CN103556570B - A kind of structure of bridge deck pavement drainage tack coat and construction method thereof - Google Patents

Abstract

The invention discloses a bridge deck pavement drainage adhesive layer structure and a construction method thereof. The bridge deck pavement drainage adhesive layer structure includes an adhesive material layer on the cement concrete bridge surface, and is laid on the adhesive material layer. The plastic drainage body on the plastic drainage body, and the asphalt mixture pavement layer on the plastic drainage body; during construction, on the cement concrete bridge surface, sprinkle bonding materials; lay plastic baffles and plastic drainage grids as one The plastic drainage body with a plastic structure; fill the fine aggregate with a particle size of 2.36~9.5mm in the lower grid of the plastic drainage body; then construct the asphalt mixture pavement layer, and the paved asphalt mixture is embedded in the upper grid of the plastic drainage body middle. The drainage bonding layer of the invention has bonding and reinforcing functions, can resist construction loads, has a drainage function, and has a protective effect on bridge deck cement concrete.

Description

Structure and construction method of a bridge deck pavement drainage bonding layer

technical field

The invention relates to a road pavement structure and a construction method, in particular to a structure and a construction method of a bridge pavement drainage bonding layer.

Background technique

The bonding layer between the cement concrete bridge deck and the asphalt pavement specified in the existing "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004) often uses "modified asphalt sprayed with hot asphalt, hot-melt or solvent-diluted, Modified emulsified asphalt, and then spread a layer of stone chip protective layer" construction technology. The adhesive layer has no lateral drainage function. In actual engineering, rainwater often infiltrates from the asphalt pavement due to segregation during the construction of the asphalt pavement, and remains on the interface between the asphalt pavement and the cement concrete bridge deck. Under the coupling effect of traffic load and temperature, the residual moisture gradually weakens the strength of the asphalt mixture, and eventually water damage such as pits and pumping occurs.

Contents of the invention

The purpose of the present invention is to provide a construction method of a bridge deck pavement drainage bonding layer. The problem to be solved by the present invention is: the water infiltrated into the cement concrete bridge surface is discharged laterally from the drainage bonding layer; the drainage bonding layer plays the role of connecting the cement concrete bridge deck and the asphalt pavement layer; the drainage bonding layer can resist asphalt Construction load action on pavement.

A bridge deck pavement drainage bonding layer structure, which includes a bonding material layer on the cement concrete bridge surface, a plastic drainage body laid on the bonding material layer, and an asphalt mixture paving layer on the plastic drainage body layer; the plastic drainage body is an integrated structure composed of a plastic baffle and a plastic drainage grid, the plastic drainage grid is a double-layer cubic grid including an upper grid and a lower grid, and the plastic drainage grid is located on the plastic On the waterproof board, the lower grid of the plastic drainage grid is filled with fine aggregate with a particle size of 2.36~9.5mm, and the lower end of the asphalt mixture pavement is embedded in the upper grid of the plastic drainage grid.

Further, the bonding material layer adopts emulsified asphalt or hot asphalt, wherein the amount of pure asphalt is 0.5~1.5kg/m ² .

Further, the thickness of the plastic baffle (2) is 0.5 mm ~ 5 mm; the side length of the plastic drainage grid is 10 mm ~ 20 mm, each side is a cylindrical plastic rod (6), and the diameter of the rod is 0.5 mm ~2mm, the plastic drainage body with an integrated structure is allowed to deform to 0~2mm under the condition of 170°C and 1.0MPa compressive stress.

The construction method of the above-mentioned bridge deck pavement drainage adhesive layer, it may further comprise the steps:

The first step is to use the shot blasting process to remove the floating slurry on the cement concrete bridge deck, use high-pressure water to wash the bridge deck after shot blasting, remove all debris, and dry it;

The second step is to spread the bonding material: when the moisture content of the concrete surface of the bridge deck is not greater than 20%, the bonding material is sprinkled;

The third step is to lay the plastic drainage body and fill it with clean fine aggregate:

The factory-made integrated plastic drainage body is laid on the bonding material layer, and the plastic rods are tied with nylon ropes between adjacent plastic drainage bodies to connect them into pieces; finally, the lower grid of the plastic drainage grid The medium filling is fine aggregate with a particle size of 2.36~9.5mm;

The fourth step is to construct the asphalt pavement layer:

Within 2 hours of filling the fine aggregate, construct the asphalt pavement over the plastic drainage body so that the asphalt mixture is embedded in the upper grid of the plastic drainage grid.

Furthermore, emulsified asphalt or hot asphalt is used as the bonding material in the second step, and the dosage is 0.5~1.5kg/m ² of pure asphalt. If the bonding material is emulsified asphalt, plastic drainage must be laid after the emulsified asphalt is broken. If the bonding material is hot asphalt, the plastic drainage body should be laid within 10 minutes after the hot asphalt is spread.

Further, the fine aggregate in the third step requires water washing and sieving, wherein the content of particles below 0.075mm is not more than 0.5%.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

(1) The drainage bonding layer of the present invention has bonding and reinforcing functions. The asphalt pavement layer is embedded in the upper grid of the plastic drainage body, which not only enhances the connection performance between the pavement layer and the drainage adhesive layer, but also has the function of reinforcing the asphalt mixture of the pavement layer and improving the crack resistance of the mixture;

(2) The adhesive layer constructed according to the existing "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004) does not have drainage function. In actual engineering, rainwater often infiltrates from the asphalt pavement due to segregation during the construction of the asphalt pavement, and remains on the interface between the asphalt pavement and the cement concrete bridge deck. Under the coupling effect of traffic load and temperature, the residual moisture gradually weakens the strength of the asphalt mixture, and eventually water damage such as pits and pumping occurs.

The drainage bonding layer of the invention can resist construction load and has drainage function. Filling clean fine aggregate in the lower grid of the plastic drainage body not only enhances the ability of the drainage body to resist the construction load of the asphalt pavement layer, but also after the construction of the asphalt pavement layer, the rainwater infiltrated from the asphalt layer can pass through the aggregate Layers are discharged horizontally, effectively preventing water damage to the asphalt pavement and prolonging the service life of the pavement;

(3) The drainage bonding layer of the present invention has a protective effect on the cement concrete of the bridge deck. After the waterproof board of the plastic drainage body of the integrated structure is bonded to the cement concrete bridge deck, it not only avoids the erosion of water on the cement concrete bridge deck, but also makes the asphalt pavement bond firmly with the cement concrete bridge deck through the plastic drainage body .

Description of drawings

Figure 1 is a schematic diagram of the structure of a bridge deck pavement with a drainage adhesive layer.

Figure 2 is a schematic diagram of the structure of the plastic drainage body.

detailed description

The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

Embodiment one

On the cement concrete bridge deck of a highway, the drainage bonding layer of the present invention has been implemented.

(1) The structure and material of the bridge deck pavement drainage adhesive layer

As shown in Figure 1, on the cement concrete bridge deck 5, sprinkle the bonding material 3; lay the integrated plastic drainage body composed of the plastic water barrier 2 and the plastic drainage grid 1 (as shown in Figure 2); Fill the plastic drainage grid 1 of the plastic drainage body with fine aggregate 7 with a particle size of 2.36-4.75mm; then construct the asphalt mixture pavement layer 4, and the paved asphalt mixture is embedded in the upper grid of the plastic drainage body.

Among them, the bonding material 3 is emulsified asphalt, and the dosage is 0.5kg/m ² of pure asphalt.

The thickness of the plastic baffle 2 forming the plastic drainage body is 0.5 mm; the plastic drainage grid 1 is a double-layer cubic grid with a side length of 10 mm, and each side is a cylindrical plastic rod 6. The rod 6 has a diameter of 0.5 mm. According to the test results, the plastic drainage body with an integrated structure is allowed to deform to 2mm under the condition of 170°C and 1.0MPa compressive stress.

(2) The construction method of the bridge deck pavement drainage adhesive layer

The first step is to use the shot blasting process to remove the laitance on the cement concrete bridge deck. Rinse the bridge deck after shot blasting with high-pressure water, remove all debris, and dry.

The JT-C50 wall surface moisture meter produced by Jingtai Instrument Co., Ltd., Xinghua City, Jiangsu Province was used to measure the moisture content of concrete, and the average value was 20%.

In the second step, the bonding material is sprinkled.

The bonding material is emulsified asphalt, and the dosage is 0.5kg/m ² of pure asphalt. After it breaks the emulsion, lay the plastic drainage body.

The third step is to lay the plastic drainage body and fill it with clean fine aggregate.

The factory-made integrated plastic drainage body is laid on the bonding material. Nylon ropes are used to bind plastic rods between adjacent plastic drainage bodies to form pieces.

The lower grid of the plastic drainage body is filled with fine aggregates with a particle size of 2.36-4.75 mm, washed and screened with water, and the content of particles below 0.075 mm is 0.1%.

The fourth step is to construct the asphalt pavement layer.

After filling the fine aggregate for 1 hour, construct the asphalt mixture pavement layer on the plastic drainage body, so that the asphalt mixture is embedded in the upper grid of the plastic drainage body.

Embodiment two

On the cement concrete bridge deck of a certain municipal road, the drainage bonding layer of the present invention has been implemented.

(1) The structure and material of the bridge deck pavement drainage adhesive layer

As shown in Figure 1, on the cement concrete bridge deck 5, sprinkle the bonding material 3; lay the integrated plastic drainage body composed of the plastic water barrier 2 and the plastic drainage grid 1 (as shown in Figure 2); Fill the fine aggregate 7 with a particle size of 4.75-9.5mm in the lower grid of the plastic drainage body; then construct the asphalt mixture pavement layer 4, and insert the paved asphalt mixture into the upper grid of the plastic drainage body.

Among them, hot asphalt is used as the bonding material 3, and the dosage is 1.5kg/m ² of pure asphalt.

The thickness of the plastic baffle 2 forming the plastic drainage body is 5 mm; the plastic drainage grid 1 is a double-layer cubic grid with a side length of 20 mm, and each side is a cylindrical plastic rod 6. The rod 6 has a diameter of 2 mm. Tests have shown that the plastic drainage body with an integrated structure is allowed to deform to 0.5mm under the condition of 170°C and 1.0MPa compressive stress.

(2) The construction method of the bridge deck pavement drainage adhesive layer

The first step is to use the shot blasting process to remove the laitance on the cement concrete bridge deck. Rinse the bridge deck after shot blasting with high-pressure water, remove all debris, and dry.

The moisture content of concrete was measured with Jingtai brand JT-C50 wall and ground moisture meter produced by Jingtai Instrument Co., Ltd. in Xinghua City, Jiangsu Province, and the average value was 8%.

In the second step, the bonding material is sprinkled.

The bonding material is hot asphalt, and the dosage is 1.5kg/m ² of pure asphalt. Lay the plastic drainage body 10min after its spreading.

The third step is to lay the plastic drainage body and fill it with clean fine aggregate.

The factory-made integrated plastic drainage body is laid on the bonding material. Nylon ropes are used to bind plastic rods between adjacent plastic drainage bodies to form pieces.

The lower grid of the plastic drainage body is filled with fine aggregates with a particle size of 4.75~9.5mm, washed and screened with water, and the content of particles below 0.075mm is 0.5%.

The fourth step is to construct the asphalt pavement layer.

After filling the fine aggregate for 2 hours, construct the asphalt mixture pavement layer on the plastic drainage body, so that the asphalt mixture is embedded in the upper grid of the plastic drainage body.

The drainage bonding layer in this embodiment can resist construction loads and has a drainage function. Filling clean fine aggregate in the lower grid of the plastic drainage body not only enhances the ability of the drainage body to resist the construction load of the asphalt pavement layer, but also after the construction of the asphalt pavement layer, the rainwater infiltrated from the asphalt layer can pass through the aggregate The layer is discharged horizontally, effectively preventing water damage to the asphalt pavement and prolonging the service life of the pavement.

Claims (6)

1. the structure of a bridge deck pavement drainage tack coat, it is characterized in that comprising the bonding material layer (3) be positioned on cement concrete bridge deck, be laid on the plastic row water body on bonding material layer (3), and be positioned at the asphalt mixture paving course (4) on plastic row water body; Described plastic row water body is the integral structure that plastics water-stop sheet (2) forms with plastic draining grid (1), plastic draining grid (1) is the double-deck cube grid comprising upper strata grid and lower floor's grid, plastic draining grid (1) is positioned on plastics water-stop sheet (2), in lower floor's grid of plastic draining grid (1), be filled with the fine aggregate that particle diameter is 2.36 ~ 9.5mm, the lower end of asphalt mixture paving course (4) embeds in the upper strata grid of plastic draining grid (1).

2. the structure of a kind of bridge deck pavement drainage tack coat according to claim 1, it is characterized in that described bonding material layer adopts mulseal or heated bitumen, wherein pitch consumption is 0.5 ~ 1.5kg/m ².

3. the structure of a kind of bridge deck pavement drainage tack coat according to claim 1, is characterized in that the thickness of plastics water-stop sheet (2) is 0.5 mm ~ 5mm; The length of side of plastic draining grid is 10 mm ~ 20mm, and each limit is all cylinder plastics rod member (6), and rod member diameter is 0.5mm ~ 2mm, and the plastic row water body of integral structure is under 170 DEG C of conditions and 1.0MPa action of compressive stress, and allowable transformation is 0 ~ 2mm.

4. possess the construction method of the bridge deck pavement drainage tack coat of structure described in claim 1, it is characterized in that comprising the following steps:

The first step, adopts ball blast technique, removes cement concrete bridge deck laitance, adopts the bridge floor after high pressure water washing ball blast, removes all foreign material, dry;

Second step, spread binding material: when bridge deck concrete surface moisture content is not more than 20%, spread binding material;

3rd step, lay plastic row water body, fill clean fine aggregate:

The plastic row water body of integral structure batch production made is laid on bonding material layer, with nylon rope colligation plastics rod member between adjacent plastic row water body, connects in flakes; After in lower floor's grid of plastic draining grid, fill the fine aggregate that particle diameter is 2.36 ~ 9.5mm;

4th step, construction asphalt mixture surfacing:

After filling fine aggregate in 2 hours, applied asphalt mikture pave-load layer on plastic row water body, makes bituminous mixture embed in the upper strata grid of plastic draining grid.

5. the construction method of a kind of bridge deck pavement drainage tack coat according to claim 4, is characterized in that, the binding material described in second step adopts mulseal or heated bitumen, and consumption is pitch 0.5 ~ 1.5kg/m ²if when binding material is mulseal, plastic row water body must be laid after pitch breakdown of emulsion to be emulsified; If binding material is heated bitumen, after heated bitumen spread, plastic row water body should be laid in 10min.

6. the construction method of a kind of bridge deck pavement drainage tack coat according to claim 4, is characterized in that, fine aggregate described in the 3rd step requires washing screening, and wherein below 0.075mm granule content is not more than 0.5%.