Shield receiving anti-inrush special-shaped air bag device

Abstract

The utility model provides a shield receiving anti-inrush special-shaped air bag device, which belongs to the technical field of shield tunnel supporting, and comprises a pre-buried tunnel portal ring beam with a ring structure, a cord fabric rubber plate and a special-shaped air bag are fixed at the inner ring position of the pre-buried tunnel portal ring beam, the special-shaped air bag is communicated with an inflation pipe, and the inflation pipe is communicated with the pre-buried tunnel portal ring beam. The special-shaped air bag expands to extrude the cord fabric rubber plate, so that the inner ring of the cord fabric rubber plate is tightly attached to the outer contour surface of the shield machine shell, when the shield machine passes, the cord fabric rubber plate, the special-shaped air bag and the circular ring fixing plate are extruded to deform, adjacent part structures are overlapped, and due to the fact that the circular ring fixing plate is small in thickness, the plugging effect can be guaranteed through combination of the cord fabric rubber plate, the special-shaped air bag and the circular ring fixing plate. The sealing structure is arranged between the hole inner wall and the shield tunneling machine shell, so that a blocking layer is formed between the hole inner wall and the shield tunneling machine shell through the sealing structure, the waterproof and sand-proof effects are achieved to the maximum extent, the water burst risk is reduced, and the problem that in the receiving stage of existing shield tunneling method construction, potential safety hazards exist due to the fact that no engineering protection device is arranged is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield tunnel support, in particular to a shield receiving anti-surge special-shaped airbag device. Background Art

[0002] With the rapid increase of China's urbanization rate, traffic problems will become an important factor that troubles urban development. In recent years, my country's urban subway construction has developed a lot, but subway construction also faces complex soil geological conditions,

[0003] Limited traffic and other problems. The construction methods for subway sections include: open excavation, cover excavation and forward construction, cover excavation and reverse construction, cover excavation and semi-reverse construction, shallow buried dark excavation, and shield method. The shield method is the mainstream section construction method in China. Because shield construction has the advantages of high degree of automation, strong applicability, high efficiency, low harm, and good economy, it has been widely used and developed in underground space development, especially in urban subway construction. In recent years, although emerging technologies have been continuously applied in shield engineering, my country's development pace in the technical application of shield construction has been relatively slow, and my country's shield technology is currently very susceptible to various special working conditions. In general, there is still an upper limit to the development of my country's shield technology. The problem that needs to be solved urgently is the problem of safety and quality accidents that are very likely to occur when the shield machine is received.

[0004] The shield construction is divided into three stages: initial construction, excavation and acceptance. The shield acceptance is more prone to accidents than the first two. The shield acceptance stage is in the transition stage from semi-infinite soil to finite soil, that is, the soil in front of the shield is reduced at this time, and the soil is within the scope of soil destruction, which will cause the stress, displacement and force of the surrounding structure to change. The main types of accidents include water and sand gushing, soil collapse, underground pipeline rupture, etc. There are three main reasons for the above engineering accidents:

[0005] (1) The cumulative impact of receiving well excavation on the retaining structure was not considered;

[0006] (2) Improper setting of excavation parameters during the receiving phase;

[0007] (3) Lack of appropriate engineering protection measures to reduce the occurrence of accidents.

[0008] The existence of the above problems makes the safety issues in the receiving stage of the shield tunnel very prominent, especially water and sand gushing, which will be very dangerous if appropriate engineering protection devices are not set up in advance. Utility Model Content

[0009] In view of the above problems in the prior art, the utility model aims to provide a special-shaped airbag device for preventing outburst and gushing during shield tunneling reception, which solves the problem of potential safety hazards in the existing shield tunneling construction during the reception stage due to the absence of engineering protection devices.

[0010] In order to achieve the above utility model purpose, the technical scheme adopted by the utility model is as follows:

[0011] A special-shaped airbag device for preventing outburst and gushing during shield tunneling reception is provided, which includes a pre-embedded portal ring beam in a circular ring structure. The inside of the pre-embedded portal ring beam is used for the shield machine to pass through. A curtain rubber plate and a special-shaped airbag in a circular ring structure are fixedly arranged at the inner ring of the pre-embedded portal ring beam. The special-shaped airbag is communicated with an air charging pipe, and the air charging pipe is used to inflate the special-shaped airbag to realize the expansion of the special-shaped airbag. The expanded special-shaped airbag squeezes the curtain rubber plate, so that the inner ring of the curtain rubber plate closely adheres to the outer contour surface of the shield machine shell.

[0012] Further, a circular groove with a cross-section in a structure is arranged at the inner ring of the pre-embedded portal ring beam. The cross-section of the curtain rubber plate is in a "丿" structure. The outer edge of the curtain rubber plate is fixedly connected with the side wall of the circular groove through a circular fixing plate; the special-shaped airbag is arranged in the circular groove.

[0013] Further, a plurality of bolts are arranged on the circular fixing plate, and the plurality of bolts pass through the circular fixing plate and the curtain rubber plate and are fixedly connected with the side wall of the circular groove.

[0014] Further, a circular ring-shaped baffle is arranged at the inner ring of the pre-embedded portal ring beam, and one side surface of the baffle is used to limit the horizontal expansion direction of the special-shaped airbag.

[0015] Further, a plurality of screws fixedly connected with the inner ring of the pre-embedded portal ring beam are arranged on the baffle.

[0016] Further, the number of the air charging pipes is multiple. The multiple air charging pipes are circumferentially and evenly arranged on the circumferential outer wall of the pre-embedded portal ring beam with the axis of the pre-embedded portal ring beam as the center line. One end of each air charging pipe passes through the pre-embedded portal ring beam and is communicated with the special-shaped airbag, and the other end is communicated with an external air source.

[0017] Further, the manufacturing materials of the pre-embedded portal ring beam, the circular fixing plate and the baffle are all steel.

[0018] The basic principle of the shield receiving anti-surge special-shaped airbag device in the utility model is: firstly, the construction of the inner lining wall is completed, and a whole ring of tunnel gate ring beam and an inflation pipe are pre-buried at the tunnel gate position according to the starting size requirements of the shield; the debris on the surface of the pre-buried tunnel gate ring beam is cleaned, and the curtain rubber plate and the circular ring fixing plate are installed and aligned in sequence at the groove of the tunnel gate ring beam by bolts, and sealing grease is injected between the curtain rubber plate and the circular ring fixing plate; when the shield machine is received after exiting the tunnel, after the shield machine head passes through the groove of the tunnel gate ring beam, the inflation pipe is quickly opened to expand the airbag, so that the curtain rubber plate is closely attached to the outer side of the shield machine shell, and the airbag is fully expanded to compact the gap between the curtain rubber plate and the shield machine shell, so as to form a sealed and waterproof structure.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows: the shield receiving anti-surge special-shaped airbag device of the utility model, when the shield machine passes by, the curtain rubber plate, the special-shaped airbag, and the circular ring fixing plate will be squeezed and deformed, and the adjacent parts of the structure will overlap. Since the thickness of the circular ring fixing plate itself is relatively thin, the combination of the three can ensure the sealing effect; so that a sealing layer can be formed between the inner wall of the cave and the outer casing of the shield machine through the sealing structure, the waterproof and sand-proof effect can be achieved to the greatest extent, the risk of water gushing can be reduced, and the problem of safety hazards in the receiving stage of the existing shield construction due to the lack of engineering protection devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front view of the structure of the shield receiving anti-surge special-shaped airbag device.

[0021] Figure 2 This is a schematic diagram of the back view of the shield machine receiving the anti-surge special-shaped airbag device.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the shield machine receiving the anti-surge special-shaped airbag device.

[0023] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0025] Among them, 1. embedded tunnel gate ring beam; 2. curtain rubber plate; 3. special-shaped airbag; 4. inflation tube; 5. annular groove; 6. circular ring fixing plate; 7. baffle. DETAILED DESCRIPTION

[0026] The specific embodiments of the present utility model will be described below to facilitate those skilled in the art of this technology to understand the present utility model. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of this technology, as long as various changes are within the spirit and scope of the present utility model defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present utility model are within the scope of protection.

[0027] As Figure 1 and Figure 2 shown, the present utility model provides a special-shaped airbag device for preventing sudden gushing during shield tunneling reception, which includes a pre-buried portal ring beam 1 in a circular ring structure. The inside of the pre-buried portal ring beam 1 is used for the shield machine to pass through. A curtain rubber plate 2 and a special-shaped airbag 3 in a circular ring structure are fixedly arranged at the inner ring of the pre-buried portal ring beam 1. The special-shaped airbag 3 is communicated with an air charging pipe 4. The air charging pipe 4 is used to inflate the special-shaped airbag 3 to realize the expansion of the special-shaped airbag 3. The expanded special-shaped airbag 3 squeezes the curtain rubber plate 2, so that the inner ring of the curtain rubber plate 2 closely adheres to the outer contour surface of the shield machine shell.

[0028] Specifically, as Figure 1 and Figure 3 to Figure 5 shown, a circular groove 5 with a cross-section structure is arranged at the inner ring of the pre-buried portal ring beam 1. The cross-section of the curtain rubber plate 2 is in a "丿" structure. The outer edge of the curtain rubber plate 2 is fixedly connected to the side wall of the circular groove 5 through a circular fixing plate 6. The special-shaped airbag 3 is arranged in the circular groove 5. The circular fixing plate 6 is used to realize the fixed connection between the curtain rubber plate 2 and the side wall of the circular groove 5.

[0029] As a specific setting method of the circular fixing plate 6, a plurality of bolts are arranged on the circular fixing plate 6. The plurality of bolts pass through the circular fixing plate 6 and the curtain rubber plate 2 and are fixedly connected to the side wall of the circular groove 5.

[0030] Specifically, a circular ring-shaped baffle 7 is arranged at the inner ring of the pre-buried portal ring beam 1. One side surface of the baffle 7 is used to limit the horizontal expansion direction of the special-shaped airbag 3, so that the special-shaped airbag 3 expands downward after inflation, squeezes the curtain rubber plate 2, and makes the inner ring of the curtain rubber plate 2 closely adhere to the outer contour surface of the shield machine shell, reducing the risk of water gushing.

[0031] A plurality of screws fixedly connected to the inner ring of the pre-buried portal ring beam 1 are arranged on the baffle 7. The installation and fixation of the baffle 7 to the inner ring of the pre-buried portal ring beam 1 are realized through the screws.

[0032] There are multiple inflatable tubes 4, which are uniformly arranged on the circumferential outer wall of the pre-buried tunnel gate ring beam 1 with the axis of the pre-buried tunnel gate ring beam 1 as the center line. One end of each inflatable tube 4 passes through the pre-buried tunnel gate ring beam 1 and is connected to the special-shaped airbag 3, and the other end is connected to the external air source. The pre-buried tunnel gate ring beam 1, the annular fixing plate 6 and the baffle 7 are all made of steel.

[0033] A method for using a shield machine to receive a sudden surge prevention special-shaped airbag device is as follows: first, the construction of an inner lining wall is completed, and a whole ring of tunnel gate ring beams and an air filling tube 4 are pre-buried at the tunnel gate position according to the shield machine's starting size requirements; the debris on the surface of the pre-buried tunnel gate ring beam 1 is cleaned, and a curtain rubber plate 2 and a circular ring fixing plate 6 are sequentially installed and aligned at the tunnel gate ring beam groove by bolts, and sealing grease is injected between the curtain rubber plate 2 and the circular ring fixing plate 6; when the shield machine is received after exiting the tunnel, after the shield machine head passes through the tunnel gate ring beam groove, the air filling tube 4 is quickly opened to expand the airbag, so that the curtain rubber plate 2 is tightly attached to the outer side of the shield machine shell, and the airbag is fully expanded to compact the gap between the curtain rubber plate 2 and the shield machine shell, forming a sealed waterproof structure, achieving the waterproof and sand-proof effect to the greatest extent, reducing the risk of water gushing, and solving the problem of safety hazards in the receiving stage of the existing shield construction due to the lack of engineering protection devices.

Claims

1. A shield machine receiving anti-surge special-shaped airbag device, characterized in that: It includes a pre-buried tunnel gate ring beam with a circular structure, the interior of the pre-buried tunnel gate ring beam is used for the shield machine to pass through, and a curtain rubber plate and a special-shaped airbag with a circular structure are fixedly arranged at the inner ring of the pre-buried tunnel gate ring beam. The special-shaped airbag is connected with an inflation tube, and the inflation tube is used to inflate the special-shaped airbag to expand the special-shaped airbag. The expansion of the special-shaped airbag squeezes the curtain rubber plate, so that the inner ring of the curtain rubber plate is in close contact with the outer contour surface of the shield machine shell.

2. The shield receiving anti-surge special-shaped airbag device according to claim 1 is characterized in that: An annular groove with a cross-section in the shape of " " is provided at the inner ring of the embedded portal ring beam. The cross-section of the curtain rubber plate is in the shape of "丿". The outer edge of the curtain rubber plate is fixedly connected to the side wall of the annular groove through a circular fixing plate; the special-shaped airbag is arranged in the annular groove.

3. The shield receiving anti-surge special-shaped airbag device according to claim 2 is characterized in that: The annular fixing plate is provided with a plurality of bolts, and the plurality of bolts pass through the annular fixing plate and the cord rubber plate to be fixedly connected to the side wall of the annular groove.

4. The shield receiving anti-surge special-shaped airbag device according to claim 3 is characterized in that: A baffle with a circular ring structure is arranged at the inner ring of the embedded tunnel door ring beam, and one side surface of the baffle is used to limit the horizontal expansion direction of the special-shaped airbag.

5. The shield receiving anti-surge special-shaped airbag device according to claim 4 is characterized in that: The baffle is provided with a plurality of screws fixedly connected to the inner ring of the embedded hole door ring beam.

6. The shield receiving anti-surge special-shaped airbag device according to claim 5, characterized in that: There are multiple inflation tubes, which are uniformly arranged on the circumferential outer wall of the pre-buried tunnel gate ring beam with the axis of the pre-buried tunnel gate ring beam as the center line. One end of each inflation tube passes through the pre-buried tunnel gate ring beam to be connected with the special-shaped airbag, and the other end is connected with an external air source.

7. The shield receiving anti-surge special-shaped airbag device according to claim 5, characterized in that: The materials for making the embedded tunnel gate ring beam, the circular ring fixing plate and the baffle are all steel.

Images