CN101100902A - Inclined drawing steel truss high-supported formwork structure system and construction method thereof - Google Patents
Inclined drawing steel truss high-supported formwork structure system and construction method thereof Download PDFInfo
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- CN101100902A CN101100902A CNA2007100254578A CN200710025457A CN101100902A CN 101100902 A CN101100902 A CN 101100902A CN A2007100254578 A CNA2007100254578 A CN A2007100254578A CN 200710025457 A CN200710025457 A CN 200710025457A CN 101100902 A CN101100902 A CN 101100902A
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Abstract
This is a cable stayed steel truss module structure and its construction method. At least two steel trusses are installed to support a high building to be grouted with connecting steel held in between. At least four truss cables are stayed between the building and the steel truss. Beam is installed on the top of the truss with falsework module fixed to the beam.
Description
One, technical field
The present invention relates to a kind of building operations formwork structural system, a kind of specifically inclined drawing steel truss high-supported formwork structure system the invention still further relates to the job practices of this inclined drawing steel truss high-supported formwork structure system.
Two, background technology
In the contour big hall superstructure cast-in-place concrete structure construction of the communal space of highrise building conjoined structure, public building, the total collapse of tall and big formwork causes the serious accident of many people injures and deaths to happen occasionally, and the Ministry of Construction also classifies the construction safety of tall and big formwork engineering as the content of key-point management.For the formwork of tall and big hall cast-in-place concrete building roof construction, conventional job practices is for adopting fastener type steel pipe scaffold by ground full hall framed bent formwork.But when this method surpassed 20m when the formwork height, not only pin hand steel pipe and fastener consumption were huge, set up the labour cost height, and superelevation lands the power transmission complexity of fastener steel tube support for shuttering, and potential safety hazard is many.
Three, summary of the invention
Technical problem to be solved by this invention provides a kind of inclined drawing steel truss high-supported formwork structure system, this system is applicable to the high-supported formwork construction of high-altitude large-span steel-reinforced concrete building cover structures such as conjoined structure between the tall and big hall of public building or highrise building high building, the particularly turnover of the concrete floor of multi-level high spatial (as indoor hanging garden or indent large platform hanging garden), avoid the superelevation support to land and set up, reduced the whole unstability risk of superelevation support.In addition, the present invention also provides the job practices of this inclined drawing steel truss high-supported formwork structure system.
A kind of inclined drawing steel truss high-supported formwork structure system of the present invention, it is characterized in that: it comprises, and the steel truss of primary load bearing, contact steel support, truss tiltedly draws and hangs muscle, crossbeam and the support of steel pipe scaffold template, described at least two steel trusss are the two end supports form and are arranged on building up on the fabric structure under the high-altitude long-span reinforced concrete floor to be built, each is organized between the steel truss by the contact steel is set and supports the plane stability that increases steel truss, and at least four truss tiltedly draw and hang the muscle both sides and tiltedly hang between the constructure body structure that is pulled in steel truss and has built up symmetrically; Be fixed on the steel truss top, the steel pipe scaffold template supports and then sets up on crossbeam girder space.
Truss tiltedly draws the drawknot point that hangs between muscle and the steel truss can adopt lengthening roll extrusion straight thread reinforced bar sleeve to do nut and fixes.
Steel truss can adopt the shellfish thunder frame or the military girder truss of finished product, also can adopt the shaped steel truss of design voluntarily and building site processing and fabricating.
The job practices of above-mentioned inclined drawing steel truss high-supported formwork structure system may further comprise the steps:
1, the making of steel truss
1.1, earlier backing plate and run-on tab be installed, same node should weld the edge of a wing of burn-oning again, bottom flange earlier, an end of weldering beam welds the other end of beam more earlier;
1.2, Truss Joint welding welds by the weld bead height of designing requirement, general plug weld height is 5mm, the two sides weld seam is all adopted in the shaped steel welding, the fillet weld height of angle steel welding is general 5mm, all the other unreceipted place weld bead heights generally are 8mm;
1.3, shaped steel rod member and gusset plate adopt the two sides fillet weld, every fusion length is the depth of section that is not less than shaped steel, when the two sides weld seam can not guarantee, adopts three weld all arounds;
2, steel truss is installed
2.1, steel truss after the making place of construction site completes, utilize the existing tower crane in construction site to finish lifting work, the strict loop wheel machine supporting capacity of confirming hoisted in position point, sectional making in case of necessity, segmentation installation;
2.2, steel truss is installed in two-layer flooring place under tall and big hall concrete floor to be poured, the bolt position of fixed bearing is embedded in steel truss installation aspect place, in conjunction with the actual processing dimension of steel truss location;
2.3, the lateral ties steel is supported on the job site assembly unit between steel truss;
2.4, truss should on-the-spot pre-piece together before tiltedly drawing and hanging muscle and bury underground, guarantee tiltedly to draw the setting angle that hangs muscle and steel truss correct, and in same plane of constraint;
2.5, truss tiltedly draws to hang and uses cutting machine before the muscle roll extrusion mantle fiber processing and cut flatly, guarantees the quality of mantle fiber;
2.6, the position that contact of the shaped steel of steel truss upper chord and quadrature discharging should polish flat, assurance shaped steel steadily is shelved on the steel truss; Shaped steel and steel truss upper chord node adopt pressing plate spacing fixing, guarantee that shaped steel does not produce slippage;
2.7, on the shaped steel crossbeam by the design pitch welding vertical rod socket joint sleeve pipe of top framed bent, casing inner diameter 50mm, height 80～100mm guarantees that the vertical rod of formwork framed bent do not slide when pumping of concrete is built;
Steel truss is removed
3.1, can form removal when being reached 100% design strength by the same condition curing concrete intensity of test block of the tall and big hall concrete floor system of being built, after steel truss treated that upper mould and steel pipe supporting row frame load are all laid down, ecto-entad was removed steel truss by Pin;
3.2, steel truss remove to adopt hang at 2, hoisting point position welding round steel suspension ring, suspension ring are installed as suitable not influence framed bent;
3.3, steel truss removes according to design feature, makes full use of hanging device, formulates suitable Hoisting Program, and can guarantee that tower crane is not subjected to horizontal traction force by the Chain block translation, guarantees safety.
3.4, after the steel truss center goes out floor, tower crane can directly be maneuvered into assigned address with it, truss is checked after winching to ground, guarantee guarantees the integrity when next time, turnover utilized.
In the steel truss making step, for a Pin steel truss, the welding sequence of node should form framework earlier in the middle of total, outwards expansion welding of back.
In the steel truss installation steps, can increase in addition at steel truss bearing place anti-impact cut steel bar stress and stretch into side bar or post within the walls length be not less than 300mm.
The present invention is according to applied engineering structures characteristics, and steel truss can adopt the shellfish thunder frame or the military girder truss of finished product, also can adopt the shaped steel truss of design voluntarily and building site processing and fabricating.Tiltedly hang and draw the steel truss can be by the existing tower crane Fast Installation in construction site, the degree of safety height of installation, the load power transmission is clear, and can adjust the antiarch amount of steel truss.
Draw steel truss as basic bottom load-carrying construction with tiltedly hanging, the contact jack truss is set between truss, increased the plane stability of steel truss.Lay shaped steel above steel truss, by normal fastener steel tube framed bent formwork, the formwork height generally is no more than two floors.The practicality of oblique rollering steel rise of a truss formwork scheme, formwork-support does not land to be set up, at utmost utilized the building site routine circulation material, reusable, laborsaving, economize material, good economy performance.
Can utilize crescent moon rib shape bar reinforcement to do suspending bars, can gather materials on the spot on the building site, it is firm that suspending bars is embedded into the concrete structure anchoring.The drawknot point of reinforcing bar suspending bars and steel truss adopts lengthening roll extrusion straight thread reinforced bar sleeve to do nut and fixes, easy to process, suspending bars is pulled on the concrete main body structure that has certain intensity, forms effectively unloading power transmission, and has the second road high-supported formwork security perimeter effect.
After large span steel truss tiltedly drawn, between striding a little shelved at two ends, increased the fulcrum of steel truss, can reduce the height of steel truss and optimize the steel using amount of steel truss, also reduced of the requirement of whole Pin lifting steel truss building site tower crane lift heavy ability.
When the steel truss span is big, can adopt segmental hoisting behind the steel truss sectional making, segmentation is hung and is drawn.Lift the both sides section earlier and fix back lifting interlude, assembly unit connection in concrete structure.The method can realize that tower crane lift heavy ability hour or arm can both carry out the installation of steel truss when long.
Four, description of drawings
Fig. 1 is the layout plan of inclined drawing steel truss high-supported formwork structure system of the present invention;
Fig. 2 is the transverse cross-sectional view of Fig. 1;
Fig. 3 is the longitudinal sectional drawing of Fig. 1;
Fig. 4 is a steel truss diagonal member place node drawing;
Fig. 5 is a steel truss diagonal member node place sectional drawing;
Fig. 6 is a construction flow chart of the present invention.
Five, the specific embodiment
As shown in Figure 1-Figure 3, a kind of inclined drawing steel truss high-supported formwork structure system of the present invention, it comprises the steel truss 1 of primary load bearing, the contact steel supports 2, truss tiltedly draws and hangs muscle 3, crossbeam 4 and steel pipe scaffold template support 5, four steel trusss 1 are the two end supports form and are arranged on building up on the fabric structure under the high-altitude long-span reinforced concrete floor to be built, each is organized between the steel truss 1 by the contact steel is set and supports 2 plane stabilities that increase steel trusss, and four truss tiltedly draw and hang muscle 3 both sides and tiltedly hang between the constructure body structure that is pulled in steel truss 1 and has built up symmetrically; Crossbeam 4 compartment of terrains are fixed on the steel truss top, and the steel pipe scaffold template supports 5 and sets up on crossbeam 4, the tall and big Zhongting flooring 6 of building on the basis of steel pipe scaffold template support 5.Steel truss 1 can adopt the shellfish thunder frame or the military girder truss of finished product, also can adopt the shaped steel truss of design voluntarily and building site processing and fabricating.Fig. 4 is that steel truss tiltedly draws and hangs muscle place node drawing, and Fig. 5 is a steel truss diagonal member node sectional drawing, and by Fig. 4 and Fig. 5 as seen, truss tiltedly draws the drawknot point that hangs between muscle 3 and the steel truss 1 to adopt lengthening roll extrusion straight thread reinforced bar sleeve to do nut and fixes.
1, technological principle of the present invention
Oblique rollering steel truss formwork system makes full use of the bearing capacity of concreting structure, adopt steel truss to adhere to (or shelving) on the structure of having built up, and utilize tiltedly to draw and hang the flexible support of muscle as the steel truss middle part, reduced to stride greatly the supporting span of steel truss, controlled the amount of deflection of steel truss span centre effectively, and the steel using amount of steel truss is further reduced, economy improves but degree of safety does not reduce.The formwork platform that forms with this slant-pull structure becomes general formwork erection on oblique rollering steel truss support platform to the superelevation formwork.Support system for the oblique rollering steel truss, by means of the construct overall calculation analysis of mechanics of finite element analysis softwares such as SAP2000, crucial rod member of control steel truss and reinforcing bar suspending bars stress ratio under least favorable construction operating mode not only guarantees safety but also do not lose economy below 0.6.
2, construction technology process and key points for operation
2.1 construction technology process
The concrete construction technology process of this worker method is seen Fig. 6.
2.2 key points for operation
2.2.1 steel truss is made
1, backing plate and run-on tab are installed earlier, same node should weld the edge of a wing of burn-oning again, bottom flange earlier, and an end of weldering beam welds the other end of beam more earlier, forbids two ends to be welded simultaneously, avoids postwelding structural distortion distortion.
2, the Truss Joint welding is welded by the weld bead height of designing requirement, and general plug weld height is 5mm, and the two sides weld seam is all adopted in the shaped steel welding, and the fillet weld height of angle steel welding is general 5mm, and all the other unreceipted place weld bead heights generally are 8mm.
3, shaped steel rod member and gusset plate adopt the two sides fillet weld, and every fusion length is the depth of section that is not less than shaped steel, when the two sides weld seam can not guarantee, adopts three weld all arounds.
4, for a Pin steel truss, the welding sequence of node should form framework earlier in the middle of total, outwards expansion welding of back.
5, the welding of steel truss is avoided the two ends of beam to weld simultaneously and be heated, produce bigger shrinkage stress in beam.
6, the steel truss welding should adopt two welders to be symmetrically welded minimizing welding deformation and welding stress.
7, all detailed record to be done to the welding procedure of every Pin steel truss, magnetic particle testing can be adopted the welding quality of steel truss fillet weld.
2.2.2 steel truss is installed
1, steel truss utilizes the existing tower crane in job site to finish lifting work making after the place completes as far as possible, before formal lifting, should the strict loop wheel machine supporting capacity of confirming hoisted in position point, and sectional making in case of necessity, segmentation installation.
2, steel truss is installed and is undertaken by organizing construction's requirement of high-supported formwork scheme, generally be installed in two-layer flooring place under tall and big hall concrete floor to be poured, the bolt position of fixed bearing should be embedded in steel truss mounting layer place according to the steel truss construction drawing, in conjunction with the actual processing dimension of steel truss location.
3, steel truss bearing place increase in addition anti-impact cut steel bar stress and stretch into side bar or post within the walls length be not less than 300mm.
4, lateral ties bridging assembly unit at the construction field (site) between steel truss, the bolt that should be designed to that uses for turnover connects, and is convenient to prefabricated construction, and should controls the processing dimension error.
5, should on-the-spotly piece together in advance before steel truss hangs and draws reinforcing bar to bury underground, guarantee to hang to draw the setting angle of reinforcing bar and steel truss correct, and in same plane of constraint.
6, truss tiltedly draws to hang and uses cutting machine before the muscle roll extrusion mantle fiber processing and cut flatly, guarantees the quality of mantle fiber.
7, the steel truss upper chord should polish flat with the position that the shaped steel of quadrature discharging contacts, and guarantees that shaped steel steadily is shelved on the steel truss.Shaped steel and steel truss upper chord node adopt pressing plate spacing fixing, guarantee that shaped steel does not produce slippage.
8, weld vertical rod socket joint sleeve pipe by the design pitch of top framed bent on the shaped steel crossbeam, in the sleeve pipe
Footpath 50mm, height 80～100mm, the vertical rod of assurance formwork framed bent is not slided when pumping of concrete is built.
2.2.3 steel truss is removed
Can form removal when 1, the same condition curing concrete intensity of test block of the tall and big hall concrete floor system of being built reaches 100% design strength.After steel truss treated that upper mould and steel pipe supporting row frame load are all laid down, ecto-entad was removed steel truss by Pin.
2,2 of steel truss dismounting employings are hung, hoisting point position welding φ 16 round steel suspension ring, and suspension ring are installed as suitable not influence framed bent.
3, steel truss is removed according to design feature, makes full use of hanging device, formulates suitable Hoisting Program, and can guarantee that tower crane is not subjected to horizontal traction force by the Chain block translation, guarantees safety.
4, after the steel truss center went out floor, tower crane can directly be maneuvered into assigned address with it.Truss is checked after winching to ground, and guarantee guarantees the integrity when next time, turnover utilized.
3, material and equipment
3.1 material requirements
3.1.1 steel truss can adopt Q235 shaped steel to be welded, the technical requirements that the shaped steel test specimen stretches, clod wash all should meet Q235 among " structural carbon steel " GB700.
3.1.2 tiltedly draw and hang muscle and adopt HRB400 φ 20～32 reinforcing bars, steel bar stretching, clod wash all should meet the technical requirements of " steel concrete with hot band rib steel muscle " GB1499.
3.1.3 the straight thread connecting sleeve test specimen hot strength that adopts when connecting should meet the technical requirements of " reinforcing steel bar machinery connects the current techique rules " JGJ107 I level joint, and adopts the branch sleeve of lengthening.
3.1.4 it is big hexagonal friction-type that the contact bridging between steel truss connects the high-strength bolt that adopts, strength grade is 8.9 grades, and its material and mechanical performance should meet respective specified among " steel work with the big turret head of high strength, heavy series hexagon nut, gasket techniques condition " GB1231.
3.1.5 shaped steel
The welding production of truss adopts fillet weld, and the weld seam grade is 3 grades, welding rod model E4303.Welding material should leave in dry indoor by the trade mark, kind respectively, welding rod before use should by on the certificate of merchandise or process stipulation cure and dry.
Adopt special use specially to put 3.1.6 steel are stacked, prevent to put with other materials is mixed.
3.1.7 check before steel are marched into the arena that material, specification, thickness, length etc. meet the drawing requirement, the steel after marching into the arena must be painted on shaped steel and be made a check mark.
3.1.8 the material surface that uses must not have scarce fillings such as iron rust, scar, crack, bark pocket, repairs as need, must handle relevant formalities.
3.1.9 material department must provide the material list of steel according to plan blanking forward direction producer, so that reasonable materials and definite stitching position.
3.2 plant
The used plant of the present invention sees Table 3.2.
Table 3.2 plant table
| Sequence number | Title | Specifications and models | Quantity | Purposes | |
| 1 | A.C. welder | BX1-500 | 4 | The assembly unit welding | |
| 2 | Tower crane | QTZ80 (or other models) | 1 | The lifting |
|
| 3 | | 3t | 2 | The tension suspension rod is installed the |
|
| 4 | The reinforced bar straight thread processing machine | 1 | Processing suspension rod end |
||
| 4 | The oxy- |
2 covers | |
||
| 5 | Sander | Hand-held | 2 | Polishing, rust cleaning | |
| 6 | Spirit level | 2m | 1 | Check planeness | |
| 7 | Level gauge | DS3 | 1 | Assembly unit is measured | |
| 8 | Transit | DJ2 | 1 | Assembly unit is measured |
4, quality control
4.1 quality specifications
4.1.1 carry out " construction steel structure solder technology rules " JGJ81 when steel truss is made welding procedure, the presentation quality of three grades of weld seams should meet the relevant regulations of showing 4.1.1.
Three grades of weld appearance quality of table 4.1.1 steel truss allowable variation table
| Item | Inspection item | Allowable variation |
| 1 | Incompletely filling | Incompletely filling cumulative length≤25mm in≤0.2+0.04t and the 2mm, every 100mm |
| 2 | Root shrinks | ≤ 0.2+0.04t and≤2mm, length is not limit |
| 3 | Undercut | ≤ 0.1t and≤1mm, length is not limit |
| 4 | Crackle | Allow to exist the crater crack of individual lengths≤ |
| 5 | Arc scratch | Allow to exist |
| 6 | Joint is bad | Notch depth≤0.1t and≤1mm, must not surpass 1 place in every 1000mm length weld seam |
| 7 | Surface pores | Allow in every 50mm length weld seam to exist diameter＜0.4t and≤2 at the pore of 3mm; Pitch-row should 〉=6 times of apertures |
| 8 | The surface slag inclusion | Deeply≤0.2t, length≤0.5t and≤20mm |
| Annotate: t is the thin thickness of slab in junction in the table. | ||
4.1.2 carry out " code for acceptance of construction quality of steel structures " GB50205 during the steel truss installation, the appearance and size after the steel truss installation should meet the relevant regulations of showing 4.1.2.
The allowable variation table of table 4.1.2 steel truss appearance and size
| Item | Inspection item | Allowable variation | Inspection method | |
| 1 | Truss span centre height | ± 10mm | Check with |
|
| 2 | Truss span centre camber | The designing requirement arch camber | ± L/5000mm | |
| The arch camber of design failed call | 10mm ,- |
|||
| 3 | Chord member bending (except the pressurized) between adjacent segments | L/1000mm | ||
| Annotate: L is a truss span in the table. | ||||
4.1.3 tiltedly draw the steel bar quality that hangs muscle to meet the technical requirements of " steel concrete with hot band rib steel muscle " GB1499, utilize on-the-spot reinforcing bar processing and fabricating.The crudy of end straight thread meets the I level joint requirement among " reinforcing steel bar machinery connects the current techique rules " JGJ107, requires thread complete when visual inspection is done at the scene, and the thread number of every end is more than 11 teeth.The connection steel bushing of lengthening should guarantee that all there is the length that connects more than 11 threads at two ends.
4.2 quality assurance measure
4.2.1 the special constructure scheme of oblique rollering steel rise of a truss formwork should be by being expounded through peer review.Before the formal construction, must carry out overall technology to the constructor who participates in and tell somebody what one's real intentions are.
4.2.2 make truss shaped steel quality assurance all information, the weldquality visual inspection is qualified, and should not be less than 20% by weld seam requirement detection weldering node.The straight thread mechanical connecting joint should be done mechanical properties test and can use after qualified.
4.2.3 strict with the process construction, after the per pass operation is intact, must through quality inspection, safety check department after the assay was approved and after approval is managed at the scene, can carry out the next procedure construction.
4.2.4 the lacing wire anchor pole that hangs of oblique rollering steel truss becomes design point of view to answer strictness to guarantee with the Vierendeel girder bottom surface when pre-buried.
4.2.5 after diagonal member bearing place structural concrete strength should reach the above requirement of strength of C25 concrete, can build the upper brace concrete.
5, performance analysis
The present invention has adopted can have enough to meet the need the load platform structure of the oblique rollering steel truss of use as the upper mould support repeatedly, has satisfied the requirement of practicality, economy and safety triplicity.Wherein, steel truss adopts common Q 235 section steel manufactures, but when span satisfies the finished steel truss also straight lease, the input expense of steel truss is not high.Do suspending bars with the building site reinforcing bar, draw materials easily, safety is also guaranteed.
Oblique rollering steel truss formwork with the permanent mansion engineering of Nanjing four seasons benevolence is an example, and whole platform propping works is only used 13 tons of shaped steel, and the scene processes voluntarily, utilizes the tower crane whole lifting, repeatedly repeat turnover and use, and simple and quick, safe and reliable.At the constructure scheme initial stage, once consider to adopt common fastener type steel pipe scaffold to land formwork, if by the framed bent vertical pole ' s span is 500mm * 700mm, step pitch is 1500mm, the shearing support is all established on four limits, and divide into two layers of full hall scaffold (strengthening requiring with this bearing capacity that satisfies high-supported formwork layer bottom floor) and calculate, only the steel pipe of high-altitude formwork layer needs about 65 tons, and consumptive material is many, security risk is big.Adopting this worker method and common fastener type steel pipe to land the scaffold building expense compares, direct cost has been saved 340,000 yuan in the permanent double tower A of Nanjing four seasons benevolence building engineering construction, direct cost has been saved 460,000 yuan in the permanent double tower B of Nanjing four seasons benevolence building engineering construction, and the corresponding construction period has also all shifted to an earlier date about 15 days.
6, application example
Below three embodiment all under confidential state, carry out in order to verify feasibility of the present invention because rise of a truss of the present invention props up mode structure i.e. dismounting after building main body completion, so there is not open anxiety.
6.1 application example one, two---the permanent mansion A of Nanjing four seasons benevolence, B building engineering
6.1.1 project profile
The permanent mansion engineering of Nanjing four seasons benevolence is located near the Olympic Sports Center, the west of a river, Nanjing the about 140000m of overall floorage
2, to form by two high buildings of underground garage and north and south, structural shape is the cast-in-situ concrete shear wall structure.
6.1.2 applicable cases
The permanent double tower A of Nanjing four seasons benevolence building engineering, going into operation is on June 20th, 2004, and completion is on February 10th, 2006, and the steel girder platform propping works is reused 3 times with 13 tons of shaped steel, oblique rollering steel truss.340,000 yuan of cost savings.
The permanent double tower B of Nanjing four seasons benevolence building engineering, going into operation is on July 10th, 2004, and completion is on March 25th, 2006, and the steel girder platform propping works is reused 4 times with 13 tons of shaped steel, oblique rollering steel truss, 460,000 yuan of cost savings.
This engineering is used in this invention process, with integral hoisting of single Pin steel truss and dismounting, has realized that repeatedly turnover is reused with tower crane, has guaranteed the safe and efficient of high-altitude formwork construction, and workmanship also is guaranteed.
6.2 application example three---1# building, square, Changzhou Yanghu Lake engineering
6.2.1 project profile
Glad 1# building, square, the Yanghu Lake engineering that reaches development of real estate parent company of Changzhou is the double tower building of concrete frame shear wall structure, the 6.375m that encorbelments respectively at 16 layers of place, and formation one is similar to the aerial conference room of disjunctor.Area is about 360m
2, vertically span is 13m.Thickness of slab 150mm, four road prestressing force crossbeam 500 * 1000～1400mm that encorbelments, secondary beam is that 300 * 600mm does not wait, and concrete adopts C30, and the disjunctor position absolute altitude of encorbelmenting is about 58.75m.This position main Construction Plan adopts reinforcing bar tiltedly to hang the high-supported formwork method of drawing four Pin steel trusss, and positive quadraturing laying 32b i iron on the steel truss is set up common fastener steel tube scaffold framed bent formwork again.
6.2.2 applicable cases
Square, the Yanghu Lake, Changzhou 1# building commencement of works date is on September 10th, 2004 for going into operation, and completion is on March 10th, 2006, and wherein steel truss is partly used 10 tons of shaped steel, and the i iron on the steel truss utilizes original material, and direct cost has been saved 340,000 yuan.
Claims (6)
1, a kind of inclined drawing steel truss high-supported formwork structure system, it is characterized in that: it comprises the steel truss (1) of primary load bearing, the contact steel supports (2), truss tiltedly draws and hangs muscle (3), crossbeam (4) and steel pipe scaffold template support (5), described at least two steel trusss (1) are the two end supports form and are arranged on building up on the fabric structure under the high-altitude long-span reinforced concrete floor to be built, each is organized between the steel truss (1) by the contact steel is set and supports the plane stability that (2) increase steel truss, and at least four truss tiltedly draw and hang muscle (3) both sides and tiltedly hang symmetrically between the constructure body structure that is pulled in steel truss (1) and has built up; Crossbeam (4) compartment of terrain is fixed on the steel truss top, and the steel pipe scaffold template supports (5) and then sets up on crossbeam (4).
2, inclined drawing steel truss high-supported formwork structure system according to claim 1 is characterized in that: truss tiltedly draws the drawknot point that hangs between muscle (3) and the steel truss (1) to adopt lengthening roll extrusion straight thread reinforced bar sleeve to do nut and fixes.
3, oblique rollering steel rise of a truss according to claim 1 and 2 props up mode structure, it is characterized in that: steel truss (1) can adopt the shellfish thunder frame or the military girder truss of finished product, also can adopt the shaped steel truss of design voluntarily and construction site processing and fabricating.
4, the job practices of the described inclined drawing steel truss high-supported formwork structure system of claim 1 is characterized in that it may further comprise the steps:
1, the making of steel truss
1.1, earlier backing plate and run-on tab be installed, same node should weld the edge of a wing of burn-oning again, bottom flange earlier, an end of weldering beam welds the other end of beam more earlier;
1.2, Truss Joint welding welds by the weld bead height of designing requirement, general plug weld height is 5mm, the two sides weld seam is all adopted in the shaped steel welding, the fillet weld height of angle steel welding is general 5mm, all the other unreceipted place weld bead heights generally are 8mm;
1.3, shaped steel rod member and gusset plate adopt the two sides fillet weld, every fusion length is the depth of section that is not less than shaped steel, when the two sides weld seam can not guarantee, adopts three weld all arounds;
2, steel truss is installed
2.1, steel truss after the making place of construction site completes, utilize tower crane to finish lifting work, the strict loop wheel machine supporting capacity of confirming hoisted in position point, sectional making in case of necessity, segmentation installation;
2.2, steel truss is installed in two-layer flooring place under tall and big hall concrete floor to be poured, the bolt position of fixed bearing is embedded in steel truss installation aspect place, in conjunction with the actual processing dimension of steel truss location;
2.3, the lateral ties steel is supported on the job site assembly unit between steel truss;
2.4, truss should on-the-spot pre-piece together before tiltedly drawing and hanging muscle and bury underground, guarantee tiltedly to draw the setting angle that hangs muscle and steel truss correct, and in same plane of constraint;
2.5, truss tiltedly draws to hang and uses cutting machine before the muscle roll extrusion mantle fiber processing and cut flatly, guarantees the quality of mantle fiber;
2.6, the position that contact of the shaped steel of steel truss upper chord and quadrature discharging should polish flat, assurance shaped steel steadily is shelved on the steel truss; Shaped steel and steel truss upper chord node adopt pressing plate spacing fixing, guarantee that shaped steel does not produce slippage;
2.7, on the shaped steel crossbeam by the design pitch welding vertical rod socket joint sleeve pipe of top framed bent, through 50mm, height 80～100mm guarantees that the vertical rod of formwork framed bent do not slide when pumping of concrete is built in the sleeve pipe;
3, steel truss is removed
3.1, can form removal when being reached 100% design strength by the same condition curing concrete intensity of test block of the tall and big hall concrete floor system of being built, after steel truss treated that upper mould and steel pipe supporting row frame load are all laid down, ecto-entad was removed steel truss by Pin;
3.2, steel truss remove to adopt hang at 2, hoisting point position welding round steel suspension ring, suspension ring are installed as suitable not influence framed bent;
3.3, steel truss removes according to design feature, makes full use of hanging device, formulates suitable Hoisting Program, and can guarantee that tower crane is not subjected to horizontal traction force by the Chain block translation, guarantees safety;
3.4, after the steel truss center goes out floor, tower crane can directly be maneuvered into assigned address with it, truss is checked after winching to ground, guarantee guarantees the integrity when next time, turnover utilized.
5, the job practices of oblique rollering steel rise of a truss formwork according to claim 4 is characterized in that in the steel truss making step, and for a Pin steel truss, the welding sequence of node should form framework earlier in the middle of total, outwards expansion welding of back.
6, according to the job practices of claim 4 or 5 described oblique rollering steel rise of a truss formworks, it is characterized in that in the steel truss installation steps, increase in addition at steel truss bearing place anti-impact cut steel bar stress and stretch into side bar or post within the walls length be not less than 300mm.
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