Protective device for automatic pressure maintaining system of shield tunneling machine

Abstract

The utility model provides a protection device for an automatic pressure maintaining system of a shield tunneling machine. The protection device comprises a connecting pipe communicated with the automatic pressure maintaining system and the shield tunneling machine soil bin, a pipe opening of the connecting pipe is located on a breast plate of the shield tunneling machine soil bin, the protection device further comprises a seamless steel pipe elbow matched with the pipe opening of the connecting pipe, and one end of the seamless steel pipe elbow is fixed to the pipe opening of the connecting pipe in a butt joint mode. The other end of the seamless steel pipe elbow faces downwards, a horn mouth is arranged at an end opening of the seamless steel pipe elbow, the small-opening end of the horn mouth is in butt joint and fixed with the end opening of the seamless steel pipe elbow, a grating is fixed on the large-opening end face of the horn mouth, and a floating ball is movably arranged in the horn mouth. The automatic pressure maintaining system is simple in structure, the problem that the automatic pressure maintaining system is damaged due to the fact that muddy water intrudes through an automatic connecting pipeline when the position of muck in a soil cabin is high in an existing automatic pressure maintaining system is solved, and the risk that the automatic pressure maintaining system is damaged in the shield tunneling process is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground engineering construction, in particular to a protection device suitable for an automatic pressure-maintaining system of an earth cabin in shield construction. Background Art

[0002] With the rapid development of society and cities, underground rail transit has become an important way to relieve urban traffic pressure. In the shield construction of underground rail transit, the pneumatic assisted excavation method is widely used due to its high precision of face pressure control, stable pressure, and many advantages such as reducing the cutter head torque and thrust. How to reduce the cost of using the automatic pressure maintenance system and reduce the failure rate of the automatic pressure maintenance system has always been an important factor affecting the efficiency and safety of shield construction.

[0003] Since the automatic pressure-maintaining system has high control accuracy and its control components are of relatively high precision, during use, the debris, mud and water in the earth chamber of the shield machine often invade the automatic pressure-maintaining system pipelines and damage the control components, thereby causing the automatic pressure-maintaining system to fail and become damaged. It is necessary to remove the damaged automatic pressure-maintaining system control components for replacement or repair, which increases the cost of equipment failure repair parts, labor and materials. In addition, the failure of the control components may cause the failure of pressure control in the earth chamber, resulting in the risk of ground subsidence due to loss of pressure, ground penetration due to overpressure, or damage to the main drive seal. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides a protection device for the automatic pressure maintaining system of a shield machine, which can prevent mud and water from entering the automatic pressure maintaining system and causing damage to the automatic pressure maintaining system, thereby reducing various influences and problems on excavation construction, and can improve the working stability of the automatic pressure maintaining system and reduce construction risks.

[0005] In order to solve the above technical problems, the utility model provides a shield machine automatic pressure maintaining system protection device, including an automatic pressure maintaining system, which is connected to the shield machine soil bin through a connecting pipe, and the pipe mouth of the connecting pipe is located on the breast plate of the shield machine soil bin. The protection device includes a seamless steel pipe elbow matching the pipe mouth of the connecting pipe, one end of the seamless steel pipe elbow is butt-jointed and fixed to the pipe mouth of the connecting pipe, the other end of the seamless steel pipe elbow faces downward, and a bell mouth is provided at its port, the small mouth end of the bell mouth is butt-jointed and fixed to the port of the seamless steel pipe elbow, a grille is fixed on the large mouth end face of the bell mouth, a float is provided in the bell mouth, and the float is movably placed in the bell mouth.

[0006] The better technical solution of the utility model is as follows: the bell mouth faces vertically downward, the float is located on the grille, and the diameter of the float is smaller than the inner diameter of the large end of the bell mouth, and greater than or equal to the inner diameter of the small end of the bell mouth; the float can move freely in the inner cavity of the bell mouth and will not fall out, thereby realizing the opening and closing of the pipe mouth.

[0007] The better technical solution of the utility model is as follows: the seamless steel pipe elbow adopts a 90° elbow with a wall thickness of 5mm, a material of Q355B, and a diameter of DN80; the bell mouth is made of 5mm thick Q355B steel plate by winding and welding to form a tapered mouth, and the diameter of the small end matches the pipe diameter of the seamless steel pipe elbow. One end of the seamless steel pipe elbow is welded to the pipe mouth of the connecting pipe, and the other end is welded to the small end of the bell mouth.

[0008] The better technical solution of the utility model is as follows: the grille is made of round steel coils with a diameter of 10 mm and welded, the outer diameter of the outer ring matches the diameter of the large end of the bell mouth, the inner diameter of the inner ring is 60 mm, and the inner ring and the outer ring are welded and connected to form a whole by short round steels; the outer ring of the grille is welded and fixed to the large end of the bell mouth.

[0009] The preferred technical solution of the utility model is as follows: the floating ball is a hollow rubber ball made of nitrile rubber.

[0010] The protective device of the utility model comprises a seamless steel pipe elbow, a bell mouth, a grille and a hollow rubber ball. By welding the protective device to the pipe mouth of the automatic pressure maintaining system of the earth cabin wall of the shield machine, when the position of the slag and muddy water in the earth cabin rises to the position of the pipe mouth of the automatic pressure maintaining system, the hollow rubber ball in the protective device will move upward and approach the inner surface of the bell mouth under the action of buoyancy, causing the pipe cross section to become smaller and the gas flow rate to become larger, which will quickly discharge the muddy water here. At the same time, the interior of the device as a whole can form a large bubble in the muddy water under the action of the compressed air of the pressure maintaining system, preventing the muddy water from entering the automatic pressure maintaining system pipeline, thereby achieving the purpose of protecting the automatic pressure maintaining system control component. At the same time, the hollow rubber ball has good impact resistance and a large activity space in the device. It is not easy to be hit, damaged or stuck by foreign objects such as slag, which can effectively reduce the failure rate of the device. At the same time, the hollow rubber ball has good compression performance and can be quickly replaced through the center hole of the grille, reducing maintenance time.

[0011] Beneficial effects of the utility model:

[0012] (1) The utility model changes the structure of the currently commonly used directly open unprotected automatic connection pipe mouth, and uses buoyancy and bubbles formed by the exhaust of the automatic pressure-maintaining system to prevent muddy water in the earth compartment of the shield machine from entering the automatic pressure-maintaining system, thereby protecting the automatic pressure-maintaining system;

[0013] The utility model adopts the buoyancy of the hollow rubber ball to realize the free up and down movement of the hollow rubber ball in the bell mouth, thereby reducing the cross-sectional area of ​​the passage at the bell mouth, increasing the flow rate of compressed air, and achieving the effect of blowing away mud and water; at the same time, the rubber material has a good resistance effect to the splashing slag formed by the roller squeezing the rock in the soil cabin, slowing down the wear and tear, and increasing the service life of the hollow rubber ball.

[0014] (3) The protective device of the utility model is a small component. When it is actually used on site, it can be welded and arranged at the pipe mouth that needs to be protected as needed. It is flexible to use. In addition, as a small component, it can be quickly replaced after the hollow rubber ball is worn out, which is convenient for maintenance, reduces the time required for maintenance, and reduces the work intensity of workers.

[0015] The utility model discloses adopts the method for the automatic pressure-maintaining system of the existing shield machine to solve the problem that the automatic pressure-maintaining system is damaged due to mud and water ingress during the air pressure-assisted excavation of the existing shield machine, avoids various influences and problems caused by the damage of the automatic pressure-maintaining system on the excavation construction, improves the working stability of the automatic pressure-maintaining system through structural improvements, reduces the maintenance frequency, saves expensive equipment maintenance costs, and reduces construction risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model;

[0017] Figure 2 This is a front view of another working state of the utility model;

[0018] Figure 3 It is a bottom view of the utility model.

[0019] In the figure: 1—chest plate of the soil bin of the shield machine, 2—connecting pipe, 3—seamless steel pipe elbow, 4—bell mouth, 5—grating, 6—hollow rubber ball. DETAILED DESCRIPTION

[0020] The following is a further description of the automatic pressure-maintaining system protection device for a shield machine proposed by the utility model in conjunction with the accompanying drawings. Figures 1 to 3 The drawings are all examples of embodiments, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the embodiments of the utility model. The technical solutions shown in the drawings are specific solutions of the embodiments of the utility model and are not intended to limit the scope of the utility model to be protected. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The embodiment provides a shield machine automatic pressure maintaining system protection device, such as Figures 1 to 3As shown, it includes an automatic pressure-maintaining system, which is connected to the shield machine soil bin through a connecting pipe 2, and the pipe mouth of the connecting pipe 2 is located on the breast plate 1 of the shield machine soil bin, including a connecting pipe 2 of the automatic pressure-maintaining system, and the pipe mouth of the connecting pipe 2 is located on the breast plate 1 of the shield machine front shield soil bin, and the connecting pipe 2 is used to spray air toward the shield machine soil bin to maintain pressure; the protective device includes a seamless steel pipe elbow 3 that matches the pipe mouth of the connecting pipe 2, and the seamless steel pipe elbow 3 is located in the shield soil bin, and one end is butt-jointed with the pipe mouth of the connecting pipe 2 and welded The seamless steel pipe elbow 3 is integrated with the other end thereof downward, and a bell mouth 4 is provided at its port, the bell mouth 4 is vertically downward, the small end of the bell mouth 4 is butt-jointed with the port of the seamless steel pipe elbow 3 and welded as a whole, a grille 5 is fixed on the large end face of the bell mouth 4, a float 6 is provided in the bell mouth 4, the float 6 is located on the grille 5, and the diameter of the float 6 is smaller than the inner diameter of the large end of the bell mouth 4, and greater than or equal to the inner diameter of the small end of the bell mouth 4, the float can move freely in the inner cavity of the bell mouth to realize the opening and closing of the pipe mouth.

[0022] In the embodiment, the seamless steel pipe elbow 3 is a 90° elbow with a wall thickness of 5mm, a material of Q355B, and a diameter of DN80; the bell mouth 4 is made of 5mm thick Q355B steel plate by winding and welding to form a tapered mouth, and the diameter of its small mouth end matches the diameter of the seamless steel pipe elbow 3; the grille 5 is made of round steel with a diameter of 10mm by round welding, and the outer diameter of its outer ring matches the diameter of the large mouth end of the bell mouth 4, the inner diameter of the inner ring is 60mm, and the inner ring and the outer ring are connected by short round steel welding to form a whole; the outer ring of the grille 5 is welded and fixed to the large mouth end of the bell mouth 4. The float 6 is a hollow rubber ball made of nitrile rubber. The outer diameter is 90mm and the wall thickness is 10mm. The hollow rubber ball 6 is pressed from the middle round hole of the grille 5 into the space between the bell mouth 4 and the grille 5 by external force, and the hollow rubber ball can move freely in the space to realize the opening and closing of the pipe mouth.

[0023] In the embodiment, the seamless steel pipe elbow 3, bell mouth 4, grille 5, and hollow rubber ball 6 form an integral component, and the seamless steel pipe elbow 3 of the protective device is butt-welded to the pipe mouth of the connecting pipe 2 on the wall of the shield machine soil bin while maintaining a vertical downward direction. When the position of the slag, mud and water in the shield machine soil bin reaches the position of the float 6, under the action of buoyancy, the float 6 moves up in the bell mouth 4 and approaches the inner surface of the bell mouth, thereby causing the pipe cross-section to become smaller. At this time, the gas flow rate coming out of the pipeline becomes larger, and the mud and water here will be quickly discharged. At the same time, the internal part of the device as a whole can form a large bubble at the seamless steel pipe elbow under the action of the compressed air of the pressure maintaining system, thereby preventing mud and water from entering the automatic pressure maintaining system pipeline, thereby achieving the purpose of protecting the automatic pressure maintaining system control component.

[0024] The above description is only a description of the preferred embodiment of the utility model, and is not any limitation to the scope of the utility model. Any changes and modifications made by technicians in the field of the utility model based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A shield machine automatic pressure-maintaining system protection device, comprising an automatic pressure-maintaining system, wherein the automatic pressure-maintaining system is connected to a shield machine soil bin via a connecting pipe (2), wherein the pipe opening of the connecting pipe (2) is located on a breast plate (1) of the shield machine soil bin, and wherein: The protective device comprises a seamless steel pipe elbow (3) matching the pipe mouth of the connecting pipe (2), one end of the seamless steel pipe elbow (3) is fixedly connected to the pipe mouth of the connecting pipe (2), the other end of the seamless steel pipe elbow (3) faces downward, and a bell mouth (4) is provided at its end, the small end of the bell mouth (4) is fixedly connected to the end of the seamless steel pipe elbow (3), a grille (5) is fixed on the large end face of the bell mouth (4), a floating ball (6) is provided in the bell mouth (4), and the floating ball (6) is movably placed in the bell mouth (4).

2. A shield machine automatic pressure maintaining system protection device according to claim 1, characterized in that: The bell mouth (4) faces vertically downward, the float (6) is located on the grille (5), and the diameter of the float (6) is smaller than the inner diameter of the large end of the bell mouth (4) and greater than or equal to the inner diameter of the small end of the bell mouth (4).

3. A shield machine automatic pressure maintaining system protection device according to claim 1 or 2, characterized in that: The seamless steel pipe elbow (3) is a 90° elbow with a wall thickness of 5 mm, a material of Q355B, and a diameter of DN80; the bell mouth (4) is made of a 5 mm thick Q355B steel plate by winding and welding to form a tapered mouth, the diameter of the small end of which matches the diameter of the seamless steel pipe elbow (3); one end of the seamless steel pipe elbow (3) is welded to the pipe mouth of the connecting pipe (2), and the other end is welded to the small end of the bell mouth (4).

4. A shield machine automatic pressure maintaining system protection device according to claim 1 or 2, characterized in that: The grille (5) is made by welding a round steel coil with a diameter of 10 mm. The outer diameter of the outer ring matches the diameter of the large end of the bell mouth (4). The inner diameter of the inner ring is 60 mm. The inner ring and the outer ring are connected by welding of short round steel to form a whole. The outer ring of the grille (5) is welded and fixed to the large end of the bell mouth (4).

5. A shield machine automatic pressure maintaining system protection device according to claim 1 or 2, characterized in that: The floating ball (6) is a hollow rubber ball made of nitrile rubber.

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