CN114293432B - Method for actively inducing continuous reinforced concrete pavement cracks - Google Patents
Method for actively inducing continuous reinforced concrete pavement cracks Download PDFInfo
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- CN114293432B CN114293432B CN202111636253.4A CN202111636253A CN114293432B CN 114293432 B CN114293432 B CN 114293432B CN 202111636253 A CN202111636253 A CN 202111636253A CN 114293432 B CN114293432 B CN 114293432B
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Abstract
The invention discloses a method for actively inducing cracks of a continuous reinforced concrete pavement, which comprises the following steps ofThe reinforcing mesh of the pavement adopts a mode of combining twisted steel bars and smooth round steel bars, and the difference of the unit surface area S of the two steel bars is utilized to cause the difference of the relative slippage quantity tau between the two steel bars and the concrete, so as to cause the shrinkage deformation delta of the concrete at the position where the two steel bars are positioned s The shrinkage deformation delta of the parts where the two reinforcing steel bars are located is influenced, and the shrinkage deformation delta of the parts where the smooth reinforcing steel bars are located on the pavement and the shrinkage deformation delta of the rest parts are obviously different by controlling the proportion and the position of the threaded reinforcing steel bars and the smooth reinforcing steel bars in the reinforcing steel bar network, so that transverse cracks are actively induced at the parts where the smooth reinforcing steel bars are located on the pavement. The method can predictably and uniformly generate transverse cracks in the range of smooth round steel bars on the continuous reinforced concrete pavement, avoid irregular cracks such as dense cracks and wide cracks on the pavement, and ensure the quality and the service life of the pavement.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a method for actively inducing cracks of a continuous reinforced concrete pavement.
Background
The continuous reinforced concrete pavement is a cement concrete pavement in which continuous reinforcing steel bars are arranged in the longitudinal direction, and in which expansion joints are provided at the junction with other pavement or at the position adjacent to a structure, and in which construction joints are provided as required, and in which no transverse shrinkage joints are provided. Compared with the structural design of common concrete pavement, the longitudinal continuous reinforcing steel bars of the continuous reinforced concrete pavement limit the cracking of the panel caused by longitudinal shrinkage, overcome the defects of various pavement diseases (such as mud pumping, staggered platform) and the like caused by the arrangement of transverse expansion joints and shrinkage joints of the joint cement concrete pavement, and improve the service performance of the pavement.
Longitudinal steel bars in the continuous reinforced concrete pavement play a role in restraining crack expansion and bearing the shrinkage stress of concrete, but not increasing the flexural tensile strength of the concrete pavement. The dosage of the longitudinal steel bars is not designed according to the load of the vehicle, but is designed according to the index requirements of crack spacing, crack width and the like, and the shrinkage and temperature deformation of the concrete are considered. For these indexes, the current specifications in China are as follows: (1) in order to avoid or reduce the possibility of spalling and breaking damage at the cracks of the concrete facing plate, the average spacing of the transverse cracks is required to be 1.0-2.5 m; (2) in order to avoid or reduce the possibility of flaking and water penetration, it is desirable that the slit width does not exceed 1mm.
The investigation shows that the actual gap cannot completely meet the requirements of the specification, and irregular cracks such as dense cracks and wide cracks often occur. After the road surface is opened for traffic, the longitudinal cracking can be generated by repeated fatigue action of the crack through the vehicle load together with the action of the vehicle load. The actual cracks cannot meet the requirement of every 1.0-2.5 m, so that the phenomenon that the width of the pavement crack exceeds 1mm is caused.
Disclosure of Invention
The invention aims to provide a method for actively inducing continuous reinforced concrete pavement cracks, which can predictably and uniformly generate transverse cracks in the range of smooth round steel bars on the continuous reinforced concrete pavement, and avoid irregular cracks such as dense cracks, wide cracks and the like of the concrete pavement, thereby ensuring the quality and the service life of the pavement.
The technical scheme adopted by the invention is as follows:
a method for actively inducing cracks of continuous reinforced concrete pavement comprises the steps that a reinforcing mesh of the continuous reinforced concrete pavement adopts a mode of combining twisted steel with plain round steel, and the difference of unit surface areas S of two steel bars is utilized to cause the difference of relative slippage tau between the two steel bars and concrete, so that the shrinkage deformation delta of the concrete at the position where the two steel bars are located is caused s The shrinkage deformation delta of the parts where the two reinforcing steel bars are located is influenced, and the shrinkage deformation delta of the parts where the smooth reinforcing steel bars are located on the pavement and the shrinkage deformation delta of the rest parts are obviously different by controlling the proportion and the position of the threaded reinforcing steel bars and the smooth reinforcing steel bars in the reinforcing steel bar network, so that transverse cracks are actively induced at the parts where the smooth reinforcing steel bars are located on the pavement.
Preferably, a piece of transverse smooth steel bar is arranged on the longitudinal steel bar at intervals of L, two sides combined with the transverse smooth steel bar are each a longitudinal smooth steel bar section with the width of B, the rest are threaded steel bars, L is arranged according to the required average spacing of the transverse cracks, and 2B is arranged according to the required width of the transverse cracks.
Preferably, L is 1.0 to 2.5m.
The beneficial effects of the invention are as follows:
the method can predictably and uniformly generate transverse cracks in the range of smooth round steel bars on the continuous reinforced concrete pavement, and avoid irregular cracks such as dense cracks, wide cracks and the like of the concrete pavement, thereby ensuring the quality and the service life of the pavement.
Drawings
Fig. 1 is a general sectional view of a continuously reinforced concrete pavement in an embodiment of the present invention.
In the figure: 1-a screw-thread steel bar; 2-plain round steel bars; 3-natural boundary of transverse section; 4-concrete.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in FIG. 1, a reinforcing mesh of a continuous reinforced concrete pavement adopts a mode of combining a twisted steel 1 and a plain round steel 2, and utilizes the difference of unit surface areas S of two steel bars to cause the difference of relative slippage tau between the two steel bars and concrete, thereby causing the shrinkage deformation delta of the concrete at the position of the two steel bars s The shrinkage deformation delta of the parts where the two reinforcing steel bars are located is influenced, and the shrinkage deformation delta of the parts where the smooth reinforcing steel bars 2 are located on the pavement and the shrinkage deformation delta of the rest parts are obviously different by controlling the proportion and the positions of the threaded reinforcing steel bars 1 and the smooth reinforcing steel bars 2 in the reinforcing steel bar network, so that transverse cracks are actively induced at the parts where the smooth reinforcing steel bars 2 are located on the pavement. The continuous reinforced concrete pavement generates shrinkage deformation due to the bearing of cooling load and the shrinkage action of concrete, and the shrinkage deformation delta is the shrinkage deformation delta of the cooling load t And shrinkage deformation delta of concrete s Two-part composition, i.e. delta=delta t +δ s Wherein, the shrinkage deformation delta of the cooling load t Due to the change of outdoor temperature environment, the concrete shrinkage deformation delta is an objective factor and is difficult to control during design and implementation s Belonging toThe design and implementation part of the continuous reinforced concrete pavement belongs to the controllable quantity, so that the shrinkage deformation delta of the concrete is controlled s The shrinkage deformation delta of the continuous reinforced concrete pavement is controlled, so that the purpose of actively configuring the cracks of the continuous reinforced concrete pavement is achieved, and meanwhile, the unit surface area S of the deformed rebar 1 and the smooth round rebar 2 is different (the surface area of the deformed rebar 1 with the same length is about 1.3 times that of the smooth round rebar 2), so that the friction force difference between the deformed rebar 1 and the smooth round rebar 2 when being combined with the concrete 4 is large, and the relative slippage tau between the deformed rebar 1 and the smooth round rebar 2 and the concrete 4 is different in the bonding failure process (tau=k/log S) 2 Where k is the coefficient of adhesive stiffness between the rebar and the concrete 4), that is, the shrinkage deformation delta at different positions can be controlled by controlling the proportion and the position of the twisted rebar 1 and the plain round rebar 2 in the continuous reinforced concrete pavement.
As shown in fig. 1, in this embodiment, a transverse plain-round bar 2 is arranged on the longitudinal bar at intervals of L, two sides combined with the transverse plain-round bar 2 are each a longitudinal plain-round bar 2 section with a width B, the rest are screw bars 1, L are arranged according to the required average spacing of the transverse slits, and 2B are arranged according to the required width of the transverse slits. L is preferably 1.0 to 2.5m.
The method can predictably and uniformly generate transverse cracks in the range of the plain round steel bars 2 on the continuous reinforced concrete pavement, and avoid irregular cracks such as dense cracks, wide cracks and the like of the concrete pavement, thereby ensuring the quality and the service life of the pavement.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (2)
1. A method for actively inducing cracks of a continuous reinforced concrete pavement is characterized by comprising the following steps of: the reinforcing mesh of the continuous reinforced concrete pavement adopts a mode of combining a twisted steel bar and a plain round steel bar, and utilizes the difference of unit surface areas S of two steel bars to cause the difference of relative slippage tau between the two steel bars and concrete, thereby advancingThereby causing shrinkage deformation delta of the concrete at the positions of the two reinforcing steel bars s The difference of the two parts of the steel bars is influenced, and the ratio and the position of the threaded steel bars and the smooth steel bars in the steel bar net are controlled, so that the shrinkage deformation delta of the parts of the smooth steel bars on the pavement and the shrinkage deformation delta of the rest parts are obviously different, and the transverse crack is actively induced at the parts of the smooth steel bars on the pavement; and arranging a piece of transverse smooth steel bars on the longitudinal steel bars at intervals of L, wherein two sides combined with the transverse smooth steel bars are longitudinal smooth steel bar segments with the width of B respectively, the rest are threaded steel bars, L is arranged according to the required average spacing of the transverse cracks, and 2B is arranged according to the required width of the transverse cracks.
2. The method for actively inducing cracks in a continuously reinforced concrete pavement according to claim 1, wherein: l is 1.0-2.5 m.
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| CN202111636253.4A CN114293432B (en) | 2021-12-29 | 2021-12-29 | Method for actively inducing continuous reinforced concrete pavement cracks |
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| CN202111636253.4A CN114293432B (en) | 2021-12-29 | 2021-12-29 | Method for actively inducing continuous reinforced concrete pavement cracks |
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| CN114293432A CN114293432A (en) | 2022-04-08 |
| CN114293432B true CN114293432B (en) | 2023-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104988823A (en) * | 2015-05-22 | 2015-10-21 | 长沙理工大学 | Cement concrete pavement structure provided with continuous steel bars |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0726364B2 (en) * | 1992-11-26 | 1995-03-22 | 株式会社ピー・エス | Continuous concrete pavement |
| JP2948737B2 (en) * | 1994-10-03 | 1999-09-13 | 株式会社巴コーポレーション | Drying shrinkage crack-inducing joint treatment method for concrete |
| WO2002012630A1 (en) * | 2000-08-04 | 2002-02-14 | Building Innovations Pty Ltd | Method and system for constructing large continuous concrete slabs |
| CN102071615B (en) * | 2010-12-21 | 2012-12-26 | 东南大学 | Method for controlling crack spacing of continuously reinforced cement concrete pavement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104988823A (en) * | 2015-05-22 | 2015-10-21 | 长沙理工大学 | Cement concrete pavement structure provided with continuous steel bars |
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