JP3848473B2 - Protection structure and protective member for shield tunnel inner surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly protects the inner surface of a shield tunnel formed by a concrete segment from the end face of a beam material made of a steel beam (same as H-shaped steel or I-shaped steel) laid on the inner surface in the width direction. And a protective member as a protector used for the protective structure.
[0002]
[Prior art]
FIG. 12 is a schematic front view showing a conventional protection structure of this type. At present, when the shield tunnel 1 is formed by the shield method as an underground buried groove for laying electric cables, telephone cables, gas pipes, etc., the inner surface 1a of the shield tunnel is constituted by a primary lining segment made of a concrete segment. Secondary lining by makeup is omitted. Then, as shown in FIG. 1, for internal work, a beam material 2 made of steel shaped steel is installed in the width direction in the shield tunnel, this is used as a sleeper, a rail 14 is installed thereon, and a work cart 15 Will be running. In this case, since the inner surface 1a of the shield tunnel 1 is a circular arc surface and is formed by a concrete segment, the end edge 2a of the beam member 2 abuts linearly, and a concentrated load is applied thereto. There is a risk of damaging the inner surface 1a of the concrete segment.
[0003]
Therefore, in the conventional installation work of the beam material 2 for the sleepers, when the beam material 2 is lowered to a predetermined position in the tunnel by a crane, the protective sheet 13 made of rubber or synthetic resin is attached to the tunnel inner surface 1a by an operator. It is sandwiched between the edge 2a of the beam member 2.
[0004]
[Problems to be solved by the invention]
However, since the work of sandwiching the protective sheet by the worker at the site must be performed in parallel with the positioning work for lowering the beam material, the work is troublesome, and between the beam material and the tunnel inner surface. In addition, there is a danger such as a worker's hand being caught. In addition, there is a strong possibility that the protective sheet will be broken by the load of the beam material.
[0005]
The present invention has been made based on the above circumstances, and by placing a protective member in advance on the end of the beam material, it is possible to omit the on-site pinching work and ensure the safety of workers. In addition, an object of the present invention is to provide a protective structure that protects the workability and further prevents the protective member from being damaged during use, and a protective member as a protector used in the protective structure.
[0006]
[Means for Solving the Problems]
For this reason, in the invention of claim 1, as has been clarified in the illustrated embodiment, the beam material 2 made of a section steel (same as H-section steel or I-section steel) is installed in the shield tunnel 1 in the width direction. from a protective structure for protecting the inner surface 1a of the shield tunnel 1, pieces of edge 2a impinging on at least the said inner surface of the shield tunnel 1 of the beam member 2 (the lower piece 2b, or lower piece 2b and the upper piece c) In addition, in the protection structure of the inner surface of the shield tunnel in which the protective member 3 having a substantially U-shaped fitting groove 3a is fitted and held , the protective member is formed of a hard synthetic resin having impact resistance and elasticity. As a result, the opening edge of the fitting groove is inclined and reduced inward in a natural state, and the opening edge is elastically expanded to fit the end piece of the beam material. Underside of the outer wall surface The corners protruding wall portion of the wall thickness in contact with the inner surface of the shield tunnel is characterized in that it is formed integrally projects. The invention of claim 6 relates to the protective member 3 used in the protective structure.
[0007]
In such a configuration, since the protection member 3 is fitted in advance to the edge 2a of the beam member 2, in the field work, work such as laying (pinching) the protection sheet is omitted. The safety of workers can be ensured.
[0008]
Moreover, in such a structure, since the gravity center of the edge part 2a of the beam material 2 is received by the thick jetty part 3b of the protection member 3, there is no breakage of the protection member 3, and a protection function improves.
[0009]
It is desirable that the protective member is made of hard enviroment or hard ABS resin.
[0010]
In the inventions of claims 3 and 8, the protective member 3 has a generally U-shaped cross section as a whole, and is fitted and held on at least a piece of the edge portion 2a corresponding to the inner surface of the shield tunnel of the beam member 2. A cut groove portion 3c into which the intermediate piece of the beam member 2 is inserted is formed in an intermediate portion between the upper and lower pieces.
[0011]
In such a configuration, the protection member 3 can be easily attached to the end edge portion 2a of the beam member 2, the protection function is improved, and the displacement of the protection member 3 after the attachment is small.
[0012]
In the invention of claim 4, an insertion member 4 having a generally U-shaped cross section made of a thin plate of metal or hard synthetic resin is fitted and held on the piece of the edge 2 a of the beam member 2, and the outer surface of the insertion member 4 From the above, the protective member 3 is fitted and held.
[0013]
In such a configuration, even when there is a burr at the time of fusing at the edge 2 of the beam member 2, the burr is covered by the insertion member 4, and the rubber-like protective member 3 is cut by the burr and damaged. There is nothing to do.
[0014]
In the invention of claim 5, when the intermediate portion of the beam member 2 is supported on the bottom inner surface 1a of the shield tunnel by the support column 5 made of the same steel material as the beam member 2, at least the shield tunnel of the support column 5 It is characterized in that a supporting column protection member 6 having a fitting groove having a substantially U-shaped cross section having the same shape as that of the protection member 3 is fitted and held on a piece of an edge portion corresponding to the inner surface of the support member.
[0015]
In such a configuration, the bottom inner surface 1a of the shield tunnel is not damaged by the lower end of the support pillar 5.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the protection structure for the inner surface of the shield tunnel of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an overall schematic front view showing an embodiment of a protective structure of the present invention. As shown in FIG. 1, a beam member 2 made of steel bar is installed in the width direction between the upper and lower sides of the inner surface 1a of the shield tunnel 1 formed by the shield method, and a rail 14 is installed in the longitudinal direction using this as a sleeper. Then, the work cart 15 is configured to travel. The inner surface 1a of the shield tunnel 1 is formed by the inner surface of the concrete segment. A protective member 3 serving as an elastic and flexible protector is fitted to a piece of the end edge 2a of the beam 2 that contacts the inner surface 1a of the shield tunnel 1. The protective member 3 is formed of rubber or synthetic resin, and can be formed of, for example, vinyl chloride resin, ABS resin, polyamide resin, polypropylene resin, elastomer, or white rubber compounded with silica. The protective member 3 is substantially U-shaped in cross section, and is formed with a substantially U-shaped fitting groove 3a. The fitting of the protective member 3 is carried out by using an adhesive in addition to the elastic fitting of the protective member 3. can do.
[0017]
2 and 3 show the protective member 3 (3-1) according to the first embodiment. This protective member 3 (3-1) has a generally U-shaped cross section as a whole, and is fitted with a piece (lower piece 2b or lower piece 2b and upper piece 2c) of the end edge 2a of the beam member 2. It has a fitting groove 3a having a shape. In the embodiment of FIG. 3, the edge 2a of the beam member 2 is cut vertically, and protective members 3 (3-1) are fitted to the left and right of the intermediate piece 2d in the lower piece 2b, respectively. When the edge 2a of the beam member 2 is cut obliquely along the curve of the inner surface 1a of the shield tunnel 1, the upper and lower pieces may come into contact with the inner surface 1a. 3 (3-1) is fitted. Moreover, it is desirable to form thickly the lower piece part which hits the inner surface 1a of the shield tunnel 1 of the protection member 3 (3-1), especially the lower corner part of the outer wall surface.
[0018]
4 and 5 show the protective member 3 (3-2) according to the second embodiment. The protective member 3 (3-2) has a semicircular or inverted triangular jetty 3b formed at the lower corner of the outer wall surface. The center of gravity of the edge portion 2a of the beam member 2 is received by the jetty portion 3b, and the contact with the inner surface 1a of the shield tunnel 1 is buffered. In the embodiment of FIG. 5, the edge 2a of the beam member 2 is obliquely cut substantially along the curve of the inner surface 1a of the shield tunnel 1, and the protective member 3 (3-2) is fitted to the upper and lower pieces, respectively. It is worn.
[0019]
FIG. 6 shows a protective member 3 (3-3) according to the third embodiment. The protective member 3 (3-3) is formed of a hard resin having impact resistance and elasticity, for example, hard enviroment or hard ABS, and has a generally U-shaped cross section as a whole, and an opening edge of the fitting groove 3a. Is elastically expanded to be fitted and held on a piece of the end edge 2a of the beam member 2. Therefore, in the natural state, the opening edge of the fitting groove 3a is inclined and reduced inward as shown in FIG. 6 (a), and is fitted into the piece of the beam member 2 as shown in FIG. 6 (b). The diameter is elastically expanded. The opening edge of the fitting groove 3a is a guide edge 3d widened upward or downward in the diameter increasing direction, so that the beam member 2 can be easily inserted into the piece. A jetty portion 3b in contact with the inner surface 1a of the shield tunnel 1 is integrally formed at the lower corner portion of the outer wall surface of the protection member 3 (3-3). The jetty portion 3b has a substantially inverted triangular shape, and a cavity for stealing meat is formed inside.
[0020]
FIG. 7 shows a protective member 3 (3-4) according to the fourth embodiment. In this protective member 3 (3-4), a solid triangular jetty portion 3b that is in contact with the inner surface 1a of the shield tunnel 1 is integrally formed at the lower corner portion of the outer wall surface.
[0021]
FIG. 8 shows a protective member 3 (3-5) according to the fifth embodiment. In this protective member 3 (3-4), a ridge portion 3b having a fin shape in cross section that is in contact with the inner surface 1a of the shield tunnel 1 is integrally formed to project downward in the lower corner portion of the outer wall surface.
[0022]
FIG. 9 shows a protective member 3 (3-6) according to the sixth embodiment. In the protective member 3 (3-6), a cut groove portion 3c into which the intermediate piece 2d of the beam member 2 is inserted is formed in the middle portion of the substantially U-shaped upper or lower piece. The protection member 3 (3-6) is fitted to the beam member 2 such that the kerf portion 3c is fitted into the intermediate piece 2d of the beam member 2.
[0023]
FIG. 10 shows a seventh embodiment. In this embodiment, a substantially U-shaped insertion member 4 made of a thin plate of metal or hard synthetic resin is fitted and held on a piece of the end edge 2 a of the beam member 2, and from the outer surface of the insertion member 4. The protective member 3 (3-1 to 6) is fitted and held. The insertion member 4 is preferably formed of a thin metal plate having elasticity such as stainless steel. In such a configuration, even when there is a burr at the time of fusing at the edge 2 of the beam member 2, the burr is covered by the insertion member 4, and the rubber-like protective member 3 is cut by the burr and damaged. There is nothing to do.
[0024]
FIG. 11 shows an eighth embodiment. In this embodiment, the intermediate portion of the beam member 2 is supported on the bottom inner surface 1a of the shield tunnel by the support column 5 made of the same steel material as the beam member 2. The support pillars 5 may be formed at one place in the middle part of the beam member 2 or may be formed at a plurality of places such as two places. A supporting column protection member 6 having a substantially U-shaped fitting groove having the same shape as that of the protection member 3 (3-1 to 6) is fitted to the lower edge portion of the supporting column 5. Is retained. In such a configuration, the bottom inner surface 1a of the shield tunnel is not damaged by the lower end of the support pillar 5.
[0025]
【The invention's effect】
The present invention has been described in detail above, in order to protect the inner surface of the shield tunnel from the beam material for sleepers during construction in the shield tunnel, the edge of the beam material is previously made of rubber, synthesized Since an elastic and flexible protective member such as resin is fitted, work such as laying (pinching) the protective sheet is omitted in the field work, improving workability and worker safety. Can also be secured. Further, the protective member is fitted through a fitting groove having a substantially U-shaped cross section, and is structurally robust and does not break.
[Brief description of the drawings]
FIG. 1 is an overall schematic front view showing an embodiment of a protective structure of the present invention.
FIG. 2 is a cross-sectional view showing a first embodiment of a protective member of the present invention.
FIG. 3 is a cross-sectional view showing a mounting state of the protection member according to the first embodiment.
FIG. 4 is a cross-sectional view showing a second embodiment of the protective member of the present invention.
FIG. 5 is a cross-sectional view showing a mounting state of the protective member according to the second embodiment.
FIG. 6 is a cross-sectional view showing a third embodiment of the protective member of the present invention.
FIG. 7 is a cross-sectional view showing a fourth embodiment of the protective member of the present invention.
FIG. 8 is a sectional view showing a fifth embodiment of a protective member of the present invention.
FIG. 9 is a cross-sectional view showing a sixth embodiment of the protective member of the present invention.
FIG. 10 is a cross-sectional view showing a seventh embodiment of the present invention.
FIG. 11 is a sectional view showing an eighth embodiment of the present invention.
FIG. 12 is an overall schematic front view of a conventional protective structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield tunnel 1a Inner surface 2 Beam material 2a End edge part 2b Lower piece 2c Upper piece 2d Intermediate piece 3 Protection member 3a Fitting groove 3b Groove 3c Cut groove part 3d Guide edge 4 Insertion member 5 Support pillar 6 Protection member for support pillar 14 rail 15 work trolley

Claims (8)

A protective structure for protecting the inner surface of the shield tunnel from a beam material made of steel material installed in the width direction in the shield tunnel , wherein at least a piece of the edge portion of the beam material corresponding to the inner surface of the shield tunnel has a substantially cross-sectional shape. In the protective structure of the inner surface of the shield tunnel in which a protective member having a shape fitting groove is fitted and held ,
The protective member is formed of a hard synthetic resin having impact resistance and elasticity, and has a substantially cross-sectional U shape as a whole, and the opening edge of the fitting groove is inclined and reduced inward in a natural state, and the opening The edge is elastically expanded to be fitted and held to the end edge piece of the beam material, and a thick jetty in contact with the inner surface of the shield tunnel is provided at the lower corner of the outer wall surface. A protective structure for the inner surface of a shield tunnel, characterized by being integrally formed to protrude. The protection structure for the inner surface of the shield tunnel according to claim 1, wherein the protection member is made of hard enviroment or hard ABS resin . The protective member has a generally U-shaped cross section as a whole, and is fitted and held to at least a piece of an edge portion corresponding to the inner surface of the shield tunnel of the beam material. The protective structure for the inner surface of the shield tunnel according to claim 1, wherein a cut groove portion into which an intermediate piece of a beam material made of steel is inserted is formed. An insertion member having an approximately U-shaped cross section made of a thin plate of metal or hard synthetic resin is fitted and held on a piece of an edge portion corresponding to the inner surface of the shield tunnel of the beam material, and the protection from the outer surface of the insertion member The protection structure for the inner surface of the shield tunnel according to claim 1, 2, or 3, wherein the members are fitted and held. The beam material is supported on the bottom of the shield tunnel by a support column made of a steel material similar to the beam material at the bottom of the beam material, and at least a piece of an edge portion corresponding to the inner surface of the shield tunnel of the support column The protection structure for the inner surface of the shield tunnel according to any one of claims 1 to 4, wherein a protection member having a fitting groove having a substantially U-shaped cross section is fitted and held. In the protective member used for the protection structure of the shield tunnel inner surface of any one of Claims 1 thru | or 4,
It is made of hard synthetic resin with impact resistance and elasticity, and has a generally U-shaped cross section as a whole, and the opening edge of the fitting groove is inclined and reduced inward in a natural state, and the opening edge is elastically formed. It is possible to fit and hold to a piece of the edge portion of the beam material by spreading it, and a jetty portion in contact with the inner surface of the shield tunnel is integrally formed at the lower corner portion of the outer wall surface. A protective member for the inner surface of the shield tunnel. The protective member for the inner surface of the shield tunnel according to claim 6, wherein the protective member is formed of a hard resin or a hard ABS resin . 8. The shield tunnel according to claim 6 or 7, wherein the shield tunnel as a whole has a substantially U-shaped cross section, and a kerf portion opened at an edge portion of the upper or lower piece is formed at an intermediate portion of the upper or lower piece. Protective member for the inner surface.

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