CN112031797A - Shield construction maintenance device - Google Patents

Shield construction maintenance device Download PDF

Info

Publication number
CN112031797A
CN112031797A CN202010768247.3A CN202010768247A CN112031797A CN 112031797 A CN112031797 A CN 112031797A CN 202010768247 A CN202010768247 A CN 202010768247A CN 112031797 A CN112031797 A CN 112031797A
Authority
CN
China
Prior art keywords
rod
plate
fixedly connected
square
hole
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.)
Withdrawn
Application number
CN202010768247.3A
Other languages
Chinese (zh)
Inventor
王沛喆
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to CN202010768247.3A priority Critical patent/CN112031797A/en
Publication of CN112031797A publication Critical patent/CN112031797A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/08Making 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/12Devices for removing or hauling away excavated material or spoil; Working or loading platforms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

The invention discloses a shield construction overhaul device which comprises an installation rod, wherein two ends of the installation rod are respectively provided with a square hole, each square hole is internally and slidably connected with a square rod, the end of each square rod is provided with a first idler wheel, each square rod is fixedly connected with a first vertical plate, two ends of the installation rod are respectively and fixedly connected with a second vertical plate, the first vertical plates and the second vertical plates are oppositely arranged, the second vertical plates are provided with first threaded holes, the first threaded holes are in threaded connection with threaded rods, one ends of the threaded rods are rotatably connected with the first vertical plates, and the other ends of the threaded rods are fixedly connected with hand wheels. According to the invention, the poking plate pushes the swinging plate to swing through the periodic reciprocating motion of the sliding rod, the cutter is arc-shaped, and the arc-shaped cutter enables excavated soil to be in a sheet-shaped curled shape and to slide along the arc-shaped surface to be guided to the direction of the circle center of the pipe body, so that the excavation, soil taking and transferring are facilitated.

Description

Shield construction maintenance device
Technical Field
The invention relates to the technical field of shield construction equipment, in particular to a shield construction overhauling device.
Background
The shield method has become the main construction method of tunnel engineering, and mechanical failure, cutter head and cutter abrasion and the like are inevitable in shield construction. Most of shield equipment is overhauled under the protection of a shield body or a formed tunnel structure, but the most key cutter head part is overhauled directly in an excavation surface stratum, and the operation risk is high. The method for overhauling the cutter head part mainly comprises 3 methods of opening the bin under pressure, opening the bin under normal pressure and opening the ground vertical shaft. Under-pressure or normal-pressure opening is special operation in an underground closed space with extremely high risk, safety accidents occur occasionally, and the overhauling operation in front of the cutter head cannot be completed. The ground shaft opening method changes the property of the operation of opening a cabin closed space in a tunnel, but the construction period for excavating the conventional shaft is long and the cost is high.
The existing manual hole digging shield maintenance well generally adopts a manual pipe digging well, the pipe well is easy to collapse and needs a protection wall, a reinforcement cage is tied up in the pipe well, a formwork is supported, then concrete pouring is carried out, and the construction efficiency is low.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a shield construction overhauling device, so that the problems in the prior art are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a shield construction overhauling device comprises a mounting rod, wherein two ends of the mounting rod are respectively provided with a square hole, each square hole is internally and slidably connected with a square rod, the end of each square rod is provided with a first idler wheel, each square rod is fixedly connected with a first vertical plate, two ends of the mounting rod are respectively and fixedly connected with a second vertical plate, the first vertical plates and the second vertical plates are oppositely arranged, the second vertical plates are provided with first threaded holes, the first threaded holes are internally and rotatably connected with threaded rods, one ends of the threaded rods are rotatably connected with the first vertical plates, and the other ends of the threaded rods are fixedly connected with hand wheels;
the utility model discloses a cutting tool, including installation pole, round bar, screw rod, cutting device, installation pole, cutting device, every cutting device, first hanger plate fixed connection are equipped with a cutting device respectively at the downside both ends of installation pole, and every cutting device all includes first hanger plate, and first hanger plate fixed connection is in installation pole bottom, rotate on the first hanger plate and connect the round bar, round bar one end is equipped with the second screw hole, second screw hole internal thread connection screw rod, the square post of one end fixed connection of round bar is kept away from to the screw rod, installation pole bottom fixed connection second hanger plate is equipped with square sliding hole on the second hanger plate, and square post passes and sliding connection, square post one.
Preferably, a synchronous rod is fixedly connected between the round rods of the two cutting devices, and the middle part of the synchronous rod is fixedly connected with a rotating wheel.
Preferably, the second hanger plate is fixedly connected with a supporting block, the supporting block is provided with a sliding hole, the cross section of the sliding hole is square, the sliding hole is internally connected with a sliding rod in a sliding manner, a supporting spring is fixedly connected between the sliding rod and the hole bottom of the sliding hole, the other end of the sliding rod is provided with a second roller, the bottom of the supporting block is provided with a rotating groove, the rotating groove is communicated with the sliding hole, the rotating groove is rotatably connected with a swinging plate, a hook spring is arranged between one side of the swinging plate and the bottom of the supporting block, the bottom of the sliding rod is fixedly connected with a stirring plate, the stirring plate corresponds to the upper end of the swinging plate and is arc-shaped, and the swinging plate and the cutter are arranged in a staggered manner and are positioned inside.
Preferably, the opposite both sides of swing board are equipped with an circular arc shrinkage pool respectively, rotate fixed connection rubber pole on the relative inside wall of groove, the end of rubber pole sets to the hemisphere type, the rubber pole corresponds the setting with the circular arc shrinkage pool.
Preferably, two opposite sides of the mounting rod are respectively fixedly connected with a handle, and the two handles are arranged in a central symmetry mode by taking the mounting rod as a reference.
The invention has the advantages that: according to the shield construction overhaul device provided by the invention, the shifting plate pushes the swinging plate to swing through the periodic reciprocating motion of the sliding rod, the cutter is arc-shaped, the excavated soil is enabled to be in a sheet-shaped curled shape and to slide along the arc-shaped surface to be guided to the direction of the circle center of the pipe body by the arc-shaped cutter, the swinging plate and the cutter are arranged in a staggered manner and are positioned inside a virtual circle formed by the cutter, the periodic swinging of the swinging plate breaks off the cut sheet-shaped soil strips on one hand to facilitate the transfer of muck on the other hand, the swinging plate has a pushing action on the excavated soil layer to enable the excavated soil pieces to move out of the lower part of the pipe body, and the muck.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at F;
fig. 3 is a basic structure diagram of the tube pile of the present invention;
fig. 4 is a partial enlarged view at E in fig. 3;
FIG. 5 is a front view of the present invention;
FIG. 6 is a partial enlarged view at H in FIG. 5;
FIG. 7 is a sectional view A-A of FIG. 6;
fig. 8 is a sectional view B-B in fig. 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and 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.
Example 1
As shown in fig. 1-8, the shield construction overhaul device provided by the invention comprises a mounting rod 21, wherein two ends of the mounting rod 21 are respectively provided with a square hole, each square hole is slidably connected with a square rod 22, the end of each square rod 22 is provided with a first roller 23, each square rod 22 is fixedly connected with a first vertical plate 24, two ends of the mounting rod 21 are respectively fixedly connected with a second vertical plate 25, the first vertical plate 24 and the second vertical plate 25 are oppositely arranged, the second vertical plate 25 is provided with a first threaded hole, the first threaded hole is connected with a threaded rod 26 in a threaded manner, one end of the threaded rod 26 is rotatably connected with the first vertical plate 24, and the other end of the threaded rod 26 is fixedly connected with a hand wheel 27.
Installing rod 21's downside both ends are equipped with a cutting device 3 respectively, every cutting device 3 all includes first hanger plate 31, first hanger plate 31 fixed connection is in installing rod 21 bottom, rotate on the first hanger plate 31 and connect round bar 32, round bar 32 one end is equipped with the second screw hole, second screw hole internal thread connection screw rod 33, round bar 32's one end fixed connection square post 34 is kept away from to screw rod 33, installing rod 21 bottom fixed connection second hanger plate 35, be equipped with square sliding hole on the second hanger plate 35, square post 34 passes and sliding connection in by square sliding hole, 34 one end fixed connection cutters 36 of square post.
The device is used for a tubular pile, the tubular pile comprises a pipe body 1, a first annular groove 11 is arranged at the upper end of the excircle of the pipe body 1, the first annular groove 11 is concentric with the pipe body 1, a second annular groove 12 is arranged at the lower end of the excircle of the pipe body 1, a soil cutting annular ring 13 is fixedly connected in the second annular groove 12, the cross section of the soil cutting annular ring 13 is L-shaped, the outer diameter of the soil cutting annular ring 13 is equal to the outer diameter of the pipe body 1, the soil cutting annular ring 13 is arranged opposite to the first annular groove 11, the lower end surface of the soil cutting annular ring 13 is higher than the lower end surface of the pipe body 1, a third annular groove 14 is arranged on the inner circular surface of the pipe body 1, when the device is used, a threaded rod 26 is screwed in relative to, a corresponding square rod 22 protrudes in the square hole and snaps the first roller 23 into the third annular groove 14, so that the mounting rod 21 can be quickly mounted in the diameter direction of the pipe body 1 for circular cutting of the soil layer below the pipe body 1.
Specifically, the support ring 5 is fixedly connected to the inside of the pipe body 1, a plurality of threaded lifting holes 51 are arranged on the upper side of the support ring 5 at intervals, a plurality of avoiding holes 52 are formed in the upper end of the pipe body 1, the avoiding holes 52 and the threaded lifting holes 51 are arranged in a one-to-one correspondence mode, and a plurality of auxiliary lifting holes 53 are further formed in the inner wall of the pipe body 1.
Specifically, dodge the hole 52 upper end and be equipped with the chamfer, the fixedly connected with plugboard 54 of pre-buried formula on 1 of body, 1 downside of body is equipped with the spliced eye, spliced eye and plugboard 54 looks adaptation are equipped with the counter bore of intercommunication body 1 inner wall on the inner wall of spliced eye, can splice two upper and lower equal specification's body 1 through the bolt fastening to plugboard 54 on making, form the auxiliary connection.
Specifically, a synchronous rod 37 is fixedly connected between the round rods 32 of the two cutting devices 3, and a rotating wheel 38 is fixedly connected in the middle of the synchronous rod 37. By rotating the round rod 32, the screw 33 moves relative to the round rod 32, so that the cutter 36 moves along the axial direction of the mounting rod 21, the cutter 36 cuts into the soil layer and adjusts the feeding amount in real time, the mounting rod 21 is pushed to do circular motion in the pipe body 1, and the cutter 36 excavates the soil between the lower part of the pipe body 1 and the soil cutting ring 13.
Specifically, a supporting block 4 is fixedly connected to the second hanging plate 35, a sliding hole 41 is formed in the supporting block 4, the cross section of the sliding hole 41 is square, a sliding rod 42 is slidably connected to the sliding hole 41, a supporting spring 43 is fixedly connected between the sliding rod 42 and the bottom of the sliding hole 41, a second roller 44 is mounted at the other end of the sliding rod 42, an annular wavy groove 15 is formed in the inner wall of the pipe body 1, the wavy groove 15 is correspondingly arranged on a rolling path of the second roller 44, the supporting spring 43 is supported, a rotating groove 45 is formed in the bottom of the supporting block 4, the rotating groove 45 is communicated with the sliding hole 41, the rotating groove 45 is connected with a swinging plate 46, a hook spring 47 is mounted between one side of the swinging plate 46 and the bottom of the supporting block 4, the hook spring 47 plays a role in supporting and providing tension, a poking plate 48 is fixedly connected to the bottom of the sliding rod 42, the upper end of swing board 46 is equipped with the transition circular arc, make setting plate 48 can be slided to the opposite side by one side of swing board 46 upper end, slide bar 42 periodic reciprocating motion makes setting plate 48 promote swing board 46 to swing, cutter 36 is the arc, curved cutter 36 makes the soil of digging out be the direction of slice curl shape and slide direction to the body 1 centre of a circle along the arcwall face, swing board 46 and cutter 36 dislocation set just are located inside the virtual circle that cutter 36 formed, swing board 46 periodic swing breaks the flaky soil strip of cutting out on the one hand, be convenient for transport the dregs, on the other hand swing board 46 forms the propelling movement effect to digging the soil layer, make the soil piece of digging out shift out the below of body 1, be convenient for the clearance of dregs.
Specifically, the two opposite sides of the swing plate 46 are respectively provided with an arc concave hole 461, the inner side wall opposite to the rotating groove 45 is fixedly connected with a rubber rod 462, the end of the rubber rod 462 is arranged in a hemispherical shape, the rubber rod 462 and the arc concave hole 461 are correspondingly arranged, when the rubber rod 462 is arranged in the arc concave hole 461, the poking plate 48 needs to push the swing plate 46 to swing, after the rubber rod 462 is separated from the arc concave hole 461, the swing plate 46 swings fast by matching with the elastic force of the hook spring 47, so that the cut soil piece can be thrown up, the dug soil piece is moved out of the lower part of the pipe body 1, and the residue soil is convenient to clean.
Specifically, two opposite sides of the mounting rod 21 are respectively and fixedly connected with a handle 211, the two handles 211 are arranged in a central symmetry mode by taking the mounting rod 21 as a reference, and two workers can stand by one person to conveniently push the mounting rod 21 to rotate around the center of the mounting rod.
The concrete construction steps of the tubular pile are as follows:
(1) the pipe body 1 is hoisted to a construction position, after the soil cutting circular ring 13 at the bottom of the pipe body 1 is pressed into a soil layer under the self weight of the pipe body 1, the pipe body 1 is kept in a suspension state, and constructors enter the pipe body 1 to manually excavate an excavation surface;
(2) hoisting the installation rod 21 into the pipe body 1, aligning the first roller 23 with the third annular groove 14, rotating the threaded rod 26 to clamp the first roller 23 into the third annular groove 14, embedding the cutter 36 into the soil layer below the pipe body 1 after rotating the synchronizing rod 37, rotating the installation rod 21 to perform circular cutting on the soil layer below the pipe body 1 by taking the circle center of the pipe body 1 as a reference, and rotating the synchronizing rod 37 to adjust the feeding amount until the cutter 36 contacts the soil cutting circular ring 13;
(3) after the soil layer below the pipe body 1 is removed and the cutter 36 is retracted, the pipe body 1 with the same specification is stacked at the upper end of the pipe body 1, and the soil cutting circular ring 13 at the bottom of the pipe body 1 is pressed into the soil layer of the next layer under the self weight of the pipe body 1;
(4) and (4) circularly repeating the steps 1-3 until the designed elevation is reached.
During operation, the round rod 32 is rotated, the screw 33 moves relative to the round rod 32, so that the cutter 36 moves along the axial direction of the mounting rod 21, the cutter 36 cuts into the soil layer and adjusts the feeding amount in real time, the mounting rod 21 is pushed to do circular motion in the pipe body 1, and the cutter 36 excavates the soil between the lower part of the pipe body 1 and the soil cutting ring 13.
Slide bar 42 periodic reciprocating motion makes the setting aside board 48 promote the swing of swinging plate 46, cutter 36 is the arc, curved cutter 36 makes the soil of digging out be the slice curl shape and along the direction of arcwall face slip direction to the body 1 centre of a circle, swinging plate 46 and cutter 36 dislocation set just are located inside the virtual circle that cutter 36 formed, the periodic swing of swinging plate 46 breaks the flaky soil strip of cutting out on the one hand, be convenient for transport the dregs, on the other hand swinging plate 46 forms the propelling movement effect to digging the soil layer, make the soil piece of digging shift out the below of body 1, be convenient for the clearance of dregs.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a shield constructs construction and overhauls device, includes installation pole (21), its characterized in that: the two ends of the mounting rod (21) are respectively provided with a square hole, each square hole is internally and slidably connected with a square rod (22), the end of each square rod (22) is provided with a first idler wheel (23), each square rod (22) is fixedly connected with a first vertical plate (24), the two ends of the mounting rod (21) are respectively and fixedly connected with a second vertical plate (25), the first vertical plate (24) and the second vertical plate (25) are oppositely arranged, the second vertical plate (25) is provided with a first threaded hole, the first threaded hole is in threaded connection with a threaded rod (26), one end of the threaded rod (26) is rotatably connected with the first vertical plate (24), and the other end of the threaded rod (26) is fixedly connected with a hand wheel (27);
the utility model discloses a cutting device, including installation pole (21), rotation connection pole (32) on first hanger plate (31), the downside both ends of installation pole (21) are equipped with one cutting device (3) respectively, and every cutting device (3) all include first hanger plate (31), and first hanger plate (31) fixed connection is in installation pole (21) bottom, rotate connection pole (32) on first hanger plate (31), pole (32) one end is equipped with the second screw hole, second screw hole female connection screw rod (33), the square post of one end fixed connection (34) of pole (32) is kept away from in screw rod (33), installation pole (21) bottom fixed connection second hanger plate (35) are equipped with square slide opening on second hanger plate (35), and square post (34) are passed and sliding connection, square post (34) one end fixed connection cutter (36) by square slide opening.
2. The shield construction overhaul device according to claim 1, wherein: a synchronous rod (37) is fixedly connected between the round rods (32) of the two cutting devices (3), and the middle part of the synchronous rod (37) is fixedly connected with a rotating wheel (38).
3. The shield construction overhaul device according to claim 1, wherein: the second hanging plate (35) is fixedly connected with a supporting block (4), a sliding hole (41) is formed in the supporting block (4), the cross section of the sliding hole (41) is square, a sliding rod (42) is connected in the sliding hole (41) in a sliding mode, a supporting spring (43) is fixedly connected between the sliding rod (42) and the hole bottom of the sliding hole (41), a second roller (44) is installed at the other end of the sliding rod (42), a rotating groove (45) is formed in the bottom of the supporting block (4), the rotating groove (45) is communicated with the sliding hole (41) and is arranged, the rotating groove (45) is rotatably connected with a swinging plate (46), a hook spring (47) is installed between one side of the swinging plate (46) and the bottom of the supporting block (4), a shifting plate (48) is fixedly connected to the bottom of the sliding rod (42), and the shifting plate (48) is arranged corresponding to the upper end of the swinging, the cutter (36) is arc-shaped, and the swinging plate (46) and the cutter (36) are arranged in a staggered mode and are located inside a virtual circle formed by the cutter (36).
4. The shield construction overhaul device according to claim 3, wherein: the two opposite sides of the swing plate (46) are respectively provided with an arc concave hole (461), the inner side wall opposite to the rotation groove (45) is fixedly connected with a rubber rod (462), the end of the rubber rod (462) is arranged to be hemispherical, and the rubber rod (462) is correspondingly arranged with the arc concave hole (461).
5. The shield construction overhaul device according to claim 1, wherein: the two opposite sides of the mounting rod (21) are respectively fixedly connected with a handle (211), and the two handles (211) are arranged in a centrosymmetric mode by taking the mounting rod (21) as a reference.
CN202010768247.3A 2020-08-03 2020-08-03 Shield construction maintenance device Withdrawn CN112031797A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010768247.3A CN112031797A (en) 2020-08-03 2020-08-03 Shield construction maintenance device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010768247.3A CN112031797A (en) 2020-08-03 2020-08-03 Shield construction maintenance device

Publications (1)

Publication Number Publication Date
CN112031797A true CN112031797A (en) 2020-12-04

Family

ID=73582187

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010768247.3A Withdrawn CN112031797A (en) 2020-08-03 2020-08-03 Shield construction maintenance device

Country Status (1)

Country Link
CN (1) CN112031797A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110284885A (en) * 2019-06-24 2019-09-27 中铁十二局集团有限公司 Shield inspection-pit construction method
CN111155524A (en) * 2020-01-27 2020-05-15 潘卫东 Shield constructs pile pulling device that construction was worn district

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110284885A (en) * 2019-06-24 2019-09-27 中铁十二局集团有限公司 Shield inspection-pit construction method
CN111155524A (en) * 2020-01-27 2020-05-15 潘卫东 Shield constructs pile pulling device that construction was worn district

Similar Documents

Publication Publication Date Title
CN213233477U (en) Foundation pit supporting structure and foundation pit slope supporting system
CN108729922B (en) Push bench and retractable push bench construction method
CN111520539B (en) Device for jacking construction of pipeline
CN109653682A (en) Bore the adjustable drill bit of diameter and hole digging machine
CN111156026A (en) Active support prefabricated secondary lining for shield tunnel and manufacturing method thereof
CN112031797A (en) Shield construction maintenance device
CN110453961B (en) Portable emergency composite material telegraph pole
JP3361776B2 (en) Crushing equipment for underground piles
CN115538520B (en) Desilting device for hydraulic engineering
CN103334433B (en) A kind of construction method of pile pulling
CN214836083U (en) Drilling tool for casing drill pipe
CN212534131U (en) Auxiliary inclined supporting device for foundation pit
CN112064631B (en) Artificial vertical shaft tubular pile and tubular pile construction process
CN212927015U (en) Building engineering construction is with pouring template
CN209903096U (en) Hydraulic puller for removing coal machine cutting teeth and tooth shoes
CN211647234U (en) Overhanging type scaffold
CN202812462U (en) Detachable intermediate relaying jacking station hydraulic cylinder steel support
CN209483357U (en) A kind of opened type shield machine for jacking construction
CN201857901U (en) Telescopic drill rod and cast-in-situ cylinder pile rotary drilling rig utilizing same
CN211201976U (en) Pipe jacking and shield tunneling integrated machine
CN215290116U (en) Pile pulling part for pile pulling machine
CN216447532U (en) Excavation type pipe jacking and deviation rectifying device for municipal construction
CN214738117U (en) Super high-rise building foundation pit supporting structure
CN219974493U (en) Novel splitter
CN112064640B (en) Pile driver of split combined type full pile casing and construction process thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20201204