Underground cavern arch frame structure with attached arches

Abstract

The utility model provides an underground cavern lagging jack structure with an attached arch, which comprises a basic frame formed by lagging jack upright posts and lagging jack top beams, and the attached arch is arranged between the lagging jack top beams and surrounding rock. The utility model has the advantages that the structure is simple, effective, safe and firm, so that the arch frame structure can be tightly attached to the rock surface to form a uniform stress structure.

Description

Technical Field

[0001] The utility model relates to the technical field of underground chamber engineering, and particularly relates to an arch frame structure of an underground chamber with an attached arch. Background Art

[0002] In water conservancy and hydropower projects, for the tunnel sections of IV-V class surrounding rocks in underground chambers, in order to ensure the stability of the surrounding rocks and the safety of on-site construction, it is often necessary to set up steel arch frames for strengthening support. When there are faults and joints in the tunnel that cut each other, resulting in block falling and collapse, and thus serious over-excavation, the gap between the steel arch frame and the surrounding rock is relatively large, and it cannot be closely attached to the rock surface, so the support effect is poor and the purpose of strengthening support cannot be achieved.

[0003] Therefore, design optimization is needed to effectively connect the top of the arch frame with the surrounding rock to form a unified integral stress member. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an arch frame structure of an underground chamber with an attached arch, which has a simple structure, is safe and reliable.

[0005] In order to achieve the above purpose, the utility model is realized through the following technical solutions:

[0006] An arch frame structure of an underground chamber with an attached arch includes a basic framework formed by arch frame columns and an arch frame top beam, and an attached arch is arranged between the arch frame top beam and the surrounding rock.

[0007] Further, the attached arch is connected to the arch frame top beam through a connecting steel plate, and the attached arch and the arch frame top beam are respectively welded and fixed to the connecting steel plate.

[0008] Further, there are two connecting steel plates, which are connected and fixed into one body through bolts.

[0009] Further, the attached arch is connected to the surrounding rock through a support steel plate, and the attached arch is welded and fixed to the support steel plate.

[0010] Further, the surface of the surrounding rock is leveled with leveling mortar, and the support steel plate is welded and fixed to the surrounding rock.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The arch frame structure of an underground chamber with an attached arch of the utility model has a simple and effective structure, is safe and reliable, enables the arch frame structure to be closely attached to the rock surface, and forms a unified stress structure. Brief Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2It is a schematic diagram of the connection structure of the attached arch of the present utility model.

[0015] Figure 3 It is a schematic diagram of the connection structure between the attached arch and the connecting steel plate of the present utility model.

[0016] Figure 4 It is a schematic diagram of the connection structure between the top beam of the arch frame and the connecting steel plate of the present utility model.

[0017] Figure 5 It is a schematic diagram of the connection structure between the attached arch and the supporting steel plate of the present utility model.

[0018] Reference numerals: 1, arch frame column; 2, arch frame top beam; 3, foot-locking bolt; 4, waist-locking bolt; 5, arch-locking bolt; 6, attached arch; 7, connecting steel plate; 8, bolt; 9, leveling mortar; 10, supporting steel plate. Detailed implementation manners

[0019] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings.

[0020] When the over-excavation of the cavern is relatively serious, the gap between the top beam 2 of the arch frame and the surrounding rock is relatively large and cannot be closely attached, and it cannot play an effective supporting role. The present utility model is designed to set a steel arch attached arch 6 between the top beam 2 of the arch frame and the surrounding rock.

[0021] As Figure 1 shown, an underground cavern arch frame structure with an attached arch includes a basic framework formed by an arch frame column 1 and an arch frame top beam 2, and an attached arch 6 is arranged between the arch frame top beam 2 and the surrounding rock. The arch frame column 1 is connected to the surrounding rock by a foot-locking bolt 3 and a waist-locking bolt 4, and the arch frame top beam 2 is connected to the surrounding rock by an arch-locking bolt 5.

[0022] As Figure 2 、 3 、4 shown, the attached arch 6 is connected to the arch frame top beam 2 through a connecting steel plate 7, and the attached arch 6 and the arch frame top beam 2 are respectively welded and fixed to the connecting steel plate 7. The connecting steel plate 7 is two pieces and is connected and fixed into one body by bolts 8.

[0023] As Figure 2 、 5 shown, the attached arch 6 is connected to the surrounding rock through a supporting steel plate 10, and the attached arch 6 is welded and fixed to the supporting steel plate 10. In order to better connect and fix the top of the attached arch 6 to the surrounding rock, the surface of the surrounding rock is leveled with leveling mortar 9, and the supporting steel plate 10 is welded and fixed to the surrounding rock.

[0024] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. An underground cavern arch structure with an attached arch, comprising a basic frame formed by arch columns and arch top beams, characterized in that: An auxiliary arch is arranged between the top beam of the arch frame and the surrounding rock.

2. The underground cavern arch frame structure with attached arch according to claim 1, characterized in that: The attached arch is connected to the top beam of the arch frame via a connecting steel plate, and the attached arch and the top beam of the arch frame are respectively welded and fixed to the connecting steel plate.

3. The underground cavern arch frame structure with attached arch according to claim 2, characterized in that: The connecting steel plates are composed of two pieces and are fixed together by bolt connection.

4. The underground cavern arch frame structure with attached arch according to claim 1, characterized in that: The attached arch is connected to the surrounding rock through a supporting steel plate, and the attached arch is fixed to the supporting steel plate by welding.

5. The underground cavern arch frame structure with attached arches according to claim 4, characterized in that: The surface of the surrounding rock is smoothed with leveling mortar, and the supporting steel plate is welded and fixed to the surrounding rock.

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