Corner-collapse-preventing duct piece, duct piece ring and manufacturing method

Abstract

The invention discloses a corner-chipping-preventing duct piece, a duct piece ring and a manufacturing method, and the corner-chipping-preventing duct piece comprises a fiber concrete structural body, a framework body, a protection piece and a connecting piece; the framework body is arranged in the fiber concrete structural body; the connecting pieces are arranged on the protection pieces, the protection pieces are connected with the framework body, the connecting pieces are embedded in the fiber concrete structural body, and the protection pieces are located at the corners of the fiber concrete structural body and used for preventing the corners from being chipped. The anti-corner-chipping duct piece can be produced in a prefabricated mode in a factory so that on-site rapid construction can be achieved, and the problems that in the shield tunnel construction process, corner damage, cracking and chipping often happen to the duct piece can be solved. According to the novel segment ring, the overall stability of the segment ring can be better improved. According to the manufacturing method of the anti-corner-collapse duct piece, people can be scientifically guided to produce the novel duct piece, and the manufacturing quality of the novel duct piece is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe segments, and in particular relates to a pipe segment and a pipe segment ring for preventing corner collapse, and a manufacturing method thereof. Background Art

[0002] Shield tunnels are commonly found in underground projects such as subway tunnels, intercity railway tunnels and highway tunnels. They are a type of tunnel structure that uses fully mechanized construction with shield machines. Unlike traditional mining tunnels, shield tunnels do not require blasting and manual excavation, but instead use cutting devices to excavate the soil. In addition, shield tunnels use a "tunneling while assembling segments" construction method to form a stable tunnel structure. There is no need to carry out multiple processes such as primary lining, formwork erection, steel bar tying and secondary lining pouring in mining tunnels, making the construction process more efficient and safer.

[0003] Although shield tunneling has significant advantages such as high construction efficiency and safety, the corners of the segments are often damaged, cracked, and falling off during on-site assembly. The main reason for the damage to the corners of the segments is that during the design process, the segments are tightly fitted to each other, and the corners of the segment joints are usually only a few millimeters apart. However, during the segment assembly process, there are several influencing factors:

[0004] (1) Segment manufacturing errors: Errors in the prefabrication process at the segment factory can cause changes in segment size and shape;

[0005] (2) Shield machine excavation assembly error: The assembly error of the shield machine inside the shield machine is due to the accuracy of the instrument. The shield machine may sink or float in the stratum during the excavation process. In addition, under the action of external "water and soil pressure", the shield shell will undergo slight deformation, causing the shield machine to ellipse, which will further increase the error of the assembly system.

[0006] (3) Tunnel displacement and deformation: During and after segment assembly, the tunnel may experience slight displacement and deformation due to its own gravity and external forces.

[0007] (4) Slight deformation caused by thermal expansion and contraction of the tube segment;

[0008] Under the influence of the above four factors, during the segment ring assembly process, the gap between the segments tends to become smaller, and after the gap disappears, bumps, friction, stress concentration, etc. occur at the corners of the segments, causing the concrete structure at the corners of the segments to break, crack, and fall off. The breakage, cracking, and falling of the corners of the segments may damage the appearance of the concrete segments (affecting the appearance), or even cause partial structural damage, damage to the joint waterproofing system, reduced bearing capacity, and cause more serious accidents.

[0009] At present, there is an urgent need to develop a new type of anti-corner collapse segment to solve the problems of corner damage, cracking and falling of segments that often occur during shield tunnel construction. At present, there is also a lack of a new type of segment ring with anti-corner collapse segments to better improve the overall stability of the segment ring; there is also a lack of a method for making anti-corner collapse segments to scientifically guide people to produce new segments and ensure the production quality of new segments.

[0010] Therefore, a new technology is needed to solve the problem that the existing technology lacks a new type of anti-corner collapse segment; a new technology is needed to solve the problem that the existing technology lacks a new type of segment ring with anti-corner collapse segment; a new technology is needed to solve the problem that the existing technology lacks a method for manufacturing an anti-corner collapse segment. Summary of the invention

[0011] In order to solve the above problems in the prior art, the present invention provides a pipe segment with an anti-corner collapse function, which can solve the problems of corner damage, cracking and falling of pipe segments that often occur during shield tunnel construction.

[0012] The present invention adopts the following technical solutions:

[0013] A pipe segment for preventing corner collapse comprises a fiber concrete structure, a skeleton, a protective member and a connecting member; the skeleton is arranged in the fiber concrete structure; the connecting member is arranged on the protective member, the protective member is connected to the skeleton, the connecting member is embedded in the fiber concrete structure, and the protective member is located at the corner of the fiber concrete structure to prevent corner collapse.

[0014] Furthermore, the fiber concrete structure is an arc-shaped structure; the fiber concrete structure is cast by fiber concrete; the fiber concrete includes steel fibers and concrete, the steel fibers are added to the concrete, and the steel fibers are long straight steel fibers with circular cross-sections.

[0015] Furthermore, in the unit volume of the fiber concrete, the volume of the steel fiber accounts for 1.0% to 1.5% of the total volume.

[0016] Furthermore, the steel fiber has a length of 20 mm to 50 mm, a diameter of 0.3 mm to 0.75 mm, and an aspect ratio of 30 to 80.

[0017] Furthermore, one end of the connecting member is connected to a surface of the protective member, and a connecting point is provided at the connecting position where the connecting member and the protective member are connected. After the connecting member and the protective member are both arranged on the fiber concrete structure, the normal of the fiber concrete structure at the connecting point forms a set angle with the central axis of the connecting member; the angle is 0° to 45°.

[0018] Furthermore, the skeleton body includes segment main body steel bars and segment corner steel bars; the segment main body steel bars are connected to the segment corner steel bars; the segment main body steel bars and the segment corner steel bars are both arranged in the fiber concrete structure; the protective piece is connected to the segment corner steel bars, and the connecting piece is staggered with the segment corner steel bars and embedded in the fiber concrete structure.

[0019] Furthermore, the protective member is a quadrilateral steel plate; the yield strength of the protective member is at least 235 MPa; and the thickness of the protective member is at least 10 mm.

[0020] Furthermore, the connecting member is a bolt; the connecting member has a diameter of at least 10 mm.

[0021] Another object of the present invention is to provide a segment ring to better improve the overall stability of the segment ring.

[0022] A segment ring is composed of a plurality of segments, and the segment ring includes at least one segment for preventing corner collapse.

[0023] Another object of the present invention is to provide a method for manufacturing an anti-collapse corner segment to scientifically guide people to produce new types of segments and ensure the manufacturing quality of the new types of segments.

[0024] A method for manufacturing an anti-corner collapse segment is used to manufacture the above-mentioned anti-corner collapse segment, which comprises the following manufacturing steps:

[0025] S1, making the skeleton;

[0026] Making the protective member, and welding and fixing the connecting member on the protective member;

[0027] Making fiber concrete;

[0028] S2, welding and fixing the protective member to the steel bars at the corners of the pipe segments of the frame body;

[0029] S3, installing the combined structure formed by the frame body, the protective member and the connecting member in a segment mold;

[0030] S4, pouring the prepared fiber concrete into the segment mold, so that the fiber concrete is fully bonded to the frame body, the protective member, and the connecting member; wherein, after the fiber concrete solidifies, the fiber concrete structure is formed;

[0031] S5. Maintenance.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The pipe segment for preventing corner collapse of the present invention can be prefabricated in a factory to realize rapid construction on site; wherein, the pipe segment of the present invention, its protective piece is connected to the fiber concrete structure through a connecting piece, and the protective piece itself is also connected to the skeleton, has a high connection strength, and can be well combined into an integral load-bearing member; after the pipe segment is integrally manufactured, the protective piece is located at the corner of the fiber concrete structure, and plays a protective role for the corner of the fiber concrete structure, even if the corner of the pipe segment collides during construction, it will not be damaged, cracked or fall off; the main body of the pipe segment of the present invention is a fiber concrete structure (cast by fiber concrete), has higher tensile strength, toughness and impact strength, and has better load-bearing performance in the process of coordinated force with the protective piece at the corner.

[0034] The protective member of the present invention is preferably a steel plate. When protecting, the high toughness of the steel plate can be fully utilized to protect the corners of the fiber concrete structure; at the same time, when the protective member of the present invention is preferably a steel plate, it can create conditions for the subsequent further processing and transformation of the tunnel. For example, after the segment assembly is completed, if necessary, the protective members of two adjacent segments in the segment ring can be welded together to improve the integrity of the tunnel and the sealing of the joints; or, the structure to be added can be welded to the protective member to expand the auxiliary functions of the segment ring; when the protective member of the present invention is preferably a steel plate, the steel structure can be processed directly on the protective member, and the installation of the structure is convenient and quick.

[0035] The segment ring of the present invention has a segment with anti-corner collapse, which can effectively avoid corner damage, cracking and chipping problems caused by factors such as bumps during the segment ring assembly process, improve the molding quality of the segment ring, and is beneficial to ensuring the waterproof ability and bearing capacity of the joints between the segments in the segment ring, thereby improving the overall stability of the segment ring.

[0036] The method for manufacturing an anti-collapse corner segment of the present invention is specially designed for a new type of segment, and can scientifically guide people to produce the new type of segment and ensure the manufacturing quality of the new type of segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0038] Figure 1 is a schematic elevation view of a first embodiment of the novel pipe segment of the present invention;

[0039] Figure 2 yes Figure 1 A partial schematic diagram of the new segment at the corner;

[0040] Figure 3 yes Figure 1 Bottom view of

[0041] Figure 4 yes Figure 3 A schematic diagram of a protective member in FIG.

[0042] Figure 5 yes Figure 4 Right view of;

[0043] Figure 6 yes Figure 4 A cross-sectional view at VV;

[0044] Figure 7 yes Figure 1 Connection diagram between the middle frame and the protective parts (elevation view);

[0045] Figure 8 yes Figure 7 A partial enlarged view at the corner;

[0046] Fig. 9 yes Figure 1 Layout drawing of the middle frame (bottom view);

[0047] Fig.10 is a schematic elevation view of a second embodiment of the novel pipe segment of the present invention;

[0048] Fig.11 yes Fig.10 A partial enlarged view at the corner;

[0049] Fig.12 yes Fig.10 A schematic diagram showing a recess in which a protective member is hidden;

[0050] Fig.13 yes Fig.10 Bottom view of

[0051] Fig.14 yes Fig.13 A schematic diagram of a protective member in FIG.

[0052] Fig.15 yes Fig.14 Right view of;

[0053] Fig.16 yes Fig.14 A cross-sectional view at VV;

[0054] Fig.17 yes Fig.10 Connection diagram between the middle frame and the protective parts (elevation view);

[0055] Fig.18 yes Fig.10 Layout drawing of the middle frame (bottom view);

[0056] Fig.19is a schematic diagram of a first embodiment of a segment ring of the present invention;

[0057] Fig. 20 is a schematic diagram of a second embodiment of a segment ring of the present invention;

[0058] Fig.21 It is a schematic diagram of a third embodiment of a segment ring of the present invention.

[0059] Reference numerals:

[0060] 1-segment; 11-fiber concrete structure; 111-bolt hole; 112-bolt hand hole; 113-groove; 114-grouting and lifting hole; E-normal line; Y-edge; 12-frame body; 13-protective part; Q-center axis; R-long side; T-length; X-exposed surface; Z-width; 14-connector; F-center axis; G-angle; H-angle; K-distance; L-distance; M-joint edge; N-width direction; W-width: P-gap; J-length; U-section line symbol; V-section symbol;

[0061] 2-main steel bars of the segment; 21-longitudinal arc steel bars; 22-stirrups;

[0062] 3-segment corner reinforcement; 31-lap joint;

[0063] 4-segment ring;

[0064] 51-standard block segment; 52-adjacent block segment; 53-capping block segment;

[0065] 61-standard block segment; 62-adjacent block segment; 63-capping block segment;

[0066] 71-standard block segment; 72-adjacent block segment; 73-capping block segment. DETAILED DESCRIPTION

[0067] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0068] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0069] Reference Figures 1 to 9 (or Figures 10 to 18 ), a pipe segment 1 for preventing corner collapse, comprising a fiber concrete structure 11, a skeleton 12, a protective member 13 and a connecting member 14; the skeleton 12 is arranged in the fiber concrete structure 11; the connecting member 14 is arranged on the protective member 13, the protective member 13 is connected to the skeleton 12, the connecting member 14 is embedded in the fiber concrete structure 11, and the protective member 13 is located at the corner of the fiber concrete structure 11, for preventing corner collapse.

[0070] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the fiber concrete structure 11 is an arc-shaped structure; the fiber concrete structure 11 is cast by fiber concrete; the fiber concrete includes steel fibers and concrete, the steel fibers are added to the concrete, and the steel fibers are long straight steel fibers with round cross-sections. The concrete strength grade is C45 to C55.

[0071] In one embodiment, in a unit volume of the fiber concrete, the volume of the steel fiber accounts for 1.0% to 1.5% of the total volume (ie, the volume ratio of the steel fiber is 1.0% to 1.5%).

[0072] In one embodiment, the steel fiber has a length of 20 mm to 50 mm, a diameter of 0.3 mm to 0.75 mm, and an aspect ratio of 30 to 80. For example, if the steel fiber has a length of 30 mm, a diameter of 0.4 mm, and an aspect ratio of 75, it meets the use requirements; if the steel fiber has a length of 40 mm, a diameter of 0.6 mm, and an aspect ratio of 66.7, it meets the use requirements; and if the steel fiber has a length of 50 mm, a diameter of 0.5 mm, and an aspect ratio of 100 (exceeding 30 to 80), it does not meet the use requirements. The pipe segment of the present invention is made of fiber concrete, which has higher tensile strength, toughness and impact strength than traditional pipe segments, and can better maintain integrity when the pipe segment is hit and collided.

[0073] Reference Figures 10 to 18In one embodiment, one end of the connector 14 is connected to a surface of the protective member 13, and a connection point is provided at the connection position where the connector 14 and the protective member 13 are connected. After the connector 14 and the protective member 13 are arranged on the fiber concrete structure 11, the normal E of the fiber concrete structure 11 at the connection point forms a set angle G with the central axis F of the connector 14; the angle G is 0° to 45°. Among them, the angle H at which the connector 14 is fixed to the protective member 13 can be adjusted in advance according to the actual curvature of the prefabricated segment to ensure that the connector 14 and the fiber concrete structure 11 have better connection performance after the segment is manufactured. Refer to Fig.11 , where the sum of the angle G and the angle H is 90°.

[0074] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the skeleton body 12 includes segment main steel bars 2 and segment corner steel bars 3; the segment main steel bars 2 are connected to the segment corner steel bars 3; the segment main steel bars 2 and the segment corner steel bars 3 are both arranged in the fiber concrete structure 11; the protective member 13 is connected to the segment corner steel bars 3, and the connecting member 14 is staggered from the segment corner steel bars 3 and embedded in the fiber concrete structure 11.

[0075] Preferably, the connecting members 14 are also staggered with the segment main body steel bars 2 .

[0076] Reference Figures 1 to 9 (or Figures 10 to 18 ), preferably, the fiber concrete structure 11 further has a bolt hole 111 and a bolt hand hole 112, and the connecting member 14 is also staggered from the bolt hole 111 and the bolt hand hole 112. The connecting member 14 is staggered from the bolt hole 111 and maintains a distance K of at least 50 mm from the bolt hole 111.

[0077] Reference Figures 1 to 9 (or Figures 10 to 18 ), preferably, after “the connecting member 14 and the protecting member 13” are combined with the fiber concrete structure 11, the distance between the connecting member 14 and the joint edge M of the fiber concrete structure 11 is not less than 50 mm (can be 50 mm).

[0078] Reference Figures 1 to 9 (or Figures 10 to 18 ), preferably, the protective member 13 is staggered from the position of the bolt hand hole 112 and maintains a distance L of at least 100 mm from the bolt hand hole 112.

[0079] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the segment corner steel bars 3 are evenly arranged at several locations along the width direction N of the fiber concrete structure 11. In this embodiment, the segment corner steel bars 3 are arranged at four or six locations.

[0080] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the guard 13 is fixed to the segment corner steel bar 3 by welding, the welding is fixed by full welding, the weld grade is level 1, and the weld quality is verified by level II flaw detection after welding. Before the guard 13 is fixed to the segment corner steel bar 3 by welding, a gap P of 10 mm is required between the guard 13 and the segment corner steel bar 3 to stabilize the position of the guard 13 and ensure the quality of welding.

[0081] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the segment main steel bar 2 is composed of a plurality of longitudinal arc steel bars 21 and a plurality of stirrups 22; the segment corner steel bars 3 are only arranged at the two ends of the fiber concrete structure 11, and the segment corner steel bars 3 have a lap joint 31 connected to the protective member 13; preferably, the segment corner steel bars 3 are formed by bending steel bars and have a lap joint 31.

[0082] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the protective member 13 is a quadrilateral steel plate; the yield strength of the protective member 13 is at least 235Mpa; the thickness of the protective member 13 is at least 10mm. In this embodiment, the protective member 13 is a steel material of Q235B. Preferably, a plurality of connecting members 14 are evenly arranged on the protective member 13, and the connecting members 14 are arranged on the central axis Q of the protective member 13, and the central axis Q is parallel to the long side R of the protective member 13.

[0083] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the length T of the protective member 13 is consistent with the width W of the fiber concrete structure 11; when the protective member 13 is fixed to the fiber concrete structure 11, the exposed surface X of the protective member 13 is flush with the edge Y of the fiber concrete structure 11.

[0084] The size of the protective member 13 can be adjusted according to actual conditions. In one embodiment, the protective member 13 preferably has a thickness of 10 mm, a width Z of 90 mm, and a length T that is consistent with the width W of the fiber concrete structure 11 .

[0085] Reference Figures 1 to 9 (or Figures 10 to 18), in one embodiment, the connecting member 14 is a stud; preferably, the stud is a 6.8 grade steel bolt. The diameter of the connecting member 14 is at least 10 mm, and the length J of the connecting member 14 is at least 80 mm.

[0086] Reference Fig.12 In one embodiment, the fiber concrete structure 11 obtained after casting has a groove 113, and the groove 113 perfectly matches the engagement of the protective member 13, so that the present invention does not need to make special modifications to the segment mold, and can use the original segment mold to produce new segments, which helps to control production costs.

[0087] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the fiber concrete structure 11 also has a grouting hole 114 which also serves as a lifting hole.

[0088] Reference Figures 1 to 9 In one embodiment, the fiber concrete structure 11 has two corners, one of which is provided with a combined structure of "the protective member 13 and the connecting member 14".

[0089] Reference Figures 10 to 18 In another embodiment, the fiber concrete structure 11 has two corners, and both corners are provided with a combination structure of "the protective member 13 and the connecting member 14".

[0090] Another object of the present invention is to provide a segment ring to better improve the overall stability of the segment ring.

[0091] Reference Fig.19 (or refer to Fig. 20 )(or refer to Fig.21 ), a segment ring 4 is composed of a plurality of segments, and the segment ring 4 includes at least one segment for preventing corner collapse.

[0092] Reference Fig.19 In one embodiment, the segment ring 4 is composed of five segments, including two standard segments 51, two adjacent segments 52 and one capping segment 53, wherein the capping segment 53 is a new segment newly developed by the present invention, and both corners thereof are provided with a combination structure of "the protective member 13 and the connecting member", which has the lowest cost and can protect the safety of the two corners of the capping segment 53 assembled last. The segment assembly sequence is "assemble the standard segment 51 first, then assemble the adjacent segment 52, and finally assemble the capping segment 53".

[0093] Reference Fig. 20In the second embodiment, the segment ring 4 is composed of five segments, including two standard segment blocks 61, two adjacent segment blocks 62 and one capping segment block 63; wherein the "adjacent segment block 62" and the "capping segment block 63" are both new segments newly developed by the present invention; on one side where the "adjacent segment block 62" is assembled and connected with the capping segment block 63, the corner of the adjacent segment block 62 is provided with a combination structure of "the protective member 13 and the connecting member"; and the corners of both sides of the capping segment block 63 are provided with a combination structure of "the protective member 13 and the connecting member". Because the assembly sequence of the segments is "first assemble the standard block segment 61, then assemble the adjacent block segment 62, and finally assemble the capping block segment 63", the assembly space of the standard block segment 61 is larger and the risk of collision is lower, so there is no need to set the combination structure of "the protective member 13 and the connecting member" at the corner. However, the last assembled capping block segment 63 has a small assembly space, a large error, and a high risk of collision. Therefore, on one side where the "adjacent block segment 62" is assembled with the capping block segment 63, a combination structure of "the protective member 13 and the connecting member" is set at the corner of the adjacent block segment 62, and a combination structure of "the protective member 13 and the connecting member" is set at the corners on both sides of the capping block segment 63, so that the assembly quality of the segment ring 4 can be guaranteed to the greatest extent at a relatively low cost.

[0094] Reference Fig.21 In the third embodiment, the segment ring 4 is composed of five segments, including two standard segment blocks 71, two adjacent segment blocks 72 and one capping segment block 73, wherein the standard segment blocks 71, the adjacent segment blocks 72 and the capping segment block 73 are all new segments newly developed by the present invention, wherein each standard segment block 71, each adjacent segment block 72 and each capping segment block 73, the corners on both sides of each segment are provided with a combination structure of "the protective member 13 and the connecting member", which can ensure the assembly quality of the entire segment ring 4.

[0095] Another object of the present invention is to provide a method for manufacturing an anti-collapse corner segment to scientifically guide people to produce new types of segments and ensure the manufacturing quality of the new types of segments.

[0096] Reference Figures 1 to 9 (or Figures 10 to 18 ), a method for manufacturing an anti-corner collapse segment, used for manufacturing the above-mentioned anti-corner collapse segment 1, comprising the following manufacturing steps:

[0097] S1, making the skeleton 12;

[0098] Making the protective member 13, and welding and fixing the connecting member 14 on the protective member 13;

[0099] Making fiber concrete;

[0100] S2, welding and fixing the protective member 13 and the steel bars 3 at the corners of the pipe segments of the frame body 12 together;

[0101] S3, installing the combined structure formed by the frame body 12, the protective member 13, and the connecting member 14 in a segment mold;

[0102] S4, pouring the prepared fiber concrete into the segment mold, so that the fiber concrete is fully bonded to the frame body 12, the protective member 13, and the connecting member 14; wherein, after the fiber concrete solidifies, the fiber concrete structure 11 is formed; wherein, the connecting member 14 is embedded in the fiber concrete structure 11, and the coordinated force between the protective member 13 and the fiber concrete structure 11 can be enhanced;

[0103] S5. Maintenance.

[0104] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the step of "making the skeleton 12" in the step S1 includes the following steps:

[0105] A1. Make the main steel bars of the segment 2;

[0106] Making the steel bars at the corners of the pipe segments 3;

[0107] A2. Connect the segment main body steel bars 2 and the segment corner steel bars 3 together to form the skeleton body 12.

[0108] Reference Figures 10 to 18 In one embodiment, in the step S1, the step of "making the protective member 13 and welding the connecting member 14 to the protective member 13" includes the following steps:

[0109] B1. Cut out the protective member 13 of a qualified shape; if the protective member 13 is a (plane) quadrilateral steel plate, it is necessary to cut out a quadrilateral of a qualified shape;

[0110] B2. Place the connecting member 14 on the protective member 13 and control the angle H between the connecting member 14 and the plane on the protective member 13;

[0111] B3. After the angle H is adjusted to the design value, the connecting member 14 and the protective member 13 are welded and fixed;

[0112] B4. Weld quality inspection; if the weld quality inspection is qualified, the structure composed of "the connecting member 14 and the protective member 13" can be used to connect with the frame body 12; if the weld quality inspection is unqualified, the structure composed of "the connecting member 14 and the protective member 13" needs to be re-welded until the weld quality inspection is qualified before it can be used;

[0113] B5. Complete the weld quality inspection and obtain a qualified "connecting part 14 and protective part 13" combination structure.

[0114] In one embodiment, the step of "making fiber concrete" in step S1 includes the following steps:

[0115] C1. Use silicate cement as concrete admixture, and the strength grade of silicate cement should not be less than 42.5;

[0116] C2. Mix cement to prepare concrete. During the cement mixing process, add steel fiber to finally prepare fiber concrete.

[0117] Reference Figures 1 to 9 (or Figures 10 to 18 ), in one embodiment, the S2 step includes the following specific steps:

[0118] S21, maintaining a gap P of 10 mm between the protective member 13 and the steel bars 3 at the corners of the segments of the framework 12;

[0119] S22, welding; the welding adopts the form of full welding, which can effectively ensure the coordinated force between the protective member 13 and the steel bars 3 at the corner of the segment 1 after the segment 1 is formed;

[0120] S23. Finally, the protective member 13 and the steel bars 3 at the corners of the pipe segments are fixed together.

[0121] In one embodiment, a step S2.5 is further included between the step S2 and the step S3, and the step S2.5 includes the following steps:

[0122] S2.5. Check the weld quality of the joints between the protective member 13 and the steel bars 3 at the corners of the pipe segments by using level II nondestructive testing.

[0123] In one embodiment, the manufactured new pipe segments are transported to the construction site. During the on-site construction, the new pipe segments are assembled to the set positions by the pipe segment assembly system of the shield machine, and the tunnel construction of the pipe segment ring 4 is finally completed (refer to Fig.19 or Fig. 20 or Fig.21 If there is a need to expand the auxiliary functions of the segment ring 4 in the future, conventional steel structure processing can be directly performed on the protective member 13.

[0124] For other contents of the anti-corner collapse segment, segment ring and manufacturing method described in the present invention, please refer to the prior art and will not be repeated here.

[0125] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A pipe segment for preventing corner collapse, characterized in that: It includes a fiber concrete structure, a frame body, a protective member and a connecting member; the frame body is arranged in the fiber concrete structure; the connecting member is arranged on the protective member, the protective member is connected to the frame body, the connecting member is embedded in the fiber concrete structure, and the protective member is located at the corner of the fiber concrete structure to prevent the corner from collapsing.

2. The anti-corner collapse segment according to claim 1, characterized in that: The fiber concrete structure is an arc-shaped structure; the fiber concrete structure is cast by fiber concrete; the fiber concrete includes steel fibers and concrete, the steel fibers are added to the concrete, and the steel fibers are long straight steel fibers with circular cross-sections.

3. The anti-corner collapse segment according to claim 2, characterized in that: In the unit volume of the fiber concrete, the volume of the steel fiber accounts for 1.0% to 1.5% of the total volume.

4. The anti-corner collapse segment according to claim 2, characterized in that: The steel fiber has a length of 20 mm to 50 mm, a diameter of 0.3 mm to 0.75 mm, and an aspect ratio of 30 to 80.

5. The anti-corner collapse segment according to claim 2, characterized in that: One end of the connecting member is connected to a surface of the protective member. It is assumed that there is a connecting point at the connecting position where the connecting member and the protective member are connected. After the connecting member and the protective member are both arranged on the fiber concrete structure, the normal of the fiber concrete structure at the connecting point forms a set angle with the central axis of the connecting member; the angle is 0° to 45°.

6. The anti-corner collapse segment according to claim 1, characterized in that: The skeleton body includes segment main steel bars and segment corner steel bars; the segment main steel bars are connected with the segment corner steel bars; the segment main steel bars and the segment corner steel bars are both arranged in the fiber concrete structure; the protective piece is connected with the segment corner steel bars, and the connecting piece is staggered with the segment corner steel bars and embedded in the fiber concrete structure.

7. A pipe segment for preventing corner collapse according to any one of claims 1 to 6, characterized in that: The protective member is a quadrilateral steel plate; the yield strength of the protective member is at least 235 MPa; and the thickness of the protective member is at least 10 mm.

8. The anti-corner collapse segment according to claim 7, characterized in that: The connecting piece is a bolt; the diameter of the connecting piece is at least 10 mm.

9. A segment ring, characterized in that: The segment ring is composed of a plurality of segments, and the segment ring includes at least one segment for preventing corner collapse according to any one of claims 1 to 8.

10. A method for manufacturing an anti-corner collapse segment, used for manufacturing an anti-corner collapse segment according to any one of claims 1 to 8, characterized in that: The production steps include: S1, making the skeleton; Making the protective member, and welding and fixing the connecting member on the protective member; Making fiber concrete; S2, welding and fixing the protective member to the steel bars at the corners of the pipe segments of the frame body; S3, installing the combined structure formed by the frame body, the protective member and the connecting member in a segment mold; S4, pouring the prepared fiber concrete into the segment mold, so that the fiber concrete is fully bonded to the frame body, the protective member, and the connecting member; wherein, after the fiber concrete solidifies, the fiber concrete structure is formed; S5. Maintenance.

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