A blowout preventer pipe segment

Abstract

The application discloses a shield method subway tunnel construction anti-spraying segment, which is used in the shield method tunnel construction of water-rich sand layer, silt type geological condition and underwater soft soil layer. The segment can effectively improve the stability of the formed tunnel, greatly save the grouting amount for stabilizing the tunnel, fill and extrude the surrounding soft soil body to the outside of the tunnel after the strip type grouting expansion filling bag outside the segment is grouted, and diffuse the grout to the surrounding soil body of the expansion filling bag. The expansion filling bag forms a high-strength water-blocking "hoop" ring, effectively blocks the water from the outside of the station when the shield machine enters and exits the station tunnel portal, reduces the "spraying" accident of the shield machine during the starting and receiving at the station tunnel portal position, effectively improves the safety of the shield starting and receiving, saves the measure cost, and has high economic value. The technology can also be used for the soft soil layer to enhance the integrity and stability of the formed tunnel.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and more particularly to an anti-surge pipe segment. Background Technology

[0002] Pipe jacking is a trenchless construction method, a technology for laying pipelines with little or no excavation. In pipe jacking, the jacking force generated by jacking equipment within the working pit overcomes the friction between the pipeline and the surrounding soil, pushing the pipeline into the ground at the designed slope, and then removing the excavated soil. After one section of pipe is jacked into the soil, the second section is lowered and the jacking continues. The principle is to use the thrust of the main jacking cylinder and the pipeline and intermediate sections to advance the tool pipe or tunneling machine from the working pit through the soil to the receiving pit where it is lifted. The pipeline follows closely behind the tool pipe or tunneling machine, buried between the two pits. Shield tunneling assembles the tunnel segments inside the shield machine. After each ring of segments is assembled, the shield machine's jacks move the assembled ring forward by one ring's distance before assembling the next ring. This process of assembling and connecting rings of segments forms the tunnel. Each ring of segments consists of six pieces.

[0003] In the construction of subway underground tunnels using the shield tunneling method, the tunnel boring machine (TBM) must pass through the portal at the station end both during the TBM's launch and arrival / receiving phases. This portal is located on the inner lining wall of the subway station end, closely adjacent to the underground diaphragm wall of the station's outer retaining structure. The TBM must pass through this portal in the inner lining wall to begin tunneling and to reach another station after completing the tunnel excavation in one section. This portal, along with the diaphragm wall outside the portal, forms a ring-shaped opening roughly the same size as the portal, allowing the TBM to pass through. Because the ring-shaped portal in the inner lining wall and the underground diaphragm wall is approximately 20cm larger than the outer diameter of the TBM, and there is a working gap of about 15cm between the outer side of the formed tunnel and the portal, groundwater and soil outside the station can easily seep into the station through this ring-shaped gap during TBM launch and arrival. This can cause leakage at the portal, or even water and soil inrush accidents, leading to major quality and safety incidents and significant economic losses.

[0004] Meanwhile, when using shield tunneling in soft soils such as water-rich sand layers and silt layers, the formed tunnel is prone to floating and swaying when encountering liquefied soil layers, resulting in poor stability. Water seepage is also likely to occur at the joints between the tunnel segments. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The present invention provides an anti-surge pipe segment to solve the existing technical problems.

[0006] The present invention adopts the following technical solution: an anti-surge pipe segment, including a pipe segment, and further including a strip-shaped injection expansion filling bag for preventing surge phenomena, and a matching mechanism for providing auxiliary support for the expanded strip-shaped injection expansion filling bag. The pipe segment has a placement groove, and multiple installation grooves are additionally provided in the placement groove. Each installation groove is provided with a strip-shaped injection expansion filling bag. An injection pipe is provided through the pipe segment, and the end of the injection pipe is connected to the strip-shaped injection expansion filling bag. A concave limiting block is provided at the end of the placement groove, and the placement groove is provided through.

[0007] Furthermore, the strip-shaped injection expansion filler bag has pre-drilled ventilation holes.

[0008] Furthermore, a threaded inner plug is provided inside the grouting pipe.

[0009] Furthermore, the placement groove is provided with a plurality of elastic resetters, and the elastic resetters are respectively arranged on both sides of the installation groove. The end of the tube segment is provided with a guide limiting block, and the cross-section of the guide limiting block is L-shaped.

[0010] Furthermore, a fixed cover plate, a flip support cover plate, and a movable cover plate are arranged sequentially from the center to both sides outside the placement groove. The fixed cover plate, the flip support cover plate, and the movable cover plate are all connected to the elastic reset device. A guide groove is provided on the movable cover plate. A movable cavity is provided at one end of the flip support cover plate. The cross-section of the movable cavity and the guide groove is L-shaped. A rotating column is provided on the inner surface of the flip support cover plate. The rotating column is arc-shaped. A hinge is provided between the flip support cover plate and the movable cover plate. A wedge is provided at the inner end of the flip support cover plate. The movable cover plate is made of soft material.

[0011] Furthermore, the movable cavity is divided into a large chamber and a small chamber according to its inner diameter. The inner diameter of the large chamber is larger than the outer diameter of the guide limiting block, and the inner diameter of the small chamber is equal to the inner diameter of the guide groove. The guide groove is slidably connected to the guide limiting block, and a gap is reserved between the top of the guide groove and the top of the guide limiting block.

[0012] Furthermore, the strip-shaped injection expansion filling bag is located in the gap between the fixed cover plate and the flip support cover plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] Firstly, since each ring segment is equipped with a placement slot and an installation slot, and the installation slots are positioned accordingly, after assembly, grout is injected into the filling bags from inside the tunnel after the tunnel boring machine exits the tail section. When the grouting pressure exceeds a certain level, the grout diffuses outward from the expansion filling bags. The strip-shaped grouting expansion filling bags in the grooves of the six segments in each ring form a stable and effective filling ring dam in the annular gap outside the tunnel, effectively blocking water from the rear side of the tunnel (the tunnel boring machine travels in the forward direction). Improvements have been made to prevent the disorderly diffusion of grout, effectively preventing external water from rushing into the station, saving the amount of synchronous grouting in the tunnel, and making shield launching and receiving safer, more scientific and economical. This increases the safety of shield launching and receiving. At the same time, because the strip-shaped grouting expansion filling bag has vent holes, the air inside the strip-shaped grouting expansion filling bag will be discharged through the vent holes in the early stage of grouting. At this time, the grout can be better filled into the strip-shaped grouting expansion filling bag, avoiding the phenomenon of voids. After the injection is completed, some grout will flow out through the vent holes, strengthening the connection between the strip-shaped grouting expansion filling bag and the fixed cover plate and the tunnel segment.

[0015] Secondly, during use, by setting up a cooperating mechanism, the fixed cover plate, the flipping support cover plate, and the movable cover plate in the cooperating mechanism can compensate for the defects in the placement slot, thereby ensuring that the tail of the tunnel boring machine can pass normally. At the same time, the three cover plates are all elastically connected to the segments. When tunneling is carried out in a more curved place, when the steel brush at the tail of the tunnel boring machine comes into contact with the three cover plates, the frictional resistance between the cover plates and the steel brush will be greatly reduced, thereby increasing the service life of the steel brush. Furthermore, during the grouting process, the flipping support cover plate and the movable cover plate will also change position. The changed flipping support cover plate, the strip grouting expansion filling bag, and the segment form a triangle. The flipping support cover plate can provide a supporting force for the strip grouting expansion filling bag, thereby increasing the stability of the strip grouting expansion filling bag.

[0016] In summary, this tunnel segment not only effectively reduces the wear of steel brushes during use, but also prevents water from entering the tunnel portal connecting the station and the tunnel during grouting and anti-blowout operations through the strip-shaped grouting expansion filling bag, thus achieving the purpose of preventing blowouts. It also saves on grout injection volume, reducing grout material by more than 60%, which is beneficial for the stability of the tunnel after it is formed. Furthermore, it improves the safety of shield tunneling during launch and reception at the station, and facilitates the stabilization of the formed tunnel. This technology can also be used in soft soil layers to stabilize the formed tunnel. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the segment structure from a first-view perspective of the present invention;

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 This is a schematic diagram of the second-view structure of the tube segment of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0023] Figure 6 This is a schematic diagram of the placement slot structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the rotating column position structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the strip-shaped grouting expansion filling bag structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the unfolded structure of the strip-shaped grouting expansion filling bag of the present invention.

[0027] Figure label:

[0028] 1. Segment; 11. Concave limiting block; 12. Placement groove; 13. Strip-shaped grouting expansion filling bag; 14. Guide limiting block; 15. Elastic resetter; 2. Coupling mechanism; 21. Fixed cover plate; 22. Flip support cover plate; 23. Movable cover plate; 24. Hinge; 25. Guide groove; 26. Rotating column; 27. Wedge block; 28. Injection pipe; 29. ​​Movable cavity. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The following is combined with Figures 1 to 9 As shown, this embodiment of the invention provides an anti-surge pipe segment 1, including a pipe segment 1, a strip-shaped injection expansion filler bag for preventing surges, and a mating mechanism 2 for providing auxiliary support to the expanded strip-shaped injection expansion filler bag. The pipe segment 1 has a placement groove 12, and multiple mounting grooves are additionally formed within the placement groove 12. Each mounting groove contains a strip-shaped injection expansion filler bag. An injection pipe 28 is inserted through the pipe segment 1, and the end of the injection pipe 28 is connected to the strip-shaped injection expansion filler bag. The placement groove 12 is a through-hole design. Because the placement groove 12 is a through-hole design, when the pipe segments are spliced, they will form a ring-shaped placement groove.

[0035] In operation, as described above, the segment 1 not only effectively reduces the wear of the steel brushes, but also features a concave limiting block 11 at the end of the placement groove 12. Furthermore, during grouting and anti-gushing, the strip-shaped grouting expansion filling bag 13 prevents water from entering the tunnel entrance connecting the station and the tunnel, thus achieving anti-gushing. It also saves on grout injection volume, reducing grout material by more than 60%, which is beneficial for the stability of the tunnel after formation. It enhances the safety of shield tunneling during launch and reception at the station, and facilitates the stability of the formed tunnel. This technology can also be used in soft soil layers to stabilize the formed tunnel.

[0036] Specifically, the strip-shaped injection expansion filler bag has pre-drilled air holes.

[0037] During operation, the air vents allow for the full expulsion of air from the strip-shaped injection expansion bag during grouting, thus facilitating the grouting process.

[0038] Specifically, a threaded inner plug is installed inside the grouting pipe.

[0039] Specifically, the placement groove 12 is provided with a plurality of elastic resetters 15, and the elastic resetters 15 are respectively provided on both sides of the installation groove. The end of the tube segment 1 is provided with a guide limiting block 14, and the cross-section of the guide limiting block 14 is L-shaped.

[0040] During operation, due to the installation of the elastic reset device 15, when the steel brush at the tail of the tunnel boring machine comes into contact with the three cover plates, all three cover plates can move, thereby reducing the friction of the steel brush.

[0041] Specifically, the placement groove 12 is provided with a fixed cover plate 21, a flip support cover plate 22, and a movable cover plate 23 arranged sequentially from the center to both sides. The fixed cover plate 21, the flip support cover plate 22, and the movable cover plate 23 are all connected to the elastic reset device 15. The movable cover plate 23 has a guide groove 25. The flip support cover plate 22 has a movable cavity 29 at one end, and the movable cavity 29 and the guide groove 25 have an L-shaped cross-section. The inner surface of the flip support cover plate 22 has a rotating column 26, which is arc-shaped. A hinge 24 is provided between the flip support cover plate 22 and the movable cover plate 23. The inner end of the flip support cover plate 22 has a wedge 27. The movable cover plate 23 is made of a soft material, which facilitates the deflection of the flip support cover plate 22.

[0042] Specifically, the movable cavity 29 is divided into a large cavity and a small cavity according to its inner diameter. The inner diameter of the large cavity is larger than the outer diameter of the guide limiting block 14, and the inner diameter of the small cavity is equal to the inner diameter of the guide groove 25. The guide groove 25 is slidably connected to the guide limiting block 14, and a gap is reserved between the top of the guide groove 25 and the top of the guide limiting block 14.

[0043] During operation, when the strip injection expansion filling bag initially expands, it will first push the flip support cover 22 and the movable cover 23 to move. When it moves to a certain position, the guide limit block 14 enters the large chamber, and the flip support cover 22 will deflect, thereby supporting the ring of the strip injection expansion filling bag after expansion.

[0044] Specifically, the strip-shaped injection expansion filling bag is located in the gap between the fixed cover plate 21 and the flip support cover plate 22.

[0045] Specifically, this facilitates the expansion of the strip injection expansion filler bag.

[0046] Working principle: First, the tunnel segment 1 is cast using a precast model. Then, the strip-shaped injection expansion filling bag and elastic resetter 15 are installed sequentially, along with the fixed cover plate 21, the flipping support cover plate 22, and the movable cover plate 23. During the tunnel boring machine (TBM) process, the six tunnel segments 1 are installed sequentially to form a ring. After installation, the steel brush at the tail of the TBM will contact the fixed cover plate 21, the flipping support cover plate 22, and the movable cover plate 23. An elastic resetter 15 is provided between the movable cover plate 23 and the pipe segment 1, allowing the positions of the fixed cover plate 21, the flip support cover plate 22, and the movable cover plate 23 to change. At this time, the steel brush is not rigidly connected to the fixed cover plate 21, the flip support cover plate 22, and the movable cover plate 23, thus effectively reducing the wear of the steel brush. Grouting is then performed on the strip-shaped injection expansion filling bag through the injection pipe 28. During the expansion process of the strip-shaped injection expansion filling bag, ventilation holes are provided in the bag. At this time, the air inside the strip injection expansion bag will be discharged through the vent. In the initial stage of expansion, the expanding strip injection expansion bag will abut against the wedge block 27. At this time, the flip support cover plate 22 and the movable cover plate 23 will be displaced under the action of the strip injection expansion bag. At this time, under the action of the movable cavity 29 and the guide limiting block 14, the flip support cover plate 22 can only move in the initial stage of expansion. When the expansion reaches a certain extent, that is, when the flip support cover plate 22 moves to a certain extent, the rotating column 26 connected to the flip support cover plate 22 is connected to the concave limiting block 11. At this time, the expansion of the strip injection expansion bag cannot cause the flip support cover plate 22 to move. However, under the action of the rotating column 26 and the concave limiting block 11, the flip support cover plate 22 will deflect, so that the strip injection expansion bag after expansion, the flip support cover plate 22 and the tube 1 form a triangle. At this time, the flip support cover plate 22 can provide an additional support force for the strip injection expansion bag.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A surge protection segment, comprising a segment (1), characterized in that; It also includes a strip injection expansion filling bag for preventing gushing, and a cooperating mechanism (2) for providing auxiliary support to the expanded strip injection expansion filling bag. The tube (1) has a placement groove (12) and multiple installation grooves are additionally provided in the placement groove (12). Each installation groove is provided with a strip injection expansion filling bag. An injection pipe (28) is provided through the tube (1). The end of the injection pipe (28) is connected to the strip injection expansion filling bag. A concave limiting block (11) is provided at the end of the placement groove (12). The placement groove (12) is provided through. The placement slot (12) is provided with a fixed cover plate (21), a flip support cover plate (22) and a movable cover plate (23) arranged sequentially from the center to both sides. The fixed cover plate (21), the flip support cover plate (22) and the movable cover plate (23) are all connected to the elastic reset device (15). The movable cover plate (23) is provided with a guide groove (25). The flip support cover plate (22) is provided with a movable cavity (29) at one end. The movable cavity (29) and the guide groove (25) have an L-shaped cross-section. The inner surface of the flip support cover plate (22) is provided with a rotating column (26). The rotating column (26) is arc-shaped. A hinge (24) is provided between the flip support cover plate (22) and the movable cover plate (23). A wedge (27) is provided at the inner end of the flip support cover plate (22). The active cavity (29) is divided into a large cavity and a small cavity according to the size of its inner diameter. The inner diameter of the large cavity is larger than the outer diameter of the guide limiting block (14), and the inner diameter of the small cavity is equal to the inner diameter of the guide groove (25). The guide groove (25) is slidably connected to the guide limiting block (14), and a gap is reserved between the top of the guide groove (25) and the top of the guide limiting block (14). The strip-shaped injection expansion filling bag is located in the gap between the fixed cover plate (21) and the flip support cover plate (22).

2. The anti-gushing pipe segment according to claim 1, characterized in that; The strip-shaped injection expansion filler bag has pre-drilled ventilation holes.

3. The anti-gushing pipe segment according to claim 1, characterized in that; A threaded inner plug is provided inside the injection tube (28).

4. The anti-gushing pipe segment according to claim 1, characterized in that; The placement groove (12) is provided with a number of elastic resetters (15), and the elastic resetters (15) are respectively provided on both sides of the installation groove. The end of the tube segment (1) is provided with a guide limit block (14), and the cross-section of the guide limit block (14) is L-shaped.

Images