Large-span steel-wood composite structure large-temperature-humidity-difference environment support sliding construction method

Abstract

Aiming at a construction method of a large-span steel-wood composite structure in a violent temperature and humidity change environment and aiming at the problem that the friction coefficient of a slip interface is unstable, a composite antifriction layer of a graphene-based lubricating film and a porous wood base plate is adopted, and the self-adjusting characteristic of humidity response gel is combined; the limitation that a traditional lubricant needs to be repeatedly coated is broken through; the sliding device is installed at the preset position and driven by a hydraulic jacking system, so that the sliding rail top plate pressure-bearing steel component is in rigid contact with the preset rail to fix the whole structure; after controllable separation of the sliding units and the slideways is achieved through jacking, the four spherical hinge structures can adjust load distribution of the upper structure in a self-adaptive mode; the modularized jig frame design overcomes the defects that a traditional supporting system is low in dismounting efficiency and poor in adaptability. And a high-reliability and high-precision integrated solution is provided for large-span structure construction in a complex environment.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnels, and specifically to a construction method for the sliding of supports of a large-span steel-wood composite structure in an environment with large temperature and humidity differences. Background Art

[0002] During the construction of a large-span steel-wood composite structure, especially in an environment with large temperature and humidity differences, due to the significant influence of temperature and humidity changes on materials and structures, traditional construction methods often struggle to ensure construction quality and safety. Therefore, a construction method for a large-span steel-wood composite structure that can adapt to an environment with large temperature and humidity differences, and is efficient and safe is needed. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems of dynamic friction control and synchronous accuracy in the sliding construction of large-span steel structures. Traditional sliding processes face multiple bottlenecks: low-alloy steel tracks are prone to expansion and contraction deformation in an alternating temperature and humidity environment; the friction coefficient of the continuous sliding contact surface is significantly affected by environmental humidity, and the friction resistance surges after the lubricating layer fails, doubling the driving energy consumption; the deformation of the structure caused by gravity changes results in the tilting of the sliding shoes; traditional rigidly connected jacks cannot compensate for angular deviations, leading to local stress exceeding the limit and causing the track to be crushed; the adjustment efficiency of the support falsework is low. To solve the above problems, the present invention provides a construction method for the sliding of supports of a large-span steel-wood composite structure in an environment with large temperature and humidity differences.

[0004] The technical solution adopted by the present invention is as follows:

[0005] Step 1: Lay the segmented-designed steel slideways at the predetermined positions and connect them with bolts to ensure the stability of the slideways. Leave expansion joints at the slideway joints to accommodate the deformation of the materials due to temperature and humidity changes.

[0006] Step 2: Set a graphene-based lubricating film and a porous wood substrate on the sliding contact surface. The substrate is embedded with a humidity-responsive gel, and the volume expansion rate of the gel is positively correlated with humidity.

[0007] Step 3: Install the steel slideway on the concrete foundation platform, and pre-embed anchor bolts on the surface to ensure that the level error of the jack installation base ≤ 3 mm / m. Install four sliding shoe ball bowls on the upper slideway plate of the jack; install four pulleys on the lower limit device of the slideway plate, and arrange pressure-bearing steel members and horizontal limit pulleys beside the pulleys respectively.

[0008] Step 4: Fix the sliding track on the steel slideway, and arrange track pressing plates at equal distances along both sides of the bottom of the sliding track; the sliding shoe device consists of a sliding shoe, a sliding shoe top plate, and four spherical hinge structures in the middle. Two sliding shoe horizontal baffles are symmetrically arranged on the inner side of the sliding shoe; the sliding shoe ball bowl is welded to the slideway top plate, the convex surface of the sliding shoe ball crown faces downward and is embedded in the ball bowl, and the flat part of the ball crown is welded to the sliding shoe top plate.

[0009] Step 5: The convex surface of the sliding shoe ball crown and the ball bowl form a rotatable ball joint structure; when the sliding device reaches the predetermined position, the jack lifts the top plate of the slide rail, and the pressure-bearing steel member under the plate forms a rigid contact with the top of the slide rail to fix the overall structure, and the sliding shoe and the pulley are separated from the slide surface. At this time, the upper ball joint structure is unconstrained to ensure that the sliding shoe ball crown of the ball-type articulated sliding shoe device can rotate in the sliding shoe ball bowl during the construction of the upper tire frame; when the rotation angle of the ball bowl is too large, the sliding shoe and the pulley contact the slide to ensure that the sliding shoe top plate does not tilt significantly.

[0010] Step six: The push lugs are rigidly connected to the crawler to drive the crawler to perform push and slide construction on the steel structure; the push lugs act synchronously on the upper and lower parts of the tire frame and the basin-type articulated sliding shoe device. In the sliding start-up stage, the bidirectional push is used to ensure the overall force balance of the device, and the horizontal limit pulley can avoid the sliding shoe overturning or track jamming due to sudden changes in local loads, thereby ensuring the stability of power transmission in the initial stage of sliding.

[0011] Step 7: Use an adjustable sliding tire frame, form a stable support system through the bottom crossbeam and the symmetrically arranged upper chord poles and central diagonal poles, set a limit edge on the top to adapt to the fixation of truss rods with different cross sections, and integrate a sliding chassis at the bottom of the tire frame, which is connected to the top plate of the sliding shoe. The height of the tire frame adopts a standard segmented design, which is convenient for quick disassembly and assembly and adapts to different assembly height requirements.

[0012] Step 8: Assemble a single truss sliding bracket on the tire frame. The bracket has a bracket horizontal bar and a bracket vertical bar. When the height is high and the structure needs to be adjusted, the sliding bracket support jack can be used for auxiliary support. The jack is installed in an appropriate position; when the cable passes through, it is necessary to temporarily remove the jack and adjust its position to ensure the smooth passage of the cable. After the cable is installed, restore the jack to the state before sliding, and it still plays a supporting role; an adjustable top support is provided on the bracket platform.

[0013] Furthermore, the steel slideway is made of Q345B low alloy steel material, connected by bolts, and the expansion joints are filled with two-component polyurethane sealant.

[0014] Furthermore, the concrete cap is pre-embedded with M42 anchor bolts with a pull-out resistance of ≥350kN.

[0015] Furthermore, a stainless steel plate or a polytetrafluoroethylene plate is arranged between the sliding shoe bowl and the sliding shoe crown.

[0016] Furthermore, the limiting device is composed of a pressure-bearing steel member, a roller, a pulley and a horizontal limiting pulley.

[0017] Furthermore, rib-type stiffeners and high-strength bolts are welded on the stress-bearing side of the pressure-bearing steel members to ensure structural stability under long-term lateral constraints.

[0018] Furthermore, a buffer chamber filled with silica gel desiccant and paraffin-based phase change material is provided at the top of the adjustable jack.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The Q345B low-alloy steel track connected by high-strength bolts and the two-component polyurethane expansion joint design, combined with the embedded high anti-pulling force anchor bolts, ensure the structural stability and deformation adaptability of the track system in the environment with large temperature and humidity differences.

[0021] 2. A telescopic joint is reserved in the slideway design, which can naturally absorb the thermal expansion and contraction of steel caused by temperature or humidity changes, and avoid the distortion or fracture of the track caused by material deformation. A special wooden substrate laid on the surface of the slideway is internally provided with a humidity-sensitive gel. When the air is humid, the gel absorbs moisture and expands to fill the wood pores to form a flat surface; when the weather is dry, the gel shrinks and restores elasticity, always keeping the thickness of the lubricating layer on the slideway surface uniform.

[0022] 3. The sliding device adopts a double insurance design of spherical joints and pulleys. The spherical joint allows the support to swing freely in the front, back, left, and right directions with a small amplitude, and can automatically correct the horizontal deviation of 3-5 cm during the construction process, avoiding the jamming phenomenon caused by uneven foundation or installation errors. When encountering a large deviation, the pulley will contact the slideway to form a physical limit to prevent the support from tilting excessively.

[0023] 4. The modular adjustable falsework system integrates standardized segments, multi-directional support members, and sliding chassis, combined with the auxiliary support of the limit edge and the sliding support jack, to achieve the rapid positioning and height self-adaptive adjustment of trusses with different cross-sections, significantly improving the assembly efficiency and structural adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the front view of the support sliding construction structure of the long-span steel-wood composite structure in the environment with large temperature and humidity differences in the embodiment of the present invention;

[0025] Figure 2 is the side view of the support sliding construction structure in the embodiment of the present invention;

[0026] Figure 3 is the front view of the limit device and the slide rail structure in the embodiment of the present invention;

[0027] Figure 4 is the front view of the limit device in the embodiment of the present invention;

[0028] Figure 5 is the front view of the falsework and the single-truss assembled sliding support in the embodiment of the present invention

[0029] Figure 6 is the front view of the single-truss assembled sliding support in the embodiment of the present invention

[0030] Figure 7 It is a drawing showing the installation steps of the tire rack and the single-truss sliding support in the embodiments of the present invention.

[0031] Among them, 1 is a steel slideway; 1-1 is a bolt; 1-2 is a graphene-based lubricating film; 1-3 is a porous wood substrate; 2-1 is a concrete bearing platform; 2-2 is a pre-embedded anchor bolt; 2-3 is a hydraulic jack group; 2-4 is a slideway top plate; 2-5 is a slide shoe ball bowl; 2-6 is a pulley; 2-7 is a bearing steel member; 2-8 is a horizontal limiting pulley; 2-9 is a sliding track; 2-10 is a track pressing plate; 2-11 is a slide shoe; 2-12 is a slide shoe top plate; 2-13 is a slide shoe ball crown; 2-14 is a slide shoe horizontal baffle; 2-15 is a stiffening plate; 2-16 is a high-strength bolt; 3 is a tire rack; 3-1 is a bottom cross beam; 3-2 is an upper chord vertical rod; 3-3 is a central diagonal rod; 3-4 is a limiting edge; 4 is a single-truss sliding support; 4-1 is a jack; 4-2 is a support cross bar; 4-3 is a support vertical rod; 4-4 is a support platform; 4-5 is an adjustable jacking support; 5 is a crawler; 5-1 is a pushing ear plate. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1-7 , the present invention provides a technical solution: a method for sliding construction of a support for a large-span steel-wood composite structure in a large temperature and humidity difference environment, including the following steps:

[0034] Step 1: Lay the segmented-designed steel slideways at the predetermined positions and connect them with bolts to ensure the stability of the slideways. Leave expansion joints at the slideway joints to accommodate the deformation of the materials due to temperature and humidity changes.

[0035] Step 2: Set a graphene-based lubricating film and a porous wood substrate on the sliding contact surface, and embed a humidity-responsive gel in the substrate. The volume expansion rate of the gel is positively correlated with the humidity.

[0036] Step 3: Install the steel slideway on the concrete bearing platform, and pre-embed anchor bolts on the surface to ensure that the level error of the jack installation base ≤ 3 mm / m. Install four slide shoe ball bowls on the upper slideway top plate of the jack; install four pulleys on the lower limiting device of the slideway top plate, and arrange bearing steel members and horizontal limiting pulleys beside the pulleys respectively.

[0037] Step 4: The sliding track is fixed on the steel slideway, and track pressure plates are arranged equidistantly along both sides of the track at the bottom of the sliding track; the sliding shoe device consists of a sliding shoe, a sliding shoe top plate and four ball joint structures in the middle, and two sliding shoe horizontal baffles are symmetrically arranged on the inner side of the sliding shoe; the sliding shoe ball bowl is welded to the top plate of the slide rail, the convex surface of the sliding shoe ball crown is embedded in the ball bowl downward, and the flat part of the ball crown is welded to the sliding shoe top plate.

[0038] Step 5: The convex surface of the sliding shoe ball crown and the ball bowl form a rotatable ball joint structure; when the sliding device reaches the predetermined position, the jack lifts the top plate of the slide rail, and the pressure-bearing steel member under the plate forms a rigid contact with the top of the slide rail to fix the overall structure, and the sliding shoe and the pulley are separated from the slide surface. At this time, the upper ball joint structure is unconstrained to ensure that the sliding shoe ball crown of the ball-type articulated sliding shoe device can rotate in the sliding shoe ball bowl during the construction of the upper tire frame; when the rotation angle of the ball bowl is too large, the sliding shoe and the pulley contact the slide to ensure that the sliding shoe top plate does not tilt significantly.

[0039] Step 6: The push lugs are rigidly connected to the crawler to drive the crawler to perform push and slide construction on the steel structure; the push lugs act synchronously on the upper and lower parts of the tire frame and the basin-type articulated sliding shoe device. In the sliding start-up stage, the bidirectional push is used to ensure the overall force balance of the device, and the horizontal limit pulley can avoid the sliding shoe overturning or track jamming due to sudden changes in local loads, thereby ensuring the stability of power transmission in the initial stage of sliding.

[0040] Step 7: Use an adjustable sliding tire frame, form a stable support system through the bottom crossbeam and the symmetrically arranged upper chord poles and central diagonal poles, set a limit edge on the top to adapt to the fixation of truss rods with different cross sections, and integrate a sliding chassis at the bottom of the tire frame, which is connected to the top plate of the sliding shoe. The height of the tire frame adopts a standard segmented design, which is convenient for quick disassembly and assembly and adapts to different assembly height requirements.

[0041] Step 8: Assemble a single-beam sliding bracket on the tire frame. The bracket has a bracket cross bar and a bracket vertical bar. When the height is high and the structure needs to be adjusted, the sliding bracket support jack can be used for auxiliary support. The jack is installed in an appropriate position; when the cable passes through, it is necessary to temporarily remove the jack and adjust its position to ensure the smooth passage of the cable. After the cable is installed, restore the jack to the state before sliding, and it still plays a supporting role; an adjustable top support is provided on the bracket platform.

[0042] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sliding construction method for a large-span steel-wood composite structure support in a large temperature and humidity difference environment, characterized in that: Step 1: Lay the steel slideway (1) designed in sections according to the predetermined position and connect them with bolts (1-1) to ensure the stability of the slideway. Reserve expansion joints at the joints of the slideway to accommodate the deformation of the material due to changes in temperature and humidity; Step 2: A graphene-based lubricating film (1-2) and a porous wood substrate (1-3) are set on the sliding contact surface, and a humidity-responsive gel is embedded in the substrate, and the volume expansion rate of the gel is positively correlated with the humidity. Step 3: The steel slideway (1) is installed on the concrete pedestal (2-1), and anchor bolts (2-2) are pre-buried on the surface to ensure that the horizontal error of the installation base of the jack (2-3) is ≤3mm / m. Four sliding shoe bowls (2-5) are installed on the top plate (2-4) of the jack; four pulleys (2-6) are installed on the lower limit device of the top plate of the slideway, and pressure-bearing steel components (2-7) and horizontal limit pulleys (2-8) are arranged next to the pulleys. Step 4: The sliding track (2-9) is fixed on the steel slideway (1), and the track pressure plates (2-10) are arranged equidistantly along both sides of the bottom of the sliding track (2-9); the sliding shoe device is composed of a sliding shoe (2-11), a sliding shoe top plate (2-12) and four ball joint structures in the middle, and two sliding shoe horizontal baffles (2-14) are symmetrically arranged on the inner side of the sliding shoe; the sliding shoe ball bowl (2-5) is welded to the sliding track top plate (2-4), and the sliding shoe ball crown (2-13) is embedded in the ball bowl (2-5) with the convex surface downward, and the flat part of the ball crown is welded to the sliding shoe top plate (2-12). Step 5: The convex surface of the sliding shoe ball crown (2-13) and the ball bowl (2-5) form a rotatable ball joint structure; when the sliding device reaches the predetermined position, the jack (2-3) lifts the slide rail top plate (2-4), and the pressure-bearing steel member (2-7) under the plate forms a rigid contact with the upper part of the slide rail (2-9) to fix the overall structure, and the sliding shoe (2-11) and the pulley (2-6) are separated from the surface of the slideway (1). At this time, the upper ball joint structure is unconstrained to ensure that the sliding shoe ball crown (2-11) of the ball-type articulated sliding shoe device can rotate in the sliding shoe ball bowl (2-5) when the upper tire frame (3) is constructed; when the rotation angle of the ball bowl (2-13) is too large, the sliding shoe (2-11) and the pulley (2-6) contact the slideway to ensure that the sliding shoe top plate (2-12) does not tilt significantly. Step 6: The pushing ear plate (5-1) is rigidly connected to the crawler (5), and the crawler (5) is driven to perform pushing and sliding construction on the steel structure; the pushing ear plate (5-1) acts synchronously on the tire frame (3) and the upper and lower parts of the basin-type hinged sliding shoe device (the sliding shoe top plate (2-12) and the slide rail top plate (2-4)). In the sliding start-up stage, the bidirectional pushing is used to ensure that the overall force of the device is balanced, and the horizontal limit pulley (2-8) can avoid the sliding shoe (2-11) from overturning or the track from getting stuck due to sudden changes in local loads, thereby ensuring the stability of power transmission in the initial stage of sliding. Step 7: Use an adjustable sliding tire frame (3), form a stable support system through the bottom crossbeam (3-1) and the symmetrically arranged upper chord uprights (3-2) and the center diagonal rod (3-3), set a limit edge (3-4) on the top to adapt to the fixation of truss rods with different cross sections, and integrate a sliding chassis at the bottom of the tire frame, which is connected to the sliding shoe top plate (2-12). The height of the tire frame adopts a standard segmented design, which is convenient for rapid disassembly and assembly and adapts to different assembly height requirements. Step 8: Assemble a single-beam sliding bracket (4) on the tire frame (3). The bracket has a bracket cross bar (4-2) and a bracket vertical bar (4-3). When the height is high and the structure needs to be adjusted, the sliding bracket support jack (4-1) can be used for auxiliary support. The jack is installed in an appropriate position; when the cable passes through, it is necessary to temporarily remove the jack (4-1) and adjust its position to ensure the smooth passage of the cable. After the cable is installed, the jack (4-1) is restored to the state before sliding, and it still plays a supporting role; an adjustable top support (4-5) is provided on the bracket platform (4-4).

2. According to claim 1, a large-span steel-wood composite structure large temperature and humidity difference environment support sliding construction method is characterized by: The steel slideway (1) is made of Q345B low alloy steel material, connected by bolts (1-1), and the expansion joint is filled with a two-component polyurethane sealant.

3. The sliding construction method of a large-span steel-wood composite structure support in a large temperature and humidity difference environment according to claim 1 is characterized by: The concrete cap (2-1) is pre-embedded with M42 anchor bolts (2-2) (with a pull-out force ≥ 350 kN).

4. The sliding construction method of a large-span steel-wood composite structure support in a large temperature and humidity difference environment according to claim 1 is characterized in that: A stainless steel plate or a polytetrafluoroethylene plate is arranged between the sliding shoe ball bowl (2-5) and the sliding shoe ball crown (2-5).

5. The sliding construction method of a large-span steel-wood composite structure support in a large temperature and humidity difference environment according to claim 1 is characterized in that: The limiting device comprises a pressure-bearing steel member (2-7), a roller (2-15), a pulley (2-6) and a horizontal limiting pulley (2-8).

6. The sliding construction method of a large-span steel-wood composite structure support in a large temperature and humidity difference environment according to claim 1 is characterized in that: The ribbed stiffener (2-15) and high-strength bolts (2-16) are welded on the stress-bearing side of the pressure-bearing steel member to ensure that the limit device maintains structural stability in long-term lateral restraint.

7. The sliding construction method of a large-span steel-wood composite structure support in a large temperature and humidity difference environment according to claim 1 is characterized in that: A buffer chamber is arranged on the top of the adjustable top support (4-5) and is filled with silica gel desiccant and paraffin-based phase change material.

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