JP2018109329A - Tunnel skeleton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel skeleton having a simple structure and high water-stop performance.SOLUTION: The tunnel skeleton is constructed in an area which includes: an inner space of plural outer shell tunnels arrange parallel to each other enclosing a tunnel construction planned area; and a communication space which is formed by removing and cut out a part of facing segments of the neighboring outer shell tunnel and by drilling the ground. The tunnel skeleton includes: a steel shell split body having a generally rectangular shape in a plan view which constitutes a cylindrical body by connecting plural steel shell split bodies in a length direction and in a width direction; and a filler concrete filled in the hollow part of the steel shell split body. The steel shell split body is supported by the outer shell tunnel via an opening reinforcement pillar which is capable of reinforcing the outer shell tunnel while holding the steel shell split body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tunnel housing that encloses a planned construction area of a tunnel with a plurality of outer shell tunnels and constructs the inner space of the plurality of outer shell tunnels.

  Conventionally, as a lining body of a large section tunnel constructed in the ground, for example, in Patent Document 1, a part of each segment of a plurality of roof shield tunnels constructed so as to surround a construction planned area of an underground cavity is removed. A series of lining concrete is disclosed in which a communication space is provided between the roof shields, and the communication space and the roof shield are filled with concrete. These lining concretes have an opening in which the waterproof sheet is installed on the outer periphery of the lining concrete in a range where it comes into contact with the natural ground, and the edges of the waterproof sheet are removed from the segments in the roof shield tunnel. It is connected to the peripheral part of the part.

  On the other hand, in Patent Document 2, a formwork is installed in a communication space constructed between a roof shield tunnel and a roof shield tunnel constructed so as to enclose a planned construction area of an underground cavity, and lining concrete is cast and filled. A permanent lining wall having a ring-shaped cross section constructed by the above is disclosed. In a permanent lining wall using such a formwork, it is general to employ a method of ensuring waterproof performance by laying a waterproof sheet on the entire outer surface side.

JP 2009-174169 A Japanese Patent No. 4958035

  However, in the method of Patent Document 1, it is difficult to completely seal the connecting portion between the waterproof sheet installed in the range in contact with the ground of the lining concrete and the peripheral edge of the opening in the roof shield tunnel, It may invite water leakage.

  Moreover, in the method using a formwork like patent document 2, it installed so that the stiffener for stiffening the roof shield which removed the segment partially may extend in the radial direction seeing from the cross section of the underground cavity. In addition, a formwork arranged to connect adjacent roof shields is installed so as to extend in the circumferential direction of the underground cavity. As a result, the stiffener and the formwork interfere with each other. For example, it is necessary to provide a through hole in the formwork and allow the stiffener to pass therethrough. For this reason, the part where the joints are stored tends to become water, and a problem arises in the water stop performance of the main lining wall.

  This invention is made | formed in view of this subject, The main objective is to provide the tunnel housing provided with the simple structure and the high water stop performance.

  In order to achieve such an object, the tunnel housing of the present invention partially removes the inner space of a plurality of outer shell tunnels arranged in parallel so as to surround the tunnel construction planned region and the adjacent segments of the adjacent outer shell tunnels. A tunnel housing constructed in an area composed of a communication space constructed by excavating and excavating natural ground, and forming a cylindrical body by connecting a plurality of them in the length direction and the width direction. A rectangular steel shell divided body and filled concrete filled in a hollow portion of the steel shell divided body, the steel shell divided body supplementing the outer shell tunnel while sandwiching the steel shell divided body. It is characterized by being in a state of being supported by the outer shell tunnel through a rigid opening reinforcing column.

  According to the tunnel housing of the present invention, since the tunnel housing has a so-called SC structure made up of a plurality of steel shell divided bodies and filled concrete filled therein, compared to the case of a reinforced concrete structure, the rebar construction and the formwork Work such as work can be saved greatly, and a simple structure with good workability can be achieved.

  Further, without providing a through hole in the steel shell divided body, the steel shell divided body can be installed in the inner space of the outer shell tunnel while stiffening the outer shell tunnel with the opening reinforcing column. Thereby, since the gap | interval which becomes a water channel does not arise in the site | part which the opening reinforcement pillar in a steel shell division body interferes, it becomes possible to prevent the water leak to the inner space of a tunnel housing more reliably.

  The tunnel housing of the present invention is characterized in that a water-stopping material is provided on a side peripheral surface of the steel shell divided body.

  According to the tunnel housing of the present invention, since the water-stopping material is provided on the side peripheral surface of the steel shell divided body, the joint portion formed by connecting the plurality of steel shell divided bodies in the length direction and the width direction is provided. The water stop material is arranged. As a result, even when spring water is generated from the ground located on the outer peripheral side of the tunnel housing and water flows into the joint portion, the gap between the joint portions is not sealed by the water-stopping material, and a water channel is not formed. For this reason, it is possible to ensure a high water-stopping property for the tunnel housing.

  Further, in the tunnel housing of the present invention, the steel shell divided body includes an inner steel shell plate that constitutes an inner peripheral surface of the cylindrical body, an outer steel shell plate that constitutes an outer peripheral surface of the cylindrical body, A joint plate which is formed of a shear reinforcing bar disposed between the outer steel shell plate and the inner steel shell plate, and is disposed at both ends in the length direction of the inner steel shell plate and the outer steel shell plate, respectively. And main ribs arranged at both ends in the width direction, and longitudinal ribs arranged to connect the main girders, and at least the main girders and the joint plates of the outer steel shell plates A water stop material is provided.

  According to the tunnel housing of the present invention, the main girders provided for the inner steel shell plate and the outer steel shell plate respectively function as main bars and the vertical ribs function as force distribution bars. Only reinforcing bars are required. Thereby, it is not necessary to perform complicated bar arrangement work when assembling the steel shell divided body, and it is possible to greatly reduce the labor of the installation work. Moreover, the filling property of the filling concrete into the steel shell divided body is good, and a high-quality frame divided body can be constructed.

  According to the present invention, the tunnel housing can be a simple structure composed of an SC structure using a steel shell divided body, and the outer shell tunnel is stiffened by the opening reinforcing column without providing a through hole. Since a steel shell split body can be installed in the inner space, there is no gap between the steel shell split body where the opening reinforcement pillars interfere, and water leakage is prevented, preventing leakage of water into the tunnel housing. It becomes possible.

It is a figure which shows the outline of the large cross section tunnel of this invention. It is a figure which shows the detail of the tunnel housing of this invention. It is a figure which shows the detail of the steel shell division body of this invention. It is a figure which shows the cross section of the large section tunnel construction plan area | region of this invention. It is a figure which shows the support structure of the steel shell division body of this invention.

  The present invention provides a tunnel lining body constructed by surrounding a tunnel planned construction area with a plurality of outer shell tunnels arranged in parallel and using the inner spaces of the plurality of outer shell tunnels. It relates to the tunnel frame. In the present embodiment, as a tunnel to be constructed, a large-section tunnel constructed in a part of a main shield tunnel is taken as an example, and will be described below with reference to FIGS.

  The tunnel housing 9 is constructed, for example, as a main lining body of a large-section tunnel 3 that becomes a branching junction with the branch tunnel 2 in the main shield tunnel 1 as shown in the schematic diagram of FIG. In the present embodiment, the outer shape is constructed in a substantially cylindrical shape having a circular cross section, but is not necessarily limited to this, and the outer shape is a cylindrical body having an elliptical shape or a rectangular shape. A frustum shape may be used.

  Such a tunnel housing 9 is provided with a plurality of rectangular housing divisions 6 having a rectangular shape in plan view, and a plurality of the housing divisions 6 are connected in the length direction as shown in the side view of FIG. Constructed by connecting multiple in the direction. The housing divided body 6 is arranged so that the length direction thereof matches the circumferential direction of the tunnel housing 9 and the width direction thereof matches the axial direction of the tunnel housing 9. And the frame division body 6 is comprised by the steel shell division body 7 which is what is called a half precast member, and the filling concrete 8 with which the hollow part of the steel shell division body 7 is filled.

  As shown in a side view of FIG. 3A, the steel shell divided body 7 includes a curved plate-shaped inner steel shell plate 71 that forms the inner peripheral surface of the tunnel housing 9, and a curve that forms the outer peripheral surface of the tunnel housing 9. A plate-shaped outer steel shell plate 72 and a shear reinforcing bar 73 are provided. These are constructed by arranging a plurality of shear reinforcement bars 73 so that the convex surface of the inner steel shell plate 71 and the concave surface of the outer steel shell plate 72 are opposed to each other with a gap therebetween, and are connected in a state where a hollow portion is formed. It is done.

  As shown in FIG. 3B, the inner steel shell plate 71 includes a skin plate 711 made of a rectangular steel plate formed in an arc shape whose length direction forms the inner peripheral surface of the tunnel housing 9, and the width of the skin plate 711. A pair of main girders 712 installed at both ends in the direction, a pair of joint plates 713 installed at both ends in the length direction of the skin plate 711, and the skin plate 711 so as to connect the main girders 712 to each other. A plurality of vertical ribs 714 installed thereon.

  The main girder 712, the joint plate 713, and the vertical ribs 714 are all made of rectangular steel plates, and are installed so that the skin plates 711 and the surfaces are orthogonal to each other. It is installed so that the planes are orthogonal. The main beam 712, the joint plate 713, and the vertical rib 714 are all installed on the convex surface side of the skin plate 711.

  On the other hand, as shown in FIG. 3C, the outer steel shell plate 72 includes a skin plate 721, a pair of main girders 722, a pair of joint plates 723, and vertical ribs 724, as with the inner steel shell plate 71. The skin plate 721 is formed in an arc shape whose length direction forms the outer peripheral surface of the tunnel housing 9. Further, the main beam 722, the joint plate 723, and the vertical rib 724 are all installed on the concave surface side of the skin plate 721.

  As described above, the steel shell divided body 7 is formed with side circumferential surfaces formed by the main girder 712 and the joint plate 713 of the inner steel shell plate 71 and the main girder 722 and the joint plate 713 of the outer steel shell plate 72, and adjacent steels. The shell divided bodies 7 are joined in a state where these side peripheral surfaces are in contact with each other.

  That is, when the joint plates 713 of the inner steel shell plates 71 and the joint plates 723 of the outer steel shell plates 72 in the adjacent steel shell divided bodies 7 are brought into contact with each other to form a ring body. Further, when the main girders 712 of the inner steel shell plate 71 and the main girders 722 of the outer steel shell plate 72 are brought into contact with each other, a cylindrical body is formed.

  Therefore, as shown in FIGS. 3B and 3C, connecting members (not shown) are provided on the joint plates 713 and 723 and the main girders 712 and 722 of the inner steel shell plate 71 and the outer steel shell plate 72, respectively. A plurality of through-holes 715 and 725 are provided for penetrating them. In addition, if a connection member is a member which can connect the steel shell division bodies 7, any may be employ | adopted, such as a high strength volt | bolt.

  Further, as shown in FIG. 3C, two waterstops 10 are installed on the joint plate 723 and the main girder 722 of the outer steel shell plate 72 so as to sandwich a plurality of through holes 725. . Therefore, as shown in FIG. 3A, the water blocking material 10 is located in the joint portion 74 formed by connecting the plurality of steel shell divided bodies 7.

  Thereby, for example, when a water-swellable synthetic rubber is adopted as the water-stopping material 10, the water-stopping material can be used regardless of which water flows into the joint portion 74 formed on the outer steel shell plate 72 side. 10 swells and closes the gap between the joints 74. For this reason, even if it connects multiple steel shell division bodies 7, a water channel is not formed.

  Therefore, as shown in FIG. 2, the tunnel housing 9 constructed by connecting the steel frame divided body 6 filled with the filled concrete 8 to the steel shell divided body 7 has spring water in the natural ground on the outer peripheral side thereof. Even in this case, the large cross-section tunnel 3 formed in the inner space has a structure having a high water-stopping property without causing water leakage. In addition, as long as the water stop material 10 can ensure a water stop when water flows into the joint part 74, any material may be used.

  By the way, as shown in the cross-sectional view of FIG. 4A, the tunnel housing 9 having the above-described structure surrounds the periphery of the large-section tunnel construction planned region 4 and has a plurality of cross-sectional diameters smaller than the tunnel housing 9 arranged in parallel. It is constructed using the inner space of the outer shell tunnel 5.

  The outer shell tunnel 5 may be a tunnel constructed by any construction method such as a shield construction method or a propulsion construction method, but in this embodiment, a shield tunnel is adopted. Then, as shown in FIG. 5, each of the adjacent outer shell tunnels 5 is opened by removing a part of the opposing segment, and the ground between them is excavated and excavated to communicate with each other. A space 11 is provided.

  The tunnel housing 9 is constructed in a ring-shaped region formed by the communication space 11 that communicates with each of the adjacent outer shell tunnels 5 and the inner space of the outer shell tunnel 5. It is supported by the outer shell tunnel 5 through an opening reinforcing column 14 that also serves as stiffening.

  As shown in FIG. 5, the opening reinforcing column 14 includes an inner column 141, an outer steel shell plate 72, and an outer shell tunnel 5 disposed between the inner steel shell plate 71 and the outer shell tunnel 5 of the steel shell divided body 7. Three members including an outer column 142 disposed between the inner steel shell plate 71 and the outer steel shell plate 72, and an intermediate column 143 disposed between the inner steel shell plate 72 and the outer steel shell plate 72, respectively.

  That is, the opening reinforcing column 14 is divided into three members, and the intermediate column 143 functions as a hollow portion holding means of the steel shell divided body 7, while the intermediate column 143 and one end of the inner column 141 serve as the inner steel shell. While sandwiching the plate 71, the outer steel shell plate 72 is sandwiched between the intermediate column 143 and one end of the outer column 142. In this manner, the outer shell tunnel 5 is pressed at each of the other end of the inner column 141 and the other end of the outer column 142.

  Thereby, the steel shell divided body 7 is supported by the outer shell tunnel 5 via the opening reinforcing column 14, and as a result, the tunnel housing 9 is supported by the outer shell tunnel 5 via the opening reinforcing column 14. At this time, naturally, the inner column 141, the outer column 142, and the intermediate column 143 are coaxially arranged, so that the opening reinforcing column 14 is formed by removing the segment of the outer shell tunnel 5 that has been cut open. Also functions as a stiffener.

  As described above, the steel shell divided body 7 is supported by the outer shell tunnel 5 in a state where the outer shell tunnel 5 is sandwiched by the opening reinforcing columns 14 capable of stiffening the outer shell tunnel 5. Thereby, since it is not necessary to provide the hole which penetrates a support work in the steel shell division body 7, the tunnel housing 3 using the steel shell division body 7 maintains a high water stop performance without forming a water channel. It becomes possible to do.

  As shown in FIG. 2, the intermediate column 143 of the opening reinforcing column 14 is embedded when the steel shell divided body 7 is filled with the filled concrete 8. As shown in FIG. 4 (b), the inner column 141 of the opening reinforcing column 14 has an outer shell as shown in FIG. 2 when excavating the inner space of the tunnel housing 9 to construct the large section tunnel 3. The tunnel 5 is removed together with the portion located inside the tunnel housing 9.

  Further, as shown in FIG. 2, a filler 13 is filled between the tunnel housing 9 after construction and the inner peripheral surface of the outer shell tunnel 5, and the surrounding ground of the outer shell tunnel 5 has a tunnel housing 9. Prior to construction, the ground improvement unit 12 is constructed by a freezing method or a chemical solution injection method.

  As described above, the tunnel housing 9 has an SC structure including the housing divided body 6 in which the steel shell divided body 7 is filled with the filled concrete 8 and has a simple structure with good workability.

  Moreover, since it is not necessary to provide the through hole for penetrating the support which stiffens the outer shell tunnel 5 in the steel shell division body 7, the site | part which may cause a water leak when constructing the tunnel housing 9 Is only the joint portion 74 formed by connecting the plurality of steel shell divided bodies 7.

  However, in the joint portion 74, the waterstop material 10 is disposed on the main beam 722 and the joint plate 723 of the outer steel shell plate 72 that constitutes the side peripheral surface of the steel shell divided body 7. As a result, even when spring water is generated from the ground located on the outer peripheral side of the tunnel housing 9 and water flows into the joint portion 74, the gap between the joint portions 74 is sealed by the water stop material 10 to form a water channel. Therefore, it is possible to secure a high water-stopping property for the tunnel housing 9.

  Further, in the tunnel housing 9, the main girders 712 and 722 provided in the inner steel shell plate 71 and the outer steel shell plate 72 respectively function as main bars, and the vertical ribs 714 and 724 function as force distribution bars. Thereby, since the reinforcement work only needs to be the shear reinforcement 73, it is not necessary to perform a complicated reinforcement work when assembling the steel shell divided body 7, and the installation work can be greatly labor-saving. Become. Moreover, the filling property of the filling concrete 8 to the steel shell division body 7 is also good, and the frame division body 6 with high quality can be constructed.

  The tunnel housing 9 of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the present embodiment, as shown in FIG. 3C, the water stop material 10 is provided only on the joint plate 723 and the main beam 722 of the outer steel shell plate 72 constituting the steel shell divided body 7. It is not limited to this. The water stop material 10 may be provided also on the joint plate 713 and the main beam 712 of the inner steel shell plate 71. If it carries out like this, it will become possible to ensure high water-stop by the tunnel housing 9. FIG.

  On the other hand, even if the water sealant 10 is not provided in the steel shell divided body 7 and the joint portions 74 formed by connecting the plurality of steel shell divided bodies 7 are welded and sealed to ensure water-stopping properties. Good.

  Further, in the present embodiment, as shown in FIG. 5, three members of the inner pillar 141, the outer pillar 142, and the intermediate pillar 143 are adopted as the opening reinforcement pillar 14, but the present invention is not necessarily limited thereto. For example, as the intermediate pillar 143, a spacing member that holds the spacing between the inner steel shell plate 71 and the outer steel shell plate 72 may be used.

  Further, in the present embodiment, as shown in FIGS. 3B and 3C, in the inner steel shell plate 71 and the outer steel shell plate 72 of the steel shell divided body 7, only the end portions of the skin plates 711 and 721 are used. However, the middle main girders 712 ′ and 722 ′ are additionally installed in the meantime, but the added middle main girders 712 ′ and 722 ′ are appropriately set according to the strength required for the steel shell divided body 7. Just increase or decrease.

  In addition, the inner steel shell plate 71 and the outer steel shell plate 72 of the steel shell divided body 7 include at least main girders 712, 722, middle main girders 712 ', 722', and vertical ribs 714, 724, stud gibbles. It is good to set it as the structure which installs the slip prevention members, such as etc., and improves the integrity with the filling concrete 8. FIG.

The large-section tunnel 3 does not necessarily have to have a finished cross section exceeding 50 m ^2, and may have any cross-sectional diameter.

1 Main shield tunnel 2 Branch shield tunnel 3 Large section tunnel 4 Large section tunnel construction planned area 5 Outer shell tunnel 6 Frame segment 7 Steel shell segment 71 Inner steel shell plate 711 Skin plate 712 Main girder 713 Joint plate 714 Vertical rib 715 Through hole 72 Outer steel shell plate 721 Skin plate 722 Main girder 723 Joint plate 724 Vertical rib 725 Through hole 73 Shear reinforcement 74 Joint 8 Filled concrete 9 Tunnel frame 10 Water stop material 11 Communication space 12 Ground improvement part 13 Filler 14 Opening reinforcement column 141 Inner column 142 Outer column 143 Intermediate column

Claims (3)

A communication system constructed by excavating and clearing the inner space of multiple outer shell tunnels arranged in parallel so as to surround the planned tunnel construction area and partly cutting off the opposing segments of the adjacent outer tunnels. A tunnel housing constructed in an area consisting of space,
The steel shell divided body having a substantially rectangular shape in plan view, which forms a cylindrical body by connecting a plurality in the length direction and the width direction, and filled concrete filled in the hollow portion of the steel shell divided body,
A tunnel housing characterized in that the steel shell divided body is supported by the outer shell tunnel via an opening reinforcing column capable of stiffening the outer shell tunnel while sandwiching the steel shell divided body. . The tunnel housing according to claim 1,
A tunnel housing comprising a water stop material on a side peripheral surface of the steel shell divided body. In the tunnel housing according to claim 1 or 2,
The steel shell divided body includes an inner steel shell plate constituting the inner peripheral surface of the cylindrical body, an outer steel shell plate constituting the outer peripheral surface of the cylindrical body, the outer steel shell plate and the inner steel shell. It consists of shear reinforcements arranged between the plates,
The inner steel shell plate and the outer steel shell plate are respectively arranged so as to connect the joint plates disposed at both ends in the length direction, the main girders disposed at both ends in the width direction, and the main girders. And a vertical rib
At least the main girder and the joint plate of the outer steel shell plate are provided with the water stop material.