JPH0326311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is intended for use when performing piping and wiring work for water condensation, drainage, air conditioning, electrical work, etc.
The present invention relates to a method of inserting a tubular body or other penetrating body into a through hole provided in a partitioning structure such as a wall, and then backfilling a gap between the penetrating body and the through hole.

In recent years, buildings have become higher and taller, and their structures, functions, and uses have become more diverse.
At the same time, a rigorous review of disaster prevention performance is also underway. Systematic and numerous fire experiments have been carried out, and the results have been the prevention of building zoning, i.e.
The importance of preventing the spread of fire outside each compartment has been reaffirmed, and due to this situation, detailed discussions are also being held regarding openings that connect each compartment, compartment penetrations, etc.

When performing piping and wiring work for water condensation, drainage, air conditioning, electrical work, etc., it is unavoidable to pass through such pipes, wires, and those covered with noncombustible materials as necessary. Provide through holes in floors, walls, etc.

The outer diameter of this through hole has to be larger than the outside diameter of the various types of penetrating bodies mentioned above, so the penetrating part consisting of the gap between the inner wall of the through hole and the outer wall of the penetrating body prevents the spread of fire in the event of a fire after construction. To prevent this, it is necessary to backfill and seal with suitable non-combustible material.

Conventionally, this backfilling method involves using a board made of wood, metal, plastic, etc., with a hole in the center that is approximately the same as the outer shape of the penetrating body, and one direction outward from the outer periphery of the hole. Constructing a collar-like body of the penetrating body using a cut plate, and abutting the collar-like body on the lower surface of the floor slab and one or both surfaces of the wall,
The general method is to fix the penetrating body with nails, etc., or to clamp it between a band wrapped around the penetrating body and each of the above-mentioned surfaces, and then pouring ordinary cement, water mixture, etc. into the penetrating part by an appropriate method. It's being targeted.

However, when using these methods, it is necessary to manufacture a large number of flanges to match the penetrating body with various cross-sectional shapes and sizes, and the method of fixing the flanges to a slab, wall, etc. is difficult. There are complications such as the use of nailing and fixing devices for pressing against slabs, walls, etc.

Furthermore, when filling the gap between the inner wall of the through hole and the outer wall of the penetrating body with ordinary noncombustible materials, such as cement or water mixture, the work is often done in a narrow work space, and the penetrating body may shift from the center of the through hole. Since there are many cases in which pipes are piped together, it is extremely difficult to completely fill the above-mentioned gaps without any gaps. In the unlikely event that a gap is left, the fire can spread from there, causing an unexpected catastrophe.

As a result of intensive studies on the above-mentioned problems, the inventors of the present invention have found that, in a through-hole formed by a gap between an inner wall of a through-hole and an outer wall of a through-hole, a gas-condensable plastic material is preferably used as a lump. In the case of a vertical penetration part, it is press-fitted into at least the lowest part of the penetration part, and in the case of a horizontal penetration part such as a wall or beam penetration part, it is press-fitted into at least both end parts of the penetration part, and the outer surface of the quick-setting plastic material is press-fitted. Use a trowel to make it flush with the outer surface of the surrounding structure, wait for it to harden rapidly, and fill the remainder of the penetration with highly fluid mortar or concrete containing a high-performance water reducing agent, filling it without any gaps. The present invention was completed by discovering that by solidifying, the penetrating portion can be backfilled very easily.

That is, the gist of the present invention is that a penetrating body is inserted into a through hole of a partition structure, and in the case of a vertical penetrating part that is constituted by a gap between an inner wall of the through hole and an outer wall of the penetrating body. At least the lowermost part of the penetration part, or at least both end parts of the penetration part in the case of a horizontal one, is filled with a mixture of quick-setting material and water and rapidly hardened, and the remaining part of the penetration part is filled with a high-performance water reducer. The present invention relates to a method for backfilling a section penetrating portion by injecting mortar or concrete added with and filling and fixing without any gaps.

The rapid setting material according to the present invention should have a short solidification (setting or hardening) time, preferably solidify in about 5 to 60 minutes after adjusting the formulation, have good adhesion to the inner wall of the through hole, and solidify. It is required that there is little shrinkage during and after solidification, that it is non-flammable, that it has strength above a certain level, and that it does not contain harmful substances. Materials that meet these requirements include those based on gypsum and those based on cement. Since gypsum itself has a rapid solidifying action that satisfies the above conditions, it is possible to add various aggregates, fillers, additives, etc. to it as necessary to make it a quick-setting material. It is. When using cement as a base, Portland cement and the like do not have the rapid solidifying properties that meet the above conditions, so it is necessary to add various calcium aluminates, sodium silicate, or fast-setting cements containing large amounts of these.

Examples of the high performance water reducing agent according to the present invention include the following. Examples of these manufacturing methods are JP-A No. 43-21659, JP-A No. 41-11737, and JP-A No. 57-Sho.
145059 etc.

Melamine sulfonic acid formaldehyde high condensate salts, naphthalene sulfonic acid formaldehyde high condensate salts, lignin sulfonate salts.

Both have a hydrophobic group and a hydrophilic group in their molecules, and have the effect of adsorbing to the surface of cement particles, causing repulsion between particles and increasing dispersibility.

As mentioned above, it is extremely difficult to completely fill small penetrations with mortar or concrete that does not contain a high-performance water reducer in a work area that is usually confined to a small space. In mortar or concrete with increased apparent fluidity, water and cementitious components separate before hardening, making it impossible to obtain the desired solidified product.

That is, the high-performance water reducing agent of the present invention is essential in order to realize injection work using a material with high fluidity that can completely fill even the small gaps of the penetrating portion.

Since the mortar or concrete to which the high-performance water reducing agent of the present invention has been added has extremely high fluidity, backfilling can also be carried out using, for example, a pouring pot. Further, in the floor penetrating portion, there is no need to use a trowel to make the end flush with the floor, and it can be a horizontal surface. Even when backfilling the penetration parts of walls and beams, because of the above-mentioned excellent fluidity, it is possible to make a hole at the top of both ends filled with the quick-setting material and perform the filling by injecting from there.

As an additional note, after the injection work is completed, the above-mentioned quick-setting material is again pushed into the injection hole in a horizontal penetrating part of a wall, beam, etc., before it solidifies, and the hole is closed and made flush with the surrounding area using a trowel. If you finish it like this, the filling will be complete.

As described above, the method of backfilling the compartment penetration part of the present invention can be carried out extremely simply by using a combination of two types of materials, and since the void is completely filled and solidified with non-combustible material, It is also useful in terms of disaster prevention as there is no fear of fire spreading from this area.

The present invention will be explained in more detail with reference to Examples below.

Example A through hole with an inner diameter of about 20 cm was bored in a floor slab (about 10 mm thick), and a cement-coated synthetic resin drain pipe with an outer diameter of 13 cm was installed through this hole. The gap between the inner wall of the through hole and the outer wall of the drain pipe was 5.5 cm at maximum and 1.5 cm at minimum.

Quick-setting mortar having the composition shown below was quickly kneaded to form a lump, and the lump was pushed into the gap from below, and the lower surface was finished with a trowel. The depth of the lump was 1 to 2 cm.

Rapid setting mortar composition Parts by weight Portland cement 50 Alumina cement 10 Sodium aluminate 1 Silica sand 12 Water 27 After 30 minutes, mix mortar with the following composition with water in advance and place it in a water bottle-like container with a thin spout at the tip. It was poured from above the penetration part until it was flush with the top surface of the floor slab. After one day and night, approximately 1mm of sinkage was observed, but the backfilling of the penetration part was complete.

Composition of mortar for injection Parts by weight Portland cement 220 Aggregate (river sand) 650 Sodium salt of melamine sulfonic acid formaldehyde high condensate 3 Water 127

Claims (1)

[Claims] 1. Insert a penetrating body into a through-hole of a partition structure, and in the case of a vertical penetrating part consisting of a gap between the inner wall of the through-hole and the outer wall of the penetrating body, at least the lowest part thereof. In the case of a horizontal type, at least both end portions of the penetration are filled with a mixture of a quick-setting material and water, and the mixture is rapidly hardened, followed by a mortar with a high performance water reducing agent added to the remainder of the penetration. Or, a method for backfilling a section penetration, which is characterized by pouring concrete and solidifying the filling without any gaps.