Post-embedded ring channel and construction method thereof, tunnel segment, tunnel structure

Abstract

This invention relates to the field of tunnel construction technology, and particularly to a post-embedded circumferential channel and its construction method, tunnel segments, and tunnel structure. The construction method of the post-embedded circumferential channel of this invention includes: Step A, preparing the post-embedded circumferential channel; wherein the post-embedded circumferential channel includes: a channel-shaped component, which is arc-shaped and has a channel structure formed on its inner front side; a connecting plate strip, connected to the back of the channel-shaped component and extending along the length direction of the channel-shaped component; at least N sets of positioning shear pins; Step B, preparing tunnel segments; Step C, installing the first side of the post-embedded circumferential channel; Step D, installing the second side of the post-embedded circumferential channel. This invention avoids interference with the reinforcing cage and formwork and the risk of construction deviation due to the post-embedded clamping channel at the circumferential joint between adjacent circumferential segments, and also eliminates the need for post-forming drilling, reducing damage to the segments and the risk of leakage. At the same time, it simplifies the tunnel segment prefabrication process.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a rear-embedded circumferential channel and its construction method, tunnel segments, and tunnel structure. Background Technology

[0002] As a mature tunnel construction technology, the shield tunneling method is widely used in subway tunnel sections and integrated utility tunnel projects. Taking integrated utility tunnel projects constructed using the shield tunneling method as an example, it is necessary to lay out utility tunnel supports to place cables, and these cable supports are usually fixed to the main structure of the shield tunnel segments.

[0003] In existing technologies, there are two main methods for fixing cable supports inside shield tunnels for integrated utility tunnels.

[0004] The first method is anchoring after rebar installation. This method has advantages such as simple process, mature technology, and strong adaptability, but its disadvantages are also quite prominent: drilling operations can easily weaken the integrity of the tunnel segment structure; if the drilling position conflicts with the internal rebar of the segment, it will further damage the load-bearing capacity of the segment structure; drilling positioning is difficult, and the waste hole rate is high, especially when drilling on curved surfaces, making it difficult to guarantee construction accuracy and quality; there are many workers on the construction site, the work intensity is high, the efficiency is low, and dust and noise lead to a poor working environment; there is also cross-interference with the shield tunneling process. The above-mentioned disadvantages of the process have led to the gradual replacement of the method of fixing cable supports by anchoring after rebar installation with the method of pre-embedding.

[0005] The second method is pre-embedded installation. This can be further divided into pre-embedded channels or sleeves and pre-embedded steel plates. Channels are usually made of materials such as channel steel and stainless steel, which have high strength and corrosion resistance. Pre-embedded channels involve embedding channel-shaped steel components on the inner arc surface of the tunnel segment structure, casting them integrally with the reinforced concrete tunnel segment, providing fixed support points for subsequently installed equipment, cable supports, etc. Pre-embedded channels are usually arranged in a ring along the tunnel segment lining, with one or more segments arranged in each lining ring. The longitudinal spacing of the pre-embedded channels along the formed tunnel is equal to the width of the tunnel segment ring, which means that the longitudinal spacing of the subsequently installed cable supports along the tunnel is also equal to the width of the tunnel segment ring.

[0006] Pre-embedded channels eliminate the need for drilling after segment assembly, causing no damage to the formed tunnel structure. Cable supports are connected to the channels using specialized T-bolts, resulting in high installation efficiency. However, pre-embedded channels require high installation precision. Incorrect placement, model, or deviation beyond acceptable limits can affect subsequent use and even lead to scrapping. Precise positioning and fixing of the channels on the precast segment mold are crucial to prevent displacement due to concrete vibration, making construction more challenging and prone to quality issues such as misalignment or grout leakage. Compared to post-installed anchor bolts, pre-embedded channels have a higher construction cost.

[0007] The pre-embedded channels are distributed circumferentially in the lining ring, and can be arranged in a segmented manner by pre-embedding in specific segments or in a full-ring arrangement by pre-embedding in all segments.

[0008] The method of embedding sleeves or steel plates is similar to that of embedding channels. Both are cast into the finished reinforced concrete tunnel segments during the production of precast tunnel segments. They are distributed in the tunnel lining ring as the segments are assembled, and then connected to cable supports by bolts or welding. The difference is that embedded channels appear as one or more arc segments on the cross-section of the tunnel lining ring, i.e., a linear distribution; while embedded sleeves or steel plates appear as single or multiple points on the cross-section of the lining ring.

[0009] In shield tunnel construction, the orderly rotation of the tunnel segments is required to fit the horizontal and vertical curves of the line and correct deviations. Especially when using universal wedge rings, the position of each segment on the cross section of the lining ring is uncertain. The channels, sleeves or steel plates embedded in the segments are also uncertain due to the uncertainty of the segment assembly position.

[0010] The assembly points of the tunnel lining ring are influenced by various factors, including the wedge shape, wedge amount, longitudinal and horizontal parameters of the tunnel, and the real-time attitude of the tunnel boring machine. This is a dynamic selection process, making it difficult to precisely determine the assembly point implementation plan for a specific ring segment in advance. However, the locations of cable supports within the tunnel cross-section are relatively fixed and cannot shift with the rotation of the lining ring. This means that the pre-embedded channels, sleeves, steel plates, and other structures for a specific segment will lose their target positions when the spatial positions of each segment are dynamically adjusted, making it difficult to guarantee their effectiveness. When using a full-ring pre-embedding and dense multi-point distribution method, redundancy is inevitable, resulting in low utilization and ultimately being economically unprofitable. Summary of the Invention

[0011] I. Technical problems to be solved

[0012] The present invention aims to at least partially solve one of the above-mentioned technical problems.

[0013] II. Technical Solution

[0014] The first aspect of this invention provides a construction method for a post-embedded circumferential channel. The construction method for the post-embedded circumferential channel includes:

[0015] Step A: Prepare the rear-mounted circumferential channel;

[0016] The rear-mounted circumferential channel includes: a channel-shaped component, which is arc-shaped and has a channel structure formed on its inner front side; a connecting plate strip, which is connected to the back of the channel-shaped component and extends along the length of the channel-shaped component; at least N sets of positioning shear pins, where N≥2; each set of positioning shear pins includes: two positioning shear pins disposed on both sides of the connecting plate strip; the root of the positioning shear pin is fixed to the connecting plate strip, and its front end extends in a direction perpendicular to the connecting plate strip;

[0017] Step B: Prepare tunnel segments;

[0018] Among them, the circumferential end face of the tunnel segment is provided with annular recesses. After two adjacent tunnel segments are spliced ​​together, the shape of the spliced ​​two annular recesses matches the shape of the positioning anti-shear pin.

[0019] Step C, installation on the first side of the rear-mounted circumferential channel;

[0020] Wherein, after being assembled to the i-th ring segment, i≥1, the rear-embedded circumferential channel is installed to the circumferential end face of the preset position, and the positioning anti-shear pin on the first side is inserted into the circumferential recess of the circumferential end face of the tunnel segment of the i-th ring segment; wherein, the circumferential end face is the circumferential end face formed between the i-th ring segment and the i+1-th ring segment.

[0021] Step D: Install on the second side of the rear-mounted circumferential channel;

[0022] When assembling the (i+1)th ring segment, the annular recess on the end face of the tunnel segment of the (i+1)th ring is pressed onto the positioning shear pin on the second side of the post-embedded circumferential channel. The shear positioning pin of the connecting plate of the post-embedded circumferential channel is embedded in the annular recess of the tunnel segments after splicing on both sides at the corresponding annular end face position. The connecting plate of the post-embedded circumferential channel is clamped in the annular joint between the tunnel segments on both sides.

[0023] In some embodiments of the present invention, when there are T post-embedded circumferential channels in the circumferential joint between the i-th ring segment and the (i+1)-th ring segment; step C includes: installing the t-th post-embedded circumferential channel to the corresponding circumferential joint end face position, with its first side positioning anti-shear pin inserted into the circumferential recess of the tunnel segment of the i-th ring segment at the circumferential joint end face position, t = 1, 2, ..., T; step D includes: pressing the circumferential recess of the tunnel segment of the (i+1)-th ring segment onto the positioning anti-shear pin on the second side of the t-th post-embedded circumferential channel, with the connecting plate of the t-th post-embedded circumferential channel clamped in the circumferential joint between the two tunnel segments, t = 1, 2, ..., T.

[0024] In some embodiments of the present invention, in step A, at least one of the following conditions is met: the positioning anti-shear pin is a frustum or truncated cone shape with a thicker root and a thinner front end; and / or the outer side of the positioning anti-shear pin is covered with an elastic material; and / or N sets of positioning anti-shear pins are distributed at equal central angles along the length of the connecting plate; and / or the positioning anti-shear pins are integrally formed or assembled with the connecting plate; and / or each set of positioning anti-shear pins includes: two positioning anti-shear pins symmetrically arranged on both sides of the connecting plate.

[0025] In some embodiments of the present invention, in step A, the far end of the connecting plate strip away from the grooved component extends to both sides in the vertical direction to form an enlarged end; in step B, a circumferential groove is provided on the end face of the tunnel segment, and after two adjacent ring tunnel segments are spliced, the shape of the spliced ​​two circumferential grooves matches the shape of the enlarged end; in steps C and D, the enlarged end of the connecting plate strip of the rear-embedded circumferential groove is embedded in the circumferential groove of the spliced ​​tunnel segments on both sides at the corresponding circumferential joint end face position.

[0026] In some embodiments of the present invention, steps C and D further include: filling the arc segment of the circumferential groove on the inner side of the circumferential joint between the i-th ring segment and the i+1-th ring segment without the post-embedded circumferential channel with elastic sealant or sealing strip.

[0027] In some embodiments of the present invention, step D is followed by step E, which involves connecting the cable bracket and the slotted component using T-bolts.

[0028] A second aspect of the present invention provides a rear-embedded circumferential channel. The rear-embedded circumferential channel includes: a channel-shaped member, which is arc-shaped and has a groove structure formed on its inner front side; a connecting plate strip connected to the back of the channel-shaped member and extending along the length direction of the channel-shaped member; at least N sets of positioning shear pins, where N≥2; each set of positioning shear pins includes: two positioning shear pins symmetrically arranged on both sides of the connecting plate strip; the root of each positioning shear pin is fixed to the connecting plate strip, and its front end extends in a direction perpendicular to the connecting plate strip.

[0029] In some embodiments of the present invention, at least one of the following conditions is met: the positioning shear pin is a frustum or truncated cone shape with a thicker root and a thinner front end; and / or the outer side of the positioning shear pin is covered with an elastic material; and / or N sets of positioning shear pins are distributed at equal central angles along the length of the connecting strip; and / or the positioning shear pin and the connecting strip are integrally formed or assembled; and / or the far end of the connecting strip away from the grooved component extends to both sides in the vertical direction to form an enlarged end; and / or the connecting strip is clamped in the annular joint between the tunnel segments on both sides. The internal shear pins are inserted into the annular recesses on both sides of the tunnel segments at the end face of the circumferential joint; and / or the groove of the groove structure matches the standard T-bolt; and / or the grooved component and the connecting plate are integrally formed metal components; and / or the junction of the grooved component and the connecting plate has a reinforcing structure; and / or the back of the grooved component is provided with an elastic buffer layer; and / or the back of the grooved component has the same radius of curvature as the inner arc surface of the tunnel segment; and / or the connecting plate is continuously or segmentally provided on the back of the grooved component.

[0030] A third aspect of the present invention provides a tunnel segment. The tunnel segment is adapted to a rear-embedded circumferential channel; an annular recess is provided on the circumferential end face of the tunnel segment, and after two adjacent ring tunnel segments are spliced, the shape of the spliced ​​two annular recesses matches the shape of the positioning anti-shear pin; wherein, the ring structure formed by splicing M tunnel segments has M≥3; an annular groove corresponding to the enlarged end of the connecting plate is provided on the circumferential end face of the tunnel segment.

[0031] A fourth aspect of the present invention provides a tunnel structure. The tunnel structure includes: one or more segments of the aforementioned embedded circumferential channel; two adjacent ring segments – the i-th ring segment and the (i+1)-th ring segment, wherein i ≥ 1, each ring segment is a lining ring formed by assembling M tunnel segments, M ≥ 3; the tunnel segments are as described above; wherein the positioning shear pins of the embedded circumferential channel are inserted into the annular recesses on the end faces of the annular joints of the adjacent two ring tunnel segments, and the connecting plate of the embedded circumferential channel is clamped within the annular joint between the adjacent two ring tunnel segments.

[0032] III. Beneficial Effects

[0033] As can be seen from the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art:

[0034] 1. Method: Inserted after installation, rather than pre-embedded.

[0035] This invention avoids interference with the reinforcing cage and formwork and the risk of construction misalignment by placing a clamping channel at the circumferential joint between adjacent ring segments. It also eliminates the need for drilling after forming, reducing damage to the segments and the risk of leakage. At the same time, it simplifies the segment prefabrication process.

[0036] 2. Location: Embedded in the annular seam of adjacent ring segments, not within the segments themselves.

[0037] The present invention provides greater flexibility in channel placement by placing the clamping channel at the annular joint between adjacent annular segments, rather than within the tunnel segments of the same annular segment.

[0038] 3. Fixing method: clamping and fixing, rather than being cast as a whole with the segment concrete.

[0039] In this embodiment, after the ring segments are assembled and in place, one or more sections of post-embedded circumferential channels are placed at the end face of the circumferential joint of the assembled lining ring, and the channels are clamped by the tunnel segment lining rings on both sides of the circumferential joint.

[0040] Compared to the construction method of "casting the channel and tunnel segments together as a whole", the clamping and fixing method in this embodiment is more convenient and flexible. The channel and tunnel segments can be made separately, which greatly reduces the manufacturing cost. On the other hand, the position of the channel can be adjusted during construction, which greatly improves the flexibility of construction.

[0041] 4. Flexibility: Avoid redundancy

[0042] This invention utilizes a post-embedded circumferential channel in the gap of the lining ring joint, effectively solving the problem of the uncertainty of the pre-embedded channel's position with the segment assembly point, and the problem of its position in the cross section of the lining ring deviating from the predetermined position due to the rotation of the segment; it also effectively solves the redundancy problem of the full-ring pre-embedded segment scheme along the circumference, and improves the utilization rate of the annular channel.

[0043] 5. Applicability: Non-full-ring arrangement of channels

[0044] During the assembly of tunnel segments, a post-embedded annular tunnel channel of corresponding length (arc length) is embedded to facilitate subsequent connection of cable trays, etc. That is, the present invention is applicable to scenarios where the channel is not arranged in a full ring. Attached Figure Description

[0045] Figure 1 This is a flowchart of the construction method for the embedded circumferential channel according to an embodiment of the present invention.

[0046] Figure 2 This is a perspective view of the embedded circumferential channel according to an embodiment of the present invention.

[0047] Figure 3 for Figure 2 The image shows a cross-sectional view of the end face of the annular seam of the segment lining in the installed state of the rear-embedded circumferential channel.

[0048] Figure 4 for Figure 2 The diagram shows the relationship between the rear-mounted circumferential channel and the tunnel segment joints on both sides in the installed state. Among them, (a) is the cross-section where positioning and shear pins are provided, and (b) is the cross-section where positioning and shear pins are not provided. Detailed Implementation

[0049] Existing technologies have many problems and shortcomings in fixing cable supports in shield tunnels. There is an urgent need for a more effective, reliable construction method that is adapted to the characteristics of shield tunneling technology. This is precisely what this invention aims to achieve, in order to improve construction efficiency, reduce construction costs, and better meet the actual needs of shield tunneling projects while ensuring structural safety and construction quality.

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0051] The first aspect of the present invention provides a construction method for a rear-embedded circumferential channel. Figure 2 This is a perspective view of the post-embedded circumferential channel in the construction method of the post-embedded circumferential channel according to an embodiment of the present invention. Figure 3 for Figure 2 The image shows a cross-sectional view of the end face of the annular seam of the segment lining in the installed state of the rear-embedded circumferential channel. Figure 4 for Figure 2 The diagram shows the relationship between the rear-embedded circumferential channel and the tunnel segment joints on both sides in the installed state. Figure 4 In the diagram, (a) is a cross-section with positioning and shear pins, and (b) is a cross-section without positioning and shear pins.

[0052] The construction method of the post-embedded circumferential channel in this embodiment includes: assembling the segment lining ring, reasonably selecting the assembly points according to the needs of horizontal and vertical curve fitting of the line, shield machine attitude adjustment and correction; placing the post-embedded circumferential channel 1 at the position where the cable support needs to be laid on the cross section of the lining ring, and placing the circumferential joint end face of the assembled lining ring, and inserting the positioning anti-shear pin 1-3 into the ring surface recess 2-3; continuing to assemble the next ring segment, so that the two adjacent ring segments are longitudinally clamped and the post-embedded circumferential channel is fixed in a ring; and using T-bolts to connect the cable support and the channel component 1-1.

[0053] More specifically, the construction method of the embedded circumferential channel in this embodiment of the invention includes:

[0054] Step A: Prepare the rear-mounted circumferential channel;

[0055] The rear-embedded circumferential channel includes: a channel-shaped component, which is arc-shaped and has a channel structure formed on its inner front side; a connecting plate strip, which is connected to the back of the channel-shaped component and extends along the length of the channel-shaped component; at least N sets of positioning anti-shear pins, where N≥2; each set of positioning anti-shear pins includes: two positioning anti-shear pins symmetrically arranged on both sides of the connecting plate strip; the root of the positioning anti-shear pin is fixed to the connecting plate strip, and its front end extends in a direction perpendicular to the connecting plate strip;

[0056] Step B: Prepare tunnel segments;

[0057] Among them, the circumferential end face of the tunnel segment is provided with annular recesses corresponding to the positioning anti-shear pins. After two adjacent tunnel segments are spliced ​​together, the shape of the spliced ​​two circumferential recesses matches the shape of the positioning anti-shear pins.

[0058] Step C, installation on the first side of the rear-mounted circumferential channel;

[0059] Wherein, after being assembled to the i-th ring segment, i≥1, the rear-embedded circumferential channel is installed to the circumferential end face of the preset position, and the positioning anti-shear pin on the first side is inserted into the circumferential recess of the circumferential end face of the tunnel segment of the i-th ring segment; wherein, the circumferential end face is the circumferential end face formed between the i-th ring segment and the i+1-th ring segment.

[0060] Step D: Install on the second side of the rear-mounted circumferential channel;

[0061] When assembling the (i+1)th ring segment, the annular recess on the end face of the tunnel segment of the (i+1)th ring segment is pressed onto the positioning shear pin on the second side of the post-embedded circumferential channel. The shear positioning pin of the connecting plate of the post-embedded circumferential channel is embedded in the annular recess after the tunnel segments on both sides are spliced ​​at the corresponding annular end face position. The connecting plate of the post-embedded circumferential channel is clamped in the annular joint between the two tunnel segments.

[0062] Step E: Connect the cable bracket and the trough-type component using T-bolts;

[0063] The slot of the grooved component is used to mate with a standard T-bolt to assemble cable brackets or other electromechanical components.

[0064] As can be seen, the construction method of the post-embedded circumferential channel in this embodiment completes the channel installation within the normal assembly rhythm of the shield tunnel, and has the following beneficial effects:

[0065] 1. Method: Inserted after installation, rather than pre-embedded.

[0066] This invention avoids interference with the reinforcing cage and formwork, as well as the risk of construction misalignment, caused by pre-embedded channels in the precast segment production process, by placing clamping channels at the circumferential joint between adjacent segments. It also eliminates the need for post-forming drilling, reducing damage to the segments and the risk of leakage. Furthermore, it simplifies the segment prefabrication process.

[0067] 2. Location: Embedded in the annular seam of adjacent ring segments, not within the segments themselves.

[0068] The present invention provides greater flexibility in channel placement by placing the clamping channel at the annular joint between adjacent annular segments, rather than within the tunnel segments of the same annular segment.

[0069] 3. Fixing method: clamping and fixing, rather than being cast as a whole with the segment concrete.

[0070] After the ring segments are assembled and in place, the present invention places one or more sections of post-embedded circumferential channels at the end face of the circumferential joint of the assembled lining ring, and uses the tunnel segment lining rings on both sides of the circumferential joint to clamp the channels.

[0071] Compared to the construction method of "casting the channel and tunnel segments together as a whole", the clamping and fixing method of this invention is more convenient and flexible. The channel and tunnel segments can be manufactured separately, which greatly reduces the manufacturing cost. On the other hand, the position of the channel can be adjusted during construction, which greatly improves the flexibility of construction.

[0072] 4. Flexibility: Avoid redundancy

[0073] This invention utilizes the gap between the lining ring seams to insert a circumferential channel, effectively solving the problem of uncertainty in the location of the pre-embedded channel as the segments are assembled, and the problem that its position on the cross section of the lining ring deviates from the predetermined position due to the rotation of the segments; it also effectively solves the redundancy problem of using a full-ring pre-embedded segment scheme along the circumference, and improves the utilization rate of the annular channel.

[0074] 5. Applicability: Non-full-ring arrangement of channels

[0075] During the assembly of tunnel segments, a post-embedded annular tunnel channel of corresponding length (arc length) is embedded to facilitate subsequent connection of cable trays, etc. That is, the present invention is applicable to scenarios where the channel is not arranged in a full ring.

[0076] It should be noted that while this invention offers the aforementioned beneficial effects, it may still bring other impacts during construction, requiring corresponding supporting measures. Specifically, the post-embedded tunnel channel is an arc, but the inner arc edge of the segment circumferential joint needs to accommodate the insertion of this post-embedded channel, leaving space throughout the entire circumference, which is equivalent to increasing the size of the caulking joint on the inner arc surface of the segment. Therefore, in sections where the post-embedded channel is not installed, the dimensions of the buffer lining and caulking waterproofing need to be increased.

[0077] The following provides a detailed description of each step in the construction method of the rear-embedded circumferential channel in this embodiment.

[0078] In step A, a rear-mounted circumferential channel is prepared. As shown in the figure, in this embodiment, the rear-mounted circumferential channel is an arc-shaped strip steel component, the arc length of which is determined according to the needs of the cross-sectional cable support layout range. The rear-mounted circumferential channel 1 in this embodiment includes:

[0079] The grooved component 1-1 has a groove structure formed on its inner front side;

[0080] Connecting plate strips 1-2 are connected to the back of the trough-shaped component, extend along the length of the trough-shaped component, and are clamped in the annular joint between the tunnel segments on both sides.

[0081] At least N sets of positioning anti-shear pins 1-3, N≥2; each set of positioning anti-shear pins includes: 2 positioning anti-shear pins symmetrically arranged on both sides of the connecting plate; the root of the positioning anti-shear pin is fixed to the connecting plate, and its front end extends in a direction perpendicular to the connecting plate to form an enlarged end.

[0082] The following is a detailed description of each component of the rear-embedded circumferential channel in this embodiment.

[0083] In this embodiment, a groove structure is formed on the inner side of the front of the groove component 1-1, and a groove opening is provided on the front of the groove structure. This groove opening is used to mate with T-bolts to install cable brackets. Taking a tunnel application as an example, in a tunnel, cables are placed on cable trays, and the cable trays are fixed to the structure through groove connectors (groove embedded components). The groove connectors (groove embedded components) include groove components and T-bolt connection pairs.

[0084] Among them, the non-open back side of the trough component 1-1 has the same curvature radius as the inner arc surface 2-1 of the segment lining ring 2, so that during construction and installation, the back side of the trough component can extend to the inner wall surface of the segment lining ring.

[0085] As shown in the figure, an elastic buffer layer 1-4 is provided on the non-opening back side of the trough component 1-1. This layer prevents rigid contact between the rear-embedded circumferential channel and the inner arc surface 2-1 of the segment lining ring, reduces stress concentration during the assembly of the segment lining ring, and ensures the waterproof effect of the lining ring. Those skilled in the art should understand that, in addition to the elastic buffer layer, the non-opening back side of the trough component can be provided with elastic rubber or other elastic material layers to prevent rigid contact between the rear-embedded circumferential channel and the inner arc surface of the segment lining ring.

[0086] As shown in the figure, in this embodiment, the connecting plate strip, which is far from the trough-shaped component, extends to both sides in the vertical direction to form an enlarged end. After the connecting plate strip is clamped between two adjacent tunnel segments, the enlarged end has sufficient anchoring force to ensure that the cable support does not undergo radial displacement during use. Furthermore, the dimensions of the connecting plate strip 1-2 do not affect the assembly of the tunnel segment lining rings.

[0087] Correspondingly, the circumferential end face 2-2 of the segment lining ring 2 has a structure that fits the shape of the rear-embedded circumferential channel 1, wherein the circumferential end face of the lining ring is provided with a circumferential groove along the circumferential direction, and the cross-sectional shape of the groove matches the connecting plate strip 1-2 with the enlarged end of the rear-embedded circumferential channel.

[0088] In this embodiment, multiple segments of post-embedded circumferential channels are provided on the circumferential seam of the lining ring. In other embodiments of the present invention, a longer or full-circumference post-embedded annular tunnel channel can also be provided on the circumferential seam, as long as care is taken to avoid the longitudinal seam 2-4 and the longitudinal bolt holes 2-5 of the lining ring, and the present invention can be achieved in the same way.

[0089] Regarding the connecting strip, the following aspects need to be explained:

[0090] (1) The connecting strips are either continuously installed or segmented.

[0091] The connecting strip serves two purposes: one end connects to the back of the channel-type component, and the other end connects to the enlarged end. The enlarged end and the groove on the matching segment annular surface allow the channel-type steel component to be fixed in its radial position.

[0092] In this embodiment, the connecting strip is continuously provided on the back side of the channel-shaped component, that is, the connecting strip is present on the back side of the channel-shaped component along its entire length. However, the present invention is not limited thereto.

[0093] In other embodiments of the present invention, the connecting strip can also be segmented, that is, the connecting strip is provided on the back of some positions of the grooved component, while the connecting strip is not provided on the back of some positions, as long as the reliable fixing of the grooved component can be achieved.

[0094] (2) Enlarge the end

[0095] In this embodiment, an enlarged end is provided at the far end of the connecting plate strip, and an circumferential groove matching its shape is provided on the circumferential end face of the tunnel segment. After the two adjacent tunnel segments are spliced ​​together, the shape of the spliced ​​two circumferential grooves matches the shape of the enlarged end; in steps C and D, the enlarged end of the connecting plate strip of the rear-embedded circumferential channel is embedded in the circumferential groove of the spliced ​​tunnel segments on both sides at the corresponding circumferential joint end face position.

[0096] The enlarged end and the shear positioning pin work together to generate sufficient anchoring force, ensuring that the cable bracket does not undergo radial displacement during use.

[0097] (3) The connecting strip and the channel component are integrally formed or separately formed.

[0098] In this embodiment, the connecting strip and the channel component are integrally formed steel components, and a reinforcing structure is formed at the junction of the channel component and the connecting strip to prevent the connecting strip from breaking off from the channel component. However, the present invention is not limited thereto.

[0099] In other embodiments of the present invention, the connecting strip can also be made of other metal or organic materials with sufficient strength, and the connecting strip and the channel component can be formed separately and then fixed together by welding or other means.

[0100] Those skilled in the art should understand that the above-mentioned variations of the connecting plate can also achieve the present invention and are also within the scope of protection of the present invention.

[0101] In this embodiment, the rear-mounted circumferential channel further includes: a plurality of positioning shear pins 1-3, which are disposed on one side of the connecting plate strip, with their roots fixed to the connecting plate strip and their front ends extending in a direction perpendicular to the connecting plate strip. These positioning shear pins are arranged in groups of two, symmetrically on both sides of the connecting plate strip.

[0102] Among them, N sets of positioning shear pins are distributed with equal central angles along the length of the connecting plate strip; the central angle between adjacent positioning shear pins is θ. The frustum-shaped mating surface has a self-guiding and self-centering effect, and the assembly allows for certain manufacturing and assembly deviations. Correspondingly, the circumferential joint end faces of two adjacent tunnel segments are machined with circumferential grooves that fit with the connecting plate strip and frustum-shaped recesses 2-3 that mate with the positioning shear pins, with the central angle between adjacent recesses being θ.

[0103] In this invention, positioning anti-shear pins are provided on the channel with equal central angles distributed along the circumference. The annular surface of the tunnel segment of the lining ring is provided with annular recesses that match the shape of the positioning anti-shear pins. This makes the positioning of the rear-embedded circumferential channel simpler and no longer limited by the influence of the rotation of the segment assembly point. The positioning anti-shear pins 1-3 can always match the annular recesses 2-3 at the predetermined position on the cross section of the lining ring.

[0104] The positioning shear pins 1-3 possess sufficient shear resistance to ensure that the cable support does not experience radial or circumferential displacement during use. The positioning shear pins, arranged at equal central angles, and the end face recesses form a reliable circumferential positioning and shear limit, suppressing circumferential slippage and deflection. Simultaneously, the uniform circumferential distribution ensures a more balanced distribution of shear force and clamping pressure, reducing localized stress and slippage caused by eccentricity, and facilitating standardized design and construction layout.

[0105] It is important to note that the annular recesses 2-3 on the tunnel segments corresponding to the positioning shear pins 1-3 have the following characteristics to ensure smooth segment demolding. First, these annular recesses are perpendicular to the end face of the segment's circumferential joint. These recesses do not affect the horizontal movement of the side mold during segment demolding, unlike annular recesses located on the inner arc surface of the segment that require consideration of the demolding angle. Second, the annular recesses are designed in a frustum or truncated cone shape to facilitate smooth demolding. Furthermore, the frustum or truncated cone shape facilitates insertion and does not affect the assembly of the segment lining ring.

[0106] To ensure the effectiveness of the positioning shear pins, it is necessary to consider factors such as assembly errors, misalignment, or circumferential joint opening. On the one hand, the geometric dimensions (internal clearance) of the annular recesses 2-3 distributed perpendicular to the end face of the circumferential joint of the segment lining can be designed to be slightly larger than that of the positioning shear pins 1-3 to provide appropriate installation allowance. On the other hand, the positioning shear pins 1-3 are wrapped with elastic rubber, which can accommodate a certain amount of deformation while ensuring stable installation and positioning.

[0107] Regarding the positioning anti-shear pin, the following aspects need to be explained:

[0108] (1) Determine the shape of the anti-shear pin

[0109] In this embodiment, in order for the tunnel arc-shaped segments to be demolded smoothly and for the positioning anti-shear pins to be inserted smoothly into the annular recesses, the positioning anti-shear pins are designed in the shape of a frustum or a cone, thereby improving the convenience of construction, but the present invention is not limited thereto.

[0110] In other embodiments of the present invention, the positioning anti-shear pin can also be designed as a cylinder, prism, or frustum. Although the construction convenience is slightly worse, the present invention can still be achieved.

[0111] (2) Grouping of anti-shear pins

[0112] In this embodiment, the positioning shear pins are arranged in groups of two, symmetrically positioned on both sides of the connecting plate strip. This arrangement improves construction convenience, but the invention is not limited thereto.

[0113] In other embodiments of the present invention, the positioning anti-shear pins can also be asymmetrically arranged on both sides of the connecting plate and strip, which can also achieve the present invention.

[0114] (3) Locate the anti-shear pin

[0115] In this embodiment, the positioning shear pins are distributed at equal central angles along the length of the connecting strip. This arrangement improves construction convenience, but the invention is not limited thereto.

[0116] In other embodiments of the present invention, the positioning anti-shear pins can also be arranged non-uniformly in the length direction of the connecting plate and strip, which can also achieve the present invention.

[0117] (4) Forming of positioning anti-shear pins

[0118] In this embodiment, the positioning anti-shear pin and the connecting plate are formed separately and then assembled during construction, but the present invention is not limited thereto.

[0119] In other embodiments of the present invention, the positioning anti-shear pin can be integrally formed with the connecting plate and strip, which can also achieve the present invention.

[0120] (5) Elastic rubber on the surface of the positioning shear pin

[0121] In this embodiment, the surface of the positioning anti-shear pin is wrapped with elastic rubber, which can accommodate a certain amount of deformation while ensuring stable installation and positioning, but the present invention is not limited thereto.

[0122] In other embodiments of the present invention, the surface of the positioning anti-shear pin may not be covered with elastic rubber, or may be covered with other elastic materials, and the present invention can still be achieved.

[0123] Those skilled in the art should understand that the above-mentioned variations of the connecting plate can also achieve the present invention and are also within the scope of protection of the present invention.

[0124] As can be seen from the above description, the post-embedded circumferential channel 1 of the present invention has circumferentially distributed positioning shear pins 1-3, connecting plate strips 1-2 with enlarged ends, and matching segment circumferential seam end face structure, which together ensure that the post-embedded circumferential channel has sufficient load-bearing capacity at any position and any arc length on the cross section of the lining ring, and can ensure that the channel does not undergo circumferential or radial displacement, which can significantly improve the stability of the post-embedded circumferential channel under dynamic load and temperature deformation.

[0125] In this embodiment, step B involves preparing tunnel segment 2. To accommodate the aforementioned rear-embedded circumferential channel, the tunnel segment has the following characteristics.

[0126] (1) The circumferential groove adapts to the enlarged end of the connecting plate strip.

[0127] In this embodiment, an enlarged end is provided at the far end of the connecting plate strip, and an circumferential groove matching its shape is provided on the circumferential end face of the tunnel segment. After the two adjacent tunnel segments are spliced ​​together, the shape of the spliced ​​two circumferential grooves matches the shape of the enlarged end; in steps C and D, the enlarged end of the connecting plate strip of the rear-embedded circumferential channel is embedded in the circumferential groove of the spliced ​​tunnel segments on both sides at the corresponding circumferential joint end face position.

[0128] For detailed features of the circumferential groove, please refer to the previous description of the enlarged end section, which will not be repeated here.

[0129] (2) Circular recess adapts to positioning anti-shear pin

[0130] In this invention, positioning anti-shear pins are provided on the channel with equal central angles distributed along the circumference, and annular recesses matching the shape of the positioning anti-shear pins are provided on the annular surface of the tunnel segment lining the ring. In steps C and D, the positioning anti-shear pins on both sides of the connecting plate are inserted into the annular recesses on the end faces of the tunnel segments on both sides of the pre-installation position.

[0131] This design simplifies the positioning of the rear-mounted circumferential channel, eliminating the influence of segment assembly point rotation. The positioning shear pins 1-3 and annular recesses 2-3 are always aligned at predetermined positions on the cross-section of the lining ring. Furthermore, the geometric dimensions of the annular recesses are slightly larger than those of the positioning shear pins.

[0132] For detailed information on the characteristics of the toroidal pit, please refer to the previous description of the enlarged end section, which will not be repeated here.

[0133] In this embodiment, step C involves installing the first side of the rear-mounted circumferential channel;

[0134] Wherein, after being assembled to the i-th ring segment, i≥1, the rear-embedded circumferential channel is installed to the circumferential end face of the preset position, and the positioning anti-shear pin on the first side is inserted into the circumferential recess of the circumferential end face of the tunnel segment of the i-th ring segment; wherein, the circumferential end face is the circumferential end face formed between the i-th ring segment and the i+1-th ring segment.

[0135] In this embodiment, step D involves installing the second side of the rear-mounted circumferential channel;

[0136] When assembling the (i+1)th ring segment, the annular recess on the end face of the tunnel segment of the (i+1)th ring segment is pressed onto the positioning anti-shear pin on the second side of the post-embedded circumferential channel, and the connecting plate of the post-embedded circumferential channel is clamped in the annular joint between the two tunnel segments.

[0137] Those skilled in the art should understand that a ring segment, also known as a "segment lining ring," is a ring structure formed by splicing at least three tunnel segments. The tunnel segments are cast and shaped before construction and then assembled into ring segments during construction. Multiple ring segments are connected sequentially to form a tunnel. Regarding the aforementioned expressions "first side" and "second side," they refer to the ring segments on both sides of the rear-embedded circumferential channel. These can also be replaced with "upstream side" and "downstream side," or "left side" and "right side," etc. Those skilled in the art should clearly understand their meaning, and will not elaborate further here.

[0138] In steps C and D, the following issues need to be specifically addressed:

[0139] (1) Installation position of the rear-mounted circumferential channel

[0140] The installation position of the post-embedded circumferential channel needs to avoid the longitudinal joint 2-4 and longitudinal bolt holes 2-5 of the lining ring, and the arrangement of equal central angles should be determined according to the site layout. This setting avoids conflicts with the stress and connection structure of the longitudinal joint, ensuring the overall stress continuity and construction safety.

[0141] (2) Waterproof

[0142] Since this embodiment involves inserting and fixing the channel after enlarging the inner circumferential joint size, it somewhat affects the waterproofing measures at the inner caulking area of ​​the segment circumference. Therefore, in sections with the channel installed, elastic rubber waterstop strips 2-6 are provided on the back of the channel. These strips buffer the rigid contact between the channel-type steel component and the concrete, and also provide a certain degree of water-stopping effect. In sections without the channel installed, elastic sealant or sealing strips are used to fill and seal the gaps after the inner circumferential joint size is enlarged.

[0143] In this embodiment, step E involves using T-bolts to connect the cable bracket and the slotted component.

[0144] In this embodiment, the slot of the grooved component is used to mate with a standard T-bolt to assemble cable brackets or other electromechanical components. This design ensures compatibility with standard profile systems, reduces non-standard parts, lowers costs, and facilitates later maintenance and replacement.

[0145] This concludes the description of the construction method for the embedded circumferential channel in this embodiment.

[0146] A second aspect of the present invention provides a rear-mounted circumferential channel. The rear-mounted circumferential channel includes:

[0147] The grooved component is in the shape of an arc strip, with a groove structure formed on the inner side of its front.

[0148] A connecting strip is attached to the back of the grooved component and extends along the length of the grooved component;

[0149] At least N sets of positioning anti-shear pins, N≥2; each set of positioning anti-shear pins includes: 2 positioning anti-shear pins symmetrically arranged on both sides of the connecting plate; the root of the positioning anti-shear pin is fixed to the connecting plate, and its front end extends in a direction perpendicular to the connecting plate.

[0150] Preferably, the rear-mounted circumferential channel satisfies at least one of the following: the positioning shear pin is a frustum or cone shape with a thicker root and a thinner front end; the outer side of the positioning shear pin is covered with an elastic material; the N sets of positioning shear pins are distributed at equal central angles along the length of the connecting plate strip; the positioning shear pin and the connecting plate strip are integrally formed or assembled; the far end of the connecting plate strip away from the channel component extends to both sides in the vertical direction to form an enlarged end; the connecting plate strip is clamped in the annular joint between the two tunnel segments; the positioning shear pin is inserted into the annular recess of the two tunnel segments at the end face of the annular joint; the slot of the channel structure matches a standard T-bolt; the channel component and the connecting plate strip are integrally formed metal components; a reinforcing structure is formed at the junction of the channel component and the connecting plate strip; an elastic buffer layer is provided on the back of the channel component; the back of the channel component has the same radius of curvature as the inner arc surface of the tunnel segment; the connecting plate strip is continuously or segmented on the back of the channel component.

[0151] It should be noted that the rear-embedded circumferential channel is the same as the rear-embedded circumferential channel in the foregoing embodiments. Therefore, the rear-embedded circumferential channel of the present invention can be referred to the foregoing relevant description. The entire contents of the relevant description are incorporated herein by reference and will not be repeated here.

[0152] A third aspect of the present invention provides a tunnel segment. The tunnel segment has annular recesses on its circumferential end face. After two adjacent tunnel segments are spliced, the shape of the spliced ​​annular recesses matches the shape of the positioning shear pin. In the ring structure formed by splicing M tunnel segments, M≥3. The tunnel segment has annular grooves on its circumferential end face corresponding to the enlarged end of the connecting plate.

[0153] It should be noted that the tunnel segment in question is the same as the tunnel segment in the foregoing embodiments. Therefore, the tunnel segment of the present invention can be referred to the foregoing description. The entire contents of the relevant description are incorporated herein by reference and will not be repeated here.

[0154] A fourth aspect of the present invention provides a tunnel structure. This tunnel structure is the same as the tunnel structure in the foregoing embodiments. Therefore, the tunnel structure of the present invention can be referred to the foregoing description. The entire contents of the relevant description are incorporated herein by reference and will not be repeated here.

[0155] This concludes the description of the various embodiments of the present invention. Based on the above description, those skilled in the art should have a clear understanding of the present invention.

[0156] It should be noted that for certain implementation methods, if they are not the key content of this invention and are well known to those skilled in the art, they are not described in detail in the accompanying drawings or text due to space limitations. In such cases, they can be understood by referring to the relevant prior art.

[0157] The directional terms used in this invention, such as "center," "lateral," "longitudinal," "top," "bottom," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," indicate only the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the purpose of facilitating and simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Also, the shapes and dimensions of the components in the drawings do not reflect actual size and proportion, but are only illustrative of embodiments of this invention.

[0158] The terms "connected" and "linked" used in this invention should be interpreted broadly unless otherwise explicitly specified and limited. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection of a portion of two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0159] Those skilled in the art will understand that in the claims and specification of this invention, the word "comprising" does not exclude the presence of elements (or steps) not listed in the claims. The word "a" or "an" preceding an element (or step) does not exclude the presence of a plurality of such elements (or steps).

[0160] Furthermore, the above embodiments are provided only to enable the invention to meet legal requirements, and the invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0161] Similarly, it should be understood that, for the sake of brevity, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of invention should not be construed as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, the various inventive aspects consist of fewer than all the features of the preceding single embodiment. Furthermore, embodiments may be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0162] The above specific embodiments have provided a detailed description of the purpose, technical means, and beneficial effects of the present invention. It should be understood that the purpose of the detailed description is to enable those skilled in the art to better understand the present invention, and it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for a rear-embedded circumferential channel, characterized in that, include: Step A: Prepare the rear-mounted circumferential channel; The rear-embedded circumferential channel includes: a channel-shaped component, which is arc-shaped and has a channel structure formed on its inner front side; a connecting plate strip, which is connected to the back of the channel-shaped component and extends along the length of the channel-shaped component; at least N sets of positioning shear pins, where N≥2; each set of positioning shear pins includes: two positioning shear pins disposed on both sides of the connecting plate strip; the root of the positioning shear pin is fixed to the connecting plate strip, and its front end extends in a direction perpendicular to the connecting plate strip; the positioning shear pin is in the shape of a frustum or truncated cone with a thicker root and a thinner front end; wherein the far end of the connecting plate strip away from the channel-shaped component extends in a vertical direction to both sides, forming an enlarged end; the N sets of positioning shear pins are distributed at equal central angles along the length of the connecting plate strip. Step B: Prepare tunnel segments; The tunnel segment has an annular recess on its circumferential end face. After two adjacent tunnel segments are spliced ​​together, the shape of the two annular recesses matches the shape of the positioning anti-shear pin. The tunnel segment also has an annular groove on its end face. After two adjacent tunnel segments are spliced ​​together, the shape of the two annular grooves matches the shape of the enlarged end. Step C, installation on the first side of the rear-mounted circumferential channel; Wherein, after being assembled to the i-th ring segment, i≥1, the post-embedded circumferential channel is installed to the circumferential joint end face of the preset position, and the positioning anti-shear pin on the first side is inserted into the circumferential recess of the circumferential joint end face of the i-th ring segment; wherein, the circumferential joint end face is the circumferential joint end face formed between the i-th ring segment and the i+1-th ring segment; wherein, the enlarged end of the connecting plate of the post-embedded circumferential channel is embedded in the circumferential groove of the two sides of the tunnel segment after splicing at the corresponding circumferential joint end face position; Step D: Install on the second side of the rear-mounted circumferential channel; During the assembly of the (i+1)th ring segment, the annular recess on the end face of the tunnel segment of the (i+1)th ring is pressed onto the positioning shear pin on the second side of the post-embedded circumferential channel. The shear positioning pin of the connecting plate of the post-embedded circumferential channel is embedded in the annular recess of the tunnel segments after splicing at the corresponding annular end face position. The connecting plate of the post-embedded circumferential channel is clamped in the annular joint between the two tunnel segments. The enlarged end of the connecting plate of the post-embedded circumferential channel is embedded in the annular groove of the tunnel segments after splicing at the corresponding annular end face position.

2. The construction method of the rear-embedded circumferential channel according to claim 1, characterized in that, When there are T embedded circumferential channels in the circumferential seam between the i-th ring segment and the (i+1)-th ring segment; Step C includes: installing the t-th embedded circumferential channel to the corresponding circumferential joint end face position, and inserting the positioning anti-shear pin on its first side into the circumferential recess of the tunnel segment of the i-th ring segment at the circumferential joint end face position, t=1,2,……,T; Step D includes: pressing the annular recess on the end face of the tunnel segment of the (i+1)th ring onto the positioning shear pin on the second side of the tth post-embedded circumferential channel, and clamping the connecting plate of the tth post-embedded circumferential channel in the annular joint between the two tunnel segments, t=1,2,……,T.

3. The construction method of the rear-embedded circumferential channel according to claim 1, characterized in that, In step A, at least one of the following conditions must be met: The outer side of the positioning anti-shear pin is wrapped with elastic material; and / or The positioning anti-shear pin and the connecting plate are integrally formed or assembled; and / or Each set of positioning anti-shear pins includes two positioning anti-shear pins symmetrically arranged on both sides of the connecting plate.

4. The construction method of the rear-embedded circumferential channel according to claim 1, characterized in that, Steps C and D further include: The arc segment on the inner side of the circumferential joint between the i-th ring segment and the i+1-th ring segment where the embedded circumferential channel is not installed shall be filled tightly with elastic sealant or sealing strip.

5. The construction method of the rear-embedded circumferential channel according to any one of claims 1 to 4, characterized in that, The step D is followed by step E, which involves connecting the cable bracket and the slotted component using T-bolts.

6. A rear-embedded circumferential channel, characterized in that, include: The grooved component is in the shape of an arc strip, with a groove structure formed on the inner side of its front. A connecting strip is attached to the back of the grooved component and extends along the length of the grooved component; At least N sets of positioning shear pins, N≥2; Each set of positioning anti-shear pins includes: two positioning anti-shear pins symmetrically arranged on both sides of the connecting plate strip; The root of the positioning shear pin is fixed to the connecting plate strip, and its front end extends in a direction perpendicular to the connecting plate strip; the positioning shear pin is a frustum or truncated cone shape with a thicker root and a thinner front end; the N sets of positioning shear pins are distributed at equal central angles along the length of the connecting plate strip; the connecting plate strip is clamped in the annular joint between the tunnel segments on both sides; the positioning shear pin is inserted into the annular recess of the tunnel segments on both sides at the end face of the annular joint; the far end of the connecting plate strip away from the grooved component extends to both sides in a vertical direction to form an enlarged end.

7. The rear-embedded circumferential channel according to claim 6, characterized in that, Meet at least one of the following: The outer side of the positioning anti-shear pin is wrapped with elastic material; and / or The positioning anti-shear pin and the connecting plate are integrally formed or assembled; and / or The slot opening of the groove structure matches a standard T-bolt; and / or The grooved component and the connecting strip are integrally formed metal components; and / or The junction between the grooved component and the connecting plate strip is reinforced; and / or The back of the grooved component is provided with an elastic buffer layer; and / or The back surface of the grooved component has the same radius of curvature as the inner arc surface of the tunnel segment; and / or The connecting plate strip is continuously or segmented on the back of the grooved component.

8. A tunnel segment, characterized in that, Adapted to the rear-embedded circumferential channel as described in claim 6; The tunnel segment has an annular recess on its circumferential end face. After two adjacent annular tunnel segments are spliced ​​together, the shape of the spliced ​​annular recess matches the shape of the positioning anti-shear pin. Among them, the ring structure formed by splicing M tunnel segments, M≥3; the circumferential end face of the tunnel segment is provided with an annular groove corresponding to the enlarged end of the connecting plate.

9. A tunnel structure, characterized in that, include: One or more segments of the rear-embedded circumferential channel as described in claim 6 or 7; Adjacent two ring segments - the i-th ring segment and the (i+1)-th ring segment, where i ≥ 1, each ring segment is a lining ring formed by assembling M tunnel segments, M ≥ 3; the tunnel segment is the tunnel segment as described in claim 8; The positioning shear pin of the rear-embedded circumferential channel is inserted into the annular recess on the end face of the annular joint of the adjacent two ring tunnel segments, and the connecting plate of the rear-embedded circumferential channel is clamped in the annular joint between the adjacent two ring tunnel segments.

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