阅读说明：本技术 一种提高特重交通混凝土路面修补质量的方法 (Method for improving repairing quality of extra-heavy traffic concrete pavement ) 是由 徐凯 范晓钧 曹聪 单佳成 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种提高特重交通混凝土路面修补质量的方法,针对混凝土路面缺陷,本发明提高商品砼的强度等级,重新优化配合比,在道路弯道和交叉口的混凝土里增加钢纤维,采用小型夯实机械对路基进行夯实,采用低标号砼代替基层填料,定期检查灌缝的老化和缺失,及时补灌缝；道路纵向较低处增加流水槽,保证渗水被及时排除。本发明简单易行,提高砼的弯拉强度,控制坍落度,耐久性好,提高和完善了特重交通混凝土路面修补的技术水平,降低修补频率,提高经济效益和社会效益。(The invention discloses a method for improving the repairing quality of an extra-heavy traffic concrete pavement, aiming at the defects of the concrete pavement, the method improves the strength grade of commercial concrete, optimizes the mix proportion again, adds steel fibers in the concrete of a road curve and an intersection, adopts a small-sized tamping machine to tamp a roadbed, adopts low-grade concrete to replace base filler, regularly checks the aging and the loss of crack pouring, and timely mends the crack pouring; the water flowing grooves are added at the longitudinal lower part of the road, so that the seepage water is ensured to be removed in time. The method is simple and easy to implement, improves the flexural tensile strength of the concrete, controls the slump, has good durability, improves and perfects the technical level of repairing the concrete pavement of the extra-heavy traffic, reduces the repairing frequency, and improves the economic benefit and the social benefit.)

1. A method for improving the repairing quality of an extra-heavy traffic concrete pavement is characterized by comprising the following steps: the method comprises the following steps:

(1) excavating concrete and asphalt concrete of the damaged pavement, and excavating a lime-fly-ash gravel base course;

(2) paving 30cmC15 concrete;

(3) pouring 28cmC40 concrete surface layers, matching double layers of bidirectional reinforcing steel meshes in the middle, ∅ [email protected], and adding steel fibers in the concrete at the intersection and the bend;

(4) a water flowing groove is added at the lower part of the longitudinal direction of the road;

(5) and (5) checking the aging and the deficiency of the crack pouring at regular intervals, and repairing the crack in time.

2. The method for improving the repair quality of the extra heavy traffic concrete pavement according to claim 1, wherein the method comprises the following steps: the mixing ratio of the concrete in the step (3) is as follows: cement: water: sand: crushing stone: water reducing agent = 1: 0.38: 1.29: 2.87: 1 percent.

3. The method for improving the repair quality of the extra heavy traffic concrete pavement according to claim 1, wherein the method comprises the following steps: the specific gravity of the steel fiber in the step (3) is 1.5%.

4. The method for improving the repair quality of the extra heavy traffic concrete pavement according to claim 1, wherein the method comprises the following steps: and (4) the bottom of the launder is 5-10cm lower than the concrete surface layer.

Technical Field

The invention belongs to the technical field of road engineering, and particularly relates to a method for improving the repairing quality of an extra-heavy traffic concrete pavement.

Background

The road construction in China is greatly developed after reform is opened, the transportation level is greatly improved, the traffic flow and the vehicle load are large on some roads, the road damage is serious, the positions of a bend and an intersection are particularly serious, and the structure of the conventional road is generally as follows: the general repairing method comprises the steps of 1.5 m-thick gray subgrade, 20 cm-thick two-gray gravel base layer, 4cmAC20 asphalt concrete and 28cmC30 plain concrete surface layer, wherein the defects of uneven settlement of concrete slabs, irregular fracture of concrete slabs, bottom void of concrete slab slabs, corner breakage of concrete slab slabs and the like can occur after a long time, the common repairing method is a repairing method of chiseling all partial or whole damaged concrete slabs, pouring new concrete after the base layer is treated, repairing is carried out according to the repairing method, the following quality defects can easily occur again after the concrete slab concrete is used for a period of time, and the indexes of 1, bending strength and working performance can not meet the requirements; 2. the corner base layer of the plate is not compacted by rolling; 3. seepage water is not drained timely between the surface layer and the base layer; because the damaged roads which are frequently transported are important transportation life lines, the high-frequency repair has great influence on production and transportation, so that the repair quality is improved, and the repair frequency is reduced, and the semi-circular shape and the economy are great.

Disclosure of Invention

In order to solve the problems, the invention discloses a method for improving the repairing quality of an extra-heavy traffic concrete pavement, which is simple and feasible, has high pavement strength and good durability, reduces the repairing frequency, and improves the economic benefit and the social benefit.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a method for improving the repairing quality of an extra-heavy traffic concrete pavement comprises the following steps:

(1) excavating concrete and asphalt concrete of the damaged pavement, and excavating a lime-fly-ash gravel base course;

(2) paving 30cmC15 concrete;

(3) pouring 28cmC40 concrete surface layers, matching double layers of bidirectional reinforcing steel meshes in the middle, ∅ [email protected], and adding steel fibers in the concrete at the intersection and the bend;

the optimized mixing ratio (weight ratio) of the C40 concrete is as follows: cement: water: sand: crushing stone: water reducing agent = 1: 0.38: 1.29: 2.87: 1 percent.

The specific gravity (weight ratio) of the steel fiber is 1.5%.

(4) A water flowing groove is added at the lower part of the longitudinal direction of the road;

(5) and (5) checking the aging and the deficiency of the crack pouring at regular intervals, and repairing the crack in time.

As an improvement of the invention, the bottom of the launder is 5-10cm lower than the concrete surface layer.

The invention has the beneficial effects that:

the method for improving the repairing quality of the extra-heavy traffic concrete pavement is simple and easy to implement, high in pavement strength and good in durability, reduces repairing frequency, and improves economic benefits and social benefits.

Detailed Description

The present invention will be further illustrated below with reference to specific embodiments, which are to be understood as merely illustrative and not limitative of the scope of the present invention.

Taking the XX road as an example, aiming at three quality defects which often occur, the method carries out targeted improvement:

1. aiming at the defect that the bending strength and the working performance index do not meet the requirements, the invention improves the strength grade of the commercial concrete and optimizes the mix proportion on the one hand, and increases the steel fiber in the concrete at the local position of the road (curve and intersection) on the other hand, thereby improving the bending strength of the concrete, controlling the slump and leading the working performance index to meet the requirements.

2. Aiming at the defects of incompact rolling of the plate corner and the base and broken corners of the plate, the invention adopts a small-sized tamping machine to tamp the roadbed on one hand, and replaces the base filler by low-grade concrete (C15) on the other hand, thereby ensuring that the compactness of the base meets the requirement.

3. Aiming at the defect that the drainage of the seepage water between the surface layer and the base layer is not in time, on one hand, the watering frequency of the road is reduced, on the other hand, the aging and the deficiency of the crack pouring are regularly checked, and the crack pouring is timely supplemented; the water flowing grooves are added at the longitudinal lower part of the road, so that the seepage water is ensured to be removed in time.

The method for improving the repairing quality of the extra-heavy traffic concrete pavement is simple and easy to implement, high in pavement strength and good in durability, improves and perfects the repairing technical level of the extra-heavy traffic concrete pavement, reduces the repairing frequency by 20%, and improves economic benefits and social benefits.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.