CN104878874A - Pier head reinforced ultra-high performance concrete cover plate and production method thereof - Google Patents

Pier head reinforced ultra-high performance concrete cover plate and production method thereof Download PDF

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Publication number
CN104878874A
CN104878874A CN201510255612.XA CN201510255612A CN104878874A CN 104878874 A CN104878874 A CN 104878874A CN 201510255612 A CN201510255612 A CN 201510255612A CN 104878874 A CN104878874 A CN 104878874A
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CN
China
Prior art keywords
cover plate
ultra
performance concrete
pier nose
pier
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CN201510255612.XA
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Chinese (zh)
Inventor
杨医博
潘文智
黄鸿浩
郭文瑛
冼剑华
蔡铉烨
王恒昌
谭颖垚
郭振海
廖芮
刘金涛
谭志健
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华南理工大学
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Priority to CN201510255612.XA priority Critical patent/CN104878874A/en
Publication of CN104878874A publication Critical patent/CN104878874A/en

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Abstract

The invention discloses a pier head reinforced ultra-high performance concrete cover plate. The pier head reinforced ultra-high performance concrete cover plate comprises an ultra-high performance concrete layer, wherein a steel bar framework parallel to the lower end surface of a cover plate body is arranged at the position, which is far away from the lower end surface and four sides of the cover plate body by a distance of 10-20mm, in the ultra-high performance concrete layer; the steel bar framework comprises longitudinally arranged stress bars and horizontally arranged distribution bars; pier heads are arranged at two ends of each stress bar; the outer diameter of the pier heads is 1.3-2.0 times to the diameter of the stress bars. The invention also discloses a production method of the pier head reinforced ultra-high performance concrete cover plate. The pier head reinforced ultra-high performance concrete cover plate can be used for improving the sliding resistance between the steel bars and ultra-high performance concrete in the cover plate, delaying the occurrence of cracks of the cover plate, improving the crack load of the cover plate and improving the durability of cover plate products, and has a very good economic benefit.

Description

Ultra-high performance concrete cover plate that a kind of pier nose strengthens and preparation method thereof
Technical field
The invention belongs to building material field, be specifically related to ultra-high performance concrete cover plate of a kind of pier nose enhancing and preparation method thereof.
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.
Ultra-high performance concrete cover plate, relative to traditional concrete cover, its supporting capacity and endurance quality are all enhanced.But under accidental larger impact load or action of long-term load, cover plate still can more early ftracture, and causes the problem of inner reinforcement corrosion, and this causes very large adverse effect by the endurance quality of cover plate, greatly shortens the application life of cover plate.Although there is the way being improved cover plate cracking load by Shi Hanzhang at present, due to its complex procedures and construction cost high and be not widely adopted, the cracking therefore how postponing cover plate simply and effectively becomes the problem that is needed badly exploration.
Pier nose is added at the principal rod two ends of cage of reinforcement, be conducive to the adhesion stress between stiffener and ultra-high performance concrete and anchored force, and then improve the resistant slide ability of reinforcing bar, the appearance of delayed fracture, thus improve the cracking load of cover plate, efficiently solve the inside corrosion of reinforcing steel bar caused because of premature rupture bottom conventional cover plate, there is good economic benefit.
Summary of the invention
The object of the present invention is to provide ultra-high performance concrete cover plate that a kind of pier nose strengthens and preparation method thereof, adhesion stress between stiffener and ultra-high performance concrete and anchored force, and then improve the resistant slide ability of reinforcing bar, the appearance of delayed fracture, final cracking load and the endurance quality improving cover plate.
For achieving the above object, the present invention can take following technical scheme:
The ultra-high performance concrete cover plate that a kind of pier nose strengthens, comprise ultra-high performance concrete layer, in described ultra-high performance concrete layer, the position of distance cover plate lower surface 10 ~ 20mm, distance cover plate four side 10 ~ 20mm is provided with the cage of reinforcement being parallel to cover plate lower surface, described cage of reinforcement comprises the longitudinally principal rod of setting, the distribution bar of horizontally set, the two ends of described principal rod are provided with pier nose, and the external diameter of described pier nose is 1.3-2.0 times of principal rod diameter.
Further, described principal rod diameter is 6 ~ 20mm, principal rod diameter 2mm more than larger than distribution bar.
Further, described cage of reinforcement adopts hot-rolled reinforced bar, hard drawn wire reinforcement or PC rod iron.
Further, the compressive strength of described ultra-high performance concrete is more than or equal to 140MPa.
The present invention additionally provides the preparation method of the ultra-high performance concrete cover plate that a kind of pier nose strengthens on the other hand, comprises step:
1) according to the pattern of pier nose, pier nose is added at each principal rod two ends;
2) according to cover plate size and protective layer thickness screwing steel bars skeleton;
3) hang in mould cavity by cage of reinforcement, during placement, principal rod upward, and lower surface and four limits respectively reserve the protective layer thickness of 10 ~ 20mm;
4) ultra-high performance concrete mixed is toppled over injection mould cavity, floating cover plate external surface after vibration moulding;
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 pier nose strengthens.
Further, described step 5) specifically comprises: 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 pier nose strengthens.
Further, first by Cold header, principal rod two ends pier is thick when in described step 1), pier nose adds, and then utilize special purpose machine tool to carry out mantle fiber to the thick section of pier to form.
Described ultra-high performance concrete is all prepared from optimizing mixing proporiton, and compressive strength should lower than 140MPa;
The ultra-high performance concrete cover plate that pier nose provided by the invention strengthens, have the following advantages relative to prior art tool: the existence of principal rod two ends pier nose can adhesion stress between stiffener and ultra-high performance concrete and anchored force, and then improve the resistant slide ability of reinforcing bar, the appearance of delayed fracture, improve the cracking load of cover plate, thus improve the anti-cracking performance of cover plate and impervious outlet capacity, reduce the possibility of cage of reinforcement corrosion, the endurance quality of final raising cover plate, has good economic benefit.
The present invention will play a great role at building, power domain, have a extensive future.
Accompanying drawing explanation
Fig. 1 is the pier nose pattern schematic diagram of the embodiment of the present invention.
The arrangement of reinforcement schematic top plan view of Fig. 2 embodiment of the present invention.
Fig. 3 be in Fig. 2 A-A to cross-sectional schematic.
Fig. 4 be in Fig. 2 B-B to cross-sectional schematic.
Shown in figure be: 1-principal rod; 2-distribution bar; 3-ultra-high performance concrete layer; 4-bearing rod; 5-pier nose.
Detailed description of the invention
Be described in further detail object of the present invention below in conjunction with the drawings and specific embodiments, embodiment can not repeat one by one at this, but therefore embodiments of the present invention are not defined in following examples.
embodiment 1
As shown in Figures 1 to 4, the ultra-high performance concrete cover plate that a kind of pier nose strengthens, comprise ultra-high performance concrete layer 3, in described ultra-high performance concrete layer 3, the position of distance cover plate lower surface 10mm, distance cover plate four side 15mm is provided with the cage of reinforcement being parallel to cover plate lower surface, the cage of reinforcement of the present embodiment is double layer grid, comprise the longitudinally principal rod 1 of setting, the distribution bar 2 of horizontally set, bearing rod 4 connects two-layer rack and plays supporting upper strata rack.
In the present embodiment, described cover plate is of a size of 1400mm × 500mm × 80mm.
In the present embodiment, described principal rod 1 adopts diameter to be the PC rod iron of 10.7mm, and tensile strength values is 1400MPa, and distribution bar 2 and bearing rod 4 adopt diameter to be the HPB300 reinforcing bar of 8mm.
Described in the present embodiment, the two ends of principal rod 1 are provided with pier nose 5, and the external diameter of described pier nose 5 is 1.3 times of principal rod 1 diameter, i.e. 13.9mm.
Described in the present embodiment, ultra-high performance concrete actual measurement compressive strength is 152.6MPa.
The actual measurement cover plate cracking load of the present embodiment is 130.4kN, and rupture load is 240.8kN, and method of testing is with reference to CHINA SOUTHERN POWER " cable channel cover plate standard technique bidding documents ".
In the contrast experiment not carrying out pier nose enhancing, actual measurement cracking load 117.6kN, rupture load is 232.6kN.
With do not add compared with ultra-high performance concrete cover plate that pier nose strengthens, cracking load improves 11%, and rupture load improves 4%.
embodiment 2
The difference of the present embodiment and embodiment 1 is: the external diameter of described pier nose 5 is 2.0 times of principal rod 1 diameter, i.e. 21.4mm, and described ultra-high performance concrete actual measurement compressive strength is 154.6MPa;
The actual measurement cover plate cracking load of the present embodiment is 162.4kN, and rupture load is 258.5kN, and method of testing is with reference to CHINA SOUTHERN POWER " cable channel cover plate standard technique bidding documents ".
With do not add compared with ultra-high performance concrete cover plate that pier nose strengthens, cracking load improves 38%, and rupture load improves 11%.
embodiment 3
The ultra-high performance concrete cover plate preparation method that pier nose strengthens, comprises step:
1) according to the pattern of pier nose 5, pier nose 5 is added at each principal rod 1 two ends, first by Cold header, principal rod (1) two ends pier is thick when pier nose 5 adds, and then utilize special purpose machine tool to carry out mantle fiber to the thick section of pier to form; Described principal rod 1 adopts diameter to be the PC rod iron of 10.7mm, and tensile strength values is 1400MPa, and distribution bar 2 and bearing rod 4 adopt diameter to be the HPB300 reinforcing bar of 8mm; The external diameter of described pier nose 5 is 2.0 times of principal rod 1 diameter, i.e. 21.4mm;
2) described cover plate is of a size of 1400mm × 500mm × 50mm, lower protective layer thickness is 15mm, according to cover plate size and protective layer thickness screwing steel bars skeleton, 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, distribution bar 2 is near cover plate upper surface, and principal rod 1 is near cover plate lower surface;
3) hang in mould cavity by cage of reinforcement, during placement, principal rod (1) upward, and 15mm above the upper surface distance die cavity of principal rod, this 15mm space is thickness of concrete cover.Cage of reinforcement surrounding distance mould intracavity wall distance is 15mm, and this 15mm space is thickness of concrete cover;
4) ultra-high performance concrete mixed is toppled over injection mould cavity, vibrate 60 seconds shaping rear floating cover plate external surfaces, by cementitious material required in ultra-high performance concrete, sand, steel fibre, water, water reducing agent mixing during 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 pier nose strengthens.
The actual measurement of ultra-high performance concrete described in the present embodiment compressive strength is 148.8MPa.
The ultra-high performance concrete cover plate that pier nose described in the present embodiment strengthens, actual measurement cracking load is 44.8kN, and rupture load is 80.8kN, and method of testing is with reference to CHINA SOUTHERN POWER " cable channel cover plate standard technique bidding documents ".
In the contrast experiment not carrying out pier nose enhancing, actual measurement cracking load 32kN, rupture load is 72.8kN.
With do not add compared with ultra-high performance concrete cover plate that pier nose strengthens, cracking load improves 40%, and rupture load improves 11%.
In sum, the ultra-high performance concrete cover plate that pier nose of the present invention strengthens, principal rod two ends in the cage of reinforcement of cover plate add pier nose, be conducive to the adhesion stress between stiffener and ultra-high performance concrete and anchored force, and then improve the resistant slide ability of reinforcing bar, appearance also effective control critical eigenvalue width of delayed fracture, improve the cracking load of cover plate, thus improve the anti-cracking performance of cover plate and impervious outlet capacity, reduce the possibility of cage of reinforcement corrosion, finally greatly improve endurance quality and the application life of cover plate.
The above; be only patent preferred embodiment of the present invention; but the protection domain of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in patent of the present invention; be equal to according to the technical scheme of patent of the present invention and inventive concept thereof and replace or change, all belonged to the protection domain of patent of the present invention.

Claims (7)

1. the ultra-high performance concrete cover plate of a pier nose enhancing, comprise ultra-high performance concrete layer (3), the interior distance cover plate lower surface 10 ~ 20mm of described ultra-high performance concrete layer (3), the position of distance cover plate four side 10 ~ 20mm is provided with the cage of reinforcement being parallel to cover plate lower surface, described cage of reinforcement comprises the principal rod (1) longitudinally arranged, the distribution bar (2) of horizontally set, it is characterized in that: the two ends of described principal rod (1) are provided with pier nose (5), the external diameter of described pier nose (5) is 1.3-2.0 times of principal rod (1) diameter.
2. the ultra-high performance concrete cover plate of pier nose enhancing according to claim 1, is characterized in that: described principal rod (1) diameter is 6 ~ 20mm, principal rod (1) diameter 2mm more than larger than distribution bar.
3. the ultra-high performance concrete cover plate of pier nose enhancing according to claim 1, is characterized in that: described cage of reinforcement adopts hot-rolled reinforced bar, hard drawn wire reinforcement or PC rod iron.
4. the ultra-high performance concrete cover plate of pier nose enhancing according to claim 1, is characterized in that: the compressive strength of described ultra-high performance concrete is more than or equal to 140MPa.
5. a preparation method for the ultra-high performance concrete cover plate that the pier nose as described in any one of Claims 1-4 strengthens, is characterized in that, comprise step:
1) according to the pattern of pier nose, pier nose (5) is added at each principal rod (1) two ends;
2) according to cover plate size and protective layer thickness screwing steel bars skeleton;
3) hang in mould cavity by cage of reinforcement, during placement, principal rod (1) upward, and lower surface and four limits respectively reserve the protective layer thickness of 10 ~ 20mm;
4) ultra-high performance concrete mixed is toppled over injection mould cavity, floating cover plate external surface after vibration moulding;
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 pier nose strengthens.
6. preparation method according to claim 5, it is characterized in that, described step 5) specifically comprises: cover plate is carried out stream curing together with mould, environment temperature remains 40 DEG C of maintenances 24 hours, take out form removal afterwards and under 85 DEG C of conditions, continue maintenance 48 hours again, obtain the ultra-high performance concrete cover plate that pier nose strengthens.
7. preparation method according to claim 5, is characterized in that, first by Cold header, principal rod (1) two ends pier is thick when in described step 1), pier nose (5) adds, and then utilizes special purpose machine tool to carry out mantle fiber to the thick section of pier to form.
CN201510255612.XA 2015-05-19 2015-05-19 Pier head reinforced ultra-high performance concrete cover plate and production method thereof CN104878874A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11324214A (en) * 1998-05-18 1999-11-26 Taisei Corp Reinforced concrete material
CN201713933U (en) * 2010-03-29 2011-01-19 南京大地建设集团有限责任公司 Trench cover plate
CN202492858U (en) * 2012-01-10 2012-10-17 浙江省建工集团有限责任公司 Concrete wear-resistant cover plate
CN104153287A (en) * 2014-07-07 2014-11-19 上海应用技术学院 Segmental assembled concrete frame pier system with self-reset function and method
CN204645394U (en) * 2015-05-19 2015-09-16 华南理工大学 The ultra-high performance concrete cover plate that a kind of pier nose strengthens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11324214A (en) * 1998-05-18 1999-11-26 Taisei Corp Reinforced concrete material
CN201713933U (en) * 2010-03-29 2011-01-19 南京大地建设集团有限责任公司 Trench cover plate
CN202492858U (en) * 2012-01-10 2012-10-17 浙江省建工集团有限责任公司 Concrete wear-resistant cover plate
CN104153287A (en) * 2014-07-07 2014-11-19 上海应用技术学院 Segmental assembled concrete frame pier system with self-reset function and method
CN204645394U (en) * 2015-05-19 2015-09-16 华南理工大学 The ultra-high performance concrete cover plate that a kind of pier nose strengthens

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
文亚平: "《雪峰山特长隧道沟槽盖板塑钢模具施工技术》", 《铁道技术监督》 *
李云红: "《高速铁路桥隧工》", 31 July 2013 *

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Application publication date: 20150902