CN104712083B - The cable tension method of large span drag-line glass curtain wall - Google Patents
The cable tension method of large span drag-line glass curtain wall Download PDFInfo
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- CN104712083B CN104712083B CN201510130209.4A CN201510130209A CN104712083B CN 104712083 B CN104712083 B CN 104712083B CN 201510130209 A CN201510130209 A CN 201510130209A CN 104712083 B CN104712083 B CN 104712083B
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Abstract
The invention discloses a kind of cable tension method of large span drag-line glass curtain wall, including：The mechanics analysis model of curtain wall is set up, is the both sides that curtain wall is symmetrically arranged in along the length direction of curtain wall by Cable to be tensioned, test load is applied to model, obtain the force analysis result of each drag-line under test load effect；Job site surveying setting-out, it is determined that for installing the top support of drag-line and the anchor point of bottom support bracket, top support is designed with bottom support bracket in one-to-one mode；According to anchor point, top support and the mounting base bearing on the basis of the curtain wall of curtain wall both sides is symmetricly set in are symmetrically installed along the length direction of curtain wall on curtain wall back timber；Drag-line is installed between corresponding top support and bottom support bracket；According to force analysis result, tensioning is carried out to drag-line.The present invention passes through model force analysis, for construction process control provides foundation, to meet the basic design principle of engineering, it is ensured that the security of structure in stretching process.
Description
Technical field
The present invention relates to technical field of building construction, a kind of cable tension side of large span drag-line glass curtain wall is referred in particular to
Method.
Background technology
At present, newly-built large-scale public and civil buildings, the particularly building of large space, large span, will carry out it is big across
Spend the cable tension construction of drag-line glass curtain wall.But because curtain wall span is big, drag-line quantity is more, conventional curtain wall inhaul cable tensioning
Mode is not suitable for the cable tension construction of large span drag-line glass curtain wall.Therefore, it is necessary to develop a kind of new being applied to
The cable tension construction of large span drag-line glass curtain wall.
The content of the invention
In view of above mentioned problem, the invention provides a kind of cable tension method of large span drag-line glass curtain wall, including：
The mechanics analysis model of curtain wall is set up, is to be symmetrically arranged in along the length direction of curtain wall by Cable to be tensioned
The both sides of curtain wall, test load is applied to the model, obtains the stress point of each drag-line under test load effect
Analysis result；
Job site surveying setting-out, it is determined that for installing the top support of the drag-line and the anchor point of bottom support bracket, will
The top support is designed with the bottom support bracket in one-to-one mode；
According to the anchor point, the top support is symmetrically installed and right along the length direction of curtain wall on curtain wall back timber
Title installs the subplate bearer on the basis of being arranged at the curtain wall of curtain wall both sides；
The drag-line is installed between the corresponding top support and the bottom support bracket；
According to the force analysis result, tensioning is carried out to the drag-line.
The cable tension method of large span drag-line glass curtain wall of the present invention, is work progress control by model force analysis
System provides foundation, to meet safe, economic, applicable, the rational basic design principle of engineering, it is ensured that structure in stretching process
Security, reaches expected stress.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are, the top support bag
Top board and the top otic placode located at the top board are included, the bottom support bracket includes base plate and the bottom otic placode located at the base plate.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are to pacify on the basis of curtain wall
The bottom support bracket is filled, including：
Pre-embedded steel slab is transferred on the basis of the curtain wall according to the anchor point；
Dowel is set on the reinforcing bar on curtain wall basis；
The casting concrete on the basis of the curtain wall, the dowel is embedded in concrete, and by the pre-embedded steel slab
Upper surface outside the concrete；
The base plate in the bottom support bracket is welded on the pre-embedded steel slab.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are, according to the anchor point
Pre-embedded steel slab is transferred on the basis of the curtain wall, including：
Make the center line of the pre-embedded steel slab；
The center line is measured, in making before and after the front-rear center point of the bottom support bracket and the top support
Heart point is on same vertical line.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are to pacify on curtain wall back timber
The top support is filled, including：According to the anchor point, the top board in the top support is welded on the curtain wall top
Liang Shang.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are, in the top support
The drag-line is installed between the bottom support bracket, including：
Cable tray is installed at the construction field (site)；
Drag-line advance coiling disc forming is lifted on the cable tray；
Drag-line is arranged on by the top support by crane；
Using electric block, the drag-line is drawn to the bottom support bracket and is installed.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are to be divided into the drag-line
A plurality of tensioning groups, each tensioning group includes being symmetricly set in two drag-line groups of curtain wall both sides, each drag-line group
Including two drag-lines, two drag-lines in the drag-line group are passed through into double cord clips and has interconnection.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are that the drag-line is carried out
During tensioning, four drag-lines in tensioning group described in each synchronous tension, and the tensioning of four drag-lines is highly identical.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are that the drag-line is carried out
During tensioning, first with first order tensioning by the cable tension to designing the 60% of stretching force, then with second level tensioning by the drawing
Cable stretching extremely designs the 105% of stretching force.
The cable tension further improvements in methods of large span drag-line glass curtain wall of the present invention are, by the first order
Pulling is to design 10%, 20%, 30%, 40% and 60% Pyatyi of stretching force, the second level tensioning is divided into 70%,
80%th, 90%, 100% and 105% 5 rank.
Brief description of the drawings
Fig. 1 is the flow chart of the cable tension method of large span drag-line glass curtain wall of the present invention.
Fig. 2 is the schematic diagram of the curtain wall tension structure of the cable tension method of large span drag-line glass curtain wall of the present invention.
Fig. 3 is the scheme of installation of the drag-line of the cable tension method of large span drag-line glass curtain wall of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
Fig. 1 is referred to, Fig. 1 is the flow chart of the cable tension method of large span drag-line glass curtain wall of the present invention.Coordinate ginseng
See shown in Fig. 1, the cable tension method of large span drag-line glass curtain wall of the present invention, including：
S101The mechanics analysis model of curtain wall is set up using finite element software, is along curtain wall by Cable to be tensioned
Length direction is symmetrically arranged in the both sides of curtain wall, and test load is applied to the model, obtains under test load effect
Each drag-line force analysis result；
Fig. 2 is referred to, Fig. 2 is the curtain wall tension structure of the cable tension method of large span drag-line glass curtain wall of the present invention
Schematic diagram.Coordinate shown in Fig. 2, the lower section of the curtain wall back timber 10 of large span drag-line glass curtain wall is provided with support column 20 and tensioning
There is drag-line 30.The relevant design file provided according to designing institute sets up threedimensional model, with large-scale general finite element software SAP2000
The mechanics analysis model of curtain wall is set up, the test loads such as prestressing force, deadweight, wind, earthquake, temperature are applied to model respectively, and it is right
The stress of the whole drag-lines on each lower curtain wall of test load effect is analyzed, and by model force analysis, draws each drag-line
Amount of deflection, axle power, the force analysis result of end reaction.
S102The technical difficulty of complexity and precision controlling according to job site, determines using local after first overall control
The general thought of control, the measurement technique of job site surveying setting-out and location control is carried out by coordinate system, it is determined that being used for
The anchor point of top support and the bottom support bracket of drag-line 30 is installed, by the top support and the bottom support bracket corresponding
Mode design；
S103Fig. 3 is referred to, Fig. 3 is the installation of the drag-line of the cable tension method of large span drag-line glass curtain wall of the present invention
Schematic diagram.Coordinate referring to shown in Fig. 3, according to the anchor point, the length direction along curtain wall on curtain wall back timber 10 is symmetrically installed
Top support and the mounting base bearing on the basis of the curtain wall of curtain wall both sides is symmetricly set in, wherein, top support includes top board
40 include base plate 50 and the bottom otic placode 70 for being welded in base plate 50 with the top otic placode 60 for being welded in top board 40, bottom support bracket；
During 3.1 construction bottom support bracket：
Pre-embedded steel slab is transferred according to the anchor point released is accurate on the basis of the curtain wall；In the reinforcing bar on curtain wall basis
Upper setting dowel, dowel and concrete beam reinforcing firm welding；The casting concrete on the basis of the curtain wall, concreting
Cheng Zhong, sends special messenger's supervision and check, it is ensured that the embedded part that vibrates is not shifted, it is desirable to built-in fitting absolute altitude deviation ± 5mm, the position of embedded part with set
Meter position deviation ≯ 10mm, the dowel is embedded in concrete, and the upper surface of the pre-embedded steel slab is exposed into coagulation
It is native outer, then the base plate 50 of the bottom support bracket is welded on the pre-embedded steel slab.Further, when transferring pre-embedded steel slab,
According to curtain wall feature, four sides control point is found out according to drawing, makes the center line of pre-embedded steel slab, the center line is carried out by
One measurement, reduces random error of measurement, makes the front-rear center point of bottom support bracket to be installed and the front-rear center point of top support
On same vertical line, so that ensure to install will not run-off the straight during pre- stretching wire rope.
During 3.2 installation top support：
1) welding procedure of top support is carried out using driven hanging basket.Hanging basket is comprehensively checked using preceding, and led to
Electricity is debugged.During hanging basket use, hanging basket attendant regularly should be checked Steel wire rope lock button.2) it is accurately positioned top
The center of portion's bearing, bottom support bracket, ejects cross wire, and error is in ± 3mm.3) level weld seam requirement is first-order weld, institute
Having welder must carry out welding examination, it is qualified after can be subjected to.4) after the completion of top support and bottom support bracket are welded,
Magnetic powder inspection detection is carried out to weld seam, it is ensured that all weldqualities reach the requirement of first-order weld, the work of next step can be carried out
Sequence.
S104Coordinate shown in Fig. 3, in the top otic placode 60 and the bottom otic placode 70 of bottom support bracket of corresponding top support
Between install drag-line 30；
4.1 riggings are selected
When installing drag-line, by normal cable curtain wall construction technology, the cutting length measurement of rigging must be in agent structure
Could start after stabilization, otherwise influence whether guy cable length, and then influence the security of tensioning process and structure.Standard
Rigging maximal regulated amount is+170mm~-50mm.Measurement error value, rigging mismachining tolerance, body junction of the present invention according to scene
The malformation value that theory deformation value under structure load, tensioning cause, from non-standard technique process rigging, adjustment length up to+
150mm~-270mm.
4.2 drag-lines are installed and pretension
1) cable tray is installed at the construction field (site), in order to site operation is convenient, by cable body coiling disc forming in processing factory, to now
It is lifted on pre-processed cable tray after.
2) drag-line is according to the order for first loading onto anchor point (i.e. top support position) and refilling anchorage (i.e. bottom support bracket position),
Install successively, upper anchor point uses two 25t truck cranes, wherein a responsible lifting, a responsible auxiliary in addition.Upper anchor point is installed
After finishing, electric block is fixed on crane, installed with rope traction anchorage.Using crane combination electric block with
And the mode of steel wire rope carries out the construction of reeving of large span, simple and convenient, high construction efficiency.
During installation, the drag-line is divided into a plurality of tensioning groups, each tensioning group includes being symmetricly set in curtain wall two
Two drag-line groups of side, each drag-line group includes two drag-lines, and two drag-lines in the drag-line group are led to
Double cord clip tools are crossed to be connected with each other.
3) during drag-line draws high upwards, keep a close eye on tapered end and pass through agent structure fixing point position, speed is slow, prevents
Only locking head block is in adapter.
4) drag-line is pulled to top, and tied rope at the tapered end that comes loose bolts tapered end and top support, then firm part is unclamped, complete
Into drag-line lifting.
5) drag-line carries out pretension after installing, i.e., to assigning drag-line certain stretching force, produced with the weight for overcoming drag-line itself
Raw amount of deflection, makes drag-line be in the pulling preparation stage.
S105According to the force analysis result, tensioning is carried out to the drag-line.
5.1 pulling preparations
1) it is in free state, length 1mm~3mm bigger than design load before drag-line is installed.Every drag-line is numbered, in advance
Carry out target Suo Libiao.
2) pitch-row and spacing before tensioning to top otic placode carry out repetition measurement.Kinematic error during according to measurement error and blanking
Contrasted, without adjustment if kinematic error requirement is met, if be unsatisfactory for, readjusted the position of top otic placode.
The spacing of top otic placode then needs to consider the allowable error that glass is installed, generally 6mm.
3) before tensioning, stretching force table and target Suo Libiao are carried out, stretching force is calculated according to final Suo Li using the method for tearing open
Come.Tensioning completes design Suo Li, i.e. the target Suo Li at moment, while being also the examination Suo Li that tensioning is checked and accepted.
5.2 tension sequences
Tension sequence causes the minimum principle of agent structure deformation values with tensioning, during construction, it then follows computer simulation emulation
Tension sequence carry out.Specifically, four drag-lines in tensioning group described in each synchronous tension, and four drag-lines
Tensioning is highly identical.Using symmetrical stretching mode, curtain wall becomes due to unbalance stress during can preventing tensioning
Shape.
5.3 stretching forces are classified：
1) tensioning is divided into two-stage, and the first order is stretched to the 60% of design stretching force, and the second level is stretched to design tension force
105%.According to Suo Li measured results, it is finely adjusted to being unsatisfactory for power to be seeked.
2) every grade of tensioning subdivides small level, and first order tensioning is subdivided into 5 small levels, respectively design stretching force 10%,
20%th, 30%, 40%, 60%；Second level tensioning is subdivided into 5 small levels, respectively design stretching force 70%, 80%, 90%,
100%th, 105%, pause (30 seconds) of short duration is done in the middle of every two-stage, the stretch value of drag-line is measured, monitor that curtain wall occurs
Deformation, adjustment tensioning degree, prevents from causing curtain wall to deform because disposable tensioning degree is excessive in time.
5.4 tension operation main points
1) tensioning equipment is installed, and because tensioning equipment component is more, therefore must be handled with care when being installed, and makes to open
The drawing equipment centre of form overlaps with the drag-line centre of form, to ensure that prestressed cable does not produce bias when tensioning is carried out.
2) prestress steel cable stretching：Reached progressively synchronously using the method for point small level, each small level terminates to unify adjustment,
Lapie slows down faster, the slow quickening speed of tensioning, is finally reached synchronous tension.
3) temperature adjustmemt：Tensioning completes rope force value and tensioning force value is both needed to, when tensioning temperature identical with design basis temperature
When degree difference is larger, temperature corrected value should be calculated.According to average degree/day at that time, stretching force calculated value is superimposed i.e. with correction value
It is actual stretching force numerical value.
4) stretching process security control
1. tensioning tooling installation qualification could pressurize, and stretching process strictly controls pressing speed, control actually applied pulling force
No more than the 10% of calculating stretching force.
2. rational tension sequence is selected, symmetrical configuration stress, the outer moment of torsion of plane of control plane truss is made as far as possible.Using
The method of dual control carries out tensioning, and, used as dominant item, stretch value is used as check for stretching force.
3. strengthen the monitoring of Suo Li and deformation in stretching process, make every effort to the accuracy of measurement, when monitoring data error is larger,
Tensioning, analytical error reason should be suspended.
5) tensioning surveying record：Drag-line original length is recorded first, per tensioning one-level, is then recorded pressure sensor and is measured pressure
Power and total powerstation measure agent structure deformation values, and after the completion of tensioning, surveying record drag-line drift, records overall elongation again
Value, to carry out overall process monitoring to stayed structure and agent structure.
6) pulling force monitoring, check：Cable tension can be produced necessarily due to metal material self-characteristic after finishing in length
That measures creeps, and value of thrust can also decline therewith, therefore cable tension need to after 5 days carry out detection check, if surveyed numerical value exceeds
The tensioning that should give in time of scope of design is adjusted, and value of thrust is tensioned less than the carrying out of design load, and the carrying out beyond design load unloads power,
So that with a pair of the values of thrust equalizations and difference of drag-line no more than 5kN.
5.5 points for attention
1) the structure stress situation and Suo Li situations of change of each tensioning step should in detail be calculated, it is ensured that structural elements and
Cable forces are no more than limit condition design value, there is enough safety stocks.
2) it is the safety that ensures structure and tensioning tooling, tension operation should strictly control the stretching force, stretching force must not to exceed
Theoretical value 10%, drag-line stretch value is listed in target Suo Libiao.
3) cable tension is completed, and carries out Suo Li actual measurements, mechanical model is adjusted, to stayed structure under various load cases
Security is checked, it is ensured that safety of structure.
Finally, stretching construction is monitored and is checked and accepted
1) deformation monitoring
During prestress steel cable stretching, with reference to simulative calculation of construction result, the deformation of structure is monitored can
The quality of the safety of structure and prestress application during to ensure pre-stress construction, deformation monitoring uses total powerstation.
The deformation that will be measured in stretching process is compared with the theory deformation for calculating, if difference is larger (exceeded
20%) stop tensioning when, find reason and be further continued for tensioning after determining solution.
2) cable force monitoring
The monitoring of Suo Li can be monitored by oil pressure sensor and dynamic tester, and Suo Li dynamic testers use monitoring vibration frequently
Rate determines the instrument of Suo Li.
Oil pressure sensor is installed on hydraulic jack oil pump, and sensor special readout instrument is passed through during tensioning cable
The pulling force of prestressed cable can at any time be monitored.
3) check and accept
After cable force monitoring 7 days, deformation values organize management to check and accept, and carry out next process and apply in design allowed band
Work.
The cable tension method of large span drag-line glass curtain wall of the present invention, is work progress control by model force analysis
System provides foundation, to meet safe, economic, applicable, the rational basic design principle of engineering, it is ensured that structure in stretching process
Security, reaches expected stress.The characteristics of according to engineering and the actual conditions at scene, are distributed with the Suo Li of design requirement
It is desired value, selects rational tension sequence and stage division, by simulation calculation, draw the stretching force of every rope of every step, protects
The security of structure, reaches expected stress in card stretching process.Designed with guidance program, select optimization design scheme,
For construction process control provides foundation, to meet safe, economic, applicable, the rational basic design principle of engineering, reach simple
It is convenient, the beneficial effect of high construction efficiency.
The above is only presently preferred embodiments of the present invention, and any formal limitation is not done to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, not departing from the range of technical solution of the present invention, when making a little change using the technology contents of the disclosure above or repair
The Equivalent embodiments for equivalent variations are adornd, as long as being the content without departing from technical solution of the present invention, according to technology reality of the invention
Any simple modification, equivalent variations and modification that confrontation above example is made, still fall within the scope of technical solution of the present invention
It is interior.
Claims (8)
1. a kind of cable tension method of large span drag-line glass curtain wall, it is characterised in that including：
The mechanics analysis model of curtain wall is set up, is to be symmetrically arranged in curtain wall along the length direction of curtain wall by Cable to be tensioned
Both sides, to the model apply test load, obtain the test load effect under each drag-line force analysis knot
Really；
Job site surveying setting-out, it is determined that for installing the top support of the drag-line and the anchor point of bottom support bracket, will be described
Top support is designed with the bottom support bracket in one-to-one mode, and the top support includes top board and is located at the top board
Top otic placode, the bottom support bracket include base plate with located at the base plate bottom otic placode；
According to the anchor point, along the length direction of curtain wall it is symmetrically installed the top support on curtain wall back timber and is symmetrically setting
It is placed on the basis of the curtain wall of curtain wall both sides and the bottom support bracket is installed；
The drag-line is installed between the corresponding top support and the bottom support bracket；
According to the force analysis result, tensioning is carried out to the drag-line；
Further, the bottom support bracket is installed on the basis of curtain wall, including：
Pre-embedded steel slab is transferred on the basis of the curtain wall according to the anchor point；
Dowel is set on the reinforcing bar on curtain wall basis；
The casting concrete on the basis of the curtain wall, the dowel is embedded in concrete, and by the upper of the pre-embedded steel slab
Surface is outside concrete；
The base plate in the bottom support bracket is welded on the pre-embedded steel slab.
2. the cable tension method of large span drag-line glass curtain wall as claimed in claim 1, it is characterised in that according to described fixed
Pre-embedded steel slab is transferred in site on the basis of the curtain wall, including：
Make the center line of the pre-embedded steel slab；
The center line is measured, makes the front-rear center point of the bottom support bracket and the front-rear center point of the top support
On same vertical line.
3. the cable tension method of large span drag-line glass curtain wall as claimed in claim 1, it is characterised in that in curtain wall back timber
The upper installation top support, including：According to the anchor point, the top board in the top support is welded on the curtain
On wall back timber.
4. the cable tension method of large span drag-line glass curtain wall as claimed in claim 1, it is characterised in that at the top
The drag-line is installed between bearing and the bottom support bracket, including：
Cable tray is installed at the construction field (site)；
Drag-line advance coiling disc forming is lifted on the cable tray；
Drag-line is arranged on by the top support by crane；
Using electric block, the drag-line is drawn to the bottom support bracket and is installed.
5. the cable tension method of large span drag-line glass curtain wall as claimed in claim 1, it is characterised in that by the drag-line
It is divided into a plurality of tensioning groups, each tensioning group includes being symmetricly set in two drag-line groups of curtain wall both sides, each drawing
Rope group includes two drag-lines, and two drag-lines in the drag-line group are passed through into double cord clips has interconnection.
6. the cable tension method of large span drag-line glass curtain wall as claimed in claim 5, it is characterised in that to the drag-line
When carrying out tensioning, four drag-lines in tensioning group described in each synchronous tension, and four tensioning height phases of the drag-line
Together.
7. the cable tension method of large span drag-line glass curtain wall as claimed in claim 1, it is characterised in that to the drag-line
When carrying out tensioning, first with first order tensioning by the cable tension to designing the 60% of stretching force, then with second level tensioning by institute
State cable tension to the 105% of design stretching force.
8. the cable tension method of large span drag-line glass curtain wall as claimed in claim 7, it is characterised in that by described first
Level tensioning is divided into 10%, 20%, 30%, 40% and 60% Pyatyi of design stretching force, the second level tensioning is divided into 70%,
80%th, 90%, 100% and 105% 5 rank.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108151957B (en) * | 2017-12-04 | 2024-03-08 | 交通运输部公路科学研究所 | Cable force dynamic tester calibration device and method |
| CN112347677A (en) * | 2020-11-10 | 2021-02-09 | 中铁十四局集团建筑工程有限公司 | Assembly type curtain wall integral lifting installation construction method based on BIM model construction technology support |
| CN112726444A (en) * | 2020-12-30 | 2021-04-30 | 中铁六局集团北京铁路建设有限公司 | Closed sound barrier foundation optimization structure and treatment process thereof |
| CN113322810A (en) * | 2021-04-22 | 2021-08-31 | 西北工业大学 | Debugging and installing system and method for stay cable of anti-seismic support |
| CN114482349B (en) * | 2022-01-12 | 2023-06-27 | 浙江精工钢结构集团有限公司 | Construction method for supporting large-span glass curtain wall system by using through double-pull-rod steel frame |
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