CN111691606A - Assembled double-hinged steel bar mechanical sleeve connecting joint - Google Patents
Assembled double-hinged steel bar mechanical sleeve connecting joint Download PDFInfo
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- CN111691606A CN111691606A CN202010663333.8A CN202010663333A CN111691606A CN 111691606 A CN111691606 A CN 111691606A CN 202010663333 A CN202010663333 A CN 202010663333A CN 111691606 A CN111691606 A CN 111691606A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 165
- 239000010959 steel Substances 0.000 title claims abstract description 165
- 238000010276 construction Methods 0.000 claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 8
- 210000001503 joint Anatomy 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 230000002787 reinforcement Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000011440 grout Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- 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
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Abstract
The invention discloses an assembled double-hinged steel bar mechanical sleeve connecting node, which is used for connecting a prefabricated part and a prefabricated part steel bar in the assembled building engineering industry; the steel bar fixing device comprises two hemispherical end steel bars, a first end part threaded steel bar, two outer sleeves, two inner sleeves, a double sleeve and a second end part threaded steel bar; the semi-spherical end steel bars are inserted from the threaded end of the outer sleeve and extend out of the truncated cone-shaped cross section of the outer sleeve, the semi-spherical ends of the semi-spherical end steel bars are clamped in the outer sleeve and are connected with the semi-spherical cross section, each semi-spherical end steel bar is connected with the outer sleeve in a single hinge mode, and the two semi-spherical ends are limited and restrained in a combined sleeve composed of the outer sleeve and the inner sleeve to form double hinges. The invention has two hemispherical end reinforcing steel bars to form a rotatable double hinge, thereby being easier to meet construction deviation, ensuring the safe stress of the node, simultaneously leading the operation to be simpler and solving the connection of the prefabricated part in the deviation range of the steel bar output butt joint construction.
Description
Technical Field
The invention relates to a mechanical sleeve connecting node, in particular to a novel assembly type double-hinged steel bar mechanical sleeve connecting node; belongs to the field of assembly type building construction.
Background
The requirements of technical regulations of prefabricated concrete structures are as follows: the superposed beams can be in butt joint connection, and the longitudinal steel bars at the lower parts of the beams are in mechanical connection, grouting sleeve connection and welding connection in the post-pouring section. The steel bar connection length required by mechanical connection is short, but the requirement of the mechanical connection on the manufacturing accuracy of the member is extremely high, and if deviation occurs, the later-stage deviation rectifying process is extremely complex; and by adopting welding connection, a heat affected zone is arranged near a welding seam, the material at the position becomes brittle, welding residual stress and residual strain are easy to generate, cracks are easy to expand, and the fracture is easy to break at low temperature.
Aiming at the problems, the prior art mainly adopts a grouting sleeve connection technology, the grouting sleeve connection needs to separate a grouting process of steel bar connection and concrete pouring of member connection, the construction process is extremely complicated, the precision requirement is high, the grouting sleeve is high in manufacturing cost, and the grouting sleeve is not suitable for large-area use. In the work progress, grout muffjoint appears about connecting reinforcement not on same straight line easily, great deviation appears. Meanwhile, due to construction errors, the upper cross section and the lower cross section of the joint of the components are not parallel, so that the upper connecting steel bar and the lower connecting steel bar are too long or too short.
Disclosure of Invention
Aiming at the defects of high precision requirement and high manufacturing cost of the mechanical sleeve connection mode, the invention provides the novel assembly type double-hinge steel bar mechanical sleeve connection node, which forms double hinges and has a large rotatable angle, can avoid construction errors caused by different straight lines of upper and lower connection steel bars and errors caused by overlong or overlong short steel bars to be connected, and can realize quick assembly of the node by adopting double sleeve connection.
In order to solve the technical problems, the invention adopts the following technical scheme:
an assembled double-hinged steel bar mechanical sleeve connecting node comprises two hemispherical end steel bars, a first end part threaded steel bar, two outer sleeves, two inner sleeves, a double sleeve and a second end part threaded steel bar; the first end part threaded steel bar and the second end part threaded steel bar are prefabricated steel bars to be connected, and hemispherical end steel bars, the first end part threaded steel bar, the outer sleeve and the inner sleeve are symmetrically arranged at two ends of the double sleeve; each hemispherical end steel bar comprises a steel bar section and a hemispherical end, the diameter of the section of the steel bar section is smaller than that of any section of the hemispherical end, and the end part of the steel bar section is provided with a hemispherical end steel bar thread; each outer sleeve is a cylinder with a through hole, and the through hole is formed by sequentially connecting a threaded end of the outer sleeve, a hemispherical section and a truncated cone-shaped section of the outer sleeve; the threaded end of the outer sleeve is internally provided with internal threads in the through hole, the diameter of the truncated cone-shaped section of the outer sleeve is gradually reduced from the outside to the inside of the through hole, the hemispherical section is connected with the end with the smallest diameter of the truncated cone-shaped section of the outer sleeve and the threaded end of the outer sleeve, and the hollow diameter of the threaded end of the outer sleeve is larger than the diameter of any section of the hemispherical section; the semi-spherical end steel bars are inserted from the threaded end of the outer sleeve and extend out of the truncated cone-shaped cross section of the outer sleeve, the semi-spherical ends of the semi-spherical end steel bars are clamped in the outer sleeve and connected with the semi-spherical cross section, each semi-spherical end steel bar is connected with the outer sleeve in a single hinge mode, and the two semi-spherical ends are limited and restrained in a combined sleeve formed by the outer sleeve and the inner sleeve to form double hinges; the semispherical end steel bar can rotate in the swing angle range of the outer sleeve circular truncated cone-shaped section, the swing angle theta is half of a conical angle formed by the outer sleeve circular truncated cone-shaped section, and the value of the swing angle theta is 2-20 degrees; the inner side threads of each inner sleeve are in threaded connection with the first end part threaded steel bar or the second end part threaded steel bar, and the outer side threads of the inner sleeves are in threaded connection with the threaded ends of the outer sleeves; the hemispherical end steel bar threads of the two hemispherical end steel bars are respectively in threaded connection with the first double-sleeve threaded end and the second double-sleeve threaded end of the double sleeve.
In order to further achieve the purpose of the invention, preferably, the threads of the steel bars at the hemispherical end, the steel bars with the threads at the first end and the steel bars with the threads at the second end are processed to meet the requirements of the acceptance criteria of construction quality of concrete structure engineering.
Preferably, the first double-sleeve threaded end, the second double-sleeve threaded end, the outer threads and the inner threads of the inner sleeve of the double-sleeve are processed to meet the requirements of mechanical connection technical code of reinforcing steel bars on the length of the threads of the sleeve and the distance between the threads.
Preferably, the threaded tap length of said first end-section threaded reinforcing bar is greater than the length of the first double-sleeve threaded end; the threaded tap length of the second end section of the threaded reinforcing bar is greater than the length of the threaded end of the second double sleeve.
Preferably, the maximum diameter of the hemispherical end is greater than the minimum circular cross-sectional diameter of the truncated cone-shaped cross-section of the outer sleeve and at least exceeds 6 mm.
Preferably, the threaded tap lengths of the first and second end-threaded bars are greater than the length of the inner sleeve.
Preferably, the truncated cone-shaped cross section of the outer sleeve is formed by machining a conical inclined plane through a lathe; the threaded end of the outer sleeve is formed by turning, milling, tapping, threading, grinding and whirlwind cutting; the hemispherical cross section is shaped by hot roll forming.
Preferably, the distance between the maximum circular section of the hemispherical end steel bar and the inner sleeve is 2-10 mm.
Preferably, the shortest distance between the first double-sleeve threaded end and the second double-sleeve threaded end of the double sleeve is called double-sleeve clearance, and the double-sleeve clearance is 2-30 mm.
Preferably, the double sleeve is of a cylindrical structure, and grooves are arranged at two cylindrical ends of the double sleeve.
Compared with the prior art, the invention has the beneficial effects that:
1. the assembled double-hinge steel bar mechanical sleeve connecting node is provided with two hemispherical end steel bars to form a rotatable double hinge, so that construction deviation is easily met, the safe stress of the node is ensured, the operation is simpler, and the problem of connection in a deviation range of prefabricated member steel bar outlet butt joint construction is solved.
2. The assembled double-hinged steel bar mechanical sleeve connecting joint can avoid the influence caused by overlong or overlong short upper-end threaded steel bars and lower-end threaded steel bars due to the fact that the upper cross section and the lower cross section of the connecting part of the component are not parallel by reserving the thread length of the steel bars at the hemispherical ends and the thread length of the double sleeves.
3. The construction cost of the assembled double-hinged steel bar mechanical sleeve connecting joint is low compared with the existing grouting sleeve connected by prefabricated parts, and meanwhile, the stress of a post-pouring section mode for steel bar lapping is more reliable, the application range is wider, the post-pouring area is less, and the industrialization degree is higher.
4. The invention connects the hemispherical end connecting steel bar and the steel bar with the thread at the lower end part through the double sleeves, and can realize the quick assembly of the node during construction.
Drawings
Fig. 1 is a schematic structural view of an assembled double-hinged steel bar mechanical sleeve connection node of the present invention.
Fig. 2 is a top view of the hemispherical-end rebar of fig. 1.
Fig. 3 is a cross-sectional view of the center line of the hemispherical-end rebar of fig. 2.
Fig. 4 is a schematic cross-sectional view of the first end portion of the rebar of fig. 1.
Fig. 5 is a schematic cross-sectional view of the second end-threaded rebar of fig. 1.
Fig. 6 is a top view of the outer sleeve of fig. 1.
Fig. 7 is a cross-sectional view of the centerline of the outer sleeve of fig. 6.
FIG. 8 is a top view of the inner sleeve of FIG. 1
Figure 9 is a centerline cross-sectional view of the inner sleeve of figure 8.
FIG. 10 is a top view of the dual sleeve of FIG. 1.
FIG. 11 is a centerline cross-sectional view of the dual sleeve of FIG. 10.
Fig. 12 is a schematic diagram of an application example of the fabricated double-twisted steel bar mechanical sleeve connection node of the present invention in a front view.
Fig. 13 is a schematic top view of an example of an application of the fabricated double-twisted steel mechanical sleeve connection node of the present invention.
The figures show that: the steel bar comprises a hemispherical end steel bar 1, a steel bar section 11, a hemispherical end 12, a hemispherical end steel bar thread 13, a first end part threaded steel bar 2, an outer sleeve 3, an outer sleeve circular truncated cone-shaped section 31, an outer sleeve threaded end 32, a hemispherical section 33, an inner sleeve 4, an outer thread 41, an inner thread 42, a double sleeve 5, a first double sleeve threaded end 51, a second double sleeve threaded end 52, a second end part threaded steel bar 6 and a precast beam 7.
Detailed Description
For a better understanding of the present invention, the present invention will be further described with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, an assembled double-hinged steel bar mechanical sleeve connection node comprises two hemispherical end steel bars 1, a first end threaded steel bar 2, two outer sleeves 3, two inner sleeves 4, a double sleeve 5 and a second end threaded steel bar 6; the first end part threaded steel bar 2 and the second end part threaded steel bar are prefabricated steel bars to be connected, and the two ends of the double sleeve 5 are symmetrically provided with a hemispherical end steel bar 1, the first end part threaded steel bar 2, an outer sleeve 3 and an inner sleeve 4; each hemispherical end steel bar 1 comprises a steel bar section 11 and a hemispherical end 12, the diameter of the section of the steel bar section 11 is smaller than that of any section of the hemispherical end 12, and a hemispherical end steel bar thread 13 is arranged at the end part of the steel bar section 11; each outer sleeve 3 is a cylinder with a through hole, and the through hole is formed by sequentially connecting a threaded end 32 of the outer sleeve, a hemispherical section 33 and a truncated cone-shaped section 31 of the outer sleeve; the threaded end 32 of the outer sleeve is internally provided with internal threads in the through hole, the diameter of the section of the truncated cone-shaped cross section 31 of the outer sleeve is gradually reduced from the outside to the inside of the through hole, the hemispherical section 33 is connected with the end with the smallest diameter of the truncated cone-shaped cross section 31 of the outer sleeve and the threaded end 32 of the outer sleeve, and the hollow diameter of the threaded end 32 of the outer sleeve is larger than the diameter of any section of the hemispherical section 33; the semi-spherical end steel bar 1 is inserted from the threaded end 32 of the outer sleeve and extends out of the truncated cone-shaped section 31 of the outer sleeve, the semi-spherical end 12 of the semi-spherical end steel bar 1 is clamped in the outer sleeve 3 and is connected with the semi-spherical section 33, the semi-spherical end steel bar 1 and the outer sleeve 3 form single-hinge connection, the semi-spherical end steel bar 1 can rotate in the range of the swing angle of the truncated cone-shaped section 31 of the outer sleeve, the swing angle theta is half of the conical angle formed by the truncated cone-shaped section 31 of the outer sleeve, and the value of the swing angle theta; the inside threads 42 of each inner sleeve 4 are threadedly connected to the first or second end threaded bars 2, 6, and the outside threads 41 of the inner sleeve 4 are threadedly connected to the outer sleeve threaded end 32; the hemispherical-end reinforcing thread 13 of the two hemispherical-end reinforcing bars 1 are respectively screwed with the first double-sleeve threaded end 51 and the second double-sleeve threaded end 52 of the double sleeve 5.
As shown in fig. 2 and 3, the diameter of the hemispherical head 12 is larger than the opening diameter of the truncated cone-shaped section of the 31 sleeve of the outer sleeve 3 and at least exceeds 6mm, so as to ensure that the hemispherical head 12 can be clamped on the conical inclined surface of the outer sleeve 3, cannot be pulled out and has enough strength to ensure the force transmission of the steel bar.
As shown in fig. 4 and 5, the length of the tapping portion of the first end portion of the steel bar 2 or the second end portion of the steel bar 6 is greater than that of the inner sleeve 3, so as to ensure the connection strength between the first end portion of the steel bar 2 or the second end portion of the steel bar 6 and the inner sleeve 3, respectively, and to ensure the force transmission between the steel bars.
As shown in fig. 6 and 7, the outer sleeve 3 is sized according to the diameter of the connecting bar, hot-rolled by a die to have a uniform wall thickness, and then machined with a tapered slope and a thread by a lathe. Wherein the outer sleeve circular truncated cone-shaped section 31 is formed by processing a conical inclined plane through a lathe; the outer sleeve threaded end 32 is typically formed by turning, milling, tapping, threading, grinding, lapping, and whirling; the hemispherical section 33 is shaped by hot roll forming.
As shown in fig. 8 and 9, the inner sleeve 4 is provided with connecting threads on both the outside and the inside, respectively an outside thread 41 and an inside thread 42; the external thread 41 is used for connecting the outer sleeve 3, and the internal thread 42 is used for connecting the end-part threaded steel bar 2, so that effective steel bar mechanical connection is ensured. The distance between the maximum circular section of the hemispherical end 12 of the hemispherical end steel bar and the inner sleeve is 2-10 mm.
As shown in fig. 10 and 11, the double sleeve 5 has a cylindrical structure, and one end of the double sleeve 5 is provided with a first double-sleeve threaded end 51, and the other end is provided with a second double-sleeve threaded end 52, which are respectively used for connecting the reinforcement segments 11 of the two hemispherical-end reinforcements 1. The shortest distance between the first double-sleeve threaded end 51 and the second double-sleeve threaded end 52 of the double sleeve is called a double-sleeve clearance, and the value range of the double-sleeve clearance is 2-30 mm. Preferably, the cylindrical ends of the double sleeve 5 are provided with bevels.
The processing of the hemispherical end reinforcing steel bar thread 13, the first end part threaded reinforcing steel bar 2 and the second end part threaded reinforcing steel bar 6 of the invention needs to meet the requirements of 'acceptance criteria for construction quality of concrete structure engineering'.
The first double-sleeve threaded end 51, the second double-sleeve threaded end 52, the outer-sleeve threaded end 32, the outer side threads 41 and the inner side threads 42 of the inner sleeve 4 of the double-sleeve 5 also need to meet the requirements of reinforcing steel bar mechanical connection technical rules on the length of the threads of the sleeve and the thread pitch; the strength of the end threaded steel bars and the double-sleeve connection is guaranteed, the force transmission between the steel bars is guaranteed due to sufficient strength, and meanwhile, according to the actual situation, the length of the thread tapping section of the hemispherical end steel bar is long, so that the influence of errors caused by the fact that the upper connecting steel bar and the lower connecting steel bar are too short due to construction is avoided.
The outer sleeve 3 of the invention has a truncated cone-shaped section 31, which can allow the hemispherical end steel bar to rotate around the hemispherical end 12 in the range of the swing angle at the truncated cone-shaped section 31. Hemisphere end reinforcing bar 1 passes through the inner skleeve and is connected on same straight line with outer sleeve and first end screwed reinforcement 2, and hemisphere end reinforcing bar 1 can be at the rotation of round platform shape cross-section 31 department in the swing angle within range, and rotatory hemisphere end reinforcing bar 1 is connected with second end screwed reinforcement 6 through double-sleeve, just so realizes carrying out the dislocation connection between first end screwed reinforcement 2 and the lower second end screwed reinforcement 6, just so can reduce the requirement of construction precision. The outer sleeve 3 of the invention provides a truncated cone cross section and a hemispherical cross section, so that the hemispherical end steel bar 1 can rotate at the contact part of the outer sleeve 3 and the hemispherical end 12 connecting steel bar to form a hinge, therefore, the assembled double-hinge steel bar mechanical sleeve connecting node of the invention has two hinges, and the existence of the double hinges enables the rotating angle of the connecting node of the invention to be larger, thus being capable of adapting to the malposition connection with larger error of the first end part threaded steel bar 2 or the second end part threaded steel bar 6.
The double sleeves can be used for quickly connecting the hemispherical end connecting steel bars, the first end part threaded steel bar 2 and the second end part threaded steel bar 6, and a novel combined type hemispherical rotatable steel bar mechanical sleeve connecting node can be quickly assembled on a construction site.
The assembling process of the assembled double-hinged steel bar mechanical sleeve connecting joint is as follows: the semispherical end steel bars at two ends are respectively inserted from the threaded end of the outer sleeve and extend out from the conical inclined plane end of the outer sleeve, so that the semispherical end steel bars are limited and restrained by the outer sleeve; the thread end parts of the semispherical end steel bars at the two ends are respectively connected with one end of the double sleeve through threads; the first end part threaded steel bar 2 and the second end part threaded steel bar 6 are respectively connected with corresponding inner sleeves through threads, and the inner sleeves are connected with the threaded ends of the outer sleeves through outer threads; two hemisphere end reinforcing bars 1 pass through screw thread and double sleeve threaded connection respectively, accomplish the integral connection.
Examples
The superposed beams can be in butt joint connection, longitudinal steel bars at the lower parts of the beams are in mechanical connection, grouting sleeve connection and welding connection in a post-pouring section, wherein the steel bar connection length required by the mechanical connection is short, but the mechanical connection has extremely high requirements on the manufacturing accuracy of components, and if deviation occurs, the later-stage deviation rectifying process is extremely complex; and by adopting welding connection, a heat affected zone is arranged near a welding seam, the material at the position becomes brittle, welding residual stress and residual strain are easy to generate, cracks are easy to expand, and the fracture is easy to break at low temperature. Aiming at the problems, the prior art mainly adopts a grouting sleeve connection technology, the grouting sleeve connection needs to separate a grouting process of steel bar connection and concrete pouring of member connection, the construction process is extremely complicated, the precision requirement is high, the grouting sleeve is high in manufacturing cost, and the grouting sleeve is not suitable for large-area use. In the work progress, grout muffjoint appears about connecting reinforcement not on same straight line easily, great deviation appears. Meanwhile, due to construction errors, the upper cross section and the lower cross section of the joint of the components are not parallel, so that the upper connecting steel bar and the lower connecting steel bar are too long or too short.
Aiming at the defects of high precision requirement and high manufacturing cost of the mechanical sleeve connection mode, the invention provides the assembled double-hinged steel bar mechanical sleeve connection node which can rotate within the range of the swing angle and has a large rotation angle, so that construction errors caused by the fact that upper and lower connection steel bars are not in the same straight line and errors caused by too long or too short steel bars to be connected can be avoided, and meanwhile, the double-sleeve connection can be adopted to realize rapid assembly of the node.
As shown in fig. 12 and 13, the precast beam 7 has an upper longitudinal rib and a lower longitudinal rib, the two upper longitudinal ribs are through-length longitudinal ribs inserted after hoisting, the lower longitudinal rib is a to-be-connected longitudinal rib of a cast-in-place part of the precast test piece, four to-be-connected longitudinal ribs are provided in fig. 12 and 13, two connecting nodes of the present invention are required to connect the two longitudinal ribs two by two, and meanwhile, the lower to-be-connected longitudinal rib is a tensile longitudinal rib of the precast beam 7 for bearing the bending moment applied to the test piece. And hoisting the two corresponding precast beams 7 to the designed designated positions on the project site, placing the steel bars of the precast beams 7 on the same axis, and starting assembling the nodes after positioning and rechecking without errors. As can be seen from fig. 1, during the assembly process, the hemispherical end reinforcing bars 1 at both ends are inserted from the threaded end 32 of the outer sleeve and extend out of the truncated cone-shaped section 31 of the outer sleeve, and the outer sleeve 3 restricts and restrains the hemispherical end reinforcing bars 1. The hemispherical end reinforcing steel threads 13 of the two-end hemispherical end reinforcing steel bar 1 are respectively screwed with the first double-sleeve threaded end 51 and the second double-sleeve threaded end 52 of the double sleeve 5. The first end threaded steel bar 2 and the second end threaded steel bar 6 are screwed with the corresponding inner side threads 42 of the inner sleeve 4 through threads respectively, and the inner sleeve 4 is connected with the outer sleeve threaded end 32 through the outer side threads 41, so that the assembly is completed, and the construction of the whole connecting node is completed.
The existing technology is mainly a grouting sleeve connection technology, the grouting sleeve connection needs to separate a grouting process of steel bar connection and concrete pouring of member connection, the construction process is extremely complicated, the precision requirement is high, the grouting sleeve is high in manufacturing cost, and the grouting sleeve is not suitable for large-area use. In the work progress, grout muffjoint appears about connecting reinforcement not on same straight line easily, great deviation appears. Meanwhile, due to construction errors, the upper cross section and the lower cross section of the joint of the components are not parallel, so that the upper connecting steel bar and the lower connecting steel bar are too long or too short.
In the assembled double-hinge steel bar mechanical sleeve connecting node, the hemispherical end 12 of the hemispherical end steel bar 1 is limited and restrained in the combined sleeve formed by the outer sleeve 3 and the inner sleeve 4, the two hemispherical ends 12 are limited and restrained in the combined sleeve formed by the outer sleeve and the inner sleeve through the combined action of the inner sleeve and the outer sleeve to form double hinges, each hemispherical end steel bar 1 can rotate in the range of the swing angle of the truncated cone-shaped section 31 of the outer sleeve, the swing angle theta is half of the conical angle formed by the truncated cone-shaped section 31 of the outer sleeve, the value of the swing angle theta is 2-20 degrees, and the rotatable angle is large. Through the combined action of the double sleeves, the movable range is large, the offset between the upper end part threaded steel bar 2 and the lower end part threaded steel bar 6 capable of accommodating the prefabricated test piece is large, the construction precision requirement is low, and meanwhile, the assembled double-hinged steel bar mechanical sleeve connecting node is simple in structure, low in node manufacturing cost, convenient to install and connect, capable of being quickly assembled during construction, capable of being popularized in a large range and obvious in advantages compared with grouting sleeve connection in the prior art.
The scope of the present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions and alterations can be made without departing from the basic technical concept of the present invention as described above.
Claims (10)
1. An assembled double-hinged steel bar mechanical sleeve connecting node is characterized by comprising two hemispherical end steel bars, a first end part threaded steel bar, two outer sleeves, two inner sleeves, a double sleeve and a second end part threaded steel bar; the first end part threaded steel bar and the second end part threaded steel bar are prefabricated steel bars to be connected, and hemispherical end steel bars, the first end part threaded steel bar, the outer sleeve and the inner sleeve are symmetrically arranged at two ends of the double sleeve; each hemispherical end steel bar comprises a steel bar section and a hemispherical end, the diameter of the section of the steel bar section is smaller than that of any section of the hemispherical end, and the end part of the steel bar section is provided with a hemispherical end steel bar thread; each outer sleeve is a cylinder with a through hole, and the through hole is formed by sequentially connecting a threaded end of the outer sleeve, a hemispherical section and a truncated cone-shaped section of the outer sleeve; the threaded end of the outer sleeve is internally provided with internal threads in the through hole, the diameter of the truncated cone-shaped section of the outer sleeve is gradually reduced from the outside to the inside of the through hole, the hemispherical section is connected with the end with the smallest diameter of the truncated cone-shaped section of the outer sleeve and the threaded end of the outer sleeve, and the hollow diameter of the threaded end of the outer sleeve is larger than the diameter of any section of the hemispherical section; the semi-spherical end steel bars are inserted from the threaded end of the outer sleeve and extend out of the truncated cone-shaped cross section of the outer sleeve, the semi-spherical ends of the semi-spherical end steel bars are clamped in the outer sleeve and connected with the semi-spherical cross section, each semi-spherical end steel bar is connected with the outer sleeve in a single hinge mode, and the two semi-spherical ends are limited and restrained in a combined sleeve formed by the outer sleeve and the inner sleeve to form double hinges; the semispherical end steel bar can rotate in the swing angle range of the outer sleeve circular truncated cone-shaped section, the swing angle theta is half of a conical angle formed by the outer sleeve circular truncated cone-shaped section, and the value of the swing angle theta is 2-20 degrees; the inner side threads of each inner sleeve are in threaded connection with the first end part threaded steel bar or the second end part threaded steel bar, and the outer side threads of the inner sleeves are in threaded connection with the threaded ends of the outer sleeves; the hemispherical end steel bar threads of the two hemispherical end steel bars are respectively in threaded connection with the first double-sleeve threaded end and the second double-sleeve threaded end of the double sleeve.
2. The fabricated double-hinged mechanical steel bar sleeve connection node as claimed in claim 1, wherein the threads of the steel bars at the hemispherical ends, the steel bars with the threads at the first end and the steel bars with the threads at the second end are processed to meet the requirements of the acceptance criteria of construction quality of concrete structural engineering.
3. The fabricated double-hinged mechanical rebar sleeve connection node as claimed in claim 1, wherein the first double-sleeve threaded end, the second double-sleeve threaded end, the outer threads and the inner threads of the inner sleeve of the double-sleeve are machined to meet requirements of length and thread pitch of threads of the sleeve in the technical Specification for mechanical rebar connection.
4. The fabricated double-knuckle mechanical sleeve joint of claim 1, wherein the first end-threaded reinforcing bar has a threaded tap length greater than the length of the first double-knuckle threaded end; the threaded tap length of the second end section of the threaded reinforcing bar is greater than the length of the threaded end of the second double sleeve.
5. The fabricated double-knuckle mechanical sleeve joint of claim 1, wherein the maximum diameter of the hemispherical end is greater than the minimum circular cross-sectional diameter of the frustroconical cross-section of the outer sleeve by at least 6 mm.
6. The fabricated double-knuckle mechanical sleeve joint of claim 1, wherein the threaded sections of the first end-section threaded steel bar and the second end-section threaded steel bar are longer than the length of the inner sleeve.
7. The fabricated double-hinged rebar mechanical sleeve connection node as claimed in claim 1, wherein the outer sleeve is formed by machining a conical bevel on a lathe; the threaded end of the outer sleeve is formed by turning, milling, tapping, threading, grinding and whirlwind cutting; the hemispherical cross section is shaped by hot roll forming.
8. The fabricated double-hinged mechanical rebar sleeve connection node as claimed in claim 1, wherein the distance between the maximum circular cross section of the hemispherical end of the hemispherical-end rebar and the inner sleeve is 2-10 mm.
9. The fabricated double-twisted steel mechanical sleeve connection node of claim 1, wherein the shortest distance between the first double-sleeve threaded end and the second double-sleeve threaded end of the double sleeve is called a double-sleeve gap, and the double-sleeve gap is 2-30 mm.
10. The fabricated double-hinged mechanical steel bar sleeve connection node of claim 1, wherein the double sleeve is a cylindrical structure, and both cylindrical ends of the double sleeve are provided with grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010663333.8A CN111691606A (en) | 2020-07-10 | 2020-07-10 | Assembled double-hinged steel bar mechanical sleeve connecting joint |
Applications Claiming Priority (1)
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Cited By (2)
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| CN113914550A (en) * | 2021-10-18 | 2022-01-11 | 华南理工大学建筑设计研究院有限公司 | Flexible connection node of non-collinear reinforcing steel bar mechanical sleeve |
| CN115217273A (en) * | 2022-05-31 | 2022-10-21 | 中国建筑材料科学研究总院有限公司 | Reinforcement material and device for 3D printing of structures among concrete layers and construction method |
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