CN106703034A - Construction device and construction method for pulling out piles through cooperation of rotating drilling machine and sleeve drill bit - Google Patents

Construction device and construction method for pulling out piles through cooperation of rotating drilling machine and sleeve drill bit Download PDF

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Publication number
CN106703034A
CN106703034A CN201710042587.6A CN201710042587A CN106703034A CN 106703034 A CN106703034 A CN 106703034A CN 201710042587 A CN201710042587 A CN 201710042587A CN 106703034 A CN106703034 A CN 106703034A
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CN
China
Prior art keywords
sleeve pipe
pile body
pile
rotary rig
bit
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
Application number
CN201710042587.6A
Other languages
Chinese (zh)
Inventor
杜湘豪
郑红亮
陈志�
刘浩然
肖乾珍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seventh Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Original Assignee
Seventh Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seventh Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd filed Critical Seventh Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
Priority to CN201710042587.6A priority Critical patent/CN106703034A/en
Publication of CN106703034A publication Critical patent/CN106703034A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/02Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/20Miscellaneous comprising details of connection between elements

Abstract

The invention provides a construction device for pulling out piles through cooperation of a rotating drilling machine and a sleeve drill bit. The construction device comprises the rotating drilling machine, the sleeve drill bit and a sleeve set composed of a plurality of sleeves; at least one sleeve in the sleeve set is detachably connected to the rotary drilling machine; and the sleeve drill bit is detachably connected to the sleeve at the bottommost end of the sleeve set. The invention further provides a construction method of the construction device. The construction method comprises the steps that S1, a foundation trench is excavated, and the pile position is rechecked; S2, a platform is set up, and the rotary drilling machine is put in place; S3, the sleeve drill bit drills, and a pile body and soil are separated; S4, the pile body is lifted and is sectionally pulled out; and S5, backfilling of mortar is carried out, and slurry is transported outwards. The construction device and the construction method for pulling out the piles through the cooperation of the rotating drilling machine and the sleeve drill bit have the characteristics of being low in construction cost, low in risk, simple and convenient to operate, wide in application range and the like.

Description

Rotary rig coordinates pipe bit pile pulling constructing device and method
Technical field
Construction field is pulled out the present invention relates to pile body, and in particular to a kind of rotary rig coordinates pipe bit pile pulling construction dress Put and method.
Background technology
Underground piping, the tunnel of the trenchless technologies such as push pipe, shield construction, can run into discarded unavoidably when being constructed in city The pile foundation engineering that building is left.These pile foundation engineerings turn into the biggest obstacle of tunnel machineization construction, particularly its inside Bar construction, is catastrophic for push-bench, shield machine, cutterhead can be caused to damage, stuck or even cannot tunnel.Therefore, Must be pulled out before driving, it is ensured that push-bench, shield machine are passed through.
Conventional pile pulling technique is by full rotation rig pile pulling method, hammering method, wherein pile sinking method, hammering method and pile sinking method at present In the presence of halfway risk is removed, the soil body tends to have reinforcing bar or concrete is left, and push pipe, shield driving are had undesirable effect;Entirely Rotary rig pile pulling, the construction technology equipment is huge, control system is complicated, construction cost is high, simultaneously because equipment is huge, to applying The requirement of work site condition is high, and large scale equipment construction operation requirement cannot be met under the conditions of some specific landform, limits wheel Turn the range of application of rig pile pulling.
The content of the invention
The technical problems to be solved by the invention are, in view of the shortcomings of the prior art, there is provided a kind of low cost, risk Rotary rig low, easy to operate, applied widely coordinates pipe bit pile pulling constructing device and method.
In order to solve the above technical problems, the present invention uses following technical scheme:
A kind of rotary rig coordinates pipe bit pile pulling constructing device, including rotary rig, pipe bit and by many sleeve pipes The sleeve pipe group of composition, at least one sleeve pipe in described sleeve pipe group is detachably connected with the rotary rig, described sleeve pipe drill bit Sleeve pipe with lowermost end is detachably connected.
As the further improvement to above-mentioned technical proposal:
The drilling end of described sleeve pipe drill bit is circumferentially provided with more than two drilling tools.
The other end of described sleeve pipe drill bit is provided with drill set orchid, and described sleeve pipe group bottom is provided with sleeve pipe connection method The blue connection of orchid, described sleeve pipe adpting flange and the drill set.
The bottom of the drilling rod is provided with drilling rod adpting flange, and described sleeve pipe group upper end also is provided with described in sleeve pipe connection flange Drilling rod adpting flange is connected with the sleeve pipe connection flange of described sleeve pipe group upper end.
Used as a total inventive concept, the present invention also provides a kind of rotary rig and coordinates pipe bit pile pulling construction party Method, comprises the following steps:
S1, foundation trench are excavated, stake position is checked:Surveying and locating determines that the position of pile body need to be pulled out, and excavates foundation trench, to exposed pile body position Put and checked;
S2, putting up platform, rotary rig are in place:Rotary rig operation platform is set up, adjustment rotary rig position ensures rotary drilling The drilling rod of machine and the pile foundation center superposition of pile body, install sleeve pipe and pipe bit, it is ensured that in pile foundation center, cannula center, drilling rod The heart overlaps, and to pouring into mud in foundation trench;
S3, casing drilling, stake soil are separated:Sleeve pipe starts drilling, after the completion of casing drilling, sleeve pipe and drilling rod is removed, in sleeve pipe Another sleeve pipe is connected between drilling rod, continues to creep into, connected another sleeve pipe between sleeve pipe and drilling rod according to actual needs and continue Drilling, until pile body and the periphery soil body are separated into free state, merogenesis removes sleeve pipe, creeps into as mud direct circulation is crept into;
S4, pile body lifting, segmentation are extracted:After pile body and the periphery soil body are separated, pile body is entangled using ropy, lifting pile body is extremely Frame top, peels off pile body periphery concrete exposure pile body cage bar, and another ropy entangles pile body firm, between two ropies of cut-out Cage bar blocks pile body, and the pile body that will be blocked is hung to deposit position, is repeated in above-mentioned steps, until pile body all pulls out knot Beam;
S5, mortar recharge, mud outward transport:After the completion of pile body is pulled out, by mortar recharge sealing of hole, mud is transported to specified location.
As the further improvement to above-mentioned technical proposal:
In the step S1, the width of foundation trench is D1, a diameter of D2, D1 >=D2+3m of pile body.
The proportion of mud is 1.1~1.4 in the step S2, and viscosity is 210s~212s, sand factor < 8%, mud quantity It is 1.5 times~2.0 times of pile body.
The step S3 also includes checking whether the proportion of mud, viscosity, sand factor meet the requirements.
Mud direct circulation drilling is specially in the step S3:The soil body between pile body and sleeve pipe washes away stripping by mud, Boring mud is carried to stock tank by mud.
The concrete technology of the step S5 mortars recharge sealing of hole is underwater concreting technique.
Compared with prior art, the present invention has advantages below:
Rotary rig of the invention coordinates pipe bit pile pulling constructing device, including rotary rig, sleeve pipe group and pipe bit, institute State rotary rig and be provided with drilling rod, the drilling rod, sleeve pipe group and pipe bit are detachably connected successively, and described sleeve pipe group at least includes One sleeve pipe, rotary rig can walking, without large tonnage crane lifting, rotary rig small volume, from heavy and light, equipment letter Single, compact, construction technology is simple, and construction cost is low.At least one sleeve pipe in sleeve pipe group is detachably connected with rotary rig, set Pipe bit is detachably connected with the sleeve pipe of lowermost end, according to the physical length of pile body, can in time increase the number of sleeve pipe group inner sleeve Amount, strong applicability, completing after pile body extracts, can dismounting drilling rod, sleeve pipe group and pipe bit one by one, be easy to sleeve pipe group and sleeve pipe The dismounting of drill bit.
Rotary rig of the invention coordinates pipe bit pile-pulling construction method to be crept into using mud direct circulation, flat without drilling Platform provides very big counter-force, low to construction site requirement, and construction method of the invention is simple, strong operability, sleeve pipe group inner sleeve The quantity of pipe can be applied widely according to increase is actually needed.
Brief description of the drawings
Fig. 1 is the flow chart that rotary rig of the present invention coordinates pipe bit pile-pulling construction method.
Fig. 2 is the schematic diagram that rotary rig of the present invention coordinates pipe bit pile-pulling construction method.
Fig. 3 is middle sleeve drill bit front view of the present invention.
Fig. 4 is the top view of middle sleeve drill bit of the present invention.
Fig. 5 is the stereoscopic mechanism figure of middle sleeve drill bit of the present invention.
Fig. 6 is the front view of middle sleeve of the present invention.
Fig. 7 is the top view of middle sleeve of the present invention.
Fig. 8 is the front view of drilling rod in the present invention.
Fig. 9 is the upward view of drilling rod in the present invention.
Marginal data:
1st, platform;2nd, rotary rig;21st, drilling rod;211st, drilling rod adpting flange;4th, sleeve pipe group;41st, sleeve pipe;411st, sleeve pipe connection Flange;5th, pipe bit;51st, drill set is blue;52nd, blade row;53rd, drilling tool;6th, foundation trench;7th, pile body;9th, clip.
Specific embodiment
The present invention is expanded on further below with reference to specification drawings and specific embodiments.
As shown in Figure 1 to 9, rotary rig cooperation pipe bit pile pulling constructing device of the invention, including rotary rig 2, Pipe bit 5 and the sleeve pipe group 4 being made up of many sleeve pipes 41, at least one sleeve pipe 41 and the rotation in described sleeve pipe group 4 Turn rig 2 to be detachably connected, described sleeve pipe drill bit 5 is detachably connected with the sleeve pipe 41 of lowermost end.Rotary rig 2 in the present apparatus Can walking, without large tonnage crane lifting, the small volume of rotary rig 2, from heavy and light, equipment is simple, compact, construction technology Simply, construction cost is low.At least one sleeve pipe 41 in described sleeve pipe group 4 is detachably connected with the rotary rig 2, the set Pipe bit 5 is detachably connected with the sleeve pipe 41 of lowermost end, can in time increase the inner sleeve of sleeve pipe group 4 according to the physical length of pile body 7 41 quantity, strong applicability, completing after pile body 7 extracts, can dismounting drilling rod 21, sleeve pipe group 4 and pipe bit 5 one by one, be easy to The dismounting of sleeve pipe group 4 and pipe bit 5.In the present embodiment, the quantity of the inner sleeve 41 of sleeve pipe group 4 is 4.
The drilling end of pipe bit 5 is circumferentially provided with more than two drilling tools 53.In the present embodiment, during pipe bit 5 is interior It is empty.
The drilling end of pipe bit 5 is circumferentially provided with more than two blade rows 52, and the bottom of blade row 52 and sidepiece are provided with two Drilling tool 53 above, in the present embodiment, four blade rows 52 are uniformly arranged on the circumference of pipe bit 5, and each bottom of blade row 52 is equal Three drilling tools 53 are provided with, the sidepiece of each blade row 52 is equipped with a drilling tool 53.
The other end of pipe bit 5 is provided with drill set orchid 51, and the bottom of sleeve pipe group 4 is provided with sleeve pipe connection flange 411, Sleeve pipe connection flange 411 and drill set blue 51 are connected.
The bottom of drilling rod 21 is provided with drilling rod adpting flange 211, and the upper end of sleeve pipe group 4 also is provided with sleeve pipe connection flange 411 and bores Bar adpting flange 211 is connected with the sleeve pipe connection flange 411 of the upper end of sleeve pipe group 4.
Sleeve pipe connection flange 411 is provided with the both ends of sleeve pipe 41, is connected by sleeve pipe connection flange 411 between adjacent casing 41 It is connected into one.It is detachably connected between sleeve pipe 41, is easy to complete the dismounting of the extraction rear sleeve of pile body 7 group 4.
In the present embodiment, pile body 7 is located at the bottom of foundation trench 6, and rotary rig 2 is installed on platform 1, and platform 1 is erected on foundation trench 6 Top.
In the present embodiment, clip 9 is installed on the excircle of pipe bit 5 and sleeve pipe 41, when dismounting sleeve pipe 41 and sleeve pipe During drill bit 5, two pieces of hollow flashboards are closed on borer frame, and clip 9 is stuck in flashboard top, prevent sleeve pipe 41 and pipe bit 5 because Sink for gravity.
In the present embodiment, platform 1 is set up using 40B I-steel and formed, and the spacing of adjacent I-steel is 1m, adjacent I-steel Between set longitudinal connecting member, it is ensured that platform rigidity.
A kind of rotary rig of the invention coordinates pipe bit pile-pulling construction method, comprises the following steps:
Step one:Foundation trench is excavated, stake position is checked
A, surveying and locating determine that the position of pile body 7 need to be pulled out, and then excavate foundation trench 6, and the width D 1 of foundation trench 6 is with the diameter of pile body 7 1.5m is put outside D2 both sides to be advisable, facilitate operating personnel to be directed at the position of pile body 7 and be easy to indirectly in sleeve pipe 41 and drilling rod 21 Another sleeve pipe 41 and binding pile body 7;B, foundation trench 6 are advisable less than the top 0.21m of pile body 7, depth 21m~21.5m, are easy to Sleeve drill First 5 and drilling rod 3 connect;After the completion of C, foundation trench 6 are excavated, the position of pile body 7 to exposing is checked, and determines that pile body 7 pulls out position Putting satisfaction driving party in request can carry out pile pulling construction.
Step 2:Putting up platform, rotary rig are in place
A, the operation platform 1 of rotary rig 2 is set up using 40B I-steel;B, rotary rig 2 are positioned on platform 1, adjust rotary drilling The position of machine 2 ensures drilling rod 21 and needs the pile foundation center superposition of pile pulling body 7;C, installation sleeve pipe 41 and pipe bit 5, it is ensured that in pile foundation The heart, the center of sleeve pipe 41, the center superposition of drilling rod 21;D, the configuration mud in foundation trench 6, mud balance 1.21 or so, viscosity 210s~ 212s, sand factor < 8%, mud quantity are 1.5 times~2.0 times of pile body, mud indices are irregularly detected during drilling, really Mud is protected to meet the requirements.
Step 3:Casing drilling, stake soil are separated
A, the bottom of pipe bit 5 carry drilling tool 53, depending on geological conditions of the drilling tool 53 according to where pile body 7, in the present embodiment Drilling tool 53 is bit drill, and sleeve pipe 41, drilling rod 21 start drilling after the completion of connecting;B, using mud direct circulation creep into, the He of pile body 7 The soil body between sleeve pipe 41 washes away stripping by mud, and boring mud is carried in the stock tank to foundation trench 6 by mud;C, first segment sleeve pipe 41 After the completion of drilling, the connecting bolt between drilling rod 21 and sleeve pipe 41 is removed, connect another between first segment sleeve pipe 41 and drilling rod 21 Sleeve 41, continues to creep into;D, above step is repeated, until sleeve pipe 41 is crept into the elevation of bottom of pile body 7, pile body 7 and week The side soil body is separated, into free state;E, merogenesis remove sleeve pipe 41.
Step 4:Pile body lifting, segmentation are extracted
After A, pile body 7 and the periphery soil body are peeled off, risen sheer from hole into free state, using the annular steel wire rope sling of retractable Firmly pile body 7, frame top is promoted to using the main winch of rotary rig 2 by pile body 7;B, using another steel cable by pile body 7 entangle firm, hang on the frame of rotary rig 2, and then whereabouts pile body 7 is to steel wire rope stress;C, artificial use pneumatic pick peel off pile body Periphery concrete, exposes the cage bar of pile body 7, and the cage bar between two steel wire ropes is breaking at using oxyacetylene metal-cutting, and pile body 7 is blocked;D, utilization The pile body 7 that truck crane will be blocked is hung to deposit position;E, repetition " cover, pull out, breaking, moving ", until pile body 7 all pulls out end.
Step 5:Mortar recharge, mud outward transport
After the completion of A, pile body 7 are pulled out, measured hole bottom absolute altitude and design altitude are compared, determine it is errorless after can recharge;B, use M1.5 mortar recharge sealing of holes, recharge uses underwater concreting technique;The slurry collecting that C, mortar recharge are displaced is in mud Pond, formulation position is transported to using mud tank car.
Rotary rig of the invention coordinates pipe bit pile-pulling construction method drilling using mud direct circulation drilling, without flat Platform 1 provides very big counter-force, low to construction site requirement, and construction method is simple, strong operability, the quantity of the inner sleeve 41 of sleeve pipe group 4 Can be applied widely according to increase is actually needed.
In the present embodiment, construction site is to wear external diode laser north bank bank under the Hong Wulu sewage main pipe Project Shields of Nanjing Slope, embankment supporting uses the deposited reinforced concrete piles of 2 row φ 800, array pitch 1.4m, stake spacing 1.5m, stake 20m long, stake bottom absolute altitude Need to pull out less than ttom of pipe absolute altitude, before shield-tunneling construction.Pile pulling body 7 is needed to be located at bank slope toe, and it is nearer apart from city wall, do not possess large-scale Equipment construction condition.
Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.It is any to be familiar with ability The technical staff in domain, in the case where technical solution of the present invention scope is not departed from, all using the technology contents pair of the disclosure above Technical solution of the present invention makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every Without departing from the content of technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, Equivalent variations and modification, all should fall in the range of technical solution of the present invention protection.

Claims (10)

1. a kind of rotary rig coordinates pipe bit pile pulling constructing device, it is characterised in that including rotary rig(2), Sleeve drill Head(5)And by many sleeve pipes(41)The sleeve pipe group of composition(4), described sleeve pipe group(4)In at least one sleeve pipe(41)With institute State rotary rig(2)It is detachably connected, described sleeve pipe drill bit(5)With the sleeve pipe of lowermost end(41)It is detachably connected.
2. rotary rig according to claim 1 coordinates pipe bit pile pulling constructing device, it is characterised in that described sleeve pipe Drill bit(5)Drilling end more than two drilling tools are circumferentially installed(53).
3. rotary rig according to claim 2 coordinates pipe bit pile pulling constructing device, it is characterised in that described sleeve pipe Drill bit(5)The other end to be provided with drill set blue(51), described sleeve pipe group(4)Bottom is provided with sleeve pipe connection flange(411), Described sleeve pipe adpting flange(411)It is blue with the drill set(51)Connection.
4. rotary rig according to claim 3 coordinates pipe bit pile pulling constructing device, it is characterised in that the drilling rod (21)Bottom be provided with drilling rod adpting flange(211), described sleeve pipe group(4)Upper end also is provided with sleeve pipe connection flange(411)Institute State drilling rod adpting flange(211)With described sleeve pipe group(4)The sleeve pipe connection flange of upper end(411)Connection.
5. a kind of rotary rig coordinates pipe bit pile-pulling construction method, it is characterised in that comprise the following steps:
S1, foundation trench are excavated, stake position is checked:Surveying and locating determines that pile body need to be pulled out(7)Position, excavate foundation trench(6), to exposed Pile body(7)Checked position;
S2, putting up platform, rotary rig are in place:Set up rotary rig(2)Operation platform, adjusts rotary rig(2)Position ensures Rotary rig(2)Drilling rod(21)And pile body(7)Pile foundation center superposition, install sleeve pipe(41)And pipe bit(5), it is ensured that stake Base center, sleeve pipe(41)Center, drilling rod(21)Center superposition, and to foundation trench(6)Inside pour into mud;
S3, casing drilling, stake soil are separated:Sleeve pipe(41)Start drilling, sleeve pipe(41)After the completion of drilling, by sleeve pipe(41)With drilling rod (21)Remove, in sleeve pipe(41)With drilling rod(21)Between connect another sleeve pipe(41), continue to creep into, according to actual needs in sleeve pipe (41)With drilling rod(21)Between connect another sleeve pipe(41)Continue to creep into, until pile body(7)Free shape is separated into the periphery soil body State, merogenesis removes sleeve pipe(41), creep into as mud direct circulation is crept into;
S4, pile body lifting, segmentation are extracted:Work as pile body(7)After being separated with the periphery soil body, pile body is entangled using ropy(7), lifting Pile body(7)To frame top, pile body is peeled off(7)Periphery concrete exposure pile body(7)Cage bar, another ropy entangles pile body firm(7), Cage bar between two ropies is cut off by pile body(7)Block, the pile body that will be blocked(7)Deposit position is hung to, is repeated in above-mentioned Step, until pile body(7)All pull out end;
S5, mortar recharge, mud outward transport:Pile body(7)After the completion of pulling out, by mortar recharge sealing of hole, mud is transported to specified location.
6. rotary rig according to claim 5 coordinates pipe bit pile-pulling construction method, it is characterised in that the step In S1, foundation trench(6)Width be D1, pile body(7)A diameter of D2, D1 >=D2+3m.
7. the rotary rig according to claim 5 or 6 coordinates pipe bit pile-pulling construction method, it is characterised in that described The proportion of mud is 1.1~1.4 in step S2, and viscosity is 210s~212s, and sand factor < 8%, mud quantity is pile body(7)'s 1.5 times~2.0 times.
8. rotary rig according to claim 7 coordinates pipe bit pile-pulling construction method, it is characterised in that the step S3 also includes checking whether the proportion of mud, viscosity, sand factor meet the requirements.
9. rotary rig according to claim 5 coordinates pipe bit pile-pulling construction method, it is characterised in that the step Mud direct circulation drilling is specially in S3:Pile body(7)And sleeve pipe(41)Between the soil body stripping is washed away by mud, boring mud is by mud Carry to stock tank.
10. the rotary rig according to claim 5 or 6 coordinates pipe bit pile-pulling construction method, it is characterised in that described The concrete technology of step S5 mortar recharge sealing of holes is underwater concreting technique.
CN201710042587.6A 2017-01-20 2017-01-20 Construction device and construction method for pulling out piles through cooperation of rotating drilling machine and sleeve drill bit Pending CN106703034A (en)

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CN201710042587.6A CN106703034A (en) 2017-01-20 2017-01-20 Construction device and construction method for pulling out piles through cooperation of rotating drilling machine and sleeve drill bit

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Application Number Priority Date Filing Date Title
CN201710042587.6A CN106703034A (en) 2017-01-20 2017-01-20 Construction device and construction method for pulling out piles through cooperation of rotating drilling machine and sleeve drill bit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110306553A (en) * 2019-04-28 2019-10-08 中国一冶集团有限公司 Piling bar removes device and method in water

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JP2014084611A (en) * 2012-10-23 2014-05-12 Taiyo Kiso Kogyo Kk Pull-out device for buried pile
CN105649083A (en) * 2016-03-18 2016-06-08 宁波鸿晨建设有限公司 All-casing one-time rotary cutting type pile removing device and pile removing method thereof

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CN101130988A (en) * 2007-08-16 2008-02-27 江苏华东建设基础工程总公司 Pile extractor and construction method thereof
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Publication number Priority date Publication date Assignee Title
CN110306553A (en) * 2019-04-28 2019-10-08 中国一冶集团有限公司 Piling bar removes device and method in water
CN110306553B (en) * 2019-04-28 2021-06-29 中国一冶集团有限公司 Underwater steel pile dismantling device and method

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Application publication date: 20170524