Support limiter and initial support structure

Abstract

The present invention discloses a support limiter and an initial support structure, which relate to the technical field of tunnel engineering. The support limiter comprises a first connecting steel plate, a second connecting steel plate, a plurality of limiter steel plates and a plurality of transverse diaphragm steel plates. The first connecting steel plate and the second connecting steel plate are arranged in parallel, and are both used to extend along the longitudinal direction of the tunnel and are connected to the steel frame of the initial support structure. A plurality of limiter steel plates are sequentially arranged between the first connecting steel plate and the second connecting steel plate, and the two ends of the limiter steel plate are respectively connected to the first connecting steel plate and the second connecting steel plate. A plurality of transverse diaphragm steel plates are respectively arranged between two adjacent limiter steel plates, and are respectively connected to the corresponding two limiter steel plates. The support limiter and the initial support structure both have the characteristics of controllable deformation and relatively uniform deformation.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and in particular to a support limiter and an initial support structure. Background Art

[0002] In tunnel inspection, the stability of the surrounding rock is of vital importance. The existing initial support structure generally adopts a resistor (yield unit). The structure of the existing resistor is roughly that a plurality of resistor steel plates are set to form a yield unit, and the plurality of resistor steel plates are vertically set between two horizontal steel plates. However, the bending direction of the vertical resistor steel plate is random during the stress deformation process. If the spacing between the vertical steel plates is too small, collision and superposition will occur, resulting in failure to ensure constant resistance and the appearance of secondary peaks. If the spacing is too large, it will not provide sufficient constant resistance. In addition, due to the difference between the stiffness of the high-rigidity steel frame used in the initial support of the tunnel and the early stiffness of the sprayed concrete, the resistors at different positions in the longitudinal direction of the tunnel are prone to uneven deformation, and even circumferential cracks in the initial support concrete may occur.

[0003] In view of this, it is particularly important to develop and design a support limiter and an initial support structure that can solve the above-mentioned technical problems. Summary of the invention

[0004] The object of the present invention is to provide a support limiter and an initial support structure, which have the characteristics of controllable deformation and relatively uniform deformation.

[0005] The present invention provides a technical solution:

[0006] In the first aspect, an embodiment of the present invention provides a support limiter, which includes a first connecting steel plate, a second connecting steel plate, multiple limiter steel plates and multiple cross-diaphragm steel plates; the first connecting steel plate and the second connecting steel plate are arranged in parallel, and are both used to extend along the longitudinal direction of the tunnel and connected to the steel frame of the initial support structure; multiple limiter steel plates are arranged in sequence between the first connecting steel plate and the second connecting steel plate, and the two ends of the limiter steel plate are respectively connected to the first connecting steel plate and the second connecting steel plate; multiple cross-diaphragm steel plates are respectively arranged between two adjacent limiter steel plates, and are respectively connected to the corresponding two limiter steel plates.

[0007] In combination with the first aspect, in another implementation of the first aspect, the interval between the resistance-limiting steel plates corresponding to the steel frame is a first resistance-limiting interval, and the interval between two adjacent resistance-limiting steel plates at other positions is a second resistance-limiting interval;

[0008] At least one transverse steel plate is arranged in the second blocking interval, the number of the transverse steel plates in the first blocking interval is greater than the number of the transverse steel plates in the second blocking interval, and the transverse steel plates in the same first blocking interval or the second blocking interval are arranged at intervals.

[0009] In combination with the first aspect and its above-mentioned implementation manner, in another implementation manner of the first aspect, the projection of the transverse steel plate within the second blocking interval in the first direction coincides with the projections of multiple transverse steel plates within the first blocking interval in the first direction; or, the projection of the transverse steel plate within the second blocking interval in the first direction is located between the projections of multiple transverse steel plates within the first blocking interval in the first direction; wherein, the first direction is the extension direction of the first connecting steel plate.

[0010] In combination with the first aspect and the above-mentioned implementation manner, in another implementation manner of the first aspect, there are two transverse steel plates in the first blocking interval, and the two transverse steel plates are at the same distance from the transverse steel plate in the second blocking interval.

[0011] In combination with the first aspect and the above-mentioned implementation manner, in another implementation manner of the first aspect, the distance between the transverse partition steel plates in multiple second limiting intervals and the first connecting steel plates is the same.

[0012] In combination with the first aspect and the above implementation manner thereof, in another implementation manner of the first aspect, the support limiter includes a plurality of the first connecting steel plates and a plurality of the second connecting steel plates;

[0013] A plurality of the first connecting steel plates are connected in sequence, and two adjacent first connecting steel plates are butt-jointed and welded; a plurality of the second connecting steel plates are connected in sequence, and two adjacent second connecting steel plates are butt-jointed and welded.

[0014] In combination with the first aspect and its above-mentioned implementation, in another implementation of the first aspect, the support limiter also includes a welded steel bar, which is arranged at the joint position of two adjacent first connecting steel plates and is welded and connected to the two first connecting steel plates.

[0015] In the second aspect, the embodiment of the present invention also provides an initial support structure, which includes multiple steel frames and the support limiter; the support limiter includes a first connecting steel plate, a second connecting steel plate, multiple limiter steel plates and multiple transverse steel plates; the first connecting steel plate and the second connecting steel plate are arranged in parallel, and are both used to extend along the longitudinal direction of the tunnel and connected to the steel frame of the initial support structure; multiple limiter steel plates are arranged in sequence between the first connecting steel plate and the second connecting steel plate, and the two ends of the limiter steel plate are respectively connected to the first connecting steel plate and the second connecting steel plate; multiple transverse steel plates are respectively arranged between two adjacent limiter steel plates, and are respectively connected to the corresponding two limiter steel plates. Multiple steel frames are connected in sequence and are used to be arranged along the circumference of the tunnel, and the support limiter is arranged between two adjacent steel frames, and the first connecting steel plate and the second connecting steel plate are respectively connected to the ends of the two steel frames.

[0016] In combination with the second aspect, in a first implementation of the second aspect, the initial support structure also includes a connecting support, which is connected to the end of the steel frame and connected to the first connecting steel plate to connect the steel frame and the first connecting steel plate.

[0017] In combination with the second aspect and the above-mentioned implementation manner, in a second implementation manner of the second aspect, the initial support structure also includes a steel mesh, and the steel mesh is respectively connected to the steel frame and the first connecting steel plate.

[0018] Compared with the prior art, the support limiter provided by the embodiment of the present invention has the following beneficial effects over the prior art:

[0019] The support limiter includes a first connecting steel plate, a second connecting steel plate, a plurality of limiter steel plates and a plurality of transverse diaphragm steel plates, wherein the first connecting steel plate and the second connecting steel plate are arranged in parallel and are used to extend along the longitudinal direction of the tunnel and are connected to the steel frame of the initial support structure. The plurality of limiter steel plates are sequentially arranged between the first connecting steel plate and the second connecting steel plate, and the two ends of the limiter steel plate are respectively connected to the first connecting steel plate and the second connecting steel plate to support the first connecting steel plate and the second connecting steel plate. A plurality of transverse steel plates are respectively arranged between two adjacent resistance limiting steel plates and are respectively connected to the corresponding two resistance limiting steel plates. In this way, the sides of the resistance limiting steel plates are connected by a plurality of transverse steel plates, so that the bending direction of the resistance limiting steel plates is deformed by the transverse steel plates, so that the bending deformation of the plurality of resistance limiting steel plates is in one direction, thereby reducing the probability of random bending direction of the resistance limiting steel plates during the stress deformation process, and further reducing the probability of collision and superposition between the resistance limiting steel plates, so as to keep the resistance value of the support resistance limiting device constant, avoid the occurrence of secondary peaks, and increase the effective compression stroke of the support resistance limiting device. In addition, the bending deformation of the resistance limiting steel plate will also be transmitted to the adjacent resistance limiting steel plate through the transverse steel plate, so that the deformation amplitude of the resistance limiting steel plates at different positions on the support resistance limiting device is roughly the same, so that its overall deformation is relatively uniform, and it is also difficult for the initial support concrete to have circumferential cracks.

[0020] The beneficial effects of the initial support structure provided by the embodiment of the present invention relative to the prior art are the same as the beneficial effects of the above-mentioned support limiter relative to the prior art, which will not be repeated here.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0023] Figure 1 A structural schematic diagram of the support limiter provided in an embodiment of the present invention applied to an initial support structure.

[0024] Figure 2 A schematic diagram of a partial three-dimensional structure of a support limiter provided in an embodiment of the present invention applied to an initial support structure.

[0025] Figure 3 A schematic structural diagram of a support limiter connected to a steel frame provided in an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of the structure of the support limiter after compression provided in an embodiment of the present invention.

[0027] Figure 5 A coordinate diagram of the compression amount and resistance value of the support limiter provided in an embodiment of the present invention during the compression process.

[0028] Icon: 100-initial support structure; 20-steel frame; 30-connecting support; 40-connecting angle steel; 50-steel mesh; 60-initial support concrete; 10-support limiter; 11-first connecting steel plate; 111-first limit interval; 122-second limit interval; 12-second connecting steel plate; 13-limit steel plate; 15-cross-diaphragm steel plate; 16-welded steel bar; B-first direction. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. The orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship usually placed when the invention product is used, or the orientation or position relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0031] It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" 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, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] Example:

[0034] See also Figure 1 and Figure 2 , Figure 1 A structural schematic diagram of a support limiter 10 provided in an embodiment of the present invention applied to an initial support structure 100. Figure 2 A partial three-dimensional structural diagram of the support limiter 10 provided in an embodiment of the present invention applied to an initial support structure 100. Figure 2 , the direction indicated by arrow B is the first direction B.

[0035] The embodiment of the present invention provides a support stopper 10, which has the characteristics of controllable deformation and relatively uniform deformation. The support stopper 10 can be applied to an initial support structure 100, etc. When the support stopper 10 is applied to the initial support structure 100, the support stopper 10 is arranged between two adjacent steel frames 20 to support the tunnel periphery together with the steel frames 20, and the support stopper 10 is arranged to adapt to the deformation of the tunnel periphery.

[0036] Since the initial support structure 100 adopts the support limiter 10 provided in the embodiment of the present invention, the initial support structure 100 also has the characteristics of controllable deformation and relatively uniform deformation.

[0037] The structural composition, working principle and beneficial effects of the support limiter 10 provided in an embodiment of the present invention will be specifically introduced below.

[0038] Please continue reading Figure 2 , and see Figure 3 and Figure 4 , Figure 3 A schematic structural diagram of a support limiter 10 connected to a steel frame 20 provided in an embodiment of the present invention. Figure 4 A schematic diagram of the structure of the support and limiter 10 after compression provided in an embodiment of the present invention.

[0039] The support limiter 10 includes a first connecting steel plate 11, a second connecting steel plate 12, a plurality of limiter steel plates 13 and a plurality of transverse diaphragm steel plates 15, wherein the first connecting steel plate 11 and the second connecting steel plate 12 are arranged in parallel, and are both used to extend along the longitudinal direction of the tunnel and connected to the steel frame 20 of the initial support structure 100. The plurality of limiter steel plates 13 are sequentially arranged between the first connecting steel plate 11 and the second connecting steel plate 12, and the two ends of the limiter steel plate 13 are respectively connected to the first connecting steel plate 11 and the second connecting steel plate 12 to support the first connecting steel plate 11 and the second connecting steel plate 12. A plurality of transverse steel plates 15 are respectively arranged between two adjacent resistance-limiting steel plates 13, and are respectively connected to the corresponding two resistance-limiting steel plates 13. In this way, the sides of the resistance-limiting steel plates 13 are connected by the plurality of transverse steel plates 15, so that the bending direction of the resistance-limiting steel plates 13 is induced by the transverse steel plates 15, so that the bending deformation of the plurality of resistance-limiting steel plates 13 is along one direction, such as Figure 4 As shown, the probability of the random bending direction of the resistance limiter steel plate 13 during the stress deformation process is reduced, and the probability of collision and superposition between the resistance limiter steel plates 13 is further reduced, so as to keep the resistance value of the support limiter 10 constant, avoid the occurrence of secondary peaks, and increase the effective compression stroke of the support limiter 10. In addition, the bending deformation of the resistance limiter steel plate 13 will also be transmitted to the adjacent resistance limiter steel plate 13 through the transverse steel plate 15, so that the deformation amplitude of the resistance limiter steel plate 13 at different positions on the support limiter 10 is roughly the same, so that its overall deformation is more uniform, and it is also difficult for the primary support concrete 60 to have annular cracks.

[0040] It should be noted that, in order to make the support limiter 10 have better yield deformation capacity and post-peak residual bearing capacity, the limiter steel plate 13 and the diaphragm steel plate 15 can be made of Q235 low-carbon steel.

[0041] Please continue reading Figure 2 , Figure 3 and Figure 4 , and see Figure 5 , Figure 5 A schematic diagram of the coordinates of the compression amount and resistance value of the support limit resistor 10 provided in the embodiment of the present invention during the compression process. Figure 5 In the figure, the vertical axis is the resistance value, the horizontal axis is the compression amount, the A1 line represents the relationship between the resistance value of the support limit resistor 10 and the compression amount when the cross-diaphragm steel plate 15 is removed, the A2 line represents the relationship between the resistance value of the position corresponding to the second limit resistor interval 122 of the support limit resistor 10 and the compression amount, and the A3 line represents the relationship between the resistance value of the position corresponding to the first limit resistor interval 111 of the support limit resistor 10 and the compression amount.

[0042] Further, the interval between the limiting steel plates 13 corresponding to the steel frame 20 is the first limiting interval 111, and the interval between two adjacent limiting steel plates 13 at other positions is the second limiting interval 122. Among them, a plurality of transverse steel plates 15 are arranged in the first limiting interval 111, and the plurality of transverse steel plates 15 are arranged in sequence, and a transverse steel plate 15 is arranged in the second limiting interval 122. In this way, by increasing the number of transverse steel plates 15 in the first limiting interval 111, the deformation resistance of the limiting steel plates 13 corresponding to the first limiting interval 111 is increased, or in other words, the stiffness of the support limiting device 10 at the position of the first limiting interval 111 is made larger to match the stiffness distribution of the initial support structure 100 in the longitudinal direction of the tunnel. By setting the limiting steel plates 13 with larger resistance in the first limiting interval 111 to support the steel frame 20, the overall deformation of the support limiting device 10 when adapting to the deformation of the tunnel hole is more uniform, and the probability of annular cracks in the initial support concrete 60 is further reduced.

[0043] It should be noted that, in other embodiments, at least two transverse steel plates 15 may also be arranged in the second limiting interval 122, and the number of transverse steel plates 15 in the first limiting interval 111 is greater than the number of transverse steel plates 15 in the second limiting interval 122, so that the stiffness distribution of the support limiter 10 matches the stiffness distribution of the initial support structure 100 in the longitudinal direction of the tunnel.

[0044] In addition, after the diaphragm steel plate 15 is provided, during the compression process of the support limiter 10, the initial peak values ​​at different positions are different, such as Figure 5 As shown, the resistance peak value at the position corresponding to the first resistance interval 111 of the support limiter 10 is greater than the resistance peak value at the position corresponding to the second resistance interval 122 of the support limiter 10, and the resistance peak value at the position corresponding to the second resistance interval 122 of the support limiter 10 is greater than the resistance peak value when the cross-bar steel plate 15 is removed from the support limiter 10. In addition, the resistance value at the position corresponding to the first resistance interval 111 of the support limiter 10 is greater than the resistance value at the position corresponding to the second resistance interval 122 of the support limiter 10 when it is constant, and the resistance value at the position corresponding to the second resistance interval 122 of the support limiter 10 when it is constant is greater than the resistance value at the state where the cross-bar steel plate 15 is removed from the support limiter 10 when it is constant. Thus, the steel frame 20 is better supported by the position corresponding to the first resistance interval 111. In addition, the cross-bar steel plate 15 can also be added to the second resistance interval 122 according to specific circumstances, so that the structural stiffness distribution of the support limiter 10 is more compatible with the application scenario.

[0045] Furthermore, the projection of the transverse steel plate 15 in the second blocking interval 122 in the first direction B is located between the projections of the plurality of transverse steel plates 15 in the first blocking interval 111 in the first direction B; wherein the first direction B is the extension direction of the first connecting steel plate 11. In other words, the transverse steel plate 15 in the second blocking interval 122 corresponds to the interval between the transverse steel plates 15 in the first blocking interval 111, so that the transverse steel plate 15 can stably transmit and guide the bending deformation of the blocking steel plate 13, and when the blocking steel plate 13 is bent and deformed, the deformation shape of the blocking steel plate 13 corresponding to the first blocking interval 111 is substantially the same as the deformation shape of the blocking steel plate 13 corresponding to the adjacent second blocking interval 122.

[0046] It should be noted that, in other embodiments, the projection of the transverse steel plate 15 in the second limiting interval 122 in the first direction B may also overlap with the projection of multiple transverse steel plates 15 in the first limiting interval 111 in the first direction B.

[0047] In addition, in this embodiment, the distance between the two transverse steel plates 15 in the first blocking interval 111 and the transverse steel plates 15 in the second blocking interval 122 is the same. In other words, the distance between the two transverse steel plates 15 in the first blocking interval 111 is directly opposite to the transverse steel plates 15 in the second blocking interval 122, so as to further improve the stability of the transverse steel plates 15 in stably transmitting and guiding the bending deformation of the blocking steel plates 13.

[0048] Furthermore, the distances between the transverse steel plates 15 in the plurality of second blocking intervals 122 and the first connecting steel plate 11 are the same. In other words, the plurality of transverse steel plates 15 in the plurality of second blocking intervals 122 are arranged continuously in a line, such as Figure 2 As shown, the stability of the cross-section steel plate 15 in stably transmitting and guiding the bending deformation of the limiting steel plate 13 is further improved.

[0049] Please continue reading Figure 2 and Figure 3 The support limiter 10 may include a plurality of first connecting steel plates 11 and a plurality of second connecting steel plates 12, wherein the plurality of first connecting steel plates 11 are connected in sequence, and two adjacent first connecting steel plates 11 are butted and welded. The plurality of second connecting steel plates 12 are also connected in sequence, and two adjacent second connecting steel plates 12 are butted and welded. Thus, the support limiter 10 forms a continuous longitudinal beam in the longitudinal direction of the tunnel.

[0050] It should be noted that the support limiter 10 may also include a welding steel bar 16, which is disposed at the joint position of two adjacent first connecting steel plates 11 and is welded and connected to the two first connecting steel plates 11 to improve the stability of the connection. Of course, the welding steel bar 16 may also be disposed at the joint position of two adjacent second connecting steel plates 12 and is welded and connected to the two second connecting steel plates 12 to improve the stability of the connection between the second connecting steel plates 12. The integrity of the support limiter 10 is further enhanced.

[0051] Please continue reading Figure 1 and Figure 2 For the initial support structure 100, multiple steel frames 20 are connected in sequence and are used to be arranged along the circumference of the tunnel. The support limiter 10 is arranged between two adjacent steel frames 20, and the first connecting steel plate 11 and the second connecting steel plate 12 are respectively connected to the respective ends of the two steel frames 20, so that the support limiter 10 can adapt to the deformation of the tunnel periphery and provide a more stable support structure for the tunnel.

[0052] Furthermore, the initial support structure 100 may also include a connection support 30, which is connected to the end of the steel frame 20 and is connected to the first connection steel plate 11 to connect the steel frame 20 and the first connection steel plate 11. This makes the connection position area of ​​the steel frame 20 and the first connection steel plate 11 larger, avoiding excessive local force on the first connection steel plate 11. Of course, the second connection steel plate 12 can also be connected to the end of the steel frame 20 through the connection support 30.

[0053] It should be noted that the connecting support 30 can be connected to the first connecting steel plate 11 or the second connecting steel plate 12 by connecting bolts to improve the convenience of assembly. In addition, the connecting support 30 can also be connected to the steel frame 20 by connecting the angle steel 40, such as Figure 2 In addition, the steel frame 20 can be an I-shaped steel or an H-shaped steel, so that the connection area of ​​the connection position between the steel frame 20 and the first connecting steel plate 11 is larger.

[0054] Furthermore, the initial support structure 100 may also include a steel mesh 50, which is connected to the steel frame 20 and the first connecting steel plate 11, respectively, so that the shotcrete is stably solidified in the grid surrounded by the steel frame 20 and the first connecting steel plate 11, so that the first connecting steel plate 11, the steel frame 20 and the shotcrete form a whole, wherein the shotcrete is the primary support concrete 60. Of course, the steel mesh 50 may also be connected to the steel frame 20 and the second connecting steel plate 12, respectively. In addition, the number of steel mesh sheets 50 can be multiple, and two steel mesh sheets 50 are arranged at intervals, and are respectively connected to the two edges of the first connecting steel plate 11 close to and away from the tunnel wall, and are also respectively connected to the two edges of the steel frame 20 close to and away from the tunnel wall; in other words, there are two steel mesh sheets 50 in the grid surrounded by the steel frame 20 and the first connecting steel plate 11, which are respectively welded to the two flanges of the steel frame 20, and are also connected to the two sides of the first connecting steel plate 11 in the radial direction of the tunnel, so as to increase the bonding strength and integrity between the steel frame 20, the support limiter 10 and the shotcrete.

[0055] During construction, stress analysis can be performed based on basic data such as on-site geology and support parameters, and combined with feedback from conventional on-site support construction, the transverse support limiter 10 can be set at the key stress deformation position in the initial support structure 100. Double or multi-layer transverse diaphragm steel plates 15 are used at the connection between the support limiter 10 and the steel frame 20, and a single-layer transverse diaphragm steel plate 15 can be used for the remaining support limiter 10, so that the deformation direction from the transverse diaphragm steel plate 15 to the induced limiter is consistent, thereby ensuring the constant resistance performance and effective compression rate of the support limiter 10, and matching the stiffness distribution of the support limiter 10 with the longitudinal stiffness distribution of the initial support structure 100, so that the support limiter 10 deforms in a coordinated manner along the longitudinal direction to avoid circumferential cracks. After the compression deformation of the support limiter 10 converges and stabilizes or the compression deformation reaches the designed stroke, the support limiter 10 can be closed by spraying concrete to form a primary support structure with support strength and stiffness not lower than that of conventional support, which can ensure the structural safety during the operation period after the secondary lining construction.

[0056] The working principle of the support limiter 10 provided in the embodiment of the present invention is:

[0057] The support limiter 10 includes a first connecting steel plate 11, a second connecting steel plate 12, a plurality of limiter steel plates 13 and a plurality of transverse diaphragm steel plates 15, wherein the first connecting steel plate 11 and the second connecting steel plate 12 are arranged in parallel, and are both used to extend along the longitudinal direction of the tunnel and connected to the steel frame 20 of the initial support structure 100. The plurality of limiter steel plates 13 are sequentially arranged between the first connecting steel plate 11 and the second connecting steel plate 12, and the two ends of the limiter steel plate 13 are respectively connected to the first connecting steel plate 11 and the second connecting steel plate 12 to support the first connecting steel plate 11 and the second connecting steel plate 12. A plurality of transverse steel plates 15 are respectively arranged between two adjacent limiting steel plates 13, and are respectively connected to the corresponding two limiting steel plates 13. In this way, the side surfaces of the limiting steel plates 13 are connected by the plurality of transverse steel plates 15, so that the bending direction of the limiting steel plates 13 is deformed and induced by the transverse steel plates 15, so that the bending deformation of the plurality of limiting steel plates 13 is along one direction, thereby reducing the probability of the bending direction of the limiting steel plates 13 being randomly generated during the stress deformation process, and further reducing the probability of collision and superposition between the limiting steel plates 13, so as to keep the resistance value of the support limiting resistor 10 constant, avoid the occurrence of secondary peaks, and increase the effective compression stroke of the support limiting resistor 10. In addition, the bending deformation of the limiting steel plates 13 will also be transmitted to the adjacent limiting steel plates 13 through the transverse steel plates 15, so that the deformation amplitudes of the limiting steel plates 13 at different positions on the supporting limiting resistor 10 are roughly the same, so that the overall deformation is relatively uniform, and the primary support concrete 60 is not prone to circumferential cracks.

[0058] In summary:

[0059] The embodiment of the present invention provides a support limiter 10, which has the characteristics of controllable deformation and relatively uniform deformation.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the features in the above embodiments can be combined with each other without conflict, and the present invention can also have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. In addition, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A support limiter, characterized in that: It comprises a first connecting steel plate (11), a second connecting steel plate (12), a plurality of resistance-limiting steel plates (13) and a plurality of transverse diaphragm steel plates (15); The first connecting steel plate (11) and the second connecting steel plate (12) are arranged in parallel and are used to extend along the longitudinal direction of the tunnel and are connected to the steel frame (20) of the initial support structure (100); a plurality of the resistance limiting steel plates (13) are arranged in sequence and spaced apart between the first connecting steel plate (11) and the second connecting steel plate (12), and the two ends of the resistance limiting steel plate (13) are respectively connected to the first connecting steel plate (11) and the second connecting steel plate (12); a plurality of the transverse diaphragm steel plates (15) are respectively arranged between two adjacent resistance limiting steel plates (13) and are respectively connected to the corresponding two resistance limiting steel plates (13); The interval between the resistance-limiting steel plates (13) corresponding to the steel frame (20) is a first resistance-limiting interval (111), and the interval between two adjacent resistance-limiting steel plates (13) at other positions is a second resistance-limiting interval (122); At least one of the transverse steel plates (15) is arranged in the second blocking interval (122), the number of the transverse steel plates (15) in the first blocking interval (111) is greater than the number of the transverse steel plates (15) in the second blocking interval (122), and the transverse steel plates (15) in the same first blocking interval (111) or the second blocking interval (122) are arranged at intervals; There are two transverse steel plates (15) in the first blocking interval (111), and the projection of the transverse steel plate (15) in the second blocking interval (122) in the first direction (B) is located between the projections of the two transverse steel plates (15) in the first blocking interval (111) in the first direction (B); wherein the first direction (B) is the extension direction of the first connecting steel plate (11).

2. The support limiter according to claim 1, characterized in that: The two transverse steel plates (15) in the first blocking interval (111) are each at the same distance from the transverse steel plate (15) in the second blocking interval (122).

3. The support limiter according to claim 1, characterized in that: The distances between the transverse steel plates (15) in the plurality of the second limiting intervals (122) and the first connecting steel plates (11) are the same.

4. The support limiter according to any one of claims 1 to 3, characterized in that: The support and limiting device comprises a plurality of the first connecting steel plates (11) and a plurality of the second connecting steel plates (12); A plurality of the first connecting steel plates (11) are connected in sequence, and two adjacent first connecting steel plates (11) are butt-jointed and welded together; a plurality of the second connecting steel plates (12) are connected in sequence, and two adjacent second connecting steel plates (12) are butt-jointed and welded together.

5. The support limiter according to claim 4, characterized in that: The support limiter also includes a welding steel bar (16), which is arranged at the joint position of two adjacent first connecting steel plates (11) and is welded to the two first connecting steel plates (11).

6. An initial support structure, characterized in that: It comprises a plurality of steel frames (20) and a support and limiting device as claimed in any one of claims 1 to 5; A plurality of the steel frames (20) are connected in sequence and are used to be arranged along the circumference of the tunnel, the support limiter is arranged between two adjacent steel frames (20), and the first connecting steel plate (11) and the second connecting steel plate (12) are respectively connected to the respective ends of the two steel frames (20).

7. The initial support structure according to claim 6, characterized in that: The initial support structure also includes a connecting support (30), which is connected to the end of the steel frame (20) and connected to the first connecting steel plate (11) to connect the steel frame (20) and the first connecting steel plate (11).

8. The initial support structure according to claim 6, characterized in that: The initial support structure further comprises a steel mesh (50), wherein the steel mesh (50) is respectively connected to the steel frame (20) and the first connecting steel plate (11).

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