JP3494892B2 - Shield tunnel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel constructed along an axial direction of an excavation hole, and more particularly to a shield tunnel having watertightness. 2. Description of the Related Art As a method of constructing a tunnel, a so-called shield method is known 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. Is common. 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 to each other 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 in a state where the joining surfaces of the segments are in contact with each other so that the portions communicate with each other. There is also a structure in which insert fittings, which are nut members, are embedded in mutual segments, and bolts that penetrate adjacent segments are fastened and joined to each other. By the way, 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, spray coating of resin, or the like is employed. The secondary lining with cast concrete is 150 m on the inner surface of a cylindrical wall 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 achieved. 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, and causes an increase in cost and an extension of the construction period. The problem that it became. In other words, 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. In addition, 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 conduit When used as a road, the flow rate is limited. On the other hand, in the case of spray coating with a 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 increase significantly, 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 extended.
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 troublesome for a worker. Regardless of the concrete laying 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-hours, further increasing the cost, This causes an increase in the flow path resistance. As described above, in the shield tunnel used as a water conduit, it has been required to develop a technology that can reduce the cost, shorten the construction period, and the like, and easily obtain high waterproofness and corrosion resistance. . [0005] The present invention has been made in view of the above-mentioned problems, and uses a waterproof panel made of a resin to provide high waterproofness.
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. 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 the joining end faces thereof are joined to each other and forming a cylindrical shape. A cylindrical primary lining formed by joining a large number of segments, and a resin waterproof panel attached to the inner surface of the primary lining by means of panel mounting means provided on the inner surface of the segments constituting the primary lining. The primary lining and the secondary lining are lined up while securing the water-stopping property, and a secondary lining for lining the inner surface of the primary lining is provided. A filler layer formed by injecting and filling a filler into a clearance interposed between the next lining and the sealing panel.
Abut the spacer projection protruding from the
By doing so, the clearance is secured and the waterproof panel
Was inserted through a mounting hole passing through the spacer projection.
Screws are joined and attached to the panel attachment means
The present invention provides a shield tunnel characterized in that the above-mentioned problem is solved. An 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. In FIG. 1 and FIG. 2, the 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 water-tightly lining the inner surface side of the primary lining 3. [0008] 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 segments 2 and the dimension in the axial direction is about two segments 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 installation in the circumferential direction. If a large number of waterproof panels are used to reduce the number of continuous installations, 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 filling material into a clearance 7 between the primary lining 3 and the secondary lining 4 from a filling material injection hole 5a 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 the segments 2 are joined and fixed in the axial direction and the circumferential direction by bolts. . As shown in FIG. 1, the waterproof panel 5 is formed from 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 a target distance by abutting the spacer projection 8 on the segment inner surface 2 a, and the clearance 7
Is formed. Therefore, the waterproof panel 5 is
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 attaching the pipes and connecting them in the axial direction and the circumferential direction of the tunnel while ensuring the waterproofness. Waterproofness is secured between the waterproof panels 5 adjacent in the axial direction and the circumferential direction by a caulking material or the like, whereby the secondary lining 4 having watertightness 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 fills the entire space between the primary lining 3 and the secondary lining 4 without any gaps 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 filling material is injected into the clearance 7.
Although the filler layer 6 having a substantially constant thickness is formed, even if 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 secured. 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 formed in the axial direction and the circumferential direction while maintaining the water blocking property exhibits high watertightness, so that even when the secondary lining 4 is 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-blocking property, high water-blocking properties can be 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 formed by connecting the waterproof panels 5, when used as a water conduit, the flow path resistance at the time of water flow can be reduced, and a large flow rate of water flow 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 (e.g., curved) can be easily obtained by the shape and the like of the waterproof panel located at the bent portion, and can be dealt with only by 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 countermeasures based on the shape of the waterproof panel, the amount of protrusion of the spacer projection 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. Furthermore, 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). Compared with the conventional construction such as concrete casting or resin coating, the construction is easier, so that the construction period can be shortened and the cost can be reduced. Note that the segment of the present invention is not limited to the above embodiment, and various changes can be made. 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 joint end face of the segment, 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 or a steel plate can also 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-described insert fittings.
Various configurations such as fitting holes into which elastic claws projecting from the waterproof panel are fitted can be adopted. 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 number of segments stops the waterproof panel made of resin. Lining with secondary lining that is continuously installed while securing water,
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 injecting and filling 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 a waterproof panel using the panel attaching means provided on the inner surface side of the primary lining segment, compared to conventional concrete casting or resin coating, 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 can be obtained, and the excellent effect of shortening the construction period can be obtained. Play. Further, the spacer protrusion which projects from the waterproof panel, by contact with the primary lining, because the clearance is ensured, filled is formed between the primary lining and secondary lining The thickness of the material layer can be easily adjusted, and the strength of the shield tunnel can be easily adjusted. Therefore, in a bent portion of the shield tunnel or the like, by adjusting the thickness of the filler layer as appropriate, an excellent effect that a smooth inner surface can be easily obtained for the secondary lining is exhibited.

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 cross-sectional view showing panel mounting means mounted on the inner surface of a segment constituting the primary lining of the shield tunnel of FIG. [Description of Signs] 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 projection, 10 Panel mounting means (insert parts).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Someya 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawajima Construction Materials Industry Co., Ltd. (72) Inventor Tadashi Tadashi 1-21-1 Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Construction Materials Industry Co., Ltd. (72) Inventor Masayoshi Nakagawa 1-7-2 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Masashi Yamamoto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Nobuyuki Shima 1-1-18 Kyobashi, Chuo-ku, Tokyo C.I.Kasei Co., Ltd. (72) Inventor Koji Sasayama 1-1-18 Kyobashi, Chuo-ku, Tokyo C.I. In-company (72) Inventor Takeo Arakida 1-1-18 Kyobashi, Chuo-ku, Tokyo C-I Kasei Co., Ltd. (72) Inventor Yuichi Masuda, Kazuto Kyobashi, Chuo-ku, Tokyo No. 18-1, C Kasei Co., Ltd. (72) Inventor Yutaka Fujino 2-3-2 Shiba, Minato-ku, Tokyo Geostar Co., Ltd. (72) Inventor Akira Kase 4-2-2 Shiba, Minato-ku, Tokyo No. 3 Inside Geostar Co., Ltd. (56) References JP-A-8-35398 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/04 E21D 11/38

Claims (1)

(57) [Claim 1] A shield tunnel constructed by joining a large number of segments in a state where their joining end faces are aligned with each other, and forming a cylindrical shape. The cylindrical primary lining and the panel mounting means provided on the inner surface side of the segment constituting the primary lining ensure the waterproofness of the resin waterproof panel attached to the inner surface side of the primary lining. A secondary lining for lining the inner surface of the primary lining by being continuously provided, and between the primary lining and the secondary lining via a filler injection hole formed in the waterproof panel. In a shield tunnel including a filler layer formed by injecting and filling a filler into a clearance interposed therebetween, a spacer protrusion protruding from the waterproof panel is brought into contact with the primary lining, whereby the clearance is increased. Is secured The waterproof panel has a mounting hole penetrating the spacer protrusion.
The screw inserted into the panel mounting means is
The shield tunnel according to claim 1, wherein the shield tunnel is attached .