Double-layer steel arch support structure with corrugated pipe and large deformation section
Patent Information
- Application Number
- CN202522617317.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-10
AI Technical Summary
Existing tunnel support technologies are prone to localized arch settlement, initial support cracking, and I-beam deformation in high-altitude, cold, fault-bounded, and water-rich soft rock environments with large deformation. They cannot effectively adapt to surrounding rock deformation, and the construction costs are high, with the steel sections prone to brittle failure.
A flexible support structure with a double-layer steel arch frame and corrugated steel pipes in the large deformation section is adopted, including an outer and inner steel frame, with corrugated steel pipes installed in the gaps and fixed by concrete filling, which can adapt to the deformation of the surrounding rock and maintain the rigidity and load-bearing capacity of the steel.
It alleviates localized tunnel arch settlement and initial support cracking, adapts to surrounding rock deformation, reduces construction costs, avoids brittle failure of steel sections, and ensures the safety of the initial support system.
Smart Images
Figure CN224931689U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of tunnel construction engineering, and in particular to a flexible support structure with a double-layer steel arch frame and corrugated steel pipe for large deformation sections. Background Technology
[0002] With the vigorous development of my country's economic construction, the demand for transportation infrastructure construction is constantly increasing. Especially in the northwest region, which is characterized by high altitude, rugged terrain, and complex geology, a large number of mountain tunnel projects have emerged. Due to the improvement of highway construction standards, these tunnel projects often inevitably have to traverse complex and dangerous geological environments. Among them, a considerable number of tunnels are located in adverse geological conditions such as high altitude and cold, fault compression and fracture zones, and water-rich soft rock with large deformation. If the initial support is not timely or the method is inappropriate, large deformations are likely to occur, making it difficult to meet the construction and operation safety requirements of mountain tunnels.
[0003] Existing tunnel support technologies have certain drawbacks. First, traditional construction techniques are highly susceptible to large deformation risks in soft rock within fault fracture zones during the initial support process, with some tunnels exhibiting characteristics of localized arch settlement, initial support cracking, and severe tortuosity of the I-beams. Second, traditional construction techniques and support measures often require significant investment of manpower, materials, and financial resources. Finally, under substantial deformation pressure, traditional construction methods cannot effectively absorb the strain energy of the surrounding rock, leading to brittle failures such as warping, twisting, and fracture of the steel sections. These methods fail to maintain the rigidity and load-bearing capacity of the steel sections, and cannot preserve the initial alignment and axial stress, making them prone to secondary lining intrusion and requiring replacement of the arch support. Utility Model Content
[0004] The purpose of this utility model is to provide a flexible support structure with double-layer steel arch frame and steel corrugated pipe for large deformation sections, so as to alleviate the technical problems of partial tunnel arch settlement, initial support cracking and I-beam deformation in the existing technology, which in turn make it unable to adapt to the deformation of the surrounding rock.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: In the first aspect, this utility model provides a flexible support structure for a double-layer steel arch frame with corrugated steel pipe in a large deformation section, including an outer steel frame, a corrugated steel pipe and an inner steel frame. Both the outer steel frame and the inner steel frame are designed as semi-arc structures, and the outer steel frame is sleeved on the outside of the inner steel frame. The steel corrugated pipes are provided in multiples, and the multiple steel corrugated pipes are sequentially arranged in the gap between the outer steel frame and the inner steel frame.
[0006] Furthermore, multiple outer steel frames and multiple inner steel frames are provided, and the multiple outer steel frames and multiple inner steel frames are distributed at intervals along the extension direction of the tunnel.
[0007] Furthermore, adjacent corrugated steel pipes abut against each other, and each corrugated steel pipe is distributed along the extension direction of the tunnel.
[0008] Furthermore, the flexible support structure of the double-layer steel arch frame with corrugated steel pipe in the large deformation section also includes concrete filler, which is filled between the outer wall of the corrugated steel pipe and the outer steel frame and the inner steel frame.
[0009] Furthermore, the flexible support structure of the double-layer steel arch frame with corrugated steel pipe in the large deformation section also includes a tunnel bottom steel frame, which is located at the bottom of the outer steel frame and is connected to the corresponding outer steel frame.
[0010] Furthermore, the double-layer steel arch frame with corrugated steel pipe flexible support structure in the large deformation section also includes an invert backfill material. The invert backfill material is provided on the top of the tunnel bottom steel frame, and the top of the invert backfill material is flush with and connected to the bottom of the inner steel frame.
[0011] Furthermore, the distance between the outer steel frame and the inner steel frame is 50cm.
[0012] Furthermore, all of the aforementioned corrugated steel pipes are high-strength corrugated steel pipes with a diameter of φ30.
[0013] Furthermore, both the outer steel frame and the inner steel frame are I-beam steel frames.
[0014] Furthermore, the thickness of the sprayed concrete filler is 78 cm.
[0015] This utility model can achieve the following beneficial effects: In the first aspect, this utility model provides a flexible support structure for a double-layer steel arch frame with corrugated steel pipes in a large deformation section, including an outer steel frame, corrugated steel pipes and an inner steel frame. Both the outer and inner steel frames are designed as elliptical arc structures, and the outer steel frame is sleeved on the outside of the inner steel frame. Multiple corrugated steel pipes are provided, and the multiple corrugated steel pipes are arranged sequentially in the gap between the outer and inner steel frames.
[0016] In this utility model, both the outer and inner steel frames are semi-circular steel frames, with the outer steel frame located outside the inner steel frame. The distance between the outer and inner steel frames is 50cm, and the overall allowance for deformation is 60cm. It should be noted that the outer steel frame can be an HW200 type steel arch frame, and the inner steel frame can be constructed promptly after the initial support construction of the outer layer is completed and the deformation reaches 10cm. The inner steel frame can be an I20 I-beam arch frame. Subsequently, multiple sets of corrugated steel pipes can be installed between the outer and inner steel frames, and the corrugated steel pipes can be φ30 high-strength corrugated steel pipes.
[0017] Compared with the prior art, this utility model provides a flexible support structure with double-layer steel arch frame and corrugated steel pipe in large deformation section. By supporting the outer steel frame and the inner steel frame, and setting multiple corrugated steel pipes between the outer steel frame and the inner steel frame, it can adapt to the deformation of the surrounding rock in the case of local arch settlement, initial support cracking and I-beam deformation of the tunnel.
[0018] In summary, this utility model at least alleviates the technical problems existing in the prior art, such as partial tunnel arch settlement, initial support cracking, and I-beam deformation, which lead to the inability to adapt to surrounding rock deformation. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 A schematic diagram of the overall structure of the flexible support structure with double-layer steel arch frame and corrugated steel pipe for large deformation section provided in this embodiment of the utility model; Figure 2 A partial top view of the flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section provided in this embodiment of the utility model.
[0021] Icons: 1-Outer steel frame; 2-Corrugated steel pipe; 3-Inner steel frame; 4-Concrete filler; 5-Backfill material for invert arch; 6-Tunnel bottom steel frame. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0029] Example 1 This embodiment provides a flexible support structure for a large deformation section with a double-layer steel arch frame and corrugated steel pipe, referring to... Figure 1 and Figure 2 The large deformation section double-layer steel arch frame with corrugated steel pipe flexible support structure includes an outer steel frame 1, a corrugated steel pipe 2 and an inner steel frame 3. Both the outer steel frame 1 and the inner steel frame 3 are designed as semi-arc structures, and the outer steel frame 1 is fitted on the outside of the inner steel frame 3. There are multiple corrugated steel pipes 2, and multiple corrugated steel pipes 2 are arranged in sequence in the gap between the outer steel frame 1 and the inner steel frame 3.
[0030] This utility model embodiment at least alleviates the technical problems existing in the prior art, such as partial tunnel arch settlement, initial support cracking, and I-beam deformation, which lead to the inability to adapt to surrounding rock deformation.
[0031] In this embodiment of the utility model, both the outer steel frame 1 and the inner steel frame 3 are semi-arc steel frames, and the outer steel frame 1 is located outside the inner steel frame 3. The distance between the outer steel frame 1 and the inner steel frame 3 is 50cm, and the overall allowance for deformation is 60cm. It should be noted that the outer steel frame 1 can be an HW200 type steel arch frame, and after the initial support construction of the outer layer is completed and the deformation is 10cm, the inner steel frame 3 can be constructed in time. The inner steel frame 3 can be an I20 I-beam steel arch frame. Then, multiple sets of corrugated steel pipes 2 can be provided between the outer steel frame 1 and the inner steel frame 3, and the corrugated steel pipes 2 can be φ30 high-strength corrugated steel pipes.
[0032] Compared with the prior art, the present invention provides a flexible support structure with double-layer steel arch frame and corrugated steel pipe in large deformation section. By supporting the outer steel frame 1 and the inner steel frame 3, and providing multiple corrugated steel pipes 2 between the outer steel frame 1 and the inner steel frame 3, it can adapt to the technical effect of surrounding rock deformation under the conditions of local arch settlement, initial support cracking and I-beam deformation in the tunnel.
[0033] In an optional implementation of this embodiment, refer to Figure 1 and Figure 2 There are multiple outer steel frames 1 and multiple inner steel frames 3, and the multiple outer steel frames 1 and multiple inner steel frames 3 are distributed at intervals along the extension direction of the tunnel.
[0034] Specifically: multiple outer steel frames 1 and multiple inner steel frames 3 are distributed at intervals along the extension direction of the tunnel, and each outer steel frame 1 and each inner steel frame 3 is connected to a corresponding corrugated steel pipe 2. That is, along the extension direction of the tunnel, multiple outer steel frames 1 and multiple inner steel frames 3 are distributed correspondingly and are all connected to multiple corrugated steel pipes 2.
[0035] Furthermore, referring to Figure 1 and Figure 2 The adjacent corrugated steel pipes 2 abut against each other, and each corrugated steel pipe 2 is distributed along the extension direction of the tunnel.
[0036] Specifically: Multiple corrugated steel pipes 2 are sequentially arranged along the semi-annular space formed by the outer steel frame 1 and the inner steel frame 3, so that the multiple corrugated steel pipes 2 can be evenly arranged in this space. Each corrugated steel pipe 2 is arranged along the extension direction of the tunnel, so that each corrugated steel pipe 2 is connected to the corresponding multiple outer steel frames 1 and multiple inner steel frames 3.
[0037] In an optional implementation of this embodiment, refer to Figure 1 The large deformation section double-layer steel arch frame sandwiched with steel corrugated pipe flexible support structure also includes concrete filler 4, which is filled between the outer wall of the steel corrugated pipe 2 and the outer steel frame 1 and the inner steel frame 3.
[0038] Specifically: After the corrugated steel pipe 2 is installed, there is a space between the corrugated steel pipe 2 and the outer steel frame 1 and the inner steel frame 3, which is then filled with concrete 4.
[0039] In an optional implementation of this embodiment, refer to Figure 1 The large deformation section double-layer steel arch frame with corrugated steel pipe flexible support structure also includes a tunnel bottom steel frame 6, which is located at the bottom of the outer steel frame 1 and is connected to the corresponding outer steel frame 1.
[0040] Specifically: the tunnel bottom steel frame 6 is located at the bottom of the outer steel frame 1, and there are multiple tunnel bottom steel frames 6. The multiple tunnel bottom steel frames 6 are connected to the corresponding outer steel frame 1, and the connection method can be welding; the tunnel bottom steel frame 6 can be a single-layer HW200 type steel arch frame; after the tunnel bottom steel frame 6 is connected to the outer steel frame 1, a ring structure is formed.
[0041] Furthermore, referring to Figure 1 The double-layer steel arch frame with corrugated steel pipe flexible support structure in the large deformation section also includes invert backfill material 5. The top of the tunnel bottom steel frame 6 is provided with invert backfill material 5, and the top of the invert backfill material 5 is flush with and connected to the bottom of the inner steel frame 3.
[0042] Specifically: After connecting the tunnel bottom steel frame 6 to the corresponding outer steel frame 1, promptly construct the invert arch and set the invert arch backfill material 5. The invert arch backfill material 5 can be materials such as concrete.
[0043] In an optional embodiment of this example, the distance between the outer steel frame 1 and the inner steel frame 3 is 50cm.
[0044] Specifically: the gap between the outer steel frame 1 and the inner steel frame 3 is set to 50cm so that the corrugated steel pipe 2 of the appropriate specifications can be kept in this gap, and concrete filler 4 is injected into the gap.
[0045] In an optional embodiment of this example, all the corrugated steel pipes 2 are high-strength corrugated steel pipes with a diameter of φ30.
[0046] Specifically: multiple corrugated steel pipes 2 are all φ30 high-strength corrugated steel pipes, and adjacent corrugated steel pipes 2 abut against each other to be used for support between two steel frames.
[0047] In an optional embodiment of this example, both the outer steel frame 1 and the inner steel frame 3 are I-beam steel frames.
[0048] Specifically: the outer steel frame 1 can be an HW200 type steel arch frame, and after the initial support construction of the outer layer is completed and the deformation is 10cm, the inner steel frame 3 can be an I20 I-beam steel arch frame.
[0049] In an optional embodiment of this example, the sprayed thickness of the concrete filler 4 is 78 cm.
[0050] Specifically: After the corrugated steel pipe 2 is installed, concrete filler 4 needs to be sprayed at the gap between the corrugated steel pipe 2 and the steel frame, and the spray thickness should be 78cm.
[0051] During construction, circumferential anchor bolts are first installed. This can be achieved by using 8-meter φ32 self-drilling anchor bolts and 4-meter φ42 grouting pipe rings arranged in a staggered, quincunx pattern and then grouting. The reinforcing mesh can be φ8@20 mesh. Next, the outer steel frame 1 and inner steel frame 3 are installed, with a spacing between them. Multiple corrugated steel pipes 2 are installed within this spacing, and concrete filler 4 is then poured into the joints. Furthermore, under the action of high-value deformation pressure, the energy at stress concentration points within the surrounding rock is effectively absorbed, causing the stress in the surrounding rock to redistribute evenly. This allows for good adaptation to surrounding rock deformation, preventing brittle failure such as warping, twisting, and fracture of the steel sections, maintaining the rigidity and load-bearing capacity of the steel, ensuring the initial linearity and axial stress, and guaranteeing the safety of the initial support system.
[0052] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.
Claims
1. A flexible support structure with a double-layer steel arch frame and corrugated steel pipe in a large deformation section, characterized in that, It includes an outer steel frame (1), a corrugated steel pipe (2) and an inner steel frame (3). The outer steel frame (1) and the inner steel frame (3) are both designed as semi-arc structures, and the outer steel frame (1) is fitted on the outside of the inner steel frame (3). The corrugated steel pipe (2) is provided in multiple ways, and the multiple corrugated steel pipes (2) are arranged sequentially in the gap between the outer steel frame (1) and the inner steel frame (3).
2. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 1, characterized in that, The outer steel frame (1) and the inner steel frame (3) are provided in multiples, and the multiple outer steel frames (1) and the multiple inner steel frames (3) are distributed at intervals along the extension direction of the tunnel.
3. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 2, characterized in that, The adjacent corrugated steel pipes (2) abut against each other, and each of the corrugated steel pipes (2) is distributed along the extension direction of the tunnel.
4. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 2, characterized in that, It also includes concrete filler (4), which fills the space between the outer wall of the corrugated steel pipe (2) and the outer steel frame (1) and the inner steel frame (3).
5. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 2, characterized in that, It also includes a tunnel bottom steel frame (6), which is located at the bottom of the outer steel frame (1) and is connected to the corresponding outer steel frame (1).
6. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 5, characterized in that, It also includes an invert backfill (5), the top of the tunnel bottom steel frame (6) is provided with the invert backfill (5), the top of the invert backfill (5) is flush with and connected to the bottom of the inner steel frame (3).
7. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 1, characterized in that, The distance between the outer steel frame (1) and the inner steel frame (3) is 50cm.
8. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 1, characterized in that, All of the steel corrugated pipes (2) are high-strength steel corrugated pipes with a diameter of φ30.
9. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 1, characterized in that, Both the outer steel frame (1) and the inner steel frame (3) are I-beam steel frames.
10. The flexible support structure with double-layer steel arch frame and corrugated steel pipe in the large deformation section according to claim 4, characterized in that, The thickness of the concrete filler (4) is 78 cm.