Assembly type yielding anchor rod suitable for soft rock large deformation tunnel support and working method

Abstract

The application relates to an assembled yielding anchor rod suitable for soft rock large deformation tunnel support and a working method, which comprises a multi-stage anchor rod body capable of being detachably connected through a yielding component, wherein, except for the anchor rod bodies at the two ends, each stage of the anchor rod bodies comprises an expansion rod, one end of the expansion rod is provided with a threaded rod, the other end is provided with a connecting disc and a sealing disc arranged side by side on the expansion rod; the yielding component comprises an upper sleeve and a lower sleeve connected together, the inside of the upper sleeve is connected with the threaded rod, the inner wall surface of the lower sleeve is provided with a slide way matched with the connecting disc, and the end surface of the slide way is provided with a flange disc matched with the sealing disc. After the anchor rod body at the next stage is connected with the yielding component through the flange, the anchor rod body can move in the lower sleeve of the yielding component within a certain range of axial movement, the yielding function is realized, the required yielding amount is adjusted, compared with the current spring and similar structures, the structure is simple, flexible and variable, and the stability is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering support, in particular to an assembled yielding anchor rod suitable for soft rock large deformation tunnel support and a working method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] In the process of supporting the soft rock large deformation tunnel, the deformation of the surrounding rock will cause the current "forced hard top" support structure to bear excessive deformation pressure. The solution is to have a certain deformation capacity while maintaining a certain resistance of the support structure to release part of the deformation pressure, forming a yielding anchor rod.

[0004] However, the yielding anchor rod also has problems. Some yielding anchor rods have small yielding amount and cannot change the yielding amount by self-assembly. The other part of the yielding anchor rod realizes the yielding function through a spring or other complex structure. The resistance of such structure is small, and the stability is poor after the yielding stroke is completed. The complex yielding structure cannot meet the needs of assembly and installation on the construction site, and cannot easily achieve the purpose of increasing or decreasing the yielding amount. SUMMARY

[0005] In order to solve the technical problems in the background art, the present application provides an assembled yielding anchor rod suitable for soft rock large deformation tunnel support and a working method. The multi-stage anchor rod body is connected by a yielding member. The number of each stage of anchor rod body is adjusted according to the actual needs on site. The upper stage of anchor rod body is connected to the yielding member in a threaded connection manner to realize the length adjustment of each stage of anchor rod body. The lower stage of anchor rod body is connected to the yielding member through a flange to realize the axial movement in the lower sleeve of the yielding member, adjust the required yielding amount, and realize the yielding function. Compared with the current spring and similar structure, the structure is simple, flexible and variable, and has better stability.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The first aspect of the present application provides an assembled yielding anchor rod for soft rock large deformation tunnel support, which comprises a multi-stage anchor rod body connected by a yielding member. Except for the anchor rod bodies at the two ends, each stage of anchor rod body comprises an extension rod, one end of which has a threaded rod, and the other end has a connecting disc and a sealing disc arranged side by side on the extension rod. The yielding member comprises an upper sleeve and a lower sleeve connected together. The inner part of the upper sleeve is connected with the threaded rod. The inner wall surface of the lower sleeve is provided with a sliding channel matched with the connecting disc. The end surface of the sliding channel is provided with a flange disc matched with the sealing disc.

[0008] Further, the anchor rod body at the head end has an end anchor head connected to one end of the telescopic rod, and the end anchor head is exposed from the rock-soil body after the supporting operation is completed.

[0009] Further, the anchor rod body at the tail end has a front end rod body connected to one end of the telescopic rod, and the front end rod body is used for being punched into the rock-soil body.

[0010] Further, the diameter of the connecting disc is not greater than that of the sealing disc, the outer side of the circumference of the connecting disc is provided with a protrusion, and the protrusion is matched with the slide way of the inner wall surface of the lower sleeve.

[0011] Further, the upper sleeve and the lower sleeve are sleeved together to form a connecting sleeve, and the connecting sleeve connects the two adjacent anchor rod bodies.

[0012] Further, the outer diameter of the lower sleeve is not less than that of the upper sleeve, and the cavity for accommodating the filler is arranged between the inner side of the outer wall of the lower sleeve and the outer side of the upper sleeve.

[0013] Further, the inner surface of the upper sleeve is provided with an internal thread, which is used for being matched and connected with the threaded rod at the tail end of the anchor rod body of the upper level.

[0014] Further, the inner wall surface of the lower sleeve is provided with a slide way matched with the protrusion at the outer side of the circumference of the connecting disc, a plurality of slide ways are uniformly arranged along the axis of the lower sleeve, and when the connecting disc is located in the lower sleeve, the connecting disc and the telescopic rod can be axially moved in the connecting sleeve through the matching of the protrusion and the slide way.

[0015] Further, the end surface of the inner wall surface of the lower sleeve is provided with a flange plate, and after the fastener passes through the sealing disc and the flange plate, the connection between the anchor rod body of the lower level and the lower sleeve is realized.

[0016] Further, the middle part of the sealing disc is provided with a hole with a diameter not less than the outer diameter of the telescopic rod.

[0017] The second aspect of the present application provides a working method of the pressure-relief anchor rod, which comprises the following steps:

[0018] The connecting disc of the anchor rod body of the first level is inserted into the lower sleeve, the protrusion at the outer side of the circumference of the connecting disc is clamped into the slide way of the inner wall surface of the lower sleeve, the movement of the connecting disc in the lower sleeve is guided, the fastener passes through the sealing disc and the flange plate on the lower sleeve, the lower sleeve and the anchor rod body of the first level are connected together, and the connection between the connecting sleeve and the anchor rod body of the first level is realized.

[0019] The threaded rod of the anchor rod body of the second level is inserted into the upper sleeve, the threaded rod is matched with the thread on the inner surface of the upper sleeve, the anchor rod body of the second level and the upper sleeve are connected together, and the connection between the connecting sleeve and the anchor rod body of the second level is realized.

[0020] Repeat the above steps, by setting the number of connecting sleeve in turn connecting the required each level of anchor rod body, until the formation of the complete let pressure anchor rod.

[0021] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0022] 1、Let pressure anchor rod through multi-stage anchor rod body formed can be assembled structure, assembly is completed after the connecting disc of next level anchor rod body in the inner wall surface of lower sleeve, so that the telescopic rod piece moves along the axial direction, when the surrounding rock occurs large deformation, can realize let pressure function, and in the assembly, using the above axial movement can adjust the let pressure between the adjacent two levels of anchor rod body, no longer rely on spring or factory prefabricated complex structure, so that the overall structure is simple, the on-site assembly is more flexible and can change the number of anchor rod body according to the actual demand.

[0023] 2、The length of each level of anchor rod body can be adjusted by the threaded connection between the connecting sleeve and the upper level of anchor rod body, thereby changing the overall length of the let pressure anchor rod, realizing flexible assembly on site, and meeting different needs during on-site assembly.

[0024] 3、The filler in the inner cavity of the lower sleeve is compressed when the let pressure anchor rod is stressed, the pore volume is reduced, and as the resistance of the telescopic rod piece becomes larger and larger, the filler is finally compressed to an incompressible state, and the let pressure reaches the maximum. Compared with similar structures such as springs, the long-term working stability is higher, and the spring will not lose stability in other directions under the condition of ultimate compression. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description, explain the application. The specific embodiments of the application and its explanation are not intended to be an improper limitation of the application.

[0026] Fig. 1 The let pressure anchor rod overall structure schematic diagram provided for one or more embodiments of the application;

[0027] Fig. 2 The let pressure anchor rod disassembly structure schematic diagram provided for one or more embodiments of the application;

[0028] Fig. 3 The structure schematic diagram of the anchor rod end of the let pressure anchor rod provided for one or more embodiments of the application;

[0029] Fig. 4 The structure schematic diagram of the let pressure anchor rod connecting member provided for one or more embodiments of the application;

[0030] Fig. 5 The structure schematic diagram of the let pressure anchor rod connecting sleeve provided for one or more embodiments of the application;

[0031] Fig. 6 The assembly process schematic diagram of the yielding anchor rod provided for one or more embodiments of the present application;

[0032] In the figure: 1-end anchor head, 2-anchor rod body, 3-yielding component, 4-front end rod body, 5-threaded rod, 6-connection sleeve, 7-telescopic rod, 8-sealing disc, 9-upper sleeve, 10-lower sleeve, 11-flange plate, 12-slide. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and embodiments.

[0034] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0035] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component, and / or combinations thereof.

[0036] As described in the background, for soft rock large deformation tunnel support, part of the yielding amount of the yielding anchor rod used in the prior art is small, and the yielding amount cannot be changed by self-assembly; another part of the yielding anchor rod realizes the yielding function through a spring or other complex structure, the resistance of such structure is small, and the stability is poor after the yielding stroke is completed, the complex yielding structure cannot meet the needs of assembly and installation on site, and the purpose of increasing or decreasing the yielding amount cannot be achieved more conveniently.

[0037] Therefore, the following embodiments give an assembled yielding anchor rod suitable for soft rock large deformation tunnel support, the yielding component is used to connect the first and last ends of the multi-stage anchor rod body, the number of each stage anchor rod body is adjusted according to the actual needs on site, the upper stage anchor rod body is connected to the yielding component in a threaded manner, the length of each stage anchor rod body is adjustable, and the lower stage anchor rod body can move axially within the lower sleeve of the yielding component after being connected to the yielding component through the flange, thereby realizing the yielding function and adjusting the required yielding amount. Compared with the current spring and similar structures, the structure is simple, flexible and variable, and the stability is better.

[0038] Embodiment one:

[0039] As Figs. 1-6As shown, the assembled yielding anchor rod suitable for soft rock large deformation tunnel support includes multi-stage anchor rod bodies connected by a yielding component, and each stage of the anchor rod bodies, except the first and last anchor rod bodies, includes an extension rod with a threaded rod at one end and a connecting disc and a sealing disc arranged side by side at the other end; the yielding component includes an upper sleeve and a lower sleeve connected together, the inner part of the upper sleeve is connected with the threaded rod, and the inner wall surface of the lower sleeve is provided with a slide corresponding to the connecting disc, and the end surface of the slide is provided with a flange disc connected with the sealing disc.

[0040] The anchor rod body at the first end has an end anchor head, and the end anchor head is exposed from the rock-soil body after the support operation is completed. In this embodiment, the 5-threaded rod at the end of the anchor rod body at the first end is replaced by the end anchor head.

[0041] The anchor rod body at the tail end has a front end rod body for being punched into the rock-soil body. In this embodiment, the connecting disc and the sealing disc of the anchor rod body at the tail end are replaced by the front end rod body.

[0042] As shown in the drawings, Figs. 1-3 In this embodiment, the four groups of anchor rod bodies 2 are connected end to end to form a complete yielding anchor rod, and the yielding function is realized by the yielding component 3 connecting the groups of anchor rod bodies 2 end to end. The end anchor head 1 is at one end of the first-stage anchor rod body 2, and the front end rod body 4 is at one end of the fourth-stage anchor rod body 2.

[0043] In addition to the first and last anchor rod bodies 2, each stage of the anchor rod bodies 2 includes a threaded rod 5 at the tail end and a connecting disc and a sealing disc 8 arranged at the top end.

[0044] As shown in the drawings, Figs. 4-5 The connecting disc is circular, and the diameter is not greater than that of the sealing disc 8. The outer side of the circumference of the connecting disc is provided with a plurality of protrusions.

[0045] The upper sleeve 9 and the lower sleeve 10 are sleeved together to form a connecting sleeve 6, and the connecting sleeve 6 connects the adjacent two stages of the anchor rod bodies 2.

[0046] The outer diameter of the lower sleeve 10 is not less than that of the upper sleeve 9, so that a cavity is formed between the inner side of the outer wall of the lower sleeve 10 and the outer side of the upper sleeve 9 for accommodating the filler.

[0047] The inner surface of the upper sleeve 9 is provided with an internal thread for connecting with the threaded rod 5 at the tail end of the upper-stage anchor rod body 2.

[0048] The inner wall surface of the lower sleeve 10 is provided with a plurality of slides 12 corresponding to the protrusions on the outer side of the circumference of the connecting disc, and the plurality of slides 12 are uniformly arranged along the axis of the lower sleeve 10, so that when the connecting disc is located inside the lower sleeve 10, the axial movement can be realized by the cooperation of the protrusions and the slides.

[0049] The end face of the inner wall surface of the lower sleeve 10 is provided with a flange plate 11, and after the fastener passes through the sealing plate 8 and the flange plate 11, the connection between the next level anchor rod body 2 and the lower sleeve 10 is realized.

[0050] The middle part of the sealing plate 8 is provided with a hole with a diameter not less than the outer diameter of the telescopic rod 7, which can accommodate the axial movement of the telescopic rod 7 through the sealing plate 8.

[0051] In this embodiment, after the telescopic rod 7 passes through the hole in the middle of the sealing plate 8, the top has a connecting plate, which is a circular member with a protrusion around it that can be clamped into the internal groove (slide 12) of the connecting sleeve 6 and slide along it, ensuring the axial relative sliding between the rods; The lower part of the connecting sleeve 6 has a flange plate 11, and after the circular member at the top of the telescopic rod is inserted into the internal groove of the connecting sleeve 6 and clamped to make it slide up and down, the sealing plate 8 can be tightly coupled with the flange plate 11, and the assembly of the yielding component is realized through the pre-tightening force of the bolt.

[0052] Example two:

[0053] The yielding anchor rod with the above structure can be assembled on site during use. Taking the four-level anchor rod body 2 in this embodiment as an example:

[0054] As shown in Fig. 6 , the connecting plate at the first end of the first level anchor rod body 2 is inserted into the lower sleeve 10, and the protrusion on the outer side of the connecting plate is used to guide the movement direction of the connecting plate in the lower sleeve 10 by cooperating with the slide 12 on the inner wall surface of the lower sleeve 10. The lower sleeve 10 and the first end of the first level anchor rod body 2 are connected together by using the fastener to pass through the sealing plate 8 and the flange plate 11 on the end surface of the lower sleeve 10.

[0055] After the connection is completed, the second level anchor rod body 2 tail end is inserted into the upper sleeve 9, and the tail end threaded rod 5 is connected with the upper sleeve 9 inner surface through the threaded cooperation, so that the second level anchor rod body 2 tail end and the upper sleeve 9 are connected together.

[0056] Since the upper sleeve 9 and the lower sleeve 10 are sleeved together to form the connecting sleeve 6, the above actions connect the adjacent two levels of anchor rod bodies 2 through the connecting sleeve 6, and by repeating the above steps, each subsequent level of anchor rod body 2 is connected in turn, until a complete yielding anchor rod is formed.

[0057] After the assembly is completed, the connecting plate of the next level anchor rod body 2 slides along the slide 12 on the inner wall surface of the lower sleeve 10 through the protrusion on the outer side of the connecting plate, so that the telescopic rod 7 moves in the axial direction and can only move in this direction. At the same time, the hole in the middle of the sealing plate 8 provides space for the axial movement of the telescopic rod 7. When the surrounding rock deforms greatly, the relative movement between the telescopic rod 7 and the connecting sleeve 6 can realize the yielding function, and the above structure can adjust the yielding amount between the adjacent two levels of anchor rod bodies 2 during assembly.

[0058] At the same time, the length of the yielding anchor rod can be adjusted by the threaded connection between the connecting sleeve 6 and the upper anchor rod body 2, so that the on-site flexible assembly is realized.

[0059] The filler (for example, sand) in the inner cavity of the lower sleeve 10 is compressed when the yielding anchor rod is stressed, the pore volume is reduced, and the resistance to the telescopic rod 7 becomes larger and larger. Finally, the sand is compressed to an incompressible state, and the yielding amount reaches the maximum.

[0060] According to The yielding amount can be calculated as ΔH=H1-H2, wherein e1 is the sand pore ratio, e cr is the critical pore ratio of the sand, which is defined as the pore ratio under the condition that the pore water pressure is zero in the consolidated undrained test.

[0061] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An assembled yielding anchor rod suitable for soft rock large deformation tunnel support, characterized in that: The multi-stage anchor rod body including detachable connection through the pressure relief component, in addition to the first and last ends of the anchor rod body, the rest of the anchor rod body includes telescopic rod, one end of the telescopic rod has a threaded rod, the other end has a connecting disc and a sealing disc arranged on the telescopic rod; the pressure relief component includes an upper sleeve and a lower sleeve connected together, the inside of the upper sleeve is connected with the threaded rod, the inner wall surface of the lower sleeve is provided with a slide way matched with the connecting disc, and the end surface of the slide way is provided with a flange disc matched with the sealing disc; According to the actual needs of the site, the number of each stage anchor rod body is adjusted, the upper stage anchor rod body is connected with the pressure relief component in a threaded connection mode, the length of each stage anchor rod body is adjustable, and the lower stage anchor rod body can move in the lower sleeve of the pressure relief component in a certain range of axial movement after being connected with the pressure relief component through the flange disc; The outer diameter of the lower sleeve is not less than that of the upper sleeve, and the cavity between the inner side of the outer wall of the lower sleeve and the outer side of the upper sleeve can accommodate the filler, and the filler in the inner cavity of the lower sleeve is compressed when the pressure relief anchor rod is stressed, and the pore volume is reduced; The diameter of the connecting disc is not greater than that of the sealing disc, and the outer side of the circumference of the connecting disc is provided with a protrusion matched with the slide way of the inner wall surface of the lower sleeve; The inner wall surface of the lower sleeve is provided with a slide way matched with the protrusion of the outer side of the circumference of the connecting disc, and a plurality of slide ways are evenly arranged along the axis of the lower sleeve, and when the connecting disc is located in the lower sleeve, the connecting disc can move axially in the connecting sleeve together with the telescopic rod through the cooperation of the protrusion and the slide way; The upper sleeve and the lower sleeve are sleeved together to form a connecting sleeve, and the connecting sleeve connects two adjacent stage anchor rod bodies; The end surface of the inner wall surface of the lower sleeve is provided with a flange disc, and after the fastener passes through the sealing disc and the flange disc, the connection between the lower stage anchor rod body and the lower sleeve is realized.

2. The assembled yielding anchor rod suitable for soft rock large deformation tunnel support according to claim 1, characterized in that: The anchor rod body at the first end has an end anchor head connected to one end of the telescopic rod, and the end anchor head is exposed from the rock-soil body after the support operation is completed; the anchor rod body at the tail end has a front end rod body connected to one end of the telescopic rod, and the front end rod body is used for punching into the rock-soil body.

3. The assembled yielding anchor rod suitable for soft rock large deformation tunnel support according to claim 1, characterized in that: The inner surface of the upper sleeve is provided with an internal thread for matching and connecting with the threaded rod at the tail end of the upper stage anchor rod body.

4. The assembled yielding anchor rod suitable for soft rock large deformation tunnel support according to claim 1, characterized in that: The middle part of the sealing disc is provided with a hole with a diameter not less than the outer diameter of the telescopic rod.

5. Method for working a yielding anchor rod according to any one of claims 1-4, characterized in that: The method comprises the following steps: The connecting disc of the first stage anchor rod body is inserted into the lower sleeve, the protrusion on the outer side of the circumference of the connecting disc is clamped into the slide way of the inner wall surface of the lower sleeve, the connecting disc is guided to move in the lower sleeve, the fastener passes through the sealing disc and the flange disc on the lower sleeve to connect the lower sleeve and the first stage anchor rod body together, and the connection between the connecting sleeve and the first stage anchor rod body is realized; The threaded rod of the second stage anchor rod body is inserted into the upper sleeve, and the second stage anchor rod body is connected with the upper sleeve through the cooperation of the threaded rod and the thread on the inner surface of the upper sleeve, so that the connection between the connecting sleeve and the second stage anchor rod body is realized; The above steps are repeated, and a certain number of connecting sleeves are connected with each stage anchor rod body in turn until a complete pressure relief anchor rod is formed.

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