Movable hoisting platform for shield working well

Abstract

The utility model provides a movable hoisting platform for a shield working well, the movable hoisting platform comprises a movable platform and two walking tracks, the two walking tracks are symmetrically laid on a ring beam of the shield working well, and each walking track horizontally extends from the ring beam to a middle plate adjacent to the ring beam; the moving platform is a square platform, electric walking wheels are arranged on the front side of the moving platform, two sets of driven rolling wheels are arranged at the tail end of the moving platform, the two sets of driven rolling wheels of the moving platform are correspondingly arranged on the two rails and horizontally move on the rails, and the electric walking wheels move on the middle plate; the other three edges of the movable platform except one edge adjacent to the middle plate are all provided with protective fences, and a lifting frame is arranged in the middle of the movable platform. The safety risk of hoisting and transferring materials is reduced, the construction efficiency is improved, the problem of space limitation of hoisting a wellhead is solved, the space utilization rate and the hoisting efficiency of hoisting the wellhead are improved, and the number of auxiliary hoisting personnel is reduced.

Description

Technical Field

[0001] The utility model relates to a shield construction device, in particular to a movable hoisting platform for a shield working pit. Background Art

[0002] Shield tunneling is a relatively common method of subway construction. During the shield construction process, shield materials, slag, etc. are hoisted and transported through hoisting shafts. The hoisting shafts serve as the entry and exit channels for later operations. The size of the shaft mouth is constrained by many conditions, and the effective space is limited during hoisting. Hoisting operations are prone to blind spots in vision, and hoisting operations require frequent removal of shaft mouth guardrails. At least 1-2 people are required to assist in the hoisting process, and the operation efficiency is low. During the operation, factors such as blind spots in vision, crooked lifting, cross-operation, and three violations may lead to the superposition of safety risks such as lifting injuries, object strikes, and people falling from heights.

[0003] In addition, shield construction in busy areas generally has the characteristics of small site and inability to store materials in an orderly manner. Therefore, it is necessary to make full use of the middle plate and bottom plate area to effectively improve the site utilization rate. Moreover, during the shield construction process, there will be a large number of construction turnover and consumable materials. Materials are often delivered in large quantities, and some materials cannot be stored in the sun or rain, and have high storage requirements. Therefore, they need to be stored in suitable locations such as the station middle plate and bottom plate. There are lifting risks when shield materials are hoisted from the wellhead to the middle plate and bottom plate.

[0004] In summary, developing a mobile lifting platform suitable for hoisting wellheads can effectively avoid the above-mentioned safety risks and is of great significance to improving work efficiency. Summary of the invention

[0005] The utility model provides a movable lifting platform for a shield working shaft in view of the deficiencies in the prior art. The lifting platform moves on the ring beam in the wellhead area of ​​the shield working shaft through a track, and the materials lifted in through the lifting shaft can be directly lifted onto the platform and transferred to the middle plate through the mobile platform, thereby avoiding the lifting risks existing in direct lifting to the middle plate and reducing the difficulty of material transportation.

[0006] In order to achieve the above-mentioned technical objectives, the utility model provides a movable lifting platform for a shield working shaft, the movable lifting platform comprising a mobile platform and two walking tracks, the two walking tracks are symmetrically laid on the ring beam of the shield working shaft, and each walking track extends horizontally from the ring beam to the middle plate adjacent to the ring beam; the mobile platform is a square platform, the front side of which is provided with electric walking wheels, the rear end is provided with two groups of driven rollers, and the two groups of driven rollers of the mobile platform are correspondingly placed on two tracks and move horizontally on the tracks, and the electric walking wheels move on the middle plate; the mobile platform is provided with protective fences on the other three sides except for one side adjacent to the middle plate, and a lifting frame is provided in the middle of the mobile platform.

[0007] A further technical solution of the utility model is as follows: the driven rollers of the mobile platform can move on other flat grounds except the track; in the absence of the track, the driven rollers and the electric running wheels of the mobile platform move on a plane mid-plate or bottom plate.

[0008] The better technical solution of the utility model is as follows: the electric walking wheel comprises a driving motor, a connecting shaft, a main driving universal wheel and a driven universal wheel, the output shaft of the driving motor is connected to the rotating shaft of the main driving universal wheel through a transmission belt; the main driving universal wheel and the driven universal wheel are symmetrically arranged on both sides of the connecting shaft, a steering wheel is provided on the mobile platform, the steering wheel is connected to the connecting shaft through a gear transmission mechanism, racks are provided at both ends of the connecting shaft, a first transmission gear is installed on the universal rotating shafts of the main driving universal wheel and the driven universal wheel, the racks at both ends of the connecting shaft are respectively meshed with the first transmission gears on the main driving universal wheel and the driven universal wheel, and the universal shafts of the two universal wheels are driven to rotate simultaneously through the steering wheel, the transmission mechanism and the connecting shaft to achieve steering.

[0009] The better technical solution of the utility model is as follows: the walking track is in the form of a channel steel with an opening facing upward, and the walking surface of the track is on the same plane as the middle plate; more than 2 / 3 of the length of each walking track is laid on the ring beam, and the laying length of the walking track on the ring beam is 1 / 3 to 1 / 2 of the length of the ring beam; limit baffles are provided at the ends of the parts where the two walking tracks are placed on the ring beam.

[0010] A better technical solution of the utility model: the hanging frame comprises a supporting column and a crossbeam rotatably installed on the top of the supporting column, a hook is provided on one side of the crossbeam, and a counterweight is provided on the other end.

[0011] A more optimal technical solution of the utility model is as follows: a reflective warning strip, a warning light or an audible and visual alarm is arranged on the protective fence.

[0012] The better technical solution of the utility model is as follows: the transmission mechanism includes a second transmission gear installed on the rotating shaft of the steering wheel, the second transmission gear has the same tooth pitch as the first transmission gear, and the second transmission gear is meshed with a rack on one side of the linkage shaft adjacent to the main driving universal wheel, and limit blocks are provided on both sides of the racks at both ends of the linkage shaft.

[0013] The preferred technical solution of the utility model is as follows: the electric walking wheel is provided with an electromagnetic brake system; the main driving universal wheel, the driven universal wheel and the two groups of driven rollers are all provided with pressure sensors.

[0014] The preferred technical solution of the utility model is as follows: a driving position is arranged on the mobile platform at a position corresponding to the steering wheel.

[0015] A more preferred technical solution of the utility model is that the wheelbases of the main driving universal wheel and the driven universal wheel are smaller than the wheelbases of the two sets of driven rollers.

[0016] Beneficial effects of the utility model:

[0017] (1) The track of the utility model is partially laid on the ring beam of the wellhead area of ​​the middle plate, and partially laid on the middle plate. The mobile platform moves directly on the track, and the materials can be directly lifted onto the platform through the lifting wellhead, and then transferred to the designated material storage area of ​​the middle plate through the platform, which reduces the risks and difficulties of directly lifting materials to the middle plate through the lifting well, prevents the auxiliary lifting personnel from being dragged by the lifting objects or hit by falling objects when lifting materials, eliminates the blind spots of the lifting vision, and reduces the risks of lifting injuries, object strikes and high falls; and the mobile platform can also move on the bottom plate to transport materials.

[0018] (2) The mobile platform of the utility model is driven by an electric motor and can move back and forth freely, thus reducing the workload and the labor of manually pushing and transporting materials. The mobile platform is also equipped with a manual or electric brake, which can be directly locked after parking, ensuring smooth and safe operation for personnel. The walking wheels can also utilize the over-worn hob shaft of the shield machine, thus making good use of waste.

[0019] (3) The mobile platform of the utility model is also provided with a lifting frame, which can quickly transfer the materials on the platform to the middle plate or the bottom plate, thereby reducing the difficulty of manual transfer and storage and improving the efficiency of material transfer.

[0020] The utility model reduces the safety risk of material hoisting and transportation, improves construction efficiency, solves the problem of space limitation of the hoisting wellhead, improves the space utilization rate and hoisting efficiency of the hoisting wellhead, and reduces the number of auxiliary hoisting personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a top view of the utility model;

[0023] Figure 3 is a front view of the practical mobile platform;

[0024] Figure 4 This is a bottom view of the mobile platform of the utility model;

[0025] Figure 5 It is a schematic diagram of the transmission mechanism of the utility model;

[0026] Figure 6 It is a reference diagram of the use status of the utility model.

[0027] In the figure: 1—mobile platform, 2—travel track, 3—middle plate, 4—electric travel wheel, 400—drive motor, 401—main drive universal wheel, 402—driven universal wheel, 403—connecting shaft, 404—rack, 405—first transmission gear, 406—second transmission gear, 5—ring beam, 6—protective fence, 7—lifting frame, 700—support column, 701—cross beam, 702—counterweight, 703—hook, 8—driven roller, 9—steering wheel, 10—limit baffle, 11—shield working shaft, 12—driving position, 13—bottom plate. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Figures 1 to 6 The drawings are all of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the utility model. The following technical solutions shown in the drawings are specific solutions of the embodiments of the utility model and are not intended to limit the scope of the utility model to be protected. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] The embodiment provides a movable hoisting platform for a shield working pit, such as Figures 1 to 5As shown, the movable lifting platform includes a mobile platform 1 and two walking tracks 2, the two walking tracks 2 are symmetrically laid on the ring beam 5 of the shield working shaft 11, and each walking track 2 extends horizontally from the ring beam 5 to the middle plate 3 adjacent to the ring beam 5; the mobile platform 1 is a square platform, the front side of which is provided with electric walking wheels 4, and the tail end is provided with two groups of driven rollers 8, and the two groups of driven rollers 8 of the mobile platform 1 are correspondingly placed on the two tracks 2, and move horizontally on the tracks 2, and the electric walking wheels 4 move on the middle plate 3; the mobile platform 1 is provided with protective fences 6 on the other three sides except for one side adjacent to the middle plate 3, and the protective fences 6 are provided with warning devices such as reflective warning strips, warning lights or sound and light alarms to serve as warning reminders. A hoisting frame 7 is provided in the middle of the mobile platform 1, and the hoisting frame 7 includes a supporting column 700 and a beam 701 rotatably installed on the top of the supporting column 700. A hook 703 is provided on one side of the beam 701, and a counterweight 702 is provided on the other end. A manual or electric hoist can be installed on the hoisting frame to transfer the materials on the mobile platform 1 to the middle plate or the bottom plate. More than 2 / 3 of the length of each walking track 2 is laid on the ring beam 5, and the laying length of the walking track 2 on the ring beam 5 is 1 / 3 / ~1 / 2 of the length of the ring beam. A limit baffle 10 is provided at the end of the part where the two walking tracks 2 are placed on the ring beam 5. The walking track 2 is in the form of a channel steel with an opening facing upward, and its track running surface is on the same plane as the middle plate 3. There is no height difference between the walking track 2 and the plate surface of the middle plate 3, and it can directly transition from the walking track 2 to the middle plate 3. The driven roller 8 of the mobile platform 1 in the embodiment can move on other flat ground except the walking track 2; in the absence of the track, the driven roller 8 and the electric walking wheel 4 of the mobile platform 1 move on the plane middle plate 3 or the bottom plate 13; generally, when moving on the bottom plate 13, there is no need to set the walking track 2, and the material can be transferred directly on the bottom plate.

[0031] A movable hoisting platform for a shield working pit in an embodiment, such as Figures 1 to 5As shown, the electric walking wheel 4 includes a driving motor 400, a connecting shaft 403, a main driving universal wheel 401 and a driven universal wheel 402. The output shaft of the driving motor 400 is connected to the rotating shaft of the main driving universal wheel 401 through a transmission belt; the main driving universal wheel 401 and the driven universal wheel 402 are symmetrically arranged on both sides of the connecting shaft 403, a steering wheel 9 is provided on the mobile platform 1, and a driving seat 12 is provided at a position corresponding to the steering wheel 9 on the mobile platform 1, which can facilitate the staff sitting on the driving seat 12 to operate the steering wheel 9 and thus control the steering of the mobile platform 1. A control box and a control panel can also be provided on the driving seat 12 to realize the control of the entire mobile platform. Racks 404 are provided at both ends of the linkage shaft 403, and first transmission gears 405 are installed on the universal rotating shafts of the main driving universal wheel 401 and the driven universal wheel 402. The racks 404 at both ends of the linkage shaft 403 are respectively meshed with the first transmission gears 405 on the main driving universal wheel 401 and the driven universal wheel 402. A second transmission gear 406 is provided on the rotating shaft of the steering wheel 9. The second transmission gear 406 has the same tooth pitch as the first transmission gear 405, and the second transmission gear 406 is meshed with the rack 404 on the side of the linkage shaft 403 adjacent to the main driving universal wheel 401. Limit blocks are provided on both sides of the racks 404 at both ends of the linkage shaft 403 to prevent the racks and gears from disengaging. The universal shafts of the two universal wheels are driven to rotate simultaneously by the steering wheel 9, the transmission mechanism and the linkage shaft 403 to achieve steering.

[0032] In the lifting platform of the embodiment, the electric travel wheel 4 is provided with an electromagnetic brake system, which can be directly locked after stopping, so that the personnel can work smoothly and safely. The main driving universal wheel 401, the driven universal wheel 402 and the two sets of driven rollers 8 are all provided with pressure sensors; they can automatically sense the bearing gravity of the mobile platform, and can alarm in the event of overweight to avoid safety accidents. The wheelbase of the main driving universal wheel 401 and the driven universal wheel 402 is smaller than the wheelbase of the two sets of driven rollers 8, and the driven rollers 8 are directional wheels, which can ensure that the universal wheels are not only in the track area.

[0033] The utility model was applied in a specific subway construction project, which is a subway construction project in Chengdu, in which a station is 336.47m long + the length of the open-cut wiring section is 53.14m, the total length of the line is 2703.417m, the total length of the left line of the shield section is 1987.87m, and the total length of the right line is 2158.49m. During the construction process, due to limited site space, subway construction is mostly in the bustling areas of the city. Shield construction generally has small sites and materials cannot be stored in an orderly manner. In addition, the material turnover frequency is high, and it is necessary to make full use of the middle plate and bottom plate areas for storing materials. However, the materials are directly hoisted to the middle plate through the shield shaft. Since the middle plate corresponding to the shield shaft area is hollow, it is necessary to use oblique lifting during the hoisting process, and there are great safety risks during the hoisting process. In order to solve the problem of material transportation, the project used the hoisting platform of this application. Specifically, Figure 6 As shown, firstly, the walking track 2 is laid in the area near the middle plate 3 of the shield shaft ring beam 5. The length of the walking track 2 on the ring beam 5 accounts for 1 / 3 to 1 / 2 of the length of the ring beam. The other end of the walking track 2 extends to the middle plate, and no baffle is set at one end of the middle plate, so that the mobile platform can continue to move directly on the middle plate 3 after leaving the track. The mobile platform adopts a second lining welded with a patterned steel plate to meet the hoisting strength. The width is determined according to the size of the wellhead ring beam, and the length is based on the material hoisting and gantry crane unloading operation area. It is recommended to take half the length of the hoisting wellhead (about 3m). The walking track adopts on-site 15mm channel steel, and the track spacing matches the wellhead size and the walking wheel spacing; the walking driven roller 8 adopts a steel wheel, a single pulley bears 1T, and the pulley load meets the safety factor requirements (conventional material weight <2T); the driven walking roller 8 can also use the shield excessively worn hob cutter shaft, waste utilization.

[0034] The inventor of this project also calculated and verified the bearing capacity of the lifting platform. The lifting platform is customized according to the size of the lifting wellhead. The conventional lifting wellhead is 9m*5m, and the designed lifting platform area is 3m*5m. The platform frame is welded with Q235B steel. Through force verification, the maximum bearing capacity of the platform is 30.75kN / ㎡. During the material transportation process, the platform only stores single materials. Conventional materials include: grease, slag improver, grouting materials, and other auxiliary materials. Among them: shield tail sealing grease is 0.25t / barrel, and the bottom cross-sectional area is 0.26㎡; hydraulic oil is 0.17t / barrel, and the bottom cross-sectional area is 0.26㎡; foaming agent is 1t / barrel, and the bottom cross-sectional area is 1㎡; water glass is 1.45t / barrel, and the bottom cross-sectional area is 1㎡; other dispersants (small barrels or bags) are all less than 1t. The steel platform structure was subjected to stress calculation based on the finite element analysis principle. The maximum stress generated by the heaviest single material carried by each 1㎡ platform (taking a single barrel of water glass of 1.5t as an example) is 3.075MPa, the yield strength of Q235B is 235MPa, the maximum displacement is 1.879mm, and the safety factor is 76.4, which meets the use requirements.

[0035] When the lifting platform in the embodiment is working, first move the mobile platform 1 to one end of the walking track 2 adjacent to the shield working shaft, then lift the material vertically onto the mobile platform, and then move the mobile platform along the walking track 2 to the middle plate 3. After completely leaving the walking track 2, it can continue to move along the middle plate 3 to the designated material stacking position, and then install a manual or electric hoist on the lifting bracket to lift the material to the designated position of the middle plate for storage. The whole process only requires 1-2 staff members to assist in the operation, and no manual handling is required. The lifting platform in the embodiment can also directly transfer materials on the bottom plate 13. The transfer method is the same as that of the middle plate 3, except that there is no need to set up a track.

[0036] The above is only one embodiment of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. A movable hoisting platform for a shield working pit, characterized in that: The movable hoisting platform comprises a movable platform (1) and two running tracks (2), wherein the two running tracks (2) are symmetrically laid on a ring beam (5) of a shield working shaft (11), and each running track (2) extends horizontally from the ring beam (5) to a middle plate (3) adjacent to the ring beam (5); the movable platform (1) is a square platform, and is provided with electric running wheels (4) at its front side and two sets of driven rollers (8) at its rear end, and the two sets of driven rollers (8) of the movable platform (1) are correspondingly placed on the two tracks (2) and move horizontally on the tracks (2), and the electric running wheels (4) move on the middle plate (3); the movable platform (1) is provided with protective fences (6) on the other three sides except for one side adjacent to the middle plate (3), and a hoisting frame (7) is provided in the middle of the movable platform (1).

2. A movable hoisting platform for a shield working pit according to claim 1, characterized in that: The driven rollers (8) of the mobile platform (1) can move on other flat ground except the running track (2); in the absence of the track, the driven rollers (8) and the electric running wheels (4) of the mobile platform (1) move on the plane mid-plate (3) or the bottom plate (13).

3. A movable hoisting platform for a shield working pit according to claim 1 or 2, characterized in that: The electric travel wheel (4) comprises a drive motor (400), a linkage shaft (403), a main drive universal wheel (401) and a driven universal wheel (402); the output shaft of the drive motor (400) is connected to the rotating shaft of the main drive universal wheel (401) via a transmission belt; the main drive universal wheel (401) and the driven universal wheel (402) are symmetrically arranged on both sides of the linkage shaft (403); a steering wheel (9) is provided on the mobile platform (1); the steering wheel (9) is connected to the linkage shaft (403) via a gear transmission mechanism. The linkage shaft (403) is connected in a transmission manner, with racks (404) being provided at both ends of the linkage shaft (403), and first transmission gears (405) being installed on the universal rotation shafts of the main driving universal wheel (401) and the driven universal wheel (402), and the racks (404) at both ends of the linkage shaft (403) are respectively meshed with the first transmission gears (405) on the main driving universal wheel (401) and the driven universal wheel (402), and the universal shafts of the two universal wheels are driven to rotate simultaneously through the steering wheel (9), the transmission mechanism and the linkage shaft (403) to achieve steering.

4. The movable hoisting platform for a shield working pit according to claim 1, characterized in that: The running track (2) is in the form of a channel steel with an opening facing upward, and its running surface is on the same plane as the middle plate (3); more than 2 / 3 of the length of each running track (2) is laid on the ring beam (5), and the laying length of the running track (2) on the ring beam (5) is 1 / 3 to 1 / 2 of the length of the ring beam; and a limit baffle (10) is provided at the ends of the parts where the two running tracks (2) are placed on the ring beam (5).

5. A movable hoisting platform for a shield working pit according to claim 1 or 2, characterized in that: The hanging frame (7) comprises a supporting column (700) and a crossbeam (701) rotatably mounted on the top of the supporting column (700); a hook (703) is provided on one side of the crossbeam (701) and a counterweight (702) is provided on the other end.

6. A movable hoisting platform for a shield working pit according to claim 1 or 2, characterized in that: The protective fence (6) is provided with a reflective warning strip, a warning light or an audible and visual alarm.

7. The movable hoisting platform for a shield working pit according to claim 3, characterized in that: The transmission mechanism comprises a second transmission gear (406) mounted on the rotating shaft of the steering wheel (9), the second transmission gear (406) having the same tooth pitch as the first transmission gear (405), and the second transmission gear (406) meshing with a rack (404) on one side of the linkage shaft (403) adjacent to the main driving universal wheel (401), and limit blocks are provided on both sides of the racks (404) at both ends of the linkage shaft (403).

8. The movable hoisting platform for a shield working pit according to claim 3, characterized in that: The electric travel wheel (4) is provided with an electromagnetic brake system; the main driving universal wheel (401), the driven universal wheel (402) and the two sets of driven rollers (8) are all provided with pressure sensors.

9. The movable hoisting platform for a shield working pit according to claim 3, characterized in that: A driving position (12) is provided on the mobile platform (1) at a position corresponding to the steering wheel (9).

10. The movable hoisting platform for a shield working pit according to claim 3, characterized in that: The wheelbases of the main driving universal wheel (401) and the driven universal wheel (402) are smaller than the wheelbases of the two sets of driven rollers (8).

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