JP2003004168A - Joint part structure of jacking pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform waterproofing protection of members such as a push ring, a bolt and the outer surface of a spigot exposed to the outside of a pipe, from sediment or grout with simple structure in the case of laying an earthquake resistant pipe in a jacking method. SOLUTION: In the jacking method, an embedded material 12 is disposed at the outer periphery of the spigot 2 between the end face of a socket part external facing material 11 and the end face of a spigot part external facing material 11 so that the outer surface is inside the external facing material. A sleeve 14 made of synthetic resin is put on from the socket part external facing material 11 to the spigot part external facing material 11 while covering the outer periphery of the embedded material 12. Further, a cylindrical sheet cover 13 is put on from the end face of the socket part external facing material 11 to the end face of the spigot part external facing material 11 while covering the outer surface of the synthetic resin sleeve 14 so as to be almost flush with the outer surface of the external facing material 11.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a propulsion pipe. 2. Description of the Related Art As a method of laying underground pipes, a propulsion method is known. In this propulsion method, in order to allow the receiving port and the insertion port to expand and contract in the axial direction, as shown in FIG. The propulsion pipe 1 is propelled by the propulsion method in this state, and the liner 4 is removed after the pipe is laid.
Is also provided. [0003] In Fig. 8, reference numeral 5 denotes an inner surface cement lining layer of the ductile propulsion pipe 1, 6 denotes a separation prevention ring, 7 denotes a rubber ring, and 8 denotes a pressing ring. [0004] The outer periphery of the propulsion pipe 1 is coated with an exterior material 11 made of concrete or the like except for the opening 2 for corrosion protection and reduction of propulsion resistance. In the case of a joint of the type shown in FIG. 8, in order to protect the push ring 8 and the fastening bolt 10 from earth and sand and grout, they are covered with an embedding material 12, and furthermore, a thin plate is laid over the surface of both exterior materials. The tubular cover 13 is attached. However, since the cover body 13 does not have water tightness, if the cover body 13 is buried in the ground made of groundwater or corrosive soil, the outer surface of the insertion opening 2 may be corroded by groundwater. There was a problem. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. When an earthquake-resistant pipe is to be laid by a propulsion method, it is necessary to protect an outer surface of an insertion port, a push ring, a bolt, and the like from earth and sand and grout. At the same time, the purpose is to provide a simple structure for waterproof protection from groundwater. In order to achieve this object, the joint structure of a propulsion pipe according to the present invention has one end of a straight pipe capable of receiving an insertion port and the other end capable of receiving an insertion port of another pipe. A state in which a propulsion pipe, which is a receiving port and is covered with an exterior material having the same outer diameter except for the insertion portion from the receiving end to the inserting portion, is inserted into the receiving end by inserting a liner at the inserting end. In the propulsion method of propelling in the pipeline direction, between the end surface of the receiving-side exterior material and the end surface of the insertion-side exterior material, an embedding material is disposed on the outer periphery of the insertion port so that the outer surface is inside the exterior material. Covering the outer periphery of the embedding material, covering a sleeve made of synthetic resin from the receiving side exterior material to the insertion side exterior material, and further covering the outer surface of the synthetic resin sleeve, A thin plate between the end surface of the receiving side exterior material and the end surface of the insertion side exterior material so that it is almost flush with the outer surface It is characterized by being covered with a cylindrical cover. With this structure, the joint portion is waterproofed by the synthetic resin sleeve disposed on the back side of the thin tubular cover, and is effectively protected from corrosive soil and corrosion caused by infiltration of groundwater. [0010] Further, the joint components such as the seal rubber and the press ring of the joint portion are protected from the surrounding soil by the thin-plate cylindrical cover, and the synthetic resin sleeve is also protected from the surrounding soil. It is unlikely to occur and the waterproofness of the joint is maintained for a long period of time. Next, an embodiment of a joint structure of an earthquake-resistant propulsion pipe according to the present invention will be described. FIG. 1 is a sectional view of an essential part in an axial direction of an embodiment of the present invention, and FIG.
-It is an X-ray sectional view. The joint structure of a propulsion pipe according to the present invention, as shown in FIG.
In the space on the outer peripheral surface of the insertion opening 2 between the end surface of
An embedding material 12 made of expanded polystyrene, for example, is provided to cover the metal ring, the push ring 8 and the bolt 10, and covers the embedding material 12 from the receiving side exterior material 11 to the insertion side exterior material 1.
1 is covered with a sleeve made of a synthetic resin, for example, a polyethylene sleeve (hereinafter referred to as a polyethylene sleeve) 14. Both ends of the polyethylene sleeve 14 are water-tightly attached to the surface of the exterior material 11 by wide waterproof adhesive tapes 15, 15. Note that, instead of the adhesive tape 15 in the illustrated example, it may be tightened with a rubber band or the like. Then, between the end face of the receiving side exterior material 11 and the end face of the insertion side exterior material 11 so as to cover the outer periphery of the polyethylene
Although the thickness is shown thick for explanation, the thin plate cylindrical cover 13 is shown.
Is covered. In the above, cutout steps 11a, 11a for installing the cylindrical cover 13 are formed near the ends of the exterior material 11 of the receptacle 3 and the exterior material 11 of the insertion opening 2. In FIG. 2, reference numeral 16 denotes a rivet, which is used to fix an end of the band-shaped sheet metal 13a when winding the band-shaped sheet metal 13a to be the cylindrical cover 13. Reference numeral 18 in the figure denotes a protection plate for protecting the polyethylene sleeve 14 from a drilling tool or the like when the rivet 16 is driven or a rivet hole is formed in the band-shaped sheet metal 13a. Protection plate 1
8 is formed along the axial direction. As shown in FIG. 2, the filling material 12 to be filled in the outer surface of the insertion port 2 is a molded product made of a foamed synthetic resin divided into two or four parts which can be externally fitted on the outer surface of the insertion port 2. . The embedding material 12 has such a strength that it is easily compressed or deformed or broken between the insertion opening 2 and the receiving opening 3 when a strong axial external force due to an earthquake or the like is applied. A molded body such as foamed rubber is used, and is disposed without a gap along the outer circumferential surface of the insertion opening 2 as shown in FIG. Next, the construction of the joint structure for an earthquake-resistant propulsion pipe according to the present invention will be described. As shown in FIG. 3, a lock ring 6 is installed in the receiving port 3 of the propulsion pipe 1 and a sealing rubber ring 7 is provided.
Is inserted into the socket 3 and, if necessary, a liner 4 is inserted at the tip if necessary. After the insertion, the push ring 8 is attached, the fastening bolt 10 is tightened, and the sealing rubber ring 7 is removed. Compress. Then, as shown in FIG.
An embedding material 12 is provided between the end surfaces of the first and second fittings 1 to fit over the entire circumference from the outer surface of the insertion opening 2, the press ring 8, the fastening bolt 10, and the like. Next, a polyethylene sleeve 14 previously covered with the insertion port 2 being lifted up on the outer surface is inserted into the embedding material 1.
2 Pull back to the upper surface, and as shown in FIG.
From the front side to the insertion side exterior material 11, and water-tightly fixed at both ends with a waterproof adhesive tape 15 or a rubber band (an example of an adhesive tape is shown in the figure). Waterproof seal the outer peripheral surface. When the band-shaped sheet metal 13a to be the thin-plate cylindrical cover 13 is attached and constructed thereafter, the polyethylene sleeve 14 is protected from a tool for drilling bolt holes 13b in the band-shaped sheet metal or driving a rivet 16. For this reason, a metal protective plate 18 is attached to an appropriate portion of the outer surface of the polyethylene sleeve 14 as shown in FIG.
9 and so on. Next, a belt-shaped sheet metal 13a is temporarily wound thereon, and holes 13b for rivets are adjusted to the perimeter by using a drill tool (not shown).
Drill at the position where is arranged. Accordingly, the polyethylene sleeve 14 is protected from the drilling tool by the metal protection plate 18, and through holes 13b for rivets are formed in the sheet metal 13a without forming a break. Next, as shown in FIG.
a is wound from above the polyethylene sleeve 14, and the ends are fixed with rivets 16 (FIG. 2) to form the cylindrical cover 13.
Since the inner surface of the cylindrical cover 13 is supported by the embedding material 12, even if it is made of a thin sheet metal, it does not easily deform into a concave shape. Therefore, when the pipe 1 is directly propelled into the ground by the propulsion method, or when the inside of a pod such as a fume pipe already inserted as a pod method is propelled,
Even if radial pressure from the ground is applied to the cylindrical cover 13, the cylindrical cover 13 is not deformed and damaged.
It is possible to prevent earth and sand and grout from entering the zero portion and the sealing rubber ring 7 portion. The insertion opening 2 is a polyethylene sleeve 14
Is sealed from groundwater, so that it is protected from corrosion caused by groundwater infiltration. After completion of the pipe laying,
As shown in (1), the liner 4 is removed from the inside of the pipe, and an allowance S is provided. When a large external force such as an earthquake is applied and an axial expansion and contraction force is applied to the pipe, as shown in FIG.
3 is made of a thin sheet metal and easily deformed, has little resistance to the axial displacement of the tube, and has an embedding material 12.
Is compressed and deformed, and does not become a resistance of the expansion and contraction allowance S. As described above, according to the joint structure for a propulsion pipe of the present invention, a pipe that needs to protect a push ring, its fastening bolt, or a rubber ring for sealing from earth and sand or grout. When the propulsion method is used, these are covered with a sleeve made of synthetic resin, so the water resistance is much better than when covered with a conventional embedding material and a thin tubular cover, and the corrosive soil and groundwater Tubes can be used for long periods of time without fear of corrosion in many areas.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axially enlarged sectional view of a pipe joint according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line XX of the entire tube of FIG. FIG. 3 is an explanatory cross-sectional view of a process of connecting a pipe joint according to the embodiment of the present invention. FIG. 4 is an explanatory cross-sectional view of a process of connecting a pipe joint according to the embodiment of the present invention. FIG. 5 is an explanatory cross-sectional view of a process of connecting a pipe joint according to the embodiment of the present invention. FIG. 6 is a fragmentary side view for explaining a connecting step of the pipe joint in the embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating an earthquake-resistant function. FIG. 8 is a sectional view of a main part of a conventional pipe joint. [Description of Signs] 1 Pipe 2 Insertion opening 3 Reception opening 7 Seal rubber 8 Press ring 10 Bolt 11 Exterior material 12 Embedding material 13 Thin tubular cover 14 Sleeve made of synthetic resin (polyethylene sleeve) 15 Waterproof adhesive tape

Claims (1)

[Claim 1] One end of a straight pipe is an insertion port, and the other end is a reception port capable of receiving an insertion port of another pipe, except for the insertion port portion from the reception port tip to the insertion port portion. In the propulsion method in which the propulsion pipe covered with the exterior material is propelled in the pipe direction in a state in which the insertion port is inserted into the reception port, the gap between the reception-side exterior material end face and the insertion-side exterior material end face is reduced. An embedding material is provided on the outer peripheral surface of the insertion opening, and a synthetic resin sleeve is placed between the reception-side exterior material and the insertion-side exterior material so as to cover the outer peripheral surface of the embedding material. A thin tubular cover is placed between the end surface of the receiving-side exterior material and the end surface of the insertion-side exterior material so as to cover the outer peripheral surface of the resin sleeve and to be substantially flush with the outer peripheral surface of the exterior material. The joint structure of the propulsion pipe.