CN102619300A - Large-span high-load prestressing force groove-shaped composite plate used as top plate of anti-aircraft basement - Google Patents
Large-span high-load prestressing force groove-shaped composite plate used as top plate of anti-aircraft basement Download PDFInfo
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- CN102619300A CN102619300A CN2011100351998A CN201110035199A CN102619300A CN 102619300 A CN102619300 A CN 102619300A CN 2011100351998 A CN2011100351998 A CN 2011100351998A CN 201110035199 A CN201110035199 A CN 201110035199A CN 102619300 A CN102619300 A CN 102619300A
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Abstract
The invention discloses a large-span prestressing force groove-shaped composite plate used as a top plate of an anti-aircraft basement of 6 grades and lower than 6 grades. The composite plate is characterized in that a groove-shaped composite plate with a large span, a high load, a narrow board width and a low rib height forms a functional member together with an upper composite layer. Due to the adoption of an elastic-plastic deformation resilience characterization coefficient of a prestressing force plate, the resistance of the member under the action of a short-term effect of a nuclear explosion shock wave is improved. Therefore, materials are substantially saved, and the floor height is reduced. A groove-shaped large load meets the using requirements of an underground garage; parking spaces are saved in a large span; due to the adoption of a groove-shaped narrow board, the manufacturing cost and the floor height can be reduced; and the composite plate has an appropriate rib height and can meet load bearing requirements and the requirement of forming an air channel on a rib, the floor height is not increased, and a groove-shaped horizontal air channel is easy to connect. When the composite plate is used for the top plate of the underground garage, a construction period can be accelerated, the floor height can be reduced, the manufacturing cost can be reduced, a column grid can be saved, the parking spaces can be increased, and the grade of the underground garage can be improved.
Description
Technical field
The invention belongs to building material field, relate to a kind of reinforced concrete sandwich bearing carrier, particularly relate to a kind of be used as 6 grades and following air's top board or above earthing is arranged, run the big load prestressing force of the large span flute profile superimposed sheet on the basement plate top of fire fighting truck.
Background technology
The large span prestressed concrete trough slab is the prefabricated reinforced concrete bearing carrier that beam slab combines, and is made up of roomy panel and two narrow and high ribs.Its panel is horizontal load-carrying members, is again the pressure zone of vertical load-bearing rib.So the large span prestressed concrete trough slab has good structural mechanical property, clear and definite power transmission level, succinct geometry is a kind of large span, big load, big area coverage and both economical bearing carrier of can be made into.
But, in 6 grades and following air and garage construction, all be 8 meters * 8 meters left and right sides post nets or 8 meters * 6 meters post nets at present, not only cost is high, long construction period, and space availability ratio is extremely low, and parking stall quantity is less, and is not attractive in appearance again.
Summary of the invention
The objective of the invention is to above problem to present 6 grades and following air, garage; Thereby provide a kind of big load prestressing force of large span flute profile superimposed sheet to simplify building structure as underground garage plate top; Save the duration, save cost, save the soil; Particularly save excavation area or save the parking stall, improve underground garage and 6 grades and following air's class.
Technical scheme of the present invention is following:
One: make trough slab master muscle with the low relaxed prestress high tensile reinforcement, utilize the elastic-plastic deformation restoring force characteristic coefficient of prestressed slab, improve the drag of member under the effect of nuclear blast wave short-term effect
,Form with common net sheet, riblet, embedded part reinforcing bar and concrete for making.
Explanation about people's air defense prestressed concrete plate elastic-plastic deformation restoring force characteristic coefficient
(1) universal of the deformation of member and recovery thereof
1. any material members is when after constraints lower stress or effect, all deforming.In regime of elastic deformation, the system distortion recovers after applying power or acting on elimination; In elastic-plastic phase, after applying power or acting on elimination, the recovery extent of its distortion is different with the different in kind of material structure.The main distinction is several examples below lifting:
(1) low ductility or fragile material will rupture or lose efficacy in the early stage in this stage, and not only distortion is difficult to recovery, and forever lost bearing capacity and destroy.This also is the main cause that relevant specification (like population standard, earthquake resistant code) is forbidden this type material.
(2) non-prestressed concrete member, because reinforcing bar and concrete working mechanism and design principle in the member, legal this member is in and does not have the performance that distortion recovers after elastoplasticity becomes.
(3) with regard to prestressed concrete member, its elastic-plastic deformation is recovered the property insisted on and is also differed bigger with material formation difference:
1. the early stage prestressed concrete member of China; Because of adopting low strong reinforcing bar and concrete material; The span that has not only limited member is (like early stage prestressed large span of slab about 6m; The double T plate is about 9m) distortion (containing crack resistance) the control difficult problem brought of increase, the problem on the design concept is also arranged.
2. China recent years is owing to after introducing the large-span prestressed test of carrying out behind the high strength low relaxed prestress reinforcing bar and conclusion research, just given the span that this member not only has to be needed, and had good deformation property.This is the relatively more consistent ground zero of praising the high ductile performance member of usefulness of present engineering circle.This is engineering circle to mention ductility, refers to the basic principle of conceptual Design of Earthquake Resistance especially.It is the specific character that structure or member absorb or release energy with the mode of being out of shape under power or power effect, and ductility factor then is one of sign of weighing its deformability.
(2) prestressing force double T plate is the member of high ductility and distortion restoring force characteristic
1, according to a large amount of experimental studies of China, the design principles of this class A of geometric unitA is successively brought the relevant specification of China into.Like " Code for design of concrete structures " GBJ10-89, GB50010-2002 and " Standard for quality inspection and asswssment of precast concrete members " GBJ321-90, GB50204-2002, and zone, provincial standard and national standard design.
1. the source of prestressed concrete double T plate elastic-plastic deformation restoring force coefficient
(1) test shows, after the rise-span ratio of member was greater than 15, the destruction of member mainly by destruction marking 1 control of regulation and stipulation, promptly received anti-district main muscle big 1.5mm of place's maximum crack width or amount of deflection greater than span length's 1/50, and is mostly the latter.Like GBJ321-90 regulation [Yu] is 1.45, and it is 1.35 that GB50204-2002 is adjusted into [Yu].It is 1.45 times or 1.35 times that the supporting capacity of deformation of member resistance reaches standard value at least.Test is found simultaneously; After unloading occurring under the afore mentioned rules failure criterion; Damaged component still has good recovery distortion; The performance that comprises closing up of cracks, this has explained that reinforcing bar and concrete in this member have extraordinary integral working, can not occur promptly that preparatory breaking of muscle and tendon splits, in advance the muscle anchoring was lost efficacy or the destruction situation.And based on the check of building member has also been proved this problem fully.Only be described below at this with several member assays in past, as representative:
1. DT30B-1 double T plate, C50,14 ∮ J, 15.24 steel strand, bearing capacity check design load is 7.97KN/m
2, the maximum load value is 12.12KN/m
2, the bearing capacity test coefficient is up to 1.52, and crack resistance is 1.2, maximum load (12.12KN/m
2) time crack width be 0.8mm, be loaded on 12.12KN/m
2Hold the check mark 1 that the ultimate limit states of standard setting does not appear in lotus, stop to load after the interested party consults, promptly press to cause destruction by code requirement.Performance after this component test and the off-load becomes a focus at that time.
2. after having accomplished distant 2006G403, carried out the check DT15 and the DT24 of two members, it destroys and characterizes the sign 1 that is the GB50204 regulation, like DT24, and bearing capacity test coefficient [Yu] >=1.35, crack width is 0.9mm, less than 1.5mm.In addition to adopting other unit of present technique, all meet the check mark of afore mentioned rules like the check structure of Jin Chao company double T plate, Dalian member company double T plate, the big wing member in Xuzhou company plate.Since this member designs method and quality control to improve constantly its quality level more stable.
(2) the elastic-plastic deformation restoring force characteristic coefficient of the complete this plate capable of using of prestressing force people's air defense plate, the drag of raising member also is the breakthrough or progressive of this people's air defense plate at this design field.
The people's air defense member several seconds under the nuclear blast wave effect or tens of second during of short duration scope, existing pressure ripple has the suction ripple again, and this deformation of members ability than
Non-Nuclear blast is that deformability (distortion, absorption energy) and the distortion restorability under static(al) loads is far better.Its destruction mark that occurs in slow test levy into " long-term effect " for more unfavorable, and under the nuclear blast effect the acceleration short-term effect, it is that intensity raising with material adapts.Thereby be favourable with safe and reliable.This is the basic invention theory of this member.
(3),, not only satisfied waterproof but also satisfied the ductility performance of member with the globality of guaranteeing to make up having strengthened the shock resistance of member and the anti-seismic construction requirement of binomial lamination aspect this people's air defense plate design structure.
(4) this member load is big and under the nuclear blast effect, have good deformability, and member designs should adopt lower proof stress (6K=0.5fptk). and this more helps structure is out of shape recovery characteristics under the nuclear blast effect performance.
Two: with following dimension board is that example is explained: 16.8 meters of spans of slab, and plate is wide 1.2 meters, and rib is high 0.9 meter,, forms Design of Bearing Capacity and be 7T/m with the prestress wire muscle of deciding with common net sheet, riblet, embedded part reinforcing bar and concrete for making
2About, making post net beam and column with conventional method can be 6 * 16.8m, further,, 1.2m superimposed design load Qd wide like: 16.8 meters rib height, 0.9m plate as the big load prestressing force of the large span flute profile superimposed sheet on large span underground garage plate top is 7T/m
2About trough slab, in 6 meters * 16.8 meters left and right sides beam column nets of post net, be placed on the L beam, L beam girder can flush with trough slab top basically.
Further, make 0.12～0.17 meter of in-situ layer onboard, and the cementation of fissures, further waterproof, on add earthing and get final product.
Further, at rib of slab internal fan pipeline, then can on rib of slab, punch if desired, the blower fan passway is done at 4 sealings hole, two sides, hole.As open: 1 meter * 0.4 meter two, get out of the way top wing plate pressure zone about 300, get out of the way the above 200mm of prestressed reinforcement district, bottom 2m, about surplus 0.4m.
Further, center on cementation of fissures formation transversal ventilation passage around the junction between two plates between the air blower tube road junction between trough slab, form the longitudinal ventilation passage to the both sides of the chest sealing, and pass through in the reinforcing that can on girder, punch between the longitudinal ventilation passage.
So just realized as the big load prestressing force of the large span flute profile superimposed sheet of 6 grades and following air's top board underground garage and 6 grades and following air's application as: 1. 16.8 meters span has solved 2 row parking stalls 1 and has drained the corridor problem, than Duoing 10%～20% parking stall or save 10%～20% excavation area with cast-in-place; 2. the L beam has solved a part of floor height reduction problem, and superimposed sheet has solved integrity issues, has formed assembled integral and has not only satisfied the ductility performance of member but also solved the rigidity waterproof problem, and load is at 7T/m
2About, having solved go further on 1.5～1.8 meters the earthing on top fire fighting truck or anti-nuclear blast problem, flute profile has reduced floor height than double T shape, though reduced 1 times the effective area of the wide 1.2m of plate than 2.4m, has lowered 80 yuan/m of cost on the whole
2About, the fan passage mouth does not still reduce for 1.2m, has formed flute profile again, helps the connection of transversal ventilation mouth on the rib, and floor height leaves enough rib height again and punches from 1.2 meters high 0.9m that reduce to of double T plate.If by the situation of normal static(al) loading, 0.9
RiceRib is high, is not enough with identical steel concrete, but is used for the elastic-plastic deformation restoring force characteristic coefficient that the air can utilize this plate fully, improves the drag of member, thereby saves rib height, plate hight, concrete and reinforcing bar greatly and realize.This member load is big and under the nuclear blast effect, have good deformability, and member designs should adopt lower proof stress (6K=0.5fptk). and this more helps structure is out of shape recovery characteristics under the nuclear blast effect performance.
Description of drawings:
The big load prestressing force of large span flute profile superimposed sheet sketch map as basement roof
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in the figure:
The present invention is a flute profile, and span is between the 12-22 rice, and plate is wide to be about 1.2m, and plate hight is about 0.9m, is carried as 3-9T/m
2Between, superimposed trace is arranged on the plate face or reserve exposed steel bar.Water post, L beam with conventional method, break plate on the L beam, make in-situ layer above that, and irritate the plate seam.Make the blower fan pipeline like need, then can be in hole-opening on the position as stated on the rib, and the hole junction forms the transversal ventilation passage around its cementation of fissures between two plates, forms the longitudinal ventilation passage to the both sides of the chest sealing.
Claims (4)
1. the big load prestressing force of the large span flute profile superimposed sheet as 6 grades and following air's top board is characterized in that: span is between 22 meters of 9 meters ∽, and the rib height is between 1.5 meters of 0.8 meter ∽, and between 1.5 meters of the wide 0.9 meter ∽ of plate, design load Qd is: 3 ∽ 9T/m
2Between.
2. the big load prestressing force of the large span flute profile superimposed sheet that is used as 6 grades and following air's top board as claimed in claim 1 is characterized in that: plate is provided with overlapping layers.
3. the big load prestressing force of the large span flute profile superimposed sheet as 6 grades and following air's top board is characterized in that: the main muscle of making trough slab with prestressed reinforcement; Utilize the elastic-plastic deformation restoring force characteristic coefficient of prestressed slab, improve the drag of member under the effect of nuclear blast wave short-term effect.
4. the big load prestressing force of the large span flute profile superimposed sheet that is used as 6 grades and following air's top board as claimed in claim 1 is characterized in that: adopt lower proof stress.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100351998A CN102619300A (en) | 2011-01-28 | 2011-01-28 | Large-span high-load prestressing force groove-shaped composite plate used as top plate of anti-aircraft basement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100351998A CN102619300A (en) | 2011-01-28 | 2011-01-28 | Large-span high-load prestressing force groove-shaped composite plate used as top plate of anti-aircraft basement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304928A (en) * | 2010-06-18 | 2012-01-04 | 柳忠林 | Big-span and big-load prestress trough-shaped laminated plate used as 6-level civil air defence basement roof plate |
| CN102619362A (en) * | 2011-01-28 | 2012-08-01 | 柳忠林 | Large-span and large-load pre-stress groove-shaped composite slab serving as top plate of basement |
| CN102758449A (en) * | 2011-04-26 | 2012-10-31 | 柳忠林 | Large-span prestressed trough composite slab used as roof of air-defense basement |
-
2011
- 2011-01-28 CN CN2011100351998A patent/CN102619300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102304928A (en) * | 2010-06-18 | 2012-01-04 | 柳忠林 | Big-span and big-load prestress trough-shaped laminated plate used as 6-level civil air defence basement roof plate |
| CN102619362A (en) * | 2011-01-28 | 2012-08-01 | 柳忠林 | Large-span and large-load pre-stress groove-shaped composite slab serving as top plate of basement |
| CN102758449A (en) * | 2011-04-26 | 2012-10-31 | 柳忠林 | Large-span prestressed trough composite slab used as roof of air-defense basement |
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Application publication date: 20120801 |