CN111946350A - Construction method for rapidly repairing edge of shield cutter based on high-abrasion stratum - Google Patents
Construction method for rapidly repairing edge of shield cutter based on high-abrasion stratum Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- 238000005299 abrasion Methods 0.000 title claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 238000003466 welding Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 40
- 230000008439 repair process Effects 0.000 claims abstract description 39
- 230000005641 tunneling Effects 0.000 claims abstract description 22
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/08—Sinking shafts while moving the lining downwards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/02—Sinking shafts by hand
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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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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Abstract
The invention belongs to the technical field of shield cutter head edge repair, and discloses a shield cutter head edge rapid repair construction method based on a high-abrasion stratum, which comprises the steps of establishing shutdown mileage; construction procedure of working face; and D, repairing the edge of the cutter head. The construction scheme of the shaft operation surface of the manual hole digging pile and the small-radius steel casing is adopted for split welding and well descending and sleeve valve pipe grouting reinforcement, so that the safety and space requirements of the stratum construction are met; a multi-dimensional repair model selection scheme is made according to the abrasion condition of each cutter head, on-site blanking is carried out, a multi-layer and multi-channel welding method is combined, a gas shielded welding process which is the same as or similar to that in the original factory manufacturing process is selected, welding quality is strictly controlled, and the repair effect is guaranteed. The excavation of the working well in advance is synchronous with the shield tunneling, the next step of work can be linked after the halt mileage is reached, and the problem that the stratum repairing period is delayed due to the measures of halt reinforcement, in-tunnel repair auxiliary cavern expanding excavation, operation platform building and the like is solved.
Description
Technical Field
The invention belongs to the technical field of shield cutter head edge repair, and particularly relates to a shield cutter head edge rapid repair construction method based on a high-abrasion stratum.
Background
The cutter head is one of main parts of the shield machine, and the design of the cutter head can meet the requirement of deformation resistance under the general condition. With the development of urban construction, the shield machine excavates in the sandy gravel layer that contains boulder, the iron plate sand layer that the compactness is higher and other bad stratums and causes the phenomenon that blade disc, cutter are general to be worn away. The region of the cutter head close to the edge is easily highly abraded due to the influence of the superposition effects of uneven load, underground water impact and the like due to the long distance of a tunneling line, so that the tunneling speed of the shield tunneling machine is reduced, and even the shield tunneling machine cannot tunnel. In order to ensure the stability of an excavation surface, no other safety methods except the construction by using a conventional vertical shaft method are used for repairing, and the defects of complex process, long construction period, high cost and the like exist when the excavation supporting is repeatedly carried out by using the conventional vertical shaft method. The method is continuously researched in construction, and finally, the edge of the cutter head is repaired by adopting a miniature working well with a steel casing arranged in a manual hole digging pile. Practice proves that the method can finish the repair work of the shield cutter head in a high-quality, economic and rapid manner on the premise of ensuring the construction safety, and has remarkable economic and social benefits.
Through the above analysis, the problems and defects of the prior art are as follows: in the prior art, excavation and support are repeatedly carried out by adopting a conventional vertical shaft method after shutdown, the construction process is complex, the construction mode for repairing the edge of the cutter head is inflexible, a large amount of construction time is wasted, and the current common planning and coordination requirements are not met. In the prior art, weak blasting construction is generally adopted by adopting measures such as in-tunnel repair auxiliary cavern expanding excavation and operation platform construction, so that the safety is poor, and the method is not suitable for the unstable stratum of the surrounding rock. And the residue soil is required to be cleaned at any time, so that the construction period is delayed for a long time.
The difficulty in solving the above problems and defects is: in the prior art, the stability of the face at the position of hard rock is generally utilized to repair the edge wear of the cutter in the tunnel, so that the construction period is shortened, the replacement of the cutter or the cutter holder in a narrow space is feasible, and meanwhile, the fact that the edge wear of the cutter in the tunnel is required to be quickly repaired in a pebble layer of boulder, an iron plate sand layer with higher compactness and other strata with unstable face and higher abrasiveness is avoided. Thus, cutterhead edge restoration based on the above-described formation has been considered a worldwide problem to date. In order to ensure the stability of an excavation surface, no other safety methods except for the underground construction by using a conventional vertical shaft method are used for repairing, the conventional vertical shaft method generally needs to be stopped in advance and then excavated, and the conventional planning and coordination requirements are gradually not met. How to carry out all-round coordination on rapid wear repair of a cutterhead in a tunnel under the stratum condition becomes a difficult point for carrying out innovation on a construction method and a construction mode.
The significance of solving the problems and the defects is as follows: the stratum boundary of rapid restoration of cutter head edge wearing and tearing in the tunnel has been enlarged, compares the process of conventional shaft method excavation supporting, hole restoration auxiliary cavern expand digging and operation platform construction in the hole, adopts the miniature working well construction mode of artifical bored pile built-in steel casing, satisfies the construction safety requirement of this type of stratum. The working well is excavated in advance, and the shield tunneling machine is matched with the micro working face immediately after arriving to carry out cutterhead grid rotation repairing, so that a large amount of construction time is saved, and the problem that the excavation is not continuous caused by the fact that the traditional method is stopped firstly and then the working well is excavated to carry out repairing is solved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a shield cutter head edge rapid repairing construction method based on a high-abrasion stratum.
The invention is realized in such a way that a shield cutter edge rapid repair construction method based on a high-abrasion stratum comprises the following steps:
step one, establishing a stopping mileage, combining the current situation of abrasion, synchronizing shield tunneling and construction of a repair point of an operation surface, and starting repair after the construction is finished;
secondly, performing a working face construction procedure, namely manual hole digging pile construction, steel casing hoisting split welding, built-in micro well wall concrete pouring and grouting reinforcement of a grouting ring of an outer sleeve valve pipe of the well;
and thirdly, repairing the edge of the cutter head, controlling in the hole, rotating the cutter head in a grid division manner, controlling the soil discharge amount, blanking on site, cutting and welding and circularly operating.
Further, the current wear situation processing of the shield cutter head edge rapid repair construction method based on the high-abrasion stratum comprises the following steps: at steel pile casing inner wall welding cat ladder, the cat ladder adopts 14mm steel preparation, welds 4 location muscle along the cross direction outside steel pile casing kneck, and the steel pile casing adopts plain concrete backfill closely knit with artifical hole digging pile dado clearance, and steel pile casing components of a whole that can function independently welding and well descending adopt plain concrete backfill closely knit with artifical hole digging pile dado clearance, welds 4 location muscle along the cross direction outside the kneck.
And further, the first step comprises the steps of entering the soil bin according to the opening gap of the shield, then measuring the abrasion loss of a mobile abrasion detection device preset at the edge of the cutter head, and planning and determining the repair mileage of the edge of the cutter head by combining the conditions of shield tunneling speed, dewatering well construction progress and the like when the abrasion loss is close to 20 mm. (wear detecting means: a difference in the final length change, i.e. the amount of wear, which is removable by inserting the edge of the cutter head)
Further, the first step also comprises synchronous shield tunneling and operation surface construction, and the cutter head repairing work can be started after the shield tunneling machine reaches the stop mileage; and (3) chiseling plain concrete at the bottom of the vertical shaft by using an air pick to expose the cutter head and the shield body, and measuring the specific abrasion size after dust removal in the shaft is finished.
And furthermore, the second step comprises the steps of blanking according to the size, completing one part of repairing, dividing the box to rotate the cutter head, repairing the next part, dividing the cutter head into boxes to rotate to expose the outer ring abrasion area to the operation surface repairing position, and determining targeted multi-dimensional repairing selection and reasonable blanking according to the actual abrasion conditions of all parts.
Further, the third step also comprises cutting off the worn peripheral part of the cutter head, and removing the hob box, the scraper knife seat and the reinforcing rib plate worn in the edge area of the cutter head; and (4) carrying out flame cutting and finishing on the worn cutter head, and polishing the to-be-welded surface of the worn area to obtain metallic luster.
Further, selecting CO2Gas shielded welding and multilayer multi-pass welding.
Furthermore, after the third step, after operation in a high-abrasiveness stratum, the alloy wear-resistant blocks are distributed in the annular area of the outer ring of the cutter head, the parts with serious wear are replaced with new blocks, the surfaces of the parts with good wear but block shapes are subjected to repair-overlaying wear-resistant welding, and the grooves of the parts with wear on the side surfaces are welded with wear-resistant steel plates.
Further, after operation in a highly abrasive stratum, thick steel plates are added on three surfaces of the leaked wedge block and the C-shaped block, the height of the steel plate is larger than that of the existing wedge block or C-shaped block, the steel plate is attached to the side surface of the wedge block or C-shaped block in parallel, and the gap between the steel plate and the wedge block or the C-shaped block is 2 mm; and thick steel plates are added on three surfaces of the leaked wedge block and the C-shaped block, the height of each steel plate is larger than that of the existing wedge block or C-shaped block, the steel plates are attached to the side surfaces of the wedge block or C-shaped block in parallel, and the gap between the steel plates and the side surfaces of the wedge block or C-shaped block is 2 mm.
Further, after operation in a highly abrasive stratum, the thick steel plate added on the back of the scraper is lower than the alloy block at the edge of the scraper and is close to the back of the scraper; the width of the steel plate is more than 50mm, the welding seams at the periphery are fully welded, the bottom of the steel plate block needs to be beveled, bevel welding is adopted, the bevel is more than 15mm, and the surface and the side surface of the steel plate block are subjected to parallel surfacing and abrasion-resistant welding in advance; and simultaneously, the thick steel plate is cut into more than 3 blocks, the transverse gaps of the steel plate blocks are welded and piled up, the longitudinal welding seams are integrally connected, and the piling height is more than 30mm, and the width is more than 30 mm.
By combining all the technical schemes, the invention has the advantages and positive effects that: the construction scheme of the shaft operation surface of the manual hole digging pile and the small-radius steel casing is adopted for split welding and well descending and sleeve valve pipe grouting reinforcement, so that the safety and space requirements of the stratum construction are met; a multi-dimensional repair model selection scheme is made according to the abrasion condition of each cutter head, on-site blanking is carried out, a multi-layer and multi-channel welding method is combined, a gas shielded welding process which is the same as or similar to that in the original factory manufacturing process is selected, welding quality is strictly controlled, and the repair effect is guaranteed. The excavation of the working well in advance is synchronous with the shield tunneling, the next step of work can be linked after the halt mileage is reached, and the problem that the stratum repairing period is delayed due to the measures of halt reinforcement, in-tunnel repair auxiliary cavern expanding excavation, operation platform building and the like is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a flow chart of a shield cutterhead edge rapid repairing construction method based on a high-abrasion stratum provided by the embodiment of the invention.
Fig. 2 is a schematic view of an overall structure of a working plane according to an embodiment of the present invention.
FIG. 3 is a drawing of a steel casing according to an embodiment of the present invention.
Fig. 4 is a schematic view of a cutter head edge repair area provided by an embodiment of the invention.
Fig. 5 is a schematic view of the tool and the cutter head edge wear measurement provided by the embodiment of the invention.
Fig. 6 is a real view of a shield arrival working plane provided by an embodiment of the present invention.
Fig. 7 is a real view of a cutterhead edge repairing process provided by the embodiment of the invention.
Fig. 8 is a schematic diagram of an alloy wear-resistant block of a repaired cutterhead outer ring provided by the embodiment of the invention.
Fig. 9 is a schematic diagram of a repaired edge hob and a hob box according to an embodiment of the present invention.
Fig. 10 is a schematic view of a doctor blade repairing process provided by an embodiment of the invention.
Fig. 11 is a schematic diagram of a rock breaking model provided in an embodiment of the present invention.
FIG. 12 is a schematic diagram of a comparison between a predicted calculated value and an actual engineering value of the wear of a hob according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a shield cutter head edge rapid repair construction method based on a high-abrasion stratum, and the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the method for rapidly repairing the edge of the shield cutterhead based on the high-abrasion stratum provided by the invention comprises the following steps:
s101: establishing a stopping mileage, combining the current wear situation, synchronizing shield tunneling and construction of a repair point of an operation surface, and immediately starting repair work after the shield tunneling and the repair point arrive;
s102: construction procedures of an operation surface, precipitation well construction, manual hole digging pile construction, split welding of a small-radius built-in steel casing, well descending and grouting reinforcement of shaft sleeve valve pipes;
s103: repairing the edge of the cutter head, controlling in the hole, dividing the cutter head into grids, controlling the soil output, blanking on site, cutting and welding, and circulating.
The technical solution of the present invention is further described below with reference to the accompanying drawings.
Taking Chengdu subway engineering as an example, the diameter of a bored pile is 1.4m, the diameter of a steel pile casing is 1.2m, the thickness of the steel pile casing is 10mm, the length of a single-section cylinder is 3m, a ladder stand is welded on the inner wall of the cylinder as required, and the ladder stand is made of 14mm steel. And 4 positioning ribs are welded outside the joint of the steel casing along the cross direction. And the gap between the steel pile casing and the retaining wall of the manual hole digging pile is densely backfilled by plain concrete. And (3) separately welding the steel casing and putting the steel casing into the well, and backfilling and compacting the gap between the steel casing and the retaining wall of the manual hole digging pile by using plain concrete. Welding a ladder stand on the inner wall of the steel casing according to requirements, and welding 4 positioning ribs outside the joint along the cross direction. As shown in fig. 2 and 3.
The repair tasks include: A. welding (repairing) a wear-resistant steel plate in a wear area of the outer ring of the cutter head; B. replacing wear-resistant alloy blocks in the wear area of the outer ring of the cutter head; C. replacing the edge hob and replacing an edge hob box; D. replacing the edge scraper and replacing the edge scraper seat; the size after repair is required to be consistent with the original design size, and the like. As shown in fig. 4.
And predicting the future cutter disc abrasion loss according to methods such as shield interval bin opening cutter changing abrasion loss measurement, abrasion detection point numerical value feedback and the like, and repairing the cutter disc edge at the planned mileage by combining the construction condition of the front dewatering well. As shown in fig. 5.
The shield tunneling and the working face construction are synchronized, the cutter head repairing work can be started after the shield tunneling machine reaches the stopping mileage, compared with the traditional method that the shield tunneling machine is stopped firstly and then a working well is excavated, a large amount of construction time is saved, and the requirements on planning, coordination and safety are met. And (3) chiseling plain concrete at the bottom of the vertical shaft by using an air pick to expose the cutter head and the shield body, and after dust removal in the shaft is finished, descending the shaft by an engineer to measure the specific abrasion size. As shown in fig. 6.
And (5) blanking by ground maintenance personnel according to the size. And after one part is repaired, the cutter head is rotated in a grid division mode, and then the next part is repaired. The cutter head is divided into grids, an outer ring abrasion area is exposed to the operation surface repairing position in a rotating mode, the targeted multidimensional repairing selection is determined according to the actual abrasion conditions of all parts, reasonable blanking is achieved, the whole process has strong continuity, and meanwhile the problems that a large amount of material cost is wasted in the previous repairing process and the later effect is poor are solved.
Cutting off the worn peripheral part of the cutter head, and simultaneously removing the worn hob box, the worn scraper knife seat and the worn reinforcing rib plate in the edge area of the cutter head; and (4) carrying out flame cutting and finishing on the worn cutter head, and polishing the to-be-welded surface of the worn area to obtain metallic luster. In order to ensure the later application efficiency, a multilayer multi-pass welding method is adopted, and a cutter in the original factory is selectedCO identical or similar in disc manufacture2And (3) a gas shielded welding process. As shown in fig. 7.
After operation in a highly abrasive stratum, alloy wear-resistant blocks are annularly distributed in the outer ring area of the cutter head, the parts with serious wear are immediately replaced with new blocks, the surfaces of the parts with good block types are subjected to build-up wear-resistant welding, and the side surfaces of the parts with good wear are subjected to groove welding of wear-resistant steel plates. And performing targeted process selection on the positions of the second wear-resistant ring, the edge cutter box and the cutter holder. As shown in fig. 8.
After operation in a highly abrasive stratum, the shield hob box of the shield hob is seriously worn, and installation wedge blocks and C-shaped blocks of the hob leak and are unprotected. And thick steel plates are added on three surfaces of the leaked wedge block and the C-shaped block, the height of each steel plate is larger than that of the existing wedge block or C-shaped block, the steel plates are attached to the side surfaces of the wedge block or C-shaped block in parallel, and the gap between the steel plates and the side surfaces of the wedge block or C-shaped block is 2 mm. And thick steel plates are added on three surfaces of the leaked wedge block and the C-shaped block, the height of each steel plate is larger than that of the existing wedge block or C-shaped block, the steel plates are attached to the side surfaces of the wedge block or C-shaped block in parallel, and the gap between the steel plates and the side surfaces of the wedge block or C-shaped block is 2 mm. As shown in fig. 9.
After the scraper operates in a highly abrasive stratum, the abrasion of a scraper blade holder is serious, the scraper leaks outside and is not protected by the blade holder, and the thick steel plate added to the back of the scraper is lower than the alloy block at the edge of the scraper and is close to the back of the scraper. The width of the steel plate is more than 50mm, and the welding seams at the periphery are fully welded. And (3) beveling the bottom of the steel plate block by adopting bevel welding, wherein the bevel is larger than 15 mm. The surface and the side surface of the steel plate are subjected to parallel surfacing and wear-resistant welding in advance. Meanwhile, the surface of the cutter disc at the back of the scraper is of an arc-shaped structure, so that a thick steel plate can be cut into more than 3 blocks to be convenient for attaching a wear surface, all welding seams must be connected, the transverse gaps of the steel plate blocks are welded and piled up flatly, the longitudinal welding seams are integrally connected, and the piling height is more than 30mm, and the width is more than 30 mm. As shown in fig. 10.
The technical effects of the present invention will be described in detail with reference to experiments.
Under the basis of comprehensively analyzing four wear mechanisms such as abrasive wear, adhesive wear, fatigue wear and impact wear of the hob in the highly abrasive stratum, a hob radial wear amount calculation model under different wear mechanisms is deduced. The hob CSM model is utilized to analyze the stress of the hob, and the hob total wear prediction model is provided by combining four wear mechanisms, and application practices prove that the prediction model has good adaptability to high-abrasive strata such as sand pebbles, boulders and the like, as shown in FIGS. 11 and 12.
The research on cutter abrasion and service life prediction of a sandy gravel stratum is less, and the cutter changing time can be accurately mastered through a hob abrasion loss prediction model provided by the research, so that the economic loss caused by excessive hob abrasion or replacement of a hob in advance is avoided. Through extension exploration, the model is found to have certain related regularity in prediction of the edge wear of the cutter head, and plays a certain auxiliary role in preventing excessive wear of the cutter head edge and repairing effects of the cutter head edge in the tunneling stage.
The comprehensive cutter optimization design, the cutter edge rapid repairing technology based on the high-abrasiveness stratum, the clamping stop prevention and control technology, the escaping technology and the like form a multi-insurance combined innovation scheme, so that 2 times of cutter changing and 12 times of stone taking are averagely reduced. Shield consumables, electricity charges, mechanical depreciation charges, turnover material use charges and labor charges are greatly reduced.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A shield cutter head edge rapid repairing construction method based on a high-abrasion stratum is characterized by comprising the following steps:
step one, establishing a stopping mileage, combining the current situation of abrasion, synchronizing shield tunneling and construction of a repair point of an operation surface, and starting repair after the construction is finished;
secondly, performing construction procedures on an operation surface, namely dewatering well construction, manual hole digging pile construction, split welding of a small-radius built-in steel casing, well descending and grouting reinforcement of a shaft sleeve valve pipe;
and thirdly, repairing the edge of the cutter head, controlling in the hole, rotating the cutter head in a grid division manner, controlling the soil discharge amount, blanking on site, cutting and welding and circularly operating.
2. The method for rapid repairing construction of shield cutter head edge based on high abrasion stratum according to claim 1, wherein the current wear situation processing of the method for rapid repairing construction of shield cutter head edge based on high abrasion stratum comprises: at steel pile casing inner wall welding cat ladder, the cat ladder adopts 14mm steel preparation, welds 4 location muscle along the cross direction outside steel pile casing kneck, and the steel pile casing adopts plain concrete backfill closely knit with artifical hole digging pile dado clearance, and steel pile casing components of a whole that can function independently welding and well descending adopt plain concrete backfill closely knit with artifical hole digging pile dado clearance, welds 4 location muscle along the cross direction outside the kneck.
3. The shield cutterhead edge rapid repair construction method based on the high-abrasion stratum according to claim 1, characterized in that the first step further comprises measuring future cutterhead wear amount according to shield zone opening cutter changing wear amount measurement and wear detection point numerical value feedback method, and repairing the cutterhead edge at planned mileage in combination with construction conditions of a preceding dewatering well.
4. The method for shield cutterhead edge quick repair construction based on high abrasion stratum according to claim 3, characterized in that the first step further comprises synchronous shield tunneling and working face construction, and cutterhead repair work can be started after the shield machine reaches the stop mileage; and (3) chiseling plain concrete at the bottom of the vertical shaft by using an air pick to expose the cutter head and the shield body, and measuring the specific abrasion size after dust removal in the shaft is finished.
5. The shield tunneling cutter edge rapid repair construction method based on the high-abrasion stratum according to claim 1, wherein the second step further comprises blanking according to size, completing one repair, dividing and rotating the cutter, repairing the next, dividing and rotating the cutter to expose the outer ring abrasion area to the operation surface repair position, and determining targeted multi-dimensional repair selection and reasonable blanking according to actual abrasion conditions of all parts.
6. The shield tunneling machine cutter head edge rapid repair construction method based on the high-abrasion stratum according to claim 3, wherein the third step further comprises cutting off the worn outer peripheral part of the cutter head, and simultaneously removing the hob box, the scraper cutter seat and the reinforcing rib plate worn in the edge area of the cutter head; and (4) carrying out flame cutting and finishing on the worn cutter head, and polishing the to-be-welded surface of the worn area to obtain metallic luster.
7. The method of claim 6, wherein CO is selected for rapid repair of the edge of the shield cutterhead based on the high abrasion stratum2The gas shielded welding process comprises multilayer and multi-pass welding.
8. The method for rapidly repairing the edge of the shield cutterhead based on the high-abrasion stratum according to claim 1, wherein after the third step, after operation in the high-abrasion stratum, the alloy abrasion-resistant blocks are distributed in the outer ring area of the cutterhead in an annular mode, the abrasion-resistant blocks are replaced by new abrasion-resistant blocks, the abrasion-resistant blocks are subjected to surface build-up abrasion-resistant welding when the abrasion-resistant blocks are abraded but the block type is intact, and the abrasion-resistant steel plates are subjected to groove welding at the side abrasion-resistant parts.
9. The shield tunneling cutter edge rapid repair construction method based on the high-abrasion stratum as claimed in claim 8, characterized in that after operation in the high-abrasion stratum, thick steel plates are added on three sides of the outer leaked wedge block and C-shaped block, the height of the steel plate is greater than that of the existing wedge block or C-shaped block, the steel plate is attached to the side face of the wedge block or C-shaped block in parallel, and the gap between the steel plate and the wedge block or C-shaped block is 2 mm; and thick steel plates are added on three surfaces of the leaked wedge block and the C-shaped block, the height of each steel plate is larger than that of the existing wedge block or C-shaped block, the steel plates are attached to the side surfaces of the wedge block or C-shaped block in parallel, and the gap between the steel plates and the side surfaces of the wedge block or C-shaped block is 2 mm.
10. The shield cutterhead edge rapid repair construction method based on the high-abrasion stratum as claimed in claim 8, characterized in that after the operation in the high-abrasion stratum, the thick steel plate block is added on the back of the scraper, the height of the thick steel plate block is lower than the position of the alloy block on the edge of the scraper, and the thick steel plate block is close to the back of the scraper; the width of the steel plate is more than 50mm, the welding seams at the periphery are fully welded, the bottom of the steel plate block needs to be beveled, bevel welding is adopted, the bevel is more than 15mm, and the surface and the side surface of the steel plate block are subjected to parallel surfacing and abrasion-resistant welding in advance; and simultaneously, the thick steel plate is cut into more than 3 blocks, the transverse gaps of the steel plate blocks are welded and piled up, the longitudinal welding seams are integrally connected, and the piling height is more than 30mm, and the width is more than 30 mm.
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| CN202010808275.3A CN111946350A (en) | 2020-08-12 | 2020-08-12 | Construction method for rapidly repairing edge of shield cutter based on high-abrasion stratum |
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| CN202010808275.3A CN111946350A (en) | 2020-08-12 | 2020-08-12 | Construction method for rapidly repairing edge of shield cutter based on high-abrasion stratum |
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