Anti-disturbance steel pipe truss prestressed composite slab and construction process

Abstract

The application relates to the technical field of prestressed composite slabs, and discloses an anti-disturbance steel pipe truss prestressed composite slab and a construction process, wherein the composite slab comprises longitudinal beams, the outer walls of the longitudinal beams are provided with cross beams, the top of each cross beam is provided with a steel reinforcement cage, the outer wall of each longitudinal beam is provided with a composite slab assembly, and the top of each cross beam is provided with an adjusting assembly. The anti-disturbance steel pipe truss prestressed composite slab and the construction process are characterized in that an upper chord pipe is arranged, a vibration-proof grouting column is poured into the upper chord pipe, the upper chord pipe and the vibration-proof grouting column form a composite cross-section structure of a rigid framework plus dense grouting material, when low-frequency vibration is generated during subway driving, vibration energy is transmitted to the upper chord pipe, rubber particles absorb vibration energy by compression and rebound deformation, the stability of the composite slab body in the vibration construction environment is improved, and concrete is poured in batches, so that the stress burden of a single pouring layer is greatly reduced, and layer displacement and cracks caused by vibration are reduced.

Description

Technical Field

[0001] This invention relates to the field of prestressed composite slab technology, specifically to an anti-disturbance steel pipe truss prestressed composite slab and its construction process. Background Technology

[0002] Truss prestressed composite slabs are a new type of prefabricated monolithic floor slab that combines factory prefabrication with on-site casting. The core of this design is the integration of a dual load-bearing system of "prestressed tendons + steel pipe trusses" into the prefabricated base slab, followed by on-site hoisting and pouring of the upper layer of concrete to form a monolithic structure. Its design balances the advantages of prestressed structures (high span, low deflection) with the strong load-bearing capacity and anti-disturbance capabilities of truss structures, making it particularly suitable for the architectural needs of large-span spaces. It is a technologically mature and widely used floor slab form in prefabricated construction.

[0003] When traditional prestressed composite slabs are used, during the construction of buildings on top of subway protection zones, the vibrations generated by subway operation cause structural vibrations and settlement. The rigid design and construction process of traditional composite slabs are easily affected by vibrations, leading to cracking. Once the composite slab tilts or cracks, it will affect the subsequent pouring of concrete on top of the composite slab, thus affecting the construction of the building. Summary of the Invention

[0004] This invention provides a disturbance-resistant prestressed composite slab for steel pipe trusses and its construction process, which solves the problems mentioned in the background art.

[0005] The present invention provides the following technical solution: a disturbance-resistant steel pipe truss prestressed composite slab, comprising a longitudinal beam, a transverse beam installed on the outer wall of the longitudinal beam, a reinforcing cage installed on the top of the transverse beam, a composite slab assembly provided on the outer wall of the longitudinal beam, and an adjustment assembly provided on the top of the transverse beam;

[0006] The composite plate assembly includes a composite plate body, a connecting rib is fixedly assembled in the inner cavity of the composite plate body, an upper chord tube is fixedly assembled on the top of the composite plate body, and a web member is installed on the outer wall of the upper chord tube.

[0007] The top of the composite plate body is equipped with a first L-shaped limiting plate, the top of the first L-shaped limiting plate is equipped with a locking bolt, and the outer wall of the first L-shaped limiting plate is fixedly fitted with an elastic buffer block. The top of the longitudinal beam is fixedly fitted with a second L-shaped limiting plate, and the top of the second L-shaped limiting plate is equipped with a fixing bolt.

[0008] As a preferred technical solution of the present invention: the inner cavity of the upper chord tube is filled with anti-vibration grouting column, and the anti-vibration grouting column is anti-vibration grouting material mixed with rubber particles; the elastic buffer block is elastic sealant; and the installation position of the first L-shaped limiting plate corresponds to the installation position of the second L-shaped limiting plate.

[0009] As a preferred embodiment of the present invention: the connecting bar enters the inner cavity of the steel cage, and the bottom of the web member is connected to the top of the composite slab body.

[0010] As a preferred technical solution of the present invention: the outer diameter of the upper chord tube is 30 mm, and the upper chord tube is a thick-walled corrugated pipe with a thickness of 1.5 mm; the composite plate body is a steel-concrete structure; and the connecting rib penetrates the inner cavity of the composite plate body.

[0011] As a preferred technical solution of the present invention: the inner cavity of the upper chord tube is filled with a vibration-damping grout column, and the vibration-damping grout column is a vibration-damping grout mixed with rubber particles, and the material ratio of the vibration-damping grout mixed with rubber particles is 70 parts cement, 580 parts rubber particles, and 350 parts other materials. The elastic buffer block is an elastic sealant. The installation position of the first L-shaped limiting plate corresponds to the installation position of the second L-shaped limiting plate.

[0012] As a preferred embodiment of the present invention: the adjustment assembly includes a mounting base, a support plate is fixedly mounted on the outer wall of the mounting base, a support cylinder is mounted on the top of the crossbeam, a butterfly spring is installed in the inner cavity of the support cylinder, a viscous damper is installed in the inner cavity of the support cylinder, a guide screw is fixedly mounted on the top of the viscous damper, a limit nut is threadedly connected to the outer wall of the guide screw, and a locking nut is threadedly connected to the outer wall of the guide screw.

[0013] As a preferred embodiment of the present invention: the butterfly spring is made of stainless steel, the support plate is movably sleeved on the outer wall of the guide screw, and the two sides of the outer wall of the support plate are in contact with the bottom of the limiting nut and the top of the locking nut, respectively.

[0014] As a preferred embodiment of the present invention: the inner diameter of the support plate matches the outer diameter of the guide screw, and the bottom of the viscous damper is connected to the top of the disc spring.

[0015] A construction process for a disturbance-resistant prestressed composite slab using steel pipe trusses includes the following steps:

[0016] S1: When constructing the composite slab body, anti-vibration grouting columns are injected into the inner cavity of the upper chord tube, so that the inner cavity of the upper chord tube is filled with anti-vibration grouting columns. The composite slab body is then erected on top of the longitudinal beams and transverse beams, and the composite slab bodies on both sides enter the inner cavity of the reinforcing cage. The support cylinder is placed on top of the transverse beam. The position of the support plate is adjusted by rotating the locking nut and the limit nut. Then the mounting base can be installed on the outer wall of the composite slab body.

[0017] S2: Then, use locking bolts to fix the No. 1 L-shaped limiting plate, so that the No. 1 L-shaped limiting plate is installed on the outer wall of the composite plate body, and use fixing bolts to install and fix the No. 2 L-shaped limiting plate, so that the bottom of the No. 2 L-shaped limiting plate is installed on the top of the longitudinal beam. Inject elastic sealant between the No. 1 L-shaped limiting plate and the No. 2 L-shaped limiting plate. After it cures, it forms an elastic buffer block. At this time, under the action of the elastic buffer block, the No. 1 L-shaped limiting plate and the No. 2 L-shaped limiting plate can be connected.

[0018] S3: Subsequently, during the operation of the subway, when the vibration caused by the subway caused the composite slab body to shift horizontally, the No. 2 L-shaped limiting plate and the No. 1 L-shaped limiting plate can rigidly limit the horizontal shift of the composite slab body and compress or stretch the elastic buffer block, so that the composite slab body is restricted between the No. 1 L-shaped limiting plate and the No. 2 L-shaped limiting plate. After the vibration subsides, the position between the No. 1 L-shaped limiting plate and the No. 2 L-shaped limiting plate can be reset under the action of the elastic buffer block, so as to better support the composite slab body.

[0019] S4: During subway operation, when vibration causes vertical movement, the composite slab body will synchronously drive the mounting base and support plate to float. Since the support plate is locked to the outer wall of the guide screw, it drives the guide screw and viscous damper to move up and down. When moving downward, it will compress the butterfly spring, thereby absorbing energy and alleviating the displacement caused by vibration during the compression process of the butterfly spring. Then, when moving upward, the butterfly spring rebounds upward, and the viscous damping fluid in the viscous damper will generate viscous resistance, dissipating the vibration energy released by the rebound of the butterfly spring, avoiding repeated transmission of vibration, effectively weakening the impact of low-frequency subway vibration on the composite slab, avoiding structural fatigue cracking, and further alleviating the vibration energy. Once the composite slab body shows significant settlement, the position of the support plate on the outer wall of the guide screw can be adjusted by adjusting the position of the locking nut and the limit nut, so that the composite slab body is in a horizontal state, which facilitates subsequent concrete pouring.

[0020] S5: When pouring concrete for the top layer of the composite slab body, first pour 40 mm of concrete onto the top of the composite slab body, and after an interval of 24 hours, pour another 45 mm of concrete. This further reduces cracks caused by vibration. Pouring in two stages can significantly reduce the stress on each layer. After 24 hours of curing, the first 40 mm of concrete can form a base layer with a certain strength, which supports the second concrete pour and reduces interlayer slippage and cracks caused by vibration.

[0021] The present invention has the following beneficial effects:

[0022] 1. The anti-disturbance steel pipe truss prestressed composite slab and its construction technology, through the setting of the upper chord tube and the injection of anti-vibration grouting columns into the inner cavity of the upper chord tube, further improves the overall strength and damping ratio of the composite slab body under the action of the upper chord tube and the anti-vibration grouting columns. This makes the upper chord tube and the anti-vibration grouting columns form a composite cross-section structure with a rigid skeleton and dense filling of grout. When the subway generates low-frequency vibration, the vibration energy is transmitted to the upper chord tube. The rubber particles will absorb the vibration energy through their own compression and rebound deformation. At the same time, the interface friction between the grout matrix and the rubber particles will also dissipate some energy, improving the stability of the composite slab body in the vibration construction environment. Furthermore, the concrete is poured in batches, and the two-stage pouring can significantly reduce the stress burden of a single pouring layer, further reducing interlayer slippage and cracks caused by vibration.

[0023] 2. The anti-disturbance steel pipe truss prestressed composite slab and its construction technology utilize a No. 1 L-shaped limiting plate installed on the outer wall of the composite slab body and a No. 2 L-shaped limiting plate installed on the top of the longitudinal beam. The No. 1 and No. 2 L-shaped limiting plates rigidly restrict the horizontal movement of the composite slab body and restore the horizontal displacement under the action of the elastic buffer block. The butterfly spring installed in the inner cavity of the support tube and the viscous damper installed on the top of the butterfly spring can compress the butterfly spring when the composite slab body floats up and down. Thus, the vertical vibration is dissipated under the action of the butterfly spring and the viscous damper, preventing the composite slab body from floating up and down. After the composite slab body settles, the position of the composite slab body can be adjusted appropriately by adjusting the position of the limiting nut and the locking nut. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the longitudinal beam structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the beam structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the composite plate body structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the upper chord tube structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the L-shaped limiting plate structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the elastic buffer block structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the support cylinder structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the support plate structure of the present invention.

[0033] In the diagram: 1. Longitudinal beam; 2. Cross beam; 3. Reinforcing cage; 4. Composite slab assembly; 5. Adjustment assembly;

[0034] 401. Composite slab body; 402. Connecting rib; 403. Top chord tube; 404. Web member; 405. Vibration-damping grouting column; 406. No. 1 L-shaped limiting plate; 407. Locking bolt; 408. No. 2 L-shaped limiting plate; 409. Elastic buffer block; 4010. Fixing bolt;

[0035] 501. Mounting base; 502. Support plate; 503. Support cylinder; 504. Butterfly spring; 505. Viscous damper; 506. Guide screw; 507. Limit nut; 508. Locking nut. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1-9 An anti-disturbance steel pipe truss prestressed composite slab includes a longitudinal beam 1, a transverse beam 2 installed on the outer wall of the longitudinal beam 1, a steel cage 3 installed on the top of the transverse beam 2, a composite slab assembly 4 provided on the outer wall of the longitudinal beam 1, and an adjustment assembly 5 provided on the top of the transverse beam 2.

[0038] The composite plate assembly 4 includes a composite plate body 401, a connecting rib 402 fixedly assembled in the inner cavity of the composite plate body 401, an upper chord tube 403 fixedly assembled on the top of the composite plate body 401, and a web member 404 installed on the outer wall of the upper chord tube 403.

[0039] The top of the composite plate body 401 is equipped with a first L-shaped limiting plate 406, the top of the first L-shaped limiting plate 406 is equipped with a locking bolt 407, the outer wall of the first L-shaped limiting plate 406 is fixedly fitted with an elastic buffer block 409, the top of the longitudinal beam 1 is fixedly fitted with a second L-shaped limiting plate 408, and the top of the second L-shaped limiting plate 408 is equipped with a fixing bolt 4010.

[0040] In the above structure, by setting the steel cage 3 on the top of the crossbeam 2, after the composite slab body 401 is erected on the top of the longitudinal beam 1 and the crossbeam 2, when it is necessary to pour concrete on the top of the composite slab body 401, the connecting bar 402 is connected to the steel cage 3 to enhance its overall strength and better support the composite slab body 401, thereby better pouring concrete on the top of the composite slab body 401.

[0041] Furthermore, an efficient truss force-bearing system is formed by an upper chord tube 403 installed at the top of the composite slab body 401, where the upper chord tube 403 is under compression and the web members 404 transmit shear force. The prestressed tendons also generate prestress in the tension zone of the precast base slab, offsetting the tensile stress caused by construction loads, preventing cracking of the base slab, and avoiding deformation of the precast base slab due to excessive local loads. This system also bears the pressure of the concrete subsequently poured on top of the composite slab body 401, as well as the floor live load and construction stage loads during the service phase. The temporary load of the section ensures the stable erection of the composite slab body 401. The web members 404 installed on the outer wall of the upper chord tube 403 form a triangular stable structure with the upper chord tube 403 under the action of the web members 404. The vibration damping grouting column 405 is injected into the inner cavity of the upper chord tube 403, so that the vibration damping grouting column 405, the upper chord tube 403, and the web members 404 form a composite system of rigid skeleton and damping filling, which can actively absorb the vibration energy of the subway and reduce the impact of vibration on the composite slab body 401.

[0042] Furthermore, the first L-shaped limiting plate 406 installed on the outer wall of the composite slab body 401 and the second L-shaped limiting plate 408 installed on the top of the longitudinal beam 1 form a lateral restriction on the composite slab body 401 under the action of the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408. The elastic buffer block 409 installed between the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408 provides a buffering effect, preventing the lateral displacement tendency of the composite slab body 401 from being blocked by the second L-shaped limiting plate 408 and the first L-shaped limiting plate 408. The limiting plate 406 directly blocks and prevents the composite plate body 401 from being misaligned. When horizontal vibration is transmitted to the composite plate, part of the vibration energy is first absorbed by the compression deformation of the elastic buffer block 409. Then, the rigid structure of the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408 blocks the remaining displacement. Even after the vibration causes the composite plate body 401 to shift, the second L-shaped limiting plate 408 and the first L-shaped limiting plate 406 can be reset under the action of the elastic buffer block 409 after the vibration dissipates, thereby preventing the vibration from causing excessive displacement of the composite plate body 401.

[0043] In a preferred embodiment: the connecting bar 402 enters the inner cavity of the steel cage 3, and the bottom of the web member 404 is connected to the top of the composite plate body 401.

[0044] In the above structure, the upper chord tube 403 and the web member 404 are provided in the inner cavity and top of the composite slab body 401. Under the action of the web member 404 and the upper chord tube 403, a triangular stable structure is formed, thereby improving the overall load-bearing capacity of the composite slab body 401. This ensures the stability of the concrete pouring under the action of the composite slab body 401 when concrete is poured to the top of the composite slab body 401. During the concrete pouring, the upper chord tube 403 is tied to the steel cage 3 to form a reinforced concrete structure.

[0045] In a preferred embodiment: the outer diameter of the upper chord tube 403 is 30 mm, and the upper chord tube 403 is a thick-walled corrugated tube with a thickness of 1.5 mm. The composite plate body 401 is a steel-concrete structure, and the connecting rib 402 penetrates the inner cavity of the composite plate body 401.

[0046] In the above structure, the connecting bars 402 set in the inner cavity of the composite slab body 401, and during the subsequent pouring of concrete, can make the steel cage 3, the connecting bars 402, the upper chord tube 403, and the web members 404 form an integral steel-concrete structure, so that the composite slab body 401, the subsequent concrete, and the building frame form an integral whole, which can disperse the concentrated stress to the entire frame formed by the upper chord tube 403, the web members 404, and the connecting bars 402, and avoid local concrete cracking.

[0047] In a preferred embodiment: the inner cavity of the upper chord tube 403 is filled with a vibration damping grout column 405, and the vibration damping grout column 405 is a vibration damping grout mixed with rubber particles, and the material ratio of the vibration damping grout mixed with rubber particles is 70 parts cement, 580 parts rubber particles, and 350 parts other materials. The elastic buffer block 409 is an elastic sealant. The installation position of the first L-shaped limiting plate 406 corresponds to the installation position of the second L-shaped limiting plate 408.

[0048] Table 1:

[0049] ;

[0050] In the above structure, according to Table 1 above, under the condition that the cement and other proportions remain unchanged, the performance indicators achieved by the rubber particles are achieved by filling the inner cavity of the upper chord tube 403 with the anti-vibration grouting column 405. After the anti-vibration grouting column 405 is filled, the upper chord tube 403 and the anti-vibration grouting column 405 will form a composite cross-section structure with a rigid skeleton and dense filling of grouting material. It can effectively bear the self-weight of the composite slab body 401, the load of the post-cast layer and the temporary construction load, and avoid the upper chord tube 403 from bending and instability deformation under the load. Moreover, the anti-vibration grouting column 405 has high elasticity and energy dissipation characteristics. When the subway generates low-frequency vibration, the vibration energy is transmitted to the upper chord tube 403. The rubber particles will absorb the vibration energy through their own compression and rebound deformation. At the same time, the interface friction between the grouting material matrix and the rubber particles will also dissipate some energy, thereby improving the overall damping ratio of the upper chord tube 403 and the web member 404.

[0051] In a preferred embodiment: the adjusting assembly 5 includes a mounting base 501, a support plate 502 is fixedly mounted on the outer wall of the mounting base 501, a support cylinder 503 is mounted on the top of the crossbeam 2, a butterfly spring 504 is installed in the inner cavity of the support cylinder 503, a viscous damper 505 is installed in the inner cavity of the support cylinder 503, a guide screw 506 is fixedly mounted on the top of the viscous damper 505, a limit nut 507 is threadedly connected to the outer wall of the guide screw 506, and a locking nut 508 is threadedly connected to the outer wall of the guide screw 506.

[0052] In the above structure, by setting the mounting base 501 on the outer wall of the composite slab body 401, when the vibration generated by the subway operation is transmitted upward to the composite slab body 401, the mounting base 501 will drive the support plate 502 to push the viscous damper 505 to move up and down. During the compression and deformation of the viscous damper 505 and the disc spring 504, the vibration energy of the subway is absorbed, thereby preventing the vibration generated by the subway from acting on the composite slab body 401 and causing it to deviate significantly. If the composite slab body 401 settles under the action of vibration, the support plate 502 can be unlocked by rotating the locking nut 508 and the limit nut 507. Then, the position of the support plate 502 on the outer wall of the guide screw 506 is adjusted appropriately to resist the influence of settlement, so that the composite slab body 401 is erected more stably.

[0053] In a preferred embodiment: the butterfly spring 504 is made of stainless steel, the support plate 502 is movably sleeved on the outer wall of the guide screw 506, and the two sides of the outer wall of the support plate 502 are in contact with the bottom of the limit nut 507 and the top of the locking nut 508, respectively.

[0054] In the above structure, the butterfly spring 504 installed in the inner cavity of the support plate 502 can quickly compress and deform to absorb the impact energy when the subway train passes by and causes a vertical instantaneous impact, thus preventing the vibration from being directly transmitted to the composite slab body 401. When the butterfly spring 504 rebounds, the viscous damping fluid in the viscous damper 505 will generate viscous resistance, dissipating the vibration energy released by the rebound of the butterfly spring 504, preventing the vibration from being repeatedly transmitted, effectively weakening the impact of the subway's low-frequency vibration on the composite slab, avoiding structural fatigue cracking, and when the composite slab body 401 shows obvious settlement, the position of the support plate 502 on the outer wall of the guide screw 506 can be adjusted by adjusting the position of the locking nut 508 and the limit nut 507, so that the composite slab body 401 is in a horizontal state, which facilitates subsequent concrete pouring.

[0055] In a preferred embodiment: the inner diameter of the support plate 502 matches the outer diameter of the guide screw 506, and the bottom of the viscous damper 505 is connected to the top of the disc spring 504.

[0056] In the above structure, by using the guide screw 506 set on the top of the viscous damper 505, when the vibration of the subway operation causes the composite slab body 401 to sink or tilt, the position of the support plate 502 can be adjusted by loosening the limit nut 507 and the locking nut 508 respectively, so as to raise or lower the position of the support plate 502, thereby achieving precise compensation for the settlement and avoiding uneven stress, crack expansion or loosening of the joints in the composite slab body 401 due to settlement. Under the combined action of the butterfly spring 504 and the guide screw 506, the butterfly spring 504 temporarily buffers the sinking trend through elastic deformation. Subsequently, the guide screw 506, the locking nut 508 and the limit nut 507 are used for precise calibration to lock the compensation height and ensure that the composite slab body 401 is in a stable horizontal state for a long time.

[0057] A construction process for a disturbance-resistant prestressed composite slab using steel pipe trusses includes the following steps:

[0058] S1: When constructing the composite slab body 401, anti-vibration grouting columns 405 are injected into the inner cavity of the upper chord pipe 403, so that the inner cavity of the upper chord pipe 403 is filled with anti-vibration grouting columns 405. The composite slab body 401 is then erected on the top of the longitudinal beam 1 and the transverse beam 2, and the composite slab bodies 401 on both sides enter the inner cavity of the reinforcing cage 3. The support cylinder 503 is placed on the top of the transverse beam 2. The position of the support plate 502 is adjusted by rotating the locking nut 508 and the limiting nut 507. Then, the mounting base 501 can be installed on the outer wall of the composite slab body 401.

[0059] S2: Then, use locking bolts 407 to fix the first L-shaped limiting plate 406, so that the first L-shaped limiting plate 406 is installed on the outer wall of the composite plate body 401, and use fixing bolts 4010 to install and fix the second L-shaped limiting plate 408, so that the bottom of the second L-shaped limiting plate 408 is installed on the top of the longitudinal beam 1. Inject elastic sealant between the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408, and after it cures, it forms an elastic buffer block 409. At this time, under the action of the elastic buffer block 409, the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408 can be connected.

[0060] S3: Subsequently, during the operation of the subway, when the vibration caused by it caused the composite slab body 401 to shift horizontally, the second L-shaped limiting plate 408 and the first L-shaped limiting plate 406 can rigidly limit the horizontal shift of the composite slab body 401 and compress or stretch the elastic buffer block 409, so that the composite slab body 401 is restricted between the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408. After the vibration subsides, the elastic buffer block 409 can reset the position between the first L-shaped limiting plate 406 and the second L-shaped limiting plate 408, thus better supporting the composite slab body 401.

[0061] S4: During subway operation, when vibration causes vertical movement, the composite plate body 401 will synchronously drive the mounting base 501 and the support plate 502 to float. Since the support plate 502 is locked to the outer wall of the guide screw 506, it drives the guide screw 506 and the viscous damper 505 to move up and down. When moving downward, it will compress the disc spring 504, thereby absorbing energy and mitigating the displacement caused by vibration during the compression of the disc spring 504. Then, when moving upward, the disc spring 504 will rebound upward, synchronously viscous damping... The viscous damping fluid inside the damper 505 generates viscous resistance, dissipating the vibration energy released by the rebound of the butterfly spring 504, avoiding repeated transmission of vibration, effectively weakening the impact of low-frequency vibration of the subway on the composite slab, avoiding structural fatigue cracking, and further mitigating the energy of vibration. Once the composite slab body 401 shows significant settlement, the position of the support plate 502 on the outer wall of the guide screw 506 can be adjusted by adjusting the position of the locking nut 508 and the limit nut 507, so that the composite slab body 401 is in a horizontal state, which facilitates subsequent concrete pouring.

[0062] S5: When pouring concrete for the top layer of the composite slab body 401, first pour 40 mm of concrete onto the top of the composite slab body 401, and after an interval of 24 hours, pour another 45 mm of concrete. This further reduces cracks caused by vibration. Pouring in two stages can significantly reduce the stress on a single pouring layer. After 24 hours of curing, the first 40 mm of concrete can form a base layer with a certain strength, which supports the second pouring concrete and reduces interlayer slippage and cracks caused by vibration.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A disturbance-resistant steel pipe truss prestressed composite slab, comprising longitudinal beams (1), characterized in that: A crossbeam (2) is installed on the outer wall of the longitudinal beam (1), a steel cage (3) is installed on the top of the crossbeam (2), a composite plate assembly (4) is provided on the outer wall of the longitudinal beam (1), and an adjustment assembly (5) is provided on the top of the crossbeam (2). The composite plate assembly (4) includes a composite plate body (401), a connecting rib (402) is fixedly assembled in the inner cavity of the composite plate body (401), an upper chord tube (403) is fixedly assembled on the top of the composite plate body (401), and a web member (404) is installed on the outer wall of the upper chord tube (403). The top of the composite plate body (401) is equipped with a first L-shaped limiting plate (406), the top of the first L-shaped limiting plate (406) is equipped with a locking bolt (407), the outer wall of the first L-shaped limiting plate (406) is fixedly fitted with an elastic buffer block (409), the top of the longitudinal beam (1) is fixedly fitted with a second L-shaped limiting plate (408), the outer walls on both sides of the elastic buffer block (409) abut against the first L-shaped limiting plate (406) and the second L-shaped limiting plate (408) respectively, and the top of the second L-shaped limiting plate (408) is equipped with a fixing bolt (4010). The adjustment assembly (5) includes a mounting base (501), a support plate (502) is fixedly mounted on the outer wall of the mounting base (501), a support cylinder (503) is mounted on the top of the crossbeam (2), a butterfly spring (504) is installed in the inner cavity of the support cylinder (503), a viscous damper (505) is installed in the inner cavity of the support cylinder (503), a guide screw (506) is fixedly mounted on the top of the viscous damper (505), a limit nut (507) is threadedly connected to the outer wall of the guide screw (506), and a locking nut (508) is threadedly connected to the outer wall of the guide screw (506).

2. The anti-disturbance steel pipe truss prestressed composite slab according to claim 1, characterized in that: The connecting bar (402) enters the inner cavity of the steel cage (3), and the bottom of the web bar (404) is connected to the top of the composite plate body (401).

3. The anti-disturbance steel pipe truss prestressed composite slab according to claim 2, characterized in that: The outer diameter of the upper chord tube (403) is 30 mm, and the upper chord tube (403) is a thick-walled corrugated tube with a thickness of 1.5 mm. The composite plate body (401) is a steel-concrete structure, and the connecting rib (402) penetrates the inner cavity of the composite plate body (401).

4. The anti-disturbance steel pipe truss prestressed composite slab according to claim 3, characterized in that: The inner cavity of the upper chord tube (403) is filled with anti-vibration grouting column (405), and the anti-vibration grouting column (405) is anti-vibration grouting material mixed with rubber particles. The elastic buffer block (409) is elastic sealant. The installation position of the first L-shaped limiting plate (406) corresponds to the installation position of the second L-shaped limiting plate (408).

5. The anti-disturbance steel pipe truss prestressed composite slab according to claim 1, characterized in that: The butterfly spring (504) is made of stainless steel. The support plate (502) is movably sleeved on the outer wall of the guide screw (506). The two sides of the outer wall of the support plate (502) are in contact with the bottom of the limit nut (507) and the top of the locking nut (508), respectively.

6. The anti-disturbance steel pipe truss prestressed composite slab according to claim 5, characterized in that: The inner diameter of the support plate (502) matches the outer diameter of the guide screw (506), and the bottom of the viscous damper (505) is connected to the top of the disc spring (504).

7. The construction process of a disturbance-resistant steel pipe truss prestressed composite slab according to claim 6, characterized in that: Includes the following steps: S1: When constructing the composite slab body (401), anti-vibration grouting column (405) is injected into the inner cavity of the upper chord pipe (403), so that the inner cavity of the upper chord pipe (403) is filled with anti-vibration grouting column (405), and the composite slab body (401) is erected on the top of the longitudinal beam (1) and the transverse beam (2), and the composite slab bodies (401) on both sides enter the inner cavity of the steel cage (3), and the support cylinder (503) is placed on the top of the transverse beam (2). The position of the support plate (502) is adjusted by rotating the locking nut (508) and the limiting nut (507), and then the mounting base (501) can be installed on the outer wall of the composite slab body (401). S2: Then, use locking bolts (407) to fix the first L-shaped limiting plate (406) so that the first L-shaped limiting plate (406) is installed on the outer wall of the composite plate body (401), and use fixing bolts (4010) to install and fix the second L-shaped limiting plate (408) so that the bottom of the second L-shaped limiting plate (408) is installed on the top of the longitudinal beam (1). Inject elastic sealant between the first L-shaped limiting plate (406) and the second L-shaped limiting plate (408) and let it cure to form an elastic buffer block (409). S3: When pouring concrete for the cast-in-place layer on top of the composite slab body (401), first pour 40 mm of concrete onto the top of the composite slab body (401), and after an interval of 24 hours, pour 45 mm of concrete.

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