CN108868011B - Turnover fine control fastening assembly - Google Patents
Turnover fine control fastening assembly Download PDFInfo
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- CN108868011B CN108868011B CN201810720392.7A CN201810720392A CN108868011B CN 108868011 B CN108868011 B CN 108868011B CN 201810720392 A CN201810720392 A CN 201810720392A CN 108868011 B CN108868011 B CN 108868011B
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- 230000007306 turnover Effects 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 137
- 239000010959 steel Substances 0.000 claims abstract description 137
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 42
- 238000011065 in-situ storage Methods 0.000 abstract description 28
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 20
- 239000011241 protective layer Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000002411 adverse Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 23
- 238000010276 construction Methods 0.000 description 16
- 230000002787 reinforcement Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 239000004570 mortar (masonry) Substances 0.000 description 8
- 239000004579 marble Substances 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 108010068370 Glutens Proteins 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 235000021312 gluten Nutrition 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention discloses a turnover fine control fastening assembly which comprises a welded steel pipe, wherein the top of the welded steel pipe is connected with a steel bar circular ring, a vertical groove is formed in the welded steel pipe, an M8 hook bolt is connected in the vertical groove, an M8 nut is connected on the M8 hook bolt, and a steel fastener is connected at the bottom of the welded steel pipe. The invention replaces the traditional protective layer cushion block and the reinforcing steel bar split heads by the turnover general reinforcing steel bar protective layer fastening component, not only can accurately control the deformation of the stressed ribs of the upper layer and the lower layer of the cast-in-situ slab and ensure that the thickness of the cast-in-situ slab reinforcing steel bar protective layer meets the standard, but also can be circulated in a turnover way, meet the use of different plate thicknesses, has strong universality, can save a large number of reinforcing steel bars, can reduce the manufacturing cost by nearly 2 yuan per square meter, saves energy and protects the environment while reducing the manufacturing cost, completely accords with the green building concept, has no influence on the structure itself, and does not produce adverse effects on the structural safety.
Description
Technical Field
The invention relates to the technical field of cast-in-situ slab construction, in particular to a turnover precise control fastening assembly.
Background
The thickness of the reinforcement protection layer relates to the safety of the concrete structure, relates to the bearing capacity, durability, fireproof performance and other performances of the structure, and is an important detection index in the inspection of structural entities. The annex E of the acceptance specification of the construction quality of the concrete structure engineering GB50204-2015 defines the structural part, the number of components and the inspection method for inspecting the thickness of the reinforcement protection layer, and the allowable deviation of the thickness of the longitudinal stress reinforcement protection layer of the plate component is +8, -5.
At present, the common practice of controlling the cast-in-situ slab reinforcement protection layer on a construction site is as follows: the lower part of the slab bottom rib is supported by using a mortar cushion block, a marble cushion block or a plastic cushion block; the lower part of the plate gluten is provided with a 'H' -shaped supporting iron or a 'H' -shaped reinforcing bar split heads for supporting reinforcing bars and controlling the thickness of a reinforcing bar protection layer, and the technology has a plurality of problems in practical operation.
The pad of the reinforcing steel bar mortar at the bottom of the slab has small contact area and low strength, and is easy to shift and damage under the action of load. The application technical specification of the reinforcing steel bar spacer for the concrete structure is set in the 4.1.3 th item in JGJ/T219-2010: "cement-based steel bar spacer cement mortar strength should not be lower than 20Mpa; the concrete strength of the concrete spacer should be one level higher than the concrete strength grade of the member and should not be lower than C30. The mortar cushion blocks are manufactured on site, the proportion is random, the mortar strength is generally difficult to meet the requirement, the stress is extremely easy to break, the thickness of the protective layer is out of control, and the phenomena of exposed steel bars, concrete cracks and the like are caused.
The marble cushion block has a flat and smooth surface, is difficult to bind with the steel bars firmly and is easy to slip; meanwhile, the surface of the marble is closely adhered to the template, so that the marble cannot be wrapped by cement paste, and the marble is exposed after the mold is removed, and the appearance of the component is affected; and the marble cushion blocks are mostly leftover materials of stone processing factories, the thickness is uneven, the size is different, the randomness is larger when the marble cushion blocks are used on site, and the thickness uniformity of the reinforcement protection layer is difficult to ensure.
The plastic cushion block has very insufficient strength and stability, the bearing capacity is low, and the concrete strength at the distribution position is weak; the plastic has poor binding power with concrete, no compatibility, and the contact surface is permeable to water and air, which is easy to cause component leakage and affects the safety of the main structure; the plastic cushion blocks pollute the environment and are difficult to decompose when being processed, and the plastic cushion blocks do not accord with the low-carbon, energy-saving, environment-friendly and green building concepts.
The steel bar that board upper layer reinforcing bar adopted props iron or leads to long split heads, often can be because of self quality problem, constructor tramples or factors such as quantity is not enough, and the support is unstable and makes the reinforcing bar sag, causes upper layer reinforcing bar protective layer thickness too big, causes the effective height of board to not reach the design requirement, causes the quality hidden danger.
The spacers for controlling the reinforcement protection layers are disposable, the consumed construction cost is quite considerable, and particularly, a large amount of reinforcement is required to be consumed in the traditional reinforcement split heads, so that the engineering cost is increased, the price of the purchased finished reinforcement split heads is higher, and the construction input cost is about 2 yuan/m < 2 >.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a turnover fine control tightening assembly which can overcome the defects in the prior art.
In order to achieve the above-mentioned technical object, the technical scheme of the invention is realized as follows:
the utility model provides a turnover fine control tight subassembly, includes the welded steel pipe, the top of welded steel pipe be connected with the reinforcing bar ring, be equipped with vertical groove on the welded steel pipe, vertical inslot connection has M8 eave tile bolt, be connected with M8 nut on the M8 eave tile bolt, the bottom of welded steel pipe is connected with the steel firmware.
Further, a wedge-shaped cushion block and a steel gasket are arranged between the welded steel pipe and the M8 nut.
Furthermore, the steel firmware is L-shaped.
Further, the groove width of the vertical groove is 10mm.
Further, the included angle between the M8 hook bolt and the horizontal plane is 45 degrees, and the included angle between the upper notch connecting line of the vertical grooves at two sides of the welded steel pipe and the horizontal plane and the included angle between the lower notch connecting line and the horizontal plane are both 45 degrees.
Furthermore, the steel bar ring is stuck with a reflective film.
The invention has the beneficial effects that: the invention replaces the traditional protective layer cushion block and the reinforcing steel bar split heads by the turnover general reinforcing steel bar protective layer fastening component, not only can accurately control the deformation of the stressed ribs of the upper layer and the lower layer of the cast-in-situ slab and ensure that the thickness of the cast-in-situ slab reinforcing steel bar protective layer meets the standard, but also can be circulated in a turnover way, meet the use of different plate thicknesses, has strong universality, can save a large number of reinforcing steel bars, can reduce the manufacturing cost by nearly 2 yuan per square meter, saves energy and protects the environment while reducing the manufacturing cost, completely accords with the green building concept, has no influence on the structure itself, and does not produce adverse effects on the structural safety.
The invention has the advantages of simple manufacture, available local materials, simple and convenient field installation, reliable support, quick disassembly, firmness and durability, simplified construction procedures, improved working efficiency, accurate thickness of the reinforcing steel bar protection layer to millimeter by adjusting the elevation of the fastening bolt, ensured construction precision, promotion of integral improvement of the quality of the cast-in-situ reinforced concrete structural engineering and good popularization value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of an epicyclic fine fastening assembly according to embodiments of the present invention;
in the figure: 1. a steel bar circular ring; 2. welding the steel pipe; 3. vertical direction a groove; 4. m8 hook bolt; 5. an M8 screw cap; 6. wedge-shaped cushion blocks; 7. a steel gasket; 8. steel firmware; 9. lower iron of the upper layer of the plate; 10. and (3) the lower layer of the plate is provided with iron below the ribs.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
As shown in fig. 1, the turnover fine control tightening assembly according to the embodiment of the invention comprises a welded steel pipe 2, wherein the top of the welded steel pipe 2 is connected with a steel bar circular ring 1, a vertical groove 3 is formed in the welded steel pipe 2, an M8 hook bolt 4 is connected in the vertical groove 3, an M8 nut 5 is connected on the M8 hook bolt 4, and the bottom of the welded steel pipe 2 is connected with a steel fastener 8.
In a specific embodiment, a wedge-shaped cushion block 6 and a steel gasket 7 are arranged between the welded steel pipe 2 and the M8 nut 5.
In one embodiment, the steel fastener is L-shaped.
In a specific embodiment, the width of the vertical groove 3 is 10mm.
In a specific embodiment, the included angle between the M8 hook bolt 4 and the horizontal plane is 45 °, and the included angle between the upper notch connecting line and the horizontal plane and the included angle between the lower notch connecting line and the horizontal plane of the vertical grooves 3 at two sides of the welded steel pipe 2 are both 45 °.
In one embodiment, the reinforced bar ring 1 is adhered with a reflective film.
In order to facilitate understanding of the above technical solutions of the present invention, the following describes the above technical solutions of the present invention in detail by a specific usage manner.
According to the turnover fine control fastening assembly, a welded steel pipe 2, a steel fixing piece 8, an M8 hook bolt 4, a nut 5, a wedge-shaped cushion block 6 and a steel bar ring 1 are combined to manufacture the turnover fine control fastening assembly, the welded steel pipe 2 is used as a cast-in-situ plate stress steel bar supporting member, a vertical groove 3 formed in the welded steel pipe 2 is used as a fine adjustment component for adjusting the position of a steel bar, the steel fixing piece 8 welded at the lower part of the steel pipe is used as a fixing piece of a lower plate layer steel bar 10, the M8 hook bolt 4 penetrating through the welded steel pipe 2 is used as a fixing piece of an upper plate layer steel bar lower plate 9, and the phi 8 steel bar ring 1 welded at the top of the steel pipe is used as a component for rotationally disassembling the fastening assembly.
When the steel pipe is actually used in site, the phi 8 steel bar support plate bottom stress bar welded at the lower part of the steel pipe is used as a fixing piece for controlling the plate bottom bar protection layer according to the thicknesses of the cast-in-situ plate and the steel bar protection layer; then, a vertical groove 3 is formed in the welded steel pipe 2, the elevation of an M8 hook bolt 4 is adjusted, the lower iron 9 of the upper layer of the plate rib is hooked and positioned at a designed position, a wedge-shaped cushion block 6 is sleeved to screw a screw cap 5 to lock the position of the stressed steel bar on the top of the plate, and therefore the accuracy of the protection layer of the plate gluten is ensured; when the cast-in-situ slab concrete is subjected to secondary surface collecting before initial setting, the M8 hook bolt 4 is unscrewed, lifted through the steel pipe vertical groove 3, separated from the lower steel bar 9 on the upper layer of the slab, inserted into the steel bar circular ring 1 at the top of the steel pipe by using the short steel bar, rotated by 90 degrees to separate the lower steel bar fixing part 8 from the lower steel bar 9 on the lower layer of the slab, and the assembly is vertically taken out, so that the mortar is circularly used after being cleaned, the turnover can be repeated, a large number of steel bar consumption is reduced, and the construction cost is saved.
The invention can be generally used for controlling the reinforcing steel bar protection layer of the cast-in-situ plate with the thickness of 100-180 mm, and the cast-in-situ plate with the thickness of more than 180mm can be satisfied by lengthening the steel pipe. The hook bolt elevation is adjusted through the vertical slotting of the steel pipe according to different plate thicknesses, steel bar diameters and steel bar protection layer thicknesses on site, so that the hook bolt elevation hooks the plate top stress bar, and then the screw cap is screwed tightly, so that the rapid accurate control locking of the plate top stress bar position can be completed, the structure is simple, and the operation is rapid.
The process steps for construction by using the turnover fine control fastening assembly are as follows: manufacturing a protective layer fastening assembly, field installation during binding of plate steel bars, quality inspection and acceptance, and cast-in-situ pouring plate concrete, dismantling and taking out during secondary surface collecting, cleaning and recycling next time.
Wherein, the manufacturing steps of the turnover fine control tightening component are as follows:
1. cutting out 1 steel pipe with 265mm length, welding 1 steel fastener at 15mm (refer to structural design) from the bottom of the steel pipe, bending the steel fastener by adopting phi 8 steel bars, and welding the steel fastener with the double sides of the steel pipe and the welding seam of 5mm, wherein the steel fastener is in an L shape and has the size of 20 x 30 mm;
2. the grooves are vertically cut and formed in two symmetrical sides of the side wall of the steel pipe, the groove width is 10mm, and the M8 hook bolt can move up and down freely, so that the steel pipe is universally used for different plate thicknesses of 100-180 mm, and the positions and the lengths of the vertical groove openings are calculated as follows:
in order to make the hook bolt bear the vertical load of the reinforcing steel mesh to achieve a good stress state, the included angle between the hook head bolt and the horizontal plane is 45 degrees, namely, the connecting line of the upper opening and the lower opening corresponding to the vertical notch at the two sides of the pipe wall forms 45 degrees with the horizontal plane;
assuming a minimum plate thickness h=100 mm, a reinforcement diameter d=10 mm, and a protective layer thickness c=15 mm, the calculation method is established according to the plate thickness, the reinforcement diameter, and the protective layer thickness as follows:
the lower edge of the lower iron of the mesh sheet at the top layer of the plate is at a height distance of 10+10+15=35 mm from the top of the plate, the lower mouth of the lower end groove of the steel pipe is at a distance of = (5 ≡2+5) +2=17 mm from the lower edge of the lower iron of the mesh sheet at the top layer of the plate, and the lower mouth of the lower end groove of the steel pipe is at a distance of 100- (35-17) =82 mm from the bottom end of the steel pipe; the distance between the lower opening of the groove at the higher end of the steel pipe and the lower edge of the iron of the top mesh sheet=25+3.25+17=45 mm, and the distance between the lower opening of the groove at the higher end of the steel pipe and the lower edge of the iron of the top mesh sheet is 100-35+45=110 mm;
assuming that the maximum plate thickness h=180 mm and other elements are unchanged, the position of the hook bolt is shifted upwards by 80mm relative to the plate thickness of 100mm, and the vertical slotting length of the steel pipe is 90mm in consideration of the diameter and manufacturing error of the hook bolt, so that the distance between the upper opening of the lower end slot of the steel pipe and the bottom end of the steel pipe is=82+90=172 mm; the distance between the upper opening of the groove at the higher end of the steel pipe and the bottom end of the steel pipe is 110 plus 90 minus 200mm;
in summary, in the region of 100-180 mm thickness, the position of the hook bolt on the outer wall of the steel pipe can be deduced according to the following formula:
the lower edge of the lower end of the hook bolt is distant from the bottom of the plate by the distance of =h-c-2d+ (v2 d/2+d/2) ×v 2=h-c-d+ [ v 2d/2 mm)
The distance of the high end lower edge of the cap screw from the bottom of the plate=h-c-2d+ (v2 d/2+d/2)/(v 2+ (25+3.25 x 2) =h-c-d + v2 d/2+31.5 mm)
Wherein: h, plate thickness, d, diameter of upper layer stress steel bar, and c, thickness of steel bar protection layer;
3. preparing 1 branch of L=150mm M8 hook bolt; L=40mmM8 elongated nuts 11 steel gasket; 1 wedge-shaped cushion block, and pre-drilling bolt holes with the diameter of 10mm;
4. the top end of the steel pipe is welded with a steel bar circular ring which is bent by phi 8 steel bars, the inner diameter of the steel bar circular ring is 40mm, the steel bar circular ring is welded with the steel pipe by single-sided welding, the welding seam is 5mm, and a reflective film is stuck on the steel bar circular ring, so that the steel bar circular ring is convenient for constructors to pay attention to during construction at night;
5. the M8 hook bolt penetrates through the welded steel pipe vertical groove, the end head is sleeved with the wedge-shaped cushion block, the steel cushion block and the screw cap in sequence, and the cast-in-situ slab reinforcement protection layer turnover fine control fastening assembly is manufactured and assembled and can be put into field use according to different slab thicknesses.
In the concrete construction process, the adopted operation steps are as follows:
(1) The technical scheme is as follows: before the tightening assembly is installed, technical base exchange is carried out on the steel bar work, the using method of exchange is clear, the tightening assembly is installed close to the node of the steel bar net, the tightening assembly can be placed in an array mode or a quincuncial mode, and a rectangular array is generally preferred.
(2) Determining arrangement spacing: the longitudinal and transverse arrangement spacing of the fastening assembly is generally 1m, when the two-layer bidirectional plate ribs are phi 6-phi 8, encryption arrangement is needed, the longitudinal and transverse spacing is 600-800 mm, and when the two-layer bidirectional plate ribs are more than phi 12, the longitudinal and transverse spacing can be properly enlarged to 1200-1500 mm. The arrangement method is calculated and determined according to the diameters and the distances of the plate stress reinforcing steel bars when the plate is used on site, and the principle of reliability and moderate degree is followed.
(3) Determining the arrangement quantity: the site can be calculated according to floor area, the number of the used cast-in-situ plate areas/(the transverse distance and the longitudinal distance) is equal, when the stressed ribs on the plate top are only the support negative ribs, the cast-in-situ plate areas only calculate the coverage area of the support negative ribs, and the area of the beam is deducted.
(4) And (3) field installation: the fastening assembly is placed when the mesh of the bottom layer steel bars of the cast-in-situ slab is bound after the mesh of the top layer steel bars are bound, the lower row steel bars of the mesh of the bottom layer are placed on steel fasteners at the bottom end of the steel pipe, the elevation of the hook head screw bolts is adjusted through vertical slotting of the steel pipe according to the slab thickness and the thickness of the protective layer, the lower row steel bars of the mesh of the top layer are hooked and positioned at the design position, the screw caps are screwed to lock the stressed steel bars, and then the upper row steel bars of the mesh of the top layer are arranged and bound. The tightening assembly is placed in a vertical position during installation.
(5) Casting a cast-in-situ slab: the cast-in-situ slab adopts a commercial concrete pumping mould, the mould entering temperature should not be lower than 5 ℃ and should not be higher than 35 ℃. When the daily average air temperature reaches more than 30 ℃, adopting cooling measures according to the high-temperature construction requirement, and when the daily average air temperature is lower than 5 ℃ for 5 days, adopting winter construction measures. And stopping working aloft in strong wind weather with the level of more than 6, and prohibiting pouring concrete in rainy days.
Before casting cast-in-situ slab concrete, a field quality inspector performs quality inspection on the slab bottom elevation, the reinforcement condition of the template and the scaffold, the binding installation quality of the reinforcing steel bars and the placement condition of the tightly fixed components, and then the inspection and acceptance are performed after the design and specification requirements are met. When casting cast-in-situ slab concrete, because the top of the fastening component extends out of the cast-in-situ slab surface by a certain height, constructors should pay special attention to not trample the component or stumble by the component in the construction of casting and receiving the slab, direct impact during pumping concrete is avoided, and a vibrating rod is also avoided from touching the component during vibration.
(6) And (3) removing the fine tuning control: and after the cast-in-situ slab is poured, the tightening assembly is disassembled when the surface is collected for the second time before the initial setting of the concrete. The surface of the cast-in-situ slab is folded twice, the slab surface is leveled by the first time of aligning elevation, and the second time of surface folding is to ensure the slab surface to be leveled and prevent shrinkage cracks from being generated after surface moisture evaporation. The secondary surface is reversely carried out from the innermost side of the storey to the direction of the stairwell or the safety passage, and the concrete time is a few minutes before the initial setting of the concrete. The initial setting time of the concrete is related to the variety and quantity of the cement, the setting condition and the variety and quantity of the admixture, and the method is determined by experiments, and can be used for carrying out secondary surface collection when the fingerprint can be just left by pressing the surface of the concrete with fingers without sticking hands, and the tight assembly is dismounted and taken out at the time of surface collection. When the tightening assembly is disassembled, the hook bolt is unscrewed, the hook bolt moves upwards through the vertical slot of the steel pipe and is separated from the steel bar at the top of the plate, the short steel bar is inserted into the steel bar circular ring at the top of the steel pipe, the lower steel bar fixing piece is separated from the steel bar at the bottom of the plate by rotating by 90 degrees, and the assembly is vertically taken out to level the concrete surface at the extraction part.
(7) Cleaning for standby: the surface mortar needs to be cleaned immediately after the fastening component is disassembled, parts are damaged and replaced in time, and the surface mortar is placed in a drying place for storage so as to be used for turnover of the lower layer cast-in-situ plate, and the surface mortar can be circulated for many times.
In summary, the invention replaces the traditional protective layer cushion blocks and the reinforcing steel bar split heads by the turnover general reinforcing steel bar protective layer fastening components, not only can accurately control the deformation of the stressed ribs on the upper layer and the lower layer of the cast-in-situ slab and ensure that the thickness of the reinforcing steel bar protective layer of the cast-in-situ slab meets the standard, but also can be circulated, meet the use of different plate thicknesses, has strong universality, can save a large number of reinforcing steel bars, can reduce the manufacturing cost by nearly 2 yuan per square meter, reduces the manufacturing cost, simultaneously achieves energy conservation and environmental protection, completely accords with the green building concept, has no influence on the structure itself, and can not produce adverse effects on the structural safety.
The invention has the advantages of simple manufacture, available local materials, simple and convenient field installation, reliable support, quick disassembly, firmness and durability, simplified construction procedures, improved working efficiency, accurate thickness of the reinforcing steel bar protection layer to millimeter by adjusting the elevation of the fastening bolt, ensured construction precision, promotion of integral improvement of the quality of the cast-in-situ reinforced concrete structural engineering and good popularization value.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. The turnover fine control fastening assembly is characterized by comprising a welded steel pipe (2), wherein the top of the welded steel pipe (2) is connected with a steel bar circular ring (1), a vertical groove (3) is formed in the welded steel pipe (2), an M8 hook bolt (4) is connected in the vertical groove (3), an M8 nut (5) is connected on the M8 hook bolt (4), and the bottom of the welded steel pipe (2) is connected with a steel firmware (8); the steel firmware (8) is L-shaped; the included angle between the M8 hook bolt (4) and the horizontal plane is 45 degrees, and the included angle between the upper notch connecting line of the vertical grooves (3) on two sides of the welded steel pipe (2) and the horizontal plane and the included angle between the lower notch connecting line and the horizontal plane are both 45 degrees; the steel fixing piece (8) is used as a fixing piece of the lower plate layer steel bar (10), and the M8 hook bolt (4) penetrating through the welded steel pipe (2) is used as a fixing piece of the upper plate layer steel bar (9); unscrewing the M8 hook bolt (4), lifting through the vertical groove (3), separating from the lower plate upper layer rib iron (9), inserting the steel bar circular ring (1) by using a short steel bar, rotating by 90 degrees to separate the steel fixing piece (8) from the lower plate upper layer rib iron (9), and vertically taking out the assembly.
2. The turnover fine control tightening assembly according to claim 1, characterized in that a wedge-shaped cushion block (6) and a steel cushion block (7) are arranged between the welded steel pipe (2) and the M8 nut (5).
3. An epicyclic fine control fastening assembly according to claim 1, wherein the groove width of said vertical groove (3) is 10mm.
4. The turnover fine control fastening assembly as claimed in claim 1, wherein the steel bar ring (1) is adhered with a reflective film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810720392.7A CN108868011B (en) | 2018-07-02 | 2018-07-02 | Turnover fine control fastening assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810720392.7A CN108868011B (en) | 2018-07-02 | 2018-07-02 | Turnover fine control fastening assembly |
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| CN108868011A CN108868011A (en) | 2018-11-23 |
| CN108868011B true CN108868011B (en) | 2024-02-02 |
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| CN203531250U (en) * | 2013-09-30 | 2014-04-09 | 淄博市建筑工程质量安全监督站 | Reusable steel bar split heads |
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| CN206888536U (en) * | 2017-06-16 | 2018-01-16 | 发达控股集团有限公司 | One kind can have enough to meet the need split heads |
| CN207194317U (en) * | 2017-09-05 | 2018-04-06 | 中国建筑一局(集团)有限公司 | A kind of type quick detaching split heads |
| CN208455954U (en) * | 2018-07-02 | 2019-02-01 | 中铁十六局集团城市建设发展有限公司 | A kind of turnover essence control tightening component |
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| US20070157542A1 (en) * | 2005-12-19 | 2007-07-12 | Peterson David J Jr | Rebar chair with depth gauge |
| US7870702B2 (en) * | 2007-01-29 | 2011-01-18 | Mckay Gary Dan | Concrete reinforcement support chair |
| AU2014224166B2 (en) * | 2013-09-15 | 2018-10-11 | Bfre Pty Ltd As Trustee | Dual Mesh Level Reinforcement Bar Chair Assembly |
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| CN202731103U (en) * | 2012-01-30 | 2013-02-13 | 李福友 | Height-adjustable rebar split head capable of turning around |
| CN202440997U (en) * | 2012-02-22 | 2012-09-19 | 中国新兴保信建设总公司 | Reusable reinforcement pre-support device of concrete floor slab |
| CN103422622A (en) * | 2013-09-07 | 2013-12-04 | 唐山曹妃甸二十二冶工程技术有限公司 | Height-adjustable recyclable reinforcing steel bar split heads |
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| CN107100308A (en) * | 2017-05-27 | 2017-08-29 | 中国建筑局（集团）有限公司 | A kind of concrete floor slab construction method with reusable stirrup muscle |
| CN206888536U (en) * | 2017-06-16 | 2018-01-16 | 发达控股集团有限公司 | One kind can have enough to meet the need split heads |
| CN207194317U (en) * | 2017-09-05 | 2018-04-06 | 中国建筑一局(集团)有限公司 | A kind of type quick detaching split heads |
| CN208455954U (en) * | 2018-07-02 | 2019-02-01 | 中铁十六局集团城市建设发展有限公司 | A kind of turnover essence control tightening component |
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| CN108868011A (en) | 2018-11-23 |
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