CN112936508A - Manufacturing method of laminated beam for reinforcing UHPC-NC interface bonding by adopting dentate structure - Google Patents
Manufacturing method of laminated beam for reinforcing UHPC-NC interface bonding by adopting dentate structure Download PDFInfo
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- CN112936508A CN112936508A CN201911270345.8A CN201911270345A CN112936508A CN 112936508 A CN112936508 A CN 112936508A CN 201911270345 A CN201911270345 A CN 201911270345A CN 112936508 A CN112936508 A CN 112936508A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
- B28B1/16—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted for producing layered articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/348—Moulds, cores, or mandrels of special material, e.g. destructible materials of plastic material or rubber
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Abstract
The invention belongs to the technical field of structural engineering, and particularly relates to a manufacturing method of a laminated beam for strengthening UHPC-NC interface bonding by adopting a dentate structure. A toothed structure is manufactured to strengthen the bonding between the interfaces of the lower UHPC (1) and the upper NC (2), the toothed structure is designed into an isosceles trapezoid, and a welding nail (3) is inserted into the center of the toothed structure. According to the invention, the tooth-shaped structure is manufactured between the UHPC-NC connecting interfaces, so that the bonding strength of the UHPC-NC interfaces is improved, the cooperativity and the integral stress performance of two materials of the UHPC-NC superposed beam are increased, and the excellent characteristics of the UHPC-NC superposed beam are fully exerted.
Description
Technical Field
The invention belongs to the technical field of structural engineering, and particularly relates to a superposed beam which adopts a dentate structure to strengthen UHPC-NC (Ultra-High Performance Concrete and Normal Concrete, namely Ultra-High Performance Concrete, for short UHPC and Normal Concrete, namely common Concrete, for short NC) interface bonding.
Background
Since the concrete structure is applied to the building field in China from the beginning of the last 20 th century of the 19 th century, the concrete structure is rapidly developed in various engineering constructions in China and is one of the most widely applied building structures. However, the concrete structure also has the defects of low tensile strength, easy occurrence of cracks, great self-weight and the like, and under the influence of various physical, chemical and human factors, the concrete structure is easy to have diseases such as exposed ribs, damage, cracking, deformation and the like, thereby bringing great harm to the safety and durability of the whole structure.
The ultra-high performance concrete, referred to as UHPC for short, has a long history since the proposal, and has made certain breakthrough and progress in the aspects of theoretical research and engineering application. UHPC becomes a research and application hotspot of the building material industry in a long time in the future due to the ultrahigh mechanical property, ultrahigh durability and excellent wear resistance and anti-explosion performance of the UHPC. However, because of the need to incorporate fiber and various admixtures to increase the strength thereof and the large amount of cement used, the price of UHPC is too expensive compared to that of general concrete. In order to reduce the configuration price and simultaneously give full play to the superior tensile property of UHPC and the stronger compressive property of NC, the advantages of the UHPC and the NC are complementary, and the UHPC and the NC can be overlapped in the technical field of structural engineering at present.
At present, effective bonding methods for strengthening the UHPC-NC interface mainly comprise modes of interface connection roughening, grooving and the like, the treatment modes also cannot ensure that the UHPC-NC interface has sufficient bonding strength, and when a UHPC-NC superposed beam bears a large load, the UHPC-NC interface is easy to shear and break.
Disclosure of Invention
The invention relates to a manufacturing method of a superposed beam for strengthening UHPC-NC interface bonding by adopting a dentate structure. When the UHPC-NC superposed beam is poured, trapezoidal foam is adopted, vertical templates are erected on two sides of the trapezoidal foam, welding nails are vertically inserted into the centers of the lower bottoms of the trapezoidal foam, the insertion depth is 3/4-4/5 of the height of the welding nails, and the whole prefabricated template is used. Firstly pouring UHPC with the beam height of 1/4-1/3, taking down trapezoidal foam when UHPC at the lower part is completely solidified, reserving welding nails and a vertical template, pouring NC at the upper part to form a superposed beam, and finally curing the UHPC-NC superposed beam. According to the invention, the tooth-shaped structure is adopted between the UHPC-NC connecting interfaces, so that the bonding strength of the UHPC-NC interfaces is improved, the cooperativity and the integral stress performance of two materials of the UHPC-NC superposed beam are facilitated, and the excellent characteristics of the UHPC-NC superposed beam are fully exerted. The problem of insufficient adhesion of the existing UHPC-NC interface is solved, and the mechanical property of the UHPC-NC superposed beam can be better researched.
In order to achieve the purpose, the invention adopts the following technical scheme: a manufacturing method of a laminated beam for reinforcing UHPC-NC interface bonding by adopting a tooth-shaped structure is used for manufacturing the tooth-shaped structure so as to reinforce the bonding between the UHPC and the NC interface. And inserting a welding nail at the interface, wherein the diameter of the welding nail is set to be 10-13 cm, the length of the welding nail is set to be 1/2-3/4 of the height of the beam, and the thickness of the concrete protective layer between the transverse edge and the longitudinal edge of the welding nail and the edge of the beam is not less than 5 cm.
The manufacturing method of the laminated beam adopting the tooth-shaped structure to strengthen UHPC-NC interface bonding is characterized in that the tooth-shaped structure is designed into an isosceles trapezoid, the height of the tooth-shaped structure is set to be 1/4-1/3 of the beam height, the width of the upper bottom is set to be 1/12-1/10 of the beam width, the width of the lower bottom is set to be 1/6-1/5 of the beam width, and the number of the tooth-shaped structures is determined according to the beam width.
According to the manufacturing method of the laminated beam for reinforcing UHPC-NC interface bonding by adopting the tooth-shaped structure, the welding nails are vertically inserted into the center of the tooth-shaped structure, and the insertion depth is 3/4-4/5 of the height of the welding nails.
The manufacturing method of the superposed beam for reinforcing UHPC-NC interface bonding by adopting the dentate structure is characterized in that the horizontal distance of the longitudinal section of the welding nail is set to be 70-90 cm.
The manufacturing method of the laminated beam adopting the dentate structure to strengthen the UHPC-NC interface bonding is characterized in that the thickness of the UHPC at the lower part is set to be 1/4-1/3 of the height of the beam, and the thickness of the NC at the upper part is set to be 2/3-3/4 of the height of the beam.
The manufacturing method of the laminated beam adopting the dentate structure to strengthen the UHPC-NC interface bonding comprises the steps of adopting trapezoidal foam, erecting vertical templates on two sides of the trapezoidal foam, vertically inserting a welding nail in the center of the lower bottom of the trapezoidal foam, taking the trapezoidal foam as a prefabricated template as a whole, taking down the trapezoidal foam after the UHPC on the lower part is completely solidified, reserving the vertical templates and the welding nail, and continuously pouring the NC on the upper part.
According to the manufacturing method of the superposed beam for strengthening UHPC-NC interface bonding by adopting the dentate structure, the welding nails can be replaced by reinforcing steel bars.
A manufacturing method of a laminated beam for strengthening UHPC-NC interface bonding by adopting a dentate structure is characterized by comprising the following steps:
A. determining the number of tooth-shaped structures and the number of trapezoidal foams according to the size of the manufactured UHPC-NC superposed beam;
B. determining the number of welding nails according to the length and the number of the tooth-shaped structures of the manufactured UHPC-NC superposed beam;
C. erecting vertical templates on two sides of the trapezoidal foam, and vertically inserting a welding nail in the center of the lower bottom of the trapezoidal foam;
D. pouring UHPC with the beam height of 1/4-1/3;
E. and after the UHPC on the lower part is solidified and hardened, removing the foam, reserving the welding nails and the vertical template, pouring the NC on the upper part to form the superposed beam, and maintaining the UHPC-NC superposed beam.
The invention has the following beneficial effects:
the invention relates to a manufacturing method of a laminated beam for strengthening UHPC-NC interface bonding by adopting a dentate structure, the existing method for strengthening the effective bonding of the UHPC-NC interface mainly comprises modes of connecting interface roughening, grooving and the like, the treatment mode of the type can not ensure that the UHPC-NC interface has sufficient bonding strength, and a UHPC layer can generate cracks. When the UHPC-NC superposed beam bears a large load, the UHPC-NC interface is easy to generate shearing damage. The invention is a more effective bonding mode by manufacturing the dentate structure on the UHPC-NC interface, and does not damage the original concrete structure. Meanwhile, the welding nail is inserted into the tooth-shaped structure, so that the UHPC and NC laminated material has better cooperativity and integral stress performance. The problem of insufficient adhesion of the existing UHPC-NC interface is solved, and the mechanical property of the UHPC-NC superposed beam can be better researched.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional profile of a UHPC-NC composite beam cast using a toothed construction;
fig. 2 is a cross-sectional profile schematic of a UHPC-NC composite beam cast using a toothed construction.
In the drawings, 1 is UHPC; 2 is NC; and 3 is a welding nail.
Detailed Description
For a more complete understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
A manufacturing method of a laminated beam adopting a dentate structure to strengthen UHPC-NC interface bonding is characterized in that the dentate structure is manufactured to strengthen bonding between interfaces of UHPC1 and NC2, a welding nail 3 is inserted into the interface, the diameter of the welding nail 3 is set to be 10-13 cm, the length of the welding nail 3 is set to be 1/2-3/4 of the height of the beam, and the thickness of a concrete protective layer between the transverse edge and the longitudinal edge of the welding nail 3 and the edge of the beam is not less than 5 cm.
The manufacturing method of the laminated beam adopting the tooth-shaped structure to strengthen UHPC-NC interface bonding is characterized in that the tooth-shaped structure is designed into an isosceles trapezoid, the height of the tooth-shaped structure is set to be 1/4-1/3 of the beam height, the width of the upper bottom is set to be 1/12-1/10 of the beam width, the width of the lower bottom is set to be 1/6-1/5 of the beam width, and the number of the tooth-shaped structures is determined according to the beam width.
According to the manufacturing method of the laminated beam for reinforcing UHPC-NC interface bonding by adopting the tooth-shaped structure, the welding nails 3 are vertically inserted into the center of the tooth-shaped structure, and the insertion depth is 3/4-4/5 of the height of the welding nails 3.
According to the manufacturing method of the laminated beam for reinforcing UHPC-NC interface bonding by adopting the dentate structure, the horizontal distance of the longitudinal section of the welding nail 3 is set to be 70-90 cm.
The manufacturing method of the laminated beam adopting the dentate structure to strengthen the UHPC-NC interface bonding is characterized in that the thickness of the UHPC1 at the lower part is set to be 1/4-1/3 of the beam height, and the thickness of the NC2 at the upper part is set to be 2/3-3/4 of the beam height.
The laminated beam adopting the open-cell steel plate to reinforce UHPC-NC interface bonding adopts trapezoidal foam, vertical templates are erected on two sides of the trapezoidal foam, a welding nail 3 is vertically inserted into the center of the lower bottom of the trapezoidal foam, the integral beam is used as a prefabricated template, the trapezoidal foam is taken down after the UHPC1 on the lower part is completely solidified, the vertical templates and the welding nail 3 are reserved, and the NC2 on the upper part is continuously poured.
According to the manufacturing method of the superposed beam for strengthening UHPC-NC interface bonding by adopting the dentate structure, the welding nails can be replaced by materials such as steel bars.
The specific use mode of the laminated beam for strengthening UHPC-NC interface bonding by adopting the perforated steel plate comprises the following steps:
A. determining the number of tooth-shaped structures and the number of trapezoidal foams according to the size of the manufactured UHPC-NC superposed beam;
B. determining the number of welding nails according to the length and the number of the tooth-shaped structures of the manufactured UHPC-NC superposed beam;
C. erecting vertical templates on two sides of the trapezoidal foam, and vertically inserting a welding nail 3 in the center of the lower bottom of the trapezoidal foam;
D. pouring UHPC1 with the beam height of 1/4-1/3;
E. and after the UHPC1 on the lower part is solidified and hardened, removing foams, reserving the welding nails and the vertical template, pouring the NC2 on the upper part to form the superposed beam, and maintaining the UHPC-NC superposed beam.
Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The manufacturing method of the laminated beam for reinforcing UHPC-NC interface bonding by adopting the toothed structure is characterized in that the toothed structure is manufactured to reinforce the bonding between the UHPC (1) and the NC (2) interface, a welding nail (3) is inserted into the interface, the diameter of the welding nail (3) is set to be 10-13 cm, the length of the welding nail (3) is set to be 1/2-3/4 of the height of the beam, and the thickness of the concrete protective layer between the transverse edge and the longitudinal edge of the welding nail (3) and the edge of the beam is not less than 5 cm.
2. The method for manufacturing the laminated beam for strengthening UHPC-NC interface bonding by adopting the tooth-shaped structure as claimed in claim 1, wherein the tooth-shaped structure is designed into an isosceles trapezoid, the height of the tooth-shaped structure is set to be 1/4-1/3 of the beam height, the width of the upper bottom is set to be 1/12-1/10 of the beam width, the width of the lower bottom is set to be 1/6-1/5 of the beam width, and the number of the tooth-shaped structures is determined according to the beam width.
3. The manufacturing method of the laminated beam for strengthening UHPC-NC interface bonding by adopting the dentate structure is characterized in that a welding nail (3) is vertically inserted in the center of the dentate structure, and the insertion depth is 3/4-4/5 of the height of the welding nail (3).
4. The method for manufacturing the composite beam for strengthening UHPC-NC interface bonding by adopting the dentate structure is characterized in that the horizontal distance of the longitudinal section of the welding nail (3) is set between 70cm and 90 cm.
5. The method for manufacturing the laminated beam for strengthening UHPC-NC interface bonding by adopting the dentate structure as claimed in claim 1, wherein the thickness of the UHPC (1) at the lower part is set to be 1/4-1/3 of the beam height, and the thickness of the NC (2) at the upper part is set to be 2/3-3/4 of the beam height.
6. Method for making a composite beam using a tooth-like structure to reinforce UHPC-NC interfacial adhesion according to claim 1 characterized by that the weld nails (3) are replaced by steel bars.
7. A manufacturing method of a laminated beam for strengthening UHPC-NC interface bonding by adopting a dentate structure is characterized by comprising the following steps:
A. determining the number of tooth-shaped structures and the number of trapezoidal foams according to the size of the manufactured UHPC-NC superposed beam;
B. determining the number of the welding nails (3) according to the length and the number of the tooth-shaped structures of the manufactured UHPC-NC superposed beam;
C. erecting vertical templates at two sides of the trapezoidal foam, and vertically inserting a welding nail (3) at the center of the lower bottom of the trapezoidal foam;
D. pouring UHPC (1) with the beam height of 1/4-1/3;
E. and after the UHPC (1) on the lower part is solidified and hardened, removing the foam, reserving the welding nails and the vertical template, pouring the NC (2) on the upper part to form the superposed beam, and maintaining the UHPC-NC superposed beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911270345.8A CN112936508A (en) | 2019-12-11 | 2019-12-11 | Manufacturing method of laminated beam for reinforcing UHPC-NC interface bonding by adopting dentate structure |
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| CN201911270345.8A CN112936508A (en) | 2019-12-11 | 2019-12-11 | Manufacturing method of laminated beam for reinforcing UHPC-NC interface bonding by adopting dentate structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563389A (en) * | 2014-12-22 | 2015-04-29 | 扬州大学 | High-strength reinforced and functionally-graded concrete beam |
| CN104674658A (en) * | 2015-01-12 | 2015-06-03 | 东南大学 | Single layer FRP concrete composite bridge slab construction method |
| CN208183954U (en) * | 2018-05-09 | 2018-12-04 | 常州工程职业技术学院 | A kind of prefabricated assembled bean column node construction |
| CN110528763A (en) * | 2019-09-29 | 2019-12-03 | 福州大学 | Thin-walled UHPC with perforated panel PBL key and NC superimposed sheet and its construction method |
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2019
- 2019-12-11 CN CN201911270345.8A patent/CN112936508A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563389A (en) * | 2014-12-22 | 2015-04-29 | 扬州大学 | High-strength reinforced and functionally-graded concrete beam |
| CN104674658A (en) * | 2015-01-12 | 2015-06-03 | 东南大学 | Single layer FRP concrete composite bridge slab construction method |
| CN208183954U (en) * | 2018-05-09 | 2018-12-04 | 常州工程职业技术学院 | A kind of prefabricated assembled bean column node construction |
| CN110528763A (en) * | 2019-09-29 | 2019-12-03 | 福州大学 | Thin-walled UHPC with perforated panel PBL key and NC superimposed sheet and its construction method |
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Application publication date: 20210611 |