Fabricated large-cantilever heat insulation floor and construction method thereof

Abstract

The invention relates to an assembly type large cantilever heat insulation floor slab and a construction method thereof. The problems that a cantilever structure is poor in bearing capacity and a supporting structure is exposed are effectively solved. The integrally-poured stack wall is arranged at the fixed end of the floor slab, the steel beam arranged in the floor slab in an upward-hanging mode is arranged, the hidden type inclined strut effect is formed on the floor slab, the droop trend of the overhanging end of the floor slab can be effectively resisted, the bearing capacity and stability of the floor slab are remarkably improved, and the phenomenon that the visual impression of a building is affected by the display inclined strut is avoided; by designing the buttress wall, the position of the post-cast strip of the buttress wall and the supporting wall body is moved downwards, so that the post-cast strip is moved away from a load concentration position, namely a floor slab fixing end, and the post-cast strip is effectively prevented from cracking; when the bottom layer plate is poured, the lower surface of the bottom layer plate serves as the horizontal reference, and large-area slope finding caused by formwork erecting is avoided through conversion of the horizontal reference.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated building construction, and in particular to a prefabricated large cantilevered thermal insulation floor slab and a construction method thereof. Background Art

[0002] The large cantilevered floor form provides the building with a richer structural design and a stronger visual perception. At the same time, the large cantilever design also poses a greater challenge to the bearing capacity and stability of the floor. Especially in prefabricated construction, the post-cast connection between the cantilevered floor and the supporting wall is a weak point in the structural strength, and this is also the point where the floor load is maximized. The heavy position of the two greatly increases the risk of cracking in the post-cast strip.

[0003] The invention patent with application number: CN202410931183.2 provides a large-span composite composite floor and a construction method for the floor. It uses autoclaved aerated concrete blocks as built-in lightweight core materials to effectively reduce the deadweight of the floor to reduce part of the load. Although this method has a certain effect, it only relies on reducing part of the deadweight, and has limited effect on improving the bearing capacity of the floor, and it does not solve the problem of easy cracking of the above-mentioned post-cast strip.

[0004] The utility model patent with application number: CN202220720142.5 adopts the method of extending the fixed end of the floor slab in the opposite direction so that it extends out of the supporting wall, and setting a diagonal brace between the reverse extended end of the floor slab and the supporting wall to improve the stability and bearing capacity of the floor slab; whether it is a diagonal brace or a diagonal brace, the exposure of its supporting structure will affect the space utilization of the building structure and will greatly reduce the intuitive visual impact of the large cantilever structure. Summary of the Invention

[0005] The present invention provides an assembled large cantilevered thermal insulation floor and a construction method thereof, aiming to solve the problems of poor bearing capacity of the cantilevered structure and exposed supporting structure.

[0006] The technical solutions are as follows: An assembled large cantilevered thermal insulation floor comprises a top plate, a bottom plate, and a buttress wall, wherein the buttress wall is connected to the lower side of one end of the bottom plate, and the bottom plate and the buttress wall form an angle greater than 90 degrees; the top plate is located above the bottom plate, the lower surface of the top plate has the same slope as the bottom plate, and the upper surface is horizontal, and the top plate and the bottom plate together form the main body of the floor; Rectangular steel pipe piles are embedded in the buttress wall, and steel beams with the same slope as the bottom plate are arranged in the main body of the floor slab. Plug holes for inserting the ends of the steel beams are opened on the rectangular steel pipe piles, and the fixed ends of the steel beams are inserted into the rectangular steel pipe piles. Several groups of rectangular steel pipe piles and steel beams are evenly distributed along the wall.

[0007] Autoclaved aerated concrete blocks are embedded in the floor slab body.

[0008] The closer to the cantilevered end of the floor slab main body, the greater the arrangement density of the autoclaved aerated concrete blocks.

[0009] The upper ends of the rectangular steel pipe piles are inserted into the top floor plate.

[0010] The angle between the bottom plate and the buttress wall is no greater than 95 degrees.

[0011] A construction method for an assembled large cantilevered thermal insulation floor comprises the following steps: Step 1: With the bottom plate horizontal and the buttress wall inclined, support the buttress wall formwork and the bottom plate formwork; after the formwork is supported, tie the bottom plate reinforcement cage on the bottom plate formwork, tie the buttress wall reinforcement cage inside the buttress wall formwork, and when tying the buttress wall reinforcement cage, reserve installation holes for the steel pipe piles at the positions of the rectangular steel pipe piles, and reserve connecting steel bars for connection with the supporting wall at the bottom of the buttress wall; Step 2: After the butt wall and bottom plate reinforcement cage are completed, the rectangular square pipe piles are inserted into the mounting holes of the butt wall reinforcement cage, and then the steel beam is laid on the bottom plate reinforcement cage, and the end of the steel beam close to the butt wall is inserted into the socket hole of the rectangular steel pipe pile side wall; Step 3: Lay the autoclaved aerated concrete blocks on the bottom slab reinforcement cage, with the laying density gradually increasing from the fixed end to the cantilever end of the bottom slab, and then implant the prefabricated filling reinforcement cage into the gaps of the autoclaved aerated concrete blocks and tie it to the bottom slab reinforcement cage; Step 4: pouring the bottom slab concrete and the buttress wall concrete and waiting for them to solidify and form, with the pouring height reaching two-thirds of the autoclaved aerated concrete blocks; Step 5: Hoist the integrally formed bottom plate and buttress wall above the supporting wall. Pre-embed the top of the supporting wall with columns corresponding to the rectangular steel pipe piles and connecting steel bars so that the buttress wall and the supporting wall are aligned. The columns are inserted into the rectangular steel pipe piles one by one from the bottom of the buttress wall. A post-casting strip space is reserved between the bottom of the buttress wall and the top of the supporting wall to temporarily support and position the buttress wall and bottom plate. Step 6: Tie the connecting steel bars at the bottom of the buttress wall to the connecting steel bars at the top of the supporting wall, and set up the post-casting strip template. Then, pour the post-casting strip concrete. After the post-casting strip concrete is poured, immediately pour concrete from the top of the rectangular steel pipe pile into the rectangular steel pipe pile. After the concrete is formed, the buttress wall, the bottom plate and the supporting wall are assembled and fixed. Step 7: Set up the top slab side formwork above the bottom slab, with the bottom slab serving as the bottom formwork for the top slab. Then, hoist the prefabricated top slab reinforcement cage onto the bottom slab, tie the bottom of the top slab reinforcement cage to the filling reinforcement cage, and tie the end to the buttress wall reinforcement cage. Step eight: pour the top slab concrete, remove the formwork after the concrete is formed, and the construction is completed.

[0012] In steps 1, 3, and 7, use spacers to raise and level the steel cage.

[0013] In step 4, before pouring concrete, the upper end of the rectangular steel pipe pile is closed.

[0014] The present invention improves the strength of the fixed end of the floor slab and greatly reduces the risk of cracking of the fixed end of the floor slab by arranging an integrally cast buttress wall at the fixed end of the floor slab, plugging the end of the steel beam with the rectangular steel pipe pile, and thickening the fixed end of the floor slab.

[0015] Through the raised bottom slab and the steel beams set up in the floor slab, an implicit diagonal bracing effect is formed on the floor slab, which can effectively resist the sagging tendency of the cantilevered end of the floor slab, significantly improve the bearing capacity and stability of the floor slab, and avoid the visible diagonal bracing affecting the visual perception of the building.

[0016] By designing the buttress wall, the position of the post-cast strip between it and the supporting wall is moved downward, so that the post-cast strip is moved away from the load concentration position, that is, the fixed end of the floor slab. Then, the buttress wall and the floor slab are limited by rectangular steel pipe piles and columns to share the load of the post-cast strip, thereby effectively avoiding cracking of the post-cast strip.

[0017] When pouring the bottom slab, the lower surface of the bottom slab is used as the horizontal reference. By converting the horizontal reference, the need to support formwork to make large-area slope adjustment is avoided, and there is no need to control the slope of the upper surface of the bottom slab through the formwork. This not only realizes the upward structural formation of the bottom slab, but also greatly reduces the difficulty of formwork and pouring. When pouring the top slab, the buttress wall is used as the vertical reference, and the bottom slab is used as the bottom formwork of the top slab. During pouring, the upper surface of the top slab naturally forms a horizontal surface, which serves as the horizontal bearing surface of the floor slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional structure of the floor Figure 1 .

[0019] Figure 2 The three-dimensional structure of the floor Figure 2 .

[0020] Figure 3 This is a bottom view of the floor.

[0021] Figure 4 for Figure 3 Cross-sectional view at position AA.

[0022] Figure 5 for Figure 3 Cross-sectional view of the middle BB position.

[0023] Figure 6 This is the main sectional view of the assembly of floor slabs and walls.

[0024] Figure 7 This is the main view during the construction of steps one to three.

[0025] Figure 8 This is a three-dimensional diagram of the construction process from step one to step three.

[0026] Figure 9 This is the main view during construction of step 4.

[0027] Figure 10 This is a three-dimensional diagram during step four construction.

[0028] Figure 11 This is the main view during construction of step seven.

[0029] Figure 12 This is a three-dimensional diagram during step seven construction.

[0030] Figure 13 This is the main view during construction of step eight.

[0031] Figure 14 This is a three-dimensional diagram during the construction of step eight. DETAILED DESCRIPTION

[0032] When the top of the support frame is in the vertical direction, the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top of the support frame 2 is in the vertical direction, and the top

[0033] The buttress wall 3 is provided with pre-embedded rectangular steel pipe piles 4, and the floor main body is provided with a steel beam 5 with the same slope as the bottom plate 2. The rectangular steel pipe piles 4 are provided with a plug hole for the end of the steel beam 5 to be inserted. The fixed end of the steel beam 5 is inserted into the rectangular steel pipe pile 4, and the steel beam 5 is in an upward state with a slightly higher cantilevered end, providing auxiliary supporting force for the floor main body; the rectangular steel pipe piles 4 and the steel beam 5 are evenly distributed in several groups along the wall; the lower end of the rectangular steel pipe piles 4 is open to the bottom of the buttress wall 3, and the top of the supporting wall is pre-embedded with vertical columns. When the floor is assembled, the columns are correspondingly inserted into the rectangular steel pipe piles 4, and concrete is poured in the rectangular steel beam 5 in the subsequent process. The columns cooperate with the rectangular steel beam 5 to provide anti-overturning limit for the floor, which greatly reduces the tensile load generated by the gravity of the floor at the post-cast connection between the buttress wall 3 and the supporting wall.

[0034] The main body of the floor slab is embedded with autoclaved aerated concrete blocks 6. The lightweight and porous properties of the autoclaved aerated concrete blocks 6 can reduce the weight of the floor slab while improving the sound insulation and heat insulation performance of the floor slab.

[0035] Since the closer the cantilever floor is to the fixed end, the greater the bending moment load it bears, the closer it is to the cantilever end of the floor main body, the greater the arrangement density of the autoclaved aerated concrete blocks 6. In this way, the closer it is to the cantilever end, the smaller the overall density of the floor main body. In addition, the wedge-shaped structure of the floor main body causes the center of gravity of the floor main body to move significantly toward the fixed end, which can reduce the bending moment load generated by the deadweight of the floor main body. Moreover, fewer autoclaved aerated concrete blocks 6 are used near the fixed end, retaining more cast-in-place ordinary concrete to ensure its strength and bearing capacity. This arrangement of the autoclaved aerated concrete blocks 6 is in line with the stress conditions of the floor.

[0036] The upper ends of the rectangular steel pipe piles 4 are inserted into the top slab 1 to connect the buttress wall 3 and the top slab 1 .

[0037] The angle between the bottom plate 2 and the buttress wall 3 is no more than 95 degrees, that is, the uplift of the bottom plate 2 relative to the horizontal plane is no more than 5 degrees. On the one hand, this is to avoid the thickness of the fixed end of the floor slab being too large. On the other hand, the uplift is almost imperceptible to the naked eye when looking up at the floor slab from below, and does not affect the visual experience.

[0038] The construction method of the large cantilevered thermal insulation floor comprises the following steps: Step 1, such as Figure 7 and Figure 8 As shown, with the bottom plate 2 horizontal and the buttress wall 3 inclined, the buttress wall formwork 7 and the bottom plate formwork 8 are supported. Compared with the supporting method in which the buttress wall 3 is vertical and the bottom plate 2 is inclined, the difficulty of finding the slope of the bottom plate formwork 8 over a large area is avoided. Only the bottom plate formwork 8 needs to be supported horizontally on the plane. Since the buttress wall 3 has a small area, finding the slope is easy, which greatly reduces the difficulty of supporting the formwork. When supporting the formwork, a scaffolding can be built under the bottom plate formwork 8 to support the padding, or the bottom plate formwork 8 can be supported on the ground, and a sinking groove can be dug under the buttress wall 3 to support the buttress wall formwork 7; After the template is set up, the bottom plate steel cage 9 is tied on the bottom plate template 8, and the buttress wall steel cage 10 is tied inside the buttress wall template 7. When tying the buttress wall steel cage 10, installation holes for the steel pipe piles are reserved at the positions of the rectangular steel pipe piles 4, and connecting steel bars connected to the supporting wall are reserved at the bottom of the buttress wall 3; the steel cage can be prefabricated or tied on site.

[0039] After step 2, buttress wall 3 and bottom plate reinforcement cage 9 are completed, rectangular square pipe pile is inserted into the mounting hole of buttress wall reinforcement cage 10, guarantee that the bottom of rectangular square pipe pile is in good contact with buttress wall 3 bottom template, avoid concrete blocking the lower end of rectangular steel pipe pile 4 during casting; then steel beam 5 is laid on bottom plate reinforcement cage 9, and one end of steel beam 5 is inserted into the plug-in hole of rectangular steel pipe pile 4 sidewalls near buttress wall 3, available pad can carry out auxiliary support and height adjustment to steel beam 5; rectangular steel pipe pile 4 position is adjusted and welded fixed with buttress wall reinforcement cage 10, steel beam 5 position is adjusted and welded fixed with bottom plate reinforcement cage 9, avoid rectangular steel pipe pile 4 and steel beam 5 displacement during casting.

[0040] Step three, lay the autoclaved aerated concrete blocks 6 on the bottom plate steel cage 9, and the laying density gradually increases from the fixed end of the bottom plate 2 to the cantilever end, and then implant the prefabricated filling steel cage 11 into the gap of the autoclaved aerated concrete blocks 6, and tie it to the bottom plate steel cage 9; the prefabricated steel cage can limit the autoclaved aerated concrete blocks 6 to avoid displacement of the autoclaved aerated concrete blocks 6 when pouring concrete; the height of the prefabricated steel cage is equal to or higher than the height of the autoclaved aerated concrete blocks 6, so that it can be tied and connected with the top plate steel cage 13.

[0041] Step 4: Figure 9 and Figure 10 As shown, the bottom slab concrete and the buttress wall concrete are poured and waited to solidify and form, and the pouring height is to submerge two-thirds of the autoclaved aerated concrete blocks 6; the buttress wall concrete and the bottom slab concrete are poured and formed at one time.

[0042] Step 5: Hoist the integrally formed bottom plate 2 and buttress wall 3 above the supporting wall. The top of the supporting wall is pre-embedded with columns corresponding to the rectangular steel pipe piles 4 and connecting steel bars, so that the buttress wall 3 is aligned with the supporting wall, and the columns are inserted into the rectangular steel pipe piles 4 from the bottom of the buttress wall 3 in a one-to-one correspondence. A post-casting strip space is reserved between the bottom of the buttress wall 3 and the top of the supporting wall to temporarily support and position the buttress wall 3 and the bottom plate 2; after hoisting in place, the buttress wall 3 is in a vertical state, and the cantilevered ends of the bottom plate 2 and the cantilevered ends of the steel beam 5 are both in an upturned state.

[0043] Step 6, the connecting steel bar at the bottom of the buttress wall 3 is tied with the connecting steel bar at the top of the supporting wall, and the post-cast strip template is set up, and then the post-cast strip concrete is poured. After the post-cast strip concrete is poured, concrete is poured from the top of the rectangular steel pipe pile 4 into the rectangular steel pipe pile 4 immediately. After the concrete is formed, the buttress wall 3 and the bottom plate 2 are assembled and fixed with the supporting wall; the rectangular steel pipe pile 4 cooperates with the column and concrete column therein to limit the buttress wall 3 and the floor slab to anti-overturning, which can greatly reduce the load burden at the buttress wall 3 and the supporting wall post-cast strip.

[0044] Step seven, such as Figure 11 and Figure 12 As shown, a top slab side formwork 12 is supported above the bottom slab 2, and the bottom slab 2 serves as the bottom formwork of the top slab 1. Then the prefabricated top slab reinforcement cage 13 is hoisted onto the bottom slab 2. The top slab reinforcement cage 13 is wedge-shaped in the same manner as the top slab 1, and the bottom of the top slab reinforcement cage 13 is tied to the filling reinforcement cage 11, and the end is tied to the buttress wall reinforcement cage 10.

[0045] Step eight, such as Figure 13 and Figure 14 As shown, the top slab concrete is poured, and after the concrete is formed, the formwork is removed and the construction is completed; the top slab 1 serves as the surface layer of the floor slab, plays a leveling role, and serves as the foundation for the later ground construction.

[0046] In steps 1, 3, and 7, use spacers to raise and level the steel cage.

[0047] In step 4, before pouring concrete, the upper end of the rectangular steel pipe pile 4 is sealed to prevent concrete from entering the rectangular steel pipe pile 4. The upper end of the rectangular steel pipe pile 4 can be covered with a cover plate or filled with cloth.

[0048] During the above construction, the application of the formwork release agent, the vibration during concrete pouring, the soaking of the autoclaved aerated concrete blocks 6, etc., are all carried out in accordance with conventional construction requirements.

[0049] If higher aesthetic requirements are taken into account, or requirements for roof levelness during lamp installation and subsequent decorative construction, the lower surface of the bottom plate 2 can be decoratively leveled by hanging the ceiling.

[0050] The present invention greatly reduces the risk of cracking at the fixed end of the floor slab and forms an implicit diagonal bracing effect on the floor slab, which can effectively resist the sagging tendency of the cantilevered end of the floor slab, significantly improve the bearing capacity and stability of the floor slab, and avoid the visible diagonal bracing affecting the visual perception of the building; the construction process of the present invention greatly reduces the difficulty of construction.

Claims

1. An assembled large cantilevered thermal insulation floor, characterized in that: The floor comprises a top plate (1), a bottom plate (2) and a buttress wall (3), wherein the buttress wall (3) is connected to the lower side of one end of the bottom plate (2), and the bottom plate (2) and the buttress wall (3) form an angle greater than (90) degrees; the top plate (1) is located above the bottom plate (2), the lower surface of the top plate (1) has the same slope as the bottom plate (2), and the upper surface is horizontal, and the top plate (1) and the bottom plate (2) together form the main body of the floor; The buttress wall (3) is provided with pre-buried rectangular steel pipe piles (4), the floor slab body is provided with steel beams (5) having the same slope as the bottom slab (2), the rectangular steel pipe piles (4) are provided with plug holes for inserting the ends of the steel beams (5), and the fixed ends of the steel beams (5) are inserted into the rectangular steel pipe piles (4); the rectangular steel pipe piles (4) and the steel beams (5) are evenly distributed in a plurality of groups along the direction of the wall.

2. The assembled large cantilevered thermal insulation floor according to claim 1, characterized in that: Autoclaved aerated concrete blocks (6) are embedded in the main body of the floor slab.

3. The assembled large cantilevered thermal insulation floor according to claim 2, characterized in that: The closer to the cantilevered end of the floor slab body, the greater the arrangement density of the autoclaved aerated concrete blocks (6).

4. The assembled large cantilevered thermal insulation floor according to claim 1, characterized in that: The upper end of the rectangular steel pipe pile (4) is inserted into the top layer plate (1).

5. The assembled large cantilevered thermal insulation floor according to claim 1, characterized in that: The angle between the bottom plate (2) and the buttress wall (3) is no greater than 95 degrees.

6. A construction method for an assembled large cantilevered thermal insulation floor, characterized in that: The floor slab is the floor slab according to any one of claims 1 to (5), comprising the following steps: Step 1: With the bottom plate (2) horizontal and the buttress wall (3) inclined, support the buttress wall formwork (7) and the bottom plate formwork (8); After the template is set up, the bottom plate steel cage (9) is tied on the bottom plate template (8), and the pile wall steel cage (10) is tied inside the pile wall template (7). When tying the pile wall steel cage (10), a mounting hole for the steel pipe pile is reserved at the position of the rectangular steel pipe pile (4), and a connecting steel bar connected to the supporting wall is reserved at the bottom of the pile wall (3); Step 2: After the buttress wall (3) and the bottom plate reinforcement cage (9) are completed, the rectangular square pipe pile is inserted into the installation hole of the buttress wall reinforcement cage (10); then the steel beam (5) is laid on the bottom plate reinforcement cage (9), and the end of the steel beam (5) close to the buttress wall (3) is inserted into the plug hole of the side wall of the rectangular steel pipe pile (4); Step 3: Lay the autoclaved aerated concrete blocks (6) on the bottom plate steel cage (9), with the laying density gradually increasing from the fixed end to the cantilever end of the bottom plate (2), and then implant the prefabricated filling steel cage (11) into the gap of the autoclaved aerated concrete blocks (6) and tie it to the bottom plate steel cage (9); Step 4: pour the bottom slab concrete and the wall concrete and wait for them to solidify and form, pouring the concrete to a height that submerges two-thirds of the autoclaved aerated concrete blocks (6); Step 5: hoist the integrally formed bottom plate (2) and the buttress wall (3) above the supporting wall, pre-embed the top of the supporting wall with columns corresponding to the rectangular steel pipe piles (4) and connecting steel bars, align the buttress wall (3) with the supporting wall, and insert the columns into the rectangular steel pipe piles (4) from the bottom of the buttress wall (3) in a one-to-one correspondence, and reserve a post-casting strip space between the bottom of the buttress wall (3) and the top of the supporting wall, so as to temporarily support and position the buttress wall (3) and the bottom plate (2); Step 6: Tie the connecting steel bars at the bottom of the buttress wall (3) to the connecting steel bars at the top of the supporting wall, set up the post-casting strip template, and then pour the post-casting strip concrete. After the post-casting strip concrete is poured, immediately pour concrete from the top of the rectangular steel pipe pile (4) into the rectangular steel pipe pile (4). After the concrete is formed, the buttress wall (3) and the bottom plate (2) are assembled and fixed to the supporting wall. Step seven, supporting the top plate side formwork (12) above the bottom plate (2), the bottom plate (2) serving as the bottom formwork of the top plate (1), then hoisting the prefabricated top plate steel cage (13) onto the bottom plate (2), and tying the bottom of the top plate steel cage (13) to the filling steel cage (11), and tying the end to the buttress wall steel cage (10); Step 8: pour the top slab concrete, remove the formwork after the concrete is formed, and the construction is completed; The construction method of an assembled large cantilevered insulated floor according to claim 6 is characterized in that in steps one, three and seven, spacers are used to raise and level the steel cage.

7. The construction method of a prefabricated large cantilevered thermal insulation floor according to claim 6, characterized in that: In step 4, before pouring concrete, the upper end of the rectangular steel pipe pile (4) is closed.

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