CN101787760A - Steel bar concrete precast floor slab - Google Patents
Steel bar concrete precast floor slab Download PDFInfo
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- CN101787760A CN101787760A CN201010115432A CN201010115432A CN101787760A CN 101787760 A CN101787760 A CN 101787760A CN 201010115432 A CN201010115432 A CN 201010115432A CN 201010115432 A CN201010115432 A CN 201010115432A CN 101787760 A CN101787760 A CN 101787760A
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Abstract
The invention relates to improvement of the traditional steel bar concrete precast floor slab, which is characterized in that the upper surface layer and the lower surface layer of a precast concrete hollow floor slab are internally provided with a two-way steel bar framework, an upper and lower layer connecting steel bar concrete ribs consisting of a vertical steel bar connecting steel bars of the upper surface layer and the lower surface layer and wrapping concrete is arranged between the upper surface layer and the lower surface layer; heat insulation and sound insulation materials are filled between the two steel bar concrete ribs; two sides and two ends of the floor slab in an axial direction are both provided with connecting steel bars and side wings of the extending thickness less than the thickness of the floor slab; and shelf beams at two end parts of the floor slab are internally provided with transverse steel bar frameworks forming beam structures and anti-shearing diagonal steel bars connecting the steel bars at the lower surface layer. The precast floor slab integrates the advantages of the precast floor slab and the cast-in-place floor slab, overcomes all defects of the precast floor slab and the cast-in-place floor slab, especially has small cast-in-place construction workload and high construction speed, can meet requirements of the construction for rapid operation, materials saving and no pollution in an assembled building, accords with the development direction of the building industrialization production, and has high earthquake resistance of the cast-in-place floor slab.
Description
Technical field
The present invention relates to a kind of prefabrication, site assembly formula steel bar concrete precast floor slab, is the improvement to existing steel bar concrete precast floor slab.
Background technology
Commercial affairs, housing construction, floor slab construction workload maximum.Floor is built, and a kind of is prefabrication, is transported to on-the-spot the installation; A kind of is cast in situs.Precast floor slab, economical with materials, quality is secure, and speed of application is fast, the situ wet workload is few, the construction feature of environmental protection is good, favored, but original various prefabricated empty stomach floor (for example Chang Yong hollow floor, the compound floor with ribbing of Chinese patent CN2076141, CN2072898), major defect has: be straight flange around the precast floor slab, lack the firmly whole connection of formation between floor, the composite entity extreme difference, shock resistance is relatively poor; Two floors are subject to expand with heat and contract with cold and make surface layer generation crack cause infiltration; Three be not incubated, sound insulation; Four scale fixed widths are to building change in length bad adaptability.Particularly each connects in abutting connection with lacking firmly between floor, and globality is poor, and shock resistance is poor, is stopped using by builing industry, and people propose all improvement for this reason.
Chinese patent CN2381692, CN2209696, CN2283092, propositions such as 201080668 are provided with the tongue and groove of mutual clamping in the precast floor slab side, connect to strengthen the assembling floor.Chinese patent CN2088572 prefabricated reinforced concrete hollowcore slab, locate to precast a unfilled corner more than 50% in vertical two end thickness, in two hollow plate holes, put into a vertical connecting reinforcement during installation, and horizontal connecting reinforcement is set in the hollowcore slab junction, pour concrete in the oblique angle is to strengthen vertical connection.Yet this shock resistance that interconnects structure is still relatively poor, not anti-high vibration.
Chinese patent CN2351490 is disclosed in precast floor slab, Yi Bian groove suitable for reading is set, another side is provided with the end opening groove, by adjacent floor groove and the groove solution seepage that interlocks; Chinese patent CN2350454 is disclosed in precast floor slab one side and is provided with outside protrusion tank, and opposite side is provided with protruding tank cover plate, and overlap joint solves seepage mutually.Its solution only be to seep water between adjacent floor, to strengthening almost not effect of connection integrity.
Chinese patent CN2148115, CN2323047, CN2364106 precast composite slab are formed surrounding layer by steel concrete rib, top panel and lower panel, in accompany the lightweight packed layer.Its solution only be heat insulation, the sound insulation of floor, other shortcomings do not solve.
Above-mentioned precast floor slab, all just single proposition improves at shortcoming of precast floor slab, does not all solve the precast floor slab shortcoming on the whole, and especially above-mentioned precast floor slab is laid, and does not still reach shockproof requirements, therefore is difficult to obtain practical application.
Chinese patent CN2102963, CN2747298, CN2747299 hollow prefabricated steel bar reinforced concrete boards, be provided with horizontal protrusion piece and stretch out connecting reinforcement at two side bottoms, adjacent assembling bar splicing, concrete is filled in groove cast between two floors, its raising only be horizontal combination connection integrity between floor, other shortcomings of precast floor slab are not overcome.
Chinese patent CN2778930 hollow prefabricated steel bar reinforced concrete boards is provided with in floor two ends bottoms and protrudes platform and connecting reinforcement, its raising only be axial composite entity, other shortcomings of precast floor slab are not overcome.And the actual deck-siding of building usually has only 220-250mm, floor one end approximately has only 80-100mm to put head, if a thin plate is stretched out at two ends, can influence floor put the end stressed, become the structural weak point, can only do little bearing load and width at most less than 1 meter light-duty floor.
Cast-in-situ floor, it is good to have overall structure, stronger shock resistance is arranged, and do not seep water, major defect is: cast-in-situ floor needs on-the-spot formwork erection, cast-in-site, not only workload is big, and the template holding time is long, and need treat after the concrete sclerosis could stripping, and the concrete air-set is long curing period, all cause the site operation cycle long, the construction feature of environmental protection is poor; And the site operation quality assurance is poor, and constructional materials and auxiliary material waste are big, and actual floor cost is much higher than precast floor slab.
For this reason, people propose the laminated floor slab notion, by the thin floor of prefabrication, after lay at the scene of being transported to, cast-in-site coating thereon again, with performance cast-in-situ floor advantage, omit the cast-in-situ floor formwork erection, improve the antiseepage water-based, fill insulant material, also have the heat-and sound-insulating effect, have globality preferably, thereby stronger shock resistance is arranged.For example: Chinese patent CN2362927, CN2407059, CN101565984, CN101581132 etc. are described.Yet laminated floor slab, only be half prefabricated, actual field wet trade cast workload is big (only being to have saved formwork erection) still, not only still needs the long period to wait for the sclerosis of coating concrete, cycle is still longer, the construction feature of environmental protection is poor, is not suitable for the assembled architecture requirement, and actual owing to restricted by the floor integral thickness, precast floor slab thickness is limited, bearing capacity may not reach construction load requirement, so still needs add support to precast floor slab during cast-in-site, otherwise has potential safety hazard; If consider directly carrying cast, then need strengthen precast floor slab thickness, then again can be because of top coating thickness deficiency, and the reduction overall construction intensity causes the shock resistance deficiency.
Chinese patent CN2665258 beam piece composite deck slab gives the system building block in the placement of alternate unit beam interblock, and cast in situs steel bar concrete layer is formed laminated floor slab again.By alternate precast beam, support though can omit when cast-in-place, this structure has increased the floor cost greatly, lacks actual application value.
By above-mentioned numerous prior aries objective showing, though people are by all effort, attempt to solve problems such as floor slab construction, antidetonation, but all be a certain deficiency in the single solution prior art, the uncomprehensive comprehensively deficiency that solves prior art precast floor slab and cast-in-situ floor existence, realize all comprehensive precast floor slab and cast-in-situ floor advantage, overcome both whole shortcomings, and can not satisfy that assembled architecture is quick, saving, pollution-free construction requirement, cause objectively and do not accepted by market, above-mentioned deficiency still has is worth improved place.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of and can overcome prefabricated fully and the cast-in-situ floor shortcoming, and can satisfy that assembled architecture is quick, saving, pollution-free construction requirement, and can adapt to the steel bar concrete precast floor slab in different length house.
The object of the invention realizes that mainly improving one is that the slab thickness face is made a plurality of horizontal H combination hollow structures, at surface layer up and down the two-way concrete slab skeleton is set, and fills insulation, sound insulating material in each horizontal H space; The 2nd, at floor dual-side and two ends, all make band and stretch out side (wing) structure, and the connecting reinforcement of stretching out is arranged; The 3rd, put at both ends the transverse reinforcement skeleton that constitutes girder construction in the beam position, and connects the shearing resistance diagonal reinforcement of lower floor's reinforcing bar, thereby has overcome above-mentioned the deficiencies in the prior art, realizes the object of the invention.Specifically, steel bar concrete precast floor slab of the present invention comprises and fills out insulation, sound insulation materials steel bar concrete precast floor slab in the hollow, it is characterized in that prefabricated concrete hollow floor all has the two-way concrete slab skeleton in the surface layer up and down; The top and bottom interlayer is alternate to be had and connects the vertical reinforcement of surfacing steel bar and the levels connecting reinforcement concrete rib that the parcel concrete constitutes up and down; Be filled with insulation, sound insulation materials between two gluten concrete ribs; Axial both sides of floor and two ends all have stretches out side wing and the connecting reinforcement of thickness less than slab thickness; Put at the floor both ends the transverse reinforcement skeleton that constitutes girder construction in the beam position, and connects the shearing resistance diagonal reinforcement of lower floor's reinforcing bar.
The said steel bar concrete precast floor slab of the present invention:
The side wing of thickness less than slab thickness stretched out at both sides and two ends, and main effect has two: the one, and can make adjacent floor realize whole the connection, improve anti-seismic performance; The 2nd, the side wing is stretched out when laying combination size is big slightly in both sides, can shorten width by knock-off part side wing, adapts to floor laying when the indoor change in length of building.Therefore, both sides are stretched out the side wing and are preferably laminate structure, for conveniently executing making, a kind ofly be preferably its thickness and floor underlayer thickness about equally, both can increase adjacent floor bonding pad rear pouring concrete thickness, strengthen bonding pad intensity and globality, knock-off part when making things convenient for composite floor oversize again.Stressed for improving laying end, axially two ends are stretched out side wing thickness＞axial both sides and are stretched out side wing thickness, and better thickness is that total floor thickness deducts 40-60mm.The bond strength that connects for improving ater-casting and side wing is stretched out the side wing and better is processed into crude and/or vertical bar dowel is set stretching out on the side finned surface.
Put at the floor both ends the transverse reinforcement skeleton that constitutes girder construction in the beam position, and the shearing resistance diagonal reinforcement of connection lower floor reinforcing bar, mainly be to improve floor to shelve the termination stressed, minimizing is thinner than slab thickness relatively and stretches out the intensity decline that the side wing brings because of end face has, guarantee that floor is shelved on no any adding and supports construction operation intensity down.
For satisfying under the intensity of load, save constructional materials as far as possible, weight reduction, a kind of precast floor slab two surface layers that are preferably adopt and not to wait thick structure, are excellent with surface thickness＞underlayer thickness structure especially wherein, can give full play to the then high advantage of tensile strength of concrete compressive strength height, reinforcing bar, by attenuate bottom concrete, save the bottom concrete material, increase surface thickness, improve anti-pressure ability.A kind of better according to floor bearing load (kg/cm
2), surface thickness 40-80mm, middle insulation layer thickness 40-200mm, underlayer thickness 30-50mm.
Fill insulation, sound insulation materials, a kind ofly be preferably axially not break-through, promptly the floor hollow channel axially has the gluten concrete rib of some partitions, and this structure helps improving floor resistance to torsion and bulk strength, is fit to make big width floor, for example 6*4 rice precast floor slab.Alternate gluten concrete rib spacing, a kind of 100-300mm that is preferably, alternate hollow width is excessive, can influence floor strength, too smallly can gain in weight again, therefore proposes the 100-300mm suitable interval.Alternate gluten concrete rib width; be preferably 40-100mm; and enlarged head structure (being that the space is the corner cut structure for four jiaos) has been made at two ends up and down; not only can guarantee has enough toppings around the connecting reinforcement; prevent corrosion of steel bar; but also can strengthen rib and laminate junction intensity up and down, wide actual this necessity of not having.
In addition can also be in precast floor slab be filled pre-buried axial break-through spool, be used to lay electric wire, when finishing, do not need on floor, to slot again.
Can also be provided with the end face steel plate that is connected with cage of reinforcement at the axial two ends of precast floor slab, support as prestressed cable, floor axially has one or some axially extending bores, built-in prestressed cable, make the precast floor slab of band prestressed cable,, reduce slab thickness to improve the floor supporting capacity, reduce reinforcing bar, and make big width floor.The end face steel plate can be to flush the end face setting, the end face setting of contracting in also can being.
Steel bar concrete precast floor slab of the present invention, with respect to prior art, owing to adopt said structure, the gained precast floor slab had both collected precast floor slab and cast-in-situ floor advantage, had overcome their all shortcoming and defect again.Concrete is filled in the cast of adjacent floor bar overlap joint, makes prefabricated laying back form overall structure, is equivalent to cast-in-situ floor, has the high shock resistance and the antiseepage water-based of cast-in-situ floor.Once prefabricated finishing, being transported to on-the-spot directly the laying places, can not need to add in addition support by bearing load, only need the joint face reinforcing bar is connected and the cast ater-casting, follow-up wet trade amount is little, and speed of application is fast, do not need upright in addition the support and auxiliary material, save constructional materials and auxiliary material, and can satisfy that assembled architecture is quick, saving, pollution-free construction requirement, meet industrialization of construction industry production development direction.Hollow horizontal H force structure in cross section is guaranteed good force structure and intensity behind the floor filling light thermal insulation material, and the bearing load height can reduce concrete consumption, weight reduction again.Big thickness side wing and built-in girder construction transverse reinforcement are stretched out in the end, make the floor end become the load-bearing end structure, can guarantee effectively to shelve the load-bearing segment length, this structure also can effectively prevent the danger that the width out-of-flatness may cause floor laterally to fracture and produce, and can make big width floor; Shelve the shearing resistance diagonal reinforcement of the connection lower floor reinforcing bar of end setting, effectively strengthened floor end shear resistance, it is stressed to have improved laying end greatly.Thin side wing is stretched out on both sides, not only helps the whole connection of adjacent floor, can also adapt to house length dimension deviation, adjusts the floor combined width.Middle filling heat insulating wall had both made floor have well heat insulation, soundproof effect, also reduced simultaneously because of floor thickens the increase concrete, weight and the need that cause and increased reinforcing bar.The abovementioned technology utilization makes this patent precast floor slab have stronger practical value.
Below in conjunction with several exemplary embodiments; essence of the present invention is further understood in exemplary illustration and help; but the embodiment detail only is for the present invention is described; do not represent the present invention to conceive whole technical schemes down; therefore should not be construed as the total technical scheme of the present invention is limited; some are In the view of the technician; the unsubstantiality that does not depart from the present invention's design increases and/or change; for example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.
Description of drawings
Fig. 1 is a precast floor slab structural representation of the present invention.
Fig. 2 is two floor combination schematic diagrames.
Fig. 3 is Fig. 2 A-A sectional structure schematic diagram.
Fig. 4 is Fig. 2 B-B sectional structure schematic diagram.
Fig. 5 is that adjacent floor connects enlarged diagram.
The specific embodiment
Embodiment 1: referring to accompanying drawing, each steel bar concrete precast floor slab is made, and approximate size is seen attached list.By weighted design select for use, configuration reinforcement, rolling bottom two-way concrete slab net 9 (comprising and stretch out connecting reinforcement that the major-minor reinforcing bar is determined by design) earlier, and vertical concrete rib steel muscle 11 and 15 is put into mould, cast bottom concrete (comprise and stretch out the side wing).Dwindle placement (reserving rib width) polystyrene foam bar 7 between each rib steel muscle, add and roll surface layer two-way concrete slab net 8, pour into a mould each rib and surface layer concrete, maintenance obtains precast reinforced concrete building plate 1.
The axial both sides of precast floor slab have protruding, identical with underlayer thickness crude face to stretch out side wing 2 and the overlap joint reinforcing bar 5 that is connected with floor bar, and two ends have stretches out thickness and stretch out side wing 3 and overlap joint reinforcing bar 4 less than the crude face of total floor thickness 50mm.Section is shelved at the axial two ends of floor, in girder construction transverse reinforcement cage 12 is arranged, with the shearing resistance diagonal reinforcement 13 that is connected bottom surface steel mesh reinforcement 9.Axially by alternate two gluten concrete ribs 15, axial passage blocked be three sections, the interior polystyrene foam bar 7 of respectively placing between the floor two-ply.Horizontal alternate gluten concrete rib 11, there is enlarged head (two adjacent concrete ribs surround the space and are the corner cut structure for four jiaos) at the two ends up and down that are connected with laminate up and down, and constitute a plurality of horizontal H force structure that links to each other.The floor two ends have hanging of being connected with floor end beam steel 12 to fasten with a rope, string, etc. 6.
The lifting floor is laid and is shelved on the beam 14, adjacent floor is stretched out reinforcing bar be welded to each other connection, pours into a mould high-strength nothing in adjacent floor winding district and shrinks concrete 10, and it is in aggregates that precast floor slab is connected.
Embodiment 2: as embodiment 1, in the heat insulation filling of precast floor slab, be embedded with and axially be used to logical spool, be used to wear discharge lines.
Embodiment 3: as embodiment 1, contracting in omit at the floor two ends respectively has the steel plate that is connected with built-in axial reinforcement, and floor and floor have two axially to be used to through hole, built-in prestressed cable, and prestressed cable two pulling force terminations form the precast floor slab of band prestressed cable outside the steel plate of two ends.
To those skilled in the art; under this patent design and specific embodiment enlightenment; some distortion that can directly derive or associate from this patent disclosure and general knowledge; those of ordinary skills will recognize also can adopt additive method; or the substituting of known technology commonly used in the prior art; and the mutual various combination between feature; for example arrangement of reinforcement changes; floor top and bottom layer thickness variation; the floor wide variety; stretch out vertical bar dowel is set on the side finned surface; hanging button loop changes it into and plays hanging piece; or the like unsubstantiality change, can be employed equally, can both realize this patent representation function and effect; launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
Embodiment precast floor slab unit area load (kg/cm
2) and each several part size (mm)
| Example | Load | Gross thickness | Surface layer is thick | Fill thick | Fill wide | Bottom is thick |
| ??1 | ??150 | ??110 | ??40 | ??40 | ??220 | ??30 |
| ??2 | ??200 | ??130 | ??40 | ??60 | ??220 | ??30 |
| ??3 | ??250 | ??140 | ??45 | ??60 | ??220 | ??35 |
| ??4 | ??350 | ??160 | ??50 | ??70 | ??220 | ??40 |
| ??5 | ??500 | ??200 | ??60 | ??100 | ??220 | ??40 |
| ??6 | ??1000 | ??280 | ??60 | ??175 | ??220 | ??45 |
| ??7 | ??2000 | ??320 | ??80 | ??190 | ??220 | ??50 |
Annotate: floor concrete label is more than the C30, and below the C45, the surfacing steel bar configuration is pressed the load design specifications and calculated arrangement of reinforcement up and down.Side stretches out the same underlayer thickness of side wing thickness, and end face stretches out side wing thickness and is lower than total floor thickness 40-60mm.
Claims (13)
1. steel bar concrete precast floor slab comprises and fills out insulation, sound insulation materials steel bar concrete precast floor slab in the hollow, it is characterized in that prefabricated concrete hollow floor all has the two-way concrete slab skeleton in the surface layer up and down; The top and bottom interlayer is alternate to be had and connects the vertical reinforcement of surfacing steel bar and the levels connecting reinforcement concrete rib that the parcel concrete constitutes up and down; Be filled with insulation, sound insulation materials between two gluten concrete ribs; Axial both sides of floor and two ends all have stretches out side wing and the connecting reinforcement of thickness less than slab thickness; Put at the floor both ends the transverse reinforcement skeleton that constitutes girder construction in the beam position, and connects the shearing resistance diagonal reinforcement of lower floor's reinforcing bar.
2. according to the described steel bar concrete precast floor slab of claim 1, it is characterized in that both sides stretch out side wing thickness and floor underlayer thickness about equally.
3. according to the described steel bar concrete precast floor slab of claim 2, it is characterized in that axial two ends stretch out that side wing thickness＞axially side wing thickness is stretched out on both sides.
4. according to the described steel bar concrete precast floor slab of claim 3, it is characterized in that it is that total floor thickness deducts 40-60mm that side wing thickness is stretched out at axial two ends.
5. according to the described steel bar concrete precast floor slab of claim 1, it is characterized in that floor topping thickness＞underlayer thickness.
6. according to the described steel bar concrete precast floor slab of claim 5, it is characterized in that floor topping thickness 40-80mm, middle insulation layer thickness 40-200mm, underlayer thickness 30-50mm.
7. according to the described steel bar concrete precast floor slab of claim 1, it is characterized in that the axial hollow channel of floor has some partition gluten concrete ribs, fill insulation, axially not break-through of sound insulation materials.
8. according to the described steel bar concrete precast floor slab of claim 1, it is characterized in that alternate gluten concrete rib spacing 100-300mm, self width 40-100mm.
9. described according to Claim 8 steel bar concrete precast floor slab is characterized in that up and down two ends and surface layer are connected with enlarged head to alternate gluten concrete rib.
10. according to the described steel bar concrete precast floor slab of claim 1, it is characterized in that pre-buried axial break-through spool in the precast floor slab filling.
11., it is characterized in that stretching out the side finned surface and be crude and/or stretch out vertical bar dowel is arranged on the side finned surface according to the described steel bar concrete precast floor slab of claim 1.
12., it is characterized in that axial two petiolareas of floor hang button loop or it plays hanging piece according to the described steel bar concrete precast floor slab of claim 1.
13. according to the described steel bar concrete precast floor slab of arbitrary claim in the claim 1 to 12, it is characterized in that the precast floor slab two ends are provided with the end face steel plate that is connected with reinforcing bar, floor axially has one or some axially extending bores, built-in prestressed cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010115432 CN101787760B (en) | 2010-02-26 | 2010-02-26 | Steel bar concrete precast floor slab |
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| CN 201010115432 CN101787760B (en) | 2010-02-26 | 2010-02-26 | Steel bar concrete precast floor slab |
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| CN101787760A true CN101787760A (en) | 2010-07-28 |
| CN101787760B CN101787760B (en) | 2013-05-01 |
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Cited By (8)
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| CN102995807A (en) * | 2012-12-27 | 2013-03-27 | 沈阳易筑建材经销有限公司 | Assembled supporting-free prefabricated light composite floor slab with ribs |
| CN102995804A (en) * | 2012-12-27 | 2013-03-27 | 沈阳易筑建材经销有限公司 | Method for effectively reducing self-weight of prefabricated composite floor slab |
| GB2495401A (en) * | 2011-10-04 | 2013-04-10 | Pce Ltd | Building unit such as a structural floor or roof slab |
| CN104032870A (en) * | 2014-06-06 | 2014-09-10 | 中国十七冶集团有限公司 | Integrally fabricated box-shaped multi-ribbed composite floor |
| CN106284784A (en) * | 2015-06-26 | 2017-01-04 | 上海瑞房地产开发有限公司 | A kind of full Prefabricated Concrete floor for building |
| CN110821022A (en) * | 2019-11-28 | 2020-02-21 | 怀化远大建筑工业有限公司 | Full-prefabricated high-strength PC floor in steel construction that can install fast |
| CN111472488A (en) * | 2020-05-29 | 2020-07-31 | 抚州玉茗远大建筑工业有限公司 | Assembled full-prefabricated floor slab structure and construction method thereof |
| CN113513178A (en) * | 2021-03-02 | 2021-10-19 | 江苏吴中建设集团有限公司 | Rack-shaped seam assembly type beam plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104032870A (en) * | 2014-06-06 | 2014-09-10 | 中国十七冶集团有限公司 | Integrally fabricated box-shaped multi-ribbed composite floor |
| CN106284784A (en) * | 2015-06-26 | 2017-01-04 | 上海瑞房地产开发有限公司 | A kind of full Prefabricated Concrete floor for building |
| CN110821022A (en) * | 2019-11-28 | 2020-02-21 | 怀化远大建筑工业有限公司 | Full-prefabricated high-strength PC floor in steel construction that can install fast |
| CN111472488A (en) * | 2020-05-29 | 2020-07-31 | 抚州玉茗远大建筑工业有限公司 | Assembled full-prefabricated floor slab structure and construction method thereof |
| CN113513178A (en) * | 2021-03-02 | 2021-10-19 | 江苏吴中建设集团有限公司 | Rack-shaped seam assembly type beam plate |
| CN113513178B (en) * | 2021-03-02 | 2022-11-01 | 江苏吴中建设集团有限公司 | Rack-shaped seam assembly type beam plate |
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|---|---|
| CN101787760B (en) | 2013-05-01 |
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