JPH0512493B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to lightweight aerated concrete panels (hereinafter referred to as
Regarding the method of driving anchors into ALC panels (referred to as ALC panels).

B. Prior art In order to cover the surface of an ALC panel with a decorative laminate or to attach household appliances or equipment to the laminate or ALC panel, anchors are first driven into the ALC panel, and various The members are attached and fixed. However, ALC panels are brittle and lack strength, so if you forcibly drive the anchors, the ALC panel itself will be damaged, and if a large stress is applied to the anchors, the surrounding areas of the ALC panel where the anchors are driven will break. The anchor may collapse, resulting in a decrease in pull-out strength, and the anchor may fall off.

Therefore, in the past, an adhesive combination type anchor was used, in which a resin adhesive capsule was driven together with the anchor, the capsule was broken, and the resin adhesive that flowed out was used to firmly adhere to the ALC.

C. Problems to be Solved by the Invention The adhesive combination type anchor has poor fire resistance and durability because the main component of the adhesive is epoxy resin. In addition, since the shrinkage rates of ALC and epoxy resin are different, stress and strain occur due to the effects of humidity and temperature differences, and this strain creates gaps in the anchor driving area, allowing rainwater to enter into the gaps, resulting in condensation and freezing. Secondary damage caused by this is also expected.

Above all, ALC panels are weakly alkaline at the beginning, but over time they change from neutral to acidic, and as a result of the carbonation phenomenon, neutralization shrinkage occurs, and tensile stress acts on them. and continues to deteriorate. The holding power of a well-driven anchor gradually loses its holding power over time.

D. Means for solving the problem The present invention is a method of driving anchors into fragile ALC panels, which can be firmly maintained semi-permanently. A drilling step for forming an embedding hole, an inorganic hardening agent impregnation step for injecting an inorganic hardening agent mainly composed of an aqueous alkali metal solution into the anchor embedding hole or allowing it to penetrate into the periphery of the anchor embedding hole, and a step in which the inorganic hardening agent is The method comprises an anchor driving step of driving the anchor into the embedded hole by a predetermined means before hardening.

E. Effect When the inorganic curing agent is impregnated into the ALC panel,
The strength temporarily decreases and the force required to drive the anchor decreases, but when it hardens, the strength increases and a high bonding force is obtained. In addition, the part impregnated with the inorganic curing agent was modified to be alkaline and deteriorated.
The strength of the ALC panel itself is restored, and
It is effective in preventing anchor rust, matching yields, and preventing salt damage and frost damage.

F. Example The drawing shows the procedure of the anchor driving method according to the present invention. First, an anchor embedding hole 2 slightly smaller than the diameter of the anchor is formed at the anchor driving site of the ALC panel M using a drill 1. (Illustrated in Figure 1a). Next, a silicate-based aqueous solution 3, which is an inorganic curing agent mainly composed of an alkali metal aqueous solution, is injected into the anchor embedding hole 2, and applied around the entrance of the anchor embedding hole 2 (as shown in Figure 1b). ) is impregnated into the periphery of the anchor embedding hole 2 (as shown in FIG. 1c).
Through this inorganic curing agent impregnation step, the ALC panel M contains moisture and its strength is temporarily reduced, making it easier to drive anchors into it. Therefore, before the silicate-based aqueous solution 3 in the anchor embedding hole 2 begins to harden, the anchor 4 is driven in (as shown in Figure 1d).
If necessary, a fixing means such as expanding the sleeve 4a by tightening a screw is used to wait for the silicate-based aqueous solution 3 to harden (as shown in FIG. 1e). The silicate-based aqueous solution 3 is alkaline and has a low viscosity suitable for penetrating into the ALC, so it is suitable for penetrating deep into the ALC and reforming a deteriorated ALC panel. When the silicate-based aqueous solution 3 hardens, the anchor 4 is completely fixed to the ALC panel M, and the pull-out strength is greatly improved compared to the conventional one, and in this example, the pull-out strength of the anchor is nearly doubled. Ta. In addition, since the area around the driven anchor becomes alkaline, the formation of rust on the metal part of the anchor and the freezing of condensed water are suppressed, and the shrinkage rates of ALC and inorganic hardener are approximately the same, so both It has high binding properties and can maintain its durability for a long period of time even in salt-damaged, environmentally polluted, and frost-damaged areas.

After the anchor is driven and fixed, for example, an angle member 5 is attached to the anchor 4, and various equipment such as a decorative board 5a is attached via the attached angle member 5.

In this example, a silicate aqueous solution was used as the alkali silicate aqueous solution which is the main component of the inorganic curing agent, but the silicate includes lithium silicate, potassium silicate, sodium silicate, calcium silicate, etc. Alternatively, a mixture of a plurality of them may be used, or materials other than silicates may be used. In addition, the anchor can be driven in before or after the inorganic hardening agent impregnation process, as long as it is before the inorganic hardening agent hardens.In the case of a split-tip female threaded anchor 4', the anchor embedding hole 2 should be driven shallowly. Since the amount is deep, in order to inject and impregnate the tip of the anchor 2 with the inorganic curing agent, first drive the anchor 4' and then pour the inorganic curing agent into the anchor embedding hole 2 from the side of the anchor embedding hole 2. It is effective to drill a bypass hole 6 toward the bottom or an extension thereof, insert a nozzle 7 into the bypass hole 6, and inject the inorganic curing agent (FIG. 3).

Effects According to the present invention, the strength of the ALC is temporarily reduced due to the impregnating action of the inorganic curing agent, and the anchor can be driven deep with a light driving force. The part impregnated with the curing agent is alkalized and its strength is increased. The anchor is firmly fixed as the inorganic curing agent hardens and the frictional force increases, allowing it to maintain stable bonding force for a long period of time in salt-damaged, environmentally polluted, or frost-damaged areas. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the anchor driving method according to the present invention, and Figures 1a to 1e are explanatory diagrams of the work procedure, and Figure 2 shows how to install a decorative board using the driven anchors. Explanatory diagram of the condition, 3rd
The figure is an explanatory diagram showing an example of changing the injection of an inorganic curing agent. 1...Drill, 2...Anchor embedding hole, 3
...Silicate-based aqueous solution, 4,4'...Anchor, 4
a...Sleeve, 5...Angle material, 6...Communication hole, 7...Nozzle, M...ALC panel.

Claims (1)

[Scope of Claims] 1. A drilling step of forming anchor embedding holes in a desired part of a lightweight cellular concrete panel, and injecting an inorganic curing agent mainly composed of an aqueous alkali metal solution into the anchor embedding holes or the area around the anchor embedding holes. A method for driving anchors into lightweight aerated concrete panels, which comprises: an impregnating step with an inorganic hardening agent, and an anchor driving step, in which the anchor is driven into the embedded hole by a predetermined method before the inorganic hardening agent hardens. . 2. The method for driving an anchor into a lightweight cellular concrete panel according to claim 1, wherein the inorganic curing agent is a silicate-based aqueous solution.