Installation method of UHPC shield tunnel, single-hole shield tunnel and multi-hole shield tunnel

Abstract

The invention relates to the technical field of underground engineering, in particular to an installation method of a UHPC shield tunnel, a single-hole shield tunnel and a multi-hole shield tunnel. The annular duct piece comprises a plurality of arc-shaped duct piece units, the axial connecting sides of the duct piece units are in a broken line shape, and the duct piece units are connected in an inserted mode in the circumferential direction of a tunnel to form the annular duct piece with the axial connecting sides in the broken line shape. The included angle between the adjacent broken line sections is an obtuse angle; the broken line shape of the front side of the annular duct piece is matched with the broken line shape of the rear side of the annular duct piece; the multiple annular pipe pieces are sequentially connected in a staggered and inserted mode. The duct piece units are made of ultra-high performance concrete.

Description

Technical Field

[0001] The invention relates to the technical field of underground engineering, and in particular to an installation method of a UHPC shield tunnel, a single-hole shield tunnel and a multi-hole shield tunnel. Background Art

[0003] The development of large-span underground projects is becoming increasingly important as an efficient means to relieve traffic pressure and expand the use of underground space. In the development of urban underground space, it is particularly important to improve the requirements and structural performance of construction projects. Therefore, the innovation and progress of shield technology plays a vital role in increasing the use of underground space, alleviating urban congestion, and relieving traffic pressure. Among them, shield segments play a core role.

[0004] The shield segment is not only the main component in tunnel construction, but also the innermost line of defense of the tunnel, and undertakes the key task of resisting soil pressure, water pressure and other special loads. The joints of the shield segment are the key stress-bearing parts and the weak link of waterproofing. The stress and waterproofing performance of the segment joint nodes are the key factors affecting the operation and maintenance of the entire tunnel.

[0005] Most shield segments on the market are made of ordinary concrete. The solid design makes them heavy. The segments are connected by bolts. They can usually only be used in small-span tunnels, i.e. single-hole tunnels. There is still a lot of room for improvement in overall strength and waterproofing effect.

[0006] Existing shield segments are prone to damage or cracks during installation due to their inherent lack of strength, which increases the maintenance cost and construction risk of the tunnel, not only damaging the overall quality of the tunnel, but also potentially threatening the long-term structural safety.

[0007] The existing shield segments are connected by bolts, which leads to the disadvantage of assembly accuracy. During construction, foreign objects are easily mixed between the segments, causing segment misalignment and leakage. If the bolt tightening force is insufficient, the bolts may loosen or fall off, resulting in loose joints and cracks, which will endanger the waterproof performance and structural safety of the tunnel.

[0008] In order to ensure the stability and long-term safety of underground projects, it is necessary to continuously study and improve shield segments and their installation processes. Therefore, there is an urgent need for an installation method for UHPC shield tunnels, single-hole and multi-hole shield tunnels that can improve the problems of low strength, low assembly accuracy and easy loose connections of existing shield segments. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an installation method for a UHPC shield tunnel, a single-hole shield tunnel and a multi-hole shield tunnel, which solves the technical problems of low strength, low assembly accuracy and easy loosening of existing shield segments.

[0011] (II) Technical solution

[0012] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0013] A UHPC shield tunnel comprises: a plurality of annular segments continuously arranged along the axial direction of the tunnel;

[0014] The annular segment comprises a plurality of arc-shaped segment units, the axial connection side of the segment units is in a zigzag shape, and the plurality of segment units are plugged in along the circumference of the tunnel to form the annular segment with the axial connection side in a zigzag shape; the angle between adjacent zigzag segments is an obtuse angle;

[0015] The fold line shape of the front side of the annular segment matches the fold line shape of the rear side of the annular segment; a plurality of the annular segments are staggered and plugged in sequentially;

[0016] The segment unit is made of ultra-high performance concrete.

[0017] The front end of the tube unit is provided with a socket, and the rear end of the tube unit is provided with a first plug-in block, and the socket is plugged with the first plug-in block at the rear end of the tube unit at the front end;

[0018] A cavity communicating with the socket is provided inside the tube sheet unit.

[0019] The segment unit comprises: a standard block, a connection block and an adjustment block;

[0020] The circumferential connection side of the standard block is in a straight line shape;

[0021] The circumferential connection side of the connection block is in a straight line or a broken line shape;

[0022] The standard block is plugged into the linear circumferential connection side of the connection block;

[0023] The circumferential connecting sides of the adjustment blocks are all in the shape of a broken line, and the angles between the broken line segments are obtuse, so that the adjustment blocks can be inserted axially between the connecting blocks whose circumferential connecting sides are in the shape of a broken line.

[0024] The standard block includes a first standard block and a second standard block;

[0025] The first standard block and the second standard block each include four standard segments arranged continuously, the first standard segment is staggeredly connected to the second standard segment via an inclined segment, and the third standard segment is staggeredly connected to the fourth standard segment via the inclined segment;

[0026] The second standard segment and the third standard segment of the first standard block protrude forward from the first standard segment and the fourth standard segment;

[0027] The second standard segment and the third standard segment of the second standard block protrude rearwardly from the first standard segment and the fourth standard segment;

[0028] The angle between the inclined section and the standard section is an obtuse angle.

[0029] The connection block includes a first connection block, a second connection block and a third connection block;

[0030] The first connecting block comprises two standard segments and a connecting segment which are arranged continuously, wherein the first standard segment is staggered and connected with the second standard segment through an inclined segment; the circumferential connecting side of the first standard segment is in a straight line shape, and the circumferential connecting side of the connecting segment is in a broken line shape;

[0031] The second connection block comprises two standard segments arranged continuously, the first standard segment is staggered and connected with the second standard segment through an inclined segment; the circumferential connection sides of the second connection block are all straight lines;

[0032] The third connecting block includes a connecting section and four standard sections which are arranged continuously, the second standard section is staggeredly connected to the third standard section through an inclined section, and the fourth standard section is staggeredly connected to the fifth standard section through an inclined section, so that the third standard section and the fourth standard section protrude from the first connecting section, the second standard section and the fifth standard section;

[0033] The angle between the inclined section and the connecting section is an obtuse angle.

[0034] The connection block further comprises an upper airfoil connection block, wherein the upper airfoil connection block comprises symmetrically arranged first connection blocks and a first connection beam connected between the first connection blocks;

[0035] The first connecting beam is in a pentagonal structure, and second plug-in blocks are respectively provided on both sides of the top of the first connecting beam, and a first slot is provided on the side where the first connecting block is connected to the first connecting beam, and two first connecting blocks are respectively plugged into both sides of the top of the first connecting beam;

[0036] A first connecting piece for connecting to a load-bearing column is provided at the bottom of the first connecting beam.

[0037] The connection block further comprises a lower airfoil connection block, wherein the lower airfoil connection block comprises a symmetrically arranged second connection block and a second connection beam connected between the second connection blocks;

[0038] The second connecting beam is in an inverted pentagonal structure, and second plug blocks are respectively provided on both sides of the bottom of the second connecting beam, and a first slot is provided on the side where the second connecting block is connected to the second connecting beam, and two second connecting blocks are respectively plugged into the two sides of the bottom of the second connecting beam;

[0039] A second connecting piece for connecting to a load-bearing column is provided on the top of the second connecting beam.

[0040] A method for installing a single-hole shield tunnel, using the above-mentioned UHPC shield tunnel, the installation method comprises the following steps:

[0041] Step 1: Splice the first ring of annular segments along the circumference of the single-hole tunnel. The splicing method of the first ring of annular segments is as follows:

[0042] Step 1-1: insert three first standard blocks continuously along the circumferential direction at the bottom of the single-hole tunnel;

[0043] Step 1-2: inserting a second connection block along the circumferential direction on both sides of the first standard block;

[0044] Step 1-3: inserting a first connection block on both sides of the second connection block along the circumferential direction;

[0045] Step 1-4: inserting an adjustment block axially between the two first connection blocks to cap the annular segment;

[0046] Step 2: Splice the second ring of annular segments along the circumference of the single-hole tunnel. The splicing method of the second ring of annular segments is as follows:

[0047] Step 2-1: insert three second standard blocks at the front end of the first standard block in step 1 in a staggered manner; insert a second standard block at the front end of one of the first connecting blocks and the adjusting block in step 1;

[0048] Step 2-2: Connect one of the first connection blocks to both sides of the second standard block in step 2-1;

[0049] Step 2-3: inserting an adjustment block axially between the first connection blocks in step 2-2 to cap the annular segment;

[0050] Step 3: Repeat steps 1-2, and sequentially insert multiple annular segments along the axial direction of the single-hole tunnel to form a single-hole shield tunnel.

[0051] A method for installing a multi-hole shield tunnel, using the above-mentioned UHPC shield tunnel, the installation method comprises the following steps:

[0052] Step 1: Splice the first ring of annular segments along the circumference of the multi-hole tunnel. The method of splicing the annular segments along the radial direction is as follows:

[0053] Step 1-1: laying a first standard block along the circumferential direction at the bottom of the middle opening of the multi-hole tunnel, laying two first standard blocks along the circumferential direction at the bottom of the openings on both sides, and connecting the first standard blocks of adjacent openings through lower airfoil connection blocks;

[0054] Step 1-2: Insert a load-bearing column on the top of the lower wing-shaped connecting block;

[0055] Step 1-3: inserting a third connection block along the circumferential direction on both sides of the first standard block at the openings on both sides;

[0056] Step 1-4: inserting an upper airfoil connection block axially at the top of the load-bearing column;

[0057] Step 1-5: insert an adjustment block axially between the third connection block and the upper airfoil connection block, and insert an adjustment block axially between the upper airfoil connection block and the upper airfoil connection block to cap the annular segment.

[0058] Step 2: Splice the second ring of annular segments along the circumference of the multi-hole tunnel. The method of splicing the annular segments along the circumference is as follows:

[0059] Step 2-1: insert a second standard block on both sides of the second connection beam of the lower airfoil connection block in step 1, and insert a second standard block on the outside of the second standard block at the openings on both sides;

[0060] Step 2-2: inserting a first connection block along the circumferential direction on both sides of the second standard block in step 2-1;

[0061] Step 2-3: inserting a first connection block on both sides of the first connection beam of the upper airfoil connection block in step 1 respectively;

[0062] Step 2-4: inserting an adjustment block axially between the two first connection blocks of each hole to cap the annular segment;

[0063] Step 3: Repeat steps 1-2, and sequentially insert multiple annular segments along the axial direction of the multi-hole tunnel to form a multi-hole shield tunnel.

[0064] (III) Beneficial effects

[0065] The beneficial effects of the present invention are as follows: the shield tunnel provided by the present invention comprises a plurality of annular segments continuously arranged along the axial direction of the tunnel, the annular segments are spliced ​​end to end along the axial direction of the tunnel, the annular segments comprise a plurality of arc-shaped segment units, and the segment units are made of ultra-high performance concrete (UHPC), which enhances the overall strength of the structure and improves the bearing capacity, and can be applied to large-span multi-hole tunnels. The excellent performance of ultra-high performance concrete (UHPC) materials enables the segments to have outstanding resistance to erosion and damage in the face of a variety of harsh environments. The UHPC segment units have excellent strength, durability, wear resistance, toughness, and enhanced resistance to erosion, freeze-thaw, and penetration, as well as excellent explosion-proof and impact-proof properties, and can effectively cope with environmental challenges, thereby improving the safety and reliability of tunnel construction. It provides strong technical support for the safe construction of tunnels and other underground projects, ensuring the dual improvement of project quality and construction efficiency.

[0066] In terms of connection, the segment units adopt a hollow mortise and tenon structure design. The traditional bolt fixing method is abandoned between adjacent segment units. The staggered joint connection method significantly enhances the overall structural strength of the lining segment and prolongs its service life. Adjacent segments can fit tightly together, which improves the compactness and firmness of the structure and effectively resists external loads and vibrations. The mortise and tenon structure without bolts makes the gap between the segments smaller, improving the integrity and waterproof performance of the shield tunnel. It also facilitates the installation of the segments, improves construction efficiency, and simplifies the subsequent maintenance work.

[0067] The segment unit includes a standard block, a connecting block and an adjustment block, wherein the standard block and the connecting block can be inserted and fixed along the circumference of the tunnel, and the adjustment block is inserted to the top of the annular segment along the axial direction of the tunnel for positioning and capping, which facilitates the assembly of the segment unit and improves the assembly efficiency of the segment unit.

[0068] By setting up wing-shaped segments and load-bearing columns to form a connecting structure between multiple tunnels, large-span multi-hole shield tunnels can be assembled. Without sacrificing the overall bearing capacity of the underground structure, the span is increased, thereby increasing the usable underground space, which helps to reduce urban population density and ease traffic pressure.

[0069] The hollow structure inside the segment unit reduces the weight of the unit segment and enables the segment unit to be hoisted using standard mechanical equipment. Although the cost of ultra-high performance concrete (UHPC) is higher than that of ordinary concrete, the hollow structure design can keep the manufacturing cost at a level similar to that of traditional ordinary concrete solid shield segments, achieving a balance between material economy and performance superiority. Compared with ordinary prefabricated assembly structures, this lining structure has a lower reinforcement ratio, but still fully meets the seismic requirements. When the segment unit is damaged, the segment unit can be repaired by grouting into the cavity to restore its integrity, making it easier to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 is a three-dimensional diagram of a first standard block of the present invention;

[0071] Figure 2 is a three-dimensional diagram of a second standard block of the present invention;

[0072] Figure 3 is a three-dimensional diagram of a first connecting block of the present invention;

[0073] Figure 4 is a three-dimensional diagram of a second connecting block of the present invention;

[0074] Figure 5 is a three-dimensional diagram of a third connecting block of the present invention;

[0075] Figure 6 A three-dimensional diagram of an adjustment block of the present invention;

[0076] Figure 7 A perspective view of an upper airfoil block of the present invention;

[0077] Figure 8 is a three-dimensional view of the lower airfoil block of the present invention;

[0078] Fig. 9 It is a disassembled screenshot of the connection structure of the upper airfoil connection block, the lower airfoil connection block and the load-bearing column of the present invention;

[0079] Fig.10 This is step 1-1 of embodiment 2 of the present invention;

[0080] Fig.11 It is steps 1-2 of embodiment 2 of the present invention;

[0081] Fig.12 It is steps 1-3 of embodiment 2 of the present invention;

[0082] Fig.13 It is steps 1-4 of embodiment 2 of the present invention;

[0083] Fig.14 This is step 2-1 of embodiment 2 of the present invention;

[0084] Fig.15 This is step 2-2 of embodiment 2 of the present invention;

[0085] Fig.16 It is step 2-3 of embodiment 2 of the present invention;

[0086] Fig.17 This is step 1-1 of embodiment 3 of the present invention;

[0087] Fig.18This is step 1-1 of embodiment 3 of the present invention;

[0088] Fig.19 It is steps 1-2 of embodiment 3 of the present invention;

[0089] Fig. 20 It is steps 1-3 and 1-4 of embodiment 3 of the present invention;

[0090] Fig.21 It is steps 1-5 of embodiment 3 of the present invention;

[0091] Fig. 22 This is step 2-1 of embodiment 3 of the present invention;

[0092] Fig.23 It is step 2-2 and step 2-3 of embodiment 3 of the present invention;

[0093] Fig.24 These are steps 2-4 of Example 3 of the present invention.

[0094] [Description of Reference Numerals]

[0095] 1: annular segment; 11: socket; 12: first plug block; 13: cavity; 14: second plug block; 15: first slot; 16: second slot; 17: third plug block;

[0096] 21: first standard block; 22: second standard block; 23: standard section; 24: inclined section;

[0097] 31: first connecting block; 32: second connecting block; 33: third connecting block; 34: connecting section; 35: first connecting beam; 36: first connecting member; 37: second connecting beam; 38: second connecting member;

[0098] 4: adjustment block; 41: adjustment segment;

[0099] 5: load-bearing column; 51: installation port;

[0100] 61: upper airfoil connection block; 62: lower airfoil connection block. DETAILED DESCRIPTION

[0101] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0102] The professional terms of this application are explained as follows:

[0103] The lining structure refers to a permanent supporting structure built with reinforced concrete and other materials along the perimeter of the tunnel to prevent deformation or collapse of the surrounding rock. The shield tunnel in this application belongs to the lining structure.

[0104] The mortise and tenon structure refers to a concave-convex connection method used on two components. The protruding part is called the tenon; the concave part is called the mortise, and the tenon and the mortise are plugged together to play a connecting role. The mortise and tenon structure of the present application refers to a plug-in connection method between the pipe segment units, so that the folded line end faces of adjacent annular pipe segments 1 fit together.

[0105] The present invention provides a UHPC shield tunnel, comprising a plurality of annular segments 1 continuously arranged along the axial direction of the tunnel, wherein the plurality of annular segments 1 are sequentially connected end to end along the axial direction of the tunnel to form a shield tunnel. The annular segment 1 is formed by splicing a plurality of arc-shaped segment units, and the segment units are made of ultra-high performance concrete (UHPC), which enhances the overall strength of the structure and improves the bearing capacity.

[0106] In terms of the connection method of the segment units, the traditional bolt fixing method is abandoned and a precise mortise and tenon structure is adopted for splicing. The segment unit includes a standard block, a connection block and an adjustment block 4. When splicing the annular segment 1, the standard block and the connection block can be plugged and fixed along the circumference of the tunnel. When splicing to the top of the annular segment 1, it is difficult to plug along the circumference of the tunnel due to the small reserved splicing position. Therefore, an adjustment block is set to be inserted between adjacent connection blocks along the axial direction of the tunnel for capping. The front and rear sides of the spliced ​​annular segment 1 are in a broken line shape. The adjacent annular segments 1 are plugged and fixed. The front side of the annular segment 1 fits the shape of the rear side of the adjacent annular segment 1, so that the adjacent segments can be tightly fitted, thereby making the gap between the segment units smaller. The compactness and firmness of the segment connection structure are improved, external loads and vibrations are effectively resisted, and the integrity and waterproof performance of the shield tunnel are improved.

[0107] By setting up wing-shaped segments and load-bearing columns to form a connecting structure between multiple tunnels, the segment units can be assembled to form a large-span multi-hole shield tunnel. Without sacrificing the overall bearing capacity of the underground structure, the span is increased, thereby increasing the usable underground space, which helps to reduce urban population density and ease traffic pressure.

[0108] In addition, the segment units with mortise and tenon structure are easy to install and can improve construction efficiency.

[0109] The segment unit has a cavity 13 inside, which reduces the weight of the unit segment and enables the segment unit to be hoisted using standard mechanical equipment. Although the cost of ultra-high performance concrete (UHPC) is higher than that of ordinary concrete, the hollow structure design can control the manufacturing cost to a level similar to that of traditional ordinary concrete solid shield segments, achieving a balance between material economy and performance superiority. Compared with ordinary prefabricated assembly structures, this lining structure has a lower reinforcement ratio, but still fully meets the seismic requirements.

[0110] When the segment unit is damaged, it can be repaired by injecting grout into the cavity 13 to restore its integrity, thus simplifying the subsequent maintenance work.

[0111] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0112] Embodiment 1:

[0113] This embodiment provides a UHPC shield tunnel, comprising: a plurality of annular segments 1 continuously arranged along the axial direction of the tunnel, the front and rear sides of the annular segments 1 are in a zigzag shape, the angle between adjacent zigzag segments is an obtuse angle, the zigzag shape of the front side of the annular segment 1 matches the zigzag shape of the rear side of the annular segment 1, so that the annular segments 1 can be plugged end to end to form a continuous shield tunnel. The annular segment 1 includes a plurality of arc-shaped segment units, and a single segment unit is plugged along the circumference of the tunnel to form an annular segment 1. The axial connection side of the segment unit is in a folded shape, and the segment units of the axially adjacent annular segments 1 are staggered and plugged, so that the segment units can be interlocked with each other through the zigzag axial connection side after being plugged, thereby improving the stability and deformation resistance of the overall structure of the shield tunnel, limiting the displacement of the segment in the horizontal direction, reducing local stress concentration, and reducing the risk of leakage. The segment unit is prefabricated in the factory using ultra-high performance concrete (UHPC), which enhances the overall strength of the structure and improves the bearing capacity.

[0114] The segment unit includes: a standard block, a connecting block and an adjusting block 4. The circumferential connecting sides of the plurality of standard blocks, connecting blocks and adjusting blocks 4 are plugged into a second plug block 14 and a first slot 15 to form an annular segment 1. The axial connecting sides of the standard blocks, connecting blocks and adjusting blocks 4 are plugged into a socket 11 and a first plug block 12.

[0115] The circumferential connection side of the standard block is straight, and the axial connection side of the standard block is broken line. The standard block is set in the lower half of the shield tunnel. Figure 1-2As shown, the standard block includes a first standard block 21 and a second standard block 22, and the first standard block 21 and the second standard block 22 each include four standard sections 23 arranged continuously, wherein the first standard section 23 and the second standard section 23 are staggeredly connected by an inclined section 24, and the third standard section 23 and the fourth standard section 23 are staggeredly connected by an inclined section 24, the standard section 23 is a rectangular structure, the inclined section 24 is a diamond structure, and the angle between the inclined section 24 and the standard section 23 is an obtuse angle, so that the side surface where the first standard block 21 and the second standard block 22 are axially connected is in a broken line shape. By setting the standard block with a broken line shape on the front and rear sides, the front and rear adjacent segment units can fit tightly, and since the angles of the joints are all obtuse angles, the wear of the adjacent segments on the angles during installation and use can be reduced, thereby extending the service life of the segment units.

[0116] The second standard section 23 and the third standard section 23 of the first standard block 21 protrude forward from the first standard section 23 and the fourth standard section 23, and the second standard section 23 and the third standard section 23 of the second standard block 22 protrude backward from the first standard section 23 and the fourth standard section 23, that is, the staggered positions of the second standard section 23 and the third standard section 23 of the first standard block 21 and the second standard block 22 are opposite. The second standard block 22 is used to cooperate with the first standard block 21 and the lower wing-shaped connection block 62 when splicing a large-span multi-hole shield tunnel, so that the axially adjacent segment units can be staggered and plugged.

[0117] Each standard section 23 is provided with a cavity 13 inside, and a socket 11 connected to the cavity 13 is provided at the front end of each standard section 23, and a first plug block 12 is provided at the rear end. The socket 11 and the first plug block 12 are used to connect axially (front and back) adjacent standard blocks. A through cavity 13 is provided inside the inclined section 24. The weight of the pipe segment is reduced by providing the cavity 13 inside the standard section 23 and the inclined section 24. The hollow design is not only convenient for maintenance and care, but also allows the standard block to be repaired and restored to its integrity by grouting into the cavity 13 when the pipe segment is damaged. At the same time, the standard block is made of ultra-high performance concrete (UHPC), which can reduce the weight of the pipe segment while ensuring the strength of the standard block.

[0118] Waterproof strips are provided on the sides of the first plug-in block 12 to improve the waterproof performance between adjacent tube segment units.

[0119] The circumferential connection side of the connection block is in a straight line or a broken line shape. The connection block is arranged in the upper half of the shield tunnel and is used to connect the standard block and the adjustment block 4. The connection block includes a first connection block 31, a second connection block 32 and a third connection block 33, see the attached Figure 3As shown, the first connection block 31 includes two standard segments 23 and a connection segment 34 arranged continuously, wherein the first standard segment 23 and the second standard segment 23 are staggeredly connected via the inclined segment 24, so that the axially connected side of the first connection block 31 is in a broken line shape.

[0120] A circumferential connection side of the connecting section 34 is provided with a folded angle, which is an obtuse angle, so that the front end width of the connecting section 34 is smaller than the maximum width of the rear end. The connecting section 34 is used to connect the adjustment block 4 and cooperate with the circumferential connection side of the adjustment block 4 so that the adjustment block 4 can be inserted axially between adjacent first connecting blocks 31, so as to facilitate the capping of the annular segment 1.

[0121] See attached Figure 4 As shown, the second connection block 32 includes two standard segments 23 arranged continuously, wherein the first standard segment 23 and the second standard segment 23 are staggered and connected via the inclined segment 24, so that the axial connection side of the second connection block 32 is in a broken line shape. The circumferential connection sides of the second connection block 32 are all straight lines, and the second connection block 32 is used to connect the standard block and the circumferential connection side of the connection block in a straight line shape.

[0122] See attached Figure 5 As shown, the third connection block 33 includes a connection section 34 and four standard sections 23 which are arranged continuously, that is, the first section is the connection section 34, and the circumferential connection side has a folded angle, and the second to fifth sections are standard sections 23. Among them, the second standard section 23 is staggeredly connected with the third standard section 23 through the inclined section 24, and the fourth standard section 23 is staggeredly connected with the fifth standard section 23 through the inclined section 24, so that the third standard section 23 and the fourth standard section 23 protrude from the first connection section 34, the second standard section 23 and the fifth standard section 23, so that the axial connection side of the third connection block 33 is in a broken line shape. By setting a broken line-shaped connection block, the axially (front and back) adjacent segment units can fit tightly, and the folded angles of the joints at the connection are all obtuse angles, which can reduce the wear of the adjacent segments at the folded angles during installation and use, and extend the service life of the segment units. The side surface of the first connecting section 34 of the third connecting block 33 is provided with a folded angle. By arranging the third connecting block 33 to cooperate with the upper airfoil connecting block 61, the adjustment block 4 can be inserted axially between the adjacent third connecting block 33 and the upper airfoil connecting block 61 to achieve the capping of the annular segment 1.

[0123] Each standard section 23 and connecting section 34 is provided with a cavity 13 inside. The front end of each standard section 23 and connecting section 34 is provided with a socket 11 connected to the cavity 13, and the rear end is provided with a first plug block 12. The socket 11 and the first plug block 12 are used to connect axially (front and back) adjacent connecting blocks. A through cavity 13 is provided inside the inclined section 24. The weight of the pipe segment is reduced by providing the cavity 13 inside the standard section 23, the connecting section 34 and the inclined section 24. The hollow design is not only convenient for maintenance and care, but also can repair the connecting block and restore its integrity by grouting into the cavity 13 when the pipe segment is damaged. At the same time, the connecting block is made of ultra-high performance concrete (UHPC), which can reduce the weight of the pipe segment while ensuring the strength of the connecting block.

[0124] See attached Figure 6 As shown, the adjustment block 4 includes two adjustment segments 41 symmetrically arranged along the midline, and the circumferential connection side of the adjustment segment 41 is provided with a folded angle, which is an obtuse angle, so that the maximum width of the front end of the adjustment block 4 is greater than the width of the rear end, so that the adjustment block 4 can cooperate with the circumferential connection side of the connection segment 34. The adjustment block 4 is used to connect the first connection block 31 or the third connection block 33 to cap the annular segment 1.

[0125] When the annular segment 1 is assembled to the top, the spacing between adjacent segment units is small, and it is usually difficult to plug in along the circumferential direction. By combining the adjustment block 4 with the first connecting block 31 or the third connecting block 33, the adjustment block 4 can be inserted axially between two oppositely arranged first connecting blocks 31 or third connecting blocks 33, so that the adjustment block 4 fits tightly with the first connecting block 31 or the third connecting block 33, which facilitates the capping of the annular segment 1 while ensuring the compactness and firmness of the structure.

[0126] Each adjustment section 41 of the adjustment block 4 is provided with a cavity 13 inside, and a socket 11 connected to the cavity 13 is provided at the front end of each adjustment section 41, and a first plug block 12 is provided at the rear end. The socket 11 and the first plug block 12 are used to connect the axially (front and back) adjacent connection blocks or adjustment blocks 4. A cavity 13 with a triangular structure is provided inside the corner of the adjustment section 41. By providing the cavity 13 inside the connection section 34 and the corner, the weight of the adjustment block 4 is reduced. When the pipe segment is damaged, the connection block can be repaired by grouting into the cavity 13 to restore its integrity. The adjustment block 4 is made of ultra-high performance concrete (UHPC), which can reduce the weight of the pipe segment while ensuring the strength of the adjustment block 4.

[0127] The connecting block 3 also includes an upper wing-shaped connecting block 61 and a lower wing-shaped connecting block 62. The upper wing-shaped connecting block 61 and the lower wing-shaped connecting block 62 are applied to a large-span multi-hole shield tunnel. The large-span multi-hole shield tunnel includes multiple continuously arranged openings with a span of 14-30m, and adjacent openings of the tunnel are connected.

[0128] See attached Fig. 9 As shown, a load-bearing column 5 is provided between the upper wing-shaped connecting block 61 and the lower wing-shaped connecting block 62, the top of the load-bearing column 5 is plugged into the upper wing-shaped connecting block 61, and the bottom of the load-bearing column 5 is plugged into the lower wing-shaped connecting block 62. The upper wing-shaped connecting block 61, the lower wing-shaped connecting block 62 and the load-bearing column 5 constitute a connecting structure between adjacent openings, thereby realizing the connection between adjacent openings of multi-hole shield tunnels, increasing the overall span of the shield tunnel, thereby increasing the usable space of the underground tunnel, and helping to reduce urban population density and ease traffic pressure.

[0129] See attached Figure 7 As shown, the upper airfoil connection block 61 includes symmetrically arranged first connection blocks 31 and first connection beams 35 connected between the first connection blocks 31. The first connection beam 35 is a pentagonal structure, and second plug blocks 14 are respectively arranged on both sides of the top of the first connection beam 35, and first slots 15 are arranged on the sides where the first connection block 31 is connected to the first connection beam 35, and two first connection blocks 31 are respectively inserted on both sides of the first connection beam 35. Through the combination of the first connection block 31 and the first connection beam 35, the segment units of adjacent openings can be connected, thereby realizing the top connection of multi-hole shield tunnels, and then realizing the radial connection of multi-hole shield tunnels.

[0130] The length of the first connecting beam 35 is the length of two tube segment units, and two tube segment units can be plugged into each side of the first connecting beam 35 at the same time. The front end of the first connecting beam 35 is provided with a second slot 16, and the rear end of the first connecting beam 35 is provided with a third plug block 17. Two axially adjacent first connecting beams 35 are plugged in through the second slot 16 and the third plug block 17, which is convenient for connecting the axially adjacent upper airfoil connecting blocks 61, thereby improving assembly efficiency.

[0131] See attached Figure 8 As shown, the lower airfoil connection block 62 includes symmetrically arranged second connection blocks 32 and second connection beams 37 connected between the second connection blocks 32. The second connection beams 37 are in an inverted pentagonal structure, and second plug blocks 14 are respectively arranged on both sides of the bottom of the second connection beam 37, and first slots 15 are arranged on the side where the second connection block 32 is connected to the second connection beam 37, and two second connection blocks 32 are respectively inserted on both sides of the second connection beam 37. Through the combination of the second connection blocks 32 and the second connection beams 37, the segment units of adjacent openings can be connected, thereby realizing the bottom connection of the multi-hole shield tunnel, and then realizing the radial connection of the multi-hole shield tunnel.

[0132] The length of the second connecting beam 37 is the length of two tube segment units, and two tube segment units can be plugged in at the same time on each side of the second connecting beam 37. The circumferential connection side of the second connecting block 32 of the lower airfoil connecting block 62 is plugged in with the first standard block 21, the axial connection side of the second connecting block 32 is plugged in with the second standard block 22, and the circumferential connection side of the second standard block 22 is plugged in with the second connecting beam 37, so that the second connecting block 32, the first standard block 21 and the second standard block 22 are axially staggered, which enhances the interaction force between the tube segments, thereby improving the stability and anti-deformation ability of the overall structure.

[0133] A second slot 16 is provided at the front end of the second connecting beam 37, and a third plug-in block 17 is provided at the rear end of the second connecting beam 37. Two axially adjacent second connecting beams 37 are connected through the second slot 16 and the third plug-in block 17, which facilitates the connection of axially adjacent lower airfoil connecting blocks 62 and improves assembly efficiency.

[0134] The interior of the load-bearing column 5 is a hollow structure. The top of the second connecting beam 37 is provided with a second connecting piece 38 for connecting the load-bearing column 5. The second connecting piece 38 is a columnar structure. The interior of the second connecting piece 38 is a hollow structure. The bottom of the load-bearing column 5 is plugged with the second connecting piece 38. The shape of the second connecting piece 38 matches the load-bearing column 5. The bottom of the first connecting beam 35 is provided with a first connecting piece 36 for connecting the load-bearing column 5. The top front side of the load-bearing column 5 is provided with a mounting opening 51. The first connecting piece 36 is axially inserted into the mounting opening 51, so that the upper wing-shaped connecting block 61 can be plugged with the load-bearing column 5 along the axial direction, which is convenient for the installation of the tunnel top segment, thereby improving the assembly efficiency of the segment unit. The shape of the first connecting piece 36 matches the shape of the mounting opening 51. The load-bearing column 5 serves as a supporting structure for a tunnel shield tunnel, and improves the bearing capacity of a multi-hole shield tunnel.

[0135] The first connecting beam 35 and the second connecting beam 37 are both hollow structures and are made of ultra-high performance concrete (UHPC). The upper wing-shaped connecting block 61 and the lower wing-shaped connecting block 62 are made of ultra-high performance concrete (UHPC). The upper wing-shaped connecting block 61, the lower wing-shaped connecting block 62 and the load-bearing column 5 made of ultra-high performance concrete (UHPC) form a connection structure between multi-hole tunnels, so that the segment units can be assembled to form a large-span multi-hole shield tunnel. Without sacrificing the overall bearing capacity of the underground structure, the span is increased, thereby increasing the underground usable space, which helps to reduce the urban population density and relieve traffic pressure.

[0136] See attached Figure 1-8 As shown, the circumferentially connected sides of the standard block, the connecting block and the adjusting block 4 are all provided with second plug-in blocks 14 or first slots 15 , and two adjacent sides along the circumference of the tunnel are plugged in through the second plug-in blocks 14 and the first slots 15 .

[0137] The standard block, the connection block and the adjustment block 4 all include three structural forms: second plug-in blocks 14 are provided on both sides, first slots 15 are provided on both sides, and second plug-in blocks 14 are provided on one side and first slots 15 are provided on the other side, which can be selected according to the actual connection situation. For example, the two sides of the standard block with first slots 15 provided on both circumferential connection sides can be connected to the standard block with second plug-in blocks 14 provided on both circumferential connection sides, and the other circumferential connection side with second plug-in blocks 14 is connected to the connection block with first slots 15 on both sides, and so on.

[0138] The connection surfaces of the standard block, the connection block and the adjustment block 4 are all provided with waterproof strips, and the five sides of the first plug block are all provided with waterproof strips to improve the waterproof performance between the axially connected tube segment units. Waterproof strips are provided in the first slot 15 and on both sides of the second plug block 14, so that after the second plug block 14 is plugged into the first slot 15, a continuous waterproof layer can be formed on the connection surface to improve the waterproof performance between the circumferentially connected tube segment units.

[0139] The segment unit of the present invention is different from the traditional bolt connection method. It is connected by the cooperation of tenons and mortise heads without the use of bolts. This method reduces the dependence on fasteners such as bolts and avoids the problem of cracking and water seepage at the bolt holes. It not only reduces the construction difficulty, but also greatly improves the splicing speed of the segment unit, simplifies the construction process, and saves time and labor costs.

[0140] The segment units are connected by mortise and tenon structure, which can improve the assembly accuracy between the segments and avoid the misalignment and looseness problems that may occur during bolt connection, thus improving the overall stability and safety of the shield tunnel.

[0141] The mortise and tenon jointed segments form a close contact surface at the joints, extend the water flow path, reduce the possibility of water penetration, have stronger sealing, and enhance the waterproof ability of the segment structure. At the same time, it can be combined with waterproof measures such as double-channel waterproof stickers and waterproof sealing pads to provide double protection for tunnel leakage prevention. The shield segments connected by traditional bolts are prone to become channels for water seepage due to the presence of bolt holes, especially in complex geological conditions or after long-term operation, the problem of water leakage is more prominent. In actual engineering, this design can significantly reduce tunnel water leakage and improve the waterproof performance of the tunnel.

[0142] The mortise and tenon jointed segment units utilize the mortise and tenon structure to transfer and disperse the load and effectively limit the deformation of the segment connection parts in all directions, making the shield segments more uniform and stable when subjected to stress. This structure has a high joint stiffness and can provide greater shear resistance and bending stiffness, thereby improving the stress distribution on the joint surface and delaying the opening of the joint, which is beneficial to the overall stress of the structure and maintains the stability and safety of the tunnel.

[0143] The integrity of the traditional bolted segments is relatively weak, because the bolts are only connected at limited points. When the tunnel is locally subjected to large external forces, relative displacement between the segments is likely to occur, affecting the overall performance of the tunnel. The mortise and tenon jointed shield segments, due to their mutually nested mortise and tenon structure, improve the ringing accuracy and integrity, making the connection between the segments tighter and more continuous.

[0144] The mortise and tenon jointed segment units form an integral structure through the cooperation of the tenons and mortises, and the segments have strong collaborative working ability. This connection method improves the safety and durability of the shield tunnel and enhances the overall stability of the tunnel structure.

[0145] Since the mortise and tenon jointed segments have better waterproof performance and rigidity, there are fewer problems such as leakage and deformation during use. This can reduce the later maintenance costs and extend the service life of the shield tunnel.

[0146] Embodiment 2:

[0147] See attached Figure 10-16 As shown, as a preferred embodiment of the present invention, the present invention provides a method for installing a single-hole shield tunnel, the diameter of the single-hole tunnel is 11-14m, the tunnel body is a hole, and the installation method of the shield tunnel of embodiment 1 includes the following steps:

[0148] Step 1: Splice the first ring of annular segments 1 along the circumference of the single-hole tunnel. The splicing method of the annular segments 1 is as follows:

[0149] Step 1-1: insert three first standard blocks 21 continuously along the circumferential direction at the bottom of the single-hole tunnel;

[0150] Step 1-2: Insert a second connection block 32 along the circumferential direction on both sides of the first standard block 21;

[0151] Step 1-3: Insert a first connection block 31 on both sides of the second connection block 32 along the circumferential direction;

[0152] Step 1-4: inserting the adjustment block 4 axially between the two first connection blocks 31 to cap the annular segment 1;

[0153] Step 2: Splice the second ring of annular segments 1 along the circumferential direction of the single-hole tunnel. The method for splicing the second ring of annular segments 1 along the circumferential direction is as follows:

[0154] Step 2-1: insert three second standard blocks 22 at the front end of the first standard block 21 in step 1 in a staggered manner; insert a second standard block 22 at the front end of a first connecting block 31 and an adjusting block 4 in step 1;

[0155] Step 2-2: Insert a first connection block 31 on both sides of the second standard block 22 in step 2-1;

[0156] Step 2-3: inserting the adjustment block 4 axially between the first connection blocks 31 in step 2-2 to cap the annular segment 1;

[0157] Step 3: Repeat steps 1-2, and sequentially insert multiple annular segments 1 along the axial direction of the single-hole tunnel to form a single-hole shield tunnel.

[0158] Embodiment 3:

[0159] See attached Figure 17-24 As shown, as a preferred embodiment of the present invention, the present invention provides a method for installing a multi-hole shield tunnel, the span of the multi-hole tunnel is 14-30m, the tunnel body has a plurality of connected openings, and the installation method of the shield tunnel of embodiment 1 includes the following steps:

[0160] Step 1: Splice the first ring of annular segments 1 along the circumferential direction of the multi-hole tunnel. The splicing method of the annular segments 1 along the radial direction is as follows:

[0161] Step 1-1: a first standard block 21 is laid circumferentially at the bottom of the middle hole of the multi-hole tunnel, and two first standard blocks 21 are laid circumferentially at the bottom of the holes on both sides, and the first standard blocks 21 of adjacent holes are connected by the lower airfoil connection block 62;

[0162] Step 1-2: Insert the load-bearing column 5 on the top of the lower wing-shaped connecting block 62;

[0163] Step 1-3: inserting a third connection block 33 along the circumferential direction on both sides of the first standard block 21 at the two side openings;

[0164] Step 1-4: insert the upper airfoil connection block 61 axially into the top of the load-bearing column 5;

[0165] Step 1-5: inserting the adjustment block 4 axially between the third connection block 33 and the upper airfoil connection block 61 , and inserting the adjustment block 4 axially between the upper airfoil connection block 61 and the upper airfoil connection block 61 , so as to cap the annular segment 1 ;

[0166] Step 2: Splice the second ring of annular segments 1 along the circumferential direction of the multi-hole tunnel. The method of splicing the annular segments 1 along the circumferential direction is as follows:

[0167] Step 2-1: insert a second standard block 22 on both sides of the second connecting beam 37 of the lower airfoil connecting block 62 in step 1, and insert a second standard block 22 on the outside of the second standard block 22 at the openings on both sides;

[0168] Step 2-2: Insert a first connection block 31 on both sides of the second standard block 22 along the circumferential direction;

[0169] Step 2-3: insert a first connection block 31 on both sides of the first connection beam 35 of the upper airfoil connection block 61 of step 1 respectively;

[0170] Step 2-4: inserting the adjustment block 4 axially between the two first connection blocks 31 of each hole to cap the annular segment 1;

[0171] Step 3: Repeat steps 1-2, and sequentially insert multiple annular segments 1 along the axial direction of the multi-hole tunnel to form a multi-hole shield tunnel.

[0172] The above-mentioned axially adjacent segment units are connected by staggered assembly, and the side surface of the axial connection side is a continuous discount structure with protrusions and grooves. After the axially adjacent segment units are plugged in, the contact area and bite between the segment units can be increased, and the interaction force between the segment units is enhanced, thereby improving the stability and deformation resistance of the overall structure of the shield tunnel. This assembly method enables adjacent lining rings (annular segments 1) to have a bite effect through axial plugging, thereby making the single-point deformation of the staggered assembly less than that of the through-seam assembly, which has a significant effect on suppressing the deformation of the segment, especially when subjected to complex loads, the staggered assembly can more effectively maintain the integrity and function of the structure.

[0173] Furthermore, since the staggered assembly method reduces the deformation of the lining ring (annular segment 1), the gap at the joint is reduced, thereby improving the waterproof performance of the tunnel and reducing the risk of leakage. The annular segment 1 after staggered assembly has increased internal force, increased spatial rigidity, and reduced deformation. Smaller deformation means fewer cracks and gaps, reducing potential leakage points and improving the waterproof performance of the shield tunnel.

[0174] Furthermore, compared with the segment units assembled with through seams, the segment units assembled with staggered seams have a longitudinal reinforcement effect, which increases the maximum bending moment of the segment by about 13%, thus reflecting that the overall stiffness of the segment has been improved due to the reinforcement effect of the axial joint. This structural improvement enables the segment units to better disperse and transmit forces when subjected to stress, improves the overall stiffness and bearing capacity of the structure, especially when subjected to large bending moments, staggered assembly can provide more uniform force distribution and reduce local stress concentration.

[0175] Furthermore, due to its compactness and occlusal properties, the staggered joint assembly can more effectively limit the displacement of the segment unit in the horizontal direction and enhance the overall stability of the structure. The horizontal displacement under the staggered joint condition is reduced by about 8%, and the opening angle of the annular segment 1 at the joint is also reduced, indicating that the staggered joint is better than the through joint in terms of structural stress, deformation, and waterproofing, which is crucial to maintaining the stability of the tunnel and extending its service life.

[0176] The UHPC shield tunnel provided by the present invention includes a plurality of annular segments 1 continuously arranged along the axial direction of the tunnel. The annular segments 1 are spliced ​​end to end along the axial direction of the tunnel. The annular segments 1 include a plurality of arc-shaped segment units. The segment units are made of ultra-high performance concrete (UHPC), which enhances the overall strength of the structure and improves the bearing capacity. The segment units can be applied to large-span multi-hole tunnels. The excellent performance of ultra-high performance concrete (UHPC) materials enables the segments to have outstanding resistance to erosion and damage in the face of a variety of harsh environments. The UHPC segment units have excellent strength, durability, wear resistance, toughness, and enhanced resistance to erosion, freeze-thaw and penetration. They also have excellent explosion-proof and impact-proof properties, and can effectively cope with environmental challenges, thereby improving the safety and reliability of tunnel construction. It provides strong technical support for the safe construction of tunnels and other underground projects, ensuring the dual improvement of project quality and construction efficiency.

[0177] In terms of connection, the segment units adopt a hollow mortise and tenon structure design. The traditional bolt fixing method is abandoned between adjacent segment units. The staggered joint connection method significantly enhances the overall structural strength of the lining segment and prolongs its service life. Adjacent segments can fit tightly together, which improves the compactness and firmness of the structure and effectively resists external loads and vibrations. The mortise and tenon structure without bolts makes the gap between the segments smaller, improving the integrity and waterproof performance of the shield tunnel. It also facilitates the installation of the segments, improves construction efficiency, and simplifies the subsequent maintenance work.

[0178] The segment unit includes a standard block, a connecting block and an adjustment block 4, wherein the standard block and the connecting block can be inserted and fixed along the circumference of the tunnel, and the adjustment block is inserted to the top of the annular segment 1 along the axial direction of the tunnel for positioning and capping, which facilitates the assembly of the segment unit and improves the assembly efficiency of the segment unit.

[0179] By setting wing-shaped segments and load-bearing columns 5 to form a connection structure between multiple tunnels, a large-span multi-hole shield tunnel can be assembled. Without sacrificing the overall bearing capacity of the underground structure, the span is increased, thereby increasing the underground usable space, which helps to reduce the urban population density and ease traffic pressure.

[0180] The hollow structure inside the segment unit reduces the weight of the unit segment and enables the segment unit to be hoisted using standard mechanical equipment. Although the cost of ultra-high performance concrete (UHPC) is higher than that of ordinary concrete, the hollow structure design can keep the manufacturing cost at a level similar to that of traditional ordinary concrete solid shield segments, achieving a balance between material economy and performance superiority. Compared with ordinary prefabricated assembly structures, this lining structure has a lower reinforcement ratio, but still fully meets the seismic requirements. When the segment unit is damaged, the segment unit can be repaired by grouting into the cavity to restore its integrity, making it easier to maintain.

[0181] In the description of the present invention, it should be understood that 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0182] In the present invention, 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0183] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0184] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0185] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A UHPC shield tunnel, characterized in that: include: A plurality of annular segments (1) arranged continuously along the axial direction of the tunnel; The annular segment (1) comprises a plurality of arc-shaped segment units, the axial connection sides of the segment units are in the shape of a broken line, and the plurality of segment units are plugged in along the circumference of the tunnel to form the annular segment (1) whose axial connection sides are in the shape of a broken line; the angle between adjacent broken line segments is an obtuse angle; The fold line shape of the front side of the annular segment (1) matches the fold line shape of the rear side of the annular segment (1); a plurality of the annular segments (1) are staggered and spliced ​​in sequence; The segment unit is made of ultra-high performance concrete.

2. The UHPC shield tunnel according to claim 1, characterized in that: The front end of the tube segment unit is provided with a socket (11), the rear end of the tube segment unit is provided with a first plug-in block (12), and the socket (11) is plugged with the first plug-in block (12) at the rear end of the tube segment unit at the front end; A cavity (13) communicating with the socket (11) is provided inside the tube sheet unit.

3. The UHPC shield tunnel according to claim 2, characterized in that: The segment unit comprises: a standard block, a connection block and an adjustment block (4); The circumferential connection side of the standard block is in a straight line shape; The circumferential connection side of the connection block is in a straight line or a broken line shape; The standard block is plugged into the linear circumferential connection side of the connection block; The circumferential connection sides of the adjustment blocks (4) are all in the shape of a broken line, and the angles between the broken line segments are obtuse, so that the adjustment blocks (4) can be inserted axially between the connection blocks whose circumferential connection sides are in the shape of a broken line.

4. The UHPC shield tunnel according to claim 3, characterized in that: The standard block comprises a first standard block (21) and a second standard block (22); The first standard block (21) and the second standard block (22) each comprise four standard segments (23) arranged in series, the first standard segment (23) and the second standard segment (23) being staggeredly connected via an inclined segment (24), and the third standard segment (23) and the fourth standard segment (23) being staggeredly connected via the inclined segment (24); The second standard section (23) and the third standard section (23) of the first standard block (21) protrude forward from the first standard section (23) and the fourth standard section (23); The second standard section (23) and the third standard section (23) of the second standard block (22) protrude rearwardly from the first standard section (23) and the fourth standard section (23); The angle between the inclined section (24) and the standard section (23) is an obtuse angle.

5. The UHPC shield tunnel according to claim 3, characterized in that: The connection block comprises a first connection block (31), a second connection block (32) and a third connection block (33); The first connecting block (31) comprises two standard sections (23) and a connecting section (34) which are arranged continuously, wherein the first standard section (23) is staggeredly connected to the second standard section (23) via an inclined section (24); the circumferential connecting side of the first standard section (23) is in a straight line shape, and the circumferential connecting side of the connecting section (34) is in a broken line shape; The second connection block (32) comprises two standard sections (23) arranged continuously, the first standard section (23) and the second standard section (23) being staggered and connected via an inclined section (24); the circumferential connection sides of the second connection block (32) are all straight lines; The third connecting block (33) comprises a connecting section (34) and four standard sections (23) which are arranged continuously, the second standard section (23) and the third standard section (23) are staggeredly connected via an inclined section (24), and the fourth standard section (23) and the fifth standard section (23) are staggeredly connected via an inclined section (24), so that the third standard section (23) and the fourth standard section (23) protrude from the first connecting section (34), the second standard section (23) and the fifth standard section (23); The angle between the inclined section (24) and the connecting section (34) is an obtuse angle.

6. The UHPC shield tunnel according to claim 3, characterized in that: The connection block further comprises an upper airfoil connection block (61), wherein the upper airfoil connection block (61) comprises symmetrically arranged first connection blocks (31) and a first connection beam (35) connected between the first connection blocks (31); The first connecting beam (35) is in a pentagonal structure, and second plug-in blocks (14) are respectively provided on both sides of the top of the first connecting beam (35), and a first slot (15) is provided on the side where the first connecting block (31) is connected to the first connecting beam (35), and two first connecting blocks (31) are respectively plugged into both sides of the top of the first connecting beam (35); A first connecting member (36) for connecting to a load-bearing column (5) is provided at the bottom of the first connecting beam (35).

7. The UHPC shield tunnel according to claim 3, characterized in that: The connection block further comprises a lower airfoil connection block (62), wherein the lower airfoil connection block (62) comprises symmetrically arranged second connection blocks (32) and a second connection beam (37) connected between the second connection blocks (32); The second connecting beam (37) is in an inverted pentagonal structure, and second plug blocks (14) are respectively provided on both sides of the bottom of the second connecting beam (37), and a first slot (15) is provided on the side where the second connecting block (32) is connected to the second connecting beam (37), and two second connecting blocks (32) are respectively plugged into the two sides of the bottom of the second connecting beam (37); A second connecting member (38) for connecting to a load-bearing column (5) is provided at the top of the second connecting beam (37).

8. A method for installing a single-hole shield tunnel, using the UHPC shield tunnel according to any one of claims 1 to 7, the installation method comprising the following steps: Step 1: splicing the first circle of annular segments (1) along the circumferential direction of the single-hole tunnel. The splicing method of the first circle of annular segments (1) is as follows: Step 1-1: inserting three first standard blocks (21) continuously along the circumferential direction at the bottom of a single-hole tunnel; Step 1-2: inserting a second connection block (32) along the circumferential direction on both sides of the first standard block (21); Step 1-3: inserting a first connection block (31) on both sides of the second connection block (32) along the circumferential direction; Step 1-4: inserting an adjustment block (4) between the two first connection blocks (31) along the axial direction to cap the annular segment (1); Step 2: splicing the second ring of annular segments (1) along the circumferential direction of the single-hole tunnel. The splicing method of the second ring of annular segments (1) is as follows: Step 2-1: insert three second standard blocks (22) at the front end of the first standard block (21) in step 1 in a staggered manner; insert one second standard block (22) at the front end of one of the first connecting blocks (31) and the adjusting block (4) in step 1; Step 2-2: Connecting one of the first connection blocks (31) to both sides of the second standard block (22) in step 2-1 respectively; Step 2-3: inserting an adjustment block (4) axially between the first connection blocks (31) in step 2-2 to cap the annular segment (1); Step 3: Repeat steps 1-2, and sequentially insert a plurality of the annular segments (1) along the axial direction of the single-hole tunnel to form a single-hole shield tunnel.

9. A method for installing a multi-hole shield tunnel, using the UHPC shield tunnel according to any one of claims 1 to 7, the installation method comprising the following steps: Step 1: Splicing the first ring of annular segments (1) along the circumferential direction of the multi-hole tunnel. The method of splicing the annular segments (1) along the radial direction is as follows: Step 1-1: laying a first standard block (21) along the circumferential direction at the bottom of the middle hole of the multi-hole tunnel, laying two first standard blocks (21) along the circumferential direction at the bottom of the holes on both sides, and connecting the first standard blocks (21) of adjacent holes through lower airfoil connection blocks (62); Step 1-2: Inserting a load-bearing column (5) on the top of the lower wing-shaped connecting block (62); Step 1-3: inserting a third connection block (33) along the circumferential direction on both sides of the first standard block (21) at the openings on both sides; Step 1-4: inserting an upper wing-shaped connecting block (61) axially at the top of the load-bearing column (5); Step 1-5: inserting an adjustment block (4) axially between the third connection block (33) and the upper airfoil connection block (61), and inserting an adjustment block (4) axially between the upper airfoil connection block (61) and the upper airfoil connection block (61), so as to cap the annular segment (1).

10. The installation method of a multi-hole shield tunnel according to claim 9, characterized in that: Also includes: Step 2: Splicing the second ring of annular segments (1) along the circumferential direction of the multi-hole tunnel. The method of splicing the annular segments (1) along the circumferential direction is as follows: Step 2-1: inserting a second standard block (22) on both sides of the second connection beam (37) of the lower airfoil connection block (62) in step 1, and inserting a second standard block (22) on the outside of the second standard block (22) at the openings on both sides; Step 2-2: inserting a first connection block (31) along the circumferential direction on both sides of the second standard block (22) in step 2-1; Step 2-3: inserting a first connection block (31) on both sides of the first connection beam (35) of the upper airfoil connection block (61) in step 1 respectively; Step 2-4: inserting an adjustment block (4) axially between the two first connection blocks (31) of each hole to cap the annular segment (1); Step 3: Repeat steps 1-2, and sequentially insert a plurality of the annular segments (1) along the axial direction of the multi-hole tunnel to form a multi-hole shield tunnel.

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