Positioning device for embedded steel bars of bridge evacuation platform and construction method

Abstract

The application relates to a positioning device for embedded steel bars of a bridge evacuation platform and a construction method, and relates to the technical field of bridge engineering construction. The positioning device comprises at least one positioning assembly. Each positioning assembly comprises: at least one steel bar clamp provided with a cavity for accommodating and limiting the embedded steel bars; a supporting structure connected to the bottom or side of the steel bar clamp and used for supporting the steel bar clamp on the bridge; and a laser module arranged on the supporting structure or the steel bar clamp and used for emitting a laser beam to guide the steel bar clamp to be aligned with a reference line. The steel bar clamp, the supporting structure and the laser module are integrated into an independent positioning assembly, so that modular design is realized. The laser module is used for rapid centering instead of manual line pulling, so that the positioning accuracy and efficiency are greatly improved. The supporting structure is provided with a preset height for controlling the thickness of a protective layer. The application solves the problems of steel bar deviation, uneven spacing, and irregular line shape, and has the effects of accurate positioning, easy control of the thickness of the protective layer, high construction efficiency and low rework rate.

Description

Technical Field

[0001] This application relates to the field of bridge engineering construction technology, and in particular to a positioning device and construction method for pre-embedded steel bars in bridge evacuation platforms. Background Technology

[0002] As an important component of bridge ancillary structures, the positioning and binding of pre-embedded reinforcing steel bars in bridge evacuation platforms is a critical step in the construction process. In actual engineering projects, the pre-embedded reinforcing steel bars of evacuation platforms are usually arranged in multiple horizontal layers, with multiple layers of steel mesh set along the height of the bridge. Furthermore, a single bridge often has dozens or even hundreds of evacuation platforms spaced at intervals, distributed sequentially along the length of the bridge. Each evacuation platform requires independent positioning and binding of its pre-embedded reinforcing steel bars, resulting in a large workload and high precision requirements.

[0003] Currently, the construction of pre-embedded steel bars for bridge evacuation platforms generally adopts the traditional manual tying method. Construction workers determine the planar position and spacing of each steel bar individually according to the design drawings, using methods such as string lines and rulers, and then tie them in place one by one. However, this traditional manual construction method has certain shortcomings. First, the positioning accuracy relies entirely on the worker's experience and skill level. The string line and ruler measurement process is prone to cumulative errors, leading to problems such as steel bar misalignment, uneven spacing, excessive deviation in the spacing between multiple layers of steel bars, and overall uneven alignment. Second, the thickness of the protective layer is mainly controlled by manual visual inspection or simple spacers, making it difficult to guarantee compliance. Furthermore, the entire process requires repeated positioning and repetitive operations, which is extremely time-consuming and inefficient. More seriously, the pre-concrete pouring acceptance phase often reveals numerous defects, requiring rework and rectification, which not only wastes materials but also directly impacts the construction progress. Summary of the Invention

[0004] To address the problems of easy rebar displacement, uneven spacing, difficulty in controlling the protective layer thickness, low construction efficiency, and high rework rate associated with traditional manual tying methods, this application provides a positioning device and construction method for pre-embedded rebar in bridge evacuation platforms.

[0005] The technical solution provided in this application for a positioning device and construction method for pre-embedded reinforcing bars in bridge evacuation platforms is as follows: A positioning device for pre-embedded reinforcing bars in a bridge evacuation platform includes at least one positioning component; each positioning component includes: At least one rebar clamp, the rebar clamp having a cavity for accommodating and limiting the pre-embedded rebar; A support structure for installation on a bridge, the support structure being connected to the rebar clamp to support the rebar clamp on the bridge; A laser module, located on the supporting structure or the steel bar clamp, is used to emit a laser beam to guide the steel bar clamp to align with a preset baseline on the bridge.

[0006] By adopting the above technical solution, the rebar clamps, support structure, and laser module are integrated into an independent positioning component. Each positioning component can work independently, realizing the modular design of the device. The laser module can emit a laser beam to quickly align with the baseline on the bridge, replacing the traditional manual string line measurement method and greatly improving positioning accuracy and efficiency. The support structure presets the height of the rebar clamps relative to the beam surface, thereby controlling the protective layer thickness of the embedded rebars and solving the technical problems of rebar misalignment, uneven spacing, and excessive protective layer thickness in traditional construction.

[0007] In one specific implementation, the positioning component includes at least two of the steel bar clamps, which are arranged along the height direction of the bridge, and adjacent steel bar clamps are connected by a first connecting rod.

[0008] By adopting the above technical solution, when the evacuation platform needs to be equipped with multiple layers of pre-embedded steel bars along the height direction, multiple steel bar clamps are connected into one unit along the height direction of the bridge by the first connecting rod. Each steel bar clamp corresponds to one layer of steel bars, so that the positioning component can simultaneously cover multiple layers of steel bars distributed along the height direction, realizing multi-layer synchronous positioning in the vertical direction, effectively ensuring the layer spacing accuracy between each layer of steel bars and the overall stability of the steel mesh, and adapting to the construction requirements of the evacuation platform for multi-layer steel bar arrangement.

[0009] In one specific implementation, the positioning device includes at least two positioning components arranged along the length of the bridge, with adjacent positioning components connected by a second connecting rod.

[0010] By adopting the above technical solution, when a bridge is designed with multiple evacuation platforms arranged along its length, multiple positioning components are connected into an integral positioning frame by the second connecting rod. Each positioning component corresponds to one evacuation platform, realizing the synchronous positioning operation of multiple evacuation platforms. The overall frame has higher structural rigidity, and when the whole is lifted, each component moves synchronously, ensuring stability during the transfer process, while ensuring the consistency and straightness of the steel reinforcement lines of each evacuation platform.

[0011] In one specific implementation, the rebar clamp is provided with multiple slots, the slots are connected to the cavity, and the slots are corresponding to the pre-embedded rebars.

[0012] By adopting the above technical solution, each rebar clamp is equipped with multiple slots that communicate with the cavity. Each slot corresponds to a pre-embedded rebar, which allows multiple rebars in the same plane to be simultaneously clamped into the rebar clamp for synchronous positioning. The structure of the slots communicating with the cavity ensures that the rebars can be smoothly clamped in and reliably positioned, preventing the rebars from shifting during the positioning process and significantly improving the positioning efficiency of single-layer rebars.

[0013] In one specific implementation, the plurality of the slots are evenly distributed along the circumference of the rebar clamp.

[0014] By adopting the above technical solution, multiple slots are evenly distributed around the same rebar clamp, enabling the rebar clamp to simultaneously limit embedded rebars arranged from different directions in the same height plane, such as cross-shaped, ring-shaped, or radial rebars. The circumferentially distributed design ensures that the spacing of rebars in each direction within the same layer is consistent and evenly distributed, further improving the applicability of the positioning device to complex rebar layout scenarios.

[0015] In one specific implementation, the support structure is located on the side of the rebar clamp and includes a connecting part, a supporting part, and a fixing part. The connecting part is connected to the rebar clamp, the fixing part is installed on the bridge, and the supporting part connects the connecting part and the fixing part.

[0016] By adopting the above technical solution, the support structure adopts a three-section design of connection part, support part and fixing part. The connection part is connected to the steel bar clamp, the fixing part is in contact with the beam surface, and the support part is the middle force transmission component. This structure makes the support stable and reliable, and can stably support the steel bar clamp at a predetermined height above the beam surface.

[0017] In one specific implementation, the support portion is telescopically configured and includes a first support portion and a second support portion. The first support portion is sleeved on the outside of the second support portion. One end of the first support portion is connected to the fixing portion, and one end of the second support portion is connected to the connecting portion. The second support portion is slidably disposed inside the first support portion and its relative position is locked by a locking member.

[0018] By adopting the above technical solution, the support part adopts a telescopic structure with a sliding fit between the first support part and the second support part, so that the total height of the support part can be continuously adjusted as needed; when facing different design requirements for protective layer thickness, the same set of devices only needs to adjust the telescopic length to meet the requirements; when facing slightly uneven beam surfaces, the telescopic length of each support structure can be adjusted separately to ensure that all steel bar clamps are on the same horizontal plane, which greatly enhances the adaptability and versatility of the device.

[0019] In one specific implementation, the locking element includes a screw, the first support portion has a through hole, and the second support portion has a plurality of threaded holes along the height direction, the screw passing through the through hole and engaging with the threaded holes.

[0020] By adopting the above technical solution, the locking component uses a structure in which a screw passes through a through hole and engages with a threaded hole, thus achieving reliable locking after the height of the support part is adjusted; the through hole on the first support part engages with multiple threaded holes arranged along the height direction on the second support part to form a multi-level height adjustment mechanism, which is simple in structure, easy to operate, reliable in locking, and convenient for quick on-site adjustment.

[0021] In one specific implementation, the rebar clamp includes multiple detachably connected clamp segments, with adjacent clamp segments connected by tenon joints, bolts, or snap fasteners.

[0022] By adopting the above technical solution, the rebar clamp adopts a split structure with multiple clamp sections that can be detachably connected, which allows the rebar clamp to be flexibly combined according to the actual required length. When the groove on a certain clamp section is worn due to long-term use, only that clamp section needs to be replaced instead of the entire rebar clamp, reducing maintenance costs. At the same time, the split structure is also easy to store and transport, further improving the practicality of the device.

[0023] In a specific feasible implementation, the following steps are included: The construction baseline is laid out on the bridge beam surface; Place the positioning device on the area to be constructed on the beam surface, so that the support structure of the positioning component contacts the beam surface; Turn on the laser module on the positioning component and adjust the position of the positioning component so that the laser beam emitted by it is aligned with the construction baseline. While the positioning component is in its limited position, the pre-embedded steel bars of the evacuation platform are tied. After binding is completed, lift the positioning component upwards to disengage the cavity of the rebar clamp from the pre-embedded rebar that has been bound and fixed. Move the positioning device to the next construction area and repeat the above steps.

[0024] By adopting the above technical solutions, this construction method simplifies the complex work of positioning pre-embedded steel bars into a standardized process of "laying out lines, positioning, centering, binding, lifting, and moving." Laser centering replaces traditional manual line measurement, significantly improving positioning efficiency and accuracy. The lift-off design allows the device to quickly detach from the bound steel bars and move to the next work station, realizing continuous flow operation of pre-embedded steel bars for long-span bridge evacuation platforms. The entire method has low skill requirements for workers, is easy to operate, significantly improves construction efficiency and first-time acceptance rate, and reduces rework rate and labor costs.

[0025] In summary, the beneficial technical effects of this application are as follows: This application achieves a modular design of the device by integrating the rebar clamp, support structure, and laser module into an independent positioning component: each positioning component can work independently, the laser module can emit a laser beam to quickly align with the bridge baseline, replacing the traditional manual string line measurement, and greatly improving the positioning accuracy and efficiency; at the same time, the support structure presets the height of the rebar clamp relative to the beam surface, thereby controlling the thickness of the protective layer of the embedded rebar; Furthermore, by connecting multiple steel bar clamps along the height direction via the first connecting rod, multiple layers of horizontal steel bars can be positioned synchronously, ensuring the accuracy of the spacing between layers of steel bars and the overall stability of the steel mesh; by connecting multiple positioning components along the length direction via the second connecting rod, multiple evacuation platforms can be constructed simultaneously, the overall frame structure is stable, and the consistency and straightness of the steel bar lines of each evacuation platform are guaranteed. Overall, this device effectively solves the technical problems of rebar misalignment, uneven spacing, excessive protective layer thickness, non-straight alignment, low construction efficiency, and high rework rate in traditional construction, and significantly improves the construction quality and efficiency of pre-embedded rebar in bridge evacuation platforms. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the positioning device for the pre-embedded steel bars of the bridge evacuation platform in this application.

[0027] Figure 2 This is a structural diagram showing the first connecting rod and the steel bar clamp.

[0028] Figure 3 This is a structural diagram showing the second connecting rod and the positioning assembly.

[0029] Figure 4 It is a structural diagram showing the supporting structure.

[0030] Figure 5 This is a structural diagram illustrating a retractable support structure.

[0031] Figure 6 This is a structural diagram showing a detachable rebar clamp.

[0032] Explanation of reference numerals in the attached drawings: 1. Positioning component; 2. Rebar clamp; 21. Cavity; 22. Slot; 23. Clamp section; 3. Support structure; 31. Connecting part; 32. Supporting part; 321. First supporting part; 322. Second supporting part; 33. Fixing part; 4. Laser module; 5. First connecting rod; 6. Second connecting rod; 7. Locking element; 8. Embedded rebar. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0034] This application discloses a positioning device for pre-embedded steel bars in bridge evacuation platforms, which aims to solve the technical problems of easy steel bar displacement, uneven spacing, difficulty in controlling the thickness of the protective layer, non-straight lines, low construction efficiency and high rework rate in traditional manual tying methods.

[0035] Reference Figure 1 The positioning device for pre-embedded steel bars 8 in bridge evacuation platforms includes at least one positioning component 1, and each positioning component 1 includes: at least one steel bar clamp 2, a support structure 3, and a laser module 4.

[0036] The rebar clamp 2 is provided with a cavity 21 for accommodating and limiting the pre-embedded rebar 8. The cavity 21 can be a long groove opened on the body of the rebar clamp 2, or it can be a continuous space defined by multiple spaced slots 22. The shape and size of the cavity 21 match the pre-embedded rebar 8 to be constructed, so as to ensure that the rebar can be smoothly put in and reliably limited.

[0037] The support structure 3 can be connected to the bottom or side of the rebar clamp 2 to reliably support the entire positioning assembly 1 on the beam surface of the bridge. The height of the support structure 3 is preset according to the design requirements or designed to be adjustable to control the height of the rebar clamp 2 relative to the beam surface, thereby ensuring the protective layer thickness of the embedded rebar 8.

[0038] The laser module 4 is installed on the support structure 3 or the steel bar clamp 2. Its function is to emit a visible laser beam to provide the operator with a clear optical reference to guide the steel bar clamp 2 to align with the pre-laid construction reference line (such as the center line of the bridge deck) on the bridge.

[0039] In the specific processing, the rebar clamp 2 can be made of Q235 steel plate with a thickness of 5mm, and its length is determined according to the actual width of the evacuation platform, which can be selected between 300mm and 1500mm; the support structure 3 is also welded from Q235 steel plate.

[0040] In this embodiment, the laser module 4 is installed on the top of the support structure 3. The laser module 4 can be a commercially available linear laser module with a working voltage of 3V-5V, powered by a battery, and controlled to be turned on and off by a micro switch. In this embodiment, the laser module can be installed on the support structure 3 by an adjustable bracket with a damping shaft, so that the direction of the laser beam can be finely adjusted to adapt to the baseline position of different bridges.

[0041] In order to further improve the working efficiency of a single rebar clamp 2, the rebar clamp 2 of this application is provided with multiple slots 22. These slots 22 are connected to the aforementioned cavity 21. The size and position of each slot 22 correspond to a pre-embedded rebar 8 to be positioned.

[0042] Specifically, the rebar clamp 2 can be made from a long strip of steel plate. Multiple U-shaped or semi-circular openings are made at equal intervals along its inner edge according to the spacing of the pre-embedded rebars 8 in the design drawings. These openings are called clamping slots 22. Each clamping slot 22 is connected to the cavity 21 to form a channel for accommodating the rebar. The width of the clamping slot 22 is slightly larger than the diameter of the pre-embedded rebar 8 (for example, 2-4 mm larger) so that the rebar can be inserted smoothly without causing excessive shaking.

[0043] With the above structure, the rebar clamp 2 is provided with multiple slots 22 that communicate with the cavity 21. Each slot 22 corresponds to a pre-embedded rebar 8, so that multiple rebars can be simultaneously clamped into the same rebar clamp 2 to achieve synchronous positioning. The structure of the slots 22 communicating with the cavity 21 ensures that the rebars can be smoothly clamped in and reliably limited, avoiding lateral movement of the rebars during the positioning process, and significantly improving the working efficiency of a single rebar clamp 2 unit.

[0044] Furthermore, multiple slots 22 can be evenly distributed along the circumference of the rebar clamp 2, so that embedded rebars 8 extending from different directions (such as front, back, left, right or radial) can be simultaneously limited within the same height plane corresponding to the rebar clamp 2. This is particularly suitable for embedded rebars 8 that need to be arranged in a cross, ring or radial pattern in the same layer. The circumferentially distributed design ensures that the spacing of the rebars in each direction in the same layer is consistent and the distribution is uniform, further improving the applicability of the positioning device to complex rebar layout scenarios.

[0045] Reference Figure 2 In a specific embodiment, considering that the evacuation platform may be provided with multiple layers of horizontal pre-embedded steel bars 8 (e.g., first layer steel bars, second layer steel bars, and third layer steel bars) along the bridge height direction (i.e., the direction perpendicular to the beam surface), each layer of steel bars needs to be positioned independently, so multiple steel bar clamps 2 need to be set, each steel bar clamp 2 corresponding to one layer of steel bars.

[0046] For example, when the design of the evacuation platform requires two or three layers of horizontally embedded steel bars 8 to be arranged along the height direction, two or three steel bar clamps 2 need to be set along the height direction to position the steel bars in different height planes, so as to ensure the accuracy of the spacing between each layer of steel bars and the overall stability of the steel mesh.

[0047] To address this need, the positioning component 1 of this application may include at least two rebar clamps 2; these rebar clamps 2 are arranged along the height direction of the bridge (i.e., the direction perpendicular to the beam surface), and adjacent rebar clamps 2 are fixedly connected by a first connecting rod 5; the first connecting rod 5 may be made of angle steel (e.g., L40×40×4mm) or square steel pipe (e.g., 20×20×2mm), and its length is determined according to the design vertical spacing between adjacent rebar clamps 2.

[0048] In specific connection, welding can be used to fix the two ends of the first connecting rod 5 to the two adjacent steel bar clamps 2 above and below. The first connecting rod 5 extends in the vertical direction, connecting multiple steel bar clamps 2 in series to form a clamp group arranged in the height direction. Welded connection has the advantages of stable structure and no need for disassembly and maintenance, and is suitable for construction scenarios where the number and spacing of steel bar clamps 2 are fixed for a long time.

[0049] In another embodiment, to achieve rapid assembly and disassembly on site and facilitate transportation and storage, a bolt connection method can also be adopted. Specifically, connecting ear plates are pre-welded or pre-cut on the side or end of each rebar clamp 2, and bolt holes are provided on the ear plates. During assembly, the two ends of the first connecting rod 5 are aligned with the ear plates on the two adjacent rebar clamps 2, and then the bolts are inserted and the nuts are tightened to complete the connection. When disassembly is required, simply loosen the nuts. This bolt connection method allows for flexible adjustment of the number and spacing of the rebar clamps 2 according to different construction needs, and also facilitates storage and transportation after use.

[0050] In practical applications, when the evacuation platform needs to be equipped with multiple layers of horizontally embedded steel bars 8 along the height direction, construction personnel can select two, three or more steel bar clamps 2 according to the number of layers, and connect them in series along the height direction (i.e., vertical direction) of the bridge through the first connecting rod 5 to form a vertical multi-layer clamp group, so that each steel bar clamp 2 corresponds to one layer of steel bars, and limits the embedded steel bars 8 in different height planes respectively; multiple slots 22 can be set on each steel bar clamp 2, corresponding to multiple steel bars in the same layer respectively; in this way, one positioning component 1 can simultaneously position the steel bars of each layer, ensuring the accuracy of the layer spacing between steel bars and the overall stability of the steel mesh.

[0051] Reference Figure 3In a specific embodiment, considering that a bridge is usually designed with multiple evacuation platforms, which are arranged at intervals or continuously along the length of the bridge; for example, a long-span bridge may have an evacuation platform set at certain intervals, and there may be dozens of evacuation platforms to be constructed on the entire bridge; how to efficiently and accurately complete the positioning of the pre-embedded steel bars of all evacuation platforms is an important engineering problem.

[0052] To address this need, the positioning device of this application may include at least two positioning components 1; these positioning components 1 are arranged along the length of the bridge, each positioning component 1 corresponds to an evacuation platform, and adjacent positioning components 1 are fixedly connected by a second connecting rod 6; the second connecting rod 6 may also be made of angle steel or square steel pipe, and adjacent positioning components 1 are fixed together by bolt connection to form an integral positioning frame extending along the length of the bridge.

[0053] In the specific connection, connection points can be set on the steel clamps 2 or support structures 3 of each positioning component 1; for example, connecting ear plates can be set at both ends of each positioning component 1, and the two ends of the second connecting rod 6 can be aligned with the ear plates on the two adjacent positioning components 1 respectively, and then bolts can be inserted and nuts tightened; in this way, two, three or more positioning components 1 can be connected sequentially along the length of the bridge to form a long overall frame, with each positioning component 1 corresponding to an evacuation platform.

[0054] When a bridge is designed with multiple evacuation platforms arranged along the length of the bridge, multiple positioning components 1 are connected along the length of the bridge to form an integral positioning frame by the second connecting rod 6. This allows the entire device to simultaneously position the pre-embedded steel bars 8 on multiple evacuation platforms. The integral frame formed by the connection of multiple positioning components 1 has higher structural rigidity. When the whole is lifted, each component moves synchronously, ensuring the stability of the frame during the transfer process. At the same time, it realizes the synchronous construction of multiple evacuation platforms, greatly improving construction efficiency and ensuring the consistency and straightness of the steel bar lines of each evacuation platform.

[0055] Reference Figure 1 and Figure 4 In one specific embodiment, the support structure 3 is located on the side of the rebar clamp 2, and it comprises three parts: a connecting part 31, a supporting part 32, and a fixing part 33. The connecting part 31 and the fixing part 33 are arranged in parallel, the supporting part 32 is perpendicular to the connecting part 31 and the fixing part 33, and the connecting part 31 and the fixing part 33 are located on the same side of the supporting part 32. One end of the supporting part 32 is connected to the connecting part 31, and the other end of the supporting part 32 is connected to the fixing part 33. The fixing part 33 is located directly below the rebar clamp 2 and is used to support it on the bridge beam surface.

[0056] In this embodiment, the connecting part 31, the supporting part 32 and the fixing part 33 adopt an integral molding structure, which can be processed as a whole by bending or casting to ensure structural strength and processing accuracy.

[0057] In another embodiment, the connecting part 31, the supporting part 32 and the fixing part 33 may also adopt a split structure and be assembled by welding or bolting to facilitate the replacement of parts of different sizes according to actual needs.

[0058] Bolt holes can be provided on the connecting part 31 to facilitate connection with the steel bar clamp 2 by bolts, so as to realize the detachable connection between the support structure 3 and the steel bar clamp 2, and facilitate the replacement of support structures 3 of different heights or different forms.

[0059] The fixing part 33 is a component that directly contacts the bridge beam surface. Its bottom surface can be designed as a plane to increase the contact area with the beam surface and reduce pressure. Alternatively, rubber pads or anti-slip textures can be set on the bottom surface to increase friction and prevent the device from sliding during construction. It can also play a certain buffering role to avoid damage to the beam surface caused by rigid contact.

[0060] The support part 32 is connected between the connecting part 31 and the fixing part 33, serving as the main load-bearing and force-transmitting component. It can be a solid column or a hollow pipe. The entire support structure 3 can be welded or bent from a 5mm thick Q235 steel plate, stably supporting the steel bar clamp 2 at a preset height above the beam surface.

[0061] The support structure 3 adopts a three-section design consisting of a connecting part 31, a supporting part 32, and a fixing part 33. The connecting part 31 is connected to the steel bar clamp 2, the fixing part 33 is in contact with the beam surface, and the supporting part 32 serves as the middle force transmission component. This structure makes the support stable and reliable, and can stably support the steel bar clamp 2 at a predetermined height above the beam surface.

[0062] Reference Figure 5 In another embodiment, in order to accommodate different protective layer thicknesses or slightly uneven beam surfaces, the support portion 32 is designed as a telescopic structure; specifically, the support portion 32 includes a first support portion 321 and a second support portion 322.

[0063] The first support part 321 is processed into a hollow sleeve, and its lower end is fixedly connected to the fixing part 33 (it can be integrally formed or welded). The inner diameter of the first support part 321 is slightly larger than the outer diameter of the second support part 322. The second support part 322 is processed into a solid rod or a thinner sleeve, and its upper end is fixedly connected to the connecting part 31. The second support part 322 can be slidably inserted into the interior of the first support part 321. By adjusting the depth of the second support part 322 inserted into the first support part 321, the total height of the entire support part 32 can be changed. After adjustment, the relative position of the two is locked by a locking member 7.

[0064] In this embodiment, the locking element 7 is a screw. Specifically, one or two through holes are opened on the side wall of the first support part 321 (sleeve), and multiple threaded holes (e.g., M5 threaded holes) are opened on the second support part 322 (inner rod) along its height direction (i.e., axial direction). The spacing between adjacent threaded holes is 10mm or 20mm, forming a multi-position adjustment. When the second support part 322 slides to the predetermined position, it is rotated to adjust so that one of the threaded holes is aligned with the through hole on the first support part 321. Then, the screw is passed through the through hole and screwed into the threaded hole to securely lock the two together.

[0065] If you need to adjust to another height, simply loosen the screw, slide the second support 322, align the screw with the other threaded hole, and tighten it; alternatively, you can set two screws and two sets of corresponding through holes and threaded holes to enhance the reliability of locking.

[0066] The support part 32 adopts a telescopic structure in which the first support part 321 and the second support part 322 are fitted together in a sliding fit, so that the total height of the support part 32 can be adjusted as needed; when facing different protective layer thicknesses, the same set of devices only needs to adjust the telescopic length to meet the requirements; when facing slightly uneven beam surfaces, the telescopic length of each support structure 3 can be adjusted separately to ensure that all steel bar clamps 2 are on the same horizontal plane, which greatly enhances the adaptability and versatility of the device.

[0067] Reference Figure 6 In one specific embodiment, the rebar clamp 2 of this application is designed as a split structure, that is, a complete rebar clamp 2 is composed of multiple detachable clamp segments 23 spliced ​​together, and adjacent clamp segments 23 can be quickly spliced ​​together by means of tenon joint, bolt connection or snap-fit ​​connection.

[0068] Specifically, when using the tenon joint method, a dovetail groove or T-groove can be machined at the end of one clamping segment 23, and a matching protrusion can be machined at the end of the adjacent clamping segment 23. The protrusion is inserted into the dovetail groove and slid along the length direction to splice the two clamping segments 23 together. To prevent slippage and separation, a stop screw can be set at the connection.

[0069] When using bolted connections, a connecting plate can be pre-welded or machined at the end of each clamping section 23. The connecting plate has bolt holes. The connecting plates of two adjacent clamping sections 23 are then attached together, and bolts are passed through the bolt holes and nuts are tightened.

[0070] When using a snap-fit ​​connection, an elastic hook can be provided at the end of one clamping section 23, and a slot 22 can be provided at the end of the other clamping section 23. The elastic hook is pushed into the slot 22, and the engagement is achieved by elastic deformation. When disassembly is required, the hook can be pressed to disengage.

[0071] The rebar clamp 2 adopts a split structure with multiple clamp sections 23 that can be detachably connected, which allows the rebar clamp 2 to be flexibly combined according to the actual required length. When the groove 22 on a certain clamp section 23 is worn due to long-term use, only the clamp section 23 needs to be replaced instead of the entire rebar clamp 2, reducing maintenance costs. At the same time, the split structure also makes it easy to disassemble and store according to the size of the transport vehicle, reducing the space occupied by each transport and further improving the practicality of the device.

[0072] The positioning device provided in this application uses positioning component 1 as the basic unit, integrating rebar clamps 2, support structure 3, and laser module 4 into one unit. It can operate independently as a single component or be combined and expanded with multiple components. In use, laser module 4 quickly sweeps and centers, replacing traditional manual stringing and improving positioning accuracy to the millimeter level. The support structure 3 has a preset height to ensure that the protective layer thickness is formed in one step. Multiple rebar clamps 2 are connected in series along the height direction, which can synchronously position multiple layers of horizontal rebars and ensure the accuracy of the spacing between each layer of rebars. Multiple positioning components 1 are connected in parallel along the length direction to form an overall frame, enabling synchronous construction of multiple evacuation platforms. When the whole is moved, each component works together stably, and the rebar lines are uniform and straight.

[0073] This application effectively solves the technical problems of rebar misalignment, uneven spacing, excessive protective layer thickness, non-straight alignment, low construction efficiency and high rework rate in traditional construction, and significantly improves the construction quality and efficiency of the pre-embedded rebar 8 of the bridge evacuation platform.

[0074] Based on this, this application also discloses a method for constructing pre-embedded reinforcing bars 8 for bridge evacuation platforms using any of the above-mentioned positioning devices. The method includes the following steps: The construction baseline is laid out on the bridge beam surface. Specifically: In the early stages of construction, surveyors use total stations or theodolites to lay out the construction baseline of the evacuation platform to be constructed on the bridge beams. This baseline is usually the longitudinal centerline of the bridge deck, or other reference lines (such as edge lines or control lines) determined according to the design drawings.

[0075] When multiple evacuation platforms are being constructed simultaneously, the baselines corresponding to all evacuation platforms need to be laid out at once to ensure that the relative positions between each baseline are accurate. After the layout is completed, clear lines should be drawn on the baselines with ink or marked with red paint as absolute references for all subsequent positioning work. The layout accuracy should be controlled within ±2mm.

[0076] Place the positioning device on the area to be constructed on the beam surface, so that the support structure 3 of the positioning component 1 contacts the beam surface. Specifically: First, based on the size and quantity of the evacuation platforms currently under construction, select the predetermined number of positioning components 1: In this embodiment, when the evacuation platform needs to be equipped with multiple layers of horizontal pre-embedded steel bars 8 along the height direction, the adjacent steel bar clamps 2 are connected along the height direction of the bridge by the first connecting rod 5, and each steel bar clamp 2 corresponds to one layer of steel bars.

[0077] Then, the assembled positioning device is hoisted or moved to the construction area on the beam surface, so that the fixing part 33 of the support structure 3 of each positioning component 1 is placed stably on the beam surface, ensuring that the entire device is placed stably and does not shake. If there is dust or debris on the beam surface, it should be cleaned beforehand. After positioning, check whether all support structures 3 are in good contact with the beam surface.

[0078] Activate the laser module 4 on positioning component 1, and adjust the position of positioning component 1 so that its emitted laser beam is aligned with the construction baseline. Specifically: Construction workers activate the laser module 4 installed on each positioning component 1. At this time, the laser module 4 will emit a bright line laser beam (or a dot or cross laser beam as needed). The line laser beam can project a bright line of light onto the beam surface, which is convenient for comparison with the ink line reference on the beam surface.

[0079] Construction workers independently adjust the horizontal position of each positioning component 1 on the beam surface (by slightly pushing or prying) so that the laser beam emitted by the laser module 4 on each positioning component 1 coincides with its corresponding construction baseline.

[0080] At this stage, the positioning components 1 are not yet connected by the second connecting rod 6, and they are adjusted independently without interfering with each other, so as to ensure that each positioning component 1 can be aligned with the baseline of its respective evacuation platform.

[0081] In this embodiment, when multiple evacuation platforms are being constructed simultaneously, after all positioning components 1 have been independently aligned, the second connecting rod 6 is used to connect adjacent positioning components 1 along the length of the bridge to form an integral positioning frame. During connection, care should be taken to keep the position of each positioning component 1 unchanged to avoid displacement during the connection process.

[0082] After the connection is completed, check again whether the laser beams of each positioning component 1 still coincide with the construction baseline. If there is a slight offset, fine adjustment can be made. After that, due to the existence of the overall frame, the relative positions between each positioning component 1 are locked, which can maintain overall stability and positioning consistency during subsequent construction and transfer, and ensure the uniformity of the steel bar lines of each evacuation platform.

[0083] With the positioning component 1 in its limited position, the pre-embedded steel bars 8 of the evacuation platform are tied. Specifically: After alignment, the positions of all rebar clamps 2 are locked. Construction workers place the pre-embedded rebars 8 to be tied one by one into the cavity 21 of each rebar clamp 2 and let them fall into the corresponding slot 22. In the case where multiple rebar clamps 2 are set along the height direction (i.e., the evacuation platform has multiple layers of horizontal pre-embedded rebars 8), each rebar clamp 2 corresponds to one layer of rebars. Multiple rebars in the same layer are limited by the slot 22 on the rebar clamp 2 of that layer. The spacing between rebars in different layers is controlled by rebar clamps 2 of different heights.

[0084] Since the position and spacing of the slots 22 are pre-processed according to the design drawings, the plane position and spacing of the steel bars are limited after they fall into the slots 22. At the same time, since the height of the support structure 3 is preset to the height of the steel bar clamps 2 relative to the beam surface, the top elevation of the steel bars is also limited after they are placed at the bottom, thus ensuring the thickness of the protective layer.

[0085] With the device in a reliable limiting state, construction workers bind or weld the embedded steel bars 8 to fix them. For multi-layer steel bar clamps 2 (i.e., multi-layer horizontal steel bars), construction should start from the bottom layer and bind layer by layer upwards. After each layer is bound, check whether the position of the steel bars in that layer is correct. When binding, tie wire can be used to firmly bind the embedded steel bars 8 to the pre-reserved connecting steel bars in the bridge beam. The binding torque should meet the specifications. When welding, care should be taken to protect the device from damage by electric arc. A protective cover can be set at the welding part. Throughout the binding process, the device remains in its original position and continuously provides a reliable limiting effect until the binding is completed.

[0086] After binding is completed, lift the positioning component 1 upwards, so that the cavity 21 of the rebar clamp 2 disengages from the bound and fixed pre-embedded rebar 8. Specifically: After the reinforcement binding of one or more evacuation platform areas is completed, the construction personnel hold the appropriate part of the support structure 3 or the reinforcement clamp 2 and lift the entire positioning device vertically and steadily upward. During the lifting process, the reinforcement will slide out from the opening of the slot 22, and all the cavities 21 and slots 22 of the reinforcement clamp 2 will simultaneously and without obstruction detach from the pre-embedded reinforcement 8 that has been bound and fixed.

[0087] For an overall frame composed of multiple positioning components 1 connected together, multiple people need to work together to lift it at the same time, or hoisting equipment can be used for assistance; alternatively, the second connecting rod 6 can be removed first, the overall frame can be disassembled into individual positioning components 1, lifted separately, moved to the next work station, and then reassembled.

[0088] Move the positioning device to the next area to be worked on, and repeat the above steps. Specifically: The lifted and moved positioning device is moved along the length of the bridge to the next set of evacuation platform areas to be constructed (i.e., the next set of construction positions), and then the above operations are repeated, namely: device positioning, quick centering, steel bar clamping and binding, device removal... This cycle is repeated until the construction of all the pre-embedded steel bars 8 of the evacuation platforms of the entire bridge is completed.

[0089] This construction method simplifies the complex task of positioning pre-embedded rebar into a standardized process of "laying out lines, positioning, centering, tying rebars, lifting, and moving." The process is clear and the actions are well-defined, allowing even workers new to the tool to master it after simple training. Laser centering replaces the traditional manual method of measuring each rebar individually, reducing positioning time from minutes to seconds, significantly improving efficiency and accuracy. The lift-and-detach design allows the device to quickly and seamlessly detach from the tied rebars and move to the next work station, achieving true assembly line operation. This is particularly suitable for the construction of multiple evacuation platforms on long-span bridges, or the simultaneous construction of multiple spaced evacuation platforms.

[0090] The entire method has low requirements for worker skills, high standardization, significantly improves construction efficiency and first-time acceptance rate, and effectively reduces rework rate and labor costs. After adopting this method and device, the positioning efficiency of the pre-embedded steel bars 8 can be improved, and the first-time acceptance rate can be increased, basically eliminating rework caused by steel bar misalignment, uneven spacing, and excessive protective layer thickness.

[0091] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A positioning device for pre-embedded reinforcing bars in bridge evacuation platforms, characterized in that: Includes at least one positioning component; each positioning component includes: At least one rebar clamp, the rebar clamp having a cavity for accommodating and limiting the pre-embedded rebar; A support structure for installation on a bridge, the support structure being connected to the rebar clamp to support the rebar clamp on the bridge; A laser module, located on the supporting structure or the steel bar clamp, is used to emit a laser beam to guide the steel bar clamp to align with a preset baseline on the bridge.

2. The positioning device for pre-embedded reinforcing bars in bridge evacuation platforms according to claim 1, characterized in that: The positioning component includes at least two steel bar clamps, which are arranged along the height direction of the bridge, and adjacent steel bar clamps are connected by a first connecting rod.

3. The positioning device for pre-embedded reinforcing bars in bridge evacuation platforms according to claim 1, characterized in that: The positioning device includes at least two positioning components, which are arranged along the length of the bridge, and adjacent positioning components are connected by a second connecting rod.

4. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 1, characterized in that: The rebar clamp is provided with multiple slots, which are connected to the cavity and correspond to the pre-embedded rebar.

5. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 4, characterized in that: The plurality of slots are evenly distributed along the circumference of the steel bar clamp.

6. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 1, characterized in that: The supporting structure is located on the side of the rebar clamp and includes a connecting part, a supporting part, and a fixing part. The connecting part is connected to the rebar clamp, the fixing part is installed on the bridge, and the supporting part connects the connecting part and the fixing part.

7. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 6, characterized in that: The support portion is retractable and includes a first support portion and a second support portion. The first support portion is sleeved on the outside of the second support portion. One end of the first support portion is connected to the fixing portion, and one end of the second support portion is connected to the connecting portion. The second support portion is slidably disposed inside the first support portion and its relative position is locked by a locking member.

8. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 7, characterized in that: The locking component includes a screw, the first support portion has a through hole, and the second support portion has a plurality of threaded holes along the height direction. The screw passes through the through hole and engages with the threaded holes.

9. The positioning device for pre-embedded reinforcing bars in a bridge evacuation platform according to claim 1, characterized in that: The rebar clamp includes multiple detachable clamp segments, and adjacent clamp segments are connected by tenon joints, bolts, or snap fasteners.

10. A method for constructing pre-embedded steel bars for a bridge evacuation platform using the positioning device according to any one of claims 1-9, characterized in that: Includes the following steps: The construction baseline is laid out on the bridge beam surface; Place the positioning device on the area to be constructed on the beam surface, so that the support structure of the positioning component contacts the beam surface; Turn on the laser module on the positioning component and adjust the position of the positioning component so that the laser beam emitted by it is aligned with the construction baseline. While the positioning component is in its limited position, the pre-embedded steel bars of the evacuation platform are tied. After binding is completed, lift the positioning component upwards to disengage the cavity of the rebar clamp from the pre-embedded rebar that has been bound and fixed. Move the positioning device to the next construction area and repeat the above steps.

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