JP2013002503A - Hole diameter expander and hole diameter expanding method for existing sleeve for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for expanding a hole diameter of a sleeve, for inserting a new pipe having the same diameter as an old pipe or a larger diameter than the old pipe into a sleeve hole, without crushing the sleeve, after removing an existing pipe deteriorated in a building from a sleeve part.SOLUTION: The tool is this hole diameter expander of an existing sleeve for a pipe having a shaft part and a columnar or truncated cone-shaped cutting part (here, this cutting part has a shape of a spur gear shape, a helical gear shape or a double helical gear shape, by forming a plurality of teeth parts on its outer peripheral surface) arranged in one end part of the shaft part and coaxially arranged with the shaft part.

Description

  The present invention relates to a hole diameter expander and a hole diameter expansion method for an existing sleeve for piping. More specifically, in order to insert a new pipe having the same diameter as the old pipe or a diameter larger than the old pipe into the sleeve hole without crushing the sleeve after the old pipe in the building is removed from the sleeve portion. And a jig and method for expanding the hole diameter of a sleeve.

When existing pipes such as water supply pipes, drain pipes, gas pipes, etc. in detached houses, condominiums, business buildings, etc. are aged, some or all of the pipes need to be updated. Such renewal work is usually carried out with the building itself in operation.
In many cases, these piping facilities, in particular, water supply / drainage pipes and gas pipes are connected in the axial direction via a sleeve in a piping space communicating with upper and lower floors, for example. In this case, the sleeve part is a hole that penetrates a concrete floor board (slab concrete) and has a diameter larger than the outer diameter of the pipe, and the gap between the outer periphery of the pipe and the floor board in the sleeve part is filled with mortar. Has been. Usually, cinder concrete is laid on the floor.
When replacing existing piping having such a structure, conventionally, after cutting and removing a part of the piping located between the sleeves, the cinder concrete and mortar of the sleeve portion is crushed and the piping penetrating the sleeve portion is used. A method of installing a new pipe after extraction is adopted. Depending on the diameter of the existing pipe, when crushing the sleeve part, a noise of about 100 dB continues for about 90 minutes per house at a radius of about 2 m from the pipe dismantling location, and about 80 dB on the upper and lower floors of the dismantling housing Noise will be generated for the same amount of time.

In view of the above circumstances, the applicant of the present application invented a novel method for disassembling an aging existing pipe in a building, and previously filed a patent application (Japanese Patent Application No. 2010-257102). In this method, a part of the old pipe connected through the sleeve is cut and removed, and the remaining pipe is pulled up from the sleeve by pushing it up with a jack. According to this method, noise and vibration associated with the crushing operation of the sleeve are not generated, and it is an excellent method capable of rapid construction as compared with the conventional method. Since the sleeve can be left without being crushed, the sleeve can be reused.
However, since the hole drilled in the remaining sleeve has the same diameter as the old pipe, in order to insert a new pipe having the same diameter or larger diameter into the existing sleeve hole, the hole diameter of the sleeve is slightly reduced. It is necessary to widen (for example, about 2 to 5 mm in diameter). However, since the conventional pipe renewal method is based on the premise that the sleeve portion is crushed and relaid, there has been no jig and method for expanding the hole diameter of the existing sleeve in the industry.

The present invention has been made in view of the above-described present situation, and the purpose thereof is to remove the old pipe existing in the building from the sleeve portion, and then the same diameter as the old pipe or the old pipe without crushing the sleeve. In order to insert a new pipe having a diameter larger than that of the pipe into the sleeve hole, a jig and a method for expanding the hole diameter of the sleeve are provided.
The above is a problem that appears for the first time by the technique of the prior application by the applicant of the present application, and the industry has not yet recognized that such a problem exists.

According to the present invention, the above objects and advantages of the present invention are, firstly,
A cylindrical or frustoconical cutting portion provided at one end of the shaft portion and the shaft portion and arranged coaxially with the shaft portion (however, this cutting portion has a plurality of tooth portions formed on the outer peripheral surface thereof. And having a spur gear shape, a helical gear shape, or a helical gear shape).
The above objects and advantages of the present invention are, secondly,
Attach the shaft of the above-mentioned existing pipe hole diameter expander to the drill,
The drill is operated in a state in which at least a part of the cutting portion of the hole expander for the existing sleeve for piping is inserted into the existing sleeve for pipe, and this is achieved by the method for expanding the hole diameter of the existing sleeve for pipe. .

  According to the hole diameter expansion method for an existing sleeve for piping according to the present invention using the hole diameter expander for the existing sleeve for piping according to the present invention, the hole diameter of the sleeve can be easily expanded after the old pipe is removed from the existing sleeve portion. Therefore, a new pipe having the same diameter as the old pipe or a larger diameter than the old pipe can be inserted into the sleeve hole without crushing the sleeve.

The component diagram which comprises an example of the embodiment of the hole diameter expander of the existing sleeve for piping of this invention. The assembly drawing of an example of the embodiment of the hole diameter expander of the existing sleeve for piping of this invention. The perspective view of an example of the embodiment of the hole diameter expander of the existing sleeve for piping of this invention. The components figure which comprises another example of the embodiment of the hole diameter expander of the existing sleeve for piping of this invention. The assembly figure of another example of the embodiment of the hole diameter expander of the existing sleeve for piping of the present invention. The perspective view of another example of the embodiment of the hole diameter expander of the existing sleeve for piping of this invention. Process drawing for demonstrating the construction example of the dismantling method of the water supply pipe | tube in an Example.

<Pipe diameter expander of existing sleeve for piping>
A hole diameter expander for an existing sleeve for piping according to the present invention includes a shaft portion, and a columnar or truncated cone-shaped cutting portion provided at one end portion of the shaft portion and arranged coaxially with the shaft portion. .
The shaft portion serves as a motion transmission part when the hole expander of the present invention is mounted on a drill and used, so that it resists rotation and vibration during drill operation, and the motion generated by the drill is transmitted to the cutting portion. It is preferable to have a shape, size, and material that can be sufficiently transmitted.
As for the shape of the shaft portion, the outer shape thereof is preferably a columnar shape, a polygonal columnar shape, or a combination thereof. That the shape of the shaft portion is a combination of the above shapes means a case where the cross-sectional shape changes along the length direction of the shaft portion. The shaft portion may have a cylindrical shape having a hollow portion or a solid body having no hollow portion. As the outer shape of the shaft portion, a cylindrical shape is preferable because sufficient strength is ensured and molding is easy. In addition, the shaft portion may have a connection portion for easily and surely mounting on the drill on the drill mounting side.
The width of the shaft (diameter of the cross section cut in a direction perpendicular to the length direction (in the case of a cylindrical shape) or the length of the longest diagonal (in the case of a polygonal column). The shaft has a connection part to the drill. In this case, the portion excluding the connection portion can be arbitrarily set within a range in which the motion is reliably transmitted from the drill, for example, 15 to 30 mm, and 15 to 20 mm. It is preferable to do.

The connection part to the drill that the shaft part can optionally have the same shape as the connection part of a well-known drill bit (drill blade) or a shape similar thereto, and the chuck shape of the drill to be used In addition, it can be designed appropriately. Examples of the shape of the connection part include a straight shank nose type, a taper shank, an SDS (Steck, Dreh, Sitzt) plus type, and an SDS-max type. For example, the connecting portion has an average value of the width (the same meaning as described above as the width of the shaft portion) of 8 to 13 mm, preferably 8 to 12 mm, and a length of 68 to 80 mm, preferably 68 to 73 mm. It can be. The connecting portion may be changed in several steps (for example, 2 to 4 steps) in width along the length direction, with a height of about 0.2 to 1 mm and a width at the bottom of about 0.5 to 2 mm. One or more circumferential ribs may be provided.
The length of the shaft portion (the length including the connecting portion if it has a connecting portion) can be appropriately set within a range in which the below-described hole diameter expanding operation can be performed without hindrance, for example, 300 to 500 mm. 300 to 400 mm is preferable, and 300 to 340 mm is more preferable.
As a material constituting the shaft portion and the connection part, it is preferable to use a metal, and more preferable to use steel, from the viewpoint of ensuring sufficient strength. Examples of the steel include carbon steel, alloy steel, nickel chrome steel, nickel chrome molybdenum steel, chrome steel, chrome molybdenum steel, and manganese steel. When the shaft portion has a connection part, the material constituting the shaft part and the material constituting the connection part may be the same or different.
When the shaft portion has a connection portion, they may be integrally formed, or may be separately formed and then connected by an appropriate method (for example, welding).

The cutting portion has a columnar shape or a truncated cone shape, and is arranged coaxially with the shaft portion. The cutting portion has a plurality of tooth portions formed on the outer peripheral surface thereof, and has a spur gear shape, a helical gear shape, or a helical gear shape.
The size of the cutting portion needs to be small enough to insert at least a part thereof into the existing sleeve hole in order to expand the hole diameter of the existing sleeve. Here, when the cutting part has a cylindrical shape, it is preferable that the entire cutting part can be inserted into the existing sleeve hole.
On the other hand, even when the cutting part has a truncated cone shape, the whole cutting part may have a size that can be inserted into the existing sleeve hole. However, in this case, a part of the truncated cone-shaped cutting portion, that is, only a certain height from the bottom surface side of the smaller diameter of the truncated cone is inserted into the existing sleeve hole, and the remaining portion is not inserted. Such a configuration is preferable in that the expanded hole can be made closer to a perfect circle. Here, the degree of initial insertion in the sleeve hole in the cutting portion is preferably 10 to 80% of the height (h) of the cutting portion, and more preferably 20 to 60%. In order to enable such partial insertion, it is preferable that the truncated cone-shaped cutting portion is configured such that the bottom surface having the larger diameter is on the shaft portion side.
On the other hand, when the dimension of the height (h) of the cutting part is too small, the distance that the operator moves the drill during the hole diameter expanding operation becomes too long, and the workability is inferior. Considering both of these requirements, the diameter (d) of the cylinder or the smaller diameter (d ′) of the bottom surfaces of the truncated cones is preferably 3 to 20 mm smaller than the hole diameter of the existing sleeve. It is more preferable that it is smaller by about 10 mm. The ratio (d / h or d ′ / h) between the diameter (d) of the cylinder in the cutting portion or the smaller diameter (d ′) of the bottom surface of the truncated cone and the height (h) is 1.6 to It is preferable that it is 3.5, and it is more preferable that it is 2-3.
The preferable values of the diameter (d or d ′) and the height (h) are as follows according to the hole diameter of the existing sleeve (and hence the nominal diameter of the old pipe).

The cutting portion has a gear-like shape with a plurality of tooth portions formed on the outer peripheral surface thereof, but the diameter (d or d ′) is understood as a dimension including the outer edge of the tooth portion. Should.
When the cutting part is on a truncated cone, the taper angle (the outermost point of the bottom surface with the larger diameter and the outermost point of the bottom surface with the smaller diameter in the cross section obtained by cutting the truncated cone along the plane including the central axis) Is preferably 10 ° or less, more preferably 1 to 7.5 °, and particularly preferably 3 to 5 °. Is preferred.
The cutting portion has a plurality of tooth portions formed on the outer peripheral surface thereof, and has a spur gear shape, a helical gear shape, or a helical gear shape. Here, the spur gear means a gear in which teeth are cut parallel to the rotation axis and tooth traces are arranged on the cylindrical surface or the truncated cone surface parallel to the axis;
A helical gear is a gear whose teeth are cut obliquely to the axis of rotation and whose tooth traces are arranged at an angle with the axis on a cylindrical surface or a truncated cone surface; The above-mentioned helical gear is a gear having a shape in which two helical gears are stacked in opposite directions, and tooth traces are arranged in a “<” shape on a cylindrical surface or a truncated cone surface.
In the helical gear or the helical gear, the angle formed by the tooth trace and the shaft is preferably 5 ° or less, and more preferably 3 ° or less.

The number of teeth of the cutting part is preferably 8 to 48, more preferably 16 to 42, and still more preferably 20 to 36. These teeth are preferably arranged substantially evenly on the cylindrical surface or the truncated cone surface of the cutting part.
The height of the tooth of the gear in the cutting part can be 5 to 15 mm, for example, and is preferably 7 to 12 mm.
As the tooth shape of the cutting part, any tooth profile known as a gear can be suitably applied. For example, a parallel tooth, a high tooth, etc. can be used, and an involute curve, a cycloid curve or a tocoloid curve is used. Involute gears, cycloid gears or tocolloid gears.
As the material constituting the cutting portion, the materials exemplified above can be appropriately selected and used as the material constituting the shaft portion from the viewpoint of ensuring sufficient strength. The material constituting the cutting part may be the same as or different from the material constituting the shaft part or the connection part.
The cutting portion may be formed integrally with the shaft portion, or may be formed separately and then connected by an appropriate method (for example, welding). In the case of connecting after forming the cutting part and the shaft part separately, from the viewpoint of ensuring the necessary strength, a hole for receiving the shaft part is formed around the central axis of the cutting part, and the shaft is inserted into the hole. It is preferable to connect by inserting a part of the part and then performing welding. In this case, the depth of the hole (that is, the length of the shaft portion received by the cutting portion) is preferably 30% or more of the height (h) of the connecting portion, and is preferably 50% or more. More preferably, it is more preferably 75% or more. When a part of the shaft portion is inserted and connected into the hole of the cutting portion, the length of the shaft portion should be understood as not including the insertion portion to the cutting portion.

The specific mode of the hole diameter expander of the existing sleeve for piping according to the present invention will be described in more detail with reference to the attached drawings.
FIGS. 1 to 3 show an example of an embodiment of a hole expander for an existing sleeve for piping according to the present invention. This hole diameter expander is a jig for expanding a hole left in a sleeve after removal of an existing pipe having a nominal diameter of 80Φ.
FIG. 1 is a component diagram constituting an example of a hole expander of an existing sleeve for piping. The part 1 is a cutting part, the part 2 is a shaft part, and the part 3 is a part that becomes a connecting portion of the shaft part. The diameter (d) of the cylinder in the cutting part is 84 mm, the height (h) is 40 mm, and the ratio (d / h) between them is about 2.1. The component 2 is a component that becomes a part of the shaft portion, and has a diameter of 20 mm and a length of 340 mm. The component 3 is a component that becomes a connecting portion of the shaft portion, and has an SDS plus shape having a diameter of 10 mm. Although the component 2 is connected to the component 3 to form a shaft portion, care must be taken in evaluating the length of the shaft portion. That is, since this embodiment is a mode in which a part of the shaft portion is inserted and connected in the hole of the cutting portion, the shaft portion does not necessarily match the length required for the component that is the precursor. The cutting part of the part 2 has a hole with a diameter of 20 mm for receiving the shaft part around the central axis. This hole penetrates the cutting part, so that the shaft part is received by the cutting part by a length equal to the height of the connecting part and then connected to the cutting part. Therefore, the length of the shaft part is It is evaluated as a value (368 mm) obtained by subtracting the length (40 mm) received by the cutting portion from the total length ((340 + 68) mm).
FIG. 2 is an assembly diagram of the hole diameter expander of the existing sleeve for piping according to the components of FIG. FIG. 2 shows that the components are connected by welding.
FIG. 3 is a perspective view of the hole diameter expander of the existing sleeve for piping according to the components of FIG. According to FIG. 3, it is understood that the cutting portion of the hole expander has a spur gear shape having 19 teeth. The tooth type is a normal tooth. Referring to FIG. 1, it can be seen that the height of each tooth constituting the gear is 9 mm.

4 to 6 show another example of the embodiment of the hole diameter expander of the existing sleeve for piping of the present invention. This hole diameter expander is another example of a jig for expanding a hole left in a sleeve after removal of an existing pipe having a nominal diameter of 80Φ, as in the embodiment of FIGS.
The embodiment of FIGS. 4-6 is generally similar to the embodiment of FIGS. 1-3, but differs in that the cutting portion of the part 1 is frustoconical. In this cutting part, the diameter (d ′) of the smaller bottom surface is 83.81 mm, the diameter of the larger bottom surface is 88 mm, and the height (h) is 36 mm. The value of the ratio d ′ / h is about 2.3. The taper angle of the truncated cone constituting this cutting part is about 3.3 °. Referring to FIG. 5, the cutting part is configured such that the bottom surface having the larger diameter is on the shaft part side. When such a cut portion is applied to a sleeve hole having a nominal diameter of 80Φ, about 42% of the height of the cut portion is initially inserted into the sleeve hole, and the remaining portion of about 58% (21 mm) is outside the hole. Will be located. The number of gear teeth of the cutting part is 25. The other aspect is the same as the hole diameter dilator of FIGS.
Each of the specific examples shown in FIGS. 1 to 6 is a specific example in the case where the nominal diameter of the old pipe is 80Φ and a preferable drill described later is used. The hole diameter of the sleeve, the material of the sleeve, and the drill to be used It will be within the ability of those skilled in the art to appropriately modify and apply the above specific examples according to the performance, work environment, and the like.

<Method for expanding hole diameter of existing sleeve for piping>
The diameter expansion method of the present invention using the above-described existing sleeve diameter expansion device for piping according to the present invention will be described below.
The method of expanding the hole diameter of the existing sleeve for piping according to the present invention is to attach the shaft portion of the hole diameter expander of the existing sleeve for piping of the present invention as described above to the drill
The drill is operated in a state in which at least a part of the cutting portion of the hole expander of the existing sleeve for piping is inserted into the existing sleeve for piping. Here, the meaning of inserting at least a part of the cutting portion is as described above with respect to the cutting portion.
The chuck portion of the drill to be used needs to be able to grasp the shaft portion (if the shaft portion has a connecting portion, the connecting portion). The drilling ability of the drill is preferably 20 mm or more, and more preferably 20 to 26 mm for concrete. As a drill rotation speed, it is preferable to set it as 800-1,000 rpm, for example, and it is more preferable to set it as about 900 rpm.
It is preferable to use a drill called a vibration drill or a hammer drill that vibrates in the axial direction while rotating. When using a vibration drill, the number of strikes (frequency) is preferably 3,000 to 4,500 times / minute, and more preferably about 4,000 times / minute.
When the shaft portion of the hole expander has a connection part, it is preferable to connect to the drill through the connection part.

The cutting part of the hole expander of the existing sleeve for piping of the present invention connected to the drill as described above is inserted into the existing sleeve for piping, and the drill is operated in that state. Then, by bringing the tooth portion of the moving cutting portion into contact with the inner wall of the sleeve (and the inner surface of the cinder concrete when laid), the contact portion with the cutting portion can be easily cut. Therefore, by bringing the cutting part into contact with all the circumferential direction and the entire height direction of the inner wall of the sleep hole (and the inner surface of the cinder concrete), it is necessary to insert the new pipe as much as necessary for the new pipe. The hole diameter of the existing sleeve for piping can be expanded uniformly enough.
It is not necessary to expand the hole diameter more than necessary. When a new pipe having the same diameter as the old pipe is used, the diameter of the sleeve may be expanded by, for example, 1 to 6 mm, preferably 1.5 to 5 mm. This expansion operation can be performed in a very short time. For example, it takes only about 5 minutes to expand the hole diameter of the sleeve for the nominal diameter 80Φ by about 2 mm. When using a new pipe having a diameter larger than that of the old pipe, the diameter may be increased to, for example, 1 to 6 mm, preferably 1.5 to 5 mm larger than the diameter of the new pipe in the same manner as described above.
A new pipe having a desired diameter can be easily inserted into the hole of the sleeve thus expanded. After the new pipe is inserted, there is a slight gap between the inner wall of the sleeve and the outer wall of the new pipe. This part may be filled with new mortar, concrete, or the like.

Hereinafter, the present invention will be described more specifically with reference to examples.
Example 1
In this embodiment, an example is shown in which the hole of the existing sleeve formed by the method described in Japanese Patent Application No. 2010-257102 by the applicant of the present application is expanded by the method of the present invention. This example is a construction example in the case where the old pipe is a nominal diameter 80Φ and an inner lining steel pipe for water supply.
FIG. 7 shows a process chart for extracting the old piping in this example.
The water supply pipe of FIG. 7 was connected to the upper floor, the central floor, and the lower floor via a sleeve portion formed on the floor board. In the sleeve part, the piping was fixed to the floor board by sleeve mortar, and cinder concrete was laid on it ("existing").
In disassembling this pipe, first, a part of the middle part of the pipe (about 360 mm in length) was cut and removed on the central floor and the upper floor. Thereby, the lower end part of the pipe cut on the central floor and the upper end part of the pipe cut on the upper floor were generated. Here, the pipe that is connected to the pipe in the lateral direction was also separated from the pipe that should be removed by cutting in advance (“temporary switching / piping cutting”). Here, the piping in the lateral direction of the room was connected to a temporary water supply pipe.
Next, a jack (pressurizer) was installed on the base placed on the floor of the central floor at the lower end of the central floor of the cut pipe. ("Pressurizer setting / pressurization start"). The “pressurizer set / pressurization start” diagram of FIG. 5 is a diagram at the time when the pressurization of the jack is started and the pipe has already been pushed up a little distance. The pipe was continuously pushed up by the jack. After the jack stroke was insufficient, the pipe was further pushed up and pulled out using the jack extension auxiliary jig ("Jack extension auxiliary jig setting / pressurization start").
By the above operation, the old pipe was removed, and a sleeve having a hole having a diameter substantially the same as the diameter of the old pipe (nominal diameter 80Φ) remained.

A hole expander for an existing sleeve for piping as shown in FIGS. Each part of the hole expander is made of carbon steel for mechanical structure S45C, and each part is connected by welding.
Such a hole diameter expander was connected to a vibration drill (manufactured by Robert Bosch GmbH, product number “GBH2-26DRE”) via the connecting portion.
Next, the cutting part of the hole diameter expander was inserted into the hole of the sleeve, and the vibration drill was operated with the following settings.
Drilling capacity: concrete 26mm
Drill rotation speed: 900rpm
Stroke number (vibration frequency): 4,000 times / minute Manually move the drill operated under the above conditions, and connect the cutting part connected to the drill in the circumferential direction of the inner wall of the sleep hole and the inner surface of the cinder concrete. And contact throughout the height direction. By the operation for about 5 minutes, the diameter of the sleeve hole was expanded by about 2 mm to obtain a substantially circular expanded sleeve hole.
After that, a new water supply inner lining steel pipe with a nominal diameter of 80Φ was inserted into the expanded hole, and the pipe in the horizontal direction connected to the temporary water supply pipe was connected to the new pipe, and then the sleeve hole and the new pipe The small gap between them was filled with mortar, and the pipe renewal work was completed.

Claims (6)

A cylindrical or frustoconical cutting portion provided at one end portion of the shaft portion and the shaft portion and arranged coaxially with the shaft portion (however, this cutting portion has a plurality of tooth portions formed on the outer peripheral surface thereof. And a spur gear-shaped, helical gear-shaped or helical gear-shaped shape).   The ratio (d / h or d '/ h) between the diameter (d) of the cylinder in the cutting portion or the smaller diameter (d') of the bottom surface of the truncated cone and the height (h) is 2 to 3. The hole diameter expander of the existing sleeve for piping according to claim 1.   The hole diameter dilator of the existing sleeve for piping according to claim 1 or 2, wherein the number of the tooth portions is 8 to 48.   The hole diameter dilator of the existing sleeve for piping as described in any one of Claims 1-3 whose height of the said tooth | gear part is 5-15 mm. The shaft portion of the hole diameter expander of the existing sleeve for piping according to any one of claims 1 to 4, is attached to a drill,
A method for expanding the hole diameter of an existing sleeve for piping, wherein the drill is operated in a state where at least a part of a cutting portion of the hole expander for the existing sleeve for piping is inserted into the existing sleeve for piping.   The hole diameter expansion method of the existing sleeve for piping according to claim 5, wherein the drill is a vibration drill.

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