CN115233830A - Construction method of net rack starting unit for middle lifting arch - Google Patents
Construction method of net rack starting unit for middle lifting arch Download PDFInfo
- Publication number
- CN115233830A CN115233830A CN202210537605.9A CN202210537605A CN115233830A CN 115233830 A CN115233830 A CN 115233830A CN 202210537605 A CN202210537605 A CN 202210537605A CN 115233830 A CN115233830 A CN 115233830A
- Authority
- CN
- China
- Prior art keywords
- net rack
- support
- ground
- crane
- unit
- 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
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B2001/3577—Extraordinary methods of construction, e.g. lift-slab, jack-block prefabricating a building and moving it as a whole to the erection site
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/35—Extraordinary methods of construction, e.g. lift-slab, jack-block
- E04B2001/3588—Extraordinary methods of construction, e.g. lift-slab, jack-block using special lifting or handling devices, e.g. gantries, overhead conveying rails
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
A method for constructing a net rack starting unit of a middle lifting arch comprises the steps of selecting a section of net rack in a span, assembling the net rack on the ground, lifting the net rack by using 4 cranes, assembling the net rack from the span to two ends simultaneously, extending the net rack to supports at the two ends to form a stable arch structure, and installing the subsequent net rack by using the unit as a construction platform and adopting a high-altitude bulk method. Firstly, selecting a starting unit position, selecting the middle axis position of the whole net rack as much as possible, selecting a proper crane and a proper sling, firstly assembling unit components on the ground, symmetrically installing the net racks from the middle grid position to two sides, always keeping two sides close to the ground in the installation process, locally extending the hanging point position for reinforcement treatment, integrally lifting and hanging the arched net rack to a support after the arched net rack is installed to the ball position of the support, then respectively arranging three cable wind ropes on two sides, and adjusting the tension degree by using a chain block, thus finishing the middle lifting and hanging arching, reducing high-altitude operation, and being safer and high in installation efficiency.
Description
Technical Field
The invention relates to a hoisting technology, in particular to a construction method of a net rack starting unit for lifting an arch by a middle lifting crane.
Background
The arching net rack has a plurality of technical difficulties in installation and construction, large field workload and no good solution.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for constructing a starting unit of a middle lifting arch, which is relatively safe and improves the installation efficiency.
The invention aims to solve the technical problem by the following technical scheme, and discloses a construction method of a net rack starting unit for lifting an arch by lifting in the middle, which is characterized by comprising the following specific steps of:
preparation for starting
Rechecking the short column foundation, measuring the axial dimension, elevation and position of the embedded part, and rechecking according to the design and specification requirements; the rod pieces and the bolt balls are transported to the designated positions according to the plan, the unit cones are assembled, the crane, the sling, the cable rope and the ground anchor are prepared in place, and the ground anchor can be provided with a fixed ground anchor or a movable ground anchor;
the preparation of advance approach is carried out,
ground assembly and positioning
Before ground assembly, a lifting point projection point position is released on the ground, so that the position deviation of the assembled net rack is controlled within 0.5m, and the influence on the subsequent overall lifted crane station position is prevented. When assembling the ground, continuously assembling the unit cones from one end to the other end, hoisting the assembled end off the ground by using a crane, manually installing the unit cones, hoisting the unit cones by using the crane in a heavier way, and timely replacing the hoisting point position of the crane for hoisting the scaffold along with the assembling progress;
is lifted to be assembled at two ends
After 24 grids are assembled on the ground, the net rack is hoisted by four 160-ton cranes, two hoisting unit cones of 25-ton cranes are respectively arranged at two ends, and each row of grids are installed, and the end parts are hoisted by one grid height so as to facilitate the subsequent installation;
launch unit seating and reinforcement
After all the grids are assembled, the grid support is put in place, and the grid support can enter the inner side of the column top short column and is put in place by adopting a mode that cranes at two ends slowly fall in turn;
(1) when the lifting hook falls down, when the support is close to the top of the post-top short column, the position of the axis of the net rack is roughly adjusted;
(2) finely adjusting the axis of the net rack when the distance between the support and the embedded part at the top of the column ranges from 90 to 110mm;
(3) slowly dropping the crane at the end A, and moving the suspension arm to enable the support to be attached to the embedded part of the column top short column to slowly drop until the support falls onto the embedded part when the bottom of the support is 15 to 25mm away from the horizontal embedded part of the column top;
(4) the lifting hook at the end A continuously and slowly falls, the support at the end B slowly moves outwards under the action of the net rack dead weight, when the support at the end B is 15 to 25mm away from the short column embedded part, the crane at the end A stops falling, the crane at the end B starts to slowly fall until the support is in place, and the support automatically presses close to the short column embedded part at the outer side under the action of the structural dead weight;
(5) and (4) adding safety facilities: after the starting unit is in place, two guy cables are pulled on two sides of the net rack, grids at the support positions at the two ends A and B are installed and widened, and starting installation is completed.
Compared with the prior art, the middle lifting arch is basically installed close to the ground, so that overhead operation is reduced, the installation efficiency is improved, the risk is reduced, the installation period is shortened, and the project cost is saved.
Drawings
FIG. 1 is a schematic view of a mid-span grid structure;
FIG. 2 is a top view of the structure of FIG. 1;
FIG. 3 is a structural diagram of the lifting span in which the net rack does not fall to the ground and the two ends of the net rack complete the installation of the rest grids in sequence until the installation is completed to the support;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a view of the installation structure extending to both sides of the two-end support grids;
fig. 6 is a view showing a structure for carrying out the subsequent high-altitude bulk loading.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, and in order to make those skilled in the art understand the present invention further, the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A construction method of a net rack starting unit for lifting an arch by a middle lifting crane comprises the following specific steps:
preparation for starting
Rechecking the short column foundation, measuring the axial dimension, elevation and position of the embedded part, and rechecking according to design and standard requirements; the rod piece and the bolt ball are transported to the designated position according to the plane plan, the unit cones are assembled, the crane, the sling, the cable rope and the ground anchor are prepared in place, and the ground anchor can be provided with a fixed ground anchor or a movable ground anchor;
the preparation of advance approach is carried out,
ground assembly and positioning
Before ground assembly, a lifting point projection point position is released on the ground, so that the position deviation of the assembled net rack is controlled within 0.5m, and the influence on a subsequent crane station for integral lifting is prevented. When assembling the ground, continuously assembling the unit cones from one end to the other end, hoisting the assembled end off the ground by using a crane, manually installing the unit cones, hoisting the unit cones by using the crane in a heavier way, and timely replacing the hoisting point position of the crane for hoisting the scaffold along with the assembling progress;
is lifted to be assembled at two ends
After 24 grids are assembled on the ground, the net rack is hoisted by four 160-ton cranes, two hoisting unit cones of 25-ton cranes are respectively arranged at two ends, and each row of grids are installed, and the end parts are hoisted by one grid height so as to facilitate the subsequent installation;
launch unit seating and reinforcement
After all grids are assembled, the grid support is put in place by adopting a mode that cranes at two ends fall down slowly in turn, so that the grid support enters the inner side of the column top short column and is put in place;
(1) when the lifting hook falls down, when the support is close to the top of the post-top short column, the position of the axis of the net rack is roughly adjusted;
(2) finely adjusting the axis of the net rack when the distance between the support and the embedded part at the top of the column ranges from 90 to 110mm;
(3) slowly dropping the crane at the end A, and moving the suspension arm to enable the support to be attached to the embedded part of the column top short column to slowly drop until the support falls onto the embedded part when the bottom of the support is 15 to 25mm away from the horizontal embedded part of the column top;
(4) the lifting hook at the end A continuously and slowly falls, the support at the end B slowly moves outwards under the self-weight action of the net rack, when the distance between the support at the end B and the short column embedded part is 15 to 25mm, the crane at the end A stops falling, the crane at the end B starts to slowly fall until the support is in place, and the support can automatically press close to the short column embedded part on the outer side under the self-weight action of the structure;
(5) and (4) adding safety facilities: after the starting unit is in place, two guy cables are pulled on two sides of the net rack, grids at the support positions at the two ends A and B are installed and widened, and starting installation is completed.
The working principle is that a section of net rack is selected from the midspan, the net rack is assembled on the ground, the net rack is lifted by 4 cranes, the net rack is assembled from the midspan to two ends at the same time and extends to the supports at the two ends to form a stable arch structure, and the follow-up net rack is installed by taking the unit as a construction platform and adopting a high-altitude bulk method. Firstly, selecting a starting unit position, selecting the middle axis position of the whole net rack as much as possible, checking the strength and displacement of a lifting point position according to design, selecting a proper crane and a proper sling tool, firstly assembling unit components on the ground, symmetrically installing the net racks from the middle grid position to two sides, always keeping two sides close to the ground in the installation process, locally extending the lifting point position for reinforcement treatment, integrally lifting and hanging the arched net rack to a support after the arched net rack is installed to the support ball position, then respectively arranging three cable wind ropes on two sides, and adjusting the tension by using a chain block, thus finishing the arching of the middle lifting and hanging.
1. The starting net rack has the span of 118 meters, the height of 43 meters, the upper chord of 38 balls in the thickness direction, the lower chord of 37 balls, the upper chord of 2 balls in the width direction and the lower chord of 3 balls.
2. When the splicing length is within 8 grids, one 50-ton truck crane is selected for splicing and hoisting, and when the splicing length exceeds 8 grids, two 50-ton truck cranes are selected for splicing and hoisting. Along with the assembly progress, the crane for hoisting the walking frame timely changes the hoisting point position.
3. When the assembly reaches 25 grids with upper chords and 24 grids with lower limits and the span length reaches 97m, the total weight is 68 tons, 4 QY160K type truck cranes are selected for lifting and hoisting, the distance between hoisting points is 75m, and the hoisting points are not adjusted as shown in figure 3.
4. From this point on, the lifting net rack can not fall to the ground, and the two ends finish the installation of the rest grids in sequence until the installation is finished to the support.
5. After the net rack is installed on the support seat, the crane does not unhook, the net rack is positioned and adjusted, and after stabilization, the bidirectional guy cables on two sides are arranged and reinforced.
6. After the starting unit is stabilized, the starting unit extends to two sides of the support grids at two ends and is installed, and subsequent high-altitude bulk loading is carried out.
Claims (1)
1. A construction method of a net rack starting unit with a middle lifting arch is characterized in that:
the method comprises the following specific steps:
preparation for starting
Rechecking the short column foundation, measuring the axial dimension, elevation and position of the embedded part, and rechecking according to the design and specification requirements; the rod piece and the bolt ball are transported to the designated position according to the plane plan, the unit cones are assembled, the crane, the sling, the cable rope and the ground anchor are prepared in place, and the ground anchor can be provided with a fixed ground anchor or a movable ground anchor;
the preparation of entering the field is carried out in advance,
ground assembly and positioning
Before ground assembly, a lifting point projection point position is released on the ground, so that the position deviation of the assembled net rack is controlled within 0.5m, and the influence on a subsequent crane station for integral lifting is prevented; when assembling the ground, continuously assembling the unit cones from one end to the other end, hoisting the assembled end off the ground by using a crane, manually installing the unit cones, hoisting the unit cones by using the crane in a heavier way, and timely replacing the hoisting point position of the crane for hoisting the scaffold along with the assembling progress;
is lifted to be assembled at two ends
After 24 grids are assembled on the ground, the net rack is hoisted by four 160-ton cranes, two hoisting unit cones of 25-ton cranes are respectively arranged at two ends, and each row of grids are installed, and the end parts are hoisted by one grid height so as to facilitate the subsequent installation;
launch unit seating and reinforcement
Assembling the complete part of the grid and then positioning; the net rack support enters the inner side of the column top short column and is in place by adopting a mode that cranes at two ends slowly fall in turn;
(1) in the falling process of the lifting hook, when the support is close to the top of the post-top short column, the position of the axis of the net rack is roughly adjusted;
(2) when the distance between the support and the embedded part at the top of the column is about 90 to 110mm, finely adjusting the axis of the net rack;
(3) slowly dropping the crane at the end A, and moving the suspension arm to enable the support to be attached to the embedded part of the post-top short column to slowly drop until the support falls on the embedded part when the distance between the bottom of the support and the horizontal embedded part at the top of the post ranges from 15 to 25mm;
(4) the lifting hook at the end A continuously and slowly falls, the support at the end B slowly moves outwards under the self-weight action of the net rack, when the distance between the support at the end B and the short column embedded part is 15 to 25mm, the crane at the end A stops falling, the crane at the end B starts to slowly fall until the support is in place, and the support can automatically press close to the short column embedded part on the outer side under the self-weight action of the structure;
(5) and (4) adding safety facilities: after the starting unit is in place, two guy cables are pulled on two sides of the net rack, grids at the support positions at the two ends A and B are installed and widened, and starting installation is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210537605.9A CN115233830A (en) | 2022-05-18 | 2022-05-18 | Construction method of net rack starting unit for middle lifting arch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210537605.9A CN115233830A (en) | 2022-05-18 | 2022-05-18 | Construction method of net rack starting unit for middle lifting arch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115233830A true CN115233830A (en) | 2022-10-25 |
Family
ID=83668554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210537605.9A Pending CN115233830A (en) | 2022-05-18 | 2022-05-18 | Construction method of net rack starting unit for middle lifting arch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115233830A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866986A (en) * | 2014-03-09 | 2014-06-18 | 山西四建集团有限公司 | Installing method of large-span variable-cross-section screw bolt ball node reticulated shell |
| CN110158774A (en) * | 2019-06-24 | 2019-08-23 | 南通大学 | A kind of construction method that large span grid double-machine lifting crane subregion closes up |
| CN110259145A (en) * | 2019-06-28 | 2019-09-20 | 中冶建工集团有限公司 | A kind of arch tubular truss rapid constructing method |
| CN111255075A (en) * | 2020-02-10 | 2020-06-09 | 徐州中煤百甲重钢科技股份有限公司 | Construction method of arched evacuated bolt ball latticed shell structure |
-
2022
- 2022-05-18 CN CN202210537605.9A patent/CN115233830A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866986A (en) * | 2014-03-09 | 2014-06-18 | 山西四建集团有限公司 | Installing method of large-span variable-cross-section screw bolt ball node reticulated shell |
| CN110158774A (en) * | 2019-06-24 | 2019-08-23 | 南通大学 | A kind of construction method that large span grid double-machine lifting crane subregion closes up |
| CN110259145A (en) * | 2019-06-28 | 2019-09-20 | 中冶建工集团有限公司 | A kind of arch tubular truss rapid constructing method |
| CN111255075A (en) * | 2020-02-10 | 2020-06-09 | 徐州中煤百甲重钢科技股份有限公司 | Construction method of arched evacuated bolt ball latticed shell structure |
Non-Patent Citations (1)
| Title |
|---|
| 张大魏等: "某大跨度干煤棚筒壳网架安装施工技术", 建筑施工, pages 1656 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110259145A (en) | A kind of arch tubular truss rapid constructing method | |
| CN208815424U (en) | A kind of bridge descending hanging basket | |
| CN105484503A (en) | Method for hoisting inclining shuttle-shaped space truss | |
| CN105113803A (en) | High-altitude sliding hoisting device of corridor truss of mountain and implementing method of high-altitude sliding hoisting device | |
| CN112502474A (en) | Dismantling device and method for indoor large steel framework | |
| CN111218987A (en) | Bearing type net rack construction method | |
| CN111648585A (en) | Construction method and device of suspended support type steel truss platform | |
| CN111779274A (en) | Construction method for integrally lifting temporary hoisting point of large-span unequal-height steel structure net rack | |
| CN208533370U (en) | A kind of Bridge Erector of large span steel reinforced concrete combination beam erection construction | |
| CN103132702A (en) | Longspan pipe truss pulling bar lifting and overhead rotating emplacing construction method | |
| CN112942132B (en) | Front supporting point composite hanging basket and shifting method thereof | |
| CN112160246B (en) | Method for installing composite beam | |
| CN204983693U (en) | Hoist device slides in mountain area corridor truss high altitude | |
| CN218434629U (en) | Lifting frame for tower type pier construction | |
| CN214656451U (en) | Front supporting point composite hanging basket | |
| CN115233830A (en) | Construction method of net rack starting unit for middle lifting arch | |
| CN103743581B (en) | Internal-climbing tower crane test platform device and test method | |
| JPH06167089A (en) | Facing of lower surface of aerial framing body | |
| CN105386414A (en) | Lower-guide type main-truss-free hanging basket | |
| CN212077660U (en) | Large-span wide width bridge girder rhombus hanging basket construction structure | |
| CN109972845B (en) | Method for mounting steel roof truss | |
| CN210797292U (en) | Six-direction positioning and quick adjusting device for realizing prefabricated section beam | |
| CN210766433U (en) | Trapezoidal hanging basket structure | |
| CN112252195A (en) | Assembly type continuous beam prestressed steel strand whole-bundle tensioning operation trolley and use method thereof | |
| CN111453630A (en) | Bridge deck crane and using method 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 |