A lining ring with a prefabricated pipe segment assembly with a corbel connection base and an assembly method thereof

Abstract

A lining ring for assembling pipe segments with a prefabricated corbel connection base and an assembly method thereof, comprising a symmetrical double-sided wedge ring; the capping block assembly point is located at the 0° position of the lining ring, the ring width at the outer diameter of the ring at this point is the minimum or maximum value, the first standard block is at the 180° point opposite to the capping block, and the second standard block is adjacent to it on both sides, an integrally formed corbel connection base protruding outside the inner arc surface is arranged on the inner arc surface of the second standard block and the adjacent block, and is composed of connection base surfaces in the horizontal plane and the vertical plane, and four are symmetrically distributed in the lining ring, and the lining ring formed is mode 1 or mode 4. The capping block and the adjacent blocks on both sides are spliced ​​and rotated 180° around the Y axis to be in place, and the first standard block and the standard blocks spliced ​​with it are spliced ​​and rotated 180° around the Z axis to be mirrored to be in place, and the lining ring formed is mode 2 or mode 3. The versatility of the pipe segment is increased, and drilling and embedding of reinforcement on the inner arc surface of the pipe segment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and specifically relates to a lining ring assembled with prefabricated pipe segments with a corbel connection base and an assembling method thereof, which is used for assembling lining pipe segments inside a traffic tunnel constructed by a shield method. Background Art

[0002] The internal space of a traffic tunnel constructed by the shield method is usually divided into three layers from top to bottom according to functional zoning: the key smoke exhaust layer, the motor vehicle lane layer, and the evacuation and rescue and pipeline corridor layer. Figure 1 As shown in the figure, the flue plate, the roadway plate and other components realize force transmission with the main structure through the bracket supports at both ends. The bracket supports protrude from the inner arc surface of the pipe segment and are integrated with the pipe segment structure.

[0003] In the prior art, a construction method is usually adopted in which reinforcement is planted and anchored on the assembled segments and then the corbel support is cast. This method has the following shortcomings:

[0004] (1) Drilling damages the segment structure, especially for assembled lining structures, and the damage is difficult to repair.

[0005] (2) Drilling positioning is difficult and the waste hole rate is high. Reinforced concrete segments are prefabricated in blocks using high-precision steel molds. The concrete strength grade is high, the arc surface is smooth and round, and the internal steel bars are staggered. During the drilling operation, the positioning accuracy is difficult to guarantee. If the drilling position conflicts with the internal steel bars of the segment, the structural bearing capacity will be further damaged. This problem is more prominent when it is necessary to drill holes non-perpendicular to the inner arc surface of the segment.

[0006] (3) Due to the technical characteristics of drilling and anchoring as well as the limitations of on-site conditions, it is difficult to form an integral structure with cast-in-place corbels and prefabricated segments. The connection parts are risk points for controlling construction quality in terms of reliable force transmission, waterproof sealing, and durability.

[0007] (4) Construction operations such as drilling and reinforcing bars, cast-in-place corbels, etc. are intensive, inefficient, and environmentally friendly. They are carried out in parallel with shield tunneling, resulting in a lot of cross-interference.

[0008] In engineering practice, efforts have been made to improve the quality problems of drilling and rebar planting by improving assembly quality, marking the position of main reinforcement on the inner arc surface of the segment, and using non-destructive testing technology to accurately locate the reinforcement before drilling, but with little success.

[0009] In addition to the widespread application of rebar anchoring methods in engineering projects, research and attempts have been made on the connection methods between corbels and segments, including pre-installed steel plates on the inner surface of segments, reserved steel bars, pre-embedded steel bar connectors, and prefabrication of corbels.

[0010] Pre-embedded, reserved, prefabricated and other methods all face a common problem in the technical solution of universal wedge lining commonly used in large-diameter shield tunnels, where the pipe rings are rotated in an orderly manner to fit the center line of the line: the uncertainty of the assembly points of the universal wedge rings, that is, the position of the pipe blocks in the cross section.

[0011] The assembly points of the lining rings depend on design conditions such as the wedge method, wedge amount, and horizontal and vertical parameters of the line. The implementation plan for the assembly points of a certain ring of segments depends on the real-time posture of the shield machine.

[0012] The wedge shape determines the fitting ability of a single ring lining ring for the horizontal and vertical curves of the line. The horizontal and vertical curves and their combined line conditions determine the fitting target of the lining ring. Combined with the spatial posture of the shield machine and the need for real-time adjustment and correction, the optimal solution for the assembly points of the segments is finally selected. The spatial posture of the shield machine is affected by complex factors such as mechanical properties, operating level, geological conditions, and control standards. It is obtained from the feedback information of monitoring data such as the assembly status of the previous ring of segments, the travel of the shield machine's propulsion jack, and the shield tail gap. That is, the determination of the implementation plan for the assembly points of a specific ring of segments is a dynamic selection process.

[0013] The position of the internal structural components in the tunnel cross section is fixed and cannot change with the rotation of the lining ring. Therefore, the embedded, reserved, prefabricated and other structures adopted for a specific pipe block will lose the target position when the spatial position of each pipe block is dynamically adjusted, making it difficult to ensure its effectiveness. When a large number of redundant embedded, reserved and prefabricated methods are adopted, the cost is not worth the cost in terms of economy and construction convenience.

[0014] It is true that the assembly points of the lining rings have their own regularity, and the probability can be estimated through theoretical calculations combined with construction experience, but drilling and planting reinforcement is still inevitable.

[0015] In order to avoid drilling and reinforcing bars on the assembled lining segments, eliminate the quality risk of damaging the segments during drilling and reinforcing bars embedding operations, and improve the prefabrication and assembly rate of the tunnel's internal structure, the present invention proposes a pipe block prefabrication scheme with a corbel connection base and an assembly scheme matching the same, based on the technical scheme of adopting a universal wedge ring and staggered assembly into a ring in a large-diameter shield tunnel. Summary of the invention

[0016] The present invention provides a lining ring for assembling prefabricated segments with corbel connection bases and an assembling method thereof, the purpose of which is to solve the technical problem of prefabricating segments with corbel connection bases and meeting the requirements of staggered assembly, achieving the fitting of straight lines and curves in the line and improving the utilization rate of pipe blocks with the same shape.

[0017] The present invention is achieved through the following technical solutions:

[0018] A lining ring with a prefabricated pipe segment assembly with a corbel connection base, the lining ring is a lining ring with a double-sided wedge ring; the assembled pipe segments connected to each other by the lining ring include a capping block, an adjacent block, and a standard block; the two sides of the capping block are adjacent blocks, and the rest are standard blocks; it is characterized in that the double-sided wedge ring is a symmetrical wedge; the plane projection of the lining ring is an isosceles trapezoid; the standard block pipe segment has a mutually symmetrical shape and connection structure of the annular surfaces at both ends; the capping block assembly point is located at the 0° position of the lining ring, the ring width at the outer diameter of the ring at the capping block assembly point is the minimum value, and the standard block opposite to the capping block is The first standard block is arranged symmetrically at 180° points, and the standard blocks adjacent to it on both sides are the second standard blocks, and the standard blocks are spliced ​​in sequence in this way; the inner arc surface of the second standard block and the adjacent blocks are each provided with a corbel connection base which is integrally molded and cast and protrudes from the inner arc surface; the corbel connection base is composed of connecting base surfaces in two directions, the horizontal plane and the vertical plane, and the horizontal plane and the vertical plane are arranged and extended along the length direction of the tunnel; four of the corbel connection bases are symmetrically distributed in the lining ring, and each of the corbel connection bases is symmetrical with each other with the Z axis, the X axis and the Y axis as the symmetry axes, and the lining ring formed is called mode 1.

[0019] The lining ring is assembled with prefabricated segments with a corbel connection base, wherein the capping block and the adjacent blocks on both sides are spliced ​​as a whole, rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block and the standard blocks spliced ​​with it in sequence are spliced ​​as a whole, rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring formed is called mode 2.

[0020] The lining ring is assembled with prefabricated segments with corbel connection base, wherein the mode 1 and mode 2 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

[0021] The lining ring assembled from prefabricated segments with corbel connection base, wherein the ring width at the outer diameter of the ring at the assembly point of the capping block is the maximum value, is called mode 4.

[0022] The lining ring is assembled with prefabricated segments with a corbel connection base, wherein the capping block and the adjacent blocks on both sides are spliced ​​as a whole, rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block and the standard blocks spliced ​​with it in sequence are spliced ​​as a whole, rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring formed is called mode 3.

[0023] The lining ring is assembled with prefabricated segments with corbel connection base, wherein the mode 3 and mode 4 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

[0024] The lining ring is assembled with prefabricated pipe segments with a corbel connection base, wherein the lining ring is divided into 10 blocks, namely 7 standard blocks, 2 adjacent blocks and 1 capping block.

[0025] The lining ring is assembled with prefabricated pipe segments with a corbel connection base, wherein embedded steel bars and connector structures are arranged in the horizontal and vertical directions inside the corbel base to connect supporting components horizontally or vertically.

[0026] A method for assembling a lining ring with prefabricated segments with a corbel connection base, wherein the assembly method includes an assembly method of a fitted straight line or a fitted curve, the staggered assembly method of the fitted straight line is to assemble mode 1 adjacent to mode 2 or mode 3 adjacent to mode 4, and the staggered assembly method of the fitted curve is to assemble mode 1 adjacent to mode 3 or mode 2 adjacent to mode 4.

[0027] The method for assembling a lining ring with a prefabricated pipe segment with a corbel connection base, wherein when assembling the lining ring, the first standard block relative to the capping block is positioned, and then the second standard block, the third standard block, the fourth standard block adjacent to the first standard block are assembled symmetrically and in sequence, until the nth standard block, the adjacent block, and finally the capping block is inserted.

[0028] The technical features of the present invention are as follows:

[0029] (1) The pipe block corresponding to the position of the corbel is cast together with a part of the corbel during prefabrication. The part of the corbel cast together with the pipe segment is the corbel connection base.

[0030] (2) The corbel connection base is pre-embedded with connecting steel bars and connectors, which can be further connected to the remaining part of the corbel through the pre-embedded structure.

[0031] (3) The bracket connection base protrudes from the inner arc surface of the segment, is assembled together with the segment, and has connection base surfaces in two directions, which can be connected to the internal components of the tunnel in both horizontal and vertical directions.

[0032] (4) The segments have a symmetrical shape and connection structure, which allows the segments to be put into place by rotation or mirror flipping during the process of assembling into a ring.

[0033] (5) The lining ring has two fixed assembly points for the capping block at 0° and ±180°.

[0034] (6) The lining ring is divided into segments in two wedge-shaped directions based on the capping block at the same point, forming two groups of segments A and B with different shapes.

[0035] (7) The two assembly points and the two sets of pipe block series A and B can be combined to form four sets of pipe segment assembly modes. Through the orderly connection and combination of the four sets of pipe segment assembly modes, the center line of the line can be fitted while meeting the requirements of staggered assembly.

[0036] The most significant difference between the present invention and the prior art, taking the universal wedge ring as an example, is that the prefabricated segment component is provided with a corbel connection base.

[0037] Because the position of the corbels inside the tunnel needs to be fixed, the assembly position of the special segments with corbel connection bases needs to be fixed; and the segments are assembled into rings to achieve line fitting by rotating the points (see the explanation below for details); in order to resolve the contradiction between "fixed position" and "rotational assembly", the present invention proposes a set of corresponding segment assembly combination schemes, namely 4 groups of assembly modes.

[0038] In order to minimize the types of segment shapes, that is, to minimize the number of molds, a solution is proposed to make the end faces of the segment symmetrical on the toroidal surface. During assembly, the segment can be rotated around the Y axis or rotated 180° around the Z axis, that is, the vertical axis of the tunnel, by mirroring the ZY surface. This can increase the utilization rate of segments with the same shape.

[0039] The so-called "annular symmetry" is also different from the prior art. In the prior art, the annular surface of the segment is divided into a jack-facing surface and a jack-back surface, that is, the annular surface of the segment is asymmetrical, and the segment is directional along the longitudinal direction of the tunnel when assembled.

[0040] For example, the capping block is also conical or wedge-shaped in the longitudinal direction, with the larger annular surface (facing the jack surface) pointing to the forward direction of the shield machine, and the smaller annular surface (backward jack surface) pointing to the starting direction of the shield machine.

[0041] The capping block and the adjacent blocks in the present invention are still put into place by rotation, that is, they have the directionality of longitudinal insertion, which is the same as the prior art solution; however, the annular surfaces at both ends of the remaining blocks, such as the standard blocks B1 to B4, are completely the same in appearance and connection structure, and there is no difference between the front and rear jack surfaces, and they can be interchanged in a mirrored manner according to the assembly needs.

[0042] The so-called completely identical appearance is achieved through grooves symmetrical to the ring surface (mainly the grooves for waterproof strips to be pasted); the so-called completely identical connection structure is achieved through bent bolts. The reserved holes and hand holes of bent bolts are symmetrical to the ring surface, while oblique bolts are asymmetrical and directional.

[0043] Effects of the present invention:

[0044] The present invention adopts the form of prefabricated pipe segments with corbel connection bases, which can avoid drilling and embedding reinforcement on the inner arc surface of the pipe segment, eliminate the quality risk of damaging the pipe segment during drilling, and eliminate the construction difficulty of inaccurate positioning of drilling holes on smooth arc surfaces; since the pre-buried connectors in the corbel bases have the arrangement feature perpendicular to the connection base surface, the quality problems of slurry running and leakage existing in the method of directly embedding connectors on the arc surface of the pipe segment can be avoided, and the pre-buried reinforcement of the corbel bases can be smoothly connected with the reinforcements further connected, with clear force transmission and reasonable force bearing; since the corbel bases have the feature of being able to adapt to the The one-step horizontal or vertical pre-buried steel bars and connectors are easy to use in-situ casting or prefabricated component connection to form an integral corbel component, thereby improving the reliability of support. Since the segment shape and connection method have the characteristics of toroidal symmetry, such as the segment annular surface having symmetrical groove outer diameters and hand hole shapes, and the use of bent bolts for connection, the segment can not only be rotated around the Y-axis (tunnel longitudinal axis), but also can be mirrored around the Z-axis (tunnel vertical axis), which simplifies the segment shape types, increases the versatility of the segment, and reduces the amortization cost of the segment mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is the internal functional zoning structure layout diagram of the shield traffic tunnel lining segment in the prior art.

[0046] Figure 2 This is a diagram showing the internal structure of the shield tunnel lining segment according to an embodiment of the present invention.

[0047] FIG3(1) is a layout diagram of the segment assembly mode 1 of the present invention, and FIG3(2) is a top view of FIG3(1). FIG4(1) is a layout diagram of the segment assembly mode 2 of the present invention, and FIG4(2) is a top view of FIG4(1).

[0048] FIG5(1) is a layout diagram of the segment assembly mode 3 of the present invention, and FIG5(2) is a top view of FIG5(1).

[0049] FIG6(1) is a layout diagram of the segment assembly mode 4 of the present invention, and FIG6(2) is a top view of FIG6(1).

[0050] Figure 7 (1) and (2) are respectively large-scale drawings of the pre-embedded steel bars and connectors of the corbel connection base of the present invention.

[0051] Description of the accompanying drawings:

[0052] 1: Lining ring. 2-1: Key smoke exhaust duct layer; 2-2: Motor vehicle driving lane layer; 2-3: Evacuation and rescue and pipeline corridor layer. 3-1: Smoke duct plate; 3-2: Middle driving lane plate; 3-3: Side driving lane plate. 4-1: Smoke duct plate corbel support; 4-2: Driving lane plate corbel support.

[0053] 5-1: Ordinary segment; 5-2: Segment with corbel connection base; 5-3: Longitudinal connection bolt; 5-4: Longitudinal seam of lining ring; 5-5: Annular surface of lining ring. 6-1: Vertical surface; 6-2: Horizontal surface. 7-1: Minimum ring width at the outer diameter of lining ring; 7-2: Maximum ring width at the outer diameter of lining ring.

[0054] 8-1: Horizontal embedded connecting steel bars; 8-2: Vertical embedded connecting steel bars; 8-3: Horizontal embedded steel bar connector; 8-4: Vertical embedded steel bar connection. 9-1: Corbel connection base; 9-2: The remaining part of the corbel support that can be further connected horizontally; 9-3: The remaining part of the carriageway slab column that can be further connected vertically.

[0055] Description of the series numbering of group A pipe blocks: FA: pipe segment capping block number; L1A, L2A: pipe segment adjacent block number; B1A, B2A, B3A, B4A: pipe segment standard block number.

[0056] Description of the B group pipe block series numbering: FB: pipe segment capping block number; L1B, L2B: pipe segment adjacent block number; B1B, B2B, B3B, B4B: pipe segment standard block number.

[0057] The coordinate system conforms to the Cartesian right-hand coordinate system, the Y axis points into the paper, the Y axis is the longitudinal axis of the tunnel, the Z axis is the vertical axis of the tunnel, and X and Z in each figure represent the X axis and the Z axis; DETAILED DESCRIPTION

[0058] See also Figure 3(1)-6(2) As shown, a lining ring with a prefabricated segment assembly with a corbel connection base of the present invention, the lining ring 1 is a lining ring with a double-sided wedge ring; the assembled segments connected to each other by the lining rings include a capping block, an adjacent block, and a standard block; the two sides of the capping block are adjacent blocks, and the rest are standard blocks; the double-sided wedge ring is a symmetrical wedge; the plane projection of the lining ring is an isosceles trapezoid; the standard block segment has a mutually symmetrical shape and connection structure of the annular surfaces at both ends;

[0059] Figure 3(1) to Figure 4(2) The lining ring structure is a series of interconnected pipe blocks in group A. Figure 3 (1) (2) is mode 1, and Figure 4 (1) (2) is mode 2.

[0060] Figure 5(1) to Figure 6(2) The lining ring structure is a series of interconnected pipe blocks in group B. Figure 5 (1) (2) is mode 3, and Figure 6 (1) (2) is mode 4.

[0061] Figure 3 (1) (2) When the capping block (see number FA in the figure) is assembled at the 0° position of the lining ring, the ring width at the outer diameter of the ring at the capping block assembly point is the minimum value (see number 7-1 in the figure), and the standard block opposite to the capping block is the first standard block (see number B4A in the figure), which is symmetrically arranged at the 180° point, and the standard blocks adjacent to it on both sides are the second standard blocks (see number B3A in the figure), and so on. The standard blocks are assembled in sequence; the second standard block and the adjacent blocks (see number B4A in the figure) are assembled at the 0° position of the lining ring. On the inner arc surface of each of the tunnels (numbered L2A and L1A in the figure), there is a corbel connection base which is integrally molded and cast and protrudes from the inner arc surface; the corbel connection base is composed of connection base surfaces in two directions, the horizontal plane 6-2 and the vertical plane 6-1, and the horizontal plane and the vertical plane are arranged and extended along the length direction of the tunnel; four of the corbel connection bases are symmetrically distributed in the lining ring, and each of the corbel connection bases is symmetrical with each other with the Z axis, the X axis and the Y axis as the symmetry axes, and the lining ring formed is called mode 1.

[0062] FIG3(1)(2) shows a lining ring assembled with prefabricated segments with corbel connection base, wherein the capping block and adjacent blocks on both sides are spliced ​​as a whole, rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block and the standard blocks spliced ​​with it in sequence are spliced ​​as a whole, rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring thus formed is called Mode 2, see FIG4(1)(2).

[0063] The lining ring is assembled with prefabricated segments with corbel connection base, wherein the mode 1 and mode 2 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

[0064] The lining ring is assembled from prefabricated pipe segments with corbel connection base, Figure 6 (1) (2), wherein the ring width at the outer diameter of the ring at the assembly point of the capping block is the maximum value (see number 7-2 in the figure), and the lining ring thus formed is called mode 4, see Figure 6 (1) (2).

[0065] FIG6 (1) (2) shows a lining ring with prefabricated segments connected to a base with a corbel connection, wherein the capping block (see number FB in the figure) and the adjacent blocks on both sides are assembled as a whole (see number L2B, L1B in the figure), rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block (see number B4B in the figure) and the standard blocks sequentially spliced ​​therewith are assembled as a whole, rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring thus formed is called Mode 3, see FIG5 (1) (2).

[0066] The lining ring is assembled with prefabricated segments with corbel connection base, wherein the mode 3 and mode 4 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

[0067] Preferably, the lining ring is assembled with prefabricated pipe segments with corbel connection base, wherein the lining ring is divided into 10 blocks, namely 7 standard blocks, 2 adjacent blocks and 1 capping block.

[0068] The lining ring assembled with prefabricated pipe segments with a corbel connection base is shown in Figure 7 (1) (2), wherein embedded steel bars and connector structures (8-1: horizontal embedded connecting steel bars; 8-2: vertical embedded connecting steel bars; 8-3: horizontal embedded steel bar connectors; 8-4: vertical embedded steel bar connections) are arranged inside the corbel base in both horizontal and vertical directions to connect supporting members (9-1: corbel connection base; 9-2: the remaining part of the corbel support that can be further connected horizontally; 9-3: the remaining part of the roadway slab column that can be further connected vertically).

[0069] A method for assembling a lining ring with a prefabricated pipe segment with a corbel connection base, the assembly method comprising an assembly method of a fitted straight line or a fitted curve, the fitted straight line staggered assembly method is to assemble mode 1 adjacent to mode 2 or mode 3 adjacent to mode 4, and the fitted curve staggered assembly method is to assemble mode 1 adjacent to mode 3 or mode 2 adjacent to mode 4.

[0070] The method for assembling a lining ring with a prefabricated pipe segment with a corbel connection base, wherein when assembling the lining ring, the first standard block relative to the capping block is positioned, and then the second standard block, the third standard block, the fourth standard block adjacent to the first standard block are assembled symmetrically and in sequence, until the nth standard block, the adjacent block, and finally the capping block is inserted.

[0071] The characteristics of the four-group segment assembly mode of the present invention are described as follows:

[0072] Figures 3(1), 4(1), 5(1) and 6(1) are cross sections of tunnel lining segments. Figures 3(2), 4(2), 5(2) and 6(2) are plane projections corresponding to Figures 3(1), 4(1), 5(1) and 6(1), respectively. 7-1 is the minimum ring width and 7-2 is the maximum ring width.

[0073] Mode 1: See Figure 3 (1), the capping block assembly point is located at the 0° position, and the ring width at the outer diameter of the ring at this point is the minimum value; see Figure 3 (2), the minimum ring width at the outer diameter of the lining ring is 7-1;

[0074] Mode 2: Figure 4 (1) The capping block assembly point is located at ±180°, and the ring width at the outer diameter of the ring at this point is the minimum value; see Figure 4 (2) The minimum ring width at the outer diameter of the lining ring is 7-1;

[0075] Mode 3: Figure 5 (1) The capping block assembly point is located at ±180°, and the ring width at the outer diameter of the ring at this point is the maximum; see Figure 5 (2) The maximum ring width at the outer diameter of the lining ring is 7-2,

[0076] Mode 4: Figure 6 (1) The capping block assembly point is located at the 0° position, and the ring width at the outer diameter of the ring at this point is the maximum. See Figure 6 (2) The maximum ring width at the outer diameter of the lining ring is 7-2.

[0077] When the ring width at the outer diameter of the ring at the assembly point of the capping block is the minimum value, that is, mode 1 or 2, the shape of the wedge-shaped lining ring is the A group pipe block series; when the ring width at the outer diameter of the ring at the assembly point of the capping block is the maximum value, that is, mode 3 or 4, the shape of the wedge-shaped lining ring is the B group pipe block series. For the sake of simplicity, the suffixes A and B are omitted from the numbers of the following A group pipe block series and B group pipe block series.

[0078] When assembling, the first standard block B4, which is opposite to the capping block F, is positioned first. Figure 3(1) to Figure 6(2) Block B4 in the segment assembly pattern layout diagram, and then symmetrically and sequentially assemble the second standard block B3, the third standard block B2, the fourth standard block B1, the adjacent block two L2, the adjacent block one L1 adjacent to the first standard block B4, and finally insert the capping block F.

[0079] Assuming that when the capping block is located at the bottom of the arch, the pipe blocks that are in place before the capping block are affected by their own gravity, and there will be position deviation and accumulation of deviations, which will cause the space left for the capping block to be smaller than the outer contour of the capping block. At this time, the capping block cannot be put into place, and the lining ring cannot be closed into a complete ring. When the reaction force of the jack is increased to try to force insertion, the contact surface of the pipe segment will be overloaded, causing cracking and damage to the concrete. Therefore, unless there are special circumstances, such as when correction is necessary, the capping block should be avoided from being assembled at points below the horizontal line.

[0080] As mentioned above, the present invention designs the four groups of patterns for two purposes. First, the need to fit the tunnel lining ring to the flat curve and adjust the shield machine posture (i.e., deviation correction) is achieved through the assembly and combination of each pattern. To put it more simply, the fitting of straight lines and curves is achieved through the assembly and combination of each pattern, and even if the errors that may occur in actual construction are ignored, it is believed that accurate positioning can be achieved during construction; second, the requirements of staggered assembly are met.

[0081] If the requirement of staggered assembly is not considered, only Mode 1 and Mode 2, or only Mode 3 and Mode 4, can be used to achieve straight line or curve fitting. The principle is detailed above.

[0082] Take only Mode 1 and Mode 2 as an example:

[0083] When the longitudinal assembly combination is: …+mode 1+mode 1+mode 1+…, this section of the tunnel turns to the right (the forward direction is upward in the figure, the same below); …+mode 2+mode 2+mode 2+…, this section of the tunnel turns to the left; …+mode 1+mode 2+mode 1+mode 2+…, this section of the tunnel remains straight.

[0084] When the above combination does not meet the requirements of staggered assembly, that is, mode 1+mode 1+mode 1 is a continuous seam, mode 3 is added. When ...+mode 1+mode 3+mode 1+mode 3+... is adopted, the tunnel section is also turned to the right, realizing staggered assembly.

[0085] The combination of mode 2 and mode 4 is similar and will not be described in detail.

[0086] Modes 1 and 2 have the same segment shape; Modes 3 and 4 have the same segment shape.

[0087] Based on the aforementioned principles and design ideas, the four groups of assembly modes each have their own uses, and the functions described are achieved through their combination.

[0088] The solution of the present invention adds another set of segments with different shapes and two additional segment assembly points (i.e., modes) in order to make the segment with a special shape and a corbel base relatively fixed in position in the assembled lining ring. The position of the internal structure of the tunnel is fixed and cannot be changed by the rotation of the lining ring assembly point.

[0089] The capping block (FA) and adjacent blocks one and two (L1A, L2A) are put into place by rotating 180° around the Y axis (the longitudinal axis of the tunnel), and the standard blocks (B1A, B2A, B3A, B4A) are put into place by mirroring around the Z axis (the vertical axis of the tunnel), thereby realizing the transformation between mode 1 and mode 2.

[0090] Similarly, the capping block (FB) and adjacent blocks one and two (L1B, L2B) are put into place by rotating 180° around the Y axis (the longitudinal axis of the tunnel), and the standard blocks (B1B, B2B, B3B, B4B) are put into place by mirroring around the Z axis (the vertical axis of the tunnel), thereby realizing the transformation between mode 3 and mode 4.

[0091] To avoid through seams, assembly mode 1 and mode 4 are not adjacent, and mode 2 and mode 3 are not adjacent.

[0092] This is to achieve staggered assembly. When mode 4 is adjacent to mode 1, although a straight line can be fitted, a through seam will appear. When a straight line needs to be fitted, mode 2 can be adjacent to mode 1; when a curve needs to be fitted, mode 3 can be adjacent to mode 1; if mode 1 is adjacent to mode 1, a curve can be fitted, but a through seam will appear.

[0093] Based on the shape and assembly method of the prefabricated pipe segment, the position of the corbel base prefabricated together with the pipe segment can be relatively fixed, laying the foundation for the further connection of the corbel components; based on the embedded steel bars and connector structure arranged in two directions perpendicular to each other inside the corbel base, the supporting components can be further connected horizontally or vertically.

[0094] The present invention is further explained below:

[0095] The tunnel structure constructed by the shield method is composed of several prefabricated segments, which are assembled into a ring in sequence to form a circular ring lining structure. The so-called "capping block" refers to the last segment assembled in the assembly sequence. After the capping block is in place, the lining structure forms a complete and closed circular ring. It is generally believed that when the capping block is located at the top of the circular ring, it is easier to control the assembly quality. Therefore, the title of "capping block" was generated and continues to this day.

[0096] It can also be understood as the topping out of the building, which represents the completion of the main structure civil engineering project and is a landmark event.

[0097] With the development of technology, especially the emergence of universal wedge-shaped ring lining and its application in a large number of engineering practices, the position of the capping block is no longer limited to the position of the arch (and nearby). It can be flexibly set according to the needs of horizontal and vertical fitting, posture correction, and staggered assembly of the tunnel. It can be at any reasonable assembly point of the ring, such as the arch bottom, arch shoulder, arch waist, etc. In engineering, it is still necessary to try to avoid the capping block appearing at the assembly position of the arch bottom. Therefore, the "capping block" can also be called "K block" (meaning Key), "key block", etc., and the name "capping block" is more general. In addition to the wedge-shaped annular surface, the capping block also has a longitudinal wedge shape (or a taper along the longitudinal direction of the tunnel) due to the need for longitudinal insertion, so it has a special shape. The adjacent pipe blocks are called "adjacent blocks" (two blocks), and the remaining pipe blocks are called "standard blocks".

[0098] The wedge ring refers to the annular surface of the lining ring (the complete ring after assembly), which is an inclined surface, and its plane projection is a trapezoid. It is precisely because the end surface of the lining ring has a plane wedge shape that when the lining rings are connected longitudinally, that is, the annular surfaces are closely attached to each other, the cylindrical structure (tunnel) formed can fit the plane curve and adjust the shield posture (i.e., correct deviation). If the end surface of the lining ring does not have an inclined annular surface and the lining rings are of equal width, they can only be assembled to form a straight line.

[0099] The wedge amount is the difference between the maximum width and the minimum width of the lining ring. In engineering, double-sided wedges are usually used. See 7-1 and 7-2 in the top view of Figure 3 (2), Figure 4 (2), Figure 5 (2), and Figure 6 (2) for details.

[0100] The universal wedge-shaped lining ring refers to a prefabricated component produced by reasonably dividing the longitudinal seams, i.e., dividing the blocks, so that only one set of prefabricated segment molds is used, and the combination of the prefabricated components can achieve curve fitting lining rings only by rotating the assembly points.

[0101] The universal wedge-shaped lining ring has two standard assembly points, and the capping blocks are both located at the arch waist, which are horizontal positions of 0° and 180° respectively.

[0102] In Mode 1 and Mode 3, when the capping block is located at 0° or 180°, the minimum width of the entire circular ring is at 0° and the maximum width is at 180°; in Mode 2 and Mode 4, when the capping block is located at 180° or 0°, the minimum width of the entire circular ring is at 180° and the maximum width is at 0°.

[0103] It should be pointed out that when we describe the assembly position of the wedge lining ring, we usually only say that the capping block is at a certain point. This does not mean that the capping block alone determines the control position of the wedge ring, but rather that the positioning of the capping block represents the assembly position of each segment of the entire ring. That is, the capping block position is a certain position symbol.

[0104] The basic principle of assembling straight lines and flat curves by combining wedge-shaped lining rings is that when the lining rings are assembled continuously along the longitudinal direction (i.e. the tunnel axis), from the perspective of plane projection, since the lining rings are wedge-shaped, the normal direction of the ring surface points to the tunnel axis, but is not parallel to the tunnel axis, but has a small, fixed deviation angle with the tunnel axis. As shown in Figure 3 (2), in mode 1, the 0° direction of the tunnel lining structure is the minimum ring width and the 180° direction is the maximum ring width. If the next ring adjacent to this ring continues to use the assembly point of mode 1, then similarly, the minimum ring width of the tunnel lining structure is located in the 0° direction and the maximum ring width is located in the 180° direction. Then, the normal direction of the end face after assembly is further at a small, fixed deviation angle with the tunnel axis; ...; this cycle is repeated to achieve the turning of the lining structure axis.

[0105] The wedge amount of the wedge ring (indicated by the symbol Δ) is set symmetrically to the axis of the circular ring, and the ring width at the axis is the standard ring width (indicated by the symbol B), then the maximum ring width Bmax = B + Δ / 2, and the minimum ring width Bmin = B - Δ / 2. Taking the standard ring width of 2m as an example, the wedge ring fits the tunnel axis, that is, a short straight line with a longitudinal step length of 2m is used to continuously approach and fit the target curve. By selecting different assembly points and their combinations, the error between the short straight line and the target curve (i.e., the tunnel line, including straight lines, flat curves, transition curves and their combinations) is controlled within the range allowed by the specification.

[0106] When rail transit section tunnels are constructed by the shield method, the lining ring method usually adopted is "straight ring + left and right turning ring". Different from the general wedge-shaped lining ring, the straight ring is an equal-width ring and the left and right turning rings are wedge-shaped rings. The advantage is that it can basically ensure that the position of the capping block is at or near the vault. The disadvantage is that the straight ring, left turning ring, and right turning ring use three sets of molds with different shapes respectively. However, this disadvantage is economically acceptable after the demand for prefabricated components reaches a certain scale. After all, each set of molds has a service life, and the number of prefabricated components that can be produced is also limited.

[0107] Let's go back to the universal wedge lining ring. Because it only uses one set of molds, it must require the pipe block's splitting and assembly points to still meet the staggered assembly and have the ability to fit straight lines and curves after rotating 180°. Therefore, it is a better solution to locate the capping block at the horizontal position, that is, the arch waist position. Otherwise, the capping block is not located at the horizontal position, but appears at a point above the horizontal line. After rotating 180°, the capping block must appear at the corresponding position below the horizontal line, which is not conducive to the smooth assembly of the capping block and should be avoided.

[0108] Example

[0109] The shape, structure and assembly method of the prefabricated pipe segment with a bracket connection base proposed in the present invention can be applied to the situation where a flue plate, a roadway plate or other internal supporting components need to be connected to a lining structure formed by assembling prefabricated pipe segments. Figure 2 connection structure.

[0110] The above description in conjunction with the accompanying drawings is only one of the application examples listed to illustrate the intention, principle and method of the present invention. For example, the lining ring is divided into 10 blocks, namely 7 standard blocks, 2 adjacent blocks and 1 capping block; the pipe segments are connected circumferentially by oblique bolts; the pipe rings are connected longitudinally by 28 or 28 groups of bent bolts evenly distributed circumferentially; the lining ring is a double-sided wedge; the internal components are arranged as a single-layer carriageway with a key smoke exhaust duct; the flue plate corbel support is further formed by cast-in-place method, and the carriageway plate columns are further formed by cast-in-place method or by connecting prefabricated components, etc., which are not used to limit the present invention.

[0111] For the engineers and technicians in this field, they can still modify the technical solutions described in the examples listed, or make equivalent substitutions for some of the technical features therein, but any modifications, equivalent substitutions, improvements, etc. made within the intent, principle, and method of the present invention should be included in the protection scope of the present invention.

Claims

1. A lining ring with a prefabricated segment assembly with a corbel connection base, wherein the lining ring is a lining ring with a double-sided wedge ring; the assembled segments connected to each other by the lining ring include a capping block, an adjacent block, and a standard block; the two sides of the capping block are adjacent blocks, and the rest are standard blocks; characterized in that: The double-sided wedge ring is a symmetrical wedge; the plane projection of the lining ring is an isosceles trapezoid; the standard block segment has a mutually symmetrical shape and connection structure of the ring surfaces at both ends; the capping block assembly point is located at the 0° position of the lining ring, and the ring width at the outer diameter of the ring at the capping block assembly point is the minimum value. The standard block opposite to the capping block is the first standard block, which is symmetrically arranged at the 180° point position, and the standard blocks adjacent to it on both sides are the second standard blocks, and the standard blocks are spliced ​​in sequence by analogy; the inner arc surface of the second standard block and the adjacent block are each provided with a corbel connection base that is integrally molded and cast and protrudes from the inner arc surface; the corbel connection base is composed of connection base surfaces in two directions of the horizontal plane and the vertical plane, and the horizontal plane and the vertical plane are arranged and extended along the length direction of the tunnel; the corbel connection base is symmetrically distributed in four in the lining ring, and each of the corbel connection bases is symmetrical with the Z axis, the X axis and the Y axis as the symmetry axis, and the lining ring formed is called mode 1; On the basis of Mode 1, the capping block and the adjacent blocks on both sides are spliced ​​as a whole, rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block and the standard blocks spliced ​​with it in sequence are spliced ​​as a whole, rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring formed is called Mode 2; On the basis of mode 1, the ring width at the outer diameter of the ring at the assembly point of the capping block is the maximum value, and the lining ring formed is called mode 4; On the basis of Mode 4, the capping block and the adjacent blocks on both sides are spliced ​​as a whole and rotated 180° around the Y axis, i.e. the longitudinal axis of the tunnel, and the capping block is located at the 180° point; the first standard block and the standard blocks spliced ​​with it in sequence are spliced ​​as a whole and rotated 180° around the Z axis, i.e. the vertical axis of the tunnel, and the first standard block is symmetrically arranged at the 0° point. The lining ring formed is called Mode 3.

2. A lining ring assembled from prefabricated segments with a corbel connection base as claimed in claim 1, characterized in that: The mode 1 and the mode 2 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

3. A lining ring assembled from prefabricated segments with a corbel connection base as claimed in claim 1, characterized in that: The mode 3 and the mode 4 have the same shape of each segment, and the segments are respectively a capping block, an adjacent block, and a standard block.

4. A lining ring assembled from prefabricated segments with a corbel connection base as claimed in claim 1, characterized in that: The lining ring is divided into 10 blocks, including 7 standard blocks, 2 adjacent blocks and 1 capping block.

5. A lining ring assembled from prefabricated segments with a corbel connection base as claimed in claim 1, characterized in that: Embedded steel bars and connector structures are arranged in the horizontal and vertical directions inside the corbel connection base to connect the supporting components horizontally or vertically.

6. A method for assembling a lining ring with prefabricated segments with a corbel connection base as claimed in any one of claims 1 to 5, characterized in that: The assembling method includes an assembling method of fitting straight lines or fitting curves. The staggered assembling method of fitting straight lines is to assemble pattern 1 adjacent to pattern 2 or pattern 3 adjacent to pattern 4. The staggered assembling method of fitting curves is to assemble pattern 1 adjacent to pattern 3 or pattern 2 adjacent to pattern 4.

7. The method for assembling a lining ring with prefabricated segments with a corbel connection base as claimed in claim 6, characterized in that: When assembling the lining ring, the first standard block opposite to the capping block is positioned first, and then the second standard block, the third standard block, the fourth standard block adjacent to the first standard block are assembled symmetrically and in sequence, until the nth standard block, the adjacent block, and finally the capping block is inserted.

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