Shield launching steel box

Abstract

The utility model relates to shield launching, belongs to the technical field of shield engineering, and particularly relates to a shield launching steel box, which comprises a tunnel portal, a duct piece and a shield tunneling machine arranged at the bottom of the tunnel portal. The box body mechanism comprises an embedded steel plate fixedly mounted on the outer side of a tunnel portal; the rubber cord fabric plate is fixedly installed on the outer ring of the tunnel portal, and a fixing plate is fixedly installed on one side of the rubber cord fabric plate; the device achieves the effects of improving the sealing performance and preventing silt from gushing, and solves the problems that during existing shield launching, due to the fact that rubber curtain cloth is flexible, slurry leakage frequently occurs at a curtain cloth plate along with continuous pressurization of a shield tunneling machine soil bin, after a shield tunneling machine completely enters a soil body, the contact effect of the rubber curtain cloth and a pipe piece is often poor, and the service life of the shield tunneling machine is prolonged. And the muddy water gushing phenomenon of the tunnel portal ring is more obvious.

Description

Technical Field

[0001] This utility model relates to the field of shield tunneling technology, and in particular to a shield launching steel box. Background Technology

[0002] Because there are certain gaps between the portal ring and the shield, and between the portal ring and the tunnel lining segments, rubber curtains and hinged pressure plates are generally installed on the portal ring to prevent soil loss or mud spraying from the gaps.

[0003] A search revealed Chinese patent CN111456755B, which discloses a small radius-of-curvature tunnel shield launching steel box, including a steel box support and a water-stopping part disposed on the steel box support. The steel box support includes a steel box base and a pre-embedded steel ring disposed on the upper end of the steel box base. The water-stopping part includes a water-stopping steel ring fixedly connected to the pre-embedded steel ring. A first curtain rubber plate is fixedly connected to the inner side of the pre-embedded steel ring, and a second curtain rubber plate is fixedly connected to the inner side of the water-stopping steel ring. The first and second curtain rubber plates are respectively located on both sides of the water-stopping steel ring. This utility model has good water-stopping effect and controllable leakage, and can be applied to shield construction in geological structures, surrounding construction environments with complex geological structures and rich groundwater strata. Due to its controllable wedge structure, by changing the geometric dimensions of the wedge, it can be applied to shield construction under different radii of curvature and straight shield construction.

[0004] Based on the above search and existing technology, the findings were as follows:

[0005] When the aforementioned patents were used for the initial launch of the tunnel boring machine (TBM), because the rubber curtain was flexible, mud leakage often occurred at the curtain plate as the soil chamber of the TBM was continuously pressurized. After the TBM had fully entered the soil, the rubber curtain rebound and contact effect with the tunnel segments was often very poor, and the phenomenon of mud and water gushing from the tunnel portal ring was more obvious, thus having certain limitations. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model proposes a shield tunneling starting steel box, which keeps the portal ring and the tunnel segments in a sealed and solid filling state, thus ensuring the safety of the starting stage.

[0007] The technical solution to achieve the purpose of this utility model is: a shield tunneling starting steel box, including a tunnel portal, tunnel segments and a shield machine, wherein the shield machine is set at the bottom of the tunnel portal, and also includes a box body mechanism;

[0008] The box-shaped structure includes a pre-embedded steel plate fixedly installed on the outside of the opening;

[0009] A rubber curtain plate is fixedly installed on the outer ring of the opening, and a fixing plate is fixedly installed on one side of the rubber curtain plate.

[0010] Preferably, a primary sealing plate is fixedly installed on one side of the top of the pre-embedded steel plate, the rubber curtain plate and the fixing plate are both set inside the primary sealing plate, and a pipe segment backing steel plate is fixedly installed on the outside of the pipe segment.

[0011] Preferably, a bolt is threadedly installed on the fixing plate, one end of the bolt passes through the rubber curtain plate and the fixing plate and is fitted with a threaded sleeve, the threaded sleeve is located inside the opening, and a hinge plate is fixedly installed on the outside of the fixing plate, the hinge plate being provided with a rotating shaft.

[0012] Preferably, a flexible sealing plate is welded to one side of the bottom of the primary sealing plate, and a secondary sealing plate is welded to the other side of the bottom of the primary sealing plate. The bottom end of the secondary sealing plate is fixedly connected to the steel plate attached to the back of the pipe segment, and multiple grouting holes are provided on the primary sealing plate.

[0013] Compared with existing technologies, the significant advantages of this invention are:

[0014] Firstly, this utility model can effectively ensure the sealing between the tunnel portal ring and the shield and segments during the initial stage of shield tunneling, avoiding possible mud and water gushing and soil erosion during the initial stage, and reducing the risks during the initial stage of shield tunneling, especially when the initial area is a soft soil area rich in confined water.

[0015] Secondly, after the tunnel boring machine has fully entered the soil, a secondary sealing plate is installed on top of the primary sealing plate. The secondary sealing plate is welded to the primary sealing plate and the steel plate attached to the back of the tunnel segment to form a fully enclosed state. Then, cement grout is injected through the grouting holes reserved on the steel box to ensure that the portal ring and the tunnel segment are in a sealed and solidly filled state, thus ensuring the safety of the initial stage.

[0016] This solves the existing problems that occur during the initial launch of a tunnel boring machine (TBM), where the flexible rubber curtain often leaks mud at the curtain plate as the soil chamber of the TBM is continuously pressurized. Furthermore, once the TBM is fully submerged, the rubber curtain's rebound and contact with the tunnel segments are often poor, and the mud and water gushing phenomenon at the tunnel portal is even more pronounced. Attached Figure Description

[0017] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a cross-sectional structural schematic diagram provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the end face structure provided by this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Tunnel portal; 2. Segment; 3. Embedded steel plate; 4. Primary sealing plate; 5. Bolt; 6. Rotating shaft; 7. Rubber curtain plate; 8. Flexible sealing sheet; 9. Secondary sealing plate; 10. Threaded sleeve; 11. Folding pressure plate; 12. Segment backing steel plate; 13. Grouting hole; 14. Tunnel boring machine; 15. Fixing plate. Detailed Implementation

[0022] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0023] This utility model provides an improved shield tunneling starting steel box. The technical solution of this utility model is as follows:

[0024] like Figures 1-2 As shown, a shield tunneling starting steel box includes a portal 1, tunnel segments 2 and a shield machine 14. The shield machine 14 is located at the bottom of the portal 1 to ensure sealing and reduce the risk during the shield tunneling starting stage. It also includes a box body mechanism.

[0025] The box structure includes a pre-embedded steel plate 3 fixedly installed on the outside of the portal 1. The pre-embedded steel plate 3 and the portal 1 form a sealed whole, preventing water leakage from the gap between the portal 1 and the steel box at the start of the project, thus achieving a sealing and leak-proof effect. The structure is simple and easy to assemble, improving the construction quality.

[0026] Rubber curtain plate 7 is fixedly installed on the outer ring of the tunnel portal 1. A fixing plate 15 is fixedly installed on one side of the rubber curtain plate 7. By utilizing the high elasticity and compression deformation characteristics of rubber, it can adapt to the thermal expansion and contraction of the tunnel wall or the deformation of the foundation and maintain a long-term sealing effect.

[0027] Furthermore, a primary sealing plate 4 is fixedly installed on one side of the top of the pre-embedded steel plate 3. The rubber curtain plate 7 and the fixing plate 15 are both set inside the primary sealing plate 4. A steel plate 12 for backing the pipe segment 2 is fixedly installed on the outside of the pipe segment 2. The steel plate is attached to the outside of the concrete pipe segment 2 to improve its mechanical properties, waterproof ability and durability. In addition, the steel plate is made of galvanized material and has corrosion resistance.

[0028] As a further embodiment of this utility model, a bolt 5 is threadedly installed on the fixing plate 15. One end of the bolt 5 passes through the rubber curtain plate 7 and the fixing plate 15 and is fitted with a threaded sleeve 10. The threaded sleeve 10 is located inside the tunnel portal 1. A hinge plate 11 is fixedly installed on the outside of the fixing plate 15. A rotating shaft 6 is provided on the hinge plate 11. The hinge plate 11 is tightly fitted with the outer shell of the tunnel boring machine 14 through the folding plate to prevent groundwater and mud from seeping in from the gap of the tunnel portal 1 and to ensure the stability of the excavation face.

[0029] Furthermore, a flexible sealing plate 8 is welded to one side of the bottom of the primary sealing plate 4, and a secondary sealing plate 9 is welded to the other side of the bottom of the primary sealing plate 4. The bottom end of the secondary sealing plate 9 is fixedly connected to the back steel plate 12 of the pipe segment. Multiple grouting holes 13 are opened on the primary sealing plate 4. A flexible sealing steel plate is installed on the primary sealing plate 4. The steel plate is a 2mm thin plate and is installed in a fish scale pattern to ensure sealing.

[0030] The specific working method is as follows: First, construct the shield launching shaft structure and assemble the shield machine 14. Process the segment backing steel plate 12 in the factory. According to the design drawings and plan, install the rubber curtain plate 7 and the hinged pressure plate 11 around the portal. In addition, calculate the gap between the shield machine 14 and the portal ring, and weld and install the primary sealing plate 4 in sections. The sealing plate is made of 10mm thick steel plate and is connected to the pre-embedded steel of the portal ring. The primary sealing plate 4 must completely wrap the installed rubber curtain plate 7 and pressure plate. To avoid the shield machine 14 from colliding and damaging the primary sealing plate 4, a gap of 1-2cm is reserved between the sealing plate and the shield machine 14. Then, on the primary sealing plate 4... Flexible sealing plates 8, made of 2mm thick, are installed to seal the 1-2cm gap between the primary sealing plate 4 and the tunnel boring machine 14. The plates are installed in a fish-scale pattern. After the tunnel boring machine 14 starts moving, the segments 2 are assembled, and gradually pass through the sealing plates, they all enter the soil. The +1 ring segments 2 use segment backing steel plates 12. The tunnel boring machine 14 pauses its advance and a secondary sealing plate 9 is installed on the steel box. A 10mm thick steel plate is used and welded to the primary sealing plate 4 and the segment backing steel plates 12. Finally, grouting is performed through the pre-reserved grouting holes 13 on the steel box. Cement grout is used as the grout. The steel box is then completely sealed, and the tunnel boring machine can advance normally.

[0031] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of equivalent substitutions of the above technical features. Matters not covered in this utility model are common knowledge to those skilled in the art.

Claims

1. A shield launching steel box comprising a portal (1), a segment (2) and a shield machine (14), characterized in that: The tunnel boring machine (14) is located at the bottom of the portal (1) and also includes; The box-shaped structure includes a pre-embedded steel plate (3) fixedly installed on the outside of the opening (1); A rubber curtain board (7) is fixedly installed on the outer ring of the opening (1), and a fixing plate (15) is fixedly installed on one side of the rubber curtain board (7).

2. A steel launching box for a tunneling shield according to claim 1, characterized in that: A primary sealing plate (4) is fixedly installed on one side of the top of the pre-embedded steel plate (3). The rubber curtain plate (7) and the fixing plate (15) are both set on the inner side of the primary sealing plate (4). A pipe segment backing steel plate (12) is fixedly installed on the outer side of the pipe segment (2).

3. A steel launching box for a tunneling shield according to claim 1, wherein: A bolt (5) is threaded on the fixing plate (15). One end of the bolt (5) passes through the rubber curtain plate (7) and the fixing plate (15) and is fitted with a threaded sleeve (10). The threaded sleeve (10) is located inside the opening (1). A hinge plate (11) is fixedly installed on the outside of the fixing plate (15). A rotating shaft (6) is provided on the hinge plate (11).

4. A steel launching box according to claim 2, wherein: A flexible sealing plate (8) is welded to one side of the bottom of the primary sealing plate (4), and a secondary sealing plate (9) is welded to the other side of the bottom of the primary sealing plate (4). The bottom end of the secondary sealing plate (9) is fixedly connected to the back steel plate (12) of the pipe segment. Multiple grouting holes (13) are opened on the primary sealing plate (4).

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