JPH04250294A - Lining method of shield tunnel and device thereof - Google Patents

Abstract

PURPOSE:To facilitate lining work of the inside of a shield tunnel and, at the same time, to reduce a construction period. CONSTITUTION:The inside of the rear end of a shield cylinder 10 of a shield excavator is shaped in a double cylinder, and segments 17 are assembled in an internal cylinder 11 to form a primary lining 18. A self-hardening outside lining material 21 is filled between the primary lining 18 pushed backward in the case the shield excavator is driven and a tunnel bedrock surface 20.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel lining method and apparatus for lining the inner surface of a tunnel excavated by a shield tunneling machine.

0002

[Prior Art] Conventionally, the lining of a shield tunnel has been carried out by assembling segments into a cylindrical shape within the rear end of the shield tube and pushing this segment backward during propulsion, as the tunnel is excavated by a shield tunneling machine. In addition to gradually extending the tunnel, filler is being injected between the ground and the primary lining in parallel with the excavation of the shield excavator.

In many cases, a secondary lining made of cast-in-place concrete is provided inside the primary lining made of segments. The purpose of this secondary lining was mainly to smooth the inner surface of the lining (finishing), waterproofing, rust prevention, and other vibration proofing.

0004

[Problems to be Solved by the Invention] The conventional lining method as described above has the following problems.

(1) When a shield tunnel is completed, the function of the secondary lining is generally that it is not a stress member that receives external pressure, but does not need to be thick as long as it is smooth and has water-stopping and rust-preventing effects. Due to the workability of cast-in-place concrete, at least several tens of centimeters
It has a thickness of about m or more. Therefore, in order to ensure the thickness of the secondary lining, the extra cross section must be excavated using a shield excavator.

(2) Since the cross section of the primary lining increases by the thickness of the secondary lining, which is not a stress member, the design of the primary lining segment becomes excessive.

(3) In shield tunnels, it is difficult to perform primary and secondary lining in parallel within a narrow tunnel;
The secondary lining is constructed after the primary lining is completed, which requires a very long construction period.

On the other hand, there are shield tunnels in which the secondary lining is omitted and the cross-section is completed with only the primary lining, but this does not provide complete waterproofing and rust prevention, and may cause problems within the tunnel.

The present invention has been made to solve the above-mentioned problems.

0010

[Means for Solving the Problems] The features of the present invention for solving the above-mentioned conventional problems are as follows: First, a shield tunneling machine is made to excavate a fixed length at a time, and the shield tube of the shield tunneling machine is In a shield tunnel lining method in which a primary lining of segments is assembled and extruded in the rear end, the outer diameter of the primary lining is made smaller than the outer diameter of the shield tube to create a gap between the ground surface and the outer surface of the primary lining. The second step is to form a segment at the rear end of the shield tube of the shield excavator, and inject an outer lining material that hardens over time into the gap at the same time as the shield excavator excavates. In a shield tunnel lining device that includes an assembly section and pushes out a primary lining made of segments assembled into a cylindrical shape in the segment assembly section rearward at the same time as the shield excavator excavates, the inside of the rear end of the shield tube is An inner cylinder for supporting the primary lining is provided in a double-cylindrical shape, and the inside of the inner cylinder is used as the segment assembly part, and a space between the shield cylinder and the inner cylinder is used as a filler extrusion part with the rear end side open. , the outer surface lining supply pipe is communicated within the filler extrusion section.

[0011]

[Function] In the shield tunnel lining method and device of the present invention, the primary lining made of segments is pushed backward as the shield tunneling machine excavates, and the outer peripheral surface of the pushed out primary lining and the tunnel ground are A void is formed between the mountain and the inner surface.

[0012] Simultaneously with the excavation of the shield excavator, an outer lining material that hardens over time is injected to fill the void. With this outer lining material, an outer lining equal to the thickness of the gap is created integrally with the primary lining, thereby completely lining the entire space.

[0013]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, 10 is a shield tube of a shield tunneling machine. Although not shown in the figure, this shield excavator is equipped with an excavation mechanism such as a shield cutter and a sludge removal mechanism such as a screw conveyor on its front end side.

At the rear end of the shield cylinder 10, an inner cylinder 11 is provided inside thereof in the form of a double cylinder concentrically arranged. Both cylinders 1
The front side between 0 and 11 is closed by an end wall 12, and the rear end side is opened in a ring shape, and the inside is an outer lining material extrusion part 13.
It becomes.

A plurality of outer lining material supply pipes 14, 14, .

The inside of the inner cylinder 11 is a segment assembly part 15, and a tail packing 16 is fixed to the inner surface of the rear end, and a primary lining 18 made of segments 17, 17, etc. is pressed into contact with the inside of the tail packing 16. It has become.

Hydraulic jacks 19, 19, .
By pushing it inwards and backwards, the entire shield excavator is made to dig.

Although not shown in the figure, the outer lining material supply pipes 14, 14... are filled with cement milk, mortar, etc. as a main material using a pouring pump, and harden over time.
After curing, a self-hardening cement-based outer lining material with high water-stop properties is pumped in.

Next, the lining method using the above-mentioned device will be explained. As in the conventional method, the primary lining 18
The segments 17, 17, . . . are assembled in a cylindrical shape within the inner cylinder 11 to extend the primary lining. The reaction force is taken at the tip of this primary lining 18 and hydraulic jacks 19, 19...
Propel the shield excavator while pushing out the inner cylinder 11.
Push out the primary lining 18 from inside.

At this time, the primary lining 18 behind the outer lining material extrusion part 13 between the two cylinders 10 and 11 and the inner surface 20 of the tunnel ground
A gap will be formed between the outer lining material supply pipes 14, 14, and 14 at the same time as the shield excavator is propelled.
By injecting the outer lining material 21, the outer lining material 21 is filled into the void.

As a result, the outer lining 22 having the same thickness as the void is integrally formed between the outer surface of the primary lining 18 and the ground surface 20.

[0023] By using segments 17 for the primary lining 18 whose inner surfaces are finished smoothly, the inner surface finishing work after the lining construction is omitted.

In the figure, 23 and 24 indicate bolts for assembling segments, and long bolts 23 passing through the segments 17 in the width direction are used to connect the primary lining 18 in the axial direction. For circumferential connection, a recess 25 on the inner surface is used.
A short bolt 24 directed diagonally from the front is used. The long bolts 23 are rust-proofed by sealing the joints, and the short bolts 24 are rust-proofed by filling the recesses 25 with mortar and sealing the joints.

[0025]

Effects of the Invention As described above, in the present invention, the primary lining made of segments is made smaller than the outer diameter of the shield cylinder so that a gap for the outer lining is formed outside the primary lining, thereby facilitating shield excavation. By moving the machine forward and injecting the outer lining material outside the primary lining at the same time, the outer lining is integrally molded at the same time as the primary lining is pushed out of the shield cylinder. This eliminates the need for secondary lining, significantly simplifying the lining work and shortening the construction period.

[0026] Furthermore, since the inner surface of the primary lining made of segments becomes the finished inner surface of the tunnel, the diameter may be smaller than that of the primary lining for which secondary lining is planned, and for this reason, it is possible to provide leeway in the design of the segments. At the same time,
There is also no need to use a large tail seal.

Furthermore, by forming the outer lining using the primary lining made of segments as a formwork instead of the secondary lining cast on site, the thickness of the lining can be reduced to the thickness required only for stress. Since it can be made close to the same size as before, the cross section of tunnel excavation can be made smaller than in the past, making it highly economical.

Furthermore, an inner cylinder is provided in the shape of a double cylinder at the rear end of the shield cylinder, the inside of which is used as a segment assembly part, and the outer lining material is injected at the same time as the tunnel is excavated. It can be lined while preventing the mountain from loosening.

[Brief explanation of the drawing]

[Fig. 1] A longitudinal side view showing the main parts of the method and apparatus of the present invention.

[Figure 2] Cross-sectional view taken along line A-A in Figure 1

[Figure 3] Cross-sectional view taken along line B-B in Figure 1

[Fig. 4] Enlarged cross-sectional view taken along line C-C in Fig. 1

[Figure 5] Enlarged sectional view of the X part in Figure 1

[Explanation of symbols]

10 Shield tube 11 Inner cylinder 12 End wall 13 Outer lining material extrusion part 14 Outer lining material supply pipe 15 Segment assembly department 16 Tail packing 17 Segment 18 Primary lining 19 Hydraulic jack 20 Tunnel ground surface 21 Outer lining material 22 Outside lining 23 Long bolt 24 Short bolt 25 Recess

Claims (2)

[Claims] [Claim 1] A shield excavator excavates a certain length at a time,
In a shield tunnel lining method in which a primary lining of segments is assembled and pushed out within the rear end of a shield tube of the shield tunneling machine, the outer diameter of the primary lining is made smaller than the outer diameter of the shield tube so that it is flush with the ground surface. A shield tunnel characterized in that a gap is formed between the outer surfaces of the primary lining, and an outer lining material that hardens over time is injected into the gap at the same time as the shield tunneling machine excavates to form an outer lining. Lining method. Claim 2: A segment assembly section is provided at the rear end of the shield tube of the shield tunneling machine, and the primary lining, in which the segments are assembled into a cylindrical shape, is pushed out rearward at the same time as the shield tunneling machine excavates. In this shield tunnel lining device, a double-cylindrical inner cylinder for primary lining support is provided in the rear end of the shield cylinder, and the inside of the inner cylinder serves as the segment assembly part, and the shield cylinder and A lining device for a shield tunnel, characterized in that a filler extrusion part with an open rear end is formed between the inner cylinders, and an outer lining supply pipe is communicated with the filler extrusion part.