Pavement splicing method and structure for old cement concrete pavement reconstruction and expansion

Abstract

The invention discloses a pavement splicing method and structure for old cement concrete pavement reconstruction and expansion. A cement concrete slab splicing seam is formed in a hard shoulder of an old cement concrete slab, steps are arranged on an old road upper base layer, an old road lower base layer and an old road cushion layer for transition, poor concrete is adopted for a new road upper base layer of an expansion part, and unscreened macadam is adopted for a road bed; a new cement concrete slab and the old cement concrete slab are connected by adopting double-layer reinforcing steel bars; a high-molecular polymer anti-cracking paste is firstly stuck to the cement concrete slab splicing seam, then an asphalt concrete anti-cracking leveling interlayer is paved, and a lower asphalt concrete surface layer and an upper asphalt concrete surface layer are finally paved sequentially, wherein the lower asphalt concrete surface layer is doped with 0.3% by mass of short-cut basalt fiber. According to the method and structure, the problem that the durability of existing old cement concrete pavement reconstruction and expansion engineering is insufficient can be effectively solved, and the important significant is achieved for promoting quicker and better development of transportation industry in China.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a pavement splicing method and structure suitable for reconstruction and expansion of old cement concrete pavement. Background technique [0002] After nearly 30 years of vigorous development of my country's highway construction industry, the scale of the highway network has continued to expand, and the tasks of highway maintenance and repair have continued to increase. According to the "2014 Transport Industry Development Statistical Bulletin" issued by the Ministry of Transport on April 30, 2015, As of the end of 2015, the total mileage of expressways in my country has reached 125,400 kilometers. The "Twelfth Five-Year Plan" period is a key stage in the development of my country's road transportation from focusing on construction to construction, maintenance, management, and transportation coordination. During the "Thirteenth Five-Year Plan" period my country will continue...

AI Technical Summary

Problems solved by technology

The problems faced by most countries in the world are basically the same. Under the influence of climate environment and vehicle load, the performance of pavement gradually decreases, and because the growth rate of traffic volume during the design period is much higher than expected, many cement pavements in my country Severe structural damage and functional decline occurred before the service life was reached, and the original two-way four-lane expressway is also difficult to meet the increasingly heavy traffic demand. If the problem is limited and the service level is lowered, the road will not be able to meet the needs of economic and social development, and may even hinder the development of local economic and social construction to some extent.

Therefore, the cement pavement built in the early stage of our country urgently needs to be upgraded through quality improvement and expansion. However, mature old road reconstruction and expansion design and construction technology and corresponding design standards have not yet been formed, especially in the key technical link of new and old pavement splicing. , road workers often have no scientific and effective methods to follow

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