JPH0213120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hardening agent composition for use in fixing materials for fixing anchor bolts to rock, concrete structures, etc.

In order to reinforce rock in tunnels, mines, etc., or to reinforce structures such as concrete, or to attach equipment, a hole is drilled in the rock or structure, and a cartridge containing a fixing material and a hardening agent is loaded into the hole. Then, the anchor bolt is inserted, the cartridge is broken, and the fixing material and hardening material are brought into mixed contact with each other to harden the fixing material and fix the anchor bolt in the borehole.

The combinations of the fixing agent and hardening agent contained in the cartridge are broadly classified into combinations of cement and water and combinations of synthetic resin and a hardening agent such as organic peroxide. A combination of a synthetic resin and a curing agent has the advantage of being workable at low temperatures.

The present invention relates to the latter curing agent composition for a bonding material, and conventionally a cartridge containing a bonding material and a curing agent is constructed as shown in FIGS. 1 and 2. That is, 1a and 1b are cartridge containers, the former being made of a glass tube and the latter being made of a soft resin bag, and 3a and 3b being synthetic resins as fixing materials, unsaturated polyester resin, epoxy resin, and polyurethane resin are used, respectively. 4a and 4b are aggregates,
5a and 5b are hardening agents, and 6a and 6b are hardening agent storage tubes that accommodate the hardening agents 5a and 5b, respectively.
2a and 2b are cartridge container enclosures, and 2a
is a cap, and 2b is a clip.

However, from the viewpoint of performance and cost, solid organic peroxides such as benzoyl peroxide are used as curing agents in this case. Solid organic peroxides are dangerous, impact,
It was sensitive to friction and was extremely difficult to handle.

In order to eliminate this drawback, there is a method of diluting benzoyl peroxide with a powder that is inert to organic peroxides (Japanese Patent Publication No. 48-41181), and a method of mixing benzoyl peroxide with clay and water in the form of a kneading rod (Japanese Patent Publication No. 48-41181). Publication No. 48-37934) has been proposed.

In the former method, it is difficult to contain the powder in a close-packed state, and the powder is unevenly distributed due to vibrations during transportation.
As a result, the reaction between the curing agent and the fixing material is not uniform, resulting in a situation where the anchor bolt is not sufficiently fixed. In the latter method, the curing agent becomes hard and requires longer stirring time than powder when used in the field.
In addition, the curing agent is often insufficiently dispersed, resulting in poor curing.

The inventors of the present invention conducted research to provide a curing agent composition for anchor bolt fixing materials that eliminates these drawbacks. By adding water to the material to form a slurry, and then mixing in this paste with microscopic hollow bodies made of a substance that does not react with organic peroxides, the hardening agent can be easily and safely stored in the hardening agent storage tube. If necessary, the curing agent can be transported by pump, and the curing agent will not be unevenly distributed or caked in the curing agent storage pipe due to vibration of the transport pipe.
Additionally, we have obtained the knowledge that the reaction with the synthetic resin can proceed smoothly, and that the curing agent storage tube will not be destroyed even after repeated freezing and thawing, and the adhesive ability of the adhesive will not deteriorate. I have completed my invention.

The gist of the present invention is to store a synthetic resin as a bonding material and its curing agent composition in a cartridge so that they do not come into contact with each other, and when necessary, bring the two into contact to cure the synthetic resin and fix the anchor bolt. The agent composition is characterized in that it is a mixture of powdered organic peroxide, water and the organic peroxide, and a hollow body made of a substance that does not react with the synthetic resin, or a filler is added to a mixture thereof. This is a curing agent composition for anchor bolt fixing material.

Examples of the synthetic resin used in the present invention include unsaturated polyester resin, epoxy resin, and polyurethane resin.

Examples of powdered organic peroxides include benzoyl peroxide, metatolyl peroxide,
Examples include dicumyl peroxide, 2,4 dichlorobenzoyl peroxide, lauroyl peroxide, di-tertyabutyl diperoxyisophthalate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, and the like.

Examples of substances that are inert to organic peroxides include glass, silica, shirasu, phenolic resin, polyvinylidene chloride, etc., and general commercially available products can be used for micro hollow bodies manufactured from these substances. .

The amount of micro hollow bodies to be added is not particularly limited, and effects can be obtained depending on the amount of addition, but it is preferable that the micro hollow bodies be contained in the curing agent composition in an amount of 0.1% to 20% by weight. If it is less than 0.1% by weight, there is a risk that the tube containing the curing agent will be destroyed by freezing and thawing the cartridge. Furthermore, if the content of micro hollow bodies exceeds 20% by weight, the amount of organic peroxide stored in the curing agent storage tube will decrease, making it impossible to obtain a practical curing effect. A part of the micro hollow bodies can be replaced with powdered calcium carbonate, talf, clay, etc.

The optimum amount of water to be added to the curing agent composition varies depending on the type of organic peroxide used and the type and amount of hollow micro bodies used.
The amount of the composition obtained by mixing water and micro hollow bodies, etc., is so that it can be transferred by a pump, is soft enough to be injected into the curing agent storage tube, and hard enough that it does not flow out from the tube. Preferably, the amount is 20% to 80% by weight based on the curing agent composition.

FIG. 3 shows a cartridge loaded with a storage tube for a curing agent composition for anchor bolt fixing material according to an embodiment of the present invention, 1 is a cartridge container, and 2 is an enclosure for the cartridge container, which is a clip, a cap, etc. It will be done. Numeral 3 is a synthetic resin as a fixing material, and an appropriate amount of aggregate 4 is mixed therein. Powdered organic peroxide 5 as a hardening agent is made into a paste together with an appropriate amount of water, a micro hollow body 7 and, if necessary, a filler, and charged into a hardening agent storage pipe 6, and the resulting hardening agent storage pipe The cartridge is sealed at both ends with a cap or the like, and is buried in a fixing material inside the cartridge.

Since the curing agent composition for anchor bolt fastening materials of the present invention is configured as described above, even if it is repeatedly frozen and thawed, the freezing expansion pressure of water is absorbed into the hollow part of the micro hollow bodies contained therein. Powdered organic peroxide can be safely and easily handled without destroying the curing agent storage tube or reducing its curing ability.

Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto.

Example 1 100 parts by weight of a commercially available benzoyl peroxide diluted with 25% water (trade name Nyper BW manufactured by Nippon Oil & Fats Co., Ltd.), 350 parts by weight of finely divided calcium carbonate, 10 parts by weight of phenolic resin micro hollow bodies, and 120 parts by weight of water were mixed. ,
A paste-like peroxide mixture was obtained. The paste-like peroxide was pressurized into a glass tube with an inner diameter of 10 mm and a flow width of 48 mm with both ends open using a gear pump. Polyethylene caps were provided at both ends of the tube, the hardening agent mixture adhering to the outside of the tube was washed with water, and a tube was prepared in which the hardening agent was charged. On the other hand, 100 parts by weight of commercially available unsaturated polyester resin (acid value 30), 70 parts by weight of finely powdered calcium carbonate, 30 parts by weight of Yakisekou, diethylaniline.
A fixing material was prepared by mixing 0.4 parts by weight. The obtained adhesive material was placed in a cartridge made of a polyethylene/polyamide/polyethylene three-layer laminate film having a diameter of 32 mm, a length of 50 cm, and a thickness of 87 microns, and then the tube containing the curing agent composition was placed in the adhesive material. After burying the cartridge in the water, we used clips to secure both ends of the cartridge to create a cartridge.

This cartridge was subjected to vibrations of 15Hz±2G using a vibration tester for 8 hours, but no movement or shifting of the hardening agent inside the glass tube was observed. Furthermore, 10 cycles of freezing and thawing at -30°C for 7 hours and +20°C for 17 hours were performed, but no abnormality was found in the glass hardener storage tube.

Made of mudstone with a compressive strength of 400Kg/ ^cm2, diameter 42mm and length 100cm.
Drill a hole and insert one of the above cartridges, diameter 25.
An anchor bolt made of mm deformed steel bar was inserted while rotating.

After 1 hour, I pulled it out with a center hole jack to check the adhesion strength, and the bolt was severed from the threaded part at 22t, indicating sufficient adhesion strength.

Example 2 100 parts by weight of a commercially available benzoyl peroxide diluted with water (Nipper BW Nippon Oil Co., Ltd. high quality product with a water content of 25% by weight) and 80 parts by weight of commercially available glass micro hollow spheres (Glass Bubbles 15B manufactured by 3M). A paste-like peroxide mixture was obtained by mixing 300 parts by weight of water.

A cartridge according to Example 1 was made and subjected to vibration, freeze-thaw contact, and pull-out tests. The results were exactly the same as in Example 1, there were no abnormalities in each test, and the adhesion strength was also good.
The bolt broke at 23 tons.

Comparative Example 1 A curing agent composition was charged into a glass tube (same as used in Example 1) according to Example 1 except that the phenolic resin hollow body was not used in Example 1, and this was loaded into a cartridge. A cartridge was prepared.

When this cartridge was subjected to vibration at 15Hz±2G using a vibration tester according to Example 1, movement and unevenness of the curing agent inside the glass tube was observed after 10 hours. Furthermore, when the glass tube was subjected to freeze-thaw cycles at -30°C + 20°C, it broke on the third cycle.

Comparative Example 2 A curing agent composition was prepared according to Example 2, except that a commercially available glass micro hollow body (trade name: Glass Bubble 15, manufactured by 3M) was not used in Example 2, and this was loaded into a cartridge and used as an anchor. A cartridge for fixing bolts was made.

When this cartridge was subjected to a vibration test according to Example 1, deviation was observed after 1 hour, and during a freeze-thaw test, it was observed that the glass tube broke after 2 hours.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views of a conventional cartridge for fixing anchor bolts, and FIG. 3 is a longitudinal cross-sectional view of a cartridge loaded with a storage tube of a curing agent composition for anchor bolt fixing materials according to an embodiment of the present invention. It is a diagram. 1, 1a, 1b: Cartridge container, 2, 2
a, 2b: Cartridge container enclosure, 3, 3
a, 3b: unsaturated polyester resin, 4, 4a,
4b: Aggregate, 5, 5a, 5b: Hardening agent, 6, 6
a, 6b: Hardening agent storage tube, 7: Microscopic hollow body.

Claims (1)

[Scope of Claims] 1. A fixing material made of a synthetic resin and its curing agent composition are housed in a cartridge so that they do not come into contact with each other, and when necessary, the two are mixed and brought into contact to harden the fixing material and fix the anchor bolt. A curing agent composition for a bonding material is characterized by comprising micro hollow bodies made of powdered organic peroxide or a filler added thereto, water and a substance that does not react with the curing agent. A hardening agent composition for anchor bolt fixing materials. 2. The curing agent composition for an anchor bolt fixing material according to claim 1, which contains 0.1 to 20% by weight of micro hollow bodies.