CN105952244A - Rotary lifting construction method for large-scale tree-shaped structure - Google Patents
Rotary lifting construction method for large-scale tree-shaped structure Download PDFInfo
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- CN105952244A CN105952244A CN201610289860.0A CN201610289860A CN105952244A CN 105952244 A CN105952244 A CN 105952244A CN 201610289860 A CN201610289860 A CN 201610289860A CN 105952244 A CN105952244 A CN 105952244A
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- branch
- lifting
- lifter
- tree
- trunk part
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/34—Arrangements for erecting or lowering towers, masts, poles, chimney stacks, or the like
- E04H12/342—Arrangements for stacking tower sections on top of each other
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a rotary lifting construction method for a large-scale tree-shaped structure comprising following steps: a trunk portion of the large-scale tree-shaped structure is installed on a basic surface; a lifting tower is set on the trunk portion, and a lifting device is installed on the lifting tower; branch portions of the large-scale tree-shaped structure are lifted to a to-be lifted position, the branch portions and the trunk portion are hinged together, and a lifting cable device is pulled and installed between the branch portions and the lifting device; the lifting device is started, the branch portions are lifted upwards by the lifting cable device to make the branch portions rotate about the hinged position and be lifted to the trunk portion; after the branch portions are rotated and lifted in place, the branch portions and the trunk portion are fixed. According to the method, a rotary lifting method is adopted, the branch portions are rotationally lifted by the lifting tower and the lifting device installed at the trunk portion of the large-scale tree-shaped structure; there is no need to additionally set scaffolds or use large size lifting machinery to install the branch portions so that construction procedure and cost are saved.
Description
Technical field
The present invention relates to the construction field of a kind of tree-shaped building structure, particularly relate to a kind of large-scale tree-shaped knot
Structure rotate and upgrade construction method.
Background technology
Tree is the one of space biomimetic features, by German Architects Frei Otto in 20th century
A kind of version that the sixties proposes based on configuration concept, because of its geometrical body and nature
Tree similar and gain the name.In space structure field, it is classified as modern rigid space structure.
Tree sketch is as it is shown in figure 1, there are three features: one by trunk 31 and continuous classification
Branch 32 forms space-load system；Two is that the power stream that top load produces converges step by step along branch,
It is ultimately transferred to basis, there is the direct advantage of Path of Force Transfer；Three is compared with traditional single-column, with
Multi-point support instead of single point supporting, thus on the premise of using function unaffected, makes top water
Flat component span reduces, uniform force.
The research for tree both at home and abroad is concentrated mainly on three fields: tree look for shape excellent
Change method, the stability analysis of tree and joint structure, and the construction technology of tree.To the greatest extent
Manage tree in recent years to widely apply at home, but mainly also focus on platform awning, meeting
In the projects such as exhibition building, height and the single-column area coverage of tree are the most extremely limited.At present for
Research and the application achievements of large-scale tree-shaped post are less.
Tree has form and the mechanical characteristic of space three-dimensional, node typically by many steel pipes with not
Same space angle junction forms.The installation of each component of tree is required for strictly controlling its geometry
Position and space angle, error installed by any component all may affect the smooth installation of total.Tree
Although the shape structure scale of construction is relatively big, but whole hanging method conventional in large steel structure installation method, jacking
Method, sliding method etc. all cannot meet the requirement of tree construction.Assembly in pieces at height and unit lifting method
Can preferably adapt to Morphological Features and the construction requirement of tree, be applied to multinomial tree
Engineering.
Assembly in pieces at height, is method smallest assembled rigid unit or loose mail directly always spelled at design attitude,
In rack net shell engineering the most conventional.Assembly in pieces at height divides full Support Method (i.e. setting up full hall scaffold)
With the method for encorbelmenting two kinds.Tree preferably selects full Support Method to construct according to its feature.Tree
Using the advantage of Assembly in pieces at height is that accurate positioning, installation accuracy are high, shortcoming be need to set up substantial amounts of
Assembling support.
Unit lifting method, refers to, according to structure self form division unit, be lifted by hoisting machinery respectively
In place to high-altitude shelve, the method being assembled into entirety the most again.Tree can be drawn according to geometric properties
Subdivision, each unit carries out assembly and welding respectively on ground, according still further to from bottom to top, by centre to
The order of surrounding winches to high-altitude design attitude and completes to assemble.The advantage that tree uses unit lifting method
Being that amount of high-altitude operation is few, major part welding and assembled work are all carried out on ground, and assembling support also reduces
A lot.Shortcoming is to need large tonnage crane gear during lifting, and component difficulty in place is very big, installs
Precision cannot ensure.
Assembly in pieces at height and unit lifting method achieve preferably in past many middle-size and small-size tree projects
Technology and economic effect.But for large-scale tree, there is limitation in both approaches.When
Use Assembly in pieces at height when tree projected area is relatively big, branch position is higher, set up full hall foot hands
Frame is time-consuming takes a lot of work.When construct periphery place complexity time, unit lifting method because of large scale hoisting machinery be difficult to into
And cannot apply.To this end, the present invention is intended to propose a kind of rotation being applicable to the construction of large-scale tree
Lift method.
Summary of the invention
The technical problem to be solved is to provide a kind of without setting up full hall scaffold, and avoids
Large scale hoisting machinery admission, be applicable to carry out on the floor face constructed to construct large-scale tree-shaped
Structure rotate and upgrade construction method, constructing operation is easy and component is in place the most quick.
For realizing above-mentioned technique effect, the invention discloses a kind of rotating and upgrading of large-scale tree and execute
Work method, including step:
The trunk part of large-scale tree is installed on base surface；
On described trunk part, set up lifting pylon, and lifting means is installed on described lifting pylon；
The branch part of large-scale tree is sling to position to be hoisted, by described branch part and institute
State trunk part to be hinged, and draw between described branch part and described lifting means set raising cord dress
Put；
Starting described lifting means, described raising cord device is lifted up described branch part, makes described
Branch part rotates and upgrades to described trunk part around articulated position；
After described branch part rotates and upgrades and puts in place, described branch part and described trunk part are entered
Row is fixing.
The construction method that rotates and upgrades of described large-scale tree is further improved by, by large-scale
The branch part of tree is sling to position to be hoisted, in advance by the branch portion of large-scale tree
Graduation is divided into organizes lift unit more, often organizes described lift unit and includes being positioned at described trunk part both sides
First branch and the second branch；
When the branch part of large-scale tree is sling to position to be hoisted, sling successively and often organize institute
State described first branch of lift unit and described second branch, utilize described lifting means and described in carry
Rise rope device successively described first branch and described second branch of often organizing described lift unit to be rotated and carried
Rise on described trunk part.
The construction method that rotates and upgrades of described large-scale tree is further improved by, described lifting
Equipment includes the first lifter and the second lifter being located at described lifting tower top both sides, described in carry
Rise rope device include the first raising cord connecting described first lifter and connect described second lifter
Second raising cord.
The construction method that rotates and upgrades of described large-scale tree is further improved by, by following
Step utilizes described lifting means and described raising cord device by described of lift unit described in each group
One branch and described second branch rotate and upgrade to described trunk part:
Sling described first branch of described lift unit, by the first end of described first branch with described
Trunk part is hinged, and draws between second end and described first lifter of described first branch and set
Described first raising cord；
Sling described second branch of described lift unit, by the first end of described second branch with described
Trunk part is hinged, and draws between second end and described second lifter of described second branch and set
Described second raising cord；
Starting described first lifter, described first raising cord is lifted up the second of described first branch
End, rotates and upgrades described first branch to described trunk part；
Starting described second lifter, described second raising cord is lifted up the second of described second branch
End, rotates and upgrades described second branch to described trunk part.
The construction method that rotates and upgrades of described large-scale tree is further improved by, and described first
The weight of branch is equal to the weight of described second branch；Starting described first lifter and described second
During lifter, the first lifter described in synchronous averaging and described second lifter, by described first branch
And described second branch synchronized rotating hoisting is on described trunk part.
The construction method that rotates and upgrades of described large-scale tree is further improved by, and described first
The weight of branch is more than the weight of described second branch；
Before starting described first lifter and described second lifter, in advance prior to described second branch
Draw between the bottom of the second end and described trunk part and set dorsal funciculus；
When starting described first lifter and described second lifter, first start described first lifter,
Described first raising cord is lifted up the second end of described first branch, is rotated by described first branch and carries
Rise on described trunk part；Restart described second lifter, under the effect of described dorsal funciculus, institute
State the second raising cord and be lifted up the second end of described second branch, described second branch is rotated and upgraded
To described trunk part.
The construction method that rotates and upgrades of described large-scale tree is further improved by, and treats described tree
Branch part rotates and upgrades after putting in place, the step being fixed described branch part and described trunk part
Including:
After described first branch often organizing described lift unit rotates and upgrades and puts in place, by described first tree
Branch docks with described trunk part, and installs the first support jig in the lower section of described first branch
It is supported；
After described second branch often organizing described lift unit rotates and upgrades and puts in place, by described second tree
Branch docks with described trunk part, and installs the second support jig in the lower section of described second branch
It is supported.
The construction method that rotates and upgrades of described large-scale tree is further improved by, described lifting
Pylon uses the axial compression fusiformis post that two ends are hinged, and the chord member of described lifting tower bottom intersects at one
Point, and ball hinged support is set in remittance point of intersection, described lifting pylon passes through described ball hinged support with described
The top of trunk part connects.
The construction method that rotates and upgrades of described large-scale tree is further improved by, in described tree
When setting up lifting pylon in stem portion, also it is included between described base surface and described lifting pylon to draw and sets
Wind cable.
The construction method that rotates and upgrades of described large-scale tree is further improved by, described basis
Face is the floor face constructed, and uses light weight crane to sling described branch part to position to be hoisted
Put.
Due to the fact that and have employed above technical scheme so that it is have the advantages that
(1) conventional Assembly in pieces at height and unit lifting method are not suitable for complex large-sized tree, adopt
Preferable techno-economic effect can be obtained by the method for rotating and upgrading；Main by large-scale tree
Lifting pylon and lifting means are set to rotate and upgrade branch part, it is not necessary to additionally set up on trunk part
Scaffold or use large scale hoisting machinery to install branch part, saves working procedure and also saves and execute
Work cost, and on-the-spot need to use light weight crane to carry out handling branch part, causes construction site
Load is less, it is adaptable at the floor face constructed, such as the construction on basement roof；
(2) branch part is divided into organizes lift unit more, often group lift unit comprises and be positioned at trunk
First branch of part both sides and the second branch, when the weight of the first branch and the second branch is suitable,
Use the scheme of Synchronous lifting, promote quickly and easily and often organize lift unit, and can guarantee that trunk part
Stress equalization, stable；When the first branch and the second branch weight such as not and weight difference are bigger, use
The scheme of asynchronous lifting, uses the first branch that first lifting weight is bigger, uses dorsal funciculus to fix simultaneously
The second branch that weight is less, after the first branch promotes and puts in place, then promotes the second branch, overcomes
Double branches do not wait rope force unbalance, guy cable force in the case of weight excessive and promote tower design difficulty etc. and lack
Fall into, it is ensured that the safety of lifting process.
(3) if employing rotates and upgrades double branches during method and do not waits weight, lifting pylon is adjusted to two ends hinged
Axial compression fusiformis post, can avoid not etc. not bringing up again liter tilting moment produced, and being substantially reduced pylon should
Power.
(4), after promoting tower design project setting, it is carried out monolithic stability numerical analysis, and will divide
Analysis result and proper calculation Comparative result, result shows that numerical result is with proper calculation result more
Close, it is satisfied by Stability Design requirement, the slightly lower reason of numerical value bearing capacity is overall with a point limb slenderness ratio
Close to the stable interaction caused.
Accompanying drawing explanation
Fig. 1 is the stress system sketch of tree.
Fig. 2 is the schematic diagram of the large-scale tree of the present invention.
Fig. 3 is the elevational schematic view of the large-scale tree of the present invention.
Fig. 4 is the flow chart rotating and upgrading construction method of the large-scale tree of the present invention.
What Fig. 5～9 was the large-scale tree of the present invention rotates and upgrades single group lift unit in construction method
Construction Principle figure.
Figure 10 is that the lifting of branch part in construction method that rotates and upgrades of the large-scale tree of the present invention is put down
Face layout drawing.
Figure 11～12 is the first embodiment party rotating and upgrading construction method of the large-scale tree of the present invention
The schematic diagram of case.
Figure 13～14 is the second embodiment party rotating and upgrading construction method of the large-scale tree of the present invention
The schematic diagram of case.
Figure 15～20 is each construction stage rotating and upgrading construction method of the large-scale tree of the present invention
Analyze model.
Figure 21 is that rotating and upgrading of the large-scale tree of the present invention promotes each staged construction mistake in construction method
Journey promotes cable force variation diagram.
Figure 22 be the large-scale tree of the present invention rotate and upgrade the full mistake of asynchronous lifting scheme in construction method
The back of the body cable force variation diagram of journey.
Figure 23 is that rotating and upgrading of the large-scale tree of the present invention pulls wind rope in lifting process in construction method
Hawser power variation diagram.
Figure 24 is that rotating and upgrading of the large-scale tree of the present invention promotes tower in lifting process in construction method
Top of the trellis maximum displacement variation diagram.
Figure 25 is that rotating and upgrading of the large-scale tree of the present invention promotes the 1st～4 of pylon in construction method
Rank buckling mode figure.
Figure 26 be the large-scale tree of the present invention rotate and upgrade the elastic lotus promoting pylon in construction method
Carry displacement curve figure.
Figure 27 be the large-scale tree of the present invention rotate and upgrade the elastoplasticity promoting pylon in construction method
Load-displacement curve figure.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention the present invention is further detailed explanation.
Dendritic structure has form and the mechanical characteristic of space three-dimensional, node typically by many steel pipes with not
Same space angle junction forms.The installation of each component of tree is required for strictly controlling its geometry
Position and space angle, error installed by any component all may affect the smooth installation of total.Tree
Although the shape structure scale of construction is relatively big, but whole hanging method conventional in large steel structure installation method, jacking
Method, sliding method etc. all cannot meet the requirement of tree construction.Assembly in pieces at height and unit lifting method
Preferable technology and economic effect is achieved in past many middle-size and small-size tree projects.But for
Large-scale tree, there is limitation in both approaches.When tree projected area is relatively big, branch
Use Assembly in pieces at height when position is higher, set up that full hall scaffold is time-consuming takes a lot of work.When construction periphery place
Time complicated, unit lifting method cannot be applied because large scale hoisting machinery is difficult to admission.To this end, the present invention
Propose a kind of be applicable to large-scale tree construction rotate and upgrade method.
Coordinating shown in Fig. 2 and Fig. 3, large-scale dendritic structure is mainly by trunk part 10 and branch part two
Part 13 forms, trunk part 10 generally steel core concrete column, is located on base surface；And branch
Part 13 generally is steel construction, and material can be Q355NHCZ25, is located at the top of trunk part,
Wherein, branch part 13 is made up of multiple branches further, to four sides centered by trunk part 10
Radiation is come, and each branch is separated into two twig at certain absolute altitude, constitutes imitative tree.This
Branch in invention is octagon steel pipe variable cross-section, and the node of tree mainly has trunk part top
Ball node, the node of divergence of each branch in branch part, and the top of branch part and net shell
Connect node.
Base surface in the present invention is the large-scale floor face constructed, such as basement roof, greatly
Construct before the construction of type tree, the maximum upper 75T truck crane of only permission.Tree
With neighboring buildings and massif all very close to, part branch is difficult to lie low；Tree projected area is relatively big,
Branch position is higher, sets up that full hall scaffold is time-consuming takes a lot of work, Assembly in pieces at height that tree is conventional and
Subdivision Method for Installation is the most inapplicable.Therefore, the large-scale tree of the present invention rotate and upgrade construction method
Propose one and rotate and upgrade construction method, and by its first Application in large-scale tree engineering.
Do not wait weight difficult point for the double branches occurred in engineering, propose again non-on the basis of Synchronous lifting scheme
The prioritization scheme of Synchronous lifting.Synchronous lifting and asynchronous lifting two schemes are all executed by the present invention
Work full-procedure tracing analysis, and carried out Monolithic Stability Analysis to promoting pylon.
Refering to shown in Fig. 4, the large-scale tree of the present invention rotate and upgrade construction method mainly include as
Lower step:
S001., the trunk part of large-scale tree is installed on base surface；
S002. on trunk part, set up lifting pylon, and in promoting, lifting means is installed on pylon；
S003. the branch part of large-scale tree is sling to position to be hoisted, by branch part with
Trunk part is hinged, and draws between branch part and lifting means and set raising cord device；
S004. starting lifting means, raising cord device is lifted up branch part, make branch part around
Articulated position rotates and upgrades to described trunk part；
S005. after branch part rotates and upgrades and puts in place, to described branch part and described trunk part
It is fixed.
When step S001. installs the trunk part 10 of large-scale tree on base surface, also wrap
Include to draw between base surface and lifting pylon 11 and set wind cable 16, carry out supporting to promoting pylon.
Wherein, coordinating shown in Fig. 5～9, lifting means includes being located at and promotes the of both sides, pylon 11 top
One lifter 111 and the second lifter 112, raising cord device includes being connected to the first lifter 111
On the first raising cord 121 and the second raising cord 122 of being connected on the second lifter 112.At this
In invention, the first raising cord 121 and the second raising cord 122 are respectively adopted steel strand wires, the first lifter
111 and second lifter 112 be hydraulic jack.
The method that rotates and upgrades in the present invention needs also exist for division unit, needs the tree to large-scale tree
Branch part carries out classifying rationally, therefore, is slinging the branch part of large-scale tree to be hoisted
Before position, previously according to geometric properties and the field condition of large-scale tree, by large-scale tree
Branch part be divided into and organize lift unit more, and make often to organize in lift unit including at least being positioned at trunk
First branch 131 and the second branch 132 of part 10 both sides, corresponding first branch 131 and the second tree
Branch 132 position to be hoisted, base surface is arranged ground moulding bed 21 assembled and welding each group of lifting
First branch 131 and the second branch 132 of unit, as it is shown in figure 5, to be assembled, welded after,
Light weight crane 14 is directly used to sling the first branch 131 and the second branch 132 on the spot to position to be hoisted
Put, as shown in Figure 6, it is to avoid full hall scaffold and large lifting equipment admission are set up in scene.
When the branch part of large-scale tree is sling to position to be hoisted by step S003., successively
Sling and often organize the first branch 131 and the second branch 132 of lift unit, utilize the first lifter 111,
Second lifter the 112, first raising cord 121 and the second raising cord 122 will often organize lift unit successively
The first branch 131 and the second branch 132 rotate and upgrade the trunk part 10 to large-scale tree
On.Wherein, specifically can by following steps utilize first lifter the 111, second lifter 112,
One raising cord 121 and the second raising cord 122 are by the first branch 131 and second of each group of lift unit
Branch 132 rotates and upgrades to trunk part 10:
Sling current the first branch 131 organizing lift unit, by the first end of this first branch 131 with
Trunk part 10 is hinged, and between second end and the first lifter 111 of this first branch 131
Draw and set the first raising cord 121, as shown in Figure 6；
Sling current the second branch 132 organizing lift unit, by the first end of this second branch 132 with
Trunk part 10 is hinged, and between second end and the second lifter 112 of this second branch 132
Draw and set the second raising cord 122, as shown in Figure 6；
Starting the first lifter 111, the first raising cord 121 is lifted up the second of the first branch 131
End, make the first branch 131 rotate and upgrade around pin joint, until the first branch 131 is rotated and upgraded to
On trunk part 10, as shown in Figure 7 and Figure 8；
Starting the second lifter 112, the second raising cord 122 is lifted up the second of the second branch 132
End, make the second branch 132 rotate and upgrade around pin joint, until the second branch 132 is rotated and upgraded to
On trunk part 10, as shown in Figure 7 and Figure 8.
Further, treat currently to organize the first branch 131 of lift unit and the second branch 132 rotates and carries
Rise after putting in place, need to promote the first branch 131 of the lift unit put in place and the second branch 132 with
Trunk part 10 is fixed, and specifically includes step:
After the first branch 131 currently organizing lift unit rotates and upgrades and puts in place, by the first branch 131
Weld with the docking node of trunk part 10, and install first in the lower section of the first branch 131
Support frame 151 is supported, and releases the first raising cord 121 and binding of the first branch 131, unloads
Remove the load on the first raising cord 121 and the first lifter 111, for the of next group lift unit
One branch uses, as shown in Figure 9；
After the second branch 132 currently organizing lift unit rotates and upgrades and puts in place, by the second branch 132
Weld with the docking node of trunk part 10, and install second in the lower section of the second branch 132
Support frame 152 is supported, and releases the second raising cord 122 and binding of the second branch 132, unloads
Remove the load on the second raising cord 122 and the second lifter 112, for the of next group lift unit
Two branches use, as shown in Figure 9.
As the better embodiment of the present invention, when the weight etc. of the first branch in each group of lift unit
When the weight of the second branch, when starting the first lifter and the second lifter, select synchronous averaging
This first lifter and this second lifter, by the first branch in each group of lift unit and the second tree
Branch synchronized rotating hoisting is on trunk part.Above-mentioned method for improving is referred to as the synchronization of the weights such as double branches by us
Method for improving.
But, when the weight of the first branch in each group of lift unit and the second branch is unequal, and phase
When difference is bigger, when being more than the weight of the second branch such as the weight of the first branch；Starting the first lifter
And second before lifter, pre-prior between the second end and the bottom of described trunk part of the second branch
Draw and set dorsal funciculus；When starting the first lifter and described second lifter, select first to start the first lifting
Device, the first raising cord is lifted up the second end of the first branch, rotates and upgrades the first branch to trunk
In part；Restarting the second lifter, under the effect of dorsal funciculus, the second raising cord is lifted up second
Second end of branch, rotates and upgrades the second branch to described trunk part.We are by above-mentioned lifting
Method is referred to as double branch and does not wait the asynchronous method for improving of weight.
The Synchronous lifting method of the weights such as double branches and double branch is further illustrated below in conjunction with specific embodiment
Do not wait the asynchronous method for improving of weight.
In the present embodiment, branch part is made up of 6 groups of lift units, often a tool in group lift unit
There are 2 branches: the first branch and the second branch, and this first branch is positioned at trunk with this second branch
The both sides of part.It is divided into 6 groups to promote in 12 branches, the packet of branch part and lifting order
As shown in Figure 10, " 1-A " represents the first branch in that group lift unit promoted for the first time,
" 1-B " represents the second branch in that group lift unit promoted for the first time, and " 2-A " represents the
The first branch in that group lift unit of second lift, " 2-B " represents that of second time lifting
The second branch in group lift unit, by that analogy, and often organizes the lifting flow process of lift unit the most as above
Described.Wind cable 16 is distributed in the surrounding promoting pylon.Often organize the lifting flow process of lift unit the most as above
Described.Wherein, the weight of branch 1-A is about 69.54T, and the weight of branch 1-B is about 15.47T,
The weight of branch 2-A is about 66.03T, and the weight of branch 2-B is about 17.26T, the weight of branch 3-A
Amount is about 65.41T, and the weight of branch 3-B is about 16.53T, and the weight of branch 4-A is about 35.81T,
The weight of branch 4-B is about 26.48T, and the weight of branch 5-A is about 54.00T, the weight of branch 5-B
Amount is about 26.27T, and the weight of branch 6-A is about 29.98T, and the weight of branch 6-B is about 30.32T,
Therefrom it appeared that this engineering promotes individual difficult point: often group lift unit does not wait weight for double branches, if with
Step promotes two branches in one group of lift unit, can make to carry about lifting pylon in lifting process
Rising rope force unbalance, a uneven Suo Li part is born by pulling wind rope 16, and remaining part is to promoting pylon
Bottom produces bigger tilting moment.So, not only make promote pylon and pull the design of wind rope the most more
Difficulty, and lifting process there is also potential safety hazard.
Synchronous lifting scheme:
The scheme of two branches simultaneously promoted in one group of lift unit is referred to as Synchronous lifting scheme.Ginseng
Read shown in Figure 11 and Figure 12, during rotating and upgrading, the first branch 131 and the second branch 132
For mechanism kinematic, the first raising cord 121 draws to be located at the first branch 131 and promotes between pylon 11, the
Two raising cords 122 draw to be located at the second branch 132 and promotes between pylon 11, the first raising cord 121
Being continually changing with the Suo Li of the second raising cord 122, branch lifts by crane stage in place and lifting and puts in place rank
The hawser power of section occurs to lift by crane the stage in place, for 1209.99KN at branch.But now first carry
The Suo Li rising rope 121 and the second raising cord 122 differs greatly, and the Suo Li of the first raising cord 121 is about
1209.99KN, the Suo Li of the second raising cord 122 are about 218.547KN, and left and right out-of-balance force is by carrying
Rise pylon 11 and wind cable (not showing wind cable in figure) bears, wind cable hawser power
1089.4KN。
Asynchronous lifting scheme:
It can be seen that double branches of lift unit not etc. do not remake into lifting from the analysis of Synchronous lifting scheme
Rope force unbalance, makes again the Suo Li of wind cable excessive.Pull wind rope as construction safeguard, typically
Not should bear the biggest Suo Li, Synchronous lifting scheme still has optimization space.Thus the present invention proposes asynchronous
Promote new departure.The most often two asynchronous liftings of branch in group lift unit, first promote heavier one
Individual, another still needs to hang raising cord, at one dorsal funciculus of bottom drawknot.As shown in Figure 13 and Figure 14,
The weight of the first branch 131 is more than the weight of the second branch 132, and the first raising cord 121 draws is located at the
Between one branch 131 and lifting pylon 11, the second raising cord 122 draws to be located at the second branch 132 and carries
Rise between pylon 11, further, between the second raising cord 122 and the bottom of trunk part 10
Draw and set one dorsal funciculus 17.Branch lifts by crane the stage in place and heavier branch promotes and puts in place the stage, Synchronous lifting
Scheme and the first raising cord 121 and Suo Li of the first raising cord 121 in asynchronous lifting scheme two scheme
Difference contrast is as shown in table 1.Can be seen that the first raising cord 121 hawser power is still for 1209.99KN not
Become, but lift by crane the difference of the Suo Li of stage the first raising cord 121 in place and the first raising cord 121 by originally
991.44KN be reduced to 252.05KN, reduce 74.6%.Lifting puts in place stage the first raising cord 121
It is reduced to 3.37KN with the difference of the Suo Li of the first raising cord 121 by original 421.26KN, reduces
99.2%.The Suo Li pulling wind rope (not showing wind cable in figure) is reduced to by original 1089.4KN
587.1KN, reduce 46.1%.These all illustrate that asynchronous lifting scheme has relative to Synchronous lifting scheme
There is superiority.
Table 1: two scheme raising cord contrasts with wind cable power
The construction overall process of the construction method of the large-scale dendritic structure of the present invention has carried out trace analysis, specifically
As follows:
For ensureing lifting process safety, this is respectively to the Synchronous lifting carried above and asynchronous lifting two
Scheme has all carried out construction overall process trace analysis, and branch part has 6 groups of lift units, therefore draws
Points 6 construct greatly step, and each construction step in 6 construction steps greatly can divide again lifting and two stages of lifting,
Therefore, constituting 12 stages, the analysis model in 12 stages is as shown in Figure 15～20.By right
The construction overall process trace analysis of two schemes, the present invention has carried out relative analysis to every result of calculation.
Promote cable force during promoting each staged construction to change as shown in figure 21, can from figure
Going out, the first raising cord (A rope) Suo Li of two lifting schemes is identical, and asynchronous lifting scheme
Second raising cord (B rope) Suo Li is more than Synchronous lifting scheme, and therefore Synchronous lifting scheme carries whole
During Shenging, the difference of two cable forces will be more than asynchronous lifting scheme.It addition, two schemes are all on the 1st rank
The difference of section least favorable, i.e. raising cord power is maximum.
The back of the body cable force of asynchronous lifting scheme overall process changes as shown in figure 22, the most different
The back of the body cable force of step lifting scheme is relatively big, front 3 construction step even greater than maximum lift cable forces, after
The reason of 3 construction step back of the body cable force reductions is that the weight differential of rear 3 groups of branches is less.
Lifting process is pulled wind rope hawser power change as shown in figure 23, it can be seen that asynchronous
The wind rope hawser power of pulling of lifting scheme is significantly less than Synchronous lifting scheme, only at the 4th and the 6th two
Construction step two schemes are close, and close reason is that two branch weight in this construction step are close.
Lifting process promotes tower top maximum displacement change as shown in figure 24, can from figure
Going out, the lifting pylon tower top displacement of two schemes all reaches maximum in the 1st construction step, in the 6th construction step
Minimize.The tower top displacement of asynchronous lifting scheme is all significantly less than synchronization scenario in each stage of lifting,
Wherein the tower top Displacement Ratio of the 4th and 6 two construction step two schemes is closer to.
Above relative analysis shows, in the main construction stage, asynchronous lifting scheme is the most excellent in many aspects
In Synchronous lifting scheme, therefore the lift unit of front 5 groups of branches is used asynchronous lifting by final scheme
Construct.The lifting of the lift unit of last group branch is the most essentially equal because of two branch total amounts,
Synchronous lifting performance is better than asynchronous lifting, uses Synchronous lifting scheme.
The construction method of the large-scale dendritic structure of the present invention also to promote pylon design carry out with monolithic stability
Analyze and improve, specific as follows:
To make to promote tower bottom tilting moment relatively big for the difficult point of the example engineering weight such as not above, promotes tower
Erection is haggled over for difficulty, need to carry out project setting.Prioritization scheme is 4 strings by promoting tower bottom
Bar is changed into intersecting at a bit by original stand up position, and junction point sets ball hinged support the top with trunk part
Portion's node connects.Thus lifting pylon has been become from entirety press-bending system the shuttle of an axial compression
Shape mast.Through analyzing, promote pylon maximum stress and drop to 0.428 than by original 1.218.
Promoting pylon is to promote key member, need to carry out global stability analysis.ANSYS is used to build
Vertical pylon block mold, boundary condition is that bottom node is hinged, top node constraint X and Y-direction translation
Degree of freedom.Unit uses BEAM188, each joint pylon chord member 10 beam elements of segmentation.Pylon material
Material is Q235B, elastic modelling quantity 206Gpa, and constitutive model uses bilinearity kinematic hardening Model B KIN.
Top-loaded value is 1720KN.Structure is carried out buckling analysis, obtains front 4 rank buckling modes such as figure
Shown in 25.Can be seen that the 1st order mode state is Y-direction flexural buckling, the 2nd order mode state is that x bends to bending
Song, buckling coefficient is all 57.646, and Buckling Loads is 99151.12KN.3rd rank and the 4th order mode state
Being all chord member local buckling, buckling coefficient is 78.762 and 78.764.
According to the result of buckling analysis, taking the 1st order mode state is defect distribution, updates pylon geometric model.
Greatest drawback value is 2H/1000=48mm.Band defect model is carried out geometrical non-linearity flexibility analysis.
Calculate elastic load displacement curve as shown in figure 26, it will be seen that band defect monolithic stability bearing capacity constantly becomes
It is bordering on Buckling Loads.Take same band defect model, it is considered to material nonlinearity, carry out double non-linear point
Analysis, calculates load-displacement curve as shown in figure 27.It can be seen that before being loaded into 3.4 times of loads,
Structure is in elastic stage, and hereafter material enters elastoplasticity, and when being loaded into 4.1 times of loads, structure reaches
To ultimate limit state.
For verifying the correctness of numerical computations, use lattice column design public affairs in " Code for design of steel structures "
Entirety and the branch of pylon are checked by formula, and result is as shown in table 2.It can be seen that overall and point
Limb slenderness ratio is the least, and a point limb stability bearing capacity is slightly above monolithic stability bearing capacity.Monolithic stability length is thin
Though than being higher than branching stability slenderness ratio, but both slenderness ratios are relatively.
Table 2: modular formula stability Calculation
Owing to " Code for design of steel structures " uses the limit condition design based on probability theory
Method, in order to contrast with ANSYS result of calculation, result of calculation is unified to be represented for method of safety coefficients,
As shown in table 3.It can be seen that result shows that numerical result is closer to proper calculation result,
And numerical computations monolithic stability bearing capacity is slightly lower, reason is overall steady close to cause with point limb slenderness ratio
Fixed interaction, reduction amplitude is consistent with result, and result of calculation is reliable.Modular formula and numerical analysis
Result all shows that pylon meets Stability Design requirement.
Table 3: safety coefficient contrasts
Tree has form and the stress characteristic of space three-dimensional, needs to select suitable construction method,
Assembly in pieces at height and unit lifting method are the construction methods that tree is conventional.The present invention is directed to large-scale tree
Shape structure proposes the method for rotating and upgrading, and is applied in certain large-scale tree engineering.According to reality
In the engineering of border, the double branch of tree does not waits the feature of weight, carried out herein asynchronous lifting scheme optimization,
Construction overall process trace analysis and lifting pylon Monolithic Stability Analysis, it is concluded that as follows:
1) conventional Assembly in pieces at height and unit lifting method are not suitable for complex large-sized tree, use
The method of rotating and upgrading can obtain preferable techno-economic effect.
2) if double branches etc. are heavy when employing rotates and upgrades method, can be with Synchronous lifting.If double branches do not wait weight, with
Step lifting scheme exists left and right rope force unbalance, pull that Feng Suoli is excessive and tower design is difficult etc. many lacks
Point, the scheme using asynchronous lifting to add dorsal funciculus can overcome the shortcoming of synchronization scenario, ensures and promoted
Cheng Anquan.
3) if employing rotates and upgrades double branches during method and do not waits weight, it is adjusted to, by promoting pylon, the axle that two ends are hinged
Heart pressurized fusiformis post, can avoid not etc. not bringing up again liter tilting moment produced, be substantially reduced pylon stress.
4), after tower design project setting, it is carried out monolithic stability numerical analysis, and by analysis result
With proper calculation Comparative result.Result shows that numerical result is closer to proper calculation result,
It is satisfied by Stability Design requirement.The slightly lower reason of numerical value bearing capacity is overall close with point limb slenderness ratio makes
The stable interaction become.
Above in association with drawings and Examples, the present invention is described in detail, ordinary skill in this area
The present invention can be made many variations example by personnel according to the above description.Thus, some in embodiment is thin
Joint should not constitute limitation of the invention, the present invention by the scope that defines using appended claims as
Protection scope of the present invention.
Claims (10)
1. a large-scale tree rotate and upgrade construction method, it is characterised in that include step:
The trunk part of large-scale tree is installed on base surface；
On described trunk part, set up lifting pylon, and lifting means is installed on described lifting pylon；
The branch part of large-scale tree is sling to position to be hoisted, by described branch part and institute
State trunk part to be hinged, and draw between described branch part and described lifting means set raising cord dress
Put；
Starting described lifting means, described raising cord device is lifted up described branch part, makes described
Branch part rotates and upgrades to described trunk part around articulated position；
After described branch part rotates and upgrades and puts in place, described branch part and described trunk part are entered
Row is fixing.
Large-scale tree the most as claimed in claim 1 rotate and upgrade construction method, its feature exists
In, the branch part of large-scale tree being sling to position to be hoisted, in advance by large-scale tree-shaped
The branch part of structure is divided into organizes lift unit more, often organizes described lift unit and includes being positioned at described tree
First branch of stem portion both sides and the second branch；
When the branch part of large-scale tree is sling to position to be hoisted, sling successively and often organize institute
State described first branch of lift unit and described second branch, utilize described lifting means and described in carry
Rise rope device successively described first branch and described second branch of often organizing described lift unit to be rotated and carried
Rise on described trunk part.
Large-scale tree the most as claimed in claim 2 rotate and upgrade construction method, its feature exists
In: described lifting means includes that the first lifter and second being located at described lifting tower top both sides carries
Rising device, described raising cord device includes the first raising cord connecting described first lifter and connects described
Second raising cord of the second lifter.
Large-scale tree the most as claimed in claim 3 rotate and upgrade construction method, its feature exists
In, utilize described lifting means and described raising cord device will to promote described in each group by following steps
Described first branch and described second branch of unit rotate and upgrade to described trunk part:
Sling described first branch of described lift unit, by the first end of described first branch with described
Trunk part is hinged, and draws between second end and described first lifter of described first branch and set
Described first raising cord；
Sling described second branch of described lift unit, by the first end of described second branch with described
Trunk part is hinged, and draws between second end and described second lifter of described second branch and set
Described second raising cord；
Starting described first lifter, described first raising cord is lifted up the second of described first branch
End, rotates and upgrades described first branch to described trunk part；
Starting described second lifter, described second raising cord is lifted up the second of described second branch
End, rotates and upgrades described second branch to described trunk part.
Large-scale tree the most as claimed in claim 4 rotate and upgrade construction method, its feature exists
In: the weight of described first branch is equal to the weight of described second branch；Promote starting described first
When device and described second lifter, the first lifter described in synchronous averaging and described second lifter, will
On described first branch and described second branch synchronized rotating hoisting extremely described trunk part.
Large-scale tree the most as claimed in claim 4 rotate and upgrade construction method, its feature exists
In: the weight of described first branch is more than the weight of described second branch；
Before starting described first lifter and described second lifter, in advance prior to described second branch
Draw between the bottom of the second end and described trunk part and set dorsal funciculus；
When starting described first lifter and described second lifter, first start described first lifter,
Described first raising cord is lifted up the second end of described first branch, is rotated by described first branch and carries
Rise on described trunk part；Restart described second lifter, under the effect of described dorsal funciculus, institute
State the second raising cord and be lifted up the second end of described second branch, described second branch is rotated and upgraded
To described trunk part.
Large-scale tree the most as claimed in claim 2 rotate and upgrade construction method, its feature exists
In, after described branch part rotates and upgrades and puts in place, described branch part and described trunk part are entered
The step that row is fixed includes:
After described first branch often organizing described lift unit rotates and upgrades and puts in place, by described first tree
Branch docks with described trunk part, and installs the first support jig in the lower section of described first branch
It is supported；
After described second branch often organizing described lift unit rotates and upgrades and puts in place, by described second tree
Branch docks with described trunk part, and installs the second support jig in the lower section of described second branch
It is supported.
Large-scale tree the most as claimed in claim 1 rotate and upgrade construction method, its feature exists
In: described lifting pylon uses the axial compression fusiformis post that two ends are hinged, described lifting tower bottom
Chord member intersects at a bit, and arranges ball hinged support in remittance point of intersection, and described lifting pylon passes through described ball
Hinged-support is connected with the top of described trunk part.
Large-scale tree the most as claimed in claim 1 rotate and upgrade construction method, its feature exists
In: when setting up lifting pylon on described trunk part, also it is included in described base surface and described lifting
Draw between pylon and set wind cable.
Large-scale tree the most as claimed in claim 1 rotate and upgrade construction method, its feature exists
In: described base surface is the floor face constructed, and uses light weight crane described branch part to be hung
Rise to position to be hoisted.
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