CN111441523A - Hollow slab filled with breathable box and provided with movable counterweight - Google Patents
Hollow slab filled with breathable box and provided with movable counterweight Download PDFInfo
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- CN111441523A CN111441523A CN202010390689.9A CN202010390689A CN111441523A CN 111441523 A CN111441523 A CN 111441523A CN 202010390689 A CN202010390689 A CN 202010390689A CN 111441523 A CN111441523 A CN 111441523A
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- ventilation
- box
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 114
- 229910052742 iron Inorganic materials 0.000 claims abstract description 55
- 238000010276 construction Methods 0.000 claims abstract description 21
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000009423 ventilation Methods 0.000 claims description 78
- 239000000463 material Substances 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- 239000000378 calcium silicate Substances 0.000 claims description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims 6
- 238000005266 casting Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000007667 floating Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 230000001737 promoting effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/326—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C1/00—Building elements of block or other shape for the construction of parts of buildings
- E04C1/24—Elements for building-up floors, ceilings, roofs, arches, or beams
- E04C1/34—Elements for building-up floors, ceilings, roofs, arches, or beams designed for use as filling elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to a hollow slab filled with a ventilating box and provided with a movable balance weight and a construction method thereof, belonging to the field of general building structures. This hollow slab (1) is including iron (2) on the board, iron (3) under the board, ventilative case (4), concrete (5) and activity counter weight (6), ventilative case is located between iron and the iron under the board on the board, be solid rib (7) between the adjacent ventilative case, ventilative case is last, the lower part is last flange (8) and bottom flange (9) of hollow slab respectively, ventilative net (10) are installed to the bottom of ventilative case, there are intensive mesh (11) in the ventilative net, there are gap (12) or exhaust hole (13) at side or top of ventilative case, when vibrator (14) vibrate solid rib or last flange concrete, iron upper portion is equipped with the activity counter weight on the board in vibrator influence area (15). The hollow slab has the advantages of large span, light weight, high construction efficiency, good structural reliability, and good economical efficiency and applicability.
Description
(I) technical field
The invention relates to a cast-in-place concrete hollow floor structure, in particular to a hollow slab filled with a ventilating box and provided with a movable balance weight and a construction method thereof, belonging to the field of common building structures.
(II) background of the invention
In the field of construction, as large-span concrete structures are increasing day by day, more and more floors adopt the hollow floor structure technology. The light filling material is used for replacing part of concrete, the stress performance of the structure is basically not influenced, and the self weight of the structure can be greatly reduced. The hollow slab with the built-in filler comprises an upper flange and a lower flange, and has the best mechanical property and the widest application. According to the Archimedes law, in a common built-in filling body hollow slab, a filling material inevitably generates larger buoyancy when concrete is poured; in order to overcome the buoyancy, holes must be drilled in the template in order to resist the buoyancy in the construction, the buoyancy is transmitted to the bottom of the template by using tie pieces such as iron wires, and the anti-buoyancy measures are expensive, labor-consuming, time-consuming and damage the template. In order to overcome the buoyancy of a filling material, the Wangben (R) 2815678 provided a technology of 'cast-in-place hollow floor slab formed by holes by using a combined net-shaped box-shaped component' (CN203514592U) in 2013, and later Guwu and I also provided a technology of 'a combined metal filling box with a slurry sheet' (CN205063134U) and a 'light material filling box with a metal net surface layer' (CN105239708A) respectively, wherein the technologies play a promoting role in promoting the application of the breathable filling box in the hollow floor slab.
However, the above-described technique has the following drawbacks: (1) if the mesh size is bigger on the ventilative case, it is comparatively obvious to subtract and floats the effect, can not adopt special anti-floating measure in the construction, but the mesh size leads to when concreting the slurry to permeate the ventilative case easily, has both increased the superstructure dead weight and has leaded to the bearing capacity to reduce, has destroyed the concrete grading again and has reduced the concrete intensity and influence structure safety. (2) If the mesh size on the ventilation box is smaller, the floating reduction effect is not obvious, an anti-floating measure still needs to be adopted in the construction, and although the workload of anti-floating is greatly reduced compared with the traditional hollow slab, the anti-floating process of drilling holes on the template still exists after all.
In the prior art, the floating reducing effect and the concrete pouring quality are in a pair of contradictions, and under the condition, the development of a novel hollow slab technology which has the advantages of small buoyancy of a filling material, capability of ensuring the concrete pouring quality and simple anti-floating construction process in the concrete pouring process becomes a problem to be solved urgently in the industry.
Disclosure of the invention
Aiming at the contradiction between the floating reduction effect and the concrete pouring quality in the existing hollow floor system technology, the inventor uses a common filling box and different forms of ventilation boxes to carry out a large amount of scientific research and experiments, and obtains the following original conclusion on the basis of the experiments: 1. the hollow ventilating box can achieve the purpose of reducing buoyancy as long as dense meshes with proper sizes are distributed at the bottom of the box body, and the vent holes are formed in the top of the box body to prevent the air pressure difference from forming inside and outside the box body. 2. When the concrete is in a vibrating state, the buoyancy reduction degree of the ventilating box is limited to the upper limit and cannot be completely zero, and the buoyancy is reduced by 80% at most in the test. 3. The large quantity of dense meshes arranged on the top and the side wall of the box body has no benefit on reducing buoyancy, but the concrete is easy to flow into the ventilation box, and the structure safety is influenced. 4. For the ventilation box, when the mesh at the bottom is large to a certain size, the buoyancy is generated only when the vibrating rod acts, and the buoyancy is generated only within the influence range of the vibrating rod; when the vibrating rod stops vibrating, the buoyancy value of the air permeable box can be zero.
The invention aims to provide a hollow slab technology which has the advantages that the buoyancy of a filling material is small in the concrete pouring process, the concrete pouring quality can be guaranteed, and the anti-floating construction process is simple. On the basis of experimental research, in order to achieve the purpose, the technical scheme adopted by the invention is as follows: a hollow slab with a movable counterweight is filled by a ventilating box, and comprises an upper iron plate, a lower iron plate, a ventilating box, concrete and a movable counterweight, wherein the upper iron plate, the lower iron plate and the ventilating box are all poured in the concrete, the ventilating box is positioned between the upper iron plate and the lower iron plate, solid ribs are arranged between adjacent ventilating boxes, the upper part and the lower part of the ventilating box are respectively an upper flange and a lower flange of the hollow slab, a ventilating net is arranged at the bottom of the ventilating box, dense meshes are arranged in the ventilating net, the width of the meshes is more than or equal to 4mm and less than or equal to 15mm, gaps or exhaust holes are formed in the side surface or the top of the ventilating box, when a vibrating device vibrates the concrete with the solid ribs or the upper flange, the upper iron plate in the area influenced by the vibrating device is provided with the movable counterweight, and the movable counterweight can be removed after each area vibrates. The bottom of the ventilation box is provided with a ventilation net, dense meshes are arranged in the ventilation net, the width of the meshes is more than or equal to 4mm and less than or equal to 15mm, gaps or exhaust holes are arranged on the side surface or the top of the ventilation box to prevent the air pressure difference from forming inside the box body, and the purpose of reducing the buoyancy can be achieved; and a large amount of dense meshes are not arranged on the top and the side wall of the box body, so that the concrete can be prevented from flowing into the ventilation box, and the structural safety is not influenced. According to concrete materials science, concrete is a liquid before initial setting (initial setting time is generally 2-4 hours), and even if the theoretical buoyancy is reduced by the ventilating box, the Archimedes' law still applies. The research results of the inventor also prove that: as long as the concrete keeps a liquid state, the buoyancy value of the common filling box is kept unchanged whether the concrete is vibrated or not, namely, the Archimedes' law is completely effective. However, the research results of the inventor simultaneously disclose: however, for the ventilating box, the archimedes' law is only effective when the concrete is in a dynamic state (namely when the vibrating device vibrates), and the effective area is limited to a small range of the impact area of the vibrating device (in the test of the inventor, the impact area of the vibrating device is related to the size and the power of the vibrating device, for example, the impact radius of a 30mm vibrating rod is less than or equal to 600mm, the impact radius of a 50mm vibrating rod is less than or equal to 1000mm, and the impact radius of a flat plate type vibrator is larger). Therefore, when the vibrating device vibrates the concrete of the solid rib or the upper flange during the concrete pouring of the hollow slab, the movable counter weight is arranged on the upper part of the upper iron of the slab in the affected area, and the movable counter weight can be removed after the vibrating of each area is finished, wherein the counter weight is a movable load with short duration and small action range.
The invention is characterized in that when the hollow slab is poured with concrete, the movable balance weight can move along with the movement of the vibrating devices, and in the influence area of each vibrating device, the weight of the movable balance weight is more than or equal to 10 percent of the theoretical buoyancy of the filling material in the hollow slab in the area and less than or equal to 50 percent of the theoretical buoyancy. The movable balance weight can move along with the movement of the vibrating device, so that each vibrating device only needs to be matched with one set of movable balance weight, and the cost of the balance weight can be greatly saved. According to the Archimedes law, the theoretical buoyancy is the volume of a filling box and the volume weight of concrete-the self weight of the filling box, and for a common hollow slab, the balance weight must be more than 100% of the theoretical buoyancy of the filling box to ensure that a filling material cannot float upwards; the research results of the inventor show that: on the premise of ensuring the concrete pouring quality, the actual measurement buoyancy of the ventilating box in the concrete vibrating state can be reduced by 80% at most compared with the theoretical buoyancy, so that the ventilating box can be prevented from floating as long as the theoretical buoyancy of the ventilating box is greater than 20%, and the lower limit of the movable counterweight value is 10% of the theoretical buoyancy by considering that the dead weight of the iron steel bar on the hollow slab is equivalent to a permanent counterweight. When the mesh size of the air box is small and the floating reduction state is not optimal, the impact force influence of the vibrating rod during vibrating is considered, and the upper limit value of the balance weight is 50% of the theoretical buoyancy.
The invention is characterized in that the movable counterweight is a cylindrical object capable of rolling. The cylindrical object capable of rolling makes things convenient for the movable counter weight to move fast on the hollow slab, improves the efficiency of construction.
The invention is characterized in that the movable counterweight is provided with a handle, and the movable counterweight can freely move on the plate iron by applying external force on the handle. No matter the movable counter weight of circular or rectangle or other shapes, add the handle after, make things convenient for the operator to remove the counter weight, improve the efficiency of construction equally.
The invention is characterized in that the material of the breathable net at the bottom of the breathable box is metal or plastic. The metal breathable net can adopt a steel wire net, an expansion net or an open net; the breathable web of plastic material is typically a plastic web.
The invention is characterized in that the air-permeable box is of an assembled structure, the top panel and the side panel of the air-permeable box are made of metal plates, cement plates, calcium silicate plates or plastic plates, and gaps exist at the splicing positions of at least two different panels. For the assembled ventilation box, even if different panels are formed by folding the same piece of material, at most 4 panels can be directly connected, at most 3 connecting lines among the panels can be ensured to be closed, gaps are inevitably formed at other splicing positions of the different panels as long as sealing glue is not used for plugging, the gaps can ensure that the inside of the ventilation box is communicated with the atmosphere, and the effect of reducing buoyancy is not influenced due to the formation of air pressure difference.
The invention is characterized in that the top panel and the side panel of the ventilation box are integrally cast and molded by a mold, the top panel and the side panel are made of plastic materials, the top panel is provided with exhaust holes, the corresponding parts of the exhaust holes are provided with not less than 1 mesh, and the width of a single mesh is more than or equal to 1mm and less than or equal to 8 mm. For the ventilation box integrally cast by the top panel and the side panel, the sealing performance of the upper structure is good, and a special exhaust hole is required to be arranged for eliminating the air pressure difference. The mesh is arranged at the corresponding part of the exhaust hole, and the mesh material can be cast and molded simultaneously with the same material as the top panel; the mesh material can be made of other materials, and is arranged at the corresponding part on the inner side of the exhaust hole or in the hole or on the outer side when the ventilation box is manufactured. The width of a single mesh is more than or equal to 1mm and less than or equal to 8mm, so that air circulation is ensured, and concrete is prevented from seriously leaking.
The invention is characterized in that the top or the bottom of the ventilation box is provided with a chamfer or chamfer. Eliminate the right angle at ventilative roof portion, can alleviate the inside concrete stress concentration's of hollow core slab degree, the chamfer or the chamfer of ventilative bottom of the case portion, it is closely knit to be convenient for ventilative bottom of the case portion concrete placement.
The invention relates to a construction method for filling a hollow slab with a movable counterweight by a ventilation box, which comprises the following steps: the hollow slab comprises upper iron, lower iron, a ventilation box, concrete and a movable counterweight, wherein the upper iron, the lower iron and the ventilation box are all poured in the concrete, the ventilation box is positioned between the upper iron and the lower iron, solid ribs are arranged between adjacent ventilation boxes, the upper part and the lower part of the ventilation box are respectively an upper flange and a lower flange of the hollow slab, a ventilation net is arranged at the bottom of the ventilation box, dense meshes are arranged in the ventilation net, the width of the meshes is more than or equal to 4mm and less than or equal to 15mm, gaps or exhaust holes are formed in the side surface or the top of the ventilation box, when the vibration device vibrates the solid ribs or the upper flange concrete, the upper part of the upper iron in the area influenced by the vibration device is provided with the movable counterweight, and the movable counterweight can be removed after the vibration of each area is finished.
The construction method for filling the hollow slab with the movable counter weight by the ventilation box is characterized in that when the hollow slab is used for pouring concrete, the movable counter weight can move along with the movement of the vibrating devices, and in an influence area of each vibrating device, the weight of the movable counter weight is more than or equal to 10% of the theoretical buoyancy of the filling material in the hollow slab in the area and less than or equal to 50% of the theoretical buoyancy.
After adopting the scheme, compared with the prior art, the invention has the following beneficial effects:
compared with the conventional hollow slab filled with the box, the hollow slab filled with the ventilation box and provided with the movable balance weight can avoid drilling on the template, save a complex anti-floating construction process, save construction cost and accelerate construction speed; compared with the air permeable box hollow plate which does not need anti-floating completely, although the movable counter weight is additionally arranged, the increased workload is very small, and concrete leakage is avoided, so that the structural safety can be better ensured. The hollow slab filled with the ventilation box and provided with the movable counter weight has the advantages of large span, light weight, high construction efficiency and good structural reliability. The invention has good economical efficiency and applicability, and plays a role in promoting the development of building technology.
(IV) description of the drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a vertical cross-section of a hollow core slab according to the present invention.
Fig. 2 is a plan view of the air-permeable net in the air-permeable box.
Fig. 3 is a plan view of an expanded mesh.
FIG. 4 is a side view of the sectional ventilation box.
FIG. 5 is a vertical cross-sectional view of a one-piece cast breather box.
FIG. 6 is a schematic view of the area of influence of the vibrating rod.
Fig. 7 is a schematic view of a cylindrical movable weight configuration.
Fig. 8 is a schematic view of a rectangular movable weight configuration.
Figure 9 is a schematic view of a venting box with a chamfer or chamfer.
In the figure: 1. the concrete structure comprises a hollow slab, 2 parts of slab upper iron, 3 parts of slab lower iron, 4 parts of a ventilation box, 5 parts of concrete, 6 parts of a movable balance weight, 7 parts of a solid rib, 8 parts of an upper flange, 9 parts of a lower flange, 10 parts of a ventilation net, 11 parts of meshes, 12 parts of gaps, 13 parts of exhaust holes, 14 parts of a vibrating device, 15 parts of an influence area, 16 parts of a handle, 17 parts of a top panel, 18 parts of a side panel, 19 parts of a cutting angle and 20 parts of a chamfer angle.
(V) detailed description of the preferred embodiments
The invention is realized by the following modes:
in the embodiment shown in fig. 1-6, a hollow slab with movable weights is filled by a ventilation box, the hollow slab (1) comprises an upper slab iron (2), a lower slab iron (3), a ventilation box (4), concrete (5) and a movable weight (6), the upper slab iron, the lower slab iron and the ventilation box are all poured in the concrete, the ventilation box is positioned between the upper slab iron and the lower slab iron, a solid rib (7) is arranged between adjacent ventilation boxes, the upper part and the lower part of the ventilation box are respectively an upper flange (8) and a lower flange (9) of the hollow slab, a ventilation net (10) is arranged at the bottom of the ventilation box, dense meshes (11) are arranged in the ventilation net, the mesh width is more than or equal to 4mm and less than or equal to 15mm, a gap (12) or an exhaust hole (13) is arranged on the side surface or the top of the ventilation box, during the concrete pouring of the hollow slab, when a vibrating device (14) vibrates the solid rib or the upper flange concrete, the upper part of the iron plate in the area (15) affected by the vibrating device is provided with a movable counter weight, and the movable counter weight can be removed after each area is vibrated.
In the embodiment shown in figures 1 and 6, when the hollow slab (1) is cast with concrete (5), the movable counter weight (6) can move along with the movement of the vibrating devices (14), and in the influence area (15) of each vibrating device, the weight of the movable counter weight is more than or equal to 10% of the theoretical buoyancy of the filling material in the hollow slab in the area and less than or equal to 50% of the theoretical buoyancy.
In the embodiment shown in fig. 1 and 7, the movable weight (6) is a cylindrical object capable of rolling.
In the embodiment shown in fig. 1, 7 and 8, the movable weight (6) is provided with a handle (16), and the movable weight can freely move on the plate iron (2) by exerting external force on the handle.
In the embodiment shown in fig. 1-5 and 9, the air-permeable net (10) at the bottom of the air-permeable box (4) is made of metal or plastic.
In the embodiment shown in fig. 1 and 4, the air permeable box (4) is of a split mounting type structure, the top panel (17) and the side panels (18) of the air permeable box are made of metal plates, cement plates, calcium silicate plates or plastic plates, and gaps (12) are formed at the splicing positions of at least two different panels.
In the embodiment shown in fig. 1, 5 and 9, the top panel (17) and the side panel (18) of the ventilation box (4) are integrally cast and molded by a mold, the top panel and the side panel are made of plastic materials, the top panel is provided with the exhaust holes (13), the corresponding parts of the exhaust holes are provided with not less than 1 mesh (11), and the width of a single mesh is more than or equal to 1mm and less than or equal to 8 mm.
In the embodiment shown in fig. 9, the top or bottom of the box (4) has a chamfer (19) or chamfer (20).
In the embodiment shown in fig. 1-6, a construction method for filling a hollow slab with a movable weight by an air permeable box is as follows: the hollow slab (1) comprises an upper slab iron (2), a lower slab iron (3), a ventilation box (4), concrete (5) and a movable counterweight (6), wherein the upper slab iron, the lower slab iron and the ventilation box are all poured in the concrete, the ventilation box is positioned between the upper slab iron and the lower slab iron, a solid rib (7) is arranged between adjacent ventilation boxes, and the upper part and the lower part of the ventilation box are respectively an upper flange (8) and a lower flange (9) of the hollow slab, the bottom of the ventilation box is provided with a ventilation net (10), dense meshes (11) are arranged in the ventilation net, the width of the meshes is more than or equal to 4mm and less than or equal to 15mm, there are gaps (12) or air vents (13) on the sides or top of the air box, when the vibrator (14) vibrates the concrete of the solid rib or upper flange during the concrete pouring of the hollow slab, the upper part of the iron plate in the area (15) affected by the vibrating device is provided with a movable counter weight, and the movable counter weight can be removed after each area is vibrated.
In the embodiment shown in fig. 1 and 6, a construction method for filling a hollow slab with a movable weight by an air permeable box comprises the following steps: when concrete (5) is poured on the hollow plate (1), the movable counter weight (6) can move along with the movement of the vibrating devices (14), and in an influence area (15) of each vibrating device, the weight of the movable counter weight is more than or equal to 10% of the theoretical buoyancy of the filling material in the hollow plate in the area and less than or equal to 50% of the theoretical buoyancy.
Claims (10)
1. A hollow slab with movable counterweights is filled by a ventilation box, the hollow slab (1) comprises upper slab iron (2), lower slab iron (3), the ventilation box (4), concrete (5) and movable counterweights (6), the upper slab iron, the lower slab iron and the ventilation box are all poured in the concrete, the hollow slab is characterized in that the ventilation box is positioned between the upper slab iron and the lower slab iron, solid ribs (7) are arranged between adjacent ventilation boxes, the upper part and the lower part of the ventilation box are respectively an upper flange (8) and a lower flange (9) of the hollow slab, a ventilation net (10) is installed at the bottom of the ventilation box, dense meshes (11) are arranged in the ventilation net, the mesh width is more than or equal to 4mm and less than or equal to 15mm, gaps (12) or exhaust holes (13) are arranged on the side surfaces or the top of the ventilation box, when the solid ribs or the upper flange concrete are vibrated by a vibrating device (14), the movable counterweights are arranged on the upper part of the upper slab iron in an influence area (15) of the vibrating device during concrete pouring of the hollow slab, the movable balance weight can be removed after each area is vibrated.
2. A void board filled with a movable weight by a ventilation box according to claim 1, wherein the movable weight (6) is movable with the movement of the vibrating tamper (14) when the void board (1) is filled with concrete (5), and the weight of the movable weight in the area (15) affected by each vibrating tamper is 10% or more and 50% or less of the theoretical buoyancy of the filling material in the void board.
3. A void board with movable weight filled by a ventilated box according to claim 1, characterized in that the movable weight (6) is a cylindrical object capable of rolling.
4. A void board with movable weight filled by ventilated box according to claim 1, characterized in that the movable weight (6) has a handle (16) to allow free movement of the movable weight on the board iron (2) by applying an external force on the handle.
5. The hollow slab filled with the movable weights by the air permeable box according to claim 1, characterized in that the air permeable net (10) at the bottom of the air permeable box (4) is made of metal or plastic.
6. The hollow slab filled with the ventilation boxes and provided with the movable weights as claimed in claim 1, wherein the ventilation boxes (4) are of an assembled structure, the top panels (17) and the side panels (18) of the ventilation boxes are made of metal plates, cement plates, calcium silicate plates or plastic plates, and gaps (12) exist at the splicing positions of at least two different panels.
7. The hollow slab filled with the ventilation box and provided with the movable balance weight according to claim 1 is characterized in that a top panel (17) and a side panel (18) of the ventilation box (4) are integrally cast and molded by a mold, the top panel and the side panel are made of plastic materials, the top panel is provided with exhaust holes (13), the corresponding parts of the exhaust holes are provided with not less than 1 mesh (11), and the width of a single mesh is more than or equal to 1mm and less than or equal to 8 mm.
8. A void board with movable weight filled by a ventilation box according to claim 1, characterized in that the top or bottom of the ventilation box (4) has a chamfer (19) or chamfer (20).
9. The construction method of a slab filled with a movable weight by a ventilation box according to claim 1, characterized in that the slab (1) comprises a slab upper iron (2), a slab lower iron (3), a ventilation box (4), concrete (5) and a movable weight (6), the slab upper iron, the slab lower iron and the ventilation box are all cast in the concrete, the ventilation box is positioned between the slab upper iron and the slab lower iron, a solid rib (7) is arranged between adjacent ventilation boxes, the upper part and the lower part of the ventilation box are respectively an upper flange (8) and a lower flange (9) of the hollow slab, a ventilation net (10) is installed at the bottom of the ventilation box, dense meshes (11) are arranged in the ventilation net, the mesh width is more than or equal to 4mm and less than or equal to 15mm, a gap (12) or an exhaust hole (13) is arranged at the side surface or the top of the ventilation box, during the concrete casting of the hollow slab, when the solid rib or upper flange concrete is vibrated by a vibrating device (14), the upper part of the iron plate in the area (15) affected by the vibrating device is provided with a movable counter weight, and the movable counter weight can be removed after each area is vibrated.
10. The construction method for filling a hollow slab with a movable weight by a gas permeable box according to claim 1 is characterized in that when the hollow slab (1) is poured with concrete (5), the movable weight (6) can move along with the movement of the vibrating devices (14), and in the influence area (15) of each vibrating device, the weight of the movable weight is more than or equal to 10% of the theoretical buoyancy of the filling material in the hollow slab in the area and less than or equal to 50% of the theoretical buoyancy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010390689.9A CN111441523A (en) | 2020-05-08 | 2020-05-08 | Hollow slab filled with breathable box and provided with movable counterweight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010390689.9A CN111441523A (en) | 2020-05-08 | 2020-05-08 | Hollow slab filled with breathable box and provided with movable counterweight |
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| Publication Number | Publication Date |
|---|---|
| CN111441523A true CN111441523A (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010390689.9A Pending CN111441523A (en) | 2020-05-08 | 2020-05-08 | Hollow slab filled with breathable box and provided with movable counterweight |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203514592U (en) * | 2013-07-26 | 2014-04-02 | 王本淼 | Cast-in-place hollow floor achieving pore forming through a combined mesh box-shaped component |
| CN105220815A (en) * | 2015-10-23 | 2016-01-06 | 徐焱 | A kind of with bottom gas-permeable nets and the filling box of upper discharge hole |
| CN105297981A (en) * | 2015-11-24 | 2016-02-03 | 徐焱 | Hollow floor filled by breathable box |
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