JP2000018430A - Abutting jig and fixture having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abutting jig which does not peel off antirust paint coated on a surface of a metal pipe even when an outer periphery of the metal pipe is strongly grasped, and also provide a fixture having the jig. SOLUTION: This abutting jig is attached to a fixture A to be fittingly attached to a pipe B. The pipe B is a fittingly attached pipe. The abutting jig has an abutting piece formed on a front and to be abutted against the pipe B, and a shaft part 3 for pressurizing the abutting piece 2 against the pipe B. The abutting piece 2 is pressurized by rotating the shaft part 3. At this time, the abutting piece 2 can be pressurized and abutted against the pipe B without rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abutment jig for an underground pipe and a fixture having the same, and more particularly, to connecting one pipe to another pipe when connecting one pipe to the other pipe. The present invention relates to a contact jig provided on a tool capable of gripping a pipe and a fixture having the same.

[0002]

2. Description of the Related Art Metal pipes having an insertion opening and a receiving opening, respectively,
For example, in a metal pipe such as a straight pipe and a straight pipe, a straight pipe and a deformed pipe, and a deformed pipe and a deformed pipe, one of the metal pipes having the opening is inserted into the other metal pipe having the enlarged diameter receiving port. When trying to connect, it is necessary to center the joints of the two metal tubes facing each other, and to insert the former into the latter while holding the tubes in place. In that case, one pipe was pulled into the other pipe arranged at a predetermined position while being suspended by a wire rope, but this was inefficient because the centering work was troublesome.

Therefore, a tool which can connect both metal tubes with good workability has been considered. In this tool, a substantially horseshoe-shaped fixing tool is fitted on the outer peripheral surface of the metal pipe side having the receiving port and the outer peripheral surface of the metal pipe side having the insertion port, respectively, and both the fixing tools are formed in a rack drive jack type comprising a combination of a rack and a pinion. The two metal pipes can be fixed by erection and connection. Then, a case incorporating a pinion is attached to a fixture fitted and fixed to a metal tube having a socket, and the pinion
By rotating a feed handle attached to the outside of the case, a pinion that meshes with the rack is rotated to bring both metal tubes close to each other, and one tube is inserted into the other tube. In this case, since the pawl is provided in which the pinion rotates only in the direction in which the two metal tubes are brought close by the turning operation of the feed handle, the connecting operation of the two metal tubes is easy. In addition, since the shape of the fixture is substantially horseshoe-shaped, not only the work from below is not required, but also it is not necessary to secure a wide space below, so that the entire piping work is simple. It is convenient. When this tool is used, the centering adjustment work is easy and the operation is simple, so that it is widely used. Similarly, when disassembling the metal pipes, the tool can be used.

[0004]

However, in the above-mentioned prior art tool, the horseshoe-shaped fixture is fitted and fixed to the outer peripheral surface of the metal tube. Inserting a bolt with an edge at the tip into the hole formed by tightening these bolts, the problem is that the anticorrosive paint on the outer peripheral surface of the pipe is peeled off by tightening the bolt. there were. In other words, these bolts are provided with the edge portion in order to securely and firmly grip the metal tube with the fixture, and when the fixture is fitted and fixed to the outer peripheral surface of the tube, the outer peripheral surface of the tube is fixed. The edge of the tip of the bolt cuts into the surface of the metal tube,
Moreover, the paint on the surface layer is strongly rubbed to remove the rust preventive paint covering the metal tube surface. When the surface of the metal tube from which the paint has been peeled off is buried in the soil, it is exposed to the surrounding corrosive atmosphere, and rust may easily progress.

Accordingly, the present invention solves the above-mentioned problems of the prior art, and removes the rust-preventive paint on the pipe surface even if the outer circumference of the pipe such as a metal pipe to be fitted is strongly gripped. It is an object of the present invention to provide an abutment jig and a fixture having the same.

[0006]

The above object is achieved by the invention described in the claims. That is, the characteristic structure of the contact jig of the present invention is that the contact jig is attached to a fixture that can be fitted to the fitted pipe, and is provided at the tip end and can contact the fitted pipe. A contact piece, and a shaft for pressing the contact piece against the fitted pipe, and rotating the contact piece when pressing the contact piece with the rotation of the shaft part. And it can be pressed and contacted with the fitting tube.

With this configuration, when the shaft is rotated and pressed to bring the contact piece into contact with the fitting pipe, the contact piece does not rotate. Even if the pipe is pressed or brought into contact with the pipe, it is merely pressed, so that the rust preventive paint applied to the surface of the pipe to be fitted is not scraped off. Even if a corner is formed on the contact surface side of the contact piece, the rust-preventive paint on the surface of the fitted pipe will not be scraped off unless the tip has a sharp edge. Therefore, even if the gripping function of the fitted tube is strengthened at this portion by providing a corner portion on the contact surface side of the contact piece, the rust preventive paint on the fitted tube surface is not peeled off. Therefore, the gripping function of the contact piece can be reliably enhanced. as a result,
By using the contact jig of the present invention, it was possible to provide a contact jig which does not peel off the rust-preventive paint on the tube surface even if the outer periphery of the tube to be fitted is strongly gripped.

The contact piece is partially embedded in a contact piece holder that can be connected to the shaft portion, and the contact piece holder does not follow the rotation of the shaft portion. May be provided. With this configuration, the shaft portion and the contact piece holder can be configured as separate members, even if the contact piece is pressed against the fitting tube while rotating the shaft portion, This is preferable because the rotation of the contact piece can be reliably prevented.

[0009] The contact piece may be made of a material softer than the fitting pipe. This configuration is preferable because even if the contact piece is strongly contacted with the fitting pipe, there is no possibility of damaging the surface thereof and the rust preventive paint is not peeled off. When the pipe to be fitted is a buried pipe in the soil, generally, it is a cast iron pipe,
Particularly, since it is made of ductile cast iron, various materials can be selected as a softer material, and a copper alloy such as a bronze material having excellent corrosion resistance can be selected from these materials, which is preferable.

[0010] The contact surface side of the contact piece may be formed in a concave shape. If the shape matches the curvature of the pipe to be fitted, the contact area between the surface of the contact piece and the surface of the pipe to be fitted can be increased, and the gripping of the pipe to be fitted by the contact jig is stable and reliable. Even if the shape does not match the curvature of the pipe to be fitted, both ends of the contact piece become corners and bite into the surface of the pipe to be fitted, so that This is preferable because the fitting tube can be stably and securely gripped.

Further, the characteristic structure of the fixture according to the present invention is as follows.
One of the above-mentioned contacting jigs is mounted, and the fitting jig can be fitted to the fitting tube. With this configuration, even if the contact jig strongly grips the outer periphery of the metal pipe as the fitting pipe, the rust preventive paint on the surface of the metal pipe is not peeled off. In addition, a fixture that does not harm the fitted tube can be provided.

[0012] A rotation stopper for preventing rotation of the contact piece may be provided on the inner surface side of the mounting location of the contact jig. With this configuration, even if the contact piece is advanced toward the fitted pipe side to make strong contact with the surface of the fitted pipe, the surface of the fitted pipe is rotated by the rotation of the tip of the contact piece. It is preferable that the rust preventive paint is securely removed.

[0013]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the front structure of a substantially horseshoe-shaped fixture A to be fitted to a duct pipe B made of ductile cast iron, and the right half shows a cross-sectional structure. FIG. 2 also shows a side structure of the fixture A. The fixture A has three contacting treatments that contact the fitted pipe B from the outer peripheral side toward the center side (the fitted pipe side) at three locations, that is, the left and right end portions and the central portion (top portion). Tool 1
Can be attached. That is, the fixing tool A is provided with the screw holes for mounting the contact jig 1 at the three positions. Further, near the left and right ends of the fixture A, approximately C
A tube-shaped fixture (shown in the figure) having a protruding portion C having a U-shape and having an enlarged-diameter receiving port facing a fitting tube B having an insertion opening to which the fixing device A is fitted. (Abbreviation) and the fixture A can be installed by adopting a rack drive jack type comprising a combination of a rack and a pinion. And
In order to insert the pipe to which the fixture A is fitted into a pipe (not shown) facing the pipe, a feed handle (ratchet handle) provided on the fixture fitted on the outer periphery of the receiving-side pipe. (Not shown), the pinion interlocking with the handle is rotated on the rack, and the left and right protrusions C are drawn toward the receiving pipe. Reference numeral 10 denotes a handle for facilitating fitting of the fixture A to the fitting tube B.

The contact jig 1 is provided at a tip end thereof and can be brought into contact with the fitting pipe B. The contact jig 1 is pressed by the fitting piece 2 against the fitting pipe B to make contact. A shaft portion 3 to be contacted and a hexagonal head portion 4 formed integrally with the shaft portion 3 and having a shape similar to that of a normal bolt head are provided. The shape of the head portion 4 is not particularly limited as long as the shaft portion 3 can be rotated, and may be a quadrangle, a triangle, or another shape. A thread groove which can be screwed to the fixing tool A is formed on the outer periphery of the shaft part 3 like a normal bolt, and as the head part 4 is rotated using a tool or the like, the contact jig 1 is moved. It is configured to be able to advance and retreat with respect to the fixture A. The contact piece 2 provided at the distal end of the contact jig 1 is partially embedded in the contact piece holder 5, and the contact piece holder 5
Is fixed with screws 6. Of course, instead of fixing the contact piece 2 to the contact piece holder 5 with the screw 6, the contact piece 2 may be fixed to the contact piece holder 5 using an adhesive, or other fixing means. You may fix using. Instead of fixing the contact piece 2 to the contact piece holder 5 as a separate member,
Both may be created integrally from the beginning.

The contact piece holder 5 can be detachably attached to the tip of the contact jig 1. That is, as shown in FIG. 3, a threaded portion 3 a having the same size as the shaft portion 3 and separated from the shaft portion 3 is formed at the distal end portion of the contact jig 1. The threaded portion 5a of the contact piece holder 5 can be screw-connected. A space 8 is formed between the threaded portion 5 a of the contact piece holder 5 and the embedded side of the contact piece 2, and the threaded portion 3 a of the shaft portion 3 fits into the space 8. It is possible. Contact piece 2
Is connected to the shaft portion 3 to make contact with the fitted tube B, which will be described later.

The surface of the contact piece 2 is formed in a somewhat concave arc shape. The left and right ends form a corner as shown in FIG. 3 in an enlarged manner.
When contacting the outer periphery of the fitting tube 2, the corner of the contact piece 2 can bite into the outer periphery of the fitting tube B. By doing so, the holding jig B can be firmly gripped by the contact jig. However, as described later, even if the tip of the contact piece 2 of the present embodiment is made to bite into the outer circumference of the fitted pipe B, the rust-preventive paint applied to the outer circumference of the fitted pipe B is not removed. There is no peeling. However, even if the right and left ends of the contact piece 2 are not formed at the corners, if the curvature of the arc of the surface of the contact piece 2 matches the curvature of the fitted pipe, This is preferable because the contact area between the surface of the contact piece and the surface of the fitting tube can be increased, and the fitting jig can stably and reliably grip the fitting tube. The contact piece 2 is made of bronze cast (a bronze casting). In this case, when the fitting pipe B is made of ductile cast iron, the contact piece 2 is made of a softer material, so that there is no possibility of damaging the surface of the fitting pipe B, which is more preferable. .

Next, a method for bringing the contact piece 2 into contact with the fitted pipe B will be described. First, the contact piece holding portion 5 is detached from the contact jig 1, and the contact piece holding portion 5 is disposed at the contact jig mounting portion on the inner surface side of the fixing tool A. Then, the shaft portion 3 of the contact jig 1 is inserted from the outer peripheral side of the fixture A into the screw holes provided at three places of the fixture A while rotating. Since the contact piece holding portion 5 is disposed on the inner surface side of the fixing tool A, the threaded portion 5a of the contact piece holding device 5 is screwed with the threaded portion 3a at the tip of the shaft portion 3. FIG. 3 (a) shows a state in which a contact piece holder 5 in which the contact piece 2 is partially embedded is screwed into the threaded portion 3a at the tip of the shaft portion 3 (fixing tool A is simplified. (Not shown). Further, FIG. 3B shows that the head portion 4 is further rotated to advance the threaded portion 3a at the tip of the shaft portion 3 so that the threaded portion 5a of the contact piece holder 5 and the threaded portion at the tip of the shaft portion 3 are threaded. 3 shows a state in which the screw engagement with the portion 3a is released, and the threaded portion 5a of the contact piece holder 5 faces a position facing the outer periphery of the reduced diameter portion 3b of the shaft portion 3. When the fixing tool A is fitted to the outer peripheral surface of the fitting pipe B, the contact piece 2 is excessively protruded in the state of FIG. 3A (the contact fixation attached to the left end in FIG. 1). (State shown in tool 1)
Therefore, when the fixing tool A is fitted to the outer peripheral surface of the fitting pipe B from above, the fixing tool A cannot pass through the maximum diameter position of the fitting pipe B in a plan view, and is fixed. The tool A cannot be arranged at a stable fitting position. Therefore, at the time of actual construction, the fixture A is fitted to the outer peripheral surface of the fitting pipe B after the state shown in FIG. 1 is the state shown by the contact jig 1 attached to the right end part). By doing so, the contact piece 2 can be retracted toward the shaft portion 3 from the state shown in FIG. 3A, and as shown in FIG. The fitting can be performed at a position below the maximum diameter position of the tube B, and the fitting of the fixing tool A to the outer peripheral surface of the fitted tube B can be stabilized. Thereafter, the head 4 of the contact jig 1 is rotated and tightened using a spanner, a hexagonal ratchet or the like.

Here, as shown in FIG. 4, the cross section of the contact piece 2 is circular, but the contact piece holder 5 is formed in a square appearance. When the contact piece holder 5 is formed in a square shape, the contact piece holder 5 is rotated when the contact jig 1 is rotated and the shaft 3 is advanced toward the fitting tube B. Even if it is attempted to rotate together with the part 3, since the wall surface 7 of the fixture A is formed in a shape facing the side surface of the square contact piece holder 5, the side surface of the contact piece holder 5 is The rotation of the contact piece holder 5 is prevented by hitting the wall surface 7.
As described above, the contact piece holder 5 does not rotate depending on the rotation of the shaft 3. Therefore, since the contact piece 2 does not rotate, even if the shaft portion 3 is further rotated in a state where the contact piece 2 is in contact with the surface of the fitting tube B, the corner of the end of the contact piece 2 is formed. Just by pressing against the surface of the fitting tube B, the rust-proof coating on the surface of the fitting tube B is not stripped. Here, the fixture A
The wall surface 7 of the contact piece constitutes a detent part for preventing rotation of the contact piece holder 5, and the structure of the contact piece holder 5 having a rectangular cross section has a structure for preventing rotation of the contact piece holder 5. Construct a stop mechanism. However, the shape of the contact piece holder 5 does not have to be a quadrangle in cross section in relation to the wall surface 7 of the fixing tool A, and may be triangular or other polygonal shapes as long as the rotation of the contact piece holder 5 can be prevented. . The cross section of the contact piece 2 may be circular or square, or may have another shape.

As the head portion 4 of the contact jig 1 is rotated, the threaded portion 3a of the shaft portion 3 is rotated as shown in FIG.
The screwing relationship between the screw and the threaded portion 5a of the contact piece holder 5 is released, and the shaft 3 moves forward, and the tip end thereof contacts the upper surface of the space 8 of the contact piece holder 5. . In this state,
When the head 4 is further rotated, the shaft 3 brings the contact piece 2 of the contact piece holder 5 into contact with the outer peripheral surface of the fitting tube B, and comes to press. Here, even if the contact piece 2 is pressed against the outer peripheral surface of the fitting pipe B by strongly rotating the head portion 4, only the grip of the fitting pipe B by the fitting piece 2 is strengthened. The surface of the fitting tube B is not damaged.

[Another Embodiment] (1) The number of contacting jigs to be attached to the fixture A is not limited to three, but may be smaller if the contact area can be increased to some extent. May be increased.

(2) The contact piece shown in the above embodiment has a concave surface on the contact surface side, but does not necessarily have to be concave, and may be a flat surface. Further, instead of forming the corners at the left and right ends, a lattice-shaped pattern may be included or a plurality of protrusions may be formed. Further, the shape may be such that the radius of the corner is increased and the corner is almost eliminated. In short, what is necessary is just to be able to contact and hold the surface of the fitted tube B.

(3) In the above embodiment, a ductile cast iron pipe is used as a pipe to be fitted. However, the present invention may be used for other metal pipes or a resin pipe.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a fixture equipped with a contact jig according to the present invention.

FIG. 2 is a right side view of the fixing device of FIG. 1;

FIG. 3 is an enlarged view of a main part for explaining the function of the tip of the contact jig.

FIG. 4 is a bottom view of the tip of the contact jig.

[Description of Signs] 1 Contacting jig 2 Contacting piece 3 Shaft 5 Contacting piece holding tool 7 Detent part A Fixing tool B Fitting tube

Claims (6)

[Claims] 1. A contacting jig attached to a fixture that can be fitted to a fitting tube, the contacting jig being provided at a tip end and being capable of contacting the fitting tube. A shaft for pressing the contact piece against the fitting pipe, and when pressing the contact piece with the rotation of the shaft part, the fitting pipe is not rotated without rotating the contact piece. A contact jig that can be pressed and contacted with. 2. The contact piece is partially embedded in a contact piece holder that can be connected to the shaft portion, and the contact piece holder does not follow the rotation operation of the shaft portion. The contact jig according to claim 1, further comprising a stop mechanism. 3. The contact jig according to claim 1, wherein the contact piece is made of a material softer than the fitting tube. 4. The contact jig according to claim 1, wherein a contact surface side of said contact piece is formed in a concave shape. 5. A fixing tool to which the contact jig according to claim 1 is attached and which can be fitted to a fitting pipe. 6. The fixing device according to claim 5, further comprising a detent portion for preventing rotation of the contact piece on an inner surface side of a mounting portion of the contact jig.