JPH0523633Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a method for connecting an underground shield tunnel to a manhole or the like above ground with a branch steel pipe.
This relates to a connection socket that suppresses the effects of stress generated in a shield tunnel and minimizes the need for reinforcement.

(Conventional technology) Conventional technology includes connecting a telephone cable tunnel to a branch manhole, and connecting a traffic tunnel to a ventilation system installed on the ground surface, all of which involve building a vertical hole (connecting shaft). However, at the joints between the tunnel and the vertical hole, and between the manhole and the vertical hole, reinforcing bars are inserted into the secondary lining of the tunnel section and the lower slab of the manhole, creating a rigid structure as shown in Figure 9. There is. Therefore, the external force acting on the branching steel pipe, manhole, etc. acts on the tunnel etc. using the branching steel pipe itself as a medium, and a large force acting on the cross section is generated.

Therefore, large-scale reinforcement is required for tunnels and the like, which poses problems in terms of reinforcement work in tunnels with limited work space and economic efficiency.

A specific construction method for a conventional rigid structure will be described below.

As shown in FIG. 9, there is a vertical hole 3 above the shield segment 15 that constitutes the shield tunnel 30 fixed in the ground 14 through the backing material 13.
1 is formed, and the lower end is a shield tunnel 3.
On the inner surface of the hollow cylinder 16 that reaches directly above the
7 through the lining 18 of the shield segment 15
A retaining wall 19 is formed to connect to the earth retaining wall 19. A water stop material 20 is placed between the inner wall of the lower end of the vertical hole 31 and the outer surface of the lower end of the hollow cylinder 16 (11th
(see figure), a poor mix mortar 21 is cast between the inner wall of the vertical hole 31 located above the water stop material 20 and the outer surface of the hollow cylinder 16. In addition, 22 in the figure
The ground 14 is created using a boring machine (not shown), etc.
This is a guide groove for drilling a vertical hole 31 from the ground surface 23 toward the shield tunnel 30, and 24 is the groundwater level. In order to construct the earth retaining wall 19 below this in a water-free state, first, a stabilizing liquid 26 such as fresh water, bentonite, or muddy water is used with a boring machine etc. to create a shield segment directly above the shield tunnel 30 that is to be connected to the ground surface 23. Drill holes into the backfill material 13 around 15 and
After holding the vertical hole 31 with the stabilizing liquid 26 as shown in FIG. An injection tube (not shown) is lowered into the stabilizing liquid 26 located between the outer surface of the hollow cylinder 16 and the inner wall of the vertical hole 31, and the lower end of the hollow cylinder 16, which contacts the bottom of the vertical hole 31, is filled with quick-setting mortar or packer. The water stop material 20 used is used to stop water and partition the inside and outside of the hollow cylinder 16.

Next, as shown in FIG. 10c, the stabilizing liquid 26 inside the inner wall of the hollow cylinder 16 is removed using a suction pump or the like, or a small hole is made in the shield segment 15 and inserted into the shield tunnel 30. After evacuation, an opening 27 is formed in the shield segment 15.
is provided to communicate between the shield tunnel 30 and the inside of the hollow cylinder 16. Here, the stabilizing liquid 26 that holds the inner wall of the vertical hole 31 is blocked by the hollow cylinder 16 and the water stop material 20, and the first
The reinforcing bars 17 are arranged as shown in Figure 0D. Thereafter, as shown in FIG. 10e, the inner form body 25 is installed in the opening 27 of the shield segment 15, concrete is poured, and the earth retaining wall 19 is successively moved upward while the inner form body 25 is moved upward. After pouring and forming, as shown in FIG. Mixed mortar 21 is poured and construction of vertical hole 31 is completed.

Figures 11 and 12 show the structure of a vertical hole constructed using the conventional earth retaining wall construction method.
Here, 28 is an underground storage tank, and 29 is a peeling material.

(Problem that the invention aims to solve) When connecting an underground shield tunnel and an above-ground manhole with a branching steel pipe, the conventional rigid connection has a problem in that the influence of external forces on the shield tunnel is There are major problems that require major reinforcement. In order to solve this problem, the present invention provides a connection socket that minimizes the influence of connecting branch steel pipes and only strengthens a minute area around the connection part.

(Means for solving the problem) In this invention, when connecting a shield tunnel and a branching steel pipe, a shield tunnel connecting socket is inserted from the tunnel side into the branching steel pipe that has been drilled from the ground side. However, by ensuring a gap of approximately 4 mm between the socket and the branching steel pipe along the circumferential direction of the socket, the bending moment generated in the tunnel due to external force acting on the branching steel pipe can be blocked by this gap. It has a hinge structure that
Keep reinforcement of the shield tunnel section to a minimum.

In addition, the connection socket of the present invention secures a gap of approximately 3 mm between the steel pipe for drilling and the socket when connecting the manhole on the ground side and the steel pipe for branching, and uses O-ring packing to maintain water tightness. , and has a telescopic structure that slides in the axial direction of the steel pipe, thereby absorbing external forces acting on the manhole and preventing external forces from being transmitted to the shield tunnel.

That is, the connection socket of the present invention includes a connection socket partially provided with a recess and an O-ring accommodated in the recess, and the connection socket is connected to the O-ring.
It is characterized in that the connection socket is fitted to the branching steel pipe via a ring and is displaceable or tiltable in the axial direction of the branching steel pipe.

Furthermore, the connection socket of the present invention is characterized in that it consists of an inner-wrap socket and an outer-wrap socket that are integrally constructed, and a recess is provided in the inner-wrap socket. It is characterized in that it includes a flange at one end for fixing to the opening of the shield tunnel.

Furthermore, the connecting socket of the present invention consists of an upper socket and a lower socket that are integrally constructed,
A recess is provided in the lower socket.

(Function) Unlike the conventional rigid structure in which the shield tunnel and steel pipe are rigidly connected using reinforcing bars, the connection socket of the present invention absorbs external force at the tunnel side connection part and the manhole side connection part, and directly connects the shield tunnel to the steel pipe. It has a structure that does not allow water to be transmitted to the tunnel, and uses an O-ring to provide water-stopping properties similar to a rigid structure.

(Example) Figures 1 to 3 are diagrams for explaining a connecting socket for a shield tunnel in an embodiment of the present invention, and Figure 4 is a partially enlarged view of the connecting socket for a shield tunnel shown in Figure 2. 1 is a connection socket for the shield tunnel, 2 is an O-ring for water stop,
3 is an inner socket, 4 is an outer socket, 5 is a steel flange, 6 is a branching steel pipe, and 7 is a shield tunnel.

To carry out this method, first insert the connecting socket 1 for the shield tunnel together with the O-ring 2 from the shield tunnel side into the branching steel pipe that has been drilled from the ground side, and then close the gap between the connecting socket 1 and the branching steel pipe 6. Connect while keeping approximately 4mm along the circumferential direction of the socket.

By doing this, compared to the conventional rigid structure, the connecting part acts as a hinge (the branching steel pipe can tilt freely), and the bending moment generated in the tunnel part due to external force acting on the branching steel pipe The shield tunnel is cut off by approximately 4 mm of water, minimizing the stress generated in the shield tunnel and requiring only a small area of reinforcement around the connection, and the O-ring provides the same water-tightness as a rigid structure. I try to have it.

5 to 7 are diagrams for explaining the manhole connection socket, and FIG. 8 is a partially enlarged view of the manhole connection socket shown in FIG. 6, where 8 is the manhole connection socket, 9 1 is an upper socket, 10 is a lower socket, 11 is an O-ring for stopping water, and 12 is a bottom plate of the manhole.

By doing this, compared to the conventional rigid structure, the connection part expands and contracts (it can be freely displaced in the axial direction of the branching steel pipe 6), so that the external force acting on the manhole is absorbed by the branching steel pipe. In addition to absorbing water so that it does not act directly on water and preventing it from being transmitted to the shield tunnel, the O-ring provides water-stopping properties similar to those of a rigid structure.

The shield tunnel connecting socket 1 can be slightly displaced in the axial direction of the branching steel pipe, and the manhole connecting socket 8 can be slightly tilted with respect to the branching steel pipe.

(Effects of the invention) As explained above, the connection socket of the invention is suitable for connecting shield tunnels and branching steel pipes.
Connecting sockets for shield tunnels that function as hinges, and connecting sockets for manholes that expand and contract to connect above-ground manholes and branching steel pipes, are used to prevent bending caused by external forces acting on the manholes and branching steel pipes. Since moments and forces acting in the axial direction are not generated in the shield tunnel, the stress generated in the shield tunnel can be dealt with by minimizing the reinforcement around the connection parts.
It also has excellent water-stopping properties, and has the advantage of being able to connect branching steel pipes by simply reinforcing a shield tunnel at low cost.

[Brief explanation of drawings]

Figure 1 is a perspective view of a connecting socket for a shield tunnel, Figure 2 is a sectional view of a connecting socket for a shield tunnel, Figure 3 is a plan view of a connecting socket for a shield tunnel, and Figure 4 is the same as Figure 2. 5 is a perspective view of the connection socket for a manhole, FIG. 6 is a sectional view of the connection socket for a manhole, and FIG. 7 is a plan view of the connection socket for a manhole. , FIG. 8 is a partially enlarged view of the connection socket for the manhole shown in FIG. 6, FIG. 9 is a sectional view of the connection part connecting the conventional shield tunnel and the vertical hole, and FIGS.
f is a process diagram showing the work procedure for constructing a vertical hole connecting the shield tunnel and the ground surface using the conventional method of constructing a retaining wall, and Figures 11 and 12 are diagrams showing the procedure for constructing a vertical hole connecting the shield tunnel and the ground surface using the conventional method of constructing a retaining wall. It is a sectional view showing the structure of the built vertical hole. 1... Connection socket for shield tunnel, 2
...Tunnel side O-ring, 3...Inner wrap socket, 4...Outer wrap socket, 5...Flange, 6
...Branching steel pipe, 7...Shield tunnel, 8...
... Connection socket for manhole, 9 ... Upper socket, 10 ... Lower socket, 11 ... Manhole side O-ring, 12 ... Manhole bottom plate, 1
3... Back filling material, 14... Earth, 15... Shield segment, 16... Hollow cylinder, 17... Reinforcing bar, 1
8... Lining, 19... Earth retaining wall, 20... Water stop material, 21... Poor mix mortar, 22... Guide groove,
23... Ground surface, 24... Groundwater level, 25... Inner formwork body, 26... Stabilizing liquid, 27... Opening, 28
...Underground storage tank, 29...Peeling material, 30...
Shield tunnel, 31... vertical hole.

Claims (1)

[Claims for Utility Model Registration] 1. A connecting socket for connecting an underground shield tunnel and an above-ground manhole using a branching steel pipe, the connecting socket comprising: a connecting socket having a recessed portion in part; and the recessed portion. and an O-ring accommodated in the branching steel pipe, and the connecting socket is fitted to the branching steel pipe via the O-ring, and the coupling socket is provided so as to be freely displaceable or tiltable in the axial direction of the branching steel pipe. A connecting socket for connecting an underground shield tunnel and an above-ground manhole using a steel pipe. 2. The utility model according to claim 1, wherein the connection socket is composed of an inner-wrap socket and an outer-wrap socket that are integrally constructed, and a recess is provided in the inner-wrap socket. A connection socket for connecting the inner shield tunnel and the above-ground manhole using a steel pipe. 3. An underground shield tunnel and an above-ground manhole according to claim 2 of the utility model, characterized in that one end of the outer wrapping socket includes a flange for fixing to the opening of the shield tunnel. Connection socket for connection. 4. The underground shield according to claim 1 of the utility model, wherein the connecting socket is composed of an upper socket and a lower socket that are integrally constructed, and a recess is provided in the lower socket. A connection socket for connecting a tunnel and an above-ground manhole using a steel pipe.