JPS59187807A - Manufacture of composite joint pipe - 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 relates to a method for manufacturing a composite joint pipe in which the outer peripheral surface of an inner pipe made of synthetic resin, metal, etc. is coated with a fire-resistant inorganic material containing reinforcing fibers.

As is well known, in high-rise buildings, fire-resistant composite pipes are used for water supply and drainage pipes, air conditioning pipes, electrical pipes, and various other types of piping in order to enhance disaster prevention effects against fires, earthquakes, and the like. This composite pipe is made of an inner pipe made of hard salt f-vinyl or other synthetic resin or metal, and the outer periphery of the pipe is coated with a fire-resistant inorganic material containing reinforcing fibers. Materials mixed with various aggregates, etc. are often used, and asbestos, rock wool, glass fiber, etc. are often used as reinforcing fibers1. 2. Requires use of joint pipes in shape, Y shape, or other shapes.
Unless this joint pipe is made into a composite pipe similar to the one described above, the disaster prevention effect will be lost.

Conventionally, when manufacturing this composite joint pipe, a holder sandwiched between molded rough splits was inserted and supported.
/ζUsing the split mold for forming, which consists of a two-component mold and a -1 split mold, which have a recess located on the outer circumferential surface of the joint pipe. Open the inner tube of the tube [
] Bring the end face into close contact with the inner surface of the split mold, and support the open end of the inner tube from the outside of the split mold with the holder, and then put the two split molds together, attach + and -, and fill the space in the remaining part of the recess. It is common to press-fit and fill with refractory inorganic material 4.4.

(For example, special 1≦1 [[Method described in the specification of Sho b5-106764]) Although this manufacturing method has high product precision, it has the following drawbacks. f+] To determine the strength required for the product, when reinforcing fibers of a certain length or more are mixed with fire-resistant inorganic particles of a certain density or more, the fluidity required for press-fitting the kneaded material is increased. In order to make the Jζ effect, it is necessary to add Tashu water, and as a result, the appearance of strength 1 degree becomes a rod, and the demolding work becomes τIJ function after waiting several hours.

The present invention has been proposed in view of the above VC. It is made of fibers (
The aim is to utilize all of the long fibers to the maximum extent possible, and compared to conventional press-fit molding, even if the amount added is reduced, the strength is the same or better, and at the same time, the amount of water mixed in can be significantly reduced. The present invention relates to a manufacturing method that allows demolding to be performed immediately after forming an unhardened composite tube.

As a result of extensive research, the present inventors prepared and fitted an unsolidified sheet in which reinforcing weft threads ff were mixed into a fire-resistant inorganic material and were orientated and dispersed two-dimensionally. Lay it along the inner surface VIC of the recess provided inside the composite joint pipe forming mold, and if necessary, layer the same or a hydraulic coating mainly composed of the above-mentioned flammable non-organic additive, Combine the split molds so that the inner tube is housed in the center part, apply pressure from the outside to make the URU mold stick tightly, and fill the space between the inner surface of the recess and the inner tube with a one-sided inorganic material (-2 Merugaso W,
The excess material is allowed to flow out from the gap between the mold parts when the mold parts are brought into close contact with each other.

Next, remove the split mold, take out the molded product, and after that or before removing it from the mold 7, tighten it.

For example, long fibers can be used as effectively as possible for reinforcing fibers ′[),
Therefore, it becomes difficult to develop sufficient strength even with a small amount of addition, and furthermore, the amount of kneading water is significantly reduced. 4) Because of this, it is possible to avoid using excess water even in the process of two-dimensionally orienting the reinforcing paste described below, and it also has shape retention that allows for demolding immediately after molding. I made a small discovery that it could be realized and completed the present invention.

That is, the gist of the invention is that the outer circumferential surface of the inner tube is reinforced with a fiber material and covered with a fire-resistant inorganic material.1. In the method for manufacturing a composite joint pipe using a mold consisting of a plurality of split molds each having a recess corresponding to the size of the composite joint pipe made of At least one unsolidified sheet obtained by two-dimensionally orienting and dispersing the material is laid on the inner surface of each of the split mold recesses, and the total volume of the laid sheet is equal to or less than the covering of the sliding joint pipe. When the volume is smaller than the total volume of the part, the trench is larger than the volume, and the sheet is further reinforced with a fire-resistant inorganic material and a hydraulic coloring material is added as a main component. The present invention provides a method for manufacturing a composite joint pipe, in which the split molds are stacked one on top of the other, pressed against the outer circumferential surface of the inner pipe, the split molds are assembled into one body, and the split molds are folded or removed and then cured and hardened.

The contents of the present invention will be explained in detail below.

The method according to the present invention consists of a plurality of split molds in which an inner pipe for manufacturing a composite joint pipe can be housed, and only the outer peripheral surface of the inner pipe is filled with the material for the composite joint pipe. A mold is used, and the inner tube is fixed at a fixed position in the recess of the mold.A notch is provided in the abutting part of the split mold where the opening part of the inner tube faces the opening. The uninvented method can be carried out efficiently by holding and holding the holder for positioning the inner tube inserted in the 12° mold.The mold consists of a plurality of split molds and can be freely separated. If the molds are to be combined and fixed, bolt holes for tightening may be provided in the split molds themselves, but the entire mold may be placed in a separate box mold for fixation.

The material of the mold may be made of synthetic resin such as hard urethane, which is somewhat flexible for ease of removing the molded product, but it may also be made of non-flexible metal, ceramic, or wood. The present invention is not limited to these materials.

Examples of fire-resistant inorganic materials in the present invention include portland cement, silica cement, blast furnace cement, alumina cement, magnesia cement, various ettringite cements, various types of gypsum, and calcium silicate, and examples of reinforcing fibers include asbestos, rock wool, and slag wool.
Glassy=R# Examples include various ceramic wools, methyl fibers, various synthetic fibers, and various natural fibers.

In addition, the fire-resistant inorganic material of the present invention includes silica sand, pearlite,
Vermiculite, volcanic rock, calcium carbonate, wood wool, etc. can be added, and various admixtures, water reducing agents, etc. may also be added for other purposes, such as improving moldability, fluidity, etc.

In the present invention, the following method can be exemplified as a method for producing an unhardened sheet in which reinforcing fibers are mixed into a fire-resistant inorganic material and are two-dimensionally oriented and dispersed.

(1) Distribute reinforcing fibers, fire-resistant inorganic materials, etc. in a large amount of water, make a thin sheet using a papermaking method, and then laminate multiple sheets.

(2) A sheet of reinforcing fiber, a fire-resistant inorganic compound, etc. mixed with a small amount of water is passed through a narrow gap between rolls, and a plurality of sheets are laminated as necessary.

(3) Press the same mixture as in (2) into sheets, and laminate multiple sheets if necessary.

(4) A sheet made by pressing and molding the same mixture as in (2) and cutting in a mold is cut to approximately match the inner surface of the recess of each split mold of the mold.

The remaining part of the sort is formed into a sheet again, and the sheet is laid along the inner surface, and the inner tube is positioned in the center, and each of the split molds is assembled from the periphery, and pressure is applied from the outside to make the split molds stick together. The space between the inner surface of the recess and the outer surface of the inner tube is filled with a refractory inorganic material containing reinforcing fibers without any gaps, and the excess refractory inorganic material is discharged from the seams of the split molds. In addition,
If necessary, holes may be provided in other parts of the split mold to discharge excess refractory inorganic material.

The method according to the present invention is a method in which a coating material is laid and filled in advance in the recessed part of the split mold, and then the outer peripheral surface of the inner tube is pressed and coated. If the amount is smaller than the sheathing material of the product, the composite joint pipe will not be able to match the size of the split recess, and for example, if there is a dent on the outer surface of the sheathing material, pores may occur inside the sheathing material, resulting in a defective composite pipe. It becomes a joint pipe.

In the present invention, in order to prevent the occurrence of these defects,
The volume of the covering material laid and filled in the split mold recesses is required to be larger than the volume of the covering material of the molded product. Therefore, on top of the unsolidified sheet laid,
A homogeneous unsheeted material, a hydraulic fire-resistant inorganic material containing no reinforcing fibers, may be layered.

Combination of the split molds mentioned above, pressurization, discharge of excess destruction material,
Immediately after completion of the step 8 of adhering the split molds, the mold is removed, or the mold is moved to the curing and hardening step without removing the mold.

In the present invention, by adopting the above configuration, (1) Most of the reinforcing fibers are oriented and dispersed in the circumferential direction necessary for reinforcement, and are extremely effective for reinforcement, and the addition amount is small, for example, compared to the conventional casting method. The same bell strength can be achieved even at 70% of the addition amount of 8 degrees.

(2) Furthermore, it is also possible to use longer fibers, such as 10 mm or more, which cannot be used with the slurry casting method.
It is also possible to dramatically increase the impact strength of products.

(3) Even in non-assimilated molded products, the surface layer of the covering material has a high fiber content and is oriented in the direction of the outer circumferential surface, and less water is used, so it can be removed immediately after the split mold is attached, so per mold. The productivity is significantly improved compared to the conventional method of casting slurry of the coating phase into the mold.

The connection of the covering material corresponding to the butt part of the mold is as follows:
This can be easily achieved by increasing the amount of the covering material laid or by increasing the pressurizing time of the split mold, and the occurrence of cracks etc. can be prevented.

As described below, the manufacturing method of the present invention is extremely useful in terms of shortening the bM type waiting time and improving product performance.

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

Example 1 A kneaded material having the following composition was passed through rolls with a gap of 3 to form a sheet, and then four of these sheets were laminated to form one sheet.

Kneaded product composition (parts by weight) Ordinary Portland cement 45 Silica sand 2° Lightweight aggregate (perlite) 10 Polypropylene (2 denier, length 10 mm) o3 Chrysomele asbestos 45 Thickener (methylcellulose) o. 3 Water 2.

A hard vinyl pipe fitting (nominal diameter 100) with openings on three sides has a recessed part for covering only the outer periphery of the coating material to a thickness of 10 mm, and a ball for holding the following ball inserted into the opening of the fitting. A pair of formworks consisting of an upper mold and a lower mold each having a notch are pasted and laid on the inner surface of each part, and then a positioning holder is placed in each socket of the inner pipe. The seasonal beast was clamped and fixed between the above upper and lower molds, and crimped with a press.Immediately, the two molds were separated, and the covered inner tube was completely destroyed. Afterwards, it was air-dried to obtain a composite joint pipe.

Even if this product was dropped from a height of 1 m onto a concrete floor, no damage was observed, just like with the conventional casting method] 1-Z impact resistance ('U was also confirmed to be excellent) t/ζ
0 32

Claims (2)

[Claims] (1) Using a mold consisting of a plurality of split molds, the outer peripheral surface of the inner tube has a depression corresponding to the size of the composite joint tube, which is reinforced with a fiber material and covered with a fire-resistant inorganic material. In the method for manufacturing the composite joint pipe, at least one unsolidified sheet material obtained by two-dimensionally orienting and dispersing a fibrous material in a fire-resistant inorganic material is laid on the inner surface of each split recess. However, when the total volume of the laid sheet is less than the total volume of the covered portion of the composite joint pipe, the sheet or the fire-resistant inorganic material reinforced with a fiber material is further expanded until it becomes smaller than the volume. A composite joint pipe characterized by stacking hydraulic coating materials as the main component, pressing the separate molds against the outer circumferential surface of the inner pipe, combining the split molds into one body, and curing and solidifying as is or after removing the molds. manufacturing method. (2) The composite according to claim 1, wherein the inner tube positioning holder is inserted into the opening of the inner tube, and the holder is held by a notch provided in a mold at a position facing the opening. Manufacturing method of joint pipe.