CN110485609B - Combined prefabricated floor slab for low-rise assembled steel structure house - Google Patents
Combined prefabricated floor slab for low-rise assembled steel structure house Download PDFInfo
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- CN110485609B CN110485609B CN201910609144.XA CN201910609144A CN110485609B CN 110485609 B CN110485609 B CN 110485609B CN 201910609144 A CN201910609144 A CN 201910609144A CN 110485609 B CN110485609 B CN 110485609B
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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
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
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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
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/023—Separate connecting devices for prefabricated floor-slabs
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Abstract
The invention discloses a combined prefabricated floor slab for a low-rise fabricated steel structure house, belongs to the technical field of buildings, and relates to a combined prefabricated floor slab for a low-rise fabricated steel structure house, can realize the quick connection of the precast slabs through the connecting piece, technicians start the rotating magnetic field by wireless signals to drive the installation action of the magnetic bolts, realize the seamless assembly of the precast slabs and pre-implant prestressed reinforcements in the precast slabs, under the two-way memory effect of the shape memory alloy, the high-strength expansion connection is realized, so that the transmission and sharing of the prestress are completed, the assembly strength between the prefabricated plates is improved, meanwhile, the disassembly is finished by using wireless signals during the recycling, the nondestructive recycling of the prefabricated plate is basically realized, the direct secondary utilization can be realized, the assembly efficiency is obviously improved, meanwhile, the construction cost is reduced, and the green environmental protection concept of the current social sustainable development is met.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a combined prefabricated floor slab for a low-rise fabricated steel structure house.
Background
The steel structure house refers to a house building using steel as a building bearing beam column, and has the advantages that: 1. the house built by the steel structure has the weight about 1/2 of a reinforced concrete house; the requirement of a large bay of the house is met, and the use area is improved by about 4 percent compared with that of a reinforced concrete house. 2. Safe reliability, good earthquake resistance and wind resistance. 3. The steel structural member is manufactured in a factory, so that the field workload is reduced, the construction period is shortened, and the industrialization requirement is met. 4. The steel structure factory manufacturing quality is reliable, the size is accurate, the installation is convenient, and the steel structure factory manufacturing device is easy to be matched with related parts. 5. The steel can be recycled, and the environmental pollution is less during construction and dismantling.
At present, the floor system used in the steel structure mainly comprises: cast-in-place slab, profiled steel plate concrete composite board, steel bar truss concrete laminated plate body, prefabricated prestressed concrete laminated plate body and the like. The cast-in-place slab needs on-site formwork support, has complex working procedures and cannot be matched with the construction speed of a steel structure. The profiled steel sheet concrete compoboard is connected with the steel beam through the profiled steel sheet and serves as a template used in concrete pouring, working procedures are saved, ceiling treatment is often needed due to the fact that the bottom of the profiled steel sheet is uneven, decoration cost is increased, and meanwhile the profiled steel sheet is not strong in rust prevention and corrosion resistance and fire resistance. The steel bar truss concrete laminated slab ties the steel bars in the slab into a truss, and uses the profiled steel sheet as a template, so that the workload of steel bar binding on site can be reduced, the steel bars are arranged neatly, the construction quality is improved, and after concrete pouring is finished, a slab body is formed, so that the steel bar truss concrete laminated slab has good overall performance and anti-seismic performance, but has the same problems as the profiled steel sheet. The prefabricated prestressed concrete laminated plate body takes a concrete thin plate as a bottom film, and a later poured concrete surface layer forms a whole, so that the whole stress performance is intact, but a lot of wet operations still exist in the construction process, and the construction is not very convenient.
With the development of modern industrial technology, building houses can be manufactured in batches and sets like machine production. The prefabricated house components are transported to a construction site to be assembled. Fabricated buildings have become of interest since the beginning of the 20 th century and have been realized through the sixties. The first attempts made in English, French, Soviet Union, etc. The assembly type building has high construction speed and low production cost, and is rapidly popularized and developed all over the world.
The assembled building is mainly characterized in that:
1. a large number of building parts are produced and processed by workshops, and the types of components mainly comprise: external wall panel, interior wallboard, superimposed sheet, balcony, air conditioner board, stair, precast beam, precast column etc..
2. A large amount of assembly operation on site is greatly reduced compared with the original cast-in-place operation.
3. The building and decoration integrated design and construction are adopted, and the ideal state is that decoration can be synchronously carried out along with main body construction.
4. Standardization of design and informatization of management, the more standard the component, the higher the production efficiency, corresponding component cost will descend, and the cost performance of whole fabricated building will be higher and higher to cooperate the digital management of mill.
5. Meets the requirements of green buildings.
6. Energy conservation and environmental protection.
However, many temporary low-rise steel structure houses exist in China at present, such as the requirements of Olympic villages and temporary houses at that time, the operation efficiency and the cost are generally taken as the preferred items, so that the low-rise assembled steel structure houses are quite in line, after the prefabricated slabs are transported to a construction site, permanent assembly is mostly adopted for pursuing the connection strength, for example, post-cast concrete belts are adopted for connection, and later-period disassembly can only be forcibly pushed down and is difficult to integrally recover, so that direct secondary utilization cannot be carried out, the waste of resources is caused, and the environment-friendly concept of sustainable development of the current society is not met.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a combined prefabricated floor slab with a low-level assembly type steel structure for a house, which can realize the quick connection of prefabricated slabs through a connecting piece, realize the seamless assembly of the prefabricated slabs by starting a rotating magnetic field through a wireless signal of a technician to drive the installation action of a magnetic bolt, realize the high-strength expansion connection with prestressed steel bars pre-implanted in the prefabricated slabs under the two-way memory effect of a shape memory alloy, further finish the transmission and the sharing of the prestress, improve the assembly strength between the prefabricated slabs, simultaneously finish the disassembly by using the wireless signal during the recovery, basically realize the lossless recovery of the prefabricated slabs, realize the direct reutilization, remarkably improve the assembly efficiency and reduce the building cost, and accord with the green and environment-friendly concept of the sustainable development of the current society.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A combined prefabricated floor slab for a low-rise assembly type steel structure house comprises a prefabricated slab and a connecting piece, wherein a plurality of displacement cavities which are uniformly distributed are drilled on the connecting piece, a rotary magnetic field generator is installed in each displacement cavity, a plurality of through holes are drilled at the left end and the right end of the connecting piece and communicated with the displacement cavities, matched magnetic bolts are arranged in the displacement cavities and comprise magnetic heads and screw rod parts, the magnetic heads are in clearance fit with the displacement cavities, a plurality of fixing grooves are drilled at one ends, close to the connecting piece, of the prefabricated slab, pre-embedded stainless steel sleeves are fixedly connected in the fixing grooves, threaded holes matched with the screw rod parts are drilled in the pre-embedded stainless steel sleeves, a plurality of positioning grooves are drilled in the inner end walls of the displacement cavities and distributed in an annular array manner, and electric push rods are installed in the positioning grooves, the output end of the electric push rod is fixedly connected with a positioning rod, the outer end of the magnetic head is provided with a plurality of limited movement grooves matched with the positioning rod, the rotary magnetic field generator and the electric push rod are respectively provided with a first wireless signal receiver and a second wireless signal receiver which can realize the quick connection of the prefabricated plates through connecting pieces, technicians start the installation action of the rotary magnetic field to drive the magnetic bolts through wireless signals to realize the seamless assembly between the prefabricated plates and realize the high-strength expansion connection with the pre-implanted prestressed steel bars in the prefabricated plates under the two-way memory effect of the shape memory alloy, thereby completing the transmission and sharing of the prestress, improving the assembly strength between the prefabricated plates, simultaneously completing the disassembly by using wireless signals when in the recovery, basically realizing the lossless recovery of the prefabricated plates and realizing the direct secondary utilization, the assembly efficiency is obviously improved, the construction cost is reduced, and the environment-friendly concept of sustainable development of the current society is met;
the inner end of the precast slab is fixedly connected with a plurality of horizontally distributed prestressed reinforcements, the prestressed reinforcements are welded with the embedded stainless steel sleeve through a pair of metal reinforcing sheets, one end of the screw rod part, which is far away from the magnetic head part, is fixedly connected with an expansion block, one end of the prestressed reinforcements, which is close to the embedded stainless steel sleeve, is provided with a connecting groove in a chiseled mode, the expansion block is matched with the connecting groove, the magnetic bolt is connected with the prestressed reinforcements through the matching between the expansion block and the connecting groove, the transmission of prestress is completed, the seamless assembly between the precast slab and the connecting piece can be better realized, and the connecting strength is obviously;
the inner end of the expansion block is fixedly connected with a heat-conducting copper core, the inner end of the screw rod part is provided with a heating wire, the heating wire is connected with the heat-conducting copper core through a heat-conducting sheet, the outer end of the heating wire is wrapped with a heat-insulating sleeve, a power supply is arranged in the magnetic head part and is electrically connected with the heating wire, and a third wireless signal receiver is arranged on the power supply and is used for providing deformation temperature for the expansion block during later-stage disassembly and recovery, so that nondestructive disassembly and recovery are conveniently realized;
the magnetic head is made of a highly magnetic rare earth magnet, the outer end of the magnetic head is fixedly connected with a nano wear-resistant layer, wear-resistant steel balls are filled in the inner end of the nano wear-resistant layer, the diameter ratio of the thickness of the nano wear-resistant layer to the wear-resistant steel balls is 1:0.6-0.8, the wear-resistant steel balls extend out of the nano wear-resistant layer, the magnetic head has excellent magnetic field response characteristics, and can be screwed in a threaded hole under the action of a rotating magnetic field provided by a rotating magnetic field generator, so that the connection between a prefabricated plate and a connecting piece is realized;
the diameter of the magnetic head is 10-15cm, the diameters of the screw part and the expansion block are both 5-8cm, the length of the screw part is 15-20cm, the length ratio of the expansion block to the screw part is 1:4-8, the expansion block has high mechanical strength and mechanical property, the safety of use after assembly is improved, and the expansion block has long service life which can be recycled for multiple times;
the expansion block is made of Ti-Ni binary shape memory alloy, the balance temperature of the Ti-Ni binary shape memory alloy is 100-120 ℃, the Ti-Ni binary shape memory alloy has a two-way memory effect, the high-temperature phase shape is recovered during heating, the low-temperature phase shape can be recovered during cooling, the expansion block is in clearance fit with the connecting groove when being maintained in the high-temperature phase shape, and the expansion block is in interference fit with the connecting groove when being maintained in the low-temperature phase shape;
the precast slab is precast by lightweight concrete, and the lightweight concrete comprises the following components in parts by weight: 100 parts of a cementing material, 40-45 parts of water, 0.45-0.55 part of a water reducing agent, 10-15 parts of latex, 0.35-0.45 part of polyvinyl alcohol fiber and 60-80 parts of hollow glass beads, wherein the cementing material is prepared by loading nano aerogel with portland cement and fly ash, can improve the pore structure of concrete, refine and homogenize the pore diameter, and further improve the impermeability, freeze-thaw resistance and durability of the concrete; the silicon ash is a byproduct in large-scale industrial smelting, has small density and extremely strong volcanic ash effect, can improve the microstructure of slurry, improve the mechanical property and durability of a hardened body, the styrene-butadiene latex is added into light concrete as an additive to form a polymer film with a space net structure, is adsorbed on the interface of hollow glass microspheres and a cement hydration product structure, improves the bending strength of the material, enhances the fluidity, blocks the internal pore channels of the concrete, enhances the compactness, the polycarboxylic acid type high-efficiency water reducing agent can obtain higher water reducing rate with lower mixing amount, reduces the water-cement ratio, keeps better fluidity, has low slump loss, the polyvinyl alcohol fiber can enhance the bending resistance and the crack resistance of the concrete, the hollow glass microspheres are added as aggregates, not only can improve the strength and the heat insulation performance of the concrete, meanwhile, the density of the concrete can be reduced, so that the advantages of the lightweight concrete are more prominent;
the inner end of the prefabricated slab is also fixedly connected with a plurality of vertically distributed common steel bars, the common steel bars and the prestressed steel bars are welded together, the diameter ratio of the prestressed steel bars to the common steel bars is 1:0.6-0.8, the mechanical strength and the mechanical property of the prefabricated slab are improved, and the load bearing capacity is improved as much as possible on the premise of light weight;
the left end and the right end of the connecting piece are coated with annular gap-filling glue layers, the thickness of each annular gap-filling glue layer is 2-4mm, and the annular gap-filling glue layers are used for trowelling assembly gaps between the prefabricated plates and the connecting piece, so that the effect of isolation and protection is achieved on one hand, and the attractiveness of a finished product can be improved on the other hand;
functional layers are arranged at the outer ends of the prefabricated plate and the connecting piece, and the surface of each functional layer is coated with a decorative layer, so that technicians can select proper functional layers for construction according to actual conditions on site, individualized requirements under different environments can be met, and the decorative layers play a role in attractiveness.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can realize the quick connection of the prefabricated plates through the connecting piece, technicians start the installation action of the rotating magnetic field to drive the magnetic bolts through wireless signals, seamless assembly between the prefabricated plates is realized, the prefabricated plates and pre-implanted prestressed steel bars inside the prefabricated plates are connected through high-strength expansion under the two-way memory effect of the shape memory alloy, further, the transmission and sharing of the prestress are completed, the assembly strength between the prefabricated plates is improved, meanwhile, the disassembly is completed through the wireless signals when the prefabricated plates are recycled, basically, the lossless recycling of the prefabricated plates is realized, the direct secondary utilization can be realized, the assembly efficiency is obviously improved, the building cost is reduced, and the environment-friendly concept of sustainable development of the current society is met.
(2) The prestressing steel that a plurality of horizontal distributions of the inner fixedly connected with of prefabricated plate, the prestressing steel is in the same place through the welding of a pair of metal reinforcing piece and pre-buried stainless steel bushing, magnetic head one end fixedly connected with inflation piece is kept away from to the screw rod portion, the prestressing steel is close to pre-buried stainless steel bushing one end and has dug the spread groove, and inflation piece and spread groove phase-match, utilize cooperation between inflation piece and the spread groove to realize being connected between magnetic bolt and the prestressing steel, accomplish the transmission of prestressing force, and then can better realize the seamless equipment between prefabricated plate and the connecting piece, and show improvement joint strength.
(3) The inner fixedly connected with heat conduction copper core of inflation piece, the heating wire is installed to screw rod portion the inner, and the heating wire passes through the conducting strip with heat conduction copper core and be connected, and the parcel of heating wire outer end has the radiation shield, installs the power in the magnetism head, and power and heating wire electric connection install the third radio signal receiver on the power for provide deformation temperature to the inflation piece when the later stage is dismantled to retrieve, conveniently realize harmless dismantlement and recovery.
(4) The magnetic head is made of a highly magnetic rare earth magnet material, the outer end of the magnetic head is fixedly connected with a nano wear-resistant layer, wear-resistant steel balls are filled in the inner end of the nano wear-resistant layer, the diameter ratio of the thickness of the nano wear-resistant layer to the wear-resistant steel balls is 1:0.6-0.8, the wear-resistant steel balls extend out of the nano wear-resistant layer, the magnetic head has excellent magnetic field response characteristics, and can be screwed in a threaded hole under the action of a rotating magnetic field provided by a rotating magnetic field generator, so that the prefabricated plate and the connecting piece are connected.
(5) The diameter of the magnetic head is 10-15cm, the diameters of the screw part and the expansion block are both 5-8cm, the length of the screw part is 15-20cm, the length ratio of the expansion block to the screw part is 1:4-8, and the magnetic expansion screw has high mechanical strength and mechanical property, so that the safety of use after assembly is improved, and the magnetic expansion screw has long service life and can be recycled for multiple times.
(6) The expansion block is made of Ti-Ni binary shape memory alloy, the balance temperature of the Ti-Ni binary shape memory alloy is 100-120 ℃, the Ti-Ni binary shape memory alloy has a two-way memory effect, the high-temperature phase shape is recovered during heating, the low-temperature phase shape can be recovered during cooling, the expansion block is in clearance fit with the connecting groove when being maintained in the high-temperature phase shape, and the expansion block is in interference fit with the connecting groove when being maintained in the low-temperature phase shape.
(7) The precast slab is precast by lightweight concrete, and the lightweight concrete comprises the following components in parts by weight: 100 parts of a cementing material, 40-45 parts of water, 0.45-0.55 part of a water reducing agent, 10-15 parts of latex, 0.35-0.45 part of polyvinyl alcohol fiber and 60-80 parts of hollow glass beads, wherein the cementing material is prepared by loading nano aerogel with portland cement and fly ash, the pore structure of concrete can be improved, the pore diameter is refined and homogenized, and the impermeability, freeze-thaw resistance and durability of the concrete are improved; the silicon ash is a byproduct in large-scale industrial smelting, has small density and extremely strong volcanic ash effect, can improve the microstructure of slurry, improve the mechanical property and durability of a hardened body, the styrene-butadiene latex is added into light concrete as an additive to form a polymer film with a space net structure, is adsorbed on the interface of hollow glass microspheres and a cement hydration product structure, improves the bending strength of the material, enhances the fluidity, blocks the internal pore channels of the concrete, enhances the compactness, the polycarboxylic acid type high-efficiency water reducing agent can obtain higher water reducing rate with lower mixing amount, reduces the water-cement ratio, keeps better fluidity, has low slump loss, the polyvinyl alcohol fiber can enhance the bending resistance and the crack resistance of the concrete, the hollow glass microspheres are added as aggregates, not only can improve the strength and the heat insulation performance of the concrete, meanwhile, the density of the concrete can be reduced, so that the advantages of the lightweight concrete are more prominent.
(8) The inner end of the prefabricated slab is also fixedly connected with a plurality of vertically distributed common steel bars, the common steel bars and the prestressed steel bars are welded together, the diameter ratio of the prestressed steel bars to the common steel bars is 1:0.6-0.8, the mechanical strength and the mechanical property of the prefabricated slab are improved, and the load bearing capacity is improved as much as possible on the premise of light weight.
(9) The left end and the right end of the connecting piece are coated with annular gap-filling glue layers, the thickness of each annular gap-filling glue layer is 2-4mm, and the annular gap-filling glue layers are used for trowelling assembly gaps between the prefabricated plates and the connecting piece, so that the effect of isolation and protection is achieved on one hand, and the attractiveness of finished products can be improved on the other hand.
(10) Functional layers are arranged at the outer ends of the prefabricated plates and the connecting piece, and the surface of each functional layer is coated with a decorative layer, so that technicians can select proper functional layers for construction according to actual conditions on site, individualized requirements under different environments can be met, and the decorative layers play a role in attractiveness.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view showing an assembled state of the prefabricated panel and the connecting member according to the present invention;
FIG. 3 is a schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural view of a magnetic bolt portion according to the present invention;
FIG. 5 is a schematic structural view of the present invention in a state of welding a prestressed reinforcement bar and a normal reinforcement bar;
FIG. 6 is a schematic structural diagram of the expansion block of the present invention when it is transformed from a high temperature phase shape to a low temperature phase shape.
The reference numbers in the figures illustrate:
the device comprises a prefabricated plate 1, a connecting piece 2, a rotary magnetic field generator 3, a magnetic bolt 4, a magnetic head 401, a screw rod 402, an expansion block 403, a pre-embedded stainless steel sleeve 5, a prestressed steel bar 6, a metal reinforcing sheet 7, a heat-conducting copper core 8, an electric heating wire 9, a heat-insulating sleeve 10, a power supply 11, an electric push rod 12, a positioning rod 13, a common steel bar 14, a connecting groove 15, a limited moving groove 16 and an annular gap-filling glue layer 17.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Example 1:
referring to fig. 1-4, a combined prefabricated floor slab for a low-rise assembly type steel structure house comprises a prefabricated slab 1 and a connecting piece 2, wherein the connecting piece 2 is made of stainless steel, a plurality of displacement cavities uniformly distributed are drilled on the connecting piece 2, a rotary magnetic field generator 3 is installed in each displacement cavity and generates a rotary huge magnetic field through current change, the rotary magnetic field generator 3 is the prior art, the structure and the circuit connection of the rotary magnetic field generator are not repeated, a plurality of through holes are drilled at the left end and the right end of the connecting piece 2 and communicated with the displacement cavities, matched magnetic bolts 4 are arranged in the displacement cavities, each magnetic bolt 4 comprises a magnetic head 401 and a screw rod part 402, the magnetic head 401 is in clearance fit with the displacement cavities, a plurality of fixing grooves are drilled at one end of the prefabricated slab 1, which is close to the connecting piece 2, pre-embedded stainless steel sleeves 5 are fixedly connected in the fixing grooves, threaded holes matched with the screw rod parts, through the connection between the screw part 402 and the threaded hole, the assembly between the precast slab 1 and the connecting piece 2 is further realized, a plurality of positioning grooves are formed in the inner end wall of the displacement cavity, the positioning grooves are distributed in an annular array manner, an electric push rod 12 is installed in each positioning groove, a positioning rod 13 is fixedly connected to the output end of the electric push rod 12, the electric push rod 12 provides power for driving the positioning rod 13 to stretch, a plurality of limiting grooves 16 matched with the positioning rods 13 are formed in the outer end of the magnetic head part 401, the matching between the positioning rods 13 and the limiting grooves 16 realizes the auxiliary improvement of the installation strength of the magnetic bolts 4, the probability of pressure damage of the screw part 402 is reduced, a first wireless signal receiver and a second wireless signal receiver are respectively installed on the rotary magnetic field generator 3 and the electric push rod 12, technicians can directly carry out remote control through corresponding wireless signal transmitters in the outside, and will not be described in detail herein.
Referring to fig. 3-4, the inner end of the prefabricated slab 1 is fixedly connected with a plurality of horizontally distributed prestressed reinforcements 6, which provide a shrinking prestressed force and improve the crack resistance and rigidity of the prefabricated slab 1, the prestressed reinforcements 6 are welded with the pre-embedded stainless steel sleeve 5 through a pair of metal reinforcing sheets 7, one end of the screw part 402, which is far away from the magnetic head 401, is fixedly connected with an expansion block 403, one end of the prestressed reinforcement 6, which is close to the pre-embedded stainless steel sleeve 5, is provided with a connecting groove 15, the expansion block 403 is matched with the connecting groove 15, the magnetic bolt 4 is connected with the prestressed reinforcement 6 by matching between the expansion block 403 and the connecting groove 15, so as to complete the transmission of the prestressed force, thereby better realizing the seamless assembly between the prefabricated slab 1 and the connecting piece 2, and obviously improving the connecting strength, the inner end of the expansion block 403 is fixedly connected, and heating wire 9 passes through the conducting strip with heat conduction copper core 8 and is connected, and the parcel of heating wire 9 outer end has insulation cover 10, installs power 11 in the magnetism head 401, and power 11 and heating wire 9 electric connection, installs the third radio signal receiver on the power 11 for when the later stage is dismantled to retrieve to provide deformation temperature to inflation piece 403, conveniently realize harmless dismantlement and retrieve.
Referring to fig. 4, a magnetic head 401 is made of a highly magnetic rare earth magnet, a nano wear-resistant layer is fixedly connected to the outer end of the magnetic head 401, wear-resistant steel balls are filled in the inner end of the nano wear-resistant layer, the diameter ratio of the thickness of the nano wear-resistant layer to the wear-resistant steel balls is 1:0.6, and the wear-resistant steel balls all extend out of the nano wear-resistant layer, the magnetic head 401 has excellent magnetic field response characteristics, can complete screwing action in a threaded hole under the action of a rotating magnetic field provided by a rotating magnetic field generator 3, and further realize connection between a prefabricated plate 1 and a connecting piece 2, the diameter of the magnetic head 401 is 10cm, the diameters of a screw part 402 and an expansion block 403 are both 5cm, the length of the screw part 402 is 15cm, and the length ratio: 8, the expansion block 403 has high mechanical strength and mechanical property, so that the safety of use after assembly is improved, and the expansion block has long service life which can be recycled for multiple times, the expansion block 403 is made of Ti-Ni binary shape memory alloy, the balance temperature of the Ti-Ni binary shape memory alloy is 100-120 ℃, the Ti-Ni binary shape memory alloy has a two-way memory effect, the high-temperature phase shape is recovered during heating, the low-temperature phase shape can be recovered during cooling, the expansion block 403 is in clearance fit with the connecting groove 15 when being maintained in the high-temperature phase shape, and the expansion block 403 is in interference fit with the connecting groove 15 when being maintained in the low-temperature phase shape.
Referring to fig. 2 and 5, the inner end of the prefabricated slab 1 is also fixedly connected with a plurality of vertically distributed ordinary steel bars 14, the ordinary steel bars 14 and the prestressed steel bars 6 are welded together, the diameter ratio of the prestressed steel bars 6 to the ordinary steel bars 14 is 1:0.6, the mechanical strength and the mechanical property of the prefabricated slab 1 are improved, and the load bearing capacity is improved as much as possible on the premise of light weight.
The precast slab 1 is precast by lightweight concrete, and the lightweight concrete comprises the following components in parts by weight: 100 parts of a cementing material, 45 parts of water, 0.55 part of a water reducing agent, 15 parts of latex, 0.45 part of polyvinyl alcohol fiber and 80 parts of hollow glass beads, wherein the cementing material is prepared by loading nano aerogel with portland cement and fly ash, so that the pore structure of concrete can be improved, the pore diameter is refined and homogenized, and the impermeability, freeze-thaw resistance and durability of the concrete are improved; the silicon ash is a byproduct in large-scale industrial smelting, has small density and extremely strong volcanic ash effect, can improve the microstructure of slurry, improve the mechanical property and durability of a hardened body, the styrene-butadiene latex is added into light concrete as an additive to form a polymer film with a space net structure, is adsorbed on the interface of hollow glass microspheres and a cement hydration product structure, improves the bending strength of the material, enhances the fluidity, blocks the internal pore channels of the concrete, enhances the compactness, the polycarboxylic acid type high-efficiency water reducing agent can obtain higher water reducing rate with lower mixing amount, reduces the water-cement ratio, keeps better fluidity, has low slump loss, the polyvinyl alcohol fiber can enhance the bending resistance and the crack resistance of the concrete, the hollow glass microspheres are added as aggregates, not only can improve the strength and the heat insulation performance of the concrete, meanwhile, the density of the concrete can be reduced, so that the advantages of the lightweight concrete are more prominent.
Referring to fig. 1, the left and right ends of the connecting member 2 are coated with the annular gap-filling adhesive layer 17, the thickness of the annular gap-filling adhesive layer 17 is 2-4mm, the annular gap-filling adhesive layer is used for leveling an assembly gap between the prefabricated panel 1 and the connecting member 2, on one hand, the annular gap-filling adhesive layer has an isolation and protection effect, on the other hand, the aesthetic property of a finished product can be improved, the outer ends of the prefabricated panel 1 and the connecting member 2 are provided with functional layers, the surface of the functional layers is coated with a finishing layer, technicians can select proper functional layers to construct according to actual conditions on site, such as a waterproof layer, a fireproof layer or a.
When assembling, a technician firstly transports a pair of prefabricated panels 1 to be connected and a connecting piece 2 to a construction site and assembles, after aligning the prefabricated panels 1 and the connecting piece 2, the technician starts a power supply 11 on site to electrify and heat an electric heating wire 9, the electric heating wire 9 transfers heat to a heat conducting copper core 8, the heat conducting copper core 8 uniformly heats an expansion block 403, when the expansion block 403 is heated to exceed a balance temperature, the expansion block 403 is deformed to a high-temperature phase shape, namely the diameter of the expansion block 403 is slightly smaller than that of a connecting groove 15, then the rotary magnetic field generator 3 is controlled to start to generate a forward rotary magnetic field, a magnetic head 401 is driven under the action of the magnetic field to drive a screw rod part 402 to synchronously rotate and is screwed into a threaded hole to realize installation, meanwhile, the expansion block 403 also maintains the high-temperature phase shape to enter the connecting groove 15, an electric push rod 12 is started to extend to push a positioning rod 13 to, after the auxiliary positioning is completed, the expansion block 403 recovers the low-temperature phase shape after being cooled, referring to fig. 6, the expansion block 403 is in interference fit with the connecting groove 15 after growing and expanding, so that the expansion connection between the magnetic bolt 4 and the prestressed reinforcement 6 is realized, the transmission of the prestress is effectively realized, and the assembling strength between the prefabricated slab 1 and the connecting piece 2 is improved.
When the prefabricated plate 1 needs to be recycled after the service life is over, technicians activate a disassembly program through a wireless signal transmitter, and sequentially send signals to a second wireless signal receiver, a third wireless signal receiver and a first wireless signal receiver, namely, an electric push rod 12 firstly shortens a drive positioning rod 13 to leave a limiting groove 16, so that the magnetic head 401 is unlocked, then an electric heating wire 9 is electrified to generate heat to force an expansion block 403 to deform to a high-temperature phase state, and finally a rotary magnetic field generator 3 is started to generate a reverse rotary magnetic field, and the expansion block is reversely screwed out of a threaded hole during installation, so that lossless disassembly is basically completed, only a functional layer and a decorative finish layer need to be damaged, and the recycling cost is low.
The invention can realize the quick connection of the precast slabs 1 through the connecting piece, technicians start the installation action of the rotating magnetic field to drive the magnetic bolts 4 through wireless signals, realize the seamless assembly of the precast slabs 1, and realize the high-strength expansion connection with the pre-implanted prestressed steel bars 6 in the precast slabs 1 under the two-way memory effect of the shape memory alloy, thereby completing the transmission and sharing of the prestress, improving the assembly strength of the precast slabs 1, simultaneously completing the disassembly by using the wireless signals during the recycling, basically realizing the lossless recovery of the precast slabs 1, realizing the direct secondary utilization, remarkably improving the assembly efficiency, reducing the construction cost and conforming to the green environmental protection concept of the sustainable development of the current society.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (1)
1. The utility model provides a combined precast floor slab for low-rise assembled steel structure house, includes prefabricated plate (1) and connecting piece (2), its characterized in that: the prefabricated slab comprises a connecting piece (2), wherein a plurality of uniformly distributed displacement cavities are drilled in the connecting piece (2), rotary magnetic field generators (3) are installed in the displacement cavities, a plurality of through holes are drilled in the left end and the right end of the connecting piece (2) and communicated with the displacement cavities, matched magnetic bolts (4) are arranged in the displacement cavities, each magnetic bolt (4) comprises a magnetic head (401) and a screw rod part (402), the magnetic head (401) is in clearance fit with the displacement cavities, a plurality of fixing grooves are drilled in one end, close to the connecting piece (2), of the prefabricated slab (1), pre-embedded stainless steel sleeves (5) are fixedly connected in the fixing grooves, threaded holes matched with the screw rod parts (402) are drilled in the pre-embedded stainless steel sleeves (5), a plurality of positioning grooves are drilled in the inner end wall of the displacement cavities, the positioning grooves are distributed in an annular array, and electric push rods (12, the output end of the electric push rod (12) is fixedly connected with a positioning rod (13), a plurality of limited movement grooves (16) matched with the positioning rod (13) are formed in the outer end of the magnetic head (401), and a first wireless signal receiver and a second wireless signal receiver are respectively installed on the rotary magnetic field generator (3) and the electric push rod (12);
the inner end of the precast slab (1) is fixedly connected with a plurality of horizontally distributed prestressed reinforcements (6), the prestressed reinforcements (6) are welded with the embedded stainless steel sleeve (5) through a pair of metal reinforcing sheets (7), one end, far away from the magnetic head (401), of the screw rod part (402) is fixedly connected with an expansion block (403), one end, close to the embedded stainless steel sleeve (5), of each prestressed reinforcement (6) is provided with a connecting groove (15) in a chiseling mode, and the expansion block (403) is matched with the connecting groove (15);
the inner end of the expansion block (403) is fixedly connected with a heat-conducting copper core (8), the inner end of the screw rod part (402) is provided with an electric heating wire (9), the electric heating wire (9) is connected with the heat-conducting copper core (8) through a heat-conducting sheet, the outer end of the electric heating wire (9) is wrapped with a heat insulation sleeve (10), a power supply (11) is arranged in the magnetic head part (401), the power supply (11) is electrically connected with the electric heating wire (9), and a third wireless signal receiver is arranged on the power supply (11);
the magnetic head (401) is made of a high-magnetism rare earth magnet material, the outer end of the magnetic head (401) is fixedly connected with a nano wear-resistant layer, wear-resistant steel balls are filled in the inner end of the nano wear-resistant layer, the diameter ratio of the thickness of the nano wear-resistant layer to the wear-resistant steel balls is 1:0.6-0.8, and the wear-resistant steel balls extend out of the nano wear-resistant layer;
the diameter of the magnetic head (401) is 10-15cm, the diameters of the screw part (402) and the expansion block (403) are both 5-8cm, the length of the screw part (402) is 15-20cm, and the length ratio of the expansion block (403) to the screw part (402) is 1: 4-8;
the expansion block (403) is made of Ti-Ni binary shape memory alloy, and the balance temperature of the Ti-Ni binary shape memory alloy is 100-120 ℃;
the precast slab (1) is precast by lightweight concrete, and the lightweight concrete comprises the following components in parts by weight: 100 parts of a cementing material, 40-45 parts of water, 0.45-0.55 part of a water reducing agent, 10-15 parts of latex, 0.35-0.45 part of polyvinyl alcohol fiber and 60-80 parts of hollow glass beads, wherein the cementing material is prepared by loading nano aerogel with portland cement and fly ash;
the inner end of the precast slab (1) is also fixedly connected with a plurality of vertically distributed common steel bars (14), the common steel bars (14) and the prestressed steel bars (6) are welded together, and the diameter ratio of the prestressed steel bars (6) to the common steel bars (14) is 1: 0.6-0.8;
the left end and the right end of the connecting piece (2) are coated with annular gap-filling glue layers (17), and the thickness of each annular gap-filling glue layer (17) is 2-4 mm;
the outer ends of the precast slab (1) and the connecting piece (2) are provided with functional layers, and the surfaces of the functional layers are coated with finish coat layers.
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| CN111287315B (en) * | 2020-02-10 | 2021-02-19 | 湖南省西城建设有限公司 | Ultrahigh-performance concrete prefabricated part and preparation method thereof |
| CN112482590B (en) * | 2020-10-28 | 2022-07-01 | 中铁第一勘察设计院集团有限公司 | Prefabricated externally-hung wallboard splicing piece of assembled that T style of calligraphy steel sheet socket joint is fixed |
| CN112482588A (en) * | 2020-10-28 | 2021-03-12 | 中铁第一勘察设计院集团有限公司 | Prefabricated externally-hung wallboard splicing piece of fixed assembled of cross steel sheet socket joint |
| CN113931319B (en) * | 2021-09-15 | 2022-11-11 | 南京天固建筑科技有限公司 | Prefabricated part |
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Effective date of registration: 20210128 Address after: 755000 opposite the village headquarters of Damao village, Yongkang Town, Shapotou District, Zhongwei City, Ningxia Hui Autonomous Region Applicant after: Ningxia Shenju steel structure installation engineering Co.,Ltd. Address before: 138000 No.85 Changhua street, Changshan Town, Qianguo County, Songyuan City, Jilin Province Applicant before: Mu Yunpeng |
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