CN101886466B - Construction method for support structure of coal tower template for tamping type coke oven - Google Patents
Construction method for support structure of coal tower template for tamping type coke oven Download PDFInfo
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Abstract
The invention relates to a construction method for a support structure of a coal tower template for a tamping type coke oven, which comprises the following steps of 1, treating a base of a steel structure supporting platform; 2, manufacturing and installing the steel structure supporting platform; 3, prepressing the steel structure supporting platform: the prepressing materials are a resistance wall for the coke oven and a precast slab for a basement, the steel structure supporting platform is overloaded and prepressed according to 110% design load, an observing point is arranged, and the prepressing time is seven days, and the observation is carried out once a day; 4, installing each falsework of the template; and 5, removing the falsework and the steel structure supporting platform. The construction method can realize effective monitoring by well design of a large-span, high-support and heavy-load template support system, particularly is the first in the country in coal towers with a span of 34.045 meters but the beam does not have cracks, solves the difficult problem of construction of a large-span, high-support and heavy-load structure, adapts to the coking technique to be developed in large size and tamping type coke ovens, and has the advantages of short construction period, revolving material saving, safety, reliability, easy quality control and high concrete strength.
Description
Technical field
The present invention relates to the template construction method used in a kind of large-scale coking engineering projects work progress, particularly a kind of large span, high, the job practices of the support structure of coal tower template for tamping type coke oven of heavy burden.
Background technology
Stamp charging coke oven coal tower large span, height prop up, the heavy burden formwork bracing system has the space-load complexity, scaffolding height big (15.49m and 26.3m cornice), span big (34.045m), load big (dead load 1600T), and exist inhomogeneous stressed etc. in the work progress.There is following drawback in the domestic fastener type steel pipe scaffold that generally adopts as formwork bracing system at present:
1, contacting piece formula steel pipe scaffold is also very insufficient as the research of three-D space structure, and the time and the expense cost of similar calculating are high, and a lot of enterprises more do not possess such condition;
2, form bracing system rigidity is poor, is easy to generate the crack under the beam, has a strong impact on concrete structural strength and durability;
3, globality, poor stability support coal tower 1600T deadweight and have potential safety hazard, threat to life safety;
4, the steel pipe spacing is close, needs a large amount of steel pipes, and workload is big, the construction period is long, the operating expenses height.
Summary of the invention
The present invention be directed to the many deficiencies that exist in the existing construction technology, the stamp charging coke oven coal tower large span that a kind of duration is short, safe and reliable, cost of manufacture is low, high, load cast board construction method are provided.
Realize that the technical scheme that above-mentioned purpose adopts is: a kind of job practices of support structure of coal tower template for tamping type coke oven, the braced structures of this template comprises the steel work support platform that is used for support shuttering integral body, also comprise the bracing frame that is used to support each template, described job practices is carried out according to following steps:
1. the processing on steel work support platform basis:
A, base treatment: will be as the backfill compaction in layers of substrate, the thickness≤250mm of each layer, coefficient of consolidation 〉=0.96;
B, built-in fitting are handled: after base treatment was intact, building thickness was the thick steel concrete of 250mm, did at the steel column foot place to deepen to handle, and unwrapping wire is measured in the position of pressing steel column in the steel work Support Platform Design scheme, installs and makes pre-buried anchor slab in advance;
C, health handle: conditioned time 〉=7d, treat that the intensity of steel concrete in the substrate reaches 75% o'clock of design strength, installs the steel work support platform;
2. the making of steel work support platform and installation:
A, according to the setting-out of steel work form bracing system working drawing, number material, and check size and direction between the drawing one by one, sawing is adopted in the blanking of H shaped steel, i iron;
B, steel column adopt unit vertically to lift by crane, and girder steel adopts 2 colligation level liftings, and steel column all is fixed on the pre-buried anchor slab;
C, in the crane output scope, steel column is become lifting elements with girder steel at the ground spelling, a hoisted in position;
Firm welding between d, steel column and the girder steel;
3. the precompressed of steel work support platform: prepressing materials adopts coke oven resistance wall and basement precast plate, and the design load according to 110% is carried out surcharge preloading, and squeeze time is 7 days, establishes observation point, observes every day 1 time;
4. the installation of each template scaffold:
The bracing frame of a, this two places template all adopts fastener type steel pipe scaffold, and the precompressed of steel work support platform begins to set up after finishing
Slab form and
The bracing frame of the template of cornicing; During scaffold building, weld a plurality of reinforcing bars at the center, the edge of a wing of steel work support platform time girder steel earlier;
B, bracing frame are set up according to the code requirement of fastener type steel pipe scaffold;
The bracing frame of Reinforced Concrete Double curved funnels template, hyperbola funnel template comprise hyperbola template and funnel girder template:
A, Reinforced Concrete Double template curve, main joist is fixed on the scaffold by fastener and supporting steel pipe, to bend in advance again and be pressed into the secondary joist of hyp reinforcing bar as inside and outside hopper walls wooden form, spacing according to 150mm is fixed on the main joist, main joist and secondary joist is fixed with split bolt according to the spacing of 500mm;
The below of b, funnel girder template is supported on steel pipe scaffold
On the floor, vertical rod in the scaffold is arranged and is horizontal spacing 470mm, longitudinal pitch 500mm, step pitch 1000mm, and the vertical rod bottom vertically is provided with channel-section steel, and rod end is provided with jackscrew, and the i iron that is provided with on the jackscrew is as the main joist of girder template, secondary joist then is arranged on the flitch of main joist top, and adjacent flitch spacing is 200mm;
When the concrete strength for the treatment of Reinforced Concrete Double curved funnels girder template reaches design strength 100%, can remove the bracing frame and the funnel girder beam bottom board plate of support shuttering, begin to set up
The bracing frame of slab form, this supports and adopts fastener type steel pipe scaffold, and sets up according to the code requirement of fastener type steel pipe scaffold;
5. the dismounting of scaffold and steel work support platform:
A, when the concrete strength of Reinforced Concrete Double template curve and funnel girder template reaches design strength 100%, remove whole scaffolds, and in time the concrete structure of high-altitude long-span checked, checked and accepted;
B, treat the exterior decoration acceptance(check) after, remove the steel work support platform comprehensively, according to after set up tear the orderly release of tearing open after setting up earlier, the and in time material that removes being cleared outside the appearance earlier open.
Compared with prior art, the job practices of this engineering is by well-designed to large span, high, heavy burden formwork bracing system, and effectively monitoring has obtained good effect, has especially started the beginning that the crack does not appear in domestic 34.045 meters span coal tower beams; Large span, high, the difficult problem of heavy load structure construction have been solved; Adapt to the developing direction of coking engineering projects to the coke oven that maximizes, fiddles with, it is as follows that it obtains effect:
1, the duration is short: the steel work support platform can be processed prefabricated outside the field, does not take the leading duration, does not take the construction plant, and the condition of interchange operation can be provided;
2, circulation material is economized: utilize the steel work support platform, convert high-supported formwork to the common templates support system, saved the input of a large amount of steel pipe scaffold materials, wherein shaped steel can reclaim repeated use;
3, safe and reliable: stressed clear and definite, the dependable performance of steel work support platform, and steel pipe scaffold is difficult to once set up put in place, has potential safety hazard, and existing high-supported formwork with work high above the ground converts the operating condition with reliable and secure protection to, improve safety factor, safe and reliable;
4, be convenient to quality control: engineering such as construction high-altitude long-span concrete structure and outer Decorating Project, equipment installation on the steel platform, the operating condition safe ready is convenient to check, examination, helps improving construction quality;
5, concrete structural strength height, good endurance: steel work support platform rigidity is big, good integrity, and beam can downwarp not produce the crack during construction, so the concrete structural strength height, good endurance.
Description of drawings
Fig. 1 is a formwork bracing system overall structure schematic diagram of the present invention.
Fig. 2 is a formwork bracing system layout plan of the present invention.
Fig. 3 is that A-A among Fig. 1 is to sectional view.
Fig. 4 is that B-B among Fig. 1 is to sectional view.
Fig. 5 is a hyperbola funnel formwork structural representation.
Fig. 6 is the C portion partial enlarged drawing among Fig. 5.
Wherein: support platform 1, the bracing frame 2 that cornices cornices 3,
Floor 4, hyperbola template 5, funnel girder template 6,
Floor 7,
Floor bracing frame 8, steel column 9, main girder steel 10, inferior girder steel 11, purlin 12, angle steel 13, channel-section steel 14, girder formwork-support 15, channel-section steel 16, jackscrew 17, i iron 18, flitch 19, funnel girder beam sill template 20, three word cards 21, secondary joist 22, split bolt 23, main joist 24, hopper walls wooden form 25.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Referring to accompanying drawing 1-6, in the present embodiment, this stamp charging coke oven coal tower large span, height prop up, the job practices of load cast board supporting structure, the braced structures of this template comprises the steel work support platform 1 that is used for support shuttering integral body, also comprise the bracing frame that is used to support each template, these bracing frames comprise and are used for supporting
Slab form 4,
Slab form 7,
Hyperbola template 5 in the template of cornicing 3, the hyperbola funnel template, the formwork-support of funnel girder template 6.
Wherein: the steel column 9 of steel work support platform 1 adopts H shaped steel H250 * 250 * 14 * 14, welds with anchor slab.L75 * 6 angle steel 13, gusset plate δ 8 are adopted in the support that steel column is 9.The girder steel of steel work support platform 1 comprises main girder steel 10, inferior girder steel 11, purlin 12, and main girder steel 10 adopts i iron I 32a, lateral arrangement; Inferior girder steel 11 adopts i iron I25a spacing 1250mm; Purlin 12 adopts i iron I10a@500 lateral arrangement.Steel work support platform 1 springing height is 1/1000 of a span.There are a large amount of pre-embedded bolts at coal tower spout of funnel place, and set bolt is spread δ 4 steel plates at the bottom of adopting beam.
Described job practices is carried out according to following steps:
1. the processing on steel work support platform 1 basis:
A, base treatment: will be as the backfill compaction in layers of substrate, the thickness≤250mm of layering, coefficient of consolidation 〉=0.96;
B, built-in fitting is handled: after base treatment is intact, building thickness on substrate is the C25 steel concrete of 250mm, do to deepen to handle at the steel column foot place, it is exactly to make dark 500mm that general intensification is handled, long 1000mm, the foundation pit of wide 800mm, press the plan-position of steel column in the design scheme of steel work support platform, measure the embedded part position, control the embedded part absolute altitude with level gauge during installation, the pre-buried anchor slab of making in advance is installed in foundation pit, this anchor slab is of a size of 600 * 800 * 16 (mm), the anchor slab top plug is welded with anchor fluke, and the anchor fluke of each anchor slab bottom is that 12 diameters are 22mm, the screw-thread steel of long 450mm;
C, health handle: conditioned time 〉=7d, treat that the intensity of steel concrete in the substrate reaches 75% o'clock of design strength, installs steel work support platform 1.
2. the making of steel work support platform 1 and installation:
A, according to the setting-out of steel work form bracing system working drawing, number the material, and check size and direction between the drawing one by one, tie point between each parts, connection dimension and connected mode are corresponding one by one with working drawing, and sawing is adopted in the blanking of H shaped steel, i iron, prevent distortion;
B, steel column 9 adopt unit vertically to lift by crane, and accomplish to turn round and hold up directly, should avoid in the lifting turning course with other mounted structure collisions, hoist cable should be reserved effective height, steel column 9 hold up the cat ladder of ascending a height should be hung on the steel column preposition before straight and colligation firm, lift by crane back temporary fixed, correction verticality in place, steel column is in place, and just can unclamp hoist cable after alignment axis, the fixation; Girder steel adopts 2 colligation levels liftings, must guarantee in the hoisting process that girder steel keeps level, when hanging many girder steels colligation firm, and install one by one, during installation, steel column all is fixed on the pre-buried anchor slab, guarantees the stability that steel column supports; Channel-section steel 14 is adopted in support between steel column and the girder steel, and the angle steel 13 of L75 * 6 is adopted in the support between the steel column, guarantees stability;
C, in the crane output scope, steel column is become lifting elements with girder steel at the ground spelling, as steel column and steel support, girder steel spelling etc., a hoisted in position;
Firm welding between d, steel column and each girder steel, the main weld two ends of joint must dispose run-on tab and end tab, and its material should be with identical by the weldering mother metal, and groove type should ban use of the material of other materials to serve as run-on tab and end tab with identical by welding line.
3. the precompressed of steel work support platform 1: prepressing materials adopts coke oven resistance wall and basement precast plate, and the design load according to 110% is carried out surcharge preloading, and squeeze time is 7 days, establishes observation point, observes every day 1 time.
4. the installation of each formwork-support:
The bracing frame of a, this two places template all adopts fastener type steel pipe scaffold, and 1 precompressed of steel work support platform begins to set up after finishing
Slab form bracing frame 8 reaches
Bracing frame 2 cornices.During scaffold building, on the edge of a wing center line of the inferior girder steel 11 of steel structure platform 1, according to vertical pole ' s span welding φ 25 reinforcing bars of setting up in the bracing frame, long 100mm, its effect is to prevent the vertical rod slippage, avoids the i iron eccentric force;
B, bracing frame are set up according to the fastener type steel pipe scaffold code requirement;
The bracing frame of Reinforced Concrete Double curved funnels template, hyperbola funnel template comprise hyperbola template 5 and funnel girder template 6:
A, Reinforced Concrete Double template curve 5 main joists 24 adopt steel pipe Φ 48 * 3.5, and main joist 24 is fixed on the girder formwork-support 15 by fastener and supporting steel pipe, its spacing 500mm; To bend in advance and be pressed into the secondary joist 22 of hyp reinforcing bar as inside and outside hopper walls template 25, reinforcing bar adopts screw-thread steel Φ 22 its spacing 150mm colligations on main joist 24; Split bolt 23 usefulness three word cards 21 are fixedly on the main joist 24, and it is that the round steel of 12mm is made that split bolt 21 adopts diameters;
The below of b, funnel girder template 6 is supported on the steel pipe scaffold tubes
On the floor, the specification of steel pipe is Φ 48 * 3.5 in this bracing frame 15, and the vertical rod in the scaffold tubes is arranged and is horizontal spacing 470mm, longitudinal pitch 500mm, and step pitch 1000mm, and the vertical rod bottom vertically is provided with channel-section steel 16, is used for diffusion pressure; Rod end is provided with jackscrew 17, and No. 10 the i iron 18 that is provided with on the jackscrew 17 is as the main joist of girder template, and secondary joist then is arranged on the flitch 19 of main joist top, and the specification of this flitch 19 is 50 * 100mm, and the spacing of adjacent flitch 19 is 200mm; Vertical rod is the steel pipe of vertical setting, must not overlap between each vertical rod, must calculate and cut size accurately according to the size of drawing, to guarantee the stability of scaffold.
When the concrete strength for the treatment of Reinforced Concrete Double curved funnels girder template 6 reaches design strength 100%, can remove the bracing frame and the funnel girder beam bottom board plate 20 of support shuttering, begin to set up
The bracing frame of slab form 7, this bracing frame adopts fastener type steel pipe scaffold, and it is set up according to the fastener type steel pipe scaffold code requirement.
5. the dismounting of bracing frame and steel work support platform:
A, when the concrete strength of Reinforced Concrete Double template curve and funnel girder template reaches design strength 100%, remove whole bracing frames, and in time the concrete structure of high-altitude long-span checked, checked and accepted;
B, treat the exterior decoration acceptance(check) after, remove the steel work support platform comprehensively, according to after set up tear the orderly release of tearing open after setting up earlier, the and in time material that removes being cleared outside the appearance earlier open.
On the steel work support platform, close purpose safety net and scaffold floor should be set do dual security protection, should have the special messenger to be responsible for the timely foreign material of clearing up on the platform, prevent that the high-altitude object from causing security incident.The periphery of steel work support platform also should set in advance safe protective railing.
Claims (1)
1. the job practices of a support structure of coal tower template for tamping type coke oven, it is characterized in that, the braced structures of this template comprises the steel work support platform that is used for support shuttering integral body, also comprises the bracing frame that is used to support each template, and described job practices is carried out according to following steps:
1. the processing on steel work support platform basis:
A, base treatment: will be as the backfill compaction in layers of substrate, the thickness≤250mm of each layer, coefficient of consolidation 〉=0.96;
B, built-in fitting are handled: after base treatment was intact, building thickness was the thick steel concrete of 250mm, did at the steel column foot place to deepen to handle, and unwrapping wire is measured in the position of pressing steel column in the steel work Support Platform Design scheme, and the pre-buried anchor slab of making in advance is installed;
C, health handle: conditioned time 〉=7d, treat that the intensity of steel concrete in the substrate reaches 75% o'clock of design strength, installs the steel work support platform;
2. the making of steel work support platform and installation:
A, according to the setting-out of steel work form bracing system working drawing, number material, and check size and direction between the drawing one by one, sawing is adopted in the blanking of H shaped steel, i iron;
B, steel column adopt unit vertically to lift by crane, and girder steel adopts 2 colligation level liftings, and steel column all is fixed on the pre-buried anchor slab;
C, in the crane output scope, steel column is become lifting elements with girder steel at the ground spelling, a hoisted in position;
Firm welding between d, steel column and the girder steel;
3. the precompressed of steel work support platform: prepressing materials adopts coke oven resistance wall and basement precast plate, and the design load according to 110% is carried out surcharge preloading, and squeeze time is 7 days, establishes observation point, observes every day 1 time;
4. the installation of each template scaffold:
The bracing frame of a, this two places template all adopts fastener type steel pipe scaffold, and the precompressed of steel work support platform begins to set up after finishing
The bracing frame of slab form and
The bracing frame of the template of cornicing; During scaffold building, weld a plurality of reinforcing bars at the center, the edge of a wing of steel work support platform time girder steel earlier;
B, bracing frame are set up according to the code requirement of fastener type steel pipe scaffold;
The bracing frame of Reinforced Concrete Double curved funnels template, hyperbola funnel template comprise hyperbola template and funnel girder template:
A, Reinforced Concrete Double template curve, main joist is fixed on the scaffold by fastener and supporting steel pipe, to bend in advance again and be pressed into the secondary joist of hyp reinforcing bar as inside and outside hopper walls wooden form, spacing according to 150mm is fixed on the main joist, main joist and secondary joist is fixed with split bolt according to the spacing of 500mm;
The below of b, funnel girder template is supported on steel pipe scaffold
On the floor, vertical rod in the scaffold is arranged and is horizontal spacing 470mm, longitudinal pitch 500mm, step pitch 1000mm, and the vertical rod bottom vertically is provided with channel-section steel, and rod end is provided with jackscrew, and the i iron that is provided with on the jackscrew is as the main joist of girder template, secondary joist then is arranged on the flitch of main joist top, and adjacent flitch spacing is 200mm;
When the concrete strength for the treatment of reinforced concrete soil hopper girder template reaches design strength 100%, can remove the bracing frame and the funnel girder beam bottom board plate of support shuttering, begin to set up
The bracing frame of slab form, this supports and adopts fastener type steel pipe scaffold, and sets up according to the code requirement of fastener type steel pipe scaffold;
5. the dismounting of scaffold and steel work support platform:
A, when the concrete strength of Reinforced Concrete Double template curve and funnel girder template reaches design strength 100%, remove whole scaffolds, and in time the concrete structure of high-altitude long-span checked, checked and accepted;
B, treat the exterior decoration acceptance(check) after, remove the steel work support platform comprehensively, according to after set up tear the orderly release of tearing open after setting up earlier, the and in time material that removes being cleared outside the appearance earlier open.
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| CN201010224364XA CN101886466B (en) | 2010-07-09 | 2010-07-09 | Construction method for support structure of coal tower template for tamping type coke oven |
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