JP2002186930A - Treatment method of joint portion of water-barrier layers consisting of asphalt compound and asphalt tape to be applied therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to perform a simple and secure water-adhesion joint between asphalt mixtures which are divisionally constructed, and provide a treatment method of joint portion of water barrier layers consisting of asphalt mixtures with high construction reliability. SOLUTION: This is a construction method to form a water-barrier layer through divisional application of asphalt mixtures 20 comprising asphalt and aggregates on the ground surface of the waste material disposal place and the surface of general roadbeds. The method comprises a tape pasting procedure that pastes a strip-type asphalt tape 27 onto the edge face 25a of an asphalt mixture 25 applied previously while this tape is being heated, and a water- adhesion joint procedure which performs water-adhesion joint of an asphalt mixture 28 applied later and asphalt mixtures 25 applied previously through applying the asphalt mixtures 28 applied later onto the surface of the asphalt tape 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an impermeable layer of an asphalt mixture for impermeable treatment on a waste disposal site, a reservoir, or a general road surface, and more particularly, to an asphalt constructed in a regionally divided manner. The present invention relates to a method for treating a joint between mixtures.

[0002]

2. Description of the Related Art For example, landfill-type waste disposal sites for dumping industrial waste and general waste are disposed in a concave ground formed by utilizing natural terrain or excavating the ground. It is to be reclaimed and stored. In order to prevent environmental pollution caused by sewage leaching from the waste landfilled at this waste disposal site penetrating into the basement, it is mandatory to implement water-blocking work in advance on the bottom ground surface of the disposal site. Have been. In recent years, when environmental issues have been discussed, it can be said that the above-mentioned measures to block water are key to the success or failure of the construction of the repository.

[0003] Conventionally, from the viewpoints of economy and water-blocking, the water-blocking works are provided with water-blocking by, for example, laying a soft synthetic resin-based or rubber-based water-blocking sheet, It is known that a bottom layer of a landfill is covered with an asphalt mixture to form an impermeable layer. In particular, the method of laying an asphalt mixture to form a water barrier layer has often been adopted from the viewpoint of workability and cost. When laying the asphalt mixture, it is often difficult to perform the compaction work by laying and leveling on the ground of the vast disposal site at a stretch, for example, after tapering the end face of the pre-constructed predetermined area Split construction in which the asphalt mixture of the construction is appropriately overlapped and joined has been implemented.

[0004]

The above-mentioned asphalt mixture divisional construction involves a construction which tends to cause water leakage if the post-construction asphalt mixture is joined within a time period in which the pre-construction asphalt mixture is kept at a sufficiently high temperature. It is considered that the occurrence of joints is small. However, as the construction area becomes larger on a construction site, the frequency of the division work of the asphalt mixture increases, and it becomes difficult to perform the post-construction within a time when the pre-construction asphalt mixture does not reach room temperature. Therefore, even if the pre-construction asphalt mixture is cooled and cooled to room temperature, even if the post-construction asphalt mixture is applied, the joint surface between the pre-construction and post-construction is not completely welded, and there is a possibility of forming a water conveyance path naturally. Is high.
In addition, it is considered to insert a waterproof material such as rubber material into the joint surface between the pre-constructed asphalt mixture and the post-constructed asphalt mixture.However, water-tight joining between each asphalt mixture and the waterproof material itself is secured. I'm suspicious,
The construction reliability was poor.

Accordingly, the present invention has been made in view of such a conventional problem, and it is possible to simply and surely perform water-tight joining between asphalt mixtures to be divided and constructed, and to provide a water shielding made of an asphalt mixture having excellent construction reliability. It is an object of the present invention to provide a method for treating a layer joint.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a first invention is to provide an asphalt mixture composed of asphalt and aggregate on a surface of a waste disposal area or a general roadbed. It is a construction method of forming a water-blocking layer by dividing construction, a tape application procedure of applying an asphalt tape made of a band-shaped asphalt material to the end face of the pre-applied asphalt mixture while heating, and a tape application procedure, A watertight joining procedure for performing watertight joining between the postprocessed asphalt mixture and the preprocessed asphalt mixture by applying the postprocessed asphalt mixture.

[0007] Before asphalt mixture is applied to the surface of the asphalt tape, the asphalt tape may be reheated and applied.

According to a second aspect of the present invention, there is provided an asphalt tape used in the method for treating a joint according to the first aspect, wherein an asphalt material having an affinity for an asphalt mixture is formed into a belt shape. .

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of a waste disposal site to which the joint processing method of the present invention is applied. If the stage of the description in this embodiment is, for example, a waste disposal site, a water shielding work using an asphalt mixture is performed on the bottom surface of the waste disposal site 11. The water-blocking structure 10 here is not based on the asphalt mixture alone, but also uses another water-blocking layer. The area where the water-blocking structure 10 is provided is an area that covers the entire bottom ground 12 including the slope of the waste disposal site 11.

[0010] The water blocking structure 1 according to this embodiment.
Numeral 0 denotes a crushed stone mixed layer 15 laid as covering the bottom ground 12 as a supporting force-oriented layer, and an asphalt mixture layer 14 laid on the upper surface of the crushed stone mixed layer 15 and also serving as a water-impervious layer and a deformation following layer. According to this embodiment, the impermeable sheet 13 is further provided so as to cover the upper surface of the asphalt mixture layer 14. The crushed stone mixed layer 15 is mainly formed by mixing crushed stones and sand, and for example, is prepared by using a bulldozer or the like.
It is rolled out with a thickness of 5 cm or more, compacted and compacted, and crushed stone or sand, which is a material that exerts a supporting force, is mixed, so that sufficient supporting force against landfill load etc. can be obtained .

On the other hand, the asphalt mixture layer 14 is provided with a water-blocking pavement material, that is, an asphalt mixture. This asphalt mixture is composed of, for example, asphalt such as straight asphalt or modified asphalt, fine aggregate such as crushed stone or blast furnace slag (eg, granulated with a maximum particle size), fine aggregate such as sand, and filler such as lime powder. Consists of materials. At the time of laying work, this asphalt mixture is sufficiently mixed in an asphalt plant, and then heated to, for example, about 180 degrees, rolled out to a predetermined thickness with fluidity and viscosity, and tightened by a heavy machine such as a road roller. It exhibits sufficient water shielding by being subjected to compaction and compaction rolling.

FIG. 2 is an explanatory view showing a construction state in which the asphalt tape attached to the end face of the pre-construction asphalt mixture is joined while melting the asphalt mixture after the construction, and FIG. It is explanatory drawing which shows an implementation process.

[0013] Next, the construction situation when the present invention is actually applied to perform the joint processing of the asphalt mixture will be examined.
Construction equipment 2 used for laying asphalt mixture 20
1 is equipped with a self-propelled device that enables its own movement,
In addition, an emulsion tank for storing and measuring asphalt emulsion and a water tank for storing and measuring water essential for mixing are provided, followed by a crushed stone hopper for storing and measuring crushed stone mixed into the slurry material. I have.

A mixer 21a for kneading various kinds of mixed materials supplied from the above-mentioned tanks is provided at the rear end of the apparatus 21, and an additive tank for supplying various additives is provided in addition to the mixer 21a. Also, this mixer 21
A spreader mechanism 21b is provided to spread the asphalt mixture 20 supplied from a.

In the construction procedure, first, the above-mentioned various materials are sufficiently loaded on the hopper of the construction apparatus 21 and moved to the construction area. The construction area is, for example, an unlaid area 26 adjacent to the pre-construction asphalt mixture 25 in which the construction has been completed by the previous day. Next, the asphalt mixture 20 to be laid is spread over the unlaid area 26 while being appropriately stirred by the screw spreader 21b. The side end face 25a of the pre-constructed asphalt mixture 25 has a tapered cross section.
7 is already attached (see FIG. 3). The application of the asphalt tape may be completed in advance when the pre-constructed asphalt mixture is laid, or may be performed as a parallel operation immediately before the laying of the post-constructed asphalt mixture. The attaching method may be performed manually using a torch or the like, or a dedicated attaching device provided with a heating mechanism may be used.

The asphalt tape is formed by molding an asphalt material having an affinity for the asphalt mixture into a belt shape, and has a property of being melted by heating with a torch or a burner. The construction apparatus 21 in the present embodiment spreads the asphalt mixture 20 by the spreader mechanism 21b, while melting the asphalt tape 27 in the area immediately before the construction by the heating burner 21c. The asphalt tape 27 fills and smoothes the surface irregularities of the side end face 25a of the pre-constructed asphalt mixture 25 at the time of the application, and is liquefied by a melting operation to be joined to the post-construction asphalt mixture 20.
(Hereinafter, the post-processed asphalt mixture 28) is also entangled and tied to the end face of the post-processed asphalt mixture 28 to water-tightly join the pre-processed asphalt mixture 25 and the post-processed asphalt mixture 28. In this way, the pre-constructed asphalt mixture 25 and the post-constructed asphalt mixture 28 are subjected to a water-tight joining process, and the passage of time after the construction has passed and the pre-constructed asphalt mixture 25 has been cooled to room temperature without any water barrier problem. The post-work asphalt mixture 28 is joined.

[0017]

As described above in detail, the method for treating a joint of a water-impervious layer comprising an asphalt mixture according to the present invention comprises:
This is a construction method in which an asphalt mixture composed of asphalt and aggregate is divided and applied on the surface of a waste disposal area or on a general roadbed to form a water barrier layer, and a belt-like asphalt material is applied to the end face of the pre-constructed asphalt mixture. A tape application procedure for applying the asphalt tape while heating the asphalt tape, and a water-tight joining procedure for performing water-tight joining between the post-construction asphalt mixture and the pre-construction asphalt mixture by constructing the post-construction asphalt mixture on the surface of the asphalt tape. It is characterized by having.

Therefore, according to the present invention, when dividing the asphalt mixture, the pre-construction asphalt mixture is cooled and cooled to room temperature, and then the post-construction asphalt mixture is applied. The surface will be completely welded with the liquefied asphalt tape, where it will be completely watertight.
Of course, since post-processing is carried out while checking the melting condition of the asphalt tape, it can be said that this is an excellent construction method from the viewpoint of water-tightness control, assuring reliable water-tight joining.

Thus, it is possible to provide a method for treating a joint of a water-blocking layer made of an asphalt mixture excellent in construction reliability, which enables simple and reliable water-tight joining between asphalt mixtures to be divided and constructed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a waste disposal site to which a joint processing method of the present invention is applied.

FIG. 2 is an explanatory diagram showing a construction situation in which a post-construction asphalt mixture is joined while melting an asphalt tape stuck on an end face of a pre-construction asphalt mixture.

FIG. 3 is an explanatory diagram showing an implementation process of a joint processing method of the present invention.

[Explanation of symbols]

 Reference Signs List 20 asphalt mixture 25 pre-construction asphalt mixture 25a pre-construction asphalt mixture (side) end face 27 asphalt tape 28 post-construction asphalt mixture

Claims (2)

[Claims] 1. A method of forming an impermeable layer by dividing an asphalt mixture composed of asphalt and an aggregate on a surface of a waste disposal area or on a general roadbed, wherein an end face of a pre-constructed asphalt mixture is provided. A tape application procedure of applying an asphalt tape made of a strip-shaped asphalt material to the tape while applying the post-application asphalt mixture to the surface of the asphalt tape, thereby performing watertight bonding between the post-application asphalt mixture and the pre-application asphalt mixture. And performing a watertight bonding procedure. 2. An asphalt tape used in the method for treating a joint portion according to claim 1, wherein an asphalt material having an affinity for an asphalt mixture is molded into a belt shape.