CN117283232A - Repair method of shield scraper in limited space - Google Patents
Repair method of shield scraper in limited space Download PDFInfo
- Publication number
- CN117283232A CN117283232A CN202311357788.7A CN202311357788A CN117283232A CN 117283232 A CN117283232 A CN 117283232A CN 202311357788 A CN202311357788 A CN 202311357788A CN 117283232 A CN117283232 A CN 117283232A
- Authority
- CN
- China
- Prior art keywords
- scraper
- shield
- welding
- repairing
- block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 65
- 239000002689 soil Substances 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000009966 trimming Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 claims description 5
- 239000000956 alloy Substances 0.000 abstract description 11
- 229910045601 alloy Inorganic materials 0.000 abstract description 11
- 230000005641 tunneling Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000830536 Tripterygium wilfordii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 235000015398 thunder god vine Nutrition 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for repairing a shield scraper in a limited space, which comprises the following steps: providing a repairing block, wherein the repairing block is formed by processing a wear-resisting plate, the shape of the repairing block is matched with the shape of a row of cutter teeth of a scraper on a cutter head of a shield, and a plurality of rivet welding through grooves are formed in the bottom of the repairing block; clearing the peripheral frozen soil of the scraper at the upper opening of the cutterhead and the outer side of the opening through a shield cabin; trimming tooth grooves of the scraper; arranging the repair block in the trimmed tooth groove, so that a reserved welding joint is formed between the bottom of the repair block and the tooth groove, and the rivet welding through groove is arranged towards the opening; and welding in the reserved welding joint and the rivet welding through groove, so that the repair block is fixedly arranged in the tooth groove. The invention solves the problem of low shield tunneling construction efficiency caused by the fact that the scraper can not be dismantled due to the influence of special factors after all scraper alloy teeth on the shield cutterhead fall or are worn.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a method for repairing a shield scraper in a limited space.
Background
With the widespread use of shield methods in China, cutter wear has become a key problem affecting engineering quality and progress. The shield tunneling in the composite stratum generally adopts a composite cutter head and adopts a scheme of a hob cutter and a scraper cutter. The scraper is used as one of cutters for the shield tunneling machine, and is used for directly colliding with a stratum to dig, so that when a face is loose, broken and high in strength, the scraper directly contacts with rock, alloy teeth can be broken directly under the rotation of a cutter head, or when the face is broken, the alloy teeth of the scraper are broken directly by the rock which is not broken by a hob and falls greatly. After the scraper is damaged, the shield is pushed into a soft soil layer, the scraper cannot cut normally, and the shield tunneling construction efficiency is affected.
Under the special environments such as freezing, the scraper bolts cannot be removed due to the influence of special factors such as space, environment and the like, so that the shield tunneling construction efficiency is low.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, a repair method of a shield scraper in a limited space is provided, so that the problem that the shield tunneling construction efficiency is low because the scraper can not be dismantled due to the influence of special factors after all scraper alloy teeth on a shield cutter head fall or are worn is solved.
In order to achieve the above purpose, a method for repairing a shield scraper in a limited space is provided, which comprises the following steps:
providing a repairing block, wherein the repairing block is formed by processing a wear-resisting plate, the shape of the repairing block is matched with the shape of a row of cutter teeth of a scraper on a cutter head of a shield, and a plurality of rivet welding through grooves are formed in the bottom of the repairing block;
clearing the peripheral frozen soil of the scraper at the upper opening of the cutterhead and the outer side of the opening through a shield cabin;
trimming tooth grooves of the scraper;
arranging the repair block in the trimmed tooth groove, so that a reserved welding joint is formed between the bottom of the repair block and the tooth groove, and the rivet welding through groove is arranged towards the opening;
and welding in the reserved welding joint and the rivet welding through groove, so that the repair block is fixedly arranged in the tooth groove.
Further, the wear-resistant plate is a Hardox wear-resistant steel plate.
And further, when the welding step is carried out in the reserved welding joint and the rivet welding through groove, the outer side face of the repairing block is fully welded with the abrasion-resistant welding layer.
Further, the thickness of the abrasion resistant welding layer is more than or equal to 5mm.
Further, when finishing the tooth groove of the scraper, removing residual teeth in the tooth groove and polishing the groove wall of the tooth groove to be smooth.
The method for repairing the shield scraper in the limited space has the beneficial effects that the abrasion-resistant steel plate is processed into the shape of the scraper teeth, the whole is used for replacing the scraper alloy teeth to cut soil, and the scraper can be quickly and efficiently repaired under the condition that the scraper can not be integrally disassembled under the limited space and special environmental factors. On the other hand, a rivet welding through groove is formed in the bottom of the repair block and used for rivet welding, and the connection force between the repair block and the scraper is enhanced. The reserved welding joint at the bottom of the repairing block between the tooth grooves is opened towards the cutter disc so as to facilitate subsequent welding.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 is a schematic structural diagram of a shield scraper in a limited space according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a shield doctor blade in a confined space in accordance with an embodiment of the invention.
Fig. 3 is a schematic diagram of a state before the shield scraper is damaged in a limited space according to an embodiment of the present invention.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the invention are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1 and 2, the invention provides a method for repairing a shield scraper in a limited space, which comprises the following steps:
s1, providing a repairing block 2, wherein the repairing block 2 is formed by processing a wear-resisting plate, the repairing block 2 is matched with the shape of a row of cutter teeth of a scraper 1 on a cutter head of a shield, and a plurality of rivet welding through grooves 200 are formed in the bottom of the repairing block 2.
Referring to fig. 3, five teeth 3 are mounted on the side of the blade 1 facing the opening of the cutterhead. The cutter teeth are alloy blocks. After the five alloy block cutter teeth are crashed or damaged, the scraper cannot be integrally dismantled due to the influence of special factors such as space, environment and the like in the shield cabin in the tunnel, so that all the alloy cutter teeth of the scraper are integrally replaced by a repairing block processed by the wear-resisting plate.
In this embodiment, the length of the repair block is adapted to the length of five alloy cutter teeth, and the width of the repair block is adapted to the width of the alloy cutter teeth.
The bottom of the repair block is provided with a rivet welding through groove with a semicircular cross section. Welding reinforcing ribs 21 are formed in the through grooves.
S2, cleaning the opening on the cutterhead and the peripheral frozen soil of the scraper 1 outside the opening through the shield bin.
And cleaning the cutter head opening and frozen soil or mud around the scraper in the shield cabin, and cleaning the surfaces of cutter teeth of the scraper.
S3, trimming tooth grooves of the scraper 1.
Specifically, when the tooth groove of the scraper 1 is trimmed, the residual teeth in the tooth groove are removed, and the groove wall of the tooth groove is polished and leveled.
S4, arranging the repairing block 2 in the trimmed tooth groove, so that a reserved welding joint 20 is formed between the bottom of the repairing block 2 and the tooth groove, and the rivet welding through groove 200 is arranged towards the opening.
The repair block is positioned in the tooth groove of the scraper, a reserved welding joint 20 is formed between the bottom of the repair block 2 and the tooth groove, and the rivet welding through groove 200 is arranged towards the opening.
And S5, welding in the reserved welding joint 20 and the rivet welding through groove 200, so that the repairing block 2 is fixedly arranged in the tooth groove.
The wear-resistant plate is a Hardox (Handa steel) wear-resistant steel plate.
When the welding step is performed in the reserved welding joint 20 and the rivet welding through groove 200, the outer side surface of the repair block 2 is fully welded with the abrasion resistant layer. The thickness of the wear-resistant welding layer is more than or equal to 5mm.
During welding, all the scrapers with teeth falling off polish the groove walls of the tooth grooves to be smooth, and then the repairing blocks formed by processing the Hardox wear-resistant steel plates are fully welded at the root parts and a welding nail process is adopted in the rivet welding through groove.
The welding is preferably made of a tungsten carbide welding wire of Tripterygium wilfordii LQ707 (secondly MF586 high chromium welding wire)
The diameter of the welding wire is 1.6mm, the current of the welding machine is 230-280A, the welding voltage is 26-28V, the wire feeding speed of the welding machine is 6-8mm/min, and the welding speed is kept 120-135mm/min.
The repair scheme of the repair method of the shield scraper in the limited space is simple, the cost is low, the operation is easy, the repair method can be completed by a technician with welding experience, the tooth-falling scraper can be protected, and the cutting effect is ensured.
According to the repair method of the shield scraper in the limited space, the wear-resistant steel plate is processed into the shape of the scraper teeth, the whole is used for replacing the scraper alloy teeth to cut soil, the bottom of the repair block is provided with the rivet welding through groove for rivet welding, and the connection force between the repair block and the scraper is enhanced. The reserved welding seam between the tooth grooves at the bottom of the repairing block faces the cutter head opening, so that subsequent welding is facilitated, the welding seam and the rivet welding are minimum in size and meet the minimum size of the welding gun head, and the wear-resistant welding wire is selected, so that the wear resistance of the welding surface is improved.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (5)
1. The repair method of the shield scraper in the limited space is characterized by comprising the following steps of:
providing a repairing block, wherein the repairing block is formed by processing a wear-resisting plate, the shape of the repairing block is matched with the shape of a row of cutter teeth of a scraper on a cutter head of a shield, and a plurality of rivet welding through grooves are formed in the bottom of the repairing block;
clearing the peripheral frozen soil of the scraper at the upper opening of the cutterhead and the outer side of the opening through a shield cabin;
trimming tooth grooves of the scraper;
arranging the repair block in the trimmed tooth groove, so that a reserved welding joint is formed between the bottom of the repair block and the tooth groove, and the rivet welding through groove is arranged towards the opening;
and welding in the reserved welding joint and the rivet welding through groove, so that the repair block is fixedly arranged in the tooth groove.
2. The method for repairing a shield scraper in a limited space according to claim 1, wherein the wear-resistant plate is a Hardox wear-resistant steel plate.
3. The method for repairing a shield scraper in a limited space according to claim 1, wherein the outer side surface of the repair block is fully welded with a wear-resistant layer when the welding step is performed in the reserved welding joint and the rivet welding through groove.
4. The method for repairing a shield scraper in a limited space according to claim 3, wherein the thickness of the abrasion resistant layer is 5mm or more.
5. The method for repairing a shield cutter in a limited space according to claim 1, wherein when finishing the tooth slot of the cutter is performed, the residual teeth in the tooth slot are removed and the slot wall of the tooth slot is polished to be flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311357788.7A CN117283232A (en) | 2023-10-19 | 2023-10-19 | Repair method of shield scraper in limited space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311357788.7A CN117283232A (en) | 2023-10-19 | 2023-10-19 | Repair method of shield scraper in limited space |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117283232A true CN117283232A (en) | 2023-12-26 |
Family
ID=89257168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311357788.7A Pending CN117283232A (en) | 2023-10-19 | 2023-10-19 | Repair method of shield scraper in limited space |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117283232A (en) |
-
2023
- 2023-10-19 CN CN202311357788.7A patent/CN117283232A/en active Pending
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