JP6350943B2 - Final joining method of submerged tunnel - Google Patents

Description

  In the construction of the submerged tunnel, the submerged tunnel is formed by inserting a final junction box having both ends tapered into the final joint portion of the existing tunnel in which the joint surfaces at the front ends are arranged opposite to each other with a final joint interval and are hydraulically joined. The present invention relates to a final bonding method of a tunnel.

  Conventionally, as the final joining method of the submerged tunnel by hydraulic joining, as the final joining box to be finally deposited, a downwardly tapered final joining box in which the joint surfaces at both ends are inclined obliquely downward is used, and is first set. Both joint surfaces of an existing submerged box facing each other are tapered so as to be inclined at the same angle as the slope of the joint surface of the final submerged box. After settling the box and adjusting the set height, the joining surfaces are joined via a water-stopping rubber that expands by mortar injection, and then the water between the bulkheads of the joint is drained by water pressure. A final bonding method for a submerged tunnel by hydraulic bonding in which a final bonding box is pulled into a final bonding interval to perform primary water stop has been developed (for example, Patent Document 1).

  In these methods, in order to adjust the height of the final junction box, a foundation for provisional support is constructed at the bottom of the water, and a jack for finely adjusting the height of the final junction box is installed on the base. The height of the final box is finely adjusted.

  In addition, as a final method of joining a submerged tunnel by this type of water pressure welding, use a horizontal taper-shaped final joint and a final joining box, and use the water pressure after the primary water stop with the same waterproof rubber as described above. And the method of drawing in the last junction box in a horizontal direction is proposed (for example, patent document 2, FIG. 5).

Japanese Patent Laid-Open No. 11-152663 JP-A-5-44396

  As described above, the final joining method of the submerged tunnel by the conventional hydraulic joining method is to install a member for temporarily receiving the final joining box at the final joining part between the existing tunnels, and place the final submerging box on the final joining work. After finishing, because mortar is injected into the gap between the bottom surface of the final submergence box and the bottom of the bottom to stabilize the final submergence box, it takes time to fill the gap under the final submergence box, There was a problem that the construction period was long and the construction cost increased.

  In addition, in the conventional method using a final joining box having a tapered shape in the horizontal direction, the final joining box is moved in the horizontal direction and pulled into the final joining part. The larger the is, the more difficult it is to pull in the horizontal direction before hydraulic joining, and if the submergence box is installed in a groove where the bottom of the water has been excavated, it will be sufficient to the side of the final joint. There are many cases where there is no space, and there are cases where horizontal movement work cannot be performed in a state of being temporarily received at the bottom of the water.

  Furthermore, when joining the final bonding box by hydraulic bonding, it is necessary to install the final bonding box so that the error in the distance between the bonding surfaces is below a certain level. In this state, many difficulties are expected to perform a highly accurate horizontal movement operation.

  In view of such a conventional problem, the present invention can be easily performed in a short time to install the final joining box in a predetermined position in the final joining portion prior to the hydraulic joining. For the purpose of providing a final bonding method for submerged tunnels that allows final bonding work after the foundation has been built in advance, and does not require or significantly reduces backfilling work after installation of the final bonding box as in the past. It was made.

The feature of the invention described in claim 1 for solving the conventional problem as described above is in the final junction part of the submerged tunnel constructed by submerging the submerged container in the water bottom, and the final junction box is inserted. The existing tunnel-side joint surfaces arranged opposite to each other are formed so as to be tapered in a horizontal direction, and the final joint portion is tapered corresponding to the taper shape of the both existing tunnel-side joint surfaces. Inserting a final junction box having a final junction box side joint surface of the arrangement, and final joining of the submerged tunnel for hydraulic joining by reducing the pressure between the end face of the final junction box and the existing tunnel side joint surface of the final joint portion in the method, the therebetween the existing tunnel and the final junction box making, in contact said guide member for infeed has an inclined guide surface in the direction infeed final junction box making the guide surface And a guided member for feeding, and the final joining box is lowered in the final joining portion to feed the final joining box obliquely downward to a joining position with respect to the existing tunnel side joining surface in the tapered arrangement. It is to be included.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the feeding guide member is provided in an arrangement protruding upward from the upper surface of the existing tunnel end portion, and the inclined guide surface is finally provided. It is provided in an arrangement that is inclined downward on the surface of the joining box in the feeding direction, and the guided member for feeding is provided on the upper surface of both ends of the final joining box so as to protrude in the horizontal direction.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the transmission is provided between the tapered rear side surface of the final junction box and the end side surface of the existing tunnel corresponding thereto. A regulation guide member having a regulation guide surface having an inclination corresponding to the sloped guide surface of the guide member for fitting, and a guided member for regulation that moves in contact with the regulation guide surface. When the feeding operation is performed obliquely downward by the side inclined guide and the guided member for feeding, the feeding operation beyond the feeding operation by the feeding side inclined guide and the guided member for feeding is regulated. It is in doing so.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the regulating guide member is provided in an arrangement projecting laterally from both side surfaces of the existing tunnel on the tapered rear side of the final joint portion. The restricting guide surface is provided on the lower surface, and the restricting guided member is provided on the tapered rear side surface of the final junction box so as to protrude toward the existing tunnel side.

  According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects, either one of the upper surface of the end portion of the existing tunnel and the upper surface of both ends of the final bonding box Provided with a jack for adjusting the axial position of the final joint box and a pressure-bearing member for abutting the tip end of the push-out shaft of the jack on the other side, the guide member for feeding and the guided member for feeding It is to adjust the position of the final joining box in the axial direction when the member is fed obliquely downward to the joining position of the final joining box.

The present invention is the final junction part of the submerged tunnel constructed by submerging the submergence box in the bottom of the water as claimed in claim 1, wherein the existing tunnel side joint surfaces arranged opposite to each other into which the final junction box is inserted Is formed so as to have a taper-like arrangement in the horizontal direction, and a final joint box-side joint surface having a taper-like arrangement corresponding to the taper shape of the both existing tunnel-side joint surfaces is formed on the final joint part. In the final joining method of a submerged tunnel in which a final joining box is inserted and hydraulically joined by reducing the pressure between the end face of the final joining box and the existing tunnel side joining surface of the final joining part, therebetween with a box, and a guided member for infeed to move in contact the final junction box making for infeed has an inclined guide surface in the direction infeed guide member to said guide surface In addition, by lowering the final bonding box within the final bonding portion, the final bonding box is fed obliquely downward to the bonding position with respect to the existing tunnel side bonding surface of the tapered arrangement, thereby providing a bottom foundation. It is possible to install the final bonding box directly on the top, and the work of moving to the final installation position at the bottom of the final bonding box as before and filling the gap below the final bonding box after moving to the final installation position No mortar filling work is required. For this reason, it becomes possible to make the last junction box of the same length as the submergence box which comprises the existing tunnel, and can aim at the cost reduction of submergence box construction.

  According to the present invention, the feeding guide member is provided in an arrangement projecting upward from the upper surface of the existing tunnel end, and the inclined guide surface is provided on the feeding direction side of the final junction box. The guide member for feeding is provided so as to protrude in the horizontal direction on the upper surface of both ends of the final joining box, so that it is moved obliquely downward and finally settled. The structure of the mechanism for the guide installed on the bottom foundation at a position can be configured easily and at low cost, and each member for the guide is located at a position away from the joint surface between the final junction box and the existing tunnel. It will be installed, and it can be made not to interfere with the joining work.

  According to a third aspect of the present invention, the inclined guide member is inclined between the tapered rear side surface of the final junction box and the end side surface of the existing tunnel corresponding thereto. A regulating guide member having an inclined regulating guide surface corresponding to the surface, and a regulated guided member that moves in contact with the regulating guide surface, the feeding-side inclined guide and the feeding guide By controlling the feeding operation beyond the feeding operation by the feeding side inclined guide and the guided member for feeding at the time of the obliquely downward feeding operation by the guide member, a taper shape Since the insertion of the final bonding box into the final bonding portion is performed while restricting excessive travel in the insertion direction, the diagonally downward movement to the final setting position is accurately performed.

  According to the present invention, as described in claim 4, the regulating guide member is provided in an arrangement projecting laterally from both side surfaces of the existing tunnel on the tapered rear side of the final joint portion, and on a lower surface thereof. The guide for regulating the feeding is provided by providing the regulating guide surface, and providing the regulated guided member on the tapered rear side surface of the final junction box so as to protrude toward the existing tunnel side. The structure of the mechanism for this is simple and can be configured at low cost, and each member for the guide is installed at a position deviated from the joining surface between the final joining box and the existing tunnel, which hinders the joining work. Can not come.

  According to the present invention, as described in claim 5, the axial position of the final junction box on either one of the upper surface of the end portion of the existing tunnel and the upper surface of both ends of the final junction box And a pressure bearing member that abuts the tip of the jack's push-out shaft on the other side, and slanted to the joining position of the final joining box by the feeding guide member and the guided member for feeding By adjusting the axial position of the final bonding box during the downward feeding operation, the direction of the final bonding box and the interval between the final bonding box and the existing tunnel can be adjusted easily and accurately. .

It is a front view which shows an example of the Example of the final joining method of the submerged tunnel which concerns on this invention, and shows the state before settling of the last joining box. It is a top view same as the above. It is a front view of the final junction box installation completion state in the same Example. It is a top view same as the above. It is a fragmentary sectional view which shows an example of the primary water stop state between the joint surfaces of an existing tunnel and a last junction box same as the above. FIG. 6 is a partial cross-sectional view illustrating an example of a final joining completion state in FIG. 5. FIGS. 1 and 2 show a step of inserting a final junction box between existing tunnels in the embodiment shown in FIGS. 1 and 2, and (a) shows that a guided member for feeding is positioned right above the guiding member for feeding. FIG. 6B is a front view of the state where the guided member for feeding is in contact with the top of the feeding guide member. Similarly, the process of inserting the final junction box between the existing tunnels is shown, (a) is a front view of a state in which the guided member is moving along the guide surface, and (b) is immediately before the final installation position. It is a front view of the state which adjusts the horizontal position of the last junction box by a position.

  Next, the best mode for carrying out the present invention will be described based on the embodiments shown in the drawings. In this example, the final junction box 25 is floated on the water as shown in FIGS. 1 and 2, and inserted into the final set position between the existing tunnels 10 and 10 as shown in FIGS. In the figure, reference numerals 10 and 10 denote existing tunnels to be joined by the final joining method of the buried tunnel of the present invention. Both the existing tunnels 10 may be constructed by sinking the submerged box 11 on the water bottom foundation 12 and connecting them to each other. Although not shown in the figure, the existing tunnels 10 are projected from the bottom side surface of the shaft. It may be a joint surface of different arrangement.

  For example, a screed foundation composed of a rubble mound formed on the water bottom ground is used as the water bottom foundation 12, but other foundation structures may be used.

  The bottom foundation 12 is constructed at the bottom of a groove 13 excavated from the bottom of the water, and both side portions of the groove 13 are upward inclined surfaces 14.

  The existing tunnel side joint surfaces of the existing tunnels 10 and 10 facing each other are closed by a bulkhead 15 as shown in FIGS. 1 and 5, and are joined in a ring shape around the periphery (hereinafter referred to as “existing tunnel side joints”). 16 is formed, and a packing 17 that is expanded by injecting mortar into the inside is fixed to the joint surface 16 as shown in FIGS. The mortar 19 can be injected from the injection tube 18.

  The existing tunnel side joint surfaces 16 and 16 are inclined in directions opposite to each other with respect to the tunnel axial direction, and a final joint portion 20 having a tapered shape in which one side surface side is longer than the other side surface side is formed. The foundation below the final joint portion 20 is the same screed foundation as the foundation of the existing tunnels 10 and 10.

  A final junction box 25 is inserted into the final junction portion 20 between the existing tunnels 10 and 10. The final joining portion 20 and the final joining box 25 may be the same length as the sinking box 11 constituting the existing tunnel 10 or may be shorter or longer.

  As shown in FIG. 2, both end portions 26, 26 of the final bonding box 25 are formed in a taper shape that fits in the final bonding portion 20, and frame-shaped bonding surfaces (hereinafter referred to as “final bonding”) around the both ends. 27 is formed, and the inside thereof is closed by a bulkhead 28.

  Between the existing tunnel 10 and the final bonding box 25, a feeding guide for guiding the final bonding box 25 to a predetermined final insertion position of the final bonding portion 20 is provided. The feeding guide includes a feeding guide member 30 having an inclined guide surface 31 and a guided member 33 for feeding that moves in contact with the guide surface 31.

  When the final joining box 25 is lowered in the final joining portion 20 by this feeding guide, the final joining box 25 is sent obliquely downward to the joining position with respect to the existing tunnel side joining surface 16 having a tapered arrangement. .

  In this example, the feeding guide member 30 is provided in an arrangement protruding upward on the upper surface of the end portion of the existing tunnels 10 and 10, and the inclined guide surface 31 is directed downward to the surface in the feeding direction side of the final junction box. It is provided in an inclined arrangement.

  The feeding guide member 30 is formed with a temporary support portion 32 that is horizontally disposed on the rear side from the uppermost portion of the inclined guide surface 31.

  On the other hand, the guided member 33 for feeding is provided on the upper surfaces of both ends of the final joining box 25 so as to protrude in a cantilever shape in the horizontal direction.

  Further, between the final junction box 25 and the existing tunnels 10 and 10, the feeding guide member 30 and the guided member 33 for feeding described above in the feeding direction more than the obliquely downward feeding planned by the feeding guide member 30 and the guided member 33 for feeding. A feed restriction guide for restricting movement is provided.

  The feeding restriction guide includes a restriction guide member 35 having an inclined restriction guide surface 36 and a restriction guided member 37 that moves in contact with the guide surface 36. The restricting guide surface 36 is inclined toward the front lower side in the feeding direction at an angle corresponding to the inclined guide surface 31 of the feeding guide member 30 described above. A guide member contact surface 38 that is vertically disposed is formed at the upper end of the regulation guide surface 36.

  In this example, the restricting guide member 35 is provided in an arrangement projecting laterally on both side surfaces of the existing tunnel on the tapered rear side of the final joint portion 20, and the restricting guide surface 36 is provided on the lower surface thereof, The guided member 37 is provided on the tapered rear side surface of the final bonding box 25 so as to protrude in a cantilever shape toward the existing tunnels 10 and 10 side.

  Further, between the final junction box 25 and the existing tunnels 10, 10, before the final junction box 25 reaches the final insertion position, the axial position of the final junction box 25, that is, the existing tunnels 10, 10. An axial position adjusting device for adjusting the distance between the joint surface and the joint surfaces at both ends of the final joint box 25 is provided.

  The axial position adjusting device includes a hydraulic jack 40 installed on the upper surfaces of both ends of the final junction box 25 toward the existing tunnels 10 and 10, and a direction protruding from the upper surfaces of the end portions of the existing tunnels 10 and 10. It is comprised from the supporting member 42 which contact | abutted the front-end | tip of the extrusion shaft 41 of the jack 40 installed in this. In the operation of feeding the jack 40 obliquely downward to the final insertion position of the final joining box 25 by the feeding guide member 30 and the guided member 33 for feeding, the pushing shaft 41 of the jack 40 is used as the supporting member 42. The position of the final joint box 25 in the axial direction with respect to the existing tunnels 10 and 10 is adjusted by abutting and operating.

The hydraulic jack 40 is installed in a direction orthogonal to the final bonding box side bonding surface 27. Further, the bearing member 42 is installed in parallel with the existing tunnel-side joining surface 16, and the width of the bearing surface is from before reaching the final insertion position of the final joining box 25 to the final insertion position. In FIG. 5, the hydraulic jack 40 is formed at a position and a width where the end of the extrusion shaft 41 abuts.
Next, the step of setting the final bonding box 25 will be described.

  As shown in FIG. 1, the final bonding box 25 floats on the water and is towed, and is stopped above the desired final bonding portion 20. Next, although not shown in the figure, a suspending vessel is used to sink while adjusting the buoyancy. At this time, the taper-shaped directions of the final bonding box 25 and the final bonding portion 20 are aligned in advance, and lowered to the rear side from the final insertion position in the final bonding portion 20 as shown in FIG.

  Then, as shown in FIG. 7 (a), at a position slightly above the position where the guided member 33 for feeding of the final joining box 25 gets on the temporary support portion 32 of the guiding member 30 for feeding on the existing tunnel 10. Then, the guide member contact surface 38 of the guide member 35 for regulation is horizontally moved so that the guide member 37 for regulation at the rear end of the final bonding box 25 contacts. In this contact state, it is set in advance so that the guided member 33 for feeding of the final joining box 25 is positioned above the temporary support portion 32 of the guiding member 30 for feeding.

  Next, as shown in FIG. 7B, the final bonding box 25 is lowered and the guided member 33 for feeding is brought into contact with the temporary support portion 32. At this time, the arrangement between the members is set in advance so that the regulated guided member 37 is lowered to the rear of the upper end of the regulating guide surface 36.

  In this state, as shown in FIG. 8A, the final joining box 25 is moved forward and lowered until the feeding guided member 33 is positioned on the upper end of the guide surface 31. As a result, the guided member 33 for feeding is moved diagonally downward and forward by being guided by the inclined surface of the guiding member 30 for feeding. At this time, the regulated guided member 37 moves along the regulating guide surface 36, and the final joining box 25 is restricted from moving forward from the inclined surface of the feeding guide member 30.

  In this way, the final bonding box 25 is inserted into the final bonding portion 20, and the axial position and angle of the final bonding box 25 are adjusted before reaching the final insertion position as shown in FIG. 8B. To do. This adjustment is performed by pressing the pushing shafts 41 of the four hydraulic jacks 40 on the final joining box 25 against the corresponding supporting pressure members 42 and adjusting the pushing length. By this adjustment, the existing tunnel side bonding surface 16 and the final bonding box side bonding surface 27 are arranged in parallel to each other.

  The hydraulic jack 40 is operated in accordance with the interval between the existing tunnel side joining surface 16 and the final joining case side joining surface 27 corresponding to the operation of the final joining box 25 in the forward direction thereafter. The surfaces 16 and 17 are controlled to be parallel.

  After finely adjusting the direction of the final joining box 25 in this way, as shown in FIGS. 3 and 4, the final joining box 25 is moved obliquely downward to the final insertion position and installed on the water bottom foundation 12, as described above. Thus, a temporary water stop operation by injecting and expanding the mortar into the packing 17, a hydraulic joint between the joint surfaces 16 and 27 by drainage between the bulk heads 15 and 15, a removal of the bulk head, and a final joint with the existing tunnel 10 Various operations such as connection with the box 25 are sequentially performed.

DESCRIPTION OF SYMBOLS 10 Existing tunnel 11 Submerged box 12 Water bottom foundation 13 Groove 14 Inclined surface 15 Bulkhead 16 Existing tunnel side joint surface 17 Packing 18 Injection pipe 19 Mortar 20 Final joint part 25 Final joint box 26 End (of final joint box)
27 Final joining box side joining surface 30 Guide member for feeding 31 Guide surface 32 Temporary support portion 33 Guide member for feeding 35 Guide member for regulation 36 Guide surface for regulation 37 Guided member for regulation 38 Guided member contact surface 40 Hydraulic jack 41 Extrusion shaft 42 Bearing member

Claims (5)

In the final junction part of the submerged tunnel constructed by submerging the submergence box to the bottom of the water, the existing tunnel side joint surfaces facing each other where the final junction box is inserted will be tapered in a horizontal direction. In the final joint portion, a final joint box having a final joint box side joint surface with a tapered arrangement corresponding to the taper shape of the both existing tunnel side joint surfaces is inserted into the final joint part. In the final bonding method of the submerged tunnel in which the pressure is reduced between the end surface and the existing tunnel side bonding surface of the final bonding portion,
Between the existing tunnel and the final joining box, a feeding guide member having a guide surface inclined toward the feeding direction of the final joining box and a guided member for feeding moving in contact with the guide surface And
The final junction of the submerged tunnel, wherein the final junction box is lowered in the final junction portion so that the final junction box is fed obliquely downward to a junction position with respect to the existing tunnel side junction surface of the tapered arrangement. Method. The feeding guide member is provided in an arrangement protruding upward on the upper surface of the existing tunnel end portion and provided in an arrangement in which the inclined guide surface is inclined downward to the surface on the feeding direction side of the final bonding box,
The submerged tunnel final joining method according to claim 1, wherein the guided member for feeding is provided so as to protrude horizontally on the upper surfaces of both ends of the final joining box. Between the tapered rear side surface of the final junction box and the end side surface of the existing tunnel corresponding to the tapered rear side surface, an inclined regulating guide surface corresponding to the inclined guide surface of the feeding guide member is provided. A regulating guide member, and a regulated guided member that moves in contact with the regulating guide surface,
When the feeding side inclined guide and the guided member for feeding are in the obliquely downward feeding operation, the feeding operation more than the feeding operation by the feeding side inclined guide and the guided member for feeding is performed. The final bonding method for a submerged tunnel according to claim 1 or 2, wherein:   The restricting guide member is provided in an arrangement projecting laterally on both side surfaces of the existing tunnel on the tapered rear side of the final joint portion, and the restricting guide surface is provided on a lower surface thereof, and the restricted guide is provided. The final joining method of the submerged tunnel according to claim 3, wherein the members are provided on the tapered rear side surface of the final joining box so as to protrude toward the existing tunnel side.   A jack for adjusting the axial position of the final joining box is provided on either one of the upper surface of the end part of the existing tunnel and the upper surface of both ends of the final joining box, and the jack on the other side. A pressure bearing member that abuts the tip of the extrusion shaft, and the final joining is performed during an operation of feeding obliquely downward to the joining position of the final joining box by the feeding guide member and the guided member for feeding. The final joining method of the submerged tunnel according to claim 1, wherein the axial position of the box is adjusted.

Images