JP3764984B2 - Fireproof structure in shield tunnel lining - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fireproof structure in shield tunnel lining.
[0002]
[Prior art]
The secondary lining of the shield tunnel constructed on the inner circumference of the segment assembled in an annular shape plays the role of meandering correction, finishing, waterproofing, etc. However, for example, when there is a possibility that a mine fire may occur after operation, such as a road tunnel, the secondary lining is a heat insulating material that prevents the high-temperature heat generated by the mine fire from damaging the segment. Also plays a role.
[0003]
Although the role of secondary lining described above has been reduced due to recent improvements in shield tunneling technology, it still exists as a fireproof structure.
[0004]
However, the conventional fireproof structure using the secondary lining has the technical problems described below.
[0005]
[Problems to be solved by the invention]
In other words, when secondary lining is used for fireproof structures, after constructing the primary lining in the segment, the secondary lining made of concrete is constructed on the inner surface side of the segment. This increases the cost.
[0006]
In addition, secondary lining is usually performed on site, so it is difficult to improve workability and process, and it is difficult to shorten the construction period.
[0007]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a fireproof structure in shield tunnel lining that can simultaneously achieve cost reduction and shortening of construction period. Is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention covers the inner peripheral surface of the lining segment of the shield tunnel assembled in a cylindrical shape, and attaches a fireproof panel having heat insulation such as ceramics , A space serving as both a heat insulation and a drainage passage was provided between the fireproof panel and the segment, and the heat insulation space was filled with an inorganic fiber material such as rock wool fixed in advance on the back side of the fireproof panel .
According to the fireproof structure in the shield tunnel lining constructed as described above, the fireproof panel having heat insulation such as ceramics is superior in heat insulation than the secondary lining concrete, so that its thickness can be reduced. As a result, the cross-sectional area of the tunnel to be constructed can be reduced.
Insulating fireproof panels made of ceramics, which are the main component of the fireproof structure, can be produced in the factory in advance, and the fireproof panels produced in the factory are brought into the construction site and attached along the inner periphery of the segment. Since a fireproof structure can be obtained by installing, workability and process can be easily improved, and the construction period can be shortened.
In the fireproof structure in the shield tunnel lining according to the present invention, since the space for heat insulation and drainage passage is provided between the fireproof panel and the segment, the function of the heat insulation or drainage passage space is ensured even in a very thin layer. It is possible to further increase the heat insulation of the refractory structure, and the thickness of the entire refractory structure can be significantly reduced.
The heat insulating space is filled with an inorganic fiber material fixed in advance on the back side of the fireproof panel, so that a space of a predetermined thickness can be reliably ensured without impairing heat insulating properties and drainage function, Further, the entry of foreign matter into the space can be prevented by the inorganic fiber material, and the heat insulation or drainage function can be maintained for a long time.
[0009]
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. 1 to 9 show an embodiment of a fireproof structure in a shield tunnel lining according to the present invention.
[0010]
As shown in FIG. 1, the fireproof structure 10 shown in FIG. 1 has an inner surface on the upper side except for the invert part along the inner peripheral surface of the segment 12 assembled in a cylindrical shape. Built to cover.
[0011]
In the case of the present embodiment, the segment 12 is of the RC structure, and a plurality of segment pieces curved in an arc shape are arranged adjacent to each other in the circumferential and axial directions to connect the joints to each other. It is assembled in a cylindrical shape.
[0012]
The segments 12 are sequentially installed at the rear side of the shield machine, not shown. The fireproof structure 10 of the present embodiment has a fireproof panel 14 and an inner peripheral surface of the segment 12 and an outer periphery of the fireproof panel 14 when the fireproof panel 14 is installed as shown in FIG. And a space 16 that serves as a heat insulating and drainage passage defined by the surface.
[0013]
Such a refractory structure 10 is installed by parallel work at a distance from the face after the primary lining is completed by the segment 12. The refractory panel 14 is formed in a thin plate shape from a material having a higher heat insulating property than the secondary lining concrete, such as ceramics having a thickness of about 25 mm. In the case of this embodiment, the refractory panel 14 is used for the primary lining. The segment 12 has a relatively small-diameter segment having a larger number of circumferential and axial divisions than the segment 12.
[0014]
In the case of the present embodiment, an inorganic fiber material 18 such as rock wool is fixed on the back side of each fireproof panel 14 with a uniform thickness, for example, a thickness of about 10 mm over the entire surface. .
[0015]
When the fireproof panel 14 is installed, the inorganic fiber material 18 is filled in a space 16 that serves as a heat insulation and drainage passage defined by the inner peripheral surface of the segment 12 and the outer peripheral surface of the fireproof panel 14.
[0016]
As shown in detail in FIG. 2, the mounting structure of the fireproof panel 14 is made of ceramic insert nut 20 embedded in the segment 12 and a stud screwed to the insert nut 20 in this embodiment. A bolt 22 and a fireproof cap 24 screwed to the stud bolt 22 are provided.
[0017]
Each fireproof panel 14 is provided with a stepped through hole 26 for attachment at a predetermined position. A sintered metal sleeve 28 is fixed inside the stepped through hole 26, and a fireproof cap 24 is screwed to the distal end of the sleeve 28 with the stud bolt 22 inserted therethrough.
[0018]
A fireproof joint material 30 is filled in the stepped through hole 26 to which the fireproof cap 24 is screwed. Further, on the outer peripheral edge of each refractory panel 14, when a plurality of these are adjacently arranged along the circumference and the axial direction, a stepped portion 32 having an overlapped structure is provided that overlaps with the adjacent peripheral edges. .
[0019]
The fireproof panel 14 configured as described above is manufactured in advance by factory production and is carried to the construction site. The details of the procedure for attaching the fireproof panel 14 that has been carried in to the segment 12 are shown in FIGS.
[0020]
When attaching the refractory panel 14 to the inner peripheral surface of the segment 12, first, as shown in FIG. 3, the ceramics are attached to the segment 12 at locations corresponding to the stepped through holes 22 provided in each refractory panel 14. An insert nut 20 made of steel is embedded and a stud bolt 22 is screwed to each embedded insert nut 20.
[0021]
Next, as shown in FIG. 4, the fireproof panel 14 is arranged so that the stud bolt 22 passes through the sleeve 28. At this time, the filter material 18 fixed on the back side of the fireproof panel 14 is positioned so that it contacts the inner surface of the segment 12.
[0022]
After that, as shown in FIG. 5, the fireproof cap 24 is screwed into the tip of the stud bolt 22 to fix the fireproof panel 14, and then the joint material 30 is filled into the stepped through hole 26.
[0023]
When one refractory panel 14 is attached in this way, as shown in FIG. 6, another refractory panel 14 is attached adjacent to the side thereof. At this time, in the case of the present embodiment, the stepped portions 32 having the overlapping structure are provided on the outer peripheral edge of each refractory panel 14, and therefore the stepped portions 32 are mutually connected as shown in FIGS. So that there is no gap at the joint.
[0024]
If the joints between the fireproof panels 14 have such a pegging structure, even if a slight gap occurs between the fireproof panels 14 due to construction errors, etc., there are stepped portions 32 that contact each other. Predetermined fire resistance can be ensured.
[0025]
When another fireproof panel 14 is installed in this way, as shown in FIG. 7, the fireproof cap 24 is screwed in and the joint material 30 is filled and fixed as in the case of the fireproof panel 14.
[0026]
Now, according to the fireproof structure 10 configured as described above, a thin heat-insulating fireproof panel 14 made of ceramics or the like covered along the inner peripheral surface of the segment 12 assembled in a cylindrical shape, and the segment 12. And a space 16 also used as a heat insulation and drainage passage formed between the fireproof panel 14 and the heat insulation or drainage passage space 16 to ensure its function even in a very thin layer, for example, a gap of about 10 mm. Therefore, compared to a concrete secondary lining (generally about 350mm is required), the overall thickness of the fireproof structure can be significantly reduced. The cross-sectional area can be reduced, and the cost can be reduced.
[0027]
Moreover, the thin fireproof panel 14 made of ceramics or the like which is the main body of the fireproof structure 10 can be produced in advance in the factory, and the fireproof panel 14 produced in the factory is brought into the construction site, and a predetermined amount is placed on the inner periphery of the segment 12. Since the fireproof structure 10 is obtained by installing the space 16 apart, the workability and the process can be easily improved, and the construction period can be shortened.
[0028]
Furthermore, in the case of the present embodiment, the heat insulating space 16 is filled with the inorganic fiber material 18 fixed in advance on the back side of the fireproof panel 14, so that the heat insulating property and the drainage function are not hindered. The space 16 having a predetermined thickness can be reliably ensured, and the inorganic fiber material 18 prevents foreign matter from entering the space 16, so that the heat insulation or drainage function of the space 16 can be maintained for a long period of time. it can.
[0029]
In addition, in the said Example, after completing the primary lining by the segment 12, although illustrated the method of installing the fireproof panel 14 by parallel work at a distance from the face, implementation of this invention is limited to this. For example, a method may be used in which the fireproof panel 14 is attached to the segment 12 and the segment 12 is assembled and then the joint of the segment is filled with a fireproof material.
[0031]
【The invention's effect】
As described above in detail, according to the fireproof structure in the shield tunnel lining according to the present invention, it is possible to simultaneously achieve cost reduction and shortening of the construction period.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a tunnel showing an embodiment of a fireproof structure in a shield tunnel lining according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a cross-sectional explanatory view at the initial stage of construction when the fireproof structure shown in FIG. 1 is constructed.
4 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 3. FIG.
FIG. 5 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 4;
6 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 5. FIG.
7 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 6. FIG.
FIG. 8 is an enlarged explanatory diagram of FIG. 6;
FIG. 9 is an enlarged explanatory view of FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Fireproof structure 12 Segment 14 Fireproof panel 16 Space 18 Inorganic fiber material 20 Insert nut 22 Stud bolt 24 Fireproof cap

Claims (1)

Covering the inner peripheral surface of the lining segment of the shield tunnel assembled in a cylindrical shape, a fireproof panel having a heat insulating property such as ceramics is attached , and heat insulation and drainage are provided between the fireproof panel and the segment. A fireproof structure in shield tunnel lining , wherein a space also serving as a passage is provided, and the heat insulation space is filled with an inorganic fiber material such as rock wool fixed in advance on the back side of the fireproof panel .

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