CN204645396U - The ultra-high performance concrete cover plate that a kind of angle steel is optimized - Google Patents
The ultra-high performance concrete cover plate that a kind of angle steel is optimized Download PDFInfo
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- CN204645396U CN204645396U CN201520323558.3U CN201520323558U CN204645396U CN 204645396 U CN204645396 U CN 204645396U CN 201520323558 U CN201520323558 U CN 201520323558U CN 204645396 U CN204645396 U CN 204645396U
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Abstract
The utility model discloses the ultra-high performance concrete cover plate that a kind of angle steel is optimized, comprise ultra-high performance concrete layer, the cage of reinforcement being parallel to cover plate lower surface is provided with in described ultra-high performance concrete layer, cage of reinforcement is apart from cover plate lower surface 10 ~ 20mm, cage of reinforcement welds primarily of the principal rod of longitudinally setting and the distribution bar of horizontally set or ties up and forms, described distribution bar is positioned at above principal rod, the top of cage of reinforcement is welded with the some angle steel be parallel to each other closely, the length direction of angle steel is consistent with the length direction of principal rod, the distance of angle steel distance cover plate top and four sides is 10 ~ 20mm.The advantage of angle steel and reinforcing bar is combined togather by the utility model, has both given full play to the feature that angle steel resistance to deformation is strong and bearing capacity is high, also retains the effect that bottom layer of the reinforcing steel improves cover plate cracking resistance and bearing capacity, improves the supporting capacity of cover plate further.
Description
Technical field
The utility model belongs to building material field, is specifically related to
oneplant angle steel and optimize ultra-high performance concrete cover plate.
Background technology
Ultra-high performance concrete, be called for short UHPC (Ultra-High Performance Concrete), be the most innovative cement based engineering material in past 30 years, achieve the Great span of engineering material performance, its one of them representative is RPC.
RPC (Reactive Powder Concrete, be abbreviated as RPC): be made up of composite fibre such as multicomponent reactive powder blend material, inorganic coagulation material, continuous grading fines, steel fibres, by optimization gradation design, make the defect of material internal (hole and microcrack) be reduced to minimum, there is the novel concrete based composites of superhigh intensity, high tenacity, high-durability, high crack-resistant and good volume stability.Because in RPC, the existence of steel fibre strengthens the interlocking of Behavior of Hardened Cement Paste, the tensile strength of this material is largely increased, reach 4 ~ 6 times of high-strength concrete, limit tensile strain can reach 70 ~ 80 times of high-strength concrete especially, fracture toughness is more than 250 times of ordinary concrete, and its mechanical property and deformability are obviously better than ordinary concrete and high-strength concrete.Therefore this material is applicable to there is high-strength, lightweight to structure, resistance is split, the Structural Engineering field of life requirement.
Cover plate prepared by ultra-high performance concrete, relative to traditional concrete cover, its supporting capacity and endurance quality are all enhanced.Simultaneously due to the raising of its supporting capacity, under same bearer Capability Requirement, the thickness of cover plate can suitably reduce, and effectively can solve the too thick and heavy problem of conventional concrete cover plate.Along with the continuous popularization of ultra-high performance concrete cover plate, the field related to is more and more wider, also more and more higher to the requirement of its bearing capacity.But under the arrangement of reinforcement system of the high reinforcement ratio of existing ultra-high performance concrete cover plate, under the prerequisite ensureing identical cover sheet thickness, be difficult to the supporting capacity improving cover plate further.Such as the driving electric power cover plate that 80mm is thick, when bi-layer compact joins presstressed reinforcing steel, its ultimate bearing capacity still can only reach the C250 grade in GB " steel fibre concrete manhole ".Therefore must existing arrangement of reinforcement system be made innovation and be changed and the supporting capacity grade of cover plate could be improved when ensureing that thickness is constant.
The ability due to angle steel with very strong resistance to deformation has very high bearing capacity simultaneously, the upper placing of reinforcement skeleton in cover plate double arrangement of reinforcement system is replaced with it, retain placing of reinforcement skeleton, rough surface process is carried out to angle steel simultaneously, ensure the cementitiousness that itself and ultra-high performance concrete are good.This novel arrangement of reinforcement system can give full play to the feature that angle steel supporting capacity is high, resistance to deformation is strong, the good cracking resistance of bottom layer of the reinforcing steel can be retained again, also make cover plate remain good ductility, both combination complementations can make the supporting capacity of ultra-high performance concrete cover plate be further improved.
Utility model content
The purpose of this utility model there are provided ultra-high performance concrete cover plate of a kind of angle steel optimization and preparation method thereof, the upper placing of reinforcement skeleton in cover plate double arrangement of reinforcement system is replaced with angle steel, retain placing of reinforcement skeleton, both the feature that angle steel supporting capacity is high, resistance to deformation is strong had been given full play to, retain again the good cracking resistance of bottom layer of the reinforcing steel, also make cover plate remain good ductility, by both combination complementations, the supporting capacity of ultra-high performance concrete cover plate is further enhanced.
For achieving the above object, the utility model can take following technical scheme:
The ultra-high performance concrete cover plate that a kind of angle steel is optimized, comprise ultra-high performance concrete layer, the cage of reinforcement being parallel to cover plate lower surface is provided with in described ultra-high performance concrete layer, described cage of reinforcement is apart from cover plate lower surface 10 ~ 20mm, described cage of reinforcement welds primarily of the principal rod of longitudinally setting and the distribution bar of horizontally set or ties up and forms, described distribution bar is positioned at above principal rod, the top of described cage of reinforcement is welded with the some angle steel be parallel to each other closely, the length direction of described angle steel is consistent with the length direction of principal rod, the distance of described angle steel distance cover plate top and four sides is 10 ~ 25mm.
Further, described principal rod diameter is 6 ~ 20mm, and principal rod diameter 2mm more than larger than distribution bar.
Further, described principal rod and distribution bar adopt hot-rolled reinforced bar, hard drawn wire reinforcement or PC rod iron.
Further, described angle steel is hot rolling equal angle steel, and during welding, the drift angle of described angle steel upward.
Further, described angle steel is hot rolling unequal angle, and during welding, a limit of described angle steel is horizontally disposed with.
Further, the thickness of the ultra-high performance concrete cover plate of described angle steel optimization is more than or equal to 80mm.
Further, the compressive strength of described ultra-high performance concrete is more than or equal to 140MPa.
The utility model additionally provides the preparation method of the ultra-high performance concrete cover plate that a kind of angle steel is optimized, and comprises step:
1) according to the modes of emplacement of the size of cover plate, protective layer thickness and angle steel, screwing steel bars skeleton, selects suitable angle steel specification;
2) angle steel and cage of reinforcement are welded and fixed, make upper strata angle steel be parallel to bottom layer of the reinforcing steel skeleton, and make both fit tightly;
3) hang in mould cavity by the angle steel welded and cage of reinforcement, angle steel near mould lower surface, and makes angle steel 4 and cage of reinforcement reserve the protective layer thickness of 10 ~ 20mm with upper and lower end face and each side;
4) toppled over by the ultra-high performance concrete mixed and inject floating cover plate external surface after mould cavity vibration moulding, angle steel and cage of reinforcement are controlled in cover plate inside and reserve satisfactory protective layer thickness;
5) cover plate is carried out maintenance together with mould, continue maintenance after the demoulding and meet the demands to performance, obtain the ultra-high performance concrete cover plate that angle steel is optimized.
Further, described step 5) specifically comprise: cover plate is carried out stream curing together with mould, environment temperature remains 40 DEG C of maintenances 24 hours, takes out form removal afterwards and under 85 DEG C of conditions, continues maintenance 48 hours again, obtain the ultra-high performance concrete cover plate that angle steel is optimized.Ultra-high performance concrete cover plate optimized by the angle steel that the utility model provides, and has the following advantages relative to prior art tool:
1) advantage of angle steel and reinforcing bar is combined, both the feature that angle steel resistance to deformation is strong and bearing capacity is high had been given full play to, also retain the effect that bottom layer of the reinforcing steel improves cover plate cracking resistance and bearing capacity, on the basis of double steel bar arrangement of reinforcement system, the supporting capacity of cover plate can be improved further.
2) prolongation in application life of ultra-high performance concrete cover plate optimized by angle steel.
The utility model will be played a great role at building, power domain, have a extensive future, have good technical economic benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the generalized section of the utility model embodiment 1;
Fig. 3 is the structural representation of the utility model embodiment 2;
Fig. 4 is the generalized section of the utility model embodiment 2;
Shown in figure be: 1-principal rod; 2-distribution bar; 3-ultra-high performance concrete layer; 4-angle steel.
Detailed description of the invention
Be described in further detail the purpose of this utility model below in conjunction with the drawings and specific embodiments, embodiment can not repeat one by one at this, but therefore embodiment of the present utility model is not defined in following examples.
embodiment 1
As shown in Figures 1 and 2, the ultra-high performance concrete cover plate that a kind of angle steel is optimized, cover plate is of a size of 1400mm × 500mm × 80mm, comprise ultra-high performance concrete layer 3, the cage of reinforcement being parallel to cover plate lower surface is provided with in described ultra-high performance concrete layer 3, described cage of reinforcement is apart from cover plate lower surface 10mm, described cage of reinforcement welds primarily of longitudinal principal rod 1 of setting and the distribution bar 2 of horizontally set or ties up and forms, described distribution bar 2 is positioned at above principal rod 1, the top of described cage of reinforcement is welded with the some angle steel 4 be parallel to each other closely, the length direction of described angle steel 4 is consistent with the length direction of principal rod 1, described angle steel 4 is 15mm apart from the distance of cover plate top and four sides.
In the present embodiment, cage of reinforcement in described cover plate internal construction adopt diameter be the PC rod iron of 10.7mm as principal rod 1, diameter be the HPB300 reinforcing bar of 8mm as distribution bar 2, the tensile strength of described PC rod iron is 1400MPa.
In the present embodiment, described angle steel 4 is hot rolling equal angle steel, is of a size of 50mm × 50mm × 5mm, and during welding, the drift angle of described angle steel 4 upward.
In the present embodiment, the compressive strength of described ultra-high performance concrete is 143.5MPa.
The present embodiment is buried to build by angle steel and cage of reinforcement and forms in ultra-high performance concrete.Described cage of reinforcement is the individual layer rack being parallel to the setting of cover plate lower surface, and cage of reinforcement is made up of distribution bar and principal rod, and distribution bar 2 is near cover plate upper surface, and principal rod 1 is near cover plate lower surface.One deck that described angle steel 4 is arranged for being parallel to cover plate upper surface, angle steel fits tightly by welding with cage of reinforcement in cage of reinforcement upper end, and angle steel is positioned at the position apart from cover plate upper surface 15mm, and the thickness of this 15mm is thickness of concrete cover; Cover plate remainder is fully filled by ultra-high performance concrete.
Ultra-high performance concrete cover plate optimized by angle steel described in the present embodiment, and actual measurement cracking load is 139.2kN, and rupture load is 284.5kN, and method of testing is with reference to CHINA SOUTHERN POWER " cable channel cover plate standard technique bidding documents ".
In the contrast experiment carried out under the double-deck arrangement of reinforcement system of not carrying out angle steel replacement, actual measurement cracking load 117.6kN, rupture load is 232.6kN.
Can be reached a conclusion by above-mentioned experimental data: the ultra-high performance concrete cover plate carrying out angle steel optimization can improve the ultimate bearing capacity of cover plate really, also improves to the cracking resistance of cover plate.Concrete increase rate is that cracking load improves 18%, and rupture load improves 22%.
embodiment 2:
As shown in Figure 3 and Figure 4, the difference of the present embodiment and embodiment 1 is: described angle steel 4 is hot rolling unequal angle, and be of a size of 63mm × 40mm × 5mm, during welding, the long limb of described angle steel 4 welds with bottom layer of the reinforcing steel mesh sheet.
The ultra-high performance concrete of the present embodiment adopts optimizing mixing proporiton to be prepared from, and actual measurement compression strength value is 147.5MPa.
The present embodiment actual measurement cover plate cracking load is 142.4kN, and rupture load is 294.5kN, and method of testing is with reference to CHINA SOUTHERN POWER " cable channel cover plate standard technique bidding documents ".Compared with not carrying out the ultra-high performance concrete cover plate of angle steel optimization in embodiment 1, cracking load improves 21%, and rupture load improves 27%.
embodiment 3
A preparation method for the ultra-high performance concrete cover plate that angle steel as described in Example 1 is optimized, comprises step:
1) according to the modes of emplacement of the size of cover plate, protective layer thickness and angle steel, screwing steel bars skeleton, select suitable angle steel 4 specification, the present embodiment cover plate is of a size of 1400mm × 500mm × 80mm, and hot rolling equal angle steel selected by angle steel 4, is of a size of 50mm × 50mm × 5mm, cage of reinforcement is the individual layer rack being parallel to the setting of cover plate lower surface, cage of reinforcement is made up of distribution bar 2 and principal rod 1, and distribution bar 2 is near cover plate upper surface, and principal rod 1 is near cover plate lower surface;
2) angle steel 4 and cage of reinforcement are welded and fixed, make upper strata angle steel be parallel to bottom layer of the reinforcing steel skeleton, and make both fit tightly, during welding, the drift angle of described angle steel 4 upward;
3) hang in mould cavity by the angle steel 4 welded with cage of reinforcement, angle steel 4 near mould lower surface, and makes angle steel 4 and cage of reinforcement reserve the protective layer thickness of 15mm with upper and lower end face and each side;
4) ultra-high performance concrete mixed is toppled over injection mould cavity vibration 60 seconds, shaping rear floating cover plate external surface, angle steel 4 and cage of reinforcement are controlled in cover plate inside and reserve satisfactory protective layer thickness, cementitious material described in ultra-high performance concrete, sand, steel fibre, water, water reducing agent mix, stir, stirring system, for first to add sand and steel fibre, stirs 3 minutes; Add cementitious material again, stir 3 minutes; Finally add water and water reducing agent, stir 8 minutes;
5) cover plate is sent into stream curing together with mould indoor, environment temperature remains 40 DEG C of maintenances 24 hours, takes out form removal afterwards and under 85 DEG C of conditions, continues maintenance 48 hours again, obtain the ultra-high performance concrete cover plate that angle steel is optimized.
In sum, ultra-high performance concrete cover plate optimized by angle steel of the present utility model, the advantage of angle steel and reinforcing bar is combined togather, both the feature that angle steel resistance to deformation is strong and bearing capacity is high had been given full play to, also retain the effect that bottom layer of the reinforcing steel improves cover plate cracking resistance and bearing capacity, on the basis of double steel bar arrangement of reinforcement system, the supporting capacity of cover plate can be improved further.
The above; be only the utility model patent preferred embodiment; but the protection domain of the utility model patent is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in the utility model patent; be equal to according to the technical scheme of the utility model patent and utility model design thereof and replaced or change, all belonged to the protection domain of the utility model patent.
Claims (7)
1. the ultra-high performance concrete cover plate of an angle steel optimization, comprise ultra-high performance concrete layer (3), it is characterized in that: in described ultra-high performance concrete layer (3), be provided with the cage of reinforcement being parallel to cover plate lower surface, described cage of reinforcement is apart from cover plate lower surface 10 ~ 20mm, described cage of reinforcement welds primarily of longitudinal principal rod (1) of setting and the distribution bar (2) of horizontally set or ties up and forms, described distribution bar (2) is positioned at principal rod (1) top, the top of described cage of reinforcement is welded with the some angle steel (4) be parallel to each other closely, the length direction of described angle steel (4) is consistent with the length direction of principal rod (1), the distance of described angle steel (4) distance cover plate top and four sides is 10 ~ 20mm.
2. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, is characterized in that: described principal rod (1) diameter is 6 ~ 20mm, and principal rod (1) diameter 2mm more than larger than distribution bar (2).
3. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, is characterized in that: described principal rod (1) and distribution bar (2) adopt hot-rolled reinforced bar, hard drawn wire reinforcement or PC rod iron.
4. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, it is characterized in that: described angle steel (4) is hot rolling equal angle steel, during welding, the drift angle of described angle steel (4) upward.
5. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, it is characterized in that: described angle steel (4) is hot rolling unequal angle, during welding, a limit of described angle steel (4) is horizontally disposed with.
6. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, is characterized in that: the thickness of the ultra-high performance concrete cover plate of described angle steel optimization is more than or equal to 80mm.
7. the ultra-high performance concrete cover plate of angle steel optimization according to claim 1, is characterized in that: the compressive strength of described ultra-high performance concrete is more than or equal to 140MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520323558.3U CN204645396U (en) | 2015-05-19 | 2015-05-19 | The ultra-high performance concrete cover plate that a kind of angle steel is optimized |
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| CN201520323558.3U CN204645396U (en) | 2015-05-19 | 2015-05-19 | The ultra-high performance concrete cover plate that a kind of angle steel is optimized |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878876A (en) * | 2015-05-19 | 2015-09-02 | 华南理工大学 | Ultra-high performance concrete cover plate with optimized steel angles and production method of ultra-high performance concrete cover plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878876A (en) * | 2015-05-19 | 2015-09-02 | 华南理工大学 | Ultra-high performance concrete cover plate with optimized steel angles and production method of ultra-high performance concrete cover plate |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20180519 |