JPH0433360B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to buried pipes for curved roads, and in particular to the promotion of sequentially laying hump pipes etc. in an excavated pit using a press-in device installed in the pit. This invention relates to buried pipes for curved roads that are suitable for use in construction methods.

<Conventional technology> In general, the laying of humu pipes using the propulsion method is as follows:
This is done by the method shown in FIG. That is, a series of hume pipes 31, 31, . . . in the pit 30.
While excavating the face ground with the shield excavator 28 installed at the tip of the
1, new hume pipes are sequentially inserted into the rear end, that is, the starting shaft 29, and the new hume pipes are propelled forward according to the excavation speed by a press-fitting device (not shown) provided in the starting shaft 29. , a series of hume tubes 31 are moved forward all at once. The connecting portion 32 (pipe joint portion) between the fume pipes 31 is connected to the straight portion 30 of the shaft.
In part a, there is complete contact without any opening, but in the curved part 30b of the pit, the radius of curvature R ₁ and R ₂
Openings S ₁ , S ₂ , S ₃ , S ₄ ,
S ₅ while touching each other in a state close to point contact on the inside. FIG. 10 is a detailed cross-sectional view showing such a state, and shows the adjacent Huum tubes 31, 3.
1' are connected to each other by a steel collar 34 that is tightly fitted to both ends via an annular rubber gasket 33 that is fitted to the outer periphery of the end of one 31'.
The press-fitting thrust transmitted from the rear hume pipe by the press-fitting device is concentratedly applied to the connecting portion 35 which is close to point contact, and this connecting portion 35 reaches a stress exceeding the proof strength of the hume pipe, causing cracks 36 and damage. I will do it.

Conventionally, to prevent such cracking and damage,
The method shown in Figures 11 and 12 is used in the curved road propulsion method. That is, on the opposing end surfaces of the respective hume pipes 31 and 31', which are connected to each other by the steel collar 34 via the annular rubber gasket 33,
A plurality of seat plates 37, 37' are brought into contact with each other, screw type jacks 38 are inserted between these seat plates 37, 37' at equal intervals in the circumferential direction, and screws are inserted so as to follow a curved path with a radius of curvature R. Adjustments are made to distribute the press-fitting thrust and prevent damage to the end of the hume tube.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional method for propulsion of humuum pipes along curved paths, as the shield excavator 28 at the tip (see FIG. 9) moves forward, each connection portion 32 between the hume pipes 31 , 32, _. . . , S ₅ change from moment to moment, the screws of the screw jacks 38 must be frequently adjusted for each connection portion 32 in response to these changes. As a result, the frequency of adjustment and the number of adjustment points become extremely large, and the adjustment work is limited to the narrow interior of the Huum pipe, resulting in an extremely low work efficiency. Therefore, there is a problem in that currently, the fume pipes that can be constructed by this method are limited to those with an inner diameter of 1 m or more, considering the work space and construction efficiency, and the fume pipes with smaller diameters cannot be constructed.

Therefore, the purpose of the present invention is to eliminate the need for complicated adjustment work by devising the shape of the end face of the buried pipe.
To provide buried pipes for curved roads that can be laid with high efficiency by a curved road propulsion method, etc., even down to small diameter pipes, without causing damage to the joints between the buried pipes.

<Means for Solving the Problems> In order to achieve the above object, the buried pipe for curved roads of the present invention has one end surface of the pipe body with a fixed size between the inner radius and the outer radius. It is characterized in that it is formed into a convex or concave surface with a radius of curvature, and the other end surface of the tube is formed into a concave or convex surface with substantially the same radius of curvature as the convex or concave surface.

<Function> In a series of buried pipes for curved paths inserted into an excavated pit, for example, one end surface of the pipe body is made convex,
Each buried pipe for curved roads has a concave end surface.
The front end, which is a convex surface with a constant radius of curvature between the inner radius and the outer radius of this pipe, is connected to the rear end, which is a concave surface with approximately the same radius of curvature as that of the buried pipe for curved roads adjacent to the front. The front end of the curved buried pipe adjacent to the rear has a convex surface of the same curvature and is fitted to the rear end of the concave surface with approximately the same radius of curvature, allowing relative rotation at each connection part. And they are connected sequentially without creating any openings. Therefore, for example, if the rear end of a series of buried pipes for curved roads is pushed forward by a press-fitting device,
Since the press-fitting thrust is uniformly distributed and applied to the end surfaces of the buried pipes for curved roads in contact with each other over a relatively wide area at each joint, there is no damage to these end faces, and the buried pipes for curved roads are The steel can be rotated freely and smoothly moved forward along the excavated curved path, and by sequentially adding buried pipes for the curved path to the rear end of the tunnel, all the pipes into the tunnel are Buried pipes for curved roads can be laid. In addition, the same thing as described above can be said when a curved buried pipe having convex ends and a curved buried pipe having concave ends are alternately connected in series.

<Examples> Hereinafter, the present invention will be explained in detail with reference to illustrated examples.

In Fig. 1, 1, 1, ... are Huyum pipes as buried pipes for curved paths that are successively connected in the excavated pit.
2 is a point C ₁ on the tube axis l ₁ at the front end of this hume tube 1
3 is a concave hemispherical surface formed with the same radius of curvature ρ and centered on the point C ₂ on the tube axis l ₁ at the rear end of the Hume tube 1. , 4 is an annular rubber gasket fitted to the front end of the hume tube 1, and 5 is a steel collar fitted to the rear and front ends of the adjacent hume tubes 1, 1.

The radius of curvature ρ of both hemispherical surfaces 2 and 3 is approximately equal to the outer radius ro of the Huumian canal 1, and in any pair of adjacent Huumian canals, one hemispherical surface 2 has a convex front end, and the other hemispherical surface 2 has a concave rear end. It is tightly fitted into the hemispherical surface 3 so as to be relatively rotatable. The rubber packing 4 is fitted into an annular groove 7 provided in an annular notch 6 on the outer periphery of the front end of the hump tube 1, and the steel collar 5 is inserted into the annular notch 6 so as to cover the rubber packing 4.
It fits into an annular notch 8 on the outer periphery of the rear end of the hume tube 1 to form an outer circumferential surface having approximately the same diameter as the hume tube 1 (see FIG. 5).

The hume pipes having the above structure are sequentially laid in the excavated pit as shown in FIG. That is, the shield excavator installed at the tip of the pit 10 (2 in Fig. 9)
While excavating the ground at the face surface using the same method (see 29), the rear end of a series of hump pipes 1, 1, ... connected to the rear of the tunnel is adjusted to match the excavation speed by a press-in device (not shown) installed in the starting shaft (see 29). Propel it forward. Then, the press-fitting thrust is uniformly distributed and applied to each connection part 9, 9, ... of the hume tubes 1, 1, ..., which fit smoothly with a wide contact area, and is transmitted to the tip, and the series of hume tubes is The excavated shaft 10 can be freely rotated at the same time to move smoothly forward along the curved path of the excavated pit 10. In this way, when the above-mentioned press-fitting device finishes propelling the stroke for one hume pipe, a new hume pipe is inserted into the above-mentioned starting shaft, fitted into the rear end of the series of hume pipes, and similarly moved forward according to the excavation speed. It promotes it.

FIG. 2 shows a modification of the embodiment shown in FIG. The configuration is the same as that of FIG. 1 except that it is a constant value that is larger and smaller than the outer radius ro. Therefore, a stepped portion 11 is formed between the annular notch 6 on the outer periphery of the front end of the hume tube 1 and the convex hemispherical surface 2. Then, the hume pipes 1 are sequentially laid in the excavated pit 10 as shown in FIG. 4.

FIG. 5 is a partially detailed view of the connecting part 9 of the hume tubes 1, 1 of FIG.
A plurality of injection holes 13 are provided which communicate with an annular space 12 surrounded by a rubber packing 4. When a series of fume pipes have been laid in the pit 10, a resin-based or cemento-based water stop material is injected from inside the pipes into the annular space through the injection holes 13 to completely seal the pipe joints. I try to do a seal.

6 and 7 show a modification of the hume tube 1 which does not require the steel collar 5 shown in FIGS. 1 and 2. A groove 14 is cut into the annular groove 14, and an annular packing material 15 is fitted into the annular groove 14 so as to come into close contact with the concave hemispherical surface 3 of the rear end of the adjacent hume tube.
Therefore, there is no need to sequentially fit the steel collars 5 for sealing onto each of the joints 9 of the fume pipe during installation, and construction efficiency is further improved.

The above embodiments and modifications can be applied even if the excavated pit is curved three-dimensionally, but if the pit is curved two-dimensionally, that is, within one plane,
A Huum tube as shown in FIG. 8 is applicable. As shown in FIGS. 8a and 8b, the hume tube 21 has a front end formed into a convex shape with a radius ρ'(ri<ρ'<ro) with its center axis being a vertical line _C1 perpendicular to the tube axis _l3 . It is formed of a semi-cylindrical surface 22, and its rear end is formed of a concave semi-cylindrical surface 23 having the same radius ρ _' with its center axis being a vertical line C2 perpendicular to the tube axis _l3 . Then, they are laid one after another in the excavated pit in a plan view similar to that shown in FIG. 6.

In the buried pipe for curved roads of the present invention, the radius of curvature ρ, ρ' of the hemispherical surfaces 2, 3 and semicylindrical surfaces 22, 23 is
21, the inner radius ri or more and the outer radius ro or less are set so that the contact area of the hume tube at the connection part 9 becomes narrow and damage does not occur during press-fitting. It can be said that the width of the outer circumferential stepped portion of No. 9 does not become large and is suitable for actual laying construction.

In the above embodiments and modifications, one end surface of the tube body was formed to be a convex surface and the other end surface was formed to be a concave surface.
It is also possible to alternately connect a hume pipe with convex ends and a hume pipe with concave ends, and furthermore, the buried pipe for curved roads of the present invention can be applied to the hume pipes of the above embodiments and modifications. It is not limited to this, and may be a steel pipe or the like.

<Effects of the Invention> As is clear from the above explanation, the buried pipe for curved roads of the present invention has one end surface of the pipe body having a constant radius of curvature between the inner radius and the outer radius. In addition to forming a convex or concave surface, the other end surface of the pipe body is formed as a concave or convex surface having approximately the same radius of curvature as the convex or concave surface, so that any pair of adjacent buried pipes will have one convex surface. is fitted into the other concave surface so as to be relatively rotatable, and is connected in a series, and by press-fitting and propelling the rear end, it is possible to smoothly advance all at once along the curved path of the excavated pit, and the adjacent The contact area between buried pipes is also increased, eliminating damage at the joints, which greatly contributes to improving the efficiency of laying underground pipes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figures are sectional views showing modified examples of the present invention, Figures 3 and 4.
The figure is a schematic diagram showing a buried example according to the present invention, FIG. 5 is a detailed view of the V section in FIG. 2, FIG. 6 is a sectional view showing a modification of the present invention, and FIG. 7 is a detailed view of the part in FIG. , 8th
Figures a, b, c, and d are respectively a plan view, a side view, a front view, and a rear view of modified examples of the present invention. Figure 9 is a schematic plan view showing a conventional humid pipe laying method. Figure 10 is a schematic plan view showing a conventional humid pipe laying method. 9 is a detailed partial view, FIG. 11 is a cross-sectional view showing a conventional hume tube connection, and FIG. 12 is a partial detail view of FIG. 11.
It is a view taken along arrows XII-XII. 1... Huyum tube, 2... Convex hemisphere, 3...
Concave hemispherical surface, 4...Rubber gasket, 5...Steel collar, 10...Hole, 13...Injection hole, 21...Hyum tube, 22...Convex semi-cylindrical surface, 23...Concave semi-cylindrical surface Surface, ρ, ρ′...radius of curvature, ro...outer radius,
ri...inner radius.

Claims (1)

[Claims] 1 One end surface of the tube is formed into a convex or concave surface with a constant radius of curvature between the inner radius and the outer radius, and the other end surface of the tube is formed with approximately the same curvature as the convex or concave surface. A buried pipe for curved roads characterized by being formed into a concave or convex surface with a radius.