Shield segment connecting component and shield segment splicing method

Abstract

The invention relates to a shield segment connecting component and a shield segment splicing method, the connecting component comprises C-shaped components and an H-shaped component, and the H-shaped component is embedded into an H-shaped space formed by the two C-shaped components; the H-shaped component comprises a first component and a second component, the first component is provided with a hollow shaft, a connecting main shaft is arranged in the hollow shaft, the connecting main shaft is movably sleeved with a positioning sleeve, one end of the positioning sleeve is provided with a radial flange, and the other end of the positioning sleeve is provided with a spherical column; the second component is internally provided with an annular groove used for containing the hollow shaft and serving as a first cavity and an annular cavity used for containing the radial flange and serving as a second cavity. A conversion piece is rotationally arranged on the first component, a spherical groove is formed in one side of the conversion piece, the conversion piece and the spherical column form a spherical pair, and a force application opening is formed in the conversion piece and exposed out of the surface of the hollow shaft. And the locking mechanism is used for locking and positioning the conversion piece. According to the method, connecting components are adopted, rapid and convenient installation of the shield segments is achieved, and sufficient and controllable pre-tightening force is provided for segment connection after installation is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnels, and in particular relates to a shield segment connecting component and a shield segment splicing method. Background Art

[0002] As the outermost barrier of the tunnel, the shield segment is the main supporting member of the tunnel, bearing the surrounding soil pressure, groundwater pressure and other loads. The number of tunnel segments in a ring varies according to factors such as the diameter and length of the tunnel, generally between 6 and 12 pieces, and the rings are connected in the form of through seams or staggered seams. The connection between the segments includes longitudinal connection along the longitudinal axis of the tunnel and circumferential connection perpendicular to the longitudinal axis.

[0003] Currently, shield segments are mainly connected by bolts. During the segment processing, arc-shaped bolt connection holes are reserved on the segments to match the prefabricated arc-shaped bolts. Shield segments with arc-shaped bolt connection holes are not only difficult to process and manufacture, but also difficult to ensure quality during segment processing. In addition, when bent bolts are used to connect the segments, the connection construction efficiency is low, and the bent bolts are not easy to insert between the segments. The most common treatment method on site is hammering, which can easily cause damage to the segments. Summary of the invention

[0004] The purpose of the present invention is to provide a shield segment connection component and a shield segment splicing method. By adopting the combination of C-shaped parts made on the segments and prefabricated H-shaped parts, the shield segments can be installed quickly and conveniently while ensuring the connection strength. After the installation is completed, sufficient and controllable preload force can be provided for the segment connection.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a shield segment connecting member, comprising two C-shaped members and an H-shaped member for use together, the two C-shaped members are prefabricated on two shield segments to be connected in a manner that the side openings face each other, and the H-shaped member is embedded in the H-shaped space formed by the two C-shaped members; The H-shaped component comprises a first component and a second component, wherein the first component is a T-shaped structure, and the second component is a long strip structure, the first component is provided with a hollow shaft for vertically connecting with the second component, a connecting spindle with an end portion exposed from the hollow shaft is installed inside the hollow shaft, a positioning sleeve is movably sleeved on the connecting spindle, a radial flange is provided at one end of the positioning sleeve, and a spherical column is provided on the cylindrical surface at the other end; a cavity 1 and a cavity 2 are provided inside the second component, the cavity 1 is an annular groove capable of accommodating the hollow shaft, and is open to the surface of the second component, a channel is provided in the area surrounded by the cavity 1, and the channel is connected to the cavity 2, the cavity 2 is an annular cavity for accommodating the radial flange, so as to realize the synchronous translation of the second component along the connecting spindle with the positioning sleeve; The first component is provided with a rotatable conversion part, a spherical groove is provided on one side of the conversion part, the spherical groove and the ball head at the end of the spherical column form a ball pair, and a force application port is provided on the conversion part, and the force application port is exposed from the surface of the hollow shaft; a locking mechanism for locking and positioning the conversion part is also provided in the hollow shaft.

[0006] Its beneficial effects are: the connecting component of the present invention utilizes a prefabricated H-shaped component to connect two C-shaped components prefabricated on the shield segment, thereby realizing fast and convenient installation of the shield segment while ensuring the connection strength; through the internal structure coordination of the H-shaped component, the pre-tightening of adjacent shield segments is realized, and the number of rotations of the conversion piece can be controlled to provide a consistent pre-tightening force for each node connecting the shield segment, reduce the stress concentration phenomenon of the shield segment, and reduce the possibility of structural damage.

[0007] A rectangular limit block is provided at the end of the connecting main shaft, and a cavity three is provided in the second component, and the cavity three is connected to the channel. The cavity three is used to accommodate the limit block, and the limit block is slidably fitted with the inner wall of the cavity three on all sides, and the difference between the depth of the cavity three and the thickness of the limit block is the maximum distance of relative movement of the second component.

[0008] The beneficial effect is that the limit block has two functions. On the one hand, it can ensure that the second component can only move in translation but not rotate. On the other hand, it can limit the translation distance of the second component.

[0009] A fixing plate is arranged in the hollow shaft, and a mounting hole for mounting the conversion member is arranged on the fixing plate.

[0010] The beneficial effect is that an installation position is provided for the installation of the conversion member.

[0011] The locking mechanism includes a toothed groove arranged on the conversion member, an anti-recoil block plate and a pre-tensioning spring arranged on the fixed plate. The anti-recoil block plate is provided with a hook that can engage with the toothed groove and control the one-way rotation of the conversion member. The pre-tensioning spring acts on the anti-recoil block plate so that the hook is tightly attached to the toothed groove.

[0012] The beneficial effects are: the locking mechanism has two functions: one is to fix the position of the conversion part to maintain the stability of the preload; the other is to facilitate the control of the rotation angle of the conversion part so that each node of the shield segment can obtain a consistent preload.

[0013] The fixing plate is provided with an installation cavity on each side of the installation hole, the anti-retraction baffle is rotatably installed in the installation cavity, the hook of the anti-retraction baffle extends from one side of the installation cavity and engages with the toothed groove of the conversion part in the installation hole; the preload spring is arranged between the anti-retraction baffle and the inner wall of the installation cavity.

[0014] The beneficial effect is that the anti-retraction baffles are distributed on both sides of the conversion member, which can make the conversion member more evenly stressed and prevent the conversion member from tilting and getting stuck.

[0015] The inner wall of the installation cavity is provided with a spring hole for accommodating the preload spring, and a portion of the preload spring exposed from the spring hole is in contact with the anti-retraction blocking piece.

[0016] The beneficial effects are: ensuring the fixation of the position of the preload spring, preventing the preload spring from falling off or leaving the original position, and thus ensuring the stability of the relationship between the preload force and the rotation angle of the conversion member.

[0017] The force application opening is a hexagonal hole.

[0018] The beneficial effect is that it is easy to operate with a hexagonal wrench.

[0019] The C-shaped member is provided with threaded holes for connecting with threaded steel bars reserved on the shield segment.

[0020] The beneficial effect is that it is easy to prefabricate and connect the C-shaped component with the shield segment.

[0021] The cross section of the hollow shaft is rectangular.

[0022] The beneficial effect is that the second component can be prevented from rotating.

[0023] The present invention further provides a shield segment connection construction method, which uses the above-mentioned connecting member to connect adjacent shield segments, comprising the following steps: Step 1: Make C-shaped components and H-shaped components according to the cross-sectional size of the shield tunnel and the size of the shield segment; Step 2: Connect the C-shaped member to the threaded steel bars on the segment steel cage and pour concrete together to make the shield segment; Step 3: Assemble the shield segments according to the assembly requirements, insert the H-shaped member into the two C-shaped members of the adjacent shield segments, and then rotate the conversion member to provide pre-tightening force for the two shield segments until the assembly connection of one ring of support structure is completed; Step 4: Use staggered splicing to splice the next ring of shield segments, and use the connecting components to connect the two rings of support structures; repeat this step until the construction of tunnel shield segment splicing is completed.

[0024] The beneficial effects of the present invention are as follows: the prefabricated segment connection component of the present invention has a simple structure, is easy to process, and has good quality of processed segments. The prefabricated H-shaped component is used to connect the segments, and the connection construction efficiency is high. The H-shaped component is also easier to insert between the segments than the traditional bolt connection. A plurality of C-shaped components are directly connected to the internal steel bars of the segments, and have high connection strength. When used in conjunction with the H-shaped component, the connection and the connection component have sufficient strength and rigidity to fully meet the force requirements of the shield tunnel segments. In addition, through the internal structure of the H-shaped component, the pre-tightening of adjacent segments is realized, and the number of rotations of the hexagonal hole can be controlled to provide a consistent pre-tightening force for each node of the segment connection, reduce the stress concentration phenomenon of the segments, and reduce the possibility of structural damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a connection schematic diagram of the shield segment connection component of the present invention; Figure 2 It is an exploded schematic diagram of the shield segment connection component of the present invention; Figure 3 It is a structural diagram of a C-shaped member in the present invention; Figure 4 is a perspective view of an H-shaped member in the present invention; Figure 5 It is a schematic diagram of the decomposition of the H-shaped component in the present invention; Figure 6 It is a structural diagram of the conversion member in the present invention; Figure 7 It is a structural diagram of the positioning sleeve in the present invention; Figure 8 It is a structural diagram of the anti-recoil block member in the present invention; Fig. 9 It is a perspective and cross-sectional view of the fixed column of the present invention; Fig.10 It is a schematic diagram of the principle of the anti-recoil block member of the present invention; Fig.11 It is a structural diagram of the left side member of the H-shaped member of the present invention; Fig.12 It is a structural diagram of the right side member of the H-shaped member of the present invention; Fig.13 This is a structural diagram of the shield segment of unit A of the present invention; Fig.14 This is a structural diagram of the B unit shield segment of the present invention; Fig.15 It is a schematic diagram of assembling the A unit shield segment and the B unit shield segment of the present invention; Fig.16 It is a schematic diagram of assembling two-ring shield segments of the present invention; Markings in the figure: 1. C-type component, 101. threaded hole, 2. H-type component, 3. prefabricated nut, 4. threaded steel bar, 401. threaded head, 5. conversion piece, 501. hexagonal hole, 502. spherical groove, 503. toothed groove, 6. positioning sleeve, 601. spherical column, 602. radial flange, 7. anti-retraction block, 701. hook, 702. pin hole, 8. fixing plate, 801. mounting hole, 802. mounting cavity, 803. pin shaft, 804. preload spring, 9. connecting spindle, 901. limit block, 10. left component, 1001. hollow shaft, 11. right component, 1101. cavity one, 1102. cavity two, 1103. cavity three, 12. A unit shield segment, 13. B unit shield segment. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0028] Embodiment 1: A shield segment connecting component comprises two C-shaped components 1 and one H-shaped component 2, wherein the two C-shaped components 1 are respectively prefabricated on two shield segments to be connected. When the two shield segments are butt-connected, the side openings of the two C-shaped components 1 on the shield segments face each other to form an H-shaped space that can accommodate the H-shaped components 2. The H-shaped component 2 is then embedded in the H-shaped space to realize the connection of the C-shaped components 1 on the two shield segments, thereby realizing the connection of the two shield segments.

[0029] The structure of the C-shaped component 1 is as follows Figure 2 , 3 As shown, a threaded hole 101 is provided on the back of the shield segment. When the shield segment is manufactured, a threaded steel bar 4 with a threaded head 401 is reserved on the internal steel cage, and the prefabricated C-shaped member 1 is connected to the threaded head 401 of the threaded steel bar 4 through the threaded hole 101, and the prefabricated nut 3 is tightened against the C-shaped member 1, so that the connection between the C-shaped member 1 and the internal steel bar of the segment is more firmly.

[0030] like Figure 4 , 5As shown, the H-shaped member 2 includes a left member 10 and a right member 11, wherein the left member 10 is T-shaped and the right member 11 is long strip, or the left member is long strip and the right member is T-shaped. In this embodiment, the T-shaped left member 10 and the long strip right member 11 are used to form the H-shaped member 2. A conversion member 5, a positioning sleeve 6, an anti-retraction member 7, a fixing plate 8 and a connecting spindle 9 are also provided inside the H-shaped member 2.

[0031] like Fig.11 As shown, the left-side member 10 is provided with a hollow shaft 1001 for vertically connecting with the right-side member 11, the cross-section of the hollow shaft 1001 is rectangular, the connecting spindle 9 is fixedly installed inside the hollow shaft 1001, the length of the connecting spindle 9 is greater than the length of the hollow shaft 1001, and a limiting block 901 is provided at the end of the connecting spindle 9, the limiting block 901 is rectangular, and its length and width dimensions are greater than the shaft diameter of the connecting spindle 9.

[0032] The right side member 11 is provided with three cavities, namely, cavity 1 1101, cavity 2 1102 and cavity 3 1103. The cavity 1 1101 is an annular groove capable of accommodating the hollow shaft 1001 and is open on the surface of the right side member 11. During the relative movement of the left side member 10 and the right side member 11, the hollow shaft 1001 is always in the cavity 1 1101. A channel is provided in the area enclosed by the cavity 1 1101 and is open on the surface of the right side member 11. The inner end of the channel is connected with the cavity 2 1102 and the cavity 3 1103 in sequence. The cavity 2 1102 is located outside the cavity 3 1103. The shape of the cavity 3 1103 is adapted to the stop block 901 to accommodate the stop block 901, and the difference between the depth of the cavity 3 1103 and the thickness of the stop block 901 is the maximum distance of relative movement of the right side member 11. The connecting spindle 9 and the positioning sleeve 6 are arranged through the channel.

[0033] like Figure 5 , 6 As shown, the fixed plate 8 is fixed inside the hollow shaft 1001, and the conversion member 5 is installed on the fixed plate 8. The conversion member 5 includes a rotating part and a connecting part. The rotating part is a cylinder, which is rotatably installed on the fixed plate 8, and the rotating part is provided with a hexagonal hole 501 for easy rotation. The hexagonal hole 501 is exposed from the surface opening of the hollow shaft 1001, so that the worker can use a hexagonal wrench to rotate the conversion member 5; the connecting part is arranged on one side of the rotating part and is perpendicular to the rotation axis of the rotating part. A spherical groove 502 is provided on the connecting part for connecting with the positioning sleeve 6.

[0034] like Figure 7As shown, the positioning sleeve 6 is a hollow columnar structure, which is sleeved on the connecting main shaft 9 and can move and rotate axially on the connecting main shaft 9. A radial flange 602 is provided at one end of the positioning sleeve 6, and a spherical column 601 is provided at the other end. The spherical column 601 is located on the cylindrical surface of the positioning sleeve 6 and is perpendicular to the axial direction of the positioning sleeve 6. The end of the spherical column 601 is a ball head. The radial flange 602 is stuck in the cavity 2 1102. The cavity 2 1102 is an annular cavity, and its depth is the same as the axial thickness of the radial flange 602. The diameter of the cavity 2 1102 is the same as the outer diameter of the radial flange 602. Therefore, the annular cavity 2 1102 can limit the axial movement of the positioning sleeve 6, so that it can only rotate relative to the cavity 2 1102. When the positioning sleeve 6 moves along the connecting main shaft 9, the radial flange 602 and the cavity 2 1102 cooperate to drive the right member 11 to move as a whole. The ball head on the spherical column 601 and the spherical groove 502 on the conversion member 5 form a movable ball pair. After the conversion member 5 rotates, the positioning sleeve 6 is driven by the ball pair to translate along the connecting main axis 9 while rotating, thereby driving the right side component 11 to move toward the middle, reducing the distance between the left and right components. When the H-shaped component 2 is installed on two adjacent shield segments, it can provide a certain preload force for the connection of the shield segments.

[0035] It should be noted that the positioning sleeve 6, the connecting spindle 9 and the right-side component 11 are prefabricated together, the radial flange 602 of the positioning sleeve 6 is stuck in the cavity two 1102, the limit block 901 at the end of the connecting spindle 9 is located in the cavity three 1103, and can move axially relative to each other in the cavity three 1103 under the action of external force.

[0036] Further, such as Fig. 9 , 10 As shown, a locking mechanism is further provided between the conversion member 5 and the fixed plate 8 to lock the position of the conversion member 5. The locking mechanism comprises a toothed groove 503 provided on the rotating part of the conversion member 5, an anti-retraction block sheet 7 provided on the fixed plate 8, and a preload spring 804.

[0037] The toothed grooves 503 are distributed on the cylindrical surface of the rotating part of the conversion member 5. The fixing plate 8 is provided with a mounting hole 801 for mounting the conversion member 5. The mounting holes 801 are symmetrically provided with mounting cavities 802 on both sides thereof, and the mounting cavities 802 are communicated with the mounting holes 801.

[0038] like Figure 8 As shown, the pin hole 702 of the anti-retraction baffle 7 is installed on the pin shaft 803 in the installation cavity 802, and a hook 701 capable of engaging with the toothed groove 503 is provided on the side of the anti-retraction baffle 7 away from the pin hole 702 and facing the conversion member 5.

[0039] like Fig.10As shown, the pre-tightening spring 804 is arranged on the side of the anti-retraction baffle plate 7 away from the hook 701, and the two ends of the pre-tightening spring 804 are respectively supported on the anti-retraction baffle plate 7 and the inner wall of the installation cavity 802. Under the elastic force of the pre-tightening spring 804, the hook 701 of the anti-retraction baffle plate 7 is always close to the toothed groove 503 of the conversion part 5, and the hook 701 of the anti-retraction baffle plate 7 only allows the conversion part 5 to rotate clockwise. Every time the conversion part 5 is rotated, the hook 701 of the anti-retraction baffle plate 7 can be stuck in the toothed groove 503 to prevent the conversion part 5 from reversing and maintain the pre-tightening state.

[0040] The cooperation between the hook 701 of the anti-retraction plate 7 and the toothed groove 503 on the conversion member 5 can refer to the ratchet and pawl mechanism to achieve the control of the unidirectional rotation of the conversion member.

[0041] Preferably, a spring hole for accommodating the preload spring 804 is opened on the inner wall of the installation cavity 802 , and a portion of the preload spring 804 exposed from the spring hole presses against the anti-retraction baffle 7 .

[0042] It is understandable that in other embodiments, the preload spring 804 and the hook 701 can be arranged on the same side, so that the tension of the preload spring 804 can also keep the anti-retraction plate 7 always close to the toothed groove 503 of the conversion member 5, thereby preventing the conversion member 5 from reversing.

[0043] The pre-tightening operation process of the H-shaped member described in the present invention is: embed the H-shaped member 2 into the C-shaped member 1 with two side openings facing each other, then use a hexagonal wrench to insert the hexagonal hole 501 of the conversion member, rotate clockwise, and the conversion member 5 rotates, driving the positioning sleeve 6 to move along the connecting main shaft 9 while rotating, thereby driving the right side member 11 in the H-shaped member 2 to move, thereby realizing the pre-tightening of two adjacent pipe segments.

[0044] like Figure 13-16 As shown, the shield segments of this embodiment are divided into A-unit shield segments 12 and B-unit shield segments 13, and each ring support structure includes one A-unit shield segment 12 and five B-unit shield segments 13. The center angle of the A-unit shield segment 12 is 22.5°, and two C-shaped components 1 are arranged on each side of the circumferential direction, and one C-shaped component 1 is arranged on each side of the axial direction. The center angle of the B-unit shield segment 13 is 67.5°, and two C-shaped components 1 are arranged on each side of the circumferential direction, and three C-shaped components 1 are arranged on each side of the axial direction. The angle between two adjacent C-shaped components 1 at the same end of the shield segment in the axial direction is 22.5°. The C-shaped components 1 of adjacent shield segments in each ring are aligned, and are connected and pre-tightened by H-shaped components 2. After the shield segments are assembled into a ring, the angle between adjacent C-shaped components in the circumferential direction is 22.5 degrees. Adjacent rings can be rotated 22.5° for staggered assembly and connected and pre-tightened by H-shaped components 2.

[0045] In other embodiments, the number of shield segments can be adjusted according to actual conditions, the central angle of each shield segment is also adjusted accordingly, and the position and number of C-shaped components 1 on the segments are also adjusted accordingly to meet the connection requirements between the segments.

[0046] Using the connection structure of the present invention, the assembly process of the shield segments is as follows: after placing the shield segments to be spliced, insert the prefabricated H-shaped member 2 into the C-shaped members 1 aligned on the two shield segments. The overall size of the H-shaped member 2 is slightly larger than the distance between the C-shaped members 1 of the adjacent segments. After insertion, the displacement movement of the adjacent segments can be limited, and the shield segments can be connected. After the H-shaped member 2 is installed, the hexagonal hole 51 set on it is used to rotate the hexagonal hole 51 clockwise from the outside with an inner hexagonal wrench, so that the conversion member 5 rotates clockwise, driving the positioning sleeve 6 to rotate along the connecting main axis 9 and move to the left, thereby driving the right member 11 to move to the middle, reducing the distance between the left and right members, and at the same time realizing the connection of the adjacent segments, and providing a certain preload force for the segment connection. The anti-rebate block 7 arranged inside the mounting plate 8 is always in close contact with the toothed groove 503 of the conversion member 5 under the action of the preload spring 804. The anti-rebate block 7 only allows the conversion member 5 to rotate clockwise. Each time the conversion member 5 is rotated, the anti-rebate block 7 can fix the conversion member 5 in a fixed position.

[0047] Embodiment 2: A shield segment splicing method, which is specifically divided into the following steps: 1. Production of C-shaped components and H-shaped components. The dimensions of C-shaped components 1 and H-shaped components 2 can be designed according to the cross-sectional size of the shield tunnel and the size of the shield segment.

[0048] 2. Fabrication of prefabricated shield segments. Connect the C-shaped component 1 with the threaded steel bars 4 on the segment reinforcement cage, and pour concrete together (pay attention to protecting the C-shaped component 1 during pouring to prevent concrete from entering the component), forming the A-unit shield segment 12 and the B-unit shield segment 13.

[0049] 3. Shield segment assembly. Assemble the shield segments as required, insert the H-shaped member 2 into the C-shaped member 1 of the adjacent segment, rotate the conversion member 5 clockwise through the hexagonal hole 51, provide sufficient pre-tightening force for the adjacent segments as required, and complete the assembly of a ring of support structure.

[0050] 4. The next ring is staggered. The segments can be rotated by 22.5° so that the shield segments can be assembled in staggered positions. Each ring of support structure is assembled according to step 3, and the rings are also connected by H-shaped components, such as Fig.16 Repeat this step to complete the construction of the shield tunnel support structure.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Those skilled in the art should understand that the specific implementation modes of the present invention may be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A shield segment connection member, characterized in that: It includes two C-shaped components and one H-shaped component used in conjunction with each other. The two C-shaped components are prefabricated on the two shield segments to be connected with their side openings facing each other. The H-shaped component is embedded in the H-shaped space formed by the two C-shaped components. The H-shaped component includes a first component and a second component, wherein the first component is a T-shaped structure and the second component is an elongated structure, the first component is provided with a hollow shaft for vertically connecting to the second component, a connecting spindle with an end portion exposed from the hollow shaft is installed inside the hollow shaft, a positioning sleeve is movably sleeved on the connecting spindle, one end of the positioning sleeve is provided with a radial flange, and the cylindrical surface of the other end is provided with a spherical column; a cavity one and a cavity two are provided in the second component, the cavity one is an annular groove capable of accommodating the hollow shaft and is open to the surface of the second component, a channel opening to the surface of the second component is provided in the area enclosed by the cavity one, the channel is connected to the cavity two, the cavity two is an annular cavity for accommodating the radial flange, so as to realize the synchronous translation of the second component along the connecting spindle with the positioning sleeve; A rotatable conversion part is provided on the first component, and a spherical groove is provided on one side of the conversion part. The spherical groove and the ball head at the end of the spherical column form a ball pair. A force application port is provided on the conversion part, and the force application port is exposed from the surface of the hollow shaft; a locking mechanism for locking the conversion part in position is also provided in the hollow shaft.

2. The shield segment connection member according to claim 1, characterized in that: A rectangular limit block is provided at the end of the connecting main shaft, and a cavity three is provided in the second component, which is connected to the channel. The cavity three is used to accommodate the limit block, and the limit block is slidably fitted with the inner wall of the cavity three on all sides. The difference between the depth of the cavity three and the thickness of the limit block is the maximum distance of relative movement of the second component.

3. The shield segment connection member according to claim 1 or 2, characterized in that: A fixing plate is provided in the hollow shaft, and a mounting hole for mounting the conversion member is provided on the fixing plate.

4. The shield segment connection member according to claim 3, characterized in that: The locking mechanism includes a toothed groove arranged on the conversion part, an anti-recoil block plate and a pre-tightening spring arranged on the fixed plate. The anti-recoil block plate is provided with a hook that can engage with the toothed groove and control the one-way rotation of the conversion part. The pre-tightening spring acts on the anti-recoil block plate so that the hook is tightly attached to the toothed groove.

5. The shield segment connection member according to claim 4, characterized in that: The fixing plate is provided with a mounting cavity on each side of the mounting hole, and the anti-recoil baffle is rotatably installed in the mounting cavity. The hook of the anti-recoil baffle extends from one side of the mounting cavity and engages with the toothed groove of the conversion part in the mounting hole; the pre-tightening spring is provided between the anti-recoil baffle and the inner wall of the mounting cavity.

6. The shield segment connection member according to claim 4, characterized in that: The inner wall of the installation cavity is provided with a spring hole for accommodating the pre-tightening spring, and a portion of the pre-tightening spring exposed from the spring hole contacts the anti-retraction blocking piece.

7. The shield segment connection member according to claim 1, characterized in that: The force application opening is a hexagonal hole.

8. The shield segment connection member according to claim 1, characterized in that: The C-shaped member is provided with threaded holes for connecting with threaded steel bars reserved on the shield segments.

9. The shield segment connection member according to claim 1, characterized in that: The cross section of the hollow shaft is rectangular.

10. A shield segment splicing method, characterized in that: Connecting adjacent shield segments using the connecting member according to any one of claims 1 to 9 comprises the following steps: Step 1: Make C-shaped and H-shaped components according to the cross-sectional size of the shield tunnel and the size of the shield segments; Step 2: Connect the C-shaped member to the threaded steel bars on the segment reinforcement cage and pour concrete together to make the shield segment; Step 3: Assemble the shield segments according to the assembly requirements, insert the H-shaped member into the two C-shaped members of the adjacent shield segments, and then rotate the conversion piece to provide pre-tightening force for the two shield segments until the assembly and connection of one ring of support structure is completed; Step 4: Use staggered splicing to splice the next ring of shield segments, and connect the two rings of support structures through the connecting components; repeat this step until the construction of tunnel shield segment splicing is completed.

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