CN108256168A - A kind of compound stratum shield hob abrasion amount determines method - Google Patents
A kind of compound stratum shield hob abrasion amount determines method Download PDFInfo
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Abstract
The present invention provides a kind of compound stratum shield hob abrasion amounts to determine method, including：The formation strength S of the first step, the distribution of strata situation that tunnel plotted line curb line is determined by probing method and unconfined compression test and each stratum；Second step, the shield parameter in collection work progress and formation parameter determine the Dynamic Amplification Factor n of hobboing cutter to be predicteddAnd friction coefficient α；Third step determines according to shield-tunneling construction tool changing early period data friction energy and hobboing cutter adds up related coefficient k between wear extent Q；4th step determines accumulative wear extent Q, and according to wear allowance Q according to prediction model and driving number of rings N0Determine the opportunity of replacement hobboing cutter.Using the method for the present invention, it can realize that reasonable arrangement opens a position tool changing opportunity, the purpose that reduces tool changing cost, shorten construction period.
Description
Technical field
The present invention relates to the compound stratum shield technique in a kind of underground engineering technical field, specifically, being a kind of compound
Stratum shield hob abrasion amount determines method.
Background technology
In recent years, with the fast development of China's urban construction, subway is because its transport is efficient, environmental perturbation is small and underground
The advantages that space availability ratio is high is increasingly becoming the first choice of newly-built public transport.But as a kind of underground structrue engineering, subway construction
There is higher requirement to Construction Technology.Although subway can avoid the geology item there are security risk in location and design as possible
Part, but since some urban geology conditions are complex or the considerations of for urban planning and construction cost etc. so that
Subway line can be inevitably by complicated geological conditions such as compound stratum etc..Shield-tunneling construction is carried out in compound stratum
When, shut down one of the main reason for hobboing cutter replaced and be seriously worn on cutterhead is delay construction speed.If it can be applied in shield
During work, hob abrasion amount and tool change time and place are effectively predicted, have to improving working security and economy
Important meaning.
It is found through being retrieved to existing technical literature, application No. is：201510617860.4 publication No. is：
CN105352463A, patent name are：Hard rock tunnel tunnels the real-time computing technique of machine disk cutter wear extent, which proposes
From the mechanical analysis of hobboing cutter broken rock, the relationship between cutting coefficient and hobboing cutter broken rock arc length is established, was constructed in conjunction with TBM
The boring parameter acquired in journey calculates TBM hob abrasion amount in real time.But this method is only applicable to uniform ground consisting of hard rock, does not consider
The influence to hob abrasion is converted on soft or hard stratum in compound stratum, therefore is not suitable for hob abrasion prediction in compound stratum and is asked
Topic.
Invention content
The present invention provides a kind of compound stratum shield hob abrasion amount side of determining for deficiencies of the prior art
Method determines compound stratum geological conditions by geological mapping, is constructed according to the linear relationship and early period of friction energy and wear extent
The tool changing data of collection establish hob abrasion prediction model, and calculating hobboing cutter in conjunction with shield parameter adds up wear extent, according to shield
The rated wear limit value of hobboing cutter determines tool change time and opens a position place, so as to fulfill reasonable arrangement open a position tool changing, reduce tool changing
The purpose of cost.
The present invention is to be achieved through the following technical solutions：
A kind of compound stratum shield hob abrasion amount determines method, the described method comprises the following steps：
The first step, the distribution of strata situation that tunnel plotted line curb line is determined by probing method and unconfined compression test and
The formation strength S on each stratum.
Preferably, in the first step, the probing method refers to：With heavy wall fetch earth equipment in construction area every 35m from ground
Table at earth drilling to 1.5 times of tunnel construction depth, analyzed and researched and determine construction area by rock core, sample ore to acquisition
Distribution of strata situation in domain.
Preferably, in the first step, the unconfined compression test refers to：By a diameter of 150mm, the cylinder of a height of 150mm
Shape test specimen be put into no lateral pressure without in confining pressure instrument, then apply vertical axial pressure to test specimen to it and destroy, obtain
Test specimen compression strength U.
Preferably, in the first step, the distribution of strata situation refers to：The depth of each stratum upper and lower interface along shield.
Preferably, in the first step, the formation strength S refers to：The test specimen compression strength obtained by unconfined compression test
U。
Second step, the shield parameter in collection work progress and formation parameter determine the Dynamic Amplification Factor n of hobboing cutter to be predictedd
And friction coefficient α.
Preferably, in second step, the shield parameter refers to：Shield thrust F that shield machine generates in the construction process,
Cutterhead rotating speed n, shield driving speed v and cutter head torque T and hobboing cutter to be predicted are to the distance r of cutter head center, the width of each ring
Spend l0。
It is highly preferred that the shield thrust F refers to：The normal thrust that shield machine applies in the construction process to face,
kN。
It is highly preferred that the face refers to the formation volumes cut in shield tunneling process by cutterhead.
It is highly preferred that the cutterhead rotating speed n refers to：Rotation of the shield machine engine in the construction process with movable knife disc rotation
Speed, rpm.
It is highly preferred that the shield driving speed v refers to：Shield machine advances in the construction process along tunnel piercing direction
Rate, mm/min.
It is highly preferred that the cutter head torque T refers to：In the construction process, driven by engine cutterhead is rotated and is produced shield machine
Raw torque, kNm.
Preferably, the hobboing cutter to be predicted refers to a certain hobboing cutter for needing to predict wear extent.
Preferably, in second step, the formation parameter refers to：Each ring is averaged stratum strength Si。
The stratum strength S it is highly preferred that each ring is averagediRefer to：The weighted average determined according to stratum distribution situation
Value is determined by formula (1)：
Wherein：SiRepresent the average value after the weighted calculation of stratum, MPa, wherein i represent ring number；SrRepresent softer in face
The intensity on stratum, MPa；SyIt represents in face compared with the intensity of hard formation, MPa；hrRepresent the interior thickness compared with soft formation of face,
m；hyIt represents in face compared with the thickness of hard formation, m；D represents face maximum height, m.
Preferably, in second step, the Dynamic Amplification Factor ndRefer to：Hobboing cutter is by the load that is hit during soft or hard bed boundary
The Dynamic Amplification Factor of influence is determined by formula (2)：
In formula：R represents hobboing cutter to be predicted to the distance of cutter head center, m；R represents cutter radius, m；Z represents soft, hard formation
Distance of the interface apart from face center, m.
Preferably, in second step, the friction coefficient α of the hobboing cutter and face can be true by formula (3) according to engineering experience
It is fixed：
In formula：F represents shield thrust, and S represents formation strength, and T represents cutter head torque.
Third step, determined according to shield-tunneling construction tool changing early period data friction energy add up wear extent Q to hobboing cutter between it is related
Coefficient k.
Preferably, in third step, the friction energy refers to：During shield-tunneling construction, hobboing cutter to be predicted rolls on face
Energy caused by dynamic friction.
Preferably, in third step, the hobboing cutter adds up wear extent Q, refers to：Hobboing cutter to be predicted is during face is cut
Cause the hobboing cutter amount of radially reducing caused by hobboing cutter spillage of material to be predicted, mm.
Preferably, in third step, the related coefficient k is determined by formula (4)：
In formula：L represent shield driving distance, that is, refer to shield machine in the construction process along tunnel piercing direction advance away from
From m.
4th step determines accumulative wear extent Q, and according to wear allowance Q according to prediction model and driving number of rings N0It determines to change
Knife opportunity.
Preferably, in the 4th step, the prediction model refers to：It is worn by the determining prediction that formula (3) and (4) are derived by
Measure QiFormula (5)：
In formula：Predict wear extent QiRefer to the wear extent of each ring of hobboing cutter determined according to prediction model, ground according to prediction
Damage amount and the specified wear allowance of hobboing cutter determine tool changing opportunity；l0Represent the width of each ring；αiRepresent the friction coefficient of each ring,
Wherein i represents ring number；FiRepresent the shield thrust of each ring, wherein i represents ring number；niRepresent the cutterhead rotating speed of each ring, wherein
I represents ring number.
Preferably, in the 4th step, the driving number of rings N refers to：Since hobboing cutter construction to need predict hob abrasion amount
The number of rings of period shield driving.
Preferably, in the 4th step, the tool changing opportunity refers to：Hobboing cutter adds up the over proof hob abrasion amounts of wear extent Q
Limit value Q0, i.e. Q ＞ Q0。
Preferably, in the 4th step, accumulative wear extent Q of the hobboing cutter in a construction period is determined by formula (6)：
Compared with prior art, the present invention has the advantages that：
The present invention is established according to friction energy and the tool changing data of the linear relationship of hob abrasion amount and construction collection early period
Hob abrasion prediction model calculates hobboing cutter in conjunction with shield parameter and adds up wear extent and hobboing cutter rated wear limit value, determines to close
Suitable tool changing opportunity and the place that opens a position, so as to fulfill reasonable arrangement open a position tool changing opportunity, reduce tool changing cost, shorten construction period
Purpose.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the hob abrasion area schematic of one embodiment of the invention；
Fig. 2 is the tunnel planning construction geologic map of one embodiment of the invention；
Fig. 3 is the Dynamic Amplification Factor coverage of one embodiment of the invention.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Embodiment：
In Subway Project is using shield construction.Shield-tunneling construction passes through during soft or hard compound stratum, has and repeatedly opens
Storehouse tool changing, hob abrasion are serious.Twice for tool changing section, to be illustrated before the engineering.
As shown in Figure 1-Figure 3, a kind of compound stratum shield hob abrasion amount determines method, and the method includes following steps
Suddenly：
The first step, the strata division situation that tunnel plotted line curb line is determined by probing method and unconfined compression test and
The formation strength S on each stratum.
In this step, the probing method refers to：With heavy wall fetch earth equipment in construction area every 35m from earth's surface to underground
At drilling to subway planning 1.5 times of buried depths of circuit, earth's surface absolute altitude is 1.12m, subway planning circuit buried depth 17.14m, therefore is drilled
Locate to buried depth absolute altitude -25m, sampling analysis distribution of strata situation.
Further, the subway planning circuit buried depth refers to depth of the tunnel central axes of planning construction apart from earth's surface.
In this step, the distribution of strata situation refers to：The depth of each stratum upper and lower interface along shield.As shown in Fig. 2,
It is followed successively by from top to bottom：First layer is dispersed with artificial plain fill；The second layer is dispersed with silty clay；Third layer is dispersed with Muddy Bottoms
Clay；4th layer is dispersed with coarse sand；Layer 5 is dispersed with migmatitic granite.
In this step, the unconfined compression test refers to：In the range of 0.6m cylindrical samples, in centre cut-off
The cylindrical samples of diameter 150mm, height 150mm are put into no confining pressure instrument and apply pressure to test specimen destruction, obtain each stratum
Formation strength S.
In this step, the formation strength S refers to：The maximum of intensity obtained by unconfined compression test.Due to subway
Circuit is planned only by coarse sand and two kinds of stratum of migmatitic granite, therefore only need the formation strength on both stratum, wherein：
The formation strength S of coarse sandrFor 180MPa, the formation strength S of migmatitic graniteyFor 400MPa.
Second step, the shield parameter in collection work progress and formation parameter determine the Dynamic Amplification Factor n of hobboing cutterdAnd it rubs
Wipe factor alpha.
In this step, the shield parameter refers to：Shield thrust F, the cutterhead rotating speed that shield machine generates in the construction process
N, shield driving speed v and cutter head torque T (in first tool changing section, F 30000kN, n 1.5rpm, v 2mm/min, T
For 3500kNm) and the distance r of hobboing cutter to be predicted to cutter head center be 3.8m, the width l of each ring0For 1.6m.
In this step, the formation parameter refers to：Each ring is averaged stratum strength Si.It is average in first tool changing section
Formation strength SiIt is determined by formula (1)：
In formula：SiRepresent the average value after the weighted calculation of stratum, MPa；SrIt represents the interior intensity compared with soft formation of face, is
180MPa；SyIt represents compared with the intensity of hard formation in face, is 400MPa；hrIt represents the interior thickness compared with soft formation of face, is
2.2m；hyIt represents compared with the thickness of hard formation in face, is 2.2m；D represents face maximum height, is 4.4m.
Further, the face refers to：The formation volumes cut in shield tunneling process by cutterhead.
In this step, as shown in figure 3, the Dynamic Amplification Factor ndRefer to：Hobboing cutter during soft or hard strata interface by being rushed
The amplification coefficient of load influence is hit, is determined by formula (2)：
In formula：R represents hobboing cutter to be predicted to the distance of cutter head center, and selected distance cutter head center distance r is the rolling of 3.8m
Knife is calculated；R represents that cutter radius is 4.4m；The distance that z represents soft, hard formation interface is apart from face center, z are
0m, at this time r ＞ z, then：
Preferably, in second step, the friction coefficient α of the hobboing cutter and face can be true by formula (3) according to engineering experience
It is fixed.
In formula：F represents shield thrust, and S represents formation strength, and T represents cutter head torque.
Third step, determined according to shield-tunneling construction tool changing early period data friction energy add up wear extent Q to hobboing cutter between it is related
Coefficient k.
In this step, the friction energy refers to that during shield-tunneling construction, hobboing cutter is on face caused by rolling friction
Energy.
In this step, the hobboing cutter adds up wear extent Q and refers to：Hobboing cutter causes hobboing cutter material in face working angles
The hobboing cutter amount of radially reducing caused by material loss.In first tool changing section, Q 20mm.
In this step, the k values are determined by formula (4)：
In formula：L refers to the distance that shield machine advances in the construction process along tunnel piercing direction, in first tool changing area
Between share 15 rings, l 25m.
Then：
4th step determines accumulative wear extent Q, and according to wear allowance Q according to prediction model and driving number of rings N0It determines more
Change the opportunity of hobboing cutter.
In this step, the opportunity for replacing hobboing cutter refers to：Hobboing cutter adds up the over proof hob abrasion limit values of wear extent Q
Q0, i.e. Q ＞ Q0；Specified hob abrasion limit value is 20mm, i.e., as Q ＞ 20mm, needs the tool changing that opens a position.
In this step, the prediction model refers to：It substitutes into above-mentioned steps and collects, can predict hobboing cutter after determining data
The formula (5) of wear extent：
In formula：QiRepresent prediction wear extent；l0Represent the width of each ring；αiRepresent the friction coefficient of each ring, wherein i
Represent ring number；FiRepresent the shield thrust of each ring, wherein i represents ring number；niRepresent the cutterhead rotating speed of each ring, wherein i is represented
Ring number.
In formula, the friction coefficient α of the hobboing cutter and face can be determined according to engineering experience by formula (3)：
In formula：The TiRepresent the cutter head torque of each ring, wherein i represents ring number.
16th ring hob abrasion amount is determined by the prediction model：
Wherein：F16For 35000kN, n16For 1.5rpm, r 3.8m, l0For 1.6m, k 2.27kN, v 2mm/min, S16
For 290MPa, T16For 3000kNm.Z is 0, determines ndIt is 4.45.
Further, the prediction wear extent refers to the wear extent of each ring of hobboing cutter determined according to prediction model, can root
According to estimating wear extent and hobboing cutter requirement determines tool changing opportunity.
It can similarly obtain：α17It is 1.277, α18It is 1.983, α19It is 1.358, α20It is 1.377, α21It is 1.490, α22For
1.358 α23It is 1.255；Q17For 2.15mm, Q18For 3.67mm, Q19For 2.67mm, Q20For 2.32mm, Q21For 2.79mm, Q22For
2.67mm Q23For 2.26mm.
In this step, the driving number of rings N refers to：From start shield to need predict hob abrasion amount during shield driving
Number of rings, refer in the case from 16 rings to 23 rings.
Accumulative wear extent Q of the hobboing cutter in a construction period is determined by formula (6)：
Then accumulative wear extent Q of the hobboing cutter in second tool changing section：
In summary, after the 23rd ring is constructed, Q ＞ Q0, need the tool changing that opens a position.
Compound stratum shield hob abrasion amount of the present invention determines method, can be according to friction energy and hob abrasion amount
Linear relationship and early period construction collect tool changing data establish hob abrasion prediction model, in conjunction with shield parameter calculate roll
Knife adds up wear extent and hobboing cutter rated wear limit value, determines suitable tool changing opportunity and the place that opens a position, so as to fulfill reasonable peace
Arrange storehouse tool changing, the purpose for reducing tool changing cost, shortening construction period.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned retouch
It states and is not considered as limitation of the present invention.After those skilled in the art have read the above, for the more of the present invention
Kind modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of compound stratum shield hob abrasion amount determines method, which is characterized in that described method includes following steps：
The first step, by the method for drilling and unconfined compression test, determine the distribution of strata situation of tunnel plotted line curb line and each
The formation strength S on stratum；
Second step, the shield parameter in collection work progress and formation parameter determine the Dynamic Amplification Factor n of hobboing cutter to be predicteddAnd it rubs
Wipe factor alpha；Wherein：
The Dynamic Amplification Factor ndRefer to hobboing cutter by soft or hard bed boundary when be hit load influence Dynamic Amplification Factor, by formula
(2) it determines：
In formula：R represents hobboing cutter to be predicted to the distance of cutter head center, m；R represents cutter radius, m；Z represents soft, hard formation boundary
Identity distance is with a distance from face center, m, and face refers to the stratum cut in shield tunneling process by cutterhead；
The friction coefficient α of the hobboing cutter and face is determined according to engineering experience by formula (3)：
In formula：F represents shield thrust, and S represents formation strength, and T represents cutter head torque；
Third step, according to shield-tunneling construction tool changing early period data, determine friction energy and hobboing cutter add up related coefficient between wear extent Q
k；K is determined by formula (4)：
In formula：α represents friction coefficient；ndRepresent Dynamic Amplification Factor；F represents shield thrust, kN；N represents cutterhead rotating speed, rpm；R is represented
Hobboing cutter to be predicted is to the distance of cutter head center, m；L represents shield driving distance, i.e., shield machine is in the construction process along tunnel digging
The distance advanced into direction, m；Q represent hobboing cutter to be predicted cause hobboing cutter spillage of material to be predicted during face is cut and
The caused hobboing cutter amount of radially reducing, mm；V represents shield driving speed, mm/min；
4th step determines accumulative wear extent Q, and according to wear allowance Q according to prediction model and driving number of rings N0When determining tool changing
Machine.
2. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that the first step
In, there is one or more of feature：
The probing method refers to：It is built in construction area every 35m from earth's surface to earth drilling to tunnel with the heavy wall equipment that fetches earth
If at 1.5 times of depth, rock core, sample ore to acquisition are analyzed and researched and determine the distribution of strata situation in construction area；
The unconfined compression test refers to：The cylinder specimen of a diameter of 150mm, a height of 150mm are put into no lateral pressure
Without in confining pressure instrument, then apply vertical axial pressure to test specimen to it and destroy, obtain test specimen compression strength U；
The distribution of strata situation refers to：The depth of each stratum upper and lower interface along shield；
The formation strength S refers to：The test specimen compression strength U obtained by unconfined compression test.
3. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that second step
In, the shield parameter refers to：Shield thrust F that shield machine generates in the construction process, cutterhead rotating speed n, shield driving speed v
With cutter head torque T and hobboing cutter to be predicted to the distance r of cutter head center, the width l of each ring0。
4. a kind of compound stratum shield hob abrasion amount according to claim 3 determines method, which is characterized in that have with
A kind of lower or various features：
The shield thrust F refers to：The normal thrust that shield machine applies in the construction process to face, kN；
The cutterhead rotating speed n refers to：Velocity of rotation of the shield machine engine in the construction process with movable knife disc rotation, rpm；
The shield driving speed v refers to：The rate that shield machine advances in the construction process along tunnel piercing direction, mm/
min；
The cutter head torque T refers to：In the construction process, driven by engine cutterhead rotates and the torque of generation, kN for shield machine
m。
5. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that second step
In, the formation parameter refers to：Each ring is averaged stratum strength Si, subscript i expression ring numbers.
6. a kind of compound stratum shield hob abrasion amount according to claim 5 determines method, which is characterized in that described every
One ring is averaged stratum strength SiRefer to：According to the weighted average that stratum distribution situation determines, determined by formula (1)：
Wherein：SiRepresent that each ring is averaged formation strength, MPa；SrIt represents in face compared with the intensity of soft formation, MPa；SyIt represents
Compared with the intensity of hard formation, MPa in face；hrIt represents in face compared with the thickness of soft formation, m；hyIt represents in face compared with hard place
The thickness of layer, m；D represents face maximum height, m.
7. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that third walks
In, the friction energy refers to：During shield-tunneling construction, hobboing cutter energy caused by rolling friction on face.
8. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that the 4th step
In, the prediction model refers to：The prediction wear extent Q being derived by by formula (3) and formula (4)iFormula (5)：
In formula：Predict wear extent QiRefer to the wear extent of each ring of hobboing cutter determined according to prediction model, according to prediction wear extent and
The specified wear allowance of hobboing cutter determines tool changing opportunity；l0Represent the width of each ring；αiRepresent the friction coefficient of each ring, FiIt represents
The shield thrust of each ring, niRepresent the cutterhead rotating speed of each ring, wherein i represents ring number.
9. a kind of compound stratum shield hob abrasion amount according to claim 1 determines method, which is characterized in that the 4th step
In, the driving number of rings N refers to：It is constructed since hobboing cutter to the number of rings for needing shield driving during prediction hob abrasion amount.
10. determining method according to a kind of compound stratum shield hob abrasion amount of claim 1-9 any one of them, feature exists
In the tool changing opportunity refers to：Hobboing cutter adds up the over proof hob abrasion amount limit value Q of wear extent Q0, i.e. Q ＞ Q0；
Accumulative wear extent Q of the hobboing cutter in a construction period is determined by formula (6)：
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110378069A (en) * | 2019-08-01 | 2019-10-25 | 南京坤拓土木工程科技有限公司 | A method of prediction boring machine cutter accumulated quality loss late |
| CN111626623A (en) * | 2020-05-29 | 2020-09-04 | 中铁二十局集团第五工程有限公司 | Method for controlling cutter changing of shield machine hob in composite stratum |
| CN113586028A (en) * | 2021-07-21 | 2021-11-02 | 宁夏天地奔牛实业集团有限公司 | Intelligent monitoring system of raise boring machine reaming cutter head based on digital twinning |
| CN114294000A (en) * | 2021-12-31 | 2022-04-08 | 广州轨道交通建设监理有限公司 | Replacement method and replacement equipment for hob of shield machine |
| CN114780906A (en) * | 2022-06-21 | 2022-07-22 | 北京城建集团有限责任公司 | Shield tool changing distance measuring and calculating method |
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| CN110378069A (en) * | 2019-08-01 | 2019-10-25 | 南京坤拓土木工程科技有限公司 | A method of prediction boring machine cutter accumulated quality loss late |
| CN110378069B (en) * | 2019-08-01 | 2020-07-03 | 南京坤拓土木工程科技有限公司 | Method for predicting accumulated mass loss rate of cutter of tunneling machine |
| CN111626623A (en) * | 2020-05-29 | 2020-09-04 | 中铁二十局集团第五工程有限公司 | Method for controlling cutter changing of shield machine hob in composite stratum |
| CN111626623B (en) * | 2020-05-29 | 2022-05-24 | 中铁二十局集团第五工程有限公司 | Cutter changing control method for hob of shield machine in composite stratum |
| CN113586028A (en) * | 2021-07-21 | 2021-11-02 | 宁夏天地奔牛实业集团有限公司 | Intelligent monitoring system of raise boring machine reaming cutter head based on digital twinning |
| CN113586028B (en) * | 2021-07-21 | 2024-03-29 | 太原理工大学 | Intelligent monitoring system of counter bore cutter head of anti-well drilling machine based on digital twin |
| CN114294000A (en) * | 2021-12-31 | 2022-04-08 | 广州轨道交通建设监理有限公司 | Replacement method and replacement equipment for hob of shield machine |
| CN114294000B (en) * | 2021-12-31 | 2024-01-26 | 广州轨道交通建设监理有限公司 | Method and equipment for replacing hob of shield machine |
| CN114780906A (en) * | 2022-06-21 | 2022-07-22 | 北京城建集团有限责任公司 | Shield tool changing distance measuring and calculating method |
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