Corrugated sheet structure and tunnel support assembly using the corrugated sheet structure, construction method

Abstract

This invention relates to the field of tunnel support technology, specifically to a corrugated plate structure for tunnel support, a tunnel support assembly having the corrugated plate structure, and a construction method thereof. The structure includes multiple corrugated plate bodies connected to each other; each corrugated plate body includes multiple individual corrugated plates connected to each other. This invention discloses a corrugated plate structure for tunnel support. Through the structural design of segmented corrugated plate bodies and individual corrugated plates, this invention facilitates the assembly and connection of the corrugated plate structure.

Description

Technical Field

[0001] This invention relates to the field of tunnel support technology, specifically to a corrugated plate structure for tunnel support, a tunnel support assembly having the corrugated plate structure, and a construction method for the tunnel support assembly. Background Technology

[0002] Regarding the initial support of tunnels, traditional shotcrete and anchor initial support has low construction efficiency and the support strength cannot meet the requirements in a short period of time. The use of prefabricated assembled corrugated steel plate components can solve this problem better.

[0003] Corrugated steel sheets have advantages such as being lightweight, high-strength, and easy to assemble, and can be supported as excavation progresses, meeting the requirements of "rapid excavation and rapid closure" for tunnels.

[0004] Currently, there are several problems that urgently need to be solved when using prefabricated corrugated steel plate components as initial support:

[0005] 1. The inconsistent assembly methods between individual corrugated sheets are not conducive to improving the assembly efficiency of steel corrugated sheets; at the same time, the inconsistent structure of traditional individual corrugated sheets also results in low assembly efficiency.

[0006] 2. At the same time, due to the presence of over-excavation and under-excavation in the surrounding rock of the tunnel, it is impossible to guarantee the flatness and smoothness of the tunnel excavation outline. Therefore, it is difficult to determine the installation position when assembling the corrugated steel plates.

[0007] 3. Since the steel corrugated plate components are usually connected longitudinally along the tunnel direction by bolts, when the surrounding rock deformation is large, the joints of the steel corrugated plates are prone to damage, affecting the overall stability of the support structure.

[0008] Therefore, in order to at least solve or improve the above problem, it is necessary to optimize the design of the existing corrugated plate support structure. Summary of the Invention

[0009] The purpose of this invention is to provide a corrugated plate structure that is easy to assemble.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A corrugated plate structure for tunnel support includes multiple corrugated plate bodies connected to each other; each corrugated plate body includes multiple individual corrugated plates connected to each other.

[0012] Each of the individual corrugated plates includes a substrate, and two opposing longitudinal plates are provided at the edge of the substrate.

[0013] Two horizontal longitudinal plates are also provided at the edge of the substrate; the two horizontal longitudinal plates are connected to the two vertical longitudinal plates in sequence; the two horizontal longitudinal plates and the two vertical longitudinal plates form a U-shaped structure.

[0014] The horizontal projection length of the substrate is not less than the longitudinal length of the corresponding single corrugated board.

[0015] A pressure relief mechanism is provided between adjacent corrugated plates.

[0016] The pressure relief mechanism includes a pressure relief component; the pressure relief component includes an outer ring, and a support pad is provided inside the outer ring.

[0017] A tunnel support assembly includes a support structure, the support structure comprising a plurality of rigid positioning beams, the corrugated plate structure being provided on the rigid positioning beams.

[0018] There should be at least one corrugated plate between adjacent rigid positioning beams.

[0019] A construction method for the tunnel support assembly, the construction method comprising the following steps:

[0020] S1: Excavate the tunnel according to the designed cross-sectional dimensions, and perform initial shotcreting on the surrounding rock after excavation;

[0021] S2: Erect a rigid positioning beam and connect each corrugated plate to the rigid positioning beam in the longitudinal direction using longitudinal connecting bolts;

[0022] S3: Fill the space between the corrugated plate structure and the initial shotcrete layer with concrete;

[0023] S4: When the filling concrete in step S3 has reached a certain strength, install the pressure-relief prestressed anchor rods and pressure-relief prestressed anchor cables according to the deformation of the surrounding rock.

[0024] S5: After the deformation of the tunnel support structure has basically stabilized, pour concrete for secondary lining.

[0025] S6: After S5 is completed, the construction of a tunnel support assembly is finished. If the construction of the tunnel support assembly needs to be repeated, S1-S5 above can be repeated.

[0026] In S2, each corrugated plate body includes multiple individual corrugated plates. When adjacent individual corrugated plates are connected, they are connected by butt joint or overlap.

[0027] The advantages of this invention are:

[0028] This invention discloses a corrugated plate structure for tunnel support. The invention facilitates the assembly and connection of the corrugated plate structure through the structural design of segmented corrugated plate body and single corrugated plate.

[0029] In addition, the present invention discloses a tunnel support assembly; by setting a rigid positioning beam, it facilitates the precise installation of the corrugated plate structure during construction, and greatly reduces the construction difficulty of the corrugated plate structure. Attached Figure Description

[0030] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0031] Figure 1 A schematic diagram of the cross-sectional structure of the tunnel support assembly for the invention.

[0032] Figure 2 for Figure 1 A schematic diagram of the longitudinal section of the AA.

[0033] Figure 3 This is a partial splicing diagram of the corrugated plate body containing the pressure relief member involved in the present invention.

[0034] Figure 4 This is a schematic diagram of a partial annular overlap of a corrugated plate body without a pressure relief member, as per the present invention.

[0035] Figure 5 This is a schematic diagram of the corrugated plate body of the transverse longitudinal plate involved in the present invention.

[0036] Figure 6 This is a schematic diagram of the corrugated plate body without transverse longitudinal plates involved in the present invention.

[0037] Figure 7 This is a top view of the pressure relief component in this invention.

[0038] The markings in the above figures are all:

[0039] In the diagram: 1. Surrounding rock; 2. Corrugated plate; 21. Longitudinal plate; 22. Transverse plate; 23. Anchor cable hole; 24. Anchor bolt hole; 25. Grouting hole; 26. Longitudinal bolt hole; 27. Circumferential bolt hole; 28. Circumferential lap bolt hole; 3. Initial support concrete lining; 31. Initial shotcrete; 32. Filling concrete; 4. Pressure relief member; 5. Secondary lining; 6. Pressure relief prestressed anchor cable; 7. Pressure relief prestressed anchor bolt; 8. Rigid positioning beam; 9. Longitudinal connecting bolt; 10. Circumferential connecting bolt. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0041] A corrugated plate structure for tunnel support includes multiple corrugated plate bodies 2, adjacent corrugated plate bodies 2 are connected; each corrugated plate body 2 includes multiple individual corrugated plates 210, adjacent individual corrugated plates 210 are connected; the present invention discloses a corrugated plate structure for tunnel support. The present invention facilitates the assembly and connection of the corrugated plate structure 201 through the structural design of segmented corrugated plate bodies 2 and individual corrugated plates 210.

[0042] Specifically, the corrugated plate structure 201 disclosed in this invention mainly includes multiple corrugated plate bodies 2. The corrugated plate bodies 2 are generally designed as a ring structure. During subsequent construction, multiple corrugated plate bodies 2 are assembled sequentially along the longitudinal direction of the tunnel to form the main structure of the corrugated plate structure 201.

[0043] In addition, each corrugated plate body 2 includes multiple individual corrugated plates 210. The individual corrugated plates 210 are generally arc-shaped, which facilitates the sequential connection of subsequent individual corrugated plates 210 to form a ring-shaped corrugated plate body 2 structure. This structure is easy to place inside the tunnel and plays a good supporting role.

[0044] In actual construction, for the assembly of corrugated panels, after the rigid positioning beam is installed and fixed, the individual corrugated panels can be connected to the rigid positioning beam in sequence to finally assemble the entire corrugated panel. This construction method can ensure that there is no difficulty in determining the installation position of each individual corrugated panel when assembling the corrugated panel. At the same time, the rigid positioning beam of this invention is an I-beam, and the flange of the rigid positioning beam plays a good protective role in subsequent use, avoiding damage at the joint position between adjacent corrugated panels when the surrounding rock deformation is large, which would affect the overall stability of the support structure.

[0045] Through the above design, the corrugated plate structure 201 disclosed in this invention can be assembled as needed, which greatly facilitates the construction and processing of the corrugated plate structure 201.

[0046] Furthermore, in this invention, each of the individual corrugated plates 210 includes a base plate 2-1, and two opposing longitudinal plates 21 are provided at the edge of the base plate 2-1; the base plate 2-1 is a basic connecting plate, and the base plate 2-1 is an arc-shaped plate, which mainly supports and limits the sealing and positioning to reduce the outflow of filling concrete. In addition, the longitudinal plates 21 are provided at the edge of the base plate 2-1, and the longitudinal plates 21 are a connector, which facilitates the subsequent construction. The corrugated plate body 2 can be connected to the connected corrugated plate body 2 through the longitudinal plates 21 or to the adjacent rigid positioning beam 8; the connection and fixing method can be the connection by bolts.

[0047] Furthermore, in this invention, two transverse longitudinal plates 22 are provided at the edge of the substrate 2-1; the two transverse longitudinal plates 22 are connected to the two longitudinal longitudinal plates 21 in sequence; the two transverse longitudinal plates 22 and the two longitudinal longitudinal plates 21 form a U-shaped structure; through the arrangement of the transverse longitudinal plates 22, the individual corrugated plates 210 form a box structure with an opening at the lower end. This arrangement facilitates the docking between adjacent individual corrugated plates 210 during subsequent use, and also facilitates the arrangement and placement of the pressure member 4 during subsequent use.

[0048] Furthermore, in this invention, the horizontal projection length of the substrate 2-1 is not less than the length of the longitudinal plate 21 on the corresponding corrugated plate 210. This design facilitates the docking or overlapping of individual corrugated plates 210. When docking is required, the end face of the substrate 2-1 is required to be flush with the end face of the longitudinal plate 21 to avoid protrusions at the ends of the individual corrugated plates 210 that could affect the docking between adjacent individual corrugated plates 210. When overlapping is required, the substrate 2-1 is required to protrude beyond the longitudinal plate 21, meaning the length of the substrate 2-1 is longer than the length of the longitudinal plate 21. This design prevents the longitudinal plate 21 from affecting the overlapping of adjacent individual corrugated plates 210.

[0049] Furthermore, in this invention, a pressure-relieving mechanism is provided between adjacent corrugated plates 210. This pressure-relieving mechanism provides excellent buffering and protection, facilitating the connection between adjacent corrugated plates 210 and improving the ease of connection. Simultaneously, the pressure-relieving mechanism itself has a certain buffering deformation capacity, thereby providing a certain buffering capacity between adjacent corrugated plates 210, which helps increase the deformation capacity of the corrugated plate body 2.

[0050] Specifically, the pressure-relieving mechanism in this invention includes a pressure-relieving member 4; the pressure-relieving member 4 includes an outer ring 41, which, in actual use, is respectively attached to the ends of adjacent corrugated plates 210 on both sides; in subsequent connections, the outer ring 41 is connected to the adjacent corrugated plates 210 by bolts or other connecting parts. In addition, the outer ring 41 in this invention is provided with a support pad 42; the support pad 42 is an arc-shaped plate structure, and the support pad 42 is arranged inside the outer ring 41. Through this arrangement, the support pad 42 increases the support strength of the pressure-relieving member 4. At the same time, the arc-shaped plate structure of the support pad 42 gives the pressure-relieving member 4 a good self-buffering ability, which greatly increases the self-buffering ability of the corrugated plate 2. This not only facilitates the connection between adjacent corrugated plates 210, but also gives adjacent corrugated plates 210 a certain buffering ability, which is beneficial to increasing the service life of the corrugated plate 2.

[0051] In addition, in this invention, a snap-fit ​​flange 43 is provided at the edge of the outer ring 41, and the pressure-relief member 4 overlaps the end of the adjacent single corrugated plate 210 through the snap-fit ​​flange 43; by setting the snap-fit ​​flange 43, the connection between the outer ring 41 and the adjacent single corrugated plate 210 is increased to a certain extent.

[0052] A tunnel support assembly includes a support structure comprising a plurality of rigid positioning beams 8, wherein the rigid positioning beams 8 are provided with the corrugated plate structure 201; in this invention, the web of the rigid positioning beams 8 is provided with connecting holes, and in subsequent connection, the rigid positioning beams 8 are bolted to the longitudinal plates 21 of the single corrugated plate 210, thereby realizing the connection between the rigid positioning beams 8 and the corrugated plate body 2.

[0053] Furthermore, in this invention, at least one corrugated plate 2 is provided between adjacent rigid positioning beams 8; through this arrangement, this invention not only facilitates the connection between adjacent corrugated plates 2, but also ensures the accuracy of the placement of adjacent corrugated plates 2.

[0054] During actual construction, multiple rigid positioning beams 8 are installed inside the tunnel, with adjacent rigid positioning beams 8 spaced apart. Furthermore, this invention requires that the interval between adjacent rigid positioning beams 8 be determined first.

[0055] A construction method for the tunnel support assembly, the construction method comprising the following steps:

[0056] S1: Excavate the tunnel according to the designed cross-sectional dimensions, and perform initial shotcreting on the excavated surrounding rock 1;

[0057] S2: Erect a rigid positioning beam 8 and connect each corrugated plate 2 to the rigid positioning beam 8 in the longitudinal direction using longitudinal connecting bolts;

[0058] S3: Fill the space between the corrugated plate structure 201 and the initial shotcrete layer with concrete;

[0059] S4: When the filling concrete in step S3 has reached a certain strength, install the pressure-relief prestressed anchor rods and pressure-relief prestressed anchor cables according to the deformation of the surrounding rock 1.

[0060] S5: After the deformation of the tunnel support structure has basically stabilized, pour concrete for secondary lining 5.

[0061] S6: After S5 is completed, the construction of a tunnel support assembly is finished. If the construction of the tunnel support assembly needs to be repeated, S1-S5 above can be repeated.

[0062] The present invention enables the construction operation of the tunnel support assembly through the above-described construction method.

[0063] Furthermore, in S2 of this invention, each corrugated plate body 2 includes multiple individual corrugated plates 210. When adjacent individual corrugated plates 210 are connected, they are connected by butt joint or overlap. By different connection positions of adjacent individual corrugated plates 210, this invention can form two types of corrugated plate bodies 2 in subsequent use, which can be selected as needed in actual production.

[0064] specific;

[0065] The present invention mainly discloses a corrugated plate structure 201 for tunnel support; the corrugated plate structure 201 disclosed in the present invention is mainly a major supporting component of the tunnel support assembly.

[0066] The present invention, through the setting of rigid positioning beam 8, can solve the problems of difficult positioning and easy damage to the longitudinal connection of steel corrugated plates when installing prefabricated steel corrugated plate support structures in deep buried tunnels.

[0067] The rigid positioning beam 8 serves two purposes in this invention. First, it is used for positioning, ensuring the convenience and accuracy of installing the corrugated plate structure 201 during subsequent construction. Second, the rigid positioning beam 8 is an I-beam, which also increases the overall structural strength of the tunnel support assembly to a certain extent. Third, the rigid positioning beam 8 facilitates the sequential connection of multiple corrugated plate bodies 2 along the longitudinal direction of the tunnel, thereby facilitating the connection and assembly between adjacent corrugated plate bodies 2.

[0068] In summary, the present invention uses a rigid positioning beam 8 to determine the position of the corrugated plate structure 201, which has the advantages of fast installation and positioning and high construction efficiency. At the same time, the positioning beam also provides good protection for the longitudinal connection parts of the prefabricated steel corrugated plate, avoiding corrosion of the connecting parts by the filling concrete.

[0069] As shown in the figure, the tunnel support assembly disclosed in this invention mainly includes an initial support concrete lining 3, a corrugated plate 2, a rigid positioning beam 8, a pressure relief component 4, a pressure relief prestressed anchor cable 6, a pressure relief prestressed anchor rod 7, and a secondary lining 5.

[0070] The initial shotcrete 31 is located on the outermost layer of the support structure and is attached to the surrounding rock 1 of the tunnel to level the surrounding rock 1. A rigid positioning beam 8 and a corrugated plate 2 are erected on the inner side of the initial shotcrete 31. The upper flange of the rigid positioning beam 8 is in close contact with the initial shotcrete 31. The gap between the initial shotcrete 31 and the corrugated plate 2 is filled with the corresponding filling concrete 32 later.

[0071] The corrugated plate 2 has the crests and troughs arranged in the same direction as the tunnel depth. The longitudinal end of the corrugated plate 2 is provided with a longitudinal plate 21. The longitudinal plate 21 is provided with longitudinal bolt holes 26. The rigid positioning beam 8 is connected to the corrugated plate 2 by passing longitudinal connecting bolts 9 through the longitudinal bolt holes 26.

[0072] The corrugated plate body 2 has pre-reserved anchor cable holes 23 and anchor rod holes 24. After the steel corrugated plate wall is filled with concrete for a certain period of time, the pressure relief prestressed anchor cables 6 and pressure relief prestressed anchor rods 7 are installed at intervals.

[0073] Secondary lining 5 is applied to the inner side of the corrugated plate 2.

[0074] In practice:

[0075] The corrugated plate 2 can adopt two circumferential connection methods, and the corresponding structural forms of the corrugated plate 2 are as follows: Figure 5 and Figure 6 As shown.

[0076] The first type of loop connection is as follows: Figure 3 As shown, a transverse longitudinal plate 22 is provided at the circumferential end of the corrugated plate 210 body 2. Circumferential bolt holes 27 are drilled on the transverse longitudinal plate 22. Circumferential connecting bolts 10 are used to pass through the circumferential bolt holes 27 to fix the corrugated plate bodies 2 together in a circumferential manner. Pressure relief members 4 are provided between the corrugated plate bodies 2.

[0077] When connecting individual corrugated plates 210 using the above method, multiple [facilities] are required between adjacent individual corrugated plates 210.

[0078] The second type of loop connection is as follows: Figure 4 As shown, adjacent corrugated sheets 210 overlap sequentially, with the corrugated sheet 210 at the top of the arch located at the top, and the corrugated sheets 210 overlapping with the corrugated sheet 210 at the top of the arch located below the corrugated sheet at the top of the arch. The overlapping method is the same as that of roof tiles. Specifically, in implementation, circumferential overlapping bolt holes 28 are drilled at the circumferential ends of adjacent corrugated sheets 210, and circumferential connecting bolts 10 are used to pass through the circumferential overlapping bolt holes 27 to circumferentially overlap the corrugated sheet bodies 2 together. Through this arrangement, the present invention reduces or avoids, to a certain extent, the overflow of subsequent filling concrete through the overlapping points of adjacent corrugated sheets 210.

[0079] The construction method for the above-mentioned prefabricated tunnel support structure includes the following steps:

[0080] Step 1: Excavate the tunnel according to the designed cross-sectional dimensions, and perform initial spraying on the excavated surrounding rock 1 to level and reinforce the surrounding rock 1.

[0081] Step 2: Erect the rigid positioning beam 8 and connect the corrugated steel plate component to the rigid positioning beam 8 in the longitudinal direction using longitudinal connecting bolts;

[0082] Step 3: Connect adjacent corrugated plates 210 using either bolting with transverse longitudinal plates 22 or circumferential lap joint; connect each adjacent corrugated plate 210 sequentially along the circumferential direction; when bolting with transverse longitudinal plates 22 is used, add a pressure relief member 4 between adjacent corrugated plates 210.

[0083] Step 4: Fill the space between the corrugated steel plate component and the initial shotcrete layer with concrete in the order of first arch crown, arch shoulder, arch waist, and invert arch; a reverse grouting method can be used, that is, insert the grouting pipe through the grouting hole 25 between the corrugated plate component and the initial shotcrete layer, and grout while pulling out the pipe to ensure that the grout is fully filled.

[0084] Step 5: When the filling concrete has reached a certain strength, install the pressure relief prestressed anchor rods and pressure relief prestressed anchor cables according to the deformation of the surrounding rock 1.

[0085] Step 6: After the deformation of the support structure has basically stabilized, pour concrete for secondary lining 5 to resist the continuous confining pressure caused by long-term rheology, fragmentation and expansion, and to achieve long-term stability of the support structure.

[0086] The working principle of the tunnel support assembly disclosed in this invention is as follows:

[0087] The tunnel support assembly disclosed in this invention mainly includes a rigid positioning beam 8, a corrugated plate structure 201, and a pressure relief support.

[0088] Among them, the rigid positioning beam 8 has the advantages of mature construction technology and convenient operation. The construction of the rigid positioning beam 8 first can solve the problem of the difficulty in determining the installation position of the corrugated steel plate. At the same time, the rigid positioning beam 8 enhances the overall stability of the prefabricated support structure.

[0089] The beneficial effects of this invention are:

[0090] Convenience: By adding rigid positioning beam 8, not only is the installation position of corrugated plate structure 201 in the tunnel accurate, but the construction difficulty is also reduced.

[0091] Safety: When the corrugated plate structure 201 is used for support, the longitudinal connectors between adjacent corrugated plates 2 are prone to failure due to stress concentration. Adding a rigid positioning beam 8 between adjacent corrugated plates 2 can protect the longitudinal connectors by utilizing the area between the flanges. On the other hand, connecting the steel corrugated plate to the web of the positioning beam can increase the stiffness at the longitudinal connection position and enhance the overall stability of the support structure.

[0092] Multifunctionality: In addition to assisting in the positioning of the corrugated steel plate and protecting the longitudinal connecting parts, the rigid positioning beam 8 can also be used as an end template to seal the grout in the corrugated steel plate.

[0093] In summary, the tunnel support assembly with rigid positioning beam 8 not only fully leverages the advantages of corrugated steel plates, such as good ductility, strong deformation adaptability, and efficient and convenient construction, but also overcomes the shortcomings of traditional corrugated steel plates, such as difficult installation and positioning and difficulty in protecting connecting components. It can shorten the construction period while reducing construction risks and has good economic benefits.

[0094] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A tunnel support assembly, characterized by, The support structure includes multiple rigid positioning beams, and the rigid positioning beams are provided with a corrugated plate structure. The corrugated plate structure includes multiple corrugated plate bodies, which are connected to each other; each corrugated plate body includes multiple individual corrugated plates, which are connected to each other. Each of the individual corrugated plates includes a substrate, and the substrate has two opposing longitudinal plates and / or two transverse plates at its edge. The two transverse longitudinal plates and the two longitudinal longitudinal plates can form a U-shaped structure; The horizontal projection length of the substrate is not less than the longitudinal length of the corresponding single corrugated plate. Adjacent corrugated sheets are connected by butt joints or overlaps; When adjacent corrugated sheets are butted together, a pressure-relieving mechanism is provided between the adjacent corrugated sheets. The pressure-relief mechanism includes a pressure-relief component; the pressure-relief component includes an outer ring, and a support pad is provided inside the outer ring; The web of the rigid positioning beam has connection holes. During subsequent connections, the rigid positioning beam is first erected, and then bolts are used to connect each corrugated plate to the rigid positioning beam.

2. A tunnel support assembly according to claim 1, wherein, There should be at least one corrugated plate between adjacent rigid positioning beams.

3. A method of constructing a tunnel lining assembly as claimed in any one of claims 1-2, characterized in that, The construction method includes the following steps: S1: Excavate the tunnel according to the designed cross-sectional dimensions, and perform initial shotcreting on the surrounding rock after excavation; S2: Erect a rigid positioning beam and connect each corrugated plate to the rigid positioning beam in the longitudinal direction using longitudinal connecting bolts; S3: Fill the space between the corrugated plate structure and the initial shotcrete layer with concrete; S4: When the filling concrete in step S3 has reached a certain strength, install the pressure-relief prestressed anchor rods and pressure-relief prestressed anchor cables according to the deformation of the surrounding rock. S5: After the deformation of the tunnel support structure has basically stabilized, pour concrete for secondary lining. S6: After S5 is completed, the construction of a tunnel support assembly is finished. If the construction of the tunnel support assembly needs to be repeated, S1-S5 above can be repeated.

4. A method of constructing a tunnel support assembly according to claim 3, wherein, In S2, each corrugated plate body includes multiple individual corrugated plates. When adjacent individual corrugated plates are connected, they are connected by butt joint or overlap.

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