CN201087489Y - Prefabricated floor - Google Patents

Prefabricated floor Download PDF

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Publication number
CN201087489Y
CN201087489Y CNU200720173478XU CN200720173478U CN201087489Y CN 201087489 Y CN201087489 Y CN 201087489Y CN U200720173478X U CNU200720173478X U CN U200720173478XU CN 200720173478 U CN200720173478 U CN 200720173478U CN 201087489 Y CN201087489 Y CN 201087489Y
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CN
China
Prior art keywords
rolled forming
forming section
cold
edge sealing
right edge
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Expired - Fee Related
Application number
CNU200720173478XU
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Chinese (zh)
Inventor
赵建国
季小莲
候兆欣
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China Jingye Engineering Corp Ltd
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China Jingye Engineering Corp Ltd
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Priority to CNU200720173478XU priority Critical patent/CN201087489Y/en
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Publication of CN201087489Y publication Critical patent/CN201087489Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a precast floor slab and consists of a steel frame and concrete poured into the steel frame. The steel frame consists of a left edge-sealing roll formed shape, a plurality of middle roll formed shapes, a right edge-sealing roll formed shape and a plurality of constructional steel bars. The middle roll formed shapes are evenly distributed and arranged parallel to each other between the left edge-sealing roll formed shape and the right edge-sealing roll formed shape. A plurality of constructional steel bars are evenly and vertically arranged on the upper ends and the lower ends of the left edge-sealing roll formed shape and the right edge-sealing roll formed shape. Each constructional steel bar is respectively welded with the left edge-sealing roll formed shape, the right edge-sealing roll formed shape and the middle roll formed shapes to form the steel frame. The left edge-sealing roll formed shape and the right edge-sealing roll formed shape are arranged along the length direction of the floor slab. The steel plate below the central section of the cross section of the left edge-sealing roll formed shape protuberates outwards to form a lower interdigitating interface. The steel plate above the central section of the cross section of the right edge-sealing roll formed shape protuberates outwards to form an upper interdigitating interface. The ventral shield of the middle roll formed shape is provided with a plurality of punches.

Description

Precast floor slab
Technical field
The utility model relates to a kind of floor for building, particularly relates to a kind of precast floor slab.
Background technology
Known floor framing is to be formed by the certain method manufacturing by main materials such as plain bars, prestressed reinforcement, profiled sheet and ordinary concretes.At present, China under construction the main way of floor have: prefabricated assembled superstructure, profiled sheet+cast in place reinforced bar precast floor slab, cast in place reinforced bar precast floor slab, prestressed slab (prefabricated)+cast-in-place overlapping layers floor.These ways respectively have characteristics, but deficiency is also respectively arranged.Briefly introduce one by one below:
1. prefabricated assembled superstructure
The tradition housing construction mostly is the combination construction form, horizontal wall load-bearing and form superstructure with the assembling of prefabricated circular hole slab.Initial precast plate right and wrong are prestressed, afterwards with cold-drawn low-carbon (LC) reinforcing bar arrangement of reinforcement, save arrangement of reinforcement, improve cracking resistance.This prestressing force short circular hole slab span is no more than 3.9m, satisfies the requirement of the standard width of a room in an old-style house between housing types just; Load 5KN/m 2About, adapt to the requirement of dwelling house load; C30 level concrete, thickness of slab 120mm, arrangement of reinforcement 3~6kg/m 2Plate is freely-supported on the wall, and the anchor bar interconnection of stretching out is also used the concrete cementation of fissures, about the wide 20mm of plate latasuture, is in the milk with pea gravel concrete.
This prefabricated assembled superstructure material consumption is few, saves reinforcing bar, and technology is simple, and compliance is strong.But there is open defect in this floor system:
(1) span is less, and it is lower to can bear load.
(2) cold-finished steel intensity low (650MPa), elongation rate is little, brittle failure easily.
(3) cold-drawn bar smooth surface, anchoring property is poor, and transmission length of prestress is big, stripped thread takes place when technological operation is bad easily lose anchor destruction.
(4) member is pressed freely-supported one-way slabs design and stressed, and " faulting of slab ends " and longitudinal crack take place splicing place of plate side easily.Not only influence sight also may cause problems such as seepage.
(5) superstructure simply is assembled into by each precast plate, lacks between each precast plate and plate end and the supporting construction effectively to be connected, and overall performance is poor, is difficult to satisfy the anti-seismic construction requirement.
(6) the member product technology content is low, the quality instability.
2. in-situ deposited prefabricated floor
Because concrete material changes and the progress of construction technology, the concrete cast-in-situ superstructure obtains promoting in dwelling construction in recent years:
(1) flat shape of in-situ deposited prefabricated floor, size, span and load can be selected and adjustment according to the design needs, bigger flexibility and degree of freedom are arranged, the easier requirement of satisfying function of use.
(2) cast-in-place structural good integrity is connected reliably with adjacent superstructure and lower support structure, and anti-seismic performance is good; Usually with the hot-rolled reinforced bar arrangement of reinforcement, ductility is improved greatly.
(3) appearance, the particularly development of template leasing industry of new type formwork forms such as typing punching block, gang form, plastic formwork make most unit in charge of construction all possess the condition of cast-in-situ concrete construction.Add commercial concrete and pumping technology, the cast-in-situ floor cost is reduced, have competitiveness.With regard to housing construction, the form of structure of cast-in-place concrete building roof is as follows at present: superstructure is bearing on brick wall or the concrete wall, span 4~7m, and thickness of slab 100~200mm (span 1/40~1/35), strength grade of concrete are C20~C25 level.With collar tie beam or the pouring of bearing one, press the two-way continuous slab design, reinforcing bar is elongated at the bottom of the plate, and plate face negative reinforcement is along periphery, scope is 1/7~1/4 of a span, and reinforcing bar is generally hot rolling I level, II grade reinforcing steel, diameter 8~14mm, spacing 150~200mm, steel using amount 15~40kg/m 2
The problem that cast-in-place concrete building roof exists:
(1) span generally is no more than 6m, at the most to about the 7m; Concrete thickness under the two-way slab without beams condition is limited, so bearing capacity is limited.
(2) Crack Control poor-performing: the cast-in-place globality that causes has caused strong constraint to floor distortion, and is therefore relatively responsive to concrete shrinkage, the temperature difference, sedimentation etc., causes restraint stress easily and causes the crack.
(3) construction is complicated, and the duration is longer.Operations such as cast-in-place concrete building roof construction needs formwork, ties up muscle, builds, maintenance, form removal, not only complex process but also long construction period.Situ wet operation in the construction also can cause noise and environment pollution.Consumptive material is many, from great: the cast-in-place concrete building roof general section is bigger, and volume of concrete is big, and dead load is big.
3. complete cast-in-place no bonding (or having bonding) prestressing force superstructure
At present, cast-in-situ prestressed concrete superstructure idol has application; Span is 6~12m, load 10KN/m 2, two-way slab without beams; Thickness of slab 200~250mm; Strength grade of concrete C30; With the form arrangement of reinforcement of seven strands of steel strand with no bonding prestress bundle; Interfascicular is apart from 200~300mm; Reach certain intensity with post tensioning at concrete, and be anchored on the edge member with anchor clamp; For guaranteeing ductility, pressing code requirement also must a considerable amount of non-prestressing tendon of configuration.The cast-in-situ prestressed concrete superstructure has following characteristics:
(1) can provide than large bay
(2) stride greatly, heavy duty, ductility is good, and overall performance is strong, and cracking resistance and Crack Control performance are good.
(3) construction is complicated, and the cycle is long, formwork, cloth muscle, build, complex process such as maintenance, stretch-draw, anchoring, form removal are consuming time, the defective that influences cast-in-place concrete structures such as environment still exists.
(4) technical difficulty is big, and supporting on-the-spot pre-stress construction equipment, technology and management must be arranged.
(5) cost obviously increases: the quantity of reinforcement of high strength steel strand is about 4~7kg/m 2, but the nonprestressed reinforcement consumption of coupling reaches 15~30kg/m 2About; Actual presstressed reinforcing steel mainly plays the cracking resistance effect but not improves bearing capacity.Add that concrete strength improves and the requirement of ductility aspect, cost obviously rises.
4. prestressed slab+overlapping layers superstructure
Iterative structure be between prefabricated and cast-in-place between a kind of form of structure.Its bottom is prefabricated, lifting plate effect when building top overlapping layers concrete, and become the part of iterative structure after solidifying at the back pouring concrete, form the stressed state of integral body.Prestressing force bidirectional laminated slab superstructure has following characteristics:
(1) stride greatly (9~10m), heavy duty (10~20kN/m 2).
(2) shape, size can satisfy the building layout requirement by adjusting piece width and the microscler shape of plate.
(3) the prestressing force laminated floor slab thickness of no beam is very little, and effectively floor height increases.
(4) the Crack Control performance of floor is good, the cracking resistance height, and fractue spacing is fine and closely woven, and existing crack can be closed after unloading, unlikely cracking of piece and faulting of slab ends between plate.
(5) structure is the two-way slab of four limit build-ins, and rigidity is big, and amount of deflection is little.
(6) good integrity of floor slab structure has close globality and anti-seismic performance with cast-in-place structural.
(7) structure ductility is good.
(8) concrete and amount of reinforcement significantly reduce, and not only save cost, reduce making, transportation, construction working amount, and help alleviating dead load.
(9) the prefabricated panel batch production quality of production is stable, meets the direction of large-scale production and housing industrialization.
(10) still there is a certain amount of situ wet operation.
5. profiled sheet+concrete combined floor
This kind floor is with the permanent formwork of profiled sheet as fluid concrete, and after treating that concrete reaches design strength, profiled sheet and concrete be co-operation still, and it has following characteristics:
(1) profiled sheet is light, is easy to carry and set up, and shortens the set-up time greatly.
(2) profiled sheet is convenient to lay modernized pipelines such as communication, electric power, ventilation, heating; Can also lay warming, sound insulation, heat insulation, shock insulation material.Ceiling can be directly done on the profiled sheet surface; If need furred ceiling, can in the profiled sheet groove, fixed ceilings link up with, easy to use.
(3) in many, highrise building, adopt profiled sheet, help the multilayer operation, speed up the work.
(4) transportation of profiled sheet, storage, stacking and loading and unloading are all very convenient.
(5) profiled sheet and concrete make the two form integral body by the bonding effect of superposed surfaces, and the floor overall performance is good.
(6) profiled sheet exposes, and must do zinc-plated antirust processing.
(7) still there is the drawback of situ wet operation.
Summary of the invention
Goal of the invention of the present utility model is to provide a kind of precast floor slab, and this plate can not only satisfy the requirement of building function, structural performance, also is suitable for batch production production, convenient construction, and it overcomes many deficiencies of existing floor, adapts to the trend of architectural industrialization.
In order to finish goal of the invention of the present utility model, precast floor slab of the present utility model, it comprises: steel frame and the concrete that is cast in the steel frame, wherein: described steel frame is by left edge sealing cold-rolled forming section, several middle part cold-rolled forming sections, right edge sealing cold-rolled forming section and several distributing bars constitute, several middle part cold-rolled forming sections evenly distribute and layout parallel to each other between left edge sealing cold-rolled forming section and right edge sealing cold-rolled forming section, at vertical several distributing bars of evenly arranging of left edge sealing cold-rolled forming section with the top and bottom of right edge sealing cold-rolled forming section, every distributing bar respectively with left edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and several are arranged in middle part cold-rolled forming section welding and form steel frame, left side edge sealing cold-rolled forming section and right edge sealing cold-rolled forming section are arranged along the plate length direction, the following outside projection of steel plate in edge sealing cold-rolled forming section cross section middle part, a left side forms down mismatch, the above outside projection of steel plate in right edge sealing cold-rolled forming section cross section middle part forms mismatch, has several on the web of middle part cold-rolled forming section and punches;
Precast floor slab of the present utility model, wherein: there is chamfering the bending place of described left edge sealing cold-rolled forming section and right edge sealing cold-rolled forming section top and bottom;
Precast floor slab of the present utility model, wherein: the top and bottom of described left edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and several middle part cold-rolled forming sections have several concavo-convex teeth groove respectively, and they evenly distribute along its length along the top and bottom of left edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and several middle part cold-rolled forming sections respectively;
Precast floor slab of the present utility model, wherein: described concavo-convex teeth groove is the rectangle tongue;
Precast floor slab of the present utility model, wherein: the cross section of described middle part cold-rolled forming section is C type or Z type;
Precast floor slab of the present utility model, wherein: the described aperture that punches is the 1/2-3/5 of middle part cold-rolled forming section height, the spacing between adjacent punching be punch the aperture 2-3 doubly;
Precast floor slab of the present utility model, wherein: the height of described left edge sealing cold-rolled forming section and right edge sealing cold-rolled forming section is identical with the thickness of floor, the height of middle part cold-rolled forming section is less than the height 30-40mm of left edge sealing cold-rolled forming section, spacing between the cold-rolled forming section of adjacent middle part is 150-250mm, and the spacing between adjacent distributing bar is 150-200mm;
Precast floor slab of the present utility model, wherein: described concrete is a light weight aggregate concrete, its unit weight is 900-1900kg/m 3
Precast floor slab of the present utility model, wherein: the thickness of described precast floor slab is 1/35-1/40 with the ratio of length.
The utility model is compared with existing precast floor slab, and steel frame of the present utility model adopts cold-rolled forming section C type or Z-shape steel, fills with light weight concrete construction.Concavo-convex teeth groove is made in the top and bottom of left side edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and middle part cold-rolled forming section, punching on the web of middle part cold-rolled forming section connects concrete, add the ability that bonds between reinforced concrete and the steel, make the two compatible deformation, co-operation.Left side edge sealing cold-rolled forming section and right edge sealing cold-rolled forming section are made following mismatch and the last mismatch of stinging dentation respectively, realize the overlap joint of plate and plate by the interlock of following mismatch and last mismatch.Distributing bar and left edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and the welding of middle part cold-rolled forming section make the formation steel frame.
Cold-rolled forming section steel frame and light precast floor slab can be realized prefabrication, and be connected with steel frame or steel structure frame in the wallboard by rational form, realize being connected of on-the-spot steel and steel, can give full play to its advantage in multilayer (1~6 layer) structure, it has the following advantages:
(1) owing to the existence of reinforcing bar, this floor can bear bigger load, can do bigger span, provide than large bay, is adapted to the requirement of modern architecture for structural performance.By rational design, can reach the building span requirement of 6m~8m, have certain superiority.
(2) Crack Control is functional: element precast is the effective ways in control crack, and this floor can be realized the strictness control to the crack all by prefabrication.Floor edge sealing cold-rolled forming section is made and is stung dentation, realizes the overlap joint of plate and plate by stinging tooth, avoids producing the crack.
(3) site operation efficient can be ensured the quality of products and improve to batch production production: member is large-scale production in the factory for prefabrication, and cost is low, quality is high, is the developing direction of builing industry.The situ wet operation reduces significantly, and labour intensity reduces, and condition of work is improved.And the operation minimizing, shortened the engineering time greatly.
(4) adopt light material, alleviate dead load: because the floor weight reduction can correspondingly reduce the cross section of structural element such as beam, post and basis, thereby help the reduction of structural cost.Dead load reduces also to have improved its anti-seismic performance.
(5) be easy to construction and installation: the steel frame in the floor is easy to be connected with steel frame or steel structure frame, and steel and steel direct is connected and by rational construction measure it formed firmly and connect, and integrality performance of the structure is good.
Description of drawings is described further the utility model below in conjunction with accompanying drawing.
Fig. 1 is the cross-sectional profile schematic diagram of the utility model first embodiment, and middle part cold-rolled forming section wherein is a C type cold-rolled forming section;
Fig. 2 is bowing to schematic diagram of Fig. 1;
It among Fig. 3 the side schematic view of C type middle part cold-rolled forming section among Fig. 1;
Fig. 4 is the cross section view of the utility model second embodiment, and middle part cold-rolled forming section wherein is a Z type cold-rolled forming section;
Fig. 5 is the partial schematic diagram of the edges of boards interlock shape of two blocks of precast floor slabs.
The specific embodiment
Embodiment 1
As shown in Figures 1 to 3, the utility model precast floor slab comprises: steel frame and the concrete 5 that is cast in the steel frame, steel frame is by left edge sealing cold-rolled forming section 2, several middle part cold-rolled forming sections 7, right edge sealing cold-rolled forming section 10 and several distributing bars 6 constitute, several middle part cold-rolled forming sections 7 evenly distribute and layout parallel to each other between left edge sealing cold-rolled forming section 2 and right edge sealing cold-rolled forming section 10, at vertical several distributing bars 6 of evenly arranging of left edge sealing cold-rolled forming section 2 with the top and bottom of right edge sealing cold-rolled forming section 10, every distributing bar 6 respectively with left edge sealing cold-rolled forming section 2, cold-rolled forming section 7 welding that right edge sealing cold-rolled forming section 10 and several are arranged in the middle part form steel frame, left side edge sealing cold-rolled forming section 2 and right edge sealing cold-rolled forming section 10 are arranged along the floor length direction, the following outside projection of steel plate in edge sealing cold-rolled forming section 2 cross sections middle part, a left side forms down mismatch 1, the above outside projection of steel plate in right edge sealing cold-rolled forming section 10 cross sections middle part forms mismatch 9, has several on the web 11 of middle part cold-rolled forming section 7 and punches 8.
As Fig. 1 and shown in Figure 5, there is chamfering 3 bending place of left edge sealing cold-rolled forming section 2 and right edge sealing cold-rolled forming section 10 top and bottom.After two precast floor slab butt joints, two blocks of precast floor slabs are welded together at this chamfering place.
As shown in Figure 1 to Figure 3, the top and bottom of left side edge sealing cold-rolled forming section 2, right edge sealing cold-rolled forming section 10 and several middle part cold-rolled forming sections 7 have several concavo-convex teeth groove 4 respectively, they are the rectangle tongue, and they evenly distribute along the length direction of left edge sealing cold-rolled forming section 2, right edge sealing cold-rolled forming section 10 and several middle part cold-rolled forming sections 7 respectively.Their effect is: strengthen the ability that bonds between left edge sealing cold-rolled forming section, right edge sealing cold-rolled forming section and middle part clod wash type and the concrete.
As shown in Figure 3,8 the aperture of punching is the 1/2-3/5 of middle part cold-rolled forming section 7 height, the adjacent spacing that punches 8 be punch 8 hole diameters 2-3 doubly.
As shown in Figure 1, the height of left edge sealing cold-rolled forming section 2 and right edge sealing cold-rolled forming section 10 is identical with the thickness of floor, and the height of middle part cold-rolled forming section 7 is less than the height 30-40mm of left edge sealing cold-rolled forming section 2.Middle part cold-rolled forming section 7 is in the central authorities of precast floor slab thickness, and middle part cold-rolled forming section 7 is 15-20mm apart from the distance at the two ends up and down of precast floor slab.
As depicted in figs. 1 and 2, the spacing that adjacent middle part cold-rolled forming section is 7 is 150-250mm, and the spacing between the adjacent distributing bar 6 is 150-200m.Concrete is a light weight concrete construction, and its unit weight is 900-1900kg/m 3The thickness of precast floor slab is 1/35-1/40 with the ratio of length.
Embodiment 2
As shown in Figure 4, embodiment 2 is substantially the same manner as Example 1, and institute's difference is: the cross section of middle part cold-rolled forming section 7 is the Z type.
Above embodiment is not the qualification to utility model just to explanation of the present utility model, and the utility model institute restricted portion is referring to claim, and under the situation of spirit of the present utility model, the utility model can be done any type of modification.

Claims (9)

1. precast floor slab, it comprises: steel frame and the concrete (5) that is cast in the steel frame, it is characterized in that: described steel frame is by left edge sealing cold-rolled forming section (2), several middle part cold-rolled forming sections (7), right edge sealing cold-rolled forming section (10) and several distributing bars (6) constitute, several middle part cold-rolled forming sections (7) evenly distribute and layout parallel to each other between left edge sealing cold-rolled forming section (2) and right edge sealing cold-rolled forming section (10), at vertical several distributing bars (6) of evenly arranging of left edge sealing cold-rolled forming section (2) with the top and bottom of right edge sealing cold-rolled forming section (10), every distributing bar (6) respectively with left edge sealing cold-rolled forming section (2), cold-rolled forming section (7) welding that right edge sealing cold-rolled forming section (10) and several are arranged in the middle part forms steel frame, left side edge sealing cold-rolled forming section (2) and right edge sealing cold-rolled forming section (10) are arranged along the floor length direction, the following outside projection of steel plate in edge sealing cold-rolled forming section (2) cross section middle part, a left side forms down mismatch (1), the above outside projection of steel plate in right edge sealing cold-rolled forming section (10) cross section middle part forms mismatch (9), has several punch (8) on the web (11) of middle part cold-rolled forming section (7).
2. precast floor slab as claimed in claim 1 is characterized in that: there is chamfering (3) bending place of described left edge sealing cold-rolled forming section (2) and right edge sealing cold-rolled forming section (10) top and bottom.
3. precast floor slab as claimed in claim 2, it is characterized in that: the top and bottom of described left edge sealing cold-rolled forming section (2), right edge sealing cold-rolled forming section (10) and several middle part cold-rolled forming sections (7) have several concavo-convex teeth groove (4) respectively, and they evenly distribute along its length along the top and bottom of left edge sealing cold-rolled forming section (2), right edge sealing cold-rolled forming section (10) and several middle part cold-rolled forming sections (7) respectively.
4. precast floor slab as claimed in claim 3 is characterized in that: described concavo-convex teeth groove (4) is the rectangle tongue.
5. as claim 3 or 4 described precast floor slabs, it is characterized in that: the cross section of described middle part cold-rolled forming section (7) is C type or Z type.
6. precast floor slab as claimed in claim 5 is characterized in that: the aperture of described punching (8) is the 1/2-3/5 of middle part cold-rolled forming section (7) height, and the spacing between adjacent punching (8) is 2-3 times of (8) aperture that punches.
7. precast floor slab as claimed in claim 6, it is characterized in that: described left edge sealing cold-rolled forming section (2) is identical with slab thickness with the height of right edge sealing cold-rolled forming section (10), the height of middle part cold-rolled forming section (7) is less than the height 30-40mm of left edge sealing cold-rolled forming section (2), spacing between adjacent middle part cold-rolled forming section (7) is 150-250mm, and the spacing between adjacent distributing bar (6) is 150-200mm.
8. precast floor slab as claimed in claim 7 is characterized in that: described concrete is a light weight aggregate concrete, and its unit weight is 900-1900kg/m 3
9. precast floor slab as claimed in claim 8 is characterized in that: the thickness of described precast floor slab is 1/35-1/40 with the ratio of length.
CNU200720173478XU 2007-09-29 2007-09-29 Prefabricated floor Expired - Fee Related CN201087489Y (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011442A (en) * 2009-09-07 2011-04-13 初明进 Light steel-concrete combination structure shear wall and manufacturing method thereof
CN103132598A (en) * 2011-11-28 2013-06-05 张永清 Industrialized environment-friendly anti-seismic exquisite building
CN104499598A (en) * 2014-11-25 2015-04-08 张跃 Steel wire core modular heat insulation inner wall
CN106522436A (en) * 2016-12-22 2017-03-22 中冶京诚工程技术有限公司 Prefabricated light floor slab
CN110284642A (en) * 2019-06-25 2019-09-27 长安大学 A kind of hollow two-way floor forming method of full bolt assembled and its node
CN113585048A (en) * 2021-09-07 2021-11-02 中南大学 Steel skeleton concrete slab and wet joint structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011442A (en) * 2009-09-07 2011-04-13 初明进 Light steel-concrete combination structure shear wall and manufacturing method thereof
CN103132598A (en) * 2011-11-28 2013-06-05 张永清 Industrialized environment-friendly anti-seismic exquisite building
CN103132598B (en) * 2011-11-28 2015-09-09 张永清 Industrialization environment-friendlyanti-seismic anti-seismic exquisite is built
CN104499598A (en) * 2014-11-25 2015-04-08 张跃 Steel wire core modular heat insulation inner wall
CN106522436A (en) * 2016-12-22 2017-03-22 中冶京诚工程技术有限公司 Prefabricated light floor slab
CN110284642A (en) * 2019-06-25 2019-09-27 长安大学 A kind of hollow two-way floor forming method of full bolt assembled and its node
CN113585048A (en) * 2021-09-07 2021-11-02 中南大学 Steel skeleton concrete slab and wet joint structure

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Granted publication date: 20080716

Termination date: 20091029