CN108130855B - Bridge prestressed concrete structure with protective structure and setting method - Google Patents
Bridge prestressed concrete structure with protective structure and setting method Download PDFInfo
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- CN108130855B CN108130855B CN201810073183.8A CN201810073183A CN108130855B CN 108130855 B CN108130855 B CN 108130855B CN 201810073183 A CN201810073183 A CN 201810073183A CN 108130855 B CN108130855 B CN 108130855B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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Abstract
The invention discloses a bridge prestressed concrete structure with a preventive protection structure, which comprises a prestressed concrete structure and the preventive protection structure; the prestressed concrete structure is internally provided with prestressed thick steel bars, and two ends of each prestressed thick steel bar are fixed in the prestressed concrete structure through anchor heads; the protective structure is fixedly connected to the outer surface of the prestressed concrete structure at the anchor head; the prevention protection structure comprises a flexible protection plate and fiber cloth which are sequentially arranged in the direction away from the outer surface of the prestressed concrete structure. The invention also discloses a setting method of the preventive guard structure. The invention carries out composite protection in a mode of 'flexible protection plates and fiber cloth', can effectively dissipate the huge impact after the prestressed reinforcement is broken, and ensures that the broken prestressed reinforcement does not puncture the protection structure, thereby avoiding the safety accidents of casualties or property loss caused by the ejection of the prestressed reinforcement and broken concrete out of the prestressed concrete structure.
Description
Technical Field
The invention relates to the technical field of bridge construction, maintenance and reinforcement, in particular to a bridge prestressed concrete structure with a protective structure and a protective structure setting method.
Background
In bridge engineering, the prestressed finish rolling screw thread thick steel bar is commonly applied to prestressed concrete structures, such as stay cable anchoring areas of cable-stayed bridge cable towers, prestressed concrete box girder webs and other structural parts. After the bridge structure is put into operation, the damage and the phenomenon that the finish rolling twisted steel is accidentally brittle and broken out occur sometimes, and the brittle breaking time cannot be predicted.
In order to apply a prestressing effect to a concrete structure, the finish rolling screw thread coarse reinforcement needs to be pre-stressed at a high level during construction, has larger initial tension and has large elastic potential energy in a normal working state. Brittle failure of the prestressed reinforcement is less in the construction process, often occurs in a period after the bridge is built, and delayed sudden time-lapse brittle failure occurs after the material corrosion, defect development or structural stress, deformation and other adverse factors of the prestressed reinforcement are mutually overlapped. Once the prestressed reinforcement is brittle, huge elastic potential energy is instantaneously converted into kinetic energy, the broken reinforcement breaks the anchoring concrete, the broken reinforcement and the broken concrete are shot from a concrete structure with the height of tens of meters or hundreds of meters to fall down, and serious safety threat and risk are formed on trains, vehicles, pedestrians, under-bridge passing ships and the like passing through the bridge deck, so that serious property loss or casualties are easily caused, and the negative influence is huge.
Compared with the steel strand prestressed reinforcement or common reinforcement, the prestressed finish rolling screw thread thick reinforcement is easy to generate brittle failure due to complex reasons, and the main reasons are as follows:
(1) The prestressed reinforcement has microscopic initial defects in the process of processing and forming, abnormal metallographic structure (more pearlite content), internal microscopic defects formed in the rolling process, inclusion in metal and the like;
(2) The yield ratio of the prestressed reinforcement is about 0.9, the yield ratio of the material is too high, the ductility is low, and brittle fracture is easy to cause in a high-stress state;
(3) The design working stress level of the prestressed reinforcement is higher, and the reserved safety margin is smaller. The design standard value of the yield strength of the high-strength prestressed coarse reinforced bar is 930MPa, the proportion of the design tension control stress to the standard value of the yield strength is as high as 0.85-0.90 under the general condition, and the reserved strength is smaller;
(4) In the construction process, poor construction quality is caused in links such as transportation, tensioning, filling and the like, so that the prestressed thick steel bars are damaged by collision, overstretched, corroded by stress and the like;
(5) The prestressed reinforcement is made of brittle materials and is in a tension state in a design state. The bridge structure is stressed and deformed in the actual working process, so that the internal prestressed finish rolling deformed bar is possibly in a bending or shearing adverse stress state.
Therefore, the brittle failure of the prestressed finish-rolled deformed bar is mainly related to factors such as raw material manufacturing process, use condition, construction quality and the like, and the reasons are complex, so that the risk of brittle failure is difficult to thoroughly avoid under the current technical conditions.
Because the brittle failure of the prestressed reinforcement is complicated, the events in the actual bridge engineering occur sometimes, the occurrence time and the occurrence quantity are often uncontrollable and predictable, potential safety hazards are left for bridge traffic safety along with the building of the bridge, and huge safety protection pressure is brought to the management and maintenance units.
Some bridges adopting the prestressed concrete structure are provided with a bracket and a safety protection net which are parallel to the bridge deck above the bridge deck, and the bracket and the safety protection net are used for shielding prestressed thick steel bars and broken concrete which are ejected and dropped after brittle failure above the bridge tower, so that traffic vehicles and pedestrians are prevented from being injured. The bridge is a passive protective measure, has high manufacturing cost, greatly changes the appearance of the bridge, and causes strong inhibition to the past personnel and bad social influence.
At present, no experimental study is carried out on the active pre-protection measures of the brittle failure of the pre-stress reinforcement in the pre-stress concrete structure at home, and no related published technical data or literature data are available, and the pre-stress reinforcement is basically in a blank state.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the bridge prestressed concrete structure with the protection structure, which can effectively dissipate energy of huge impact after the brittle prestressed reinforcement is broken by adopting a flexible protection plate and fiber cloth mode to realize the composite protection, so that the brittle prestressed reinforcement does not puncture the protection structure, and further, the safety accidents that the prestressed reinforcement and the broken concrete are shot out of the prestressed concrete structure to cause casualties or property loss are avoided.
In order to achieve the above purpose, the invention adopts the following technical scheme: bridge prestressed concrete structure with a preventive care structure, comprising:
the prestressed concrete structure is internally provided with prestressed thick steel bars, and two ends of each prestressed thick steel bar are fixed in the prestressed concrete structure through anchor heads;
the protective structure is fixedly connected to the outer surface of the prestressed concrete structure at the anchor head; the protective structure comprises a flexible protection plate and fiber cloth which are sequentially arranged in the direction away from the outer surface of the prestressed concrete structure.
Further, the flexible protection plate adopts a glass fiber plate, an aramid fiber plate or an aluminum alloy plate.
Further, the thickness of the flexible protection plate is 2 mm-3 mm.
Further, the fiber cloth is glass fiber cloth or aramid fiber cloth.
Further, the surface of the fiber cloth is coated with a protective coating.
The invention also provides a method for arranging the pre-protection structure in the bridge pre-stress concrete structure, wherein pre-stress thick steel bars are arranged in the pre-stress concrete structure, and two ends of the pre-stress thick steel bars are fixed in the pre-stress concrete structure through anchor heads; the protective structure is fixedly connected to the outer surface of the prestressed concrete structure at the anchor head; the protective structure comprises a flexible protection plate and fiber cloth which are sequentially arranged in a direction away from the outer surface of the prestressed concrete structure;
the method comprises the following steps:
s1: polishing and cleaning the outer surface of the prestressed concrete structure at the anchor head and keeping the outer surface dry;
s2: coating structural adhesive on the outer surface of the prestressed concrete structure at the anchor head, and pasting the flexible protection plate at the structural adhesive;
s3: and sticking the fiber cloth on the surface of the flexible protection plate, and sticking the edge of the fiber cloth on the outer surface of the prestressed concrete structure.
Further, in step S3, before the fiber cloth is adhered, the step of immersing the fiber cloth in an adhesive is further included.
Further, the method further comprises the step S4: and coating a protective coating on the surface of the fiber cloth.
Further, in the anchor head covered by the flexible protection plate, the distance between the central axis of the anchor head closest to the edge of the flexible protection plate and the edge of the flexible protection plate is not smaller than 0.3m.
Further, the distance between the edge of the fiber cloth and the edge of the flexible protection plate is not less than 0.5m.
Compared with the prior art, the invention has the advantages that:
(1) The protection effect is better. According to the invention, the flexible protection plate and the fiber cloth adhered on the surface of the concrete structure form a composite protection material, so that the brittle failure impact of the prestressed reinforcement is pre-protected. Experiments prove that after the prestressed reinforcement is broken, the prestressed reinforcement only partially empties the bonding surface between the composite protective material and the concrete, and the prestressed reinforcement does not break through the composite protective material, so that the protective effect is good. The flexible protection plate and the fiber cloth are used for compound protection, so that huge impact after brittle fracture of the prestressed reinforcement can be effectively dissipated, and the brittle broken prestressed reinforcement does not puncture a protection material, thereby avoiding safety accidents of the concrete structure, casualties or property loss caused by the ejection of the prestressed reinforcement and broken concrete.
(2) Compared with carbon fiber materials commonly used in bridge engineering, the glass fiber and aramid fiber materials have better ductility and better power impact resistance. After the carbon fiber material is dipped and glued, the brittleness is strong, and experiments prove that the surface of the carbon fiber material is poor in protection effect of carbon fiber cloth or carbon fiber plates with the same thickness, and the large impact force of the prestressed reinforcement cannot be resisted. The flexible protection plate has the advantages of low volume weight, light weight, good durability, corrosion resistance and good ageing resistance. The density of the aramid fiber is only 1/5 of that of the steel, and the density of the glass fiber and the aluminum alloy is only 1/3 of that of the steel. Compared with steel, the aramid fiber, the glass fiber and the aluminum alloy have better acid and alkali corrosion resistance; the protective coating is arranged on the outermost layer of the protective structure, so that the protective structure has good ageing resistance to ultraviolet rays and long service life. In the long-term operation process of the bridge, the invention can avoid protection and maintenance.
(3) And is convenient for construction. Compared with a steel plate, the aramid fiber board, the glass fiber board and the aluminum alloy plate adopted by the flexible protection plate have light weight and small out-of-plane rigidity, can be cut or processed according to the surface size of the structure, can be well adapted to and attached to the shape of the surface of the concrete structure, and is convenient for construction. Compared with a steel plate, the flexible protection plate and the concrete are firmly bonded; the steel plate has smooth surface, poor bonding effect with concrete and large weight. If the steel plate is used as a protective material, the adhesion force between the steel plate and the concrete is poor and the adhesion reliability is low, and the steel plate is required to be anchored in a manner similar to the conventional bridge reinforcement engineering process, namely, in a manner of planting bars or anchor bolts and grouting. The embedded bars or the anchor bolts need to be drilled on the concrete structure, so that the concrete structure is damaged, and the internal prestressed reinforcement bars are also likely to be damaged, so that the structure is additionally damaged.
(4) The appearance of the original structure is less changed. The minimum thickness of the aramid fiber board, the glass fiber board and the aluminum alloy plate adopted by the invention is only 2 mm-3 mm, the protection requirement can be met, the total thickness of the whole protection structure is about 5 mm-6 mm, the flexible protection plate can be well attached to the surface of the concrete structure, and the change of the structural appearance of the existing structure is very small; the color appearance can be adjusted by the surface protective coating, so that the color appearance is adapted to the integral color of the existing structure. Therefore, the appearance of the bridge concrete structure is less changed by the protective structure. If the steel plate is used for protection, the thickness of the steel plate is more than 6mm from the viewpoints of protection effect, corrosion resistance and the like, and the thickness of nuts and washers of anchor bolts or planted bars used for anchoring is more than 10mm protruding on the surface of the steel plate, so that the structure is in an uneven structure; the total thickness of the steel plate protection system is more than 16mm, and the structural appearance of the original structure to be protected is obviously changed.
(5) Good economical efficiency and low comprehensive cost. The protective material of the invention is a common material in the field of bridge engineering reinforcement. Wherein the raw material price of the glass fiber cloth (E type alkali-free) is lower, and the market price is 1/10 of that of the carbon fiber cloth; the unit price of the aluminum alloy plate and the glass fiber plate with the same thickness is close to that of the glass fiber plate; the unit price of the aramid fiber board is slightly more expensive, but the material consumption required for realizing the same protective effect is also the lowest because the impact strength and toughness of the aramid fiber material are the highest. Compared with the common technology of pasting steel plates in bridge reinforcement engineering, the flexible composite protective structure of the flexible protection plate and the fiber cloth has simpler construction technology and lower comprehensive cost.
In combination with the actual engineering requirement, the invention is verified by a plurality of rounds of experiments, and the test results show that: the protective structure has the advantages of good protective effect, optimal cost performance, small change of appearance of the bridge concrete structure and simple construction.
Drawings
Fig. 1 is a schematic cross-sectional structural view of a prestressed concrete structure of a bridge with a protective structure according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of FIG. 1 at A;
fig. 3 is a schematic plan view of a prestressed concrete structure of a bridge with a protective structure according to an embodiment of the present invention.
In the figure: 1. a prestressed concrete structure; 10. prestressed thick steel bars; 11. an anchor head; 2. a protective structure; 20. a flexible protection plate; 21. a fiber cloth.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, the bridge prestressed concrete structure with a guard structure according to an embodiment of the present invention includes a prestressed concrete structure 1 and a guard structure 2; the prestressed concrete structure 1 is internally provided with prestressed thick steel bars 10, and two ends of each prestressed thick steel bar 10 are fixed in the prestressed concrete structure 1 through anchor heads 11; the protective structure 2 is fixedly connected to the outer surface of the prestressed concrete structure 1 at the anchor head 11; the preventive care structure 2 comprises a flexible protection plate 20 and a fiber cloth 21 which are sequentially arranged towards the direction away from the outer surface of the prestressed concrete structure 1.
According to actual construction needs, the flexible protection plate 20 and the fiber cloth 21 can be provided with multiple layers, the total thickness of the whole protection structure 2 can be controlled to be about 5 mm-6 mm, and the flexible protection plate 20 can be well attached to the outer surface of the prestressed concrete structure 1, so that the change of the structural appearance of the existing structure is very small.
The flexible protection board 20 functions in that: the self impact toughness, strength and bonding force between the self impact toughness and the prestressed concrete structure 1 are utilized to form a first defense line, so that huge impact energy generated after the prestressed reinforcement 10 is brittle broken is consumed and absorbed, and the outer layer fiber cloth 21 adhered to the surface of the flexible protection plate 20 is prevented from being ejected and pierced by the prestressed reinforcement 10; the flexible protection plate 20 is made of a glass fiber board, an aramid fiber board or an aluminum alloy plate; the thickness is 2 nm-3 mm.
The fiber cloth 21 functions in: the flexible protection plate 20 is tightly wrapped with the prestressed concrete structure 1, and a second defense line is formed by utilizing the impact toughness and strength of the fiber cloth 21 and the bonding force between the flexible protection plate and the prestressed concrete structure 1, so that the residual impact energy of the prestressed reinforcement 10 is absorbed for the second time. When the flexible protection plate 20 is impacted by the prestressed reinforcement 10 and is torn off from the bonding surface between the prestressed reinforcement 10 and the prestressed concrete structure 1, the fiber cloth 21 is used for covering the flexible protection plate 20 which is detached and absorbing the residual impact energy of the prestressed reinforcement 10, and the flexible protection plate 20 is used for limiting the ejection displacement of the reinforcement within 6cm, so that the prestressed reinforcement 10 is prevented from being ejected from the prestressed concrete structure 1, and the reinforced anchoring concrete which is broken by the impact of the prestressed reinforcement 10 is prevented from falling from the high altitude. The fiber cloth 21 is a glass fiber cloth or an aramid fiber cloth,
the surface of the fiber cloth 21 can be further coated with a protective coating, and the protective coating has the following functions: the ultraviolet-resistant and aging-resistant protection is carried out on the protective materials such as the fiber cloth 21, the flexible protection plate 20 and the like, so that the normal service life of the protective materials can be effectively prolonged. The protective coating can be made of paint and other materials.
Referring to fig. 3, the flexible shield 20 covers at least one anchor head 11 during construction. The area covered by the flexible protection plate 21 is ensured to be larger, and the formed protection area is larger.
The invention also provides a method for arranging the pre-protection structure in the bridge pre-stress concrete structure, wherein the pre-stress thick steel bars 10 are arranged in the pre-stress concrete structure 1, and the two ends of the pre-stress thick steel bars 10 are fixed in the pre-stress concrete structure 1 through anchor heads 11; the protective structure 2 is fixedly connected to the outer surface of the prestressed concrete structure 1 at the anchor head 11; the protective structure 2 comprises a flexible protection plate 20 and a fiber cloth 21 which are sequentially arranged in a direction away from the outer surface of the prestressed concrete structure 1;
the method comprises the following steps:
s1: polishing and cleaning the outer surface of the prestressed concrete structure 1 at the anchor head 11 and keeping dry;
s2: coating structural adhesive on the outer surface of the prestressed concrete structure 1 at the anchor head 11, and sticking a flexible protection plate 20 at the structural adhesive;
s3: and sticking fiber cloth 21 on the surface of the flexible protection plate 20, wherein the edge of the fiber cloth 21 is stuck to the outer surface of the prestressed concrete structure 1.
Wherein, before pasting the fiber cloth 21 in step S3, the method further comprises the step of immersing the fiber cloth 21 in an adhesive;
after the construction of step S3 is completed, the method further includes step S4: a protective coating is applied to the surface of the fiber cloth 21.
In the step S4, before the protective coating is coated, the step of curing and curing the adhesive is further included; the curing time is generally 1 to 2 days, and the curing can be natural drying curing or manual heating curing.
The structural adhesive has the functions that: leveling the outer surface of the prestressed concrete structure 1 to be protected, and firmly adhering the flexible protection plate 20 to the outer surface of the prestressed concrete structure 1;
the adhesive has the following functions: firmly adhering fiber cloth 21 to the outer surfaces of the flexible protection plate 20 and the prestressed concrete structure 1; the fiber cloth 21 is impregnated with the adhesive, and can be sufficiently mixed so that the fiber cloth is more compact when attached, does not generate cavitation, and is more compact when attached.
Referring to fig. 3, the center axis of the anchor head 11 closest to the edge of the flexible protection plate 20 among the anchor heads 11 covered by the flexible protection plate 20 is not less than 0.3m from the edge of the flexible protection plate 20.
Referring to fig. 3, the edge of the fiber cloth 21 is not less than 0.5m beyond the edge of the flexible protection board 20.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. Bridge prestressed concrete structure with prevention protection structure, its characterized in that includes:
the prestressed concrete structure (1), wherein a prestressed thick steel bar (10) is arranged in the prestressed concrete structure (1), and two ends of the prestressed thick steel bar (10) are fixed in the prestressed concrete structure (1) through anchor heads (11);
a prevention protection structure (2), wherein the prevention protection structure (2) is fixedly connected to the outer surface of the prestressed concrete structure (1) at the anchor head (11); the protective structure (2) comprises a flexible protection plate (20) and fiber cloth (21) which are sequentially arranged in the direction away from the outer surface of the prestressed concrete structure (1).
2. The bridge prestressed concrete structure of claim 1, wherein: the flexible protection plate (20) is made of a glass fiber board, an aramid fiber board or an aluminum alloy plate.
3. The bridge prestressed concrete structure of claim 1, wherein: the thickness of the flexible protection plate (20) is 2-3 mm.
4. The bridge prestressed concrete structure of claim 1, wherein: the fiber cloth (21) is made of glass fiber cloth or aramid fiber cloth.
5. The bridge prestressed concrete structure of claim 1, wherein: the surface of the fiber cloth (21) is coated with a protective coating.
6. The method for arranging the pre-protection structure in the bridge pre-stress concrete structure is characterized in that a pre-stress thick steel bar (10) is arranged in the pre-stress concrete structure (1), and two ends of the pre-stress thick steel bar (10) are fixed in the pre-stress concrete structure (1) through anchor heads (11); the protective structure (2) is fixedly connected to the outer surface of the prestressed concrete structure (1) at the anchor head (11); the protective structure (2) comprises a flexible protection plate (20) and fiber cloth (21) which are sequentially arranged in the direction away from the outer surface of the prestressed concrete structure (1);
the method comprises the following steps:
s1: polishing, cleaning the outer surface of the prestressed concrete structure (1) at the anchor head (11) and keeping dry;
s2: coating structural adhesive on the outer surface of the prestressed concrete structure (1) at the anchor head (11), and pasting the flexible protection plate (20) at the structural adhesive;
s3: and pasting the fiber cloth (21) on the surface of the flexible protection plate (20), wherein the edge of the fiber cloth (21) is pasted on the outer surface of the prestressed concrete structure (1).
7. The method of claim 6, wherein: in step S3, before the fiber cloth (21) is adhered, the method further includes a step of immersing the fiber cloth (21) in an adhesive.
8. The method of claim 6, further comprising step S4: and coating a protective coating on the surface of the fiber cloth (21).
9. The method of claim 6, wherein: in the anchor head (11) covered by the flexible protection plate (20), the distance between the central axis of the anchor head (11) closest to the edge of the flexible protection plate (21) and the edge of the flexible protection plate (21) is not smaller than 0.3m.
10. The method of claim 6, wherein: the distance between the edge of the fiber cloth (21) and the edge of the flexible protection plate (20) is not less than 0.5m.
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| CN201810073183.8A CN108130855B (en) | 2018-01-25 | 2018-01-25 | Bridge prestressed concrete structure with protective structure and setting method |
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| CN108130855B true CN108130855B (en) | 2023-05-02 |
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| CN202081661U (en) * | 2011-05-05 | 2011-12-21 | 中建新疆建工集团第二建筑工程有限公司 | Safety protection device for prestressed tensioning anchoring end |
| JP2014020072A (en) * | 2012-07-17 | 2014-02-03 | Taisei Corp | Demolition method for pre-stressed concrete beam |
| CN205713204U (en) * | 2015-12-31 | 2016-11-23 | 上海建工七建集团有限公司 | A kind of girder pre-stressed release preventer |
| CN208023394U (en) * | 2018-01-25 | 2018-10-30 | 中铁大桥科学研究院有限公司 | Bridge prestress concrete structure with pre- safeguard structure |
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2018
- 2018-01-25 CN CN201810073183.8A patent/CN108130855B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101748414A (en) * | 2008-12-17 | 2010-06-23 | 中国科学院金属研究所 | Protection method of prestressed concrete post-tensioning steel strand anchorage |
| KR101081502B1 (en) * | 2010-11-30 | 2011-11-09 | 추태헌 | Psc girder manufacturing method using end-mold with anchor plate and bridge construction method using the psc girder |
| CN202081661U (en) * | 2011-05-05 | 2011-12-21 | 中建新疆建工集团第二建筑工程有限公司 | Safety protection device for prestressed tensioning anchoring end |
| JP2014020072A (en) * | 2012-07-17 | 2014-02-03 | Taisei Corp | Demolition method for pre-stressed concrete beam |
| CN205713204U (en) * | 2015-12-31 | 2016-11-23 | 上海建工七建集团有限公司 | A kind of girder pre-stressed release preventer |
| CN208023394U (en) * | 2018-01-25 | 2018-10-30 | 中铁大桥科学研究院有限公司 | Bridge prestress concrete structure with pre- safeguard structure |
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