Segment assembly structure for originating and receiving section without longitudinal tension and construction method thereof

Abstract

The present invention discloses a segment assembly structure and a construction method thereof for a starting and receiving section free of longitudinal tension. The segment assembly structure includes a pre-embedded inner sleeve and an assembled inner core, wherein there are two pre-embedded inner sleeves, each of which has a connection groove recessed inward from the end surface; the assembled inner core includes a first core body and a second core body. When two segments are installed longitudinally, the first core body and the second core body are respectively inserted into the corresponding connection grooves, and the two segments are assembled vertically up and down and inside and outside by interlocking the protrusions with the connection grooves, and the assembled inner core is hidden in the connection grooves of the two aligned assembled segments. The present invention not only solves the problems of misalignment, opening, and uneven force on the inner and outer arc surfaces between the segments, but also the inner and outer wall surfaces of the segment ring formed are neatly and beautifully spliced, do not occupy space, and achieve the effect of free of longitudinal tension. Moreover, since the internal part is not easy to rust, the bearing capacity and durability are ensured. In addition, the structure is simple, the assembly is convenient, and smoke, harmful gases and noise pollution will not be generated.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield tunnel construction, and specifically relates to a segment assembly structure for an initial receiving section without longitudinal tensioning. The present invention also relates to a segment ring docking construction method for an initial receiving section without longitudinal tensioning. Background Art

[0002] In recent years, with the rapid development of social economy and urbanization, shield tunnel technology has become an indispensable key technology in the construction of major transportation and other infrastructure in my country. In the important risk stages of shield tunneling construction, such as the shield starting, receiving or shallow overburden section, the surrounding water and soil pressure is small, and there is even no water and soil pressure at the negative ring, which makes it difficult to assemble the segment rings, and it is not easy to fix them. In addition, the self-stabilizing ability after assembly is poor, which is easy to cause opening and misalignment.

[0003] In the previous shield tunnel construction process, at the shield starting or receiving stage, the traditional segment ring reinforcement was connected by welding the segment pre-embedded steel plates. However, it has been found in practice that this connection method has the following disadvantages:

[0004] 1. The internal and external curved surfaces of the segment are subjected to uneven forces, which can easily cause local damage. The welded steel plates are usually located on the inner curved surface of the segment, which can easily lead to increased internal forces and damage to the local segment structure.

[0005] 2. The installation process is complicated, which affects the assembly speed of the pipe segments and produces large amounts of smoke, harmful gases and noise pollution;

[0006] 3. The curved steel plate welded inside the segment is prone to conflict with other internal structures of the segment and affect the flatness and aesthetics of the segment;

[0007] 4. Welded steel plates are prone to rust in humid environments or when water leaks into tunnels, which affects the bearing capacity and durability of the reinforced structure;

[0008] 5. The construction method of the joints between the rings mostly adopts the mortise and tenon structure, but the mortise and tenon structure cannot provide longitudinal tension and cannot control the amount of opening between the ring segments. Moreover, although the contact between the mortise and the groove can transform the pure shear into a combination of bending and shear, and increase the shear stiffness between the rings, it will also cause the ring segments to open.

[0009] Therefore, with the increasing amount of shield tunnel construction and the increasing diameter of tunnels, the assembly quality requirements for the starting, receiving and shallow cover segments are becoming increasingly higher, and the difficulty of assembly is becoming increasingly greater. It will become very important to solve the problems of misalignment, opening and uneven force of the shield starting, receiving and shallow cover segments. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a new segment assembly structure for the originating and receiving sections without longitudinal tensioning.

[0011] At the same time, the present invention also relates to a segment ring butt joint construction method for the originating and receiving sections without longitudinal tensioning.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0013] A pipe segment assembly structure for an originating and receiving section free of longitudinal tension, comprising a pre-embedded inner sleeve and an assembly inner core, wherein there are two pre-embedded inner sleeves, which are respectively embedded in the ends of two pipe segments to be assembled along the axial direction of the pipe segment ring to be assembled, wherein each pre-embedded inner sleeve has a connecting groove recessed inward from the end surface, the connecting groove gradually becomes smaller from the outside to the inside, and the notch end surface of the connecting groove is flush with the end surface of the pre-embedded pipe segment or the notch end surface is located inside the end surface of the pre-embedded pipe segment; the assembly inner core comprises a first core body and a second core body, wherein the first core body and the second core body match the connecting groove, and the outer periphery is respectively formed with protrusions that interlock with the connecting groove; when the two pipe segments are installed longitudinally, the first core body and the second core body are respectively inserted into the corresponding connecting grooves, and the two pipe segments are aligned and assembled vertically up and down and inside and outside by the interlocking of the protrusions and the connecting grooves, and the assembly inner core is hidden in the connecting grooves of the two aligned assembled pipe segments.

[0014] Preferably, the connecting groove includes a first groove body and a second groove body, wherein the first groove body is concave from the outside to the inside and the groove diameter gradually decreases, and the second groove body is concave from the side wall of the first groove body and forms a barb-type interlocking with the protrusion. This variable-diameter groove body mainly provides different forces according to different action points, so that the segment assembly can be free of longitudinal tensioning operation, thereby improving the assembly efficiency of the segment ring.

[0015] According to a specific implementation and preferred aspect of the present invention, the first trough is in a frustum shape, the first core and the second core are matched with the corresponding first trough respectively, and the protrusions are distributed at intervals along the length direction of the first core or the second core on the periphery of the first core and the second core, and interlock with the corresponding second trough. Such a layout provides a good locking force, improves the connection firmness between the segments, and also further reduces the misalignment and opening between the segments.

[0016] Preferably, the second groove body is annular, and the groove diameter formed by the plurality of second groove bodies from outside to inside gradually decreases and is divided into multiple levels of slots; the protrusions are correspondingly matched with each level of slots to form an annular shape. Such a step-by-step change can provide the best effect of avoiding longitudinal tension.

[0017] Furthermore, the diameter of the multi-stage slots decreases from outside to inside in an arithmetic progression, and the protrusions located at the periphery of the first core and the second core match the multi-stage slots. This regular change not only facilitates processing and molding, but also provides the best expected effect.

[0018] According to another specific implementation and preferred aspect of the present invention, the second slot body constituting each level of the slot is inclined from outside to inside, an inclined hook portion is formed between two adjacent levels of the slot, and a hook groove is formed between two adjacent protrusions, and when the first core body and the second core body are inserted into the connecting groove, the hook portion and the corresponding hook groove cooperate with each other to form an interlocking. This design greatly improves the effect of avoiding longitudinal tension.

[0019] Preferably, an inwardly recessed annular groove is formed at the end of each protrusion away from the insertion end, and the annular groove and the groove formed between each two adjacent protrusions constitute a hook groove. In this case, the interlocking effect provided is the best, and it is also very convenient to insert and assemble the core body.

[0020] Furthermore, the ratio of the diameter of the notch end surface of the first slot body to the height of the first slot body is 1:0.5 to 1. Such a limitation ensures that the segment assembly structure provides the best effect.

[0021] In addition, a tooth groove is formed on the outer periphery of the embedded inner sleeve, and it is embedded in the center of the end of the pipe segment, wherein the inner end of the embedded inner sleeve is also provided with embedded ribs distributed around the center of the embedded inner sleeve, the embedded ribs are made of the same material as the embedded inner sleeve, and extend along the length direction of the embedded inner sleeve.

[0022] At the same time, the first core body and the second core body in this example are both composed of a core rod and a core sleeve, wherein the core rod is made of steel and is integrally formed with high bearing capacity, and the core sleeve is made of industrial plastic, which is fire-resistant and corrosion-resistant, and is not prone to rust in the humid environment of the tunnel or when water leakage occurs, and is integrally injection molded, with multi-level protrusions formed on the surface.

[0023] Another technical solution of the present invention is: a construction method for butt jointing a segment ring for a starting and receiving section without longitudinal tensioning, the construction method adopts the above-mentioned segment assembly structure for a starting and receiving section without longitudinal tensioning, and the construction steps are as follows:

[0024] S1, inserting the assembled inner core from the first core body along its own length direction into the embedded inner sleeve of the shield segment to be assembled, or inserting the assembled inner core from the first core body into the embedded inner sleeve of the assembled shield segment, so that the first core body cooperates with the connecting groove, and the protrusion and the connecting groove are interlocked;

[0025] S2, aligning the two segments up and down, aligning the second core with the hollow connection grooves of the segments to be assembled and assembled, and then using longitudinal force to disassemble the second core into the aligned connection grooves along its own length direction, and forming an interlock between the protrusion and the connection groove;

[0026] S3. Install the segment connection bolts and lock the two segments up and down;

[0027] S4. Repeat the above steps in sequence until all the segments of the segment ring are assembled.

[0028] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] The present invention forms a concealed anti-shear and interlocking connection relationship between the protrusions and the corresponding connecting grooves, which not only solves the problems of misalignment, opening, and uneven force on the inner and outer curved surfaces between the segments, but also forms a neat and beautiful splicing of the inner and outer walls of the segment ring, which does not take up space and achieves the effect of no longitudinal tension. Moreover, since it is not easy to rust because it is hidden inside, the bearing capacity and durability are ensured. In addition, the structure is simple and the assembly is convenient, and no large smoke, harmful gases and noise pollution will be generated during the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the segment ring structure of this embodiment;

[0031] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of the middle segment assembly;

[0032] Figure 3 for Figure 2 Main view schematic diagram;

[0033] Figure 4 for Figure 3 AA section view;

[0034] Figure 5 is a schematic top view of the assembled segment ring of this embodiment;

[0035] Among them: J, segment assembly structure;

[0036] G. Segment;

[0037] H, segment ring;

[0038] 1. embedded inner sleeve; 10. tooth groove; 11. connecting groove; 111. first groove body; 112. second groove body;

[0039] 2. Assemble the inner core; 21. The first core body; 22. The second core body; x1. The core rod; x2. The core sleeve; t. The protrusion; s. The hook groove; s1. The annular groove; s2. The groove; g. The hooking part;

[0040] 3. Embedded reinforcement; 4. Connecting bolts. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0047] like Figure 1 and Figure 2 As shown, this embodiment is used for the segment assembly structure J of the originating and receiving section without longitudinal tensioning, which is used for vertically splicing two segments G from the end faces in the horizontal direction (that is, longitudinally splicing), and finally forms a segment ring H.

[0048] Specifically, the segment assembly structure J includes two pre-embedded inner sleeves 1 and an assembly inner core 2 symmetrically arranged from the joints of two segments G.

[0049] Combination Figure 3 and Figure 4 As shown, the embedded inner sleeve 1 is embedded in the end of the pipe segment G to be spliced, and is integrally formed with the pipe segment G.

[0050] In this example, a tooth groove 10 is formed on the outer periphery of the embedded inner sleeve 1, and is embedded in the center of the end of the segment G, wherein the inner end of the embedded inner sleeve 1 is also provided with embedded ribs 3 distributed around the center of the embedded inner sleeve 1. Here, the connection between the embedded inner sleeve and the segment is strengthened through the provision of the tooth groove, while also avoiding looseness due to stress.

[0051] Specifically, the embedded ribs 3 are made of the same material as the embedded inner sleeve 1 and extend along the length direction of the embedded inner sleeve 1. That is to say, when the segment assembly structure is implemented by splicing two segments, it can also ensure that the inner and outer curved surfaces of the segment structure are evenly stressed, and are located between the inner and outer curved surfaces of the segment, so that the inner and outer curved surfaces are relatively evenly stressed.

[0052] At the same time, the embedded inner sleeve 1 has a connection groove 11 which is recessed inward from the end surface, wherein when two pipe pieces G to be spliced ​​are fitted from the splicing end surfaces, the two connection grooves 11 are spliced ​​to form a closed connection cavity.

[0053] In this example, the connecting groove 11 includes a first groove body 111 whose groove diameter gradually decreases from the outside to the inside, and a plurality of second groove bodies 112 that are recessed inward from the inner wall of the first groove body 111 .

[0054] Specifically, the notch surface of the first slot body 111 is flush with the splicing end surface of the pipe segment G, which is convenient for installation and ensures that the two pipe segments G are spliced ​​smoothly from the splicing end surface.

[0055] The ratio of the diameter of the notch end surface of the first slot body 111 to the height of the first slot body 111 is 1:0.88. The taper formed in this way can best realize the most secure splicing of the two segments, and after splicing, the segment assembly structure is completely hidden and protected to avoid leakage, thereby extending the service life of the segment assembly structure.

[0056] Each second slot body 112 is annular and is divided into multiple slots from outside along the extension direction of the first slot body 111 , and the slot diameter formed by the multiple slots k gradually decreases from outside to inside.

[0057] In this example, the groove diameter (also the average groove diameter) of the multi-stage slot k decreases step by step from the outside to the inside in an arithmetic progression. This can not only greatly reduce the difficulty of processing and forming, but also the interlocking force formed after the assembled inner core 2 and the corresponding connecting groove 11 are connected can best solve the problems of misalignment, opening, and uneven force between the pipe segments.

[0058] The assembled inner core 2 includes a first core body 21 and a second core body 22, wherein the first core body 21 and the second core body 22 are respectively inserted into the connecting groove and fill the connecting cavity; and the outer periphery of the first core body 21 and the second core body 22 also respectively have a protrusion t that interlocks with each level of the corresponding connecting groove 11.

[0059] In this example, the first core 21 and the second core 22 are symmetrically arranged and matched with the corresponding first slot 111, respectively, wherein the protrusion t matches with the corresponding level of the slot in an annular shape. The design of a conical and annular slot at each level is convenient for processing and forming on the one hand, and for forming an interlock on the other hand, so that there are restrictions in both the axial and radial directions, thus greatly avoiding the occurrence of misalignment, opening, and uneven force between the two spliced ​​segments.

[0060] That is to say, the protrusions t located on the outer periphery of the first core 21 and the second core 22 match the multi-stage slots. In this way, the difficulty of processing and forming can be greatly reduced under the premise of meeting the interlocking and shearing resistance requirements, and the interlocking force formed can best solve the problems of misalignment, opening, and uneven force between the segments.

[0061] The second slot body 112 constituting each level of the slot is inclined from outside to inside, and an inclined hooking portion g is formed between two adjacent levels of the slot, and a hooking groove s is formed between two adjacent protrusions. When the first core body 21 and the second core body 22 are inserted into the connecting slot 11, the hooking portion g and the corresponding hooking groove s cooperate with each other to form an interlock. Here, the interlocking is formed by the cooperation of the inwardly inclined hooking portion and the hooking groove, which is similar to a barb, to avoid the opening between the segments, and at the same time, it can also effectively avoid the misalignment between the segments.

[0062] The second slot body 112 of each level of the slot is inclined inward at the same angle, which is convenient for processing and molding, and also convenient for plugging and assembling.

[0063] An inwardly recessed annular groove s1 is formed at the end of each protrusion t away from the insertion end, and the annular groove s1 and the groove s2 formed between each two adjacent protrusions constitute a hook groove s. The hook groove formed in this way can provide an optimal interlocking force.

[0064] At the same time, the two connecting grooves 11 are symmetrically arranged, and the first core body 21 and the second core body 22 are symmetrically arranged about the joint. In this way, it can be assembled arbitrarily, greatly reducing the assembly pressure and improving the assembly efficiency.

[0065] In this example, the first core body 21 and the second core body 22 both include a core rod x1 and a core sleeve x2 sleeved on the core rod x1 and having a protrusion t, wherein the core rod x1 of the first core body 21 and the second core body 22 are integrally formed, and the core sleeve x2 of the first core body 21 and the second core body 22 are integrally formed. The function of the core rod x1 is to improve the shear stiffness of the segment and effectively limit the misalignment between the segment rings, and the function of the core sleeve x2 is to facilitate insertion into the inner sleeve and to form an interlocking.

[0066] Specifically, the core sleeve x2 is made of industrial plastic, which is fire-resistant and corrosion-resistant, and is not prone to rust in a humid tunnel environment or when water leakage occurs. The internal core rod x1 is made of steel and has a high bearing capacity.

[0067] In addition, combined Figure 5 As shown, after each two pipe segments G are butt-jointed, they are reinforced with a plurality of connecting bolts 4 .

[0068] Specifically, a plurality of connecting bolts 4 are evenly spaced along the arc length of the segment G. Thus, through the cooperation between the connecting bolts 4 and the segment assembly structure J, the firmness of the segment ring H after assembly is greatly increased.

[0069] In summary, the installation process of the segment ring in this implementation is as follows:

[0070] S1, inserting the assembled inner core from the first core body along its own length direction into the embedded inner sleeve of the shield segment to be assembled, or inserting the assembled inner core from the first core body into the embedded inner sleeve of the assembled shield segment, so that the first core body cooperates with the connecting groove, and the protrusion and the connecting groove are interlocked;

[0071] S2, aligning the two segments up and down, aligning the second core with the hollow connection grooves of the segments to be assembled and assembled, and then using longitudinal force to disassemble the second core into the aligned connection grooves along its own length direction, and forming an interlock between the protrusion and the connection groove;

[0072] S3, installing the segment connection bolts, wherein the connection bolts extend along the segment installation direction and penetrate through the inside of the segment to lock the upper and lower segments, and at the same time, the ends of the connection bolts are connected to the ends of the segment by means of countersunk holes;

[0073] S4. Repeat the above steps in sequence until all the segments of the segment ring are assembled.

[0074] In summary, the segment assembly structure of this embodiment has the following advantages after the segment ring of the originating and receiving section is assembled:

[0075] 1. The concealed anti-shear and interlocking connection of the segment assembly structure not only solves the problems of misalignment, opening, and uneven force on the inner and outer curved surfaces between the segments, but also forms a very flat and beautiful inner and outer wall surface of the segment ring, which does not occupy space and achieves the effect of no longitudinal tensioning.

[0076] 2. After the segments are assembled, they are hidden inside, so they are not easy to rust in a humid environment or when water leaks in the tunnel, ensuring the bearing capacity and durability of the segment ring;

[0077] 3. The installation process is simple and efficient. At the same time, it is easy to assemble and does not require welding. Therefore, no large amount of smoke, harmful gases or noise pollution will be generated during the assembly process;

[0078] 4. The adjacent segments between the rings are relatively tightened by pre-embedded sleeves and interlocking connection inner bevels, which effectively improves the tensile and shear resistance of the segments between the rings. At the same time, the core body made of industrial plastic is not only convenient for the assembly of the core body into the connection groove, but also very convenient for the cooperation between the hook part and the hook groove to form interlocking, especially the use of annular grooves and grooves formed between each two adjacent protrusions to form hook grooves. The hook groove formed in this way can provide the best interlocking force. Finally, the interlocking part of the core body is industrial plastic, so the design allowable value of the deformation between the rings of the segment structure can be guaranteed;

[0079] 5. After the two segments are spliced ​​together, the segment assembly structure can ensure that the inner and outer curved surfaces of the segment structure are evenly stressed, and the interlocking structure is located between the inner and outer curved surfaces of the segment, so that the inner and outer curved surfaces are relatively evenly stressed;

[0080] 6. Under the premise of meeting the requirements of interlocking and anti-shearing, the coordinated design of the core and the connection groove can not only greatly reduce the difficulty of processing and forming, but also the interlocking force formed can best solve the problems of misalignment, opening, and uneven force between the segments;

[0081] 7. By setting the outer peripheral teeth of the embedded inner sleeve, the firmness of the connection between the embedded inner sleeve and the pipe segment is enhanced, and loosening due to stress is also avoided.

[0082] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them, but it does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A segment assembly structure for the originating and receiving section without longitudinal tensioning, characterized in that: The segment assembly structure comprises: There are two embedded inner sleeves, which are respectively embedded in the ends of the two segments to be spliced ​​along the axial direction of the segment rings to be spliced, wherein each of the embedded inner sleeves has a connection groove recessed inward from the end surface, the connection groove gradually becomes smaller from the outside to the inside, and the end surface of the groove of the connection groove is flush with the end surface of the embedded segment or the end surface of the groove is located inside the end surface of the embedded segment; An assembled inner core, comprising a first core body and a second core body, wherein the first core body and the second core body match the connecting groove, and the outer peripheries are respectively formed with protrusions interlocking with the connecting groove; When the two segments are installed in the longitudinal direction, the first core body and the second core body are respectively inserted into the corresponding connecting grooves, and the protrusions are interlocked with the connecting grooves to align and assemble the two segments in the longitudinal direction up and down and inside and outside, and the assembled inner core is hidden in the connecting grooves of the two aligned assembled segments; The connecting groove includes a first groove body and a second groove body, wherein the first groove body is recessed from the outside to the inside and the groove diameter gradually decreases, and the second groove body is recessed inward from the side wall of the first groove body and forms a barbed interlock with the protrusion; the first groove body is in the shape of a cone, the first core body and the second core body are matched with the corresponding first groove body respectively, and the protrusions are distributed at intervals on the periphery of the first core body and the second core body along the length direction of the first core body or the second core body, and interlock with the corresponding second groove body; the second groove body is annular, and the groove diameter formed by multiple second groove bodies from the outside to the inside gradually decreases, and is divided into multiple levels of slots; the protrusions are matched with each level of the slots in an annular shape, and the groove diameters of the multiple levels of the slots decrease step by step from the outside to the inside in an arithmetic progression; the protrusions located at the periphery of the first core body and the second core are matched with the multiple levels of the slots.

2. The segment assembly structure for the originating and receiving section without longitudinal tensioning according to claim 1 is characterized in that: The second slot body constituting each level of the slot is tilted from outside to inside, an inclined hook portion is formed between two adjacent levels of the slot, a hook groove is formed between two adjacent protrusions, and when the first core body and the second core body are inserted into the connecting groove, the hook portion and the corresponding hook groove cooperate with each other to form an interlocking.

3. The segment assembly structure for the originating and receiving section without longitudinal tensioning according to claim 2 is characterized in that: An inwardly recessed annular groove is formed at the end of each protrusion away from the insertion end, and the annular groove and the groove formed between each two adjacent protrusions constitute the hook groove.

4. The segment assembly structure for the originating and receiving section without longitudinal tensioning according to claim 1 is characterized in that: The ratio of the diameter of the notch end surface of the first slot body to the height of the first slot body is 1:0.5~1.

5. The segment assembly structure for the originating and receiving section without longitudinal tension according to any one of claims 1 to 4, characterized in that: The outer periphery of the embedded inner sleeve is formed with teeth and grooves, and is embedded in the center of the end of the pipe segment.

6. The segment assembly structure for the originating and receiving section without longitudinal tensioning according to claim 5 is characterized in that: The inner end of the embedded inner sleeve is also provided with embedded ribs distributed around the center of the embedded inner sleeve.

7. The segment assembly structure for the originating and receiving section without longitudinal tensioning according to claim 6 is characterized in that: The embedded ribs are made of the same material as the embedded inner sleeve and extend along the length direction of the embedded inner sleeve.

8. A method for butt jointing of segments without longitudinal tensioning in the originating and receiving sections, characterized in that: The construction method adopts the segment assembly structure for the originating and receiving section free of longitudinal tension as described in any one of claims 1 to 7, and the construction steps are as follows: S1, inserting the assembled inner core from the first core body along its own length direction into the embedded inner sleeve of the shield segment to be assembled, or inserting the assembled inner core from the first core body into the embedded inner sleeve of the assembled shield segment, so that the first core body cooperates with the connecting groove, and the protrusion and the connecting groove are interlocked; S2, aligning the two segments up and down, aligning the second core with the hollow connection grooves of the segments to be assembled and assembled, and then using longitudinal force to disassemble the second core into the aligned connection grooves along its own length direction, and forming an interlock between the protrusion and the connection groove; S3. Install the segment connection bolts and lock the two segments up and down; S4. Repeat the above steps in sequence until all the segments of the segment ring are assembled.

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