JP7004580B2 - Connection structure between the pipe roof and the starting tunnel - Google Patents

Description

The present invention relates to a connection structure between a pipe roof and a starting tunnel.

For example, when constructing a road tunnel in an urban area where soft ground is distributed, the excavation method is generally applied, but the excavation method has inherent problems such as noise, vibration, and traffic regulation during construction. .. In addition, since the space under the road in urban areas is congested with buried objects such as multiple subways and utility tunnels, the installation depth of tunnels to be newly constructed tends to be deeper, and the installation depth tends to be deeper. The deepening of the building is directly linked to the soaring construction costs. Against this background, the number of cases where the shield method is applied when constructing road tunnels is increasing. By the way, in the construction of this road tunnel, in the construction of a general road tunnel, for example, it is sufficient to construct a main tunnel having a circular cross section by excavating one shield excavator. On the other hand, the construction of the junction of road tunnels requires an extremely large-scale underground widening that covers each section of the main tunnel and ramp tunnel, and it is necessary to take various measures in the construction method. As an example of the construction method, there is a method of constructing a prepaid support by constructing an arc-shaped or straight pipe roof between two tunnels, a main tunnel and a ramp tunnel. After constructing this pre-reception support, the inside of the tunnel is supported by the support as necessary, and a part of the tunnel is removed while excavating directly under the upper pipe roof, for example, a large cross section in the shape of a multiple arc. Space is formed. Then, in the large cross-sectional space formed in this way, it is possible to construct a structure such as a junction of the road tunnel described above.
In this way, a construction method has been proposed that connects two tunnels arranged side by side in the ground using a pipe roof. More specifically, a construction method that connects the pipe roof and the starting side tunnel where the pipe roof starts. Methods and connection structures have been proposed. Regarding the construction method of the pipe roof, the first step of constructing while installing multiple tunnels in the ground, in the starting side tunnel where the steel pipe for the pipe roof is inserted into the ground, the steel pipe is guided to the inner sky side. A guide member is attached to the tunnel, and a steel pipe is inserted into the ground through the guide member to reach the arrival side tunnel, and a pipe roof is laid between both tunnels to form a pre-received support from the guide member. A pipe roof construction method (pipe roof) consisting of a second step of fixing the support member to the inner air surface of the starting tunnel while supporting the end of the steel pipe protruding to the inner air side of the starting tunnel with a supporting member. (For example, refer to Patent Document 1). On the other hand, regarding the connection structure of the pipe roof, the guide member for inserting the steel pipe into the ground is the starting side in which the steel pipe for the pipe roof is laid between a plurality of tunnels adjacent to the ground to form a pre-received support. The end of the steel pipe that is attached to the inner air side of the tunnel and protrudes from the guide member to the inner air side of the starting side tunnel is supported by the support member fixed to the inner air surface of the tunnel and protrudes to the inner air side of the tunnel. The end of the steel pipe is inserted into the opening of the box having the opening, and the support member is arranged so as to straddle the box body to fix the box body and the support member, and the support member is the inner air surface of the tunnel. It is a connection structure of the pipe roof (connection structure of the pipe roof and the starting side tunnel) in which the steel pipe and the box body are fixed by being fixed to the inside of the box and the filler is injected into the box body (see, for example, Patent Document 2). ..

Japanese Patent No. 5685507 Japanese Patent No. 5648416

According to the connection method and connection structure between the pipe roof and the starting side tunnel described in Patent Documents 1 and 2, when the pipe roof is bridged between two tunnels installed in the ground, for example, both tunnels are placed in the ground. By retrofitting a guide member (so-called entrance member) inside the starting side tunnel after construction, the guide member can be attached to an appropriate place in the starting side tunnel on the premise of a tunnel construction error when constructing the pipe roof. Therefore, it is possible to construct the pipe roof with high accuracy while allowing (or following the construction error) the construction error of the tunnel in the construction of the pipe roof. However, the end of the steel pipe that constitutes the pipe roof enters the tunnel more than the inner end of the main girder of the segment, and a guide member is retrofitted to the end, which is also from the inner end of the main girder. Since they are also present in the tunnel, there is a good possibility that these projecting members in the tunnel will violate the building limits of the main structure in the tunnel. Therefore, after the completion of the main tunnel, it is necessary to remove the temporary members protruding in these tunnels, and it may be necessary to finish the surface of the air surface inside the tunnel after the removal. It will lead to a long period of time and soaring construction costs. In addition, the removal of temporary members involves the risk of deformation and flooding of the main structure. And this problem becomes more remarkable as the extension of the starting tunnel (and thus the extension of the pipe roof) becomes longer.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a connection structure between a pipe roof and a start-side tunnel that does not generate a temporary member that needs to be removed after the completion of the main structure in the start-side tunnel. It is supposed to be.

In order to achieve the above object, one aspect of the connection structure between the pipe roof and the starting side tunnel according to the present invention is a pipe made of a steel pipe bridged between the starting side tunnel and the reaching side tunnel arranged side by side in the ground. It is a connection structure between the roof and the starting tunnel.
An accommodating opening formed in a segment constituting the starting tunnel and accommodating an end portion of the steel pipe constituting the pipe roof, at a position on the ground side of the inner end surface of the main girder of the segment. With a containment opening having an endless flange,
It has a mating endless flange that has a linearity complementary to the endless flange and forms a waterproof structure with the endless flange, and is on the ground side of the inner end surface of the main girder of the segment. A transmission member disposed at a position and transmitting the axial force from the steel pipe to the accommodation opening.
It is characterized by including at least a concrete body interposed from the inside of the steel pipe to the frame-shaped transmission member.

According to this aspect, a transmission member that transmits the axial force from the steel pipe to the accommodating opening provided in the segment is arranged at a position on the ground side of the inner end surface of the main girder of the segment (the girder of the main girder). (Arranged in the height) eliminates the problem that the temporary member protrudes into the tunnel after the construction of the main structure in the starting side tunnel is completed, and it is possible to eliminate the need to remove the temporary member. Therefore, this transmission member can be used not only as a temporary member but also as a permanent member. Here, the accommodating opening formed in the segment also has an endless flange, and the endless flange and the mating endless flange of the transmission member come into surface contact in a frame shape, and sufficient stopping is performed at this surface contact point. A water structure can be formed. A standard sealing material may be interposed at the contact surface between the endless flange and the mating endless flange. In the connection structure of this embodiment, since the concrete body is continuously formed from the inside of the steel pipe to the transmission member, the axial force acting from the end of the steel pipe constituting the pipe roof is transmitted through the concrete body. It is transmitted to the transmission member and is transmitted from the transmission member to the main girder of the segment through the accommodating opening fixed to the segment. Further, since the end portion of the steel pipe is accommodated in the segment (inside the accommodating opening), the shearing force acting through the accommodating opening can be countered by the main girder. It should be noted that the concrete body can transmit the axial force of the pipe roof to the main girder of the segment as long as it is formed from the inside of the end of the steel pipe in the accommodation opening to the transmission member. However, for example, a concrete body may be formed from the tip of the pipe roof on the reaching side tunnel side to the transmission member. Since the concrete body is formed in the steel pipe over the entire area of the pipe roof in this way, a connection structure having a highly rigid pipe roof can be obtained.

Further, another aspect of the connection structure between the pipe roof and the starting side tunnel according to the present invention is a pipe roof and a starting side made of a steel pipe bridged between the starting side tunnel and the reaching side tunnel arranged side by side in the ground. It ’s a tunnel connection structure.
An accommodating opening formed in a segment constituting the starting tunnel and accommodating an end portion of the steel pipe constituting the pipe roof, at a position on the ground side of the inner end surface of the main girder of the segment. With a containment opening having an endless flange,
A hollow cap member fitted in the endless flange, which has a linear shape complementary to the endless flange and forms a water blocking structure with the endless flange. Further, a shear key member that enters the inside of the steel pipe at the end face on the steel pipe side is further provided, and is disposed at a position on the ground side of the inner end face of the main girder of the segment to apply the axial force from the steel pipe. The cap member that transmits to the accommodation opening and
It is characterized by including at least a concrete body interposed from the inside of the steel pipe to the cap member.

According to this aspect, the shear key member of the cap member fitted to the endless flange of the accommodating opening has entered the inside of the steel pipe forming the pipe roof, which is caused by the axial force acting from the steel pipe. The shear force can also be counteracted by the shear key member. Therefore, as described above, by accommodating the end of the steel pipe in the accommodating opening in the segment, in addition to countering the shearing force acting through the accommodating opening to the main girder, this shearing force. Can be countered by the shear key member, so that a connection structure having a higher shear resistance can be provided. Further, also in this cap member, the endless flange of the accommodating opening formed in the segment and the mating endless flange of the cap member are in surface contact in a frame shape, and sufficient stopping is performed at this surface contact point. A water structure can be formed. Further, in a state where the cap member is fitted and fixed to the endless flange of the accommodation opening, the cap member is arranged at a position on the ground side of the inner end surface of the main girder of the segment (main girder). Since it is arranged within the girder height), it is possible to eliminate the problem that the temporary member protrudes into the tunnel after the construction of the main structure in the starting side tunnel is completed, and it is possible to eliminate the need to remove the temporary member. Therefore, like the transmission member, this cap member can be used not only as a temporary member but also as a main member.

Further, one aspect of the method of connecting the pipe roof and the starting side tunnel according to the present invention is a pipe roof and a starting side tunnel made of steel pipes bridged between the starting side tunnel and the reaching side tunnel arranged side by side in the ground. It is a connection method of the pipe roof and the starting side tunnel to connect
An accommodating opening formed in a segment constituting the starting-side tunnel and accommodating an end portion of the steel pipe constituting the pipe roof, at a position on the ground side of the inner end surface of the main girder of the segment. An accommodating opening having an endless flange is provided with a mating endless flange having a alignment complementary to the endless flange and forming a waterproof structure with the endless flange. A starting port of the steel pipe, to which a transmission member for transmitting the axial force from the steel pipe to the accommodation opening is attached, and the transmission member is arranged at a position on the ground side of the inner end surface of the main girder of the segment. Preparation, steel pipe start port preparation process,
A steel pipe propulsion step in which a steel pipe is propelled from the starting port of the starting tunnel to the front of the reaching tunnel to construct a pipe roof, and the end of the steel pipe forming the pipe roof is fastened in the accommodating opening.
A plate material is attached to the transmission member, and concrete is filled into at least the steel pipe from the starting side tunnel through the filling hole of the plate material to form a concrete body, and at least with the end portion of the steel pipe. It is characterized by comprising a concrete body forming step of integrating the transmission member with a concrete body.

According to this aspect, a transmission member is arranged at a position on the ground side of the inner end surface of the main girder of the segment, and the end portion of the steel pipe constituting the pipe roof and the transmission member are integrated with a concrete body. Temporary members such as transmission members and steel pipes constituting the pipe roof can be eliminated from protruding into the tunnel after the construction of the main structure in the starting side tunnel is completed, and the removal of the temporary members can be eliminated. In the steel pipe propulsion process, the method of fastening the end of the steel pipe forming the pipe roof in the accommodating opening is to set the length (arc length) of each steel pipe in advance so that the end of the steel pipe is positioned in the accommodating opening. It is enough to adjust. However, in addition to such a setting method, when the steel pipe protrudes into the starting tunnel when the construction of the pipe roof is completed, the protruding portion is cut and the end portion of the steel pipe is inserted into the accommodating opening. Construction may be performed such as positioning. When propelling a steel pipe while ensuring water stoppage in the steel pipe propulsion process, for example, a water stop member is arranged around the start port of the steel pipe, and the steel pipe is propelled while sliding the steel pipe on the water stop member. The construction method can be mentioned. In such a construction method, when the construction of the pipe roof is completed, the steel pipe tends to protrude into the starting tunnel. Therefore, in such a construction method, it is preferable to cut the protruding portion of the steel pipe protruding into the starting tunnel and position the end portion of the steel pipe in the accommodating opening.

Further, another aspect of the method of connecting the pipe roof and the starting side tunnel according to the present invention is the pipe roof and the starting side made of a steel pipe bridged between the starting side tunnel and the reaching side tunnel arranged side by side in the ground. It is a method of connecting the pipe roof and the starting tunnel, which connects the tunnels.
An accommodating opening formed in a segment constituting the starting tunnel and accommodating an end portion of the steel pipe constituting the pipe roof, at a position on the ground side of the inner end surface of the main girder of the segment. A steel pipe start port preparation step of removing the skin plate at a position corresponding to the accommodation opening having the endless flange to prepare the start port of the steel pipe, and
A steel pipe propulsion step in which a steel pipe is propelled from the starting port of the starting tunnel to the front of the reaching tunnel to construct a pipe roof, and the end of the steel pipe forming the pipe roof is fastened in the accommodating opening.
A mating endless flange having a alignment complementary to the endless flange of the accommodating opening and forming a water blocking structure with the endless flange is provided, and a shear key member is provided on the end face on the steel pipe side. A cap member installation step of attaching the cap member further to the accommodation opening and arranging the cap member at a position on the ground side of the inner end surface of the main girder of the segment.
A plate material is attached to the cap member, and concrete is filled into at least the steel pipe from the starting side tunnel through the filling hole of the plate material to form a concrete body, and at least with the end portion of the steel pipe. It is characterized by comprising a concrete body forming step of integrating the cap member with a concrete body.

According to this aspect, a cap member provided with a shear key member that enters the inside of the steel pipe is fitted and fixed in a housing opening fixed to the segment, and the cap member and the end of the steel pipe are integrated with a concrete body. By changing the structure, it is possible to form a connection structure having a higher shear resistance against the shear force caused by the axial force acting on the steel pipe. In addition, since this cap member is also arranged at a position on the ground side of the inner end surface of the main girder of the segment, the cap member, the steel pipe, etc. constituting the cap member and the pipe roof after the construction of the main structure in the starting side tunnel is completed. It is possible to eliminate the protrusion of the temporary member from the inside of the tunnel, and it is possible to eliminate the need to remove the temporary member.

Further, another aspect of the method of connecting the pipe roof and the starting side tunnel according to the present invention is characterized in that, in the concrete body forming step, concrete is filled up to the steel pipe at the tip of the reaching side tunnel side.
According to this aspect, it is possible to form a connection structure having a highly rigid pipe roof in which all the steel pipes constituting the pipe roof are reinforced with a concrete body.

Further, in another aspect of the method of connecting the pipe roof and the starting side tunnel according to the present invention, in the steel pipe propulsion process, the steel pipe is used while digging the ground with a digging machine having a multi-stage folding mechanism and capable of curved construction. Perform promotion,
Prior to the concrete body forming step, the excavator is reduced in diameter and pulled back into the starting tunnel via the steel pipe for recovery.
According to this aspect, the excavator having a breaking mechanism for propelling the steel pipe for the pipe roof is reduced in diameter after the propelling of the steel pipe is completed, and the excavator is operated on the starting side tunnel side at the stage before filling the concrete. By recovering, the recovered excavator can be diverted to the propulsion construction of the steel pipe of the pipe roof to be constructed next.

According to the connection structure between the pipe roof and the starting side tunnel of the present invention, it is possible to eliminate the need to remove the temporary member after the completion of the main structure in the starting side tunnel.

It is sectional drawing explaining the temporary structure of the merging part of a road tunnel which has the connecting structure of the pipe roof and the starting side tunnel which concerns on embodiment of this invention. It is a perspective view which saw an example of the connection structure of the pipe roof and the starting side tunnel which concerns on 1st Embodiment of this invention from the inside sky side of a starting side tunnel. It is a schematic diagram explaining that the accommodating opening and the main girder oppose the shearing force acting due to the axial force from the steel pipe. FIG. 3 is a perspective view of an example of a connection structure between a pipe roof and a starting-side tunnel according to a second embodiment of the present invention, as viewed from the inner sky side of the starting-side tunnel. It is a schematic diagram explaining that the shearing key member of a cap member opposes the shearing force acting due to the axial force from a steel pipe. It is a process drawing explaining an example of the connection method of the pipe roof and the starting side tunnel which concerns on embodiment of this invention. It is a process diagram following FIG. It is a process diagram following FIG. It is a process diagram following FIG.

Hereinafter, the connection structure and connection method between the pipe roof and the starting tunnel according to the embodiment of the present invention will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components are designated by the same reference numerals to omit duplicate explanations.

[Connection structure between the pipe roof and the starting tunnel according to the embodiment]
<Temporary structure of the junction of road tunnels>
First, with reference to FIG. 1, a temporary structure of a junction of road tunnels, which includes a connection structure between a pipe roof and a starting-side tunnel according to an embodiment, will be described. FIG. 1 is a cross-sectional view illustrating a temporary structure of a junction portion of a road tunnel having a connection structure between a pipe roof and a start-side tunnel according to an embodiment of the present invention. As shown in FIG. 1, the temporary structure of the junction of the road tunnels is a ramp tunnel 100 with a relatively small cross section and a main tunnel 200 with a relatively large cross section, which are constructed side by side at intervals in the ground. And a pipe roof 300 bridged between both tunnels above the ramp tunnel 100 and the main tunnel 200. Further, at a position below the ramp tunnel 100 and the main tunnel 200, a preceding temporary lower receiving 400 straddling between both tunnels is further provided. Further, both the ramp tunnel 100 and the main tunnel 200 have a vertical support 60 extending in the vertical direction starting from the intersection with the pipe roof 300 in the tunnel, and each configuration described above has a temporary structure. It is a basic configuration. Even at the lower positions of the ramp tunnel 100 and the main tunnel 200, the lower pipe roof 300A indicated by the alternate long and short dash line may be constructed as needed, and if the lower pipe roof 300A is constructed, this is also a temporary structure. It becomes a component of.

Although it is not a temporary structure, an upper diagonal support 70 and a lower diagonal support 80 are constructed in the ramp tunnel 100 and the main tunnel 200, respectively, at the temporary stage. All of these members are located on the outer peripheral side of the building limit in the drawing, and can be members buried in concrete or the like constructed on the outer peripheral side of the building limit. The upward diagonal support 70 extends in the direction along the axis of the main ceiling curved receiver 700 of the main tunnel shown by the alternate long and short dash line in the figure, and exerts the axial force acting from the main ceiling curved receiver 700 after the main tunnel is put into service. It is a member to escape. On the other hand, the downward diagonal support 80 extends in a direction along the axis of the main downward curved receiver 800 of the main tunnel shown by the alternate long and short dash line in the figure, and acts from the main downward curved receiver 800 after the main tunnel is put into service. It is a member that releases force.

Both the main tunnel 200 and the ramp tunnel 100 are constructed by the shield method, and a plurality of segments 20 are connected in the ring direction to form a segment ring, and a plurality of segment rings are connected in the axial direction of the tunnel. A tunnel is formed over a predetermined extension. Each segment 20 includes a plurality of curved main girders 21 extending in the circumferential direction, a skin plate 24 welded to the outer peripheral surface of the main girder 21, and the main girder 21 at the circumferential end of the main girder 21. It has a joint plate 22 connected to the skin plate 24 by welding, and a vertical rib 23 that connects the main girders 21 to each other to reinforce the segment 20.

Of the main line tunnel 200 and the ramp tunnel 100, a recess 25 is provided in advance with respect to the segment 20 at a position where the end portion of the preceding temporary lower receiver 400 is fitted. For example, the recess 25 is made of concrete or the like at the beginning of tunnel construction. It is blocked by. The details of the construction method will be omitted, but for example, a digging machine having a bending mechanism and having a bending mechanism and capable of curved construction is started from the recessed portion 25 (starting portion) of the ramp tunnel 100, and the steel pipe 50 is propelled while digging the ground. By executing and connecting the steel pipes 50 to each other, the preceding temporary lower support 400 is constructed. In this construction, the excavator applied to the propulsion of the steel pipe reaches the recess 25 of the main tunnel 200, completes the construction of the preceding temporary lower receiving 400, and then reduces the diameter, for example, to reduce the diameter of the preceding temporary lower receiving 400. It is preferable that the steel pipes 50 are pulled back into the starting tunnel 100 via the inside of the plurality of steel pipes 50 and recovered.

Further, in the main line tunnel 200 and the ramp tunnel 100, recessed portions 26 and 27 are provided in advance in the segment 20 where the ends of the main ceiling curved receiver 700 and the main downward curved receiver 800 are connected, respectively. ..

The pipe roof 300 has a ramp tunnel 100 as a starting tunnel, and extends from the ramp tunnel 100 to the front of the main tunnel 200, which is the reaching tunnel, with a curved line while sequentially propelling the steel pipe 30. The ramp tunnel 100 may be the arrival side tunnel, and the main line tunnel 200 may be the start side tunnel. Further, a linear pipe roof may be constructed. Here, "in front of the reaching side tunnel" means that, in the illustrated example, the tip 31 of the leading steel pipe 30 forming the pipe roof 300 does not reach the reaching side tunnel 200 and stays in the back ground G of the tunnel. However, in addition to this form, the tip 31 of the leading steel pipe 30 may be in contact with the reaching tunnel 200. In any form, it is required that the tip 31 of the leading steel pipe 30 forming the pipe roof 300 does not penetrate the reaching side tunnel 200.

On the starting side tunnel 100 side, among the plurality of steel pipes 30 constituting the pipe roof 300, they are fixed to the end portion 32 of the steel pipe 30 located at the rear end and the steel accommodating opening fixed to the segment 20. A connection structure 600 between the pipe roof and the starting side tunnel is formed by the transmission member 10 or the cap member 17 and the concrete body 40 connecting the end portion 32 of the steel pipe 30 and the transmission member 10 or the cap member 17. .. The connection structure 600 will be described in detail below. On the other hand, on the reaching side tunnel 200 side, the steel pipe 30 whose tip 31 is stopped in front of the reaching side tunnel 200, the steel protruding portion protruding from the segment 2 into the ground G, and the tip 31 of the steel pipe 30. The concrete body 40, which is integrated with the steel protrusion, forms a connection structure 500 between the pipe roof and the reaching tunnel. In addition, in this specification, the detailed description of the connection structure 500 of the pipe roof and the reaching side tunnel is omitted.

In the temporary structure of the junction of the road tunnels in the illustrated example, the ground is not improved in the back ground G of the ramp tunnel 100 and the main tunnel 200. This is because there is no need for workers to enter the back ground G to construct the connection structure 600 for the pipe roof and the starting tunnel, but the ground conditions, groundwater conditions, workability and construction costs are not required. In consideration of the above, appropriate ground improvement work may be performed in the back ground G of the ramp tunnel 100 and the main tunnel 200, and the connection method according to this embodiment completely eliminates the ground improvement work. is not it.

<Connecting structure of the pipe roof and the starting tunnel according to the first embodiment>
Next, with reference to FIGS. 2 and 3, the connection structure between the pipe roof and the starting tunnel according to the first embodiment of the present invention will be described. FIG. 2 is a perspective view of an example of the connection structure between the pipe roof and the starting side tunnel according to the first embodiment of the present invention, as viewed from the inner sky side of the starting side tunnel. Further, FIG. 3 is a schematic view illustrating that the accommodation opening and the main girder oppose the shearing force acting due to the axial force from the steel pipe. Note that FIG. 2 is a perspective view of the concrete body 40 in order to facilitate understanding of the connection structure.

In the region of the starting-side tunnel 100 forming the connection structure 600, the skin plate 24 at the position corresponding to the propulsion starting port 24a of the steel pipe 30 constituting the pipe roof 300 has been removed to form the segment 20. A steel tubular accommodating opening 28 is connected to the main girder 21 by welding. A steel endless flange 29 is fixed to the end of the accommodation opening 28 on the inner side of the tunnel so as to project outside the accommodation opening 28. As shown in FIG. 2, the axis of the accommodation opening 28 coincides with the axis of the pipe roof 300, and the endless flange 29 extends in a direction orthogonal to these axes. The endless flange 29 arranged at the lower end of the accommodation opening 28 is arranged on the ground side (within the girder height of the main girder 21) with respect to the inner end surface of the main girder 21 of the segment 20.

A transmission member 10 is fixed to the endless flange 29 of the accommodation opening 28 by welding or bolts. The transmission member 10 includes a mating endless flange 11 having a linearity complementary to the endless flange 29 of the accommodating opening 28 and forming a water blocking structure with the endless flange 29, and has an end portion. Is provided with a stiffening rib 12. The transmission member 10 is also arranged at a position on the ground side of the inner end surface of the main girder 21 of the segment 20. The steel pipe 30 is propelled into the ground G through the opening 11a of the mating endless flange 11 of the transmission member 10, but after the pipe roof 300 is constructed, the steel plate material 13 is welded and fixed to the opening 11a. Will be done. The plate material 13 is provided with a filling hole 13a in which a filling hose (or a filling pipe) applied when filling the steel pipe 30 with fresh concrete for creating a concrete body 40 is provided, and a filling hole 13a is provided to form the concrete body 40. After that, the filling hole 13a is closed as shown in FIG.

The endless flange 29 of the accommodating opening 28 and the endless flange 11 on the mating side of the transmission member 10 are in surface contact with each other. A water structure is formed.

In this way, the accommodation opening 28 fixed to the main girder 21 of the segment 20, the transmission member 10 fixed to the endless flange 29 of the accommodation opening 28, and the end of the steel pipe 30 constituting the pipe roof 300. The connection structure 600 between the pipe roof and the starting side tunnel is formed by the 32 and the concrete body 40 interposed from the inside of the steel pipe 30 to the transmission member 10.

As shown in FIG. 3, in the connection structure 600, the axial force N from the pipe roof 300 acting from the end portion 32 of the square steel pipe 30 is transmitted to the transmission member 10 in the Y1 direction via the concrete body 40, and the transmission member It is transmitted from 10 to the main girder 21 to which the accommodation opening 28 is fixed via the accommodation opening 28. Further, since the endless flange 29 and the mating endless flange 11 extend in a direction orthogonal to the axial force N and are in surface contact with each other, the pressing force N1 due to the axial force N causes a surface. The contact portion is pressed and a high waterproof structure is formed. Further, since the end portion 32 of the steel pipe 30 is accommodated in the accommodating opening 28 fixed to the main girder 21 of the segment 20, the shearing force S acting due to the axial force N is accommodated in the accommodating opening. It can be opposed by the main girder 21 via the portion 28.

Further, the transmission member 10 for transmitting the axial force N from the steel pipe 30 to the accommodating opening 28 provided in the segment 20 is arranged at a position on the ground side of the inner end surface of the main girder 21 of the segment 20. As a result, the temporary member does not protrude into the tunnel after the construction of the main structure in the starting side tunnel 100 is completed, and the removal of the temporary member can be eliminated. Therefore, the transmission member 10 and the like can be used not only as a temporary member but also as a main member.

<Connecting structure of the pipe roof and the starting tunnel according to the second embodiment>
Next, with reference to FIGS. 4 and 5, the connection structure between the pipe roof and the starting tunnel according to the second embodiment of the present invention will be described. FIG. 4 is a perspective view of an example of the connection structure between the pipe roof and the starting side tunnel according to the second embodiment of the present invention as viewed from the inner sky side of the starting side tunnel. Further, FIG. 5 is a schematic diagram illustrating that the shear key member of the cap member opposes the shear force acting due to the axial force from the steel pipe. As in FIG. 2, FIG. 4 is also a perspective view of the concrete body 40 in order to facilitate understanding of the connection structure.

In the present embodiment, instead of the transmission member 10, a steel cap portion 17 is fitted and fixed to the endless flange 29 of the accommodation opening 28. The cap member 17 has a cylindrical portion 14 having a hollow, a mating endless flange 15 forming a waterproof structure between the endless flange 29 and the endless flange 29 having a linear shape complementary to the endless flange 29, and stiffening. It has a rib 16. As shown in FIG. 5, the cap member 17 further has a steel end plate material 18 on the end face on the steel pipe 30 side, and the end plate material 18 has a shear key member 19 that enters the inside of the steel pipe 30. Is fixed by welding. The shear key member 19 has a steel pipe key member 19A and a shaped steel key member 19B disposed in the steel pipe key member 19A. Then, in a state where the cap member 17 is fitted and fixed to the endless flange 29 of the accommodation opening 28, the cap member 17 is on the ground side (the girder height of the main girder 21) with respect to the inner end surface of the main girder 21 of the segment 20. (Inside).

The steel pipe 30 is propelled into the ground G through the hollow of the tubular portion 14 of the cap member 17, but after the pipe roof 300 is constructed, the steel plate material 13 is welded to the tunnel side end surface of the tubular portion 14. It is fixed. The plate material 13 is provided with a filling hole 13a in which a filling hose (or a filling pipe) applied when filling the steel pipe 30 with fresh concrete for creating a concrete body 40 is provided, and a filling hole 13a is provided to form the concrete body 40. After that, the filling hole 13a is closed as shown in FIG.

In this way, the accommodating opening 28 fixed to the main girder 21 of the segment 20, the cap member 17 fitted and fixed to the endless flange 29 of the accommodating opening 28, and the steel pipe 30 constituting the pipe roof 300 are formed. A connection structure 600 between the pipe roof and the starting side tunnel is formed by the end portion 32 of the steel pipe 30 and the concrete body 40 interposed from the inside of the steel pipe 30 over the cap member 17.

As shown in FIG. 5, in the connection structure 600, the axial force N from the pipe roof 300 acting from the end portion 32 of the square steel pipe 30 is transmitted to the cap member 17 in the Y2 direction via the concrete body 40, and the cap member It is transmitted from 17 to the main girder 21 to which the accommodation opening 28 is fixed via the accommodation opening 28. Further, since the endless flange 29 and the mating endless flange 15 extend in a direction orthogonal to the axial force N and are in surface contact with each other, the surface is subjected to the pressing force N1 caused by the axial force N. The contact portion is pressed and a high waterproof structure is formed.

Further, since the steel pipe key member 19A and the shaped steel key member 19B constituting the shear key member 19 are arranged in the steel pipe 30 from the end portion 32 of the steel pipe 30 and embedded in the concrete body 40, the pipe roof 300 The shear force S caused by the axial force N from the steel pipe 30 forming the steel pipe 30 can be counteracted by the shear key member 19. That is, as described in the first embodiment, since the end portion 32 of the steel pipe 30 is accommodated in the accommodating opening 28, the shearing force S is countered by the main girder 21 via the accommodating opening 28. In addition to being able to be made to oppose, the shear key member 19 can also be made to oppose, so that the connection structure 600 having an even higher shear resistance is formed.

Further, the cap member 17 that transmits the axial force N from the steel pipe 30 to the accommodating opening 28 provided in the segment 20 is arranged at a position on the ground side of the inner end surface of the main girder 21 of the segment 20. As a result, the temporary member does not protrude into the tunnel after the construction of the main structure in the starting side tunnel 100 is completed, and the removal of the temporary member can be eliminated. Therefore, the cap member 17 and the like can be used not only as a temporary member but also as a main member.

[Method of connecting the pipe roof and the reaching tunnel according to the embodiment]
Next, an example of the connection method between the pipe roof and the starting tunnel according to the embodiment of the present invention will be described with reference to FIGS. 6 to 9. Here, FIGS. 6 to 9 are process diagrams illustrating an example of a method of connecting the pipe roof and the starting tunnel according to the embodiment of the present invention in order. In this embodiment, the method of forming the connection structure 600 according to the second embodiment shown in FIGS. 4 and 5 described above will be described, but the first embodiment shown in FIGS. 2 and 3 will be described. It may be a method of forming the connection structure 600. In this connection method, as shown in FIG. 1, it is assumed that the construction of the starting side tunnel 100 and the reaching side tunnel 200 by the shield method has been completed. Here, in the ground around the starting side tunnel 100 and the reaching side tunnel 200 in FIG. 1, ground improvement construction is not essential, but before and after the construction of the starting side tunnel 100 and the reaching side tunnel 200, and the pipe roof 300. Appropriate ground improvement construction may be carried out at the stage before construction.

As shown in FIG. 6, a start port 24a is formed in the segment 20 constituting the start side tunnel 100, and the steel pipe 30 forming the pipe roof 300 is propelled in the ground G in the Z direction through the start port 24a. Let me. More specifically, the accommodation opening 28 for accommodating the end 32 of the steel pipe 30 constituting the pipe roof 300, and the endless flange 29 is provided at a position on the ground side of the inner end surface of the main girder 21 of the segment 20. A housing opening 28A having a removable endless flange 29A and extending into the tunnel is attached to the housing opening 28. A water stop material 29B having a notch so that the steel pipe 30 can be propelled is attached from the endless flange 29 over the accommodation opening 28A, and the skin plate 24 at a position corresponding to the accommodation opening 28 is removed (steel pipe start port preparation step). ).

Then, the steel pipe 30 is sequentially propelled into the ground while sliding the steel pipe 30 on the water blocking material 29A, and the tip 31 thereof is stopped at the back ground G in front of the reaching side tunnel 200 to start the pipe roof 300. It is bridged between the side tunnel 100 and the reaching side tunnel 200 (steel pipe propulsion process).

In the construction of the pipe roof 300, the steel pipe 30 is propelled while digging the ground G with a digging machine (not shown) having a bending mechanism and corresponding to curved construction. When the excavator reaches the front of the arrival side tunnel 200 and the tip 31 of the steel pipe 30 in front reaches the front of the arrival side tunnel 200, the diameter of the excavator is reduced and each steel pipe 30 forming the pipe roof 300 is formed. The excavator whose diameter has been reduced is pulled back into the tunnel 100 on the starting side and collected. In this way, by recovering the excavator in the starting side tunnel 100, the excavator recovered at the time of propulsion construction of the steel pipe 30 to be constructed next can be diverted.

Next, as shown in FIG. 7, the accommodation opening 28A extending into the tunnel is removed from the accommodation opening 28. Next, a mating endless flange 15 is provided which forms a waterproof structure between the endless flange 29 having the accommodation opening 28 fixed to the segment 20 and the endless flange 29 having a complementary alignment. A cap member 17 further provided with a shear key member 19 on the end surface on the steel pipe 30 side is fitted into the accommodating opening 28, and the mating endless flange 15 is attached to the endless flange 29 via welding or bolts. With the cap member 17 attached, the cap member 17 is arranged on the ground side (within the girder height of the main girder 21) from the inner end surface of the main girder 21 of the segment 20 (cap member installation step). As shown in the figure, a steel plate material 13 is fixed to the end surface of the cap member 17 on the empty side of the tunnel by welding, and the plate material 13 is provided with hoses and pipes for filling concrete. It has a filling hole 13a.

Next, as shown in FIG. 8, a hose H is attached to the filling hole 13a of the plate material 13, and concrete is filled into the steel pipe 30 forming the pipe roof 300 from the starting side tunnel 100. Here, a plurality of openings 18a are opened in the end plate material 18, and the filled concrete flows into the steel pipe 30 side in the Y3 direction through the openings 18a. Further, it also flows into the ground G outside the steel pipe 30 in the Y3 direction.

The concrete may be filled only in one steel pipe 30 located on the starting side tunnel 100 side among the plurality of steel pipes 30 constituting the pipe roof 300, or the pipe roof 300 may be filled. A method may be used in which the steel pipe 30 at the tip on the arrival side tunnel 200 side is filled over the entire area. According to the former method, the connection structure 600 can be constructed with the minimum amount of concrete. On the other hand, according to the latter method, a high-strength pipe roof 300 can be constructed over the entire area, and a connection structure 500 between the pipe roof and the reaching tunnel can also be constructed. In either method, at least the end portion 32 of the steel pipe 30 and the cap member 17 can be integrally connected to each other in the concrete body 40 constituting the starting side tunnel 600.

As shown in FIG. 9, when the filled concrete is hardened, it is fitted and fixed to the accommodating opening 28 fixed to the main girder 21 of the segment 20 and the endless flange 29 of the accommodating opening 28. The connection structure 600 between the pipe roof and the starting side tunnel is provided by the cap member 17, the end portion 32 of the steel pipe 30 constituting the pipe roof 300, and the concrete body 40 interposed from the inside of the steel pipe 30 to the cap member 17. Is constructed (concrete body construction process).

According to the illustrated connection method, since the cap member 17 is arranged at a position on the ground side of the inner end surface of the main girder 21 of the segment 20, the cap is capped after the construction of the main structure in the starting side tunnel 100 is completed. Temporary members such as the member 17 and the steel pipe 30 constituting the pipe roof 300 can be prevented from protruding into the tunnel, and the removal of the temporary member can be eliminated. Further, the cap member 17 provided with the shear key member 19 that enters the inside of the steel pipe 30 is fitted and fixed to the endless flange 29 of the accommodating opening 28 fixed to the segment 20, and the cap member 17 and the steel pipe 30 are fixed. By integrating the end portions 32 with the concrete body 40, it is possible to form a connection structure 600 having a high shear resistance against the shear force caused by the axial force acting from the steel pipe 30 forming the pipe roof 300. ..

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. .. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

10: Transmission member, 11: Endless flange on the mating side, 12: Stiffening rib, 13: Plate material, 13a: Filling hole, 14: Tube, 15: Endless flange on the mating side, 16: Stiffening rib, 17: Cap member, 18: end plate material, 19: shear key member, 19A: steel pipe key member, 19B: shaped steel key member, 20: segment, 21: main girder, 22: joint plate, 23: vertical rib, 24: Skin plate, 24a: Start port, 28: Storage opening, 29: Endless flange, 30: Steel pipe (square steel pipe), 31: Tip, 32: End (rear end), 40: Concrete body, 50: Steel pipe ( Square steel pipe), 60: Vertical support, 70: Upward diagonal support, 80: Downward diagonal support, 100: Starting side tunnel (ramp tunnel), 200: Reaching side tunnel (main line tunnel), 300: Pipe roof, 400 : Preceding temporary lower receiver, 500: Connection structure (connection structure between pipe roof and reaching side tunnel), 600: Connection structure (connection structure between pipe roof and starting side tunnel), 700: Main ceiling curved receiver, 800: Main installation Downward curved receiving, G: Ground (back ground)

Claims (2)

It is a connection structure between the starting side tunnel and the pipe roof made of steel pipes that are laid between the starting side tunnel and the reaching side tunnel that are juxtaposed in the ground.
A housing opening formed in a segment constituting the starting tunnel and accommodating an end portion of the steel pipe constituting the pipe roof, from the inner end surface within the range of the girder height of the main girder of the segment. With an accommodation opening that has an endless flange at the position on the outer peripheral side ,
It has a mating endless flange that has a linearity complementary to the endless flange and forms a waterproof structure with the endless flange, and is inside within the girder height range of the main girder of the segment. A transmission member disposed at a position on the outer peripheral side of the end face and transmitting the axial force from the steel pipe to the accommodation opening.
It is provided with at least a concrete body interposed from the inside of the steel pipe to the transmission member .
The plate material fixed so that the opening of the endless flange on the mating side is closed is filled with a filling hose or filling applied when the inside of the steel pipe is filled with fresh concrete for forming the concrete body. A connection structure between the pipe roof and the starting tunnel, characterized by the opening of a filling hole into which a pipe is inserted or mounted . Within the range of the girder height of the main girder of the segment, the space formed by the accommodating opening and the plate material is filled with concrete to form a part of the concrete body. The connection structure between the pipe roof and the starting tunnel according to claim 1.

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