Method for controlling connection precision of large-span steel-wood composite structure in environment with large temperature and humidity difference

Abstract

The invention discloses a connection precision control method for a large-span steel-wood composite structure in a large temperature and humidity difference environment, which dynamically adjusts the contact pressure between a steel insert plate component and a laminated wood beam based on a prestressed cable, and allows micro-displacement compensation of a steel-wood interface along a temperature and humidity deformation direction by combining a composite sliding interface formed by a laminated wood block and a support rod. The elastic liner buffers local stress, the limiting sliding groove directionally restrains a deformation path, cooperative control over interface sliding and structural rigidity is achieved, and the method is suitable for precision self-adaptive regulation and control over key joints in steel-wood composite structures such as large-span gymnasiums and exhibition halls. Through a prestress and micro-displacement compensation mechanism, material expansion and shrinkage deformation caused by temperature and humidity changes is counteracted, the connection precision error is reduced, harmful stress is directionally released through a sliding interface, the beneficial effects of reducing structural fatigue damage and prolonging the service life are achieved, interface abrasion is reduced through the elastic liner and the low-friction anti-corrosion coating, corrosion resistance is improved, and the service life is prolonged. And the long-term service stability is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure engineering, and relates to the connection node design of large-span steel-wood composite structures. Specifically, it is a method for controlling the connection accuracy of large-span steel-wood composite structures in a large temperature and humidity difference environment. Background Art

[0002] Temperature and humidity fluctuations will cause the difference in the expansion coefficients of steel and wood materials to be amplified. Traditional rigid connections are prone to millimeter-level misalignment, threatening the safety of large-span buildings. Existing passive adjustment technologies are difficult to cope with non-linear deformation, and many landmark projects urgently need a full-life cycle accuracy control method. Therefore, there is an urgent need for a method for controlling the connection accuracy of large-span steel-wood composite structures in a high-precision large temperature and humidity difference environment. Summary of the Invention

[0003] The object of the present invention is to solve the construction problem of the connection accuracy of large-span steel-wood composite structures in a large temperature and humidity difference environment. In the construction of large-span projects such as large public buildings and stadiums, although the composite application of steel and wood can give play to the complementary advantages of material properties, the construction of the combined structure of the two is more difficult than that of a single material. It is necessary to overcome the problem of the mismatch of shrinkage rates between steel and wood due to temperature and humidity differences, and it is necessary to solve the problem that the deformation compensation amount of traditional nodes is insufficient and cannot cover the cumulative deformation of large-span structures, resulting in stress concentration or structural cracking. It is necessary to solve the problem that conventional galvanized steel parts undergo electrochemical corrosion in a humid environment and wood absorbs moisture and expands, resulting in reduced durability. In addition, the existing sensors have low accuracy and poor anti-interference ability, and cannot give real-time warnings. The cumulative effect of the deformation of large-span structures is significant, and local accuracy errors will seriously affect the overall stability and safety. To solve the above problems, the present invention provides a method for controlling the connection accuracy of large-span steel-wood composite structures.

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

[0005] A method for controlling the connection accuracy of large-span steel-wood composite structures in a large temperature and humidity difference environment, characterized in that the control method includes the following steps:

[0006] Step 1: Perform material pretreatment. Select laminated glulam and perform UV curing paint process coating treatment. Treat the surface of the steel insert member (1) with a hot-dip galvanized coating, randomly inspect the zinc layer thickness with a magnetic thickness gauge, prefabricate an EPDM rubber elastic gasket (10) and laser engrave diamond-shaped anti-slip textures on the surface;

[0007] Step 2: Precision machining of components. Machine a limit chute (6) at the end of the glued wood block (3), with the chute width 2 mm larger than the side wall of the groove of the steel insert (1) to form a sliding gap, and open a groove matching the limit chute (6) on the butt joint surface of the steel insert (1);

[0008] Step 3: Assembly of the telescopic strut system. Rigidly connect the telescopic strut (4) to the glued wooden block (3) through high-strength bolts. A guiding hole (9) is provided inside the strut. The telescopic amount of the strut (4) is calculated and set according to the deformation amount due to temperature and humidity. Lay an EPDM rubber elastic gasket (10) between the contact surfaces of the steel insertion plate (1) and the glued wooden block (3);

[0009] Step 4: Assembly of the composite interface layer. Stack them in the order of the steel insertion plate component (1) - elastic gasket (10) - glued wooden block (3). Calibrate the deviation of the axis of the limiting sliding groove (6) from the groove of the steel insertion plate component (1), and apply a temporary pressing force to complete the interface connection;

[0010] Step 5: Layout the prestressing system. Pass the prestressing cable (5) successively through the reserved holes of the steel insertion plate component (1), the through holes of the glued wooden block (3), and the guiding hole (9) of the strut (4). Install adjusting nuts (7) (with torque scales) and anchoring ends (8) at both ends of the prestressing cable (5);

[0011] Step 6: Apply the initial pre-tightening force through a torque wrench. According to the ambient temperature and humidity range, load it in stages to the designed pre-tightening force through the adjusting nut (7) to ensure uniform contact pressure between the glued wooden block (3) and the steel insertion plate (1). Monitor the telescopic amount of the strut (4) during the loading process to ensure that the sliding freedom of the limiting sliding groove (6) and the steel insertion plate groove is consistent with the designed direction;

[0012] Step 7: Deformation compensation calibration. Measure the slip amount of the glued wooden block (3) relative to the steel insertion plate component (1) for dynamic adjustment. Adjust the strut (4) so that the deviation of the slip direction from the theoretical direction is ≤5°, and finally lock the adjusting nut (7);

[0013] Step 8: Bond the end of the pre-treated glued wooden beam (2) to the glued wooden block (3) with epoxy structural adhesive, and form an integral structure after curing.

[0014] Furthermore, the steel insertion plate component (1) is used to connect to the external steel structure; the glued wooden beam (2) is arranged adjacent to the steel insertion plate component (1); the glued wooden block (3) is fixed at the end of the glued wooden beam (2); the strut (4) is rigidly connected to the glued wooden block (3); the prestressing cable (5) passes successively through the steel insertion plate component (1), the glued wooden block (3), and the strut (4); wherein, the glued wooden block (3) and the strut (4) form a composite sliding interface, and the prestressing cable (5) adjusts the contact pressure between the steel insertion plate component (1) and the glued wooden beam (2) through the pre-tightening force, and allows the glued wooden block (3) to generate micro-displacement compensation relative to the steel insertion plate component (1) along the direction of temperature and humidity change;

[0015] An elastic gasket (10) is provided between the steel plug-in member (1) and the glued wooden block (3), and the compression modulus of the elastic gasket (10) is less than that of the glued wooden block (3).

[0016] The contact surface of the steel plug-in member (1) is provided with an anti-corrosion coating, which is hot-dip galvanized with a zinc layer thickness of 50 μm. The surface of the glued wooden beam (2) is a UV-cured paint coating, and an EPDM rubber pad is used to isolate the steel-wood interface to avoid electrochemical corrosion.

[0017] Furthermore, the glued wooden blocks (3) and the struts (4) are arranged staggeredly and are slidably matched with the grooves of the steel plug-in member (1) through the limit sliding grooves (6), and the extension direction of the limit sliding grooves (6) is the same as the temperature and humidity deformation direction.

[0018] Furthermore, adjusting nuts (7) and anchoring ends (8) are provided at both ends of the prestressed cable (5), and the adjusting nuts (7) are used to dynamically adjust the prestress value to adapt to different environmental conditions.

[0019] Furthermore, the strut (4) is a telescopic member, and a guide hole (9) is provided inside it. The prestressed cable (5) passes through the internal guide hole (9) and allows the strut (4) to finely adjust its displacement axially.

[0020] Furthermore, the elastic gasket (10) is made of rubber or polyurethane, with a thickness of 2-5 mm, and its surface is provided with diamond-shaped anti-slip textures engraved by laser.

[0021] Furthermore, the axis of the prestressed cable (5) forms an angle of 5°-30° with the fiber direction of the glued wooden beam (2), and the surface of the cable body is coated with a low friction coefficient coating.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. Most existing steel-wood joints adopt rigid connection or fixed prestress design connection methods, which cannot offset the material expansion and contraction difference problems caused by temperature and humidity changes in real time. Through the dynamic adjustment of the prestressed cable and the synergistic effect of the composite sliding interface, micro-displacement compensation of the steel-wood interface is achieved, significantly reducing the connection precision error, which is significantly better than the ±5 mm deviation limit of traditional structures.

[0024] 2. Traditional joints rely on the anti-deformation ability of the material itself and are prone to stress concentration problems due to disordered sliding. By restricting the deformation path through the limit sliding groove, the interface slip is strictly released along the temperature and humidity deformation direction. At the same time, an elastic gasket is laid to buffer the local stress peak, which can reduce structural fatigue damage and significantly extend the joint life.

[0025] 3. Conventional steel-wood anti-corrosion coatings only focus on the protection of single materials and ignore interfacial electrochemical corrosion and frictional losses. By adopting the combination of glulam UV-cured paint coating and hot-dip galvanized steel coating, and supplementing with the anti-slip texture design of PTFE coating for low-friction coefficient prestressed cables and EPDM rubber elastic gaskets, the interfacial wear rate is reduced, and the anti-corrosion period is synchronously extended to more than 20 years.

[0026] 4. Most of the existing technologies are designed for specific environments and lack the ability of dynamic adjustment. Through the adjustable nuts of the prestressed cables and the axial fine-tuning structure of the struts, it supports the prestress calibration and deformation threshold setting in climate zones such as high humidity and coastal salt spray. The engineering applicability covers the temperature change range of -30°C to 60°C, and the climate adaptability is significantly extended.

[0027] 5. Traditional joints need to be frequently maintained to compensate for the accuracy loss caused by long-term use. However, through the integrated adaptive design, the need for manual intervention can be reduced. Combining the rapid painting process of glulam UV-cured paint coating and hot-dip galvanized steel can significantly improve the on-site construction efficiency and reduce the full-life cycle maintenance cost at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the flow chart of the present invention;

[0029] Figure 2 is the overall elevation schematic diagram of the structure of the present invention;

[0030] Figure 3 is the cross-sectional schematic diagram of the structure of the present invention;

[0031] In the figure: 1. Steel plug-in member; 2. Glulam beam member; 3. Glulam block; 4. Strut; 5. Prestressed cable; 6. Limit chute; 7. Adjusting nut; 8. Anchoring end; 9. Guide hole; 10. Elastic gasket. DETAILED DESCRIPTION OF THE 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 of 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 Figures 1-3 , the present invention provides a technical solution: a method for controlling the connection accuracy of a large-span steel-wood composite structure in a large temperature and humidity difference environment, including the following steps:

[0034] Step 1: Conduct material pretreatment. Select laminated veneer lumber for treatment with a UV-cured paint process coating. Treat the surface of the steel plug member 1 with a hot-dip galvanized coating, and randomly inspect the zinc layer thickness with a magnetic thickness gauge. Pre-fabricate the EPDM rubber elastic gasket 10 and laser engrave diamond-shaped anti-slip textures on its surface.

[0035] Step 2: Precision machining of components. Machine a limiting sliding groove 6 at the end of the glued wood block 3, with the groove width 2 mm larger than the side wall of the groove of the steel plug 1 to form a sliding gap, and open a groove matching the limiting sliding groove 6 on the butt joint surface of the steel plug 1.

[0036] Step 3: Assembly of the telescopic strut system. Rigidly connect the telescopic strut 4 to the glued wood block 3 with high-strength bolts, set a guiding hole 9 inside the strut, set the telescopic amount of the strut 4 according to the calculated deformation amount due to temperature and humidity, and lay the EPDM rubber elastic gasket 10 between the contact surfaces of the steel plug 1 and the glued wood block 3.

[0037] Step 4: Assembly of the composite interface layer. Stack them in the order of the steel plug member 1 - elastic gasket 10 - glued wood block 3, calibrate the axis deviation between the limiting sliding groove 6 and the groove of the steel plug member 1, and apply a temporary pressing force to complete the interface connection.

[0038] Step 5: Layout the prestressing system. Pass the prestressing cable 5 successively through the reserved holes of the steel plug member 1, the through holes of the glued wood block 3, and the guiding hole 9 of the strut 4, and install adjusting nuts 7 with torque scales and anchoring ends 8 at both ends of the prestressing cable 5.

[0039] Step 6: Apply the initial pre-tightening force with a torque wrench. According to the ambient temperature and humidity range, load it in stages to the designed pre-tightening force through the adjusting nut 7 to ensure uniform contact pressure between the glued wood block 3 and the steel plug 1. Monitor the telescopic amount of the strut 4 during the loading process to ensure that the sliding freedom degree between the limiting sliding groove 6 and the steel plug groove is consistent with the designed direction.

[0040] Step 7: Deformation compensation calibration. Measure the slip amount of the glued wood block 3 relative to the steel plug member 1 for dynamic adjustment, adjust the strut 4 so that the deviation of the slip direction from the theoretical direction is ≤5°, and finally lock the adjusting nut 7.

[0041] Step 8: Bond the end of the pretreated glued wood beam 2 to the glued wood block 3 with epoxy structural adhesive, and form an integral structure after curing.

[0042] Steel insertion plate member 1, used to connect external steel structures; Glulam beam 2, arranged adjacent to the steel insertion plate member 1; Glulam block 3, fixed at the end of the glulam beam 2; Strut 4, rigidly connected to the glulam block 3; Prestressing cable 5, passing through the steel insertion plate member 1, glulam block 3 and strut 4 in sequence; wherein, the glulam block 3 and the strut 4 form a composite sliding interface, and the prestressing cable 5 adjusts the contact pressure between the steel insertion plate member 1 and the glulam beam 2 through a pre-tightening force and allows the glulam block 3 to generate a micro-displacement compensation relative to the steel insertion plate member 1 along the direction of temperature and humidity change.

[0043] The glulam blocks 3 and the struts 4 are arranged in an alternating pattern and are in sliding fit with the grooves of the steel insertion plate member 1 through the limit sliding grooves 6, and the extension direction of the limit sliding grooves 6 is the same as the direction of temperature and humidity deformation.

[0044] Adjusting nuts 7 and anchoring ends 8 are provided at both ends of the prestressing cable 5, and the adjusting nut 7 is used to dynamically adjust the prestress value to adapt to different environmental conditions.

[0045] The strut 4 is a telescopic member, and a guiding hole 9 is provided inside it, and the prestressing cable 5 passes through the guiding hole 9 and allows the strut 4 to finely adjust its displacement along the axial direction.

[0046] An elastic gasket 10 is provided between the steel insertion plate member 1 and the glulam block 3, and the compression modulus of the elastic gasket 10 is less than that of the glulam block 3.

[0047] The elastic gasket 10 is made of EPDM rubber, with a thickness of 2 - 5 mm, isolating the steel-wood interface, and having anti-slip textures on its surface.

[0048] The axis of the prestressing cable 5 forms an angle of 5° - 30° with the fiber direction of the glulam beam 2, and the surface of the cable body is coated with a PTFE coating with a low friction coefficient.

[0049] The contact surface of the steel insertion plate member 1 is provided with an anti-corrosion coating, the anti-corrosion coating is hot-dip galvanized, with a zinc layer thickness of 50 μm, and the surface of the glulam beam 2 is a UV-cured paint coating.

[0050] In the construction of long-span structures, steel-wood composite structures need to overcome the problem of mismatched shrinkage rates caused by temperature and humidity differences between steel and wood. It is necessary to solve the problems that the deformation compensation amount of traditional joints is insufficient to cover the cumulative deformation of long-span structures, resulting in stress concentration or structural cracking, and that conventional galvanized steel parts undergo electrochemical corrosion and wood absorbs moisture and expands in humid environments, leading to reduced durability. Through innovative technologies such as dynamic prestress compensation, directional control of composite sliding interfaces, synergistic anti-corrosion and wear-resistant protection, and optimization of prefabrication processes, the present invention can effectively solve the connection problems of steel-wood composite structures in environments with large temperature and humidity differences. Its comprehensive advantages of high precision, long life, strong adaptability, and low cost provide a reliable solution for long-span buildings, coastal facilities, and climate-sensitive projects.

[0051] It should be noted that in this article, 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 "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so 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 also includes elements inherent to such process, method, article or device.

[0052] 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 connection accuracy control method for large-span steel-wood composite structures in an environment with a large temperature and humidity difference, characterized in that: The control method includes the following steps: Step 1: Conduct material pretreatment. Select laminated veneer lumber for treatment with a UV-cured paint process coating. Treat the surface of the steel plug member (1) with a hot-dip galvanized coating. Randomly check the zinc layer thickness with a magnetic thickness gauge. Prefabricate the EPDM rubber elastic gasket (10) and laser engrave diamond-shaped anti-slip textures on its surface. Step 2: Precision machining of the components. Machine a limit chute (6) at the end of the glued wooden block (3). The chute width is 2 mm larger than the side wall of the groove of the steel plug (1) to form a sliding gap. Open a groove matching the limit chute (6) on the butt joint surface of the steel plug (1). Step 3: Assembly of the telescopic strut system. Rigidly connect the telescopic strut (4) to the glued wooden block (3) with high-strength bolts. A guide hole (9) is provided inside the strut. The telescopic amount of the strut (4) is calculated and set according to the deformation amount due to temperature and humidity. Lay the EPDM rubber elastic gasket (10) between the contact surfaces of the steel plug (1) and the glued wooden block (3). Step 4: Assembly of the composite interface layer. Stack them in the order of the steel plug member (1) - elastic gasket (10) - glued wooden block (3). Calibrate the axis deviation between the limit chute (6) and the groove of the steel plug member (1), and apply a temporary pressing force to complete the interface connection. Step 5: Layout the prestressing system. Pass the prestressing cable (5) through the reserved hole of the steel plug member (1), the through hole of the glued wooden block (3), and the guide hole (9) of the strut (4) in sequence. Install adjusting nuts (7) (with torque scales) and anchoring ends (8) at both ends of the prestressing cable (5). Step 6: Apply an initial pre-tightening force with a torque wrench. According to the ambient temperature and humidity range, load it in stages to the designed pre-tightening force through the adjusting nut (7) to ensure uniform contact pressure between the glued wooden block (3) and the steel plug (1). Monitor the telescopic amount of the strut (4) during the loading process to ensure that the sliding freedom degree of the limit chute (6) and the steel plug groove is consistent with the designed direction. Step 7: Deformation compensation calibration. Measure the slip amount of the glued wooden block (3) relative to the steel plug member (1) for dynamic adjustment. Adjust the strut (4) so that the deviation of the slip direction from the theoretical direction is ≤ 5°, and finally lock the adjusting nut (7). Step 8: Bond the end of the pretreated glued wooden beam (2) to the glued wooden block (3) with epoxy structural adhesive, and form an integral structure after curing.

2. A connection accuracy control method for a large-span steel-wood composite structure in a large temperature and humidity difference environment according to claim 1, characterized in that: The steel plug member (1) is used to connect the external steel structure; the glued wooden beam (2) is arranged adjacent to the steel plug member (1); the glued wooden block (3) is fixed at the end of the glued wooden beam (2); the strut (4) is rigidly connected to the glued wooden block (3); the prestressing cable (5) passes through the steel plug member (1), the glued wooden block (3), and the strut (4) in sequence; wherein, the glued wooden block (3) and the strut (4) form a composite sliding interface, and the prestressing cable (5) adjusts the contact pressure between the steel plug member (1) and the glued wooden beam (2) through the pre-tightening force and allows the glued wooden block (3) to generate micro-displacement compensation relative to the steel plug member (1) along the direction of temperature and humidity change. An elastic gasket (10) is provided between the steel plug-in member (1) and the glued wooden block (3), and the compression modulus of the elastic gasket (10) is less than that of the glued wooden block (3). The contact surface of the steel plug-in member (1) is provided with an anti-corrosion coating, which is hot-dip galvanized with a zinc layer thickness of 50 μm. The surface of the glued wooden beam (2) is coated with a UV-cured paint, and an EPDM rubber pad is used to isolate the steel-wood interface to avoid electrochemical corrosion.

3. The method for controlling the connection accuracy of a long-span steel-wood composite structure in a large temperature and humidity difference environment according to claim 1, wherein The glued wooden blocks (3) and the struts (4) are arranged in a staggered manner and are slidably matched with the grooves of the steel plug-in member (1) through the limit sliding grooves (6). The extending direction of the limit sliding grooves (6) is the same as the direction of temperature and humidity deformation.

4. The connection accuracy control method for large-span steel-wood composite structures in a large temperature and humidity difference environment according to claim 1, characterized in that Adjusting nuts (7) and anchoring ends (8) are provided at both ends of the prestressing cable (5), and the adjusting nuts (7) are used to dynamically adjust the prestress value to adapt to different environmental conditions.

5. The connection precision control method for large-span steel-wood composite structures in a large temperature and humidity difference environment according to claim 1, wherein The strut (4) is a telescopic member, and a guide hole (9) is provided inside it. The prestressing cable (5) passes through the internal guide hole (9) and allows the strut (4) to finely adjust its displacement axially.

6. The method for controlling the connection accuracy of a large-span steel-wood composite structure in a large temperature and humidity difference environment according to claim 1, characterized in that The elastic gasket (10) is made of rubber or polyurethane, with a thickness of 2-5 mm, and its surface is provided with diamond-shaped anti-slip textures engraved by laser.

7. The method for controlling the connection accuracy of a long-span steel-wood composite structure in a large temperature and humidity difference environment according to claim 1, characterized in that The axis of the prestressing cable (5) forms an angle of 5°-30° with the fiber direction of the glued wooden beam (2), and the surface of the cable body is coated with a low friction coefficient coating.

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