A skid shoe device without unloading and a skid distance measuring method

Abstract

This invention discloses a sliding shoe device and a sliding distance measurement method for non-unloading sliding construction, belonging to the field of sliding construction technology for large-span steel structures. The device includes a truss node, a sliding track node, a sliding support node, and a column top support node; the column base plate at the bottom of the truss node directly serves as the main body of the sliding shoe, sliding in contact with the sliding track. Lateral limiters are installed on both sides of the column base plate to prevent lateral deviation; the top elevation of the sliding track is higher than the top elevation of the column top support, enabling continuous non-unloading sliding; a laser rangefinder is installed along the sliding direction to collect displacement data in real time. The method includes steps such as installing the laser rangefinder, starting the sliding, real-time distance measurement, and data transmission, and can be set with endpoint alarms and deviation alarms. This invention eliminates the need for separately manufactured sliding shoes, simplifies temporary structures, achieves continuous non-unloading construction, and can accurately monitor the sliding stroke in real time, significantly improving construction efficiency, safety, and economy.

Description

Technical Field

[0001] This invention relates to the field of sliding construction technology for large-span steel structures, and more specifically, to a sliding shoe device for sliding without unloading and a sliding distance measurement method. Background Technology

[0002] Currently, large-span steel trusses, steel frames, and other components often employ integral sliding construction technology, which is widely used. However, existing sliding technology has many shortcomings in terms of efficiency, structure, and monitoring, making it difficult to meet the demands of high-efficiency construction.

[0003] First, conventional sliding construction at present requires additional processing of sliding shoes and fixing them to the bottom of the components. The self-weight of the components and the construction load need to be transferred through temporary sliding shoes. This not only results in a large number of components to be assembled and high costs for temporary measures, but also in complicated processing, transportation, installation and dismantling procedures for the sliding shoes, which consumes a lot of manpower and time, seriously affecting construction efficiency.

[0004] Secondly, traditional sliding systems lack dedicated lateral restraint structures, which can easily lead to lateral deviation and lateral movement during the sliding process, causing problems such as track jamming and abnormal structural stress, requiring work stoppage for rectification, further reducing construction efficiency, and even posing safety hazards.

[0005] In addition, existing sliding displacement monitoring relies mainly on manual total station and tape measure measurements at regular intervals. The data is lagging, the measurement error is large, and it is impossible to provide real-time feedback on the sliding movement status. This makes it difficult to meet the requirements of high-precision construction control. Furthermore, manual measurement requires a lot of manpower, resulting in low monitoring efficiency and indirectly affecting the construction progress.

[0006] Furthermore, traditional sliding operations often employ segmented unloading and intermittent sliding operations, requiring frequent jacking, unloading, and pad adjustment. This results in complex construction procedures, long operation cycles, and high risks associated with high-altitude and temporary support operations. Consequently, continuous and stable sliding construction without unloading cannot be achieved, significantly hindering the efficiency of sliding construction.

[0007] In summary, existing sliding devices suffer from redundant structures, insufficient limit protection, outdated monitoring methods, and cumbersome construction processes. They are not only unsafe and uneconomical, but also suffer from low construction efficiency, making them unsuitable for the needs of efficient, safe, and low-cost unloading sliding construction. Therefore, there is an urgent need to propose a non-unloading sliding shoe device and distance measurement method that is structurally simple, has reliable limit protection, can measure distances in real time, and has the advantages of efficient construction. Summary of the Invention

[0008] The purpose of this invention is to solve the problems of cumbersome installation of sliding shoes, inconvenient positioning, lagging monitoring, and inability to perform unloading operations in existing sliding construction, and to propose a sliding shoe device and sliding distance measurement method for unloading sliding.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A non-unloading sliding shoe device includes:

[0011] The truss node has a column base plate at its bottom, which directly serves as the main body of the slipper.

[0012] The sliding track node is used to support and guide the sliding of the column base plate;

[0013] A sliding support node provides fixed support for the sliding track node;

[0014] The column top support node is located at the end of the sliding movement and is used to support the truss node after the sliding movement is completed.

[0015] The bottom surface of the column base plate is in sliding contact with the top surface of the sliding track node.

[0016] In some embodiments, at least two lateral limiters are further included, which are symmetrically arranged on both sides of the column base plate; the lateral limiters are fixedly connected to the top and side surfaces of the column base plate, and their bottom surfaces are not connected to the bottom surface of the column base plate.

[0017] In some embodiments, the sliding track node includes a sliding track, and the column top support node includes a column top support; the top elevation of the sliding track is higher than the top elevation of the column top support, so that the truss node is completely supported by the sliding track during the sliding process, and transitions to the column top support after being in place.

[0018] In some embodiments, a laser rangefinder is also included, which is fixedly installed along the sliding direction and its measuring beam is directed toward the truss node or column base plate to acquire sliding displacement data in real time.

[0019] In some embodiments, the column top support node further includes a support plate, which is welded to the side of the column top support and fixed to the concrete column or embedded part.

[0020] In some embodiments, the sliding support node includes a sliding beam and a sliding support column, the sliding beam is provided with a distribution beam, and the sliding track node is fixed to the distribution beam or the sliding beam.

[0021] In some embodiments, the lateral limiter is an L-shaped or rectangular plate, with its vertical side welded to the side of the column base plate and its top surface welded to the top surface of the column base plate.

[0022] In some embodiments, the top surface of the sliding track, the bottom surface of the column base plate, and the top surface of the column top support are all coated with lubricant.

[0023] This embodiment also provides a sliding distance measurement method based on any of the devices described above, including the following steps:

[0024] Step 1: Fix the laser rangefinder on the fixed structure on one side of the sliding start point, and fix the reflective target to the truss node or column base plate;

[0025] Step 2: Start the sliding drive device to make the truss node slide along the sliding track node;

[0026] Step 3: During the sliding process, the laser rangefinder continuously emits laser beams and receives reflected signals to calculate the sliding displacement data of the truss nodes in real time;

[0027] Step 4: Transmit the displacement data to a display terminal or control system for monitoring the sliding stroke.

[0028] In some embodiments, in step three, when the displacement data reaches the preset sliding endpoint distance, the control system issues a stop command or an audible and visual alarm signal; and / or, when the displacement data deviates from the preset trajectory, an offset alarm is issued.

[0029] This invention provides a sliding shoe device and a sliding distance measurement method for unloading sliding, which have the following beneficial effects:

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. Simplified structure and significantly reduced cost: By using the column base plate of the truss node as the main body of the slip shoe, there is no need for additional processing, transportation, installation and dismantling of temporary slip shoes, which greatly reduces the configuration of temporary components, reduces steel consumption and labor costs, and avoids installation problems caused by slip shoe processing errors.

[0032] 2. Reliable lateral limiting and high construction safety: Lateral limiters are symmetrically installed on both sides of the column base plate, and a unique structure of "top and side welding, bottom unwelded" is adopted. This can effectively restrain lateral deviation in the non-sliding direction, prevent safety hazards such as sliding deviation, track jamming, and component instability, and also make it convenient for welding and grinding after sliding into place, avoiding the difficulty of removing the limiters.

[0033] 3. Continuous sliding without unloading significantly improves construction efficiency: By setting the top elevation of the sliding track higher than the top elevation of the column support, the load is smoothly transferred from the track to the support by utilizing the elevation difference. The entire sliding process does not require any lifting, unloading or pad replacement operations, eliminating the cumbersome procedures in traditional processes, shortening the construction period, and reducing the risks of high-altitude and temporary support operations.

[0034] 4. Real-time and accurate displacement monitoring with high control precision: Laser rangefinders are deployed along the sliding direction to collect sliding displacement data in real time, replacing the traditional method of manual measurement with tape measures or total stations at regular intervals. This eliminates data lag and measurement errors, and enables dynamic and continuous monitoring of the sliding process, providing reliable data support for precise positioning.

[0035] 5. Intelligent alarm, anti-overslip and anti-deviation: By comparing displacement data with a preset endpoint threshold, it automatically stops or alarms when approaching the endpoint to avoid overslipping; by comparing distance measurement data from both sides, it promptly detects deviation and alarms, realizing a safe closed-loop control of the sliding process and effectively preventing serious accidents such as collisions and derailments.

[0036] 6. Significant overall construction benefits: This invention forms an integrated solution from device structure to distance measurement method, reducing manual input, shortening the construction cycle, and improving the safety, economy and efficiency of sliding construction. It is particularly suitable for continuous sliding construction of heavy components such as large-span steel trusses and steel frames without unloading. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a three-dimensional schematic diagram of the sliding shoe device for unloading sliding according to the present invention;

[0039] Figure 2 This is a schematic diagram of a truss node;

[0040] Figure 3 This is a schematic diagram of the sliding track node;

[0041] Figure 4 This is a schematic diagram of the column top support node;

[0042] Figure 5 This is a schematic diagram of a sliding support node. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example

[0045] To address the problems of cumbersome construction procedures and high costs caused by the need for additional processing, installation, and removal of temporary sliding shoes in existing technologies, this invention provides a sliding shoe device for unloading and sliding, comprising: a truss node 1 with a column base plate 11 at its bottom, the column base plate 11 directly serving as the main body of the sliding shoe; a sliding track node 2 for supporting and guiding the column base plate 11 to slide; a sliding support node 4 for fixedly supporting the sliding track node 2; and a column top support node 3, located at the sliding endpoint, for supporting the truss node 1 after the sliding is in place; wherein the bottom surface of the column base plate 11 slides in contact with the top surface of the sliding track node 2.

[0046] The bottom of truss node 1 already has a column base plate 11 for connection with the substructure. In this design, the column base plate 11 is used directly as a sliding shoe, eliminating the need for a separate sliding shoe. The lower surface of the column base plate 11 is in direct contact with the upper surface of the sliding track node 2 and slides along the track. The sliding track node 2 is reliably fixed from below by the sliding support node 4. A column top support node 3 is pre-set at the end position of the sliding. After sliding into place, truss node 1 rests on the column top support node 3. This integrated design of "column base plate as sliding shoe" completely eliminates the processing, transportation, installation, and dismantling of the sliding shoe, greatly simplifies the configuration of temporary components, reduces material and labor costs, and avoids quality problems caused by sliding shoe processing errors.

[0047] To prevent lateral displacement, track wear, or jamming of truss node 1 during sliding and to improve sliding safety, this invention further incorporates a lateral limiting structure based on the aforementioned technical solution. Specifically, it includes at least two lateral limiters 12, symmetrically arranged on both sides of the column base plate 11; the lateral limiters 12 are fixedly connected to the top and side surfaces of the column base plate 11, and their bottom surfaces are not connected to the bottom surface of the column base plate 11.

[0048] Lateral limiters 12 are welded to the left and right sides of the column base plate 11, with their vertical sides tightly abutting the sides of the column base plate 11 and their top surfaces resting on and welded to the upper surface of the column base plate 11. Since the bottom surface of the limiter is not welded to the bottom surface of the column base plate 11, after sliding is complete, the limiter can be easily cut off and ground from the top surface without affecting the final welding of the column base plate 11 to the column top support 31. During sliding, the limiters constrain the column base plate 11 from both sides, preventing it from deviating from the centerline of the sliding track 21. This "top and side welded, bottom unwelded" structure effectively constrains displacement in non-sliding directions, preventing deviation and track jamming, and also provides convenience for subsequent positioning and welding, avoiding difficulties in disassembly.

[0049] To achieve continuous, unloading-free sliding without the need for jacking, unloading, or pad replacement throughout the entire process, and to simplify the construction process, this invention defines the elevation relationship based on the above technical solution: the sliding track node 2 includes a sliding track 21, and the column top support node 3 includes a column top support 31; the top elevation of the sliding track 21 is higher than the top elevation of the column top support 31, so that the truss node 1 is completely supported by the sliding track 21 during the sliding process, and transitions to the column top support 31 after being in place.

[0050] The specific working method is as follows: the top surface elevation of the sliding track 21 is set to be slightly higher than the top surface elevation of the column top support 31 by a preset small height difference (e.g., 5mm). In the initial sliding phase, truss node 1 rests completely on the sliding track 21 via the column base plate 11, and the load is transferred to the sliding support node 4 via the track. When the truss slides to the positioning area, the front end of the column base plate 11 first contacts the column top support 31. As the sliding continues, the column base plate 11 gradually transitions from the track to the support. Since the top surface of the support is slightly lower than the top surface of the track, the column base plate 11 is eventually completely supported by the support, and the track is no longer under load. Throughout the process, no lifting or unloading operations are required, achieving a smooth load transition, avoiding the pauses and risks of traditional construction methods, and significantly improving construction efficiency.

[0051] To replace traditional manual measurement and achieve real-time, dynamic, and accurate monitoring of sliding displacement, this invention adds a ranging device based on the above technical solution: it also includes a laser rangefinder 5, which is fixedly set along the sliding direction, and its measuring beam is pointed to the truss node 1 or the column base plate 11, for real-time acquisition of sliding displacement data.

[0052] Its installation and working principle are as follows: A laser rangefinder 5 is installed on a fixed structure (such as a supporting column or existing building) behind the sliding starting point, with its laser emission direction parallel to the sliding direction. A reflective target is installed on the truss node 1 or the column base plate 11. During the sliding process, the laser rangefinder 5 continuously emits a laser beam at a high frequency (e.g., 10Hz) and receives the reflected signal. The internal processor calculates the distance change in real time based on the optical path difference, thereby obtaining accurate data on the sliding distance. This data can be transmitted to the on-site display screen or control system. This non-contact real-time ranging method completely avoids the lag and errors caused by manual measurement, allowing operators to monitor the sliding progress at any time and providing data basis for accurate positioning.

[0053] To enhance the stability of the column top support 31 during the sliding process and prevent the support from overturning or displacing under lateral forces, the present invention further provides a support retaining plate 32: the column top support node 3 also includes a support retaining plate 32, which is welded to the side of the column top support 31 and fixed to the concrete column 34 or the embedded part.

[0054] The column top support 31 is typically welded to an embedded part at the top of the concrete column 34. To further strengthen the fixation, a support clamping plate 32 is welded to the side of the support, and the other side of the clamping plate is firmly welded to the concrete column 34 or the embedded part. The clamping plate can be made of triangular or rectangular steel plates, and multiple plates are set around the support. This double fixing measure effectively resists the horizontal impact force that may be generated during slippage, ensures that the support position remains accurate and unchanged, and provides a stable and reliable support foundation for the final positioning of the truss.

[0055] To ensure that the sliding track 21 has sufficient load-bearing capacity and overall rigidity to withstand the self-weight and sliding thrust of the large-span steel structure, the present invention specifically defines the sliding support node 4: the sliding support node 4 includes a sliding beam 41 and a sliding support column 44, the sliding beam 41 is provided with a distribution beam 43, and the sliding track node 2 is fixed to the distribution beam 43 or the sliding beam 41.

[0056] The structural relationship is as follows: the sliding support column 44 is vertically fixed to the ground or an existing foundation, and a sliding beam 41 is installed at the top of the column. The sliding beam 41 is usually a multi-web box girder with transverse stiffening ribs inside to significantly improve bending stiffness. The distribution beam 43 is arranged perpendicular to the sliding beam 41 and is used to distribute the concentrated load transmitted from the sliding track 21 to the sliding beam 41. The sliding track 21 is fixed to the distribution beam 43 or directly to the sliding beam 41 by the track clamping plate 22. This multi-layer force transmission system ensures that the track does not deform excessively under heavy sliding loads, guaranteeing the smoothness and safety of sliding.

[0057] To further clarify the feasible structure of the lateral limiter 12 and facilitate processing and welding, the present invention defines the specific shape of the lateral limiter 12: the lateral limiter 12 is an L-shaped or rectangular plate, its vertical side is welded to the side of the column base plate 11, and its top surface is welded to the top surface of the column base plate 11.

[0058] Its structural advantages lie in the fact that L-shaped or rectangular panels are common cut parts from steel profiles or plates, making them easy to process. The L-shaped limiter can naturally conform to the corners of the column base plate 11, with one side welded to the top surface of the column base plate 11 and the other side welded to the side surface, forming a stable fillet weld. Rectangular panels can achieve the same function through vertical welding. This simple geometry, while ensuring the limiting function, minimizes manufacturing costs and reduces welding workload and ease of quality control during on-site installation.

[0059] In order to reduce the sliding friction resistance between the column base plate 11 and the sliding track 21 and the column top support 31, reduce the load on the jacking equipment and prevent track wear, the present invention coats the contact surfaces with lubricant: the top surface of the sliding track 21, the bottom surface of the column base plate 11 and the top surface of the column top support 31 are all coated with lubricant.

[0060] The specific implementation method is as follows: Before the sliding construction, the bottom surface of the column base plate 11 is ground and rust-removed, and then evenly coated with grease or other special lubricant; similarly, the top surface of the sliding track 21 and the top surface of the column top support 31 are also coated with grease. The grease layer can form a lubricating film with low shear strength, significantly reducing the friction coefficient between metals. Tests have shown that the frictional resistance can be reduced by more than 50% after applying grease. This not only reduces the energy consumption of the hydraulic jacking device, but also avoids problems such as track edge chipping and slipper scratches caused by excessive friction, thus extending the service life of the equipment.

[0061] To systematically address the problem of outdated displacement monitoring methods and lack of real-time feedback in existing sliding construction, this invention provides a sliding distance measurement method based on the aforementioned device, comprising the following steps: Step 1: Fixing the laser rangefinder 5 on a fixed structure on one side of the sliding starting point, and fixing the reflective target to the truss node 1 or column base plate 11; Step 2: Activating the sliding drive device to make the truss node 1 slide along the sliding track node 2; Step 3: During the sliding process, the laser rangefinder 5 continuously emits laser beams and receives reflected signals, calculating the sliding displacement data of the truss node 1 in real time; Step 4: Transmitting the displacement data to a display terminal or control system for monitoring the sliding stroke.

[0062] Unlike traditional manual timed measurements, this method completes the installation and light calibration of the laser rangefinder 5 and the target before the sliding process begins. During the sliding process, the laser rangefinder 5 continuously updates the displacement value with a millisecond-level sampling period and sends it in real time to the display screen of the on-site operator or the central control room. The operator can accurately know the current position without approaching the sliding component, thus enabling timely adjustments to the jacking speed and stroke. This automated process of "measuring immediately after installation and measuring while sliding" eliminates the personal safety risks and measurement errors of manual measurement, transforming sliding control from "post-inspection" to "process guidance," greatly improving construction accuracy and efficiency.

[0063] In order to provide timely warnings when the slippage approaches the end point or when deviation occurs, and to prevent overslipping or safety accidents, the present invention adds an alarm and control step based on claim 9: In step three, when the displacement data reaches the preset slippage end point distance, the control system issues a stop command or an audible and visual alarm signal; and / or, when the displacement data deviates from the preset trajectory, a deviation alarm is issued.

[0064] The specific logic is as follows: A threshold value for the total sliding stroke is preset in the control system (e.g., if the designed sliding distance is 30m, the threshold value is set to 29.99m). When the measured displacement value of the laser rangefinder 5 reaches this threshold, the system automatically sends a stop signal to the control valve of the hydraulic jacking equipment, or triggers an alarm to remind the operator to manually stop. Additionally, if the device has multiple laser rangefinders 5 (e.g., one on each side), when the displacement difference between the two sides exceeds the allowable range (e.g., 5mm), the system determines that a misalignment has occurred, issues a misalignment alarm, and prompts the operator to adjust the jacking force on both sides. This intelligent alarm mechanism effectively avoids serious accidents such as structural collisions and derailments caused by over-slipping or misalignment, achieving safe closed-loop control of the sliding process.

[0065] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. This embodiment takes the sliding construction of a large-span steel truss factory building as an example, but the scope of protection of the present invention is not limited thereto.

[0066] I. Project Overview

[0067] The steel truss to be slid has a span of 60 meters and a total weight of approximately 320 tons. It needs to be slid as a whole 30 meters from the assembly site along the sliding direction to its final position. Two sliding tracks are set up, spaced 8 meters apart. The sliding shoe device and sliding distance measurement method without unloading described in this invention are used.

[0068] II. Device Composition and Connections

[0069] Figure 1 This is a three-dimensional schematic diagram of the sliding shoe device for unloading in this embodiment. The figure mainly shows truss node 1, sliding track node 2, column top support node 3, sliding support node 4, and laser rangefinder 5.

[0070] See Figure 2 Truss node 1 includes a column base plate 11, lateral limiters 12, truss node members 13, and a jacking point 14. The column base plate 11 is a 40mm thick steel plate, 1.2m long and 0.8m wide, with its bottom surface ground and rust removed. The upper surface of the column base plate 11 is welded and fixed to the truss node members 13, directly serving as the main body for sliding movement. A lateral limiter 12 is welded to each side of the column base plate 11 along its length. The lateral limiter 12 is L-shaped and is made of 20mm thick steel plate bent or welded. Its vertical side is welded to the side of the column base plate 11 with continuous fillet welds, and its top surface is welded to the top surface of the column base plate 11 with intermittent fillet welds. The bottom surface of the lateral limiter 12 is not welded to the bottom surface of the column base plate 11, leaving a gap. The lateral limiter 12 is 40mm wide and 80mm high, and there is no gap between it and the side of the column base plate 11 (it is tightly attached). The jacking point 14 is a lug plate with stiffening ribs welded to the rear end of the column base plate 11, used to connect the jack of the hydraulic jacking equipment.

[0071] See Figure 3 The sliding track node 2 includes a sliding track 21, a track clamping plate 22, and a track baffle 23. The sliding track 21 uses U75V steel rails, model QU100, with the top surface coated with grease. The track clamping plate 22 is a machined steel plate component, which is bolted to the sliding beam 41 to press and fix the bottom flange of the sliding track 21. The track baffle 23 is welded to the outside of the sliding track 21 to prevent lateral displacement of the track.

[0072] See Figure 4 The column top support node 3 includes a column top support 31, support plates 32, support embedded parts 33, and a concrete column 34. The column top support 31 is a welded box-shaped steel component with its top surface coated with grease. The base plate of the column top support 31 is welded and fixed to the support embedded part 33 pre-embedded in the top of the concrete column 34. A triangular support plate 32 is welded to each of the four sides of the column top support 31, and the other side of the support plate 32 is welded to the concrete column 34 or the support embedded part 33 to form secondary stability.

[0073] See Figure 5 The sliding support node 4 includes a sliding beam 41, a sliding beam end plate 42, a distribution beam 43, and sliding support columns 44. The sliding support columns 44 are 325mm diameter round steel pipes spaced 3m apart, anchored at the bottom to the concrete foundation. The sliding beam 41 is a multi-web box girder (with an internal transverse stiffening rib every 500mm), 800mm high, resting on top of the sliding support columns 44 and welded in place. The distribution beam 43 is an I-beam, arranged perpendicular to the sliding beam 41 at 1.5m intervals, and welded to the sliding beam 41. The sliding track 21 is fixed to the distribution beam 43 by track clamping plates 22.

[0074] The laser rangefinder 5 is mounted on an independent bracket behind the sliding starting point. The bracket is fixed to the ground to ensure stability and unobstructed movement. The laser rangefinder 5 emits light parallel to the sliding direction, with the beam pointing towards the front end of the column base plate 11. A reflective target is attached to the front end of the column base plate 11. The data cable of the laser rangefinder 5 is connected to the digital display and PLC controller in the field control box. In this embodiment, the sampling frequency of the laser rangefinder 5 is set to 10Hz, and the measurement accuracy is ±1mm.

[0075] III. Construction Steps and Working Principle

[0076] Step 1: Installation Preparation

[0077] Complete the construction of all nodes according to the above connection relationship: pour concrete column 34 and pre-embed support embedded part 33; install sliding support column 44, sliding beam 41, and distribution beam 43; lay sliding track 21 and fix it with track pressure plate 22, and adjust the top elevation of track to +10.000m (this value is an example, and the actual value shall be determined according to the design); weld column top support 31 and install support clamp plate 32, and adjust the top elevation of support to +9.995m (5mm lower than the top elevation of track); evenly apply grease to the top surface of sliding track 21, the bottom surface of column base plate 11, and the top surface of column top support 31.

[0078] Step 2: Truss positioning and distance measuring device installation

[0079] The assembled steel truss is hoisted to the sliding starting point, allowing the column base plate 11 of truss node 1 to fall directly onto the sliding track 21, with the lateral limiters 12 on both sides of the column base plate 11 naturally locking into the track. A laser rangefinder 5 bracket is installed behind the sliding starting point, the laser rangefinder 5 is fixed and aligned with the reflective target at the front end of the column base plate 11, and the initial reading is zeroed. The hydraulic jacking equipment is then connected to the jacking point 14.

[0080] Step 3: Sliding Process

[0081] The hydraulic jacking equipment is activated, and the jacks push the jacking point 14, causing the entire steel truss to slide along the sliding track 21 via truss node 1. Since the top surface of the sliding track 21 is higher than the column top support 31, the entire weight of the truss is transferred to the sliding track 21 through the column base plate 11. The load is then transmitted to the sliding support column 44 via the distribution beam 43 and the sliding beam 41. Lateral limiters 12 constrain the column base plate 11 from both sides, preventing lateral displacement and ensuring a straight sliding direction.

[0082] Simultaneously, the laser rangefinder 5 continuously measures the distance change between the column base plate 11 and the rangefinder at a frequency of 10 times per second, and the real-time displacement data is dynamically refreshed on the control box display screen. The operator adjusts the jacking speed according to the displacement value. In this embodiment, the control system presets an alarm threshold for the sliding end point: the total stroke is 30m, and an audible and visual alarm is set when the displacement reaches 29.99m (i.e., a 10mm advance warning). At the same time, in order to monitor deviation, a laser rangefinder 5 is set on each side of the sliding track. When the difference in displacement readings on both sides exceeds 5mm, the system automatically issues a deviation alarm, prompting the operator to adjust the jacking force on both sides.

[0083] Step 4: Load Transition and Placement

[0084] When the laser rangefinder showed a displacement of 29.98m, the operator reduced the jacking speed. As the truss continued to advance, the front end of the column base plate 11 first contacted the first set of column top supports 31. Since the top surface of the support was 5mm lower than the top surface of the track, the column base plate 11 initially bore the load on the support. When the displacement reached 29.99m, the control system issued an audible and visual alarm, and the operator manually stopped the jacking (or the system stopped automatically). At this point, the column base plate 11 was completely resting on the column top supports 31, and the sliding track 21 was no longer in contact with the bottom surface of the column base plate 11. Throughout the entire process, no lifting, unloading, or pad replacement operations were performed, achieving continuous sliding without unloading.

[0085] Step 5: Final Fixing and Removal

[0086] After verifying that the positioning is correct, weld and fix the column base plate 11 to the column top support 31. Cut off the lateral limiter 12 (cut from the top weld seam; the bottom surface is unwelded, so there is no obstruction), and grind it smooth. Remove the laser rangefinder 5 and its bracket. The sliding support node 4 and sliding track 21 can be retained for subsequent sliding of adjacent spans or for dismantling and reuse.

[0087] IV. Effect Verification

[0088] In this embodiment, a single sliding stroke is 30 meters, with a total time of approximately 2.5 hours (including positioning and adjustment), and no misalignment or rail jamming occurred. Compared to the traditional external sliding shoe solution, it saves approximately 60,000 yuan in sliding shoe processing and installation costs, and approximately 12 man-days in dismantling and grinding time. The laser rangefinder displays the displacement in real time throughout the entire process, with a positioning deviation of only 3mm, far superior to the 15mm deviation of traditional manual measurement. The entire sliding process requires no unloading operations, reducing the risks of working at heights and shortening the construction period by 2 days.

[0089] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0090] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0091] In conclusion, the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sliding shoe device for non-unloading sliding, characterized in that, include: The truss node (1) has a column base plate (11) at its bottom, and the column base plate (11) directly serves as the main body of the slipper; Sliding track node (2) is used to support and guide the sliding of the column base plate (11); Sliding support node (4) provides fixed support for the sliding track node (2); The column top support node (3) is located at the end of the sliding and is used to support the truss node (1) after the sliding is in place. The bottom surface of the column base plate (11) is in sliding contact with the top surface of the sliding track node (2).

2. The sliding shoe device for unloading sliding according to claim 1, characterized in that, It also includes at least two lateral limiters (12), which are symmetrically arranged on both sides of the column base plate (11); the lateral limiters (12) are fixedly connected to the top and side surfaces of the column base plate (11), and their bottom surfaces are not connected to the bottom surfaces of the column base plate (11).

3. The sliding shoe device for unloading sliding according to claim 1, characterized in that, The sliding track node (2) includes a sliding track (21), and the column top support node (3) includes a column top support (31). The top elevation of the sliding track (21) is higher than the top elevation of the column top support (31), so that the truss node (1) is completely supported by the sliding track (21) during the sliding process, and transitions to the column top support (31) after being in place.

4. The sliding shoe device for unloading sliding according to claim 1, characterized in that, It also includes a laser rangefinder (5), which is fixedly set along the sliding direction and its measuring beam is directed at the truss node (1) or the column base plate (11) to obtain sliding displacement data in real time.

5. The sliding shoe device for unloading sliding according to claim 1, characterized in that, The column top support node (3) also includes a support plate (32), which is welded to the side of the column top support (31) and fixed to the concrete column (34) or the embedded part.

6. The sliding shoe device for unloading sliding according to claim 1, characterized in that, The sliding support node (4) includes a sliding beam (41) and a sliding support column (44). A distribution beam (43) is provided on the sliding beam (41), and the sliding track node (2) is fixed on the distribution beam (43) or the sliding beam (41).

7. The sliding shoe device for unloading sliding according to claim 2, characterized in that, The lateral limiter (12) is an L-shaped or rectangular plate, with its vertical side welded to the side of the column base plate (11) and its top surface welded to the top surface of the column base plate (11).

8. The sliding shoe device for unloading sliding according to claim 1, characterized in that, The top surface of the sliding track (21), the bottom surface of the column base plate (11), and the top surface of the column top support (31) are all coated with lubricant.

9. A sliding distance measurement method based on the device according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: Fix the laser rangefinder (5) on the fixed structure on one side of the sliding start point, and fix the reflective target on the truss node (1) or column base plate (11); Step 2: Start the sliding drive device to make the truss node (1) slide along the sliding track node (2); Step 3: During the sliding process, the laser rangefinder (5) continuously emits laser beams and receives reflected signals to calculate the sliding displacement data of the truss node (1) in real time; Step 4: Transmit the displacement data to a display terminal or control system for monitoring the sliding stroke.

10. The sliding distance measurement method according to claim 9, characterized in that, In step three, when the displacement data reaches the preset sliding endpoint distance, the control system issues a stop command or an audible and visual alarm signal; and / or, when the displacement data deviates from the preset trajectory, an offset alarm is issued.

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