Screw conveyor feed opening water burst prevention structure of earth pressure balance shield machine
By adding the buffer structure of the shield machine spiral machine, the problem that the gate cannot be closed by the poured water, and the sealing and excavation safety of the spiral machine is realized.
Patent Information
- Application Number
- CN202421336949.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-06-13
AI Technical Summary
When the shield machine is excavated in a water-rich area, the water influx phenomenon causes the pressure of the screw machine's discharge gate to be too high and cannot be closed normally, resulting in seal failure and formation losses.
Increase the buffer structure at the pile of the spiral machine, including the buffer, diversion cavity, and activity floating. By reducing the pressure of the gate of the lower material, avoid the problem that the gate cannot be closed.
Effectively reduce the pressure of the sperm mouth of the spiral machine, ensure that the gate can be closed smoothly, keeps sealing, and avoids the destructive effects of water.
Smart Images
Figure CN222414859U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of large-scale construction equipment, and in particular relates to a water gushing prevention structure for a screw machine feed port of an earth pressure balance shield machine. Background Art
[0002] The shield machine is a special engineering machine that uses the shield method to excavate tunnels. Its main function is to use the shield of the shield machine to protect the tunnel from being destroyed by the collapse of the surrounding rock and soil while excavating the tunnel, and to carry out tunnel lining operations simultaneously.
[0003] When the shield machine is excavating, it uses the cutter on the rotating cutter head to cut the rock and soil, and at the same time opens the soil bin and soil discharge mechanism in the shield machine to discharge the cut soil to the belt conveyor, which then transports it to the soil box of the muck truck and finally transports it to the ground through the shaft. After the shield machine excavates a distance of one ring, the assembly machine starts to assemble the single-layer lining segments to form the tunnel in one go.
[0004] In the prior art, the screw machine is the main engineering machinery for transporting slag. As a channel for transporting slag out of the excavation chamber of the earth pressure balance shield, it plays an important role in maintaining the balance of the excavation chamber, the stability of the face and the safety of excavation. However, since the shield machine often encounters water-rich areas during the excavation process, the abundant groundwater causes water gushing, which causes the gate pressure of the screw machine's feed port to be too high, resulting in the problem of being unable to close normally, the screw machine's seal fails, and due to the pressure, quicksand and silt will flow into the seal failure point, which will lead to formation loss. Utility Model Content
[0005] The purpose of the utility model is to address the above-mentioned problems in the existing technology and to propose a water-gushing prevention structure for the discharge port of a screw machine of an earth pressure balance shield machine. A buffer structure is added to the discharge port of the screw machine to reduce the gate pressure of the discharge port and avoid the problem that the gate cannot be closed.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is specifically as follows:
[0007] A water-gushing prevention structure for a screw machine feed port of an earth pressure balance shield machine comprises a screw machine body, a feed port arranged at the rear end of the screw machine body, and a buffer structure arranged outside the feed port; the buffer structure comprises a buffer ring connected to the screw machine body, and a plurality of diverter cavities are arranged in the buffer ring; a first diverter cavity arranged at the top is provided with a liquid outlet connected to the screw machine body; a circulation channel is provided between the first diverter cavity and a second diverter cavity arranged at the side, and a movable float is provided in the first diverter cavity, and a plurality of blocking rods are connected to the movable float, and a first plug adapted to the liquid outlet and a second plug adapted to the circulation channel are respectively provided on the plurality of blocking rods.
[0008] Furthermore, the circulation channel is in a bell-mouth shape, and a plug limiting ring is provided at the entrance of the circulation channel.
[0009] Furthermore, a plurality of blocking rods are connected to the movable float in an inverted V shape.
[0010] Furthermore, the second diversion chamber is provided with a pressure relief channel.
[0011] Furthermore, a docking port adapted to the feed opening is provided at the bottom of the buffer ring.
[0012] Furthermore, the blocking rod is connected to a flow limiting plate below the first plug, and the flow limiting plate extends into the screw machine body.
[0013] Compared with the prior art, the utility model has the following advantages: the utility model connects a buffer ring to the tail end of the screw machine body. When water gushing occurs, the pressure inside the screw machine body increases, and the buffer ring reduces the pressure inside the screw machine body, so that the discharge port gate of the screw machine body can be closed smoothly, ensuring that the seal does not fail, thereby reducing the destructiveness of the water gushing. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 A schematic diagram of the anti-water inrush structure of the screw feed port of the earth pressure balance shield machine provided by the utility model Figure 1 ;
[0016] Figure 2 A schematic diagram of the anti-water inrush structure of the screw feed port of the earth pressure balance shield machine provided by the utility model Figure 2 .
[0017] Figure numerals: 1. screw machine body; 2. feed port; 3. first diversion chamber; 4. second diversion chamber; 5. first plug; 6. movable float; 7. plugging rod; 8. second plug; 9. liquid outlet; 10. circulation channel; 11. flow limiting plate. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.
[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0020] In the description of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.
[0021] In addition, the terms “first”, “second”, “third”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.
[0022] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.
[0025] like Figure 1-Figure 2As shown, a water inrush prevention structure for a screw machine discharge port of an earth pressure balance shield machine comprises a screw machine body 1, a discharge port 2 arranged at the tail end of the screw machine body 1, and a buffer structure arranged outside the discharge port 2; the buffer structure comprises a buffer ring connected to the screw machine body 1, and a plurality of diverter chambers are arranged in the buffer ring; a first diverter chamber 3 arranged at the top is provided with a liquid outlet 9 connected to the screw machine body 1; a circulation channel 10 is provided between the first diverter chamber 3 and a second diverter chamber 4 arranged on the side, and an active float 6 is provided in the first diverter chamber 3, and a plurality of blocking rods 7 are connected to the active float 6, and a first plug 5 adapted to the liquid outlet 9 and a second plug 8 adapted to the circulation channel 10 are respectively provided on the plurality of blocking rods 7.
[0026] Compared with the prior art, in the prior art, since the shield machine is excavated underground, it often encounters muddy water layers containing sand and gravel or soil layers with high water content during the excavation process. When the amount of water in the soil layer is large, water gushing is likely to occur. And since the unearthed port of the existing screw conveyor is controlled by a gate, when encountering water gushing or sand gushing, the gushing mud and sand act on the gate plate of the gate, increasing the resistance of the gate plate closing, and it cannot be closed normally. In the utility model, in order to solve this problem, a buffer structure is arranged on the outside of the screw machine body 1, and the buffer structure is provided with a connecting port from the top of the screw machine body 1, and the plugging head is controlled to be pulled up and dropped by setting a float, so that the screw machine body 1 is depressurized and an alarm is given in time through the buffer ring, avoiding the phenomenon of water gushing, and the gate of the screw machine discharge port 2 cannot be closed normally, causing serious safety hazards. And the plugging head can be pulled out by the float controlled by buoyancy, and the plugging is re-blocked when the buoyancy disappears, reducing the control components, simple structure and low cost.
[0027] The circulation channel 10 is in a bell-mouth shape, and a plug stopper ring is provided at the entrance of the circulation channel 10. A plurality of blocking rods 7 are connected to the movable float 6 in an inverted V shape. The first diversion chamber 3 and the second diversion chamber 4 are opened and closed by the two blocking rods 7 on the float.
[0028] The second flow dividing chamber 4 is provided with a pressure relief passage which leads to the screw machine body 1 and is provided with an electric control gate valve.
[0029] The bottom of the buffer ring is provided with a docking port adapted to the feed opening 2 .
[0030] The blocking rod 7 is connected to a limiting plate 11 below the first plug 5, and the limiting plate 11 extends into the screw machine body 1. When the first diversion chamber 3 and the second diversion chamber 4 reach the limit, the float in the first diversion chamber 3 rises to the limit, driving the limiting plate 11 to rest against the liquid outlet 9 again, so as to prevent the buffer ring from being damaged at the connection with the screw machine body 1 due to excessive pressure.
[0031] In specific use, when excavation work is carried out in a water-rich area, the buffer structure provided by the utility model is connected to the tail end of the screw machine body 1, and the liquid outlet 9 of the buffer structure is connected to the screw machine body 1. In the initial state, the liquid outlet 9 is blocked by the first plug, and the flow channel 10 between the first diversion chamber 3 and the second diversion chamber 4 is blocked by the second plug. When the water output increases, the pressure in the screw machine body 1 will gradually increase, the mud will lift the first plug and enter the first diversion chamber 3 from the liquid outlet 9, and the mud in the first diversion chamber 3 will gradually increase, which will drive the float to rise. When the float rises to a certain height, it will pull out the second piston rod, and the second diversion chamber 4 will share the pressure in the second diversion chamber 4. When the second diversion chamber 4 is opened, an alarm structure should be set to remind the staff to pay attention, and after the second diversion chamber 4 reaches the limit, the float gradually rises to the top, at this time, the limiting plate 11 is against the liquid outlet 9. The pressure in the screw machine body 1 is effectively reduced through the action of multiple diversion chambers, which effectively avoids the problem that the gate of the feeding port 2 of the screw machine body 1 cannot be closed, reduces the occurrence of gushing, and avoids the damage of gushing water.
[0032] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A water inrush prevention structure for a screw feed port of an earth pressure balance shield machine, characterized in that: The invention comprises a screw machine body (1), a feed port (2) arranged at the rear end of the screw machine body (1), and a buffer structure arranged outside the feed port (2); the buffer structure comprises a buffer ring connected to the screw machine body (1), and a plurality of diversion chambers are arranged in the buffer ring; a first diversion chamber (3) arranged at the top is provided with a liquid outlet (9) connected to the screw machine body (1); a circulation channel (10) is provided between the first diversion chamber (3) and a second diversion chamber (4) arranged at the side, and a movable float (6) is provided in the first diversion chamber (3), and a plurality of blocking rods (7) are connected to the movable float (6), and a first plug (5) adapted to the liquid outlet (9) and a second plug (8) adapted to the circulation channel (10) are respectively provided on the plurality of blocking rods (7).
2. The water inrush prevention structure for the screw feed port of the earth pressure balance shield machine according to claim 1 is characterized in that: The circulation channel (10) is in a bell-mouth shape, and a plug limiting ring is provided at the entrance of the circulation channel (10).
3. The water inrush prevention structure for the screw feed port of the earth pressure balance shield machine according to claim 1 is characterized in that: A plurality of blocking rods (7) are connected to the movable float (6) in an inverted V shape.
4. The water inrush prevention structure for the screw feed port of the earth pressure balance shield machine according to claim 1, characterized in that: The second flow diversion chamber (4) is provided with a pressure relief channel.
5. The water inrush prevention structure for the screw feed port of the earth pressure balance shield machine according to claim 1, characterized in that: The bottom of the buffer ring is provided with a docking port adapted to the feed opening (2).
6. The water inrush prevention structure for the screw feed port of the earth pressure balance shield machine according to claim 1, characterized in that: The blocking rod (7) is connected to a flow limiting plate (11) below the first plug (5), and the flow limiting plate (11) extends into the screw machine body (1).