JP4644761B2 - Underground conduit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground conduit for use in a tunnel in which water pressure is applied inside and outside, which is used to flow a large amount of liquid in a water supply or sewerage system.
[0002]
[Prior art]
In underground underground conduits used in tunnels where water pressure inside and outside water and sewage is applied, the space between the segment ring and the steel pipe is filled with filler, and the steel pipe is fixed to the segment by some support means. Yes.
[0003]
FIG. 7 is a cross-sectional view showing an example of a conventional steel pipe segment disclosed in Japanese Patent Application Laid-Open No. 7-42492, and is a plan view. As shown in FIGS. 7 and 8, the steel pipe segment is not only composed of the segment 12, the steel plate (steel pipe) 13 and the filler (watertightness maintaining material) 14, but also a plurality of support members for fixing the steel plate 13. 15 (supporting plate 16 and receiving plate 17 and the like) is provided inside the segment 12. (Hereinafter referred to as “prior art 1”).
[0004]
[Problems to be solved by the invention]
In the underground pipe line comprising the steel pipe segment of the prior art 1, the segment ring and the steel pipe are fixed by a support member (support means), and the steel pipe is supported in a rigid state by the segment ring. For this reason, when the internal water pressure load is transmitted to the steel pipe, the force is also transmitted to the segment ring via the support member. On the other hand, the external water pressure load acts on the steel pipe via the segment ring and the support member. For this reason, the design of the segment ring and the design of the steel pipe must be carried out with respect to the internal water pressure and the external water pressure, respectively, and it is necessary to design the support method so that the steel pipe does not buckle against the osmotic water pressure from the outside. is there.
[0005]
In addition, since the segment ring and the steel pipe are integrated with each other via the support member, the entire pipe line behaves as a rigid body even when subjected to an earthquake load, which may affect the deformation of the steel pipe. There is also a problem.
[0006]
Accordingly, an object of the present invention is to solve the above-described problems and provide an underground pipe line which can cope with a hydraulic load inside and outside and has good performance as a water and sewage pipe or the like.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 includes a segment ring, a steel pipe disposed inside the segment ring, a liquid filler with high fluidity filled in a gap between the segment ring and the steel pipe, and the gap. A filler circulation device for allowing the filler to enter and exit the gap according to a volume change of the steel pipe, and the steel pipe is not supported in a rigid state inside the segment ring It has characteristics.
[0008]
According to a second aspect of the present invention, in the first aspect, the outer surface of the steel tube, characterized in that the reinforcing member is provided in a circumferential direction of the steel pipe, according to claim 3, wherein invention The invention according to claim 1 or 2 is characterized in that the circulating device supplies the filler to the gap so that the water pressure outside the pipe line is equal to the pressure of the filler. It is.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0010]
FIGS. 1-6 is drawing which concerns on embodiment of this invention, FIG. 1 is sectional drawing of the underground underground conduit, FIG. 2 is explanatory drawing which shows a segment, FIG. 3 comprises a steel pipe The top view which shows a steel plate, FIG. 4 is a front view, FIG. 5 is the sectional view on the AA line of FIG.
[0011]
As shown in the drawings, the underground underground conduit 1 includes a segment ring 2, a steel pipe 3 inside the segment ring 2, and a filler 4 filled in a gap between the segment ring 2 and the steel pipe 3. It has become.
[0012]
The segment ring 2 is composed of a plurality of RC segments 2a.
The segment 2a is made of a substantially rectangular parallelepiped concrete block, and is formed in an arc shape corresponding to the curvature of the tunnel. A steel pipe segment etc. can also be used as a segment.
[0013]
The steel pipe 3 is arranged inside the segment ring 2 with a predetermined gap between the inner periphery of the segment ring 2. The steel pipe 3 is comprised by joining the some steel pipe member which consists of a rectangular steel plate 3a by welding. The steel plate 3 a has substantially the same curvature as the inner peripheral surface of the segment 2 a so that it can be disposed on the inner peripheral surface of the segment ring 2. A plurality of ribs (reinforcing materials) 5 are provided on the outer peripheral surface of the steel plate 3 a in the circumferential direction of the steel pipe 3.
[0014]
The steel plate 3a is assembled with a packing (not shown) sandwiched between the segment 2a and the steel plate 3a in order to maintain a gap between the segment ring 2 and the steel pipe 3. The packing is made of a material such as hard (vibration-proof) rubber.
[0015]
The filler 4 filled in the gap between the segment ring 2 and the steel pipe 3 is made of a non-hardening material that is fluid and does not consolidate. An aqueous liquid or a resin-based liquid is used as such a filler. It may be used by dissolving in water. Water-soluble ones that are optionally soluble in water are preferred. Furthermore, it is preferable that the filler 4 has anticorrosion performance against the steel pipe 3. Further, it is preferable that the filler 4 is made of a non-toxic material in case it leaks from the welded portion between the steel plates 3a. As a preferred embodiment of the filler 4 of the present invention, “Rasmin MK-11” (registered trademark) or vegetable oil, which is known as a water-soluble anticorrosive material, may be used.
[0016]
The pipe 1 of the present invention configured as described above has only a fluid filler 4 filled in the gap between the segment ring 2 and the steel pipe 3, and there is a means for supporting the segment ring 2 and the steel pipe 3. The steel pipe 3 is not supported in a rigid state inside the segment ring 2. Thus, in the pipe line 1 of the present invention in which only the filler 4 is interposed, the external water pressure load is borne by the segment ring 2 and hardly transmitted to the steel pipe 3. When the steel pipe is fixed to the segment ring by the support member as in the prior art 1, the external water pressure load is directly transmitted to the steel pipe through the support member, and the steel pipe may be buckled and deformed. In addition, the rib 5 provided in the outer surface of the steel pipe 3 acts as a reinforcing material with respect to the external hydraulic load which is transmitted to the steel pipe 3 through the filler 4.
[0017]
On the other hand, the internal water pressure load is borne by the steel pipe 3 and hardly transmitted to the segment ring 2. Further, the filler 4 enters and exits according to the change in the void volume when the steel pipe 3 expands (expands) or contracts due to the change in the internal water pressure, and acts as a cushion so that the internal water pressure load is not transmitted to the segment. Therefore, the segment ring does not need to consider the internal water pressure. Further, in order to assist the entry / exit of the filler 4, a circulation device for controlling the filling pressure and the filling amount of the filler 4 may be provided. FIG. 6 is an explanatory view showing a filler circulation device. In this embodiment, the filler circulation device 6 shown in FIG. 6 is a vertical shaft so that the volume can be adjusted to the extent that it does not affect the segment ring 2 when the internal water pressure acts on the steel pipe 3 and expands (expands). 7 is provided. The filler 4 is sent from the lorry vehicle 8 to the filler replenishing tank 9 and the filler adjusting tank 10 via the conduit, and further sent to the gap between the segment ring 2 and the steel pipe 3. The pore water pressure gauge A measures the water pressure outside the underground pipe 1, and the pore water pressure gauge B measures the filler pressure in the gap between the segment ring 2 and the steel pipe 3. The adjustment valve C between the tanks 9 and 10 is opened so that the filler 4 is replenished to the filler adjustment tank 10 so that the pore water pressure gauges A and B have the same pressure. 11 is a control device. The circulation device 6 is disposed at predetermined intervals in the longitudinal direction of the pipe line 1.
[0018]
Furthermore, the filler 4 also acts as a shock absorber for the earthquake shock during an earthquake, and can relieve the load on the entire pipeline.
[0019]
【The invention's effect】
As described above, according to the present invention, only the fluid filler is interposed, and the steel pipe is not supported by the segment in a rigid state, so the external water pressure load is not transmitted to the steel pipe by the segment, The internal water pressure load is not transmitted to the segment by the steel pipe, but the external water pressure load transmitted to the steel pipe through the filler can be dealt with by the reinforcing material provided on the steel pipe, and the steel pipe is buckled and deformed. Further, in the event of an earthquake, the filler acts as a shock absorber for the earthquake, and can reduce the load on the entire pipeline, thus providing a useful effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an underground burial conduit according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing segments according to the embodiment of the present invention.
FIG. 3 is a plan view showing a steel plate constituting the steel pipe according to the embodiment of the present invention.
FIG. 4 is a front view showing a steel plate constituting the steel pipe according to the embodiment of the present invention.
5 is a cross-sectional view taken along line AA in FIG.
FIG. 6 is an explanatory view showing a filler circulating apparatus according to an embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a conventional steel pipe segment.
8 is a plan view of FIG. 7. FIG.
[Explanation of symbols]
1 Pipeline for underground burial 2 Segment ring 2a Segment 3 Steel pipe 3a Steel plate (steel pipe member)
4 Filler 5 Rib (Reinforcing material)
6 Circulating device 7 Vertical shaft 8 Raleigh vehicle 9 Filling material replenishment tank 10 Filling material adjustment tank 11 Control device 12 Segment 13 Steel plate 14 Filling material (watertightness maintaining material)
15 Support member 16 Support plate 17 Receiving plate A, B Pore water pressure gauge C Adjustment valve

Claims (3)

A segment ring, a steel pipe disposed inside the segment ring, a liquid filler having a high fluidity filled in a gap between the segment ring and the steel pipe, and a change in volume of the gap. An underground pipe comprising: a filler circulation device for allowing the filler to enter and exit the gap , wherein the steel pipe is not supported in a rigid state inside the segment ring. Road. The outer surface of the steel pipe, the circumferential direction reinforcing member is provided, underground conduit of claim 1 wherein said steel pipe. 3. The underground embedment according to claim 1, wherein the circulation device supplies the filler to the gap so that a water pressure outside a pipe line is equal to a pressure of the filler. 4. Pipeline.

Images