JP7612288B2 - Method for covering sleeve pipe opening - Google Patents

Description

The present invention relates to a method for covering the opening of a sleeve pipe end during construction such as pouring concrete.

When pouring concrete for the floors of buildings, etc., holes called sleeves are sometimes made to allow electrical wiring, water pipes, etc. to pass through. Such sleeves are formed by fixing a sleeve pipe (a paper pipe called a void, a PVC pipe, an iron pipe, etc.) with nails or other tools at the desired position to the deck plate, which is part of the formwork or composite floor and also serves as the formwork, and pouring concrete around it after reinforcing bars have been placed, and removing the sleeve pipe if necessary after the concrete has hardened.

During the series of pouring operations, the opening at the end of the sleeve pipe needs to be appropriately sealed to prevent concrete from entering the sleeve pipe, to prevent workers from accidentally putting their hands or feet inside and falling, or to prevent objects from falling to the floor below. Specialized covers (hereafter referred to as sleeve covers) are commercially available as materials for sealing the opening of the sleeve pipe, and in many cases such commercially available sleeve covers are used.

However, a typical sleeve cover does not have the function of sealing the opening of the sleeve pipe, and cannot completely prevent the intrusion of concrete. In addition, on floors other than pipe shafts (PS) and machine rooms, the sleeve cover is directly covered with concrete, so it is necessary to scrape off the concrete attached to the surface of the cover after pouring the concrete. Therefore, the opening is closed with adhesive tape for sleeves installed in any location. For example, after fitting the sleeve cover into the opening of the sleeve pipe, multiple pieces of curing tape cut into strips are applied from the end of the sleeve pipe to the surface of the sleeve cover to cover it. The gap that occurs between the end of the sleeve pipe and the sleeve cover is sealed with the curing tape, so that the intrusion of concrete can be reliably prevented. Alternatively, if the diameter of the sleeve pipe is relatively small, a dedicated commercially available product called pipe sealing tape is cut into a square shape and applied to the opening instead of the sleeve cover. This also makes it possible to seal the opening of the end of the sleeve pipe.

Note that examples of documents that describe the formation of such sleeves and the technology for closing the opening of the sleeve tube include the following Patent Document 1.

Special Publication No. 7-15221

However, the above-mentioned covering method using adhesive tape has the problem that applying and removing the tape takes time and effort. In particular, when using masking tape on a sleeve pipe with a large diameter, it is necessary to prepare and apply many strips of masking tape, which is a tedious task. Furthermore, depending on the site, similar work may be required for many sleeve pipes (for example, in a machine room, it is necessary to pass many pipes and wires through the floor and walls, and many sleeves must be formed when pouring the concrete), and especially at such sites, the amount of work required to cover the opening of the sleeve pipe becomes enormous.

In addition, if any adhesive remains on the sleeve lid or sleeve pipe after the tape is removed, it will look bad, and if the sleeve lid is covered with masking tape, the warning notices on the surface of the sleeve lid will be difficult to see. Another weakness is that adhesive tape cannot be attached properly if the sleeve pipe or sleeve lid gets wet with rainwater, etc.

In view of the above situation, the present invention aims to provide a method for covering the opening of a sleeve pipe that can easily and suitably cover the opening of the sleeve pipe.

The present invention provides a method for covering an opening of a sleeve tube, the method including fitting a sleeve lid to an end of the sleeve tube and covering the end of the sleeve tube together with the sleeve lid with a covering body, when forming a sleeve using the sleeve tube, the method comprising the steps of:
The covering body includes a bag-shaped main body and an expandable annular fastening portion attached to an edge of the main body,
The sleeve cover has a portion that protrudes beyond the end of the sleeve tube with a larger outer diameter,
When the end of the sleeve tube is covered with the sleeve lid by the covering body, the annular fastening portion is attached and is caught on the large protruding portion of the sleeve lid.
The present invention relates to a method for covering an opening of a sleeve pipe, characterized in that

In the method for covering an opening of a sleeve tube of the present invention, a shower cap can be used as the covering body.

In the method for covering the opening of a sleeve tube of the present invention, after the covering body is attached to the end of the sleeve tube, the covering body may be further fixed to the sleeve tube using an adhesive.

The method for covering the opening of a sleeve tube of the present invention has the excellent effect of covering the opening of the sleeve tube simply and effectively.

4 is a flowchart showing an example of a procedure for forming a sleeve using the method for covering an opening of a sleeve pipe of the present invention. FIG. 4 is a perspective view showing a state in which a sleeve lid is attached to an opening of a sleeve tube. 4 is a cross-sectional view showing a state in which a sleeve cover is attached to an opening of a sleeve tube. FIG. 1 is a perspective view showing a state in which a sleeve cover is attached to an opening of a sleeve tube and a cover is further attached. FIG. 1 is a cross-sectional view showing a state in which a sleeve cover is attached to an opening of a sleeve tube and a cover is further attached. FIG. 13 is a perspective view showing a state in which an adhesive body is further attached to an edge portion of the covering body. A cross-sectional view showing the state in which concrete has been poured around the sleeve pipe. FIG. 13 is a diagram showing the removal of the covering body after concrete has been poured. FIG. 11 is a perspective view showing another application example of the method for covering an opening of a sleeve pipe of the present invention, showing the case where it is applied to a through sleeve of a beam material.

The following describes an embodiment of the present invention with reference to the attached drawings.

Figure 1 is a flow chart showing an example of the procedure for forming a sleeve using the method for covering the opening of a sleeve pipe of the present invention, and Figures 2 to 8 show the state of the area around the sleeve pipe at each step. In the example shown here, it is assumed that a sleeve is formed on the floor of a building.

First, the sleeve pipe is placed in the desired position (Step S1). The sleeve pipe is fixed to the formwork that will form the floor, such as a wooden formwork or deck plate, using nails or the like in a specified position that avoids the reinforcement already placed. Next, a sleeve lid is attached to the opening at the top end of the sleeve pipe (Step S2).

The state of the sleeve tube at this stage is shown in Figures 2 and 3. The sleeve tube 1, whose central axis is arranged along the vertical direction, has openings at the upper and lower ends, and the sleeve cover 2 is attached to the opening 1b of the upper end 1a. The sleeve cover 2 is a disc-shaped part with a part whose outer diameter protrudes larger than the sleeve tube end, and a protrusion 2b protrudes from one side of the disc-shaped main body 2a. The outer diameter of the main body 2a is set to be at least larger than the inner diameter of the sleeve tube 1. The protrusion 2b is, for example, a cylindrical member with an outer diameter slightly larger than the inner diameter of the sleeve tube 1. When the protrusion 2b is inserted into the opening 1b of the sleeve tube 1, the protrusion 2b is compressed radially inward by the member that forms the end 1a of the sleeve tube 1 and deforms, and the outer peripheral surface of the protrusion 2b is pressed against the inner peripheral surface of the sleeve tube 1 by the repulsive force that causes the protrusion 2b to return to its original shape, thereby fixing the sleeve cover 2 to the sleeve tube 1. Note that the shape and structure of the sleeve lid shown here are just an example, and various other configurations of the sleeve lid can be used as long as they can be properly attached to the opening of the sleeve tube.

Because there may be openings within the sleeve pipe 1 that span multiple floors, to enhance safety, the sleeve lid 2 may be provided with a warning sign 3, including text such as "Caution when opening" or other appropriate symbols, as necessary. In the example shown in Figures 2 and 3, a sticker with a warning sign printed on it is affixed to the top surface of the main body 2a as the warning sign 3.

The cover 4 is then attached to the bag as shown in Figures 4 and 5 (step S3). The cover 4 is composed of a bag-shaped main body 4a and a fastening portion 4b attached to the edge of the main body 4a.

The main body 4a is a bag-shaped portion formed from a sheet-like material that is impermeable to liquids. For example, resin is a suitable material for the main body 4a, and when a warning display 3 is provided on the sleeve lid 2 as shown in Figures 2 to 5, it is more preferable for the material to be transparent so that the warning display 3 can be seen through the main body 4a. The fastening portion 4b is a stretchable ring-shaped member attached to the edge of the bag-shaped main body 4a, such as a rubber cord.

Such a covering body 4 is attached to the sleeve pipe 1 as shown in Figures 4 and 5. In this state, the main body 4a covers the entire opening 1b together with the sleeve lid 2. The tightening part 4b is attached so as to surround the circumference of the end 1a of the sleeve pipe 1, tightening the end 1a by elastic force, and supporting the entire covering body 4 against the sleeve pipe 1. The edge of the main body 4a of the bag-shaped covering body 4 is in close contact with the outer surface of the sleeve pipe 1 with almost no gap due to the elastic force of the tightening part 4b. This effectively prevents concrete from entering the sleeve pipe 1. Since a normal sleeve lid 2 is not designed to seal the opening 1b, it is difficult to completely prevent concrete from entering, but if the covering body 4 is attached in a way that covers the gap between the sleeve lid 2 and the sleeve pipe 1 as in this embodiment, concrete can be prevented from entering with a simple procedure.

As mentioned above, in the past, when forming a sleeve, the entire end of the sleeve pipe to which the sleeve lid was attached was covered with masking tape, or the end of the sleeve pipe was sealed with pipe sealing tape. However, with such methods, there were problems such as the trouble of applying and removing the tape, the fact that sticky substances remained after removing the tape, and the fact that the tape could not be applied if the sleeve pipe or sleeve lid were wet. With the method using the covering body 4 as in this embodiment, the work of covering the end of the sleeve pipe 1 is very simple, since it is only necessary to cover the end 1a of the sleeve pipe 1 with the covering body 4. In particular, in the case of construction of a machine room, for example, where a large number of sleeves need to be formed, the amount of work can be significantly reduced. Moreover, since the covering body 4 is attached by the elastic force of the tightening part 4b, there is no problem with the attachment even if the sleeve pipe 1 is wet, and there is no need to worry about sticky substances remaining after removal. Furthermore, if the main body part 4a is transparent, the covering body 4 does not interfere with the visibility of the warning display 3.

Note that the dimensions of the fastening portion 4b need to be specifically explained here: the total length of the fastening portion 4b needs to be extended by an external force to at least the diameter of the end 1a of the sleeve tube 1 and the diameter of the sleeve cover 2. In addition, when no external force is applied, the total length of the fastening portion 4b needs to be smaller than the diameter of the end 1a of the sleeve tube 1.

It is particularly convenient to use a commercially available shower cap as the covering 4. A shower cap is a product originally designed for waterproofing, with the main body 4a being made of a material that does not allow liquids to pass through, and the tightening portion 4b being designed to tighten the object with a moderate elastic force. For this reason, it is suitable for use as an attachment to the end 1a of the sleeve pipe 1 to prevent the intrusion of concrete, and is inexpensive. When using a shower cap as the covering 4, it is appropriate to use a sleeve pipe 1 with a diameter of about 20 cm, although this will depend on the dimensions and materials of the main body 4a and tightening portion 4b that make up the shower cap.

After attaching the covering body 4 as shown in Figures 4 and 5, if necessary, the edge of the main body portion 4a may be fixed with an adhesive 5 as shown in Figure 6 (step S4). For example, this is effective as a simple measure to prevent the covering body 4 from coming off the sleeve pipe 1 in cases where there is a concern that the covering body 4 may be blown away by the wind, or where the outer periphery of the sleeve lid 2 does not protrude radially beyond the outer periphery of the sleeve pipe 1, and there is a possibility that the fastening portion 4b of the covering body 4 may easily exceed the outer periphery of the sleeve lid 2 and come off. Even in this case, the covering work requires less effort than the conventional method of covering the entire sleeve lid 2 with masking tape, and even if there is any adhesive remaining after removal, it is kept to a minimum.

The adhesive body 5 may be, for example, an adhesive tape such as masking tape. The adhesive body 5 may be attached around the entire circumference so as to cover the entire edge of the covering body 4 located on the outer periphery of the end 1a of the sleeve pipe 1, or only a portion of the edge of the covering body 4 may be fixed to the surface of the sleeve pipe 1. As long as the covering body 4 can be appropriately attached to the sleeve pipe 1, the form of fixation by the adhesive body 5 may be any.

Next, as shown in Figure 7, concrete 6 is poured around the sleeve pipe 1 without gaps while applying vibration to compact the concrete so that it covers the reinforcing bars arranged to form the floor slab (step S5). In the case of Figure 7, the concrete 6 is poured on the floor surface of the PS or machine room, and the top surface of the concrete 6 is at a lower level than the upper end of the sleeve pipe 1. At this time, the cover 4 is attached to the end 1a of the sleeve pipe 1 and the sleeve cover 2, so that the concrete 6 is prevented from directly adhering to the end 1a of the sleeve pipe 1 or the sleeve cover 2. In addition, concrete and rainwater are prevented from entering the opening 1b of the sleeve pipe 1 while the concrete 6 is curing.

After the concrete 6 has been cured, the covering body 4 is removed as shown in FIG. 8 (step S6). This task is very easy, as it only requires pulling the covering body 4. Even if a part of the concrete 6 adheres to the covering body 4 when the concrete 6 is poured, it easily falls off when the covering body 4 is removed. In addition, if no adhesive is used to secure the covering body 4, there is no need to worry about adhesive remaining on the sleeve pipe 1 or sleeve cover 2, and even if an adhesive body 5 is used as shown in FIG. 6, it is only necessary to remove the minimum amount of adhesive body 5 used, so there is little effort involved and little adhesive residue. The removed covering body 4 can be disposable (a shower cap is inexpensive, so the cost burden is very small), or it can be reused if it is not too dirty or damaged.

After removing the covering 4, if the sleeve pipe 1 is a paper void, it is removed from the hardened concrete 6, but if the sleeve pipe 1 is made of PVC or steel, it is left in place, completing the formation of the sleeve.

Although the above example shows a case where a sleeve is formed when pouring concrete 6 to form a floor, a similar method can be widely applied when it is necessary to cover the end of a sleeve pipe when forming a sleeve in a part other than a floor using a sleeve pipe. For example, a sleeve may be provided to penetrate the steel frame that constitutes the beam of a steel-framed building. Figure 9 shows an example of a sleeve pipe in such a case, in which a sleeve pipe (penetrating sleeve) 8 made of an iron pipe or the like is provided to penetrate horizontally through a beam material 7 that is a steel frame. Such beam material 7 may be sprayed with a fireproof material (not shown) such as rock wool, and in this case, for example, the end of the sleeve pipe 8 may be covered with a sleeve cover 9, and the entire end of the sleeve pipe 8 to which the sleeve cover 9 is attached may be covered with a covering body 10 similar to the covering body 4 shown in Figures 4 and 5. In addition, the edge of the covering body 10 may be fixed with an adhesive body 11 as necessary. In this way, when the fireproof material (not shown) is sprayed, it is possible to prevent the fireproof material from adhering to the end of the sleeve tube 8 or the sleeve cover 9, or from penetrating inside the sleeve tube 8.

As described above, in this embodiment, when forming a sleeve using the sleeve pipe 1, the cover 4, which has a bag-shaped main body 4a and an expandable annular tightening portion 4b attached to the edge of the main body 4a, is attached to cover the sleeve lid 9 fitted to the end portion 1a of the sleeve pipe 1. In this way, the opening 1b of the sleeve pipe 1 can be covered in a simple procedure, preventing the intrusion of concrete.

In the method for covering the opening of a sleeve tube of the present invention, a shower cap can be used as the covering body 4, making it possible to carry out the above method using an inexpensive commercially available product.

In the method for covering the opening of a sleeve pipe of the present invention, the sleeve cover 2 has a portion that protrudes beyond the end of the sleeve pipe with a larger outer diameter, and it is preferable that the annular fastening portion 4b is caught after being attached. In this way, it is possible to more effectively prevent the intrusion of concrete into the end 1a of the sleeve pipe 1 of the covering body 4.

In the method of covering the opening of a sleeve tube of the present invention, after the covering body 4 is attached to the end 1a of the sleeve tube 1, the covering body 4 can be further fixed to the sleeve tube 1 using the adhesive body 5, which makes it easy to prevent the covering body 4 from coming off the sleeve tube 1.

Therefore, according to the present embodiment, the opening of the sleeve tube can be easily and suitably covered.

The method of covering the sleeve tube opening of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention, for example, sleeve lids and warning signs are not necessarily required.

1 Sleeve tube 1a End 2 Sleeve cover 4 Cover (shower cap)
4a Main body portion 4b Fastening portion 5 Adhesive body

Claims (3)

A method for covering an opening of a sleeve tube, comprising the steps of: fitting a sleeve lid to an end of the sleeve tube; and covering the end of the sleeve tube together with the sleeve lid with a covering body, the method comprising the steps of:
The covering body includes a bag-shaped main body and an expandable annular fastening portion attached to an edge of the main body,
The sleeve cover has a portion that protrudes beyond the end of the sleeve tube with a larger outer diameter,
A method for covering an opening of a sleeve tube, characterized in that when covering the end of the sleeve tube together with the sleeve lid with a covering body, the annular tightening portion is attached and hooked onto the large protruding portion of the sleeve lid. 2. The method for covering an opening of a sleeve pipe according to claim 1, wherein a shower cap is used as the covering body. After the covering body is attached to the end of the sleeve tube,
3. The method for covering an opening of a sleeve pipe according to claim 1 or 2 , further comprising the step of fixing the covering body to the sleeve pipe using an adhesive.

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