Pipe piece circular seam quick connector based on direct insertion type bolt mechanical engagement and construction method

Abstract

The invention relates to a pipe piece circular seam quick connector based on direct insertion type bolt mechanical engagement and a construction method. A special-shaped mortise is located in the splicing end face of the circular seam position of a shield pipe piece, and a mortise side face reserved groove is formed in the inner wall of the hole; a rotary clamping point is arranged on the outer wall of the mortise joint nut, and the rotary clamping point is clamped into a groove reserved in the side face of the mortise after the mortise joint nut is inserted into the special-shaped mortise; connecting screws are inserted into the positioning tenons, and the two ends of each connecting screw are inserted into mortise joint nuts on the two sides of the pipe piece circular seam respectively; and the positioning tenon at the circular seam position of the segment and the two mortise joint nuts are connected with each other through the same connecting screw rod, so that the two adjacent shield segments are tightly spliced. On the basis of a direct insertion type rapid connection and positioning connection integrated segment seam splicing concept, a bolt direct insertion type connection mode is adopted, and the mortise joint nuts on the two sides of the circular seam are connected through the positioning tenon and the straight screw rod, so that rapid connection is achieved, hand holes for conventional seam bolt connection are eliminated, and the lining structural rigidity of the seam position is improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering construction, and in particular to a pipe segment annular seam quick joint based on mechanical engagement of straight-insertion bolts and a construction method. Background Art

[0002] With the increasing depth of underground projects and the increasing demand for the utilization of deep underground space, the construction environment of prefabricated underground projects has become more and more complex, the groundwater pressure has become greater, and the requirements for rapid connection and waterproofing of structural joints have become higher and higher. The construction quality of underground prefabricated structures is determined to a certain extent by the quality of joint assembly. The leakage of underground structures is mainly caused by the opening or leakage of joints, and the deformation of underground structures is mainly caused by the misalignment of the structures on both sides of the joints. The damage of underground structures generally always starts from the joints.

[0003] For prefabricated structures, the rapid and efficient connection of the structures on both sides of the joint is the key to directly determining the on-site construction speed, installation quality and overall performance of the formed structure. Therefore, various types of quick connectors have emerged. However, when the thickness of the lining structure is relatively thin (such as 300-350mm) and the conventional bolt connection process is not changed, how to increase the connection efficiency and waterproof quality of the circumferential seam of the shield tunnel segment has become a problem of general concern in the industry.

[0004] For thin segment lining (350mm and below), the commonly used segment annular seam connection process is mainly bent bolts and hand holes. For thicker segment lining, positioning tenons can be added on this basis. However, positioning tenons only play a positioning role in the segment lining assembly stage, and fail to strengthen the joint connection stiffness, which often leads to insufficient segment lining stiffness at the joint, late deformation and joint opening, and leakage that is difficult to effectively control. How to combine positioning tenons with conventional bolt connection methods, avoid using bent bolts that are not conducive to the stability of segment linings, and achieve fast and efficient assembly of segment annular seams on site is a major technical problem that the industry generally pays attention to. Summary of the invention

[0005] The purpose of the present invention is to provide a segment annular seam quick joint based on mechanical engagement of straight-insertion bolts and a construction method, so as to achieve rapid and efficient connection of underground prefabricated structure seams and prevent seam opening, leakage and long-term deformation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pipe segment annular seam quick joint based on mechanical engagement of straight-insertion bolts, the pipe segment annular seam quick joint comprising a special-shaped tenon hole, a positioning tenon, a tenon hole joint nut and a connecting screw;

[0008] The special-shaped tenon hole is located at the splicing end surface of the annular seam position of the shield segment, and the inner wall of the special-shaped tenon hole is provided with a reserved groove on the side of the tenon hole;

[0009] The outer wall of the mortise joint nut is provided with a rotating clamping point, the mortise joint nut is inserted into the special-shaped mortise, and the rotating clamping point is clamped into the reserved groove on the side of the mortise;

[0010] A connecting screw is inserted into the positioning tenon, and two ends of the connecting screw are respectively inserted into the tenon hole joint nuts on both sides of the segment annular seam;

[0011] The positioning tenon at the segment annular seam position and the two tenon hole joint nuts are connected to each other through the same connecting screw, so that two adjacent shield segments are tightly spliced ​​to each other.

[0012] Further, the mortise and tenon joint nut is a hexagonal column;

[0013] Correspondingly, the segment of the special-shaped tenon hole corresponding to the tenon hole joint nut is a hexagonal hole.

[0014] Furthermore, the outer wall of the mortise and tenon joint nut is provided with a reserved groove on the side of the nut, and the rotary clamping point is located in the reserved groove on the side of the nut.

[0015] Furthermore, the rotary clamping point includes a second compression spring, a rotating shaft and a rotatable steel plate, one end of the rotatable steel plate is connected to the front end of the reserved groove on the side of the nut through the rotating shaft, and the other end of the rotatable steel plate is connected to the rear end of the reserved groove on the side of the nut through the second compression spring.

[0016] Furthermore, the reserved groove on the side of the tenon hole gradually expands from front to back, and a clamping point groove is arranged on the inclined surface of the rear end, and a telescopic clamping point is arranged in the clamping point groove.

[0017] Further, the telescopic clamping point comprises a first compression spring and a slider with an ear, one end of the slider with an ear is connected to the first compression spring, and the other end is provided with an ear protrusion;

[0018] When the rotating clamping point is clamped into the reserved groove on the side of the tenon hole, the ear protrusion is limited on the outer side of the rotatable steel plate.

[0019] Furthermore, a non-through nut middle reserved hole is provided at the rear end of the mortise and tenon joint nut for inserting the connecting screw, and the inner wall of the nut middle reserved hole is provided with nut internal steel teeth.

[0020] Furthermore, the cross section of the positioning tenon is circular, with equal cross-section parts at both ends and a variable cross-section part in the middle, and the cross-sectional area of ​​the variable cross-section part decreases from the middle to both sides;

[0021] Correspondingly, the segment of the special-shaped tenon hole corresponding to the equal-section part is a circular hole of equal section, and the segment of the special-shaped tenon hole corresponding to the variable-section part is a circular hole with increasing cross-sectional area from front to back.

[0022] Further, the positioning tenon includes a tenon core, a tenon core and a tenon wing, and the tenon core, the tenon core and the tenon wing are symmetrically distributed about the central axis, and the variable cross-section portion is the tenon wing;

[0023] The tenon core and the tenon nucleus are both axially symmetrical cylindrical structures with a through hole arranged on the central axis. The tenon core is sleeved outside the tenon nucleus, and the tenon wings are sleeved outside the tenon core.

[0024] On the other hand, a method for constructing a segment annular seam quick joint based on mechanical engagement of straight-insertion bolts is provided, the method comprising:

[0025] Insert the mortise joint nut into the special-shaped mortise hole at the splicing end face of the shield segment on one side of the segment annular seam;

[0026] When the rotating clamping point on the outer wall of the nut of the tenon joint enters the special-shaped tenon hole, under the action of the rotating shaft, the rotatable steel plate compresses the second compression spring inwardly, and the rotatable steel plate rotates inwardly and enters the special-shaped tenon hole together;

[0027] Continue to push the mortise joint nut, and when the rotary clamping point moves to the reserved groove on the side of the mortise in the special-shaped mortise, the second compression spring is reset, and under the action of the rotating shaft, the steel plate can be rotated outward;

[0028] At the same time, the end of the rotatable steel plate contacts the slider with ears of the telescopic clamping point, the first compression spring is compressed, the slider with ears moves into the groove of the clamping point, the rotatable steel plate continues to rotate to the outside of the slider with ears, the first compression spring is reset, the slider with ears is clamped on the inside of the rotatable steel plate, the rotatable steel plate is clamped into the reserved groove on the side of the tenon hole, and the tenon hole joint nut is fixed in the special-shaped tenon hole;

[0029] Insert one end of the connecting screw into the positioning tenon, and then insert it into the reserved hole in the middle of the nut of the tenon joint nut;

[0030] Insert another mortise joint nut into the special-shaped mortise at the splicing end face of another shield segment, then insert the other end of the connecting screw, and push the other shield segment to splice the two shield segments together.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention provides a segment annular seam quick joint and a construction method based on mechanical engagement of straight-insert bolts. A bolt straight-insert connection method is adopted to replace a traditional bent bolt connection method. The mortise and tenon joint nuts in the shield segments on both sides of the annular seam are connected by positioning tenons and connecting screws to achieve a straight-insert quick connection, eliminating hand holes for conventional seam bolt connections, improving the segment lining stiffness, reducing the risk of segment lining seam leakage, improving the overall assembly quality of the shield tunnel, and enhancing the long-term durability of the shield tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0034] Figure 1 Schematic diagram of the segment annular joint of the shield segments.

[0035] Figure 2 This is a large-scale drawing of the pipe segment joint quick joint of the present invention.

[0036] Figure 3 This is the general drawing of the positioning tenon.

[0037] Figure 4 Large-scale drawing of the special-shaped mortise holes reserved for the end faces of the segment annular seams.

[0038] Figure 5 for Figure 2 AA cross-section diagram in.

[0039] Figure 6 It is a schematic diagram of the mortise and tenon joint nut entering the special-shaped mortise and tenon in the method of the present invention.

[0040] Figure 7 It is a schematic diagram of the nut of the tenon joint near the telescopic clamping point in the method of the present invention.

[0041] Figure 8 It is a schematic diagram of the second compression spring pushing the rotatable steel plate outward in the method of the present invention.

[0042] Fig. 9 It is a schematic diagram of the rotatable steel plate being clamped into the slider with ears in the method of the present invention.

[0043] The symbols in the figure are:

[0044] 1- shield segment;

[0045] 2-segment annular seam;

[0046] 3-special-shaped tenon hole, 31-tenon hole profile, 32-telescopic clamping point, 33-first compression spring, 34-clamping point groove, 35-sliding block with ear, 36-tenon hole profile enlargement position, 37-reserved groove on the side of the tenon hole;

[0047] 4-positioning tenon, 41-tenon core, 42-tenon core, 43-tenon wing;

[0048] 5-tenon joint nut, 51-rotational clamping point, 52-reserved groove on the side of the nut, 53-second compression spring, 54-rotation shaft, 55-rotatable steel plate, 56-inner steel teeth of the nut, 57-reserved hole in the middle of the nut;

[0049] 6-Connecting screw. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0051] In the description of the present invention, it is necessary to understand that the terms "center", "front", "back", "inside", "outside", etc. 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Of course, such objects can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0054] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and it should not be understood as a limitation on the order of steps.

[0055] In a specific implementation, Figure 6The right side of the definition is the front end, and Figure 6 The left side of the definition is the back end. Figure 1 The direction from bottom to top is defined as the longitudinal direction of the underground structure (shield excavation direction), and the direction perpendicular to the longitudinal direction is defined as the transverse direction of the underground structure (horizontal direction, circumferential direction of the segment joints). Figure 2 The direction of the middle bolt 6 is the longitudinal direction of the underground structure.

[0056] like Figure 1 The lining of the underground prefabricated structure is composed of shield segments 1 assembled to form a segment annular seam 2. Due to the rapid construction and safety and quality requirements of the underground prefabricated structure, the structures on both sides of the segment annular seam 2 must be quickly and efficiently connected through the tenon holes on the end faces of the shield segments 1. Therefore, the present invention provides a segment annular seam quick connector based on mechanical engagement of straight-insertion bolts, which can realize the rapid connection of the annular seams of the underground prefabricated structure and improve the overall longitudinal stiffness and long-term stability of the underground prefabricated structure.

[0057] like Figure 2 The segment annular seam quick joint comprises a special-shaped tenon hole 3, a positioning tenon 4, a tenon hole joint nut 5 and a connecting screw 6.

[0058] like Figure 4 In the longitudinal direction of the shield tunnel, every other segment ring width distance has a segment ring seam 2. A ring segment is composed of several shield segments 1. A shield segment 1 is provided with 1-3 special-shaped tenon holes 3 and corresponding quick connectors at the ring seam. The special-shaped tenon holes 3 are located at the splicing end face of the ring seam position of the shield segment 1, symmetrically arranged on both sides of the segment ring seam 2, and arranged at equal intervals in the tunnel circumferential direction, and can generally be considered to be evenly distributed at about 30°. The special-shaped tenon holes 3 have an irregular hole shape. Specifically, the tenon joint nut 5 is a hexagonal column. Accordingly, the segment of the special-shaped tenon hole 3 corresponding to the tenon joint nut 5 is a hexagonal hole. In addition, the cross section of the positioning tenon 4 is circular, with equal cross-section parts at both ends and a variable cross-section part in the middle. The cross-sectional area of ​​the variable cross-section part decreases from the middle to both sides, with the largest in the middle and gradually decreasing toward the two ends. The positioning tenon 4 as a whole presents a cylindrical structural feature of being large in the middle and small at both ends. Correspondingly, the special-shaped tenon hole 3 accommodates half of the positioning tenon 4, and the segments corresponding to the equal cross-section part are equal cross-section circular holes, and the segments corresponding to the variable cross-section part of the special-shaped tenon hole 3 are circular holes with increasing cross-sectional areas from front to back. The inner wall of the special-shaped tenon hole 3 is also provided with a reserved groove 37 on the side of the tenon hole. The shape of the tenon hole profile 31 is consistent with the outer wall of the positioning tenon 4 and the tenon hole joint nut 5, and a reserved condition for the insertion of the two is provided.

[0059] The outer wall of the mortise joint nut 5 is provided with a nut side reserved groove 52, and a rotatable clamping point 51 is provided in the nut side reserved groove 52. When the mortise joint nut 5 is inserted into the special-shaped mortise 3, the rotatable clamping point 51 is clamped into the mortise side reserved groove 37. Specifically, the rotatable clamping point 51 includes a second compression spring 53, a rotating shaft 54 ​​and a rotatable steel plate 55, one end of the rotatable steel plate 55 is connected to the front end of the nut side reserved groove 52 through the rotating shaft 54, and the other end of the rotatable steel plate 55 is connected to the rear end of the nut side reserved groove 52 through the second compression spring 53. The mortise side reserved groove 37 gradually expands from front to back, and the rear end is the mortise contour expansion position 36, and a clamping point groove 34 is provided on the inclined surface of the mortise contour expansion position 36, and a telescopic clamping point 32 is provided in the clamping point groove 34. The telescopic clamping point 32 includes a first compression spring 33 and a slider with an ear 35, one end of the slider with an ear is connected to the first compression spring 33, and the other end is provided with an ear protrusion, and when the rotatable clamping point 51 is clamped into the reserved groove 37 on the side of the tenon hole, the ear protrusion is limited to the outside of the rotatable steel plate 55. The free rotation range of the rotatable steel plate 55 is much larger than the distance between the slider with an ear 35 and the expanded position 36 of the tenon hole contour.

[0060] The positioning tenon 4 is an integral cylindrical structure, wherein the middle raised portion corresponds to the center of the segment annular seam 2, and the two ends are respectively inserted into the special-shaped tenon holes 3 on both sides of the segment annular seam 2. The positioning tenon 4 includes a tenon core 41, a tenon core 42, and a tenon wing 43, which are all symmetrically distributed about the central axis, wherein the variable cross-section portion is the tenon wing 43. The tenon core 42 and the tenon core 41 are both axially symmetrical cylindrical structures with a through hole set on the central axis, the tenon core 42 is sleeved outside the tenon core 41, and the tenon wing 43 is sleeved outside the tenon core 42.

[0061] The rear end of the tenon joint nut 5 is provided with a non-through nut middle reserved hole 57 for inserting the connecting screw 6, and the distance between the bottom of the nut middle reserved hole 57 and the bottom of the tenon joint nut 5 is not less than 10-15 mm. The inner wall of the hole of the nut middle reserved hole 57 is provided with nut internal steel teeth 56, and the spacing of the nut internal steel teeth 56 matches the pitch of the connecting screw 6. The nut internal steel teeth 56 are inclined toward the rear end of the tenon joint nut 5, and the inclination angle can be 30° to 45°. The bite action between the steel teeth 56 and the thread of the connecting screw 6 can ensure that the connecting screw 6 can only move in a single direction toward the front end of the tenon joint nut 5.

[0062] Insert one end of the connecting screw 6 into the positioning tenon 4, and then insert it into the reserved hole 57 in the middle of the nut of the tenon joint nut 5; insert the other tenon joint nut 5 into the special-shaped tenon hole 3 at the splicing end face of the shield segment 1 on the other side of the segment annular seam 2, and with the assistance of the segment assembly machine, use the positioning effect of the positioning tenon 4 to insert the connecting screw 6 into the tenon joint nut 5 at the splicing end face of the shield segment 1 on the other side of the segment annular seam 2, and then under the action of the shield machine jack, slowly push the shield segment 1 on the other side of the segment annular seam 2 until the segment annular seam 2 is completely closed, thereby splicing the shield segments 1 on both sides of the segment annular seam 2 together.

[0063] In the structure of the present invention, the rotation ability of the rotary clamping point 51 is mainly determined by the second compression spring 53, and the sliding height of the eared slider 35 corresponding to the telescopic clamping point 32 is mainly determined by the first compression spring 33. The compression and extension range of the second compression spring 53 is considered to be twice the compression and extension range of the first compression spring 33. When the rotatable steel plate 55 of the rotary clamping point 51 rotates to the eared slider 35, the elastic force of the second compression spring 53 can ensure that the eared slider 35 is smoothly pushed back to the slider groove 34.

[0064] The rotatable steel plate 55 is mechanically fixed to the mortise and tenon joint nut 5 by the rotating shaft 54 ​​, and the rotatable steel plate 55 can rotate freely along the rotating shaft 54 ​​.

[0065] The rotatable steel plate 55 at the rotating clamping point 51 can slide freely in the reserved groove 52 on the side of the nut and the reserved groove 37 on the side of the tenon hole during the extension and compression process of the second compression spring 53. The nut contour and the segment lining contour involved in the corresponding sliding path must be round and the size must also match.

[0066] The total length of the connecting screw 6 is smaller than the sum of the length of the positioning tenon 4 and twice the depth of the reserved hole in the middle of the nut. The specific value can generally be considered to be around 20 to 30 mm.

[0067] The material selection requirements of the present invention are:

[0068] 1. The segment lining is C50 or above waterproof reinforced concrete.

[0069] 2. The slider with ears 35, the mortise and tenon joint nut 5, the steel teeth 56 inside the nut, the rotatable steel plate 55, the second compression spring 53, the first compression spring 33, the rotating shaft 54 ​​and the connecting screw 6 can all be made of Q235 or Q345 steel.

[0070] 3. The fins 43, the mortise core 42 and the core 41 of the positioning tenon 4 are all made of composite materials. The rigidity of the core 41, the mortise core 42 and the fins 43 decreases from the inside to the outside.

[0071] Before the segment assembly construction, the segment annular quick joint can be prefabricated in the factory or on site. According to the construction process requirements, the threaded connection screw 6, the regular hexagonal mortise joint nut 5, the rotatable steel plate 55, the slider with ear 35, etc. are made in advance. The specific steps are:

[0072] S1: According to the diameter and length of the connecting screw 6, the inner diameter and depth of the reserved hole 57 in the middle of the nut of the tenon joint nut 5, the tooth height and the unidirectional inclination angle of the steel teeth 56 inside the nut are simultaneously determined (which can be considered to be about 30°), ensuring that the connecting screw 6 cannot retreat (i.e., move in one direction) after being inserted into the reserved hole 57 in the middle of the nut, and the thread of the connecting screw 6 will be effectively engaged by the unidirectionally inclined steel teeth 56;

[0073] S2: Based on the size of conventional hexagonal nuts, the outline and size of the reserved groove 52 on the side of the nut are determined according to the structural requirements of the rotating clamping point 51, and no less than two second compression springs 53 are arranged in the reserved groove 52 on the side of the nut, and the rotating shaft 54 ​​is used to effectively fix the rotatable steel plate 55 and the mortise joint nut 5;

[0074] S3: According to the connection requirements of the segment annular seam 2 and the overall assembly process requirements of the underground structure, the length and height of the mortise and tenon joint nut 5 and the external contour characteristics are determined, and the size design and factory prefabrication of the mortise and tenon joint nut 5 are completed;

[0075] S4: According to the requirements for the assembly and positioning of underground structures, the overall size of the positioning tenon 4 is clearly defined, and the tenon core 41, the tenon core 42 and the tenon wing 43 are made of high-performance composite materials in sequence. The tenon core 41 is a hollow cylinder, and its length is slightly smaller than the tenon core 42. Its inner diameter matches the size of the connecting screw 6, and its wall thickness is about 10mm; the tenon core 42 has the largest height, and its inner diameter matches the outer diameter of the tenon core 41; the inner diameter of the tenon wing 43 matches the outer diameter of the tenon core 42, but its height is the smallest, and it has a three-dimensional conical structural feature that is large in the middle and small at both ends. First, put the tenon core 42 on the tenon core 41, and then put the tenon wing 43 on the outside of the tenon core 42, ensuring that the cross-sectional centers of the tenon wing 43, the tenon core 42 and the tenon core 41 are located on the same horizontal plane.

[0076] Before construction, according to the overall design plan and assembly process requirements of the underground prefabricated structure, the space for the tenon holes is reserved in the prefabrication stage of the segment lining, and the middle convex structure is set considering the outline requirements of the tenon holes (the grooves on the side of the tenon holes and the need for the telescopic clamping points are reserved), and special-shaped tenon holes 3 are reserved on the segments. The specific steps are:

[0077] S1: Determine the mortise profile 31 according to the specific requirements of the reserved groove 37 on the side of the mortise, the enlarged position 36 of the mortise profile, the slider with ear 35, and the spatial dimensions of the mortise joint nut 5 and the positioning tenon 4;

[0078] S2: According to the construction process requirements of the underground prefabricated structure and based on the requirements of the tenon hole profile 31, the shield segment 1 is manufactured as required, and installation space for the special-shaped tenon hole 3 is reserved;

[0079] S3: After the shield segment 1 is transported to the construction site, while the waterproof material is glued to the end of the segment, the first compression spring 33 and the slider with ear 35 are placed into the slider groove 34 as required. Measures must be taken to limit the slider with ear 35 to prevent it from loosening and falling during the transportation and assembly of the segment.

[0080] According to the progress of the on-site project, after the shield tunneling completes the distance of one ring of segments, the on-site pipe lining assembly work is carried out, such as Figure 6-9 The above-mentioned method for constructing a segment annular seam quick joint based on mechanical engagement of straight-insertion bolts specifically comprises the following steps:

[0081] S1: inserting the mortise joint nut 5 into the special-shaped mortise hole 3 at the joint end face of the assembled shield segment 1;

[0082] S2: When the rotating clamping point 51 on the outer wall of the tenon joint nut 5 enters the special-shaped tenon hole 3, under the action of the rotating shaft 54, the rotatable steel plate 55 compresses the second compression spring 53 inwardly, and the rotatable steel plate 55 rotates inwardly and enters the special-shaped tenon hole 3 together;

[0083] S3: Continue to push the tenon joint nut 5, when the rotary clamping point 51 moves to the reserved groove 37 on the side of the tenon in the special-shaped tenon 3, the second compression spring 53 is reset, and under the action of the rotating shaft 54, the rotatable steel plate 55 rotates outward;

[0084] S4: At the same time, the end of the rotatable steel plate 55 contacts the slider with ears 35 of the telescopic clamping point 32, the first compression spring 33 is compressed, the slider with ears 35 moves into the clamping point groove 34, the rotatable steel plate 55 continues to rotate to the outside of the slider with ears 35, the first compression spring 33 is reset, the slider with ears 35 is clamped on the inside of the rotatable steel plate 55, the rotatable steel plate 55 is clamped into the reserved groove 37 on the side of the tenon hole, and the tenon hole joint nut 5 is fixed in the special-shaped tenon hole 3;

[0085] S5: insert one end of the connecting screw 6 into the positioning tenon 4, and then insert it into the reserved hole 57 in the middle of the nut of the tenon joint nut 5; based on the positioning and guiding function of the positioning tenon 4, with the assistance of the segment assembly machine, insert the connecting screw 6 into the tenon joint nut 5 at the splicing end face of the shield segment 1 on the other side of the segment annular gap 2, and then slowly push the shield segment 1 on the other side of the segment annular gap 2 under the thrust of the shield machine jack, and gradually push the connecting screw 6 and the positioning tenon 4 to the predetermined position until the segment annular gap 2 is completely closed, and the quick connection of the segment lining 1 at the position of the segment annular gap 2 is completed;

[0086] S6: Insert another tenon joint nut 5 into the special-shaped tenon hole 3 at the splicing end face of another shield segment 1, insert another positioning tenon 4, and then insert the other end of the connecting screw 6 to push another shield segment 1. Based on the guiding effect of the positioning tenon 4, under the action of the segment assembly machine, the segment annular seam 2 is slowly closed, and under the load of the shield machine jack, the segment annular seam 2 is completely closed, and the other end of the connecting screw 6 is completely pushed to the predetermined position, completing the rapid connection of the segment lining annular seam.

[0087] The above-mentioned special-shaped tenon hole 3 takes into account the functions of positioning and quick connection between rings. Its positioning function is mainly achieved through the positioning tenon 4, and the quick connection of the pipe segment annular seam 2 is mainly achieved through the insertion of straight bolts and the mechanical engagement between them and the internal steel teeth 56 of the nut in the tenon hole joint nut 5.

[0088] Based on the quick connection process of the special-shaped tenon hole 3, there is no need for a hand hole working space during the connection of the conventional bent bolt segment joints, nor is there a need for a tightening process between conventional bolts and nuts. Therefore, there is no weakening of the shield segment 1, and the overall stiffness and deformation resistance of the segment lining near the joint can be effectively improved. At the same time, no tightening and re-tightening operations are required, avoiding the loosening risk of conventional bolts.

[0089] The constraint between the mortise and tenon joint nut 5 and the shield segment 1 is mainly through the limiting effect of the compression spring and the rotatable steel plate 55. Therefore, when the underground space is subjected to extreme load conditions outside, such as earthquakes, when the longitudinal load increases to a certain value, the joint has a certain ability to open and adjust, ensuring that the underground space structure has the ability to adapt to external loads to a certain extent.

[0090] The method provided by the present invention should be noted during implementation:

[0091] 1. The mortise hole profile 31 is a special spatial profile, which is conical on the outside and regular hexagonal on the inside. At the same time, a slider groove 34 is reserved in the middle of each side of the inner part;

[0092] 2. The size of the tenon hole profile 31 needs to match the size of the tenon hole joint nut 5 on the one hand, and also needs to match the shape and size of the positioning tenon 4 on the other hand;

[0093] 3. The first compression spring 33 and the slider with ear 35 in the telescopic clamping point 32 need to be installed in place before the shield segment 1 is assembled. They need to be transported and hoisted in the underground space of the segment lining. Therefore, measures must be taken to firmly limit them in the reserved space of the slider groove 34, but they cannot affect the free compression of the first compression spring 33 and the slider with ear 35.

[0094] 4. The rebound potential of the second compression spring 53 in the rotary clamping point 51 after being compressed is much greater than the rebound potential of the first compression spring 33 in the telescopic clamping point 32 after being compressed. At the same time, the corresponding rotatable distance of the rotatable steel plate 55 in the rotary clamping point 51 in the natural state is much greater than the distance from the ear slider 35 to the expanded position 36 of the tenon hole contour, ensuring that the rotatable steel plate 55 can smoothly pass through the ear slider 35;

[0095] 5. The number and position of the steel teeth 56 inside the nut match the threads of the connecting screw 6, and at the same time ensure that the connecting screw 6 can only move in but not out, that is, relative to the inclination of the steel teeth 56 inside the nut, the connecting screw 6 can only move forward along the inclination direction of the steel teeth 56 inside the nut.

[0096] The structure of the present invention has the following characteristics and advantages:

[0097] 1) Based on the concept of "insertion-type quick connection", the present invention improves the shield tunnel segment joint connection process. On the basis of the current separation of the positioning and connection of the annular joints of small and medium-diameter shield tunnel segments, a new insertion-type mechanical bite joint quick connection process combining the positioning and connection functions has been developed, which effectively improves the assembly efficiency and overall quality of the shield tunnel segments.

[0098] 2) The new straight-insert segment joint connection process does not require the bending bolt tightening operation required by conventional small-diameter shield machines, and does not require hand holes to be reserved on the segment lining, thus avoiding the weakening of the overall stiffness of the segment lining at the joint position due to the presence of hand holes. This is beneficial to improving the overall longitudinal stiffness of the shield tunnel and reducing the risk of deformation in the later stage.

[0099] 3) The segment joint quick connector based on mechanical engagement of straight-insertion bolts and the composite functional concept based on "positioning + connection" described in the present invention can meet the requirements of fast and efficient connection of shield tunnel segment lining, and can effectively improve the overall quality and long-term stability of shield tunnels, and has obvious advantages in the complex environment of deep space. The solution has clear ideas, simple processes, and simple construction, with high economic and social benefits, and has broad application prospects in shield tunnel projects involving urban underground space development, rail transit, and railway projects.

[0100] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts is characterized by: The pipe segment annular seam quick joint comprises a special-shaped tenon hole (3), a positioning tenon (4), a tenon hole joint nut (5) and a connecting screw (6); The special-shaped tenon hole (3) is located at the splicing end surface of the annular seam position of the shield segment (1), and the inner wall of the special-shaped tenon hole (3) is provided with a reserved groove (37) on the side of the tenon hole; The outer wall of the tenon joint nut (5) is provided with a rotating clamping point (51); the tenon joint nut (5) is inserted into the special-shaped tenon hole (3), and the rotating clamping point (51) is clamped into a groove (37) reserved on the side of the tenon hole; A connecting screw (6) is inserted into the positioning tenon (4), and two ends of the connecting screw (6) are respectively inserted into the tenon hole joint nuts (5) on both sides of the segment annular seam (2); The positioning tenon (4) and the two tenon hole joint nuts (5) at the position of the segment annular seam (2) are connected to each other via the same connecting screw (6), thereby tightly splicing two adjacent shield segments (1) to each other.

2. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 1 is characterized in that: The mortise and tenon joint nut (5) is a hexagonal column; Correspondingly, the segment of the special-shaped tenon hole (3) corresponding to the tenon hole joint nut (5) is a hexagonal hole.

3. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 2 is characterized in that: The outer wall of the tenon joint nut (5) is provided with a nut side reserved groove (52), and the rotary clamping point (51) is located in the nut side reserved groove (52).

4. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 3 is characterized in that: The rotary clamping point (51) comprises a second compression spring (53), a rotating shaft (54) and a rotatable steel plate (55), one end of the rotatable steel plate (55) is connected to the front end of the reserved groove (52) on the side of the nut via the rotating shaft (54), and the other end of the rotatable steel plate (55) is connected to the rear end of the reserved groove (52) on the side of the nut via the second compression spring (53).

5. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 4 is characterized in that: The reserved groove (37) on the side of the tenon hole gradually expands from front to back, and a clamping point groove (34) is arranged on the inclined surface of the rear end, and a telescopic clamping point (32) is arranged in the clamping point groove (34).

6. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 5 is characterized in that: The telescopic clamping point (32) comprises a first compression spring (33) and a slider with an ear (35), wherein one end of the slider with an ear (35) is connected to the first compression spring (33) and the other end is provided with an ear protrusion; When the rotating clamping point (51) is clamped into the reserved groove (37) on the side of the tenon hole, the ear protrusion is limited on the outside of the rotatable steel plate (55).

7. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 6 is characterized in that: The rear end of the tenon joint nut (5) is provided with a non-through nut middle reserved hole (57) for inserting the connecting screw (6), and the inner wall of the nut middle reserved hole (57) is provided with nut internal steel teeth (56).

8. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 7 is characterized in that: The cross section of the positioning tenon (4) is circular, with equal cross-section parts at both ends and a variable cross-section part in the middle, and the cross-sectional area of ​​the variable cross-section part decreases from the middle to both sides; Correspondingly, the segment of the special-shaped tenon hole (3) corresponding to the equal-section portion is a circular hole of equal section, and the segment of the special-shaped tenon hole (3) corresponding to the variable-section portion is a circular hole with increasing cross-sectional area from front to back.

9. The segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 8 is characterized in that: The positioning tenon (4) comprises a tenon core (41), a tenon core (42) and a tenon wing (43), wherein the tenon core (41), the tenon core (42) and the tenon wing (43) are all symmetrically distributed about a central axis, wherein the variable cross-section portion is the tenon wing (43); The tenon core (42) and the tenon core (41) are both axially symmetrical cylindrical structures with a through hole arranged on the central axis. The tenon core (42) is sleeved outside the tenon core (41), and the tenon wing (43) is sleeved outside the tenon core (42).

10. The method for constructing a segment annular seam quick joint based on mechanical engagement of straight-insertion bolts according to claim 9, characterized in that: The method comprises: Inserting the tenon joint nut (5) into the special-shaped tenon hole (3) at the splicing end face of the shield segment (1) on one side of the segment annular seam (2); When the rotating clamping point (51) on the outer wall of the tenon joint nut (5) enters the special-shaped tenon hole (3), under the action of the rotating shaft (54), the rotatable steel plate (55) compresses the second compression spring (53) inwardly, and the rotatable steel plate (55) rotates inwardly and enters the special-shaped tenon hole (3) together; Continue to push the tenon joint nut (5), when the rotary clamping point (51) moves to the reserved groove (37) on the side of the tenon in the special-shaped tenon (3), the second compression spring (53) is reset, and under the action of the rotating shaft (54), the rotatable steel plate (55) rotates outward; At the same time, the end of the rotatable steel plate (55) contacts the slider with ears (35) of the telescopic clamping point (32), the first compression spring (33) is compressed, the slider with ears (35) moves into the clamping point groove (34), the rotatable steel plate (55) continues to rotate to the outside of the slider with ears (35), the first compression spring (33) is reset, the slider with ears (35) is clamped on the inside of the rotatable steel plate (55), the rotatable steel plate (55) is clamped into the reserved groove (37) on the side of the tenon hole, and the tenon hole joint nut (5) is fixed in the special-shaped tenon hole (3); Insert one end of the connecting screw (6) into the positioning tenon (4), and then insert it into the reserved hole (5) in the middle of the nut of the tenon joint nut (5); Another mortise joint nut (5) is inserted into the special-shaped mortise hole (3) at the splicing end face of another shield segment (1), and then the other end of the connecting screw (6) is inserted to push the other shield segment (1), thereby splicing the two shield segments (1) together.

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