CN112276248B - Method for dismantling box type derrick - Google Patents
Method for dismantling box type derrick Download PDFInfo
- Publication number
- CN112276248B CN112276248B CN202011201268.3A CN202011201268A CN112276248B CN 112276248 B CN112276248 B CN 112276248B CN 202011201268 A CN202011201268 A CN 202011201268A CN 112276248 B CN112276248 B CN 112276248B
- Authority
- CN
- China
- Prior art keywords
- box
- platform
- head sheave
- hoisting
- cross beam
- 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.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
Abstract
The embodiment of the invention provides a method for dismantling a box-type derrick, which comprises the steps of calculating the weight of each component contained in the box-type derrick; dividing the box-type derrick into a plurality of dismantling units according to the weight of each component, and marking the dismantling sequence of each dismantling unit; selecting the truck crane according to the maximum weight of each dismantling unit and the height of the box-type derrick; and sequentially cutting the dismantling units according to the dismantling sequence, and hoisting the dismantled dismantling units to the ground by using the automobile crane, thereby realizing the safe and quick dismantling of the box-type derrick.
Description
Technical Field
The invention relates to the technical field of derrick dismantling, in particular to a dismantling method of a box-type derrick.
Background
At present, with the popularization of the national policy of going to production, more and more old mines are shut down and switched to production. With the shutdown of the old mine, the mine equipment in the old mine is left unused, resulting in resource waste.
Therefore, how to safely and efficiently dismantle and recover the mine equipment in the old mine is also a new problem.
Disclosure of Invention
The embodiment of the invention provides a method for dismantling a box-type derrick, which aims to achieve the technical effect of dismantling the box-type derrick concisely, safely and quickly.
In one aspect of the implementation of the invention, a method for dismantling a box-type derrick is provided, and the method is characterized by comprising the following steps:
calculating the weight of each component contained in the box-type derrick;
dividing the box-type derrick into a plurality of dismantling units according to the weight of each component, and marking the dismantling sequence of each dismantling unit;
selecting the truck crane according to the maximum weight of each dismantling unit and the height of the box-type derrick;
and sequentially cutting the dismantling units according to the dismantling sequence, and hoisting the dismantled dismantling units to the ground by using an automobile crane.
Optionally, the process of dividing the box-type derrick into a plurality of dismantling units according to the weight of each member includes:
calculating whether the gravity center of the rest part of the box-type derrick is in an area formed by all supporting points of the box-type derrick after the selected member is removed;
if yes, the selected component is taken as a dismantling unit;
if not, reselecting the component; the gravity center of the rest part of the box-type derrick is accurately calculated, the stability of the rest part is determined, the rest part of the derrick is kept in a stable state under the action of external force such as a cable rope, and the dismantling speed is accelerated.
Optionally, the removing unit includes: the lifting platform, the upper head sheave, the lower head sheave, the upper head sheave platform, the lower head sheave platform, the inclined frames at two sides, the connecting beam between the inclined frames at two sides and the vertical frame.
Optionally, the process of sequentially cutting the demolition units according to the demolition order and hoisting the demolition units completed by cutting to the ground by using the truck crane comprises:
after the automobile crane is in place, a hoisting hole is formed in the hoisting platform, the automobile crane hoists the hoisting platform through the hoisting hole, the lower part of the hoisting platform is transversely cut, and the hoisting platform is hoisted to the ground after the cutting is finished;
the automobile crane sequentially lifts and removes the upper head sheave and the lower head sheave;
a hoisting hole is formed in the upper part of the upper head sheave platform, the automobile crane hoists the upper head sheave platform through the hoisting hole, the lower part of the upper head sheave platform is transversely cut, and the upper head sheave platform is hoisted to the ground after the cutting is finished;
a hoisting hole is formed in the connecting cross beam between the inclined frames on the two sides, the automobile crane hoists the connecting cross beam through the hoisting hole, the connecting position of the connecting cross beam and the inclined frames on the two sides is longitudinally cut, and the connecting cross beam is hoisted to the ground after the cutting is finished;
longitudinally cutting the lower head sheave platform and a box-type cross beam connected with the lower part of the lower head sheave platform, hoisting the lower head sheave platform and the box-type cross beam on one side by using an automobile crane after cutting, removing a bolt for connecting the inclined frame and the vertical frame on the side, removing a foundation bolt of the inclined frame on the side, and hoisting the head sheave platform, the box-type cross beam and the inclined frame by using the automobile crane and lowering the head sheave platform, the box-type cross beam and the inclined frame to the ground;
the automobile crane hoists the other side lower head sheave platform and the box-type cross beam, the bolts connecting the side inclined frame and the vertical frame are removed, the foundation bolts of the side inclined frame are removed, and the automobile crane hoists the side head sheave platform, the box-type cross beam and the inclined frame and lowers the side head sheave platform, the box-type cross beam and the inclined frame to the ground;
and transversely segmenting the vertical frame, and hoisting and lowering the vertical frame to the ground through a truck crane for disintegration.
Optionally, the number of the mobile cranes is two, and the two mobile cranes are symmetrically distributed on two sides of the box-type derrick.
According to the scheme provided by the embodiment of the invention, the automobile crane is used as hoisting equipment, the structural characteristics of the box-type derrick are combined, the weight of the box-type derrick is calculated in a segmented manner, the box-type derrick is divided and disassembled, the structure stability of the box-type derrick is ensured during dismantling, and the safe and quick dismantling of the box-type derrick is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a box-type derrick according to an embodiment of the invention;
fig. 2 is a schematic diagram illustrating a partition of a box-type derrick demolition unit according to an embodiment of the invention;
FIG. 3 is a schematic view of the remaining portion of a box-type derrick crane platform according to an embodiment of the invention after removal;
FIG. 4 is a schematic view of the remaining part of a box-type derrick according to an embodiment of the present invention after the upper and lower head sheaves are removed;
FIG. 5 is a schematic view of the remaining part of a box-type derrick where a head sheave platform is removed according to an embodiment of the present invention;
FIG. 6 is a schematic view of the remaining portion of a box-type derrick connecting beam provided in an embodiment of the invention after being removed;
FIG. 7 is a schematic view of a portion of a box-type derrick according to an embodiment of the invention after a side ramp is removed;
fig. 8 is a schematic diagram of a remaining portion of the box-type derrick according to the embodiment of the invention after the inclined frame on the other side of the box-type derrick is removed.
In the figure, a stand 1; an anti-collision beam 2; a lower head sheave platform 3; an upper head sheave platform 4; a hoisting platform 5; an upper head sheave 6; a lower head sheave 7; a ramp 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The invention provides a method for dismantling a box-type derrick, which comprises the following steps:
the method comprises the following steps: the weight of each component contained by the box-type derrick is calculated.
In practice, the weight of the components may be calculated from the dimensions, materials of the various components. As shown in fig. 1, a schematic structural diagram of a box-type derrick according to an embodiment of the present invention is shown, in which the box-type derrick includes: the weight of the vertical frame 1, the anti-collision beam 2, the lower head sheave platform 3, the upper head sheave platform 4, the hoisting platform 5, the upper head sheave 6, the lower head sheave and the inclined frame 8, and the box-type derrick part components G101-G109 are as follows:
| serial number | Name (R) | Single weight (kg) | Total weight (kg) |
| 1 | G101*2 | 8391.5 | 16783 |
| 2 | G102*2 | 11853.2 | 23706.4 |
| 3 | G103*2 | 12227.5 | 24455 |
| 4 | G104*2 | 18895.8 | 37791.6 |
| 5 | G105*1 | 12620 | 12620 |
| 6 | G106*1 | 12456 | 12456 |
| 7 | G107*2 | 6871.7 | 13743.4 |
| 8 | G108*1 | 6664.8 | 6664.8 |
| 9 | G109*1 | 4504.2 | 4504.2 |
Step two: the box-type derrick is divided into a plurality of demolition units according to the weight of each member, and the demolition order of each demolition unit is marked.
In practice, the process of dividing the box-type derrick into a plurality of demolition units, depending on the weight of the individual components, comprises:
calculating whether the gravity center of the rest part of the box-type derrick is in an area formed by all supporting points of the box-type derrick after the selected member is removed; if yes, the selected component is taken as a dismantling unit; if not, the component is reselected.
The center of gravity of the rest part of the box-type derrick is accurately calculated, the stability of the rest part is determined, the dismantling unit division is scientific and reasonable, the rest part of the derrick is kept in a stable state under the action of external force such as a cable rope, and the dismantling speed is accelerated.
As shown in fig. 2, a schematic diagram of a partition of a box-type derrick demolishing unit provided in an embodiment of the present invention is shown, specifically, the demolishing unit may include: the lifting platform, the upper head sheave, the lower head sheave, the upper head sheave platform, the lower head sheave platform, the inclined frames at two sides, the connecting beam between the inclined frames at two sides and the vertical frame.
Step three: the mobile crane is selected according to the maximum weight of the respective demolition unit and the height of the box-type derrick.
Continuing to take the weight in the table as an example:
maximum weight member ramp portion totals = G101+ G102+ G103+ G104
=8391.5+11853.2+12227.5+18895.8=51368kg, and the self gravity G =513.7kN, based on the above, two 300t automobile cranes can be selected and symmetrically distributed on two sides of the box-type derrick.
Selecting a steel wire rope: the rope buckles of the two automobile cranes are four, and the four ropes are all stressed by G' = G/8;
g' =64.25kN, and each stress G1=77.1kN is calculated by considering each uneven coefficient to be 1.2;
selecting a steel wire rope 6 multiplied by 19 to 44 to 1670, wherein the breaking force P =933kN;
the safety factor K = P/G1=933/77.1=12.1> -8, so that the 6 × 19-44-1670 steel cord is satisfactory.
Step four: and sequentially cutting the dismantling units according to the dismantling sequence, and hoisting the dismantled dismantling units to the ground by using an automobile crane.
Specifically, the method may include:
after the automobile crane is in place, a hoisting hole is formed in the hoisting platform, the automobile crane hoists the hoisting platform through the hoisting hole to transversely cut the lower part of the hoisting platform, the hoisting platform is hoisted to the ground after the cutting is finished, and the rest part after the dismantling is finished is shown in fig. 3; when the hoisting hole is formed, the strength of the hoisting hole needs to be checked, and for example, the hoisting hole can be formed according to the forming rule that the heavier the dismantling unit is and the farther the distance between the hoisting hole and the edge of the dismantling unit is.
The automobile crane sequentially lifts and removes the upper head sheave and the lower head sheave, and the rest part after the removal is completed is shown in figure 4;
and a hoisting hole is formed in the upper part of the upper sheave platform, the automobile crane hoists the upper sheave platform through the hoisting hole, the lower part of the upper sheave platform is transversely cut, the upper sheave platform is hoisted to the ground after the cutting is finished, and the rest part after the dismantling is finished is shown in fig. 5.
And arranging hoisting holes on the connecting cross beam between the inclined frames at the two sides, hoisting the connecting cross beam by the automobile crane through the hoisting holes, longitudinally cutting the joint of the connecting cross beam and the inclined frames at the two sides, hoisting the connecting cross beam to the ground after the cutting is finished, and removing the rest part after the removal is finished as shown in fig. 6.
Longitudinally cutting the lower head sheave platform and the box-type cross beam connected with the lower part of the lower head sheave platform, hoisting the lower head sheave platform and the box-type cross beam on one side by the automobile crane after cutting, dismantling the bolt for connecting the inclined frame and the vertical frame on the side, dismantling the foundation bolt of the inclined frame on the side, hoisting the head sheave platform, the box-type cross beam and the inclined frame on the side by the automobile crane and lowering to the ground, wherein the rest part after dismantling is shown in figure 7.
The automobile crane suspends the lower head sheave platform and the box-type cross beam on the other side, the bolts connecting the inclined frame and the vertical frame on the side are removed, the foundation bolts of the inclined frame on the side are removed, the automobile crane lifts the head sheave platform, the box-type cross beam and the inclined frame on the side and puts the same to the ground, and the rest after the removal is completed is shown in fig. 8. The inclined legs on the two sides are longitudinally separated to be dismantled, the size of the component is reduced, the required construction site is reduced, and the working efficiency is improved.
The automobile crane lifts the vertical frame and puts the vertical frame to the ground for disintegration. In the process of dismantling the vertical frame, the anti-collision beam of the vertical frame and the upper platform can be dismantled integrally, and the rest steel structure of the vertical frame is cut in sections, dismantled and transferred to the ground for disintegration.
When the member is hoisted by using the hoisting hole, the member can be hoisted by using the connection of the shackle and the wire rope buckle.
In-process cutting the component, can set up the manhole at the box surface of box derrick, in the staff followed the manhole entering box, stand and cut on the baffle of box inside, the staff gets into the inside cutting operation that carries out of box derrick, compare in cutting the derrick outside the box derrick, the cutting position is more accurate, high efficiency, can not cut the inside enhancement baffle of box, the construction operation is safer, reduce the required auxiliary work of outside operation, reach the mesh of dismantling the derrick in the air.
According to the scheme provided by the embodiment of the invention, the automobile crane is used as hoisting equipment, the structural characteristics of the box-type derrick are combined, the weight of the box-type derrick is calculated in a segmented manner, the box-type derrick is reasonably divided and disassembled, the structure stability of the box-type derrick is ensured during dismantling, and the safe and quick dismantling of the box-type derrick is realized.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (3)
1. A method of demolishing a box-type derrick, the method comprising:
calculating the weight of each component contained in the box-type derrick;
dividing the box-type derrick into a plurality of dismantling units according to the weight of each component, and marking the dismantling sequence of each dismantling unit;
selecting the automobile crane according to the maximum weight of each dismantling unit and the height of the box-type derrick;
sequentially cutting the demolition units according to the demolition sequence, and hoisting the cut demolition units to the ground by using an automobile crane;
the demolition unit includes: the lifting platform, the upper head sheave, the lower head sheave, the upper head sheave platform, the lower head sheave platform, the inclined frames at two sides, the connecting cross beam between the inclined frames at two sides and the vertical frame;
the process that the demolition units are cut in sequence according to the demolition sequence, and the demolition units which are cut by the automobile crane are lifted to the ground comprises the following steps:
after the automobile crane is in place, arranging a hoisting hole on the hoisting platform, hoisting the hoisting platform by the automobile crane through the hoisting hole, transversely cutting the lower part of the hoisting platform, and hoisting the hoisting platform to the ground after the cutting is finished;
the automobile crane sequentially lifts and removes the upper head sheave and the lower head sheave;
a hoisting hole is formed in the upper part of the upper head sheave platform, the automobile crane hoists the upper head sheave platform through the hoisting hole, the lower part of the upper head sheave platform is transversely cut, and the upper head sheave platform is hoisted to the ground after the cutting is finished;
a hoisting hole is formed in the connecting cross beam between the two side inclined frames, the automobile crane hoists the connecting cross beam through the hoisting hole, the connecting position of the connecting cross beam and the two side inclined frames is longitudinally cut, and the connecting cross beam is hoisted to the ground after the cutting is finished;
longitudinally cutting the lower head sheave platform and a box-type cross beam connected with the lower part of the lower head sheave platform, hoisting the lower head sheave platform and the box-type cross beam on one side by using an automobile crane after cutting, removing a bolt for connecting the inclined frame and the vertical frame on the side, removing a foundation bolt of the inclined frame on the side, and hoisting the head sheave platform, the box-type cross beam and the inclined frame by using the automobile crane and lowering the head sheave platform, the box-type cross beam and the inclined frame to the ground;
the automobile crane hoists the other side lower head sheave platform and the box-type cross beam, the bolts connecting the side inclined frame and the vertical frame are removed, the foundation bolts of the side inclined frame are removed, and the automobile crane hoists the side head sheave platform, the box-type cross beam and the inclined frame and lowers the side head sheave platform, the box-type cross beam and the inclined frame to the ground;
and transversely segmenting the vertical frame, and hoisting and lowering the vertical frame to the ground by using a truck crane for disintegration.
2. The demolition method according to claim 1, characterized in that the process of dividing the box-type derrick into a plurality of demolition units according to the weight of each member comprises:
calculating whether the gravity center of the rest part of the box-type derrick is in an area formed by all supporting points of the box-type derrick after the selected member is removed;
if yes, the selected component is taken as a dismantling unit;
if not, the component is reselected.
3. The method as claimed in claim 1, wherein the two mobile cranes are symmetrically arranged on both sides of the box-type derrick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011201268.3A CN112276248B (en) | 2020-11-02 | 2020-11-02 | Method for dismantling box type derrick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011201268.3A CN112276248B (en) | 2020-11-02 | 2020-11-02 | Method for dismantling box type derrick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112276248A CN112276248A (en) | 2021-01-29 |
| CN112276248B true CN112276248B (en) | 2022-12-20 |
Family
ID=74353085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011201268.3A Active CN112276248B (en) | 2020-11-02 | 2020-11-02 | Method for dismantling box type derrick |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112276248B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11303421A (en) * | 1998-04-16 | 1999-11-02 | Mitsubishi Heavy Ind Ltd | Demolition method for steel tower type high-rise chimney |
| RU2209282C1 (en) * | 2001-10-30 | 2003-07-27 | Открытое акционерное общество "Спецжелезобетонстрой" | Method of repair and reconstruction of tall chimneys and partial disassembly of shaft during their reconstruction |
| JP2005226295A (en) * | 2004-02-12 | 2005-08-25 | Miyaji Construction & Engineering Co Ltd | Dismantling method and dismantling device for cylindrical structure |
| JP2006214209A (en) * | 2005-02-04 | 2006-08-17 | Noda Jidosha Kogyosho:Kk | Method of erecting and removing bridge girder, and bridge girder construction apparatus |
| JP2007113376A (en) * | 2005-10-19 | 2007-05-10 | Matsuoka Chiteki Shoyuken Jimusho:Kk | Method of dismantling bridge girder |
| CN105220894A (en) * | 2015-11-16 | 2016-01-06 | 中国华西企业有限公司 | The harmless cutting disassembling structure of inner support rope saw and construction thereof |
| CN106238863A (en) * | 2016-08-17 | 2016-12-21 | 国投新集能源股份有限公司 | A kind of method abolishing the steel borehole wall |
| CN107119584A (en) * | 2017-05-08 | 2017-09-01 | 中建三局基础设施工程有限公司 | A kind of method for dismounting of concrete rigid frame arch bridge |
| CN108678422A (en) * | 2018-05-29 | 2018-10-19 | 五冶集团上海有限公司 | The method for dismounting of steel stack |
| CN110374006A (en) * | 2019-07-22 | 2019-10-25 | 中铁大桥局集团有限公司 | A kind of construction method for removing space opposite sex large-tonnage steel beam bracket |
-
2020
- 2020-11-02 CN CN202011201268.3A patent/CN112276248B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11303421A (en) * | 1998-04-16 | 1999-11-02 | Mitsubishi Heavy Ind Ltd | Demolition method for steel tower type high-rise chimney |
| RU2209282C1 (en) * | 2001-10-30 | 2003-07-27 | Открытое акционерное общество "Спецжелезобетонстрой" | Method of repair and reconstruction of tall chimneys and partial disassembly of shaft during their reconstruction |
| JP2005226295A (en) * | 2004-02-12 | 2005-08-25 | Miyaji Construction & Engineering Co Ltd | Dismantling method and dismantling device for cylindrical structure |
| JP2006214209A (en) * | 2005-02-04 | 2006-08-17 | Noda Jidosha Kogyosho:Kk | Method of erecting and removing bridge girder, and bridge girder construction apparatus |
| JP2007113376A (en) * | 2005-10-19 | 2007-05-10 | Matsuoka Chiteki Shoyuken Jimusho:Kk | Method of dismantling bridge girder |
| CN105220894A (en) * | 2015-11-16 | 2016-01-06 | 中国华西企业有限公司 | The harmless cutting disassembling structure of inner support rope saw and construction thereof |
| CN106238863A (en) * | 2016-08-17 | 2016-12-21 | 国投新集能源股份有限公司 | A kind of method abolishing the steel borehole wall |
| CN107119584A (en) * | 2017-05-08 | 2017-09-01 | 中建三局基础设施工程有限公司 | A kind of method for dismounting of concrete rigid frame arch bridge |
| CN108678422A (en) * | 2018-05-29 | 2018-10-19 | 五冶集团上海有限公司 | The method for dismounting of steel stack |
| CN110374006A (en) * | 2019-07-22 | 2019-10-25 | 中铁大桥局集团有限公司 | A kind of construction method for removing space opposite sex large-tonnage steel beam bracket |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112276248A (en) | 2021-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105442865B (en) | A kind of piecewise method for dismounting of high chimney and its equipment | |
| CN108166500A (en) | A kind of cutting disassembling of deep foundation ditch concrete near a river and recovery method | |
| CN108678422B (en) | Method for dismantling steel chimney | |
| CN109235290A (en) | Bridge peace tears construction method open | |
| CN104727236B (en) | A kind of whole bridge beam based on ground supports transfers the construction method of dismounting system | |
| CN104652298B (en) | A kind of whole dismounting system and construction method thereof transferred across box beam supported based on bridge floor | |
| CN105442866B (en) | Protective demolition and installation method for large-scale highrise steel structure | |
| CN106812328A (en) | The overall two step lifting construction methods of a string prestressed steel structure rack with hanging layer | |
| CN106192781A (en) | The method for dismounting of prestressing force list case three Room plate-girder | |
| CN211226089U (en) | Continuous jacking and joint adding operation mechanism of tower crane | |
| CN113348289B (en) | Multi-column wind turbine tower and erection method | |
| CN112276248B (en) | Method for dismantling box type derrick | |
| CN101109028A (en) | Method of upside-down mounting hydraulic pressure lifting of converter shell | |
| CN208167536U (en) | A kind of operation platform removed for bridge temporary support | |
| CN111979935A (en) | Dismantling construction method for bridge superstructure | |
| CN111622117A (en) | Method for dismantling small-clear-distance bailey bracket | |
| CN111535190A (en) | Bridge mounting and dismounting construction method with high safety | |
| CN108545629B (en) | Utilize the construction method of tower crane lifting girder truss | |
| CN110984005B (en) | Construction method for dismantling and hoisting No. 0 block of bridge | |
| CN213062871U (en) | Cage for high-altitude scaffold dismantling operation | |
| CN211712507U (en) | Demolish overhead hoist of concrete bridge anticollision barrier | |
| CN105298500B (en) | The method of headframe is changed to by steel headframe suitable for underground mining lifting system | |
| CN111392589A (en) | Lifting and transporting device for attached dismantling of concrete support beam and use method | |
| CN114541286B (en) | Sectional block dismantling construction method for cast-in-situ prestressed box girder | |
| CN217756530U (en) | Lifting device for floor without back jacking |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |