A shield segment splicing device for subway construction

Abstract

The present invention discloses a shield segment splicing device for subway construction, which belongs to the technical field of subway construction. It includes a cylinder A and a cylinder B arranged in a left-right symmetrical structure, the outer ends of the annular outer wall of cylinder A and the annular outer wall of cylinder B are both in a circular linear equidistant structure with multiple circular pads embedded therein, a plug column is fixedly provided in the middle of the right wall of cylinder A, a slot is provided in the left wall of cylinder B relative to the position of the plug column, a through-opening is provided in the middle of the right end of the plug column, an inner cavity is provided at the right end of the slot, a base rod is coaxially fixedly connected to the middle of the right wall of the inner cavity, an extension rod is inserted in the middle of the left wall of the base rod, a clamping block is coaxially fixedly connected to the left end of the extension rod, a top block is coaxially fixedly provided at the left end of the clamping block, and a clamping groove and a circular groove are respectively provided on the upper and lower inner walls of the through-opening relative to the upper and lower ends of the clamping block and the upper and lower ends of the top block. The present invention not only improves the convenience of the shield segment connection method, but also greatly enhances the tightness of the connection between the longitudinal shield segments, and has strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of subway construction, and more specifically to a shield segment splicing device for subway construction. Background Art

[0002] The shield segment is the main assembly component of the shield construction and the innermost barrier of the tunnel. It is responsible for resisting soil pressure, groundwater pressure and some special loads. The shield segment is the permanent lining structure of the shield tunnel. The quality of the shield segment is directly related to the overall quality and safety of the tunnel, and affects the waterproof performance and durability of the tunnel. After the shield is advanced, the shield segments need to be quickly assembled into a ring. Based on the direction of the subway tunnel, the connection between the two shield segments connected longitudinally will be more difficult. During the production process of the shield segment, two holes will be symmetrically opened on its plane. The staff mostly use connecting bolts to connect the holes of the two shield segments to achieve the fixation between the longitudinally adjacent shield segments. However, this connection method will damage the inner wall of the hole. The shield segment is the top priority to ensure the safety of subway driving in subway construction. The staff should try to avoid damage to the shield segment. However, if the fixed rod is inserted into the hole and then simply spliced, it will cause the problem of insufficient fixation. In view of this, we propose a shield segment splicing device for subway construction. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] The object of the present invention is to provide a shield segment splicing device for subway construction to solve the problems raised in the above-mentioned background technology.

[0005] 2. Technical solution

[0006] A shield segment splicing device for subway construction comprises a cylinder A and a cylinder B which are arranged in a bilaterally symmetrical structure. The outer ends of the annular outer wall of the cylinder A and the annular outer wall of the cylinder B are both in annular linear structures with multiple circular pads embedded at equal intervals. The circular pads are hollow inside to form a cavity. The cavity has multiple compression springs A fixedly arranged at equal intervals in an arc shape. A plug post is fixedly arranged in the middle of the right wall of the cylinder A. A slot is provided on the left wall of the cylinder B relative to the position of the plug post. The plug post is plugged into the slot. A plurality of grooves are provided at equal intervals in annular shape on the left end of the outer wall of the plug post. A clamping plate is slidably connected to the inner wall of the groove through two symmetrically fixed compression springs B. A plate groove is provided on the left end of the inner wall of the slot relative to the position of the clamping plate. The clamping plate is plugged into the plate groove. A through opening is provided in the middle of the right end of the plug post. Two guide blocks are symmetrically fixedly arranged on the right end of the outer wall of the plug column relative to the upper and lower sides of the through-hole, and two guide grooves are arranged on the left end of the inner wall of the slot in an upper and lower symmetrical structure, and the guide block slides in cooperation with the guide grooves, an inner cavity is arranged on the right end of the slot, a base rod is coaxially fixedly connected to the middle part of the right wall of the inner cavity, an extension rod is inserted in the middle part of the left wall of the base rod, a compression spring C is fixedly arranged between the right end of the extension rod and the inner wall of the base rod, the extension rod slides in cooperation with the inside of the base rod, a clamping block is coaxially fixedly connected to the left end of the extension rod, and a top block is coaxially fixedly arranged on the left end of the clamping block, and a clamping groove and a circular groove are respectively arranged on the upper and lower inner walls of the through-hole relative to the upper and lower ends of the clamping block and the upper and lower ends of the top block, a plurality of through holes are arranged in annular linear and equidistant manner on the inner wall of the slot, and an extrusion block is inserted in the through hole.

[0007] Preferably, two sliding blocks are symmetrically fixed in the middle of the outer wall of the extrusion block, a sliding groove is provided on the inner wall of the through hole relative to the position of the sliding block, the sliding block slides in cooperation with the sliding groove, a plurality of annular grooves are linearly and evenly spaced at both ends of the outer wall of the extrusion block, a circular cavity is provided in the middle of the extrusion block relative to the position between two adjacent annular grooves, and a plurality of through grooves are provided in a circular shape and at equal intervals on the circumferential inner wall of the circular cavity.

[0008] Preferably, the right wall of the cylinder A fits tightly with the left wall of the cylinder B, and the circular pad is an arc-shaped structure with rounded corners at both ends.

[0009] Preferably, the outer side wall of the card plate is a curved surface structure, and the upper and lower inner wall edges of the through-hole are both rounded structures.

[0010] Preferably, the top block is a spherical structure, the left wall of the top block is squeezed and matched with the right end of the upper and lower inner walls of the through-hole, the circular groove is plug-fitted with the top block, the clamping block is a truncated cone structure with a small left side and a large right side, and the clamping block is clamped and matched with the clamping groove.

[0011] Preferably, the right end of the outer wall of the guide block is a curved structure, the inner wall of the guide groove is a slope structure that gradually shifts inward from left to right, the outer wall of the guide block is squeezed together with the inner wall of the guide groove, the inner cavity is a cylindrical structure with a diameter larger than the diameter of the slot, and the top surface of the guide block is gap-fitted with the top surface of the inner cavity.

[0012] Preferably, the length of the guide block is selected to meet the following rules: when the guide block completely slides out of the guide groove, the extension rod slides to the maximum stroke inside the base rod, and the top block squeezes the through opening to open to the upper and lower sides, so that the top block and the card block are squeezed into the circular groove and the card groove while the column continues to be inserted into the slot.

[0013] Preferably, when the top block and the clamping block are completely clamped in the circular groove and the inside of the clamping groove, the clamping plate at the left end of the outer wall of the plug column will also be clamped into the plate groove to further restrict the plug column.

[0014] Preferably, the extrusion block is made of rubber, the outer wall of the extrusion block is in sliding contact with the inner wall of the through hole, the slider is in sliding cooperation with the slide groove, and the inner end of the extrusion block is in extrusion cooperation with the left end of the outer wall of the plug column.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) The present invention is provided with a circular pad. When the staff connects two longitudinal shield segments, they can insert the cylinder A and the cylinder B of the device into the holes on the flat surfaces of the two segments in advance, and compress the spring A to squeeze the circular pad so that it exerts a strong squeezing force on the inner wall of the hole. In this way, the connection strength between the cylinder A and the cylinder B and the shield segment can be improved by increasing the friction between the circular pad and the inner wall of the hole, which is helpful for the subsequent longitudinal connection of the two shield segments through the present device.

[0018] (2) The present invention is provided with an inserting column and a slot. The inserting column first causes the top block to squeeze the clamping block and the extension rod to the right, so that the right end of the extension rod presses the compression spring C and retracts into the base rod. Under the elastic force of the compression spring C, the top block can squeeze the upper and lower sides of the right end of the inserting column along the through opening to both sides, so that the top block and the clamping block will be squeezed into the circular groove and the clamping groove. Under the toughness effect of the inserting column, the right end of the inserting column will wrap the top block and the clamping block. At the same time, the clamping plate located at the left end of the outer wall of the inserting column will also be stuck in the plate groove to further restrict the inserting column. Through such a structure, the inserting column and the slot cannot be pulled apart after the two shield segments are connected, which further enhances the connection strength between the cylinder A and the cylinder B, and further improves the connection tightness of the two shield segments.

[0019] (3) The present invention is provided with an extrusion block. Since the inner wall of the guide groove is an inclined structure that gradually shifts inward from left to right, the guide block will be squeezed by the guide groove to press the side of the plug column connected to it inward, and the right end of the plug column will be inclined toward the direction of the through-hole, so that a gap is generated between the outer wall of the right end of the plug column and the inner wall of the slot, thereby forming a space that is convenient for the extrusion block to deform, avoiding hard contact and breaking the extrusion block. The extrusion blocks at other positions are designed with rounded corners at the edges of the inner walls of the through-hole, so no hard contact will occur. When a plurality of annular grooves and circular cavities and through grooves on the inner wall of the circular cavity are provided on the extrusion block, the extrusion block can be deformed to a large extent, so that a mutual extrusion force can be generated between the plug column and the inner wall of the shield segment hole, so that the plug column is connected to another shield segment connected to the shield segment where it is located, thereby further improving the fixing firmness of the two shield segments and having strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the decomposition structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the circular pad of the present invention;

[0023] Figure 4 It is a schematic diagram of the exploded structure of the cylinder A of the present invention;

[0024] Figure 5 It is a schematic cross-sectional structural diagram of a cylinder B of the present invention;

[0025] Figure 6 It is a schematic diagram of the exploded structure of the base rod and the extension rod of the present invention;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the extrusion block of the present invention.

[0027] Explanation of the numbers in the figure: 1. Cylinder A; 2. Cylinder B; 3. Round pad; 4. Cavity; 5. Compression spring A; 6. Plug column; 7. Slot; 8. Groove; 9. Compression spring B; 10. Clamp plate; 11. Plate groove; 12. Through-hole; 13. Guide block; 14. Guide groove; 15. Inner cavity; 16. Base rod; 17. Extension rod; 18. Compression spring C; 19. Clamp block; 20. Top block; 21. Clamp groove; 22. Round groove; 23. Through-hole; 24. Extrusion block; 25. Slider; 26. Slide groove; 27. Ring groove; 28. Round cavity; 29. ​​Through-groove. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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.

[0031] See also Figure 1-7 , the present invention provides a technical solution:

[0032] A shield segment splicing device for subway construction comprises a cylinder A1 and a cylinder B2 which are arranged in a bilaterally symmetrical structure. The outer ends of the annular outer wall of the cylinder A1 and the annular outer wall of the cylinder B2 are both in an annular linear structure with equal spacing and are embedded with a plurality of circular pads 3. The circular pads 3 are hollow inside to form a cavity 4. The cavity 4 is in an arc shape and is fixed with a plurality of compression springs A5 at equal spacing. A plug column 6 is fixed in the middle of the right wall of the cylinder A1. A slot 7 is provided on the left wall of the cylinder B2 relative to the position of the plug column 6. The plug column 6 is plugged into the slot 7. The left end of the outer wall of the plug column 6 is in an annular structure with equal spacing. A plurality of grooves 8 are provided at a distance from each other, and the inner wall of the groove 8 is slidably connected with a card plate 10 through two compression springs B9 symmetrically fixed thereon. A plate groove 11 is provided at the left end of the inner wall of the slot 7 relative to the position of the card plate 10, and the card plate 10 is engaged with the plate groove 11. A through hole 12 is provided in the middle of the right end of the plug column 6, and two guide blocks 13 are symmetrically fixed at the right end of the outer wall of the plug column 6 relative to the upper and lower sides of the through hole 12. Two guide grooves 14 are provided at the left end of the inner wall of the slot 7 in a vertically symmetrical structure, and the guide block 13 is slidably engaged with the guide groove 14. The right side of the slot 7 An inner cavity 15 is opened at the end, a base rod 16 is coaxially fixedly connected to the middle of the right wall of the inner cavity 15, an extension rod 17 is inserted in the middle of the left wall of the base rod 16, a compression spring C18 is fixedly arranged between the right end of the extension rod 17 and the inner wall of the base rod 16, the extension rod 17 is slidably matched with the inside of the base rod 16, a clamping block 19 is coaxially fixedly connected to the left end of the extension rod 17, a top block 20 is coaxially fixedly arranged at the left end of the clamping block 19, a clamping groove 21 and a circular groove 22 are respectively opened on the upper and lower inner walls of the through-hole 12 relative to the upper and lower ends of the clamping block 19 and the upper and lower ends of the top block 20, and the slot 7 is fixedly provided with a compression spring C18. The wall is annular and linearly provided with a plurality of through holes 23 at equal intervals, an extrusion block 24 is inserted inside the through hole 23, two sliders 25 are symmetrically fixed on the middle of the outer wall of the extrusion block 24, a slide groove 26 is provided on the inner wall of the through hole 23 relative to the position of the slider 25, the slider 25 and the slide groove 26 are slidably matched, a plurality of annular grooves 27 are linearly provided at equal intervals on both ends of the outer wall of the extrusion block 24, a circular cavity 28 is provided in the middle of the extrusion block 24 relative to the position between two adjacent annular grooves 27, and a plurality of through grooves 29 are provided on the circumferential inner wall of the circular cavity 28 in annular shape and at equal intervals.

[0033] Specifically, the right wall of cylinder A1 fits tightly with the left wall of cylinder B2, and the round pad 3 is an arc-shaped structure with rounded corners at both ends. When the staff connects the two longitudinal shield segments, they can insert the cylinder A1 and cylinder B2 of the device respectively along the holes on the flat surfaces of the two. During the insertion process, the staff can use external tools to knock on the right wall of cylinder A1 or knock on the left wall of cylinder B2 to help the two to be inserted into the holes respectively. When the two are fully inserted, the elastic force of the compression spring A5 in the internal cavity 4 of the round pad 3 will compress the hole. The inner wall generates a strong squeezing pressure, so that the connection strength between cylinder A1 and cylinder B2 and the shield segment can be improved by increasing the friction between the round pad 3 and the inner wall of the hole, which is helpful for the subsequent longitudinal connection of the two shield segments through this device. After the installation of cylinder A1 and cylinder B2 is completed, the staff can use external lifting equipment to connect the two shield segments longitudinally, and the position of the column 6 in the middle of the right wall of cylinder A1 can be made corresponding to the slot 7, and then the column 6 will be inserted into the slot 7 and go deep into the inner cavity 15.

[0034] Furthermore, the outer wall of the card plate 10 is an arc surface structure, the card plate 10 is snap-fitted with the plate slot 11, and the upper and lower inner wall edges of the through-hole 12 are both rounded structures, thereby restricting the plug post 6 and preventing it from rotating.

[0035] Furthermore, further, the extension rod 17 is slidably matched with the base rod 16, the top block 20 is a hemispherical structure, the left wall of the top block 20 is squeezed and matched with the right end of the upper and lower inner walls of the through-hole 12, the circular groove 22 is plugged and matched with the top block 20, the clamping block 19 is a truncated cone structure with a small left and a large right, the clamping block 19 is snap-fitted with the clamping groove 21, the right end of the outer wall of the guide block 13 is an arc structure, the inner wall of the guide groove 14 is an inclined structure that gradually deviates inward from left to right, the outer wall of the guide block 13 is squeezed and matched with the inner wall of the guide groove 14, and the staff needs to pay attention to the accurate correspondence of the positions of the guide groove 14 and the guide block 13 when installing the cylinder A1 and the cylinder B2. The inner cavity 15 is a cylindrical structure with a diameter larger than the diameter of the slot 7, the top surface of the guide block 13 is gap-matched with the top surface of the inner cavity 15, and the right end of the plug 6 enters the inner cavity 15, due to the squeezing of the column 6 on the top block 20, the top block 20 will squeeze the block 19 and the extension rod 17 to the right, so that the right end of the extension rod 17 presses the compression spring C18 and retracts into the base rod 16. When most of the right end of the column 6 enters the inner cavity 15, the top block 20 will squeeze the upper and lower sides of the right end of the column 6 to both sides along the through opening 12 under the elastic force of the compression spring C18, and then the top block 20 and the block 19 will be squeezed into the circular groove 22 and the card groove 21. After that, under the toughness effect of the column 6, the right end of the column 6 will wrap the top block 20 and the block 19. At the same time, the card plate 10 located at the left end of the outer wall of the column 6 will also be stuck in the plate groove 11 to further restrict the column 6. Through such a structure, the column 6 and the slot 7 cannot be pulled out after the two shield segments are connected.

[0036] The length of the guide block 13 can be further reasonably designed, and the length of the guide block 13 is selected to meet the following rules: when the guide block 13 completely slides out of the guide groove 14, the extension rod 17 slides inside the base rod 16 to the maximum stroke, and the top block 20 squeezes the through opening 12 to open to the upper and lower sides, so that the top block 20 and the clamping block 19 are squeezed into the circular groove 22 and the clamping groove 21 during the process of the column 6 continuing to be inserted into the slot 7, shortening the sliding stroke of the column 6 in the slot 7, thereby improving the efficiency of the connection between the two shield segment rings.

[0037] It is worth mentioning that the extrusion block 24 is made of rubber, the outer wall of the extrusion block 24 is in sliding contact with the inner wall of the through hole 23, the slider 25 is in sliding cooperation with the slide groove 26, and the inner end of the extrusion block 24 is in squeezing cooperation with the left end of the outer wall of the plug column 6. When the cylinder B2 is installed, the extrusion block 24 will slide toward the inside of the slot 7 along the direction of the slider 25 and the slide groove 26. In this way, it can be avoided that the outer end of the extrusion block 24 and the shield segment are in hard contact during the insertion of the cylinder B2, causing the extrusion block 24 to break. Subsequently, when the plug column 6 is inserted into the slot 7, the end of the guide block 13 will also be inserted into the guide groove 14. As the inner wall of the guide groove 14 gradually shifts toward the middle, the guide block 13 will also be squeezed by the guide groove 14 to press the side of the plug column 6 connected to it toward the inside, and the right end of the plug column 6 will Tilt toward the through-port 12, so that a gap will be generated between the outer wall of the right end of the column 6 and the inner wall of the slot 7, so that the extrusion block 24 has space to deform, avoiding hard contact and breaking the extrusion block 24. The extrusion blocks 24 at other positions are not in hard contact because the edges of the inner walls of the through-port 12 are all rounded. When the column 6 is fully inserted, the extrusion block 24 will be deformed under the extrusion of the left outer wall of the column 6. Since there are multiple annular grooves 27 and circular cavities 28 and through grooves 29 on the inner wall of the circular cavity 28, the extrusion block 24 can be deformed to a large extent. In this way, a mutual extrusion force can be generated between the column 6 and the inner wall of the shield segment hole, so that the column 6 is connected to another shield segment connected to the shield segment where it is located.

[0038] Working principle: When the staff connects two longitudinal shield segments, they can insert the cylinder A1 and cylinder B2 of the device respectively along the holes on the flat surfaces of the two. During the insertion process, the staff can use external tools to knock on the right wall of cylinder A1 or knock on the left wall of cylinder B2 to help the two to be inserted into the holes respectively. When the two are fully inserted, the elastic force of the compression spring A5 in the internal cavity 4 of the round pad 3 will generate a strong squeezing force on the inner wall of the hole. In this way, the connection strength between cylinder A1 and cylinder B2 and the shield segment can be improved by increasing the friction between the round pad 3 and the inner wall of the hole, which is helpful for the subsequent longitudinal connection of the two shield segments through this device. After the cylinder A1 and cylinder B2 are installed, the staff can Use external lifting equipment to connect the two longitudinal shield segments, and the position of the column 6 in the middle of the right wall of the cylinder A1 can be aligned with the slot 7, and then the column 6 will be inserted into the slot 7 and go deep into the inner cavity 15. When the right end of the column 6 enters the inner cavity 15, due to the squeezing of the top block 20 by the column 6, the top block 20 will squeeze the block 19 and the extension rod 17 to the right, so that the right end of the extension rod 17 presses the compression spring C18 and retracts into the base rod 16. When most of the right end of the column 6 enters the range of the inner cavity 15, the top block 20 will squeeze the upper and lower sides of the right end of the column 6 to both sides along the through opening 12 under the effect of the elastic force of the compression spring C18, and then the top block 20 and the block 19 will squeeze into the circular groove 22 and the card groove 21. Under the toughness effect of the plug column 6, the right end of the plug column 6 will wrap the top block 20 and the clamping block 19. At the same time, the clamping plate 10 located at the left end of the outer wall of the plug column 6 will also be stuck in the plate groove 11 to further restrict the plug column 6. Through such a structure, the plug column 6 and the slot 7 cannot be pulled apart after the two shield segments are connected, which further enhances the connection strength between the cylinder A1 and the cylinder B2, and further improves the connection tightness of the two shield segments. In addition, when installing the cylinder A1 and the cylinder B2, the staff needs to pay attention to the accurate correspondence of the position of the guide groove 14 and the guide block 13. When the cylinder B2 is installed, the extrusion block 24 will slide toward the inside of the slot 7 along the direction of the slider 25 and the slide groove 26. This can avoid the cylinder B2 from being inserted into the process The outer end of the extrusion block 24 makes hard contact with the shield segment, causing the extrusion block 24 to break. Subsequently, when the column 6 is inserted into the slot 7, the end of the guide block 13 is also inserted into the guide groove 14. As the inner wall of the guide groove 14 gradually shifts toward the middle, the guide block 13 is also squeezed by the guide groove 14 to press the side of the column 6 connected to it inward, and the right end of the column 6 is inclined toward the through-hole 12. In this way, a gap is generated between the outer wall of the right end of the column 6 and the inner wall of the slot 7, so that the extrusion block 24 has space for deformation to avoid hard contact and breaking of the extrusion block 24. The extrusion blocks 24 at other positions are designed with rounded corners at the edges of the inner walls of the through-hole 12, so there will be no hard contact. When the column 6 is fully inserted,The extrusion block 24 will be deformed under the extrusion of the left outer wall of the plug column 6. Since there are multiple annular grooves 27 and circular cavities 28 and through grooves 29 on the inner wall of the circular cavity 28, the extrusion block 24 can be deformed to a large extent. In this way, a mutual extrusion force can be generated between the plug column 6 and the inner wall of the shield segment hole, so that the plug column 6 is connected to another shield segment connected to the shield segment where it is located, which further improves the fixing firmness of the two shield segments and has strong practicality.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A shield segment splicing device for subway construction, comprising a cylinder A (1) and a cylinder B (2) arranged in a bilaterally symmetrical structure, characterized in that: The annular outer wall of the cylinder A (1) and the outer end of the annular outer wall of the cylinder B (2) are both in an annular linear structure with multiple circular pads (3) embedded at equal intervals. The circular pads (3) are hollow inside to form a cavity (4). The cavity (4) is internally fixed with multiple compression springs A (5) in an arc shape and at equal intervals. A plug post (6) is fixed in the middle of the right wall of the cylinder A (1). A slot (7) is opened on the left wall of the cylinder B (2) at a position relative to the plug post (6). The plug post (6) is plugged into the slot (7). The plug post (6) is inserted into the slot (7). ) The left end of the outer wall of the slot (7) is provided with a plurality of grooves (8) at equal intervals in a circular shape, the inner wall of the groove (8) is slidably connected with a card plate (10) through two compression springs B (9) fixedly arranged symmetrically, the left end of the inner wall of the slot (7) is provided with a plate groove (11) at a position relative to the card plate (10), the card plate (10) is engaged with the plate groove (11), the middle part of the right end of the plug post (6) is provided with a through opening (12), the right end of the outer wall of the plug post (6) is symmetrically fixed with two guide holes at positions on the upper and lower sides of the through opening (12) The slot (7) has a guide block (13), the left end of the inner wall of the slot (7) is provided with two guide grooves (14) in a vertically symmetrical structure, the guide block (13) and the guide groove (14) are slidably matched, the right end of the slot (7) is provided with an inner cavity (15), the middle part of the right wall of the inner cavity (15) is coaxially fixedly connected with a base rod (16), the middle part of the left wall of the base rod (16) is inserted with an extension rod (17), a compression spring C (18) is fixedly provided between the right end of the extension rod (17) and the inner wall of the base rod (16), and the extension rod (17) The extension rod (17) is coaxially fixedly connected to a clamping block (19) at the left end thereof, and a top block (20) is coaxially fixedly arranged at the left end thereof. The upper and lower inner walls of the through-hole (12) are respectively provided with clamping grooves (21) and circular grooves (22) at positions corresponding to the upper and lower ends of the clamping block (19) and the upper and lower ends of the top block (20). The inner wall of the slot (7) is provided with a plurality of through holes (23) at equal intervals in an annular linear manner, and an extrusion block (24) is inserted into the through hole (23).

2. The shield segment splicing device for subway construction according to claim 1 is characterized in that: Two sliders (25) are symmetrically fixedly arranged in the middle of the outer wall of the extrusion block (24); a slide groove (26) is provided on the inner wall of the through hole (23) at a position relative to the slider (25); the slider (25) and the slide groove (26) are slidably matched; a plurality of annular grooves (27) are linearly and evenly spaced at both ends of the outer wall of the extrusion block (24); a circular cavity (28) is provided in the middle of the extrusion block (24) at a position relative to the position between two adjacent annular grooves (27); and a plurality of through grooves (29) are provided in annular shape and at equal intervals on the circumferential inner wall of the circular cavity (28).

3. The shield segment splicing device for subway construction according to claim 1 is characterized in that: The right wall of the cylinder A (1) is tightly fitted with the left wall of the cylinder B (2), and the circular pad (3) is an arc-shaped structure with rounded corners at both ends.

4. The shield segment splicing device for subway construction according to claim 1 is characterized in that: The outer wall of the clamping plate (10) is a curved surface structure, and the upper and lower inner wall edges of the through opening (12) are both rounded structures.

5. The shield segment splicing device for subway construction according to claim 1 is characterized in that: The top block (20) is a spherical structure, the left wall of the top block (20) is squeezed and matched with the right end of the upper and lower inner walls of the through opening (12), the circular groove (22) is plugged and matched with the top block (20), the clamping block (19) is a truncated cone structure with a small left side and a large right side, and the clamping block (19) is clamped and matched with the clamping groove (21).

6. The shield segment splicing device for subway construction according to claim 5 is characterized in that: The right end of the outer wall of the guide block (13) is a curved surface structure, the inner wall of the guide groove (14) is a slope structure that gradually deviates inward from left to right, the outer wall of the guide block (13) and the inner wall of the guide groove (14) are squeezed together, the inner cavity (15) is a cylindrical structure with a diameter larger than the diameter of the slot (7), and the top surface of the guide block (13) and the top surface of the inner cavity (15) are clearance-matched.

7. The shield segment splicing device for subway construction according to claim 6 is characterized in that: The length of the guide block (13) is selected to meet the following rule: when the guide block (13) completely slides out of the guide groove (14), the extension rod (17) slides inside the base rod (16) to the maximum stroke, and the top block (20) squeezes the through opening (12) to open to the upper and lower sides, so that the top block (20) and the clamping block (19) are squeezed into the circular groove (22) and the clamping groove (21) during the process of the insertion column (6) continuing to be inserted into the slot (7).

8. The shield segment splicing device for subway construction according to claim 7 is characterized in that: When the top block (20) and the clamping block (19) are completely clamped in the circular groove (22) and the clamping groove (21), the clamping plate (10) at the left end of the outer wall of the plug post (6) will also be clamped in the plate groove (11) to further restrict the plug post (6).

9. The shield segment splicing device for subway construction according to claim 2, characterized in that: The extrusion block (24) is made of rubber, the outer wall of the extrusion block (24) is in sliding contact with the inner wall of the through hole (23), the slider (25) is in sliding cooperation with the slide groove (26), and the inner end of the extrusion block (24) is in extrusion cooperation with the left end of the outer wall of the plug post (6).

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