CN211736055U - Adopt spiral reinforcing bar to strengthen structure that UHPC-NC interface bonds - Google Patents
Adopt spiral reinforcing bar to strengthen structure that UHPC-NC interface bonds Download PDFInfo
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- CN211736055U CN211736055U CN201922214834.3U CN201922214834U CN211736055U CN 211736055 U CN211736055 U CN 211736055U CN 201922214834 U CN201922214834 U CN 201922214834U CN 211736055 U CN211736055 U CN 211736055U
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Abstract
The utility model belongs to the structural engineering field, concretely relates to adopt spiral reinforcement to strengthen structure that UHPC-NC interface bonded. When a UHPC-NC superposed beam is poured, 20-30 cm of UHPC (1) is poured, when the lower UHPC (1) is not completely solidified, spiral steel bars (3) are vertically inserted into the lower UHPC (1) along the length direction of the beam according to corresponding positions, the thickness of the edge of the longitudinal section of the beam and the concrete protective layer of the spiral steel bars (3) is 5-10 cm, the transverse distance between the spiral steel bars (3) is 1/3-1/2 of the width of the superposed beam, and the insertion depth is half of the diameter of the spiral steel bars (3). And when the UHPC (1) at the lower part is completely solidified, pouring the NC (2) at the upper part to form a superposed beam, and finally maintaining the UHPC-NC superposed beam. The utility model provides the high cohesive strength of UHPC-NC interface makes the cooperative work ability improvement of two kinds of materials of UHPC-NC superposed beam.
Description
Technical Field
The utility model belongs to the structural engineering field, concretely relates to adopt spiral reinforcement to strengthen UHPC-NC (Ultra-High Performance Concrete and Normal Concrete, Ultra-High Performance Concrete, for short: UHPC, Normal Concrete, for short: NC) interface bonding's structure.
Background
Concrete is one of the most important civil engineering materials of the present generation. The concrete has the characteristics of rich raw materials, low price, simple production process and the like, so that the using amount of the concrete is increased more and more. In addition, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, so the application range of the concrete is very wide. Therefore, it is a direction to be explored in the future to design and manufacture concrete according to predetermined properties and develop new lightweight, high-strength and multifunctional concrete varieties.
The Ultra-High Performance Concrete (called as reactive powder Concrete) is mainly made of steel fibers, a water reducing agent, millimeter-grade quartz sand, micron-grade cement, submicron-grade silica fume and other materials, is the most advanced cement-based engineering material in the current market, and is a revolutionary green energy-saving material. UHPC follows the closest packing design theory, and realizes the large span of engineering materials in the aspects of ultrahigh strength, ultrahigh toughness, antiknock property, high volume stability, low permeability, corrosion resistance and the like. Compared with common concrete, the compressive strength of UHPC is improved to more than 5 times, the flexural strength is more than 10 times, the tensile strength is more than 4 times, and destructive indexes of freeze-thaw spalling, water absorption characteristics and special chloride ion permeation effect are greatly reduced in stages. However, the price is high due to the limitation of technology, manufacturing method and other factors. Ultra-high performance concrete cannot be large-scale
In the current engineering field, bridge construction is generally carried out by adopting a mode of overlapping UHPC and NC, so that the excellent tensile property of the UHPC can be fully exerted, the excellent compression resistance of the NC can be well utilized, and the economic benefit is effectively improved. However, the lamination of two materials inevitably has the risk of shear damage at the connecting interface.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an adopt spiral reinforcement to strengthen structure that UHPC-NC interface bonded. When the UHPC-NC superposed beam is poured, pouring 20-30 cm UHPC, inserting spiral steel bars along the length direction of the beam when the lower part UHPC is not completely solidified, pouring the upper NC to form the superposed beam when the lower part UHPC is completely solidified, and finally curing the UHPC-NC superposed beam. The utility model discloses an use the spiral reinforcement to connect between UHPC-NC connection interface. The bonding strength of a UHPC-NC interface is improved, and the cooperative working capacity of two materials of the UHPC-NC superposed beam is improved. 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 above purpose, the utility model adopts the following technical scheme: a structure for reinforcing UHPC-NC interface bonding by adopting spiral steel bars and a manufacturing method. The spiral steel bar is used as a connecting piece between UHPC and NC interfaces and consists of a lower layer of UHPC, an upper layer of NC and the spiral steel bar.
The structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bar is characterized in that the spiral steel bar is made of high-quality high-strength steel bars.
The structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bars is characterized in that the nominal diameter of the spiral steel bars is 1/3-1/5 of the height of the superposed beam, and the radius of the spiral steel bars is not less than 3 mm.
According to the structure for strengthening UHPC-NC interface bonding by adopting the spiral steel bar, the depth of the spiral steel bar 3 inserted into the UHPC1 is half of the diameter of the spiral steel bar 3.
The structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bars is characterized in that the distance between every two circles of the spiral steel bars 3 is 30-50 mm, the longitudinal distance between the two spiral steel bars 3 is 5-10 cm, and the thickness of a concrete protective layer at the edge of the longitudinal section of the beam is at least 5 cm.
The structure is characterized in that a UHPC-NC interface bonding structure is reinforced by spiral steel bars, the transverse distance between the spiral steel bars is 5-10 cm, and the thickness of a concrete protective layer at the edge of the cross section of a beam is not less than 5 cm;
the utility model discloses following beneficial effect has:
the utility model relates to an adopt spiral reinforcement to strengthen structure that UHPC-NC interface bonded, for guaranteeing the effective bonding at UHPC-NC interface, current universal processing mode is chisel hair, grooving or bar planting etc. and these modes can not guarantee that UHPC-NC interface has fine cohesive strength. The bond at the UHPC-NC interface is susceptible to failure when subjected to large loads. The utility model discloses a spiral reinforcement bar connects, has changed past bonding mode. Solves the problem of insufficient bonding of the existing UHPC-NC interface.
Drawings
FIG. 1 is a schematic cross-sectional view of a UHPC-NC interface bonded composite beam reinforced by spiral steel bars.
Fig. 2 is a cross-sectional schematic section of a UHPC-NC interface bonded composite beam reinforced by spiral steel bars.
In the drawings, 1 is UHPC; 2 is NC; and 3, spiral steel bars.
Detailed Description
In order to understand the technical features, objects, and effects of the present invention more deeply, the present invention will now be described with reference to the accompanying drawings.
Referring to the drawings, in an example of the present invention, a structure for reinforcing UHPC-NC interfacial adhesion using spiral reinforcing steel. The spiral reinforcing steel bar 3 is used as a connecting piece between the interfaces of UHPC1 and NC2, and consists of a lower layer of UHPC1, an upper layer of NC2 and the spiral reinforcing steel bar 3.
The structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bar is characterized in that the spiral steel bar 3 is made of high-quality high-strength steel bars.
According to the structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bars, the nominal diameter of the spiral steel bars 3 is 1/3-1/5 of the height of the superposed beam, and the radius of the spiral steel bars 3 is not less than 3 mm.
According to the structure for strengthening UHPC-NC interface bonding by adopting the spiral steel bar, the depth of the spiral steel bar 3 inserted into the UHPC1 is half of the diameter of the spiral steel bar 3.
The structure for reinforcing UHPC-NC interface bonding by adopting the spiral reinforcing steel bars is characterized in that the distance between every two circles of spiral reinforcing steel bars 3 is 30-50 mm, the longitudinal distance between every two spiral reinforcing steel bars 3 is 5-10 cm, and the thickness of a concrete protective layer at the edge of the longitudinal section of the beam is at least 5 cm.
According to the structure for reinforcing UHPC-NC interface bonding by adopting the spiral steel bars, the transverse distance between the spiral steel bars 3 is 5-10 cm, and the thickness of the concrete protective layer at the edge of the cross section of the beam is not less than 5 cm.
A structure for reinforcing UHPC-NC interface bonding by adopting spiral steel bars and a manufacturing method thereof comprise the following steps:
A. determining the nominal diameter of the spiral steel bars 3 according to the height of the manufactured UHPC-NC superposed beam, and determining the number of the spiral steel bars 3 according to the width of the manufactured UHPC-NC superposed beam;
B. setting a template, and pouring 20-30 cm UHPC 1;
C. vertically inserting spiral steel bars 3 into the corresponding positions along the length direction of the beam when the lower part UHPC1 is not solidified, wherein the diameter of each spiral steel bar 3 is vertical to the horizontal plane of the poured lower part UHPC 1;
D. and after the UHPC1 on the lower part is solidified and hardened, pouring the NC2 on the upper part to form the superposed beam, and curing 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 (6)
1. A structure for reinforcing UHPC-NC interface bonding by adopting spiral steel bars is characterized in that the spiral steel bars (3) are used as connecting pieces between interfaces of UHPC (1) and NC (2), and the structure consists of a lower layer of UHPC (1), an upper layer of NC (2) and the spiral steel bars (3).
2. A structure for UHPC-NC interface bonding reinforced with spiral reinforcement according to claim 1, characterized in that the spiral reinforcement (3) is made of high-quality high-strength steel.
3. A structure for reinforcing UHPC-NC interfacial bonding by spiral steel bars as claimed in claim 1, characterized in that the nominal diameter of the spiral steel bars (3) is 1/3-1/5 of the height of the superposed beam, and the radius of the spiral steel bars (3) is not less than 3 mm.
4. A structure for UHPC-NC interfacial bonding using spiral reinforcement according to claim 1, wherein the spiral reinforcement (3) is inserted into the UHPC (1) to a depth of half the diameter of the spiral reinforcement (3).
5. A structure for strengthening UHPC-NC interface bonding by spiral steel bars according to claim 1, characterized in that the distance between each circle of the spiral steel bars (3) is 30-50 mm, the longitudinal distance between two spiral steel bars (3) is 5-10 cm, and the thickness of the concrete protective layer at the edge of the longitudinal section of the beam is at least 5 cm.
6. The structure for strengthening UHPC-NC interfacial bonding by adopting the spiral steel bars as claimed in claim 1, characterized in that the transverse spacing of the spiral steel bars (3) is 5-10 cm, and the thickness of the concrete protective layer at the edge of the beam cross section is not less than 5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922214834.3U CN211736055U (en) | 2019-12-11 | 2019-12-11 | Adopt spiral reinforcing bar to strengthen structure that UHPC-NC interface bonds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922214834.3U CN211736055U (en) | 2019-12-11 | 2019-12-11 | Adopt spiral reinforcing bar to strengthen structure that UHPC-NC interface bonds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211736055U true CN211736055U (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922214834.3U Expired - Fee Related CN211736055U (en) | 2019-12-11 | 2019-12-11 | Adopt spiral reinforcing bar to strengthen structure that UHPC-NC interface bonds |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211736055U (en) |
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2019
- 2019-12-11 CN CN201922214834.3U patent/CN211736055U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Nanjing daocolt Information Technology Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020980008820 Denomination of utility model: A structure of uhpc-nc interface bonding strengthened by spiral reinforcement Granted publication date: 20201023 License type: Common License Record date: 20201204 Assignee: Jiangsu Qingrui Concrete Construction Engineering Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020980008818 Denomination of utility model: A structure of uhpc-nc interface bonding strengthened by spiral reinforcement Granted publication date: 20201023 License type: Common License Record date: 20201204 |
|
| 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: 20201023 Termination date: 20211211 |