JPH0380088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a concrete mixing device to resist wear. More specifically, the present invention relates to a method for constructing abrasion-resistant parts of concrete mixing equipment that are particularly susceptible to abrasion damage due to contact with fresh concrete.

The walls of concrete mixing equipment suffer significant abrasion and damage due to contact with fresh concrete, and improvement of this problem is strongly desired. In particular, the concrete mixing equipment installed on concrete mixer trucks has a high operating rate, and
Because the amount of fresh concrete loaded and transported per cycle is usually about 10 tons, the parts that come into contact with the fresh concrete, for example,
The wear and tear of the hopper, drum, chute, and blades were significant, and their durability was a major problem in the industry. In particular, wear and tear of the hopper and chute due to contact with fresh concrete is noticeable, and improvements in this respect are strongly desired.

In addition, fresh concrete adhering to the walls of concrete mixing equipment must be thoroughly cleaned and removed before it solidifies, resulting in problems such as rusting in addition to a decrease in work efficiency.

In order to avoid these problems, for example, a method of attaching a rubber sheet to the wall surface of a concrete mixing device using bolts or the like has been used. However, although this method improves wear resistance, fresh concrete tends to adhere to the bolt head, and problems such as cleaning and removal of this and the resulting rusting have not been solved. There was also the problem that the rubber sheet was easily damaged when cleaning and removing concrete.

As a result of intensive studies on how to solve these problems, the inventors of the present invention pasted a sheet molded from a two-component urethane resin material to the parts of the concrete mixing device that are prone to wear and damage due to contact with fresh concrete. The inventors have found that the various problems described above can be solved by doing so, and have completed the present invention.

That is, the present invention applies a primer to the wall surface of a concrete mixing device, and then molds a sheet from a two-component urethane resin material to a thixotropic two-component urethane resin material that can be integrated with the sheet after curing. The present invention provides a method for constructing a concrete mixing device with wear resistance, which is characterized by applying a material onto a primer layer and then pasting the material.

The method of the invention is particularly advantageously applied to concrete mixing equipment arranged and mounted on concrete mixer trucks, usually consisting of a hopper, drum, blades and chute, in which abrasion damage caused by contact with fresh concrete is significantly improved, and The adhesion of ready-mixed concrete is significantly improved, and even if the attached ready-mixed concrete sticks, it can be easily peeled off, so the decrease in workability due to washing and removal is improved and the problem of rusting is avoided.

The construction method of the present invention will be explained in detail below.

The primer used in the present invention is not particularly limited, and may be any known one-component or two-component primer, but preferably has good adhesion to the surface of the concrete mixing device and is thixotropic. A material with excellent interlayer adhesion with the two-component urethane resin material is preferable. Examples include a two-component epoxy resin primer, a one-component moisture-curing urethane resin primer, a modified silicone primer, and a phenoxy resin primer. The amount of these primers to be applied is not particularly limited, but is usually about 30 to 500 g/m ² .

The two-component urethane resin material used to form the sheet in the method of the present invention is not particularly limited, and various commercially available materials can be used. For example, as the main component, tolylene diisocyanate, phenylene diisocyanate, naphthalene diisocyanate, their dimers or trimers, or those obtained by reacting with polyhydric alcohols, polyether polyols, polyester polyols, etc. A curing agent containing a polyisocyanate compound, and a curing agent containing a polyamine compound or a polyol compound as a main component is used. The two-component urethane resin material preferably has a Shore A hardness of 60 or more when formed into a sheet;
If it is less than this, durability tends to decrease due to decrease in hardness, which is not preferable. The sheet is formed by a known method such as injection molding, but it is preferable to have a plurality of through-holes because stronger adhesion can be obtained. The thickness of the sheet is preferably 1 to 10 mm. Further, the diameter of the through holes is preferably 8 to 15 mm, and the interval between the through holes is preferably 3 to 15 cm. In addition, the method for making the through-holes is to drill the holes after forming the sheet, or to pre-protrude a shaped object such as a cylindrical object on the mother mold for the holes during molding, and then release the mold after forming the sheet. A known method is employed.

The thixotropic two-component urethane resin material used in the present invention, which can be integrated with the sheet after curing, is a two-component urethane resin material that has been made thixotropic by a known method, such as adding a thixotropic agent such as colloidal silica. The molded urethane resin material is preferably a two-component urethane resin material used to mold the sheet with a thixotropy imparting agent added thereto.

Such thixotropic two-component urethane resin material has a thixotropy during use of 1 mm to 10 mm as the adhesion thickness on vertical surfaces.
Preferably, it is mm.

To carry out the method of the present invention, first, a primer is applied to the area to be constructed by a known application method such as troweling, brushing, or roller brushing. After the primer is semi-cured or hardened, the main ingredient and curing agent of the thixotropic two-component urethane resin material are sufficiently stirred and mixed at a predetermined ratio.
Apply approximately 1 to 5 mm with a spatula, etc. Next, while the thixotropic two-component urethane resin material is uncured, a sheet formed from the two-component urethane resin material is pressed and pasted. The thixotropic two-component urethane resin material that is extruded into the joints of the sheets and the through holes of the sheets during crimping is smoothed using a spatula or the like before it hardens.

According to the method of the present invention, the abrasion resistance of the parts of the concrete mixing device that are easily damaged by abrasion due to contact with fresh concrete is improved, the adhesion of fresh concrete is prevented, and even if it does adhere, it can be easily removed. Furthermore, it is sufficient to repair damaged areas due to long-term use by simply applying a two-component urethane resin coating material to the area.

In addition, since the method of the present invention uses a pre-formed sheet, the construction thickness can be controlled accurately and easily.
Workability is improved, and by using thixotropic urethane as an adhesive and providing through holes in the sheet, troubles caused by air being trapped between the sheet and the substrate can be prevented, and furthermore, the sheet itself It has many advantages, such as the ability to obtain a wear-resistant lining layer with excellent physical properties because the conditions for its preparation can be strictly controlled and used as desired.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Primer 310 (Sumitomo Chemical Co., Ltd. product, epoxy resin primer) was applied to the inner surface of the chute of a concrete mixer truck with a length of 7.7 m, a width of 2.5 m, and a height of 3.5 m.
It was applied with a brush at a rate of 200 gr/m ² .

After curing of Primer 310, Sumikadyne F310
(Sumitomo Chemical product, two-component urethane resin material)
100 and Aerosil #200 (Japan Aerosil company product,
Thoroughly mix 10 parts of colloidal silica to prepare a thixotropic two-component urethane resin material with an average thickness of 1
Immediately, a 2 mm thick urethane sheet prepared separately using Sumikadyne F310 (the above-mentioned two-component urethane) was attached and cured for 3 days at room temperature. Some small bubbles were observed within the sheet.

When we loaded a concrete mixer truck with wear-resistant construction on the chute and operated it with about 10 tons of ready-mixed concrete per run, there was only slight wear observed until about 160 runs, but after that, air bubbles gradually appeared. Localized peeling was observed due to wear and tear.

Example 2 A urethane sheet that was the same as that used in Example 1 with through holes of 5 mm in diameter made at intervals of about 6 cm both vertically and horizontally was pasted on the inner surface of the chute of a concrete mixer truck in the same manner as in Example 1. Wearing. A clean sheet surface could be obtained without leaving any air bubbles.

When a wear resistance test was conducted in the same manner as in Example 1, 200
Even after several operations (approximately 3 months), no damage due to fresh concrete adhesion or wear was observed on the chute.

Comparative Example 1 Sumikadyne F310 (described above) was used instead of the thixotropic two-component urethane used as the adhesive in Example 1.
A test was carried out in the same manner as in Example 1, except that only a chisel was used, but the wear was withstood until about 100 operations, but after that, the large amount of large bubbles left behind when the urethane sheet was attached showed wear and tear. Proceeded.

Comparative Example 2 A hard rubber sheet with a thickness of 2 mm was adhered to the inner surface of the chute of a concrete mixer truck of the same type as in Example 1 with rubber glue, and the same test as in Example 1 was conducted, but the sheet wore quickly and suffered from severe tearing and peeling. After 70 cycles, rust was observed on the base surface.

Claims (1)

[Claims] 1. A thixotropic two-component urethane resin obtained by applying a primer to the wall surface of a concrete mixing device, and then integrating a sheet formed from a two-component urethane resin material with the sheet after curing. A wear-resistant construction method for concrete mixing equipment, characterized by applying a base material on a primer layer and then pasting it. 2. A method for constructing a concrete mixing device with wear resistance according to claim 1, wherein the sheet has a plurality of through holes. 3. The abrasion-resistant construction method for a concrete mixing device according to claim 2, wherein the sheet has a Shore A hardness of 60 or more.