A concrete subway pipe segment and its combined connection structure

Abstract

The present invention relates to the technical field of subway pipe segments, and in particular to a concrete subway pipe segment and its combined connection structure, wherein the four corners of the pipe segment are chamfered portions, and the inner arc surface of the pipe segment is provided with four first recessed portions and two second recessed portions; the outer arc surface of the pipe segment is provided with four third recessed portions and two fourth recessed portions; when staggered joint assembly is adopted, a gap is formed at the convergence of the longitudinal joint and the annular joint, an inner circular recess is formed on the inner side of the gap, and an outer circular recess is formed on the outer side of the gap; the combined connection structure of the concrete subway pipe segment also includes a number of locking pieces, a number of plugs and a number of reinforcing anchor rods. The concrete subway pipe segment has good structural integrity, excellent bearing capacity and waterproof performance, is easy to process and has low manufacturing cost; when the staggered joint assembly process is adopted for installation, the locking pieces can be used for precise positioning and firm connection, the force distribution between adjacent pipe segments is balanced, the joints have good compactness, and the corners are chamfered, which solves the problem of easy damage to the corners and reduces the production and construction costs.

Description

Technical Field

[0001] The invention relates to the technical field of subway pipe segments, and in particular to a concrete subway pipe segment and a combined connection structure thereof. Background Art

[0002] The subway segment is a prefabricated component used to assemble into a ring structure during the tunneling process of the shield machine. It plays a role in supporting and stabilizing the tunnel and is a key component in the construction of subway tunnels. At present, based on the structural design adopted, the subway segment mainly relies on bolted connection in the assembly process. Although this fixing method has many technical advantages, its inherent limitations cannot be ignored. Specifically, it is necessary to reserve bolt holes on the subway segment, which weakens the integrity of the overall structure of the segment and has an adverse effect on the bearing capacity and waterproof performance. The reserved size control requirements of the bolt hole are high, and it affects the efficient subsequent concrete pouring and steel bar binding, increasing the technical difficulty and processing cost in the production process. More importantly, the matching mechanism of the bolt and the bolt hole is difficult to achieve high-precision positioning and locking when providing the connection between the segments, resulting in uneven force distribution between adjacent segments, and it is difficult to ensure the compactness of the joints, which leads to frequent leakage, misalignment and joint opening, affecting the long-term stability and safety of the subway tunnel. Furthermore, the shortcomings of the existing subway segments in structural design are also reflected in the fact that the four corners generally adopt a right-angle design, which is very easy to be damaged during the processing, transportation and installation of the segments. Especially in complex construction environments, the breakage rate of the segment corners remains high, which directly pushes up the construction cost; at the same time, the staggered joints formed at the segment corners during installation increase the difficulty of waterproofing treatment, which is the main source of leakage problems. This defect is particularly prominent in areas with high groundwater pressure.

[0003] In view of this, the existing subway segments have technical defects in structural design and connection methods, which urgently need to be solved through technological innovation and optimization. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a concrete subway segment with strong structural integrity, good strength and anti-seepage performance, and especially capable of avoiding corner damage.

[0005] At the same time, the present invention also provides a concrete subway pipe segment combined connection structure capable of improving installation positioning accuracy and firmness.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] A concrete subway pipe segment comprises a pipe segment formed by pouring concrete, wherein a steel bar skeleton is arranged inside the pipe segment, and is characterized in that: the four corners of the pipe segment are chamfered portions; on the inner arc surface of the pipe segment, four first recessed portions distributed on the inner sides of the four chamfered portions, and two second recessed portions distributed on the inner sides of two longitudinal ends are arranged; on the outer arc surface of the pipe segment, four third recessed portions distributed on the outer sides of the four chamfered portions, and two fourth recessed portions distributed on the outer sides of the two longitudinal ends are arranged; the third recessed portions and the fourth recessed portions are both provided with protruding positioning pins, and the positioning pins are fixedly connected to the steel bar skeleton.

[0008] A combined connection structure of concrete subway segments, comprising:

[0009] A plurality of concrete subway segments are assembled by staggered seams. At the confluence of the longitudinal seam and the annular seam, two chamfered portions on the two segments and a longitudinal end portion on the other segment jointly form a triangular notch. On the inner side of the notch, two first recessed portions on the two segments and a second recessed portion on the other segment jointly form an inner circular recessed seat. On the outer side of the notch, two third recessed portions on the two segments and a fourth recessed portion on the other segment jointly form an outer circular recessed seat. The bottoms of the inner circular recessed seat and the outer circular recessed seat are both planar, and the planes where the bottoms of the inner circular recessed seat and the outer circular recessed seat located on the inner and outer sides of the same notch are parallel. In the outer circular recessed seat, the positioning pins fixed on the third recessed portion and the fourth recessed portion are perpendicular to the bottom of the outer circular recessed seat.

[0010] A plurality of locking members, the locking members comprising a fixed locking disk and a movable locking disk respectively located in the outer circular recess and the inner circular recess, the fixed locking disk being provided with a positioning hole matched with the positioning pin, an outer sleeve perpendicular to the fixed locking disk being fixed at the center, the outer sleeve being located in the corresponding notch; an inner sleeve perpendicular to the movable locking disk being fixed at the center, the movable locking disk being provided with a center hole communicating with the inner sleeve, the inner sleeve being located inside the outer sleeve and the two being threadedly matched; a sealing gasket being provided between the fixed locking disk and the bottom of the outer circular recess, and a sealing gasket being provided between the movable locking disk and the bottom of the inner circular recess;

[0011] A plurality of plugs, which are installed and fixed on the central holes of some movable locking disks to seal the central holes;

[0012] A plurality of reinforcement anchor rods, each of which comprises a rod body, a threaded rod extending forward being fixedly connected to the front end of the rod body, a rear rotating sleeve being rotatably fixed on the rod body, the rear rotating sleeve being unable to produce axial movement, a conical head being fixed to the front end of the threaded rod, a front rotating sleeve being sleeved on the threaded rod and matching with the thread thereof, a plurality of groups of folding arms being connected between the rear rotating sleeve and the front rotating sleeve; in an initial state, the folding arms are in an extended state and abut against the four sides of the threaded rod, and when the front rotating sleeve moves backward, the folding arms can eventually be distributed radially around the threaded rod; an external threaded section is provided at the rear of the rod body, and the external threaded section can be fastened to the inner sleeve by threads.

[0013] Furthermore, the movable locking disk is provided with a screwing mechanism cooperating with a screwing tool; the fixed locking disk and the movable locking disk are both disc-shaped, and the screwing mechanism is an eccentric hole opened on the end face of the movable locking disk, and the number of the eccentric holes is at least two.

[0014] Furthermore, a grouting hole is provided at the rear end of the rod body, a discharge hole is provided at the front end of the rod body, and the interior of the rod body is hollow so that the grouting hole is communicated with the discharge hole.

[0015] Furthermore, the rear rotating sleeve and the front rotating sleeve are provided with an equal number of hinged seats, and the folding arm includes two linked connecting rods, the other end of one connecting rod is hingedly fixed to the hinged seat of the rear rotating sleeve, and the other end of the other connecting rod is hingedly fixed to the hinged seat of the front rotating sleeve;

[0016] Furthermore, among the two connecting rods, a resistance plate is fixed on the side of one of the connecting rods away from the threaded rod to increase its rotational resistance, thereby preventing the rear rotating sleeve, the front rotating sleeve and the folding arm from rotating synchronously with the rod body when the rod body is rotated, and failing to exert the expected folding deformation function.

[0017] Compared with the prior art, the concrete subway segment and its combined connection structure in the present invention have the following beneficial technical effects:

[0018] 1. When manufacturing the concrete subway segment, no bolt holes need to be reserved, and the overall structural integrity of the segment is good, so that the bearing capacity and waterproof performance can be guaranteed; the chamfered portion, the first recessed portion, the second recessed portion, the third recessed portion and the fourth recessed portion and other auxiliary structures are all located outside the segment, and can be precisely formed by relying on existing mold technology, which is easy to process and has low manufacturing cost.

[0019] 2. When the concrete subway segments are installed using the staggered assembly process, the notches, inner circular recesses, and outer circular recesses formed after assembly can cooperate with the fasteners in all directions, which can ensure the positioning accuracy and firmness of the segment installation. The force distribution between adjacent segments is balanced, and the joints have good compactness. It can effectively curb problems such as leakage, misalignment, and joint opening, thereby improving the long-term stability and safety of the subway tunnel.

[0020] 3. The four corners of this concrete subway segment are chamfered to reduce the abruptness of the corners, effectively solving the problem of easy damage to the corners of the previous segments, and indirectly reducing production and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of concrete subway segments.

[0023] Figure 2 This is a schematic diagram of the structure of the concrete subway segment in another direction.

[0024] Figure 3 Schematic diagram of the coordination between the locating pin and the steel bar skeleton.

[0025] Figure 4 This is a schematic diagram of the inner structure of the concrete subway segments when they are assembled.

[0026] Figure 5 This is a schematic diagram of the outer structure of the concrete subway segments when they are assembled.

[0027] Figure 6 It is a schematic diagram of the structure of the locking member.

[0028] Figure 7 It is a schematic diagram of the structure of the locking member in another direction.

[0029] Figure 8 It is a schematic diagram of the matching structure between the inner side of the concrete subway segment and the locking parts.

[0030] Fig. 9 It is a schematic diagram of the matching structure between the outer side of the concrete subway segment and the locking parts.

[0031] Fig.10 Schematic diagram of the overall structure of the reinforcement anchor.

[0032] Fig.11 Schematic diagram of the structure for reinforcing the front end of the anchor rod.

[0033] Fig.12 It is a structural schematic diagram of the folding arm in the folded state.

[0034] Fig.13 It is a schematic diagram of the coordination status of the plug, reinforcement anchor rod, locking piece and pipe segment.

[0035] In the figure: 1. pipe segment, 2. second recessed portion, 3. first recessed portion, 4. chamfered portion, 5. third recessed portion, 6. fourth recessed portion, 7. positioning pin, 8. steel bar skeleton, 9. annular seam, 10. longitudinal seam, 11. notch, 12. inner circular recess, 13. outer circular recess, 14. fixed locking plate, 15. outer sleeve, 16. inner sleeve, 17. eccentric hole, 18. movable locking plate, 19. sealing gasket, 20. positioning hole, 21. center hole, 22. grouting hole, 23. external threaded section, 24. rod body, 25. discharge hole, 26. rear rotating sleeve, 27. threaded rod, 28. conical head, 29. front rotating sleeve, 30. folding arm, 31. resistance plate, 32. articulated seat, 33. plug. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1 , Figure 2 , Figure 3 As shown, this embodiment discloses a concrete subway pipe segment, which includes a pipe segment 1 formed by pouring concrete. The pipe segment 1 is in an arc-shaped sheet shape. According to the requirements of block design, a corresponding arc is adopted. A steel skeleton 8 is provided in the pipe segment 1. The four corners of the pipe segment 1 are chamfered portions 4. The chamfered portions 4 can be C-shaped or R-shaped, aiming to reduce the abruptness of the four corners; according to the construction requirements, the end surface of the pipe segment 1 can be provided with a waterproof coating, an elastic sealing strip and a water-expanding water-stop ring to meet the waterproof and anti-seepage requirements; on the inner arc surface of the pipe segment 1, there is a There are four first recessed portions 3 distributed on the inner sides of the four chamfered portions 4, and two second recessed portions 2 distributed on the inner sides of the two longitudinal ends; on the outer arc surface of the pipe segment 1, there are four third recessed portions 5 distributed on the outer sides of the four chamfered portions 4, and two fourth recessed portions 6 distributed on the outer sides of the two longitudinal ends; the third recessed portions 5 and the fourth recessed portions 6 are both provided with protruding positioning pins 7, and the positioning pins 7 are fixedly connected to the steel skeleton 8. The positioning pins 7 are made of high-quality steel. When the steel skeleton 8 is manufactured, the positioning pins 7 and the steel skeleton 8 are welded together.

[0038] See also Figure 4 , Figure 5 As shown, when the staggered joint assembly process is used for construction, the joints between adjacent segments 1 in the same ring are usually called longitudinal joints 10, and the joints between adjacent rings are usually called annular joints 9. At the convergence of the longitudinal joints 10 and the annular joints 9, three segments 1 distributed in two adjacent rings are involved, wherein two chamfered portions 4 on two segments 1 and a longitudinal end portion on another segment 1 jointly form a triangular notch 11, and inside the notch 11, two first recessed portions 3 on the two segments 1 and a second recessed portion 2 on another segment 1 jointly form an inner circular recessed portion 11. The seat 12, on the outside of the notch 11, is formed by two third recessed portions 5 on the two tube segments 1 and a fourth recessed portion 6 on the other tube segment 1 to form an outer circular recessed seat 13; the bottoms of the inner circular recessed seat 12 and the outer circular recessed seat 13 are both planar, and the planes where the bottoms of the inner circular recessed seat 12 and the outer circular recessed seat 13 located on the inner and outer sides of the same notch 11 are located are parallel; in the outer circular recessed seat 13, the positioning pins 7 fixed on the third recessed portion 5 and the fourth recessed portion 6 are both perpendicular to the bottom of the outer circular recessed seat 13.

[0039] Based on the above structure adopted by the concrete subway segment, the currently mature and common staggered assembly process is adopted for installation during construction. During the installation process, as the segments are installed one by one, corresponding notches, inner circular recesses and outer circular recesses will be formed; the inner circular recesses and the outer circular recesses are connected through the notches and are distributed on the inner and outer sides of the segment ring body. Based on this structural feature, the corresponding segments can be locked and fixed in combination with the current fastener technology, thereby meeting the construction requirements of the subway shield technology.

[0040] When manufacturing the concrete subway segment, no bolt holes need to be reserved, and the overall structural integrity of the segment is good, so that the bearing capacity and waterproof performance can be guaranteed; the chamfered portion, the first recessed portion, the second recessed portion, the third recessed portion and the fourth recessed portion and other auxiliary structures are all located on the outside of the segment, and can be precisely formed by relying on existing mold technology, which is easy to process and has a low manufacturing cost.

[0041] When the concrete subway segment is installed by adopting the staggered joint assembly process, the notch, inner circular recess and outer circular recess and other structures formed after the assembly can cooperate with the fasteners in all directions, so as to ensure the positioning accuracy and firmness of the segment installation, balance the force distribution between adjacent segments, and have good joint compactness, which can effectively curb the problems of leakage, misalignment and joint opening, and improve the long-term stability and safety of the subway tunnel.

[0042] The four corners of the concrete subway segment are chamfered to reduce the abruptness of the corners, effectively solving the problem of easy damage to the corners of the previous segments, and indirectly reducing production and construction costs.

[0043] At the same time, this embodiment also provides a combined connection structure based on the concrete subway segment, which includes:

[0044] Several segments 1, see Figure 4 , Figure 5 As shown, the segments 1 are assembled by staggered seams. At the confluence of the longitudinal seam 10 and the annular seam 9, the two chamfered portions 4 on the two segments 1 and a longitudinal end portion on the other segment 1 jointly form a triangular notch 11; on the inner side of the notch 11, the two first recessed portions 3 on the two segments 1 and a second recessed portion 2 on the other segment 1 jointly form an inner circular recess 12; on the outer side of the notch 11, the two third recessed portions 5 on the two segments 1 and a fourth recessed portion 6 on the other segment 1 jointly form an outer circular recess 13; the bottoms of the inner circular recess 12 and the outer circular recess 13 are both planar, and the corresponding planes of the bottoms of the inner circular recess 12 and the outer circular recess 13 are parallel; in the outer circular recess 13, the positioning pins 7 fixed on the third recessed portion 5 and the fourth recessed portion 6 are perpendicular to the bottom of the outer circular recess 13;

[0045] Several locking parts, see Figure 6-Figure 9 As shown, the locking member includes a fixed locking disk 14 and a movable locking disk 18 which are respectively located in the outer circular recess 13 and the inner circular recess 12. The fixed locking disk 14 is provided with a positioning hole 20 which cooperates with the positioning pin 7. The center of the fixed locking disk 14 is fixed with an outer sleeve 15 which is perpendicular to it, and the outer sleeve 15 is located in the corresponding notch 11; the movable locking disk 18 is provided with a screwing mechanism which cooperates with the screwing tool, the center of the movable locking disk 18 is fixed with an inner sleeve 16 which is perpendicular to it, and the movable locking disk 18 is provided with a center hole 21 which communicates with the inner sleeve 16, and the inner sleeve 16 is located inside the outer sleeve 15 and the two are threadedly matched; a sealing is provided between the fixed locking disk 14 and the bottom of the outer circular recess 13. Gasket 19: A sealing gasket 19 is provided between the movable locking plate 18 and the bottom of the inner circular recess 12. Based on the setting of the sealing gasket 19, on the one hand, the stress change caused by thermal expansion and contraction in the matching structure can be buffered to prevent the local cracking of the pipe segment 1 due to excessive stress. On the other hand, the longitudinal seam 10 and the annular seam 9 formed during the assembly of the pipe segment 1 are combined at the notch 11. The sealing gasket 19 can achieve a good anti-seepage effect and effectively solve the defect of easy water seepage at the intersection of the longitudinal seam 10 and the annular seam 9. Since the fixed locking plate 14 and the movable locking plate 18 are respectively located in the outer circular recess 13 and the inner circular recess 12, that is, they are installed in an embedded manner, the matching accuracy of the pipe segment 1 and the locking member can be guaranteed, and the compactness of the matching can be improved.

[0046] Several plugs 33, such as Fig.13As shown, the plug 33 is installed and fixed on the center hole of the part of the movable locking plate 18 to seal the center hole; when the pipe segment 1 is installed and constructed and subsequently anti-seepage, reinforcement and other maintenance operations are performed, the plug 33 at the corresponding position can be removed according to actual needs, and the grouting operation of mortar and anti-seepage materials can be completed using the center hole, thereby reducing the number of openings on the pipe segment 1 and avoiding structural damage to the pipe segment 1;

[0047] Several reinforcement anchors, see Figure 7 , Figure 10-13 As shown, the reinforcement anchor rod comprises a rod body 24, a threaded rod 27 extending forward is fixedly connected to the front end of the rod body 24, a rear rotating sleeve 26 is rotatably fixed on the rod body 24, the rear rotating sleeve 26 cannot produce axial movement, a conical head 28 is fixed to the front end of the threaded rod 27, a front rotating sleeve 29 matching with the thread thereof is sleeved on the threaded rod 27, and a plurality of folding arms 30 are connected between the rear rotating sleeve 26 and the front rotating sleeve 29; in the initial state, the folding arms 30 are stretched and abut against the threaded rod 27, when the front rotating sleeve 29 moves backward, all the folding arms 30 are deformed to the folded state at the same time, and finally can be radially distributed around the threaded rod 27; the front end of the reinforcement anchor rod can pass through the central hole 21 of the movable locking plate 18 and the inner sleeve 16, and enter the soil or rock mass that can penetrate the outer side of the pipe segment 1, and the rear part of the rod body 24 is provided with an external thread section 23, and the external thread section 23 and the inner sleeve 16 can be connected by thread fastening; according to the construction requirements, when it is necessary to install the reinforcement anchor rod When fixing the anchor rod, the locking piece at the appropriate position can be selected to complete the quick installation of the reinforcement anchor rod. The specific operation method is: the front end of the reinforcement anchor rod passes through the central hole 21 of the movable locking plate 18 and the inner sleeve 16, enters the outside of the pipe segment 1, and uses the power equipment to push the rod body 24 forward. After the external thread section 23 is matched with the inner sleeve 16, the rod body 24 is rotated to make the external thread section 23 continue to move forward along the inner sleeve 16. Since the front rotating sleeve 29, the rear rotating sleeve 26 and the folding arm 30 can all be matched with the rod body 2 4 relative rotation, under the action of external resistance, the front rotating sleeve 29, the rear rotating sleeve 26 and the folding arm 30 will not rotate synchronously with the rod body 24, so that the front rotating sleeve 29 and the threaded rod 27 produce relative rotation, so that the front rotating sleeve 29 moves backward relative to the threaded rod 27, and finally, after the external thread section 23 is fastened to the inner sleeve 16, the folding arm 30 is radially distributed around the threaded rod 27, thereby increasing the contact range with the rock mass or soil, thereby providing a relatively stable support effect for the segment 1.

[0048] Further, such as Figure 6 , Figure 7 As shown, the fixed locking disk 14 and the movable locking disk 18 are both in the shape of a disk, and the screwing mechanism is an eccentric hole 17 opened on the end surface of the movable locking disk 18, and the number of the eccentric holes 17 is at least two.

[0049] Further, such as Fig.10 , Fig.11 As shown, the rear end of the rod body 24 is provided with a grouting hole 22, the front end of the rod body 24 is provided with a discharge hole 25, and the interior of the rod body 24 is hollow, so that the grouting hole 22 is communicated with the discharge hole 25; thus, after the reinforcement anchor rod is installed, the installation stability can be further improved by grouting technology.

[0050] Further, such as Fig.11 , Fig.12 As shown, the rear rotating sleeve 26 and the front rotating sleeve 29 are provided with an equal number of hinge seats 32, and the folding arm 30 includes two linked connecting rods, the other end of one connecting rod is hingedly fixed to the hinge seat 32 of the rear rotating sleeve 26, and the other end of the other connecting rod is hingedly fixed to the hinge seat 32 of the front rotating sleeve 29; further, among the two connecting rods, a resistance sheet 31 is fixed on the side of one of the connecting rods away from the threaded rod 27 to increase its rotation resistance, thereby preventing the rear rotating sleeve 26, the front rotating sleeve 29 and the folding arm 30 from rotating synchronously with the rod body 24 when the rod body 24 is rotated, and failing to exert the expected folding deformation function.

Claims

1. A combined connection structure of concrete subway segments, characterized in that: include: A plurality of concrete subway pipe segments, wherein the concrete subway pipe segments include pipe segments formed by concrete casting, a steel skeleton is arranged inside the pipe segments, and the four corners of the pipe segments are chamfered portions; on the inner arc surface of the pipe segment, four first recessed portions distributed on the inner sides of the four chamfered portions, and two second recessed portions distributed on the inner sides of the two longitudinal ends are arranged; on the outer arc surface of the pipe segment, four third recessed portions distributed on the outer sides of the four chamfered portions, and two fourth recessed portions distributed on the outer sides of the two longitudinal ends are arranged; the third recessed portions and the fourth recessed portions are both provided with protruding positioning pins, and the positioning pins are fixedly connected to the steel skeleton; the concrete subway pipe segments are assembled by staggered seams, and at the confluence of the longitudinal seams and the annular seams, the two chamfered portions on the two pipe segments are The corner and a longitudinal end portion of the other tube segment jointly form a triangular notch, and on the inner side of the notch, two first recessed portions on the two tube segments and a second recessed portion on the other tube segment jointly form an inner circular recessed seat, and on the outer side of the notch, two third recessed portions on the two tube segments and a fourth recessed portion on the other tube segment jointly form an outer circular recessed seat; the bottoms of the inner circular recessed seat and the outer circular recessed seat are both planar, and the planes where the bottoms of the inner circular recessed seat and the outer circular recessed seat located on the inner and outer sides of the same notch are parallel; in the outer circular recessed seat, the positioning pins fixed on the third recessed portion and the fourth recessed portion are perpendicular to the bottom of the outer circular recessed seat; A plurality of locking members, the locking members comprising a fixed locking disk and a movable locking disk respectively located in the outer circular recess and the inner circular recess, the fixed locking disk being provided with a positioning hole matched with the positioning pin, an outer sleeve perpendicular to the fixed locking disk being fixed at the center, the outer sleeve being located in the corresponding notch; an inner sleeve perpendicular to the movable locking disk being fixed at the center, the movable locking disk being provided with a center hole communicating with the inner sleeve, the inner sleeve being located inside the outer sleeve and the two being threadedly matched; a sealing gasket being provided between the fixed locking disk and the bottom of the outer circular recess, and a sealing gasket being provided between the movable locking disk and the bottom of the inner circular recess; A plurality of plugs, which are installed and fixed on the central holes of some movable locking plates to seal the central holes; A plurality of reinforcement anchor rods, each of which comprises a rod body, a threaded rod extending forward being fixedly connected to the front end of the rod body, a rear rotating sleeve being rotatably fixed on the rod body, the rear rotating sleeve being unable to produce axial movement, a conical head being fixed to the front end of the threaded rod, a front rotating sleeve being sleeved on the threaded rod and matching with the thread thereof, a plurality of groups of folding arms being connected between the rear rotating sleeve and the front rotating sleeve; in an initial state, the folding arms are in an extended state and abut against the four sides of the threaded rod, and when the front rotating sleeve moves backward, the folding arms can eventually be distributed radially around the threaded rod; an external thread section is provided at the rear of the rod body, and the external thread section can be fastened to the inner sleeve by threads.

2. The combined connection structure of concrete subway segments according to claim 1 is characterized in that: The movable locking disk is provided with a screwing mechanism which cooperates with the screwing tool.

3. The combined connection structure of concrete subway segments according to claim 2 is characterized in that: The fixed locking disk and the movable locking disk are both in the shape of a disk, and the screwing mechanism is an eccentric hole opened on the end surface of the movable locking disk, and the number of the eccentric holes is at least two.

4. The combined connection structure of concrete subway segments according to claim 1, characterized in that: The rear end of the rod body is provided with a grouting hole, the front end of the rod body is provided with a discharge hole, and the interior of the rod body is hollow so that the grouting hole is communicated with the discharge hole.

5. The combined connection structure of concrete subway segments according to claim 1 is characterized in that: The rear rotating sleeve and the front rotating sleeve are provided with an equal number of hinged seats, and the folding arm includes two linked connecting rods, the other end of one connecting rod is hingedly fixed to the hinged seat of the rear rotating sleeve, and the other end of the other connecting rod is hingedly fixed to the hinged seat of the front rotating sleeve.

6. The combined connection structure of concrete subway segments according to claim 5, characterized in that: In the two connecting rods, a resistance sheet for increasing the rotation resistance of one of the connecting rods is fixed on the side away from the threaded rod.

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