JP2000008789A - Shield tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability with high water stop performance while improving work execution efficiency, shortening a construction period and reducing cost. SOLUTION: Waterproof panels 5 made of resin and fitted by panel fitting means are connected on the inner surface 2a side of cylindrical primary covering 3 formed by jointing a large number of segments 2, while ensuring water stop performance. Secondary covering 4 covering the inner surface of the primary covering 3 is therefore constructed to ensure watertightness. A filler is further filled between the primary covering 3 and secondary covering 4 to form a filler layer 6, so that positive, water stop performance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel constructed along an axial direction of a borehole, and more particularly to a shield tunnel having watertightness.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a so-called shield method is generally used in which a cylindrical wall (shield tunnel) is constructed by assembling segments (mainly made of concrete or steel) on the inner surface side of an excavation hole. It is. As the segments used in the shield method, those having a rectangular shape in a plan view and an arc plate shape are mainly used, and these segments are joined together by bolts. As a structure for joining the segments with the bolts, joints having holes communicating with each other when the joining surfaces of the segments are brought into contact with each other are buried in the vicinity of the joining surfaces of the segments. In general, a structure is used in which a bolt is inserted into a hole and a nut is fastened to the bolt, so that the joining surfaces of the segments are in contact with each other so that the portions communicate with each other. Further, there is also a structure in which an insert fitting as a nut member is embedded in each segment, and bolts penetrating adjacent segments are fastened to each other for joining.

[0003] In a shield tunnel used as a headrace pipe such as an underground river or a sewer pipe, a secondary lining is constructed on the inner surface of a segment which is a primary lining material.
It is necessary to prevent corrosion of the primary lining. As the secondary lining, cast concrete, resin spray coating, or the like is employed. The secondary lining with cast concrete is 150m on the inner surface of the cylindrical wall which is composed of many segments.
Cast concrete with a thickness of m to 300 mm. This prevents internal water from penetrating into the primary lining and corroding the segment body and fittings,
By embedding the gap between the segments, the watertightness of the shield tunnel can be improved. Also, on the inner surface of the segment,
A bolt box, which is a recess for fastening the fastening bolts between the segments, is formed, but is buried by placing secondary lining concrete or pouring mortar to obtain a smooth inner surface. Obtaining a smooth inner surface by embedding the bolt box is the same for the secondary lining by resin coating.

[0004]

However, as described above, the secondary lining of a shield tunnel used as a water conduit requires a lot of time and labor for construction, which causes an increase in cost and an extension of the construction period. Had occurred. That is, the secondary lining with cast concrete requires the installation and removal of a concrete casting formwork, which significantly increases the number of steps and the cost. Further, in order to reliably protect the primary lining from corrosion over a long period of time, it is necessary to apply the secondary lining concrete to a thickness of 150 mm to 300 mm, and the usable internal space is narrowed, and the water transmission pipe is reduced. When used as a road, water flow is limited. On the other hand, in the spray coating of resin, there is a problem that it takes time and effort to bury a bolt box, and a smooth (smooth) inner surface cannot be easily obtained. If a smooth inner surface cannot be obtained in the shield tunnel, the flow path resistance at the time of flowing water will be greatly increased, and the problem that the performance as a pipeline will be greatly reduced will occur. However, when the burial work is performed individually for each bolt box, the number of man-hours is enormous, the construction efficiency is greatly reduced, and the construction period is prolonged.
Steps and the like generated between adjacent segments constituting the primary lining are also obstacles for obtaining a smooth inner surface, and in order to solve this, as much work as a bolt box was required. In addition, since the resin coating itself requires an additional base treatment for improving the adhesiveness, and it is difficult to improve the construction efficiency, it takes a long time to perform the construction, and furthermore, it requires sufficient ventilation. This is a work, and there is a problem that it is difficult for the worker. Regardless of the concrete lining or resin coating secondary lining, smoothing the inner surface of the shield tunnel at the bent part of the shield tunnel is a laborious work, further increasing the man-hour and increasing the cost, This causes an increase in the flow path resistance. As described above, in a shield tunnel used as a water conduit, it has been required to develop a technology that enables cost reduction, shortening of a construction period, and the like, and that easily achieves high waterproofness and corrosion resistance. .

The present invention has been made in view of the above-mentioned problems, and has high waterproofness by using a resin waterproof panel.
Corrosion resistance and, if necessary, wear resistance can be obtained at low cost.
Moreover, an object of the present invention is to provide a shield tunnel that can be easily constructed and can greatly improve construction efficiency.

[0006]

According to the first aspect of the present invention, there is provided a shield tunnel constructed by joining a large number of segments in a state where their joining end surfaces are joined to each other and forming a cylindrical shape. The resin-made waterproof panel attached to the inner surface side of the primary lining is waterproofed by the cylindrical primary lining formed by joining and the panel attaching means provided on the inner surface side of the segment constituting the primary lining. The primary lining and the secondary lining are connected through a secondary lining for lining the inner surface of the primary lining, and a filling material injection hole formed in the waterproof panel. And a filler layer formed by injecting and filling a filler into a clearance interposed between the shield tunnel and the shield tunnel. According to a second aspect of the present invention, in the shield tunnel according to the first aspect, the clearance is secured by abutting a spacer projection protruding from the waterproof panel to the primary lining. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a shield tunnel 1 of the present embodiment, and FIG. 2 is a cross-sectional view of the shield tunnel 1 as viewed from an axial direction. 1 and 2, a shield tunnel 1 is composed of a primary lining 3 formed by joining segments 2 formed in a circular arc shape from concrete in a tunnel axial direction and a circumferential direction and assembling them into a circular cylindrical shape. And a secondary lining 4 for lining the inner surface of the primary lining 3 in a watertight manner.

The secondary lining 4 is constructed by connecting a resin waterproof panel 5 attached to the inner surface of the primary lining 3 in a tunnel axial direction and a circumferential direction while securing water stoppage by a caulking material (not shown). It is watertight as a whole. At the bottom of the shield tunnel 1, an invert 1a formed by casting concrete on the primary lining 3 is provided.
The secondary lining 4 covers the inner surface of the primary lining 3 other than the invert 1a. Therefore, the secondary lining 4 has a C-shaped cross section that covers the entire inner surface of the primary lining 3 avoiding the invert 1a. The panel fixing portions 1b provided on both sides of the invert 1a fix the lower end of the waterproof panel 5 located at the lower end of the secondary lining 4.

In FIGS. 1 and 2, the size of the waterproof panel 5 in the circumferential direction is about two pieces of the segment 2, and the axial dimension is also about two pieces of the segment 2. However, the present invention is not limited to this. For example, it is also possible to make the circumferential dimension the same as the circumferential dimension of the secondary lining 4 to be constructed, and to omit the continuous arrangement in the circumferential direction. If a large number of waterproof panels are used and the number of continuous installations is reduced, the number of locations where water is to be stopped is reduced, construction efficiency is improved, and high waterproofness is more reliably obtained.

Between the primary lining 3 and the secondary lining 4, a filler layer 6 made of a mortar or other water-blocking filler is formed. As shown in FIG.
And the secondary lining 4 are separated from each other, and the filler layer 6
Is formed by injecting and filling a filler into a clearance 7 between the primary lining 3 and the secondary lining 4 from a filler injection hole 5 a formed in the waterproof panel 5, and curing the same. . This filler is also filled and embedded in a bolt box 2b formed on the inner surface 2a of the segment 2 as a working recess when joining and fixing the segments 2 in the axial direction and the circumferential direction with bolts. .

As shown in FIG. 1, the waterproof panel 5 is formed of a resin such as plastic into a curved plate having a thickness of about 50 mm, and is curved along the inner surface of the primary lining 3. Spacer projections 8 are provided at a plurality of locations on the outer surface side. As shown in FIG. 4, the waterproof panel 5 has a screw 9 inserted from the inner surface thereof into a mounting hole 5b penetrating the spacer protrusion 8 and embedded and fixed to the inner surface 2a side of the segment 2. It is screwed into the insert part 10 as an attachment means and attached. At this time, as shown in FIG. 2, the waterproof panel 5 is separated from the segment 2 by the target distance by the spacer projection 8 abutting on the inner surface 2a of the segment.
Is formed. Therefore, the waterproof panel 5 is replaced with the primary lining 3
When the clearance 7 is filled with a filler after being attached to the inner surface, a filler layer 6 having a substantially desired thickness is formed.

Next, in order to construct the shield tunnel 1, first, the primary lining 3 is assembled while joining the segments 2 in the axial and circumferential directions, and then the waterproof panel 5 is placed inside the primary lining 3. The secondary lining 4 is installed by connecting the pipes in the axial direction and the circumferential direction of the tunnel while securing the waterproofness. The waterproofness between the waterproof panels 5 adjacent in the axial direction and the circumferential direction is ensured by a caulking material or the like, whereby the water-tight secondary lining 4 is obtained. Here, the construction of the secondary lining 4 may be performed after the construction of the entire primary lining 3 is completed. However, as the ring body obtained by assembling the segments 2 in the circumferential direction is assembled, waterproofing is sequentially performed. It is also possible to attach the panels 5 and perform them in parallel.

When the secondary lining 4 is completed, a filler filling hole 5a is formed in a plurality of places of the waterproof panel 5 so that the inside of the clearance 7 secured between the primary lining 3 and the secondary lining 4 is formed. Then, a filler such as mortar is injected from the filler injection hole 5a.
Filling is performed to form a filler layer 6 (see FIG. 3). Thereby, the shield tunnel 1 is completed. In FIG. 3, the filler filling hole 5a is formed at a position corresponding to the bolt box 2b. However, the present invention is not limited to this. According to the filling position of the filler, such as the joining position between the two,
It can be set appropriately. The filler is filled with no gap in the entire space between the primary lining 3 and the secondary lining 4 using the waterproof panel 5 as a mold, and therefore enters the bolt box 2b and the like evenly. For this reason, high waterproofness is obtained in the shield tunnel 1, water is prevented from entering the primary lining 3 from the inside of the secondary lining 4, corrosion of the primary lining 3 is prevented, and high durability is obtained.

When the segments 2 joined in the circumferential direction are located on the same circumference and a smooth inner surface is obtained in the primary lining 3, the filler 7 is injected into the clearance 7.
Although the filler layer 6 having a substantially constant thickness is formed, even when a displacement occurs between the segments 2 or a step occurs due to a difference in size or a change in the joining direction,
When the filler injected and filled into the clearance 7 spreads, the filler layer 6 can be constructed without any trouble, and the waterproofness can be ensured. Note that the waterproof panel is not limited to the configuration in which the filler injection hole 5a is drilled after being attached to the inner surface of the primary lining 3, and a panel in which the filler injection hole is drilled in advance can also be used. is there.

The shield tunnel 1 has a waterproof panel 5
The secondary lining 4, which is provided continuously in the axial direction and the circumferential direction, exhibits high watertightness while securing water-stopping properties, so that even when used as a water conduit, corrosion of the primary lining 3 can be prevented. , High durability is obtained. Moreover, since the space between the primary lining 3 and the secondary lining 4 is filled with a filler having a water-stopping property, a high water-stopping property is reliably obtained regardless of the shape of the inner surface of the primary lining 3 and at the same time. , And a smooth inner surface can be obtained. When a smooth inner surface is obtained by the secondary lining 4 in which the waterproof panels 5 are connected in series, when used as a water conduit, the flow resistance at the time of water flow can be reduced, and a large flow rate of water can be obtained. Is possible.

By adjusting the shape of the waterproof panel 5, the shape of the spacer projection 8, the amount of protrusion, and the like, a smooth inner surface can be easily obtained as a whole corresponding to the bent portion of the shield tunnel 1. Even with the shield tunnel 1 having a portion, high water conduction performance can be obtained. For example, a smooth inner surface can be easily obtained (e.g., curved) by the shape and the like of the waterproof panel located at the bent portion, and it is possible to cope with only the waterproof panel. Therefore, a secondary lining made of cast concrete is constructed. As compared with the conventional example, the cost can be reduced and the workability can be improved. Further, as another bending countermeasure, in addition to the countermeasure based on the shape of the waterproof panel, the amount of protrusion of the spacer protrusion 8 from the waterproof panel, the tip shape contacting the inner surface of the primary lining 3, and the like are adjusted. It is also possible to obtain a desired inclination angle with respect to the primary lining 3. Further, if the waterproof panel has a mounting hole into which the screw 9 can be screwed, a desired inclination angle with respect to the primary lining 3 can be obtained by adjusting the screwing position of the screw 9 with respect to the mounting hole. Further, the secondary lining 4 can be easily constructed simply by attaching the waterproof panel 5 to the inner surface of the primary lining 3 using the panel attaching means (specifically, the insert part 10). The construction is easier than conventional concrete casting, resin coating, and the like, so that the construction period can be shortened and the cost can be reduced.

The segment of the present invention is not limited to the above embodiment, but can be variously modified. For example, as the joining structure for joining the segments in the axial direction and the circumferential direction, various structures such as a structure using joint parts, a structure in which the segments are fitted to each other by a fitting joint formed on the joining end surface of the segments, and the like can be adopted. is there. The segments are not limited to those made of concrete, and for example, steel segments made of a steel frame, a steel plate, or the like can be used. Various configurations such as a trapezoidal plate shape and a hexagonal plate shape can be adopted as the shape of the segment. The panel mounting means for mounting the waterproof panel is not limited to the above-mentioned insert fittings, for example,
Various configurations such as a fitting hole into which an elastic claw projecting from the waterproof panel is fitted can be adopted.

[0018]

As described above, according to the shield tunnel of the first aspect, the inner surface side of the cylindrical primary lining formed by joining a large number of segments is provided with a resin waterproof panel to secure the waterproofness. Lining with a secondary lining that is continuously installed,
Since high waterproofness is obtained by the secondary lining, corrosion and the like of the primary lining are prevented, and durability is improved. Further, the shield tunnel is formed by injecting and filling a filler into a clearance interposed between the primary lining and the secondary lining through a filler injection hole formed in the waterproof panel. It has a filler layer. Since this filler layer is formed by filling and injecting the filler, it is filled without gaps between the primary lining and the secondary lining, and high waterproofness can be reliably obtained. Since the secondary lining is installed by attaching the waterproof panel using the panel attaching means provided on the inner surface side of the primary lining segment, compared to the conventional concrete casting, resin coating, etc. Construction is easy and the construction period can be shortened. In addition, since the filler layer is injected and filled with the secondary lining as a mold, it can be applied regardless of the unevenness of the inner surface of the primary lining, high workability is obtained, and excellent effects such as shortening the construction period are obtained. Play.

According to the second aspect of the present invention, the clearance is ensured by contacting the spacer projection projecting from the waterproof panel with the primary lining, so that the primary lining and the secondary lining are secured. The thickness of the filler layer formed during the lining can be easily adjusted, and the strength of the shield tunnel can be easily adjusted. For this reason, in the bent portion of the shield tunnel or the like, by adjusting the thickness of the filler layer appropriately, an excellent effect is obtained in that a smooth inner surface can be easily obtained for the secondary lining.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing one embodiment of a shield tunnel of the present invention.

FIG. 2 is a front sectional view of the shield tunnel of FIG. 1 as viewed from an axial direction.

FIG. 3 is a front sectional view showing a primary lining and a secondary lining of the shield tunnel of FIG. 2;

FIG. 4 is a sectional view showing a panel attaching means attached to an inner surface of a segment constituting a primary lining of the shield tunnel of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield tunnel, 2 segment, 2a segment inner surface, 3 primary lining, 4 secondary lining, 5 waterproof panel, 5a filler injection hole, 6 filler layer, 7 clearance, 8 spacer protrusion, 10 panel mounting means (insert parts).

 ──────────────────────────────────────────────────の Continuation of the front page (71) Applicant 000230010 Geostar Co., Ltd. 4-2-2 Shiba, Minato-ku, Tokyo (72) Inventor Hiroki Someya 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Ishi Kawashima Construction Materials Co., Ltd. In-house (72) Inventor Tadashi Tanaka 1-1-12 Yurakucho, Chiyoda-ku, Tokyo Ishikawashima Kenzai Kogyo Co., Ltd. (72) Inventor Masayoshi Nakagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction (72) Inventor Masashi Yamamoto 1-7-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Noriyuki Shima 1-1-18 Kyobashi 1-chome, Chuo-ku, Tokyo In-house (72) Inventor Koji Sasayama 1-1-18 Kyobashi, Chuo-ku, Tokyo Inside C-I Kasei Co., Ltd. (72) Inventor Takeo Arakida 1-18 Kyobashi, Chuo-ku, Tokyo No. 1 CHI Kasei Co., Ltd. (72) Inventor Yuichi Masuda 1-18-1 Kyobashi, Chuo-ku, Tokyo CHI Kasei Co., Ltd. (72) Inventor Yutaka Fujino 2-3-3 Shiba, Minato-ku, Tokyo No. Geostar Co., Ltd. (72) Inventor Akira Kase 2-3-2 Shiba, Minato-ku, Tokyo Geostar Co., Ltd. F-term (reference) 2D055 BA01 BB01 CA01 CA04 JA00 KB11 LA02

Claims (2)

[Claims] 1. A shield tunnel constructed by joining a large number of segments in a state where joining end surfaces thereof are joined to each other and having a cylindrical shape, comprising: a tubular primary lining formed by joining a large number of the segments; By attaching a waterproof panel made of resin attached to the inner surface of the primary lining while securing the water blocking property by the panel attaching means provided on the inner surface side of the segment constituting the primary lining, the primary lining is formed. A secondary lining for lining the inner surface of the lining, and a filler is filled in a clearance interposed between the primary lining and the secondary lining through a filler injection hole formed in the waterproof panel. And a filler layer formed by injection and filling. 2. The shield tunnel according to claim 1, wherein the clearance is secured by abutting a spacer projection protruding from the waterproof panel on the primary lining.