CN100417768C - Timely and rapid repair method for partial damage of asphalt pavement - Google Patents

Abstract

The present invention discloses a method for quickly-repairing local damaged asphalt pavement. Said method includes the following several steps: firstly, defining prefabricated test piece size; according to the damaged size of pavement and combining it with prefabricated test piece size to define the size of pit channel cut in-place; on the basis of prefabricated test piece size defining precamber f=12hx(delta a/a) of prefabricated test piece; utilizing existent wheel-rolling process to form prefabricated test piece; finally making in-place repairing operation.

Description

Timely and rapid repair method for partial damage of asphalt pavement

technical field

The invention belongs to a highway pavement repair method, in particular to a timely and rapid repair method for local damage of asphalt pavement.

Background technique

At home and abroad, hot mix and cold patch asphalt mixtures are often used to repair asphalt pavement. The method is:

Measure 1, hot mix repair asphalt mixture:

Cut and remove the damaged asphalt mixture on site, estimate the total amount of material taken according to the damaged volume, pour the asphalt mixture mixed on site into the pit, use small-scale mechanical rolling or tamping, and open the traffic after the asphalt mixture drops to normal temperature .

This method is a common maintenance measure, and the existing problems mainly include: the quality of the repaired mixture is difficult to control because there is no special mixing equipment for mixing; because it needs to be compacted or compacted by small machines, it takes up a lot of lanes, which affects road traffic capacity and driving safety; The density of the mixture cannot be controlled, and the repair material is easy to run away; the cooling speed of the mixture is slow, which makes it time-consuming to open traffic and cannot be repaired quickly.

Measure two, cold repair asphalt mixture:

Cut and remove the damaged asphalt mixture on site, estimate the total amount of material taken according to the damaged volume, use emulsified asphalt or diluted asphalt to mix the asphalt mixture on site, pour the mixed asphalt mixture into the pit, and use small instruments to tamp the surface traffic is now open.

The main problems are: because it is also mixed on site, the composition is not easy to control, and the performance of asphalt mixture is mainly determined by the constituent materials, so the repair quality is difficult to control; because the amount of repair material is determined by experience, the density is low, and the repair quality It is not easy to guarantee, but a professional construction team is required to complete it.

Since the above maintenance methods are all on-site mixing, it is difficult to guarantee the quality of repair materials for asphalt mixtures with strict requirements on the composition of the mixture; in addition, more construction machinery is required for on-site mixing, resulting in long-term closed traffic, affecting driving safety and traffic Ability; the large difference in modulus between new and old materials, and poor interface bonding are also factors that cause poor repair effects.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a timely and rapid repair method for partial damage of asphalt pavement. This method can repair the local damage of the road at any time and quickly, so it can be selected to repair quickly at the time of the minimum traffic flow of the road, which can improve work efficiency, ensure driving safety and normal traffic capacity of the road.

Technical scheme of the present invention is realized like this: concrete steps are as follows:

The first step is to determine the size of the prefabricated test piece

The product size of the prefabricated test piece series is set as series 1: 50×50×3.5cm, series 2: 80×80×6cm, series 3: 100×100×8cm, series 4: 120×120×10cm, series 5: 150× 150×15cm, five types in total;

In the second step, according to the damage size of the pavement, combined with the size of the prefabricated test piece in the first step, determine the size of the pit after on-site cutting, as follows:

When the size of the pavement damage is smaller than the size of series 1 determined in the first step, determine the size of the pit after on-site cutting to be the size of series 1, that is, 50×50×3.5cm;

When the pavement damage size is between the size of series 1 and series 2 determined in the first step, determine the size of the pit after on-site cutting to be the size of series 2, that is, 80×80×6cm:

When the pavement damage size is between the size of series 2 and series 3 determined in the first step, determine the size of the pit after cutting to be the size of series 3, that is, 100×100×8cm;

When the size of the pavement damage is between the size of series 3 and series 4 determined in the first step, determine the size of the pit after cutting to be the size of series 4, that is, 120×120×10cm;

When the size of the pavement damage is between the size of series 4 and series 5 determined in the first step, determine the size of the pit after cutting to be the size of series 5, that is, 150×150×15cm;

The third step is to determine the pre-camber of the prefabricated specimen based on the size of the prefabricated specimen determined in the second step $f=12h\×\frac{\mathrm{\Δa}}{a},$ in:

(1) a is the width of the prefabricated test piece, corresponding to the series 1 to series 5 products determined in the first step, and the values of a are 50cm, 80cm, 100cm, 120cm, 150cm;

(2) h is the height of the prefabricated test piece, corresponding to the series 1 to series 5 products determined in the first step, and the h values are 3.5cm, 6cm, 8cm, 10cm, 15cm;

(3) Δa is the difference between the two side lengths of the pit after cutting and the side length of the prefabricated specimen, take the maximum value of the difference between the length and width of the pit after cutting and the side length of the prefabricated specimen as Δa, and at the same time $\mathrm{\&Delta;a}<\frac{1}{10}h,$ where h is the height of the prefabricated specimen;

(4) f is the height of the arc of the top surface of the prefabricated test piece, corresponding to the product size of series 1 to series 5 determined in the first step, and the pre-camber is 0.84Δa, 0.90Δa, 0.96Δa, 1.00Δa, 1.20Δa;

The fourth step is to form the prefabricated test piece according to the existing wheel rolling method;

The fifth step, on-site repair

(1) The cutting machine cuts off the damaged asphalt mixture, sprays hot asphalt on the surface of the pit after cutting, and the spraying amount is 2.5Kg/m ² ;

(2) After spraying hot asphalt, spread rice stone on its surface, the spreading amount is 5.0Kg/m ² ;

(3) Put the prefabricated test piece formed in the fourth step into the pit after cutting;

(4) Spray hot asphalt on the surface of the prefabricated test piece, the amount of spraying is 2.0Kg/m ² ;

(5) After spraying hot asphalt, spread rice stone 3.50Kg/m ² on the surface, and the traffic can be opened.

Technical effect of the present invention is as follows:

(1) The on-site repair time is greatly shortened: because the site needs to complete five steps of cutting the damaged pavement, mixing the mixture on site, paving, rolling the mixture on site, and cooling the temperature before it can be opened to traffic. The prefabricated specimen repair technology has completed the work of four steps from on-site mixing to cooling indoors, and only cutting is required on site, so the repair time is greatly shortened, so the repair can be carried out during the time period with the smallest daily traffic volume;

(2) Through indoor prefabricated test pieces, the problem of difficulty in controlling the quality of on-site mixing and paving asphalt mixtures is solved: the on-site mixing and mixing materials are limited by the site, machinery, personnel quality, etc., and it is difficult to ensure the quality, while the quality of asphalt pavement and its composition Closely related, prefabricated test pieces are formed indoors, and will not be affected by the above problems when used on site, ensuring the quality of repaired asphalt mixture;

(3) The prefabricated test piece technology reduces the on-site repair process, reduces the one-time repair cost, and is convenient to complete repairs anytime and anywhere: although the repair is a small amount of work, it is also the same as the normal construction process, requiring heavy equipment such as mixing buildings and road rollers. Cost is inversely proportional to repair mix volume. The maintenance department has to wait until the damaged area of the road surface reaches a certain area before repairing, which misses the best repair time, and the prefabricated test piece is already a finished product, which can be used directly by the maintenance department, so that maintenance can be carried out anytime and anywhere.

Detailed ways

The principle of prestress generation technology

Due to the pre-camber (f) set by the prefabricated specimen, under the action of the driving load, the gap (Δa) between the component and the cutting edge is compactly filled, the contact between the component and the cutting edge produces an arch effect, and the cutting edge produces a reverse force on the component , constraining the limiting member to generate the interface between the prestressed bonded prefabricated specimen and the cutting edge. The pre-camber design of prefabricated test pieces ensures the overall performance between the repair material and the old pavement, and different pre-cast test pieces adopt different pre-camber f $(f=12h\&times;\frac{\mathrm{\&Delta;a}}{a}),$ Where Δa is the maximum value of the difference between the two side lengths of the pit after cutting and the side length of the prefabricated specimen.

Specific implementation steps:

The first step is to determine the size of the prefabricated test piece:

The product size of the prefabricated test piece series is determined as series 1 (50×50×3.5cm), series 2 (80×80×6cm), series 3 (100×100×8cm), series 4 (120×120×10cm), series 5 (150×150×15cm) total five types;

In the second step, according to the damage size of the pavement, combined with the size of the prefabricated test piece in the first step, determine the size of the pit after on-site cutting:

For example: when the size of the pavement damage is smaller than the series 1 product determined in the first step, determine the size of the pit after on-site cutting to be the size of series 1, that is, 50×50×3.5cm;

For example: when the damage size of the pavement is between the series 1 and series 2 products determined in the first step, determine the size of the pit after on-site cutting to be the size of series 2, that is, 80×80×6cm;

For example: when the size of the pavement damage is between series 2 and series 3 determined in the first step, determine the size of the pit after cutting to be the size of series 3, that is, 100×100×8cm;

For example: when the size of the pavement damage is between series 3 and series 4 determined in the first step, determine the size of the pit after cutting to be the size of series 4, that is, 120×120×10cm;

For example: when the damage size of the pavement is between series 4 and series 5 determined in the first step, determine the size of the pit after cutting to be the size of series 5, that is, 150×150×15cm;

The third step is to determine the pre-camber f of the prefabricated specimen on the basis of the plane size of the prefabricated specimen determined in the second step $(f=12h\&times;\frac{\mathrm{\&Delta;a}}{a}),$ in:

(1) a is the width of the prefabricated test piece, corresponding to the series 1 to series 5 products determined in the first step, and the values of a are 50cm, 80cm, 100cm, 120cm, 150cm;

(2) h is the height of the prefabricated test piece, corresponding to the series 1 to series 5 products determined in the first step, and the h values are 3.5cm, 6cm, 8cm, 10cm, 15cm;

(3) Δa is the difference between the two side lengths of the pit after cutting and the side length of the prefabricated specimen (the maximum value of the two differences). $\mathrm{\&Delta;a}<\frac{1}{10}h,$ where h is the height of the prefabricated specimen;

(4) f is the height of the arc on the top surface of the prefabricated test piece, corresponding to the series 1 to series 5 products determined in the first step, and the pre-cambers are 0.84Δa, 0.9Δa, 0.96Δa, 1.0Δa, 1.2Δa respectively;

For example: the size of the prefabricated test piece is 80×80×6cm, the actual size of the pit after cutting is 82×84×6.5cm, then the pre-camber is f=12×6×(84-80)/80=3.6cm. For another example, the size of the prefabricated test piece is 100×100×8cm, and the actual size of the pit after cutting is 102×103×9.0cm, then the pre-camber is f=12×8×(103-100)/100=2.88cm.

The fourth step, indoor molding prefabricated test pieces

According to the asphalt mixture production mix ratio specified in the original pavement design documents, asphalt mixture design density, and the size of the prefabricated test piece determined from the first step to the third step, in accordance with the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTJ052 -2000) on page 252 to 258, "Test of Rutting Plate Formed by Wheel Rolling Method" (0703-1993) formed prefabricated test pieces;

The fifth step, on-site repair

(1) The cutting machine cuts off the damaged asphalt mixture, sprays hot asphalt on the surface of the pit after cutting, and the spraying amount is 2.5Kg/m ² ;

(2) After spraying hot asphalt, spread rice stone on its surface, the spreading amount is 5.0Kg/m ² ;

(3) Put the prefabricated test piece formed in the fourth step into the pit after cutting;

(4) Spray hot asphalt on the surface of the prefabricated test piece, the amount of spraying is 2.0Kg/m ² ;

(5) After spraying hot asphalt, spread rice stone 3.50Kg/m ² on the surface, and the traffic can be opened.

Claims (1)

1. the timely fast repairing method of asphalt road surface local damage is characterized in that concrete steps are as follows:

The first step is determined prefabricated sample dimensions

Prefabricated test specimen series of products size is decided to be serial 1:50 * 50 * 3.5cm, serial 2:80 * 80 * 6cm, serial 3:100 * 100 * 8cm, serial 4:120 * 120 * 10cm, totally five kinds of serial 5:150 * 150 * 15cm;

Second step, according to the road surface breakage size,, determine to cheat the groove size after the on-site cutting in conjunction with the prefabricated sample dimensions of the first step, specific as follows:

When series 1 product size that the road surface breakage size is determined less than the first step, determine on-site cutting after the hole groove be of a size of serial 1 size, i.e. 50 * 50 * 3.5cm;

When the road surface breakage size is between the series 1 that the first step is determined, serial 2 product sizes, determine on-site cutting after the hole groove be of a size of serial 2 sizes, i.e. 80 * 80 * 6cm;

When the road surface breakage size is between the series 2 that the first step is determined, serial 3 product sizes, determine that hole, cutting back groove is of a size of serial 3 sizes, i.e. 100 * 100 * 8cm;

When the road surface breakage size is between the series 3 that the first step is determined, serial 4 product sizes, determine that hole, cutting back groove is of a size of serial 4 sizes, i.e. 120 * 120 * 10cm;

When the road surface breakage size is between the series 4 that the first step is determined, serial 5 product sizes, determine that hole, cutting back groove is of a size of serial 5 sizes, i.e. 150 * 150 * 15cm;

The 3rd step went on foot on the prefabricated sample dimensions basis of determining second, determined the camber of prefabricated test specimen $f=12h\&times;\frac{\mathrm{\&Delta;a}}{a},$ Wherein:

(1) a is the width of prefabricated test specimen, series 1～serial 5 series of products that the corresponding first step is determined, and a value is followed successively by 50cm, 80cm, 100cm, 120cm, 150cm;

(2) h is prefabricated test specimen height, series 1～serial 5 series of products that the corresponding first step is determined, and the h value is followed successively by 3.5cm, 6cm, 8cm, 10cm, 15cm;

(3) Δ a is the difference of cutting back hole two length of sides of groove with the prefabricated test specimen length of side, and the maximum value of getting the length and width of cheating groove in the cutting back and prefabricated test specimen length of side difference is as Δ a, simultaneously $\mathrm{\&Delta;a}<\frac{1}{10}h,$ Wherein h is prefabricated test specimen height;

(4) f is the height of prefabricated test specimen end face circular arc, series 1～serial 5 series of products that the corresponding first step is determined, and camber is respectively 0.84 Δ a, 0.90 Δ a, 0.96 Δ a, 1.00 Δ a, 1.20 Δ a;

The 4th step is according to the moulding prefabricated test specimen of existing rolling method;

The 5th step, field patch

(1) cutting machine excises damaged bituminous mixture, and the hole rooved face sprays heated bitumen, sprinkling amount 2.5Kg/m after cutting ²

(2) behind the sprinkling heated bitumen, at its surperficial spreading rice stone, spreading amount 5.0Kg/m ²

(3) the prefabricated test specimen of forming is put into hole groove after the cutting;

(4) at prefabricated test specimen surface sprinkling heated bitumen, sprinkling amount 2.0Kg/m ²

(5) behind the sprinkling heated bitumen, at its surperficial spreading rice stone 3.50Kg/m ², get final product open to traffic.