JPH04277202A - Pavement body having water-proof layer - Google Patents

Abstract

PURPOSE:To protect a subbase course roadbed from infiltration of rain water in a rainfall by providing a water-proof layer between a drainage asphalt mix ture and lower layer asphalt mixture to drain on the surface thereof. CONSTITUTION:After existing pavement in cut by about 4-5cm, a solvent type adhesive material containing an asphalt rubber used as a road bridge reinforced concrete floor plate water-proof agent is scattered by about 0.4l/m<2>. Next, after asphalt coating film heating type water-proof material is scattered by about 1.2-2.0kg/m<2> at a time on the water-proof material, drying sand is uniformly scattered by about 1.0kg/m<2> and a drainage mixture is paved thereon, so that the existing pavement can be repaired into drainage pavement.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to high-grade pavement, simple pavement,
Regarding pavements with waterproof layers for bridge surface pavements, elevated pavements, airport pavements, etc.

0002

BACKGROUND OF THE INVENTION In recent asphalt pavements, open-grain type drainage pavements have been put into practical use. This drainage pavement improves visibility during rain, suppresses hydroplaning, and suppresses water splashing, thereby ensuring vehicle driving safety. Its feature is that it has a sound-absorbing effect that absorbs noise during driving at the location where it is generated. Paving that exhibits such performance uses an asphalt mixture with a high porosity in the surface layer, and has a structure in which rainwater permeates through the surface layer and drains at the base layer surface. However, in most conventional pavement structures, impermeable asphalt mixtures (such as dense-grained asphalt mixtures, fine-grained asphalt mixtures, and dense-grained gap asphalt mixtures) are used on top of the base layer. The idea is to drain rainwater from the surface of the road using the cross slope. The current method of constructing drainage pavement is to cut the existing pavement, install drainage structures, and then pave the drainage mixture. In addition, in the case of new construction, a drainage mixture is paved on top of the base layer. However, when cutting existing pavement, a coarse-grained asphalt mixture is generally revealed when cutting to the surface of the base layer mixture. Coarse-grained asphalt mixtures themselves are less water-impermeable than asphalt mixtures for surface layers, so rainwater permeates through the surface layer, or if cracks occur in the surface layer, more rainwater permeates into the roadbed and subgrade. Under these conditions, if a drainage mixture is paved, rainwater will permeate into the subgrade and subgrade during rainfall, increasing the moisture content of the subgrade and subgrade, causing a decrease in supporting strength. It is possible that the pavement itself will be destroyed during service.

0003

[Problem to be solved by the invention] The problem to be solved is that rainwater during rainfall permeates through the drainage pavement, reaches the base surface, and then penetrates into the roadbed and subgrade, supporting the subgrade and subgrade. This is the point where strength and durability are reduced.

0004

[Means for Solving the Problems] The present invention realizes drainage on the surface of the waterproof layer by providing a waterproof layer with excellent waterproof properties between the drainable asphalt mixture and the lower asphalt mixture layer.

[0005]

[Embodiment] An embodiment of the present invention will be described below. A waterproof layer is provided between the drainage asphalt mixture and the base asphalt mixture layer, and the following waterproof material is used as the waterproof layer. (1) Sheet-based waterproofing layer, paint film-based waterproofing layer (synthetic rubber-based - solvent type, asphalt-based - heated type) according to the Japan Road Association's "Road Bridge Reinforced Concrete Slab Waterproofing Layer Design and Construction Materials" , epoxy resin-based (two-component type) and pavement-based waterproofing materials. (2) Asphalt emulsion, rubber-containing asphalt emulsion, resin-containing asphalt emulsion, cut-back asphalt, cut-back rubber-containing asphalt, cut-back resin-containing asphalt, cut-back resin used in general road surface treatment materials・Rubber-containing asphalt, cut-back filler-containing asphalt, straight asphalt, blown asphalt, rubber-containing asphalt, resin-containing asphalt, rubber/resin-containing asphalt, filler-containing asphalt, powdered rubber/resin-containing asphalt, powder Paving materials such as rubber, rubber-containing asphalt, powdered rubber, resin, rubber-containing asphalt tar, etc. (3) Among those used as general road paving materials, the asphalt mixture has no or almost no voids and has a small maximum aggregate particle size that can be applied in a thin layer. It may also be one using modified asphalt or the like.

An example of construction will be explained below. (1) When targeting existing pavement, 4 to 5
After cutting cm (according to the design), the road bridge reinforced concrete
Spray 0.4 l/m2 of asphalt-based rubber-containing solvent-based adhesive used as waterproofing material for floor slabs, and apply 1.2 to 2.0 kg of asphalt coating-based heated waterproofing material at once.
g/m2 After spreading, dry sand is uniformly spread at 1.0 kg/m2, and then the drainage mixture is paved. (2) In the case of existing pavement In addition to the above, the existing pavement should be 4 to 5 c.
m (according to the design), and after spraying 2.0 to 4.0 kg/m2 of the powdered rubber/rubber-containing asphalt-based heated surface treatment material used for the surface treatment material, 1.0 kg/m2 of dry sand was applied.
Spread 0 kg/m2 uniformly and then pave the drainage mixture. (3) When targeting new pavement, apply the asphalt mixture for the base layer and then apply 0.4 asphalt emulsion.
Spread l/m2 and spread 2cm of goose asphalt mixture.
Paving to a thickness of 100 mL and then applying a drainage mixture.

[0007]

Effects of the Invention According to the present invention described in detail above, by providing a waterproof layer between the drainable asphalt mixture and the lower asphalt mixture layer, water can be drained on the surface of the waterproof layer. It has the effect of preventing water from penetrating into the floor and roadbed, preventing a decline in the support strength of the roadbed and roadbed under the repeated loads of traffic, and increasing durability.

Claims (1)

[Claims] 1. A pavement body having a waterproof layer, characterized in that the waterproof layer is provided between a drainable asphalt mixture and a lower layer asphalt mixture, and water is drained on the surface of the waterproof layer.