Tunnel secondary lining construction method, composite lining construction method and plugging device, embedded component and plugging component for secondary lining construction

Abstract

The invention provides a tunnel secondary lining construction method, a composite lining construction method, a plugging device for secondary lining construction, an embedded component and a plugging component, and the construction method comprises the steps that a plurality of steel corrugated plates prefabricated according to tunnel construction design requirements are fixed to preset positions in a tunnel, and the steel corrugated plates are closed into a ring in the annular direction; for the two steel corrugated plates at each connecting point, firstly fixing the steel corrugated plate on one side to enable the opening in the edge of the steel corrugated plate to half surround the temporary support, and then fixing the steel corrugated plate on the other side to enable the two openings to define a preformed hole and completely surround the temporary support; an embedded component is arranged and fixed in the preformed hole; concrete is poured into a gap between the steel corrugated plate and the primary support; and after the strength of the secondary lining structure meets the requirement, the temporary support is cut off and sealed through a blocking component, epoxy mortar is injected into the temporary support through a grouting hole in the blocking component, and construction is finished. According to the construction method provided by the invention, the temporary support does not need to be dismantled when the secondary lining is constructed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a tunnel secondary lining construction method, a composite lining construction method, and a plugging device, an embedded component and a plugging component used for secondary lining construction. Background Art

[0002] At present, the commonly used lining form in the construction of dark tunnels is composite lining, which is a support method to suppress tunnel deformation and settlement.

[0003] Composite lining refers to a tunnel lining that is constructed in two layers, inner and outer. Figure 1 As shown, after the tunnel is excavated, the outer layer of flexible support (generally sprayed anchor support) that is in close contact with the surrounding rock 10 is first applied in a timely manner, also known as the initial support 20 or the primary lining, to allow the surrounding rock to deform to a certain extent without causing excessive deformation due to loosening pressure. The general method of constructing the primary lining is to lay out a metal arch frame (not shown) that fits the surrounding rock and then spray concrete in time to form it. In order to ensure construction safety, a cross-shaped or criss-cross-shaped temporary support 30 that is connected and fixed to the arch frame will be vertically set in the tunnel to play a supporting and reinforcing role. Temporary support 30 is currently mostly made of I-beams. After the deformation of the surrounding rock is basically stable, the inner layer of lining (generally cast in a mold), also known as the secondary lining or secondary support, is applied. Between the two layers of lining, a waterproof layer is set as needed, or a waterproof concrete inner lining can be poured without a waterproof layer.

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0005] At present, in the process of composite lining construction, temporary supports are generally removed after the initial support construction is completed and before the secondary lining construction. However, the support effect is not ideal when the tunnel is in more complex conditions. In the process between removing temporary supports and constructing the secondary lining structure, the tunnel has certain deformation, which affects the construction quality and structural safety.

[0006] Therefore, a tunnel secondary lining construction method, a composite lining construction method, and a plugging device, an embedded component, and a plugging component for secondary lining construction are needed to at least partially solve the above technical problems. Summary of the invention

[0007] The embodiments of the present invention provide a tunnel secondary lining construction method, a composite lining construction method, and a plugging device, an embedded component, and a plugging component for secondary lining construction, which can avoid the need to remove temporary supports when constructing secondary lining.

[0008] In a first aspect, the present invention provides a tunnel secondary lining construction method, the secondary lining construction method comprising the following steps:

[0009] A plurality of steel corrugated plates prefabricated according to the tunnel construction design requirements and spliced ​​in the circumferential direction to form a closed ring are fixed at predetermined positions in the tunnel by hoisting, so that the steel corrugated plates are closed in the circumferential direction to form a ring and are at a certain distance from the initial support; wherein, the two steel corrugated plates corresponding to the connection point between the temporary support and the initial support are provided with openings at the edges of the corresponding splicing points that can be enclosed to form a reserved hole for the temporary support to pass through; during hoisting, for the two steel corrugated plates at each connection point, first fix the steel corrugated plate on one side so that the opening at its edge half surrounds the temporary support, and then fix the steel corrugated plate on the other side so that the two openings enclose the reserved hole and fully surround the temporary support;

[0010] An embedded component is arranged and fixed in the reserved hole, wherein the embedded component includes two closed bent plates connected end to end to form a cylindrical shell surrounding the temporary support, and the outer wall of the cylindrical shell formed by the two closed bent plates is sealed and connected to the plate wall corresponding to the edge of the reserved hole on the steel corrugated plate; the cylindrical shell formed by the two closed bent plates extends along the inlet and outlet direction of the reserved hole, and the top opening extending toward the initial support is sealed and connected to the surface of the initial support;

[0011] The secondary lining is formed along the longitudinal direction of the tunnel by pouring self-leveling micro-expansive concrete into the gap between the steel corrugated plate and the primary support;

[0012] After the strength of the secondary lining structure reaches the required level, the temporary support is cut off in the direction flush with the bottom opening of the cylindrical shell formed when the two closed bent plates are connected, and the bottom opening is closed with a plugging component. Epoxy mortar is injected inward through the grouting holes on the plugging component, and the construction is completed.

[0013] According to the secondary lining construction method of the present invention, firstly, an opening is opened in advance at the edge of the steel corrugated plate that can be closed into a ring along the annular direction by splicing, and the two openings of the two adjacent steel corrugated plates can be enclosed into a reserved hole for temporary support to pass through. When hoisting the two corresponding steel corrugated plates at each connection point, first fix the steel corrugated plate on one side so that the opening of its edge half surrounds the temporary support, and then fix the steel corrugated plate on the other side so that the two openings enclose the reserved hole and fully surround the temporary support. Subsequently, an embedded component is fixed in the reserved hole to achieve that the gap between the steel corrugated plate and the initial support is not connected to the reserved hole, and then concrete is poured, and then the temporary support is cut off for removal, and finally the reserved hole is closed and grouted by a blocking component. This construction method does not need to remove the temporary support in advance, improves construction efficiency, and ensures construction quality and structural safety.

[0014] In a second aspect, the present invention provides a tunnel composite lining construction method, the composite lining construction method comprising the following steps:

[0015] Before excavation, pipe curtains are installed as advance support measures;

[0016] After the tunnel excavation is completed, a metal arch frame that fits the surrounding rock and a temporary support connected and fixed to the metal arch frame are installed in the tunnel, and concrete is sprayed on the metal arch frame in time to form an initial support;

[0017] A plurality of steel corrugated plates prefabricated according to the tunnel construction design requirements and spliced ​​in the circumferential direction to form a closed ring are fixed at predetermined positions in the tunnel by hoisting, so that the steel corrugated plates are closed in the circumferential direction to form a ring and are at a certain distance from the initial support; wherein, the two steel corrugated plates corresponding to the connection point between the temporary support and the initial support are provided with openings at the edges of the corresponding splicing points that can be enclosed to form a reserved hole for the temporary support to pass through; during hoisting, for the two steel corrugated plates at each connection point, first fix the steel corrugated plate on one side so that the opening at its edge half surrounds the temporary support, and then fix the steel corrugated plate on the other side so that the two openings enclose the reserved hole and fully surround the temporary support;

[0018] An embedded component is arranged and fixed in the reserved hole, wherein the embedded component includes two closed bent plates connected end to end to form a cylindrical shell surrounding the temporary support, and the outer wall of the cylindrical shell formed by the two closed bent plates is sealed and connected to the plate wall corresponding to the edge of the reserved hole on the steel corrugated plate; the cylindrical shell formed by the two closed bent plates extends along the inlet and outlet direction of the reserved hole, and the top opening extending toward the initial support is sealed and connected to the surface of the initial support;

[0019] The secondary lining is formed along the longitudinal direction of the tunnel by pouring self-leveling micro-expansive concrete into the gap between the steel corrugated plate and the primary support;

[0020] After the strength of the secondary lining structure reaches the required level, the temporary support is cut off in the direction flush with the bottom opening of the cylindrical shell formed by the two closed bent plates, and the bottom opening is sealed with a plugging component. Epoxy mortar is injected inward through the grouting holes on the plugging component, and the construction is completed.

[0021] According to the composite lining construction method of the present invention, since it adopts the secondary lining construction method of the present invention, there is no need to remove temporary supports before secondary lining, thereby improving the overall efficiency of the composite lining construction method.

[0022] Optionally, the composite lining construction method also includes prefabricating steel corrugated plates: first, according to the tunnel construction design requirements, a plurality of steel corrugated plates that can be spliced ​​along the circumferential direction to form a closed ring are prefabricated, wherein the plurality of steel corrugated plates in the closed ring have at least a number and position of splicing points corresponding to the connection points between the temporary support and the initial support along the circumferential direction; then, the two steel corrugated plates at each connection point are respectively provided with openings at the edges of the corresponding splicing points for enclosing the reserved holes.

[0023] Optionally, the blocking member comprises:

[0024] A closing plate at the bottom, which covers the bottom opening of the embedded component to achieve closure and form a closed space;

[0025] Two vertically arranged mounting plates are arranged in the middle area of ​​the closing plate and extend into the cylindrical shell formed by the two closed curved plates, and a clamping channel formed between the two mounting plates is used to clamp the temporary support;

[0026] The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

[0027] Optionally, the top of the mounting plate is further provided with a lap plate rotatable in a vertical plane; the two lap plates are structured to extend in a reverse direction;

[0028] Two closed curved plates are respectively provided with two upwardly inclined support plates on the inner wall surfaces, which support the overlapping plates upwardly; and

[0029] Two connecting plates are arranged on the bottom surfaces of the two closed curved plates in a manner of approaching each other, the connecting plates comprising horizontal portions, the horizontal portions being horizontally attached to the closed plates downwards, and a gap being left between the two horizontal portions for the installation plates and the lap plates to pass through;

[0030] The bottom surface of the overlapping plate is connected to the mounting plate on the corresponding side via a spring to achieve tensioning.

[0031] Optionally, the temporary support structure is an I-beam, and a certain gap is left between the horizontal portion of the connecting plate and the closed bent plate on both sides perpendicular to its length direction to accommodate the wing plate of the I-beam used as a temporary support.

[0032] In a third aspect, the present invention provides a plugging device for secondary lining construction. The plugging device comprises a plugging component and an embedded component that cooperate with each other;

[0033] The embedded component comprises:

[0034] Two closed curved plates connected end to end can be formed to surround the temporarily supported cylindrical shell;

[0035] Two symmetrical support plates inclined upwardly and respectively arranged on the inner wall surfaces of the two closed curved plates;

[0036] The blocking member comprises:

[0037] The closing plate at the bottom is used to close the bottom opening of the cylindrical shell formed when the two closed bent plates are connected end to end and form a closed space;

[0038] Two vertically arranged side-by-side mounting plates are arranged in the middle area of ​​the closing plate, and a clamping channel for clamping temporary supports is formed between the two mounting plates;

[0039] A lap plate rotatable in a vertical plane arranged at the top of the mounting plate is used to overlap the support plate; the bottom surface of the lap plate is connected to the mounting plate on the corresponding side via a spring to achieve tension; wherein the two lap plates are configured to extend in a reverse direction;

[0040] The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

[0041] In a fourth aspect, the present invention provides an embedded component for secondary lining construction. The embedded component comprises:

[0042] Two closed curved plates connected end to end can be formed to surround the temporarily supported cylindrical shell;

[0043] Two upwardly inclined support plates respectively arranged on the inner wall surfaces of the two closed curved plates, used to support the overlapping plates of the blocking member upwardly; and

[0044] Two connecting plates are respectively arranged on the bottom surfaces of the two closed curved plates and are close to each other, and the connecting plates include a horizontal portion and a vertical portion extending downward and being separable from the horizontal portion; the horizontal portion can be horizontally attached to the closing plate of the blocking member downward, and a vertical passage for temporary support to pass through is formed between the two vertical portions, and can be fastened to the web of the I-beam used as a temporary support via a connecting piece;

[0045] Wherein, a certain gap is left between the horizontal portion of the connecting plate and the closed bent plate on both sides perpendicular to the length direction thereof, so as to accommodate the wing plate for temporary support.

[0046] In a fifth aspect, the present invention provides a plugging component for secondary lining construction. The plugging component comprises:

[0047] A closing plate located at the bottom, used to close the bottom opening of the embedded component and form a closed space;

[0048] Two vertically arranged side-by-side mounting plates are arranged in the middle area of ​​the closing plate, and a clamping channel for clamping temporary supports is formed between the two mounting plates;

[0049] A lap plate rotatable in a vertical plane disposed at the top end of the mounting plate is used to overlap the support plate of the embedded component; the bottom surface of the lap plate is connected to the mounting plate on the corresponding side via a spring to achieve tension; wherein the two lap plates are configured to extend in a reverse direction; and

[0050] The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

[0051] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0052] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0054] Figure 1 This is a schematic diagram of the connection between the existing primary support and temporary support in the tunnel;

[0055] Figure 2 A bottom view of a secondary lining construction method according to an embodiment of the present invention after an embedded component is arranged in a reserved hole surrounded by two steel corrugated plates;

[0056] Figure 3 for Figure 2 Schematic diagram of the internal structure of the structure shown (part);

[0057] Figure 4 For along Figure 2 A cross-sectional view of line AA in FIG. 1 , in which the temporary support (part) is hidden;

[0058] Figure 5 It is a schematic diagram (part) of the internal structure after the embedded components and the plugging components are arranged in the reserved hole surrounded by two steel corrugated plates in the secondary lining construction method according to one embodiment of the present invention;

[0059] Figure 6 A schematic diagram of a steel corrugated plate in a secondary lining construction method according to an embodiment of the present invention;

[0060] Figure 7 Schematic diagram of a composite lining formed by a composite lining construction method according to an embodiment of the present invention; Figure 7 (a) is a cross-sectional schematic diagram, Figure 7 (b) is Figure 7A schematic diagram of the enlarged part B in (a);

[0061] Figure 8 is a schematic diagram of a blocking member according to an embodiment of the present invention; wherein Figure 8 (a) is a side view, Figure 8 (b) is a top view; and

[0062] Fig. 9 is a top view of an embedded component according to an embodiment of the present invention; wherein at this time, two closed bent plates of the embedded component are in a first contact state; and

[0063] Fig.10 Schematic diagram of a closed bent plate embedded in a component according to an embodiment of the present invention.

[0064] Description of reference numerals:

[0065] 10. Surrounding rock; 20. Initial support; 30. Temporary support;

[0066] 110, corrugated steel plate; 111, opening; 112, joint;

[0067] 120, embedded member; 121, closed curved plate; 1211, first side plate; 1212, second side plate; 122, support plate; 123, connecting plate; 1231, horizontal portion; 1232, vertical portion; 124, aisle;

[0068] 130, blocking member; 131, closing plate; 132, mounting plate; 133, channel; 134, lap plate; 135, spring; 136, grouting hole;

[0069] 140. Tube curtain;

[0070] 150. Temporary support;

[0071] 160. Initial support;

[0072] 170. Concrete. DETAILED DESCRIPTION

[0073] By referring to the exemplary embodiments, the objects and functions of the present invention and the methods for achieving these objects and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0075] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0076] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0077] refer to Figure 1 The temporary support in the embodiment of the present application can adopt the existing technical device, generally an I-beam. The I-beam includes a web and two vertical wing plates.

[0078] First, the embodiment of the present invention provides a tunnel secondary lining construction method. The construction method mainly includes the following steps: 1. hoisting spliced ​​steel corrugated plates; 2. arranging embedded components; 3. pouring concrete; 4. sealing the plugging components and grouting.

[0079] Among them, the construction method of the embodiment of the present invention can prefabricate the steel corrugated plate 110 in advance according to the tunnel construction design requirements before hoisting the spliced ​​steel corrugated plate 110.

[0080] First, according to the tunnel construction design requirements, multiple pieces of steel corrugated plates 110 that can be spliced ​​in the circumferential direction to form a closed ring are prefabricated. For example, the three-dimensional dimensions (length, width and thickness) of the steel corrugated plates 110, the materials used and the number of splicing in the circumferential direction are determined. The prefabricated steel corrugated plates 110 present a certain curvature to adapt to the tunnel contour as much as possible. Among them, the multiple steel corrugated plates 110 in the closed ring have at least a number and position of splicing points 112 corresponding to the connection points between the temporary support 150 and the initial support 160 in the circumferential direction. That is, for example, when the temporary support 150 is a cross-shaped temporary support 150, the number of steel corrugated plates 110 in a complete circumferential direction is at least 4, for example, it can be a reasonable number of 4, 5, 6, etc. When the temporary support 150 is a tic-tac-toe or other type of temporary support 150, the number of steel corrugated plates 110 in a complete circumferential direction is determined according to actual needs. Then, the two steel corrugated plates 110 at each connection point are respectively provided with openings 111 for enclosing a reserved hole at the edges of the corresponding joints 112. The size of the reserved hole is generally required to be larger than the cross-sectional size of the temporary support 150 to facilitate the passage of the temporary support 150. The shape of the reserved hole is not limited, for example, it can be a square hole, a circular hole, etc.

[0081] Specifically, a plurality of prefabricated steel corrugated plates 110 according to the tunnel construction design requirements are fixed at predetermined positions in the tunnel by hoisting, so that the steel corrugated plates 110 are closed in a ring along the annular direction. A certain distance is left between the closed steel corrugated plates 110 and the initial support 160 to facilitate the subsequent pouring of concrete 170. During hoisting, for the two steel corrugated plates 110 at each connection point, the steel corrugated plates 110 on one side are first fixed so that the openings 111 on the edges half surround the temporary support 150, and then the steel corrugated plates 110 on the other side are fixed so that the two openings 111 enclose a reserved hole and fully surround the temporary support 150. The direction of the corrugated lines of the steel corrugated plates 110 after hoisting can be perpendicular to the longitudinal direction of the tunnel. Among them, the implementation method of fixing the steel corrugated plates 110 at predetermined positions in the tunnel can adopt the existing technology, which will not be described in detail here. The connection between the steel corrugated plates 110 along the circumferential direction and the connection between the steel corrugated plates 110 along the longitudinal direction of the tunnel can be realized by using the existing technology. Figure 6 The steel corrugated plates 110 may be connected by connecting flange bolts along the annular direction and may be welded for reinforcement. The steel corrugated plates 110 may be connected by bolts along the longitudinal direction.

[0082] After the steel corrugated plates 110 are closed into a ring along the annular direction and fixed at a predetermined position in the tunnel, the two steel corrugated plates 110 have a reserved hole surrounded by openings 111 on both sides at the joint 112 corresponding to the connection point between the temporary support 150 and the initial support 160. The temporary support 150 passes through the reserved hole.

[0083] Then, the embedded component 120 is arranged and fixed in the reserved hole. The embedded component 120 includes two closed bent plates 121 connected end to end to form a cylindrical shell surrounding the temporary support 150. The outer wall of the cylindrical shell formed by the two closed bent plates 121 is sealed to the plate wall on the steel corrugated plate 110 corresponding to the edge of the reserved hole. The cylindrical shell formed by the two closed bent plates 121 extends along the entry and exit direction of the reserved hole, and the top opening 111 extending toward the initial support 160 is sealed to the surface of the initial support 160. Among them, the shape and size of the cylindrical shell formed by the two closed bent plates 121 are adapted to the reserved hole, and the shape of the closed bent plates 121 may not be limited. Reference Figure 2 , Fig. 9 and Fig.10 When the reserved hole is a square hole, the two closed curved plates 121 can be symmetrical door-shaped curved plates. Each closed curved plate 121 includes a first side plate 1211 and two second side plates 1212. Figure 4 When the embedded component 120 is arranged in the reserved hole, the first side plate 1211 of the closed bent plate 121 extends into the two openings 111 of the two steel corrugated plates 110, and the second side plate 1212 can be bolted to the connecting flange of the steel corrugated plates 110 to strengthen the connection.

[0084] In order to further enhance the stability of the embedded component 120 arranged in the reserved hole, the two closed curved plates 121 can also be provided with two connecting plates 123 on the bottom surface of the first side plate 1211 in a manner close to each other. The connecting plate 123 can include a horizontal portion 1231 and a vertical portion 1232 extending downward and disconnectable from the horizontal portion 1231. Figure 3 A vertical passage 124 for the temporary support 150 to pass through is formed between the two vertical parts 1232, that is, the two vertical parts 1232 are close to the web of the temporary support 150 from both sides. In this way, the two vertical parts 1232 can be fastened to the web of the I-beam by connecting members (such as bolts).

[0085] Considering that the temporary support 150 is mostly an I-beam structure, a certain gap is left between the horizontal portion 1231 of the connecting plate 123 and the second side plates 1212 on both sides to accommodate the wing plates of the I-beam.

[0086] Then, a secondary lining is formed along the longitudinal direction of the tunnel by pouring self-leveling micro-expansive concrete 170 into the gap between the steel corrugated plate 110 and the initial support 160. Before pouring the concrete 170, concrete 170 templates (existing technology devices) can also be arranged at intervals in the gap between the steel corrugated plate 110 and the initial support 160 to reduce the amount of poured concrete 170 and improve construction efficiency.

[0087] After the strength of the secondary lining structure reaches the required level, the temporary support 150 is cut off in the direction in which the bottom opening 111 of the cylindrical shell formed by the two closed bent plates 121 is flush. If the closed bent plate 121 of the embedded component 120 in the reserved hole is connected with a connecting plate 123, the vertical portion 1232 is also cut off when the temporary support 150 is cut. At this time, a section of the end of the temporary support 150 remains in the reserved hole (cylindrical shell). The bottom opening 111 of the cylindrical shell formed by the two closed bent plates 121 is closed by a sealing component 130, and finally epoxy mortar is injected inward through the grouting holes 136 on the sealing component 130 to fill the enclosed space and improve the structural strength. The sealing component 130 can adopt an existing technical device.

[0088] In a preferred embodiment, in order to provide a blocking member 130 with a simple structure, convenient use and good blocking effect, reference is made to Figure 8 The blocking member 130 may be in the following form, including a closing plate 131 and a mounting plate 132 .

[0089] Specifically, the closing plate 131 at the bottom covers the bottom opening 111 of the embedded component 120 to achieve closure and form a closed space. A grouting hole 136 is provided in the middle area of ​​the closing plate 131 to inject grout into the closed space.

[0090] Two mounting plates 132 arranged vertically side by side are arranged in the middle area of ​​the closing plate 131. The two mounting plates 132 extend into the cylindrical shell formed by connecting the two closed curved plates 121. The clamping channel 133 formed between the two mounting plates 132 clamps the temporary support 150.

[0091] In order to allow the installation plate 132 and the lap plate 134 to extend into the enclosed space (the cylindrical shell formed by the two closed curved plates 121), if the closed curved plate 121 of the embedded component 120 in the reserved hole is connected with a connecting plate 123 (including a horizontal portion 1231 and a vertical portion 1232), after the temporary support 150 and the vertical portion 1232 are cut off, part of the horizontal portion 1231 can be cut off to leave enough gap for the installation plate 132 and the lap plate 134 to pass through. When the blocking component 130 is installed in place, the horizontal portion 1231 is horizontally attached to the closing plate 131 downward, and the two can be connected by fastening methods such as welding to achieve the installation of the blocking component 130.

[0092] refer to Figure 5When the mounting plate 132 and the overlapping plate 134 of the blocking member 130 pass through the gap between the two horizontal portions 1231, the end of a temporary support 150 remaining in the previously reserved hole (cylindrical shell) is aligned with the channel 133 formed between the two mounting plates 132. Through the matching relationship between the end of the temporary support 150 and the channel 133, the directional movement of the blocking member 130 is achieved, and the installation stability of the blocking member 130 is also enhanced.

[0093] In order to further improve the installation stability of the blocking member 130, refer to Figure 8 The top of the mounting plate 132 of the blocking member 130 may also be provided with a lap plate 134 that can rotate in a vertical plane. For example, the lap plate 134 and the mounting plate 132 may be rotatably connected by hinges. The two lap plates 134 extend in a reverse direction. A connecting spring 135 is also provided between the bottom surface of the lap plate 134 and the mounting plate 132 on the corresponding side.

[0094] Accordingly, refer to Fig. 9 and Fig.10 , two support plates 122 inclined upward are respectively arranged on the inner wall surface of the two closed curved plates 121 of the embedded member 120, such as the inner side surface of the two first side plates 1211. When the mounting plate 132 and the lap plate 134 of the blocking member 130 pass through the gap between the two horizontal parts 1231 and extend into the cylindrical shell formed by the two closed curved plates 121, the position is appropriately adjusted so that the lap plate 134 overlaps the support plate 122, and because the lap plate 134 is tightened by the spring 135, the overlap between the two is more stable.

[0095] In summary, according to the construction method of this embodiment, the edges of the two steel corrugated plates 110 at the connection points of the temporary support 150 are opened in advance to form a reserved hole for the temporary support 150 to pass through. When hoisting the two steel corrugated plates 110 corresponding to each connection point, the steel corrugated plate 110 on one side is first fixed so that the opening 111 on its edge half surrounds the temporary support 150, and then the steel corrugated plate 110 on the other side is fixed so that the two openings 111 surround the reserved hole and fully surround the temporary support 150, and then the embedded components 120 and the blocking components 130 that cooperate with each other are installed in the reserved hole to realize the pouring of concrete 170 behind the steel corrugated pipe and the grouting in the reserved hole. This construction method realizes the pouring of concrete 170 without removing the temporary support 150, improves the construction efficiency, minimizes the deformation of the tunnel, ensures the safety during the tunnel construction and operation, and minimizes the impact on existing roads or buildings, thereby avoiding the risk problems in construction and operation.

[0096] At present, the commonly used lining form in the construction of dark-cut tunnels is composite lining, which refers to the tunnel lining that is constructed in two layers, inner and outer. During the composite lining construction process, after the initial support 160 is completed and before the secondary lining construction, the temporary support 150 is generally removed, resulting in certain deformation of the tunnel, affecting the construction quality and structural safety.

[0097] Therefore, in order to solve the above problems, an embodiment of the present invention further provides a tunnel composite lining construction method. The construction method comprises the following steps:

[0098] Before excavation, pipe curtain 140 is installed as an advance support measure.

[0099] After the tunnel excavation is completed, a metal arch frame that fits the surrounding rock and a temporary support 150 that is connected and fixed to the metal arch frame are installed in the tunnel, and concrete 170 is sprayed on the metal arch frame in time to form an initial support 160.

[0100] A plurality of steel corrugated plates 110 prefabricated according to the tunnel construction design requirements and spliced ​​in the circumferential direction to form a closed ring are fixed at a predetermined position in the tunnel by hoisting, so that the steel corrugated plates 110 are closed in the circumferential direction to form a ring and are at a certain distance from the initial support 160. During hoisting, for the two steel corrugated plates 110 at each connection point, the steel corrugated plates 110 on one side are first fixed so that the openings 111 at the edges half surround the temporary support 150, and then the steel corrugated plates 110 on the other side are fixed so that the two openings 111 enclose a reserved hole and fully surround the temporary support 150.

[0101] An embedded component 120 is arranged and fixed in the reserved hole. The embedded component 120 includes two closed bent plates 121 connected end to end to form a cylindrical shell surrounding the temporary support 150. The outer wall of the cylindrical shell formed by the connection of the two closed bent plates 121 is sealed and connected to the plate wall corresponding to the edge of the reserved hole on the steel corrugated plate 110. The cylindrical shell formed by the connection of the two closed bent plates 121 extends along the inlet and outlet direction of the reserved hole, and the top opening 111 extending toward the initial support 160 is sealed and connected to the surface of the initial support 160.

[0102] A secondary lining is formed by pouring self-leveling micro-expansive concrete 170 into the gap between the steel corrugated plate 110 and the primary support 160 along the longitudinal direction of the tunnel.

[0103] After the strength of the secondary lining structure reaches the required level, the temporary support 150 is cut off in a direction flush with the bottom opening 111 of the cylindrical shell formed by the two closed bent plates 121, and the bottom opening 111 is sealed with a plugging component 130. Epoxy mortar is injected inward through the grouting holes 136 on the plugging component 130, and the construction is completed.

[0104] Among them, the composite lining structure formed by the composite lining construction method according to the embodiment of the present invention is shown in FIG. Figure 7 Regarding the composite lining construction method according to the embodiment of the present invention, the specific contents of the relevant steps can refer to the contents of the steps of the secondary lining construction method according to the embodiment of the present invention, and will not be described repeatedly.

[0105] In addition, the specific contents of the prefabricated steel corrugated plate 110, the blocking member 130 and the embedded member 120 are the same as above and will not be repeated here.

[0106] On the other hand, an embodiment of the present invention also provides a plugging device for secondary lining construction. Figure 5 The blocking device includes a blocking component 130 and an embedding component 120 that cooperate with each other.

[0107] refer to Fig. 9 and Fig.10 The embedded component 120 may include two closed bent plates 121 connected end to end to form a cylindrical shell for surrounding the temporary support 150 and two symmetrical support plates 122 respectively arranged on the inner wall surfaces of the two closed bent plates 121 and inclined upward.

[0108] refer to Figure 8 The plugging member 130 may include a closing plate 131 at the bottom. The closing plate 131 is used to close the bottom opening 111 of the cylindrical shell formed when the two closed curved plates 121 are connected end to end and form a closed space. A grouting hole 136 is provided through the middle area of ​​the closing plate 131 upwardly for grouting into the closed space.

[0109] Two vertically arranged mounting plates 132 are arranged in the middle area of ​​the closing plate 131. A clamping channel 133 for clamping the temporary support 150 is formed between the two mounting plates 132.

[0110] The lap plate 134 rotatable in the vertical plane arranged at the top of the mounting plate 132 is used to overlap the support plate 122. The bottom surface of the lap plate 134 is connected to the mounting plate 132 on the corresponding side via a spring 135 to achieve tension. The two lap plates 134 are configured to extend in the reverse direction.

[0111] Among them, regarding the blocking device for secondary lining construction provided according to an embodiment of the present invention, its specific content can be referred to the previous text and will not be repeated here.

[0112] In a fourth aspect, an embodiment of the present invention further provides an embedded component 120 for secondary lining construction. Fig. 9 and Fig.10 , the embedded member 120 may include:

[0113] The two closed curved plates 121 connected end to end can form a cylindrical shell for surrounding the temporary support 150.

[0114] Two upwardly inclined support plates 122 respectively arranged on the inner wall surfaces of the two closed curved plates 121 are used to support the overlapping plates 134 of the blocking member 130 upwardly.

[0115] Two connecting plates 123 are respectively arranged on the bottom surfaces of the two closed curved plates 121 and are close to each other. The connecting plate 123 includes a horizontal portion 1231 and a vertical portion 1232 extending downward and disconnectable from the horizontal portion 1231. The horizontal portion 1231 can be horizontally attached to the closing plate 131 of the blocking member 130 downward. A vertical passage 124 for the temporary support 150 to pass through is formed between the two vertical portions 1232, and can be fastened to the web of the I-beam used as the temporary support 150 via a connecting piece.

[0116] There is a certain gap between the horizontal portion 1231 of the connecting plate 123 and the closed bent plate 121 on both sides perpendicular to the length direction thereof, so as to accommodate the wing plate of the temporary support 150 .

[0117] Among them, regarding the embedded component 120 for secondary lining construction provided according to an embodiment of the present invention, its specific content is referred to the above text and will not be repeated here.

[0118] In a fifth aspect, an embodiment of the present invention further provides a plugging component 130 for secondary lining construction. Figure 8 The blocking member 130 may include a closing plate 131 , a mounting plate 132 and a lap plate 134 .

[0119] Specifically, the closing plate 131 at the bottom is used to close the bottom opening 111 of the embedded component 120 and form a closed space;

[0120] Two vertically arranged mounting plates 132 are arranged in the middle area of ​​the closing plate 131. A clamping channel 133 for clamping the temporary support 150 is formed between the two mounting plates 132.

[0121] The lap plate 134 rotatable in the vertical plane and arranged at the top of the mounting plate 132 is used to overlap the support plate 122 of the embedded component 120. The bottom surface of the lap plate 134 is connected to the mounting plate 132 on the corresponding side via a spring 135 to achieve tension. The two lap plates 134 are configured to extend in the reverse direction.

[0122] The grouting hole 136 which penetrates upward and is arranged in the middle area of ​​the closing plate 131 is used for injecting grout into the closed space.

[0123] Among them, regarding the blocking component 130 for secondary lining construction provided according to an embodiment of the present invention, its specific content is referred to the above text and will not be repeated here.

[0124] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of means or steps not listed in the claims. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0125] Other embodiments of the present invention will be readily apparent to those skilled in the art from the description and practice of the invention disclosed herein. The description and embodiments are to be considered exemplary only, and the true scope and spirit of the present invention are to be limited by the claims.

Claims

1. A method for secondary lining construction of a tunnel, carried out without removing temporary supports connected to the initial supports, characterized in that: The construction method comprises: A plurality of steel corrugated plates prefabricated according to the tunnel construction design requirements and spliced ​​in the circumferential direction to form a closed ring are fixed at predetermined positions in the tunnel by hoisting, so that the steel corrugated plates are closed in the circumferential direction to form a ring and are at a certain distance from the initial support; wherein, the two steel corrugated plates corresponding to the connection point between the temporary support and the initial support are provided with openings at the edges of the corresponding splicing points that can be enclosed to form a reserved hole for the temporary support to pass through; during hoisting, for the two steel corrugated plates at each connection point, first fix the steel corrugated plate on one side so that the opening at its edge half surrounds the temporary support, and then fix the steel corrugated plate on the other side so that the two openings enclose the reserved hole and fully surround the temporary support; An embedded component is arranged and fixed in the reserved hole, wherein the embedded component includes two closed bent plates connected end to end to form a cylindrical shell surrounding the temporary support, and the outer wall of the cylindrical shell formed by the two closed bent plates is sealed and connected to the plate wall corresponding to the edge of the reserved hole on the steel corrugated plate; the cylindrical shell formed by the two closed bent plates extends along the inlet and outlet direction of the reserved hole, and the top opening extending toward the initial support is sealed and connected to the surface of the initial support; The secondary lining is formed along the longitudinal direction of the tunnel by pouring self-leveling micro-expansive concrete into the gap between the steel corrugated plate and the primary support; After the strength of the secondary lining structure reaches the required level, the temporary support is cut off in the direction flush with the bottom opening of the cylindrical shell formed when the two closed bent plates are connected, and the bottom opening is closed with a plugging component. Epoxy mortar is injected inward through the grouting holes on the plugging component, and the construction is completed.

2. The construction method according to claim 1, characterized in that: It also includes prefabricated steel corrugated plates: first, according to the tunnel construction design requirements, a plurality of steel corrugated plates that can be spliced ​​along the circumferential direction to form a closed ring are prefabricated, wherein the plurality of steel corrugated plates in the closed ring state have at least a number and position of splicing points corresponding to the connection points between the temporary support and the initial support along the circumferential direction; then, the two steel corrugated plates at each connection point are respectively provided with openings at the edges of the corresponding splicing points for enclosing the reserved holes.

3. The construction method according to claim 1, characterized in that: The blocking member comprises: A closing plate at the bottom, which covers the bottom opening of the embedded component to achieve closure and form a closed space; Two vertically arranged mounting plates are arranged in the middle area of ​​the closing plate and extend into the cylindrical shell formed by the two closed curved plates, and a clamping channel formed between the two mounting plates is used to clamp the temporary support; The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

4. The construction method according to claim 3, characterized in that: The top of the mounting plate is also provided with a lap plate rotatable in a vertical plane; the two lap plates are structured to extend in a reverse direction; Two closed curved plates are respectively provided with two upwardly inclined support plates on the inner wall surfaces, which support the overlapped plates upwardly; as well as Two connecting plates are arranged on the bottom surfaces of the two closed curved plates in a manner of approaching each other, the connecting plates comprising horizontal portions, the horizontal portions being horizontally attached to the closed plates downwards, and a gap being left between the two horizontal portions for the installation plates and the lap plates to pass through; The bottom surface of the overlapping plate is connected to the mounting plate on the corresponding side via a spring to achieve tensioning.

5. The construction method according to claim 4, characterized in that: The temporary support structure is an I-beam, and a certain gap is left between the horizontal part of the connecting plate and the closed bent plate on both sides perpendicular to its length direction to accommodate the wing plate of the I-beam used as a temporary support.

6. A tunnel composite lining construction method, characterized in that: The construction method comprises: Before excavation, pipe curtains are installed as advance support measures; After the tunnel excavation is completed, a metal arch frame that fits the surrounding rock and a temporary support connected and fixed to the metal arch frame are installed in the tunnel, and concrete is sprayed on the metal arch frame in time to form an initial support; A plurality of steel corrugated plates prefabricated according to the tunnel construction design requirements and spliced ​​in the circumferential direction to form a closed ring are fixed at predetermined positions in the tunnel by hoisting, so that the steel corrugated plates are closed in the circumferential direction to form a ring and are at a certain distance from the initial support; wherein, the two steel corrugated plates corresponding to the connection point between the temporary support and the initial support are provided with openings at the edges of the corresponding splicing points that can be enclosed to form a reserved hole for the temporary support to pass through; during hoisting, for the two steel corrugated plates at each connection point, first fix the steel corrugated plate on one side so that the opening at its edge half surrounds the temporary support, and then fix the steel corrugated plate on the other side so that the two openings enclose the reserved hole and fully surround the temporary support; An embedded component is arranged and fixed in the reserved hole, wherein the embedded component includes two closed bent plates connected end to end to form a cylindrical shell surrounding the temporary support, and the outer wall of the cylindrical shell formed by the connection of the two closed bent plates is sealed and connected to the plate wall corresponding to the edge of the reserved hole on the steel corrugated plate; the cylindrical shell formed by the connection of the two closed bent plates extends along the inlet and outlet direction of the reserved hole, and the top opening extending toward the initial support is sealed and connected to the surface of the initial support; The secondary lining is formed along the longitudinal direction of the tunnel by pouring self-leveling micro-expansive concrete into the gap between the steel corrugated plate and the primary support; After the strength of the secondary lining structure reaches the required level, the temporary support is cut off in the direction flush with the bottom opening of the cylindrical shell formed by the two closed bent plates, and the bottom opening is sealed with a plugging component. Epoxy mortar is injected inward through the grouting holes on the plugging component, and the construction is completed.

7. A plugging device for secondary lining construction, used to plug the reserved hole formed by two steel corrugated plates at the joint for temporary support during secondary lining construction, characterized in that: The blocking device comprises a blocking component and an embedding component that cooperate with each other; The embedded component comprises: Two closed curved plates connected end to end can be formed to surround the temporarily supported cylindrical shell; Two symmetrical support plates inclined upwardly and respectively arranged on the inner wall surfaces of the two closed curved plates; The blocking member comprises: The closing plate at the bottom is used to close the bottom opening of the cylindrical shell formed when the two closed bent plates are connected end to end and form a closed space; Two vertically arranged side-by-side mounting plates are arranged in the middle area of ​​the closing plate, and a clamping channel for clamping temporary supports is formed between the two mounting plates; A lap plate rotatable in a vertical plane arranged at the top of the mounting plate is used to overlap the support plate; the bottom surface of the lap plate is connected to the mounting plate on the corresponding side via a spring to achieve tension; wherein the two lap plates are configured to extend in a reverse direction; The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

8. The blocking device according to claim 7, characterized in that: The bottom surfaces of the two closed curved plates are also provided with two connecting plates facing each other; the connecting plates include a horizontal portion, the horizontal portion can be horizontally attached to the closed plate downward, and a gap is left between the two horizontal portions for the installation plate and the overlap plate to pass through; Wherein, when the temporary support is an I-beam, a certain gap is left between the horizontal portion of the connecting plate and the closed bent plate on both sides perpendicular to its length direction to accommodate the wing plate of the temporary support.

9. A plugging component for secondary lining construction, the plugging component is used in conjunction with an embedded component for secondary lining construction, characterized in that: The blocking member comprises: A closing plate located at the bottom, used to close the bottom opening of the embedded component and form a closed space; Two vertically arranged side-by-side mounting plates are arranged in the middle area of ​​the closing plate, and a clamping channel for clamping temporary supports is formed between the two mounting plates; A lap plate rotatable in a vertical plane disposed at the top end of the mounting plate is used to overlap the support plate of the embedded component; the bottom surface of the lap plate is connected to the mounting plate on the corresponding side via a spring to achieve tension; wherein the two lap plates are configured to extend in a reverse direction; and The grouting holes penetrating upwards are arranged in the middle area of ​​the closing plate and are used for grouting into the enclosed space.

10. An embedded component for secondary lining construction, the embedded component is used in conjunction with a plugging component for secondary lining construction, characterized in that: The embedded component comprises: Two closed curved plates connected end to end can be formed to surround the temporarily supported cylindrical shell; Two upwardly inclined support plates respectively arranged on the inner wall surfaces of the two closed curved plates, used to support the overlapping plates of the blocking member upwardly; and Two connecting plates are respectively arranged on the bottom surfaces of the two closed curved plates and are close to each other, and the connecting plates include a horizontal portion and a vertical portion extending downward and being separable from the horizontal portion; the horizontal portion can be horizontally attached to the closing plate of the blocking member downward, and a vertical passage for temporary support to pass through is formed between the two vertical portions, and can be fastened to the web of the I-beam used as a temporary support via a connecting piece; Wherein, a certain gap is left between the horizontal portion of the connecting plate and the closed bent plate on both sides perpendicular to the length direction thereof, so as to accommodate the wing plate for temporary support.

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