Sealing plug for tunnel reinforcement body, tunnel reinforcement sealing structure and tunnel reinforcement sealing method

Abstract

The present invention relates to a sealing plug for a tunnel reinforcement body, a tunnel reinforcement sealing structure and a tunnel reinforcement sealing method. The sealing plug comprises: a plug body, which is arranged at least at one end of the tunnel reinforcement body in the longitudinal direction of the tunnel, and has a first end and a second end along the longitudinal direction of the tunnel, the first end is connected and fixed to the tunnel reinforcement body, and the second end is adjacent to the end of the tunnel reinforcement body and has a limiting groove extending radially outward, and the notch of the limiting groove faces the existing structure of the tunnel; a flexible plug, which is embedded in the limiting groove and has an interference fit with the limiting groove, and has a first surface and a second surface along the radial direction of the tunnel, and is suitable for free deformation in a non-working state, and the first surface is in close contact with the existing structure of the tunnel in the working state, so that the flexible plug seals the mouth of the gap. The sealing plug for a tunnel reinforcement body of the present invention can effectively seal the gap between the tunnel reinforcement body and the existing structure of the tunnel, and the plug is detachable, so that the plug can be reused, reducing the material and use costs.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, in particular to tunnel reinforcement sealing, and specifically to a sealing plug for a tunnel reinforcement body, a tunnel reinforcement sealing structure and a tunnel reinforcement sealing method. Background Art

[0002] The reinforcement of existing structures in subway tunnels (including steel ring reinforcement, composite cavity, etc.) requires fixing the reinforcement body to the existing structure. There are three methods: mechanical connection (anchor connection), bonding and composite (mechanical connection + pasting). Few people use mechanical connection alone, and most of them use composite or pasting. In both methods, the reinforcement body and the existing structure are pasted with adhesives. During construction, the adhesive is in liquid form and is filled into the gap between the back of the reinforcement body and the existing structure by grouting. In this process, it is necessary to seal the gap between the two ends of the reinforcement body and the existing structure (such as shield segments) to prevent the adhesive from overflowing.

[0003] Before grouting, the two ends of the existing reinforcement body are first sealed with special sealant, that is, epoxy cement is used to seal the joints between the two sides of the reinforcement body and the pipe segments, and the reserved grouting holes and air outlet holes are sealed on both sides of the reinforcement body. Subsequently, a small electric grouting pump is used to inject epoxy resin from bottom to top until the upper reserved hole overflows the resin and stops, and the injection is repeated. The above method has the following problems:

[0004] (1) It needs to rely on manual work, which has low efficiency;

[0005] (2) It is difficult to achieve standardization, the installation accuracy is poor, the results are uneven, and it is greatly affected by factors such as personnel experience and sense of responsibility;

[0006] (3) The tunnel cross-section is large (the inner diameter of a subway tunnel is usually 5.5m or even larger), and the on-site work is done at height, which poses a safety risk of falling from a height.

[0007] In addition, due to the influence of construction accuracy and deformation in later operation, the cross section of the shield tunnel is not an ideal circle. For example, due to the influence of stratum deformation, the shield tunnel may have a horizontal duck egg deformation, that is, bulging in the horizontal direction and compression in the vertical direction. For another example, the shield tunnel may have an inner ring misalignment, that is, the inner surface joints of adjacent segments constituting the same ring of the shield tunnel may shift. Therefore, when the shield tunnel is reinforced with steel rings or composite cavities, the width of the gap between the reinforcement body and the existing structure is not fixed, and varies within a certain range along the tunnel ring.

[0008] Moreover, the existing sealing plug is not connected to the reinforcement body, and is easy to slip and fall off during the process of epoxy resin filling the gap, posing a safety hazard. Summary of the invention

[0009] In view of the deficiencies in the prior art, the main purpose of the present invention is to provide a sealing plug for a tunnel reinforcement body, a tunnel reinforcement sealing structure and a tunnel reinforcement sealing method to solve one or more problems in the prior art.

[0010] The technical solution of the present invention is as follows:

[0011] The present invention first provides a sealing plug for a tunnel reinforcement body, wherein the tunnel reinforcement body is circumferentially arranged on the inner side of an existing tunnel structure and is used to reinforce the existing tunnel structure, and a gap is provided between the tunnel reinforcement body and the existing tunnel structure, comprising:

[0012] The plug body is arranged at least at one end of the tunnel reinforcement body in the longitudinal direction of the tunnel, and has a first end and a second end along the longitudinal direction of the tunnel, the first end is connected and fixed to the tunnel reinforcement body, and the second end is adjacent to the end of the tunnel reinforcement body and radially extends outwardly to form a limiting groove, and the notch of the limiting groove radially faces the existing structure of the tunnel outward;

[0013] The flexible plug is embedded in the limiting groove and has an interference fit with the limiting groove. It has a first surface and a second surface along the radial direction of the tunnel. In the working state, the first surface is suitable for tightly contacting the existing structure of the tunnel, so that the flexible plug seals the mouth of the gap.

[0014] In some embodiments, the sealing plug also includes a limit adjustment piece, a limit hole is provided on the back of the limit groove, at least part of the limit adjustment piece is arranged in the limit groove through the limit hole, and is suitable for pushing the flexible plug to move to one side of the notch of the limit groove in a working state, so that the flexible plug is tightly attached to the existing structure of the tunnel.

[0015] In some embodiments, the limit adjustment member includes:

[0016] A limit adjustment bolt is threadedly connected to the limit hole, and the length of the limit adjustment bolt in the limit groove can be adjusted by rotating the limit adjustment bolt;

[0017] A limit nut is installed on the limit adjustment bolt and is used to fasten the limit adjustment bolt outside the limit groove.

[0018] In some embodiments, the sealing plug further includes a limiting pad, which is disposed in the limiting groove, one side of which is adhesively connected to the second side of the flexible plug, and the other side of which faces the limiting adjustment member.

[0019] In some embodiments, the plug body is an F-shaped cross-section, the head of the F-shaped cross-section forms the limiting groove, and the tail of the F-shaped cross-section is connected and fixed to the tunnel reinforcement body.

[0020] In some embodiments, a plurality of bolt holes are provided at the tail of the F-shaped cross section, and the tunnel reinforcement body is provided with identical holes opposite to the plurality of bolt holes, and the plug body and the tunnel reinforcement body are connected and fixed by fixing bolts passing through corresponding bolt holes.

[0021] In some embodiments, the flexible plug is made of EPDM rubber.

[0022] In some embodiments, at least one scale is preset on the flexible plug, and the scale is used to indicate the degree of contact between the flexible plug and the existing structure of the tunnel.

[0023] In some embodiments, the sealing plug further includes a fixed pressure strip, which is arranged on a side of the plug body away from the existing structure of the tunnel.

[0024] The present invention also provides a tunnel reinforcement sealing structure based on the above-mentioned sealing plug, comprising:

[0025] A tunnel reinforcement body is annularly arranged on the inner side of the existing structure of the tunnel, with the bottom end abutting against the roadbed, and is used to reinforce the existing structure of the tunnel, and there is a gap between the tunnel reinforcement body and the existing structure of the tunnel;

[0026] The interface bonding material is filled in the gap so that the tunnel reinforcement body and the existing structure of the tunnel are integrally stressed;

[0027] A sealing plug is arranged at at least one end of the tunnel reinforcement body in the longitudinal direction of the tunnel and is used to seal the mouth of the gap.

[0028] The present invention further provides a tunnel reinforcement sealing method based on the above-mentioned sealing plug, comprising the following steps:

[0029] S10: installing the flexible plug in the limiting groove at the second end of the plug body;

[0030] S20: Connecting and fixing the plug body with the flexible plug installed to the tunnel reinforcement body;

[0031] S30: Install the limit adjustment part;

[0032] S40: installing the tunnel reinforcement body with the plug body and the limit adjustment member installed on the existing structure of the tunnel;

[0033] S50: using the limit adjustment member to adjust the flexible plug until it is in close contact with the existing structure of the tunnel;

[0034] S60: filling the gap between the existing structure of the tunnel and the tunnel reinforcement body with an interface bonding material, and after the interface bonding material is cured, removing the plug body equipped with the flexible plug.

[0035] The beneficial effects of the present invention relative to the prior art are:

[0036] The sealing plug for the tunnel reinforcement body proposed in the present invention can effectively seal the gap between the tunnel reinforcement body and the existing structure of the tunnel. At the same time, the sealing plug for the tunnel reinforcement body adopts a detachable design, so that the plug can be reused, reducing material and use costs.

[0037] The sealing plug for the tunnel reinforcement body of the present invention adopts standardized operation, reduces uncertainty and improves the sealing effect.

[0038] The various components of the sealing plug for tunnel reinforcement of the present invention are prefabricated in a factory and then transported to the site for assembly, which simplifies the on-site operation process, improves on-site operation efficiency, further overcomes the limitation of short window period, and reduces labor time cost.

[0039] The sealing plug for the tunnel reinforcement body of the present invention has a certain rigidity, which can ensure that the plug does not change significantly during the process of epoxy resin filling the gap, and has a certain deformation adaptability, which can adapt to the changes in the gap between the tunnel reinforcement body and the existing structure of the tunnel.

[0040] The sealing plug for the tunnel reinforcement body of the present invention is a combination of rigidity and flexibility, which can well adapt to the change of gap thickness and ensure that the longitudinal shape is not affected by the pressure of the adhesive in the gap to cause excessive extrusion deformation and cause leakage of the adhesive.

[0041] The sealing plug for the tunnel reinforcement body of the present invention is connected and fastened to the tunnel reinforcement body, ensuring that the sealing plug will not slip or fall off during the process of epoxy resin filling the gap, thereby improving safety.

[0042] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0044] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0045] Figure 1 Schematic diagram of cross-sectional details of a sealing plug for a tunnel reinforcement body according to some embodiments of the present invention;

[0046] Figure 2 It is a three-dimensional schematic diagram of the details of the sealing plug for tunnel reinforcement body according to some embodiments of the present invention;

[0047] Figure 3 Schematic diagram of detailed exploded view of a sealing plug for a tunnel reinforcement body according to some embodiments of the present invention;

[0048] Figure 4 Schematic diagrams of the scales of the flexible plugs of some embodiments of the present invention, wherein (a) is a schematic diagram of a cross-section of the flexible plug and the existing structure of the tunnel in a non-working state, (b) is a schematic diagram of the scales shown on the side of the flexible plug in the state (a), (c) is a schematic diagram of a cross-section of the flexible plug and the existing structure of the tunnel in a working state, and (d) is a schematic diagram of the scales shown on the side of the flexible plug in the state (c);

[0049] Figure 5 Schematic diagram of tunnel reinforcement cross section according to some embodiments of the present invention.

[0050] Markings in the figure:

[0051] 1-existing structure of tunnel; 2-tunnel reinforcement body; 3-gap; 4-steel lining corbel; 5-ballast bed; 6-plug body; 601-limiting groove; 602-limiting hole; 603-bolt hole; 7-fixing pressure strip; 8-fixing bolt; 9-flexible plug; 10-limiting pad; 11-limiting adjustment piece; 1101-limiting adjustment bolt; 1102-limiting nut.

[0052] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0056] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device, component or structure must have a specific direction, be constructed or operate in a specific direction, and should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0059] The sealing plugs for the tunnel reinforcement body of the present invention are located at both ends of the tunnel reinforcement body 2, wherein the tunnel reinforcement body 2 is used to reinforce the existing structure 1 of the tunnel. The relationship between the tunnel reinforcement body 2 and the existing structure 1 of the tunnel is as follows: Figure 5 As shown, Figure 5 The figure shows a schematic diagram of a common subway shield tunnel reinforcement cross section (i.e., a cross section perpendicular to the tunnel axis direction), wherein the existing tunnel structure 1 is the structure to be reinforced, which is arranged at the outermost side and is composed of a number of shield segments spliced ​​together, and the tunnel reinforcement body 2 is arranged circumferentially on the inner side of the existing tunnel structure 1. There is a gap 3 between the tunnel reinforcement body 2 and the existing tunnel structure 1, and the gap 3 is suitable for filling the interface bonding material, such as adhesive, and the two edges of the gap 3 are suitable for installing the sealing plug for the tunnel reinforcement body of the present invention. Since the tunnel is a linear structure, there is no obvious change in the cross section along the longitudinal direction (axis direction), and the two ends of the gap between the tunnel reinforcement body 2 and the existing tunnel structure 1 need to be closed, and the plugs are located at both ends of the gap to play a sealing role to prevent the liquid adhesive from overflowing during the filling process.

[0060] More specifically, the sealing plug for the tunnel reinforcement body of the present invention is arranged at the gap 3 between the two ends of the tunnel reinforcement body 2 and the existing structure 1 of the tunnel, and is used to seal the mouth of the gap 3 to prevent the adhesive filled in the gap 3 from leaking out.

[0061] It is easy to understand that the adhesive here is usually a rigid epoxy resin, which is in liquid state during filling and solidifies after a certain period of time.

[0062] Continue to see Figure 5 The tunnel reinforcement body 2 is circumferentially arranged on the inner side of the existing tunnel structure 1. The tunnel reinforcement body 2 is composed of one or more reinforced steel rings or composite material plates spliced ​​circumferentially. The bottom end of the tunnel reinforcement body 2 abuts against one end of the steel lining bracket 4, and the other end of the steel lining bracket 4 abuts against the end of the roadbed 5. The roadbed 5 is fixedly arranged at the bottom of the shield tunnel and is arranged along the axis of the tunnel.

[0063] It is easy to understand that the track bed 5 is usually a concrete structure or a reinforced concrete structure, on which rails are laid.

[0064] See also Figures 1 to 4 The sealing plug for a tunnel reinforcement body of the present invention comprises a plug body 6 and a flexible plug 9. The sealing plug for a tunnel reinforcement body of the present invention has a certain rigidity, which can ensure that the plug does not change significantly during the process of filling epoxy resin in the gap 3 between the tunnel reinforcement body 2 and the existing structure 1 of the tunnel, and has a certain deformation adaptability, which can adapt to the change of the gap 3 between the tunnel reinforcement body 2 and the existing structure 1 of the tunnel.

[0065] Specifically, the plug body 6 is arranged at least at one end of the tunnel reinforcement body 2 in the longitudinal direction of the tunnel, and the plug body 6 has a first end and a second end along the longitudinal direction of the tunnel, and the first end is connected and fixed to the tunnel reinforcement body 2 to ensure that the gap 3 between the tunnel reinforcement body 2 and the existing structure 1 of the tunnel will not slip and fall off during the epoxy resin filling process. The second end of the plug body 6 is adjacent to the end of the tunnel reinforcement body 2 and radially extends outward to form a limiting groove 601, and the notch of the limiting groove 601 is radially outward facing the existing structure 1 of the tunnel, which is suitable for installing a flexible plug 9 to seal the mouth of the gap 3.

[0066] It is easy to understand that the plug body 6 of the present invention is an annular structure consistent with the tunnel reinforcement body 2.

[0067] In some embodiments, the plug body 6 is formed by connecting a vertical ring plate and two transverse ring plates, and the vertical ring plate is tightly fixed to the outer wall of the tunnel reinforcement body 2, and the end of the vertical ring plate away from the tunnel reinforcement body 2 is connected to the two transverse ring plates, the two transverse ring plates are arranged toward the side of the existing structure 1 of the tunnel, and the above-mentioned limiting groove 601 is formed between the two transverse ring plates.

[0068] In some embodiments, see Figures 1 to 3The plug body 6 has an F-shaped cross section, the head of the F-shaped cross section forms a limiting groove 601, and the tail of the F-shaped cross section is connected and fixed to the tunnel reinforcement body 2.

[0069] In some embodiments, see Figures 1 to 3 A first end of the plug body 6, for example, a tail portion of an F-shaped cross section, is provided with a plurality of bolt holes 603, and the plurality of bolt holes 603 are circumferentially arranged on the plug body 6 along at least one row, and the tunnel reinforcement body 2 is provided with identical holes opposite to the plurality of bolt holes 603, and the plug body 6 and the tunnel reinforcement body 2 are connected and fixed by fixing bolts 8 passing through corresponding bolt holes.

[0070] The present invention uses a fixing bolt 8 to connect the plug body 6 and the tunnel reinforcement body 2. On the one hand, the fixing bolt 8, as a fastening connector, can provide a strong mechanical locking force to ensure a firm connection between the plug body 6 and the tunnel reinforcement body 2; on the other hand, the standardized fixing bolt 8 connection design can greatly simplify the installation and disassembly process of the plug body 6 and the tunnel reinforcement body 2. Compared with welding or other non-detachable connection methods, bolt connection is easier to adjust and maintain, reducing construction difficulty and cost.

[0071] Continue to see Figures 1 to 3 The flexible plug 9 is embedded in the limiting groove 601 and has an interference fit with the limiting groove 601. The flexible plug 9 has a first surface and a second surface along the radial direction of the tunnel. When the flexible plug 9 is in working state, the first surface is in close contact with the existing structure 1 of the tunnel, so that the flexible plug 9 blocks the mouth of the gap 3.

[0072] It is easy to understand that the flexible plug 9 of the present invention is an annular strip structure consistent with the plug body 6.

[0073] In some embodiments, the flexible plug 9 is made of EPDM rubber.

[0074] In some embodiments, the cross-section of the flexible plug 9 is similar to a bullet shape, wherein the head of the bullet shape forms a first surface, and the tail of the bullet shape forms a second surface.

[0075] In some embodiments, the width of the flexible plug 9 along the Y direction (the tunnel axis direction) is slightly larger than the width of the limiting groove 601 , and the two are interference fit.

[0076] In some embodiments, the flexible plug 9 is a flexible plug with scales, and at least one scale is reserved on the flexible plug 9 . Figure 4 The figure shows the scale diagram of the flexible plug 9. Figure 4 (a) is a cross-sectional diagram of the flexible plug 9 and the existing structure of the tunnel in the non-working state. In this state, when observed from the side, it can be seen that Figure 4 The scale shown in (b). Figure 4(c) is a schematic cross-sectional view of the flexible plug 9 and the existing structure of the tunnel under a certain working state. In this state, when observed from the side, it can be seen that Figure 4 The scale shown in (d).

[0077] In this embodiment, the points closest to the flexible plug 9 and the structural surface are marked outward as t1, t2, t3, t4, ... The contact state between the flexible plug 9 and the existing structural surface of the tunnel is determined based on the lowest exposed scale. For example, when the lowest exposed scale is t1, it is determined that there is no contact between the two; when the lowest exposed scale is t2, it is determined that there is initial contact between the two; when the lowest exposed scale is t3, it is determined that there is a close contact between the two; when the lowest exposed scale is t4, it is determined that there is a close contact between the two. In the present invention, the relationship between the exposed scale and the degree of contact tightness (contact pressure) is determined in advance by a standardized test method.

[0078] Continue to see Figures 1 to 3 The present invention further includes a limit adjustment member 11. A limit hole 602 is provided on the back of the limit groove 601, at least part of the limit adjustment member 11 passes through the limit hole 602 and is arranged in the limit groove 601, and the limit adjustment member 11 is suitable for pushing the flexible plug 9 to move toward the notch side of the limit groove 601 in the working state, and fixing the flexible plug 9 when it is tightly attached to the existing structure 1 of the tunnel.

[0079] The position limiting adjusting member 11 of the present invention mainly serves to adjust the outwardly protruding length of the flexible plug 9 to adapt to the thickness change of the gap 3 between the existing structure 1 of the tunnel and the tunnel reinforcement body 2.

[0080] In some embodiments, see Figure 1 The limit adjustment member 11 includes a limit adjustment bolt 1101 and a limit nut 1102, wherein the limit adjustment bolt 1101 is inserted into the limit hole 602 and threadedly connected with the limit hole 602, and the limit nut 1102 is installed on the limit adjustment bolt 1101 to tighten the limit adjustment bolt 1101 outside the limit groove 601.

[0081] The present invention can adjust the length of the limit adjustment bolt 1101 in the limit groove 601 by rotating the limit adjustment bolt 1101. For example, when the limit adjustment bolt 1101 is rotated clockwise, due to the interaction of the threads, the limit adjustment bolt 1101 will move along the inside of the limit groove 601 accordingly, thereby shortening its exposed length outside the limit groove 601. Similarly, when the limit adjustment bolt 1101 is rotated counterclockwise, its length inside the limit groove 601 will be shortened and its exposed length outside the limit groove 601 will be increased. The limit nut 1102 is arranged outside the limit groove 601 and installed on the limit adjustment bolt 1101, and is suitable for tightening the limit adjustment bolt 1101 by using the limit nut 1102 after determining the length of the limit adjustment bolt 1101 extending into the limit groove 601, that is, when the limit adjustment bolt 1101 pushes the flexible plug 9 to be in close contact with the existing structure 1 of the tunnel.

[0082] In some embodiments, the sealing plug for tunnel reinforcement further includes a limiting pad 10, which is disposed in the limiting groove 601, one side of the limiting pad 10 is bonded to the second side of the flexible plug 9, and the other side faces the back of the limiting groove 601. The design of the limiting pad 10 can accurately control the position of the flexible plug 9, ensure that the flexible plug 9 can be pushed forward, and improve the stability and reliability of the close contact between the flexible plug 9 and the existing structure 1 of the tunnel.

[0083] In some embodiments, adhesive backing is provided between the limiting pad 10 and the flexible plug 9 , and the limiting pad 10 is adhered to the second surface of the flexible plug 9 through the adhesive backing.

[0084] In some embodiments, the limiting pad 10 is made of a thin metal sheet. The limiting pad 10 is generally made of copper or aluminum, which can make the forward deformation of the flexible plug 9 more uniform.

[0085] In some embodiments, the thickness of the limiting pad 10 is 1 mm to 2 mm, which is a moderate thickness. If it is too thin, the pad has low rigidity and is prone to deformation, which fails to achieve the purpose of uniform deformation of the flexible plug; if it is too thick, the pad occupies too much space.

[0086] The width of the limiting pad 10 is slightly smaller than the width of the limiting groove 601 , so that the limiting pad 10 can be snapped into the limiting groove 601 .

[0087] In some embodiments, the sealing plug for the tunnel reinforcement body also includes a fixed strip 7, which is circumferentially arranged on the side of the plug body 6 away from the existing structure 1 of the tunnel, and is tightly attached to the outer wall of the plug body 6. The fixed strip 7 has the same holes corresponding to the bolt holes 603 and the limiting holes 602, which are suitable for the fixing bolts 8 to pass through the bolt holes 603 and the limiting adjustment bolts 1101 to pass through the limiting holes 602 to tighten the tunnel reinforcement body 2 to prevent it from slipping and falling off, and at the same time make the contact between the plug body 6 and the reinforcement body more uniform and tight, reducing the possibility of detachment.

[0088] The sealing plug for the tunnel reinforcement body of the present invention is a combination of rigidity and flexibility. The plug body has large relative rigidity and small deformation, and the flexible plug has small relative rigidity and strong adaptability to deformation. In addition, the longitudinal deformation of the flexible plug is constrained by the plug body and has small deformation, while the radial elongation deformation is unconstrained and has large deformation. It can adapt well to changes in gap thickness and ensure that the longitudinal shape is not affected by the pressure of the adhesive in the gap, resulting in excessive extrusion deformation and leakage of the adhesive.

[0089] The sealing plug for tunnel reinforcement of the present invention adopts standardized operation to reduce uncertainty and improve the plugging effect. The standardized operation is relative to the existing plugging method of using artificial filling epoxy putty. There is no certain standard for the amount and shape of materials used in this method. It relies on the operating experience of construction workers, and there is a lot of arbitrariness in on-site implementation. The shape and width of the plugs at different positions in the same ring tunnel may be very different, and the plugs reinforced in another ring may change again; if a group of construction workers are replaced, the effect of the plug may be different. The present invention uses a standardized plugging structure and process, so the plugging construction effect is easier to standardize. Uncertainty refers to the large changes in the shape and width of the plug, and the large variability of the plugging effect.

[0090] In some embodiments, the present invention also proposes a tunnel reinforcement sealing structure based on the above-mentioned sealing plug, comprising a tunnel reinforcement body 2, an interface bonding material and a sealing plug. The tunnel reinforcement body 2 is circumferentially arranged on the inner side of the existing tunnel structure 1, and the bottom end is in contact with the roadbed 5, which is used to reinforce the existing tunnel structure 1, and there is a gap 3 between the tunnel reinforcement body 2 and the existing tunnel structure 1; the interface bonding material is filled in the gap 3, so that the tunnel reinforcement body 2 and the existing tunnel structure 1 are subjected to force as a whole; the sealing plug is arranged at least at one end of the tunnel reinforcement body 2 in the longitudinal direction of the tunnel, which is used to seal the mouth of the gap 3.

[0091] In some embodiments, the present invention further provides a tunnel reinforcement sealing method using the above-mentioned sealing plug, comprising the following steps:

[0092] S10: Install the flexible plug 9 in the limiting groove 601 at the second end of the plug body 6;

[0093] S20: Connect and fix the plug body 6 equipped with the flexible plug 9 to the tunnel reinforcement body 2;

[0094] S30: Install the limit adjustment member 11 corresponding to the limit hole 602;

[0095] S40: installing the tunnel reinforcement body 2 equipped with the plug body 6 and the limit adjustment member 11 onto the existing structure 1 of the tunnel;

[0096] S50: using the limit adjustment member 11 to adjust the flexible plug 9 until the flexible plug 9 is in close contact with the existing structure 1 of the tunnel;

[0097] S60: filling the gap 3 between the existing tunnel structure 1 and the tunnel reinforcement body 2 with an interface bonding material, and after the interface bonding material is cured, removing the plug body 6 equipped with the flexible plug 9.

[0098] This method has the following benefits:

[0099] (1) Improve installation efficiency and accuracy

[0100] 1) Clear step-by-step instructions: The installation process is broken down into several clear steps (S10 to S50) so that the installers can clearly understand the operation content and sequence of each step, thereby improving installation efficiency.

[0101] 2) Easy to control: Each step is targeted at a specific installation link, such as installing the flexible plug first, then connecting the plug body, and finally adjusting the position of the flexible plug. This sequence helps reduce errors and omissions during the installation process and improves installation accuracy.

[0102] (2) Ensure sealing effect

[0103] 1) Gradual tightening: By first installing the flexible plug (S10), then connecting the plug body and the tunnel reinforcement body (S20), and finally adjusting the position of the flexible plug (S50), it can be ensured that the flexible plug fits tightly with the existing structure of the tunnel during the gradual tightening process, thereby achieving a good sealing effect.

[0104] 2) Dynamic adjustment: The flexible plug can be dynamically adjusted using the limit adjustment parts (S30 and S50) to adapt to the changes in the gap between the existing structure and the tunnel reinforcement of different tunnels, ensuring the best sealing effect under any circumstances.

[0105] (3) Enhanced stability and security

[0106] 1) Firm connection: Firmly connecting the plug body to the tunnel reinforcement (S20) can ensure the stability of the entire sealing plug system in the tunnel and prevent loosening or falling off due to vibration or impact.

[0107] (4) Easy to maintain and replace

[0108] 1) Standardized operation: The flexible plug, plug body and limit adjustment parts are designed as detachable modules to facilitate maintenance and replacement when necessary. For example, when the flexible plug is worn or fails, it can be replaced alone without affecting the structure of the entire tunnel reinforcement.

[0109] 2) Quick response: Clear installation steps enable quick location of the problem and appropriate measures to be taken when sealing problems are discovered or maintenance is required, thus shortening maintenance time and reducing downtime losses.

[0110] In some embodiments, the sealing plug for the tunnel reinforcement body has five states, namely:

[0111] In the initial state, the plug body 6 is not fixed on the tunnel reinforcement body 2;

[0112] In the off-site pre-installed state, the plug body 6 is assembled and fixed on the tunnel reinforcement body 2;

[0113] On-site assembly state, the tunnel reinforcement body 2 is installed on the existing tunnel structure 1;

[0114] In the on-site working state, the flexible plug 9 is adjusted according to the actual situation until it is in close contact with the existing structure 1 of the tunnel;

[0115] After the on-site work is completed, the adhesive filled in the gap 3 between the tunnel reinforcement body 2 and the existing tunnel structure 1 is cured and the plug is removed.

[0116] Then start injecting adhesive, and use sealing plugs to seal the ends of the gaps in the tunnel reinforcement.

[0117] The various components of the sealing plug for tunnel reinforcement of the present invention are prefabricated in a factory and then transported to the site for assembly, which simplifies the on-site operation process, improves on-site operation efficiency, further overcomes the limitation of short window period, and reduces labor time cost.

[0118] In the present invention, there are five installation methods of sealing plugs for tunnel reinforcement bodies corresponding to the above five states, including the following steps:

[0119] First, in the initial state, the plug body 6, the flexible plug 9 and the limit pad 10 are assembled to form a plug assembly 1. Specifically, the following steps are included:

[0120] S1-1: Tear off the adhesive on the flexible plug 9, adjust the position to fit firmly with the limit pad 10, and apply butter on the side of the flexible plug 9 facing the gap 3;

[0121] S1-2: Gently press the flexible plug 9 to insert it into the limiting groove 601 of the plug body 6, and press it tightly so that the back of the limiting pad 10 is as close to the bottom of the limiting groove 601 as possible;

[0122] S1-3: Apply butter to the side of the plug body 6 facing the gap 3.

[0123] It is easy to understand that in this step, since the adhesive will be added to the gap 3 later, and the flexible plug 9 and the plug body 6 facing the gap 3 need to be in contact with the adhesive, the purpose of applying butter to the flexible plug 9 and the plug body 6 facing the gap 3 is to avoid the flexible plug 9 and the plug body 6 from adhering to the adhesive, so as to facilitate the removal of the plug body 6 after the adhesive is solidified.

[0124] Second, realize the off-site pre-installation state: fix the plug assembly 1 on the tunnel reinforcement body 2 to form the plug assembly 2. Specifically, the following steps are included:

[0125] S2-1: Align the corners and screw holes of the plug assembly 1, the tunnel reinforcement body 2 and the fixing strip 7, and fix them with fixing bolts 8;

[0126] S2-2: Determine the position of the limit hole corresponding to the limit adjustment bolt 1101 according to the misalignment position within the shield segment ring measured on site, drill and tap the fixed pressure strip 7, and install the limit adjustment bolt 1101 and the limit nut 1102.

[0127] Third, realize the on-site assembly state: fix the plug assembly 2 on the existing tunnel structure 1 to form the plug assembly 3. Specifically, the following steps are included:

[0128] S3-1: Install the plug assembly 2 onto the existing tunnel structure 1 according to the overall design requirements of the tunnel structure reinforcement plan, adjust the position of the plug assembly 2 and then fix it;

[0129] S3-2: Use epoxy putty to seal the joints of the circumferential blocks of the tunnel reinforcement body 2 to ensure the stability of the overall connection of the tunnel reinforcement body 2.

[0130] Fourth, realize the on-site working state: observe the gap 3 between the flexible plug 9 and the existing tunnel structure 1. If there is a gap 3 between the two, or the contact between the two is not tight, turn the limit adjustment bolt 1101 and tighten the limit nut 1102 to make the two contact tightly.

[0131] Fifth, end the on-site work status: according to the curing time of the adhesive used, after the adhesive filled in the gap 3 between the tunnel reinforcement body 2 and the existing tunnel structure 1 is cured, remove the fixing bolts 8 from top to bottom and remove the plug assembly 2 one by one.

[0132] In the present invention, the contact tightness between the flexible plug 9 and the existing structure 1 of the tunnel can be realized by observing the scale exposed on the top of the flexible plug 9. The scale is pre-sprayed on the first surface of the flexible plug 9. Setting the scale on the flexible plug 9 and using the scale to judge the contact relationship between the two have been described in detail above, and will not be described in detail here.

[0133] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0134] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing plug for a tunnel reinforcement body, wherein the tunnel reinforcement body is circumferentially arranged on the inner side of an existing tunnel structure and is used to reinforce the existing tunnel structure, and a gap is provided between the tunnel reinforcement body and the existing tunnel structure, characterized in that: The sealing plug includes: The plug body is arranged at least at one end of the tunnel reinforcement body in the longitudinal direction of the tunnel, and has a first end and a second end along the longitudinal direction of the tunnel, the first end is connected and fixed to the tunnel reinforcement body, and the second end is adjacent to the end of the tunnel reinforcement body and radially extends outwardly to form a limiting groove, and the notch of the limiting groove radially faces the existing structure of the tunnel outward; The flexible plug is embedded in the limiting groove and has an interference fit with the limiting groove. It has a first surface and a second surface along the radial direction of the tunnel. In the working state, the first surface is suitable for tightly contacting the existing structure of the tunnel, so that the flexible plug seals the mouth of the gap.

2. The sealing plug according to claim 1, characterized in that: The sealing plug also includes a limit adjustment piece, a limit hole is provided on the back of the limit groove, at least part of the limit adjustment piece passes through the limit hole and is arranged in the limit groove, which is suitable for pushing the flexible plug to move to one side of the notch of the limit groove in the working state, so that the flexible plug is close to the existing structure of the tunnel.

3. The sealing plug according to claim 2, characterized in that: The limit adjustment member comprises: A limit adjustment bolt is threadedly connected to the limit hole, and the length of the limit adjustment bolt in the limit groove can be adjusted by rotating the limit adjustment bolt; A limit nut is installed on the limit adjustment bolt and is used to fasten the limit adjustment bolt outside the limit groove.

4. The sealing plug according to claim 2, characterized in that: The sealing plug also includes a limiting pad, which is arranged in the limiting groove, one side of which is adhesively connected to the second side of the flexible plug, and the other side faces the limiting adjustment member; and / or, the sealing plug also includes a fixed pressure strip, which is arranged on the side of the plug body away from the existing structure of the tunnel.

5. The sealing plug according to claim 1, characterized in that: The plug body is an F-shaped cross section, the head of the F-shaped cross section forms the limiting groove, and the tail of the F-shaped cross section is connected and fixed to the tunnel reinforcement body.

6. The sealing plug according to claim 5, characterized in that: The tail of the F-shaped cross section is provided with a plurality of bolt holes, and the tunnel reinforcement body is provided with identical holes opposite to the plurality of bolt holes, and the plug body and the tunnel reinforcement body are connected and fixed by fixing bolts passing through corresponding bolt holes.

7. The sealing plug according to claim 1, characterized in that: The flexible plug is made of EPDM rubber.

8. The sealing plug according to claim 1, characterized in that: At least one scale is preset on the flexible plug, and the scale is used to indicate the contact tightness between the flexible plug and the existing structure of the tunnel.

9. A tunnel reinforcement sealing structure based on the sealing plug according to any one of claims 1 to 8, characterized in that: include: A tunnel reinforcement body is annularly arranged on the inner side of the existing structure of the tunnel, with the bottom end abutting against the roadbed, and is used to reinforce the existing structure of the tunnel, and there is a gap between the tunnel reinforcement body and the existing structure of the tunnel; The interface bonding material is filled in the gap so that the tunnel reinforcement body and the existing structure of the tunnel are integrally stressed; A sealing plug is arranged at at least one end of the tunnel reinforcement body in the longitudinal direction of the tunnel and is used to seal the mouth of the gap.

10. A tunnel reinforcement and sealing method based on the sealing plug according to any one of claims 1 to 8, characterized in that: The steps include: S10: installing the flexible plug in the limiting groove at the second end of the plug body; S20: Connecting and fixing the plug body with the flexible plug installed to the tunnel reinforcement body; S30: Install the limit adjustment part; S40: installing the tunnel reinforcement body with the plug body and the limit adjustment member installed on the existing structure of the tunnel; S50: using the limit adjustment member to adjust the flexible plug until it is in close contact with the existing structure of the tunnel; S60: filling the gap between the existing structure of the tunnel and the tunnel reinforcement body with an interface bonding material, and after the interface bonding material is cured, removing the plug body equipped with the flexible plug.

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