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Joint construction method for preventing reflection cracks generated during spreading of asphalt on old concrete pavement

A technology of reflective cracks and construction methods, which is applied in the direction of roads, roads, pavement details, etc., can solve uneconomical problems, achieve the effect of preventing reflective cracks, preventing the occurrence and development of reflective cracks, and reducing relative vertical displacement

Active Publication Date: 2015-06-03
SHANGHAI SHISHEN IND & TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is not economical to delay the occurrence of shear reflective cracks by increasing the thickness of the overlay

Method used

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  • Joint construction method for preventing reflection cracks generated during spreading of asphalt on old concrete pavement
  • Joint construction method for preventing reflection cracks generated during spreading of asphalt on old concrete pavement

Examples

Experimental program
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Embodiment 1

[0030] In this embodiment, first, the deflection pretreatment of the old concrete panels is carried out, and the deflection difference between the two old concrete panels that need joint reinforcement is measured, and the old concrete with a deflection difference exceeding 0.04-0.06mm is selected. panel.

[0031] For old concrete panels with a deflection difference between 0.04-0.06mm, the joint construction method of paving asphalt reflective cracks on the surface is realized through the following steps:

[0032] The first step, the pretreatment of planting reinforcement: in the joint of the two old concrete panels 8, the additional stress concentration area of ​​the vehicle load acts on the joint and cuts out strip grooves 13 at equal intervals across the joint, and the strip grooves 13 are the planting Rib position, use impact drill to carry out vertical drilling to the end of strip groove 13 again, and this hole extends to be positioned at the inside of base 9 at the lower...

Embodiment 2

[0045] In this embodiment, the deflection difference between the two old concrete panels requiring joint reinforcement is measured, and the old concrete panels whose measured value of the deflection difference exceeds 0.06 mm are selected.

[0046] For the old concrete panels whose deflection difference exceeds 0.06mm, when performing joint treatment of overlaying asphalt reflective cracks, it is necessary to pre-treat the old concrete panels before planting bars on the basis of Example 1. The slab grouting treatment is carried out on the concrete slab, so that the deflection difference between the slabs is less than the allowable value of the deflection difference, which is convenient to meet the requirements of the design standard and ensure the effectiveness and success rate of the subsequent reinforcement. The grouting material is cement mortar with compressive strength ≥ 15Mpa. The gradation composition of cement mortar is: cement: water = 1.0:5, and based on the total mas...

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Abstract

The invention relates to a joint construction method for preventing reflection cracks generated during spreading of asphalt on an old concrete pavement. The method comprises the following steps: firstly determining the inter-panel deflection difference of old concrete panels to be jointed for reinforcing; after qualification, cutting across the joints at the joints of the two old concrete panels to obtain equal-distance stripe-type grooves and then vertically drilling the end parts of the stripe-type grooves by using an impact drill; bending a reinforcing steel bar according to the hole depth, the length of the grooves and the width of the inter-panel joint and finishing forming of a horseshoe rib; after transplanting the horseshoe ribs into the stripe-type grooves and the vertical holes in the end parts, pouring epoxy resin embedded steel bar glue into the cleaned drilling holes; mixing concrete and broken stone concrete, pouring into the grooves to form an embedded steel bar protective layer; and sequentially spreading layers of protective covering surfaces on the upper layers of the two waste concrete panels from bottom to top. The method provided by the invention has the advantages that the relative vertical displacement at two sides of the old panel joint, the reflection cracks are prevented to generate and develop so as to reduce or stop reflection cracks generated during spreading of asphalt on an old concrete pavement.

Description

technical field [0001] The invention relates to the technical field of road and traffic engineering, in particular to a joint construction method for preventing asphalt reflection cracks on old cement pavement. Background technique [0002] Cement concrete has good deformation resistance and water stability. In the 1880s and 1890s, a large number of cement concrete pavements were built in various places. At present, the cement concrete pavement in many areas or urban roads in our country is facing maintenance and renovation, and the old cement pavement reconstruction technical solution is to add asphalt overlay on the old cement pavement. [0003] Due to the structural characteristics of the asphalt overlay on the old cement pavement, after a period of use, the asphalt overlay overlay is prone to cracks under the action of vehicle load and temperature. The cause of the reflective cracks in the overlay asphalt surface is the horizontal displacement of the old cement slab and...

Claims

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Application Information

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IPC IPC(8): E01C7/32E01C11/02E01C7/35
CPCE01C7/35E01C11/06
Inventor 徐勋倩瞿志军陈德元葛文璇何长春周海燕苏秋明汤天培朱勇
Owner SHANGHAI SHISHEN IND & TRADE CO LTD
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