A ppvc module construction based on alkali activated concrete

Abstract

The application belongs to the technical field of PPVC modular building, and particularly relates to a ppvc module structure based on alkali-activated concrete; the ppvc module structure comprises a module body, the module body is provided with a low gravity center structure, a reinforcing beam is integrally formed at the bottom of the inner surface of the four side walls of the module body, and three-stage damping mechanisms are arranged on the inner side of the reinforcing beam. The alkali-activated concrete has the characteristics of greater density than ordinary concrete and high structural strength, and by reasonably configuring the application proportion of the alkali-activated concrete in different sections, the gravity center of the PPVC space module can be lowered, and the structure is more stable and has better anti-seismic capacity. Meanwhile, the reinforcing beam with a rectangular structure is arranged to connect the bottom plate and the side wall into an integral structure, and the four three-stage damping mechanisms arranged in the reinforcing beam can dissipate energy according to different earthquake levels, and the anti-seismic capacity of the PPVC building structure is further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of PPVC modular building, and particularly relates to a ppvc module structure based on alkali-activated concrete. BACKGROUND

[0002] The PPVC space module is a cubic box structure, including four walls, a top plate, a bottom plate, and a plurality of PPVC space modules can be used to build a multi-storey building or a high-rise building or a building group.

[0003] The PPVC space module is hoisted and spliced into a complete multi-storey building or a high-rise building or a building group, and the stability and the seismic performance of the structure are related to the safety and the service life of the building structure. The existing PPVC space module is mostly constructed by reinforced concrete with uniform quality, which can achieve a certain strength and preliminarily meet the safety of use, but still has a lot of room for improvement. In addition, the seismic and damping measures for the PPVC building structure are mostly limited to the seismic means of ordinary cast-in-place buildings, such as setting friction pendulum and damper to improve the seismic resistance, and there are few seismic structures specially developed for PPVC modular buildings, so it is necessary to improve the prior art. SUMMARY

[0004] The application discloses a ppvc module structure based on alkali-activated concrete, and aims to solve the problems in the prior art that the existing PPVC space module is mostly constructed by reinforced concrete with uniform quality, which can achieve a certain strength and preliminarily meet the safety of use, but still has a lot of room for improvement. In addition, the seismic and damping measures for the PPVC building structure are mostly limited to the seismic means of ordinary cast-in-place buildings, such as setting friction pendulum and damper to improve the seismic resistance, and there are few seismic structures specially developed for PPVC modular buildings.

[0005] To achieve the above-mentioned purpose, the technical scheme of the application is as follows:

[0006] A ppvc module structure based on alkali-activated concrete, comprising a hexahedral module body, the module body is provided with a low gravity center structure, a rectangular reinforcing beam is integrally formed at the bottom of the inner surface of the four side walls of the module body, each side of the reinforcing beam is provided with a three-stage damping mechanism, the bottom of the reinforcing beam is fixedly connected with the bottom plate of the module body, and the outer side of the reinforcing beam is fixedly connected with the side wall structure.

[0007] Preferably, the reinforcing beam is welded by rectangular steel pipes, the bottom and outer side of the reinforcing beam are welded with the steel reinforcement cage in the bottom plate and side wall through connecting steel bars, respectively, the three-stage damping mechanism comprises a first mass block in the inner cavity of the reinforcing beam and a second mass block in the inner cavity of the first mass block, two ends of the first mass block are fixedly connected with two ends of the inner cavity of the reinforcing beam through first damping springs, two ends of the second mass block are fixedly connected with two ends of the inner cavity of the first mass block through second damping springs, one end of the inner side of the first damping spring is provided with a sleeve, one end of the sleeve is fixedly connected with the end of the inner cavity of the reinforcing beam, a third damping spring is arranged in the sleeve, one end of the third damping spring is connected with the end of the sleeve away from the first mass block, the other end of the third damping spring is fixedly connected with a sliding block, and the sliding block is in sliding connection with the sleeve; two ends of the first mass block are also connected with sliding rods, the sliding rods are located in the first damping spring and are in sliding connection with the inner wall of the sleeve, one end of the sliding rod is fixedly connected with the end of the first mass block, and the other end is separated from the sliding block; the stiffness of the first damping spring, the second damping spring and the third damping spring increases in sequence, and each is used to realize three-stage enhanced damping energy dissipation for small earthquakes, medium earthquakes, large earthquakes or giant earthquakes.

[0008] Preferably, the three-stage enhanced damping energy dissipation refers to: 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-stage damping energy dissipation is realized through the second damping spring; in the case of medium earthquakes, on the basis of the first-stage damping energy dissipation, the first mass block moves back and forth in the inner cavity of the reinforcing beam, and the second-stage enhanced damping energy dissipation is realized through the first damping spring; in the case of large earthquakes or giant earthquakes, on the basis of the first-stage damping energy dissipation and the second-stage enhanced damping energy dissipation, the sliding rod contacts the sliding block, under the drive of the sliding rod, the sliding block extrudes the third damping spring, and the third-stage enhanced damping energy dissipation is realized, while the reinforcing beam reinforces the bottom plate and the side wall into a whole, the front and rear and left and right direction damping energy dissipation is realized through the three-stage damping energy dissipation mechanism in the four side edges of the reinforcing beam.

[0009] Preferably, the top end of the module body is provided with an inverted quadrangular frustum-shaped guide groove, and the bottom end is provided with an inverted quadrangular frustum-shaped guide block, the guide groove and the guide block are used in cooperation, the top end of the module body is also pre-buried with sleeves with internal threads at four corners, the sleeves are configured with screw rods, the top end of the screw rod is provided with a connecting ring, and the four connecting rings are used to be connected with the bottom end of the steel 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 pouring hole penetrating through the bottom end of the guide block.

[0010] Preferably, the low gravity center structure refers to that the four side walls of the module body are non-uniform mass structures, and the density gradually decreases from bottom to top, the gravity center of the module body is lower than that 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 sequentially provided with a plurality of segments from bottom to top, and the density of the plurality of segments decreases from bottom to top; the segment at the bottom is formed by pouring alkali-activated concrete and a steel reinforcement cage, the segment at the top is formed by pouring ordinary concrete and a steel reinforcement cage, the density of the alkali-activated concrete is greater than that of the ordinary concrete; the segments between the segment at the bottom and the segment at the top are formed by pouring mixed alkali-activated concrete and ordinary concrete combined with a steel reinforcement cage, and the proportion of the alkali-activated concrete decreases from bottom to top.

[0012] Preferably, the steel reinforcement cages of the four side walls are connected into one whole, and a layer of thermal insulation material is further arranged on the inner side of the side walls and at the top of the reinforcing beams.

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

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

[0015] The PPVC module structure based on alkali-activated concrete has the following beneficial effects:

[0016] The application utilizes the characteristics that the density of alkali-activated concrete is greater than that of ordinary concrete but the structural strength is high, and by reasonably configuring the application proportion of alkali-activated concrete in different segments, the center of gravity of the PPVC spatial module can be lowered, and the structure is more stable and has better anti-seismic capacity. Meanwhile, by arranging the reinforcing beams in a rectangular structure, the bottom plate and the side walls can be connected into a whole structure, and by arranging four three-order damping mechanisms in the reinforcing beams, damping energy consumption can be performed according to different earthquake levels, and the anti-seismic capacity of the PPVC building structure is further improved. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 It is a schematic diagram of the rear view structure of the application.

[0019] Figure 3 It is a schematic diagram of the top view structure of the application.

[0020] Figure 4 It is a schematic diagram of the bottom view structure of the application.

[0021] Figure 5 It is a schematic diagram of the sectional structure of the application in A-A direction.

[0022] Figure 6 It is a schematic diagram of the sectional structure of the application in C-C direction (partial sectional view of the reinforcing beam).

[0023] Figure 7 A local structure schematic diagram of the present application.

[0024] 1, module body; 2, top plate; 3, front door; 4, front window; 5, side window; 6, section; 601, the bottommost section; 602, the second section; 603, the third section; 604, the fourth section; 605, the topmost section; 7, pouring hole; 8, inner cavity of the reinforcing beam; 9, first mass; 10, inner cavity of the first mass; 11, guide groove; 12, sleeve; 13, guide block; 14, bottom plate; 15, side wall; 16, reinforcing beam; 17, thermal insulation material layer; 18, first damping spring; 19, sliding rod; 20, sleeve; 21, sliding block; 22, third damping spring; 23, second mass; 24, second damping spring. DETAILED DESCRIPTION

[0025] The following description is only a preferred embodiment of the present application, and is not intended to limit the scope of protection of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

[0026] The following embodiments can be understood as part of the local structure or method of the present application, or as a combination of embodiments to explain the larger scope of the structure or method of the present application.

[0027] Embodiment 1

[0028] A ppvc module structure based on alkali-activated concrete, as shown in Figures 1-7 , including a hexahedral structure module body 1, the module body 1 is provided with a low gravity center structure, a rectangular structure reinforcing beam 16 is integrally formed at the bottom of the inner surface of the four side walls of the module body 1, the inner side of each side of the reinforcing beam 16 is provided with a three-stage damping mechanism, the bottom of the reinforcing beam 16 is fixedly connected with the bottom plate of the module body 1, and the outer side of the reinforcing beam 16 is fixedly connected with the side wall 15 structure, that is, the bottom plate and the side wall are connected as a whole structure through the reinforcing beam, and the three-stage damping mechanism is provided in the inner side of each side, which realizes damping energy consumption under various earthquake conditions and ensures the stability of the building structure. At the same time, the low gravity center structure is provided, which can further reduce the gravity center of the module body. Under the condition of low gravity center, the module body has higher stability, and the anti-seismic effect is better.

[0029] Embodiment 2

[0030] As shown in Figures 1-7As shown, the reinforcing beam 16 is welded by rectangular steel pipes, the bottom and outer side of the reinforcing beam 16 are welded with the steel reinforcement cage in the bottom plate and side wall through connecting steel bars, the three-stage damping mechanism includes a first mass block 9 in the inner cavity of the reinforcing beam, 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 fixedly connected with the two ends of the inner cavity of the reinforcing beam through the first damping spring 18, the two ends of the second mass block 23 are fixedly connected with the two ends of the inner cavity of the first mass block 9 through the second damping spring 24, one end of the inner side of the first damping spring 18 is provided with a sleeve 20, one end of the sleeve 20 is fixedly connected with the end of the inner cavity of the reinforcing beam 8, the third damping spring 22 is arranged in the sleeve 20, one end of the third damping spring 22 is connected with the end of the sleeve 20 away from the first mass block 9, the other end of the third damping spring 22 is fixedly connected with a sliding block 21, and the sliding block 21 is in sliding connection with the sleeve 20; the two ends of the first mass block 9 are also connected with sliding rods 19, the sliding rods 19 are located in the first damping spring 18 and are in sliding connection with the inner wall of the sleeve 20, one end of the sliding rod 19 is fixedly connected with the end of the first mass block 9, and the other end is separated from the sliding block 21; the stiffness of the first damping spring 18, the second damping spring 24 and the third damping spring 22 increases in turn, and is respectively used to realize three-stage enhanced damping energy dissipation for small earthquakes, medium earthquakes, large earthquakes or giant earthquakes.

[0031] As shown in Figure 6 , 7 , the three-stage enhanced damping energy dissipation refers to: in the case of small earthquakes, the second mass block 23 moves back and forth in the inner cavity of the first mass block 9, and realizes first-stage damping energy dissipation through the second damping spring 24; in the case of medium earthquakes, on the basis of the first-stage damping energy dissipation, the first mass block 9 moves back and forth in the inner cavity of the reinforcing beam 8, and realizes second-stage enhanced damping energy dissipation through the first damping spring 18; in the case of large earthquakes or giant earthquakes, on the basis of the first-stage damping energy dissipation and the second-stage enhanced damping energy dissipation, the sliding rod 19 contacts the sliding block 21, under the drive of the sliding rod 19, the sliding block 21 extrudes the third damping spring 22, and realizes three-stage enhanced damping energy dissipation, while the reinforcing beam 16 reinforces the bottom plate and the side wall into a whole, the front and back and left and right direction damping energy dissipation is realized through the three-stage damping energy dissipation mechanism in the four side edges of the reinforcing beam 16.

[0032] In the embodiment, the mass and size of the first mass block and the second mass block can be designed according to the needs of earthquake resistance, and the elastic force and stiffness of the first to third damping springs can be designed according to the implementation mechanism of the embodiment. By arranging the reinforcing beam and the four three-stage damping mechanisms inside the reinforcing beam, the structural strength and the earthquake resistance of the module body can be effectively improved.

[0033] Embodiment 3

[0034] As shown in Figures 1-7As shown in the figure, the top end of the module body 1 is provided with an inverted quadrangular prism-shaped guide groove 11, and the bottom end is provided with an inverted quadrangular prism-shaped guide block 13, the guide groove 11 is used in cooperation with the guide block 13, and a sleeve 12 provided with an internal thread is pre-buried at the four corners of the top end of the module body, the sleeve 12 is provided with a screw rod (a common structure, not shown in the figure), and the top end of the screw rod is provided with a connecting ring, and the four connecting rings are used to be connected with the bottom end of the wire rope of the crane.

[0035] As shown in the figure, Figures 1-4 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 pouring hole 7 penetrating through the bottom end of the guide block 13.

[0036] In this embodiment, when hoisting, the sleeve is screwed with the screw rod, and the wire rope of the crane is connected with the connecting ring. Since the module body is provided with a low gravity center structure, the attitude in the air is relatively easy to maintain stability, thereby reducing the hoisting difficulty. In addition, the guide block and the guide groove are arranged, and when the upper and lower adjacent module bodies are butt-jointed, the guide block can easily enter the guide groove. After butt-jointing in place, 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, the concrete slurry is injected through the pouring hole, and the upper and lower module bodies are poured 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-poured foundation bottom plate, and the cooperation and pouring mode are the same as above.

[0038] Embodiment 4

[0039] As shown in the figure, Figures 1-7 the low gravity center structure refers to that the four side walls of the module body 1 are non-uniform mass structures, and the density gradually decreases from bottom to top, and the gravity center of the module body 1 is lower than that of a 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, which are usually reinforced concrete structures composed of ordinary concrete combined with steel reinforcement cages. The gravity center of this structure is relatively high, although it meets the structural stability requirement, but there is further improvement space. The present application is provided that the four side walls of the module body 1 are non-uniform mass structures, and the density gradually decreases from bottom to top, so that the gravity center of the module body can be lowered, and the stability and seismic performance of the PPVC space module can be improved.

[0041] Embodiment 5

[0042] As shown in the figure, Figures 1-7As shown, the four side walls of the module body are provided with several segments 6 from bottom to top, and the density of the segments 6 decreases from bottom to top.

[0043] Example 6

[0044] like Figures 1-7 As shown, the bottom segment 601 is formed by casting alkali-activated concrete and a reinforcing cage, while the top segment 605 is formed by casting ordinary concrete and a reinforcing cage. The density of alkali-activated concrete is greater than that of ordinary concrete. The density of alkali-activated concrete is typically 3.1-3.6 g / cm³. 3 The density of ordinary concrete is typically between 2.3 and 2.5 g / cm³. 3 In between, alkali-activated concrete and ordinary concrete of the required density can be configured according to the needs of the project.

[0045] like Figures 1-7 As shown, the section between the bottommost segment 601 and the topmost segment 605 is formed by casting a reinforced cage using a mixture of alkali-activated concrete and ordinary concrete, with the proportion of alkali-activated concrete decreasing sequentially from bottom to top. Because alkali-activated concrete has a higher density but higher strength than ordinary concrete, the mixed use achieves a gradual decrease in the density (mass) of the sidewall from bottom to top. Considering the impact of reserved doors and windows, the segments can be determined using the same surface area method, i.e., the surface area of ​​each segment is set to be the same (excluding the portion reserved for doors and windows).

[0046] like Figures 1-7 As shown, the steel cages of the four side walls are connected to each other to form a whole. An insulation material layer 17 is also provided on the inner side of the side walls and at the top of the reinforcing beam. That is, the mass of the steel cages is evenly distributed, but they are connected as a whole structure. Only the ratio of ordinary concrete and alkali-activated concrete poured in sections is controlled.

[0047] Example 7

[0048] like Figures 1-6 As shown, the left and right sidewalls of the module body 1 have the same weight, and the front and rear sidewalls have the same weight.

[0049] Example 8

[0050] like Figures 1-6 As shown, the center of gravity of the module body 1 is located on the vertical line of the center of the bottom support surface of the module body. That is to say, the center of gravity of the building structure built by several module bodies is also located on the 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 seismic resistance is improved.

[0052] It needs to be explained: the construction method of the PPVC space module involved in the application selects the method recorded in the patent document with the application number CN202010680526.4 and the name of a method for forming a PPVC module by external mold pouring. The difference lies in that different alkali-activated concrete and ordinary concrete slurry are used in sections when pouring concrete. Because the density of the upper layer of slurry is lower than that of the lower layer of slurry, the slurry with low density can float above the slurry with high density, so that continuous pouring operation can be realized. At the same time, the reinforcing beam is pre-welded and fixed with the reinforcement cage of the bottom plate and the side wall through connecting steel, and the reinforcing beam itself should be subjected to corrosion and rust prevention treatment. The thermal insulation material layer of the application preferably uses lightweight concrete, which has certain supporting capacity and also has thermal insulation performance, which is conducive to improving the comfort in the module body.

Claims

1. A PPVC module structure based on alkali-activated concrete, characterized in that: The module body includes a hexahedral structure with a low center of gravity. Rectangular reinforcing beams are integrally formed on the bottom of the inner surfaces of the four side walls of the module body. Each side of the reinforcing beam is provided with a three-stage damping mechanism. The bottom of the reinforcing beam is fixedly connected to the bottom plate of the module body, and the outer side of the reinforcing beam is fixedly connected to the side wall structure. The reinforcing beam is welded from rectangular steel pipes. The bottom and outer sides of the reinforcing beam are welded to the reinforcing cage in the base plate and side wall via connecting steel bars. The three-stage damping mechanism includes a first mass block located within the cavity of the reinforcing beam and a second mass block located within the cavity of the first mass block. The two ends of the first mass block are fixedly connected to the two ends of the cavity of the reinforcing beam via first damping springs. The two ends of the second mass block are fixedly connected to the two ends of the cavity of the first mass block via second damping springs. A sleeve is provided on one end of the inner side of the first damping spring, and one end of the sleeve is fixedly connected to the end of the cavity of the reinforcing beam. A [further details about the sleeve are missing]. A third damping spring is provided, with one end connected to the end of the sleeve away from the first mass block, and the other end of the third damping spring fixedly connected to a slider, which is slidably connected to the sleeve. Both ends of the first mass block are also connected to sliding rods, which are located inside the first damping spring and 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 detached from the slider. The stiffness of the first, second, and third damping springs increases sequentially, and they are used to achieve three-stage enhanced damping and energy dissipation for small, moderate, large, or massive earthquakes, respectively. The aforementioned three-stage enhanced vibration damping and energy dissipation refers to the following: Under minor earthquakes, the second mass block moves back and forth within the cavity of the first mass block, achieving first-stage vibration damping and energy dissipation through the second damping spring; Under moderate earthquakes, based on first-stage vibration damping and energy dissipation, the first mass block moves back and forth within the cavity of the reinforcing beam, achieving second-stage enhanced vibration damping and energy dissipation through the first damping spring; Under major or massive earthquakes, based on first-stage and second-stage enhanced vibration damping and energy dissipation, the sliding rod contacts the slider, and under the drive of the sliding rod, the slider compresses the third damping spring, achieving third-stage enhanced vibration damping and energy dissipation. While the reinforcing beam strengthens the base plate and side walls into a whole, vibration damping and energy dissipation in the front-back and left-right directions are achieved through the three-stage vibration damping and energy dissipation mechanism within the four sides of the reinforcing beam. The module body has an inverted frustum-shaped guide groove at the top and an inverted frustum-shaped guide block at the bottom. The guide groove and the guide block are used in conjunction. At the four corners of the top of the module body, there are also sleeves with internal threads. The sleeves are equipped with screws. The top of the screws is equipped with connecting rings. The four connecting rings are used to connect to the bottom of the wire rope of the crane. The height of the guide groove is greater than the height of the guide block. The bottom plate of the module body has a casting hole that passes through the bottom of the guide block. The low center of gravity structure refers to the following: the four side walls of the module body are non-uniform mass structures with a density that gradually decreases from bottom to top; the center of gravity of the module body is lower than that of a conventional PPVC space module; and the four side walls of a conventional PPVC space module are uniform mass structures.

2. The PPVC module structure based on alkali-activated concrete as described in claim 1, characterized in that: The module body has four side walls with several segments arranged from bottom to top, and the density of the segments decreases from bottom to top. The bottommost segment is formed by casting alkali-activated concrete and a reinforcing cage, while the topmost segment is formed by casting ordinary concrete and a reinforcing cage. The density of the alkali-activated concrete is greater than that of the ordinary concrete. The segment between the bottommost and topmost segments is formed by casting a mixture of alkali-activated concrete and ordinary concrete with a reinforcing cage, and the proportion of alkali-activated concrete used decreases from bottom to top.

3. The PPVC module structure based on alkali-activated concrete as described in claim 2, characterized in that: The steel cages of the four side walls are connected to each other to form a whole, and an insulation material layer is also provided on the inside of the side walls and at the top of the reinforcing beam.

4. The PPVC module structure based on alkali-activated concrete as described in claim 3, characterized in that: The left and right sidewalls of the module body have the same weight, and the front and rear sidewalls have the same weight.

5. The PPVC module structure based on alkali-activated concrete as described in claim 4, characterized in that: 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.

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