CN103670429B - A kind of shield structure directly cuts the knife disc tool Enhancement Method of steel bar concrete pile - Google Patents
A kind of shield structure directly cuts the knife disc tool Enhancement Method of steel bar concrete pile Download PDFInfo
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- CN103670429B CN103670429B CN201310629364.1A CN201310629364A CN103670429B CN 103670429 B CN103670429 B CN 103670429B CN 201310629364 A CN201310629364 A CN 201310629364A CN 103670429 B CN103670429 B CN 103670429B
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Abstract
The invention belongs to city underground shield tunnel construction technology field, particularly relate to the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile.The implementation step of the method comprises: cutterhead nondestructive inspection; Strengthen cutterhead rigidity; Transformation center cutter; Increase anxious stake cutter in joining; Increasing is joined front and is cut a cutter; Increase cobordant edge and cut a cutter; Strengthen cutterhead abrasion resistance.The present invention can strengthen cutterhead rigidity and abrasion resistance, and what strengthen center cutter region cuts an ability, strengthens the deposit cutting power of cutter, thus reduces the risk that shield structure directly cuts steel bar concrete pile, ensures the smooth enforcement of cutting stake work.
Description
Technical field
The invention belongs to city underground shield tunnel construction technology field, particularly relate to the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile.
Background technology
Shield construction has safety due to it, fast, causes that stratum settlement is little, mechanization degree advantages of higher, is widely used in each metropolitan urban rail transit construction of China.Along with the encryption gradually of Metro Network, when urban central zone builds shield tunnel, be more and more difficult to invariably meet with the underground obstacles such as steel bar concrete pile.Because shield machine is when dispatching from the factory design, the general problem not considering Cutting Steel reinforced concrete obstruction, therefore the knife disc tool of conventional shield machine does not possess the ability of directly cutting steel bar concrete pile substantially, therefore, the outer engineering circles process pile foundation obstruction of Present Domestic, cuts a hole the conventional methods such as stake after pile pulling after artificial section stake after generally taking pile foundation underpinning, dismounting superstructure, excavating shaft and removes obstacle pile in advance.
Along with the development of shield technique, on the basis that existing knife disc tool transformation is strengthened, China has also occurred that several shield structures directly cut the Engineering Projects of stake in recent years, such as, Shanghai Underground No. ten line shield structures increase joins 1 cover dual-pilot cutter and 6 cutting 33 400mm × 400mm precast square piles after shell cutter, cut 10 350mm × 350mm stand column pile after 65 dual-pilot cutters are joined in Shanghai Underground No. seven line shield structures increasings, after 9 periphery hobboing cutters are joined in Hangzhou Subway line shield structure increasing, cut three row Φ 1000 castinplace piles.
Compared to conventional method, shield structure is directly cut stake and is had and affect the advantages such as surrounding enviroment are little, cost is low, the duration is short, society and remarkable in economical benefits.
Steel bar concrete pile situation is cut for shield structure, the existing knife disc tool transformation of analysis and summary adds strong method, find to there are following three problems: one, just increasing has been joined and has been cut a cutter, the rigidity of cutterhead and abrasion resistance are not strengthened, and cutterhead is as the carrier of cutter, once its occur large deformation, be worn through the phenomenons such as even disintegration, consequence is catastrophic; Two, do not strengthen an ability of cutting in cutter head center cutter region, in this case, be difficult on the one hand cut in the middle part of pile foundation, center cutter very easily causes cutter head center region mud lining after serious wear on the other hand; Three, when cutting large diameter pile foundation, cutter enhancement measures is more weak, and safety factor is lower, and risk is high.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile, strengthen cutterhead rigidity and abrasion resistance, what enhance center cutter region cuts an ability, and strengthen the deposit cutting power of cutter, thus reduce the risk that shield structure directly cuts steel bar concrete pile, ensure the smooth enforcement of cutting stake work.
For solving the problems of the technologies described above, the technical solution adopted in the present invention comprises the following steps:
Step 1): cutterhead nondestructive inspection:
The existing cutterhead of nondestructive inspection, checks whether existing defects situation, if detect cutterhead existing defects situation, first repairs cutterhead;
Step 2): strengthen cutterhead rigidity:
Weld deep floor at the spoke of existing cutterhead with between spoke, weld 2 ~ 3 circles from the inside to the outside altogether, deep floor interval 0.8 ~ 1.3m, single deep floor thickness is not less than 4cm;
Step 3): transformation center cutter:
Reduce the height of center cutter, the height of improved center cutter is 60% ~ 70% of original height, increases the thickness of center cutter;
Step 4): increase anxious stake cutter in joining:
Improved center cutter increases anxious stake cutter in joining, in anxious stake cutter adopt the mode of shell cutter type, one side blade, be fixed on center cutter by the mode of welding; In the blade width of anxious stake cutter be not more than step 3) in center cutter increase after thickness;
Step 5): increasing is joined front and is cut a cutter:
In the scope of cutterhead front surface region and Tool in Cutting radius 0.6 ~ 3.17m, increased by the mode of welding and join front and cut a cutter, the every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m cuts a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m cuts a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m cuts a cutter front;
Front is cut a cutter and is adopted shell cutter type, and alloy blade adopts the mode of double-sided blade, and tool point angle is taken as 90 degree; The blade height that a cutter is cut in front exceedes common more than scraper 6cm;
Step 6): increase cobordant edge and cut a cutter:
At the arrangement of cutterhead fringe region according to equiphase angle, arrange that 6 cut a cutter (6) edge by the mode of welding, the phase angle difference that neighboring edge cuts a cutter (6) is 60 degree; Edge is cut a cutter and is adopted shell cutter type, and alloy blade adopts the mode of one side sword; The blade of a cutter is cut to cutterhead outer incline in edge, and the blade tilt quantity i.e. amount of backbreaking is 15 ~ 20mm;
Step 7): strengthen cutterhead abrasion resistance:
At cutterhead front exterior lateral area and cutterhead lateral side regions build-up wear-resistant grid, the thickness of wear-resisting grid is not less than 5mm.
When the diameter of described steel bar concrete pile is greater than 1000mm, the identical Cutting trajectory of a cutter configures deposit cut a cutter cutting with front, deposit is cut a cutter and is taked goat's horn cutter type, and its height is cut between a cutter and common scraper between front; Each Cutting trajectory arranges that 1 cuts a cutter deposit.
Beneficial effect of the present invention is:
Strengthen cutterhead rigidity and abrasion resistance, can avoid that cutterhead large deformation occurs, be worn through the phenomenons such as even disintegration; What enhance center cutter region cuts an ability, ensure that the cutting effect in the middle part of to pile foundation also can prevent cutter head center region mud lining; Strengthen the deposit cutting power of cutter, improve the safety factor of cutting stake.
Accompanying drawing explanation
Fig. 1 is the elevation of knife disc tool Enhancement Method of the present invention.
Fig. 2 is the lateral view of knife disc tool Enhancement Method of the present invention.
Number in the figure:
1-cutterhead; 2-deep floor; 3-center cutter; Anxious stake cutter in 4-; 5-cuts in front a cutter; 6-cuts at edge a cutter; The wear-resisting grid of 7-.
Detailed description of the invention
The invention provides the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile, below in conjunction with the drawings and specific embodiments, invention is further described.
The present embodiment is that Suzhou rail transit Line 2 shield structure cuts 14 major diameter bridge pile foundation engineerings knife disc tool Enhancement Method used, the left line of this project and right line respectively tunneling boring cut the bored pile of 7 Φ 1000 ~ 1200mm, main muscle Φ 20 ~ 22mm, concrete strength C30.
The method comprises the following steps:
(1) before cutting stake, the existing cutterhead 1 of nondestructive inspection, checks there is the defect situation such as free from flaw, entrained air bubbles.Through detection, cutterhead is existing defects situation not, therefore directly can apply and cut an engineering.
(2) existing cutterhead spoke with weld deep floor 2 between spoke, from the inside to the outside altogether weld 2 circle, floor Thickness Design value is 5cm, and the rigidity of whole cutterhead and globality are improved.
(3) reduce the height of center cutter, the height of former center cutter 3 is 350mm, and the height of improved center cutter 3 is the thickness of 240mm, center cutter 3, is increased to 200mm by original 100mm.
(4) increase on improved center cutter 3 join row 10 in anxious stake cutter 4, in anxious stake cutter 4 adopt the mode of shell cutter type, one side blade, be fixed on center cutter 3 by the mode of welding; The height of the center shell cutter distance cutter head panel that position is the highest is 350mm.
(5) in the scope of cutterhead front surface region and Tool in Cutting radius 0.6 ~ 3.17m, increased by the mode of welding and join front and cut a cutter, the every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m cuts a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m cuts a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m cuts a cutter front; The spacing of Cutting trajectory is 0.8m, has 34 Cutting trajectories, arranges 49 fronts altogether and cuts a cutter.Front is cut a cutter and is adopted shell cutter type, and alloy blade adopts the mode of double-sided blade, and tool point angle is taken as 90 degree; The blade height that a cutter is cut in front exceedes common more than scraper 6cm;
(6) increase the edge of joining 6 equiphase angle distributions at cutterhead fringe region by the mode of welding and cut a cutter 6, edge is cut a cutter 6 and is adopted shell cutter type, and alloy blade adopts the mode of one side sword; The blade of a cutter 6 is cut to cutterhead outer incline in edge, and namely blade tilt quantity is backbreak and measured as 15mm.
(7) at cutterhead front exterior lateral area and cutterhead lateral side regions build-up wear-resistant grid 7, the thickness of wear-resisting grid 7 is 6mm.
Cut a Pile Diameter that engineering is cut due to Suzhou and be greater than 1000mm, also the identical Cutting trajectory of a cutter configures deposit cut a cutter cutting with front, deposit is cut a cutter and is taked goat's horn cutter type, and its height is cut between a cutter and common scraper between front, and each Cutting trajectory arranges that 1 cuts a cutter deposit.
Knife disc tool after strengthening according to the method described above, cut an engineering in Suzhou and to succeed application, construction effect is good: cutterhead is not almost out of shape, and only there is mild wear front and the side of cutterhead; In anxious stake cutter, front cut a cutter and complete cutting task smoothly, and self-inflicted injury is less; Outward flange cuts the effect that a cutter serves pile foundation of backbreaking, and protects overclad tubes injury-free.
Claims (2)
1. shield structure directly cuts a knife disc tool Enhancement Method for steel bar concrete pile, it is characterized in that, carries out according to the following steps:
Step 1): cutterhead nondestructive inspection:
The existing cutterhead of nondestructive inspection, checks whether existing defects situation, if detect cutterhead existing defects situation, first repairs cutterhead;
Step 2): strengthen cutterhead rigidity:
Weld deep floor at the spoke of existing cutterhead with between spoke, weld 2 ~ 3 circles from the inside to the outside altogether, deep floor interval 0.8 ~ 1.3m, single deep floor thickness is not less than 4cm;
Step 3): transformation center cutter:
Reduce the height of center cutter, the height of improved center cutter is 60% ~ 70% of original height, increases the thickness of center cutter;
Step 4): increase anxious stake cutter in joining:
Improved center cutter increases anxious stake cutter in joining, in anxious stake cutter adopt the mode of shell cutter type, one side blade, be fixed on center cutter by the mode of welding; In the blade width of anxious stake cutter be not more than step 3) in center cutter increase after thickness;
Step 5): increasing is joined front and is cut a cutter:
In the scope of cutterhead front surface region and Tool in Cutting radius 0.6 ~ 3.17m, increased by the mode of welding and join front and cut a cutter; The every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m cuts a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m cuts a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m cuts a cutter front;
Front is cut a cutter and is adopted shell cutter type, and alloy blade adopts the mode of double-sided blade, and tool point angle is taken as 90 degree; The blade height that a cutter is cut in front exceedes common more than scraper 6cm;
Step 6): increase cobordant edge and cut a cutter:
At the arrangement of cutterhead fringe region according to equiphase angle, arrange that 6 cut a cutter (6) edge by the mode of welding, the phase angle difference that neighboring edge cuts a cutter (6) is 60 degree; Edge is cut a cutter and is adopted shell cutter type, and alloy blade adopts the mode of one side sword; The blade of a cutter is cut to cutterhead outer incline in edge, and the blade tilt quantity i.e. amount of backbreaking is 15 ~ 20mm;
Step 7): strengthen cutterhead abrasion resistance:
At cutterhead front exterior lateral area and cutterhead lateral side regions build-up wear-resistant grid, the thickness of wear-resisting grid is not less than 5mm.
2. shield structure according to claim 1 directly cuts the knife disc tool Enhancement Method of steel bar concrete pile, it is characterized in that, when the diameter of described steel bar concrete pile is greater than 1000mm, the identical Cutting trajectory of a cutter configures deposit cut a cutter cutting with front, deposit is cut a cutter and is taked goat's horn cutter type, and its height is cut between a cutter and common scraper between front; Each Cutting trajectory arranges that 1 cuts a cutter deposit.
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| CN201310629364.1A CN103670429B (en) | 2013-11-29 | 2013-11-29 | A kind of shield structure directly cuts the knife disc tool Enhancement Method of steel bar concrete pile |
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| CN103670429B true CN103670429B (en) | 2016-01-20 |
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| CN104594912A (en) * | 2014-11-21 | 2015-05-06 | 北京城建设计发展集团股份有限公司 | Method for grinding and penetrating through pile groups through shield tunneling machine |
| CN105065011A (en) * | 2015-08-05 | 2015-11-18 | 上海隧道工程有限公司 | Construction method of soft soil shield tunneling cutting pile foundation |
| CN105736008A (en) * | 2016-02-01 | 2016-07-06 | 中铁建大桥工程局集团第三工程有限公司 | Configuration method of cutterhead tools of multi-balance comprehensive pipe jacking machine in water sand-rich and gravel-rich stratum |
| CN105673030B (en) * | 2016-03-01 | 2017-12-29 | 华北电力大学 | Increase the method and curved surface cutterhead of the discontinuous cutterhead rigidity of complete-section tunnel boring machine |
| CN105697030B (en) * | 2016-03-02 | 2018-08-10 | 华北电力大学 | Increase the method and curved surface cutterhead of complete-section tunnel boring machine continuous type cutterhead rigidity |
| CN106050252A (en) * | 2016-08-10 | 2016-10-26 | 中铁十六局集团北京轨道交通工程建设有限公司 | Shield tunneling machine cutterhead suitable for expansible old clay |
| CN106640101B (en) * | 2016-12-18 | 2018-08-17 | 中铁二十局集团第五工程有限公司 | Method for repairing and constructing is worn in shield cutter tunnel |
| CN108005670A (en) * | 2017-12-12 | 2018-05-08 | 北京交通大学 | A kind of shield cuts armored concrete clump of piles system |
| CN108915709A (en) * | 2018-05-29 | 2018-11-30 | 中铁隧道集团二处有限公司 | A kind of slurry shield of area near a river cuts the construction method of existing bridge single-pile foundation |
| CN109184716B (en) * | 2018-11-12 | 2020-07-14 | 嘉兴麦瑞网络科技有限公司 | External tunneling assembly of shield tunneling machine cutter head |
| CN112983446A (en) * | 2021-04-22 | 2021-06-18 | 中铁一局集团第二工程有限公司 | Construction method for shield cutting of existing station reinforced concrete fender post |
| CN113202489A (en) * | 2021-05-31 | 2021-08-03 | 北京石油化工学院 | Method for improving working efficiency of shield tunneling machine in cutting reinforced concrete pile foundation |
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| JPH0696949B2 (en) * | 1988-06-30 | 1994-11-30 | 戸田建設株式会社 | Construction method of rectangular section tunnel and shield machine used for it |
| JP2584174B2 (en) * | 1992-09-28 | 1997-02-19 | 鹿島建設株式会社 | Cutter disk of shield machine |
| JPH09303088A (en) * | 1996-05-20 | 1997-11-25 | Nippon Shibitsuku Consultant Kk | Method for replacing cutter bit for shield machine |
| JP3750052B2 (en) * | 2000-12-27 | 2006-03-01 | 清水建設株式会社 | How to replace the cutter bit in a shield machine |
| CN201687482U (en) * | 2010-06-08 | 2010-12-29 | 上海隧道工程股份有限公司 | Semicircular oyster knife |
| CN102418531B (en) * | 2011-12-14 | 2013-12-11 | 中铁十二局集团有限公司 | Tunneling construction method for directly removing overpass group piles by using shield machine |
| CN102966358B (en) * | 2012-11-12 | 2014-08-06 | 中铁二局股份有限公司 | Construction method for shield-cut reinforced concrete pile under main line of operational railway |
| CN103061777B (en) * | 2013-01-18 | 2015-03-04 | 中铁隧道集团有限公司 | Method for building urban underground tunnel shield cutter repairing space with preset reinforcing pile groups |
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