JPH03225000A - Anchoring of anchor element - Google Patents

Abstract

PURPOSE:To make instantaneous anchorage possible by a method wherein a capsule made of water-holding container in which cement and accelerating agent are contained is inserted into a bore after water wherein water-holding substance is solved or dispersed is poured into the capsule, and the capsule is broken with an anchor element. CONSTITUTION:Cement and accelerating agent made from calcium-aluminate or the like are contained in a water-holding capsule made of paper or the like. Then the capsule is inserted into a bore with water wherein water-holding substance made of inorganic substance or macromolecular substance is solved or dispersed and poured therein, or the water is poured into the capsule after the capsule is inserted into the bore. An anchor element is then thrust into the bore and thereby the capsule is broken, letting the capsule and the water containing specific substance make contact each other so that the anchor element is anchored. Thereby anchorage that does not vary in strength in anchoring can be executed stably and speedily.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for fixing an anchor element such as an anchor bolt.

<Conventional technology and its problems> Conventionally, the anchor element was fixed using a capsule made by storing cement in a container made of water-absorbing material such as paper, which was immersed in water and then inserted into a perforation. It is known that it is fixed by pressing the
Publication No. 2).

However, in this method, the capsules are soaked in water before use, so the water-absorbent container made of zero paper absorbs water and expands, making it impossible to push the capsules into the holes. ■Fixing strength changes greatly depending on water absorption time. ■Since the curing start time is determined at the same time as water absorption, materials that set or harden quickly cannot be used. There were other issues.

As a result of various studies for the purpose of solving these problems, the present inventor obtained the knowledge that it is sufficient to bring the capsule into contact with water containing a specific substance within the pores, leading to the completion of the present invention. .

Means for Solving the Problems> That is, the present invention provides a method for fixing an anchor element using a capsule containing cement and an quick-setting agent in a water-absorbing container made of paper, in which a water-retentive substance is dissolved or dispersed. A method for fixing an anchor element, the method comprising: pouring water into the hole and then putting the capsule into the hole, or putting the capsule into the hole and pouring the water, and then pushing the anchor element to destroy the capsule. It is.

The present invention will be explained in detail below.

The capsule according to the present invention is a water-absorbent container made of paper or the like containing cement and an quick-setting agent.

As the cement, portland cement, alumina cement, slag cement, etc. can be used.

Further, the quick-setting agent according to the present invention is calcium aluminates.

As calcium aluminates, for example, A is Al
If 2O3, C is CaO, CAz, CA, C+zA
t, C++A, CaF2, C3AaCaFz, (:3A
One or more types selected from calcium aluminates shown as 3CaSO4 and C38, or amorphous forms having a calcium aluminate composition, and further, two or half of these calcium aluminates or amorphous forms. Examples include water and anhydrous various types of Ceracola, and those blended with inorganic sulfates such as sodium sulfate and magnesium sulfate. In particular, anhydrous Ceracola is added to an amorphous substance having a composition of CI□A7 or C3AaCaFz by 0.5 to 2. When the admixture is blended in double weight amounts, it exhibits great rapid setting and expandability, so it is possible to fix the anchor element more firmly in a shorter time.

The water-retaining substance according to the present invention is one that is dissolved or dispersed in the water used to significantly reduce fluidity, and includes, for example, inorganic substances such as bentonite, ettringite, and silica gel, and water glass and water-retentive substances such as sodium chloride and sodium aluminate. Glass gelling agents, as well as starch, methylcellulose, carboxymethylcellulose, ethylcellulose, polyvinyl alcohol, polyethylene oxide, polyacrylamide, vinyl alcohol-acrylate copolymer, polyacrylonitrile hydrolyzate, and general RO (AO) ), lH (in the formula, R is an alkyl group, A is one or more alkyl groups, and n is an integer), and the like.

Among these widths, it is preferable that the anchor element has a larger water retention capacity, for example, one that can gel water of 100 times or more, particularly 200 times or more of its own weight, because it can more firmly fix the anchor element.

Furthermore, by adding various admixtures such as rapid setting agents such as sodium aluminate, sodium carbonate, and potassium carbonate, retarders, expansion agents, foaming agents, and water reducing agents, corresponding effects can be exerted. is also possible.

In the present invention, the anchor element is pushed in after pouring water made by dissolving or dispersing a water-retaining substance and then inserting the capsule into the hole, or after pouring the water after placing the capsule in the hole. This destroys the capsule.

From the viewpoint of strength and workability, it is preferable to inject water into the holes in an amount of approximately 10 to 30 parts by weight based on 100 parts by weight of cement in the capsule. If the amount is significantly less than 10 parts by weight, workability will be poor, and if it exceeds 30 parts by weight, the strength will be low, which is not preferred. However, even if more than 30 parts by weight of water is put into the hole, it does not cause much of a problem because unnecessary water can overflow from the hole by inserting the capsule and immediately pushing the bolt to fix it. It is also possible to control the amount of water by inserting a capsule into the hole first, pouring water in before construction, and pushing in the bolt.

<Example> The present invention will be further explained below with reference to Examples.

Example 1 Ordinary Portland cement 7kg, 6,000afi/
Blaine value of g amorphous C1□A4.5kg18.80
1.5 kg of anhydrous Ceracola with a Blaine value of 0c+fl/g
, 7 kg of No. 6 silica sand, 120 g of potassium carbonate, 100 g of sodium citrate, and a water-retentive material whose main component is polyacrylate, Steel Chemical Industry ■Product name [Aqua Keep J
5g was mixed. 85g of this mixture is made into a diameter of 20mmφX1
A capsule was made by packing it into a 50mm Japanese paper bag. This mixture cures in 2 minutes at 20"C.

Next, II! After adding 5 g of Aqua Keep J to the water and mixing, the mixture was immediately put into a glass tube with an inner diameter of 18III [nφ and a length of 200 mm to form a gel.The gel was taken out of the glass tube and pushed upward into the hole. After that, the capsule was pushed in and fixed while rotating the bolt.

When a pullout test was conducted 30 minutes later, the bolt broke at 12 tons.

<Effects of the Invention> As described above, the present invention allows water in which a water-retentive substance is dissolved or dispersed to be poured into a hole and then a capsule is inserted, or after a capsule is inserted and water is poured, an anchor element is pushed into the hole. This method destroys the capsule and fixes the anchor element. ■It is reliable and fast in construction.

■There is no variation in fixing strength.

■Since it is possible to use materials that have extremely rapid setting properties, instantaneous fixing is possible and load can be applied quickly.

■Even deformed holes can be constructed quickly.

■Fixing strength is higher. Furthermore, since the water ratio can be kept constant, fixing with extremely small variations is possible.

■Can be reliably installed in horizontal or upward facing holes.

It has the following effects.

Claims (1)

[Claims] (1) In a method of fixing an anchor element using a capsule containing cement and a quick-setting agent in a water-absorbent container made of paper, water containing a water-retaining substance dissolved or dispersed is poured into the capsule. A method for fixing an anchor element, which comprises placing the capsule in a hole or pouring the water into the hole, and then pushing the anchor element to destroy the capsule.