JP2001032978A - Pipe joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint structure with simple and quick pipe connection to improve construction. SOLUTION: A seal member 18 is previously mounted on the inner periphery of a pipe 7 having a socket 11 and a push ring 24 is mounted on a flange 15 via bolts 26 and nuts 27 in a temporarily fixed condition. Another pipe 3 is inserted in the inner periphery of the seal member 18 and tightened with the bolts 26 and the nuts 27, so that the seal member 18 is compressed by a thrust member 24 and the seal member 18 is put in close contact with another pipe 3 for the connection of both pipes 7, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure.

[0002]

2. Description of the Related Art In a high-rise building or the like, a main pipe for drainage provided to penetrate each floor, a horizontal pipe connected to the main pipe, and the like are straight pipes of a predetermined length, a straight pipe and a collecting pipe, and the like. Pipes are connected by connecting straight pipes and bent pipes. Generally, these pipes are connected using a flange joint structure as shown in FIG. In this joint structure, the end of one tube 30 is formed in a slightly large-diameter receiving port 31 and a flange 32 projects from the outer periphery of the opening end of the receiving port 31, whereas the other pipe 33 is provided with a receiving port. A push ring (pressing member) 34,
The lock ring 35, the collar 36, the packing 37, and the like are externally fitted in this order (the lock ring 35, the collar 36 may be omitted, and only the push ring 34 and the packing 37 may be externally fitted in this order).

[0003] The other pipe 33 is connected to the receiving port 3.
1 and the flange 32 and the pressing ring 34
Are connected by a plurality of bolts 38 and nuts 39 and tightened to compress the packing 37 and the like to connect the two tubes 30 and 33 to each other in a watertight manner.

[0004]

In the above joint structure,
At the end of the other pipe 33, a packing 37, a press ring 34 and the like are previously mounted in a temporarily fixed state, and after this pipe 33 is inserted into the receiving port 31 of one pipe 30, the flange 32 and the bolt hole 40 of the press ring 34 are inserted. , 41 and bolt 38 insertion,
It is necessary to perform an operation such as tightening of the nut 39.
Since these operations must be performed while maintaining the inserted state of the other pipe 33, the operations are very troublesome, and by repeatedly performing these operations for a plurality of bolts 38, the workability as a whole is considerably deteriorated. Had become something.

[0005] In particular, in the connection between the upper end of the standing main pipe provided between floors of the building and the lower receptacle of the collecting pipe provided on each floor, the connecting pipe of a certain floor is connected from the floor below the standing main pipe. Therefore, if the above joint structure is adopted in this part, it will be necessary to work from a lower floor to a high place and work at a position close to the upper floor, so the bolt fastening as described above The work was even more difficult. In addition, the other pipe 3 is connected to the receiving port 31 of one pipe 30.
When the three ends are inserted, the packing 37 and the like temporarily fixed to the other pipe 33 may be inclined with respect to the receptacle 31.
As a result, there is a possibility that the sealing effect of the two tubes 30 and 33 may be impaired.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a pipe joint structure in which pipes can be connected easily and quickly to improve workability.

[0007]

The present invention employs the following technical means to achieve the above object. That is, according to the present invention, the receiving port 11 of one pipe 7 is connected to the other pipe 3
Are connected by inserting the ends of the pipes, and in a state before the connection of the two pipes 7 and 3, the one pipe 7 is
A pressing member 24 is mounted on the inner peripheral surface of the receiving port 11 to seal the gap between the outer peripheral surface of the other end of the pipe 3 and the receiving port 11, and compresses the sealing member 18 in the receiving port 11 in the axial direction of the pipe. Are mounted in a temporarily fixed state, and the other pipe 3 is inserted into the seal member 18 and the seal member 18 is compressed by the pressing member 24, so that the two pipes 7 and 3 are sealed by the seal member 18. It is characterized in that it is connected in a sealed state.

According to this, before connecting the two tubes 7 and 3, the seal member 18 and the pressing member 24 are mounted on the receiving port 11 side of one of the pipes 7 in advance. The end of the other tube 3 is inserted into the seal member 18, and the seal member 18 is compressed by the pressing member 24 to connect the two tubes 7 and 3. Accordingly, it is not necessary to perform the bolt hole alignment between the pressing member 24 and the flange and the bolt inserting operation after the insertion of the other pipe 3 in the on-site work at the time of construction as in the related art, and the tightening of the pressing member 24 immediately. Work and the like can be performed, and the workability can be improved. Particularly, in the connection between the receiving port 11 of the lower connecting pipe 7 and the upper end of the standing main pipe 3 in the collecting pipe 2, the joint structure of the present invention is used to perform the connecting work. Effort will be reduced.

Here, by temporarily holding the pressing member 24, the other tube 3 can be inserted without any trouble, and the inner circumference of the seal member 18 is larger than the outer diameter of the end of the other pipe 3. If the diameter is increased, the pipe 3 can be inserted more easily. Even in this case, the watertightness of the pipes 7 and 3 is reliably maintained by the compression of the seal member 18 by the tightening of the pressing member 24. On the other hand, by forming the outer peripheral diameter of the sealing member 18 larger than the inner peripheral diameter of the receiving port 11, even before the two pipes 7 and 3 are connected, the inner peripheral surface of the receiving port 11 has the sealing member 18. The outer peripheral surface can be pressed and brought into close contact, and the sealing member 18
Therefore, the other tube 3 can be easily inserted without being inclined or eccentric.

In the seal member 18, it is preferable that the outer peripheral surface on the side of insertion into the receptacle 11 is formed into a tapered surface that becomes tapered. Thereby, the sealing member 1
8 can be easily attached to the receptacle 11. When the seal member 18 is mounted on the receptacle 11, it is preferable to form a chamfer on the outer peripheral edge portion X2 of the seal member 18 that passes through the inner peripheral edge portion X1 of the receptacle 11. Thus, the seal member 18 can be easily attached without being caught in the receiving port 11.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows a piping structure such as a drain pipe in a building or the like. A collecting pipe 2 is fixed to each floor slab 1 of the building, and a vertical main pipe 3 is connected above and below the collecting pipe 2. The horizontal drawing pipe 4 is connected to the upper part of the collecting pipe 2. The collecting pipe 2 is provided with a main body part 5, which is provided above and below the main main pipe 3 to connect the main pipe 3 to the lower main pipes 6 and 7, and a horizontal connecting pipe 8 to which the horizontal drawing pipe 4 is connected. The main body 5 has through holes 9 formed in each floor slab 1.
And is fixed by a mortar 10 or the like.

The pipe joint structure according to the present invention is, for example, shown in FIG.
, Which is usefully employed for connection between the lower connection pipe (one pipe) 7 of the collecting pipe 2 and the upper end of the standing main pipe (the other pipe) 3. 1 and 2 showing this portion in an enlarged manner, the lower connecting pipe 7 has a receiving opening 11 at the end at the end thereof, while the upright main pipe 3 is a straight pipe having an upper end (insertion end). The mouth 3A) is inserted into the receptacle 11. FIG. 1 shows a state before the lower connecting pipe 7 and the main pipe 3 are connected, and FIG. 2 shows a state after the connecting.

In FIG. 1, the receiving port 11 is formed to have a slightly larger diameter via a stepped portion 12 so that the upright main pipe 3 can be inserted. The side (lower side) has a tapered surface 14 that is expanded. A flange 15 protruding radially outward is integrally formed on the outer periphery of the end of the receiving port 11, and a plurality of bolt insertion holes 16 penetrating in the pipe axis direction are provided at predetermined circumferential intervals in the flange 15. Is formed. A seal member 18 is mounted on the inner peripheral surface of the large-diameter portion 13 to seal the space between the large-diameter portion 13 and the outer peripheral surface of the vertical main pipe 3 in a watertight manner. This sealing member 1
Numeral 8 is formed of a synthetic rubber or the like into a tubular shape that can be fitted inside the large-diameter portion 13. The upper portion is formed with a thin portion 19, the lower portion is formed with a thick portion 20, and the upper end of the thin portion 19 has A flange 21 that projects in the direction and is superposed on the step 12 is integrally formed.

The inner peripheral surface of the seal member 18 except for the flange portion 21 is formed as a substantially straight flat surface having no irregularities, so that the outer periphery of the thick portion 20 is stepped relative to the thin portion 19. 22 bulges radially outward through the step 22.
Is formed on a tapered surface that is in surface contact with the tapered surface 14 of the receiving port 11. The seal member 18 is mounted with its lower end protruding from the receptacle 11. The outer diameter of the seal member 18 is formed to be slightly larger than the inner diameter of the receptacle 11, and the seal member 18 is pressed against the inner periphery of the receptacle 11 by its elasticity. Therefore, receptacle 1
The sealing member 18 is tightly fitted without generating a gap between the sealing member 18 and the sealing member 18 in the receiving port 11. The inner peripheral diameter d of the seal member 18 is formed to be larger than the outer peripheral diameter D of the vertical main pipe 3 (inlet 3A), and the inner peripheral surface of the seal member 18 when the vertical main pipe 3 is inserted. There is a gap between them.

A pressing ring (pressing member) 24 formed in a ring shape is temporarily connected to the flange 15. That is, the press ring 24 has a plurality of bolt insertion holes 25 corresponding to the bolt insertion holes 16 on the flange 15 side, and the connection bolts 26 are provided in both the bolt insertion holes 16, 25.
And a nut 27 is screwed onto the connection bolt 26, and the upper surface (the pressing surface 24A) of the press ring 24 contacts the lower end surface of the seal member 18 in a state where the seal member 18 is hardly compressed. In addition, the sealing member 18 is supported so as not to be detached from the receiving port 11 and not to be inclined.

A concave portion 24B is formed on the upper surface of the press ring 24, and the bottom surface of the concave portion 24B is a pressing surface 24A that contacts the lower end surface of the seal member 18. The seal member 18 and the pressing ring 24 are set in advance at the time of shipment from the factory.
Although it is preferable to attach the collecting pipe 2 and the standing main pipe 3 at a construction site or the like, they may be attached to the pipe 1 at a construction site. Lower connecting pipe (one pipe) 7 having the above configuration
When the main pipe (the other pipe) 3 is connected to the lower pipe 1, the floor 3 below the lower connecting pipe 7 is connected to the inlet 3 of the main pipe 3.
A is inserted into the receiving port 11. At this time, since the inner peripheral diameter d of the seal member 18 is formed to be larger than the outer peripheral diameter D of the standing main pipe 3, the standing main pipe 3 can be quickly and easily separated from the floor below the receiving port 11. It can be inserted and labor is reduced.

A seal member 1 is provided on the inner peripheral surface of the receiving port 11.
8, the upper end of the main pipe 3 can be prevented from being caught and displaced or damaged by the seal member 18 when the main pipe 3 is inserted. By protecting the lower end surface of the seal member 18, contact of the main pipe 3 is prevented as much as possible. After the main pipe 3 is inserted, the connecting bolt 26 and the nut 27 are tightened, as shown in FIG.
The press ring 24 is moved in the pipe axis direction toward the flange 15 side, and the inner peripheral surface thereof is brought into close contact with the main pipe 3 by pressing and compressing the seal member 18.

At this time, since the pressing wheel 24, the bolt 26 and the nut 27 are mounted on the flange 15 in advance,
The connection is completed only by simply tightening the connection bolts 26 and the nuts 27, so that the fastening operation from a lower floor to a high place can be easily and efficiently performed. In addition, since the outer peripheral surface of the seal member 18 is in close contact with the inner peripheral surface of the receiving port 11 in advance, when the seal member 18 is compressed by the press ring 24, the seal member 18 largely swells to the inner peripheral side. As a result, the degree of adhesion to the main pipe 3 is increased, and the sealing performance is improved. Further, when the sealing member 18 is compressed upward by the pressing ring 24, the diameter of the sealing member 18 is reduced by the guiding action of the tapered surface 14, whereby the sealing property can be improved.

When the vertical main pipe 3 is detached from the lower connecting pipe 7 for the purpose of replacement or the like, the connecting bolt 26 and the nut 27 are loosened to the extent that they do not come off.
The compression of the seal member 18 by the
By forming a gap between the inner peripheral surface of the pipe 8 and the main pipe 3, the main pipe 3 can be easily separated. Further, in the above embodiment, the outer diameter of the seal member 18 can be formed slightly smaller than the inner diameter of the receiving port 11. In this case, even before the pipes 7 and 3 are connected, the pressing ring 24 can be formed. Thus, the seal member 18 can be held at an appropriate position, and can be brought into close contact with the receiving port 11 by compressing the seal member 18.

FIG. 4 shows a second embodiment of the present invention. In the present embodiment, the thin portion 19 of the seal member 18 is used.
Is provided at an angle θ with respect to the tube axis direction so as to move radially inward toward the distal end side (upper end side), whereby the thin-walled portion to be inserted into the receiving port 11 is provided. The outer peripheral surface of 19 is formed as a tapered tapered surface 19A. Further, when the seal member 18 is mounted on the receptacle 11, the outer peripheral edge part X2 of the seal member 18 passing through the inner peripheral edge part X1 of the receptacle 11,
That is, the outer peripheral edge portion X in the step portion 22 of the thick portion 20
2, a rounded or tapered chamfered portion is formed, and a rounded or tapered chamfered portion is also formed on the inner peripheral edge portion X4 of the thick portion 20 through which the outer peripheral edge portion X3 of the upper end (entrance) 3A of the standing main pipe 3 passes. Are formed.

In the present embodiment, the outer peripheral surface of the thin portion 19 is formed as a tapered surface 19A, so that the seal member 18 can be easily inserted into the receiving port 11. Further, the outer peripheral edge of the seal member 18 is formed. By forming the chamfered portions in the portion X2 and the inner peripheral edge portion X4, the sealing member 18 is prevented from being caught on the receiving port 11 and the insertion port 3A. In addition, it is preferable that each of the chamfers is formed in a radius having a radius of about 2 or 3 mm, and the other components are substantially the same as those in the first embodiment. Description is omitted.

Incidentally, the vertical main pipe 3 is formed of steel, cast iron, resin material, or the like. In particular, in the case of a cast iron pipe, its outer diameter tends to vary (error). Therefore, as shown in the prior art of FIG.
If the seal member (the packing 37) and the like are previously mounted on the standing main pipe (the other pipe) 33, the outer diameter of the sealing member expands and becomes larger as the outer diameter of the standing main pipe is larger. There is a problem that insertion becomes difficult. Conversely, if the outer diameter of the standing main pipe is small, the seal member cannot be firmly mounted, and the seal member may be inclined or eccentric, thereby impairing the sealing performance with the receptacle.

On the other hand, in the present invention described above, the inner diameter of the seal member 18 is set to be larger than the outer diameter of the vertical main pipe 3, and the seal member 18 is
Therefore, it is possible to cope to some extent with variations in the outer diameter of the vertical main pipe 3 within a range smaller than the inner diameter of the seal member 18. The applicant of the present application has proposed a sealing member 1 having a certain size.
An error tolerance of the outer diameter of the main pipe 3 conforming to No. 8 was confirmed by the following experiment.

First, the sealing member 18 having a certain size is
It is attached to four types of receptacles 11 having different inner diameters d3 (see FIG. 4, the same applies hereinafter). This receiving port 11 has an inner diameter d3.
Are −1 mm, ± 0 mm, +1 mm, and +2 mm with respect to the outer diameter (outer diameter of the thick portion) D1 of the sealing member 18.
Seeds. The dimensional tolerance of the bore diameter d3 is (D1
−1 mm) ≦ d3 ≦ (D1 + 1 mm). Two types of push rings 24 are attached to each of the four types of receptacles 11.

The pressing ring 24 has a diameter d4 of the concave portion 24B.
Is +1 mm with respect to the outer diameter D1 of the seal member 18,
+2 mm. The dimensional tolerance of the concave diameter d4 of the press ring 24 is (D1 + 1 mm) ≦ d4 ≦ (D1 +
2 mm), and two of the maximum and minimum are used in the experiment. In a state where the seal member 18 and the respective press rings 24 are attached to the respective receiving ports 11, a plurality of standing main pipes 3 having different outer diameters D2 are inserted, and the bolts 26 and the nuts 27 are fastened with a fixed tightening torque.

Then, a dimension (indicated by T in FIG. 2) between the flange 15 and the press ring 24 at this time is measured. When the dimension T is larger than 0 (when the flange 15 and the press ring 24 do not come into contact with each other), the outer diameter dimension D of the standing main pipe 3 is set.
2 is determined to be suitable for the seal member 18 having a certain size. With the above-described method, data of the dimension T was collected for the pipes 3 and 7 having the nominal diameter of 100 mm, and the suitable conditions were graphed. The results are as shown in FIG.

The seal member 18 and the receiving port 1 used in the experiment
The push ring 24, the standing main pipe 3 (the outlet 3A) have the shape shown in FIG. 4, and the respective dimensions are as shown in FIG. The initial dimension (dimension in a state where the seal member 18 is not compressed) T between the flange 15 and the pressing ring 24 is 1
It is set to 0 mm (= t1- (t4 + t7)).
In the graph of FIG. 5, when the dimension T becomes 0, and when the insertion port 3A cannot be properly inserted into the sealing member 18 (the outer diameter of the insertion port 3A with respect to the inner diameter d1 of the sealing member 18). (When D2 is large) is excluded.

As shown in FIG. 5, the receptacles A to C whose inner diameter d3 is within the dimensional tolerance (the outer diameter D1 of the seal member 18 = 13)
When the sealing member 18 is attached to the receptacles A to C having an inner diameter d3 of 134 to 136 mm with respect to 5 mm, the outer diameter D2 of the outlet 3A is 112 to 115 mm with respect to the inner diameter d1 of the sealing member 18 of 117 mm. If any, the gap dimension T is 0 regardless of which pressing ring 24 is used.
That's all. That is, the relationship between the inner diameter d1 of the seal member 18 and the outer diameter D2 of the outlet 3A is (d1-5 mm) ≦
When D2 ≦ (d1-2 mm), it was found that the inlet 3A (the main pipe 3) could be used.

Further, the above-mentioned relationship is substantially established for the tubes 3 and 7 having other nominal diameters. In addition, receptacles B to D (inner diameter d3 = 135 mm to 137 mm)
When the seal member 18 is attached to the opening 3, it has been found that the outlet 3A having the outer diameter D2 of 113 mm to 116 mm can be used. That is, even if the receptacle D is outside the dimensional tolerance (inner diameter d3 = 137 mm), it can be used depending on the outer diameter D2 of the outlet 3A.
It has been found that the outlet 3A having a wide dimension range of (d1-4 mm) ≦ D2 ≦ (d1-1 mm) can be used.

The present invention is not limited to the above-described embodiment, and can be appropriately changed in design. For example, where the joint structure of the present invention is adopted, straight pipes such as the upper connecting pipe 6 and the main pipe 3 of the collecting pipe 2, the horizontal connecting pipe 8 and the horizontal drawing pipe 4, and the vertical pipes such as the main pipe 3 are connected. It can also be adopted. Further, as the seal member 18, the thin portion 19 can be omitted, and a configuration having only the thick portion 20 can be adopted. The tapered surface 19A is not limited to inclining the entire thin portion 19 radially inward as in the above embodiment,
The outer peripheral surface of the thin portion 19 may be tapered.

[0031]

As described in detail above, according to the present invention,
It is possible to easily and quickly connect the pipes to each other, and to improve the workability.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a state before connection of a pipe joint according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the connection state.

FIG. 3 is a side view showing a piping structure of a building in which the pipe joint of the present invention is adopted.

FIG. 4 is a side sectional view showing an exploded state of a pipe joint according to a second embodiment of the present invention.

FIG. 5 is a graph showing a relationship between an outer diameter dimension of an outlet and a dimension between a flange and a press ring.

FIG. 6 shows a seal member, a receiving port, a press ring,
It is each dimension data of the entrance.

FIG. 7 is a side sectional view showing the structure of a conventional pipe joint.

[Explanation of symbols]

 2 Collecting pipe 3 Standing main pipe (the other pipe) 7 Lower connecting pipe (one pipe) 11 Receptacle 18 Sealing member 24 Press ring (Pressing member)

Continued on the front page (72) Inventor Hiroshi Yagi 7-1-22-2 Minamionkajima, Taisho-ku, Osaka-shi, Osaka F-term in Kubota Enkajima Plant 3H016 AB02 AC01 AD13

Claims (5)

[Claims] 1. A pipe joint structure in which an end of the other pipe (3) is inserted and connected to a receiving port (11) of one pipe (7), wherein the two pipes (7, 3) are connected. In the previous state, the one pipe (7) is provided with a seal member (18) for sealing between the inner peripheral face of the receiving port (11) and the outer peripheral face at the end of the other pipe (3). And a pressing member (24) for compressing the seal member (18) in the receiving port (11) in the tube axis direction.
Is mounted in a temporarily fixed state, and the other pipe (3) is inserted into the seal member (18), and the seal member (18) is compressed by the pressing member (24), so that both of them are compressed. A pipe joint structure characterized in that the pipes (7, 3) are connected in a state sealed by a seal member (18). 2. The pipe joint structure according to claim 1, wherein the inner diameter of the seal member (18) is formed larger than the outer diameter of the end of the other pipe (3). 3. The pipe joint structure according to claim 1, wherein an outer peripheral diameter of the seal member is formed larger than an inner peripheral diameter of the receiving port. 4. An outer peripheral surface of the sealing member (18) on an insertion side into the receiving port (11) is formed as a tapered surface having a tapered shape.
3. The pipe joint structure according to any one of 3. 5. An outer peripheral edge portion (X2) of said seal member (18) passing through an inner peripheral edge portion (X1) of said receptacle (11) when said seal member (18) is mounted on said receptacle (11). The pipe joint structure according to any one of claims 1 to 4, wherein a chamfered portion is formed in (1).