CN212270576U - Heat preservation formula is from restoring to throne and is prevented crack dowel steel - Google Patents
Heat preservation formula is from restoring to throne and is prevented crack dowel steel Download PDFInfo
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- CN212270576U CN212270576U CN202020224989.5U CN202020224989U CN212270576U CN 212270576 U CN212270576 U CN 212270576U CN 202020224989 U CN202020224989 U CN 202020224989U CN 212270576 U CN212270576 U CN 212270576U
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Abstract
The utility model discloses a heat preservation type self-resetting crack-resistant dowel bar, which comprises an annular outer steel plate, an annular middle steel plate, an annular inner steel plate and round steel bars sleeved in the annular inner steel plate, wherein the annular outer steel plate, the annular middle steel plate and the annular inner steel plate are coaxial annular structures with sequentially reduced outer diameters, and the annular outer steel plate and the annular middle steel plate are fixedly connected through foam concrete; and a spring cavity for arranging a steel spring is formed between the annular middle steel plate and the annular inner steel plate, one end of the steel spring is connected with the outer wall of the annular inner steel plate, and the other end of the steel spring is connected with the inner wall of the annular middle steel plate. The utility model discloses a foam concrete buffering is to round steel bar's load and temperature variation, reduces the dowel bar slack volume increase phenomenon that takes place after the stress concentration phenomenon produces through steel spring, and the two complements each other, with the calamity cost reduction that the dowel bar causes.
Description
Technical Field
The utility model belongs to the technical field of the dowel steel, concretely relates to heat preservation formula is from crack control seam dowel steel that restores to throne.
Background
Along with the rapid economic development in recent years in China, the transportation industry is more and more developed, and in the transportation industry, the proportion of road surface driving is larger, so that the road surface driving is an important component of the transportation industry in China. However, with the increase of vehicles running on the road surface, the concrete traffic road surface inevitably has some disastrous damages, and particularly for the concrete road surface constructed a plurality of years ago, the indexes of the concrete traffic road surface, such as the use strength, the service life and the like, are far inferior to those of the road newly constructed at present. As a result, the personnel often demolish and rebuild the disaster pavement.
In order to avoid uneven settlement between new and old road surfaces and even the problems caused thereby, dowel bars are often used to connect the new and old road surfaces together. Although the arrangement of the dowel bars can obviously improve the load transfer capacity between the plates and reduce the vertical deformation of the plate edges and the plate corners, thereby delaying the slab staggering development speed and ensuring the long-term use performance of the cement pavement, the existing research shows that the dowel bars and the concrete interface have obvious stress concentration under the action of wheel load or temperature change, and the top and the bottom of the dowel bars have pressure stress concentration, so that the interface is easy to generate initial cracks and crushed, the loosening amount of the dowel bars is increased, the load transfer capacity is reduced, and even the joint of the concrete pavement is damaged.
Therefore, how practical novel dowel steel can play the connection effect to new and old road surface, can reduce dowel steel and concrete interface stress concentration phenomenon again, further prevents that the not hard up concrete pavement that leads to of dowel steel from destroying, is the problem that the present urgent need of technical staff in the field solved.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model aims to provide a heat preservation formula is from restoring to throne crack control dowel steel, has cushioned concrete road surface traffic load and the stress concentration phenomenon that temperature variation produced to dowel steel and concrete interface to can reduce the displacement of dowel steel to all directions after stress concentration phenomenon takes place, make the position of dowel steel more stable, the prevention dowel steel is because of not hard up lead to the biography lotus ability decline, concrete road surface production crack.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a heat-preservation type self-resetting crack-resistant dowel bar comprises an annular outer steel plate, an annular middle steel plate, an annular inner steel plate and round steel bars sleeved in the annular inner steel plate, wherein the annular outer steel plate, the annular middle steel plate and the annular inner steel plate are coaxial annular structures with sequentially reduced outer diameters, and the annular outer steel plate and the annular middle steel plate are fixedly connected through foam concrete; and a spring cavity for arranging a steel spring is formed between the annular middle steel plate and the annular inner steel plate, one end of the steel spring is connected with the outer wall of the annular inner steel plate, and the other end of the steel spring is connected with the inner wall of the annular middle steel plate.
The annular middle steel plate and the annular inner steel plate are provided with a plurality of steel spring units at equal intervals, and the steel spring units comprise four steel springs which are annularly arrayed between the annular inner steel plate and the annular middle steel plate and take the axis of the annular inner steel plate as the center.
And two ends of the steel spring are fixed on the outer wall of the annular inner steel plate and the inner wall of the annular middle steel plate through spiral steel wires.
The inner diameter of the annular inner steel plate is larger than the outer diameter of the round steel bar, and a gap is formed between the inner diameter of the annular inner steel plate and the outer diameter of the round steel bar.
The annular outer steel plate is a high-strength medium-thickness steel plate, the annular middle steel plate is a heat-resistant thin steel plate, and the annular inner steel plate is a high-strength thin steel plate.
The density of the foam concrete is 400-600 kg/m3。
Compared with the prior art, the utility model, following beneficial effect has:
1. the foam concrete has the material characteristics of heat preservation, heat insulation, good freezing resistance and the like, has good physical mechanical properties and good light high-strength heat insulation performance, and can better exert the heat preservation function for the internal round steel bar, thereby reducing the stress concentration phenomenon of the interface of the round steel bar and the concrete;
2. the porosity of the bubble mixed light soil enables the foam concrete to have low elastic modulus, so that the foam concrete has good absorption and dispersion effects on impact load, and the stress concentration phenomenon caused by traffic load change is effectively reduced;
3. the utility model provides a foam concrete mainly used buffering is to round steel bar's load and temperature variation, and spring assembly mainly used reduces the dowel bar slack volume increase phenomenon that takes place after stress concentration phenomenon produces. The two supplement each other, so that the disaster cost caused by the dowel bar is reduced;
4. the utility model discloses a durable material is all used to each item structure, and life is longer.
Drawings
Fig. 1 is an overall three-dimensional schematic diagram of the present invention;
FIG. 2 is a transverse cross-sectional view of FIG. 1;
FIG. 3 is a vertical cross-sectional view of FIG. 1;
FIG. 4 is a three-dimensional schematic view of a structural separation;
FIG. 5 is a partial enlarged view of the steel spring;
FIG. 6 is an enlarged view of a portion of FIG. 5;
fig. 7 is the schematic view of the road structure layout of the present invention.
In the figure: 1. annular outer steel plate, 2, foam concrete, 3, annular middle steel plate, 4, spring device cavity, 5, annular inner steel plate, 6, round steel bar, 7, steel spring, 8, steel wire, 9, heat preservation type self-reset crack control dowel steel, 10, local crushing and board beating repair, 11, original cement concrete panel, 12, concrete curb, 13, original ground line, 14, galvanized steel bar net, 15, synchronous broken stone seal, 16, medium grain type dense graded asphalt concrete, 17, oil adhesion layer, 18, thick grain type dense graded SBS modified asphalt concrete, 19, the gradient is 2%.
Detailed Description
The conception, the details and the technical effects obtained by the present invention are further explained with reference to the accompanying drawings as follows:
as shown in figures 1-7, the utility model discloses a heat preservation type self-reset crack-resistant dowel bar, which comprises a ringThe steel bar reinforced concrete hollow steel plate comprises an outer annular steel plate 1, an inner annular steel plate 3, an inner annular steel plate 5 and round steel bars 6 sleeved in the inner annular steel plate 5, wherein the outer annular steel plate 1, the inner annular steel plate 3 and the inner annular steel plate 5 are coaxial annular structures with sequentially reduced outer diameters, and the outer annular steel plate 1 and the inner annular steel plate 3 are fixedly connected through foam concrete 2; a spring cavity 4 for arranging a steel spring 7 is formed between the annular middle steel plate 3 and the annular inner steel plate 5, one end of the steel spring 7 is connected with the outer wall of the annular inner steel plate 5, and the other end of the steel spring is connected with the inner wall of the annular middle steel plate 3, and according to the scheme, the foam concrete 2 filled between the annular outer steel plate 1 and the annular middle steel plate 3 has the material characteristics of good heat preservation, heat insulation, frost resistance and the like, has good physical and mechanical properties and good light high-strength heat insulation performance, and can better play a heat preservation function for the inner round steel bar 6, so that the stress concentration phenomenon of the round steel bar and a concrete interface is reduced; the porosity of the bubble mixed light soil enables the foam concrete 2 to have low elastic modulus, so that the foam concrete 2 has good absorption and dispersion effects on impact load, the stress concentration phenomenon caused by traffic load change is effectively reduced, and the preferable density of the foam concrete 2 is 400-600 kg/m3。
Equal interval is provided with a plurality of steel spring units between steel sheet 5 in 3 and the annular in the steel sheet in the annular, steel spring unit includes that the axis of steel sheet 5 is the annular array for the center in the annular four steel spring 7 between steel sheet 5 and the annular in the steel sheet 3 to reply round steel bar 6 to the displacement of all directions, foam concrete 2 mainly used buffering in the present case is to round steel bar 6 load and temperature variation, and steel spring 7 mainly used reduces the power transmission pole pine momentum increase phenomenon that takes place after stress concentration phenomenon produces, and the two complements each other, with the calamity cost reduction that the power transmission pole causes.
The both ends of steel spring 7 are fixed in through being spiral steel wire 8 the outer wall of steel sheet 5 in the annular and on the inner wall of steel sheet 3 in the annular, every tie point of steel sheet 3 and steel sheet 5 in the annular in steel spring 7 and the annular all need use steel wire 8 to carry out the ligature and weld steel sheet 3 and the annular in steel sheet 5 in the annular in steel spring 7 and the annular to this strengthens being connected of steel spring 7 and steel sheet 3 and steel sheet 5 in the annular in with the annular.
The inner diameter of the annular inner steel plate 5 is larger than the outer diameter of the round steel bar 6, a gap is formed between the inner diameter of the annular inner steel plate and the outer diameter of the round steel bar 6, the gap is small, and the round steel bar 6 and other structures can be regarded as two separated individuals.
The annular outer steel plate 1 is a high-strength medium-thickness steel plate, the annular middle steel plate 3 is a heat-resistant thin steel plate, the annular inner steel plate 5 is a high-strength thin steel plate, durable materials are used, and the service life is long.
By current research discovery, when the temperature variation, there is obvious stress concentration phenomenon in ordinary dowel steel and concrete interface, there is pressure stress concentration phenomenon in dowel steel top and bottom, has tensile stress concentration phenomenon at the dowel steel both ends to lead to interface department to produce the crack easily and crowd the bits of broken glass, the increase of dowel steel amount of looseness, and the utility model provides a novel dowel steel structure in contain foam concrete, possess the thermal-insulated good performance of light excelling in, can regard as heat preservation formula material, make the temperature environment of inside round steel bar reduce undulant, make its temperature environment more stable, thereby slow down stress concentration phenomenon.
And the foam concrete has good absorption and dispersion effects on impact load. When traffic load changes, the foam concrete can buffer the effect of the load on the inner round steel bars, so that the stress concentration phenomenon caused by the load is limited.
Simultaneously, when the dowel bar takes place the increase of the amount of looseness, the usable elastic potential energy of steel spring in the novel dowel bar and the conversion of kinetic energy will play the cushioning effect to shifting of round bar, reduce the displacement of dowel bar to avoid the reduction of round bar's biography lotus ability.
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (6)
1. The utility model provides a heat preservation formula is from restoring to throne crack control dowel steel which characterized in that: the steel bar reinforced concrete hollow steel plate comprises an annular outer steel plate (1), an annular middle steel plate (3), an annular inner steel plate (5) and round steel bars (6) sleeved in the annular inner steel plate (5), wherein the annular outer steel plate (1), the annular middle steel plate (3) and the annular inner steel plate (5) are coaxial annular structures with sequentially reduced outer diameters, and the annular outer steel plate (1) and the annular middle steel plate (3) are fixedly connected through foam concrete (2); form spring cavity (4) that are used for setting up steel spring (7) between steel sheet (5) in steel sheet (3) and the annular in the annular, the one end of steel spring (7) with the outer wall of steel sheet (5) links to each other in the annular, the other end with the inner wall of steel sheet (3) links to each other in the annular.
2. The heat-preservation self-resetting crack-control dowel bar of claim 1, wherein: the annular middle steel plate (3) and the annular inner steel plate (5) are provided with a plurality of steel spring units at equal intervals, and the steel spring units comprise four steel springs (7) which are annularly arrayed on the annular inner steel plate (5) and the annular middle steel plate (3) by taking the axis of the annular inner steel plate (5) as the center.
3. The heat-preservation self-resetting crack-control dowel bar of claim 2, wherein: the two ends of the steel spring (7) are fixed on the outer wall of the annular inner steel plate (5) and the inner wall of the annular middle steel plate (3) through spiral steel wires (8).
4. The heat-preservation self-resetting crack-control dowel bar of claim 1, wherein: the inner diameter of the annular inner steel plate (5) is larger than the outer diameter of the round steel bar (6), and a gap is formed between the inner diameter of the annular inner steel plate and the outer diameter of the round steel bar.
5. The heat-preservation self-resetting crack-control dowel bar of claim 1, wherein: the annular outer steel plate (1) is a high-strength medium-thickness steel plate, the annular middle steel plate (3) is a heat-resistant thin steel plate, and the annular inner steel plate (5) is a high-strength thin steel plate.
6. The heat-preservation self-resetting crack-control dowel bar of claim 1, wherein: the density of the foam concrete (2) is 400-600 kg/m3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020224989.5U CN212270576U (en) | 2020-02-28 | 2020-02-28 | Heat preservation formula is from restoring to throne and is prevented crack dowel steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020224989.5U CN212270576U (en) | 2020-02-28 | 2020-02-28 | Heat preservation formula is from restoring to throne and is prevented crack dowel steel |
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| CN212270576U true CN212270576U (en) | 2021-01-01 |
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| CN202020224989.5U Expired - Fee Related CN212270576U (en) | 2020-02-28 | 2020-02-28 | Heat preservation formula is from restoring to throne and is prevented crack dowel steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287044A (en) * | 2020-02-28 | 2020-06-16 | 南昌大学 | Heat preservation formula is from restoring to throne and is prevented crack dowel steel |
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2020
- 2020-02-28 CN CN202020224989.5U patent/CN212270576U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287044A (en) * | 2020-02-28 | 2020-06-16 | 南昌大学 | Heat preservation formula is from restoring to throne and is prevented crack dowel steel |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210101 |