A tunnel segment lining secondary reinforcement structure and method thereof

Abstract

The present invention provides a secondary reinforcement structure for a tunnel segment lining and a reinforcement method thereof, comprising a primary reinforcement ring segment, wherein a secondary reinforcement arc segment is provided on the inner arc surface of the primary reinforcement ring segment, wherein a hollow grouting cavity is provided inside the secondary reinforcement arc segment, and the circumferential ends are open, the hollow grouting cavity is used for grouting a filler, and a grouting hole connected to the hollow grouting cavity is provided on the outer wall surface of the secondary reinforcement arc segment. By providing the hollow grouting cavity on the secondary reinforcement arc segment, its weight can be reduced, making it easier to carry and install. At the same time, a secondary reinforcement support structure can be quickly formed by grouting. In addition, by providing a snap-fit ​​fixing structure in combination with the lightweight secondary reinforcement arc segment, there is no need to drill holes during installation, which is convenient, fast and flexible.

Description

Technical Field

[0001] The present invention relates to the field of tunnel segment lining reinforcement, and in particular to a tunnel segment lining secondary reinforcement structure and a method thereof. Background Art

[0002] In recent years, major cities across China have seen a surge in rail transit construction, and the length of subway tunnels has continued to increase. However, some cities lack awareness of subway tunnel protection. After tunnel construction is completed or before operations begin, deep foundation pit excavation around the subway and heavy loads piled above the subway axis can cause tunnel axis deviation and structural damage. To ensure the structural safety of subway tunnels, some cities have implemented tunnel segment steel ring reinforcement technology before operations begin to eliminate safety hazards.

[0003] At present, the subway tunnel lining reinforcement structure in the industry generally adopts Q235 / Q345B steel plate with a thickness of 20-30mm for reinforcement construction; the whole ring reinforcement form is adopted, the ring width is 1200mm, and each ring is divided into 5-7 pieces. It needs to be determined in advance on site to ensure the fit between the steel ring and the inner wall of the pipe segment. After the steel ring is installed, the steel plates are secured with concrete-cracked, M16 / 8.8 grade special inverted hammer-shaped chemical anchors. (During installation, each steel plate is temporarily secured with expansion bolts, followed by permanent chemical anchors manually.) Adjustment of the chemical anchors at handholes and segment bolts is permitted. All joints between the steel plates within the steel ring are groove welded, with the weld height equal to the plate thickness. Effective measures should be taken during welding to prevent excessive deformation of the steel plates. The edges of the steel plates are sealed with epoxy mortar, and a rigid epoxy grout is then filled between the steel ring and the concrete segment. Where the bottom of the steel plate ring meets the ballast, a groove should be pre-cut into the ballast before construction. After grooving, the steel plates should be cleaned and the gaps between the steel plates and the ballast should be filled with a rigid epoxy grout. The grooves between the stiffeners should be backfilled with epoxy mortar until flush with the ballast surface, ensuring complete coverage of the stiffeners. The stiffeners and steel tie bars should be placed away from the contact rail mounting brackets.

[0004] However, when the tunnel undergoes secondary deformation and exceeds the supporting force of the first reinforcement structure, secondary reinforcement is required. The existing secondary reinforcement technology is to increase the supporting force by installing steel rings again on the primary reinforcement structure. The steel rings are heavy, and the installation and transportation are inconvenient. The construction is relatively cumbersome and requires a lot of maintenance time. Therefore, a tunnel segment lining secondary reinforcement structure and method are proposed to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a tunnel segment lining secondary reinforcement structure and method thereof, so as to solve the problem that the construction of the existing secondary reinforcement method is relatively cumbersome and requires a lot of maintenance time.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a secondary reinforcement structure of a tunnel segment lining, comprising a first reinforcement ring segment, a secondary reinforcement arc segment is arranged on the inner arc surface of the first reinforcement ring segment, a hollow grouting cavity is provided inside the secondary reinforcement arc segment, and the two circumferential ends are open, the hollow grouting cavity is used for pouring filler, and a grouting hole connected to the hollow grouting cavity is provided on the outer wall surface of the secondary reinforcement arc segment.

[0007] In a preferred embodiment, the middle portion of the secondary reinforcement arc-shaped piece is convex along the circumferential direction.

[0008] In a preferred embodiment, a plurality of ribs are provided inside the hollow grouting cavity, which separate the hollow grouting cavity into a plurality of separate grouting cavities, and a grouting hole communicating with each separate grouting cavity is provided on the outer wall surface of the secondary reinforcement arc piece.

[0009] In a preferred embodiment, the secondary reinforcement arc piece and the primary reinforcement ring piece are fixed via a snap-fit ​​structure.

[0010] In the preferred embodiment, the snap-fit ​​structure is composed of two groups of fixed plates symmetrically arranged on the inner arc surface of the first reinforcement ring plate, and the number of fixed plates in a group is not less than two. The fixed plates are right-angled snap-fit ​​plates with a "7"-shaped cross-section, and the inner wall width of the right-angled snap-fit ​​plate is adapted to the width of both sides of the secondary reinforcement arc plate.

[0011] In the preferred embodiment, the snap-fit ​​structure includes two groups of fixing plates symmetrically arranged on the inner arc surface of the first reinforcement ring plate. The fixing plates are vertical plates perpendicular to the inner arc surface of the first reinforcement ring plate. A snap-fit ​​groove is provided on the side of the fixing plate away from the first reinforcement ring plate, and snaps corresponding to the snap-fit ​​groove are provided on both sides of the secondary reinforcement arc plate.

[0012] In a preferred embodiment, the buckle includes a connecting elastic sheet arranged on the side of the secondary reinforcement arc sheet, elastic columns symmetrically arranged at the two edges of the side of the connecting elastic sheet, and interference blocks respectively arranged at the other ends of the two elastic columns, wherein the two interference blocks are both right-angled triangles and are symmetrically arranged;

[0013] The two inner wall surfaces opposite to each other of the card slot are each provided with a resisting card block corresponding to the resisting block, the resisting card block is a right triangle, and the resisting card block is parallel to the inclined surface of the resisting block;

[0014] A fitting groove adapted to the connecting elastic sheet is provided on one side of the card slot insertion opening close to the secondary reinforcement arc sheet.

[0015] The method includes:

[0016] S1. Monitor the installed tunnel lining first reinforcement ring;

[0017] S2. Determine whether a second reinforcement is required based on the monitoring data of the first reinforcement ring segment;

[0018] S3. When secondary reinforcement is required, install secondary reinforcement arc pieces on the inner arc surface of the first reinforcement ring piece. The secondary reinforcement position and method are reasonably selected according to the monitoring data analysis results. The secondary reinforcement arc piece can be installed as a whole ring or as part of a ring.

[0019] S4. Perform edge sealing on the contact surface between the secondary reinforcement arc piece and the primary reinforcement ring piece;

[0020] S5. Filling agent is injected into the grouting holes of the secondary reinforcement arc sheet to form secondary support force.

[0021] S6. Fill the gap between the secondary reinforcement arc piece and the primary reinforcement ring piece to ensure that the primary reinforcement ring piece and the secondary reinforcement arc piece fit tightly together to form an overall reinforcement system.

[0022] The preferred solution further includes monitoring the stress and deformation of the secondary reinforcement arc-shaped pieces after completing step S6, and analyzing whether to expand the scope of the secondary reinforcement structure based on the monitoring data.

[0023] In the preferred embodiment, the specific installation method of the secondary reinforcement arc plate is: place the secondary reinforcement arc plate close to the inner arc surface of the first reinforcement ring plate, and make each buckle correspond to each slot, and then push the secondary reinforcement arc plate toward the direction of the first reinforcement ring plate so that the buckle and the slot are fully engaged.

[0024] The present invention provides a secondary reinforcement structure for tunnel segment lining and a method thereof. By setting a hollow grouting cavity in the secondary reinforcement arc-shaped sheet, it is convenient to reduce its weight and facilitate transportation and installation. At the same time, a secondary reinforcement support structure can be quickly formed by grouting. In addition, by setting a snap-fit ​​fixing structure in combination with a lightweight secondary reinforcement arc-shaped sheet, there is no need to drill holes during installation, which is convenient, fast and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a structural diagram of the connection between the secondary reinforcement arc piece and the primary reinforcement ring piece of the present invention;

[0027] Figure 2 This is a structural diagram of the first embodiment of the secondary reinforcement arc sheet of the present invention;

[0028] Figure 3 This is a cross-sectional view of the structure of the first embodiment of the secondary reinforcement arc-shaped sheet of the present invention;

[0029] Figure 4This is a structural diagram of the second embodiment of the secondary reinforcement arc sheet of the present invention;

[0030] Figure 5 This is a structural diagram of the connection between the secondary reinforcement arc piece, the primary reinforcement ring piece and the fixing plate of the first embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the connection structure between the first reinforcement ring piece and the fixing plate of the first embodiment of the present invention;

[0032] Figure 7 This is a structural diagram of a first embodiment of a fixing plate of the present invention;

[0033] Figure 8 This is a structural diagram of the connection between the first reinforcement ring piece and the fixing plate of the second embodiment of the present invention;

[0034] Figure 9 This is a structural diagram of the secondary reinforcement arc sheet and the buckle connection of the present invention;

[0035] Figure 10 This invention Figure 6 Front view of the structure;

[0036] Figure 11 This invention Figure 10 A magnified view of the structure in the middle;

[0037] Figure 12 This is a structural diagram of the secondary reinforcement arc piece, the primary reinforcement ring piece and the fixing plate of the second embodiment of the present invention;

[0038] Figure 13 This is a structural diagram of a fixed plate according to a second embodiment of the present invention;

[0039] Figure 14 is a top view of the fixed plate structure of the second embodiment of the present invention;

[0040] Figure 15 This is a buckle structure diagram of the present invention;

[0041] Figure 16 This is a structural diagram of the connection between the card slot and the buckle of the present invention;

[0042] In the figure: secondary reinforcement arc piece 1; hollow grouting cavity 2; grouting hole 3; primary reinforcement ring piece 4; fixing plate 5; buckle 6; connecting elastic piece 61; elastic column 62; resistance block 63; card slot 51; resistance card block 52; fitting slot 53. DETAILED DESCRIPTION

[0043] Example 1

[0044] like Figure 1-3As shown, it includes a first reinforcement ring piece 4, and a secondary reinforcement arc piece 1 is provided on the inner arc surface of the first reinforcement ring piece 4. A hollow grouting cavity 2 is provided inside the secondary reinforcement arc piece 1, and the two circumferential ends are open, so that when multiple first reinforcement ring pieces 4 are combined, the hollow grouting cavities 2 are connected to form a reinforcement ring. The hollow grouting cavity 2 is used to pour filler, and a grouting hole 3 connected to the hollow grouting cavity 2 is provided on the outer wall surface of the secondary reinforcement arc piece 1.

[0045] The filler is epoxy resin, concrete or high-strength non-shrinkage grouting material, and the grouting holes 3 can be set on the inner arc surface or side surface of the secondary reinforcement arc-shaped piece 1.

[0046] In a preferred solution, in this embodiment, the middle portion of the secondary reinforcement arc-shaped piece 1 is convex along the circumferential direction, and the cross section is hollow and convex, so as to form a multi-level support structure and improve the support performance.

[0047] When in use, the secondary reinforcement arc piece 1 is fixed on the outer wall surface of the primary reinforcement ring piece 4 and then grouting is performed on the hollow grouting cavity 2 through the grouting hole 3 to form a secondary reinforcement structure.

[0048] Example 2

[0049] Further illustrate with reference to Example 1, Figure 4 The structure shown provides another embodiment of the secondary reinforcement arc sheet 1, wherein a plurality of ribs 7 are provided inside the hollow grouting cavity 2, and the number of the ribs 7 can be adjusted according to demand. The ribs 7 isolate the hollow grouting cavity 2 into a plurality of separate grouting cavities 8, and a grouting hole 3 connected to each separate grouting cavity 8 is provided on the outer wall surface of the secondary reinforcement arc sheet 1, so as to facilitate separate grouting of different separate grouting cavities 8 through multiple grouting holes 3.

[0050] In this embodiment, there are two ribs 7 , which cooperate with the side wall surface of the secondary reinforcement arc-shaped piece 1 to form three separate grouting cavities 8 .

[0051] During use, part of the separate grouting cavity 8 can be selected for grouting according to the required supporting force to form a separate reinforcement support. When the pressure is too large or deformation occurs again, the remaining separate grouting cavity 8 can be grouted to increase the supporting force again, thereby simplifying the reinforcement process. At the same time, the ungrouted separate grouting cavity 8 can be broken to observe the grouted separate grouting cavity 8.

[0052] Example 3

[0053] Further illustrate with reference to Example 1 or 2, as Figure 5-16 In the structure shown, the secondary reinforcement arc piece 1 and the primary reinforcement ring piece 4 are fixed by a snap-fit ​​structure, which facilitates the rapid fixation of the secondary reinforcement arc piece 1 .

[0054] The buckle structure has the following two embodiments:

[0055] The first embodiment of the buckle structure, such as Figure 5-7 As shown in the structure, the snap-fit ​​structure consists of two groups of fixing plates 5 symmetrically arranged on the inner arc surface of the first reinforcement ring plate 4. The number of fixing plates 5 in a group is not less than two. In this embodiment, the number of fixing plates 5 in a group is three. The fixing plates 5 are right-angled snap-fit ​​plates with a "7"-shaped cross-section. The inner wall width of the right-angled snap-fit ​​plate is adapted to the width of both sides of the secondary reinforcement arc plate 1.

[0056] When installing the secondary reinforcement arc piece 1 , it only needs to be inserted between the two sets of fixing plates 5 , and the installation and fixation of the secondary reinforcement arc piece 1 can be achieved by coordinating it with the circular curvature of the tunnel.

[0057] It should be noted that in this embodiment, when installing the last secondary reinforcement arc piece 1 to form a ring, the right-angle snap plate cannot be used for installation. It should be directly pushed between the two secondary reinforcement arc pieces 1 and fixed by gluing or bolts.

[0058] The second embodiment of the buckle structure, such as Figure 8-15 The structure shown in FIG. 4 includes two groups of fixing plates 5 symmetrically fixed on the inner arc surface of the first reinforcement ring piece 4. The fixing plates 5 are vertical plates perpendicular to the inner arc surface of the first reinforcement ring piece 4. A card slot 51 is provided on the side of the fixing plate 5 away from the first reinforcement ring piece 4. Card slots 6 corresponding to the card slots 51 are fixed on both sides of the secondary reinforcement arc piece 1. The secondary reinforcement arc piece 1 is fixed by the snap-fit ​​relationship between the card slots 51 and the card slots 6.

[0059] The number of each group of fixing plates 5 can be adjusted according to actual needs. In this embodiment, the number of each group of fixing plates 5 is three.

[0060] When installing the secondary reinforcement arc-shaped piece 1 , the buckle 6 is aligned with the slot 51 to complete the engagement of the two.

[0061] In the preferred embodiment, the buckle 6 includes a connecting elastic piece 61 arranged on the side of the secondary reinforcement arc piece 1, an elastic column 62 symmetrically arranged at the two edges of the side of the connecting elastic piece 61, and a resistance block 63 respectively arranged at the other end of the two elastic columns 62, wherein the two resistance blocks 63 are both right-angled triangles, and the two resistance blocks 63 are symmetrically arranged, the buckle 6 is in the shape of a "F" character, and the connecting elastic piece 61, the elastic column 62 and the resistance block 63 are integrally formed, and there is a gap between the elastic column 62 and the resistance block 63 and the secondary reinforcement arc piece 1, which facilitates the elastic column 62 and the resistance block 63 to be inserted into the card slot 51.

[0062] In a preferred embodiment, two opposing inner wall surfaces of the slot 51 are fixed with a resisting block 52 corresponding to the resisting block 63 . The resisting block 52 is a right triangle, and the inclined surface of the resisting block 52 and the resisting block 63 are parallel.

[0063] During use, the elastic column 62 and the resistance block 63 are inserted into the card slot 51. When the resistance block 63 contacts the inclined surface of the resistance block 63, the two resistance blocks 63 are tightened inward until they pass through the resistance card block 52 and return to their original state, thereby completing the engagement.

[0064] In the preferred embodiment, a fitting groove 53 that is adapted to the connecting elastic sheet 61 is provided on the side of the insertion port of the card slot 51 close to the secondary reinforcement arc sheet 1. The size of the fitting groove 53 is adapted to the size of the connecting elastic sheet 61, so that after the elastic column 62 and the resistance block 63 are fully inserted into the card slot 51, the connecting elastic sheet 61 is embedded in the fitting groove 53 to maintain flatness.

[0065] Example 4

[0066] Further illustrate with reference to Example 1, 2 or 3, as Figure 1-13 The structure shown is a method for secondary reinforcement of tunnel segment lining, the method comprising:

[0067] S1. Monitoring the installed tunnel lining first reinforcement ring segment 4, including monitoring the current bearing pressure and / or secondary deformation convergence of the tunnel lining structure;

[0068] S2. Determine whether a secondary reinforcement is required based on the monitoring data of the first reinforcement ring 4;

[0069] Specific testing includes: analyzing monitoring data to see if it approaches or exceeds the ultimate strength of the first reinforcement ring segment 4 structure, and comparing and analyzing with previous monitoring data to see if the deformation convergence of the tunnel lining structure has weakened;

[0070] The judgment basis includes: the pressure borne by the first reinforcement ring piece 4 structure is close to or exceeds the design strength of the first reinforcement ring piece 4 structure; the first reinforcement ring piece 4 structure has produced secondary deformation.

[0071] S3. When secondary reinforcement is required, install the secondary reinforcement arc piece 1 on the inner arc surface of the primary reinforcement ring piece 4. The secondary reinforcement position and method are reasonably selected according to the monitoring data analysis results. The secondary reinforcement arc piece 1 can be installed as a whole ring or as part of a secondary reinforcement arc piece 1.

[0072] S4, performing edge sealing on the contact surface of the secondary reinforcement arc piece 1 and the primary reinforcement ring piece 4;

[0073] S5, by injecting filler into the grouting hole 3 of the secondary reinforcement arc piece 1, forming a secondary support force

[0074] S6. Fill the gap between the secondary reinforcement arc piece 1 and the primary reinforcement ring piece 4 to ensure that the primary reinforcement ring piece 4 and the secondary reinforcement arc piece 1 are tightly fitted to form an integral reinforcement system.

[0075] S7. Monitor the stress and deformation of the secondary reinforcement arc piece 1, and analyze whether to expand the scope of the secondary reinforcement structure based on the monitoring data.

[0076] In the preferred embodiment, the specific installation method of the secondary reinforcement arc sheet 1 is: place the secondary reinforcement arc sheet 1 close to the inner arc surface of the first reinforcement ring sheet 4, and make each buckle 6 correspond to each slot 51, and then push the secondary reinforcement arc sheet 1 toward the first reinforcement ring sheet 4 so that the buckle 6 and the slot 51 are fully engaged.

[0077] It should be noted that the layout shape of the secondary reinforcement arc-shaped pieces 1 matches the layout shape of the primary reinforcement ring pieces 4 .

[0078] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for secondary reinforcement of tunnel segment lining, comprising a first reinforcement ring segment (4), characterized in that: A secondary reinforcement arc sheet (1) is provided on the inner arc surface of the primary reinforcement ring sheet (4); a hollow grouting cavity (2) is provided inside the secondary reinforcement arc sheet (1), and both ends of the circumference are open; the hollow grouting cavity (2) is used for grouting a filler; and a grouting hole (3) communicating with the hollow grouting cavity (2) is provided on the outer wall surface of the secondary reinforcement arc sheet (1); The hollow grouting cavity (2) is provided with a plurality of ribs (7) therein, the ribs (7) separating the hollow grouting cavity (2) into a plurality of separate grouting cavities (8), and a grouting hole (3) communicating with each separate grouting cavity (8) is provided on the outer wall surface of the secondary reinforcement arc-shaped sheet (1); The method includes: S1. Monitoring the installed tunnel lining first reinforcement ring (4); S2, judging whether a second reinforcement is required based on the monitoring data of the first reinforcement ring (4); S3. When secondary reinforcement is required, a secondary reinforcement arc piece (1) is installed on the inner arc surface of the first reinforcement ring piece (4). The secondary reinforcement position is reasonably selected according to the monitoring data analysis results. The entire ring of the secondary reinforcement arc piece (1) is installed, or a portion of the secondary reinforcement arc piece (1) is installed. S4, filling the gap between the secondary reinforcement arc piece (1) and the primary reinforcement ring piece (4) to ensure that the primary reinforcement ring piece (4) and the secondary reinforcement arc piece (1) are tightly fitted to form an overall reinforcement system; S5, performing edge sealing treatment on the contact surface of the secondary reinforcement arc piece (1) and the primary reinforcement ring piece (4); S6, forming a secondary supporting force by injecting a filler into the grouting hole (3) of the secondary reinforcement arc piece (1); According to the required support force, some of the separated grouting cavities (8) are selected for grouting to form a separate reinforcement support. When the pressure is too large or deformation occurs again, the remaining separated grouting cavities (8) are grouted to increase the support force again, thereby simplifying the reinforcement process. At the same time, the separated grouting cavities (8) that have not been grouted are broken, and the separated grouting cavities (8) that have been grouted are observed.

2. The method for secondary reinforcement of tunnel segment lining according to claim 1, characterized in that: The secondary reinforcement arc piece (1) and the primary reinforcement ring piece (4) are fixed via a snap-fit ​​structure.

3. The method for secondary reinforcement of tunnel segment lining according to claim 2, characterized in that: The snap-fit ​​structure is composed of two groups of fixing plates (5) symmetrically arranged on the inner arc surface of the primary reinforcement ring piece (4), the number of fixing plates (5) in one group being not less than two, the fixing plates (5) being right-angled snap-fit ​​plates with a "7"-shaped cross section, the inner wall width of the right-angled snap-fit ​​plates being adapted to the width of both sides of the secondary reinforcement arc piece (1).

4. The method for secondary reinforcement of tunnel segment lining according to claim 2, characterized in that: The buckle structure comprises two groups of fixing plates (5) symmetrically arranged on the inner arc surface of the first reinforcement ring piece (4), the fixing plates (5) being vertical plates perpendicular to the inner arc surface of the first reinforcement ring piece (4), a clamping groove (51) being provided on a side of the fixing plate (5) away from the first reinforcement ring piece (4), and buckles (6) corresponding to the clamping groove (51) being provided on both sides of the secondary reinforcement arc piece (1).

5. The method for secondary reinforcement of tunnel segment lining according to claim 4, characterized in that: The buckle (6) comprises a connecting elastic sheet (61) arranged on the side of the secondary reinforcement arc sheet (1), elastic columns (62) symmetrically arranged at two edges of the side of the connecting elastic sheet (61), and interference blocks (63) respectively arranged at the other ends of the two elastic columns (62), wherein the two interference blocks (63) are both right-angled triangles and are symmetrically arranged; The two inner wall surfaces opposite to each other of the slot (51) are both provided with a resisting block (52) corresponding to the resisting block (63), the resisting block (52) is a right triangle, and the inclined surfaces of the resisting block (52) and the resisting block (63) are parallel; A fitting groove (53) adapted to the connecting elastic sheet (61) is provided on one side of the insertion opening of the card slot (51) close to the secondary reinforcement arc sheet (1).

6. The method for secondary reinforcement of tunnel segment lining according to claim 1, characterized in that: The method further includes monitoring the stress and deformation of the secondary reinforcement arc-shaped piece (1) after completing step S6, and analyzing whether to expand the scope of the secondary reinforcement structure through monitoring data.

7. The method for secondary reinforcement of tunnel segment lining according to claim 4, characterized in that: The specific installation method of the secondary reinforcement arc piece (1) is as follows: the secondary reinforcement arc piece (1) is placed close to the inner arc surface of the primary reinforcement ring piece (4), and each buckle (6) is aligned with each slot (51), and then the secondary reinforcement arc piece (1) is pushed toward the primary reinforcement ring piece (4) so ​​that the buckle (6) and the slot (51) are engaged.

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