Primary support steel frame structure for transferring tunnel into tunnel

Abstract

The utility model relates to a primary support steel frame structure for transferring a tunnel, which comprises an inner support component, an outer support component and a steel frame, the left section comprises an inner supporting beam and an inner supporting leg, the inner supporting beam is of an arc-shaped structure, and the inner supporting leg is fixedly installed at the outer end of the inner supporting beam. The middle section comprises an inner supporting beam and a temporary supporting leg, and the temporary supporting leg is fixedly installed at one end of the inner supporting beam. The right section comprises an inner supporting beam, a temporary supporting leg and an inner supporting leg, the inner supporting leg is fixedly installed at the outer end of the inner supporting beam, and the temporary supporting leg is fixedly installed at the inner end of the inner supporting beam. The outer supporting assembly is of a door-shaped structure, comprises three sections corresponding to the inner supporting assembly and is fixedly installed on the outer side of the inner supporting assembly. The outer supporting assembly and the inner supporting assembly of the primary supporting steel frame structure are each divided into a plurality of sections, supporting can be carried out while digging is carried out, and closing is carried out in time; and a shed frame of the pilot tunnel in the tunnel transferring process can be omitted, and the safety of the primary supporting structure is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, and relates to tunnel turning construction, especially a primary support steel frame structure for tunnel turning. Background Technology

[0002] In tunnel engineering, it is often necessary to switch from a branch tunnel to the main tunnel, or to open a side tunnel. This involves switching from a side tunnel to a branch tunnel / main tunnel. For the surrounding rock geology, especially in tunnel sections with relatively broken surrounding rock, the complexity of construction increases exponentially. Among these, the steel arch frame is an important initial support force transmission component, which has a great impact on construction safety.

[0003] Traditional tunnel construction involves using a pilot tunnel to enter the transverse tunnel, setting up a transverse steel arch as temporary support, and then constructing the initial support for the transverse tunnel steel frame. This method has the following problems:

[0004] 1. During the initial excavation process, the excavation cross-section was large, requiring complete excavation before the steel frame could be constructed for support, posing a high safety hazard.

[0005] 2. During the later stages of excavation and support construction, the arch frames on both sides of the pilot tunnel will be dismantled, leaving only the arch top. Usually, several temporary scaffolds are installed under the arch top to support it. The scaffolds are then dismantled after the subsequent construction is completed. This process is cumbersome, wastes materials, and reduces construction efficiency.

[0006] To address these issues, we propose a primary support steel frame structure for tunnel transitions. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a simple and easy-to-use initial support steel frame structure for tunnel turning.

[0008] To solve the above problems, the technical solution of this utility model is as follows:

[0009] A primary support steel frame structure for tunnel transition, comprising:

[0010] The internal support assembly is an arched structure, consisting of a left section, a middle section, and a right section;

[0011] The left section includes an inner support beam and an inner support leg. The inner support beam has an arc structure, and the inner support leg is fixedly installed at the outer end.

[0012] The middle section includes an inner support beam and a temporary support leg, with the temporary support leg fixedly installed at one end of the inner support beam;

[0013] The right section includes an inner support beam, a temporary support leg, and an inner support leg. The inner support leg is fixedly installed at the outer end of the inner support beam, and the temporary support leg is fixedly installed at the inner end.

[0014] The outer support assembly is a portal-shaped structure, consisting of three sections corresponding to the inner support assembly, and is fixedly installed on the outside of the inner support assembly.

[0015] In a further embodiment, the temporary outrigger in the middle section is located on the side closer to the left section.

[0016] In a further embodiment, several internal support beams form a complete arc-shaped structure.

[0017] In a further embodiment, the inner support beam is fitted with temporary support legs via connecting legs.

[0018] In a further embodiment, some connecting legs have different lengths, while some temporary support legs have the same length.

[0019] In a further embodiment, the outer support assembly includes a pair of outer support legs, a plurality of reinforcing supports, and a plurality of outer support beams. The plurality of outer support beams are fixedly installed together in sequence, and the outer support beams are fixedly installed on the inner support beams by a plurality of reinforcing supports.

[0020] One pair of outer support legs are fixedly installed at the outer ends of several outer support beams.

[0021] In a further embodiment, a pair of outer support legs are fixedly mounted on the outside of a pair of inner support legs.

[0022] In a further embodiment, several arch support legs are fixedly installed at intervals on the top of the outer support beam.

[0023] In a further embodiment, the number of outer support beams is the same as the number of inner support beams;

[0024] The length of the outer support beam corresponds to the length of the inner support beam.

[0025] In a further embodiment, the top end of the connecting leg and the bottom end of the reinforcing support are both arc-shaped structures, corresponding to the inner support beam.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] 1. The external and internal support components of this initial support steel frame structure are divided into several sections, which can be supported as excavation progresses, completed in one go, and closed in a timely manner, reducing the amount of excavation per operation. Furthermore, it can eliminate the need for the scaffolding of the guide tunnel during tunnel transition. After cutting one side of the guide tunnel arch, a section of the external and internal support components can be installed immediately, which greatly improves the safety of the initial support structure. At the same time, it avoids repeated operations, reduces the time of a single cycle of tunnel transition construction, shortens the time workers spend on site, reduces disturbance to the surrounding rock, and thus improves the safety index during construction.

[0028] 2. This initial support steel frame structure includes an external support assembly and an internal support assembly. The external support assembly is fixedly installed on the outside of the internal support assembly. The external support assembly is a portal frame structure, and the internal support assembly is an arch structure, which improves the structural strength, strengthens the support force, ensures the quality of the initial support structure, and has good stability.

[0029] 3. Temporary supports are fixedly installed at the bottom ends of several internal support beams of the initial support steel frame structure through connecting legs. The lengths of the temporary supports are the same. After the completion of the next section of the initial support steel frame, the temporary supports of the previous section can be removed, so that the temporary supports can be reused in subsequent construction processes, saving material costs. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an initial support steel frame structure used for tunnel turning;

[0031] Figure 2 This is a schematic diagram of the internal support component of an initial support steel frame structure used for tunnel turning.

[0032] In the diagram: 1. External support assembly; 11. External support leg; 12. Reinforced support; 13. External support beam; 14. Arch support leg; 2. Internal support assembly; 21. Temporary support leg; 22. Internal support beam; 23. Internal support leg; 24. Connecting leg. Detailed Implementation

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] Example 1:

[0035] A primary support steel frame structure for tunnel transition, such as Figure 1 , Figure 2 As shown, it includes an outer support component 1 and an inner support component 2. The inner support component 2 is fixedly installed on the inner side of the outer support component 1. The outer support component 1 has a gate-shaped structure, and the inner support component 2 has an arch-shaped structure.

[0036] like Figure 1 , Figure 2 As shown, the inner support assembly 2 is divided into several segments, the number of which is determined by the cross-sectional size. The inner support assembly 2 includes several temporary support legs 21, several inner support beams 22, a pair of inner support legs 23, and several connecting legs 24. The inner support beams 22 are arc-shaped structures, and the connection of the inner support beams 22 together forms a complete and smooth arc structure. Steel plates are fixedly installed at both ends of the inner support beams 22 for easy installation together by bolts. The outer ends of the two outermost inner support beams 22 are fixedly installed with inner support legs 23. The bottom ends of the inner support beams 22 are welded to the top ends of the connecting legs 24. The connecting legs 24 are close to the ends of the inner support beams 22 and are connected to the ends of the inner support beams 22. The sections are spaced apart to ensure sufficient space for installing temporary support legs 21 without affecting steel plate welding; the top of the connecting leg 24 has an arc-shaped structure corresponding to the arc of the inner support beam 22; the bottom end of the connecting leg 24 is fixedly installed with the temporary support leg 21, and steel plates are fixedly installed on both the bottom end of the connecting leg 24 and the top end of the temporary support leg 21 and connected together by bolts. The lengths of the connecting legs 24 are different, while the lengths of the temporary support legs 21 are the same. After the temporary support legs 21 of the next section of the support are completed, the temporary support legs 21 of the previous section can be removed and reused in subsequent construction; the connecting legs 24 and the temporary support legs 21 must not be covered during shotcrete construction, and rigid materials can be used for protection. Preferably, the connecting leg 24 is an irregularly shaped I-beam, and the temporary support leg 21 is a regular I-beam.

[0037] The outer support assembly 1 is divided into several segments, the number of which is the same as the number of segments in the inner support assembly 2, and the segments are positioned accordingly. The outer support assembly 1 includes a pair of outer support legs 11, several reinforcing supports 12, several outer support beams 13, and several arch support legs 14. Several outer support beams 13 are fixedly installed together in sequence. The outer ends of the two outermost outer support beams 13 are fixedly installed with outer support legs 11. A pair of outer support legs 11 are located outside a pair of inner support legs 23 and are welded together with the pair of inner support legs 23. The bottom ends of several reinforcing supports 12 are welded to the top ends at intervals at the bottom ends of the outer support beams 13. The bottom ends of several reinforcing supports 12 are welded to the top ends of the inner support beams 22. The bottom ends of the reinforcing supports 12 are arc-shaped and correspond to the arc of the inner support beams 22, which facilitates strengthening the inner support assembly 2 and the outer support assembly 1 and connecting the two into a whole. Several arch support legs 14 are welded to the top ends of the outer support beams 13 at intervals to connect the steel arches and facilitate the lowering and installation of the steel arches.

[0038] During the processing, each component is pre-processed. During the processing, the arch support leg 14, the reinforcing support 12, the outer support beam 13, and the inner support beam 22 are welded together, and each section is trial-assembled to ensure that each section fits and to avoid mismatch during the installation process.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A primary support steel frame structure for a tunnel diversion tunnel, characterized by, Comprise: The inner support assembly (2) is an arch structure, comprising a left section, a middle section and a right section; The left section comprises an inner support beam (22) and an inner support leg (23), the inner support beam (22) is an arc structure, and the outer end is fixedly installed with the inner support leg (23); The middle section comprises the inner support beam (22) and a temporary support leg (21), one end of the inner support beam (22) is fixedly installed with the temporary support leg (21); The right section comprises the inner support beam (22), the temporary support leg (21) and the inner support leg (23), the outer end of the inner support beam (22) is fixedly installed with the inner support leg (23), and the inner end is fixedly installed with the temporary support leg (21); The outer support assembly (1) is a door type structure, comprising three sections corresponding to the inner support assembly (2), and is fixedly installed on the outer side of the inner support assembly (2).

2. The primary steel frame structure for a tunnel transfer tunnel according to claim 1, wherein The temporary support leg (21) of the middle section is located close to one side of the left section.

3. The primary steel support structure for a tunnel crossover according to claim 2, wherein Several inner support beams (22) form a complete arc structure.

4. The primary steel support structure for a tunnel crossover according to claim 3, wherein The inner support beam (22) is installed with the temporary support leg (21) through the connecting leg (24).

5. The primary steel support structure for a tunnel transition according to claim 4, wherein, The lengths of several connecting legs (24) are different, and the lengths of several temporary support legs (21) are the same.

6. The primary steel support structure for a tunnel crossover according to claim 5, wherein The outer support assembly (1) comprises a pair of outer support legs (11), several reinforcing supports (12) and several outer support cross beams (13), several outer support cross beams (13) are fixedly installed in sequence, the outer support cross beam (13) is fixedly installed on the inner support beam (22) through several reinforcing supports (12); A pair of outer support legs (11) are fixedly installed at the outer ends of several outer support cross beams (13) respectively.

7. The primary steel support structure for a tunnel transition according to claim 6, wherein A pair of outer support legs (11) are fixedly installed on the outer side of a pair of inner support legs (23).

8. The primary steel support structure for a tunnel transition according to claim 7, wherein, The top end of the outer support cross beam (13) is fixedly installed with several arch support legs (14) at intervals.

9. The primary steel support structure for a tunnel transition according to claim 8, wherein, The number of outer support cross beams (13) is the same as the number of inner support beams (22); The length of the outer support cross beam (13) corresponds to the length of the inner support beam (22).

10. The primary steel support structure for a tunnel transition according to claim 9, wherein, The top end of the connecting leg (24) and the bottom end of the reinforcing support (12) are arc structures corresponding to the inner support beam (22).

Images