JP4430191B2 - High pressure gas storage facility in bedrock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high pressure gas storage facility in a rock.
[0002]
[Prior art]
The structure of equipment for storing gas such as city gas at high pressure in the bedrock is airtight on the inner surface of the segment by, for example, fixing a reinforced concrete segment back to the inner surface of the cavity formed in the bedrock. Those having a metal lining layer are being studied.
[0003]
In such a structure, the airtightness is secured by the metal lining layer, the pressure resistance is maintained by the rock, and the internal pressure is uniformly transmitted by the segment and the backfill layer.
[0004]
In the metal lining layer that secures airtightness, in order to absorb the strain caused by the high internal pressure, a protrusion projecting to the inner surface side is provided, and a rock storage facility using this as a strain absorbing structure is disclosed in, for example, JP-A-6-144485. Proposed in the Gazette.
[0005]
However, such a high-pressure gas storage facility has technical problems described below.
[0006]
[Problems to be solved by the invention]
That is, in the rock storage facility with the above structure, after excavating the cavity in the rock, a segment is installed along the inner surface side, and this is fixed with a backfill material, and then the metal lining layer is post-constructed. Since the installation procedure is installed at, there is a problem that the construction period becomes long and the construction cost increases.
[0007]
In addition, if a strain absorbing structure including protrusions protruding inward is provided on the metal lining layer, this may be damaged when the heavy machinery is moved, and airtightness may be impaired.
[0008]
The present invention has been made in view of such problems, and the object of the invention is to shorten the work period and reduce the construction cost while avoiding damaging the strain absorbing portion. It is to provide an in-bed storage facility for high pressure gas.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a plurality of segments back-fixed to the inner surface of a cavity portion formed in a rock, and an airtight metal lining layer provided on the inner surface of the segment. In a high-pressure gas storage facility, the divided metal lining layer is integrated on the inner peripheral surface of the segment in advance, and a stepped notch is provided at the joint of the segment, and the segment is assembled in an annular shape. In this case, in the concave portion formed by the adjacent notch portion, the peripheral edges of the divided metal lining layers are welded to each other, and a strain absorbing portion that is invaded into the concave portion is provided.
According to the high-pressure gas storage facility constructed in this way, the metal lining layer divided into the inner peripheral surface of the segment is integrated in advance, so the installation work of the metal lining layer becomes unnecessary, The construction period can be shortened compared with the case of forming by post-construction, and as a result, the construction cost can be reduced.
Further, in the storage facility in the rock according to the present invention, when the segment is provided with a stepped notch at the periphery of the segment and the segments are assembled in an annular shape, the metal lining divided in the recess formed by the adjacent notch Since the peripheries of the layers are welded to each other to provide a strain absorbing part that intrudes into the recess, the metal lining layer has no part protruding inward, and the strain absorbing part is moved by the movement of heavy machinery and machinery during construction. Will not be damaged.
Furthermore, if the portion that protrudes inward from the metal lining layer is eliminated, the inside of the storage unit becomes smooth, so that the machine for maintenance can be easily moved and the maintenance work can be rationalized.
The segment is provided with the notch portion at least in the circumferential joint portion, and provided with a bent portion that is recessed toward the notch portion at the edge of the divided metal lining layer, and is provided adjacent to the circumferential direction. By overlapping and welding the bent portions of the segments, a substantially V-shaped strain absorbing portion can be obtained.
According to this configuration, the bent portions that are recessed toward the notch portions are provided on the edges of the divided metal lining layers, and the bent portions of the segments that are adjacently installed in the circumferential direction are overlapped and welded. The V-shaped strain absorbing part facilitates welding work, and by forming the strain absorbing part into a substantially V-shaped shape, the V-shape opens when internal pressure is applied, allowing smooth deformation tracking. Sex is obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. FIG. 1 and FIG. 2 show an embodiment of the high-pressure gas storage facility in the rock according to the present invention.
[0011]
The in-rock storage facility shown in the figure is a tunnel-like structure closed at both ends, and FIG. 1 shows a vertical section thereof. The storage facility in the rock according to the present embodiment includes a plurality of segments 14 fixed to the inner surface of a cavity 12 formed in the rock 10 by a backfill layer 13, and an airtight metal lining provided on the inner surface of the segment 14. Layer 16.
[0012]
The cavity 12 is excavated by a tunnel boring machine or the like, and a segment 14 is annularly installed on the inner surface side of the cavity 12. The segment 14 has a shape obtained by dividing a hollow cylindrical body into a plurality of portions in the circumferential and axial directions.
[0013]
FIG. 2 shows a cross section of a piece of segment 14 that has been divided. The segment 14 shown in the figure is made of reinforced concrete and is a precast product produced in advance in a factory, and is composed of a reinforcing bar 14a and a concrete body 14b.
[0014]
The reinforcing bars 14a are arranged vertically and horizontally, and are embedded in a concrete body 14b having a predetermined thickness. The outer peripheral surface of the concrete body 14b is curvedly formed with a predetermined curvature surface.
[0015]
Further, the segment 14 of the present embodiment is provided with a stepped notch 14d at a circumferential joint (left and right in FIG. 2). This notch part 14d is formed by removing the inner edge part of the concrete body 14c so that the thickness is substantially halved.
[0016]
The metal lining layer 16 is made of, for example, a thin steel plate such as carbon steel or stainless steel. In the case of the present embodiment, the divided metal lining layer 16 is integrated in advance on the inner peripheral side of the segment 14. Has been.
[0017]
In order to integrate the metal lining layer 16 into the segment 14, the metal lining layer 16 is disposed in advance by a method such as placing concrete and locking it to the reinforcing bar 14b before forming the concrete body 14c. Then, concrete may be laid.
[0018]
The metal lining layer 16 of the present embodiment is formed with bent portions 16a and 16b at the edge on the circumferential side of the joint portion. One bent portion 16 a is bent so as to be recessed into the cutout portion 14 d of the segment 14.
[0019]
The other bent portion 16b is bent into a substantially L shape so as to be inserted into the notch portion 14d of the segment 14, and the tip end side thereof slightly protrudes to the side of the notch portion 14d. When constructing an in-bed storage facility for high-pressure gas, the segments 14 are annularly installed along the inner surface side of the excavated cavity 12.
[0020]
The installed segment 14 injects a curable backfilling material such as mortar from a pre-filled injection hole, and the backfilling layer 13 formed by curing the backfilling material results in the inner surface of the cavity 12. Fixed to the side.
[0021]
At this time, in the case of the present embodiment, the notches 14d are provided in the circumferential joints of the segments 14, so that when the segments 14 are arranged in an annular shape, the circumferential joints are adjacent to each other. By combining the notch 14d, a recess 18 that is recessed into the inner surface is formed.
[0022]
In addition, when the segments 14 are installed in a ring shape, the bent portions 16a and 16b on both side edges of the metal lining layer 16 that are integrated in advance on the inner surface side of each segment 14 are connected to other segments adjacent in the circumferential direction. The 14 metal lining layers 16 are overlapped with each other in the concave portions 18 and 16b.
[0023]
In other words, in the case of the present embodiment, one bent portion 16b of the metal lining layer 16 is bent in an L shape, so that it is adjacent in the circumferential direction as shown partially enlarged in FIG. The bent portions 16a on the other side of the metal lining layer 16 are overlapped with each other so as to be along the inner side of the L shape.
[0024]
As described above, when the segment 14 is installed, when the bent portions 16a and 16b overlapped in the recess 18 are welded, the divided metal lining layers 16 are connected to each other, and airtightness is ensured. The
[0025]
In this case, when the bent portions 16 a and 16 b are welded, a V-shaped portion that is recessed into the concave portion 18 is formed, and this becomes the strain absorbing portion 20. In the above embodiment, the case has been described in which the concave portion 18 is provided in the joint portion in the circumferential direction of the segment 14 and the strain absorption 20 that is invaded into the concave portion 18 is formed, but the joint portion in the axial direction of the segment 14 is described. Such a strain absorbing part 20 can be provided, but it is not always necessary.
[0026]
Now, according to the high-pressure gas storage facility constructed as described above, since the metal lining layer 16 divided into the inner peripheral surface of the segment 14 is integrated in advance, the installation work of the metal lining layer 16 is unnecessary. Therefore, the construction period can be shortened compared with the case where all of these are formed by post-construction, and as a result, the construction cost can be reduced.
[0027]
Further, in the rock storage facility having the above-described configuration, the step 14d is provided at least in the circumferential joint portion of the segment 14, and when the segment 14 is assembled in an annular shape, the recess 18 is formed by the adjacent notch 14d. Thus, the bent portions 16a and 16b on the periphery of the divided metal lining layer 16 are welded to each other to provide the strain absorbing portion 20 that is recessed into the recess 18, so that the portion that protrudes inward to the metal lining layer 16 is provided. The strain absorber 20 is not damaged by the movement of heavy machinery and machines during construction.
[0028]
Furthermore, if the metal lining layer 16 has no inwardly protruding portion, the inside of the storage unit becomes smooth, so that the machine for maintenance can be easily moved and the maintenance work can be rationalized.
[0029]
Further, in the case of the above embodiment, the segment 14 is provided with a notch 14d at least in the circumferential joint, and is bent at the edge of the divided metal lining layer 16 toward the notch 14d. 16a and 16b are provided, and the bent portions 16a and 16b of the segments 14 installed adjacent to each other in the circumferential direction are overlapped and welded to form a substantially V-shaped strain absorbing portion 20.
[0030]
According to such a configuration, the welding operation can be facilitated, and the distortion absorbing portion 20 is formed in a substantially V shape so that when the internal pressure is applied, the V shape opens so that smooth deformation followability can be obtained. can get.
[0031]
In addition, in the said Example, the storage equipment in the rock mass of circular section was illustrated, However, Implementation of this invention is not restricted to this, For example, an elliptical section, a polygonal section, etc. may be sufficient.
[0032]
【The invention's effect】
As described above in detail, according to the high-pressure gas storage facility in the rock according to the present invention, it is possible to shorten the construction period and reduce the construction cost while avoiding damage to the strain absorbing portion. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a high pressure gas storage facility in a rock according to the present invention.
FIG. 2 is a cross-sectional explanatory view of a segment used in equipment in the storage unit of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bedrock 12 Cavity part 14 Backfill layer 14 Segment 14a Skin plate 14b Reinforcing bar 14c Concrete body 14d Notch part 16 Metal lining layers 16a and 16b Bending part 18 Recessed part 20 Strain absorption part

Claims (2)

In a high-pressure gas in-story storage facility having a plurality of segments back-fixed to the inner surface of a hollow portion formed in the rock, and an airtight metal lining layer provided on the inner surface of the segment,
While integrating the divided metal lining layer in advance on the inner peripheral surface of the segment,
A stepped notch is provided at the joint of the segment,
When the segments are assembled in an annular shape, a strain absorbing portion is provided in which the peripheral edges of the divided metal lining layers are welded to each other in the recess formed by the adjacent notch, and are inserted into the recess. A high-pressure gas storage facility in the rock. The segments are each provided with at least the notch at the circumferential joint,
Provided with bent portions that are indented into the notch portion side at the edge of the divided metal lining layer,
The high pressure gas in-bed storage facility according to claim 1, wherein the bent portions of the segments adjacently installed in the circumferential direction are overlapped and welded to form a substantially V-shaped strain absorbing portion.

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