Movable construction platform applied to shield tunnel arc surface

Abstract

The utility model belongs to tunnel construction technical field, concretely relates to a kind of movable construction platform applied to shield tunnel arc surface.The platform includes bearing table, bearing frame, three groups of support wheel group and distance adjusting mechanism, bearing frame is fixedly connected with bearing table, three groups of support wheel group are respectively arranged in bearing frame lower side and left and right sides, corresponding butt shield tunnel arc side bottom, tunnel arc side and box culvert side.Distance adjusting mechanism uses scissor type telescopic structure, cooperates the screw rod of opposite thread at two ends, can accurately adjust the interval of corresponding support wheel group and bearing frame, realize the close adaptation with different size tunnel.Bearing table extension design can avoid gap safety hazard, and bearing frame is provided with reinforcing piece to improve structural strength.The utility model is reasonable in structure, mobile flexible, positioning stable, can adapt to shield tunnel arc surface special operating environment, simplify operation process, improve construction safety and efficiency, satisfy tunnel construction actual demand.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, specifically relating to a movable construction platform applied to the arc surface of a shield tunnel. Background Technology

[0002] Currently, my country's subway construction is entering a period of rapid development, and shield tunneling technology has been widely applied in subway construction. Shield tunnels have a circular cross-section. The lower structure of the shield tunnel adopts a precast box culvert + cast-in-place reinforced concrete backfill structure. The upper part uses a 30cm composite secondary lining, with a central partition wall between the two tracks, a flue slab at the top, and an emergency evacuation platform in the middle of the partition wall. After the middle box culvert at the bottom of the tunnel is completed, the arc-shaped space formed between the sidewall of the box culvert and the inner wall of the tunnel is unique, causing great inconvenience to construction workers. Existing construction equipment suffers from insufficient stability, poor adjustment flexibility, and susceptibility to shaking, making it difficult to adapt to the construction requirements of the arc-shaped working surface. Therefore, there is an urgent need to design a precisely adaptable, stable, and reliable mobile construction platform to solve the problem of shield tunnel arc-shaped surface construction operations.

[0003] The methods described in this section are not necessarily methods that had been previously conceived or adopted. Unless otherwise specified, no method described in this section should be assumed to be prior art simply because it is included in this section. Similarly, unless otherwise specified, the issues mentioned in this section should not be considered to be accepted in any prior art. Utility Model Content

[0004] The purpose of this invention is to address the special working environment of the arc surface of shield tunnels, and to solve the problems of weak adaptability of existing construction equipment to tunnels of different sizes and insufficient operational stability. It provides a mobile construction platform with a reasonable structure and flexible movement. By precisely adjusting the support spacing, it can achieve a close fit with the inner wall of the tunnel and the box culvert, enhance the structural strength and positioning stability, reduce operational safety risks, and meet the actual construction needs of shield tunnel arc surface operations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A movable construction platform for use on the arc surface of a shield tunnel, comprising: Support platform; A support frame is connected to the support platform, and has a first support wheel set on its lower side, and a second support wheel set and a third support wheel set on its left and right sides, respectively. A distance adjustment mechanism is provided between the second support wheel assembly and the bearing frame to adjust the distance between the two.

[0006] Furthermore, the distance adjustment mechanism is configured as a scissor-type telescopic structure.

[0007] Furthermore, the distance adjustment mechanism includes: The first structure is fixedly connected to the support frame or is part of the support frame; The second structure is used to support and fix the second support wheel assembly; The linkage assembly includes a first link and a second link that are respectively hinged to the first structure and the second structure; The connecting seat is provided in two, and each connecting seat is hinged to at least one of the first and second links of the link assembly; The lead screw has threaded sections with opposite threads at both ends, and the two connecting seats are respectively threadedly connected to the two threaded sections.

[0008] Furthermore, the linkage group has N members, and the number N is greater than or equal to 2.

[0009] Furthermore, each of the connecting seats is connected to a linkage group on its upper and lower sides, and at least two linkage groups are connected on each side.

[0010] Furthermore, the support frame includes: A vertical support member, the upper side of which is fixedly connected to the bearing platform, the lower side of which is fixedly connected to the first support wheel group, and the right side of which is fixedly connected to the third support wheel group; An inclined support member is fixed to the bearing platform on its upper side and spaced to the left of the vertical support member. It is inclined from right to left from top to bottom, and its left side is connected to the distance adjustment mechanism.

[0011] Furthermore, the inclined support has a first reinforcing member above it that is connected to the support platform.

[0012] Furthermore, a second reinforcing member is provided between the inclined support member, the bearing platform, and the inclined support member.

[0013] Furthermore, the third support wheel set is provided in two sets, and the two sets of the third support wheel sets are longitudinally spaced apart.

[0014] Furthermore, the left end of the support platform extends to the left side above the second support wheel assembly, and the right end extends to the right side above the third support wheel assembly.

[0015] This utility model has at least the following beneficial effects: With strong adaptability, it can accurately match the arc surface of shield tunnels of different sizes. Through the cooperation of scissor-type telescopic structure and bidirectional threaded screw, the distance between the support wheel group and the bearing frame can be flexibly adjusted, so that the platform can be tightly abutted against the inner wall of the tunnel and the side of the box culvert. It can effectively adapt to the special working environment of the arc surface of shield tunnels, without the need to customize equipment separately for different tunnel sizes.

[0016] With high structural stability, the support frame adopts a collaborative design of vertical and diagonal support components, combined with multiple reinforcements to form a stable support system. With the multi-point contact and three-point support layout of multiple sets of support wheels, the overall strength and load-bearing capacity of the platform are greatly improved. It can effectively resist concentrated loads during construction, avoid swaying during operation, and provide a safe and reliable working foundation for construction personnel.

[0017] With excellent operational safety, the extended design of the support platform avoids large gaps between it and tunnels and box culverts, reducing the risk of objects falling and personnel accidentally stepping on them. The sides can also be equipped with fencing for further protection as needed. At the same time, the platform is positioned as a whole through a dedicated fixing device, eliminating the need to operate the brakes of each support wheel group individually. This simplifies the operation process and ensures the stability after positioning, providing comprehensive protection for construction safety. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram illustrating the usage state of a movable construction platform of the present invention applied to the arc surface of a shield tunnel; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 for Figure 2 Enlarged structural diagram at point B; Figure 4 This is a structural schematic diagram of an embodiment of the movable construction platform of this utility model applied to the arc surface of a shield tunnel; Figure 5 for Figure 4 A magnified schematic diagram of the structure at point C.

[0019] The meanings of the labels in the attached diagram are as follows: 1. Support platform, 2. Support frame, 21. Vertical support, 22. Inclined support, 23. First reinforcing member, 24. Second reinforcing member, 3. First support wheel assembly, 4. Second support wheel assembly, 5. Third support wheel assembly, 6. Distance adjustment mechanism, 61. Second structure, 62. Linkage assembly, 621. First link, 622. Second link, 63. Connecting seat, 64. Lead screw, 641. Threaded section, 7. Shield tunnel, 8. Box culvert. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Reference Figures 1-5As shown, the movable construction platform for the arc surface of a shield tunnel provided in this embodiment includes a support platform 1, a support frame 2, a first support wheel group 3, a second support wheel group 4, a third support wheel group 5, and a distance adjustment mechanism 6. These components work together to achieve stable operation and flexible movement. The support platform 1 serves as the working platform for construction personnel. Its main body is flat, with its left end extending to the upper left side of the second support wheel group 4 and its right end extending to the upper right side of the third support wheel group 5. This extended design effectively avoids large gaps between the support platform 1 and the arc surface of the shield tunnel 7, and between the support frame 2 and the side of the box culvert 8. This reduces the probability of items falling into the gaps during construction and prevents workers from accidentally stepping into them, providing protection. In other embodiments, barriers can be installed on the sides of the support platform 1 according to actual operational needs to further enhance operational safety.

[0022] The support frame 2 is the core support of the entire platform and is fixedly connected to the support platform 1. It includes a vertical support member 21 and an inclined support member 22. The upper side of the vertical support member 21 is connected to the support platform 1, the lower side is connected to the first support wheel group 3, and the right side is fixed to the third support wheel group 5. It can stably bear the weight of each component and transmit the force. The upper side of the inclined support member 22 is also fixed to the support platform 1 and is distributed at intervals on the left side of the vertical support member 21. Its whole body is inclined. The left side is connected to the distance adjustment mechanism 6. This inclined design can make the force on the support frame 2 more balanced and improve the overall structural stability. To further enhance the strength of the support frame 2, a first reinforcing member 23 is provided above the inclined support member 22. In this embodiment, the first reinforcing member 23 is parallel to the vertical support member 21 and is adapted to the front and rear width of the inclined support member 22, which can strengthen the connection strength between the inclined support member 22 and the support platform 1. At the same time, a second reinforcing member 24 is provided between the inclined support member 22, the support platform 1 and the vertical support member 21. In this embodiment, the second reinforcing member 24 is a plate-shaped structure perpendicular to the above three members, and multiple members are provided and spaced apart. The overall stability of the support frame 2 is further improved by strengthening at multiple points. In other embodiments, the shape and distribution of the first reinforcing member 23 and the second reinforcing member 24 can be adjusted according to the specific structure of the support frame 2.

[0023] The first support wheel set 3 is located on the lower side of the support frame 2. During operation, it directly abuts against the bottom surface of the arc side of the shield tunnel, providing bottom support for the platform and ensuring the overall load-bearing foundation of the platform. The second support wheel set 4 is located on the left side of the support frame 2 and is connected to the support frame 2 through the distance adjustment mechanism 6. During operation, it abuts against the side of the arc side of the shield tunnel and forms a lateral limit with other support wheel sets. The third support wheel set 5 is installed on the right side of the support frame 2 and is used to abut against the side of the box culvert 8. In this embodiment, the third support wheel set 5 is set in two sets and longitudinally spaced. By increasing the contact points with the box culvert 8, the abutment stability between the platform and the box culvert 8 is effectively improved.

[0024] The distance adjustment mechanism 6 is crucial for adapting the platform to different tunnel sizes. It employs a scissor-type telescopic structure, including a first structure, a second structure 61, a linkage group 62, a connecting seat 63, and a lead screw 64. The first structure is fixedly connected to the support frame 2; in this embodiment, it directly serves as part of the support frame 2, providing a stable fixed reference for the adjustment mechanism. The second structure 61 is specifically designed to support and fix the second support wheel group 4, acting as an intermediate carrier connecting the distance adjustment mechanism 6 and the second support wheel group 4. The linkage group 62 consists of a first connecting rod 621 and a second connecting rod 622, both hinged to the first and second structures 61 respectively, forming the core skeleton of the scissor-type telescopic mechanism. In this embodiment, there are at least two linkage groups 62. The coordination of multiple linkage groups 62 ensures the smoothness of the telescopic adjustment process and guarantees the structural strength of the entire distance adjustment mechanism 6. In other embodiments, the number of linkage groups 62 can be appropriately increased or decreased according to load-bearing requirements. The connecting seat... There are two connecting seats 63. Each connecting seat 63 is hinged to at least one first link 621 and a second link 622 of a set of connecting rods 62. In this embodiment, each connecting seat 63 is connected to a set of connecting rods 62 on both the upper and lower sides, and the number of connecting rods 62 connected on each side is not less than two. This design can improve the structural strength of the adjustment mechanism and ensure that multiple sets of connecting rods 62 extend and retract synchronously. The two ends of the lead screw 64 are provided with threaded sections 641 with opposite thread directions. The two connecting seats 63 are threadedly connected to these two threaded sections 641 respectively. When the lead screw 64 is rotated, the two connecting seats 63 will move closer or further away from each other by means of the transmission action of the opposite threads, thereby driving the connecting rods 62 to extend or retract, and finally realizing the precise adjustment of the distance between the second support wheel set 4 and the bearing frame 2.

[0025] In practical use, the mobile construction platform is first transported to the target work area inside the shield tunnel, with the first support wheel set 3 aligned with the bottom surface of the shield tunnel's arc side, and the third support wheel set 5 aligned with the side of the box culvert 8. Simultaneously, the second support wheel set 4 is aligned with the preset contact position on the arc side of the shield tunnel. Then, the lead screw 64 is rotated. Under the action of the opposite threads at both ends of the lead screw 64, the two connecting seats 63 move synchronously, causing the connecting rod assembly 62 to unfold, pushing the second structure 61 and the second support wheel set 4 closer to the arc side of the shield tunnel until the second support wheel set 4 is in tight contact with the arc side of the tunnel. At this point, the platform forms a three-point stable support through the first support wheel set 3, the second support wheel set 4, and the third support wheel set 5, effectively preventing swaying during operation, thus completing the platform's fixation. Construction personnel stand on the support platform 1 to carry out relevant construction work. The extended structure of the support platform 1 and any possible barriers work together to ensure operational safety. When the working position needs to be adjusted, rotate the lead screw 64 in the opposite direction to retract the connecting rod group 62, and separate the second support wheel group 4 from the arc side of the shield tunnel, releasing the tight contact state. Then push the platform and move it to the new working position in the tunnel by means of the rolling characteristics of each support wheel group. After repeating the above adjustment and fixing steps, construction can be carried out again.

[0026] In this embodiment, to facilitate the operation of the lead screw 64 for spacing adjustment by construction personnel, a handle can be provided at the end of the lead screw 64. The shape of the handle can be designed according to the grip comfort, allowing the lead screw 64 to be rotated without additional tools, further improving the convenience of adjustment operation. Regarding the selection of wheels for each support wheel assembly, wheels with braking function can be used in other embodiments, but wheels without brakes are preferred. In this case, the platform can be positioned and fixed by an additional fixing device (not shown in the figure), which can form a stable connection with the tunnel inner wall or the side of the box culvert. This design avoids the cumbersome steps of individually braking each wheel during operation, reducing the operation process, while ensuring the stability of the platform after positioning and ensuring construction safety.

[0027] The core design principle of the aforementioned fixing device is that it eliminates the need to individually operate the braking function of each support wheel assembly. The platform is positioned by forming a stable connection with the inner wall of the shield tunnel or box culvert. Several feasible implementation methods are introduced below.

[0028] The first method is a clamping and limiting mechanism. It utilizes the clamping force generated by a mechanical structure to create a tight fit between the fixing device and the tunnel wall or box culvert side. The friction between the contact surfaces counteracts any potential displacement of the platform, thus achieving positioning. This method is suitable for scenarios with flat tunnel walls or box culvert sides. Operation requires only simple mechanical transmission to apply clamping force, without relying on additional pre-set structures, making it highly versatile.

[0029] The second method is snap-fit ​​positioning. This method utilizes existing protruding structures within the tunnel, pre-drilled slots, or pre-installed positioning components during construction to create a snap-fit ​​connection between the fixing device and these structures, mechanically preventing platform movement. The core of this method is achieving positioning through the snap-fit ​​relationship between structures. It is suitable for tunnels with pre-installed positioning structures, offers strong stability after snap-fit, and requires no continuous external force.

[0030] The third method is tension fastening, which connects the platform to fixed anchor points (such as pre-embedded anchor bolts or stable structural components) within the tunnel using tension components. The tension restricts the platform's movement, thus achieving positioning. This method is suitable for scenarios where fixed anchor points are available within the tunnel. The fixing force can be adjusted according to the tension, making it suitable for construction scenarios requiring high positioning stability.

[0031] All of the above methods can achieve platform positioning without the need for separate operation of the support wheel assembly brake. In practical applications, the appropriate method can be selected based on factors such as tunnel structure, inner wall material, and construction requirements. The core of all methods is to achieve positioning through the direct interaction between the fixing device and the tunnel or box culvert, simplifying the operation process while ensuring operational safety.

[0032] In summary, this utility model, through its rational structural design and the cooperation of the scissor-type telescopic structure of the distance adjustment mechanism and the bidirectional threaded screw, can precisely adapt to the arc surface of shield tunnels of different sizes, ensuring a tight fit between the platform and the inner wall of the tunnel and the side of the box culvert, significantly improving the stability of the operation process. The multi-component collaborative design and reinforced structure of the support frame further enhance the overall strength and load-bearing capacity of the platform, providing a safe and reliable working foundation for construction personnel. The extended design of the support platform and the optional enclosure structure specifically address the safety hazards caused by gaps, improving operational safety. At the same time, the assembly, adjustment, and movement of the entire platform are simple and convenient, enabling it to quickly adapt to the special working environment of the arc surface of shield tunnels, effectively improving construction efficiency and meeting the actual needs of tunnel construction.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0034] Furthermore, the terms "first" and "second" 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A movable construction platform for use on the arc surface of a shield tunnel, characterized in that, include: Support platform; A support frame is connected to the support platform, and has a first support wheel set on its lower side, and a second support wheel set and a third support wheel set on its left and right sides, respectively. A distance adjustment mechanism is provided between the second support wheel assembly and the bearing frame to adjust the distance between the two.

2. The movable construction platform applied to the arc surface of a shield tunnel according to claim 1, characterized in that: The distance adjustment mechanism is configured as a scissor-type telescopic structure.

3. The movable construction platform applied to the arc surface of a shield tunnel according to claim 1, characterized in that: The distance adjustment mechanism includes: The first structure is fixedly connected to the support frame or is part of the support frame; The second structure is used to support and fix the second support wheel assembly; The linkage assembly includes a first link and a second link that are respectively hinged to the first structure and the second structure; The connecting seat is provided in two, and each connecting seat is hinged to at least one of the first and second links of the link assembly; The lead screw has threaded sections with opposite threads at both ends, and the two connecting seats are respectively threadedly connected to the two threaded sections.

4. The movable construction platform applied to the arc surface of a shield tunnel according to claim 3, characterized in that: The linkage group has N members, and the number N is greater than or equal to 2.

5. The movable construction platform applied to the arc surface of a shield tunnel according to claim 3 or 4, characterized in that: Each of the connecting seats is connected to a linkage group on its upper and lower sides, and at least two linkage groups are connected on each side.

6. The movable construction platform applied to the arc surface of a shield tunnel according to claim 1, characterized in that: The support frame includes: A vertical support member, the upper side of which is fixedly connected to the bearing platform, the lower side of which is fixedly connected to the first support wheel group, and the right side of which is fixedly connected to the third support wheel group; An inclined support member is fixed to the bearing platform on its upper side and spaced to the left of the vertical support member. It is inclined from right to left from top to bottom, and its left side is connected to the distance adjustment mechanism.

7. The movable construction platform applied to the arc surface of a shield tunnel according to claim 6, characterized in that: The inclined support has a first reinforcing member above it that is connected to the support platform.

8. The movable construction platform applied to the arc surface of a shield tunnel according to claim 6, characterized in that: The inclined support, the bearing platform, and the inclined support are connected by a second reinforcing member.

9. The movable construction platform applied to the arc surface of a shield tunnel according to claim 1, characterized in that: The third support wheel set is provided in two sets, and the two sets of the third support wheel set are longitudinally spaced apart.

10. The movable construction platform applied to the arc surface of a shield tunnel according to claim 1, characterized in that: The left end of the support platform extends to the left side above the second support wheel group, and the right end extends to the right side above the third support wheel group.

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