JPS62276196A - Joint device of small-bore hume pipe for method of propulsion construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention has an inner diameter of 700++
The present invention relates to a coupling device for a small-diameter hume pipe of less than m.

[Problems to be solved by the invention] In recent years, sewerage construction work in urban environment development has been
In the case of small-diameter Huyum tubes with 0 fins or less, propulsion methods such as horizontal auger one-way systems are increasing significantly. In these propulsion methods, as shown in Fig. 4, the fume pipes 1 to be buried are connected to each other with a joint 2, and a propulsion jack 4 installed in a launch shaft 6 is used to simultaneously propel a plurality of fume pipes connected in series. Bury it. In addition, in Figure 4, 5 is the reaching hole,
6 is a leading pipe.

The conventional hume pipe 1 used in this propulsion method has a notch 8 on its end surface, which has a circular cross section concentric with the outer circumferential cross section of the hume pipe as shown in FIG. be. And two Huyum tubes 1 with their end faces abutted,
1, the joint 2 is formed by fitting rubber rings 9, 9 into the grooves 7, 7, and covering the two notches 8.8 with an annular steel collar 10 having a T-shaped cross section. However, when this steel collar 10 joint is buried using the propulsion method, the collar may curl up, cause poor adhesion with the rubber ring, or may cause problems such as the rubber ring rolling up when being pushed in, preventing water leakage. It was easy to wake up. When the direction of propulsion is controlled during propulsion, strain concentrates on the joint, and in the case of a steel collar with poor flexibility, this cannot be alleviated, making it easy for the joint to break or the hump tube to be damaged.

In addition, since the Huyum canal 1 has a small diameter, the Huyum canal i,
The tip of the flange of the steel collar 10 sandwiched between +Fs'5 cannot be filled from inside the pipe, and is easily corroded by the liquid flowing inside the pipe, and the anti-rust paint on the outer circumferential surface of the steel collar 10 also peels off due to friction during propulsion. water leakage due to corrosion could not be avoided.

In order to improve these drawbacks of the steel collar, as shown in FIGS. 6(a) and 6(b), instead of the steel collar, a heat-shrinkable plastic 11 on the outer periphery and an adhesive layer 12 on the inner surface were used.
There is a proposal to use a plastic collar 13 consisting of.

This plastic collar 13 is placed over the notches 8, 8 at the ends of the butted hume tube 1.1 (Fig. a),
It is heated with an electric heating belt or the like to contract, and the heat shrinkage force brings it into close contact with the surface of the notch 8 to form a joint.

The plastic collar of this joint is made of cross-linked polyethylene-based heat-shrinkable resin or butyl rubber-based adhesive, so it is resistant to corrosion and deterioration and has extremely high water-stopping properties. In addition, the flexibility can reduce the strain that occurs during propulsion and burying, thereby reducing damage to the joint or the tube. However, in the conventional fume tube, the notch 8 at the end has a groove 7 into which a rubber ring is fitted, and due to the cross-sectional loss caused by this, the yield strength in the axial direction is low, and the groove 7 is easily damaged. Furthermore, the plastic collar 13 did not adhere to the grooves 7, and its surface tended to dent due to shrinkage force, which was likely to cause the collar to curl up.

This invention was made in view of the above circumstances. The purpose is to propose a coupling device for small-diameter hume pipes for the propulsion method that is less likely to cause damage to the joint or hume pipe when buried using the propulsion method, is less prone to corrosion or deterioration, and can maintain high water-stopping properties over a long period of time. .

[Means for solving problems]

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows a cross section of the end portions of hume pipes 1, 1 connected by a coupling device to be buried using the propulsion method. On the end surfaces of the two abutted hume tubes 1, 1, there is a notch 1 consisting of a continuous surface with a circular cross section concentric with the outer peripheral cross section of the hume tube.
4 is provided. A cylindrical plastic collar 13 with an adhesive layer 12 on the inner surface and a heat-shrinkable plastic 11 on the outer periphery is placed across the ends of these two hume tubes 1, 1 (Fig. a), and heated. The heat shrinkage force brings the material into close contact with the surface of the notch 14 (Figure b). The plastic collar 16 has two abutted notches 14. +4, and its outer surface is substantially flush with the outer circumferential surface of the hume tube.

Plastic collar 16 used in the coupling device of this example
The adhesive layer 12 with a thickness of 0.6 Minutes was laminated on the inner surface of a heat-shrinkable plastic 11 with a thickness of 1.1 mm, and a release paper was attached to the inner surface. When in use, peel off the release paper, cover the end of the fume tube, and heat with an electric heating belt or the like to shrink and adhere. Generally, the thickness after shrinkage is about twice as large. Therefore, the height of the notch 14 with respect to the outer circumferential surface of the hume tube was set to be approximately equal to the thickness of the plastic collar after shrinkage (1.1 + 0.6) x 2:3.4.

In addition, as shown in Fig. 2, this plastic collar has a steel strip 15 inside the heat-shrinkable plastic 11 constituting the outer periphery.
It may be reinforced by embedding a reinforcing material such as. In addition, steel rods, steel mesh materials, high-tensile wire rods for tire cords, etc. can also be used as reinforcing materials. These reinforcing materials are preferably buried in parallel along the longitudinal direction of the collar so as not to restrict heat shrinkage of the plastic collar and to counter strain stress in the longitudinal direction of the collar.

Figure 3 also shows the Huyume pipe (diameter 3aa) buried using the propulsion method.
Fig. 3 shows an example of a joint device in which a 57 mrL (thickness: 57 mrL) is connected. A notch 14 (level difference with the outer circumferential surface q mm 1 length 105 mm) is provided on the end surfaces of the two butted hume tubes 1, 1, which are made of a continuous surface with a circular cross section concentric with the outer circumferential cross section of the hume tube. There is. A cylindrical plastic collar 13 with an adhesive layer 12 on the inner surface and a heat-shrinkable plastic 11 on the outer periphery is placed over the notches 14 and 14 of the two hume tubes 1, 1, and is heat-shrinked. It is brought into close contact with the surface of the notch 14 by heat shrinkage force.

In this embodiment, a steel plate ring 16 is fitted to the rear end of the outer peripheral surface of the hume pipe 1 in the propulsion direction (left direction in FIG. 3(a)), and its surface is flush with the outer peripheral surface of the hume pipe. none,
Its side edges overhang the notch 14. The ends in the propulsion direction of the plastic collar 13 placed between the ends are located below the steel plate ring 16 extending over the notch.

Furthermore, four sets of opposing pin holes 17, 17 are bored in the end surfaces of the two butted humid pipes 1, 1, and these two pin holes 17, 17 IC4 vertical connection piers 18
(diameter 9++rm, length 1oo-) is inserted. In addition, butyl rubber sealing material (thickness 5 mm, width 15 mm) is placed between the end faces.
mm) 19 is attached. This sealing material 19 has plastic fluidity, flows under the pressure of the thrust of the propulsion jack, spreads between the end faces, and tightly closes the gap therebetween. −
In addition, in FIG. 3(a), 20 is an anchor.

A cylindrical plastic collar made of cross-linked polyethylene heat-shrinkable resin contracts in the circumferential direction when heated, and usually expands in the length direction. For example, in the embodiment shown in FIG.
The unshrinked plastic collar 161 expands in the length direction by approximately 1 QmN as it contracts in the circumferential direction. Therefore, if the unshrinkable plastic collar -13' is placed with its propulsion direction end along the rear edge of the steel plate ring 16 and is heat-shrinked, its propulsion direction end will be attached to the steel plate link 16 after shrinkage. It can be placed below the .

[For production]

This coupling device has the above-mentioned configuration. The plastic collar is housed in a notch that has a circular cross section concentric with the outer peripheral cross section of the hume tube. Compared to conventional hume tubes, there is no groove for fitting the rubber ring, so There is no reduction in yield strength due to loss, and the level difference in the cutout portion can be as large as the thickness of the plastic collar after shrinkage, so the cross-sectional area of the humid tube becomes larger and the axial yield strength increases. In addition, since the plastic collar is tightly bonded and bonded by heat shrinkage force, it is difficult to turn over or shift its position due to friction during propulsion, and it alleviates strain stress, making it difficult for damage to joints and humid pipes to occur, and preventing corrosion. Deterioration is also difficult to occur.

As in the embodiment shown in Fig. 3, when a steel plate ring is fitted to the rear end of the hume tube in the propulsion direction and the leading edge of the plastic collar is positioned below it, the leading edge of the collar is protected by the steel plate ring. Therefore, it is possible to more reliably prevent the collar from turning up during propulsion.

By inserting a connecting pin across the pin hole drilled in the end face, shearing and misalignment between the hume tubes during propulsion or after burial can be more reliably prevented. In this coupling device, the thickness of the end of the humidifier tube is small and there is no cross-sectional loss due to grooves, so the pin hole part is less likely to be damaged due to the force acting on the connecting pin.
It firmly supports that stress.

When a plastic fluid sealing material is inserted between the end faces of the hume tube,
It flows due to the pressure between the end faces during propulsion and can tightly close the end faces. Conventionally, when moving through underground ground where there is a lot of groundwater, groundwater flows inside the buried pipe, flows out through the gap between the end faces, wets the outer surface, and tends to cause problems during adhesion due to heat shrinkage of the plastic collar. By interposing this sealing material, water does not flow out between the end faces, and poor adhesion due to water wetting can be prevented. Further, this sealing material is located between the hume tubes and exhibits a buffering function, thereby preventing the hume tubes from being damaged due to direct contact during propulsion.

Note that it is preferable to embed a reinforcing material in the plastic collar for reinforcement as shown in FIG. 2, as this will improve the strength of the joint.

The coupling device shown in Fig. 3 covers the ends of the hume tube with a plastic collar, and also fits a steel plate ring on the rear end of the outer circumferential surface of the hume tube in the direction of propulsion. A connecting pin was inserted between the end faces, and a plastic fluid sealing material was interposed between the end faces. However, fitting the steel plate ring, inserting the connecting pin, and interposing the sealing material do not necessarily have to be used in combination. One or more of them may be selected and used as needed.

〔Effect of the invention〕

The present invention is as described above, and when this joint device is buried using the propulsion method, damage to the joint and the humid pipe is less likely to occur, and the propulsion extension can be increased to significantly improve construction efficiency. Furthermore, deterioration due to corrosion is unlikely to occur, and high water-stopping properties are maintained for a long period of time.

[Brief explanation of the drawing]

Figure 1 (al, (bl) is a partial cross-sectional view of the joint device of the example before and after contraction. Figure 2 (al, (1)) is a side and front cross-sectional view of a plastic collar in which reinforcing material is embedded. , Figures 3(a) and (1)) are a sectional view of a coupling device of another embodiment and a front view of the end face of a humid pipe with a sealing material attached, and Figure 4 shows a horizontal earth auger one-type propulsion method. Schematic diagram, Figure 5 is a partial cross-sectional view of a conventional steel collar joint, and Figures 6 (a) and (1)) are partial cross-sectional views of a conventional plastic collar joint connecting humid pipes before and after contraction. be. 1. Huyum tube, 2. Joint, 3. Starting shaft, 4.
Propulsion jack, 5. Reaching hole, 6. Leading pipe, 7. Groove, 8. Notch, 9. Rubber ring, 10. Steel collar, 11. Heat shrinkable plastic, 12. Adhesive layer, 13...Plastic collar, 14...Notch, 15
... Steel strip, 16... Steel plate ring, 17... Pin hole, 1
8. Connecting pin, 19. Plastic fluid sealing material, 20.
- Anchor.

Claims (4)

[Claims] (1) In a coupling device for small-diameter Hume pipes with an inner diameter of less than 700 mm that are buried by the propulsion method, a cylindrical heat-shrinkable pipe with an adhesive layer on the inner surface that spans between the ends of two butted Hume pipes is used. Cover with plastic collar,
The end surface of the fume tube is provided with a notch having a circular cross section concentric with the outer peripheral cross section of the fume tube, and the plastic collar is accommodated in this notch. A coupling device for a small-diameter Hume pipe for a propulsion method, characterized in that its outer surface is substantially flush with the outer peripheral surface of the Hume pipe. (2) In a coupling device for small-diameter Hume pipes with an inner diameter of less than 700 mm buried by the propulsion method, a cylindrical heat-shrinkable tube with an adhesive layer on the inner surface is used, which spans between the ends of two butted Hume pipes. Cover with plastic collar,
The end surface of the fume tube is provided with a notch having a circular cross section concentric with the outer peripheral cross section of the fume tube, and the plastic collar is housed in this notch, and , a propulsion method characterized in that the end of the plastic collar in the propulsion direction is located below the overhanging part of a steel plate ring fitted over a notch on the rear end of the outer peripheral surface of the Hume pipe in the propulsion direction. A coupling device for small-diameter Hume pipes. (3) In a coupling device for small-diameter Hume pipes with an inner diameter of less than 700 mm buried by the propulsion method, a cylindrical heat-shrinkable pipe with an adhesive layer provided on the inner surface spans between the ends of two butted Hume pipes. Cover with plastic collar,
The end surface of the fume tube is provided with a notch having a circular cross section concentric with the outer peripheral cross section of the fume tube, and the plastic collar is housed in this notch, and A coupling device for a small-diameter hume pipe for a propulsion method, characterized in that pin holes are formed opposite to each other in the end faces of the two hume pipes, and a connecting pin is inserted across the two pin holes. (4) In a coupling device for small-diameter Hume pipes with an inner diameter of less than 700 mm buried by the propulsion method, a cylindrical heat-shrinkable pipe with an adhesive layer provided on the inner surface, which spans between the ends of two butted Hume pipes, is used. Cover with plastic collar,
The end surface of the fume tube is provided with a notch having a circular cross section concentric with the outer peripheral cross section of the fume tube, and the plastic collar is housed in this notch, and A coupling device for a small-diameter hume pipe for a propulsion method, characterized in that a plastic fluid sealing material is interposed between the end faces of the two hume pipes.