CN103670429A - Cutterhead and cutter reinforcing method for directly cutting reinforced concrete pile foundations by shield - Google Patents
Cutterhead and cutter reinforcing method for directly cutting reinforced concrete pile foundations by shield Download PDFInfo
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- CN103670429A CN103670429A CN201310629364.1A CN201310629364A CN103670429A CN 103670429 A CN103670429 A CN 103670429A CN 201310629364 A CN201310629364 A CN 201310629364A CN 103670429 A CN103670429 A CN 103670429A
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Abstract
The invention belongs to the technical field of shield tunnel construction of city subways, in particular to a cutterhead and cutter reinforcing method for directly cutting reinforced concrete pile foundations by a shield. The method includes the steps of performing nondestructive inspection on a cutterhead, reinforcing rigidity of the cutterhead, modifying a center cutter, additionally arranging center pile cutters, front pile cutters and edge pile cutters, and reinforcing abrasive resistance of the cutterhead. By the method, rigidity and abrasive resistance of the cutterhead can be reinforced, pile cutting capability of a center-cutter region can be improved, and reserved cutting capability of the cutters can be enhanced, so that risks in directly cutting the reinforced concrete pile foundations by the shield are reduced and smooth pile cutting work is guaranteed.
Description
Technical field
The invention belongs to city underground shield tunnel construction technology field, relate in particular to the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile.
Background technology
Shield construction due to its have safety, fast, cause that stratum settlement is little, mechanization degree advantages of higher, be widely used in each metropolitan urban rail transit construction of China.Along with the encryption gradually of Metro Network, when urban central zone is built shield tunnel, be more and more difficult to avoid meeting with the underground obstacles such as steel bar concrete pile.Because shield machine is when dispatching from the factory design, the general problem of not considering Cutting Steel reinforced concrete obstruction, therefore the knife disc tool of conventional shield machine does not possess the ability of direct cutting steel bar concrete pile substantially, therefore, the outer engineering circles of Present Domestic is processed pile foundation obstruction, generally takes manually after pile foundation underpinning to cut stake, removes after pile pulling after superstructure, excavating shaft the conventional methods such as cutter stake and remove in advance obstacle pile.
Development along with shield structure technology, on the basis that existing knife disc tool transformation is strengthened, in recent years China also occurred several shield structures directly cut stake Engineering Projects, for example, No. ten line shield structures of Shanghai Underground increase joins 1 cover dual-pilot cutter and 6 cutting 33 400mm * 400mm precast square piles after shell cutter, after 65 dual-pilot cutters are joined in No. seven line shield structures increasings of Shanghai Underground, cut 10 350mm * 350mm stand column pile, after 9 periphery hobboing cutters are joined in a line shield structure increasing of Hangzhou Subway, cut three row Φ 1000 castinplace piles.
Than conventional method, shield structure is directly cut stake and is had the advantages such as the surrounding enviroment of impact are little, cost is low, the duration is short, society and remarkable in economical benefits.
For shield structure cutting steel bar concrete pile situation, analyze the existing knife disc tool transformation of summary and add strong method, find to exist following three problems: one, just increase to have joined and cut a cutter, the rigidity of cutterhead and abrasion resistance are not strengthened, and cutterhead is as the carrier of cutter, once large deformation, the phenomenons such as even disintegration that are worn through occur for it, consequence is catastrophic; Two, an ability of cutting in tool setting disk center cutter region does not strengthen, and in this case, is difficult to cut on the one hand pile foundation middle part, and center cutter very easily causes cutterhead central area mud lining after serious wear on the other hand; Three, when cutting is during large diameter pile foundation, cutter enhancement measures a little less than, safety factor is lower, risk is high.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, the knife disc tool Enhancement Method that a kind of shield structure directly cuts steel bar concrete pile has been proposed, cutterhead rigidity and abrasion resistance have been strengthened, strengthened an ability of cutting in center cutter region, and strengthened the deposit cutting power of cutter, thereby reduced the risk that shield structure directly cuts steel bar concrete pile, guaranteed to cut the smooth enforcement of 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 there is defect situation, if detect cutterhead, has defect situation, first cutterhead is repaired;
Step 2): strengthen cutterhead rigidity:
Between the spoke of existing cutterhead and spoke, weld deep floor, weld altogether from the inside to the outside 2～3 circles, 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 original height 60%～70%, increases the thickness of center cutter, the blade width of anxious stake cutter during the thickness after increase is not less than;
Step 4): increasing is anxious stake cutter in joining:
On improved center cutter, increase join in anxious stake cutter, in anxious stake cutter adopt the mode of shell cutter type, one side blade, the mode by welding is fixed on center cutter;
Step 5): increasing is joined front and cut a cutter:
In the positive region of cutterhead, be in the scope of Tool in Cutting radius 0.6～3.17m, mode by welding increases joins front and cuts a cutter, the every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m is cut a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m is cut a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m is cut 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 surpasses more than common scraper 6cm;
Step 6): increase cobordant edge and cut a cutter:
At cutterhead fringe region, according to the arrangement at equiphase angle, by the mode of welding, arrange that 6 cut a cutter (6) edge, the phase angle difference that neighboring edge is cut 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 the positive exterior lateral area of cutterhead 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, cut a cutter cutting on the Cutting trajectory that a cutter is identical configuration deposit 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:
Strengthened cutterhead rigidity and abrasion resistance, can avoid that cutterhead large deformation occurs, the phenomenons such as even disintegration are worn through; Strengthened an ability of cutting in center cutter region, guaranteed the cutting effect at pile foundation middle part and can prevent cutterhead central area mud lining; Strengthen the deposit cutting power of cutter, improved 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-.
The specific embodiment
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 14 knife disc tool Enhancement Method that major diameter bridge pile foundation engineering is used of Suzhou rail transit Line 2 shield structure cutting, the bored pile of 7 Φ 1000～1200mm of the respectively full section cutting of the left line of this project and right line, 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 and has the defect situation such as free from flaw, entrained air bubbles.Through surveying, there is not defect situation in cutterhead, therefore can directly apply and cut an engineering.
(2) between the spoke of existing cutterhead and spoke, weld deep floor 2, weld altogether from the inside to the outside 2 circles, 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 240mm, and the thickness of center cutter 3 is increased to 200mm by original 100mm.
(4) on improved center cutter 3, increase join row 10 in anxious stake cutter 4, in anxious stake cutter 4 adopt the mode of shell cutter types, one side blade, the mode by welding is fixed on center cutter 3; Gao center, position shell cutter is 350mm apart from the height of cutter head panel.
(5) in the positive region of cutterhead, be in the scope of Tool in Cutting radius 0.6～3.17m, mode by welding increases joins front and cuts a cutter, the every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m is cut a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m is cut a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m is cut a cutter front; The spacing of Cutting trajectory is 0.8m, has 34 Cutting trajectories, has arranged that altogether 49 cut 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 surpasses more than common scraper 6cm;
(6) at cutterhead fringe region, the mode by welding increases and joins the edge that 6 equiphase angles distribute and cut a cutter 6, and edge is cut a cutter 6 and adopted shell cutter types, 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 blade tilt quantity is backbreak and measured as 15mm.
(7) at the positive exterior lateral area of cutterhead and cutterhead lateral side regions build-up wear-resistant grid 7, the thickness of wear-resisting grid 7 is 6mm.
Owing to cutting a Pile Diameter that engineering is cut and be greater than 1000mm in Suzhou, also cut a cutter cutting on the Cutting trajectory that a cutter is identical configuration deposit 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, cuts the engineering application that succeeds in Suzhou, construction effect is good: cutterhead is not almost out of shape, and only there is mild wear the front of cutterhead and side; In anxious stake cutter, front cut a cutter and completed smoothly cutting task, and self-inflicted injury is less; Outward flange is cut the effect that a cutter has played the pile foundation of backbreaking, and has protected 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 there is defect situation, if detect cutterhead, has defect situation, first cutterhead is repaired;
Step 2): strengthen cutterhead rigidity:
Between the spoke of existing cutterhead and spoke, weld deep floor, weld altogether from the inside to the outside 2～3 circles, 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 original height 60%～70%, increases the thickness of center cutter, the blade width of anxious stake cutter during the thickness after increase is not less than;
Step 4): increasing is anxious stake cutter in joining:
On improved center cutter, increase join in anxious stake cutter, in anxious stake cutter adopt the mode of shell cutter type, one side blade, the mode by welding is fixed on center cutter;
Step 5): increasing is joined front and cut a cutter:
In the positive region of cutterhead, be in the scope of Tool in Cutting radius 0.6～3.17m, the mode by welding increases joins front and cuts a cutter; The every arranged in tracks 1 in region of radius of clean-up 0.6m≤r≤2.0m is cut a cutter front, the every arranged in tracks 2 in region of radius of clean-up 2.0m<r≤3.0m is cut a cutter front, and the every arranged in tracks 3 in region of radius of clean-up 3.0m<r≤3.17m is cut 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 surpasses more than common scraper 6cm;
Step 6): increase cobordant edge and cut a cutter:
At cutterhead fringe region, according to the arrangement at equiphase angle, by the mode of welding, arrange that 6 cut a cutter (6) edge, the phase angle difference that neighboring edge is cut 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 the positive exterior lateral area of cutterhead 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, cut a cutter cutting on the Cutting trajectory that a cutter is identical configuration deposit 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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| 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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| CN103670429A true CN103670429A (en) | 2014-03-26 |
| CN103670429B CN103670429B (en) | 2016-01-20 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105673030A (en) * | 2016-03-01 | 2016-06-15 | 华北电力大学 | Method for improving rigidity of discontinuous cutterhead of full-face tunnel boring machine and curved surface cutterhead |
| CN105697030A (en) * | 2016-03-02 | 2016-06-22 | 华北电力大学 | Method for increasing rigidity of continuous cutter head of full-face tunnel boring machine and hook face cutter head |
| 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 |
| 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 |
| CN106640101A (en) * | 2016-12-18 | 2017-05-10 | 中铁二十局集团第五工程有限公司 | Shied cutter head abrasion repairing construction method in 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 |
| CN109184716A (en) * | 2018-11-12 | 2019-01-11 | 严小英 | A kind of external driving component of cutter head of shield machine |
| 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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| CN102966358A (en) * | 2012-11-12 | 2013-03-13 | 中铁二局股份有限公司 | Construction method for shield-cut reinforced concrete pile under main line of operational railway |
| CN103061777A (en) * | 2013-01-18 | 2013-04-24 | 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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| 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 |
| JPH06108786A (en) * | 1992-09-28 | 1994-04-19 | Kajima Corp | Cutter disc for shield machine |
| JPH09303088A (en) * | 1996-05-20 | 1997-11-25 | Nippon Shibitsuku Consultant Kk | Method for replacing cutter bit for shield machine |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105673030A (en) * | 2016-03-01 | 2016-06-15 | 华北电力大学 | Method for improving rigidity of discontinuous cutterhead of full-face tunnel boring machine and curved surface cutterhead |
| 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 |
| CN105697030A (en) * | 2016-03-02 | 2016-06-22 | 华北电力大学 | Method for increasing rigidity of continuous cutter head of full-face tunnel boring machine and hook face cutter head |
| 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 |
| CN106640101A (en) * | 2016-12-18 | 2017-05-10 | 中铁二十局集团第五工程有限公司 | Shied cutter head abrasion repairing construction method in 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 |
| CN109184716A (en) * | 2018-11-12 | 2019-01-11 | 严小英 | A kind of external driving component of cutter head of shield machine |
| 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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