Small-section underground excavation tunnel bench method excavation trolley lifting installation structure

Abstract

The utility model discloses a lifting and mounting structure for a benching method excavation trolley of a small-section underground excavation tunnel. The lifting and mounting structure comprises a fixed support platform and the benching method excavation trolley. The fixed support platform is composed of two rows of vertically fixed supporting steel frames which are arranged on a tunnel bottom plate in the longitudinal direction of a tunnel. The bench method excavation trolley comprises a plurality of groups of door-shaped steel truss combined structures, and each steel truss combined structure comprises a plurality of two rows of supporting columns which are vertically arranged and arranged in parallel and connecting cross beams which are located between every two adjacent supporting columns and arranged at the top ends of the supporting columns. The double-spliced I-shaped steel cross beam is detachably arranged between the supporting columns which are transversely arranged in the front row and is connected with the lower parts of the supporting columns; a supporting column of the bench method excavation trolley is fixed to the supporting steel frame of the fixed support platform. According to the lifting installation structure, by means of the transformed movable cross beam and the fixed support platform of the trolley, the problem of vehicle transportation in the tunnel when the trolley excavated through the bench method cannot be moved out of the tunnel under the bench method construction condition is solved, and the structure can be repeatedly used.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway tunnel construction, and particularly relates to the technical field of small-section tunnel excavation by the drift method, and specifically, it is a lifting and installation structure of a bench excavation trolley for small-section mined-out tunnels. Background Technique

[0002] In recent years, the number of tunnel construction projects in China has been increasing, and the construction application scenarios of the drift method have also been increasing. When constructing long-distance tunnels, due to the surrounding rock conditions or construction safety considerations, it is impossible to wait until the initial support of the tunnel excavation is completed before carrying out the secondary lining construction. Often, when the excavation reaches a certain length, the secondary lining construction starts. When the bench method is used for excavation in the tunnel, the height of the bench excavation trolley is not enough for vehicles in the tunnel to pass through, and there is a problem that the secondary lining trolley at the exit direction cannot transfer the bench excavation trolley out of the tunnel. At this time, the driving passage in the tunnel will be completely blocked, resulting in a construction stop. Therefore, how to solve the problem of traffic in the tunnel during bench excavation and improve the construction efficiency is the key point in the drift method construction. Summary of the Invention

[0003] The utility model discloses a lifting and installation structure of a bench excavation trolley for small-section mined-out tunnels. The purpose of the utility model is to provide a lifting and installation structure of a bench excavation trolley, which utilizes the limited space in the small-section tunnel, obtains materials on-site, processes the existing steel support in the tunnel, raises the height of the trolley, solves the problem that the bench excavation trolley obstructs the logistics channel in the tunnel during the bench method construction of small-section mined-out tunnels, and ensures the construction efficiency.

[0004] In order to achieve the above object, the utility model adopts the following technical solutions:

[0005] A lifting and installation structure of a bench excavation trolley for small-section mined-out tunnels, characterized in that: it includes a fixed support platform and a bench excavation trolley;

[0006] The fixed support platform is composed of two rows of vertically fixed support steel frames arranged on the tunnel floor along the longitudinal direction of the tunnel;

[0007] The bench excavation trolley includes a multi-group gantry steel truss combined structure, and the steel truss combined structure includes: multiple vertically arranged and parallel two-row columns, a connecting cross beam located between adjacent columns and arranged at the top of the columns, and a double-pin I-beam cross beam detachably arranged between the horizontally arranged columns in the front row and connected to the lower part of the columns;

[0008] The columns of the bench excavation trolley are fixed on the support steel frames of the fixed support platform.

[0009] Furthermore, the lower ends of the supporting steel frames of the fixed support platform are fixed to the tunnel floor through embedded steel bars, and are fixed to the tunnel floor through U-shaped locking steel bars.

[0010] Furthermore, the double-piece I-beam cross beam is connected and fixed to the pillar through a detachable plug-in structure via a cross beam triangular plate and a high-strength pin shaft respectively arranged on the inner side of the pillar.

[0011] Furthermore, the crossbeam triangle plate is arranged as an upper and lower combined structure on the inner side of each pillar, the double I-beam crossbeam is located between the upper and lower triangle plates, and is connected and fixed by a high-strength pin shaft passing through the upper and lower triangle plates and the double I-beam crossbeam.

[0012] Furthermore, the pillars of the step method excavation trolley are fixed by U-shaped grooves formed by vertical supporting steel and transverse connecting steel on the supporting steel frame of the fixed support platform.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model solves the problem of vehicle transportation in the tunnel when the step method excavation trolley cannot be moved out of the tunnel under the step method construction conditions by means of the modified movable cross beam and fixed support platform of the trolley for small-section dark excavation tunnel. The utility model can be reused.

[0015] The utility model is adopted to carry out the small-section dark-digging tunnel construction by using the step-method excavation trolley lifting and installation structure. The modified and lifted step-method excavation trolley can effectively improve the kinetic energy transportation capacity, and the construction is convenient, the construction cost is low, the process is simple, and the overall construction efficiency is accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of the installation structure of the utility model;

[0017] Figure 2 It is a schematic longitudinal section diagram of the installation structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the modification of the step method excavation trolley of the utility model;

[0019] Figure 4 It is a schematic diagram of the movement of a trolley loader for step-method excavation of the utility model.

[0020] Reference numerals in the figure: 1-U-shaped locking foot steel bar, 2-embedded steel bar, 3-double-jointed I-beam crossbeam, 4-fixed support platform, 5-step excavation trolley, 6-crossbeam triangle plate, 7-high-strength pin shaft, 8-tunnel floor. DETAILED DESCRIPTION

[0021] The present utility model will be further described in conjunction with specific embodiments. The specific embodiments are further explanations of the principles of the present utility model and do not limit the present utility model in any way. The same or similar technologies to the present utility model do not exceed the scope of protection of the present utility model.

[0022] As Figures 1 to 4 shown, a lifting and installation structure of a bench cut method excavation trolley for a small cross-section mined tunnel of the present utility model includes: U-shaped locking foot steel bars 1, embedded steel bars 2, double-rolled I-beam crossbeams 3, fixed support platforms 4, bench cut method excavation trolleys 5, crossbeam triangular plates 6, and high-strength pin shafts 7. The fixed support platform 4 is fabricated by welding and fixed on the tunnel floor through U-shaped locking foot steel bars 1 and embedded steel bars 2. The crossbeam triangular plates 6 are fixed on the bench cut method excavation trolley 5 by welding. The double-rolled I-beam crossbeams 3 are fixed on the bench cut method excavation trolley 5 through the crossbeam triangular plates 6 and high-strength pin shafts 7.

[0023] Using this auxiliary device for installing the arch top steel plate can solve the problem that the bench cut method excavation trolley obstructs the logistics passage in the tunnel during the bench cut method construction of a small cross-section mined tunnel. The specific steps are as follows:

[0024] (1) Process the bench cut method excavation trolley 5 according to the tunnel dimensions and bench height. Weld the crossbeam triangular plates 6 at the lower part of the bench cut method excavation trolley 5, and install the double-rolled I-beam crossbeams 3 using high-strength pin shafts 7.

[0025] (2) Process the fixed support platform 4 according to the dimensions of the processed bench cut method excavation trolley 5. Embed the steel bars 2 at a suitable position in the tunnel, and fix the fixed support platform 4 through the U-shaped locking foot steel bars 1 and the embedded steel bars 2.

[0026] (3) Insert the loader bucket between the top crossbeam of the bench cut method excavation trolley 5 and the double-rolled I-beam crossbeams 3. The main function of the double-rolled I-beam crossbeams 3 is to fix the position of the loader bucket and avoid potential safety risks such as slipping and overturning of the bench cut method excavation trolley 5 when the loader lifts the bench cut method excavation trolley.

[0027] (4) Place the bench cut method excavation trolley 5 on the fixed support platform 4, remove the high-strength pin shafts 7 and the double-rolled I-beam crossbeams 3 to ensure the passing height below the trolley.

[0028] (5) After the vehicle has passed, when entering the excavation process, install the double-rolled I-beam crossbeams 3, and use the loader to move the trolley to the heading face for construction.

[0029] (6) When vehicle passage is required, repeat steps (3) to (5) until the excavation process in the tunnel is completed, and recover the fixed support platform 4 and the bench cut method excavation trolley 5.

Claims

1. A small-section dark-digging tunnel step method excavation trolley lifting and installation structure, characterized in that: Including fixed support platform and step method excavation trolley; The fixed support platform is composed of two rows of vertically fixed supporting steel frames arranged on the tunnel floor along the longitudinal direction of the tunnel; The step method excavation trolley includes a plurality of gate-shaped steel truss composite structures, which include: a plurality of vertically arranged and parallel two rows of pillars, and a connecting crossbeam located between each adjacent pillar and arranged at the top of the pillar, and a double-jointed I-beam crossbeam detachably arranged between the front-row laterally arranged pillars and connected to the lower part of the pillars; The support pillars of the step method excavation trolley are fixed on the supporting steel frame of the fixed support platform.

2. The lifting and installation structure of the small-section dark-digging tunnel step method excavation trolley according to claim 1 is characterized in that: The lower ends of the supporting steel frames of the fixed support platform are fixed to the tunnel floor through embedded steel bars and fixed to the tunnel floor through U-shaped locking steel bars.

3. The lifting and installation structure of the small-section dark-digging tunnel step method excavation trolley according to claim 1 is characterized in that: The double-jointed I-beam cross beam is connected and fixed to the pillar through a detachable plug-in structure via a cross beam triangular plate and a high-strength pin shaft respectively arranged on the inner side of the pillar.

4. The lifting and installation structure of the small-section dark-digging tunnel step method excavation trolley according to claim 3 is characterized in that: The crossbeam triangle plate is arranged as an upper and lower combined structure on the inner side of each pillar. The double-piece I-beam crossbeam is located between the upper and lower triangle plates and is connected and fixed by a high-strength pin shaft passing through the upper and lower triangle plates and the double-piece I-beam crossbeam.

5. The lifting and installation structure of the small-section dark-digging tunnel step method excavation trolley according to claim 3 is characterized in that: The pillars of the step method excavation trolley are fixed to the U-shaped groove formed by the vertical supporting steel and the horizontal connecting steel on the supporting steel frame of the fixed support platform.

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