B (en) | 2021-09-10 | 2021-09-10 | Heading machine for reducing stress of surrounding rock of tunnel and construction method thereof |
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| Publication Number | Publication Date |
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| CN113638741A CN113638741A (en) | 2021-11-12 |
| CN113638741B true CN113638741B (en) | 2024-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111062635.0A Active CN113638741B (en) | 2021-09-10 | 2021-09-10 | Heading machine for reducing stress of surrounding rock of tunnel and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113638741B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856595B (en) * | 2022-04-22 | 2023-02-03 | 河海大学 | Double-shield-shell separated full-section advanced pre-splitting tunnel boring machine and boring method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011111711A (en) * | 2009-11-23 | 2011-06-09 | Kazuhiro Ikeda | Shield tunnel boring machine |
| CN108708738A (en) * | 2018-06-01 | 2018-10-26 | 中国科学院武汉岩土力学研究所 | Realize that the pretreated combination type T BM of rock burst and rock burst pre-process driving method |
| CN208236418U (en) * | 2018-06-01 | 2018-12-14 | 中国科学院武汉岩土力学研究所 | Pilot heading combination type T BM and driving system |
| CN208996736U (en) * | 2018-11-08 | 2019-06-18 | 南京工业职业技术学院 | A kind of impact rolling cutting composite rock breaking tool |
| CN113107515A (en) * | 2021-04-15 | 2021-07-13 | 中铁工程装备集团有限公司 | Free-section tunnel boring machine |
| CN113217005A (en) * | 2021-05-17 | 2021-08-06 | 中铁工程装备集团有限公司 | Construction device and construction method for reducing high ground stress of tunnel by using laser |
| CN113356876A (en) * | 2021-07-28 | 2021-09-07 | 中国铁建重工集团股份有限公司 | Rock breaking cutter head, tunnel boring machine and using method of tunnel boring machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9500077B2 (en) * | 2014-01-07 | 2016-11-22 | Shandong University | Comprehensive advanced geological detection system carried on tunnel boring machine |
-
2021
- 2021-09-10 CN CN202111062635.0A patent/CN113638741B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011111711A (en) * | 2009-11-23 | 2011-06-09 | Kazuhiro Ikeda | Shield tunnel boring machine |
| CN108708738A (en) * | 2018-06-01 | 2018-10-26 | 中国科学院武汉岩土力学研究所 | Realize that the pretreated combination type T BM of rock burst and rock burst pre-process driving method |
| CN208236418U (en) * | 2018-06-01 | 2018-12-14 | 中国科学院武汉岩土力学研究所 | Pilot heading combination type T BM and driving system |
| CN208996736U (en) * | 2018-11-08 | 2019-06-18 | 南京工业职业技术学院 | A kind of impact rolling cutting composite rock breaking tool |
| CN113107515A (en) * | 2021-04-15 | 2021-07-13 | 中铁工程装备集团有限公司 | Free-section tunnel boring machine |
| CN113217005A (en) * | 2021-05-17 | 2021-08-06 | 中铁工程装备集团有限公司 | Construction device and construction method for reducing high ground stress of tunnel by using laser |
| CN113356876A (en) * | 2021-07-28 | 2021-09-07 | 中国铁建重工集团股份有限公司 | Rock breaking cutter head, tunnel boring machine and using method of tunnel boring machine |
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| Publication number | Publication date |
|---|---|
| CN113638741A (en) | 2021-11-12 |
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