JPH0143878B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a joint portion where two pipes for underground burial are connected in a flexible and expandable manner. This invention relates to a pipe detachment prevention device for a pipe joint, which is comprised of two types of tube detachment prevention fittings divided into a plurality of pieces and tightened together.

[Conventional technology]

FIG. 11 and FIG. 12 show an example of a conventional pipe detachment prevention device for a pipe joint in a water pipe. This conventional device attaches a rubber ring 12 to the outer peripheral surface of the water pipe 1 on the outlet side, and connects the end of the pipe to the water pipe 2.
The pipes 1 and 2 are fitted into the socket to maintain watertightness between the pipes 1 and 2. In this case, the outer diameter of the tube 1 is set smaller than the inner diameter of the tube 2, and in the fitted state, there is a predetermined gap 13 between the outer diameter of the tube 1 and the inner diameter of the socket part of the tube 2. is formed. This gap 13
is designed to absorb the displacement and allow the joint portion of pipes 1 and 2 to be displaced in the radial direction and deflect within a predetermined range when the soil moves due to automobile driving, earthquakes, etc. This is to prevent damage to each tube end of the joint.

Therefore, in addition to having flexibility, such a pipe joint part must also prevent the water pipe 1 from separating from the water pipe 2, and a prevention device 3 for this purpose is required. The conventional tube detachment prevention device 3 consists of a metal fitting 4 and a metal fitting 5, and the metal fittings 4 and 5 are each formed by being divided into two parts. To attach the fitting 4 to the water pipe 1, insert the fastening bolt 7 from one side of the flanges 6, 6 of the half-split fittings 4a, 4b into the round bolt holes formed in the flanges 6, 6, and then insert the fastening bolt 7 from the other side. This is done by screwing and tightening the nut 8 onto the bolt 7 on the flange 6 side. Thereby, the metal fitting 4 is firmly fixed to the water pipe 1. In the case of the water pipe 2 and the fitting 5, the fitting 5 is fastened to the water pipe 2 in the same manner as described above.

By the way, in order to prevent water pipe 1 and water pipe 2 from separating, it is necessary to suppress axial movement between both pipes 1 and 2 that exceeds the allowable extension range. Therefore, in the case of the tube detachment prevention device 3, the metal fitting 5
One end of the connecting rod 9 is rotatably attached to locking plates 14, 14 formed at positions deviated by 90 degrees from the flanges 6, 6 in the circumferential direction. And the connecting rod 9
The other end side is fitted into the locking plates 10, 10 formed at positions deviated by 90 degrees in the circumferential direction from the flanges 6, 6 of the metal fitting 4, and the tip locking portion 9a is fitted into the locking plates 10, 10.
By engaging this at the end surface opposite to the metal fitting 5 of 0, the metal fittings 4 and 5 are prevented from coming apart. Note that 11 is a screw member for preventing the connecting rod 9 fitted into the locking plates 10, 10 from detaching due to rotation.

[Problem that the invention seeks to solve]

As is clear from the above configuration, the connecting rods 9, 9 for preventing the pipes from detaching are either attached to the metal fittings 4, 5 in advance at a factory or the like and prevented by rotating and detaching using the bolts 11, or they are installed at the site. You need to install it in the same way. The actual work involves tightening the flanges 6, 6, bolts 7, and nuts 8 at the lower and upper (first
In FIG. 1, only the upper metal fitting tightening part is shown), and the locking plates 14, 14 and 10, 10 are located in the horizontal horizontal part. For this reason, there was a drawback that it was difficult to fasten the bolt 7 and nut 8 located below. There are usually a huge number of such joints in a construction section, which impairs the overall workability and takes a long time to connect, causing a long construction period. Moreover, the structure of such a metal fitting fastening part is similar to that of water pipes 1 and 2.
There is a drawback that the fastening state of the bolts 7 and nuts 8 located at the lower position cannot be visually confirmed unless the holes are dug to the bottom, and the workability is also poor in this case. Furthermore, since it was necessary to fasten the bolts 7 and nuts 8 at the lower position and to confirm the fastened state, it was necessary to secure a sufficient working space, and it was necessary to excavate a wide area around the joint portion.

Further, the metal fittings 4 and 5 are usually prepared with the bolt 7, nut 8, and bolt 11 fastened together. Therefore, when fastening to the water pipes 1 and 2, the bolt 7 and nut 8 must be unscrewed and removed from the fittings 4 and 5, and the fittings 4 and 5 must be separated into two halves before the tightening work is performed. However, there was a drawback that it was time-consuming as it required removing and tightening many bolts.

Furthermore, when changing the amount of expansion and contraction, the length of the connecting rods 9, 9 must be changed, but in the structure of the metal fitting 5, the connecting rods 9, 9 are connected to the half-split metal fittings 5.
Since it is integrally constructed with the connecting rods 9 and 5b, it is not possible to change only the connecting rods 9 and 9, and it is necessary to replace the entire metal fitting 5 with another one.

The present invention has been made to improve and eliminate the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide a tube detachment prevention device for a pipe joint that is excellent in workability.

[Means for solving problems]

Means of the present invention for solving the above problems are as follows:
Two types of tube detachment prevention fittings are divided into a plurality of pieces and are tightened on the outer circumferential surface of the tubes at the joint part where the tubes are connected in a flexible and expandable manner. The pipe detachment prevention fitting has a protruding piece that protrudes toward the flange of the adjacent other split piece at the tip of the flange formed at both ends of each split piece, and also has a protruding piece that protrudes toward the flange of the other adjacent split piece, and one side of each opposing flange. niT
A long hole into which the head of the T-bolt can be inserted and a seating part for the head are formed on the other side of the bolt insertion hole, and one pipe and the other pipe are formed between the opposing flanges and the protruding pieces. An insertion space for a connecting rod is formed to connect the two. In addition, the other side tube detachment prevention fitting has a mating surface that abuts the flange portion of the other neighboring split piece fitting on the flange portion formed at both ends of each split piece fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece metal fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece fitting, and has a mating surface that abuts the flange portion of the other neighboring split piece metal fitting. A through hole is bored through the connecting rod.

[Effect]

As shown in the embodiments of FIGS. 1 to 10, in the metal fitting 16 on one side, the T-bolt 57 has its shaft portion connected to the insertion hole 50 of the flange 18 on one side and the elongated hole 51 of the flange 18 on the other side. It is penetrated into. The head 57a is seated in the seating portion 21 of the flange 18 on the other side so as to intersect with the elongated hole 51, and the respective divided metal pieces 16a and 16b are fastened together. The connecting rod 22 is connected to the flange portion 18 of the metal fitting 16,
18 and the protruding pieces 19, 19, and is able to move to some extent in the radial and axial directions. In addition, in the case of the metal fitting 17 on the other side, the mating surfaces 34 and 35 formed on the flanges 32 and 33 of the respective split piece metal fittings 17a and 17b abut each other, and the screws of the connecting rod 22 are inserted into the through holes 36 and 37. The portion 38 side is inserted. And Natsuto 3
9 has been concluded.

The fitting 16 can be attached and detached by loosening the nut 8, rotating the head 57a of the T-bolt 57 by 90 degrees to align with the direction of the elongated hole 51 of the flange 18, and then removing it.
Further, the metal fitting 17 can be attached and removed by loosening the nut 39 and pulling out the split piece metal fitting 17b. Therefore, metal fitting 1
6 and 17 can be attached and detached using T bolt 57 and connecting rod 22.
There is no need to remove the nuts 8 and 39, and the work efficiency is very high.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a more detailed description will be given with reference to the drawings based on an embodiment of a split metal fitting in which the structure of the present invention is applied to a water pipe. Note that the same reference numerals as in the conventional case represent the same members.

〔Example〕

FIG. 1 is an overall perspective view showing a state in which the pipe detachment prevention device 15 is attached to water pipes 1 and 2, and FIG. 2 is an exploded perspective view of the same. Note that, as in the conventional case, the water pipe 1 and the water pipe 2 are connected in a flexible and expandable manner. The tube detachment prevention device 15 is
It consists of a metal fitting 16 and a metal fitting 17, and each of the metal fittings 16 and 17 is formed by being divided into two pieces. Furthermore, as shown in FIG. 3, the contact surface of the metal fitting 16 with the water pipe 1 is provided with a non-slip surface 30 by using the cast surface as it is or by roughening the surface by machining or the like. In addition, the metal fitting 17 is attached to the large diameter portion 3 of the water pipe 2.
1 restricts movement toward the left side in FIG. 3, so it is not necessary to provide a non-slip surface, but it is of course possible to provide a non-slip surface.

Flange portions 18 are formed at both ends of each of the half-split metal fittings 16a, 16b. A protrusion piece 19 is formed at the tip of each flange portion 18 so as to protrude toward the other opposing flange portion 18 side.
The protruding height of this protruding piece 19 is such that the connecting rod 22 can move to a certain extent in the vertical direction in FIGS. 1 and 2 even when the opposing protruding pieces 19 are in contact with each other in the fastened state described later. It's becoming like that.
This is to allow the water pipes 1 and 2 to bend in the radial direction. One side half-split metal fitting 1
An insertion hole 50 for a T-bolt 57 is bored in the flange portion 18 of 6a. Further, the flange portion 18 of the half-split metal fitting 16b on the other side has a long hole 5 along the radial direction through which the T-bolt head 57a can be freely inserted.
1 and a seating portion 21 for the T-bolt head 57a are formed. The seating portion 21 is formed along the tube axis direction on the outer surface side of the flange portion 18, and has an R-surface concave portion 21a (see FIGS. 4 to 7).

Further, flanges 32, 3 in a direction perpendicular to the tube axis direction are provided at both ends of each half-shaped metal fitting 17a, 17b.
3 is formed. Both flanges 32 and 33 are
As shown in FIG. 9, mating surfaces 34 and 35 are formed by cutting each half in half. Therefore, the battle surface 3
When 4 and 35 are in contact with each other, the metal fitting 17b
The upper end surfaces 41, 41 of the flanges abut against the shoulders 40, 40 of the metal fitting 17a, and the lower end surfaces 42, 41 of the metal fitting 17a,
42 is placed against the shoulders 43, 43 of the metal fitting 17b. In addition, the lower end surface 45 of the metal fitting 17b,
45 is placed on the cut-out pieces 44, 44 formed on the abutting surfaces 34, 34 of the metal fitting 17a. Therefore, when the mating surfaces 34 and 35 abut against each other, the metal fittings 17a and 17b do not deviate from each other in the vertical direction in the figure. Flange 3 of metal fitting 17a
A through hole 36 for inserting the threaded portions 38 of the connecting rods 22, 22 is provided approximately at the center of each of the connecting rods 22, 22.
36 are drilled. Further, U-shaped through holes 37, 37 are bored in the flanges 33, 33 of the metal fitting 17b. 46, 46 are the meeting surfaces 34,
This is a cutout piece formed on the upper side of 34. These cutout pieces 46, 46 are connected to the U-shaped through hole 37 of the metal fitting 17b.
The connecting rods 22, 22 function as part of the wall surface of the insertion hole. The cutout pieces 46, 46 are not necessarily necessary.

Note that the connecting rods 22, 22 in this embodiment are as follows:
A locking part 23 is formed on one end of the prismatic body, and a threaded part 38 is formed on the other end.
6 and 17 are independent and separate.

Next, the tube detachment prevention device 1 configured as described above will be described.
The installation procedure in step 5 will be explained below.

In addition, in the preparation state, this tube detachment prevention device 15 has a half-split metal fitting 16 as shown in FIG.
a, 17a are attached to the connecting rods 22, 22,
The half-split metal fittings 16b and 17b are connecting rods 22 and 22.
It is tied up while being placed on the board. Therefore, when stored, the volume occupied by these can be approximately halved.

For installation, from the prepared state, tighten the nuts 8 of the T-bolt 57 and the nuts 39, 3 of the connecting rods 22, 22.
Leave 9 loose. And half-split metal fittings 16b,
17b is fitted onto the water pipes 1 and 2 from below. Next, with the connecting rods 22 and 22 still attached, connect the half-split fittings 16a and 17a to the water pipe 1,
2 from above and externally fitted thereon, and the half-split metal fittings 16a and 16b and 17a and 17b are held together. After that, in this engaged state, the loosened T-bolt head 57a is inserted into the elongated hole 51 of the half-split metal fitting 16b and engaged with the R-surface recess 21a of the seating portion 21. Then, by screwing and tightening the nut 8 and the T-bolt 57, the metal fitting 16 is connected to the water pipe 1.
It is possible to attach it to. In addition, in the case of the metal fitting 17, if the mating surfaces 34, 35 of the flanges 32, 33 are brought into contact with each other from the above-mentioned tied state, and the nuts 39, 39 are fastened, the water pipe 2
It is possible to attach it to.

In such installation work of the pipe detachment prevention device 15, the fastening part of the T-bolt 57 and the mounting part of the connecting rod 22 are difficult because each flange part 18 is located on the horizontal side of the water pipes 1 and 2. There is no need to excavate the soil below the water pipes 1 and 2, and the work can be done simply, easily, and quickly. In addition, the T-bolt 57 and the nut 8, and the connecting rod 22 and the nut 39 do not need to be completely unthreaded and separated; they can just be loosened, which saves the trouble of searching for these members individually.
Further, the work can be simplified. For this reason, when the nut 8 is screwed onto the T-bolt 57 and the half-split fitting 17a is attached to the connecting rod 22 and the bolt 39 is screwed, the tips of the T-bolt 57 and the connecting rod 22 are By upsetting the nuts 8 and 39, it is possible to prevent an operator from removing the nuts 8 and 39 carelessly.

In the state after installation, the head 5 of the T-bolt 57
7a, as shown in FIGS. 4 to 7, is a concave portion 2 on the rounded surface of the seating portion 21 formed in the half-split metal fitting 16b.
1a prevents its rotation and at the same time determines the position of the T-bolt 7, making it possible to reliably form an insertion space for the connecting rod 22. In addition, the connecting rod 22 is
As shown in FIGS. 3 to 7, it is possible to move to some extent in the radial direction and the axial direction of the T-bolt 57 in the space 24 formed between the opposing flanges 18, 18 and the protruding pieces 19, 19. A gap is formed between each member. This gap is provided to prevent the connecting rod 22 from interfering with the bending of the water pipe 1 and the water pipe 2 in the radial direction at the joint portion. Thereby, the water pipes 1 and 2 can freely bend in the radial direction within the range of the gap 13 shown in FIG. The front space 24 can be filled with an elastic material such as rubber, and in FIG. ) 47 examples are shown. 48 is a through hole formed in the connecting member 47 through which the T bolt 57 is inserted.
The shape of this connecting member 47 does not need to be particularly limited. For example, it is also possible to form as shown in FIG. In the figure, 49 is a through hole through which the connecting rod 22 is inserted. When using the connecting member 47, at least the half-split metal fitting 1
6a, connecting rods 22, 22, half-split metal fittings 7a, T
It is possible to integrate the bolt 57. Furthermore, the locking portion 23 of the connecting rod 22 is spaced apart by a predetermined distance from the end surface 18a of each flange portion 18, and can be moved in the axial direction by the distance. In other words,
It is possible to guarantee the expansion/contraction/flexibility of the water pipes 1 and 2. If it is desired to change the allowable amount of expansion and contraction, the screwing state of the nuts 39, 39 may be adjusted. In addition, in FIGS. 3 and 4, 58 is an elastic material attached to the tip side of the connecting rod 22,
It functions as a member that ensures the expansion/contraction/flexibility of the water pipes 1 and 2. In addition, the elastic material 58 expands and contracts.
The flexible operation also has the function of preventing an unnecessary gap from being formed between the metal fittings 16 and 17 in a normal state in which no expansion, contraction, or flexibility occurs; In this case, it also serves to prevent the connection between the metal fittings 16 and 17 from loosening.

Further, there is no need to form slits or the like in each of the flange portions 18, 32, 33 as a means for ensuring movement of the connecting rod 22 in the radial and axial directions. Therefore, each flange portion 18, 32, 33 is not divided in the radial direction or the like, and can be configured as a single plate, and can exhibit sufficient strength.

The metal fittings 16 and 17 can be removed in the reverse order as described above. Even in this case, T bolt 5
7, the nut 8, the connecting rod 22, and the nut 39,
There is no need for complete separation.

By the way, the present invention is not limited to the above-described embodiments, and can be modified as appropriate. For example, the connecting rod 22 does not have to be a prismatic body but may be a round rod shape. Even in this case, there is no need to remove the nut of the connecting rod 22 during construction work. Moreover, the metal fittings 16 and 17 can also be applied to pipe materials or rod materials other than the water pipe 1 and the water pipe 2. Furthermore, it goes without saying that the metal fittings 16 and 17 may be divided into a plurality of parts, such as three or four parts other than two parts.

〔Effect of the invention〕

As explained above, in the present invention, the flange part, which is the fastening part between the T-bolt and the nut, and the flange part, which is the fastening part between the connecting rod and the nut, are located on the horizontal side of the pipe, and the T-bolt and the connecting part are located on the horizontal side of the pipe. The structure is such that the pipe-to-pipe joints do not separate in the process of simply tightening the nut on the rod, making the fastening work extremely easy. Further, there is no need to excavate a wide area under and around the pipe joint. Moreover, the absolute number of bolts and nuts is smaller than in the conventional case, and T
Since there is no need to separate the bolt and nut and the connecting rod and nut, it is possible to significantly simplify the work. Furthermore, it is possible to prepare the whole as a unit, and there is no need to find bolts and nuts individually. In addition, the amount of expansion and contraction can be changed simply by adjusting the threaded state of the connecting rod and the nut, which is convenient. Furthermore, the flange portion is not provided with slits or the like to ensure movement of the connecting rod in the radial and axial directions, but is made of a single plate, and can ensure sufficient strength.

[Brief explanation of drawings]

Figures 1 to 10 relate to the present invention; Figure 1 is an overall perspective view of a pipe detachment prevention device when applied to a water pipe, Figure 2 is an exploded perspective view thereof, and Figure 3 is a flange. FIG. 4 is a plan view of the flange portion, and FIG. 5 is a half-sectional view taken in a direction perpendicular to the tube axis.
Fig. 6 is a bottom view showing a part of the flange part, Fig. 7 is a perspective view showing the flange part of the metal fitting, Fig. 8 is a perspective view showing another embodiment of the connecting member, and Fig. 9 is the other example. FIG. 10 is an exploded perspective view showing the metal fittings, FIG. 10 is a perspective view showing the pipe detachment prevention device in a ready state, FIG. 11 is an overall perspective view when the conventional pipe detachment prevention device is applied to a water pipe, and FIG. 12 is the same. It is an exploded perspective view. 1, 2...Pipe, 16, 17...Metal fitting, 16a,
16b, 17a, 17b...Half-split metal fittings, 18
... Flange portion, 19 ... Projection piece, 50 ... Insertion hole, 51 ... Long hole, 21 ... Seating portion, 21a ...
R surface recess, 24... Insertion space, 32, 33... Flange portion, 34, 35... Coupling surface, 36, 37
...through hole.

Claims (1)

[Claims] 1. Two types of pipe detachment prevention fittings divided into a plurality of pieces that are tightened on the outer circumferential surface of the pipes at the joint part where the pipes are connected in a flexible and expandable manner, and one side The tube detachment prevention fitting has a protruding piece that protrudes toward the flange side of the other adjacent split piece at the tip of the flange formed at both ends of each split piece, and one side of each opposing flange. A T-bolt insertion hole is formed on one side, a long hole into which the head of the T-bolt can be inserted and a seating part for the head are formed on the other side, and one tube and the other are formed between the opposing flanges and the protruding pieces. An insertion space for a connecting rod is formed to connect the two pipes, and the other side pipe detachment prevention fitting is connected to the flange portion of the other split piece fitting adjacent to the flange portion formed at both ends of each split piece fitting. 1. A tube detachment prevention device for a pipe joint, characterized in that the flange portion has a mating surface that abuts against the flange portion, and a through hole for inserting the connecting rod is bored approximately in the center of each flange portion.