A portal structure for a shield tunneling through a mine tunneling method tunnel

Abstract

The present invention discloses a portal structure for a shield top excavation through a mining method tunnel, the portal structure is arranged at the junction of the mining method tunnel and the shield top excavation tunnel, the portal structure comprises a portal steel ring and a portal sealing device, the bottom of the portal steel ring is pre-buried in a concrete receiving strip beam cast at the bottom of the mining method tunnel, the side of the portal steel ring is connected to the tunnel primary support steel frame and fixed by spraying concrete, the top of the portal steel ring is connected and fixed to the steel frame at the top of the tunnel through a steel mesh, and the arch area is closed by spraying concrete. The present invention forms an integral force system with the portal structure and the primary support structure of the mining method tunnel, effectively preventing the portal structure from being damaged during the process of the rectangular shield top excavator exiting the tunnel, thereby affecting subsequent construction, and the portal structure significantly reduces various types of mud and groundwater that flow into the mining method tunnel during the process of the rectangular shield top excavator entering the mining method tunnel, providing conditions for subsequent construction.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a portal structure of a rectangular shield top-dig through-mine tunnel. Background Art

[0002] Rectangular shield top excavation construction technology is a new type of trenchless construction technology. It uses a rectangular shield top excavator to excavate in the stratum, and the pipe segments enter the stratum together with the top excavator to form the main structure of the tunnel.

[0003] In general, the depth of soil cover in rectangular shield top-digging tunnels is not large, usually around 5 to 8 meters. During the construction process, it is often necessary to cross various municipal pipelines at close range. When encountering municipal pipelines with deep burial depths and large diameters, the current rectangular shield top-digging machine has limited cutter torque and cannot rely on the top-digging machine itself to eliminate pipeline obstacles. At this time, if the conditions for handling the pipeline obstacle from the ground are not met, the mining method is usually used from the other end of the tunnel to the location of the pipeline obstacle, and then it is handled to provide conditions for the subsequent rectangular shield top-digging tunnel to be connected.

[0004] Since a large amount of friction-reducing mud and improved mud are required during the rectangular shield top excavation construction process, in order to prevent the gushing out of a large amount of mud, water and sand or the collapse of the stratum soil at the junction of the mining method tunnel and the rectangular shield top excavation tunnel, how to set up a portal structure at this junction to ensure that the rectangular shield top excavator can smoothly exit the tunnel and enter the mining method tunnel section is a problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a portal structure of the shield tunnel through the mining method tunnel, which can ensure that the rectangular shield tunneling machine can smoothly exit the tunnel and enter the mining method tunnel section, while reducing the influx of various types of mud and groundwater into the mining method tunnel during the process.

[0006] The technical solution of the present invention is implemented as follows: a portal structure for a shield-top excavated mining tunnel, characterized in that: the portal structure is arranged at the junction of the mining tunnel and the shield-top excavated tunnel, the portal structure includes a portal steel ring and a portal sealing device, the bottom of the portal steel ring is pre-buried in the concrete receiving strip beam cast at the bottom of the mining tunnel, the side of the portal steel ring is connected to the tunnel primary support steel frame and fixed by spraying concrete, the top of the portal steel ring is connected and fixed to the steel frame at the top of the tunnel through a steel mesh and the arch area is closed by spraying concrete.

[0007] The portal structure of the shield top excavation mining method tunnel described in the present invention has the bottom of the portal steel ring enclosed by concrete, and two tracks are arranged on the top surface of the concrete receiving strip beam.

[0008] For the portal structure of the shield tunneling through the mine tunneling method in the present invention, the side of the portal steel ring is welded and fixed to the initial support steel frame of the tunnel through inner longitudinal connecting bars and outer longitudinal connecting bars.

[0009] For the portal structure of the shield tunneling through the mine tunneling method in the present invention, wire mesh sheets are respectively connected to the front and rear two frames inside the tunnel top corresponding to the top of the portal steel ring, and the lower ends of the wire mesh sheets are connected and fixed to the front and rear end faces of the top of the portal steel ring.

[0010] In the present invention, a portal structure with a sealing device is arranged at the junction of the mine tunneling method tunnel and the rectangular shield tunneling tunnel, and the portal structure is connected to the initial support structure of the mine tunneling method tunnel and the receiving floor concrete to form an integral body. The portal structure and the initial support structure of the mine tunneling method tunnel form an integral stress system, effectively preventing damage to the portal structure during the exit process of the rectangular shield tunneling machine, which may affect subsequent construction. Moreover, this portal structure significantly reduces various slurries and groundwater flowing into the mine tunneling method tunnel during the process of the rectangular shield tunneling machine entering the mine tunneling method tunnel, providing conditions for subsequent construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the present invention.

[0012] Figure 2 It is a schematic diagram of the portal structure in the present invention.

[0013] Figure 3 It is a schematic diagram of the installation and fixation of the bottom of the portal steel ring in the present invention.

[0014] Figure 4 It is a schematic diagram of the installation and fixation of the side of the portal steel ring in the present invention.

[0015] Figure 5 It is a schematic diagram of the installation and fixation of the top of the portal steel in the present invention.

[0016] Figure 6 It is a closed diagram of the face before the rectangular shield tunneling machine exits the tunnel in the present invention.

[0017] Markings in the figure: 1 is the mine tunneling method tunnel, 2 is the shield tunneling tunnel, 3 is the portal steel ring, 4 is the portal sealing device, 5 is the concrete receiving strip beam, 6 is the initial support steel frame of the tunnel, 7 is the wire mesh sheet, 8 is the steel frame, 9 is the track, 10 is the inner longitudinal connecting bar, 11 is the outer longitudinal connecting bar, 12 is the face concrete structure, and 13 is the rectangular shield tunneling machine. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings.

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] As Figures 1 to 5 shown, a portal structure for a shield tunneling machine to pass through a mined tunnel. The portal structure is arranged at the junction of the mined tunnel 1 and the shield tunneling tunnel 2. The portal structure includes a portal steel ring 3 and a portal sealing device 4. The portal sealing device 4 includes a pre-embedded steel plate, a rubber plate and a pressing plate. The pre-embedded steel plate is arranged inside the portal steel ring. A number of rubber plates are arranged along the edge of the portal opening to form a curtain structure. The outer end of each rubber plate is connected and fixed to the pre-embedded steel plate through the pressing plate. The inner end of the rubber plate extends inward. The opening size formed by the number of rubber plates is smaller than the portal opening size. When the front end of the rectangular shield tunneling machine 13 is placed inside the portal, the inner end of the rubber plate bends along the running direction of the rectangular shield tunneling machine and cooperates with the shell of the rectangular shield tunneling machine to form a seal, thus significantly reducing various slurries and groundwater flowing into the mined tunnel during the process of the rectangular shield tunneling machine entering the mined tunnel, providing conditions for subsequent construction; the bottom of the portal steel ring 3 is pre-embedded in the concrete receiving strip beam 5 poured at the bottom of the mined tunnel 1. The side of the portal steel ring 3 is connected to the tunnel primary support steel frame 6 and fixed by spraying concrete. The top of the portal steel ring 3 is connected and fixed to the steel frame 8 at the top of the tunnel through a steel mesh 7, and the arch top area is closed by spraying concrete. Through the connection structure design between the portal steel ring and the mined tunnel, the present invention makes the portal structure and the mined tunnel primary support structure form an integral stress system, improves the integrity and stability of the portal structure, effectively prevents the damage of the portal structure during the process of the rectangular shield tunneling machine exiting the tunnel, affects subsequent construction, and at the same time, the portal structure can also effectively prevent the collapse of the formation soil during the process of the rectangular shield tunneling machine exiting the tunnel, thereby improving the construction safety and providing guarantee for the safe and smooth exit of the tunneling machine.

[0021] In this embodiment, the bottom of the portal steel ring 3 is enclosed by concrete with a thickness of 18 cm. Two tracks 9 are arranged on the top surface of the concrete receiving strip beam 5 for the smooth reception of the rectangular shield tunneling machine. The side of the portal steel ring 3 is welded and fixed to the tunnel primary support steel frame 6 through inner-layer longitudinal connecting bars 10 and outer-layer longitudinal connecting bars 11. The inner and outer-layer longitudinal connecting bars are arranged alternately in the vertical direction. The portal steel ring is arranged between adjacent tunnel primary support steel frames 6. The front and rear two steel frames 8 in the tunnel top corresponding to the top of the portal steel ring 3 are respectively connected with a steel mesh 7. The lower end of the steel mesh 7 is connected and fixed to the front and rear end faces of the top of the portal steel ring 3. The length of the steel mesh gradually decreases from the middle of the arch top area to both sides and is arranged at equal intervals.

[0022] AsFigure 6 As shown, before the rectangular shield tunneling machine 13 exits the shaft, the face of the portal structure is temporarily sprayed with concrete to prevent a large amount of muck from collapsing. A wire mesh is hung on the top of the face concrete structure 12 and sprayed with concrete, with a top thickness of 20 cm and a bottom thickness of 10 cm for plain concrete spraying at the bottom.

[0023] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A portal structure for a shield tunneling through a mine tunneling method tunnel, characterized in that: The portal structure is arranged at the junction of a mining tunnel (1) and a shield tunnel (2), and comprises a portal steel ring (3) and a portal sealing device (4). The bottom of the portal steel ring (3) is pre-buried in a concrete receiving strip beam (5) cast at the bottom of the mining tunnel (1), and two rails (9) are arranged on the top surface of the concrete receiving strip beam (5). The side of the portal steel ring (3) is connected to the tunnel primary support steel frame (6) through an inner longitudinal connecting rib (10) and an outer longitudinal connecting rib (11) and fixed by spraying concrete. The front and rear steel frames (8) in the tunnel top corresponding to the top of the portal steel ring (3) are respectively connected with steel mesh sheets (7). The lower end of the steel mesh sheet (7) is connected and fixed to the front and rear end surfaces of the top of the portal steel ring (3), and the arch area is sealed by spraying concrete. The length of the steel mesh sheet (7) gradually decreases from the middle of the arch area to both sides and is arranged at equal intervals. The tunnel door sealing device (4) comprises a pre-buried steel plate, a rubber plate and a pressure plate, wherein the pre-buried steel plate is arranged in the tunnel door steel ring (3); before the rectangular shield top excavator (13) exits the tunnel, the tunnel face of the tunnel door structure is sprayed with concrete to seal it, a steel mesh is hung on the top of the tunnel face concrete structure (12) to spray concrete, and plain concrete is sprayed on the bottom.

2. The portal structure of the shield tunneling through the mine tunneling method tunnel according to claim 1, characterized in that: The bottom of the tunnel gate steel ring (3) is encapsulated with concrete.

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