JPH0467077B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is used to connect relatively large pipe bodies, for example, with an outer diameter of 200 mm to 3000 mm, whose outer peripheral surface is formed in a concave and convex wave shape. The present invention relates to a pipe joint and a method for watertightly connecting pipe bodies using the pipe joint.

<Prior art> Pipe joints and their connection methods that have conventionally been used to connect relatively large pipe bodies with an outer diameter of 200 mm to 3000 mm, which have uneven corrugations formed on their outer peripheral surfaces. This is a two-split metal joint with a flange, which is generally called a split joint, and is connected using a joint member whose inner surface has unevenness that fits with the uneven corrugation of the pipe body. Attach it to each end of the pipe body by tightening bolts through packing, then interpose watertight ring-shaped rubber packing between these left and right flanges, and connect these left and right flanges to each other at multiple locations. The method used is to connect by tightening bolts.

<Problems to be Solved by the Invention> However, with such conventional pipe joints and methods, the pipe joint itself not only has a large number of parts and is expensive to manufacture, but also requires time and effort to connect to the pipe body. However, the larger the pipe, the more difficult it is to completely shut off water, and the problem is that the connection part is more likely to leak water.

Therefore, an object of the present invention is to solve these problems, and to provide a structure in which the pipe bodies to be connected are of a relatively simple structure and can be easily manufactured, and furthermore, the connection can be easily made when connecting to the pipe bodies. Therefore, we propose a method for connecting pipes that can connect pipes with the required pressure resistance and reliable watertightness even when the pipes are large in diameter.

<Means for Solving the Problems> The structure of the present invention for achieving the object will be explained using FIGS. 1 to 5 corresponding to the embodiments. The structure of the pipe joint according to the present invention is as follows. This is a pipe joint used to connect large pipe bodies A and A' whose outer circumferential surfaces are formed in a concave and convex wave shape, with the middle part in the axial direction being a large diameter part 1, and both sides being small diameter parts 2,
2, the inner diameter d of the small diameter portions 2, 2 on both sides is slightly larger than the outer diameter d ₁ of the peak portion 11 of the connecting tubes A, A', and the intermediate large diameter Diameter part 1
, the width in the axial direction is L, the inner diameter is D, the pitch in the uneven waveform of the pipes A and A' to be joined is P, and the outer diameter of the valley part 12 is _d2 , then 2P≦L≦10P, d ₁ + (d ₁ - d ₂ )/2≦D≦d ₁ +5 (d ₁ - d ₂ ), and the peripheral wall of the intermediate large diameter portion 1 is This is a structure in which one or more mortar inlets 3 are formed through the mortar inlet.

Further, the configuration of the connection method is a method of watertightly connecting large diameter pipe bodies whose outer circumferential surfaces are formed in a concave and convex wave shape using the pipe joint B as described above,
After fitting the pipe fitting B onto one of the two pipe bodies A and A' to be connected, the cut end surfaces a and a' of the two pipe bodies A and A' to be connected are They are brought into contact with each other, and a tape-shaped material t coated with an adhesive or the like on one side, such as an insulating tape, is wound and adhered onto the contact portion to preliminarily connect the same end surfaces a and a'. Then, the pipe joint B that has been fitted onto one pipe body A is moved toward the other pipe body A', and the preliminary connection part T is moved approximately at the center of the pipe joint B in the axial direction. At the same time, place the mortar inlet 3 of the pipe joint B facing upward, and after doing this, the mortar inlet 3
Then, in the space s between the inner circumferential surface of the intermediate large diameter portion 1 of these pipe fittings B and the outer circumferential surface of the connecting pipes A and A', a mortar M that hardens itself over time, such as cement mortar, is applied. The space s is filled with mortar M, and the mortar M is left as is for a required period of time to harden the mortar M.

<Function> Since the present invention is configured as described above, for example, when burying a large diameter pipe underground, the pipe body A is laid in a trench dug in the ground, and the pipe fitting B is connected from the connecting end of the pipe body A. The pipe body is inserted through the pipe body and then connected to the next part.
A' is laid in the groove, its cut end face a' is brought into butt contact with the end face a of the previously laid pipe body A, and an insulating vinyl tape t, for example, is wrapped over the abutting part to make a temporary connection. After doing this, move the pipe fitting so that the connecting part T is located at the center of the pipe fitting B, and place the mortar inlet 3 of the pipe fitting B in an upward position, and pour cement from this mortar inlet 3. Inject mortar and fill the space between pipe bodies A, A' and pipe joint B with mortar, and then immediately or after a required period of time, pour mortar into the dug groove, that is, on the pipe body. The soil excavated during the construction process is backfilled, and the pipe body is buried underground.

<Examples> Examples of the present invention will be described below based on the drawings.

Figures 1 to 5 show an embodiment of the pipe joint according to the present invention and a method of connecting two pipe bodies using the pipe joint, and the pipe joint is made of metal or synthetic resin. As shown in Fig. 1, its structure is a series of cylinders, with a large diameter part 1 at the axial middle part and small diameter parts 2 at both sides, and small diameter parts on both sides. The inner diameter d of 2 and 2 is 2 to 5 smaller than the outer diameter d ₁ of the peak part 11 of the connecting tubes A and A'.
It is formed with a large diameter of mm. As shown in FIG. 3, the intermediate large diameter portion 1 has an axial width of L.
Let the inner diameter be D, the pitch in the uneven waveform of the pipe bodies A and A' to be joined be P, and the outer diameter of the valley portion 12 be
When d ₂ , 2P≦L≦10P, d ₁ + (d ₁ - d ₂ )/2 ≦ D≦ d ₁ + 5 (d ₁ - _{d 2} ) as a large diameter shape within the range that both satisfy the following two equations: be. Further, a mortar inlet 3 is formed through the peripheral wall of the intermediate large diameter portion 1 .

More specifically, for example, pipe body A to be connected,
To explain a fitting for a pipe with a nominal diameter of 200 mm, A' is a corrugated pipe with an outer diameter d ₁ of the peak part 11 of pipe body A and A' of 256 mm, an outer diameter of the trough part 12 of 206 mm, and a pitch P of 50 mm. For the pipe joint B used for connection, the inner diameter d of the small diameter section 2 is d ₁ + 4 mm, i.e. 256 mm + 4 mm = 260 mm, the axial width L of the large diameter section 1 is 2P + 30 mm, i.e. 50 mm x 2 + 30 = 130 mm, and the inner diameter D of the same is d ₁ + (d ₁ - d ₂ ) That is, it is formed to 256 mm + 50 mm = 306 mm. Also, the diameter of the mortar inlet 3 is approximately
It should be about 100mm.

Next, we will explain how to connect the pipe bodies A and A' with the annular uneven corrugations with a nominal diameter of 200 mm using the pipe joint B constructed as described above. First, the two pipe bodies to be connected as shown in Fig. Pipe fitting B is externally inserted onto one of the pipe bodies A and A', and then the third
As shown in the figure, both pipe bodies A,
The cut end surfaces a and a' of A' are brought into contact with each other, and an insulating vinyl tape T is wrapped over the contact portion to preliminarily connect T between the end surfaces a and a'. As shown in Fig. 4, the pipe fitting B that has been fitted onto the pipe body A is moved toward the other pipe body A', and the preliminary connection part T is located approximately at the center of the pipe joint B in the axial direction. The pipe body A, which is connected to the inner circumferential surface of the intermediate large diameter portion 1 of the pipe joint B, In the space s between A' and the outer peripheral surface, as shown in FIG.
Mortar M is introduced from the mortar inlet 3, the space s is filled with the mortar M, and the space s is left as it is for a required period of time to harden the introduced mortar M, thereby completing the connection of the pipe bodies A and A'.

Needless to say, when the pipe bodies A and A' to be connected are buried underground, the pipes are connected in a trench formed by digging the ground, and if it is urgent, the pipes are connected into the space s. Although it is possible to cover the joint B with soil immediately after charging the mortar M, normally, the pipe bodies A and A' are covered with soil and the joint B is also covered with soil after the mortar M has hardened.

As shown in FIG. 6, the mortar inlet 3 formed in the pipe joint B is not limited to a round hole, but may also be a long hole. If it is a long hole, mortar can be poured into the space s. Injection can be performed more smoothly and easily.

FIG. 7 is a diagram corresponding to FIG. 2, showing a case where the spiral corrugated pipes A and A' are connected using the pipe joint B shown in FIG. 1. In this way, the pipe joint B shown in FIG. 1 can also be used as a joint for the spiral corrugated pipes A and A'.

However, such a spiral corrugated pipe A,
As shown in Fig. 8, a pipe fitting B having a structure more suitable for the connection A' is a spiral structure of the pipe bodies A and A' connecting the small diameter portions 2, 2 on both sides in the longitudinal direction of the pipe fitting B. Waveform peaks 11 and troughs 12
It may be formed into a spiral wave shape having peaks 11B and troughs 12B that fit together.

The method of connecting the spirally corrugated pipe bodies A and A' using the pipe fitting B as described above is shown in FIGS. 9 to 12, and the method is shown in FIGS. 2 to 5 above. Compared to the connection method explained in
When the pipe joint B is inserted into one of the pipe bodies A as shown in Figs. 9 and 10, and after the preliminary connection work of the pipe ends a and a' with the tape-shaped material t shown in Fig. 11. As shown in FIG.
When moving pipe fitting B upward, pipe fitting B is rotated spirally with respect to pipe bodies A and A', and is inserted externally or transferred. The pipe connections may be made in exactly the same manner as shown in FIG.

Although the main embodiments have been described above, the tape-shaped material t used for the preliminary connection of the tube bodies A and A' according to the present invention may include the above-mentioned insulating vinyl tape,
Paper, cloth, non-woven fabric, etc. may be used, and it is not limited to tape materials such as gummed tape that are coated with adhesive in advance. The tape material may be attached by applying an adhesive to the tape material.

In addition, the reason why the intermediate part 1 in the pipe fitting B is made into a large diameter part and its inner diameter D is set to d ₁ + (d ₁ - _{d 2} )/2≦D is because the inner surface of the pipe fitting B in the space s is a pipe. If the gap between bodies A and A′ and the mountain portion 11 is narrow,
This is because it becomes difficult to fully charge the mortar M into the space s, and cracks are likely to occur in the hardened mortar M in that part, and D≦d ₁ +5 (d ₁ - d ₂ ).
The reason for this is that even in the case of a concave-convex corrugated tube with a relatively small height difference between the peaks 11 and troughs 12, it is possible to form a sufficient continuous space s and to avoid unnecessary This is to avoid creating a large space that would unnecessarily increase the amount of mortar M to be added. Furthermore, the axial width L of the intermediate large diameter portion 1 is set to 2P≦L because the trough portions 12 of the left and right tubes A, A′ connected within the intermediate large diameter portion 1 are surely present, and the connection This is to reliably prevent the tube from coming off later due to external force, and L
≦10P is used for large-diameter pipes where the outer diameter of the pipe bodies A and A' is 3000 mm or 5000 mm, and for corrugated pipes with a relatively small pitch P such as 50 mm. This is to ensure that the mortar M can be connected reliably, and to avoid wasting the mortar M by making it wider than necessary.

In addition, although the mortar inlet 3 is shown as one in the embodiment, it may be formed at two or three locations separated in the axial direction, circumferential direction, diagonal direction, etc., and the mortar M is poured from multiple locations. Alternatively, the shape may be arbitrarily determined.

Furthermore, the waveform shape of the concavo-convex corrugated tube to be connected is not limited to the U-shaped cross-sectional waveform shown in the embodiment or the above-mentioned arcuate waveform, but also triangular waveform, U-shaped waveform,
Needless to say, any uneven waveform such as a trapezoidal waveform may be used.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structure and method of these embodiments.
The present invention can be modified and implemented as appropriate within the scope of having the constituent features defined in the present invention, achieving the objectives defined in the present invention, and having the following effects.

<Effects of the Invention> As is already clear from the above description, the present invention has the following effects:
A pipe joint used to connect pipe bodies that can connect large diameter pipe bodies extremely reliably while having the structure itself as simple as possible,
By forming small diameter parts on both sides in the axial direction, and making the inner diameter of the small diameter parts slightly larger than the outer diameter of the connecting peak of the pipe body, insertion into the pipe body and transition operation are facilitated. The intermediate large diameter portion can be held in a substantially concentric position with respect to the pipe body, and the mortar to be charged can be made to have a substantially uniform thickness over the entire circumference of the pipe body. In addition, since the outer circumference of the hardened mortar is held in shape by this pipe joint, it will not be damaged by external force. It will be protected for many years with very few cracks. In addition, the pipes can be easily connected, and the abutting end surfaces of the pipes are pre-connected using tape, so there is no mortar inside the pipes. Mortar can be poured into the space without the risk of inflow, and the mortar protects the entire circumference of the tape material after the mortar is introduced. It has a triple protection structure of wood, mortar, and pipe joints, and can be expected to have the remarkable effect of being able to maintain a state without water leakage for many years.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, and FIG. 1 is a perspective view of a pipe joint, and FIG.
The figure is a plan view of the pipe fitting inserted into the pipe body.
Figures 5 to 5 are central vertical sectional side views showing subsequent pipe connection methods over time, Figure 6 is a perspective view showing another embodiment of the pipe joint, and Figure 7 is another example of the pipe connection method. FIG. 2 is a diagram corresponding to an embodiment, FIGS. 8 to 12 are diagrams showing still other embodiments, FIG. 8 is a perspective view of a pipe joint, FIG. 9 is a diagram corresponding to FIG. 1st
Figure 0 is a central vertical sectional side view of the same part, Figure 11 and Figure 1.
Figure 2 is a central vertical sectional side view. In the figure, 1 is a large diameter part, 2 is a small diameter part, 3 is a mortar inlet, 11 is a peak, 12 is a trough, A and A' are pipe bodies,
a, a' are cut end surfaces, B is a pipe joint, M is mortar,
s is the space part, T is the preliminary connection part, t is the tape-like material, D is the inner diameter of the large diameter part, d is the inner diameter of the small diameter part,
d ₁ is the outer diameter of the peak, d ₂ is the outer diameter of the trough, L is the width in the axial direction, and P is the pitch.

Claims (1)

[Scope of Claims] 1. A pipe joint used to connect large pipe bodies A and A' whose outer peripheral surfaces are formed in a concave and convex wave shape, wherein the axially middle part is the large diameter part 1 and the both sides are the large diameter part 1. are formed in the small diameter parts 2, 2, and the inner diameter d of the small diameter parts 2, 2 on both sides is slightly larger than the outer diameter d ₁ of the peak part 11 of the connecting pipes A, A'. The intermediate large diameter portion 1 has an axial width of L, an inner diameter of D, a pitch of the concave and convex waveforms of the pipe bodies A and A' to be joined, P and an outer diameter of the valley portion 12 of _d2 . When 2P≦L≦10P, d ₁ + (d ₁ - d ₂ )/2 ≦ D ≦ d ₁ + 5 (d ₁ - d ₂ ), both of which satisfy the following two equations:
Furthermore, the pipe joint for a large corrugated pipe has a structure in which one or more mortar inlets 3 are formed through the peripheral wall of the intermediate large diameter part 1. 2. A method for watertightly connecting large-diameter tube bodies whose outer peripheral surfaces are formed in an uneven wave shape using the pipe joint B according to claim 1, the method comprising: connecting two tube bodies to which the pipe joint B is connected; After inserting the outer fitting onto one of the tubes A and A', the cut end surfaces a and a' of the two tubes A and A' to be connected are brought into contact with each other, and the top of the abutting part is Preliminary connection T is made between the same end surfaces a and a' by winding and adhering a tape-like material T to the tube body A, and then the pipe joint B that has been fitted onto one tube body A is attached to the other tube body A'. Shift it toward the side so that the preliminary connection part T is located approximately at the center in the axial direction of the pipe joint B, and position it so that the mortar inlet 3 of the pipe joint B is located on the upper side, After doing this, mortar M is poured into the space s between the inner circumferential surface of the intermediate large diameter section 1 of the pipe joint B and the outer circumferential surfaces of the connected pipe bodies A and A' through the mortar inlet 3. Then, fill the space s with mortar M, leave it as it is for a required period of time, and fill the mortar M.
Watertight connection method for large corrugated pipes.