CN104929360A - Template system and cast-in-situ concrete floor - Google Patents
Template system and cast-in-situ concrete floor Download PDFInfo
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- CN104929360A CN104929360A CN201510364373.1A CN201510364373A CN104929360A CN 104929360 A CN104929360 A CN 104929360A CN 201510364373 A CN201510364373 A CN 201510364373A CN 104929360 A CN104929360 A CN 104929360A
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Abstract
The invention discloses a template system used for a cast-in-situ concrete floor. The template system comprises a template and multiple parallel joists. The end head of at least one joist is provided with a cantilever beam remained in the floor. The cantilever beams are steel components and protrude from the end heads of the joists, the protruded parts of the cantilever beams serve as lapping portions, and the other parts of the cantilever beams are laminated on the top surfaces of the joists and are in detachable connection with the joists through fasteners. The template system can be rapidly installed, has no vertical support, or only has a few of supports. The invention also discloses the cast-in-situ concrete floor, the multiple cantilever beams are arranged at intervals at floor supporting portions, the cantilever beams are the steel components, parts of the cantilever beams are arranged on steel beams or precast concrete beams or precast reinforced concrete shear walls which supporting the floor, and downwardly-through screw holes d and nuts are arranged near the external of a supporting seat. The cast-in-situ concrete floor is convenient to construct and is low in comprehensive cost.
Description
Technical field
The invention belongs to technical field of buildings, relate to template system, the invention still further relates to cast-in-situ concrete floor.
Background technology
The template of cast-in-situ concrete floor generally adopts full hall scaffold to support, and its technical maturity, reliability is high, but operation is numerous and diverse, and materials are many, and cost is high.
One of way improved uses Prefabricated stacking floor, replaces template.But Prefabricated stacking floor weight is comparatively large, and cost is high, and globality is slightly poor.Meanwhile, when being bearing in prefabricated reinforced concrete shear wall, shelving length is subject to the restriction of its exposed steel bar, interacts with prefabricated reinforced concrete shear wall.
Two of Improving ways uses horizontal support template system, by the large joist rest of template load on precast beam or wall, cancels or decrease vertical supporting.Especially apply more in steel work, such as Authorization Notice No. CN202577955 U, the day for announcing: 2012.12.5, denomination of invention is the Chinese patent of " in-situ reinforced concrete slab is without support shuttering system ", its scheme is: this template system comprises girder steel and the bed die template set gradually, the first pressure pin and the second pressure pin from top to bottom, wherein, described girder steel comprises web and is positioned at the edge of a wing of web end, described web is arranged pressure pin connector, the two ends of described second pressure pin are connected with described girder steel by described pressure pin connector; Described first pressure pin is arranged on described second pressure pin; Described bed die template-setup on described first pressure pin, and presses closer on the lower surface on the edge of a wing of described girder steel.And for example Chinese patent " the reinforced concrete floor construction hanging erecting by overhang of lower suspention " (Authorization Notice No. CN203755677 U, the day for announcing: 2014.8.6), its scheme is: arrange U-shaped that hangs in steel structure girder bottom, U-shaped bottom is fixed with square tube, crossbeam is installed in square tube, and the length direction along crossbeam is evenly provided with column, and column upper end is provided with keel, keel upper end is provided with template, and template holds out against steel structure girder.Such scheme eliminates profiled sheet or full hall scaffold, time saving and energy saving, reduce cost, but termination braced structures is complicated, and needs to install in the air one by one, and dismounting is still more loaded down with trivial details.
In addition, when cast-in-situ concrete floor span is larger, solid floor exists from the problem such as great, concrete amount is many, and conventional ribbed slab floor replaces.Can use the technical scheme such as non-dismantling formwork or filling block in ribbed slab floor, common construction method, need the operations such as on-the-spot aerial installation, drawback is many.
Summary of the invention
The object of the present invention is to provide template system, this template system is quick for installation, without vertical supporting or few support;
Another object of the present invention is to provide cast-in-situ concrete floor, and the construction of this cast-in-situ concrete floor is convenient, cost is low.
Template system of the present invention, the technical scheme adopted is, for cast in situ concrete floor, comprise template and many joists be arranged in parallel, have at least a joist termination to be provided with the outrigger be retained in floor, outrigger is steel part, outrigger stretches out joist termination, extension is as the section of setting up, and remainder is laminated on joist end face, is removably connected by securing member with joist.Like this, transmit all or part of working load by outrigger, realize horizontal support.
Feature of the present invention is also,
Outrigger main cross section is U-shaped, L-type, C type, Z-type or I shape, or outrigger is quarter bend or truss or lath, outrigger is provided with lower logical screw d or nut, the through hole that bolt is preset through joist termination, screw with the screw d on joist end face or nut, joist termination is also provided with reinforcing rib or reinforcement.
Joist is scalable beam, is made up of standard knot and telescopic section, standard knot and telescopic section portions telescope, and intussusception is arranged with multiple pairing pin-and-hole, interspersed bearing pin or bolt in the pin-and-hole of coincidence.
Joist is truss-like joist, and telescopic section end and standard knot lower edge end are provided with hinged detachable web member.
At least be provided with one to exempt to seal off limit.
The section of the setting up major part of outrigger is shelved on girder steel or Prefabricated Concrete beam or prefabricated reinforced concrete shear wall; No longer establish the vertical intermediate supports of other vertical supporting or Jin She 1-2 road.
Joist is also arranged time stupefied, secondary stupefied two ends are set up on joist, secondaryly stupefiedly above completely spread removable template.
Template system is ribbed slab floor template system, template comprises non-dismantling formwork, non-dismantling formwork is specially light concrete hollow lath or light-duty building block or other filling block, and the sidewall of light concrete hollow lath or light-duty building block or other filling block and its joist end face of rest form girt strip Cast-in-place concrete die cavity.
Joist end face is also provided with keeper, keeper is provided with reinforcing bar fixed part and limits the limiting component of light concrete hollow lath or light-duty building block or other filling block, the leg of keeper or bottom surface of support saddle are provided with the lower logical screw a or screw b or hole clipping that fix himself, and securing member is detachably fixed by aperture that joist is preset and the lower logical screw a of keeper or screw b or hole clipping.
Template system at least comprises the modular unit of an integral hoisting, and modular unit comprises multiple joist fixed by two or more cross-arm or connecting rod, the edge of joist top edge rest light concrete hollow lath or light-duty building block or other filling block.
Modular unit comprises more than three joists, and only outside two, the two ends of joist arrange outrigger.
Cast-in-situ concrete floor of the present invention, the technical scheme adopted is, arranges multiple outrigger at floor supporting place interval, and outrigger is steel part, parts rest, on the supporting girder steel of floor or Prefabricated Concrete beam or prefabricated reinforced concrete shear wall, is provided with lower logical screw d or nut near bearing is outer.
Feature of the present invention is also,
Cast-in-situ concrete floor is ribbed slab floor, ribbed slab floor comprises the dark beam of close rib and panel and light concrete hollow lath or light-duty building block or other filling block, the dark beam of close rib is by indulging girt strip and gate beam is formed, or be only made up of vertical girt strip, multiple light concrete hollow laths or light-duty building block or other filling block are spaced, and between its plate, plate top fluid concrete forms the dark beam of close rib and panel.
Also containing keeper in the dark beam of close rib, keeper is provided with reinforcing bar fixed part and limits the limiting component of light concrete hollow lath or light-duty building block or other filling block, on the bearing of keeper or the bottom surface of leg, also be provided with the lower logical screw a or screw b or hole clipping that fix self, the bottom of the dark beam of close rib is indulged on the reinforcing bar fixed part that muscle is fixed on, and limiting component limits interval or the position of light concrete hollow lath or light-duty building block or other filling block.
Floor supporting place is also provided with exempts to seal off limit.
The invention has the beneficial effects as follows:
1, the setting of outrigger, can make joist lay above beam or wall easily, can realize the horizontal support of template, not establish full hall scaffold, labor and material saving, and template bottom construction space is unobstructed.
2, energy pre-assembled large form, carries out integral hoisting, reduces aerial work, raises the efficiency and safety.
3, light concrete hollow lath or light-duty building block are as non-dismantling formwork, and derive from materials for wall, lightweight, efficiency of construction is high, and cost is low, and industrialization system is ripe, has widened the range of application of relevant walling.
4, keeper is set, ensure that girt strip size and reinforcement location accurately and reliably.
5, the flexibility of template system particularly joist is strong, can reuse often, easy accessibility.
6, can see bottom girt strip after form removal, be convenient to check girt strip quality.
7, cast-in-situ concrete floor especially ribbed slab floor, adapts with template system of the present invention, and the outrigger, keeper etc. of indwelling have no adverse effect to floor performance, and keeper can also as suspension connecting piece.Floor fire prevention sound insulation is lightweight, and accurately, floor slab bottoms is smooth, good combination property, and cost is low for girt strip reinforcement location and size.
Accompanying drawing explanation
Fig. 1 is joist front view (band outrigger);
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is grooved joist schematic diagram (profile);
Fig. 4 is scalable truss-like joist structure schematic diagram;
Fig. 5 is template system embodiment one front view;
Fig. 6 is the B-B sectional view of Fig. 5;
Fig. 7 is that template system implements a top view;
Fig. 8 is template system embodiment two front view;
Fig. 9 is template system embodiment two top view;
Figure 10 is template system embodiment three top view;
Figure 11 is the C-C sectional view of Figure 10;
Figure 12 is the first locating part front view;
Figure 13 is the D direction view of Figure 12;
Figure 14 is the second locating part front view;
Figure 15 is the E direction view of Figure 14;
Figure 16 is the third locating part structural representation;
Figure 17 is the ribbed slab floor plan view comprising light concrete hollow lath;
Figure 18 is the F-F profile (half-twist) of Figure 17;
Figure 19 is the ribbed slab floor plan view comprising light-duty building block;
Figure 20 is the G-G sectional view of Figure 19.
In figure, 1. joist, 1-1. through hole, 1-2. horizontal stripe, 1-3. flanging, 1-4. aperture a, 1-5. stiffener, 1-6. first reinforcing rib, 1-7. second reinforcing rib, 1-8. backing plate, 1-9. screw, 1-10. aperture, 1A. standard knot, 1B. telescopic section, 1B1. pin-and-hole, 1C. web member, 1C1. screw thread, 1AB1. bearing pin, 2. outrigger, 2-1. nut, 2-2. through hole, 3. bolt, 4. cross-arm, 4-1. securing member, 4-2. hole for hoist, 5. girder steel, 5A. Prefabricated Concrete beam, 5B. prefabricated reinforced concrete shear wall, 5B1. vertical reinforcement, 5B2. pre-embedded steel slab, 6. template, 7. time stupefied, 8. cross rib bed die, 9. vertical girt strip, 9 '. gate beam, 10. exempt to seal off limit, 11. keepers, 12. light concrete hollow laths, 12-1. core bore, 12-2. plug, 12-3. aperture b, 12 '. light-duty building block, 13. gear legs, 14. screw a, 14 '. screw b, 15. horizontal holders, 16. elbows, 16 '. clamping position, vertical muscle bottom 17., 18. legs, 19. fasten hole, 20. tie up silk, 21. collars, 22. bearings, 23. screw c, 24. stoppers, 25. finish coats, 26. stirrups, 27. handling reinforcements, 28. panels, 29. steel mesh reinforcements, 30. screw d, L. the section of setting up, P. solid floor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Template system embodiment 1, as Fig. 1-7, comprises joist 1, template 6, joist 1 shown in Fig. 1 and Fig. 2, be shape for hat girder steel, its top is provided with through hole 1-1, the competent structure that adds of termination comprises stiffener 1-5, the first reinforcing rib 1-6, the second reinforcing rib 1-7, and bottom interval is provided with horizontal stripe 1-2; Flanging 1-3 is arranged at shape for hat girder steel bottom, and flanging 1-3 is provided with aperture a1-4.Outrigger 2 is U-shaped steel parts, cut sth. askew or chamfering in stud two ends, centre is provided with perforate, perforate is furnished with nut 2-1, bolt 3, through through hole 1-1, screws with nut 2-1, by fastening to joist 1 and outrigger 2, bolt 3 can be dismantled from joist 1 bottom, and the bonding surface not spillage of joist 1 and outrigger 2, bonding surface also can arrange pad.Outrigger 2 stretches out joist 1 termination, and the section of setting up L major part is shelved on girder steel 5 edge of a wing end face.Joist 1 length is slightly less than the clear distance (general short 1-5cm) of two supporting girder steels 5.
As shown in Fig. 5, Fig. 6 and Fig. 7, two joist 1 bottoms are fixed by securing member 4-1 and two cross-arm 4, and cross-arm 4 termination is also provided with hole for hoist 4-2; Multiple times stupefied 7 intervals are arranged, and rest is on flanging 1-3 or horizontal stripe 1-2, and completely spread removable template 6 on secondary stupefied 7, template 6 can be veneer, plastic plate or steel form etc., this template system is also provided with and exempts to seal off limit 10.
Joist 1 also can be cross section grooved girder steel as shown in Figure 3, which is provided with backing plate 1-8, and backing plate 1-8 is fixed by screw 1-9 and joist 1, and grooved joist 1 bottom is provided with multiple horizontal stripe 1-2.The structure of joist 1 can also have different forms, as multi-form in L-type, Z-type, C type, quarter bend formula, strip type, truss etc.
When span or load larger time, truss-like joist can be used, as shown in Figure 4, also possesses stretching structure, be provided with pin-and-hole with reference to profile (amplification) 1AB, standard knot 1A termination, telescopic section 1B is provided with multiple respective pin hole 1B1, bearing pin 1AB1 is provided with in the pin-and-hole overlapped, use different pin-and-hole, i.e. adjustable length on telescopic section 1B, similarly, standard knot 1A also can be arranged the pin-and-hole of multiple different spacing, increase flexible adjustment; Also can use bolton, replace pinned connection.The lower edge end of telescopic section 1B end and standard knot 1A is provided with the pin-and-hole matched with web member 1C two ends, for being articulated and connected, is provided with the adjustment section of threaded 1C1 in the middle of web member 1C, regulates length by rotating.
For raising the efficiency and safety, prepackage on the ground of should trying one's best is made into modular unit, as Fig. 5-7, can regard as the modular unit of an energy integral hoisting, larger template system, needs many group modular unit spelling groups.Certainly, as restricted, also can assemble one by one in the air at the scene, now also can replace cross-arm 4 with connecting rod, or drawknot structure is arranged on time stupefied on, more convenient.The present embodiment is comparatively applicable to solid floor.
Template system embodiment 2, as shown in Figure 8, Figure 9, is mainly used in ribbed slab floor, adopts light concrete hollow lath 12 to replace removable template 6 as non-dismantling formwork, and light concrete hollow lath 12 both sides are set up at joist 1 edge, and the termination of joist 1 arranges the outrigger 2 of two L-types.Joist 1 is also fixed with keeper 11, and for limiting vertical muscle 17 bottom light concrete hollow lath 12 position and fixing girt strip, multiple joist 1 is fixed by securing member 4-1 with at least two cross-arms 4.The outrigger 2 of two L-types is arranged on the termination of joist 1, and outrigger 2 is provided with nut 2-1.This structure, can pre-install and be made into modular unit, can be also stably be placed on girder steel 5 by single joist 1, then install other parts.Cross-arm 4 also can replace with connecting rod.
Template system embodiment 3, as shown in Figure 10, Figure 11, template system comprises a modular unit, this modular unit contains three joists 1, multiple light-duty building block 12 ', and keeper 11 limits light-duty building block 12 ' position and solid bottom indulges muscle 17, and keeper 11 self is fixed on joist 1 end face by securing member, in addition, also be provided with and set up cross rib bed die 8 on joist 1, this modular unit is only provided with 4 outriggers 2 in joist 1 termination in outside, and this template system can form two-way ribbed slab.
As shown in figs. 12-16, show three kinds of keepers that can mutually replace 11, the first keeper, as shown in Figure 12 and Figure 13, horizontal holder 15 two ends are respectively equipped with gear leg 13, and gear leg 13 is limiting components, keeping out light concrete hollow lath 12 or light-duty building block 12 ' sidewall by lateral surface comes spacing, gear leg 13 is also the bearing of keeper, has screw a14, be used for fixing self bottom it.Elbow 16 is fixing reinforcing steel bar part, and bottom girt strip, vertical muscle 17 is folded into clamping position 16 ' by elbow 16, and buckle is fixed.
The second keeper, as Figure 14 and Figure 15, horizontal holder 15 two ends are provided with gear leg 13, and bottom is provided with leg 18, it has screw b14 ', fastens in hole 19 to be provided with and ties up silk 20, vertical muscle 17 bottom colligation.
The third keeper, as shown in figure 16, divide into bearing 22 in the middle of horizontal holder 15, bearing 22 bottom surface is provided with screw c23, and in horizontal holder 15, two ends are arranged with two collars 21, and horizontal holder 15 two ends are also provided with stopper 24.
For light-duty building block 12 ' or other filling block, also can arrange elongated blend stop and come spacing on multiple keeper, efficiency is higher.
Use above-mentioned template system can build dissimilar floor.Is solid floor as shown in P in Fig. 6.Joist 1, removable template 6 can be reused.
Another kind is Cast-in-place concrete ribbed slab floor, as shown in figs. 17-18, comprise vertical girt strip 9, gate beam 9 ' and panel 28 and light concrete hollow lath 12, between the plate of multiple light concrete hollow lath 12, plate top fluid concrete forms vertical girt strip 9 respectively, gate beam 9 ' and panel 28, containing steel mesh reinforcement 29 in panel 28, light concrete hollow lath 12 is gypsum hollow lath or cement lightweight aggregate hollow lath, centre is provided with multiple parallel core bore 12-1, core bore 12-1 one end is provided with plug 12-2, the other end is reduced into aperture b12-3, outrigger 2 is contained in vertical girt strip 9 termination, outrigger 2 termination is shelved on Prefabricated Concrete beam 5A, the through hole 2-2 of outrigger 2 joins nut 2-1.Vertical girt strip 9, gate beam 9 ', panel 28 and light concrete hollow lath 12 consolidation bond or are overlapped into entirety.
Use the light-duty building block of polylith 12 ' also can spell and be extruded into the similar length and width size of light concrete hollow lath 12, effect is substantially identical, the normally unidirectional ribbed slab floor of this kind of floor.
Another Cast-in-place concrete ribbed slab floor as illustrated in figures 19 and 20, is two-way ribs structure.Light-duty building block 12 ' interval is arranged, betwixt every with top concreting, form the vertical girt strip 9 of bi-directional configuration respectively, gate beam 9 ' and panel 28, in vertical girt strip 9 and gate beam 9 ', stirrup 26 and handling reinforcement 27 are set, also be provided with keeper 11, limit the spacing of light-duty building block 12 ' and solid bottom indulges muscle 17, outrigger 2 parts rest is on the pre-embedded steel slab 5B2 of prefabricated reinforced concrete shear wall 5B, dry patching mortar in the screw d30 of outrigger 2, through vertical reinforcement 5B1 is established in prefabricated reinforced concrete shear wall 5B, underfloor bottom surface is provided with floated coat or finish coat 25, the lower logical screw a14 of part keeper 11 does not close, as suspension connecting piece.Light-duty building block 12 ' also can replace with other filling block.
Claims (15)
1. template system, for cast in situ concrete floor, comprise template and many joists be arranged in parallel (1), it is characterized in that: have at least joist (1) termination to be provided with the outrigger (2) be retained in floor, described outrigger (2) is steel part, outrigger (2) stretches out joist (1) termination, extension is as the section of setting up (L), remainder is laminated on joist (1) end face, is removably connected by securing member with joist (1).
2. template system as claimed in claim 1, it is characterized in that: described outrigger (2) main cross section is U-shaped, L-type, C type, Z-type or I shape, or outrigger (2) is quarter bend or truss or lath, outrigger (2) is provided with lower logical screw d (30) or nut (2-1), the through hole (1-1) that bolt (3) is preset through joist (1) termination, screws with the screw d (30) on joist (1) end face or nut (2-1); Joist (1) termination is also provided with reinforcing rib or reinforcement.
3. template system as claimed in claim 1, it is characterized in that: described joist (1) is scalable beam, be made up of standard knot (1A) and telescopic section (1B), standard knot (1A) and telescopic section (1B) portions telescope, intussusception is arranged with multiple pairing pin-and-hole, interspersed bearing pin (1AB1) or bolt in the pin-and-hole of coincidence.
4. template system as claimed in claim 3, it is characterized in that: described joist (1) is truss-like joist, telescopic section (1B) end and standard knot (1A) lower edge end are provided with hinged detachable web member (1C).
5. template system as claimed in claim 1, is characterized in that: be at least provided with one and exempt to seal off limit (10).
6. template system as claimed in claim 1, is characterized in that: the section of setting up (L) major part of described outrigger (2) is shelved on girder steel (5) or Prefabricated Concrete beam (5A) or prefabricated reinforced concrete shear wall (5B); No longer establish the vertical intermediate supports of other vertical supporting or Jin She 1-2 road.
7. the template system as described in as arbitrary in claim 1-6, it is characterized in that: described joist (1) is also arranged time stupefied (7), secondary stupefied (7) two ends are set up on joist (1), the template (6) that secondary stupefied (7) Shang Manpu is removable.
8. the template system as described in as arbitrary in claim 1-6, it is characterized in that: described template system is ribbed slab floor template system, described template comprises non-dismantling formwork, described non-dismantling formwork is specially light concrete hollow lath (12) or light-duty building block (12 ') or other filling block, and sidewall and its joist of rest (1) end face of light concrete hollow lath (12) or light-duty building block (12 ') or other filling block form girt strip Cast-in-place concrete die cavity.
9. template system as claimed in claim 8, it is characterized in that: described joist (1) end face is also provided with keeper (11), keeper (11) is provided with reinforcing bar fixed part and limits the limiting component of light concrete hollow lath (12) or light-duty building block (12 ') or other filling block, the leg of keeper (11) or bottom surface of support saddle are provided with the lower logical screw a (14) or screw b (14 ') or hole clipping of fixing himself, securing member is detachably fixed by the lower logical screw a (14) of the upper aperture (1-10) preset of joist (1) and keeper (11) or screw b (14 ') or hole clipping.
10. template system as claimed in claim 9; it is characterized in that: described template system at least comprises the modular unit of an integral hoisting; modular unit comprises multiple joist (1) fixed by two or more cross-arm or connecting rod, the edge of joist (1) top edge rest light concrete hollow lath (12) or light-duty building block (12 ') or other filling block.
11. template systems as claimed in claim 10, is characterized in that: described modular unit comprises more than three joists (1), and only outside two, the two ends of joist (1) arrange outrigger (2).
12. cast-in-situ concrete floor, it is characterized in that: at floor supporting place interval, multiple outrigger (2) is set, described outrigger (2) is steel part, parts rest, on the supporting girder steel (5) of floor or Prefabricated Concrete beam (5A) or prefabricated reinforced concrete shear wall (5B), is provided with lower logical screw d (30) or nut (2-1) near bearing is outer.
13. cast-in-situ concrete floor as claimed in claim 12, it is characterized in that: described cast-in-situ concrete floor is ribbed slab floor, described ribbed slab floor comprises the dark beam of close rib and panel (28) and light concrete hollow lath (12) or light-duty building block (12 ') or other filling block, the dark beam of close rib is by indulging girt strip (9) and gate beam (9 ') is formed, or be only made up of vertical girt strip (9), multiple light concrete hollow lath (12) or light-duty building block (12 ') or other filling block are spaced, between its plate, plate top fluid concrete forms the dark beam of close rib and panel (28).
14. cast-in-situ concrete floor as claimed in claim 13, it is characterized in that: also containing keeper (11) in the described dark beam of close rib, keeper (11) is provided with reinforcing bar fixed part and limits the limiting component of light concrete hollow lath (12) or light-duty building block (12 ') or other filling block, on the bearing of keeper (11) or the bottom surface of leg, also be provided with the lower logical screw a (14) or screw b (14 ') or hole clipping of fixing self, the bottom of the dark beam of close rib is indulged muscle (17) and is fixed on described reinforcing bar fixed part, described limiting component limits interval or the position of light concrete hollow lath (12) or light-duty building block (12 ') or other filling block.
15. cast-in-situ concrete floor as claimed in claim 12, is characterized in that: supporting place of described floor is also provided with exempts to seal off limit (10).
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| CN108130969A (en) * | 2018-02-14 | 2018-06-08 | 上海欧本钢结构有限公司 | A kind of dismountable floor plates system and its construction method |
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| CN111779169B (en) * | 2020-06-24 | 2022-01-18 | 天津洪晟基业建材有限公司 | Support-free assembled formwork device for ribbed floor and construction method |
| CN111691593B (en) * | 2020-06-24 | 2022-01-18 | 天津洪晟基业建材有限公司 | Dense rib support-free system and construction method thereof |
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