Ppvc module structure based on alkali-activated concrete

Abstract

The invention belongs to the technical field of PPVC modular buildings, and particularly relates to a ppvc module structure based on alkali-activated concrete. Comprising a module body, the module body is provided with a low-gravity-center structure, reinforcing beams are integrally formed at the bottoms of the inner surfaces of four side walls of the module body, and three-step damping mechanisms are arranged on the inner sides of the reinforcing beams. The characteristics that the density of alkali-activated concrete is larger than that of common concrete, but the structural strength is high are utilized, and the application proportion of the alkali-activated concrete in different sections is reasonably configured, so that the gravity center of the PPVC space module can be lowered, the structure of the PPVC space module is more stable, and the PPVC space module has better shock resistance; according to the PPVC building structure, the bottom plate and the side walls can be connected into an integral structure, through the four third-order damping mechanisms arranged in the reinforcing beams, damping and energy dissipation can be conducted according to different earthquake levels, and the anti-seismic capacity of the PPVC building structure is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of PPVC modular buildings, and in particular relates to a PPVC module structure based on alkali-activated concrete. Background Art

[0002] The PPVC space module is a cubic box structure, including four walls, a top plate, and a bottom plate. Several PPVC space modules can be built into a multi-story building or a high-rise building or a building complex.

[0003] PPVC space modules are assembled and assembled into complete multi-story buildings, high-rise buildings or building complexes through hoisting. The stability and seismic performance of the structure are related to the safety and service life of the building structure. Existing PPVC space modules are mostly constructed with reinforced concrete of uniform quality. Although they can achieve a certain strength and initially meet the safety of use, there is still a lot of room for improvement. In addition, the seismic and shock-absorbing measures for PPVC building structures are mostly limited to the seismic means of ordinary cast-in-place buildings, such as improving seismic resistance by setting friction pendulums and dampers. There are few seismic-resistant structures specifically developed for PPVC modular buildings. Therefore, it is necessary to improve the existing technology. Summary of the invention

[0004] The present invention discloses a PPVC module structure based on alkali-activated concrete, the purpose of which is to solve the following problems existing in the prior art: the existing PPVC space modules are mostly constructed by reinforced concrete of uniform quality, which can achieve a certain strength and initially meet the safety of use, but there is still a lot of room for improvement. In addition, the seismic and shock-absorbing measures for PPVC building structures are mostly limited to the seismic means of ordinary cast-in-place buildings, such as improving seismic resistance by setting friction pendulums and dampers, and there are few seismic structures specifically developed for PPVC modular buildings.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] A PPVC module structure based on alkali-activated concrete includes a module body with a hexahedral structure. The module body is provided with a low center of gravity structure. A reinforcing beam with a rectangular structure is integrally formed at the bottom of the inner surface of the four side walls of the module body. A three-order shock absorbing mechanism is provided on the inner side of each side edge of the reinforcing beam. The bottom of the reinforcing beam is fixedly connected to the bottom plate of the module body, and the outer side surface of the reinforcing beam is fixedly connected to the side wall structure.

[0007] Preferably, the reinforcing beam is welded from a rectangular steel pipe, and the bottom and outer side of the reinforcing beam are respectively welded to the steel cage in the bottom plate and the side wall through connecting steel bars, and the three-order shock absorbing mechanism includes a first mass block located in the inner cavity of the reinforcing beam, and a second mass block arranged in the inner cavity of the first mass block, and the two ends of the first mass block are respectively fixedly connected to the two ends of the inner cavity of the reinforcing beam through a first shock absorbing spring, and the two ends of the second mass block are respectively fixedly connected to the two ends of the inner cavity of the first mass block through a second shock absorbing spring, and a sleeve is provided at one end of the inner side of the first shock absorbing spring, and one end of the sleeve is fixedly connected to the end of the inner cavity of the reinforcing beam, and the sleeve is provided with a sleeve. A third shock-absorbing spring is provided inside, one end of the third shock-absorbing spring is connected to an end of the sleeve away from the first mass block, and the other end of the third shock-absorbing spring is fixedly connected to a slider, and the slider is slidably connected to the sleeve; the two ends of the first mass block are also respectively connected to sliding rods, and the sliding rods are located in the first shock-absorbing spring and are slidably connected to the inner wall of the sleeve, one end of the sliding rod is fixedly connected to the end of the first mass block, and the other end is separated from the slider; the stiffness of the first shock-absorbing spring, the second shock-absorbing spring and the third shock-absorbing spring increases successively, and are used to achieve three-order enhanced shock absorption and energy consumption for small earthquakes, medium earthquakes, large earthquakes or huge earthquakes, respectively.

[0008] Preferably, the third-order enhanced shock absorption energy dissipation means that: in the case of a small earthquake, the second mass block moves back and forth in the inner cavity of the first mass block, and the first-order shock absorption energy dissipation is achieved through the second shock absorption spring; in the case of a medium earthquake, on the basis of the first-order shock absorption energy dissipation, the first mass block moves back and forth in the inner cavity of the reinforcing beam, and the second-order enhanced shock absorption energy dissipation is achieved through the first shock absorption spring; in the case of a large earthquake or a huge earthquake, on the basis of the first-order shock absorption energy dissipation and the second-order enhanced shock absorption energy dissipation, the sliding rod contacts the sliding block, and under the drive of the sliding rod, the sliding block squeezes the third shock absorption spring to achieve the third-order enhanced shock absorption energy dissipation, and while the reinforcing beam reinforces the bottom plate and the side wall into a whole, the third-order shock absorption energy dissipation mechanism in the four sides of the reinforcing beam is used to achieve the front and rear and left and right directions.

[0009] Preferably, the top of the module body is provided with an inverted quadrangular trapezoidal guide groove, and the bottom end is provided with an inverted quadrangular trapezoidal guide block. The guide groove is used in conjunction with the guide block. Sleeves with internal threads are also pre-buried at the four corners of the top of the module body. The sleeve is provided with a screw. A connecting ring is provided at the top of the screw. The four connecting rings are used to connect with the bottom end of the wire rope of the crane. The height of the guide groove is greater than the height of the guide block, and the bottom plate of the module body is provided with a casting hole that passes through the bottom end of the guide block.

[0010] Preferably, the low center of gravity structure means that: the four side walls of the module body are non-uniform mass structures, and the density gradually decreases from bottom to top, the center of gravity of the module body is lower than the center of gravity of a conventional PPVC space module, and the four side walls of the conventional PPVC space module are uniform mass structures.

[0011] Preferably, the four side walls of the module body are provided with a number of sections from bottom to top, and the density of the sections decreases from bottom to top; the section at the bottom is cast by alkali-activated concrete and a steel cage, and the section at the top is cast by ordinary concrete and a steel cage, and the density of the alkali-activated concrete is greater than that of the ordinary concrete; the section between the bottom section and the top section is cast by mixed alkali-activated concrete and ordinary concrete combined with a steel cage, and the proportion of alkali-activated concrete decreases from bottom to top.

[0012] Preferably, the steel cages of the four side walls are connected to each other to form a whole, and a layer of thermal insulation material is provided on the inner side of the side wall and on the top of the reinforcing beam.

[0013] Preferably, the weights of the left and right side walls of the module body are the same, and the weights of the front and rear end side walls are the same.

[0014] Preferably, the center of gravity of the module body is located on a vertical line at the center of the bottom support surface of the module body.

[0015] The beneficial effects of the PPVC module structure based on alkali-activated concrete of the present invention are:

[0016] The present invention utilizes the characteristics of alkali-activated concrete, which has a higher density than ordinary concrete but a higher structural strength. By reasonably configuring the application ratio of alkali-activated concrete in different sections, the center of gravity of the PPVC space module can be lowered, thereby making its structure more stable and having better earthquake resistance. At the same time, the present invention can connect the bottom plate and the side wall into an integral structure by arranging a reinforcing beam with a rectangular structure. Through the four third-order shock absorbing mechanisms arranged in the reinforcing beam, shock absorption and energy consumption can be performed according to different earthquake levels, thereby further improving the earthquake resistance of the PPVC building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a rear structural schematic diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0020] Figure 4 It is a bottom view structural schematic diagram of the present invention.

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure along the AA direction of the present invention.

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure along CC direction of the present invention (partial cross-sectional view of the reinforcing beam).

[0023] Figure 7 It is a schematic diagram of the local structure of B of the present invention.

[0024] 1. Module body; 2. Top plate; 3. Front door; 4. Front window; 5. Side window; 6. Segments; 601. Bottom segment; 602. Second segment; 603. Third segment; 604. Fourth segment; 605. Top segment; 7. Casting hole; 8. Inner cavity of reinforcing beam; 9. First mass block; 10. Inner cavity of first mass block; 11. Guide groove; 12. Sleeve; 13. Guide block; 14. Bottom plate; 15. Side wall; 16. Reinforcement beam; 17. Insulation material layer; 18. First shock-absorbing spring; 19. Slide bar; 20. Sleeve; 21. Slider; 22. Third shock-absorbing spring; 23. Second mass block; 24. Second shock-absorbing spring. DETAILED DESCRIPTION

[0025] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0026] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0027] Example 1

[0028] A PPVC module structure based on alkali activated concrete, such as Figure 1-7 As shown, the module body 1 includes a hexahedral structure, and the module body 1 is provided with a low center of gravity structure. A reinforcing beam 16 of a rectangular structure is integrally formed at the bottom of the inner surface of the four side walls of the module body 1, and a three-order shock absorbing mechanism is provided on the inner side of each side of the reinforcing beam 16. The bottom of the reinforcing beam 16 is fixedly connected to the bottom plate of the module body 1, and the outer side surface of the reinforcing beam 16 is fixedly connected to the side wall 15 structure, that is, the bottom plate and the side wall are connected into an integral structure through the reinforcing beam on the one hand, and on the other hand, the three-order shock absorbing mechanism is provided in the four sides to achieve shock absorption and energy consumption in various earthquake situations and ensure the stability of the building structure. At the same time, a low center of gravity structure is provided to further reduce the center of gravity of the module body. Under the condition of low center of gravity, the module body has higher stability and better anti-seismic effect.

[0029] Example 2

[0030] like Figure 1-7As shown, the reinforcing beam 16 is welded by a rectangular steel pipe, and the bottom and outer side of the reinforcing beam 16 are respectively welded to the steel cage in the bottom plate and the side wall through connecting steel bars. The three-order shock absorbing mechanism includes a first mass block 9 located in the inner cavity 8 of the reinforcing beam, and a second mass block 23 arranged in the inner cavity of the first mass block 9. The two ends of the first mass block 9 are respectively fixedly connected to the two ends of the inner cavity 8 of the reinforcing beam through a first shock absorbing spring 18, and the two ends of the second mass block 23 are respectively fixedly connected to the two ends of the inner cavity of the first mass block 9 through a second shock absorbing spring 24. A sleeve 20 is provided at one end of the inner side of the first shock absorbing spring 18, and one end of the sleeve 20 is fixedly connected to the end of the inner cavity 8 of the reinforcing beam, and a second shock absorbing spring 24 is provided in the sleeve 20. Three shock-absorbing springs 22, one end of the third shock-absorbing spring 22 is connected to the end of the sleeve 20 away from the first mass block 9, and the other end of the third shock-absorbing spring 22 is fixedly connected to a slider 21, and the slider 21 is slidably connected to the sleeve 20; the two ends of the first mass block 9 are also respectively connected to sliding rods 19, and the sliding rod 19 is located in the first shock-absorbing spring 18 and is slidably connected to the inner wall of the sleeve 20, one end of the sliding rod 19 is fixedly connected to the end of the first mass block 9, and the other end is separated from the slider 21; the stiffness of the first shock-absorbing spring 18, the second shock-absorbing spring 24, and the third shock-absorbing spring 22 increases successively, and are used to achieve three-order enhanced shock absorption and energy consumption for small earthquakes, medium earthquakes, large earthquakes or huge earthquakes, respectively.

[0031] like Figure 6 , 7 As shown, the three-order enhanced shock absorption energy dissipation means that in the case of a small earthquake, the second mass block 23 moves back and forth in the inner cavity of the first mass block 9, and the first-order shock absorption energy dissipation is realized by the second shock absorption spring 24; in the case of a medium earthquake, on the basis of the first-order shock absorption energy dissipation, the first mass block 9 moves back and forth in the inner cavity 8 of the reinforcing beam, and the second-order enhanced shock absorption energy dissipation is realized by the first shock absorption spring 18; in the case of a large earthquake or a huge earthquake, on the basis of the first-order shock absorption energy dissipation and the second-order enhanced shock absorption energy dissipation, the sliding rod 19 contacts the sliding block 21, and under the drive of the sliding rod 19, the sliding block 21 squeezes the third shock absorption spring 22 to realize the three-order enhanced shock absorption energy dissipation, and while the reinforcing beam 16 reinforces the bottom plate and the side wall into a whole, the three-order shock absorption energy dissipation mechanism in the four side edges of the reinforcing beam realizes the front and rear and left and right directions of shock absorption energy dissipation.

[0032] In this embodiment, the mass size of the first mass block and the second mass block can be designed according to the seismic requirements, and the elastic force and stiffness of the first to third damping springs can be designed according to the implementation mechanism of this embodiment. By providing the reinforcing beam and the four third-order damping mechanisms inside it, the structural strength and seismic performance of the module body can be effectively improved.

[0033] Example 3

[0034] like Figure 1-7As shown, the top of the module body 1 is provided with an inverted quadrangular cone-shaped guide groove 11, and the bottom is provided with an inverted quadrangular cone-shaped guide block 13. The guide groove 11 is used in conjunction with the guide block 13. Sleeves 12 with internal threads are also pre-buried at the four corners of the top of the module body. The sleeve 12 is equipped with a screw (a commonly used structure, not shown in the figure), and the top of the screw is provided with a connecting ring, and the four connecting rings are used to connect to the bottom end of the wire rope of the crane.

[0035] like Figure 1-4 As shown, the height of the guide groove 11 is greater than the height of the guide block 13 , and the bottom plate of the module body 1 is provided with a casting hole 7 penetrating the bottom end of the guide block 13 .

[0036] In this embodiment, during hoisting, the sleeve is screwed to the screw rod, and the wire rope of the crane is connected to the connecting ring. Since the module body is provided with a low center of gravity structure, it is easier to maintain a stable posture in the air, thereby reducing the difficulty of hoisting. In addition, guide blocks and guide grooves are provided. When the upper and lower adjacent module bodies are docked, the guide blocks can easily enter the guide grooves. After docking, since the height of the guide groove 11 is greater than the height of the guide block 13, there is a certain space between the bottom end of the guide block and the bottom end of the guide groove. At this time, concrete slurry is injected through the casting hole to cast the upper and lower module bodies into an integral structure.

[0037] It should be noted that the guide block of the bottommost module body cooperates with the guide groove on the pre-cast foundation bottom plate, and the cooperation and casting methods are the same as above.

[0038] Example 4

[0039] like Figure 1-7 As shown, the low center of gravity structure means that: the four side walls of the module body 1 are non-uniform mass structures, and the density gradually decreases from bottom to top, the center of gravity of the module body 1 is lower than the center of gravity of the conventional PPVC space module, and the four side walls of the conventional PPVC space module are uniform mass structures.

[0040] In this embodiment, the four side walls of the conventional PPVC space module are uniform mass structures, usually reinforced concrete structures composed of ordinary concrete combined with steel cages. The center of gravity of this structure is relatively high. Although it meets the structural stability requirements, there is room for further improvement. The present invention is configured such that the four side walls of the module body 1 are non-uniform mass structures, and the density gradually decreases from bottom to top. Therefore, the center of gravity of the module body can be reduced, thereby improving the stability and seismic performance of the PPVC space module.

[0041] Example 5

[0042] like Figure 1-7As shown, the four side walls of the module body are provided with a plurality of segments 6 from bottom to top, and the density of the plurality of segments 6 decreases from bottom to top.

[0043] Example 6

[0044] like Figure 1-7 As shown, the bottom segment 601 is cast by alkali activated concrete and steel cage, and the top segment 605 is cast by ordinary concrete and steel cage. The density of alkali activated concrete is greater than that of ordinary concrete. The density of alkali activated concrete is usually 3.1-3.6 g / cm 3 The density of ordinary concrete is usually between 2.3-2.5g / cm 3 Alkali-activated concrete and ordinary concrete of required density can be configured according to project needs.

[0045] like Figure 1-7 As shown, the segment between the bottom segment 601 and the top segment 605 is cast by mixing alkali-activated concrete and ordinary concrete in combination with a steel cage, and the proportion of alkali-activated concrete used decreases from bottom to top. Since the density of alkali-activated concrete is greater than that of ordinary concrete, but the strength is high, after mixing, the side wall density (mass) can be reduced from bottom to top. Considering the influence of reserved doors and windows, the segmentation can be determined by the same surface area method, that is, the surface area of ​​each segment is set to be the same (excluding the part of reserved doors and windows).

[0046] like Figure 1-7 As shown, the steel cages of the four side walls are connected to each other into a whole, and a thermal insulation material layer 17 is provided on the inner side of the side wall and on the top of the reinforcing beam; that is, the mass of the steel cages is evenly distributed, but connected as an integral structure, and only the ratio of ordinary concrete and alkali-activated concrete poured in sections is controlled.

[0047] Example 7

[0048] like Figure 1-6 As shown, the weight of the left and right side walls of the module body 1 is the same, and the weight of the front and rear end side walls is the same.

[0049] Example 8

[0050] like Figure 1-6 As shown, the center of gravity of the module body 1 is located on a vertical line at the center of the bottom support surface of the module body. That is to say, the center of gravity of the building structure constructed by a number of module bodies is also located on a vertical line.

[0051] In this embodiment, since the center of gravity of the module body is located on the vertical line of the center of the bottom support surface of the module body, the stability of the module body is further guaranteed and the earthquake resistance is improved.

[0052] It should be noted that: the construction method of the PPVC space module involved in the present invention selects the method recorded in the patent document with application number CN202010680526.4 and name as a method for casting a PPVC module by external mold. The difference is that when pouring concrete for the side wall, slurries with different proportions of alkali-activated concrete and ordinary concrete are used in sections. Since the density of the slurry in the upper layer is lower than that in the lower layer, the slurry with low density can float above the slurry with high density, and continuous pouring operation can be realized; at the same time, the reinforcing beam is pre-fixed to the steel cage of the bottom plate and the side wall by connecting the steel bars and welding, and the reinforcing beam itself should be treated with anti-corrosion and anti-rust. The thermal insulation material layer of the present invention preferably uses lightweight concrete, which has a certain supporting capacity and thermal insulation performance, which is beneficial to improve the comfort level inside the module body.

Claims

1. A PPVC module structure based on alkali-activated concrete, characterized by: The invention comprises a module body of a hexahedral structure, wherein the module body is provided with a low center of gravity structure, and a reinforcing beam of a rectangular structure is integrally formed at the bottom of the inner surface of the four side walls of the module body, and a three-order shock absorbing mechanism is provided on the inner side of each side edge of the reinforcing beam, and the bottom of the reinforcing beam is fixedly connected to the bottom plate of the module body, and the outer side surface of the reinforcing beam is fixedly connected to the side wall structure.

2. A PPVC module structure based on alkali-activated concrete as claimed in claim 1, characterized in that: The reinforcing beam is welded from a rectangular steel pipe, and the bottom and outer side of the reinforcing beam are respectively welded to the steel cage in the bottom plate and the side wall through connecting steel bars. The three-order shock absorbing mechanism includes a first mass block located in the inner cavity of the reinforcing beam and a second mass block arranged in the inner cavity of the first mass block. The two ends of the first mass block are respectively fixedly connected to the two ends of the inner cavity of the reinforcing beam through a first shock absorbing spring, and the two ends of the second mass block are respectively fixedly connected to the two ends of the inner cavity of the first mass block through a second shock absorbing spring. A sleeve is provided at one end of the inner side of the first shock absorbing spring, and one end of the sleeve is fixedly connected to the end of the inner cavity of the reinforcing beam. There is a third shock-absorbing spring, one end of the third shock-absorbing spring is connected to an end of the sleeve away from the first mass block, and the other end of the third shock-absorbing spring is fixedly connected to a slider, and the slider is slidably connected to the sleeve; the two ends of the first mass block are also respectively connected to sliding rods, and the sliding rod is located in the first shock-absorbing spring and is slidably connected to the inner wall of the sleeve, one end of the sliding rod is fixedly connected to the end of the first mass block, and the other end is separated from the slider; the stiffness of the first shock-absorbing spring, the second shock-absorbing spring, and the third shock-absorbing spring increases in sequence, and are respectively used to achieve three-order enhanced shock absorption and energy consumption for small earthquakes, medium earthquakes, large earthquakes or huge earthquakes.

3. A PPVC module structure based on alkali-activated concrete as claimed in claim 2, characterized in that: The three-order enhanced shock absorption energy dissipation means that: in the case of small earthquakes, the second mass block moves back and forth in the inner cavity of the first mass block, and the first-order shock absorption energy dissipation is realized through the second shock absorption spring; in the case of medium earthquakes, on the basis of the first-order shock absorption energy dissipation, the first mass block moves back and forth in the inner cavity of the reinforcing beam, and the second-order enhanced shock absorption energy dissipation is realized through the first shock absorption spring; in the case of large or huge earthquakes, on the basis of the first-order shock absorption energy dissipation and the second-order enhanced shock absorption energy dissipation, the sliding rod contacts the sliding block, and under the drive of the sliding rod, the sliding block squeezes the third shock absorption spring to realize the three-order enhanced shock absorption energy dissipation, and while the reinforcing beam reinforces the bottom plate and the side wall into a whole, the three-order shock absorption energy dissipation mechanism in the four sides of the reinforcing beam realizes the front and rear and left and right directions of shock absorption energy dissipation.

4. A PPVC module structure based on alkali-activated concrete as claimed in claim 3, characterized in that: The top of the module body is provided with an inverted quadrangular trapezoidal guide groove, and the bottom end is provided with an inverted quadrangular trapezoidal guide block. The guide groove is used in conjunction with the guide block. Sleeves with internal threads are also pre-buried at the four corners of the top of the module body. The sleeve is equipped with a screw rod. The top of the screw rod is provided with a connecting ring. The four connecting rings are used to connect with the bottom end of the wire rope of the crane; the height of the guide groove is greater than the height of the guide block, and the bottom plate of the module body is provided with a casting hole that passes through the bottom end of the guide block.

5. A PPVC module structure based on alkali-activated concrete as claimed in claim 4, characterized in that: The low center of gravity structure means that the four side walls of the module body are non-uniform mass structures, and the density gradually decreases from bottom to top. The center of gravity of the module body is lower than the center of gravity of a conventional PPVC space module, and the four side walls of the conventional PPVC space module are uniform mass structures.

6. A PPVC module structure based on alkali-activated concrete as claimed in claim 5, characterized in that: The four side walls of the module body are provided with a number of sections from bottom to top, and the density of the sections decreases from bottom to top; the section at the bottom is cast by alkali-activated concrete and a steel cage, and the section at the top is cast by ordinary concrete and a steel cage, and the density of the alkali-activated concrete is greater than that of the ordinary concrete; the section between the bottom section and the top section is cast by mixed alkali-activated concrete and ordinary concrete combined with a steel cage, and the proportion of alkali-activated concrete used decreases from bottom to top.

7. A PPVC module structure based on alkali-activated concrete as claimed in claim 6, characterized in that: The steel cages of the four side walls are connected to each other into a whole, and a layer of thermal insulation material is provided on the inner side of the side wall and on the top of the reinforcing beam.

8. A PPVC module structure based on alkali-activated concrete as claimed in claim 7, characterized in that: The weight of the left and right side walls of the module body is the same, and the weight of the front and rear side walls is the same.

9. A PPVC module structure based on alkali-activated concrete as claimed in claim 8, characterized in that: The center of gravity of the module body is located on a vertical line at the center of the bottom support surface of the module body.

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