Automatic support changing device of open cut tunnel trolley

Abstract

The utility model discloses an automatic support changing device of an open cut tunnel trolley, and belongs to the technical field of tunnel construction. The device comprises a steel support and a connecting lug plate, the steel support comprises a middle section, a fixed end and a movable end, the fixed end and the movable end are connected to the two ends of the middle section through a flange and a bolt respectively, the movable end is of a telescopic structure, and the movable end is provided with a hydraulic oil cylinder capable of driving the movable end to stretch out and draw back. The bottoms of two upper longitudinal beams of a portal of the open-cut tunnel trolley are correspondingly connected with the connecting lug plates respectively, and the two ends of the steel support are suspended below the upper longitudinal beams of a lower portal of the open-cut tunnel trolley through the connecting lug plates respectively. The device is simple in structure, convenient to operate, high in construction efficiency and capable of shortening the construction period and reducing the construction cost.

Description

Technical Field

[0001] The utility model relates to an automatic strut-changing device for an open-cut tunnel jumbo, belonging to the technical field of tunnel construction. Background Technique

[0002] At present, with the rapid development of railway construction, the proportion of tunnels is continuously increasing. With the emergence of poor geology, the support parameters of tunnels are also strengthened, bringing high construction risks, high operation intensity, and great difficulty to tunnel construction. Only by improving the utilization rate of mechanization or advanced tooling can the construction efficiency be better improved, the effective support for open-cut tunnels be accelerated, and the safety risks of tunnel construction be reduced.

[0003] After the side wall construction of the secondary lining structure of the open-cut tunnel is completed and the steel strut-changing is erected, the upper support can be removed before constructing the structural roof slab. In the traditional construction process, after the steel support is erected, restricted by the support system, the steel support strut-changing cannot be removed in time, resulting in high material input costs, difficult removal processes, and long construction periods. Content of the Utility Model

[0004] Aiming at the above defects existing in the prior art, the utility model provides an automatic strut-changing device for an open-cut tunnel jumbo that can improve construction efficiency and reduce construction costs.

[0005] The utility model is realized by the following technical solutions: an automatic strut-changing device for an open-cut tunnel jumbo, characterized in that: it includes a steel support and connecting ear plates. The steel support includes an intermediate section, a fixed end, and a movable end. The fixed end and the movable end are respectively connected to both ends of the intermediate section through flanges and bolts. The movable end is a telescopic structure, and a hydraulic cylinder capable of driving its telescopic movement is arranged on the movable end. The connecting ear plates are respectively connected to the bottoms of two upper longitudinal beams of the gantry of the open-cut tunnel jumbo, and both ends of the steel support are suspended below the upper longitudinal beams of the lower gantry of the open-cut tunnel jumbo through the connecting ear plates.

[0006] In the utility model, the steel support is arranged on the open-cut tunnel jumbo. During work, after the jumbo is in place, the steel support starts to work. A certain prestress is applied to the movable end of the steel support through the hydraulic cylinder arranged on the movable end of the steel support to support the side wall, and then the arch crown structure can be constructed. After the arch crown structure reaches the design strength, the prestress of the steel support is unloaded, and then the support of the upper enclosure structure can be removed.

[0007] Furthermore, to improve the adaptability of the steel support, the intermediate section is composed of standard sections connected. Both ends of the standard sections are provided with flanges, and the standard sections are connected into one body through bolts.

[0008] Furthermore, rubber pads are provided at both ends of the steel support. By providing the rubber pads, the damage of the steel support to the main structure during the axial force application of the hydraulic cylinder can be reduced.

[0009] Furthermore, the steel support is made of a steel pipe with a wall thickness of 16 mm.

[0010] Furthermore, to facilitate the replacement of steel supports of different specifications and ensure that the replacement support remains on the design center line, the connecting ear plates are welded and fixed on a connecting plate, and the connecting plate is connected to the bottom of the upper longitudinal beam of the lower gantry of the open-cut tunnel trolley by bolts. When replacing steel supports of different specifications, the center line position of the steel support is ensured by replacing the corresponding connecting ear plates. Fixing the connecting ear plates on the connecting plate is convenient for replacement.

[0011] Furthermore, the steel support is connected to the connecting ear plate by a steel wire rope.

[0012] Furthermore, connecting ears are welded at both ends of the steel support, and the steel support is connected to the connecting ear plate at the bottom of the upper longitudinal beam of the lower gantry of the open-cut tunnel trolley through its connecting ears by pin shafts.

[0013] The beneficial effects of the present utility model are as follows: The structure of the present utility model is simple, the operation is convenient, the construction efficiency is high, the construction period can be shortened, and the construction cost can be reduced; the steel support in the present utility model is arranged on the open-cut tunnel trolley, and the steel support carried by the trolley is responsible for the replacement support construction of the whole section. The construction is convenient and fast, and the rental quantity of the steel support can be greatly reduced. At the same time, during the construction process of the present utility model, all operations are carried out inside the trolley, avoiding processes such as disassembly and installation of the steel support, improving the construction efficiency, ensuring construction safety, and reducing the labor intensity of workers; the steel support in the present utility model is arranged on the trolley, and the top formwork and the steel replacement support can be constructed integrally. The upper support can be removed after the replacement support is erected first, and the arch top is constructed simultaneously, which not only ensures the safety of the foundation pit but also ensures the orderly progress of the on-site construction. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present utility model;

[0015] Figure 2 is the side view schematic diagram of the present utility model;

[0016] Figure 3 is Figure 2 the enlarged schematic diagram of part E in

[0017] Figure 4 is the structural schematic diagram of the steel support in the present utility model;

[0018] Figure 5 is the structural schematic diagram of the movable end of the steel support in the present utility model;

[0019] Figure 6 is Figure 5 the schematic cross-sectional view taken along line B-B in

[0020] Figure 7 is the schematic end view of the movable end support leg of the steel support in the present utility model;

[0021] Figure 8 is Figure 7 the schematic cross-sectional view taken along line C-C in

[0022] Figure 9 is Figure 7 the schematic cross-sectional view taken along line D-D in

[0023] Figure 10 is the schematic structural view of the steel support in the present utility model with multiple standard sections;

[0024] Figure 11 is the schematic view of the connection between the connecting ear plate and the connecting plate in the present utility model;

[0025] In the figure, 1. Open-cut tunnel jumbo, 1.1. Upper longitudinal beam of the lower gantry; 2. Steel support, 2.1. Fixed end, 2.2. Intermediate section, 2.2.1. Standard section, 2.3. Movable end, 2.3.1. Movable end steel pipe, 2.3.2. Movable end support leg, 2.3.2.1. Support foot plate; 3. Connecting ear plate, 4. Pin shaft, 5. Hydraulic cylinder, 6. Steel wedge block, 7. Connecting plate. Specific embodiments

[0026] The present utility model will be further described below through non-limiting embodiments in conjunction with the accompanying drawings:

[0027] As shown in the attached drawings, an automatic strut-changing device for an open-cut tunnel jumbo includes a steel support 2 and connecting ear plates 3. The steel support 2 is made of a steel pipe with a wall thickness of 16 mm. According to the support requirements, the diameter of the steel support 2 is generally φ800 mm or φ609 mm. The steel support 2 includes an intermediate section 2.2, a fixed end 2.1, and a movable end 2.3. The fixed end 2.1 and the movable end 2.3 are respectively connected to both ends of the intermediate section 2.2. Flanges are respectively provided at both ends of the intermediate section 2.2, and flanges are also respectively provided at the connection ends of the fixed end 2.1 and the movable end 2.3 with the intermediate section 2.2. The fixed end 2.1 and the movable end 2.3 are respectively connected to the intermediate section 2.2 through flanges and high-strength bolts. The movable end 2.3 is a telescopic structure, which includes a movable-end steel pipe 2.3.1 and a movable-end support foot 2.3.2. A slideway is formed in the movable-end steel pipe 2.3.1 by welding steel plates. The movable-end support foot 2.3.2 is made by welding steel plates. One end of the movable-end support foot 2.3.2 is slidably arranged in the slideway of the movable-end steel pipe 2.3.1, and the other end of the movable-end support foot 2.3.2 is located outside the movable-end steel pipe 2.3.1. A support plate 2.3.2.1 is welded to the end of the movable-end support foot 2.3.2 located outside. Two hydraulic cylinders 5 are arranged symmetrically between the support plate 2.3.2.1 and the movable-end steel pipe 2.3.1. The connecting ear plates 3 are respectively and correspondingly connected to the bottoms of two upper longitudinal beams 1.1 of the lower gantry of the open-cut tunnel jumbo. The connecting ear plates 3 are made of steel plates with a thickness of 15 mm. Both ends of the steel support 2 are respectively suspended below the upper longitudinal beams 1.1 of the lower gantry of the open-cut tunnel jumbo through the connecting ear plates 3. When the steel support 2 is suspended, steel wires can be respectively arranged at both ends thereof, and the steel wires are connected to the connecting ear plates 3 through pin shafts 4. Alternatively, connecting ears can be respectively welded at both ends of the steel support 2, and the steel support 2 is connected to the connecting ear plates 3 through its connecting ears by means of pin shafts 4. In order to reduce the damage of the steel support to the main structure during the process of applying axial force to the support, rubber pads can be arranged at both ends of the steel support 2, and the thickness of the rubber pads is 15 mm.

[0028] As Figure 11 shown, for facilitating the replacement of steel supports 2 of different specifications and ensuring that the strut change is kept on the design center line, it is preferred that the connecting ear plates 3 are welded and fixed on a connecting plate 7. The connecting plate 7 is 500 mm long and 330 mm wide. The connecting plate 7 is connected to the bottom of the upper longitudinal beam of the lower gantry of the open-cut tunnel jumbo through bolts. When replacing steel supports 2 of different specifications, the position of the center line of the steel support is ensured by replacing the corresponding connecting ear plates of appropriate specifications. The connecting ear plates 3 are fixed on the connecting plate 7, which is convenient for replacement.

[0029] As Figure 10As shown in the figure, to improve the adaptability of the steel support, it is preferred that the intermediate section 2.2 is composed of standard sections 2.2.1 connected together. Flanges are provided at both ends of the standard section 2.2.1, and the standard sections 2.2.1 are connected into one body by bolts. The length of the standard section 2.2.1 can be designed to be different according to needs and assembled and connected for use according to the specific construction conditions on site, which can improve the adaptability of the steel support and increase its turnover utilization rate.

[0030] During the construction using the present utility model, the steel support 2 is reliably connected to the trolley through the connecting ear plate 3, and the preparatory work before the erection of the support is done well. The number of the steel supports 2 is determined according to the design. After the trolley is in place, the steel support 2 starts to work. A certain prestress is applied to the flexible end of the steel support 2 through the hydraulic cylinder 5 provided at the flexible end of the steel support 2. After the prestress is applied in place, the steel wedge block 6 can be placed to fix the flexible end support foot 2.3.2. The side wall is supported by the steel support 2, and then the arch crown structure can be constructed. After the arch crown structure reaches the design strength, the prestress of the steel support is unloaded, and then the support of the upper enclosure structure can be removed.

[0031] The structure of the present utility model is simple, and it can operate synchronously with the trolley system. During operation, the hydraulic cylinder 5 is directly used to apply prestress to the flexible end of the steel support. When not in operation, the support stress is unloaded. The operation is convenient, avoiding the cumbersome construction procedures such as disassembly and installation of the steel support, realizing the convenient lifting and installation of heavy objects in a narrow space, improving the construction efficiency, and ensuring construction safety. The position of the steel support carried by the trolley is consistent with the design requirements, which can avoid affecting the force of the overall structure due to large errors in the support spacing and height, and can improve the construction safety.

[0032] Other parts in this embodiment are all prior arts and will not be elaborated here.

Claims

1. An automatic strut-changing device for an open-cut tunnel jumbo, characterized in that: It includes a steel support (2) and connecting lugs (3). The steel support (2) includes an intermediate section (2.2), a fixed end (2.1), and a movable end (2.3). The fixed end (2.1) and the movable end (2.3) are respectively connected to both ends of the intermediate section (2.2) through flanges and bolts. The movable end (2.3) is a telescopic structure, and a hydraulic cylinder (5) capable of driving its telescoping is provided on the movable end (2.3). The connecting lugs (3) are respectively connected to the bottoms of two upper longitudinal beams of the lower gantry of the open-cut tunnel trolley. Both ends of the steel support (2) are suspended below the upper longitudinal beams of the lower gantry of the open-cut tunnel trolley through the connecting lugs (3).

2. The automatic strut changing device for the open-cut tunnel jumbo according to claim 1, characterized in that: The intermediate section (2.2) is composed of standard sections connected together. Flanges are provided at both ends of the standard sections, and the standard sections are connected into one body through bolts.

3. The automatic strut-changing device of the open-cut tunnel jumbo according to claim 1, characterized in that: Rubber pads are provided at both ends of the steel support (2).

4. The automatic strut-changing device for the open-cut tunnel jumbo according to claim 1 or 2 or 3, characterized in that: The steel support (2) is made of a steel pipe with a wall thickness of 16 mm.

5. The automatic strut-changing device for the open-cut tunnel jumbo according to claim 1 or 2 or 3, characterized in that: The connecting lug (3) is welded and fixed on a connecting plate (7), and the connecting plate (7) is connected to the bottom of the upper longitudinal beam of the lower gantry of the open-cut tunnel trolley through bolts.

6. The automatic strut-changing device of the open-cut tunnel jumbo according to claim 5, characterized in that: The steel support (2) is connected to the connecting lug (3) through a steel wire rope.

7. The automatic strut-changing device of the open-cut tunnel jumbo according to claim 5, characterized in that: Connecting ears are welded at both ends of the steel support (2), and the steel support (2) is connected to the connecting lug (3) at the bottom of the upper longitudinal beam of the lower gantry of the open-cut tunnel trolley through its connecting ears by using a pin shaft.

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