CN212452289U - Slow-bonding shear nail and steel-concrete composite beam - Google Patents
Slow-bonding shear nail and steel-concrete composite beam Download PDFInfo
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- CN212452289U CN212452289U CN202020721992.8U CN202020721992U CN212452289U CN 212452289 U CN212452289 U CN 212452289U CN 202020721992 U CN202020721992 U CN 202020721992U CN 212452289 U CN212452289 U CN 212452289U
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Abstract
The utility model provides a slow bonding shear force nail, including sleeve and double-screw bolt welding nail, the sleeve includes barrel and upper cover, and barrel and upper cover enclose the synthesis and accept the chamber, and it has the slow viscose adhesion agent to accept the intracavity packing, and the double-screw bolt welding nail includes and is delayed the cladding portion of viscose adhesion agent cladding, cladding portion shutoff barrel with steel construction welded weld part and in stretching into the barrel. The utility model also provides a steel concrete composite beam, including steel construction, concrete slab, a plurality of prestressing steel strand wires and foretell a plurality of slow bonding shear force nails, each prestressing steel strand wires stretch-draw in concrete slab, the steel construction supports concrete slab, each slow bonding shear force nail welds and just all pours in concrete slab on the steel construction. The utility model provides a slowly bond shear force nail had both guaranteed the real atress that makes up of steel sheet and concrete, had solved the problem that the hogging moment concrete prestressing force introduction degree reduces of steel-concrete composite beam again.
Description
Technical Field
The utility model relates to a steel concrete composite beam field especially relates to a slow bonding shear force nail and steel-concrete composite beam.
Background
The shear connector is a key element for ensuring the joint work of steel and concrete in the steel-concrete composite beam. Shear nails are common shear connectors used today, and their main function is to resist shearing (shearing force) and pulling (lifting) between a steel beam and a concrete beam. And the concrete part in the hogging moment area can generate tensile stress, so that the concrete slab cracks, and the service durability of the bridge is influenced. Usually, the crack is controlled by applying prestress and other measures in the hogging moment area, but the steel beam absorbs partial prestress through the combination action, so that the introduction degree of the prestress is reduced. Therefore, how to increase the prestress introduction degree of the hogging moment area of the composite beam so as to control the tensile stress of concrete within an allowable range becomes a key of the design of the steel-concrete composite beam bridge.
The problem of prestress application efficiency is solved by adopting two technologies of combining a prestressed concrete bridge deck and a pulling-resistant non-shearing-resistant connecting piece at present.
The post-combined prestressed concrete bridge deck is prefabricated by adopting a pre-tensioning method or a post-tensioning method, and the prestressed concrete bridge deck is combined with the steel beam after the prestress is tensioned. The steel beam upper flange stud connecting piece adopts a novel cluster type arrangement mode (the conventional mode is a uniform distribution type arrangement), the prefabricated bridge deck is hollowed at the position (a nail group) of a steel beam shear nail to form a reserved groove or a post-pouring joint, and after the prefabricated slab is installed, high-strength mortar is poured into the reserved hole or the post-pouring joint to combine the steel beam and the concrete prefabricated slab. The method can effectively apply prestress to the hogging moment concrete slab, but the construction process is complex due to more joints, and the integrity of the bridge deck slab is not as good as the effect of one-time pouring.
The uplift-resistant non-shearing-resistant connecting piece is a special type of shear nail and consists of a screw rod and a screw cap which are welded on the flange of a steel beam and EVA foam which is sleeved outside the screw rod and the screw cap. The rigidity of the foamed plastic is negligible relative to steel and concrete, the foamed plastic allows the connecting piece to slide in the longitudinal direction, and the contact part of the screw cap (larger than the column head size of a common welding nail) and the concrete can restrict the concrete at the lower part and ensure certain uplift resistance, so that an uplift resistance and non-shear resistance working mechanism is formed in a certain sliding deformation range, the concrete is compressed when the prestress is tensioned, and the special shear nail ensures the introduction degree of the prestress. The concrete slab participates in the cast-in-place construction, the integrity is good, because of the barrier action of the foamed plastic, the concrete and the steel beam in the hogging moment area can not be combined to participate in the stress, compared with the conventional stud, the section rigidity of the hogging moment area is reduced to a certain extent, and the bending resistance bearing capacity is weakened.
Chinese patent application No. 201910483375.0 discloses a slow tack weld for use in a steel-concrete composite beam as a shear connector. The slow-bonding welding nail adopted by the patent is formed by wrapping a layer of slow bonding agent on the welding nail after the welding nail is welded, and then sleeving a sheath which is longitudinally divided into two halves on each welding nail. This slow bonding welding nail pattern of construction can't ensure because of the mobility of slow binder during site operation drips and the bottom seepage problem, and slow binder needs to coat on the welding nail at the job site, and this work progress is loaded down with trivial details, and the phenomenon that slow binder is not full appears easily, then can't finally ensure integrated configuration's atress performance when slow binder is not full. Under the impact force effect of concrete when concreting the construction, the dislocation can appear in the relative position of this kind of slow bonding welding nail outside sheath and welding nail, can lead to like this to slow bonding function inefficacy, and the engineering quality can't guarantee.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a structure type reasonable, atress performance is outstanding, adaptability is wide, convenient operation is nimble, economic nature is excellent slowly bonds the shear force nail, should slowly bond the shear force nail and both guaranteed steel sheet and the real combination atress of concrete, solved the problem that the hogging moment concrete prestressing force introduction degree of steel-concrete composite beam reduces again.
The utility model discloses a realize like this:
the utility model provides a slow bonding shear force nail, including sleeve and double-screw bolt welding nail, the sleeve includes barrel and upper cover, barrel and upper cover enclose the synthesis and accept the chamber, it has the slow-adhesion adhesive to accept the intracavity packing, the double-screw bolt welding nail includes with steel construction welded weld part and stretch into the barrel in by the cladding portion of slow-adhesion adhesive cladding, the cladding portion shutoff the barrel.
Preferably, the sleeve further comprises a nut, the nut is fixedly installed in the cylinder body, the stud welding nail comprises a screw head welded with the steel structure and a screw column extending into the cylinder body and used for plugging the cylinder body, the screw column is in threaded connection with the nut, and the slow-adhesion adhesive coats the screw column.
Preferably, the barrel is of a T-shaped structure, the barrel comprises a barrel head and a barrel rod, the barrel head is provided with an annular nut mounting plate, and the nut is located on the barrel head and fixedly supported on the nut mounting plate.
Preferably, the bore of the barrel shank tapers in a direction away from the barrel head.
Preferably, the outer wall of the rod part of the cylinder body is provided with concave and convex rib grains or corrugations.
Preferably, the cylinder, the upper cover and the nut fixing plate are all injection-molded parts of polyethylene, polypropylene or polyvinyl chloride.
Preferably, the upper cover is in threaded connection with the barrel, and the upper cover is positioned at the top of the barrel.
Preferably, the thickness of the end face, into which the stud welding nail extends, of the cylinder body is smaller than the wall thickness of the cylinder body, and the end face, into which the stud welding nail extends, of the cylinder body is recessed towards the inside of the cylinder body.
The utility model also provides a steel-concrete composite beam, including steel construction, concrete slab and a plurality of prestressing steel strand wires, each prestressing steel strand wires stretch-draw in concrete slab, steel construction support concrete slab, steel-concrete composite beam still includes foretell a plurality of slow bonding shear force nails, each slow bonding shear force nail welds on the steel construction and all pours in concrete slab.
The utility model discloses following beneficial effect has:
1. the utility model provides a slow viscose adhesive and telescopic material attribute, and the utility model discloses the steel sheet and the real atress that makes up of concrete has all effectively been guaranteed to the structural style of well slow bonding shear force nail, has solved the problem that the steel-concrete composite beam hogging moment concrete prestressing force introduction degree reduces simultaneously.
2. The utility model provides a slow bonding shear force nail does not need on-the-spot to give the welding nail coating and slowly glues the adhesive, has avoided the loaded down with trivial details process of site operation. The utility model provides a slow bonding shear force nail leakproofness is good, the problem that slow adhesive droops, drips can not appear, and slow adhesive fills enough full closely knit in the sleeve intussuseption, can guarantee effectively to apply prestressing force before the solidification of slow adhesive, can guarantee again that slow adhesive solidifies back steel-concrete integrated configuration's atress performance.
3. The slow-bonding shear nail adopts a structure that the stud welding nail and the nut are assembled through threaded connection (the structure of the common cylindrical head welding nail is not adopted), so that the manual operation steps of field construction are reduced, the slow-bonding shear nail is convenient and quick in engineering application, and large-scale use is possible. The retarded adhesive shear nail is novel in structural form, convenient and simple to construct and reliable in construction quality, the stud welding nail and the nut are connected through threads, and the condition that the retarded adhesive shear nail sleeve is staggered due to the impact force of concrete during concrete pouring can be effectively avoided.
4. The cavity in the cylinder body is provided with a taper, the plastic outside the cone is provided with a solid rib mark, and the taper, the rib mark and the nut provide anti-pulling force together after the slow-adhesion adhesive is cured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a cross-sectional view of a bond-retarded shear pin according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a sleeve according to an embodiment of the present invention;
fig. 3 is a schematic layout view of a bond-retarded shear pin according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-3, the embodiment of the utility model provides a slow bonding shear force nail is provided, including sleeve 1 and double-screw bolt welding nail 2, sleeve 1 includes barrel 3 and upper cover 4, upper cover 4 and barrel 3 threaded connection, upper cover 4 is located the top of barrel 3, barrel 3 and upper cover 4 enclose to synthesize and accept the chamber, it has slow viscose adhesion agent 5 to accept the intracavity packing, double-screw bolt welding nail 2 includes with 6 welded weld parts of steel construction and stretches into the cladding portion by slow viscose adhesion agent 5 cladding in the barrel 3, the shutoff of cladding portion barrel 3. The utility model provides a slow bonding shear force nail does not need on-the-spot to give the welding nail coating and slowly glues the adhesive, has avoided the loaded down with trivial details process of site operation. The utility model provides a slow bonding shear force nail leakproofness is good, the problem that slow adhesive droops, drips can not appear, and slow adhesive fills enough full closely knit in the sleeve intussuseption, can guarantee effectively to apply prestressing force before the solidification of slow adhesive, can guarantee again that slow adhesive solidifies back steel-concrete integrated configuration's atress performance. The sleeve still includes nut 7, and nut 7 is the steelwork, nut 7 fixed mounting is in barrel 3, stud welding nail 2 include with 6 welded screwhead of steel construction and stretch into the screw post of just shutoff barrel 3 in the barrel 3, the screw post with 7 threaded connection of nut, slow adhesive 5 cladding the screw post. Barrel 3 is T type structure, barrel 3 includes barrel head and barrel pole portion, the barrel head is equipped with annular nut mounting panel 8, nut 7 be located barrel head and fixed bearing in on the nut mounting panel 8. The slow-bonding shear nail adopts a structure that the stud welding nail 2 and the nut 7 are assembled through threaded connection (the structure of a common cylindrical head welding nail is not adopted), so that the manual operation steps of field construction are reduced, the slow-bonding shear nail is convenient and quick in engineering application, and large-scale use is possible. This slow bonding shear force nail construction type is novel, and construction convenience is simple and convenient, and construction quality is reliable, and stud welding nail 2 and nut 7 pass through threaded connection, and the impact force of the concrete when can effectively stop concreting leads to the condition that the shear force nail sleeve of slow setting knot produces the dislocation. The stud welding nail 2 is connected with the nut 7 through threads, and the nut 7 with the corresponding size can be designed according to different pulling resistance.
The slow-release adhesive 5 is a paste-like non-Newtonian fluid at the early stage, has better thixotropy and impact resistance, and ensures the application efficiency of the prestress in the hogging moment area during prestress tension; the slow-adhesion adhesive 5 has higher bonding strength and tensile and shearing strength after being cured, firmly bonds the nut 7, the stud welding nail 2 and the sleeve 1 into a whole, has good anti-pulling and anti-shearing capabilities, improves the integrity of the steel-concrete composite beam, and ensures that the combined structure is stressed reasonably; the slow-release adhesive 5 has higher strength and certain micro-expansibility after being cured, so that the slow-release adhesive has better construction performance and mechanical property.
The delayed bonding shear nail is good in structural universality, and can change the sizes of the nut 7 and the corresponding cylinder 3 according to the requirement of the pulling resistance, so that the structure of the delayed bonding shear nail can be used for a hogging moment area of a steel-concrete composite beam and can also be used for other steel-concrete composite mechanisms.
The aperture of the cylinder rod part is gradually reduced along the direction far away from the head of the cylinder, and the outer wall of the cylinder rod part is provided with concave and convex rib grains or corrugations. The design of the cone with a small lower part and a large upper part of the cylinder body 3 can effectively improve the anti-pulling performance of the shear nail. The concave convex rib grains enhance the binding force between the retarded adhesive shear nails and the concrete slab 9 after the retarded adhesive is cured. The cavity in the barrel 3 is tapered, the plastic outside the cone is provided with solid rib marks, and the taper, the rib marks and the nut provide pull-out resistance after the slow-adhesion adhesive 5 is cured.
The upper cover 4, the nut fixing plate 8 and the cylinder 3 can be made of high-density polyethylene, polypropylene and polyvinyl chloride materials through an injection molding process, and have high tensile yield strength and elongation at break. The components of the slow-bonding shear nail cylinder are easy to produce and process, mature in process technology, high in production efficiency, low in production cost and suitable for mass production. The slow-bonding shear nail sleeve has good sealing performance and convenient production and assembly, and can effectively solve the problems of flowing and dripping of the slow-bonding adhesive 5 during site construction.
The thickness of the end face, extending into the barrel body 3, of the stud welding nail 2 is smaller than the wall thickness of the barrel body 3, and the end face, extending into the barrel body 3, of the stud welding nail 2 is sunken towards the inside of the barrel body 3. The bottom of the cylinder body 3 is designed to be a thin wall, so that the stud welding nail 2 can conveniently puncture the bottom of the sleeve and can be screwed with the nut 7.
The embodiment of the utility model provides a second provides a steel-concrete composite beam includes steel construction 6, concrete slab 9 and a plurality of prestressing steel strand wires (not shown), each prestressing steel strand wires stretch-draw in concrete slab 9, steel construction 6 supports concrete slab 9, steel-concrete composite beam still includes foretell a plurality of slow bonding shear force nails, each slow bonding shear force nail welds on steel construction 6 and all pours in concrete slab 9.
The utility model also provides a construction method of reinforced concrete composite beam, including following step: s1, erecting a prefabricated steel structure 6; s2, welding stud welding nails 2 on the steel beam flanges 10, and installing slow-bonding shear nail sleeves 1; s3, brushing a release agent on the upper surface 11 of the steel beam flange, and pouring a concrete slab 9 on the steel structure 6; s4, when the concrete slab 9 reaches a certain strength, tensioning the hogging moment area prestress; and S5, finishing construction, and putting the steel-concrete composite beam into use after the slow-adhesion adhesive 5 is solidified.
After the steel beam is poured with concrete and the prestress tension requirement is met, prestress tension is carried out on the concrete, the stud welding nail 2 and the nut 7 can freely slide in the horizontal direction with the concrete, and prestress leading-in of the concrete is not affected.
The utility model provides a slow bonding shear force nail suitable for bridge or other building reinforced concrete integrated configuration negative moment interval and construction method thereof. As shown in figure 1, the utility model provides a slow bonding shear force nail comprises double-screw bolt welding nail 2, sleeve 1 two parts. The utility model provides a construction method mainly relates to the operation of girder steel flange plate, slowly bond the integrated configuration of shear force nail in the hogging moment district. The stud welding nail 2 is made of the same material and performance as the 'cylindrical head welding nail for arc stud welding', and the stud welding nail 2 is welded on a steel beam flange plate according to the design requirements of a drawing.
As shown in fig. 2, the sleeve 1 is composed of a cylinder body, a slow-release adhesive 5, an upper cover 4, a nut 7 and a nut fixing plate 8, wherein: the slow-release adhesive 5 is arranged in the sleeve 1, tightly seals and wraps the stud welding nail 2 after the stud welding nail is inserted, and tightly fills the sleeve 1. The slow-release adhesive 5 is a paste-like non-Newtonian fluid before the prestress tension construction is finished, the material form of the slow-release adhesive effectively ensures that no binding force exists between the shear nail and the concrete, but the slow-release adhesive has certain impact resistance and can fully resist and release tension force so as to ensure that the shear nail is not stressed during tension; after tensioning is finished, the slow-adhesion adhesive 5 is gradually cured along with the lapse of time (the curing time of the slow-adhesion adhesive 5 can be controlled by adjusting the formula of the slow-adhesion adhesive 5), so that effective combination is formed between the shear nails and the concrete, the functions of pulling resistance and shearing resistance are truly exerted, and the real combination stress of the steel plate and the concrete is realized.
The post-combined prestressed concrete bridge deck is only suitable for the structure of the prefabricated bridge deck, and has the defects of more blocks, more wet joints and poor integrity of the bridge deck. The utility model provides a slowly bond shear force nail can be used for the prefabricated construction, also can be used for cast-in-place structure, and when adopting cast-in-place construction, the wholeness is good, strong adaptability.
When prestress is applied to concrete, due to the fact that the EVA foam layer is arranged between the shear nails and the concrete, prestress cannot be transmitted to the steel beam through the shear nails, the degree of introduction of the prestress is guaranteed, after prestress tensioning is completed, the shear nails and the concrete are still in a separation state, the steel plate and the concrete cannot be combined to bear force, the section rigidity under the later-stage load effect is reduced, and the midspan bending moment is increased.
The utility model provides a slow bonding shear force nail adopts double-screw bolt welding nail 2 and nut 7 integrated configuration to replace common cylinder head welding nail, fixes nut 7 in sleeve 1, then encapsulates 5 in sleeve 1 of glue that will slow. During construction, the stud welding nail 2 is welded with the steel beam, and then the sleeve 1 packaged with the nut 7 and the slow-adhesion adhesive 5 is installed on the stud welding nail 2 through the nut 7, so that the structural mode avoids the problems of coating the slow-adhesion adhesive on the spot of the welding nail and leakage of the slow-adhesion adhesive. The sleeve 1 and the stud welding nail 2 can be relatively positioned, so that the problem of dislocation under the impact force of concrete pouring is avoided. The stud welding nail 2 is connected with the nut 7 through threads, and the nut 7 with the corresponding size can be designed according to different pulling resistance. The slow bonding shear nail provided by the patent is a connecting piece of a steel structure and a concrete slab, which has the advantages of reasonable construction type, outstanding stress performance, wide adaptability, convenient and flexible operation and excellent economical efficiency.
Compared with the prior art, the utility model provides a slow gluing adhesive 5 and sleeve 1's material attribute, and the utility model discloses the structural style of well slow bonding shear force nail has all effectively ensured to have established steel sheet and the real atress that makes up of concrete, has solved the problem that the hogging moment concrete prestressing force introduction degree of steel-concrete composite beam reduces.
The stress type of the slow-bonding shear nail is reasonable, the production and the manufacture are easy to realize in the manufacturing ring section, the manufacturing cost is low, the construction is convenient in the engineering application link, the arrangement is flexible, the construction quality is reliable, and the slow-bonding shear nail is a product which can be applied in engineering on a large scale.
The utility model provides a pair of in reinforced concrete composite beam, carry out the slow shear force nail that bonds that effectively combines with steel construction and concrete slab and construction method thereof. The utility model discloses can guarantee applying efficiency of hogging moment district prestressing force, also can guarantee the bulk rigidity of combination beam, improve the intensity utilization ratio, and possess good constructability.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A slow bonding shear nail is characterized in that: including sleeve and double-screw bolt welding nail, the sleeve includes barrel and upper cover, barrel and upper cover enclose the synthesis and accept the chamber, it has the viscose of delaying adhesion agent to accept the intracavity packing, the double-screw bolt welding nail include with steel construction welded weld part with stretch into the barrel in by the cladding portion of viscose adhesion agent cladding, the shutoff of cladding portion the barrel.
2. A slow bonding shear nail according to claim 1, wherein: the sleeve still includes the nut, nut fixed mounting is in the barrel, the stud welding nail include with steel construction welded screwhead and stretch into the barrel and the screw post of shutoff barrel, the screw post with nut threaded connection, the cladding of slow-adhesion agent the screw post.
3. A slow bonding shear nail according to claim 2, wherein: the barrel is T type structure, the barrel includes barrel head and barrel pole portion, the barrel head is equipped with annular nut mounting panel, the nut is located barrel head and fixed bearing in on the nut mounting panel.
4. A slow bonding shear nail according to claim 3, wherein: the aperture of the cylinder rod part is gradually reduced along the direction far away from the cylinder head.
5. A slow bonding shear nail according to claim 3, wherein: and the outer wall of the rod part of the cylinder body is provided with concave and convex rib grains or corrugations.
6. A slow bonding shear nail according to claim 3, wherein: the cylinder, the upper cover and the nut fixing plate are all injection molded parts of polyethylene, polypropylene or polyvinyl chloride.
7. A slow bonding shear nail according to claim 1, wherein: the upper cover is in threaded connection with the cylinder body, and the upper cover is located at the top of the cylinder body.
8. A slow bonding shear nail according to claim 1, wherein: the thickness of the end face, extending into by the stud welding nail, of the cylinder body is smaller than the wall thickness of the cylinder body, and the end face, extending into by the stud welding nail, of the cylinder body is sunken towards the inside of the cylinder body.
9. The utility model provides a steel concrete composite beam, includes steel construction, concrete slab and a plurality of prestressing force steel strand wires, each prestressing force steel strand wires stretch-draw in concrete slab, the steel construction supports concrete slab, its characterized in that: the steel-concrete composite beam further comprises a plurality of the slow-bonding shear pins according to any one of claims 1 to 8, wherein each slow-bonding shear pin is welded to a steel structure and is cast in a concrete slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020721992.8U CN212452289U (en) | 2020-05-06 | 2020-05-06 | Slow-bonding shear nail and steel-concrete composite beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020721992.8U CN212452289U (en) | 2020-05-06 | 2020-05-06 | Slow-bonding shear nail and steel-concrete composite beam |
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| Publication Number | Publication Date |
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| CN212452289U true CN212452289U (en) | 2021-02-02 |
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| CN202020721992.8U Active CN212452289U (en) | 2020-05-06 | 2020-05-06 | Slow-bonding shear nail and steel-concrete composite beam |
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