JPH04258402A - Executing method of thickness-measurable pavement facility and measuring method of thickness of pavement of pavement facility - Google Patents

Abstract

PURPOSE:To measure the thickness of a layer formed in the sectional direction without breaking a pavement facility when the pavement facility is constructed on a road, etc. CONSTITUTION:Substances having different dielectric constants such as iron powder, aluminum powder or the like and asphalt concrete or cement concrete are scattered on the underside boundary surface of a layer, pavement thickness of which must be measured, in each layer formed in the sectional direction of a pavement facility in the construction process of the pavement facility. A layer just above the layer is constructed, electromagnetic waves are radiated, and layer thickness is measured by the reflection of electromagnetic waves.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is a method for measuring the thickness of a layer formed in the cross-sectional direction when constructing a paving facility such as a road without destroying the paving facility. The present invention relates to a method for constructing a measurable pavement facility and a method for measuring the pavement thickness of a pavement facility.

0002

[Prior art and its problems] In paving facilities such as paved roads, it is necessary to confirm whether the pavement is paved with the designed thickness in each layer. . For this reason, the commonly used method is
After the paving work was completed, the cores extending below the pavement surface were cut out or holes were drilled in the roadbed, and the thickness of each layer indicated in the cores or holes was measured.

[0003] However, this method of collecting cores and drilling holes not only takes time and is complicated to collect cores and drill holes; Drilling a hole or hole means destroying a part of the paving facility, which has the problem of causing a decrease in the strength of the paving facility.

0004

[Means for Solving the Problems] Therefore, in order to solve the above-mentioned problems, the method for constructing a pavement facility whose thickness can be measured and the method for measuring the pavement thickness of a pavement facility according to the present invention are designed to solve the above-mentioned problems. During the construction process of this pavement facility, a substance with a dielectric constant different from asphalt concrete or cement concrete, such as iron powder or aluminum powder, is sprayed on the lower boundary surface of the layer whose pavement thickness needs to be measured. Then, after constructing the layer directly above it, it emits electromagnetic waves,
By measuring the layer thickness based on the reflection, it is possible to measure the layer thickness without destroying the paving facility.

[0005]

[Embodiment] Next, an embodiment of a method for constructing a paving facility whose thickness can be measured and a method for measuring the pavement thickness of a paving facility according to the present invention will be described, taking a road as an example. There are two types of road pavement: asphalt pavement and cement concrete pavement.The former is constructed and constructed in the order of, for example, the subgrade, lower subgrade, upper subbase, base layer, and surface layer, while the latter is constructed in the order of the subgrade, subbase, upper subbase, base layer, and surface layer. The construction is carried out in the following order: roadbed, upper roadbed and concrete slab. Therefore, in any pavement, a plurality of layers are formed in the cross-sectional direction.

[0006] When paving these roads, it is necessary to check whether each of the above-mentioned layers has the thickness as designed. On the bottom surface, in other words,
A substance having a dielectric constant different from that of the asphalt concrete or cement concrete is sprayed on the upper surface of the layer that has already been paved before the layer is constructed.

Examples of the substances having different dielectric constants include iron or aluminum, and iron or aluminum powder is used alone or in asphalt emulsions, lime solutions, and asphalt in which powders of iron or aluminum are conventionally sprinkled on the interfaces of the respective layers. Spray it mixed with a type of adhesive or asphalt sheet.

[0008] After this dispersion is completed, a layer immediately above it is constructed, and when the construction is completed, electromagnetic waves are radiated onto the paving surface. The emitted electromagnetic waves penetrate into the layer, and when they reach the iron powder or aluminum powder, they are reflected, and this is used to measure the thickness of this layer.

[0009] The device for emitting electromagnetic waves used here is a radar, and a specific example thereof is, for example, the product name ``RC Radar JEJ-60'' manufactured by Japan Radio Co., Ltd.
There is "A".

[0010] The above measurements are performed in order from the bottom layer during construction, but even if the iron powder or aluminum powder is present in each layer, the emitted electromagnetic waves are always reflected only to the top layer. Because of this, the thickness of each layer can always be measured reliably.

<Experimental Examples> Experimental examples conducted by the present inventor are as follows. Note that the radar used here is the one described above. Moreover, the thickness of the layer was set to 5 cm.

1. When only iron powder is sprayed, the amount of spraying is 0 to 0.6 kg/m2, unmeasurable 0.7 to 1
．． 0kg/m2 Measurable but the measured value is not constant 1.1kg/m2 or more Measurable well 2. When iron powder mixed with asphalt emulsion is sprayed (the following values are 0.4 liters) /m2
(Amount of iron powder mixed into asphalt emulsion) 0 to 1.6
kg/liter Unmeasurable 1.7 to 2.5 kg/liter Measurable, but the measured value is inconsistent 2.6 kg/liter or more Can be measured well

[0013]

Effects of the Invention As described above, according to the method for constructing a pavement facility whose thickness can be measured and the method for measuring the pavement thickness of a pavement facility according to the present invention, among the layers formed in the cross-sectional direction of the pavement facility,
During the construction process of this pavement facility, iron powder or aluminum powder, etc.
After spreading a material with a dielectric constant different from asphalt concrete or cement concrete and constructing a layer directly above it, electromagnetic waves are emitted and the layer thickness is measured by the reflection, so it is easy and accurate to do so without destroying the paving facility. This has the effect of being measurable.

Claims (2)

[Claims] Claim 1: Among the layers formed in the cross-sectional direction of the pavement facility, iron powder, aluminum powder, etc. A method for constructing a pavement facility whose thickness can be measured, characterized by spraying a material having a dielectric constant different from that of concrete or cement concrete. Claim 2: Among the layers formed in the cross-sectional direction of the pavement facility, asphalt such as iron powder or aluminum powder is applied to the lower boundary surface of the layer whose pavement thickness needs to be measured during the construction process of the pavement facility. A method for measuring pavement thickness of paving facilities, which comprises: spreading a material having a dielectric constant different from that of concrete or cement concrete; constructing a layer directly above the concrete; emitting electromagnetic waves; and measuring the layer thickness by reflecting the electromagnetic waves.