CN212834824U - Low-reinforcement-ratio continuous reinforced concrete pavement structure - Google Patents
Low-reinforcement-ratio continuous reinforced concrete pavement structure Download PDFInfo
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- CN212834824U CN212834824U CN202021144861.4U CN202021144861U CN212834824U CN 212834824 U CN212834824 U CN 212834824U CN 202021144861 U CN202021144861 U CN 202021144861U CN 212834824 U CN212834824 U CN 212834824U
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Abstract
The utility model discloses a low reinforcement ratio continuous reinforcement concrete pavement structure, which comprises a subbase layer, a base layer, a buffer layer and a low reinforcement ratio continuous reinforcement concrete pavement layer which are sequentially laid from bottom to top; the low-reinforcement-ratio continuous reinforcement concrete surface layer is internally provided with single-layer continuous reinforcement or double-layer continuous reinforcement, and the concrete surface layer is provided with a transverse contraction joint at intervals of a certain distance L. The reinforcing steel bar distribution rate is reduced, the using amount of the reinforcing steel bars is reduced, the transverse contraction joint construction is greatly simplified, the transverse contraction joint interval is increased, the joint cutting workload and the later-stage joint damage are reduced, and the engineering practical value is very high.
Description
Technical Field
The utility model relates to a road engineering technical field, concretely relates to continuous reinforced concrete pavement structure of low arrangement of reinforcement rate.
Background
The continuous reinforced concrete pavement is a cement concrete pavement which is characterized in that longitudinal continuous reinforcing steel bars and transverse reinforcing steel bars are arranged in a surface layer, and shrinkage joints are not transversely arranged. The continuous reinforced concrete pavement can be free of transverse contraction joints because the structure is internally provided with enough longitudinal steel bars, the longitudinal reinforcement ratio is usually as high as 0.6-1.0%, the shrinkage cracking of the concrete is limited through the bonding effect between the longitudinal steel bars and the concrete, and the transverse shrinkage cracks are dispersed into a plurality of micro cracks with certain intervals, so that the aim of not cutting the contraction joints is fulfilled. The reinforced concrete pavement is a cement concrete pavement with longitudinal and transverse reinforcing steel bars or reinforcing mesh arranged in a surface layer and provided with joints, the longitudinal reinforcing steel bars in the structure are usually discontinuous, the reinforcement ratio is much lower than that of a continuous reinforced concrete pavement, the longitudinal reinforcement ratio is usually 0.1-0.2%, and because of the constraint effect of the longitudinal discontinuous reinforcing steel bars, compared with a common concrete pavement, the longitudinal reinforcing steel bars are required to be provided with contraction joints at 4-6 m, the reinforced concrete pavement is provided with the transverse contraction joints at 6-15 m in the length direction, and the contraction joint distance is increased.
The continuous reinforced concrete pavement generally requires that the width of a crack gap at the embedding depth of a longitudinal steel bar is not more than 0.5mm, the average distance of transverse cracks is not more than 1.8m, the crack gap is too small, the impact damage is easy to cause, the wide cracks can be generated when the crack gap is too large, and the wide cracks can cause rainwater infiltration and steel bar corrosion. In reality, due to the diversity of materials, the variability of construction, the uncertainty of load and the experience of a design method, unreasonable crack forms such as short-distance wide cracks often appear on the continuous reinforced concrete pavement, and researches show that 90% of breaking diseases occur at crack dense positions of 30-60 cm, so that pre-cutting seams are performed after the continuous reinforced concrete pavement is finished for some projects, active control on the cracks is hoped to be performed, but the pre-cutting seam interval is difficult to determine, and no theoretical support exists. Although the transverse contraction joint space of the reinforced concrete pavement is increased, smooth round steel bar dowel bars of the front steel bar support are required to be arranged between the transverse contraction joints, the construction is complex, the period is long, and the joint cutting workload is still large. Based on the problems, the development of the low-reinforcement-ratio continuous reinforced concrete pavement structure which has the reinforcement ratio between the continuous reinforced concrete pavement and the reinforced concrete pavement, has continuous longitudinal reinforcements, replaces a dowel bar and is provided with large-interval transverse contraction joints is necessary, the problems of the two pavement structures can be effectively solved, the consumption of the reinforcements can be reduced, the joint cutting can be reduced, the construction is simple and convenient, and the engineering investment can be saved.
Disclosure of Invention
The to-be-solved technical problem of the utility model is, to the above-mentioned defect that prior art exists, provide a continuous arrangement of reinforcement concrete pavement structure of low arrangement of reinforcement rate, reduce the reinforcing bar quantity, simplified horizontal contraction joint construction greatly, increased horizontal contraction joint interval, reduced joint-cutting work load and later stage seam disease, had very big engineering practical value.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:
a low-reinforcement-ratio continuous reinforced concrete pavement structure comprises an underlayer, a base layer, a buffer layer and a low-reinforcement-ratio continuous reinforced concrete pavement which are sequentially paved from bottom to top; the low-reinforcement-ratio continuous reinforcement concrete surface layer is internally provided with single-layer continuous reinforcement or double-layer continuous reinforcement, and the concrete surface layer is provided with a transverse contraction joint at intervals of a certain distance L.
According to the technical scheme, the single-layer continuous reinforcement comprises continuous longitudinal steel bars and continuous transverse steel bars, and the longitudinal steel bars are arranged above the transverse steel bars.
According to the technical scheme, the double-layer continuous reinforcing steel bar comprises an upper-layer continuous reinforcing steel bar and a lower-layer continuous reinforcing steel bar;
the upper continuous steel bars comprise continuous longitudinal steel bars and continuous transverse steel bars, and the longitudinal steel bars are arranged above the transverse steel bars in the upper continuous steel bars; the lower continuous reinforcing steel bars comprise continuous longitudinal reinforcing steel bars and continuous transverse reinforcing steel bars, and the transverse reinforcing steel bars are arranged above the longitudinal reinforcing steel bars in the lower continuous reinforcing steel bars.
According to the technical scheme, the diameter of the longitudinal steel bar is 14-20 mm, and the distance between two adjacent longitudinal steel bars is 150-350 mm;
the diameter of the transverse steel bar is 12 mm-16 mm, and the distance between two adjacent transverse steel bars is 300 mm-600 mm.
According to the technical scheme, the paving material of the subbase layer is granular material or inorganic binder stable material, and the thickness of the subbase layer is 15-20 cm; the paving material of the base layer is an inorganic binder stabilizing material or a low-strength cement concrete material, the base layer is formed by paving one or two layers of paving materials, and the thickness of a single layer of paving material of the base layer is 15-20 cm; the buffer layer is made of asphalt concrete material not less than 2 cm.
According to the technical scheme, the reinforcement ratio of the low-reinforcement-ratio continuous reinforcement concrete surface layer is 0.2% -0.6%, the spacing distance L of the transverse contraction joints is 20-65 m, and the thickness of the low-reinforcement-ratio continuous reinforcement concrete surface layer is 22-30 cm.
According to the technical scheme, when the road surface is of a medium traffic load grade, the reinforcement ratio is 0.2% -0.3%; when the road surface is in heavy traffic load grade, the reinforcement ratio is 0.3% -0.4%; when the road surface is in an extra-heavy traffic load grade, the reinforcement ratio is 0.4% -0.5%; when the road surface is in the grade of extremely heavy traffic load, the reinforcement ratio is 0.5-0.6%.
According to the technical scheme, the type of the steel bar is HRB400 hot-rolled ribbed steel bar.
According to the technical scheme, the depth of the transverse contraction joint is not more than 4cm, and the width of the transverse contraction joint is 5-10 cm.
According to the technical scheme, the transverse contraction joint is filled with polyurethane or high-viscosity high-elasticity modified asphalt.
The utility model discloses following beneficial effect has:
the utility model provides a low arrangement of reinforcement rate reinforced concrete pavement structure in succession, this structure not only can reduce the arrangement of reinforcement rate, reduces the reinforcing bar quantity, has replaced the dowel steel through vertical continuous reinforcing bar in addition, no longer need set up the dowel steel support, has simplified the construction greatly, because the arrangement of reinforcement rate is higher than reinforced concrete pavement, its contraction joint interval can continue the increase again, has reduced joint-cutting work load and later stage seam disease, has very big engineering practical value.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a low-reinforcement-ratio continuous-reinforced concrete pavement structure in an embodiment of the present invention;
in the figure, 1-underlayer, 2-base layer, 3-buffer layer, 4-continuous reinforced concrete surface layer with low reinforcement ratio, 5-transverse steel bar, 6-longitudinal steel bar and 7-transverse contraction joint.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the continuous reinforced concrete pavement structure with low reinforcement ratio in the embodiment provided by the present invention comprises an underlayer 1, a base layer 2, a buffer layer 3 and a continuous reinforced concrete surface layer 4 with low reinforcement ratio, which are sequentially laid from bottom to top; the low-reinforcement-ratio continuous reinforced concrete surface layer 4 comprises a concrete surface layer internally provided with single-layer continuous reinforcement or double-layer continuous reinforcement, and transverse contraction joints 7 are arranged on the concrete surface layer at intervals of a certain distance L.
Further, the single-layer continuous reinforcement includes a plurality of continuous longitudinal reinforcing bars 6 and transverse reinforcing bars 5, and the longitudinal reinforcing bars 6 are arranged above the transverse reinforcing bars 5.
Further, the double-layer continuous reinforcing steel bars comprise upper-layer continuous reinforcing steel bars and lower-layer continuous reinforcing steel bars;
the upper continuous steel bar comprises a plurality of continuous longitudinal steel bars 6 and transverse steel bars 5, and in the upper continuous steel bar, the longitudinal steel bars 6 are arranged above the transverse steel bars 5; the lower continuous reinforcement includes continuous longitudinal reinforcements 6 and transverse reinforcements 5, and in the lower continuous reinforcement, the transverse reinforcements 5 are arranged above the longitudinal reinforcements 6.
Further, in the continuous reinforcement of individual layer and the continuous reinforcement of double-deck, a plurality of continuous longitudinal reinforcement 6 arrange in same height side by side, extend along road length direction, and a plurality of transverse reinforcement 5 arrange in proper order along road length direction.
Furthermore, the diameter of the longitudinal steel bar is 14-20 mm, and the distance between two adjacent longitudinal steel bars 6 is 150-350 mm;
the diameter of the transverse steel bars 5 is 12 mm-16 mm, and the distance between two adjacent transverse steel bars 5 is 300 mm-600 mm.
Furthermore, the paving material of the subbase layer 1 is granular material or inorganic binder stable material, and the thickness of the subbase layer 1 is 15-20 cm; is a layer structure and is a secondary bearing layer of the whole pavement structure.
Further, the paving material of the base layer 2 is an inorganic binder stabilizing material or a low-strength cement concrete material, and the single-layer thickness of the base layer 2 is 15-20 cm; the base layer 2 is laid by one layer or two layers.
Further, the buffer layer 3 is an asphalt concrete material not less than 2 cm; the buffer layer 3 is an important functional layer which is opened from top to bottom in the whole pavement structure, and has the functions of providing a lower bearing layer with higher flatness, reducing the bonding degree of the surface layer and the base layer 2, reducing the frictional resistance, preventing rainwater from infiltrating downwards, absorbing stress of a lower-layer reflection crack, reducing the temperature and humidity warping deformation of a surface layer concrete slab and the like.
Furthermore, the reinforcement ratio of the low-reinforcement-ratio continuous reinforced concrete surface layer 4 is 0.2% -0.6%, the spacing distance L of the transverse contraction joints 7 is 20-65 m, and the thickness of the low-reinforcement-ratio continuous reinforced concrete surface layer 4 is 22-30 cm.
Further, the steel bar is HRB400 hot rolled ribbed steel bar.
Further, when the road surface is in a medium traffic load grade, the reinforcement ratio is 0.2% -0.3%;
when the road surface is in heavy traffic load grade, the reinforcement ratio is 0.3% -0.4%;
when the road surface is in an extra-heavy traffic load grade, the reinforcement ratio is 0.4% -0.5%;
when the road surface is in the grade of extremely heavy traffic load, the reinforcement ratio is 0.5-0.6%.
Further, although a certain amount of longitudinal continuous steel bars are arranged on the low-reinforcement-ratio continuous reinforced concrete surface layer 4, the reinforcement ratio of the low-reinforcement-ratio continuous reinforced concrete surface layer is not enough to completely control the development of the transverse contraction joints 7, so that the transverse contraction joints 7 still need to be arranged at a certain interval, and the higher the reinforcement ratio is, the larger the contraction joint interval is.
Further, the transverse contraction joint 7 is filled with polyurethane or high-viscosity high-elasticity modified asphalt.
The utility model provides an embodiment, as shown in FIG. 1, a low reinforcement ratio continuous reinforced concrete pavement structure includes: the concrete reinforcing structure comprises a subbase layer 1, a base layer 2, a buffer layer 3, a low-reinforcement-ratio continuous reinforced concrete surface layer 4, transverse reinforcing steel bars 5, longitudinal reinforcing steel bars 6 and transverse contraction joints 7.
The subbase layer 1 is laid on a roadbed, the designed resilience modulus of the top surface of the roadbed is not less than 40MPa, the deflection of the subbase layer can be controlled by a Beckman beam method, and the acceptance deflection value of the subbase layer is required to be not more than 200(0.01 mm). The subbase layer 1 can be made of graded broken stone, cement stabilized graded broken stone, secondary ash stabilized graded broken stone and other materials, and is usually a layer, and the suitable thickness of the subbase layer is 15-20 cm.
The base layer 2 is laid on the subbase layer 1, materials such as cement stabilized graded broken stone, two-ash stabilized graded broken stone, lean concrete and roller compacted concrete can be adopted, the structure can be of one-layer or two-layer structure, the single-layer appropriate thickness of the cement stabilized graded broken stone and the two-ash stabilized graded broken stone is 15-20 cm, and the single-layer appropriate thickness of the lean concrete and the roller compacted concrete is 15-20 cm.
The buffer layer 3 is laid on the base layer 2, and when the base layer 2 is cement-stabilized graded broken stone or two-ash-stabilized graded broken stone, the buffer layer can adopt sand grain type asphalt concrete AC-5 or fine grain type asphalt concrete AC-10 which is not less than 2 cm; when the base layer 2 is lean concrete or roller compacted concrete, fine-grained asphalt concrete AC-13 of not less than 4cm can be used for the buffer layer.
The low-reinforcement-ratio continuous reinforced concrete surface layer 4 is laid on the buffer layer 3, the bending tensile strength standard value is not less than 4.5MPa at the medium traffic load level, is not less than 5.0MPa at the heavy traffic load level and above, and the suitable thickness is 22-30 cm.
The range of the longitudinal reinforcement ratio of the low reinforcement ratio continuous reinforcement surface layer 4 is 0.2-0.6%, wherein the reinforcement ratio is preferably 0.2-0.3% at a medium traffic load level, the reinforcement ratio is preferably 0.3-0.4% at a heavy traffic load level, the reinforcement ratio is preferably 0.4-0.5% at an extra-heavy traffic load level, and the reinforcement ratio is preferably 0.5-0.6% at an extremely-heavy traffic load level.
And longitudinal steel bars 6 and transverse steel bars 5 for supporting the longitudinal steel bars 6 are arranged inside the low-reinforcement-ratio continuous reinforced concrete surface layer 4. The diameter of the adopted transverse steel bars 5 is generally 12 mm-16 mm, and the spacing is generally 300 mm-600 mm. The diameter of the adopted longitudinal steel bar 6 is generally 14 mm-20 mm, and the distance is generally 150 mm-350 mm. The installation height of the longitudinal steel bar 6 is combined with engineering practice, and the method comprises the following two steps of controlling cracks and improving bearing capacity: the roadbed stabilizing section adopts single-layer reinforcing steel bars, and the longitudinal steel bars 6 are arranged at the position which is 5cm away from the surface of the panel; the subgrade under-stabilized section adopts double-layer reinforcing bars, the upper-layer longitudinal reinforcing steel bars 6 are arranged at the positions about 5cm away from the surface of the panel, and the lower-layer longitudinal reinforcing steel bars 6 are arranged at the positions about 3cm away from the bottom surface of the panel.
Although a certain amount of longitudinal continuous steel bars are arranged on the low-reinforcement-ratio continuous reinforced concrete surface layer 4, the reinforcement ratio of the low-reinforcement-ratio continuous reinforced concrete surface layer is not enough to completely control the development of the transverse contraction joint, so that the transverse contraction joints 7 still need to be arranged at certain intervals, and the higher the reinforcement ratio is, the larger the contraction joint interval is, and the corresponding relationship between the reinforcement ratio and the transverse contraction joint is shown in table 1.
And the transverse contraction joint 7 of the low-reinforcement-ratio continuous reinforced concrete surface layer 4 is subjected to joint cutting according to the interval corresponding to the reinforcement ratio. In order to avoid cutting the longitudinal steel bars, the depth of the cutting seam of the transverse contraction joint 7 is smaller than that of the common cement concrete pavement, and the depth of the cutting seam is usually not more than 4 cm; the width of a joint of the transverse contraction joint 7 can be slightly larger than that of a joint of a cement concrete pavement, the width of the joint is usually 5-10 mm, and the joint is filled by polyurethane or high-viscosity high-elasticity modified asphalt after the joint is cut.
The spacing distance L of the transverse contraction joints of the low-reinforcement-ratio continuous reinforced concrete surface layer 4 is as follows:
wherein [ sigma ]s]ksfsy；
In the formula, rho is the reinforcement ratio of the continuous reinforced concrete pavement with low reinforcement ratio,%; [ sigma ]s]-allowable stress of the bars, MPa; k is a radical ofs-the allowable stress reduction factor of the steel reinforcement; f. ofsy-yield strength of the steel reinforcement, MPa; k is a radical ofcConsidering a comprehensive coefficient influenced by factors such as theoretical and actual differences, construction variation level, material parameter variation level and the like;
-theoretical and actual difference coefficients;
-construction variation level coefficient;
-coefficient of variation level of material parameter; mu.s0The dynamic friction coefficient of the surface layer and the base layer of the low-reinforcement-ratio continuous reinforced concrete pavement; gamma-concrete Severe, kN/m3；
The allowable stress reduction coefficient of the steel bar is generally 75-85%, and the representative value can be 80%;
the coefficient of difference between the theoretical coefficient and the actual coefficient is generally 0.05-0.25, and the representative value can be 0.15;
the construction variation level coefficient can be 0.18 in the first level, 0.26 in the second level and 0.36 in the third level, and the higher the road grade is, the lower the variation level is;
the coefficient of variation level of the material parameters can be 0.05 at first time, 0.10 at second time, 0.15 at third time, and the higher the road grade is, the lower the variation level is;
the dynamic friction coefficient of a surface layer and a base layer of the low-reinforcement-ratio continuous reinforced concrete pavement is generally 1.5-8.9, and the dynamic friction coefficient is small due to the fact that multiple relative sliding can be generated between the surface layer and the base layer due to temperature rising and falling, and the representative value of the dynamic friction coefficient can be 1.8;
the concrete has the heavy weight of 24kN/m3。
The above is only a preferred embodiment of the present invention, and the scope of the right of the present invention should not be limited by this, so that the equivalent changes made in the claims of the present invention still belong to the protection scope of the present invention.
Claims (10)
1. A low-reinforcement-ratio continuous reinforced concrete pavement structure is characterized by comprising an underlayer, a base layer, a buffer layer and a low-reinforcement-ratio continuous reinforced concrete pavement which are sequentially paved from bottom to top; the low-reinforcement-ratio continuous reinforcement concrete surface layer is internally provided with single-layer continuous reinforcement or double-layer continuous reinforcement, and the concrete surface layer is provided with a transverse contraction joint at intervals of a certain distance L.
2. A low-reinforcement-ratio continuous-reinforced concrete pavement structure as claimed in claim 1, wherein the single-layer continuous reinforcement includes continuous longitudinal and transverse reinforcements, the longitudinal reinforcement being disposed above the transverse reinforcement.
3. The low-reinforcement-ratio continuous-reinforced concrete pavement structure as claimed in claim 1, wherein the double-layer continuous reinforcement includes upper-layer continuous reinforcement and lower-layer continuous reinforcement; the upper continuous steel bars comprise continuous longitudinal steel bars and continuous transverse steel bars, and the longitudinal steel bars are arranged above the transverse steel bars in the upper continuous steel bars; the lower continuous reinforcing steel bars comprise continuous longitudinal reinforcing steel bars and continuous transverse reinforcing steel bars, and the transverse reinforcing steel bars are arranged above the longitudinal reinforcing steel bars in the lower continuous reinforcing steel bars.
4. The low-reinforcement-ratio continuous reinforced concrete pavement structure as claimed in claim 2 or 3, wherein the diameter of the longitudinal steel bars is 14 mm-20 mm, and the distance between two adjacent longitudinal steel bars is 150 mm-350 mm; the diameter of the transverse steel bar is 12 mm-16 mm, and the distance between two adjacent transverse steel bars is 300 mm-600 mm.
5. The low-reinforcement-ratio continuous reinforced concrete pavement structure as claimed in claim 1, wherein the laying material of the sub-base layer is granular or inorganic binder stabilizing material, and the thickness of the sub-base layer is 15-20 cm; the paving material of the base layer is an inorganic binder stabilizing material or a low-strength cement concrete material, the base layer is formed by paving one or two layers of paving materials, and the thickness of a single layer of paving material of the base layer is 15-20 cm; the buffer layer is made of asphalt concrete materials not less than 2cm, and the thickness of the low-reinforcement-ratio continuous reinforced concrete surface layer is 22-30 cm.
6. The low-reinforcement-ratio continuous reinforced concrete pavement structure as claimed in claim 1, wherein the reinforcement ratio of the low-reinforcement-ratio continuous reinforced concrete pavement is 0.2-0.6%, and the spacing distance L of the transverse contraction joints is 20-65 m.
7. The low-reinforcement-ratio continuous-reinforced concrete pavement structure of claim 6, wherein when the pavement is of a medium traffic load grade, the reinforcement ratio is 0.2-0.3%; when the road surface is in heavy traffic load grade, the reinforcement ratio is 0.3% -0.4%; when the road surface is in an extra-heavy traffic load grade, the reinforcement ratio is 0.4% -0.5%; when the road surface is in the grade of extremely heavy traffic load, the reinforcement ratio is 0.5-0.6%.
8. A low-reinforcement-ratio continuous-reinforced concrete pavement structure as claimed in claim 1, wherein the type of the steel bar is HRB400 hot-rolled ribbed steel bar.
9. The low-reinforcement-ratio continuous-reinforced concrete pavement structure as claimed in claim 1, wherein the depth of the transverse contraction joint is not more than 4cm, and the width is 5-10 mm.
10. The continuous reinforced concrete pavement structure with low reinforcement ratio as claimed in claim 1, wherein the transverse contraction joint is filled with polyurethane or high-viscosity high-elasticity modified asphalt.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113136760A (en) * | 2021-04-09 | 2021-07-20 | 中铁第四勘察设计院集团有限公司 | Intelligent track road pavement structure based on track disease control and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113136760A (en) * | 2021-04-09 | 2021-07-20 | 中铁第四勘察设计院集团有限公司 | Intelligent track road pavement structure based on track disease control and construction method |
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