JPS6226397B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In conventional construction methods for constructing structures under railway tracks, roads, etc., the pipe roofing construction method has come to be widely used as an auxiliary construction method as a maintenance measure to prevent subsidence of the roadbed.

However, in this construction method, the pipe roofing is used only for temporary construction and becomes unnecessary after the construction of the main body, which is uneconomical, and the effect of suppressing ground subsidence is insufficient. In addition, a long construction period is required for the pipe roofing and the construction of the main body underneath, and in the case of construction across railway tracks, a long period of time is required for train removal. Furthermore, if there is little earth covering, it will not be possible to secure space for constructing pipe roofing, making construction difficult. Furthermore, there were other drawbacks such as poor construction accuracy when the tunnel length exceeded 30 m.

In order to solve these problems, various construction methods have been proposed that improve economic effects by constructing pipes that are only used as temporary structures as main structures. Elements are arranged as beams in the direction of the track, and girders and abutments are required to securely support both ends of the beams, making it difficult to construct tunnels longer than 15 meters due to constraints on the strength of the beams.

The present invention was proposed in order to eliminate such drawbacks.The present invention has been proposed in order to eliminate such drawbacks. A screw auger for carrying out excavated soil by the horizontal cutter is disposed behind the horizontal cutter located across the front upper end of the horizontal member and the vertical members at both ends of the horizontal member,
At the bottom of the horizontal cutter, excavation is carried out by an excavation device having a cutter disposed in front of the vertical member in the segment, and the excavated soil is discharged backward from the vertical member and is successively propelled into the ground. An upper tunnel frame with a gate-shaped cross section was constructed, and then both side segments were constructed by integrally connecting the lower end of the reinforced concrete upper vertical member with a steel box-shaped lower vertical member with openings on the front and rear sides. is discharged backward from the lower vertical member, and is successively propelled into the ground to construct lower tunnel frames on both sides connected to the lower portions of both sides of the upper section type tunnel frame, and then excavate the inside of each tunnel frame. The present invention also relates to a tunnel construction method characterized in that each box-shaped vertical member is filled with concrete.

In the present invention, as described above, steel box-shaped vertical members with openings on the front and rear sides are integrally connected to both ends of a reinforced concrete horizontal member to form a gate-shaped segment, and the front surface of the segment is connected to the horizontal member. A screw auger for carrying out the excavated soil by the cutter is disposed behind the horizontal cutter located across the front upper end of the vertical member at both ends of the member, and a screw auger for carrying out the excavated soil by the cutter is installed at the lower part of the horizontal cutter. While excavating with an excavator equipped with a cutter, the excavators are successively propelled into the ground and connected to construct an upper tunnel frame with a gate-shaped cross section underground. The purpose of the ingpipe is fulfilled, and when excavating, the roadbed is bulged,
The tunnel can be easily constructed without causing subsidence even when the earth cover is shallow when constructing a tunnel crossing under a railroad track.

In addition, in the present invention, a box-shaped lower vertical member made of steel with openings on the front and rear sides is integrally connected to the lower end of the upper vertical member made of reinforced concrete to form segments on both sides, and each side segment is connected to the lower end of the upper vertical member made of reinforced concrete. While excavating, we will propel the connection into the ground one by one, and
A tunnel is constructed by connecting to the upper tunnel frame to construct lower tunnel frames on both sides, excavating the area surrounded by both the upper and lower tunnel frames, and filling each of the box-shaped vertical members with concrete. According to the present invention, the tunnel is constructed by dividing the upper tunnel frame and the lower tunnel frame, and the tunnel can be arbitrarily divided into segments in the tunnel direction depending on the width of the starting shaft. By dividing the tunnel into sections, it becomes possible to construct long tunnels.

Further, according to the present invention, the reinforced concrete horizontal member in the gate-shaped segment constituting the gate-shaped upper tunnel frame serves as a conventional roofing pipe as described above, and also serves as a structural member itself, This saves construction cost and construction time, and the horizontal members are constructed of short members extending perpendicular to the railway line, unlike the conventional construction method using members extending in the direction of the railway line. It becomes possible to construct tunnels.

Each segment is composed of a composite member made of a reinforced concrete member and a box-shaped vertical member with openings on the front and rear sides, and the strong reinforced concrete member supports the propulsion reaction force of the propulsion jack of the excavation mechanism at the front of the segment. Further, the excavated soil by the excavation mechanism is carried out rearward through the box-shaped vertical member, thereby effectively performing tunnel excavation work.

The present invention will be described below with reference to the illustrated embodiments.

A is a gate-shaped segment, in which a box-shaped vertical member 2 made of steel with openings on the front and back sides is arranged at both ends of a horizontal member 1 made of reinforced concrete, and a vertical member 2 made of steel with an opening on the front and back sides is provided so as to protrude in a cantilever shape from the side of the upper end of the member 2. The reinforcing bars 4 of the horizontal member 1 are welded to the connecting member 3, and both the members 1 and 2 are integrally joined. A locking protrusion 6 having a locking pin 5 and a locking recess 8 having a locking hole 7 in which the pin 5 is to be locked are arranged at positions corresponding to the front and rear surfaces of the horizontal member 1, respectively. ing. Further, the vertical member 2 is provided with a lower plate 9 which closes its lower end surface and is formed into locking ribs 9a whose both ends protrude from the sides of the member.

B is a side segment, in which a box-shaped lower vertical member 11 made of steel with openings on the front and rear surfaces is disposed at the lower end of an upper vertical member 10 made of reinforced concrete, and a connecting member 12 protrudes from the top of the member 11. Welded to the reinforcing bars 13 of the vertical member 10, both the members 10,1
1 are connected together. Further, the vertical member 1
An engaging piece 14 having groove-shaped portions 14a at both ends that engages with the lower end locking rib 9a of the box-shaped vertical member 2 in the gate-shaped segment A is integrally anchored to the upper end of the gate-shaped vertical member 2. Reinforced concrete horizontal leg pieces 15 are disposed on both sides of the lower end of the vertical member 10, and connecting members 16 projecting in a cantilever shape from both sides of the vertical member 10 are welded to the reinforcing bars 17 of the leg pieces 15. Both members 10 and 15 are integrally connected. Further, a locking pin 18 is provided at a corresponding portion on the front and rear surfaces of the leg piece 5.
A locking convex portion 19 and a locking recess 21 having a locking hole 20 in which the pin 18 is to be locked are provided.

Figures 7 to 11 show a drilling device C installed in front of a portal segment A;
Behind the horizontal cutter 22 located across the front surface of the upper end of the horizontal member 1 and the vertical member 2 adjacent to both sides of both members 1, there is a screw auger 23 for conveying the soil excavated by the cutter 22 to both ends. A lower cutter 24 is disposed below the horizontal cutter 22 and is disposed in front of the vertical member 2 in the segment A, and the screw auger 23 is attached to a horizontal casing disposed at the rear thereof. It is designed to be driven by a hydraulic motor 26 built into the motor 25. 27 in the figure,
Reference numeral 28 denotes a chain ring fixed to the drive shaft of the motor 26 and the rotating shaft of the screw auger 23, respectively, and 29 is an endless chain band extending between the chain rings 27 and 28. Further, the horizontal cutter 22 has a chain ring 30 fixed to its rotating shaft, a chain ring 31 fixed to the rotating shaft of the screw auger 23, and an endless chain belt 32 spanning both chain rings 30, 31. Driven. Furthermore, the lower cutter 24 has a chain ring 33 fixed to its rotation axis and the rotation axis of the horizontal cutter 22, respectively.
34 and an endless chain band 35 spanning both chain rings 33, 34.

A propulsion jack 36 is provided in the horizontal casing 25.
is arranged so as to apply a reaction force to the horizontal member 1 of the portal segment A to move the excavation device forward. In the figure, numeral 37 is a hydraulic unit installed inside the horizontal casing 25.

A vertical casing 38 is disposed behind the lower cutter 24 and adjacent to the side of the horizontal casing 25, and inside the casing 38, soil excavated by the lower cutter 24 and the screw auger 23 are stored.
A conveyor 39 is provided to transport the excavated soil rearward by the horizontal cutter 22, and the excavated soil conveyed by the conveyor 39 is transferred to the vertical casing 38 and the gate type located behind it. It is designed to be carried out of the mine by a transport vehicle 40 that runs inside the box-shaped vertical member 2 of segment A.

FIGS. 12 and 13 show an excavation device D installed on the front side of both segment B, including a chain ring 42 fixed to the vertical rotating shaft of a vertical cutter 41 and a casing 43 installed behind the cutter 41. Chain ring 4 fixed to the drive shaft of a hydraulic motor 44 built into the
An endless chain band 46 is spanned between the vertical cutter 41 and the vertical cutter 41, which is driven by a hydraulic motor 44.
The front surface of the segment B is excavated by the excavator. In addition, at the lower end of the vertical cutter 41,
A horizontal excavator 46' is disposed in front of both legs 15 of the segment B, and the excavator 46' has a cutter 46'a attached to the shaft of a screw auger, thus transporting the excavated soil to the center. Then, the excavated soil excavated by the cutter 41 and falling from between the cutter 41 and the casing 43 is transferred to a conveyor 48 disposed in a lower casing 47 disposed below the casing 43, The excavated soil transported by the conveyor 48 is transferred to a transport vehicle 49 that runs inside the casing 47 and the box-shaped lower vertical member 11 of the segment B connected thereto, and is transported outside the mine. There is.

Further, the casing 43 has a propulsion jack 50.
is arranged, and the upper vertical member 1 of said segment B
The reaction force is reduced to 0 and the drilling equipment is propelled. Note that 51 in the figure is a hydraulic unit.

Therefore, in the present invention, a shaft G is excavated on both sides of the ground F directly below the track E where the tunnel is to be constructed,
(See Figures 14A and 14B) The excavation device C excavates a tunnel hole with a gate-shaped cross section in the ground F, and the excavation device C applies a reaction force to the gate-shaped segments A arranged in a row behind it. Totsute propulsion jack 3
6, the propulsion jack I interposed between the last segment A and the reaction support wall H constructed in the shaft G is actuated to propel the segment A group, and the segment As group A moves forward, a new segment A is attached to the rear end of the group, and the same operation is repeated to construct an upper tunnel frame with a gate-shaped cross section in the ground F using the gate-shaped segments A. . (See Figures 15A and 15B).

Next, in the same manner as described above, the tunnel hole is propelled by the excavation device D, and the segments B are sequentially propelled into the ground F, and each segment B is placed under each of the gate-shaped segments A. Connect and construct the lower tunnel frame. (16A, 16
(See Figure B).

Next, the inside of the upper and lower tunnel frames is excavated, and the box-shaped vertical members 2 and 11 in each of the segments A and B are filled with concrete J.
(See Figures A and 17B) The tunnel T is completed as shown in Figures 18A and 18B.

The present invention has been described below with reference to embodiments, but the present invention is of course not limited to these embodiments, and can be modified in various ways without departing from the spirit of the invention. .

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view of the left half of the portal segment;
Figure 2 is a vertical front view of the left half, Figures 3 and 4.
The figures are shown in the direction of the arrows in Figure 2.
Fig. 5 is a longitudinal sectional view of the side segment, Fig. 6 is a transverse plan view of the left half thereof, Fig. 7 is a transverse plan view of the drilling rig at the front of the portal segment, Figs.
10 and 11 are respectively the arrow views of FIG.
FIG. 13 is a longitudinal sectional view thereof, and FIGS. 14 to 18 are process diagrams of the method of the present invention.
16A, 17A, and 18A are longitudinal sectional side views thereof, and 14B, 15B, 16B, 17B, and 18B are longitudinal sectional views thereof. A...Portal segment, B...Side segment, C, D...Drilling equipment, 1...Horizontal member, 2...
...Box-shaped vertical member, 10... Vertical member, 11... Box-shaped vertical member.

Claims (1)

[Claims] 1. Position the front side of a gate-shaped segment that is integrally connected to both ends of a reinforced concrete horizontal member with a steel box-shaped vertical member with openings on the front and rear surfaces, straddling the front upper end of the horizontal member and the vertical members at both ends of the same member. A screw auger for carrying out excavated soil by the horizontal cutter is disposed behind the horizontal cutter, and a cutter is disposed below the horizontal cutter in front of the vertical member in the segment. The excavated soil is discharged backwards from the vertical member, and is successively propelled underground and connected to construct an upper tunnel frame with a gate-shaped cross section. Next, a steel box with openings on the front and rear sides is placed at the lower end of the reinforced concrete upper vertical member. Both side segments of the lower vertical member of the mold are integrally connected, and the front sides thereof are excavated, the excavated soil is discharged backward from the lower vertical member, and the excavated soil is sequentially propelled underground and connected to both sides of the upper section type tunnel frame. A tunnel construction method comprising constructing lower tunnel frames on both sides connected to the lower part of the tunnel frame, and then excavating the inside of each of the tunnel frames and filling each of the box-shaped vertical members with concrete.