CN111827669B - Steel beam floor formwork system and construction method thereof - Google Patents
Steel beam floor formwork system and construction method thereof Download PDFInfo
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- CN111827669B CN111827669B CN202010725963.3A CN202010725963A CN111827669B CN 111827669 B CN111827669 B CN 111827669B CN 202010725963 A CN202010725963 A CN 202010725963A CN 111827669 B CN111827669 B CN 111827669B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 238000009415 formwork Methods 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 title claims abstract description 12
- 238000004220 aggregation Methods 0.000 claims abstract description 9
- 230000002776 aggregation Effects 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 102000004315 Forkhead Transcription Factors Human genes 0.000 claims description 6
- 108090000852 Forkhead Transcription Factors Proteins 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 210000001015 abdomen Anatomy 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
- E04G11/50—Girders, beams, or the like as supporting members for forms
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Abstract
A steel beam floor formwork system and a construction method thereof comprise a placing device placed on a steel beam, a truss, a bottom plate beam and a bottom formwork; the steel beam is an I-shaped steel beam; the truss is a three-beam type strong truss and comprises three frame beams, a plurality of isosceles triangular frames and a plurality of isosceles right-angle triangular frames, the three frame beams are respectively welded on three vertexes of the isosceles triangular frames, the isosceles right-angle triangular frames are respectively welded on two side frames, and the right vertexes of the isosceles right-angle triangular frames on the two sides are superposed with the upper vertexes of the isosceles triangles to form a strong aggregation point; the laying device comprises a bottom fastener and an adjusting plate; the right-angle vertex of the isosceles right-angle tripod can also be made into a fork-shaped vertex; the three-beam type strong truss has the beneficial effects that the three-beam type strong truss is adopted, the isosceles triangular frame and the right-angle peak of the isosceles right-angle triangular frame are made into a fork-shaped peak, the structural strength is high on the whole, the looseness cannot occur, the safety is high, the mounting and the dismounting are convenient, and the three-beam type strong truss is suitable for being popularized in a large scale.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a steel beam floor formwork erecting system and a construction method thereof.
Background
With the rapid development of the construction industry, steel structures are widely applied to building construction.
In the construction process of the steel structure building concrete cast-in-place floor plate, formwork erecting operation is a very important link. Traditional floor board formwork usually adopts full hall scaffold, and the scaffold generally adopts steel pipe scaffold or wrist to detain formula scaffold, all needs to move about freely and quickly the horizon bar and connect to guarantee stably, nevertheless there is the steel pipe in kind of mode and installs and remove loaded down with trivial details, with high costs, inefficiency scheduling problem, especially in choosing the higher floor board of height, these problems are more outstanding.
Therefore, patent document CN 102418416B discloses a formwork system for a large-span steel beam cast-in-place floor slab, which includes a floor slab formwork, an adjustable truss and an adjustable laying support for supporting the adjustable truss, wherein a grid is laid on the adjustable truss, the floor slab formwork is laid on the grid, the adjustable laying support is arranged on a lower flange of an i-shaped steel beam, the adjustable truss is a telescopic combined truss, and the adjustable truss is connected with the upper end of the adjustable laying support; the truss has the advantages of adjustable span, adjustable height, applicability to different beam heights, greatly improved applicability, and greatly reduced formwork supporting cost.
Although the applicability of the truss is greatly improved, the method has potential safety hazards in two aspects, namely, a formwork supporting system needs to bear strong pressure of a reverse mould, when the adjustable truss is adopted, the strength of the truss is greatly reduced, and the truss is easily deformed by impact force during the reverse mould; and secondly, the adjustable placing support is adjusted by adopting a bolt, and when the pressure is overlarge, the bolt is easy to loosen.
Disclosure of Invention
The invention aims to solve the technical problem of providing a formwork system suitable for mounting a lower flange of a steel beam, which has high truss structural strength, can not loosen a laying support, is convenient to mount and dismount and has higher safety.
In order to solve the technical problems, the technical scheme adopted by the invention is a steel beam floor formwork system which comprises a placing device placed on a plurality of steel beams, a truss, a bottom plate beam and a bottom formwork.
The steel beam is an I-shaped steel beam and comprises an upper wing, a web plate and a lower wing, the web plate is generated on the central line of the upper wing and the central line of the lower wing, the upper wing is fixedly connected with the lower wing, the upper wing comprises upper flanges generated on the left side and the right side of the upper wing, and the lower wing comprises lower flanges generated on the left side and the right side of the lower wing.
The truss is a three-beam type strong truss, each truss comprises three beams, a plurality of isosceles triangular frames and a plurality of isosceles right-angle triangular frames, wherein the length of the hypotenuse of each isosceles right-angle triangular frame is twice as long as the length of the waist edge of each isosceles right-angle triangular frame; the plurality of isosceles triangular frames are arranged at equal intervals by taking the side length of the waist edge as a spacing distance, and three frame beams are respectively welded on three vertexes of the isosceles triangular frames arranged at equal intervals to form a ladder beam type three-frame beam comprising a bottom surface frame and two side surface frames, wherein two of the three frame beams are bottom frame beams, and one of the three frame beams is a top frame beam; then welding a plurality of isosceles right-angle tripods on the two side frames respectively, overlapping the bevel edge of the isosceles right-angle triangle with the bottom frame beam during welding, overlapping the right-angle vertexes of the isosceles right-angle tripods on the two sides with the upper vertex of the isosceles right-angle triangle, and combining the three vertexes with the top frame beam to form a strong aggregation point; the isosceles right-angle tripods are mutually connected in a staggered way, namely the vertex of the hypotenuse of one isosceles right-angle tripod is arranged on the middle point of the hypotenuse of the other isosceles right-angle tripod; to form a three-beam type strong truss.
The shelving device comprises a bottom fastener and an adjusting plate, the adjusting plate is a distributed type superposed assembly plate and is composed of a plurality of steel plates with different thicknesses, the width of each steel plate is smaller than that of the lower flange of the steel beam, and one or more steel plates can be plugged in to adjust the height of the shelving truss during use.
The length of the steel plate is greater than the length of the bottom edge of the isosceles tripod, and preferably less than 1.5 times of the length of the bottom edge; the width of the steel plate is smaller than that of the lower flange, and is preferably larger than half of the width of the lower flange.
The bottom fastener is a U-shaped fastener and comprises an upper plate, a lower plate and a side plate, wherein the lower plate is vertically fixed and generated or welded on the edge of the bottom end of the side plate, and the upper plate is vertically fixed and generated or welded on the middle or middle upper part of the side plate, is parallel to the lower plate and is positioned on the same side of the side plate; the lower plate is also provided with screw holes and bolts; therefore, the U-shaped fastener can be clamped on the lower flange and fastened by the bolt, and the side plate extending out of the upper plate can block the steel plate when the steel plate is cushioned, so that the steel plate cannot fall off before being installed and not compressed.
The bottom plate beam is a square long rod and can be a square wood rod, a square iron rod or a square aluminum alloy rod.
The bottom template is a conventional template.
Furthermore, the isosceles triangular frame is a fork-type triangular frame, namely three sides of the triangular frame extend outwards after being intersected pairwise, two end sides extending out of the top point form a fork head, when the triangular frame is welded into a truss, two bottom frame beams and one top frame beam are placed in the fork head and then welded, so that the bottom edges of the isosceles triangular frame can be completely placed on the two bottom frame beams, the top frame beam is completely placed above the upper top point fork head formed by the two waist sides, the supporting force faces upwards, and the formed force is far greater than that in the isosceles triangular frame formed by welding the bottom frame beams and the bottom frame beams.
Furthermore, the right-angle vertex of the isosceles right-angle tripod is a fork-shaped vertex, and the other two vertexes are unchanged; namely, the two right-angle sides are intersected and then extend outwards, and two end sides extending out of the top point form a fork head; when the truss is welded, the two isosceles right-angle tripods are respectively welded on the two side frames from two sides, the hypotenuse of the isosceles right-angle triangle is superposed with the underframe beam, after the right-angle peak is superposed with the upper peak of the isosceles right-angle tripod, two fork rods on the upper peak of the isosceles right-angle tripod are respectively placed in the forks on the two right-angle peaks, and then welding is carried out, so that the upper peak fork of the isosceles right-angle tripod can bear larger pressure.
Further, the isosceles triangular frame is a positive triangular frame with three equal sides.
In addition, the width of the fastener is equal to the width of the lower flange, and the length of the fastener is equal to 1.3 times of the length of the bottom edge of the isosceles tripod, so that the adjusting plate and the truss can be conveniently placed.
In addition, the lower plate of the fastener is provided with at least two screw holes, and each screw hole is provided with a matched bolt.
In addition, the length of the adjusting plate is greater than that of the fastener, and a through hole is also dug in the plate surface of the adjusting plate, which is longer than the fastener, on the edge end of the adjusting plate; this facilitates the removal of the adjusting plate first during the removal of the mould.
A construction method of a steel beam floor formwork system comprises the following steps.
The die filling step is as follows.
S1, buckling a U-shaped fastener on a lower flange of a steel beam in a wrapping mode, and screwing a bolt on a lower plate of the fastener to fix the U-shaped fastener on the lower flange; u-shaped fasteners are arranged at corresponding design positions on the steel beams on two sides of the floor.
S2, placing the truss on the upper plate of the fastener in a vertical shape, and enabling the edge end of the truss to contact the web of the steel beam as much as possible; the truss is now perpendicular to the steel beam.
And S3, adjusting the height of the truss after reserving the thickness of the bottom plate beam according to the height to be paved of the bottom template, placing an adjusting plate between the truss and the upper plate, and placing the adjusting plate in a side plate of an outlet head on the U-shaped fastener.
And S4, paving a plurality of bottom plate beams on the truss, wherein the bottom plate beams are parallel to the steel beams.
And S5, paving a bottom template on the bottom plate beam.
And after the die reversing maintenance is finished, the die unloading step is as follows.
S6, firstly hooking the through hole on the thinnest adjusting plate steel plate by using an iron hook, or hammering the iron hook by using an iron hammer to pull out the thinnest adjusting plate.
And S7, sequentially pulling out other adjusting plates, and sequentially taking out the lower bottom plate beam, the bottom template and the truss.
The invention has the advantages that the formwork can be supported without a scaffold on the whole, the structure of the steel beam is used as an acting point of the formwork, wherein the truss adopts a three-frame beam type strong truss, and the upper peak of one isosceles tripod, the right-angle peaks of two isosceles right-angle tripods and the top frame beam jointly form a strong aggregation point, so that strong supporting force can be provided for the bottom plate beam; the bottom fastener and the adjusting plate are combined to form the laying device, so that the supporting system is firm and practical; the isosceles triangular frame and the right-angle peak of the isosceles right-angle triangular frame are further made into fork-shaped peaks, so that the supporting force for the bottom plate beam can be further strengthened, and the bottom plate beam is firmer; structural strength is high on the whole, and is unable not hard up, and the security is high, and the installation and the dismantlement of being convenient for are fit for promoting in a large number.
Drawings
Fig. 1 is a schematic view of the overall structure of the steel beam floor formwork system of the present invention.
FIG. 2 is a schematic view of the structure of the steel beam of the present invention.
FIG. 3 is a schematic view of the structure of the shelving unit of the invention.
Fig. 4 is a schematic structural view of each component of the truss in the invention, including a front view of the isosceles triangular frame and an oblique view thereof, and a front view of the isosceles right-angle triangular frame and an oblique view thereof in two directions.
Fig. 5 is a schematic structural diagram in the manufacturing process of the truss in the invention.
Fig. 6 is a schematic structural view of a prong-shaped vertex of the isosceles tripod and the isosceles right-angle tripod in embodiment 3, and a schematic structural view of the isosceles tripod with the prong-shaped vertex and the isosceles right-angle tripod in the manufacturing process of welding the isosceles right-angle tripod to the truss.
In the figure: 1. the steel beam, 2, the rest device, 3, the truss, 4, the bottom plate beam, 5, the bottom template, 10, the upper wing, 11, the web plate, 12, the lower wing, 13, the lower flange, 14, the waist height, 15, the wing width, 16, the web thickness, 17, the wing thickness, 18, the lower wing width, 19, the web height, 20, the bottom fastener, 21, the adjusting plate, 22, the steel plate, 23, the through hole, 24, the upper plate, 25, the lower plate, 26, the side plate, 27, the screw hole, 28, the bolt, 30, the girder, 31, the isosceles triangle, 32, the isosceles triangle, 33, the bevel edge of the isosceles triangle, 34, the waist edge of the isosceles triangle, 35, the bottom frame, 36, the side frame, 37, the bottom frame beam, 38, the top frame beam, 39, the strong aggregation point, and 6, the forked head-shaped vertex.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to illustrate the invention but not to limit it further, and should not be construed as limiting the scope of the invention.
Example 1.
As shown in fig. 1 to 5, a girder floor formwork system is provided, which includes a shelving unit 2, a girder 3, a floor beam 4 and a bottom form 5, which are rested on a plurality of girders 1.
The steel beam 1 is an I-shaped steel beam, for example, a 36# B-shaped steel beam, the steel beam 1 comprises an upper wing 10, a web 11 and a lower wing 12, the web 11 is cast on the central line of the upper wing 10 and the lower wing 12, the upper wing 10 and the lower wing 12 are fixedly connected, the upper wing 10 comprises upper flanges generated on the left side and the right side of the upper wing, and the lower wing 12 comprises lower flanges 13 generated on the left side and the right side of the lower wing; wherein the waist height 14 is 360mm, the wing width 15 is 138mm, the abdomen thickness 16 is 12mm, the wing thickness 17 is 12mm, the lower wing width 18 is 63mm, and the abdomen height 19 is 336 mm; the distance between the two steel beams is 5 meters.
The truss 3 is equipped according to the type and the interval of the steel beam 1, the truss 3 is a three-frame beam type strong truss, each truss 3 comprises three frame beams 30, a plurality of isosceles tripods 31 and a plurality of isosceles right-angle tripods 32, wherein the side length of an inclined edge 33 of each isosceles right-angle tripod is twice as long as that of a waist edge 34 of each isosceles tripod; the isosceles triangular frames 31 are arranged equidistantly with the side length of the waist side as the interval distance, and three frame beams 30 are respectively welded on three vertexes of the isosceles triangular frames 31 arranged equidistantly to form a ladder beam type three-frame beam comprising a bottom surface frame 35 and two side surface frames 36, wherein two of the three frame beams are bottom frame beams 37, and one of the three frame beams is a top frame beam 38; then a plurality of isosceles right-angle tripods 32 are respectively welded on two side frames 36, the bevel edge 33 of each isosceles right-angle tripod is coincided with the bottom frame beam 37 during welding, the right-angle vertexes of the isosceles right-angle tripods 33 on the two sides are coincided with the upper vertexes of the isosceles triangles 31, the three vertexes are combined with the top frame beam 38 to form a strong force aggregation point 39, and the isosceles right-angle tripods 32 are mutually connected in a staggered mode, namely the vertex of the bevel edge of one isosceles right-angle tripod is arranged on the middle point of the bevel edge of the other isosceles right-angle tripod; forming a three-beam type strong truss; in the embodiment, the frame beam 30 is made of a steel pipe with the outer diameter of 30mm and the length of 4.99 meters, the steel bar with the diameter of 10mm is used for making the isosceles triangular frame 31 and the isosceles right-angle triangular frame 32, the isosceles triangular frame 31 is made into an equilateral triangular frame, the length of each steel bar is 231mm, and the height of the isosceles triangular frame 31 made in this way is 200 mm; the length of the bevel edge of the isosceles right triangular frame 32 is 462mm, the length of the right-angle edge is 327mm, and the height of the isosceles right triangular frame 32 is 231 mm; thus, a plurality of isosceles tripods 31 and isosceles right-angle tripods 32 are manufactured; then, the isosceles triangular frames 31 are equidistantly arranged at intervals of 231mm, 21 steel pipes are arranged in total, then three steel pipes serving as frame beams 30 are respectively welded on three vertexes of the isosceles triangular frames 31, and the steel pipes at two ends extend outwards for about 35-38mm after welding, so that the triangular pyramid-shaped ladder beam type three frame beams comprising the bottom surface frame 35 and the two side surface frames 36 are manufactured, wherein two frame beams 30 are bottom frame beams 37, and one frame beam 30 is a top frame beam 38; then welding the isosceles right triangle 32 on the two side frames 36 from two sides, overlapping the bevel edge 33 of the isosceles right triangle with the bottom frame beam 37 during welding, overlapping the right angle vertex with the upper vertex of the isosceles right triangle 31, so that three vertexes are gathered together and combined with the top frame beam 38 to form a strong aggregation point 39, and the bottom plate beam 4 above the top frame beam 38 can be supported strongly; at this time, the isosceles right triangular brackets 32 on the two side frames 36 are alternately attached to each other, that is, the edge vertex of the hypotenuse of one isosceles right triangular bracket is installed at the midpoint of the hypotenuse of the other isosceles right triangular bracket; together forming a three-beam type strong truss.
A laying device 2 is prepared according to the specification of the truss 3, the laying device 2 comprises a bottom fastener 20 and an adjusting plate 21, and the adjusting plate 21 is a distributed superposed assembly plate and is composed of a plurality of steel plates 22 with different thicknesses; the length of the steel plate 22 is greater than the length of the bottom edge of the isosceles triangular frame 31, and preferably less than 1.5 times of the length of the bottom edge; the width of the steel plate 22 is smaller than the width of the lower flange 13, and preferably greater than half of the width of the lower flange 13; in this embodiment, the width of the steel plate 22 is 50mm, and the length is 330 mm; the thicknesses are respectively 20mm, 10mm, 5mm, 2mm and 1mm, and the thicknesses can be additionally set according to requirements; then, a through hole 23 with the aperture of 10mm is dug at the position 15mm away from the edge end of the steel plate 22, so that the steel plate can be conveniently pulled out as an acting point during mold unloading.
The bottom fastener 20 is a U-shaped fastener, and comprises an upper plate 24, a lower plate 25 and a side plate 26, wherein the lower plate 25 is vertically fixed and generated or welded on the bottom end edge of the side plate 26, the upper plate 24 is vertically fixed and generated or welded on the middle or middle upper part of the side plate 26, and is parallel to the lower plate 25 and is on the same side of the side plate 26; the lower plate 25 is also provided with screw holes 27 and matched bolts 28; in the embodiment, the thickness of the upper plate 24, the lower plate 25 and the side plate 26 is made to be 10mm, the length is made to be 300mm, and the length is shorter than the length of the adjusting plate 21, so that the adjusting plate 21 can be conveniently taken out when the mold is unloaded; making the width of the upper plate 24 and the lower plate 25 to be 75mm, making the height of the side plate 26 to be 70mm, directly pouring cast steel through a die, directly forming the lower plate 25 on the bottom end edge of the side plate 26, and directly forming the upper plate 24 on the side wall 20mm away from the upper end edge of the side plate 26; then, two screw holes 27 are dug on the lower plate 25, or three or four screw holes are dug, wherein the inner diameter of each screw hole 27 is made to be 25mm, and each screw hole is provided with a matched bolt 28.
Then, a bottom plate beam 4 is arranged, the bottom plate beam 4 is made into a square long rod which is made of square wood rods, the length of the square wood rods is 1.6 meters, and the side length of the square wood rods is 40 mm.
A conventional template is used as the bottom template 5.
Example 2.
A construction method of a steel beam floor formwork system comprises the following steps of construction during formwork installation.
S1, buckling a bottom buckle 20, namely a U-shaped buckle on a lower flange 13 of a steel beam 1, and tightening bolts 28 on a buckle lower plate 25 to fix the U-shaped buckle on the lower flange 13; treat in this embodiment and water floor slab both sides girder steel 1 at a distance of 5 meters, all install U type fastener in the position that corresponds on two girder steels 1, every interval 1.2 meters installation one.
S2, the truss 3 is vertically placed on the upper plate 24 of the fastener, and as the length of the frame beam 30 on the truss 3 is 4.99 meters and is close to the distance between the steel beams, the edge end of the truss 2 can contact the web plate 11 of the steel beam 1 as much as possible; and the girder 3 is made perpendicular to the steel girder 1.
S3, adjusting the height of the truss 3 after reserving the thickness of the bottom plate beam 4 according to the height to be paved of the bottom template 5, placing an adjusting plate 21 between the truss 3 and an upper plate 24 of the fastener, placing an appropriate number of adjusting plate steel plates 22 or adjusting plate steel plates 22 with different thicknesses according to actual needs, and placing the adjusting plate 21 in a side plate 26 of an outgoing head on the U-shaped fastener; therefore, the steel plate 22 can be prevented from being displaced due to vibration in the installation or die-reversing process, and safety accidents are avoided.
S4, paving a plurality of bottom plate beams 4 on the truss 3, directly placing the bottom plate beams 4 on the strong aggregation points 39 on the truss 3, placing the bottom plate beams 4 on each strong aggregation point 39, and placing the bottom plate beams 4 in parallel with the steel beam 1. This allows the strong convergence point 39 to support the floor beams 4 directly.
And S5, paving a bottom template 5 on the bottom plate beam 4.
After the formwork system is installed, because adjustable parts are not arranged, each layer of structure is firm, the formwork system cannot be loosened no matter how the formwork system vibrates during formwork reversing, the formwork reversing effect is good, and the safety coefficient is high. And after the reverse mould maintenance is finished, when the mould is disassembled, construction is carried out according to the following steps.
S6, firstly hooking the through hole 23 on the steel plate 22 of the thinnest adjusting plate 21 by using an iron hook, or outwards hammering the iron hook by using an iron hammer to pull out the thinnest steel plate 22.
And S7, pulling out other adjusting plates 21 in sequence, and taking the lower bottom plate beam 4, the bottom template 5 and the truss 3 in sequence.
Example 3.
Further, as shown in fig. 6, on the basis of embodiment 1, three vertexes of the isosceles triangular frame 31 are all made into a fork-shaped vertex 6, that is, three sides of the triangular frame are intersected two by two and then all extend outward, two end sides extending outside the vertex form a fork, when welding, two base frames 37 and one top frame 38 are both placed in the fork on the fork-shaped vertex 6, and then welding is performed, so that the bottom side of the isosceles triangular frame 31 can be completely placed on the two base frames 37, and the top frame 38 can be completely placed above the fork of the upper vertex formed by the two waist sides, so that the supporting force is upward, and the formed force is much greater than that in the isosceles triangular frame 31 formed by welding the base frames 37 and the top frame 38.
Further, on the basis of embodiment 1, the right-angle vertex of the isosceles right-angle tripod 32 is made into a fork-shaped vertex 6, and the other two vertexes are not changed and are not made into a fork shape; during welding, the two isosceles right-angle tripods 32 are respectively welded on the two side frames 36 from two sides, the hypotenuse 33 of the isosceles right triangle is superposed with the underframe beam 37, after the right-angle vertex is superposed with the upper vertex of the isosceles tripod 31, the two fork rods on the upper vertex of the isosceles tripod 31 are respectively placed in the forks on the two right-angle vertices, and then welding is carried out, so that the forks on the upper vertex of the isosceles tripod can bear larger pressure.
Thus, three forked vertices 6 are grouped together to form a strong convergence point 39 in conjunction with the roof rail 38, which will be able to strongly support the floor rail 4 above its roof rail 38 with greater strength.
In this embodiment, the lengths of the steel bars on the three sides of the isosceles tripod 31 are all made into 291mm, and then every two steel bars are welded to each other at a position 30mm away from the end point to form a regular tripod with three vertexes all being the forked vertex 6. The forked rod extending out of the forked regular tripod is 30mm, and the side length of the triangle is still 231 mm. And then the right angle vertex of the isosceles right triangular frame 32 is made into a fork-shaped vertex 6, the other two vertexes are unchanged, the length of a steel bar of a right angle side is made into 357cm, and a fork rod which extends out of 30mm is made into the right angle vertex of the isosceles right triangular frame 32.
Claims (5)
1. A construction method of a steel beam floor formwork system comprises a laying device laid on a steel beam, a truss, a bottom plate beam and a bottom formwork, and is characterized in that:
the steel beam is an I-shaped steel beam and comprises an upper wing, a web plate and a lower wing, and the lower wing comprises lower flanges generated on the left side and the right side;
the truss is a three-beam type strong truss, each truss comprises three beams, a plurality of isosceles triangular frames and a plurality of isosceles right-angle triangular frames, wherein the length of the hypotenuse of each isosceles right-angle triangular frame is twice as long as the length of the waist edge of each isosceles right-angle triangular frame; the plurality of isosceles triangular frames are arranged at equal intervals by taking the side length of the waist edge as a spacing distance, and three frame beams are respectively welded on three vertexes of the isosceles triangular frames arranged at equal intervals to form a ladder beam type three-frame beam comprising a bottom surface frame and two side surface frames, wherein two of the three frame beams are bottom frame beams, and one of the three frame beams is a top frame beam; then welding a plurality of isosceles right-angle tripods on the two side frames respectively, overlapping the bevel edge of the isosceles right-angle triangle with the bottom frame beam during welding, overlapping the right-angle vertexes of the isosceles right-angle tripods on the two sides with the upper vertex of the isosceles right-angle triangle, and combining the three vertexes with the top frame beam to form a strong aggregation point; the isosceles right-angle tripods are mutually connected in a staggered way, namely the vertex of the hypotenuse of one isosceles right-angle tripod is arranged on the middle point of the hypotenuse of the other isosceles right-angle tripod; forming a three-beam type strong truss;
The laying device comprises a bottom fastener and an adjusting plate, the adjusting plate is a distributed type superposed assembly plate and is composed of a plurality of steel plates with different thicknesses, and the length of each steel plate is greater than the length of the bottom edge of the isosceles tripod and is less than 1.5 times of the length of the bottom edge; the width of the steel plate is smaller than that of the lower flange and is larger than half of the width of the lower flange;
the bottom fastener is a U-shaped fastener and comprises an upper plate, a lower plate and a side plate, wherein the lower plate is vertically fixed on the edge of the bottom end of the side plate, and the upper plate is vertically fixed in the middle or middle upper part of the side plate, is parallel to the lower plate and is positioned on the same side of the side plate; the lower plate is also provided with screw holes and bolts;
the bottom plate beam is a square long rod;
the bottom template is a conventional template;
the isosceles tripod is a fork-type tripod, namely three sides of the tripod extend outwards after being intersected pairwise, and two end edges extending out of a vertex form a fork; when the truss is welded, two bottom frame beams and one top frame beam are placed in the fork head and then welded;
the right-angle vertex of the isosceles right-angle tripod is a fork-shaped vertex, and the other two vertexes are unchanged; namely, the two right-angle sides are intersected and then extend outwards, and two end sides extending out of the top point form a fork head; when the truss is welded, two isosceles right-angle tripods are respectively welded on two side frames from two sides, the bevel edge of the isosceles right-angle triangle is superposed with the underframe beam, and after the right-angle vertex is superposed with the upper vertex of the isosceles right-angle tripod, two fork rods on the upper vertex of the isosceles right-angle tripod are respectively placed in the forks on the two right-angle vertices and then are welded;
A through hole is also dug in the edge end of the adjusting plate;
the construction method comprises the following steps of:
s1, buckling a U-shaped fastener on a lower flange of a steel beam in a wrapping mode, and screwing a bolt on a lower plate of the fastener to fix the U-shaped fastener on the lower flange; u-shaped fasteners are arranged at corresponding design positions on the steel beams on the two sides of the floor slab;
s2, vertically placing the truss on the upper plate of the fastener, and enabling the edge end of the truss to contact with a web plate of the steel beam; the truss is vertical to the steel beam;
s3, adjusting the height of the truss after reserving the thickness of the bottom plate beam according to the height to be paved of the bottom template, placing an adjusting plate between the truss and the upper plate, and placing the adjusting plate in a side plate of an upper head of the U-shaped fastener;
s4, paving a plurality of bottom plate beams on the truss, wherein the bottom plate beams are parallel to the steel beams;
s5, paving a bottom template on the bottom plate beam;
when the die is unloaded:
s6, hooking the through hole in the thinnest adjusting plate steel plate by using an iron hook, and hammering the iron hook by using an iron hammer to pull out the thinnest adjusting plate;
and S7, sequentially pulling out other adjusting plates, and sequentially taking out the lower bottom plate beam, the bottom template and the truss.
2. The method of constructing a steel beam floor formwork system of claim 1, wherein said isosceles tripod is a trilateral equal tripod.
3. The method of constructing a steel beam floor formwork system as claimed in claim 2, wherein said fastener has a width equal to the width of the lower flange and a length equal to 1.3 times the length of the base of an isosceles tripod.
4. The method of constructing a steel beam floor formwork system according to claim 3, wherein the length of the adjusting plate is greater than the length of the fastener.
5. The method of constructing a steel beam floor formwork system of claim 4, wherein at least two screw holes are provided on the lower plate of the fastener, and each screw hole is provided with a matching bolt.
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| CN202010725963.3A CN111827669B (en) | 2020-07-25 | 2020-07-25 | Steel beam floor formwork system and construction method thereof |
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| CN102444281A (en) * | 2011-09-09 | 2012-05-09 | 潘克远 | U-shaped force-bearing seat and construction method of steel beam-reinforced concrete floor slab structure |
| CN204298836U (en) * | 2014-12-04 | 2015-04-29 | 中铁四局集团第三建设有限公司 | A kind of pile film cofferdam skeleton structure |
| KR101913929B1 (en) * | 2017-02-21 | 2018-10-31 | 한국기술교육대학교 산학협력단 | Joint portion for connecting deck plates |
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