JPS5965687A - Back-filling method for partition penetrating section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies to through-holes that are unavoidably provided in compartment structures such as floors and walls of buildings when performing piping and wiring work for water supply, drainage, air conditioning, electrical work, etc. , after inserting a tubular body or other penetrating body,
The present invention relates to a method of pushing back the gap between a penetrating body and a through hole.

In recent years, buildings have become taller and their structural functions and uses have become more diverse, and along with this, their disaster prevention performance is also being rigorously reviewed. A large number of systematic fire experiments have been carried out, and as a result, the importance of fire prevention in building sections, that is, preventing the spread of fire outside each section, has been reaffirmed. In-depth discussions are also being held regarding areas such as section penetrations.

When performing piping and wiring work for water supply, drainage, air conditioning, electrical work, etc., it is unavoidable to use penetrating objects such as 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 penetration part consisting of the gap between the inner wall of the through hole and the outer wall of the penetrating body described in 2. It must be backfilled and sealed with a suitable non-combustible material to prevent the spread of fire.

Conventionally, this backfilling method involves using a board made of wood, metal, plastic, etc., with a hole in the center having the same shape as the outer shape of the penetrating body, and cutting one step outward from the outer periphery of the hole. Construct the flanged body of the penetrating body using the split board, and contact the flanged body with the lower surface of the floor slat A core method is generally used in which ordinary cement, water mixture, etc. is poured into the penetration part by an appropriate method after the material is clamped between a band wrapped around the material and the surface of the material. .

However, when using these methods, it is necessary to manufacture a large number of flanges to match penetrating bodies with various cross-sectional shapes and sizes, and the method of fixing the flanges, such as slabs,
There are complications such as nailing to walls, etc., and using fixtures for pressing onto 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 study on the problems mentioned above, the inventors of the present invention have found that the gas-setting plasticizer is preferably made into a lump, and is composed of a gap formed between the inner wall of the through hole and the wall of the penetrating body. Among the penetration parts, 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. Use a trowel to prepare the outer surface of the material so that it is flush with the outer surface of the surrounding structure, wait for it to harden rapidly, and then fill the remainder of the penetration with highly fluid mortar or concrete containing a high-performance water reducer. However, they discovered that the penetrating portion can be backfilled extremely easily by filling and solidifying without any gaps, and completed the present invention.

That is, the gist of the present invention is that a penetrating body is inserted into a through hole of a partition structure, and if a perpendicular penetrating part is formed 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 penetrating part, or in the case of a horizontal one, at least both ends of the penetrating part are filled with a mixture of quick-setting material and water, and after rapidly hardening, the remaining part of the penetrating part is filled with a high-performance material. This invention relates to a method for backfilling a section penetrating portion by injecting mortar or concrete added with a water reducing agent and solidifying the filling without any gaps.

The rapid setting material according to the present invention has a short solidification (setting or hardening) time, preferably 5 to 6
Solidifies in about 0 minutes, has good adhesion to the inner wall of the through hole, has little shrinkage during and after solidification, is nonflammable, has a certain level of strength, and does not contain harmful substances. , is required. 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, various aggregates, fillers, additives, etc. are added to it as necessary.
It is possible to use it as a quick-setting material. When using cement as a base, since Portland cement and the like do not have the rapid setting properties that meet the above conditions, it is necessary to add various types of calcium aluminate, sodium silicate, or fast-setting cements containing large amounts of these.

The high performance water reducing agent according to the present invention includes the following bases, naphthalene sulfonic acid formaldehyde high condensate salts,
Lignosulfonate type.

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-mixed concrete that does not contain a high-performance water reducer in a work place that is usually small, but it is difficult to completely fill small penetrations with mortar concrete without adding a high-performance water reducer. In mortar or concrete that has poor apparent fluidity, water and cement 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 performed using, for example, a pothole.
Furthermore, in the floor penetrating portion, there is no need to use a trowel to finally connect it to the floor, and it can be a horizontal surface. Even when backfilling the penetrations of walls and beams, since it has excellent mud flowability, a hole is made in the first part of both ends filled with quick-setting material and the filling is done by pouring from there. be able to.

In this paper, after the injection work has been completed, the quick-setting material is again pushed into the holes in the horizontal penetrations of walls, beams, etc., before they solidify, and the holes are sealed with a trowel. If you finish it flush, 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 the voids can be completely filled and solidified with noncombustible material. Therefore, it is useful in terms of disaster prevention as there is no fear of fire spreading from this area.

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

Example floor slab (thickness about I Q cnl) with an inner diameter of about 20 cm
A through hole was drilled through which a cement-coated synthetic resin drainage pipe with an outer diameter of about 13mm was installed. The gap between the inner wall of the through hole and the outer wall of the water control pipe was 55 cm at maximum and 15 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 troweled and J-shaped. The depth of lumps is 1 to 2.
It was cm.

Rapid setting mortar composition Weight parts Portland cement 50 Alumina cement 10 Sodium aluminate 1 Silica Sand
12 Wednesday 273
After 0 minutes, mortar of the following composition, which had been mixed in advance with water, was placed in a watering can-like container with a thin spout at the tip. . After one day and night, approximately one shell was seen to have sunk, but the penetration area had been completely backfilled.

Mortar composition for injection Weight part Portland cement 220 aggregate (river sand)
650 patent applicant Showa Denko Co., Ltd. (1 representative) Patent attorney Sei Kikuchi

Claims (1)

[Claims] A penetrating body is inserted into a through hole of a partition structure, and in the case of a vertical penetrating part formed by a gap between an inner wall of the through hole and an outer wall of the penetrating body, at least the lowermost part thereof, For horizontal ones, at least both ends of the penetration are filled with a mixture of a quick-setting material and water, and the mixture is rapidly hardened, followed by mortar or concrete with a high-performance water reducing agent added to the remainder of the penetration. A method for backfilling a section penetrating portion, characterized by injecting and solidifying the filling without any gaps.